Implementation of the Final Solution Research Paper

Implementation of the Final Solution - Research Paper Example The uniqueness of the Holocaust lies in its motivation - in the fact that for Nazi regime the removal of the Jews was a sine qua non of the survival of mankind, a matter of global, if not cosmic, importance, and not an ordinary political matter.2 The Final Solution and the Holocaust were unique genocides of the Jewish people, unique for its magnitude and the "rationality" of their processes. To achieve its goals of Jews' elimination, the Final Solution "rationally" targeted nation's most vulnerable and vital members - women and children. On 20 January 1942, Chaired by Reinhard Heydrich, the Wannsee Conference played host to nine high-ranking officials, five senior SS chiefs, and local party bureaucrats from across the Third Reich. Serving as the chief dignitary and ranking member of the SS, Heydrich explained that "in view of the extreme importance of the subject, a consensus of opinion is reached regarding the "'Final Solution.'"3 From the historical perspective, there is an ongoing historical debate as to when the decision was made for the "Final Solution." Many historians argue that when Hitler made his "prophecy" speech of January 30th, 1939, he had already decided on the "Final Solution." Christian Gerlach has argued for a different timeframe, however, suggesting the decision was made by Hitler on December 12, 1941, when he addressed a meeting of the Nazi Party and of regional party leaders.4 In addition, Gerlach argued that Hitler had not decided on what the true "Final Solution" was until the euphoria of vict ory swept over the German leadership in the summer of 1942 in the wake of the anticipated victory over Russia. Historians on the Holocaust largely agree that the policies and strategies of the Final Solution has been prepared and practically tested some time before the year 1942. They took the form of deportations, ghettos, and euthanasia programs. Although the deportations and the ghettos can be called murderous solutions in their own right, they were not the Final Solution. The ghettos themselves were just temporary holding pens until a more "permanent solution" was developed. The development of the "permanent solution" started with the Einsatzgruppen. The Einsatzgruppen were squads composed primarily of German SS and police personnel. Under the command of the German Security Police (Sicherheitspolizei or Sipo) and Security Service (Sicherheitsdienst or SD) officers, the Einsatzgruppen had among their primary objectives the elimination of those considered to be racial or political enemies found the occupied zones, Soviet Union territories particularly. These victims included Jews, Roma (Gyp sies), and officials of the Soviet state and the Soviet Communist party. The Einsatzgruppen also murdered thousands of residents of institutions for the mentally and physically disabled. Many scholars believe that the systematic killing of Jews in the occupied Soviet Union by Einsatzgruppen and Order Police (Ordnungspolizei) battalions was the first step of the "Final Solution," the Nazi program to murder all European Jews. However, some scholars such as Dina Port contend that the Final

Kite Runner Essay Example for Free

Kite Runner Essay Hassan Amirs best childhood friend. He was often bullied by Assef and his followers Kamal and Wali. He was Alis son even though later in the novel, it is revealed that he is truly the son of Baba and Amirs brother. Late in the book, they allow us to know by saying that there is a special closeness that people who fed from the same breasts share. He was poorly educated and stood up for what he believed in, even if it meant dying for it. He always stood up for Amir no matter what the consequence, even if its him being raped. In the end of the novel, he does get shot for not giving up Amirs property after he had moved to America. Amir The main character who is the son of Baba. His mother died during childbirth. He always holds himself responsible and wonders what things would be like if his mother had not died. He has always looked up to Baba and wondered why Baba is so distant with his emotions. He befriended Hassan as a child and they became inseparable. He was educated and read to Hassan often but every so often he did become a victim of peer pressure and bullied Hassan even though Hassan would always stand up for him. Assef The bully in Amir and Hassans childhood story. He thought he was better than them both and always referred to Hassan as a Hazara, and wonders why Amir hangs out with him. Amir is a Pashtun which are referred to as the Real Afghans He later grew up to be a part of the extremist group called the Taliban and tried to control the people of Afghanistan. He ruled a trafficking system that Amir later saved a child from. Baba Amirs father who only wanted a better life for his son. Baba always tried to make Amir stand up for himself and tried to make his son be more like him. Baba is a very noble and well respected man, is not able to connect, nor understand his twelve year old son, Amir. This lack of understanding, leads to Baba not being able to satisfy the needs of Amir, as a father should. Baba is very renowned for being a rich but generous man in Kabul. With his wealth he does great things, he built an orphanage and often gives money to the poor, for this most people respect him. Baba is definitely an admirable man in most of his actions but he has some flaws just like everyone else does. One of Babas faults is his fathering skills, which he has little of, if any. As a single parent Baba tries to connect with Amir, but struggles deeply to find any common interests as they are very different people. He treated Ali as a brother and Hassan as a son (even though Hassan was his other son). He was intelligent and supported Amir. Amir and Baba were very close as father and son and had a strong bond that even in later life did not break. Rahim Khan He is Babas close friend and partner in business. He is also a mentor to Amir as he is growing up. Rahim Khan is constantly being a good listener for Amir and always asks to read Amirs stories. Rahim is a good man, and is always the voice of reason. After Amir leaves for America, he still wants Amir to be the man that Baba dreamed of him being. Soraya- is Amirs wife and because she is a woman in an Afghan society, her social status is significantly lower than a mans. She has a rather scandalous past that is talked about as gossip, but she points out that it would be different if she were a man in the same society. She stays the obedient daughter to her father for most of the novel even though their opinions clash sometimes. For example, she reads Amirs story even though her father forbids it. She wants to stand up to her father at the end of the novel when he worrys about what people will think when they find out she is living with a Hazara child. Instead of letting her stand up to her father, Amir stands up for his nephew and does it himself. Soraya is a character to represent the status of woman in a normal Afghan society which is a very low social status. Summary Amir is a young traditional Afghanistan boy that lives in Kabul. As child he is a kite runner with his friend Hassan who is also his servant. His father Baba dreams of a bigger and better life outside of Kabul. They soon leave for America and after leaving, Amit meets his bride to be Soraya (who was also from Afghanistan). They marry and live happily but Baba passes away. Amir gets an unexpected call from Rahim Khan telling him to come back and he is told that Hassan was shot by the Taliban and that he was Amirs brother and he had a son named Sohrab. Amir then goes to find his nephew but realized the Taliban has taken him into a trafficking system. Amir goes to save him and discovers that Assef is the one who had taken him. He then rescues Sohrab and takes him back to America to live without fear.

Energy Resources and Environmental Impact :: Economy Economics Essays

Energy Resources and Environmental Impact We have in our possession, a variety of energy resources that can be used to replace, some of the more harmful fuels utilized today. Nevertheless, even with all these options we have yet to make a certified effort in the upgrading of our current systems of energy production. Of course this in many ways is tied to politics and economic issues. Yet it is my passionate belief that these should not over power that which is ultimately more important which is the welfare of the environment. Why so much interest in the subject you might ask? Well in truth it stems from the recent class we had on geothermal energy. Out of all the processes we’ve covered so far this one interested me the most. However, when discussed in the classroom I felt that only the positive aspects of the procedure were highlighted. Although a beneficiary way of energy production, I was curious to see it repercussions. Because no system is perfect, this one should be no different, on top of that there had to be a reason why it isn’t as popular as it should be given its efficiency. As the world's largest energy resource, geothermal energy can be inexhaustible. The resource is constantly replenished by circulating ground waters, therefore if the fluids are extracted at a sustainable rate, the resource will be available for future generations.Geothermal energy is probably one of the safest and most reliable sources of energy, outside solar energy. It is reliable (the source of heat, the Earth itself, is relatively constant), and hazard, in terms of unwanted waste products or catastrophic accidents, is nonexiste nt. There are atmospheric emissions from geothermal power plants which are predominantly CO2 and H2S. However, in the context of global climate change, geothermal has significantly lower CO2 emissions than fossil fuels. Atmospheric emissions from geothermal plants average only about 5% of the emissions from equivalent generation sized fossil fuel power plants. The actual land use for geothermal energy production is relatively small for both the fuel acquisition and the energy production. The common practice of re-injecting spent geothermal fluids means the impacts on aquatic life have been eliminated. Geothermal plants also co-exist successfully with other land uses. Adverse environmental impacts of geothermal development may include land subsidence and increased microseismic activity. However such adverse factors need to be balanced against the more obvious advantages of geothermal over fossil fuels.

New Zealands Agriculture Essay -- Climate Environment New Zealand Ess

It is safe to say that New Zealand is largely a farming nation since farming makes up a high percentage of the country's export earnings. The country's climate ranges from regions in the north that are considered "warm subtropical", to "cool and temperate" in the south. These diverse areas allow for numerous kinds of farming which are vital to New Zealand's economy. All over the country there are deer, llama, ostrich, goat, cattle and sheep farms, and though they get no subsidies from the government, they still play a large part in contributing to overseas markets with their beef, wool, dairy products, other meats, hides, venison (from deer), and goat fiber. It is said that there are about 20 times as many sheep as there are people in New Zealand, but since the country has become increasingly more developed in recent years, this figure has dwindled and continues to do so. This is not to say that the development of human civilization in New Zealand is the preeminent concern for threat ening the country’s animal farming industries. In fact, climate change is a greater concern, and if global temperatures continue to rise as they have been over the years, New Zealand ’s animal farms could take a hit. Animal farms aren’t the only widespread economy drivers in New Zealand. In addition to animal farms, New Zealand is also rich with tree farms. This way they can harvest trees for lumber without touching the indigenous forests, most of which are protected indefinitely, like the huge rainforest on the western side of the south island. 30 percent of New Zealand is covered in forest, including both natural and "planted production" forests. This is a large and seemingly healthy percentage relative to most other countries in the world. Sin... ...oxide in the air might actually assist the overall growth of some vegetation. Whether the positive aspects of a warmer climate will prevail over the negative aspects remains to be seen, but it will certainly have an impact on agriculture in New Zealand and elsewhere. Humans have never been in this situation before so it will be something that we surely will find out in the future unless something is done to regulate the amount of greenhouse gases that are emitted into the atmosphere. Bibliography Jebson, Mike. â€Å"Climate Change and Agriculture and Forestry: Impact on Industries† http://www.maf.govt.nz/mafnet/rural-nz/sustainable-resource-use/climate/impact-on industries.html Jebson, Mike. â€Å"Climate Change and Agriculture and Forestry: Issues and Responses† http://www.maf.govt.nz/mafnet/rural-nz/sustainable-resource-use/climate/issues-and-responses.html

Step by Wicked Step

STEP BY WICKED STEP Themes  ~ Step By Wicked Step Family relationships Coping with new family members for example Pixie understands that her new stepmother is having as much trouble ‘adjusting’ as she is. Family unity The nucleus of moral values, â€Å"the family unit,† is being invaded by outsiders (‘step’ or ‘steps’) and this causes disharmony. Dealing with adversities Young children and adults may find difficulties dealing with frustrations, fears and sadness. Being happy ‘Life has dealt us one hard blow, there is no reason for us to be unhappy for ever’. For example, Claudia realises it is not fair to hate her new stepmother, Stella.Think long enough before making a decision Richard Harwick made a rash decision to run away and that had changed the lives of his stepfather, mother and sister. Sibling rivalry Resentful step-siblings cause burden and hostility in a home. Coping with change All pain eventually heals and that we have the power to change things for the better. Being brave Characters like Claudia and Pixie are brave as they confess to their own rotten behaviour. Dealing with Separation and Divorce It deals with a social phenomenon that many people are experiencing, the idea of a divorce as somehow horrible.Separation and divorce, and the events leading up to them, interrupts the stability and predictability that children need. STEP BY WICKED STEP Synopsis By Chapter  ~ Step By Wicked Step Chapter 1- Chapter 7 Step By Wicked Step – Chapter 1 It is raining. Mr. Plumley and five pupil from Stagfire School are going to a haunted   house in a minibus. Ralpha, Claudia, Robbo, Collin and Pixie have been picked out by Miss O’Dell and herded into the minibus with Mr. Plumley. When they reach Creepsville, they think it is haunted. The last group tells tales of strange shadows and  footsteps and eerie figures in white gown   melting through the walls.There are no lights and Mr. Plumley is horrified to settle the pupils in pitch dark. They  go upstairs as they pass by oil painted portraits of Harwicks of all ages staring at them. As it is a rainy night, Pixie preferred safety in numbers. They have a rule â€Å"each bedroom is for either girls or boys. † Mr. Plumley does not know the rule. He tells the pupils to settle in while   he goes to look for the housekeeper. Robbo decides to explore two or three more stairs. He finds two more beds and a bathroom. The boys take the present room meanwhile Claudia and Pixie take the other. Colin points at the wall. He insists there is a door on the wall.When there is lightning, all of them see the wall papered door meeting the wall papered wall. As they enter the room, cobwebs indicate no one has been there. A tower off a tower. The shelf, desk and chair are filled with dust. Claudia sees a wooden cow balancing on   three legs. She strokes its nose. Suddenly, she hears a soft sound behind her. Robbo sets a globe of the world to spin on its axis. By looking around, they came to a conclusion that the last child who slept in it came from a rich family. They find out it is a boy’s room. Claudia notices a dusty green album in spidery writing on the cover. Richard Clayton Harwick – My Story.Read  and Weep. They hear the faint rumble of the bus. The other children have arrived. The 5 children rush to their rooms and pretend to be fast asleep. They do not want to miss the chance to read the album. Not many get a chance to peep   into someone else’s life and not many people are brave enough to tell you their story. By the time Miss O’Dell and Mr. Plumley come to the first tower room, they think that the children are fast asleep due to tiredness. Miss O’Dell continues to say that the five children have something in common. Mr. Plumley is puzzled as nothing seemed to be common in the five. Pixie is a trouble maker.Claudia is sensible. Ralph is quick-witted and hardworking unlike Colin who likes to   daydream. Robbo is soccer-mad. As Miss O’Dell goes down, the lights come again. She shuts the tower door leaving the five children who have been listening to their conversation. Step By Wicked Step – Chapter 2 The five children are waiting in an old house for the rest of their school group to arrive. They come across an old manuscript written by a boy who ran away when his mother remarried after his father’s death. Richard’s Story- Master Richard’s father had a fever. His mother tried her best to coax his father to eat something- but it was of no use.Richard asked George the gardener about his father. Richard calls him Mr Digby. Mr Digby did not answer him but hugged him hard instead. Lucy the maid sat by Richard’s bedside. When Richard asked if it was going to be today,she placed her finger on his lips and said â€Å"Hush! Don’t even speak of it. Little Charlotte called out to Richard a nd told him that Papa wanted to see him. He dashed as fast as he could. He came across Reverend Coldstone but did not stop although he was asked to. The reverend was angry. His mother was waiting at the doorway and reminded him not to cry.His father asked him to be good to his mother and sister. His last words were –â€Å"Obey your mother’s wishes to the letter. At the chapel, Mr. Coldstone consoled his mother. Richard heard him say -â€Å"When you are mine†¦Ã¢â‚¬ . Richard studied at Mordanger school. He hated it there. Now he was home. Charlotte realized that Richard hated his stepfather. Richard accuses that Charlotte had forgotten about their father. Charlotte denied it and advised him not to accuse Mr Coldstone as the murderer when their father died of fever. Nevertheless, Richard had decided to leave the three of them. Richard wrote in his diary that he worked in a ship.Whenever he wrote about Mr Coldstone, he refered to him as the ‘black batâ€℠¢. Twice his ship stopped at his hometown and he visited his home only to stand like a trespasser. It had been a long time since Richard had been home. Suddenly, he saw a note on the Captain’s table. He found out that his mother and stepfather had died. Charlotte wrote him a letter. In the letter, Charlotte wrote that things had been difficult as their mother spent a lot of money looking for him and they all suffered Mr Coldstone’s anger. Charlotte married Charles Devere although she did not love him because he had money and was willing to spend it to look for Richard.This would be the only letter from her. Step By Wicked Step – Chapter 3 Claudia’s Story: Green Pyjamas Claudia’s Mum and Dad quarreled a lot. One day, her Dad was gone to Granny’s house. However, he dropped by for tea. Claudia overheard the name â€Å"Stella†. Her Mum and even Granny had a row with Dad. Dad usually met Claudia at Granny’s. She missed her Dad so mu ch. The times spent with her Dad kept flooding back. She wanted things back the way they used to be. For the first time, Claudia had a separate Christmas. Later, she was introduced to Stella who was just plain and mousy. Claudia thought her mum was a whole lot better-looking than Stella.Claudia was rude when they went for a walk. Once back, they quarreled and the next day, Dad moved out of Granny’s house straight into with Stella. Claudia met her Dad off and on. Stella stayed out of it. She only made some light conversation with Claudia like asking about her friends and school. Those moments she would be thinking of her mum doing the house chores. After talking to her friend, Shreela, Claudia stopped blaming Stella. Dad and Stella arranged a party for their friends. Claudia was sent there for the day. Politely, she excused herself from the party and stayed in her room. Stella was relieved.Out of curiosity, Claudia decided to eavesdrop. She wore the green pyjamas given by Stel la as it was the exact shade of green of the giant fern. She sat beside the fern and listen to everything the adults downstairs were talking. The guests spoke about everything except about Mum, Dad, Stella or Claudia. Nobody praised Stella for the food nor even spoke to her. Claudia found that very rude as her Mum was not there. Claudia, unable to stand the treatment Stella was getting, made a grand appearance at the party and thanked Stella for the beautiful pyjamas she had brought for her. Finally, everyone started noticing Stella.As for Claudia and Stella, this was the starting point. Stella would teach Claudia how to quilt, read maps, change electric plugs and how to skate. Step By Wicked Step – Chapter 4 Colin describes his stepfather whom he calls dad. He has thought of him as his biological father all the while. His dad looks like him. His dad has dark hair with some grey patches around his ears. His dad used to roll his own cigarettes out of tobacco in a tin. His dad calls him by many nick names- Col, Collie, Sonny-boy, Buster, Mr Bluebird. Colin’s mum works in a shop. His dad walks him to school and back.His dad got him his tea and took him to the park. At the park, he used to swing as high as the bar, he swings back in such a way that his dad would call him –The Bluebird of Happiness. Then, Colin’s mum took him and moved away. It happened when Colin’s father had gone to spend a day with his sister. Two friends of his mum came with a van and packed everything. Then they went off. At first, he thought his dad will join them later. Colin was not happy- school mates would snigger when he did not understand things. Mum found a job at a canteen. She would be busy doing household chores when she came home.Mum was too busy to listen to him. He compared her with his dad- his dad used to talk to him and remembered names of his friends and teachers. Colin asked his mother many times about his dad. He wanted to know when his da d will come home. His mother did give him a hint about his father not having a proper job. He realized later that his mother did not leave any clues for his dad to follow. He then wrote a letter to his dad. But there was no reply. Every night, Colin would take the tobacco tin out of the toe of his boot and put it under his pillow. Then, he would hum his favourite song which was also his dad’s favourite.He would stay awake for hours talking to his dad. He pretended that his dad was there. Colin said that it was as if his mother thought that whatever is happening is actually happening only to her. Then one day when he returned home from school, he realized that his mum had thrown away his boots. The boots were too small for him but she did not know that there was a tobacco tin hidden in there. He did not bother to tell her because she wouldn’t have liked it. It has been five years, eight months and seven days and Colin still remembers hit dad. He secretly writes his dadà ¢â‚¬â„¢s name and his old address on the forms at school.Colin also tries to save money- he does three paper rounds. He will not try to look for his dad now- perhaps someday when he has enough money. Colin hums slowly and when asked to sing, he says that he is saving the words till he finds his dad. It was his favourite song- The Bluebird of Happiness. His friend Ralph consoled him by saying that someday Colin will find his dad. Step By Wicked Step – Chapter 5 Ralph’s Story: A Tale of Three Stepmothers Ralph has two brothers, two half-brothers, one half-sister, three stepbrothers, one stepsister,three stepmothers, one stepfather, two step-grandmothers and a step-grandfather.Living in a big family is no joke. After school on Mondays and Thursdays, he goes directly to Dad’s place. His mum or his step dad, Howard sends him. On Tuesdays, Wednesdays and Fridays, he goes straight to his Mum’s place. At times, he will be lost not knowing where to go. The lunchbo xes help. M for Mickey Mouse and Mum, D for Dumbo and Dad. If he is lost, he has to look at his lunch box to confirm his destination. Edward and George are his brothers. The boys liked Annabel, stepmother No. 1. The only problem was she never left the boys alone with their dad. Edward and George hated this.Dad and Annabel spent all their time kissing and cuddling. Annabel was always on a diet. She disapproved of coffee. So the boys had to drink Dandelion tea every morning. She loved to read out her star sign forecast in the mornings and again in the evenings. Sometimes, she even tried to look at Edward and George to tell their aura. However, the boys would deny anything she said. Yet, their dad would not feel embarrassed. One day, Brandy, Ralph’s cat was sent over as their Mum was varnishing the hall. The three boys took Brandy in a cage. Edward had made it from a broken milk bottle crate and bits of wire.Annabel was annoyed and blamed them to be cruel as Brandy did not have room to breathe. Dad distracted her by pointing out that they were out of bread. Annabel insisted in baking. The poor boys were starving to death. So, they went to the shops. They boys ate three large loaves and before they came home, they brushed away the crumbs. Dad was praising of how the dough had risen. When Annabel left it on the table, Brandy leapt up on the table and sniffed the dough. Then, Brandy lifted its paw and patted the dough. Next, Brandy curled himself comfortably into the dough. Annabel went mad. Dad tried to stick up for Brandy.The spell between Annabel and Dad was broken. In the end, Annabel ran off with someone and Dad searched high and low to get the divorce papers signed. The boys did not miss her as she was more of dad’s girlfriend than a real stepmother. Dad then focused his attention on Janet, who was more keen on rules. However, Dad liked it. Edward and George did not mind as they were able to spend ample time with Dad. On the other hand, Janet was busy rushing her children to the doctors, dentist and school. Janet’s own children, Tom, Joe and Doug and Ann moved in with the three boys. Tom and Ann could get along with Ralph but not Joe and Doug.Mum and Howard though Janet was wonderful. Janet could draw up proper schedule and Mum hardly bothered as she found Janet was easy to deal with. Due to the rules, Ralph knew he could pick up rules in no time if he was ever anywhere. Finally Janet left. She got fed up with Mum and Dad as they were taking advantage of her. Dad kept fixing up work trips on the days the boys were there. He told Janet that she had four children and another three would not make any difference. Mum started sneaking Victor’s romper suit hoping that Janet would come across them and get the stains out before sending them back. So, Janet left.The boys had a wonderful time after that. Unfortunately, it was only for a short period of time. Stepmother Number 3, Flora, came into the picture. Edward met her lying on Dad’s patio with hardly any clothes on. She had the cheek to tell Edward to cover up as she was enjoying the sun. George met Flora when they went shopping. Flora was dumping treats like strawberries, kiwi fruits, waffles, Belgian chocolates into the trolley. Dad was looking into the wallet, gloomily. Ralph went the next day. When he rang the bell, Flora opened and enquired. Ralph introduced himself. Flora blew her top as she did want to be a nanny.She took Ralph out for a Chinese Dinner and to watch a film. Then she met some friends and went to a coffee bar. At that time, Ralph informed his Dad of their whereabouts. Dad was furious and scolded Flora. Flora was cool and told him not to dump the children on her before checking her schedule. Ralph thought she was wonderful although she did all sorts of terrible things to him. Flora was pregnant and she ate only mint sauce sandwiches. Ralph was worried that his half sister or half brother would not be well taken care off by Flora. She did not know how and Ralph decided to help her out.The others usually teased Ralph. Most probably, Flora would settle in with this family. Step By Wicked Step -Chapter 6 When Pixie's parents divorced, Pixie was allowed to spend two weekends a month at her father's house which he had bought together with Lucy, her stepmother. Her two step sisters , Sophie and Hetty Payne, shared a room while Pixie was given a room to herself, as was agreed by her father. Pixie could not get along well withe her stepsisters and their actions annoyed her. One day, bothe her stepsisters got onvolved in a fight , and this caused Hetty to move into Pixie's room.Pixie was dissapointed as she was not consulted on the matter, and to make the matter worse, her father ingnored her complaints about Hetty moving into her room. Hetty's irritating behaviour also put Pixie's off. One day, while on a family holiday, Pixie had a fight with Sophie over who should occupy the top bunk bed , and both o f them ended up crying. As for Hettym Pixie just could not stand her even though Hetty was closer to her in age. Pixie was also jealous of Hetty as she was everyone's darling due to her good manners and intelligence in mathematics. Pixie then divised aplan to force Hetty out from her room.Intially, she tried to frighten Hetty with ghost story and also burden Hetty with schoolwork so that Hettty would be fed up with her and voluntarily leave her room. However, those trick was failed. Hetty than complained to Lucy. Lucy tried to talk to Pixie but failed. Instead, the two of them end up arguing. Pixie's father appeared then but quickly went out of the room again as he did not want to interfere. Lucy was dissapointed with Pixie for not putting with any effort to integrate and mix with the family. Pixie was dissapointed that there was nothing for her at Lucy's home.After expressing their frustrations and dissapointments, both Lucy and Pixie cried and the made up. Pixie was able to tolera te her stepsisters and Hetty help her with her homework. She also tried to be more sociable at Lucy's home. Step By Wicked Step – Chapter 7 Robbo's parents spilt up when he was only six years old. Robbo's father then moved out from their house and Robbo and his sister, Callie visited him at his place regularly. Robbo's stepfather, Roy moved to their home but Callie disliked him. She also nicknamed him as ‘The Beard' as Roy seemed to interfere with their family affairs.Their mother tthen give a birth to Dumpa, Robbo's half brother. One day, when Roy and their mather had a row, Callie tried to get their parents back together but failed. One day, Robbo's mother had a serious row with Roy over Callie's habit of pushing her bicycle through the narrow space between his car and the bushes beside it as it almost stratched Roy's car. They started shouting each other . Roy was angry as he felt his wife siding with Callie and that neither of them appreciated his effort in sending the kids to school or paying for food. Robbo's mother and Roy's efforts to solve the problem but they ended up arguing. he situation worsen whern Roy decided no to drive callie to school and sledging activities when snow started to fall. He even refused to buy her favourite brand of cerelas as she was not polite and civil to him. The next day, roy decide to clear the shed during the middle of a heavy snowfall with Dumoa following him. Robbo's mother tried to get Dumpa in, but he refused and only listened to Roy. Robbo then suceed in coaxing Dumpa into the house by offering him strawberry rocket ice lolly. From that day onward, their mother was always stuck in the middle as both Callie and Roy were unhappy and upset with each other.She also realised that the only solution to the problem is for her to move out her father's place. Robbo's father then suggested to his ex-wife to go on a holiday with Roy to help them solving the problem. He even offering to take care of Dumpa while there were away. The story ended with Robbo's optimistic view of his family as they can now start afresh. Ralph compared Robbo's story to Richard Harwick's story because his sister, Callie and Richared both did not like their stepfathers and had to leave their family. However, unlike Richard who ran away from his family, Callie tried something different in order to make things work at home.Ralph also mentioned that everyone in their group had tried their best to solve their problems at home. Claudia then put the journal back into its place, but took out Charlotte's little wooden cow, removed a tiny splinter, and gave the little wooden cow to Ralph who thrust it into Collin's bag , hoping that Colin would find his stepfather again. STEP BY WICKED STEP Characters and characterisation  ~ Step By Wicked Step Name of character| Descriptions/ Attributes/ Personality| Robbo| School pupil, sports-mad especially football|Ralph| School pupil, quick-witted, hardworking and occasionally likes to i ntercept impolitely during a conversation| Colin| School pupil, longs to be reunited with his stepdad, dreamy as ‘he drifts through the hours of each school day as if his thoughts were hundreds of miles away’ and this ‘ drove his teachers to despair’| Claudia| Steady, sensible, did not get along well with her stepmother at the beginning| Pixie| Fiery, a good reader, selfish| Richard ClaytonHarwick| Owner of Old Harwick Hall, lost his father at a very young age. His mother remarries the priest, Reverend Coldstone whose wrath Richard cannot stand.He runs away, without knowing that he has made a decision that will change three lives; his stepfather’s, mother’s and sister’s. When he inherits Old Harwick Hall, he has lost his three closest members of the family. | Rev. Coldstone| Richard’s wicked stepfather, strict and cold-hearted| Mr. Plumley| A staff of the school who accompanies the children to Old Harwick Hall| Miss O’ Del l| The school teacher who picks five of the children on a trip after a quick glance at her list. | Mr. Digby| Gardener at the Harwick’s household| Lucy| Maid at the Harwick’s household|Charlotte| Richard Clayton Harwick’s sister. | STEP BY WICKED STEP Moral Values  ~ Step By Wicked Step Family is everything This is the main message in all the five stories from Claudia, Ralph, Colin, Pixie and Robbo. Love is the factor that binds the family together but sometimes the family unit breaks down due to a lack of understanding between parents. Most of the time, children are not prepared for such a situation and this lands them in an awkward and painful situation. It is important to minimize the impact of divorce on children and to make sure they do not feel unwanted or unimportant.Parents must always try to keep the family together despite the breakdown in their relationship. Patience is a virtue It is important to practice a lot of patience in difficult times. No pa rents would want a divorce if they can help it. Hence, everyone affected by a divorce must be patient and tolerant. Richard Clayton Harwick does not show enough patience when he leaves his family because he cannot get along with his step father. As a result of his action, his mother dies of heartbreak and his sister blames him for being selfish and cruel. In Pixie’s story, she does not show much patience towards her step siblings.She refuses to share her bedroom with Hetty. She is also hard headed and argues intensely with her step mother. We must learn to adapt to new situations Children from broken homes have no choice but to learn to adapt to new situations. This may be unfair to the children who seem to be the ‘victim’ of circumstances beyond their control. However, in the five stories told, we learn that adapting is better than resisting although it takes a lot of patience and effort on the children’s part. Claudia shows she is a rational and sensible child to accept her step mother.Ralph, who has three step mothers, gets along with all of them despite their different personalities. Don’t give up hope Colin’s story is the saddest of all. He does not give up hope of one day finding Jack whom he accepts as his own father. He saves all his money and plans to look for his dad when the time is right. Colin is a very determined person despite his young age. He knows what he wants. Robbo also hopes his sister Callie will accept their step father Roy. However, Callie resents Roy and decides to live with her real father in the end.STEP BY WICKED STEP Setting  ~ Step By Wicked Step 1. The haunted house of Harwick. 2. Domestic households of Claudia, Colin, Ralph, Pixie and Robbo. STEP BY WICKED STEP Literary Devices  ~ Step By Wicked Step Simile i. Like someone stepping on stones over a river with water raging on both sides (p. 21) ii. When a great ship strains at the tide, and needs a cabin boy, nobody asks the lad who s peaks as roughly as a gardener’s son, and claims to be Dick Digby, whether his mother knows he’s off to sea. (p. 25) iii. †¦ dressed black as a bat (p. 16) iv.She ( Hetty ) is still wary of me, and I still get on with her that bit better when all the lights are out, and I don’t have to watch her cocking her one side and fiddling with her hair or rolling the cat like a sausage across the downie (p. 103) v. It was like the Arctic. (p 87) vi. Like leftover shoved in a fridge (p. 2) vii. †¦. as narrow as the ones that archers used†¦ (p. 8) viii. †¦over a black and white tiled floor that looked like a huge checkerboard glazed †¦ (p. 4) tight little circle, like campers round a †¦(p. 6) ix. She picked her way†¦.. like someone stepping †¦. (p. 21) x.And I’d just stare down at my plate on my face that said, plain as day, with a look ‘Why should you? ’ (p. 40) Hyperbole Hyperbole is exaggeration. It puts a pictu re into the reader’s mind. Anne Fine occasionally makes a point by overstating an action or object as in the following hyperboles: i. As the driver swung the minibus (p. 1) ii. Just as if the dull-looking binder on the desk was a delicious birthday cake (p. 10) iii. No tears! I would have found obedience†¦. How many nights my pillow would become a flood (p. 17) iv. How many cloudless afternoons I was to water with my private showers (p. 17)Personification Personification is a a figure of speech in which inanimate objects or abstractions are endowed with human qualities or are represented as possessing human form. Anne Fine uses personification to make this novel more dramatic and interesting or to convey a certain mood. By using this literary device, it also helps us to relate more to the object or idea that is being personified because it is easier for us to relate to something with human attributes. i. Flinching as the twisted fingers of trees scraped at the glass (p. 2) ii. And then another flash shot generously across the sky (p. 7) iii.The wind still whistled through the tree, but in the room the silence is palpable (p. 34) Repetition This device is mostly used in two of the vignettes to emphasise on the subject in hand, as shown in the following: i. ‘It isn’t a story,’ said Colin. ‘There isn’t anything to tell. We just went on. ’ (p. 51) ii. ‘There isn’t a story,’ said Colin. (p. 53) iii. ‘There isn’t a story,’ said Colin. ‘We just went on. ’ (p. 56 ) iv. ‘ I’ve told you,’ said Colin. ’There isn’t story. It’s just that, as we went on, I started getting into trouble at school†¦Ã¢â‚¬â„¢ (p. 57 ) v. ‘Dumpa’s the problem’ (pgs 107,112,119 and 125 )

Stewart’s Calculus 8th Edition, Section 1.1, Question 3

Stewart’s Calculus 8th Edition, Section 1.1, Question 3 SAT / ACT Prep Online Guides and Tips This posts contains aTeaching Explanation. You can buyCalculus by Stewarthere. Why You Should Trust Me:I’m Dr. Fred Zhang, and I have a bachelor’s degree in math from Harvard. I’ve racked up hundreds and hundreds of hours of experienceworking withstudents from 5thgradethroughgraduate school, and I’m passionate about teaching. I’ve read the whole chapter of the text beforehand and spent a good amount of time thinking about what the best explanation is and what sort of solutions I would have wanted to see in the problem sets I assigned myself when I taught. Question:The graph of a function f is given.Page in 8th Edition: 19 Short Answers: f(1) = 3 f(-1) ~ -.3 f(x)=1 for x = 0 or 3 f(x)=0 for approximately x=-0.6 The domain of x are real numbers between -2 and 4 (or [-2,4], and the range are real numbers between -1 and 3, or [-1,3]. f is increasing on the interval [-2,1) Homework Answer:Same as Short Answers. Motivated Answers: The question is giving you the graph of the function f. This means that to figure out what f(x) is, we need to look at the y-value of the graph at x. To figure out f(1), we can take put a ruler vertically (up down) on the graph when x=1 and see how high the graph is, which is the same thing as the y-value of the graph. We can count boxes on the graph paper to see the y-value is 3. Just like a), we put a ruler vertically at x=-1, and the graph seems to show a y-value of about -.3 (it could be -0.2 or -0.5, but that’s our best guess by eyeballing it). This means f(-1)~-0.3 The question wants us to find all values of x where f(x)=1. Since 1 is the output of f, and the output means to y-values, we can take a ruler, put it horizontally at 1, and look at where the ruler hits the graph. We see the rule hits the graph two times, once when x is 0, and another time when x = 3. We do the same thing as c), but put the ruler horizontally at 0, which happens to be the x-axis. The graph hits the ruler at x=-.6 approximately. You have to find the domain and range of f. The domain of any function is all valid inputs, or stated the same way, all valid x-values. We can see from the graph that the graph spans the x-range of -2 though 4 (we can count boxes). To write this in interval notation, we write the range is [-2,4]. We use solid brackets here because the graph seems to include the endpoints.The range of f is all valid outputs of f. Stated the same way, these are all valid y-values of the graph. We can see the graph spans the y-range of -1 through 3, or [-1,3]. If you look at the graph you can see that f seems to be increasing throughout the first part of it, from x-values of -2 to 1. Writing this in interval notation, we get [-2,1). We use a parenthesis ) instead of bracket ] because at the point 1, the function is no longer increasing. Video Solution: Get full textbook solutions for just $5/month. PrepScholar Solutions has step-by-step solutions that teach you critical concepts and help you ace your tests. With 1000+ top texts for math, science, physics, engineering, economics, and more, we cover all popular courses in the country, including Stewart's Calculus. Try a 7-day free trial to check it out.

Impact of Child Abuse essays

Impact of Child Abuse essays The impact of abuse reaches all levels of a childs emotions. The two most common emotions are confusion and guilt. Confusion is usually the initial reaction of the child. They will usually wonder what is going on or if this is right or wrong. For a young child these types of questions can be a huge burden on their physcological development. Once the abuse begins the victim experience a tremnedous conflict with their emotions. They feel pleasant due to the attention they are recieving from the parent, as well as the sensual pleasure. On the other hand they experience pain, guilt, and anger for what is being done to them. The questionif this is right or wrong is the greatest conflict within the childs mind. The abuse feels so wrong yet the abuser insits it's okay, taking advantage of the childs mistrust and naivety. Below are the thoughts of an abused victim as she thinks back to her abuse and questions her father. It is an example of this mistrust as well as the confusion which goes through a childs mind. "Since I was a little ten-year-old child, I had to deceive and hide from the world and my mother that my father took a sexual interest in me. Remember how you taught me that art of deceit? First you put me in a situation that had to be kept a secret then you pledged me to secrecy...As a ten- year-old child, what was I supposed to do? You are an intelligent man-you figure out the options available to a ten-year-old in that position." (Dolan 58) Guilt is also a huge emotional trip for the child. The abused will feel tremendous guilt for a numerous reasons: they feel they did nothing to stop the abuse therefore they are responsible and it should continue, they felt uncomfortable but the abuse was sometimes pleasureable, or they somehow deserved and/or caused the abuse. A victim will usually feel this way when their self-esteem has diminshed and they have no more answers for what is happenning. The following quote illustrates that...

Diabeties In Native Americans Essays - Diabetes, Endocrine System

Diabeties In Native Americans Essays - Diabetes, Endocrine System Diabeties In Native Americans Scott Johnson English 101 / 1314 Mrs. Wendalll 14 February, 2000 Diabetes in Native Americans The Native American way of life has certainly changed over the course of the last one hundred years. What used to be a very strong presence on the American frontier is now a humbled group of people pushed onto ground that nobody else wanted. Along with this change came diabetes, which now affects more than sixty percent of the Pima Indians in Arizona and fifty-seven percent of the Aberdeen area of the Indian Health Service (which includes North and South Dakota, Iowa and Nebraska)(Sandrick 42). Native Americans did not have a problem with this affliction until this century. Due to a sudden change in diet and lifestyle, Native Americans have experienced a sharp and sudden rise in diabetes. When the Native Americans were forced onto reservations they stopped hunting and preparing their own food. Instead the U. S. Government gave them food that their bodies were not used to digesting. Indians were not used to eating flour, lard, canned meats and poultry that are swimming in fat, and canned fruits and vegetables packed in sugary syrup (Sandrick 42). They had survived mainly on vegetables and lean buffalo meat that was prepared in a way that many generations before them had done. These foods had kept their bodies with sufficient nutrients for their daily routines and way of life. Their bodies could not handle the extra fat and sugar in their diet. This, coupled with a decrease in intense exercise increased obesity, and brought on the rise of diabetes. The sudden lack of exercise resulted in a large weight increase in the Native American community. Indians were used to roaming the countryside. They had to follow the buffalo or move to warmer weather. Now, they were put into permanent homes and handed their food. This created an overweight, obese group of people. When most of us think of the Great Indians of the last century, we think of a thin, well-defined figure standing stern and serious. When we think of a modern Indian, we have an image of a larger, more rounded type of person. A rounded, non-chiseled face has replaced the classic Indian, high cheekbone, profile. This makes it harder for their bodies to keep blood sugars at a normal level. The result is Type II diabetes. Native Americans most commonly get Type II diabetes. Type II diabetes is not as serious as Type I, but still has serious affects if not properly attended. Some complications include blindness, amputation, stroke, and early heart attack. With Type II diabetes, most of these side effects can be handled with a change in diet and a doctor approved exercise routine (Nash 52), but there is still a steady rise in the number of Indians being diagnosed with diabetes each year. Most (Native Americans) dont have access to what you and I would consider healthy foodgreen vegetables and fresh fruit, says DeCora, who founded the Porcupine Clinic on the Pine Ridge Reservation 16 years ago (Sandrick 42). Native Americans need to learn to prepare and eat different foods in order to eliminate this problem. They need to learn to adapt to their new situation in order to survive. The sudden and recent change in the Native American way of life has prompted many problems. The most serious problem is diabetes. Through education of the disease, and strict dietary and exercise routines the problem can be controlled. American Indians need to take these steps to make sure their culture is preserved. Nobody can change what has happened to the Native Americans in the past, but they can change what will happen to them in the future.

Busines Management Essay Example | Topics and Well Written Essays - 1500 words

Busines Management - Essay Example Although Royal Mail is a private company but it enjoys certain special benefits provided by the government to shield it from growing competition. Such protection played an important role in downfall of the company. The decision taken by the company regarding modernisation and automation can result to job cut of more than 60, 000 employees. In respond to this, Communication Workers Union (CWU) asked the workers to go for a strike till the matter is sought out. Such strikes are not in the UK postal industry, many strikes has taken place in past which are equally responsible for the poor condition of UK postal industry. If the management of Royal Mail want to settle the prevailing unrest, they have to understand implement Strategic Human Resource Management (SHRM). Strategic Human Resource Management brings integration between corporate strategy and HR practices of the company. Such linkage assists the company to achieve its organisational goals in the best possible way (Devine, S. K. 1992). For any organisation its human resource is the biggest asset and it needs proper management so that it can act as strategic partner and the company can gets benefited in the long term (Lawler, et. al., 2006, p. 1-2). For application of SHRM, a proper hierarchy has to followed, like it must start with a basic legal compliance, then it should be followed by efficient HR processes, then setting of effective HRM Programs and alignment of these with the strategic goals of the organization. All these should follow a pyramidal structure (Office of Merit Systems Oversight and Effectiveness, n.d., p. 1). PEST analysis helps the management to understand the prevailing market condition and to set the appropriate strategies. The four elements to PEST analysis are Political scenario, Economical state, Social condition and Technological sectors. Political scenario- politically the country is conservative and its legal system is based on

Personal review of the 6-hour TV series The Day the World Took Off Essay

Personal review of the 6-hour TV series The Day the World Took Off (2000) - Essay Example The commentators espouse all these routes, where it all began, the moments when the world took off. Through the perspective of the commentators, this six-hour series accounts for the provisions and the long-term history that led to the unending social, economic, political and intellectual developments, which have literally shaped the differential development of the modern world. First, the commentators in the series bring history to life for the general audience in their fascinating cross-examinations of laid down modernizations of former years. In their own capacity, the commentators have succinctly supplemented the long read philosophy in the books by helping make this bold step seems like yesterday’s thinking. It is a series, which create originality to the developers of today’s modernization, and helps make everything feasible. It helps to trace the path to our current global status in terms of industrialization and the spillover benefits we enjoy because of the for mer groundbreaking work (Diamond, Jared and James 102). There are plenty of bracing surprises in this series. The commentators raise the familiar odysseys to the growth of manufacture in Britain. According to their perspective, this was one of the areas that ascribe to the rationale behind the name, The Day the World took Off. However, it is the sprout of the extensive and exploring multi-purpose railway network that evokes truly new insights and the intricate details of the era. When the commentators repeatedly chant that this period was the ‘root’ of the revolution, they give the exact tone of the times. They bring the intensity of the involvement, the energy, and the fore-sightedness that the pioneers took time to mould. For example, when they pinpoint the extract from Liverpool Mercury, exposing how the then local M.P, William Huskisson becomes the first casualty of the revolution (Diamond, Jared and James

INTERCULTURAL Essay Example | Topics and Well Written Essays - 750 words

INTERCULTURAL - Essay Example Rules of Social Interaction The rules of interaction among the deaf include maintaining eye contact in order for effective communication. The deaf usually use attention getting mechanisms such as turning the lights on and off, stamping on the floor, tapping on the shoulder, or waving. It is important to hug when greeting or leaving. Pointing to give direction is polite among the deaf. It is important to touch during communication. It is also not important to say â€Å"excuse me† when passing between people using the sign language (Lane, 2005). Language The deaf usually communicate using the sign language. This is a visual-gesture language. It encompasses movement, placement, and expression of body and language. Sign language represents the language among the deaf community. This is a complete language that is able to express humor, emotion, and abstract thoughts. The language has its own language principles and grammatical structure. Whiteness Culture Whiteness culture treats those of the white color as more superior than the others. Racism lies at the heart of that culture. Segregation and discrimination is common among the people of this culture (Warren, 1999). This is normally towards the people who are not of the white origin. Those who ascribe to the whiteness culture do not freely inter mingle with those of other races. They greatly value their race and language. They have racial pride and see others as underdogs. They are conservative and do not freely interact with people of other races. They believe that they should not attend similar institutions as other races. This has led many people especially in America to be discriminated. However, with the advancement of the human rights all races are seen to be equal. Therefore, they are entitled to similar rights and privileges. This culture is slowly fading in America and all citizens are seen as Americans and not as white, Mexican or black. They attend similar institutions where there is free inter r acial interaction. Language Most of the people who subscribe to this culture use a variety of languages in communication; the main ones include English, Germany, Spanish and French. Chinese Culture While there are differences in terms of economic, social and political dimensions between different people of Chinese origin, there are certain core cultural values that are common to all Chinese people. These values are unique and consistently held together by several years and similar language. There is only a single set of core values in China that distinguish their culture from western cultures and Eastern cultures. The Chinese culture has three major element; communist ideology, western values and traditional culture. The traditional culture is diverse and includes several schools of thought such as Buddhism, Taoism, Confucianism, and religious cultures (Fan, 2000). Confucianism forms the foundation of the Chinese tradition. In this case rules are outlined of the social behavior of e ach individual, governing all the interactions in the society. There are five virtues outlined here faithfulness, propriety, righteousness, humanity and wisdom. There are several values and rules of interaction in Chinese culture. Some of them include bearing hardship, governing should be done by leaders rather than the law, egalitarianism /equality, people being naturally good, veneration for the old in the

Renewable Energy Essay Example | Topics and Well Written Essays - 3000 words

Renewable Energy - Essay Example 0.4502 0.0162 7 0.3919 0.0156 8 0.4226 0.0156 9 0.4172 0.0171 10 0.4081 0.0177 11 0.4000 0.0194 12 0.3946 0.0206 13 0.3634 0.0236 14 0.3347 0.0275 15 0.3547 0.0251 16 0.3493 0.0247 17 0.2814 0.0354 18 0.3028 0.0277 19 0.3727 0.0329 20 0.3095 0.0487 21 0.3237 0.0400 22 0.3279 0.0550 The corresponding graph was drawn. 0.70.60.50.40.3 0.20.1 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 (Ti-Ta)/GT From the chart, FR ()=intercept=0.4912. (49.12%) FR UL=Slope=(4.912/(-8.236))=0.596 2. Assess the suitability of the most appropriately oriented part of your roof for installing a solar water heater. How will this affect the performance of the proposed solar water heaters (If you live in an apartment with a flat roof I guess you'll have to pretend that you live on the top floor!) Would there be any practical limitations to the installation of a SWH system. On the roof, the best part would be dependent on two factors: first, it has to be near or at the center part of the roof so that more amount of sunlight falls on the SWH for a longer period of time (from dawn to dusk). Second, it has to be at a requisite to keep it out of reach from children. The limitations in any case would be the amount of open space that can be found on the roof and whether that open space is well lit by sunlight for most part of the day. Also the cost of maintaining and... ) Would there be any practical limitations to the installation of a SWH system. On the roof, the best part would be dependent on two factors: first, it has to be near or at the center part of the roof so that more amount of sunlight falls on the SWH for a longer period of time (from dawn to dusk). Second, it has to be at a requisite to keep it out of reach from children. The limitations in any case would be the amount of open space that can be found on the roof and whether that open space is well lit by sunlight for most part of the day. Also the cost of maintaining and the safety measures adopted play a critical role in the successful and efficient role of the SWH system. 3. Using your own house as an example estimate how much hot water your family consumes each year. (As a rough estimate determine how many showers, baths, and basins of hot water are used per week and make a pro-rata calculation for the annual hot water consumption. Remember that most hot water used would be mixed with the cold water. It's not important to be 100% accurate but this will give you an idea of the magnitude of the hot water usage. Average European hot water usage is currently in the range of 15-35 liters of hot water per person per day depending on if you shower or bath!) 4.

Tintern Abbey Essay Example | Topics and Well Written Essays - 1250 words

Tintern Abbey - Essay Example These lines capture in essence the role played by memory in preserving emotion and in poetic expression. Tintern Abbey in particular is imbued with the spirit of these lines and best embodies the role of memory in Wordsworth's poetry. At the onset of the poem Wordsworth declares that five years have elapsed since his visit to this idyllic location. With gentle contentment he allows the sheer beauty of the well remembered and much beloved landscape to sink into his being and permeate his very senses. His detailed description of nature bedecked in all finery transports the reader and one can almost see the "steep and lofty cliffs" and hear the "soft inland murmur" of the flowing water (Wordsworth 112). He becomes nostalgic and is filled with bittersweet remembrances connected to this gorgeous spectacle. Slowly he is lifted up on the wings of memory and he sees himself as the boy he once was and as the man he has become and recollects the eventful time between the two stages of his life. In the said five years, Wordsworth's life had been tumultuous and he bore witness to much suffering, sorrow and pain brought on by the darker side of human nature. He had spent time in France at the time of the French revolution and had been an idealistic supporter of the revolutionaries' cause. However in light of the tide of violence that swept the country and subsequent hostilities between France and Britain he became disillusioned and heartsick and returned to his country. Therefore his return to Tintern Abbey and its idyllic setting is a homecoming of sorts. Spurred by his memory he recollects the pleasurable bond he forged with nature and how it sustained him in trying times and happily looks forward to forging a new bond for the future. Wordsworth describes the profound effect his memory of this location has had on him despite his prolonged absence. Even as he nursed his loneliness in crowded cities and towns, his memories of this picturesque scene eased his fatigued state and rejuvenated his wearied spirit as it filled him with "sensations sweet,/ Felt in the blood, and felt along the heart,/ And passing even into my purer mind,/ With tranquil restoration" (Wordsworth 113). Thus for Wordsworth his memories serve as an opiate for the senses, bruised and battered by a harsh life. He further credits memory for his random acts of kindness. His memories of nature's bounty is like a wellspring of goodness that never runs dry and spurs him on towards achieving a state of perfect morality. Thus pleasant sensations induced by memory are responsible for bringing out all that is pure and true in him. Wordsworth also attributes memory with providing him an insight "into the life of things" (114). Oftentimes he is baffled and bogged down by the thick fog of mystery surrounding the mechanism of the world and thus obscuring his vision of life itself. But he is relieved of this cumbersome burden by memory which allows him to reach deep within himself to find answers and ultimately enlightenment. He is able to shed the trappings of civilization and

Information systems for management Essay Example | Topics and Well Written Essays - 1250 words

Information systems for management - Essay Example The report will conclude the contribution of Information Systems in an organization along with the importance of authentic data, as the information system is based on the quality and size of captured data that need to be processed. As mentioned in summary, report will demonstrate a role of an information system in an organization that will capture or collect the data related to students attending Friday classes. The group of students is specified as ‘surrogate users’. Consequently, the project sponsor of this group i.e. the tutor, constructed a data entry system that will collect information from surrogate users related to personal data, transport data and the data that is collected up to five weeks. Information system is defined as â€Å"data converted into something valuable and usable for certain user† (, DEFINITION OF INFORMATION SYSTEM). As for this project, a platform named as Joint Application Development (JAD) is constructed within the system consisting of members of the group. For making the process efficient, Tuchman’s model is the best option along with processing of three elements before performing i.e. storming, forming and norming. The project includes different roles of different JAD member within different stages of the project. The JAD members include users, Information technology professionals and consultants. The different roles at different stages of the project were helpful in terms of data capturing quality and authentication. Moreover, it also facilitated real world scenarios over and above the value. Data evaluation was conducted by collecting data from forms in order to use them to develop charts illustrating linkages between queries along with demographics and statistics of users of the system. Moreover, the charts and demographics also demonstrated patterns of human behavior on the system. Furthermore, continuous analyses were performed to examine the system for further improvements and suggestions. The name of the project will be titles as Transport System. Data Capture and Discussions If the data is not in an organized form, it will be difficult to retrieve information and knowledge from the data sources. In order to make the data useful, it must be easily accessible, quick retrievable and effectively manageable. In order to add these values to the data, it must be captures in a logical method. In figure 1, as shown in appendices, data capturing was processed through a personal detail form including attributes such as Full name, Gender and Date of birth. After entering the data, it was stored in the form of tables as Microsoft Access stores the data in the table and in a readable format, as shown in Figure 3 in appendices. After entering the data, daily student travel form was constructed, as shown in Figure 2 in appendices. On a weekly basis, the form was incorporated with travel modes, travel comments and travel modes. Quality The examination of data was based on its quality in ord er to portray real world scenarios to an extent. The system was efficient in demonstrating basic information related to the popular transport modes that were popular among specific genders. For instance, the tube was popular for males along with thirteen men using the tube. Although, tubes were most popular for females with twenty-two women using the tube. However, to adopt real world scenarios, detailed inputs were required. For instance, weather forecast information, travelling of someone from somewhere etc. As people were usually late to reach to destination for many different reasons, a data check box in the system indicating

Renewable Energy Essay Example | Topics and Well Written Essays - 3000 words

Renewable Energy - Essay Example 0.4502 0.0162 7 0.3919 0.0156 8 0.4226 0.0156 9 0.4172 0.0171 10 0.4081 0.0177 11 0.4000 0.0194 12 0.3946 0.0206 13 0.3634 0.0236 14 0.3347 0.0275 15 0.3547 0.0251 16 0.3493 0.0247 17 0.2814 0.0354 18 0.3028 0.0277 19 0.3727 0.0329 20 0.3095 0.0487 21 0.3237 0.0400 22 0.3279 0.0550 The corresponding graph was drawn. 0.70.60.50.40.3 0.20.1 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 (Ti-Ta)/GT From the chart, FR ()=intercept=0.4912. (49.12%) FR UL=Slope=(4.912/(-8.236))=0.596 2. Assess the suitability of the most appropriately oriented part of your roof for installing a solar water heater. How will this affect the performance of the proposed solar water heaters (If you live in an apartment with a flat roof I guess you'll have to pretend that you live on the top floor!) Would there be any practical limitations to the installation of a SWH system. On the roof, the best part would be dependent on two factors: first, it has to be near or at the center part of the roof so that more amount of sunlight falls on the SWH for a longer period of time (from dawn to dusk). Second, it has to be at a requisite to keep it out of reach from children. The limitations in any case would be the amount of open space that can be found on the roof and whether that open space is well lit by sunlight for most part of the day. Also the cost of maintaining and... ) Would there be any practical limitations to the installation of a SWH system. On the roof, the best part would be dependent on two factors: first, it has to be near or at the center part of the roof so that more amount of sunlight falls on the SWH for a longer period of time (from dawn to dusk). Second, it has to be at a requisite to keep it out of reach from children. The limitations in any case would be the amount of open space that can be found on the roof and whether that open space is well lit by sunlight for most part of the day. Also the cost of maintaining and the safety measures adopted play a critical role in the successful and efficient role of the SWH system. 3. Using your own house as an example estimate how much hot water your family consumes each year. (As a rough estimate determine how many showers, baths, and basins of hot water are used per week and make a pro-rata calculation for the annual hot water consumption. Remember that most hot water used would be mixed with the cold water. It's not important to be 100% accurate but this will give you an idea of the magnitude of the hot water usage. Average European hot water usage is currently in the range of 15-35 liters of hot water per person per day depending on if you shower or bath!) 4.

Information systems for management Essay Example | Topics and Well Written Essays - 1250 words

Information systems for management - Essay Example The report will conclude the contribution of Information Systems in an organization along with the importance of authentic data, as the information system is based on the quality and size of captured data that need to be processed. As mentioned in summary, report will demonstrate a role of an information system in an organization that will capture or collect the data related to students attending Friday classes. The group of students is specified as ‘surrogate users’. Consequently, the project sponsor of this group i.e. the tutor, constructed a data entry system that will collect information from surrogate users related to personal data, transport data and the data that is collected up to five weeks. Information system is defined as â€Å"data converted into something valuable and usable for certain user† (, DEFINITION OF INFORMATION SYSTEM). As for this project, a platform named as Joint Application Development (JAD) is constructed within the system consisting of members of the group. For making the process efficient, Tuchman’s model is the best option along with processing of three elements before performing i.e. storming, forming and norming. The project includes different roles of different JAD member within different stages of the project. The JAD members include users, Information technology professionals and consultants. The different roles at different stages of the project were helpful in terms of data capturing quality and authentication. Moreover, it also facilitated real world scenarios over and above the value. Data evaluation was conducted by collecting data from forms in order to use them to develop charts illustrating linkages between queries along with demographics and statistics of users of the system. Moreover, the charts and demographics also demonstrated patterns of human behavior on the system. Furthermore, continuous analyses were performed to examine the system for further improvements and suggestions. The name of the project will be titles as Transport System. Data Capture and Discussions If the data is not in an organized form, it will be difficult to retrieve information and knowledge from the data sources. In order to make the data useful, it must be easily accessible, quick retrievable and effectively manageable. In order to add these values to the data, it must be captures in a logical method. In figure 1, as shown in appendices, data capturing was processed through a personal detail form including attributes such as Full name, Gender and Date of birth. After entering the data, it was stored in the form of tables as Microsoft Access stores the data in the table and in a readable format, as shown in Figure 3 in appendices. After entering the data, daily student travel form was constructed, as shown in Figure 2 in appendices. On a weekly basis, the form was incorporated with travel modes, travel comments and travel modes. Quality The examination of data was based on its quality in ord er to portray real world scenarios to an extent. The system was efficient in demonstrating basic information related to the popular transport modes that were popular among specific genders. For instance, the tube was popular for males along with thirteen men using the tube. Although, tubes were most popular for females with twenty-two women using the tube. However, to adopt real world scenarios, detailed inputs were required. For instance, weather forecast information, travelling of someone from somewhere etc. As people were usually late to reach to destination for many different reasons, a data check box in the system indicating

Bridge On The River Kwai Essay Example for Free

Bridge On The River Kwai Essay For example: a characters intention, sequence of events, etc? A part in the movie which was confusing was when Nicholson decided to assist the Japanese in building the bridge. He becomes so obsessed in building the bridge (which he regarded as a symbol of British efficiency and resourcefulness, which will be remembered for times to come) that he fails to identify that he is collaborating with the Japanese even when he was informed by his own medical officer. He becomes so blinded by this that he, a man of principles and one who follows rules mentioned in the Geneva Convention is willing to make his officers work for the timely completion of the bridge. Saito tells Nicholson that it will not be necessary to bring the copy of the Geneva Convention and walks away making the silence/no-response response speak for him. Due to the indirect form of communication it is hard to follow if Saito means that Nicholson should not bring the book because he has previously read it and now that it has been brought to his attention he will not make the British officers do manual abour or that he has read the book but will still make the British officers do manual labour. Making silence speak instead of words and the indirect form of communication gives the essence of a reactive culture. Another part of the movie which was hard to understand was when Nicholson fell on the detonator at the end of the film. It is unclear if Nicholson had an intention to destroy the bridge or if it was a mere accident. His last lines what have I done do clarify his intent but due to the fact that he falls on the plunger there was no ample clarification for the same. There is a possibility that due to his love for the bridge uilt by the British soldiers he had Just proceeded towards the plunger to disconnect it, however, dies while doing so and hence falls on it instead. 0 What was the best thing about the movie? What was the worst? The best part about the film was the way Nicholson stood by his principles and persuaded Saito to not make his officers do manual labour and hence go by the rules mentioned in the Geneva Convention. The astonishing part about this was that this was taking place in a POW camp where the bargaining power was higher with Saito than Nichonson. Nicholsonss leadership abilities made his officers not give in to Saito and start anual work, and hence continued to be punished in the oven. His leadership abilities are portrayed well when the British medical officer comes to meet him at the oven, Nicholson was more concern about his officers than about himself even after he was deprived of food and water for numerous days. His pride and patriotic qualities tacilitate him to stand by his word against Saito even atter physical and emotional harm is being inflicted on him during the period of negotiation. On the other hand I feel that 2 Saito underestimated his BATNA (Best alternative to a negotiated agreement). I feel hat during the time of positional bargaining with Nicholson, ultimately carving under pressure and letting him out of the oven, Saito should have used his own soldiers for the bridge (till such time Nicholson was persuaded to make his men work) and created more discipline and collaboration among the workers for the timely completion of the bridge. I feel that there was little room for principled negotiation as Nicholson was not willing to do so. The worse part of the movie was the collapse of the bridge in the end. A bridge which was the cause of various negotiations between Saito and Nicholson, in the process esulted in numerous threats, blackmail and infliction of physical and emotional harm from Saito to Nicholson and consequentially got Nicholson himself killed. By the collapse of the bridge all that seemed to be a waste. 0 What did you find to be the most interesting or surprising element of the film? Why? The most surprising element of the film is the fact when Nicholson decides to take over the responsibility to construct the bridge after having won the negotiation against Saito and having no obligation towards doing so. He becomes so obsessed in building the bridge (which he regarded as a symbol of British efficiency and resourcefulness, which will be remembered for times to come) that he fails to identify that he is collaborating with the Japanese even when he was informed by his own medical officer. He defends himself in front of the officer by saying that he is getting the bridge made efficiently as he wants people who use to bridge in the future to remember how it was built and who built it. He also adds that by working on the bridge together his men will feel like British soldiers rather than Japanese prisoners. The bridge was Nicholsons trophy and was not an instrument to keep the British soldiers together. He becomes so blinded by this that he, a man of principles and one who follows rules mentioned in the Geneva Convention is willing to make his officers work for the timely completion of the bridge. He forgot about the war and his loyalties and started to aid in the improvement of the bridge rather than working in accordance with the instructions provided by the Japanese. It was this perceived duty that lead to his downfall ultimately. This was due to the fact that if he was not that keen of building a good bridge, he would not have reacted the way he did once he identified the explosives and could have prevented the unnecessary loss f lives towards the end including his own. 3 0 What is the movie trying to tell viewers? The movie glorifies the western civilization, especially that of the British. On the other hand it portrays the east Oapanese) to be weak and still learning. 0 How does it go about conveying this message? In the beginning Saito and Nicholson did not get along well. Nicholson insisted that his officers were not to do manual labour as per the rules stated in the Geneva Convention, however, Saito was more bothered about getting the bridge ready on time. When the numerous attempts Saito made to persuade the stubborn Nicholson ailed he tried a friendly approach by offering the starved Nicholson with Beef corn and Whiskey and by telling him that the senior officers including him do not have to manual labour. Saito had to ultimately carve and wilt towards the strong armed Nicholson even though Nicholson was in his POW camp. This was done using the anniversary of Japans victory in the Russo-Japanese war in order to save face. The concept of saving face is due to the impact of collectivism. This concept of saving face suggests that Saito is from a country with a high long term orientation index (L TO) culture. Not only this, once Nicholson took up the responsibility of the bridge and implemented British designs, oversight and ingenuity to it, he ended up making a more technically sound and competent bridge than the Japanese could have otherwise built. What cultural issues do you see? How are these portrayed? o Individualist, Power distance and hierarchy, Communication styles, role of gender, etc? In the initial part of the movie the American soldier bribes the Japanese captain to assist him in getting hospitalized. The Japanese soldier does not use the word No. He indirectly tries to xpress his reluctance to hospitalize the American. When the American insists using the usual American loud and verbose atti tude, the solder uses silence for the same and walks away after moving his head from side to side. This indirect and non-verbal form of communication indicates that the Japanese is from a collectivist, low IDV and a high context culture. The American soldier wanted to be hospitalized as he was self-centered. This along with the fact that he ran away shows that he was individualistic and did not care about anyone else. It can therefore be perceived that e has a high internal locus of control, signifying that he is in charge of his own life and that what happens to him is a result of his own actions and hence indicates that he is from a high IDV and a low context culture. 4 A more participative hierarchy is portrayed by the British soldiers. This can be seen when the British officers and their Colonel meet and have a debate on the topic of escape from the camp. One of the officers directly disagreed with Nicholson when he advised the officers not to escape from the camp. The officer argued that staying in the camp is a sure way of getting killed. This shows the impact of an individualistic ulture as in a collectivist culture disagreement is usually done indirectly or very discreetly. The British (westerners) usually like to near the word No in order tor the meaning to be conveyed effectively; they do not understand indirect negative responses. This kind of participative nature and direct denial from an officer to the colonels advice signifies a low power distance index (PDI) as power seems to be shared and well dispersed. This direct approach can also be seen in Nicholson when Saito tells him at the beginning of the movie that he will order his officers to work and he directly replies saying No. The local woman are looking up to the men and taking care of them in the scene where the American is returning the POW camp to destroy the bridge. It seems as if the women expect the men to be tough, assertive and be the provider. This shows that the local community is a high Masculinity index (MAS) culture. Hierarchy has been shown in many instances during the film. As far as the Japanese were concern, the Japanese soldier taking his cap off and bowing (In Japan there are rules for the Japanese equivalent of the Western handshake for who to bow, how much they should bow and hence are difficult to master) to Saito at the beginning of he film, bringing him a platform to stand on as he was short and so that people look up to him and salute him, were some instances showing hierarchy amongst the Japanese. Also the man responsible for fanning the Saito does not speak due to respect and even if it is raining the soldier still stands outside the premises as they are lower down in the hierarchy. 0 Did you like the film? Why or why not? Yes, I liked the film. The film did not have a right or wrong due to which it follows a unique and realistic approach based on individuals. Like more war films it is neither for nor against the war. By the end of the movie the viewer is less interested in the fact that who wins the war than about how the individuals will behave. 0 What adjective would you use to describe your reaction to the film? Why did you react this way? As rightly described by Clipton at the end of the film, the adjective that can be used to describe my reaction of the film is madness. Every individual in the film is inclined towards their own duty, order and chaos that they lose what really matters and what is most important. Emotions and orders have taken over the right or sane thing to do. The characters have hence led the situation to go out of hand. 0 In what ways can you identify with the movie, its characters and its message? The movie is more about the events surrounding the war rather than the battles and the fighting. These events have turned mortality, Judgment and sound thought around and have eventually lead to madness. There are various examples of this so called madness in the movie; the madness of Nicholson who says that working with the enemy is not going against ones country, the madness ot the American who accepts to return to a camp on a suicide mission where he escaped, nearly getting killed and he madness of a struggle the obliged men to make harsh decisions. Based on your knowledge of negotiations what do you think was going on? o What kind of dirty tricks were being used? Give 3 examples. Initially Saito used a forceful approach in negotiating with the Nicholson. Saito caused emotional (By cutting food supply and taking people from the hospital to work) and physical (When Saito slapped Nicholson and put him in the oven) means in order to persuade the soldiers to commence work on the bridg e. Saito underestimated his BATNA (Best alternative to a negotiated agreement). I feel that during the time of positional bargaining with Nicholson, ultimately carving under pressure and letting them out of the oven, Saito should have used his own soldiers for the bridge (Till such time Nicholson was persuaded to make his men work) and created discipline and collaboration among the workers for the timely completion of the bridge. I feel that there was little room for principled negotiation as Nicholson was not willing to do so. One of the dirty tricks used by Saito was that of threat when he warned Nicholson that if he does not order his troops to start work on the bridge he will be shot. Another dirty trick used by Saito in the initial part of the movie was that of Chinese water torture, signifying that he kept repeating his demands without bothering much about what Nicholson has to say. 6 The third dirty trick in the movie was when Saito asked the British soldier to meet with Nicholson for 5 minutes and tell him that if he doesnt order his officers to start work he will make the people in the hospital work. This was a bluff on Saitos part, even after hearing this Nicholson never changed his decision and the soldiers at the hospital were never made to work. What values are portrayed? Independence, cooperation, hierarchy, power, etc? The values that are portrayed in the movie are Independence, hierarchy, bravery, power, pride, patriotism, collaboration, leadership and commitment to duty. 0 How were these values portrayed? o Give examples of the type of behaviour that you base your answer upon Independence was shown when the American played on his life in order to esca pe from the Japanese camp in order to be free. Hierarchy can be seen by the Japanese soldiers to Saito when they remove their cap and bow to him, when they get him a raised platform during the time of his speech, y the guard to Saitos house has to stand outside even though it is raining and by the man responsible for fanning not speaking in the entire movie. These major differences in hierarchy and the soldiers accepting an unequal distribution of power indicates a high power distance index (PDI). Bravery has been shown by Nicholson when he did not give in even though Saito threaten ed him witn a gun hidden in the truck. Collaboration was shown by the soldiers once the bridge was the responsibility of Nicholson. This was not present when Saito is in charge of the bridge as stated by he British engineer when he was questioned by Nicholson what he would have done differently if this was his bridge. Because of the task-oriented approach of Nicholson and he planning ahead step by step which can be seen when he says this is the end of the agenda while meeting with Saito for discussion of the proposal for the new bridge, the soldiers were able to effectively collaborate. This suggests that Nicholson is from a linear Active Culture. Pride and patriotism can be seen when the British officers were marching in group and whistling. 7 Leadership was portrayed by Nicholson when the British soldier brought him food in he oven. Nicholson had not seen sun light for days, was weak and deprived of food and water but even then he was more concern about his officers than about himself. Commitment to duty was shown by Nicholson when he took over the responsibility of the bridge. He made the best and most efficient bridge possible, forgetting about the war and his loyalties. 0 Was there anything about the movie (sights, sounds, smells, colors, background scenes) that told you something about the culture that you were dealing with? What did you learn? The type of culture seemed to be a collectivist one. This can be seen rom the behavior of the society when the American escapes and reaches a village. 0 What does the movie tell you about the culture of the producers of the film? What about the film gives you this indication? The movie portrays glorification of western civilization in terms of perseverance and inventiveness, specifically the British. This indicates that the producer is from the British culture. Nicholson was able to circumvent Japanese commands due to his Engineers having the ability to construct a more technically sound bridge than the Japanese Engineers. 0 How do you think other audiences would react to this film? Why? I feel that other audience would feel that the film is more about the events surrounding the war rather than the battles and the fighting. These events have turned mortality, judgment and sound thought around and have eventually lead to madness. There are various examples of this so called madness in the movie; the madness of Nicholson who says that working with the enemy is not going against ones country, the madness ot the American who accepts to return to a camp where ne escaped, nearly getting killed and the madness of a struggle the obliged men to make harsh decisions.

Mathematical description of OFDM

Mathematical description of OFDM When we talk about the Mathematical description of OFDM then we cannot neglect the following mathematical treatments: The Fourier transform The use of the Fast Fourier Transform in OFDM The guard interval and its implementation As we have discussed above that a large number of narrowband carriers which are spaced close to each other in frequency domain are transmitted by OFDM. The modern digital technique that is used in the OFDM is FFT i-e Fast Fourier transform (FFT) and due to the use of FFT it reduces the number of modulators and demodulators both at the receiver and transmitter side. Fig. 4 Examples of OFDM spectrum (a) a single subchannel, (b) 5 carriers At the central frequency of each subchannel, there is no crosstalk from other subchannels. Mathematically, each carrier can be described as a complex wave: (1) sc(t) = the real part of original signal. Ac(t) = the Amplitude f c(t) = Phase of carrier (t)= symbol duration period Ac(t) and f c(t) use to fluctuate on symbol by symbol basis. Parameter values are constant over (t). As we know that OFDM posses many carriers. So the complex signals ss(t) is represented as: (2) where This is of course a continuous signal. If we consider the waveforms of each component of the signal over one symbol period, then the variables Ac(t) and f c(t) take on fixed values, which depend on the frequency of that particular carrier, and so can be rewritten: If the signal is sampled using a sampling frequency of 1/T, then the resulting signal is represented by: (3) At this point, we have restricted the time over which we analyse the signal to N samples. It is convenient to sample over the period of one data symbol. Thus we have a relationship: t =NT If we now simplify eqn. 3, without a loss of generality by letting w 0=0, then the signal becomes: (4) Now Eq. 4 can be compared with the general form of the inverse Fourier transform: (5) In eq. 4, the function is no more than a definition of the signal in the sampled frequency domain, and s(kT) is the time domain representation. Eqns. 4 and 5 are equivalent if: (6) This is the same condition that was required for orthogonality (see Importance of orthogonality). Thus, one consequence of maintaining orthogonality is that the OFDM signal can be defined by using Fourier transform procedures. The Fourier transform Fourier transform actually relate events in time domain to events in frequency domain. There are different version of FFT which are used according to requirement of different sort of work The conventional transform provide the relation of continuous signals. Note that Continuous signals are not limited in both time and frequency domain. Though, it is better to sample the signal so that the signal processing becomes simpler. But it lead to an aliasing when we sample the signals with infinite spectrum and the processing of signals which are not time limited can lead to another problem that is referred to as space storage. DFT (discrete Fourier transforms) is use to overcome the above problem of signal processing. The original definition of DFT reveals that the time waves have to repeat frequently and similarly frequency spectrum repeat frequently in frequency domain. Basically in DFT the signals can be sampled in time domain as well as in frequency domain. The Fourier transform is the process in which the signal represented in the time domain transformed in frequency domain, while the reverse process uses IFT which is the inverse Fourier transform. The use of the Fast Fourier Transform in OFDM The main reason that the OFDM technique has taken a long time to become a prominence has been practical. It has been difficult to generate such a signal, and even harder to receive and demodulate the signal. The hardware solution, which makes use of multiple modulators and demodulators, was somewhat impractical for use in the civil systems. The ability to define the signal in the frequency domain, in software on VLSI processors, and to generate the signal using the inverse Fourier transform is the key to its current popularity. The use of the reverse process in the receiver is essential if cheap and reliable receivers are to be readily available. Although the original proposals were made a long time ago [Weinstein and Ebert], it has taken some time for technology to catch up. At the transmitter, the signal is defined in the frequency domain. It is a sampled digital signal, and it is defined such that the discrete Fourier spectrum exists only at discrete frequencies. Each OFDM carrier corresponds to one element of this discrete Fourier spectrum. The amplitudes and phases of the carriers depend on the data to be transmitted. The data transitions are synchronised at the carriers, and can be processed together, symbol by symbol (Fig. 5). Fig. 5 Block diagram of an OFDM system using FFT, pilot PN sequence and a guard bit insertion [Zou and Wu] The definition of the (N-point) discrete Fourier transform (DFT) is: (DFT) (7) and the (N-point) inverse discrete Fourier transform (IDFT): (IDFT) (8) A natural consequence of this method is that it allows us to generate carriers that are orthogonal. The members of an orthogonal set are linearly independent. Consider a data sequence (d0, d1, d2, †¦, dN-1), where each dn is a complex number dn=an+jbn. (an, bn= ± 1 for QPSK, an, bn= ± 1,  ± 3 for 16QAM, †¦ ) k=0,1,2, †¦, N-1 (9) where fn=n/(ND T), tk=kD t and D t is an arbitrarily chosen symbol duration of the serial data sequence dn. The real part of the vector D has components k=0,1,..,N-1 (10) If these components are applied to a low-pass filter at time intervals D t, a signal is obtained that closely approximates the frequency division multiplexed signal (11) Fig. 5 illustrates the process of a typical FFT-based OFDM system. The incoming serial data is first converted form serial to parallel and grouped into x bits each to form a complex number. The number x determines the signal constellation of the corresponding subcarrier, such as 16 QAM or 32QAM. The complex numbers are modulated in a baseband fashion by the inverse FFT (IFFT) and converted back to serial data for transmission. A guard interval is inserted between symbols to avoid intersymbol interference (ISI) caused by multipath distortion. The discrete symbols are converted to analog and low-pass filtered for RF upconversion. The receiver performs the inverse process of the transmitter. One-tap equalizer is used to correct channel distortion. The tap-coefficients of the filter are calculated based on the channel information. Fig. 6 Example of the power spectral density of the OFDM signal with a guard interval D = TS/4 (number of carriers N=32) [Alard and Lassalle] Fig 4a shows the spectrum of an OFDM subchannel and Fig. 4b and Fig. 6 present composite OFDM spectrum. By carefully selecting the carrier spacing, the OFDM signal spectrum can be made flat and the orthogonality among the subchannels can be guaranteed. The guard interval and its implementation The orthogonality of subchannels in OFDM can be maintained and individual subchannels can be completely separated by the FFT at the receiver when there are no intersymbol interference (ISI) and intercarrier interference (ICI) introduced by transmission channel distortion. In practice these conditions can not be obtained. Since the spectra of an OFDM signal is not strictly band limited (sinc(f) function), linear distortion such as multipath cause each subchannel to spread energy into the adjacent channels and consequently cause ISI. A simple solution is to increase symbol duration or the number of carriers so that distortion becomes insignificant. However, this method may be difficult to implement in terms of carrier stability, Doppler shift, FFT size and latency. Fig. 7 The effect on the timing tolerance of adding a guard interval. With a guard interval included in the signal, the tolerance on timing the samples is considerably more relaxed. Fig. 8 Example of the guard interval. Each symbol is made up of two parts. The whole signal is contained in the active symbol (shown highlighted for the symbol M) The last part of which (shown in bold) is also repeated at the start of the symbol and is called the guard interval One way to prevent ISI is to create a cyclically extended guard interval (Fig. 7, 8), where each OFDM symbol is preceded by a periodic extension of the signal itself. The total symbol duration is Ttotal=Tg+T, where Tg is the guard interval and T is the useful symbol duration. When the guard interval is longer than the channel impulse response (Fig. 3), or the multipath delay, the ISI can be eliminated. However, the ICI, or in-band fading, still exists. The ratio of the guard interval to useful symbol duration is application-dependent. Since the insertion of guard interval will reduce data throughput, Tg is usually less than T/4. The reasons to use a cyclic prefix for the guard interval are: to maintain the receiver carrier synchronization ; some signals instead of a long silence must always be transmitted; cyclic convolution can still be applied between the OFDM signal and the channel response to model the transmission system. http://www.wirelesscommunication.nl/reference/chaptr05/ofdm/ofdmqual.htm Multipath Challenges In an OFDM-based WLAN architecture, as well as many other wireless systems, multipath distortion is a key challenge. This distortion occurs at a receiver when objects in the environment reflect a part of the transmitted signal energy. Figure 2 illustrates one such multipath scenario from a WLAN environment. Figure 2: Multipath reflections, such as those shown here, create ISI problems in OFDM receiver designs. Click here for larger version of Figure 1b Multipath reflected signals arrive at the receiver with different amplitudes, different phases, and different time delays. Depending on the relative phase change between reflected paths, individual frequency components will add constructively and destructively. Consequently, a filter representing the multipath channel shapes the frequency domain of the received signal. In other words, the receiver may see some frequencies in the transmitted signal that are attenuated and others that have a relative gain. In the time domain, the receiver sees multiple copies of the signal with different time delays. The time difference between two paths often means that different symbols will overlap or smear into each other and create inter-symbol interference (ISI). Thus, designers building WLAN architectures must deal with distortion in the demodulator. Recall that OFDM relies on multiple narrowband subcarriers. In multipath environments, the subcarriers located at frequencies attenuated by multipath will be received with lower signal strength. The lower signal strength leads to an increased error rate for the bits transmitted on these weakened subcarriers. Fortunately for most multipath environments, this only affects a small number of subcarriers and therefore only increases the error rate on a portion of the transmitted data stream. Furthermore, the robustness of OFDM in multipath can be dramatically improved with interleaving and error correction coding. Lets look at error correction and interleaving in more detail. Error Correction and Interleaving Error correcting coding builds redundancy into the transmitted data stream. This redundancy allows bits that are in error or even missing to be corrected. The simplest example would be to simply repeat the information bits. This is known as a repetition code and, while the repetition code is simple in structure, more sophisticated forms of redundancy are typically used since they can achieve a higher level of error correction. For OFDM, error correction coding means that a portion of each information bit is carried on a number of subcarriers; thus, if any of these subcarriers has been weakened, the information bit can still arrive intact. Interleaving is the other mechanism used in OFDM system to combat the increased error rate on the weakened subcarriers. Interleaving is a deterministic process that changes the order of transmitted bits. For OFDM systems, this means that bits that were adjacent in time are transmitted on subcarriers that are spaced out in frequency. Thus errors generated on weakened subcarriers are spread out in time, i.e. a few long bursts of errors are converted into many short bursts. Error correcting codes then correct the resulting short bursts of errors. OR for guard interval Handling ISI The time-domain counter part of the multipath is the ISI or smearing of one symbol into the next. OFDM gracefully handles this type of multipath distortion by adding a guard interval to each symbol. This guard interval is typically a cyclic or periodic extension of the basic OFDM symbol. In other words, it looks like the rest of the symbol, but conveys no new information. Since no new information is conveyed, the receiver can ignore the guard interval and still be able to separate and decode the subcarriers. When the guard interval is designed to be longer than any smearing due to the multipath channel, the receiver is able to eliminate ISI distortion by discarding the unneeded guard interval. Hence, ISI is removed with virtually no added receiver complexity. It is important to note that discarding the guard interval does have an impact on the noise performance since it reduces the amount of energy available at the receiver for channel symbol decoding. In addition, it reduces the data rate since no new information is contained in the added guard interval. Thus a good system design will make the guard interval as short as possible while maintaining sufficient multipath protection. Why dont single carrier systems also use a guard interval? Single carrier systems could remove ISI by adding a guard interval between each symbol. However, this has a much more severe impact on the data rate for single carrier systems than it does for OFDM. Since OFDM uses a bundle of narrowband subcarriers, it obtains high data rates with a relatively long symbol period because the frequency width of the subcarrier is inversely proportional to the symbol duration. Consequently, adding a short guard interval has little impact on the data rate. Single carrier systems with bandwidths equivalent to OFDM must use much shorter duration symbols. Hence adding a guard interval equal to the channel smearing has a much greater impact on data rate. http://www.commsdesign.com/design_corner/showArticle.jhtml?articleID=16504605 As we know that cyclic prefix is used to restore the orthogonality and preserve ISI, but the question that arises is that how the orthogonality destroyed between the subcarriers and how cyclic prefix restore the orthogonality. [1] [2] The orthogonality between subcarriers is destroyed due to the channel dispersion whenever the signal is transmitted over a channel and this cause ICI and due to the longer delay ISI occur among the OFDM symbols which are in sequence. [1] Further more there is no any interference in uncorrupted OFDM signal when they are demodulated but when we talk about the time dispersive channel the OFDM subcarriers lost there orthogonality. The main cause behind this is that the demodulator correlation interval for one path will overlap with the symbol boundary of a different path as show in the figure [ ] [ 2] Fig. 4.11 16QAM constellation We will see that this makes equalization in the receiver very simple. If multipath exceeds the CP, then constellation points in the modulation is distorted. As can be seen from Fig. 4.11, when multipath delay exceeds the CP, the subcarriers are not guaranteed to be orthogonal anymore, since modulation points may fall into anywhere in the respective contour. As delay spread gets more severe, the radius of the contour enlarges and crosses the other contours. Hence, this causes error. The CP is utilized in the guard period between successive blocks and constructed by the cyclic extension of the OFDM symbol over a period Ï„ : (4.3) The required criteria is that Ï„ is chosen bigger than channel length Ï„h so as not to experience an ISI. The CP requires more transmit energy and reduces the bit rate to (Nb/NT +Ï„ ), where b is the bits that a subcarrier can transmit. The CP converts a discrete time linear convolution into a discrete time circular convolution. Thus, transmitted data can be modeled as a circular convolution between the channel impulse response and the transmitted data block, which in the frequency domain is a pointwise multiplication of DFT samples. Then received signal becomes Where (4.5) Hence, kth subcarrier now has a channel component Hk, which is the fourier transform of h(t) at the frequency fk. The OFDM symbol is sampled (t = nT and fk = k/NT) in the receiver and demodulated with an FFT. Consequently, the received data has the following form yk = Hk xk, k = 0, . . . ,N −1. (4.6) The received actual data can be retrieved with N parallel one-tap equalizers. One-tap equalizer simply uses the estimated channel ( ˆHk) components and use it to retrieve estimated ˆ xk as follows (4.7) Also note that the spectrum of OFDM decays slowly. This causes spectrum leakage to neighboring bands. Pulse shaping is used to change the spectral shape by either commonly used raised cosine time window or passing through a filter. An OFDM system design considers setting the guard interval (Ï„ ) as well as the symbol time (T) and FFT size with respect to desired bit rate B and given tolerable delay spread. The guard interval is selected according to delay spread, and typically it is 2–4 times the root-mean-squared delay spread with respect to chosen coding and modulation. Symbol time is set with respect to guard time and it is desirable to select much larger than the guard time since the loss in SNR in the guard time is compensated. Symbol time as we know determines the subcarrier spacing ( fb = 1/T). Number of subcarriers N is found with respect to desired bit rate, since total number of bits (bT ) to carry in one symbol is found with B/(T +Ï„ ) and selected coding and modulation determines the number of bits (b) in one subcarrier. Hence, the number of subcarriers is N = bT /b. For instance, b is two for 16QAM with rate 1/2. The required bandwidth (W) is then N âˆâ€" fb. Alternatively, this method is reversed to find out the symbol time starting from the given bandwidth. OR Cyclic-prefix insertion As I m talking about the time dispersive channel I want to include that in time dispersive channel the subcarrier not only have inter symbol interference within them but they also posses interference between them. As we know that in case of time dispersive channel the frequency-selective channel frequency response is equivalent to time dispersion on the radio channel. There are two reasons of orthogonality between OFDM subcarriers. Due to frequency-domain separation. The specific frequency-domain structure of each subcarrier. Even if the frequency-domain channel is constant over a bandwidth corresponding to the main lobe of an OFDM subcarrier and only the subcarrier side lobes are corrupted due to the radio-channel frequency selectivity, the orthogonality between subcarriers will be lost with inter-subcarrier interference as a consequence. Due to the relatively large side lobes of each OFDM subcarrier, already a relatively limited amount of time dispersion or, equivalently, a relatively modest radio-channel frequency selectivity may cause non-negligible interference between subcarriers. Time dispersion and corresponding received-signal timing Figure 9 Time dispersion and corresponding received-signal timing. To deal with this problem and to make an OFDM signal truly insensitive to time dispersion on the radio channel, so-called cyclic-prefix insertion is typically used in case of OFDM transmission. As illustrated in Figure 10, cyclic-prefix insertion implies that the last part of the OFDM symbol is copied and inserted at the beginning of the OFDM symbol. Cyclic-prefix insertion thus increases the length of the OFDM symbol from Tu to Tu +TCP, where TCP is the length of the cyclic prefix, with a corresponding reduction in the OFDM symbol rate as a consequence. As illustrated in the lower part of Figure 10, if the correlation at the receiver side is still only carried out over a time interval Tu =1/∆f , subcarrier orthogonality will then be preserved also in case of a time-dispersive channel, as long as the span of the time dispersion is shorter than the cyclic-prefix length. Cyclic-prefix insertion Figure 10. Cyclic-prefix insertion Cyclic-prefix insertion is beneficial in the sense that it makes an OFDM signal insensitive to time dispersion as long as the span of the time dispersion does not exceed the length of the cyclic prefix. The drawback of cyclic-prefix insertion is that only a fraction Tu /( Tu +TCP) of the received signal power is actually utilized by the OFDM demodulator, implying a corresponding power loss in the demodulation. In addition to this power loss, cyclic-prefix insertion also implies a corresponding loss in terms of bandwidth as the OFDM symbol rate is reduced without a corresponding reduction in the overall signal bandwidth. One way to reduce the relative overhead due to cyclic-prefix insertion is to reduce the subcarrier spacing ∆f , with a corresponding increase in the symbol time Tu as a consequence. http://wirelesscafe.wordpress.com/2009/04/20/ofdm-as-downlink-transmission-scheme-for-lte/