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Silicon

... is the ability to change their resistivity over several orders of magnitude by doping. Semiconductors have electrical resistivities between 10-5 and 107 ohms. Semiconductors can be crystalline or amorphous. Elemental semiconductors are simple-element semiconductor materials such as silicon or germanium. Silicon is the most common semiconductor material used today. It is used for diodes, transistors, integrated circuits, memories, infrared detection and lenses, light-emitting diodes (LED), photosensors, strain gages, solar cells, charg ...

Number of words: 1438 | Number of pages: 6

Design Of A Psychological Experiment

... in your experiment, and any other people you might ask to help? The experimental conditions would be the same for all participants, probably in an indoor stadium so the weather won't affect the students. The task for the experimenter would be to make sure to have a control group, to have a wide variety and different types of participants, to make sure all participants use the same equipment, and have controlled amounts of caffeine. The tasks for the participants would be to carefully follow the instructions of the experimenter ...

Number of words: 470 | Number of pages: 2

Ionic Bond

... recognised by a constant colour or constant mass. The solubility product constant, Ksp is given in the following example: Ksp = [Ag][Cl] Ksp for PbI2 is Ksp = [Pb][I]2 This gives the relationship between the ions in the saturated solution and is the maximum concentration possible without creating precipitation. In this lab, solutions of lead nitrate and potassium iodide will be mixed at a number of dilutions. The reactions will then be observed to see at which point a precipitate no longer occurs. Ksp will then be stated as a range of value ...

Number of words: 536 | Number of pages: 2

The Effects Of Foreign Species Introduction On An Ecosystem

... can cause a shortage of food for native species. When this occurs, the native species disappear and the biodiversity in the ecosystem is reduced. The carrying capacity is also reduced because the ecosystem will not be capable of supporting the same amount of life. If one species hogs the food and does not contribute itself to the food chain, the balance is disrupted and there will be less available for the native species. Once the new species has found its ecological niche however, balance begins to restore itself. When the biodiversit ...

Number of words: 643 | Number of pages: 3

Internet Firewalls

... or software can be developed to do something as fundamental as deny Internet service. Preventing unauthorized access is a cost that should be factored into every Internet equation. What follows is an explanation of Internet security and the concept of Firewalls. What Makes the Internet Vulnerable? Let's look at some of the most common security threats: Impersonating a User or System - To authenticate Internet users, a system of user-Ids and passwords is used. Anyone intent on gaining access to the Internet can repeatedly make guesses unt ...

Number of words: 2823 | Number of pages: 11

Privately Owned Gasoline Powered Vehicles Should Be Limited

... and adults due to lead poisoning. In order to stop this devastation, the use of gas powered automobiles must be limited by replacing them with alternative modes of transportation, or by finding a way to ease them out of utilization. There are many reasons why the number of privately owned gasoline powered cars on the road should be limited. First of all, and most importantly, automobiles are harmful to our environment. Automobiles run on gasoline, which is a mixture derived from petroleum. Gasoline contains hundreds of different hy ...

Number of words: 1770 | Number of pages: 7

Endocrine Disruptors

... their effects. It has been suggested that these hormone changes can, in turn, lead to a variety of health problems including cancer, decreased fertility, and abnormalities in newborns. Evidence provided to support these claims of human and wildlife harm is largely from laboratory studies in which large doses are fed to test animals, usually rats or mice, and field studies of wildlife species that have been exposed to the chemicals mentioned above. In laboratory studies, high doses are required to give weak hormone activity. These doses are n ...

Number of words: 1702 | Number of pages: 7

Blood Pressure

... is sustained over a period of time, it is diagnosed as hypertension. Causes There are two types of hypertension. One is primary hypertension and the other is secondary hypertension. The cause of primary hypertension is unknown. It just happens but however, there are certain risk factors or associations such as hereditary factors, race, age, environmental and life-style factors (where you live, salt and other chemicals, weight, stress, alcohol, lack of exercise). The difference between primary and secondary hypertension is that we know ...

Number of words: 691 | Number of pages: 3

New Developments Or Research In Genetic Cloning: Summary

... to April 1992. These researches are discussed because they all have one thing in common: they may be beneficial to human beings later on. For example, the newest entry in my paper, and perhaps the one that shocked the whole world, was the report about the first successful clone mammal from non-embryonic cells. This will be helpful in the future for patients waiting for organ transplants. Scientists will be able to clone a fully functional organ, and replace it with the damaged one. The report on the cloning of the human's morphine rec ...

Number of words: 2623 | Number of pages: 10

Hemophilia 3

... The level of severity of the disorder breeds true in any given family, which indicates that the phenotypic expression of the disorder reflects the genetic defect. In about 5% of cases, hemophilia-A results from partial deletion of the factor VIII gene, and is severe. Other cases result from a single base mutation in the gene. This can result in nonsense mutations which result in premature stop codons, and a severe expression of the disorder, or missense mutations which cause milder forms of the disorder. In some cases the disorder can ...

Number of words: 660 | Number of pages: 3

Alchemy

... might be considered to contain the first chemical theories; and the theory advanced in the 5th century BC by Empedocles—that all things are composed of air, earth, fire, and water—was influential in . The Roman emperor Caligula is said to have instituted experiments for producing gold from orpiment, a sulfide of arsenic, and the emperor Diocletian is said to have ordered all Egyptian works concerning the chemistry of gold and silver to be burned in order to stop such experiments. Zosimus the Theban (about AD 250-300) discovered tha ...

Number of words: 829 | Number of pages: 4

The Atmospheric Ozone Layer

... of the stratospheric ozone layer could mean greater amount of UV-B radiation would reach the earth, creating among other problems, an increase in skin cancer (melanoma) in humans. As UV-B rays increase, the possibility of interferences with the normal life cycles of animals and plants would become more of a reality, with the eventual possibility of death. Stratospheric ozone has been used for several decades as a tracer for stratospheric circulation. Initial measurements were made by ozonesondes attached to high altitude balloons, by chemi ...

Number of words: 2378 | Number of pages: 9

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