Friday, December 27, 2019

How Chemical Hand Warmers Work

If your fingers are cold or your muscles ache, you can use chemical hand warmers to heat them up. There are two types of chemical hand warmer  products, both using exothermic (heat-producing) chemical reactions. Here is how they work. Key Takeaways: Chemical Hand Warmers Chemical hand warmers rely on exothermic chemical reactions to release heat.There are two main types of chemical hand warmers. One type releases heat by air activation. The other type releases heat when a supersaturated solution crystallizes.Air-activated hand warmers are single use products. Chemical solution hand warmers are re-usable. How Air Activated Hand Warmers Work Air-activated hand warmers are long-lasting chemical hand warmers that start working as soon as you unseal the packaging, exposing it to oxygen in​ the  air. The packets of chemicals produce heat from oxidizing iron into iron oxide (Fe2O3) or rust. Each packet contains iron,  cellulose (or sawdust -- to bulk up the product), water, vermiculite (serves as a water reservoir), activated carbon (distributes heat uniformly),  and salt (acts as a catalyst). This type of hand warmer produces heat anywhere from 1 to 10 hours. Its common to shake the packets to improve circulation, which speeds the reaction and increases the heat. Its possible to get a burn from direct contact between the hand warmer and skin, so the packaging warns users to put the product on the  outside a sock or glove and to keep the packets away from children, who could get burned more easily. Air-activated hand warmers cannot be re-used once they have stopped heating. How Chemical Solution Hand Warmers Work The other type of chemical hand warmer relies on crystallization of a supersaturated solution. The crystallization process releases heat. These hand warmers dont last as long (usually 20 minutes to 2 hours), but they are re-usable. The most common chemical inside this product  is a supersaturated solution of sodium acetate in water. The product is activated by flexing a small metal disk or strip, which acts as a nucleation surface for crystal growth. Usually, the metal is stainless steel.  As the sodium acetate crystallizes, heat is released (up to 130 degrees Fahrenheit). The product can be recharged by heating the pad in boiling  water, which dissolves the crystals back into the small amount of water. Once the package cools, it is ready to use again. Sodium acetate is a food-grade, non-toxic chemical, but other chemicals can be used. Some chemical hand warmers use supersaturated calcium nitrate, which is also safe. Other Types of Hand Warmers In addition to chemical hand warmers, you can get battery-operated hand warmers and also products that work by burning lighter fluid or charcoal inside special cases. All of the products are effective. Which you choose depends on the temperature you want, how long you need the heat to last, and whether you need to be able to re-charge the product. How to Make a Chemical Hand Warmer Its easy to make a DIY hand warmer using iron, salt, and water in a plastic bag. Materials Iron filingsSalt (sodium chloride)Warm (not hot) waterSand, sawdust, vermiculite, or sodium polyacrylate gelZip-top plastic bags Procedure In a small zip-top bag, mix 1-1/2 tablespoons iron filings, 1-1/1 tablespoons salt, 1-1/2 tablespoons sand (or other absorbent material), and 1-1/2 tablespoons warm water.Squeeze the air out of the plastic bag and seal it.Its a good idea to place the bag of chemical inside another bag, remove the excess air, and seal it.Shake or squeeze the content of the bag for about 30 seconds to mix the contents and form a slush. The bag will get hot and will remain hot as long as the chemical reaction proceeds. If the bag gets too hot to hold, set it down. Dont get burned! Another option is to wrap the bag in a sock or towel. This is an air-activated hand warmer. Even though most of the air is squeezed out, enough remains in the bag for the oxidation reaction. If you closely examine the contents of the bag after the reaction is complete, youll see the iron has changed into iron oxide or rust. This type of reaction cannot be reversed unless energy is added, so the hand warmer cannot be re-used. If you want to prepare a homemade hand warmer for later use, keep the salt and water separate from the iron and filler until youre ready for the reaction to occur. Sources Clayden, Jonathan; Greeves, Nick; Warren, Stuart; Wothers, Peter (2001). Organic Chemistry (1st ed.). Oxford University Press. ISBN 978-0-19-850346-0.Dinà §er, Ibrahim; Rosen, Marc (2002). Thermal Energy Storage (TES) Methods. Thermal Energy Storage: Systems and Applications (1st ed.). John Wiley Sons. ISBN 0-471-49573-5.Hakkin Warmers Co. Ltd. History. www.hakukin.co.jp

Thursday, December 19, 2019

David Moore s On Nature Vs. Nurture - 1230 Words

Ryan Babakhani Anthropology 423 Christina Campbell October 9, 2017 David Moore’s Take on Nature vs. Nurture Traditionally, studies of various organisms have highlighted the importance of genetics as the main determinant of the traits and behaviors that characterize them. This goes back to the Darwinian Theory, which categorized beauty and glamour as results of â€Å"good† genes and the existence of evil and depression as consequences of â€Å"bad† genes. The idea that genes are the critical determining factor of traits and behaviors, and that environmental conditions have little to no effect on the development of these traits, prevailed for several decades within the scientific community. This misconception falls under the umbrella of the nature†¦show more content†¦Moore discusses several examples that weaken genetic determinism: the number of fingers and toes an individual is born with, for example, is has always been assumed to be strictly the result of one’s genetics. However, an alternative viewpoint is that without a healthy genome, or mutation-free genetic environment, an organism’s finger and toe count may vary. Although Moore’s argument does not take away from the significance of studying genetics, it makes a strong cas e for the idea that genes and environment must be considered in conjunction during the analysis of traits and behaviors. Moore offers a great analogy for this pairing, stating that both the wheels and the chain of a bicycle are necessary in order for it to function properly. Nature and nurture are the wheels and the chain of trait-development. Furthermore, diseases that were previously categorized as genetic, and even some that were believed to be caused by a single gene, have been assessed for potential environmental causes that go beyond genetics. In fact, as Moore quoted in his book, the Centers for Disease Control’s panel stated that â€Å"As we acquire more knowledge about the molecular basis of genetic disease, it becomes increasingly clear that variable expressivity (i.e. modification of a genetic trait by other genes or the environment) is the rule rather than the exception† (pp. 23). Combinations of genetic and environmental conditions may contribute to these â€Å"genetic†Show MoreRelatedNature Vs Nurture : Nature Or Nurture874 Words   |  4 Pages Nature or Nurture. Nature may be all of the genes and hereditary factors with which influence them to become who they are such as physical appearances and personality characteristics. Nurturing impacts people’s lives as well as how they are raised and all the environmental factors. In combination, these qualities can be the true identity of oneself. Many people may argue that nurture appears to a play huge factor in the two, but others may think otherwise. 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Christensen H A R VA R D B U S I N E S S R E V I E W P R E S S BOSTON, MASSACHUSETTS 100092 00 i-vi r1 rr.qxp 5/13/11 6:52 PM Page iv Copyright 2011 Jeff Dyer, Hal Gregersen, and Clayton M. Christensen All rights reserved Printed in the United States of America 10 9 8 7 6 5 4Read MoreOrganisational Theory230255 Words   |  922 Pagesmanaging, organizing and reflecting on both formal and informal structures, and in this respect you will find this book timely, interesting and valuable. Peter Holdt Christensen, Associate Professor, Copenhagen Business School, Denmark McAuley et al.’s book is thought-provoking, witty and highly relevant for understanding contemporary organizational dilemmas. 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Wednesday, December 11, 2019

Aztecs Essay Example For Students

Aztecs Essay The Aztec people ruled from the Gulf of Mexico to present day Guatemala. There capital city was Tenochititlan. The greatest controlling force was religion. It was shown in their architecture and sculpture. They also had writing, numbers and a calendar. They had recorded dates for religious holidays. The children were taught respect, courtesy, truthfulness and self control. Aztec boys learned practical tasks from their fathers at home. Then when they reached 15 they went to a youth house. There elders taught the boys religion, citizenship, history, traditions and art. They also learned war. Girls could also learn to be priestesses in temple schools. The Aztecs were divided into tribes that were dived into clans. Each clan had its own officials that represented them at tribal meetings. The land was dived up by the tribes. They controlled the land but the peasants farmed it having to give some of it to the chiefs and priests. The Aztecs worshipped a host of gods that represented nature. To win the gods aid they performed rituals and offered penance. Human sacrifice played an important role. Since life was a mans most valued possession it was the best thing to offer up to the gods. As the Aztec empire grew so did the human sacrifice. Sometimes the Aztecs performed cannibalism, believing they absorb the virtues of the slain. The sacrificed people were thought to be given a high place in heaven. The average Aztec was a farmer. He lived outside the city and grew crops for his tribe. Farming was the most important means of survival due to the warm, humid climate. They lived in small huts. The male was the head of the family. He would often arrange marriages for their children. The language they spoke was the Nahuan language that originated from the west coast of the united states. They wore elaborate colorful clothing made from animal skins that were traded from northern tribes. I personally like the cities they built. The did not have the wheel yet they built some of the most beautiful cities in the world. They were at their prime when the Spanish arrived. They saw their practices and considered them barbaric. They destroyed all but a few records of them and tried to convert them. even though they were almost destroyed the Aztec people live on in present day Mexicans today.Category: History

Tuesday, December 3, 2019

The Island By Gary Paulsen Essays - WIL, , Term Papers

The Island by Gary Paulsen The book I read was The Island by Gary Paulsen. It is about a 15 year old boy named Wil Neuton who moves with his family to northern Wisconsin. There he finds an island on Sucker Lake where he stays to learn about himself. Wil likes riding his bike early in the morning. He also likes watching nature. He is very tall for his age-6 feet 2-but well-built and strong. He is honest,cares about others and prefers to talk things through than resort to violence. The title is good because the book is very much about the island and about Wil finding himself on this island. The island also becomes a very prominent point in Wil's life. By comparison and observation, he learns that all things are connected. An interesting minor character is Emil Aucht. On the morning of his first day in Pinewood Wil wakes up to find Emil staring at him through the window. Emil is an old man with one tooth, no hair and ears that stick out. He chews tobacco and spits brown gunk all over the place. He first appears in the story to request that Wil help him get his car out of the mud. Then Emil reappears to fix the plumbing,wrecking Wil's parents' nerves in the process. The atmosphere in the story is that of a small hick town in northern Wisconsin:open,friendly,relaxed and very laid-back. It strikes me as being very much like "cottage country" in northern Ontario:lakes,forest,fishing,small town life. The time is the late 1980's. The novel ends with Wil seeing that his father is watching him from shore. Wil rows over and finds that his father is tired and sad,his eyes rimmed with red from crying. Wil invites his father over to the island and realizes that this saga will only end when Wil finds an island big enough for his whole family so they can learn what he has learned. I feel that the most interesting part of the book is the beginning of each chapter where there is a paragraph by Wil himself about life and other important pieces of trivia. It offers insight into Wil's personality and gives his views on many subjects. In conclusion,I think this is a good book for people my age. It stresses the importance of knowing who you are and of saving the environment. I enjoyed it and it really made me think.

Saturday, November 23, 2019

April Raintree Reflection Essays

April Raintree Reflection Essays April Raintree Reflection Paper April Raintree Reflection Paper Reflection on April Raintree Novel by Beatrice Culleton April Raintree Reflection: Chapter 1 The first chapter in the novel April Raintree by Beatrice Culleton gives a very intriguing background to April. We learn about her mother, father and most importantly her younger sister April. We are introduced to her living situation and how terrible it is. It is given from the view of a child, leaving the reader to use their common sense to fill in the blanks. I found myself feeling very sorry for April at the beginning of the book, having to raise her sister all by herself because she thought her parents were sick and needed medicine to get better. When her parentâ„ ¢s would take this medicine I just wanted to tell April what was really going on and to go talk to someone. Even though they got taken away from their family during the chapter I still feel terrible. I hate how young Cheryl is, because if she knew what was going on with her family, she wouldnâ„ ¢t be able to understand even if she wanted to. If I were in April or Cheryls situation I donâ„ ¢t think I could cope with all the stress at such a young age. It seemed obvious that they would get taken away from their family, just because the story had to move forward and there had to be conflict but I didnt want it to happen. Nobody wants to be separated from their family, no matter how bad or neglecting they are towards you. Everyone needs someone to love, and be loved back whether they show it or not. I didnt find this chapter the most interesting of the novel, but it kept me interested in the story and kept me flipping the pages. April Raintree Reflection: Chapter 9 In the ninth chapter April has already married Bob and moves to Toronto to move in with him. She is overwhelmed with the parties, mansions and most importantly her complete and total loneliness. Cheryl comes to her house for Christmas and April is excited and nervous for Bobs mothers reaction. They also get a chance to catch up with each other and Cheryl finds out that April went searching for her parents and didnt tell her. I found that this chapter was the turning point for April and Cheryls relationship. Looking back on the novel I feel that it only got worse from this point. This is to be expected because even though they are blood related they were raised in two different families, which allowed them to become two totally different people. Cheryl has been able to live without her sister for a long time, and I think it becomes clear that she doesnâ„ ¢t want to live with April anymore. I think their different opinions about the Native people are a lot more important than the re ader thinks at this time. I think that because it is such a big part of their lives that it hurts Cheryl to see April not care, and hate those people. To Cheryl, itâ„ ¢s like hating yourself, and your heritage. If I were Cheryl, I would probably be just as upset because I would have it written on my face if there was anyone to hate it, it should be the person who is judged all the time with it. April Raintree Reflection: Chapter 11 This chapter is the most intense chapter in the book. April gets raped, and it is described so perfectly to make the reader feel exactly how scared; humiliated and distraught April was during this terrible time. Just thinking about this scene in the chapter makes me want to cringe and scream at the same time. I want to cringe because I hate being a bystander in those situations, but I also want to scream so I can help her and save her because I know how much it is going to affect her life from that day on for the rest of her life. On the news when you here about children that are getting raped, they donâ„ ¢t go into full detail and I now understand why. I canâ„ ¢t imagine how anyone can go to sleep at night with those vicious memories inside their head. It makes me so angry that people would sink so low to hurt someone so terribly emotionally and physically without thinking. Those people should be hurt just as bad because they will never know how those experiences affect the r est of their victimâ„ ¢s life. I have no sympathy for rapists; no matter what their situation is or even if they were threatened. There should be absolutely no reason for someone like this to get away free, and if there is a death penalty this situation should be the ones where they use it. I know this may seem very harsh, but what they did is more than harsh, it is disgusting, disrespectful and just an overall terrible thing to do. I feel so much for April in this chapter and I feel bad judging her because I dont know what its like to have something so traumatic affecting my day to day life. April Raintree Reflection: Chapter 12 In chapter twelve Cheryl apologizes to April for making her go out to get her things, April goes out with Roger and April and Cheryl buy a house together. If I were Cheryl, the guilt I would feel for letting my sister go out into that part of town would never leave me, but I dont think Cheryl saw it as being that bad. I think this because Cheryl was a prostitute and it probably wasnt that abnormal for those things to happen to people walking on the street, especially young women. I was happy that April and Cheryl decided to move in together because I think that at that specific time in their lives they needed emotional support to help them get through. Even though they are both adults at this stage I always think itâ„ ¢s important to have someone to come to just in case there is no one else to turn to and living with your sister would give you that feeling of comfort and security. Although April was the one who just recently gotten raped I still think Cheryl is the dependent one i n their relationship. She comes across as someone who does her own things and marches to the beat of her own drum but I believe that deep down she just wants someone to love her for who she is and will support her through all her decisions. We could automatically put the blame on April for not being a good sister but I think it boils down to Cheryl and how stable she is as a human being. In the novel, Beatrice Culleton makes her come across as stubborn, smart and dependent. We never see Cheryl as being anything but wanting to be with her sister. Later in the novel we find out that she learns to depend on whiskey to solve her problems because she loses faith in her sister. It is hard to judge Cheryls actions because we donâ„ ¢t know what her life was like from her point of view, only Aprils. April Raintree Reflection: Chapter 14 Chapter fourteen mostly takes place in the courtroom where April is questioned about her rape and is forced to answer questions about it, making her uncomfortable and making her relive that terrible evening. Cheryl decides to support her sister by coming to the trial. In the chapter, we find out what Cheryls job was when April was in Toronto. She is a prostitute and they thought it was Cheryl they were raping, not April. When April heard the news, she couldnt force herself to believe it. Its as if her mind went blank and she couldnt process anything else at that moment. Cheryl had told April that it was all her fault from the very beginning, and it turns out that it was true. It says in the book when April asked Cheryl if it was true that Cheryl just sat there and said nothing like she was expecting it. If I were April I wouldve smacked my sister across the face a few times. I wouldnt be able to control my anger. Iâ„ ¢d probably have steam coming out of my ears, Id be so furious. A bit later in the chapter one of the rapists goes to the stand and claims that he was drunk and didnt know what he was doing. I threw the book across the room at this point. I was so upset, and angry with everyone and I felt so bad so April. April has done absolutely nothing to deserve people like this in her life. All she does is try to make her life enjoyable for herself and does what is right for her, which is how everyone should live his or her lives. No one, no matter what his or her situation is, should have those things happen to him or her. Its not something you wish upon someone. Its the last thing you want to happen to anyone, even your worst enemy. April Raintree Reflection: Chapter 15 Chapter fifteen is not too long of a chapter but it certainly has a lot in it. The main event in this chapter is the fight between April and Cheryl. Recently, Cheryl has been drinking quite often and not staying at home either. Cheryl comes home one afternoon completely wasted and says things to April that are so rude and disrespectful itâ„ ¢s hard to imagine that Cheryl is Aprils sister. Cheryl, in the earlier chapters seems like the one who has her head on her shoulders and could stay away from this stuff but I guess she proved us all wrong. It makes me upset to see a girl with such drive and motivation to throw it all away for a bottle of whiskey which only makes her feel that much worse about life. I can understand how she is upset and is going through a hard time but alcohol is not a permanent cure. It might make you feel like everything is okay for a few hours but after, when you pass out and wake up, you are still right where you started and you then realize that nothing ha s gone away. Itâ„ ¢s actually gotten worse because now you have to deal with a major hangover as well. In the end, Cheryl slams the door and walks out. Even though it may seem like this is a good thing I beg to differ because when someone is drunk it is better to take care of him or her instead of letting him or her go on the street where they could be taken advantage. April Raintree Reflection: Chapter 16 When I read this chapter, I cried for a good half an hour. It is so emotional for the reader I cant even describe how I felt reading it. At the end of the chapter when we find out that Cheryl jumped off the bridge just like her mother did, my heart fell into my stomach. I felt like April did. I felt alone, like a part of me has been lost and could never be found again. She was the character you couldnt help but love throughout the whole book, and you just wanted to tell her that so she would rethink this selfish act. Suicide is something that I cannot understand personally because I have never experienced such depression. I cant imagine how the author felt writing this knowing that her two sisters went through this very same thing. I am honestly speechless about this ending. Its so sad that it took death for April to realize what Cheryl had been trying to get across for so long. Cheryl did not deserve this life, or to die this way. I want her to come back to life and change her life for the better but maybe this is the way it was meant to be. Maybe, this is what wouldve happened no matter what path shed taken. Its one of situations that you cant even question, you just have to take a deep breath and let it sink in. April Raintree Overall Reflection At the beginning of the book I had to force myself to read it because I couldnt get into it, but as they started to get older I couldnt put it down. I fell in love with the characters and their differences and how they complimented each other so perfectly. I wish we got to see both sides of the story, from April and Cheryls point of view. However, I think that in order for us to believe Cheryls end result there had to be another side of Cheryl that both April and the reader never see. Its a realistic story which makes it that much spookier. People actually live this life and for people like us, who have food to eat and a stable home life it is impossible to comprehend. It would seem so easy to just leave home if things were bad, but when you grow up in that situation from such a young age it is normal to you. Throughout the book we mostly heard about Aprils story, which I think was used as a distraction from Cheryls life to create more mystery. When I was reading about Aprils fabulou s rich life I was always worrying about Cheryl and what she was up to. She was the underdog that you wanted to come out on top and make a difference just like she said she would when she was younger. I think I lost all hope in Cheryl when later in the book she came home drunk. Seeing anyone you care about loses all control and just not care anymore, makes you worried but also makes you not care anymore. It shouldnt be your responsibility to make someone realize why his or her life is worth living; they should know that by themselves without being told. Even though I lost all hope, I still wished, in the back of my mind that she would surprise me and make me smile like she did when she sent April that letter with all the spelling mistakes in it. This novel clearly shows the ups and downs of living the way these girls did. It showed the constant struggle to succeed and be better than their names, and the colour of their skin. It starts off as such a hopeful book, and in the end is a h opeful book as well. There a lot of events that occur during the novel that make you lose hope but even when Cheryl dies, April find hope, and promises to continue what Cheryl has wanted from the very beginning.

Thursday, November 21, 2019

AC2650 cw2 Essay Example | Topics and Well Written Essays - 2250 words

AC2650 cw2 - Essay Example Every investment comes with different types of risk associated with it. Investors may think that making investments according to the advice of the financial experts are free of risk. But this is not true, as it also comes with various risks. Investors need to understand that to generate wealth over a period of time it needs to accept a high amount of risks. Stock market always fluctuates and it depends on several factors like profitability and performance of the company, political and social factors, and govt. decisions. Share prices of a company always fluctuate due two types of risks – systematic and unsystematic risk. Systematic risks are the market risks and can be measured by beta. On the other side unsystematic risks are those risks which arise from the internal problem of the company like labor problem, problem in managerial decisions and problems in other code of conduct of the company. Unsystematic risks can be measured by alpha. Now we need to consider the various ty pes of risks that are associated with investing in the stock market. There are several types of unreasonable risks that are faced by the investors in the stock market. Evaluating and analyzing the risk that are involved in any investment is very complex. According to the risk taking ability the investors can be differentiated into different category. Risk taking ability of an investor is known as risk portfolio of the investor. There are several types of investors like high risk potential investor, medium risk potential investor and low risk potential investor. Risk tolerance level of an investor depends upon several factors like the age of the investor, objectives of investment, aim of the investment and future goals in life. Thus to discuss about the unreasonable risks we need to consider the several types of risks that can affect the performance of the investors in the stock market. Market risk includes a wider picture which means if an investor wants to