The Discrimination Of Teen Hispanic Discrimination

Teen Hispanic Discrimination There are many stereotypes and racist remarks in today’s world. This essay will specifically be describing the discrimination towards teenage Hispanics. Many Hispanics are discriminated in today’s society. Discrimination and racism can emotionally scar a person. Many Hispanic teens dropout out of high school due to discrimination. Other Hispanic teens gain depression due to discrimination. Several other Hispanic teens even share their own personal stories about themselves being discriminated. Discrimination is an atrocity and this essay will be more of an informative essay to explain the barbarity of racial discrimination, specifically towards teenage Hispanics. I have a personal experience towards this topic so I will be sharing my own personal story towards this issue. Discrimination has become a grave dilemma and there has to be a solution to end this reoccurring situation. Many people see the crimes of racial discrimination occurring ri ght in front of their faces, but they do nothing. Those people who just watch and ignore this grave problem are supporters for this issue because instead of putting an end to racial discrimination, those people just let it occur as if it is normal. I always question myself the same questions repeatedly; who has the right to look down upon a different race? What makes one race superior to another? Why is racism an issue? These are the most interesting questions to me, which makes a person think of today’sShow MoreRelatedAnalysis Of Sandra Cisneros s The House On Mango Street Essay1075 Words   |  5 PagesIn Sandra Cisneros novel The House on Mango Street the characters experience the challenges of growing up in a society full of racism, discrimination, and class distinction. Their experience is exceedingly similar to people in urban areas and cities today. Both the protagonist Esperanza, a young teen and people in today’s hispanic cities experience discrimination ma king progression in life challenging. The indifferent attitudes regarding the importance of education in Esperanza’s world and in today’sRead MoreWhite Backlash Occurred During Nixon s Presidency901 Words   |  4 Pagesunwarranted or disproportionate benefits from the federal government (Jannson, 2015 p. 317). Current Debate The question stands, had the Civil Rights Act of 1964 done what it set out to do? In some cases yes, but in many cases, inequality and discrimination still exist. Most recently, the debate about voter ID laws had made its way into the headlines. Some argue that voter ID laws discriminate against the poor and the growing minority groups. A small group of political scientists found that voterRead MoreAnalysis Of Martin Luther King s Make America Great Again Essay1481 Words   |  6 Pagesstill live in America where many people agree is inequal. According to the Washington Post statistically 61 percent of Hispanics say â€Å"there is a lot of discrimination against blacks† and 71 percent say the same of themselves . These statics are a sense of reminder that our personal experiences have a huge effect on our perspective and our determination to confront discrimination in this country but wistfully very few of us grasp how inequality is happening all around us on a daily base s becauseRead MoreAnalysis Of Mike Brown s Heart Wrenching Story1134 Words   |  5 Pagessuffered the consequences of racial discrimination from a white officer. The dispute between the officer and the teen resulted with a lethal twelve shots being fired at Mike, despite the fact he was unarmed, made no further enhancement toward Wilson, and his hands were raised in surrender. Mike Brown’s heart-wrenching story is just one of the many that occur daily. Racial discrimination is felt among many and it has yet to subside. Prejudices and discrimination occur all over the world and affectRead MoreRacial Issues Of Kill A Mockingbird By Harper Lee1321 Words   |  6 Pagesracial discrimination between Asians and Americans were not as common. The strict segregation and rules that were put in place by the government were horrific and terrible, for example African Americans had to not only go to separate schools and Churches but also separated water fountains, stairs, and some store s. The Tom Robinson case handled racial issues in To Kill a Mockingbird, The Scottsboro Boys, Emmett Till, Trayvon Martin, and Roosevelt’s internment all handled racial discrimination. HarperRead MoreStereotypical Images Of Mexican Americans And Black Americans909 Words   |  4 PagesCollege In today’s society judging races and ethnic groups have left stereotypical images on them. Stereotypical images are seen all over, even in contemporary media. Hispanic Americans and Black Americans are two ethnic groups that I’ve recognized on having that stereotypical image in the contemporary media. Hispanic Americans and Black Americans are left with harm because of these stereotypes that have been shown in the contemporary media, for example in the television shows George LopezRead MoreRacism And The New South Essay1343 Words   |  6 Pagesâ€Å"Becoming ‘Hispanic’ in the ‘New South’: Central America immigrants’ racialization experiences in Atlanta, Ga USA† by Robert A. Yarbrough and â€Å"Allà ¡ en Guatemala† by Lucila D. Ek, Ph.D. they can relate to racism that will eventually end up nowhere just something very negative. Racism is a serious issue, problem that is found pacifically those who migrate to the United St ates because of their appearance so this causes discrimination, ignorance and mistreated. In addition, discrimination has been seenRead MoreRacism in America Essay examples1182 Words   |  5 Pagesthis modern generation. freedom is overrated in the united state. slave has been abolish, racism is over, the civil rights movement ended segregation, so why are color teens been targeted. in the presentation Fourteen Example of Racism in criminal justice system by Fania Halirou. it about how color people including black and hispanic are been treated unfairly by the justice system of America. the us constitution created laws to protect color in america, but this law are been abuse by the same veryRead MoreThe Equal Employment Opportunity Act1119 Words   |  5 Pagesstruggle for minorities to get and keep a job, sometimes due to discrimination. Through this act, Affirmative Action was established to ensure that a certain amount of minorities were able to get a quality education and to get jobs in places that they would have struggled to be employed at before. Affirmative Act ion has helped minorities get the education and jobs that they need. Overall, this system has made up for some of the past discrimination that has affected these minority groups. Affirmative ActionRead MoreWhite Companies And White Faces With White Products White1129 Words   |  5 Pagesinto the blank slate that is considered American. Additionally, social media is the new frontier of business and can either promote or destroy the company s audience with its powerful intellect and the overuse of the â€Å"share† button. Beauty discrimination could not only be seen here in the United States but also in foreign countries as exemplified by China who released an advertisement with the statement, â€Å"Just being white you’ll win†(Chan). White superiority has been tracked back to the very founding

The Crucible Is Still Relevant Today - 1971 Words

â€Å"The Crucible,† a play by Arthur Miller later turned into a major Hollywood movie, explores the politics of fear, social norms, and the fight to recapture a man’s moral compass. Miller paints his story using the small tight knit community of Salem circa 1692 as his canvass, brilliantly weaving historical fact and fiction to portray a scenario not unlike events seen since. The infamous witch hunts of 1692 and wild accusations of a subversive culture that threatened to tear away at the fabric of society are at the center of the film. Originally conceived in the 1950’s during the red scare, it is well known and accepted that Miller sought to highlight the similarities with the ongoing persecutions of accused communist sympathizers. The†¦show more content†¦In the early post-9/11 days, the country was engulfed in paranoia about who would try to destroy their way of life. Middle Easterners were viewed suspiciously any where they went. Prison camp s filled with suspected terrorists sprang up in foreign countries. Bush and his administration were the modern day equivalent of Abigail to some extent. In some ways terrorism was the new communism. Threats from abroad were pounded in to the American psyche. Calls to increase border security, put up a fence along the Mexican border, communities torn between allowing a Mosque to be built or not, questions of allegiance to the State, questions of patriotism: all of this was summed up when Bush exclaimed you were either with us or with the terrorists. Fear was utilized by the Right, just like in the 50’s, to push their agenda. Fear was used by common villagers in â€Å"The Crucible† to get what they wanted and persuade the masses to accept their side of the story over any others. Miller faced a lot of criticism when his play went public. The initial response to Miller’s â€Å"The Crucible† revolved around the charge that â€Å"such an analogy was specious—that there never were any witches but there certainly are Communists† (Miller 160). But it was a flawed argument from the start as Miller points out [In the 17th century, however, the existence of witches was never questioned by the loftiest minds in Europe and America†¦Of, courseShow MoreRelated Why The Crucible Remains Important Today Essay976 Words   |  4 Pages Why ‘The Crucible’ Remains Important Today For a story of any kind to have any relevance or meaning some 50 years after being written and indeed almost 400 years after it was set, it needs to contain themes and ideas that have been uniformly felt and experienced by people from all walks of life as well as continuing to speak to and have meaning to new and changed generations of people. Years after being written, Arthur Miller’s ‘The Crucible’, still successfully speaks to numerous generations ofRead MoreEssay about Why the Crucible Remains Important Today1015 Words   |  5 PagesWhy ‘The Crucible Remains Important Today For a story of any kind to have any relevance or meaning some 50 years after being written and indeed almost 400 years after it was set, it needs to contain themes and ideas that have been uniformly felt and experienced by people from all walks of life as well as continuing to speak to and have meaning to new and changed generations of people. Years after being written, Arthur Millers ‘The Crucible, still successfully speaks to numerous generationsRead MoreTelevision Interview : The Crucible 1118 Words   |  5 PagesRadio Interview: ABC: Good morning Daniel. Welcome to our radio show. D: Thank you for inviting me. It is a pleasure to be here and speak to your audience. ABC: You played the role of John Proctor in the movie, â€Å"The Crucible†. Tell us briefly about your role. D: Well, I play the role of John Proctor, Elizabeth’s husband, as a local farmer who is a stern, harsh-tongued man of high social standing and integrity and who hates hypocrisy. He is a proud man who places great emphasis onRead MoreThe Crucible By Arthur Miller1355 Words   |  6 PagesArthur Miller during the 1950’s, and he proves his point through The Crucible, a play about the Salem Witch Trials. Miller attacks the red scare, which was a time of fear of communism growing in America, and proves the how similar the two events were, and how they are important. As a political allegory of the red scare, Miller’s relatively accurate comparison between the red scare and the Salem Witch Trials through The Crucible demonstrates the theme of subjective reality versus objective realityRead MoreEssay about The Crucible by Arthur Miller981 Words   |  4 PagesThe Crucible was based in 1692 in and around the town of Salem, Massachusetts, USA. 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The story is also a clear extended analogyRead MoreThe Crucible By Arthur Miller1191 Words   |  5 PagesThe Crucible Author s Purpose In the town of Salem in the Massachusetts Bay Colony, a mass of hysteria broke out. It all started in the spring of 1692, when a group of adolescent girls claimed the works of black magic within the village. This ultimately led to a â€Å"series of investigations and prosecutions that caused 19 convicted ‘witches’ to be hanged and many other suspects to be imprisoned† (Salem witch trials 1). Sparked by interest over such a series of tragic event, Arthur Miller produced anRead More Looking at the similarities and context of the plays; The Crucible,1001 Words   |  5 PagesLooking at the similarities and context of the plays; The Crucible, St. Joan and Antigone I shall be comparing the following three plays: The Crucible, St. Joan, and Antigone. 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Passive Design Strategies Achieving Effective Response to Local Climate Free Essays

PASSIVE DESIGN STRATEGIES ACHIEVING EFFECTIVE RESPONSE TO LOCAL CLIMATE Table of contentspage Abstract†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.3 Introduction†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ . Abstraction This survey is aimed at placing the specific inactive schemes that can be applied to edifices in a specific type of local clime to accomplish a proper response to that clime. We will write a custom essay sample on Passive Design Strategies Achieving Effective Response to Local Climate or any similar topic only for you Order Now With edifices being the highest energy consumers and inactive design schemes of major benefit in decrease of energy demand for chilling and warming, the research will bring out the effectivity of the major inactive chilling and heat turning away schemes in supplying thermic comfort and how the pick of these is a effect of the local clime. To accomplish an thorough research, different literature beginnings where used to find a assortment of inactive design schemes that are employed in different climes. From this cognition, the schemes used at the first block of suites at the Belum rain forest resort where identified and their effectivity is established consequently. The first block of suites at the Belum rainforest resort incorporate a big figure of inactive design schemes supplying a wider fluctuation of comparing survey. These when compared to the other blocks at resort will widen the range of the research. Approximately 40 % of family energy is used for warming and chilling to acc omplish thermic comfort. This rate could be cut to about nothing in through sound clime antiphonal inactive designs.. To accomplish high energy efficiency at belum rain forest resort, schemes like Encouraging natural air flow with big gaps and supplying shadowing were used amongst other non as effectual methods. It can therefore be concluded that some inactive design schemes are more effectual than others in specific climes and cognition on this effectivity can drastically better energy efficiency gained due to the usage of these design schemes. Introduction Each clime zone has clearly different design and building demands, This is because within each of these chief zones there are besides many regional sub-zones with differing local conditions features such as air current forms, humidness, temperature and tallness above sea degree. There exists a big figure of inactive design schemes that can be applied to any peculiar edifice. Of these schemes, some are cosmopolitan and would use to about all types of climes but for the most portion each of these clime zones require specific types of inactive design techniques to be applied to edifices in order to be effectual. In add-on to this, in response to the local clime, some of these specific passive schemes are more effectual than others in accomplishing their ends and therefore a grade of precedence can be placed on them for easier design determination devising. Malaysia has high temperatures and a High humidness twelvemonth unit of ammunition, to accomplish edifice sustainability energy usage for chilling has to be minimised, the major factors to see for this clime are the air current and the Sun. Most of the heat addition in the edifices is from the Sun specifically solar heat addition though Windowss and conductivity heat addition through walls. And most of the chilling is by air flow. From this we can clearly detect that the most effectual inactive design schemes are those that control heat addition and supply chilling through air motion. This paper will look into how effectual peculiar inactive design schemes employed to the first block of suites at the Belum rainforest resort in reacting to the local clime by reacting to the undermentioned research inquiries: What is inactive architecture design? What are the inactive design schemes employed to accomplish decrease in heat addition in the first block of suites at the Belum rain forest resort? What are the inactive chilling design schemes employed in the first block of suites at Belum rainforest resort? How make these passive design schemes employed efficaciously respond to the local clime Passive architecture design Harmonizing to†¦Passive architecture design refers to a design attack that uses natural elements, frequently sunlight, to heat, cool, or light a edifice. Every inactive design attack is aimed to maximize comfy conditions for people to populate in, while cut downing the usage of energy and therefore the impact of edifices on the environment. In a physical sense, a inactive design attack is one that will utilize merely locally available energy beginnings like radiation from the Sun, air motion from air currents and temperature differences and use the natural flow waies of that energy to bring forth work. This work is chiefly the warming, chilling and illuming of enclosed infinite and as such inactive design systems will necessitate really small care and cut down a building’s energy ingestion by minimising or taking mechanical systems like pumps and fans used to command indoor temperature and lighting and devour a batch of energy. Passive architecture design is required in order to cut down on the demand for mechanical chilling and warming of indoor infinites. In bend this warming and chilling is required in order to accomplish thermic comfort. Therefore thermic comfort can be regarded as the terminal demand of inactive architecture design together with energy efficiency while accomplishing that. Bs en iso 7730 defines thermic comfort as that status of head which expresses satisfaction with the thermic environment. That is to state the status when person is non experiencing either excessively hot or excessively cold. The chief factors impacting thermic comfort are temperature of the air, humidness, air motion, metabolic rate and vesture. Of these, air temperature ( which is the chief determiner ) , humidness ( which affects evaporative chilling from the human tegument ) and air velocity or motion ( which accelerates vaporization ) are all affected by general environmental factors and can hence be controlled ut ilizing inactive architecture designs. inactive design schemes accomplishing heat addition decrease in the first block of suites at the Belum rain forest resort On this block at the Belum rain forest resort, heat turning away was given extreme importance as the block is extensively shaded and a overplus of heat turning away schemes was used compared to the inactive chilling schemes. The schemes include orientation of the edifice to its site, usage of deep over bents, usage of mesh shadowing devices on Windowss, shadowing of walls and facade, usage of banian sticks to shadow Windowss and usage of flora for shadowing both Windowss and the frontage Orientation This block of suites is oriented in such a manner the longer facade that has the suites and window gaps faces the north-south way with no Windowss on the east-west way. This provides for a shaded in-door infinite during twenty-four hours clip, in this set up, exposure to radiation is minimised as solar radiation is easy controlled by over bents since the high angle of the Sun in the sky in summer makes it easy to shadow Windowss utilizing this while daylighting is maximised cut downing on the demand for unreal lighting in the edifice. Besides in this orientation the eastern and western sides that have no window gaps are exposed to the low-angle summer Sun in the forenoon and afternoon and hence there is less heat addition from these Deep overhangs This block of suites uses a pitched gable to gable type of roof.The usage of a pitched roof provided for deep over bents on the longer frontages. The overhangs On the north and south-facing walls, control direct beam solar radiation. And therefore cut down on the incident heat on the facade and the first floor Windowss. Overhangs are most efficient because being external shading devices, they intercept solar radiation before it has entered through the Windowss or is incident on the walls and therefore even when energy is absorbed by them it is non trapped behind the glass. As the edifice does non precisely face north-south, the over bents are of increased size. This was besides done to efficaciously supply shadiness for both floors of the block. Mesh shadowing on Windowss This shading was extensively applied to all Windowss of this block of suites. This mesh shading placed in forepart of Windowss is considered more efficient than the complete bents chiefly because it is suited and provides shadiness for the Windowss all through the twelvemonth. Unlike the other shading devices, it does non necessitate extended computation to acquire optimum consequences and does non depend on the angle of the Sun. The Mesh besides provides this shadowing while leting for air motion and therefore encourages cross airing. The meshes are made of coated metals as being portion of external shading devices there is demand for the stuff to be upwind resistant. They besides have an added advantage of being flexible to utilize and keep. Banyan sticks cladding The south and north confronting walls of this block are about wholly made of Windowss to advance airing with minimised exposed wall. The entireness of the Windowss and exposed wall is clad in closely arranged banian sticks that farther heighten the shading to the Windowss in add-on to the mesh shading provided. Like the other external shading devices it reduces on the incident heat on the Windowss and the walls. And besides due to their distance from the window radiation energy absorbed by the banian sticks is non re-radiated to the window or wall. They were besides used as a base for vegetive shading. Bing a signifier of perpendicular shading, they have been besides used to shadow the E and west frontages of the block. The banian sticks are treated to accomplish conditions opposition and prevent decay. They have a major disadvantage of cut downing visibleness and natural twenty-four hours light into the edifice The facade of the block was besides constructed in such a manner that the open walls are perpendicular to the way of the facade and as such are wholly shaded by next walls. This design ensures that no external wall is straight exposed to the Sun and as such do non absorb beaming heat. Vegetative shading This was achieved at this block of suites by usage of mounting workss that get support from the banian sticks cladding. With the banyan sticks already positioned to supply shading, the workss are introduced so as to heighten the shadiness provided by the sticks. These workss provide the 3rd and concluding bed of shadowing after the mesh shading and the banian sticks cladding. They cut down solar radiation to every bit low every bit low as 20 % .These together with the banian sticks facade cladding besides work as a clime shield, protecting the edifice from rain and air current bill of exchanges through the Windowss. They besides protect the edifices coloring material and the facade it’s ego from intensive conditions. Plants besides have the added advantage of supplying evapo-transpiration, where, as workss transpire and loose H2O to the ambiance, the vaporization that takes topographic points uses heat energy from the environing chilling it in return. Passive chilling schemes employed in the first block of suites at the Belum rainforest resort. How to cite Passive Design Strategies Achieving Effective Response to Local Climate, Essay examples

THE WITCHES COVE Essays - , Term Papers, Research Papers

THE WITCHES' COVE It was a dark, foggy night. Nothing was stirring, not even a bat. As I walked down the dark street to my friend's house, I saw the old broken-down, tattered Nelson mansion. As I passed the spooky old house, it seemed like a silence fell over the little town of Hallowville. A bone-chilling wave of cold passed through me as I noticed there was a single light burning in the attic of the abandoned house. As my eyes were glued to the glowing attic window, a dark figure passed by the dirty, cracked window. I shivered and begain to walk faster. Suddenly, a ghose-like figure jumped from the bushes and clamped an icy hand over my trembling mouth. The deformed figure roughly began dragging my body, paralyzed with fear, through the wet grass and mud towards the old house. When we reached the front porch, the old wooden stairs squeaked under us and I detected a bitter stench coming from beneath the broken planks of wood. As the front door was pushed open, it creaked on the rusty hinges and I immediately heard moaning voices coming from inside. As my limp body was dragged down a hallway, a musty smell seeped into my nostrils. Suddenly I was dropped on the floor and found myself alone in the dark. I cautiously got to my feet, tested out my wobbling legs and started to inch down the long, dark passage. Suddenly a screeching creature appeared in the air from nowhere, wrapped itself around my face and bared it's sharp fangs at my terrified eyes. I threw it off and ran blindly down the corridor. In the darkness, I did not see the wall that I plunged into face first. As I leaned against the wall, it began to turn, taking me with it int o the darkness. A chilly breeze passed over me and I shivered in the cold. As my eyes adapted to the darkness, I could see a white figure in the corner of the room. I slowly inched my way towards it. Suddenly the white figure lunged towards me, with it's mouth wide open. I clawed at the head of the object and as I made contact with it's face, it disappeared into the darkness. Several moaning voices suddenly encircled me, coming closer and closer until they were joined by the deafening sound of a chain saw engine. Having regained my senses and filled with the determination to escape, I looked wildly around the room. I spotted a faint light in the direction of the moving wall. I screamed at the top of my lungs and lunged toward the light, entering the narrow passage I had come through earlier. I again felt the cold rush of icy air as I passed through the exit and as I ran down the corridor, the smell of musty dirt penetrated my lungs. I reached the front door, flew down the broken front stairs and out into the night. I was finally free! I didn't stop running until I reached the corner where I found my friend standing. She had seen my escape from the house and questioned what I had been doing there. As we walked, she told me all the legends about the Witches' Cove house. I didn't share my entire story with her that night and don't plan to ever reveal everything that went on in the house. Still to this day, I can't be sure if what happened was real, but I will keep my secret and make sure I never pass by that house again.

Inbreeding Depression

Inbreeding Depression Free Online Research Papers There is currently 1.5 to 1.8 million species in the world that have been successfully named and classified. Of this number a vast amount already has, or is in the process of extinction. Loss of habitat, over-exploitation of wildlife for commercial purposes, the introduction of harmful exotic species, environmental pollution, and the spread of diseases pose serious threats to the world’s biological heritage. This is of key concern as the removal of a single species can set off a chain reaction in the ecosystem affecting many others. This is especially true for keystone species, whose loss can transform or undermine the ecological processes or fundamentally change the species composition of the wildlife community. (U.S Fish And WildLife Service, 2005)Is there a method in which these species can be saved from extinction and reintroduced into the wildlife? A zoological garden shortened to zoo, is an institution in which animals are exhibited in captivity. In addition to providing visitors with an entertaining spectacle, modern zoos are also involved with conservation biology (PA, 2005). Conservation biology is the scientific study of the nature and status of the earth’s biodiversity with the aim of protecting species, their habitats, and ecosystems from excessive rates of extinction (Soule, 1986). Zoos meet there conservation role through captive breeding, the process of raising plants or animals in controlled conditions to produce stock for release into the wild, education, research, animal welfare, environmental enrichment, reintroduction and support for in situ conservation of species (F, 2008). Despite many efforts being made into conserving species, there are however some major cons traints faced by zoos in meeting their conservation role while at the same time providing opportunities for the public to learn more about and enjoy nature in artificial forms. One major constraint faced by zoos, is the cost and time to conserve some species. Large species breed at a much slower rates than other species and undergo seasonal breeding and require extensive fostering. An average cost of 1 million dollars in the USA is needed per year/per zoo. Therefore zoos require continued funds by tourism, and other methods in order to keep these species conserved. Other consequences arise within species themselves. Species that are kept conserved in zoos for a long period of time, result in a loss of behaviour in the wildlife, and essentially the species become adapted to zoo life. Species that have been kept in zoos for a long period of time, are in the habit of extensive care and nourishment, and therefore become adapted to living in a predator free environment. However, when let out into the wild, these species have no experience in searching for food and avoiding predators therefore natural selection will select for these traits that are advantageous in captivity, but deleterious in the wild population. A major approach that is taken to conserve an endangered species is inbreeding, which is breeding between closely related species, most often a result of population bottleneck. This is a major comeback for conservation as inbreeding often results to -inbreeding depression which is a reduction in the species fitness, and eventually leads to reductions in genetic variability. In a population where inbreeding occurs most offsprings will have recessive deleterious traits and these traits will be masked by heterozygosity, and so natural selection will select against heterozygote’s. (Lynch, 2005) Inbreeding depression is a major consequence of captive breeding, as seen in species such as Lion population, South China Tiger, and the California Condor. These are just a few out of the numerous numbers of endangered species, which have undergone captive breeding and have been made an attempt at to keep conserved in the wildlife population. In order to illustrate the detrimental effects of Inbreeding depression, Packer et al, 1990 examined the declining lion population in Ngorongoro Crater which is an extinct volcanic caldera located at the western edge of the Gregory Rift. The lion population estimated to be at about 60 to 75 individuals over the period 1957-1961. In 1962 however, the lion population suffered an extraordinary outbreak of Stomoxys calcitrans biting flies that reduced the population to about nine females and one male. (C.Packer, 1991) Because of the drastic reduction in population size, there was extensive inbreeding amongst the survivor species. As examined by Packer et al, 1990 Ngorongoro Crater was largely repopulated by descendents of a group of four females. Each successive cohort of cubs belonging to these four females subsequently became established breeders and mated with only seven breeding males that immigrated to the Crater all during the period shortly after the outbreak. However once the sur viving females had bred successfully, the large coalitions of males prevented any further immigration which further increased inbreeding and therefore levels of heterozygosity subsequently declined by 10 percent. With a decline in levels of heterozygosity there is evidence that shows impaired reproduction in the Crater lions and higher proportion of abnormal sperm, which reduces sperm quality such that it penetrates female eggs at a very low rate. As a result productivity of the Crate population has declined since the 1970’s and as predicted the average levels of heterozygosity in this population will continue to decline in the future in the absence of any male immigration. A similar study of a lion species named Panthera Leo, abundant in Africa suffered population bottle neck due to loss of habitat. (Bjorklund, 2003) And this resulted in reduced genetic diversity which is correlated with reduction in survival. This results in a higher population decline and can increase the rate of extinction. Therefore, as demonstrated by Packer et al, and Bjorklund et al, reduction in population size of a species promotes inbreeding which causes a decline in genetic diversity, and ultimately has detrimental effects on the species. Inbreeding depression has also been observed in the South China tiger, by study done by (Y.C. et al, 2007). The South China Tiger (Panthera Tigris Amoyensis) is a subspecies of tiger native to forests of southern China. Of the currently present 5 tiger species, the South China Tiger is the rarest and the most critically endangered due to factors including hunting, poaching and habitat loss. However one of the most serious threats to tiger’s survival is the use of tiger products in traditional Chinese medicines. The tiger bone is considered to be one of the most valued as a treatment to various conditions. (Tilson, 1997) Due to these factors the individuals declined from a reputed number of 4000 species in 1950’s and continued to decline until the mid 1990’s when the number of free ranging species was estimated to be fewer than 20 individuals(Gilson et al.2004). In the 1950’s however four females and two males were captured from the wild and were used to fo und a captive population. (Y.C.Xu, 2007). Because of the vast decrease in population number, the 6 founder population were enforced to inbreed in the 1970’s and continues to inbreed because of comeback such as their mating behaviour. Female tigers can only mate when they reach maturity at 3 years of age and only in temperate climates seasonally. Because of this only a small number of tigers are able to breed in each generation which lead to inbreeding depression in 1972. As observed by (Y.C.XU et al, 2007) inbreeding depression in the population shows low level of juvenile survivorship due to the loss of genetic variation and because of this infants were not able to adjust to the changing environmental conditions. Also because of low fertility and fecundity, reproductive difficulties were observed amongst the species. As a result the small number of founders and inbreeding depression contribute to a major challenge of conserving the South China Tiger. Inbreeding depression has also occurred in the wild population of the California Condor that ranged from British Columbia to Baja California in the 19th century (Vickey, 2000). During that time period, the species faced dramatic population decline caused by high mortality rates due to exploitation, habitat destruction and the most prominent factor lead poisoning. It wasn’t until the 1987, that all the remaining population of 27 individuals of which 14 were males and 13 are females were captured and brought into captivity. (Phillip, 1995) Due to the small population size, there was extensive inbreeding which led to the loss of genetic variation and changes in allele frequency. The population also harvested a vast amount of deleterious recessive alleles, which are usually depleted of the population by natural selection. Before the decline in the Condor population there is much genetic variability, and therefore recessive deleterious alleles are hidden from natural selection by d ominant alleles. However when the population declined, and inbreeding was enforced, close relatives that mate one another likely carry the same recessive deleterious alleles. Accordingly when relatives mate the offspring may inherit two copies of the same recessive deleterious allele expressing it. According to the study conducted by (Ralls et al. 1999), captive flocks had produced five deformed embryos that exhibited Chondrodystrophy, and died near the time of hatching. Chondrodystrophy, a recessive deleterious allele in chickens, is a condition where the abnormal development of cartilage affects bone growth before birth, and eventually leads to dwarfism. Chondrodystrophy in birds can be caused by a variety of factors such as mycoplasma infections and dietary deficiencies, particularly of manganese. (Ralls et al. 1999). Therefore inbreeding depression exposes Chondrodystrophy in offsprings, which results in a high mortality rate and ultimately reduction in population and stability of species extinction. Other species that are affected by recessive deleterious alleles caused by inbreeding are Golden Lion Tamarin’s (Leontopithecus rosalia rosalia). According to study done by (Bush et al. 1996), Golden Lion Tamarin’s are native to the forests of Brazil and are widely endangered with a captive population originating in 1982 due to extensive deforestation. The current captive population of 494 individuals underwent inbreeding, which resulted Diaphragmatic defects, a disease caused by recessive deleterious alleles. A diaphragmatic defect is a rare syndrome characterized mainly by a defect in the diaphragm that allows some of the abdominal organs to move into the chest cavity, and involved missing or formation of abnormal bones in the arms or legs. (M., 1980) Therefore inbreeding depression was observable in the Lion population and posed major consequences. As seen in the California Condor and Golden Lion Tamarin, low genetic diversity caused by reduction in population will result in inbreeding depression. This will unmask of recessive deleterious alleles in the offsprings of the parental generation, and will result in the depletion of these individuals due to natural selection. Today, more species are alive on the planet than ever before. Estimates place the number of species between 10 to 100 million, with only 1.5 to 1.8 million identified with Latin names (Lacy, 1997). Of this number studies indicate that 2 to 3 species are going extinct yearly due to a wide number of reasons such as exploitation, habitat destruction, pollution, global warming, introduction of exotic species, and the spread of diseases. Why should we initially care about species going extinct? Major concern isn’t about extinction of a single species, but rather the ecosystem it belongs to, and the interaction with other species. Some species play a vital role in there ecosystem, that if lost due to extinction, it could affect a numerous number of species. Zoos across the world now hold a major role in conserving these species. Species that are headed towards extinction are captured from the wild and placed in zoos in which they are provided an artificial habitat much like their ow n. With the rather small population of species, professionals employ captive breeding amongst them. It is the process of capturing animals from the wild and mating them in captivity in order to increase the number of species under protected conditions. (Waugh, 1988) Despite many species that have been reintroduced into the wild as a result of captive breeding, there is a downfall. Firstly, captive breeding programs focuses only on a few charismatic endangered species, and neglects the numerous number of other species that are in the process of extinction. It is also very costly to train individuals to capture species from the wild, and provide them with their mimicry habitat and other resources they require. A major consequence faced by conservation however, is inbreeding depression seen in species that mate relatives, or siblings. Major consequences of Inbreeding depression are seen in the Lion population, South China Tiger, and California Condor. Because of their relatively small population due to factors such as habitat destruction, these species were captured from the wild, and had gone through inbreeding. A major consequence of inbreeding is the reduction in fitness and the loss of genetic diversity. As the closely related species kept on inbreeding within themselves, it was only those alleles that were being expressed. With a loss of genetic diversity, offsprings of those individuals are not able to withstand the changing environment. Other consequences of inbreeding seen in California Condor, is the expressivity of a recessive deleterious allele. The offsprings exhibited diseases caused by these recessive alleles. Hence, when a population undergoes a bottleneck affect, most zoos try a technique commonly knows as inbreeding to try and preserve a species. Inbreeding also has its consequences as it is apparent in the three species discussed above. The most direct effect of inbreeding is inbreeding depression as it causes a reduction in population number. Research Papers on Inbreeding DepressionGenetic EngineeringRelationship between Media Coverage and Social andIncorporating Risk and Uncertainty Factor in CapitalInfluences of Socio-Economic Status of Married MalesPETSTEL analysis of IndiaOpen Architechture a white paperNever Been Kicked Out of a Place This NiceDefinition of Export QuotasQuebec and CanadaThe Effects of Illegal Immigration

Baggie Chemistry Experiments

Baggie Chemistry Experiments Overview An ordinary ziploc bag can unlock a world of interest in chemistry and in the reactions within and around us. In this project, safe materials are mixed to change colors and produce bubbles, heat, gas, and odor. Explore endothermic and exothermic chemical reactions and help students develop skills in observation, experimentation, and inference. These activities are targeted for students in grade 3, 4, and 5, although they may also be used for higher grade levels. Objectives The purpose is to generate student interest in chemistry. Students will observe, experiment, and learn to draw inferences. Materials These quantities are suitable for a group of 30 students to perform each activity 2-3 times: 5-6 plastic ziploc-style bags per lab group5-6 clear plastic vials or test tubes (may be used instead of baggies)1 gallon bromothymol blue indicator 10-ml graduated cylinders, one per lab groupteaspoons, 1-2 per lab group3 pounds calcium chloride (CaCl2, from chemical supply house or from store selling this type of road salt or laundry aid)1-1/2 pounds sodium bicarbonate (NaHCO3, baking soda) Activities Explain to the students that they will be performing chemical reactions, making observations about the results of these reactions, and then designing their own experiments to explain their observations and test hypotheses that they develop. It may be helpful to review the steps of the scientific method. First, direct the students to spend 5-10 minutes exploring the lab materials using all of their senses except taste. Have them write down their observations regarding the way the chemicals look and smell and feel, etc.Have the students explore what happens when the chemicals are mixed in baggies or test tubes. Demonstrate how to level a teaspoon and measure using a graduated cylinder so that students can record how much of a substance is used. For example, a student could mix a teaspoon of sodium bicarbonate with 10 ml of bromothymol blue solution. What happens? How does this compare with the results of mixing a teaspoon of calcium chloride with 10 ml of indicator? What if a teaspoon of each solid and the indicator are mixed? Students should record what they mixed, including quantities, the time involved to see a reaction (warn them that everything will happen very fast!), the color, temperature, odor, or bubbles involved... anything they can record. There should be observations such as:Gets hot Gets coldTurns yellowTurns greenTurns blueProduces gasShow students how these observations can be written down to describe rudimentary chemical reactions. For example, calcium chloride bromothymol blue indicator heat. Have the students write out reactions for their mixtures.Next, students can design experiments to test hypotheses they develop. What do they expect to happen when quantities are changed? What would happen if two components are mixed before a third is added? Ask them to use their imagination.Discuss what happened and go over the meanings of the results.

A New Empirical Model for Predicting the Sound Absorption of Polyfelt Article

A New Empirical Model for Predicting the Sound Absorption of Polyfelt Fibrous Materials for Acoustical Applications - Article Example Empirical models do not require detailed knowledge of the internal structure of the material nor are they derived from theoretical considerations. Delany and Bazley [1] showed that the values of the characteristic acoustic impedance and propagation coefficient for a range of fibrous materials, normalized as a function of frequency divided by flow resistivity could be presented as simple power law functions. Model for Impedance The model is based on numerous impedance tube measurements and is good for determining the bulk acoustic properties at frequencies higher than 250 Hz, but not at low frequencies [2,3]. The validity of this model for lower and higher frequencies was further extended by Bies and Hansen [4].Dunn and Davern [5] calculated new regression coefficients between characteristic acoustic impedance and propagation coefficient for low airflow resistivity values of polyurethane foams and multilayer absorbers. To that effect, engineers can obtain the absorption coefficient of sound at normal incidence by using the equation below: ZR = P0 * C0 (1 + C1 ((P0f)/r)-c2) The final model which comes as a derivative of the first model is Zt = (ZR + iZl)[coth(a + iB) * l] Zt = ZIR + iZIl Qunli [6] later extended this work to cover a wider range of flow resistivity values by considering porous plastic open-cell foams.Miki [7, 8] generalized the empirical models developed by Delany and Bazley for the characteristics acoustic impedance and propagation coefficient of porous materials with respect to the porosity, tortuosity, and the pore shape factor ratio. Moreover, he showed that the real part of surface impedance computed by the Delany’s model converges to negative values at low frequencies. Therefore, he modified the model to give it real positive values even in wider frequency ranges. Other empirical models include those of Allard and Champoux [9]. These models are based on the assumption that the thermal effects are dependent on frequency. The models wor k well for low frequencies. The Voronina model [10] is another simple model that is based on the porosity of a material. This model uses the average pore diameter, frequency and porosity of the material for defining the acoustical characteristics of the material. Voronina [11] further extended the empirical model developed for porous materials with rigid frame and high porosity, and compared it with that of Attenborough's theory. A significant agreement was found between their empirical model and Attenborough's theoretical model. Recently, Gardner et al. [12] implemented a specific empirical model using neural networks for polyurethane foams with easily measured airflow resistivity. The algorithm embedded in the neural networks substitutes the usual power-law relations. The phenomenological models are based on the essential physics of acoustic propagation in a porous medium such as their universal features and how these can be captured in a model [13]. Biot [14] established the theo retical explanation of saturated porous materials as equivalent homogeneous materials. His model is believed to be the most accurate and detailed description till now. Among the significant refinement made to Biot theory, Johnson et al. [15] gave an interpolation formula for â€Å"Dynamic tortuosity† of the medium based on limiting behavior at zero and infinite frequency. The dynamic tortuosity employed by Johnson et al. is equivalent to the structure factor introduced by Zwikker and Kosten [16] and therefore