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Free research papers and essays on topics related to: surface area

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  • Alzheimers Disease : Neurobiology, Causes And Treatments Of - 960 words
    Alzheimers Disease : Neurobiology, Causes And Treatments Of Alzheimers disease : Neurobiology, causes and treatments of Alzheimer's Disease (AD) is one of the most common of the dementing illnesses. A progressive, degenerative disease that attacks the brain, causing impaired memory, thinking and behavior. A person with Alzhiemers Disease may experience personality and behavior changes, impaired judgment, confusion and difficulty finishing thoughts, following directions or even finding the right word to say in a conversation. Once advanced the sufferer may require a caretaker as daily chores become very difficult to accomplish. Evidence points toward amyloid as one of the main causes for the ...
    Related: alzheimer's disease, alzheimers disease, diagnosis treatment, main causes, nitric oxide
  • Alzheimers Qa - 932 words
    Alzheimer's Q&A Alzheimer's Disease and Related Disorders Assoc. Inc. 70 E. Lake Street, Suite 600 Chicago, Illinois 60601 What is Alzheimer's Disease? The most common form of dementing illness, Alzheimer's Disease (AD) is a progressive, degenerative disease that attacks the brain, causing impaired memory, thinking and behavior. The person with AD may experience confusion, personality and behavior changes, impaired judgment, and difficulty finding words, finishing thoughts or following directions. It eventually leaves its victims incapable of caring for themselves. What happens to the brain in Alzheimer's Disease? The nerve cells in the part of the brain that controls memory, thinking, are d ...
    Related: chicago illinois, aging process, men and women, nerve, tissue
  • Balsawood Structure Design 1 Introduction: This Report Is The First Stage Of The Design, Construction And Testing Of A Balsa - 1,185 words
    ... nding behavior in each test. The two sets of data taken for this test varied greatly (as much as 300%), and therefore this data is likely to be very error prone. Figure 3: Three Point Bending Specimen Table 3: Bending Data Specimen # Rupture Load (lb) Elastic Modulus (lb/in) 1 26.6 120,000 2 62.5 442,000 Included in the Appendix is a graph of load versus displacement for the first test, it shows how the experiment was flawed at the end when the material hit the bolt which was sticking out of the machine, thus causing stress again. It also shows the slope from which the elastic modulus of the material was taken. Ideally, four point bending tests should have been performed, where the mater ...
    Related: construction, structure design, testing, information available, surface area
  • Bibliography: This Is My First Biology Paper My Major Is Psychology I Attend An University In Maryland Parttime I Am A Colleg - 1,764 words
    Bibliography: This is my first Biology paper. My major is Psychology. I attend an university in Maryland part-time. I am a college Sophomore. I work in Communications. UNDERSTANDING THE AIDS VIRUS Will I live to see tomorrow? Is there a hope for the future? These are probably the most commonly asked questions among AIDS patients today. This paper delves into the heart of the AIDS topic by giving a detailed definition of the virus, risk factors associated with transmission, and the best treatment methods studied by the Centers for Disease Control, the National Institutes of Health, and other research organizations. AIDS. The word alone strikes fear into every sexually active individual. Why i ...
    Related: attend, biology, maryland, psychology, san francisco
  • Black Holes - 1,516 words
    ... n in space. At this exact point in time, high amounts of radiation are given off, and with the proper equipment, can be detected and seen as an image of a black hole. Through this technique, astronomers now believe that they have found a black hole known as Centaurus A. The existence of a star apparently absorbing nothingness led astronomers to suggest and confirm the existence of another black hole, Cygnus X1. By emitting gravitational waves, non-stationary black holes lose energy, eventually becoming stationary and ceasing to radiate in this manner. In other words, they decay and become stationary black holes, namely holes that are perfectly spherical or whose rotation is perfectly uni ...
    Related: black hole, black holes, theory of relativity, stephen hawking, uniform
  • Blaise Pascal - 1,504 words
    Blaise Pascal Blaise Pascal was born in Clermont France on June 19, 1623 to Etienne Pascal. His mother died when he was only 3. He was the third of four children and the only boy. He was described as a man of: small stature, poor health, loud spoken, somewhat overbearing, precious, stubbornly persevering, a perfectionist, highly pugnacious yet seeking to be humble and meek. Pascal's father had somewhat unorthodox views on education, so he decided to teach his son himself. He forbade any mathematic teachings or material to be given to him and had any such texts removed from their house. Blaise became engulfed with curiosity due to this rule. He started to work with geometry on his own at the ...
    Related: blaise pascal, pascal, religious experience, health problems, copy
  • Bridges - 519 words
    Bridges REASEARCH PAPER Bridges have been around sense the beginning of time. The Ancient Roman engineers used two significant innovations, the cofferdam and cement. The cofferdam is when the put wooden spikes in to the bottom of the river then used watertight clay over the spikes to make a bridge. Now today there are more efficient ways to make a bridge then just out of cement and clay. There are Suspension Bridges, Arch Bridges, Covered Bridges and many more. Suspension bridges have become a very common method of bridge construction in the last century. For example the Brooklyn Bridge, George Washington Bridge, Golden Gate Bridge and the Verrazano-Narrows Bridge. These bridges all use the ...
    Related: bridges, surface area, ancient roman, different types, clay
  • Cd Recording - 1,974 words
    Cd Recording CD recording has become increasingly popular for a number of reasons. For one, they are extremely cheap. With a mail in rebate it's possible to get them for ten cents a disk. A lot of that is due to the simplicity in design. They're slim. Which means they can be carried easily. A CD can store a vast amount of data. You could put the same information on one CD that it would take hundreds of floppies to hold. CD's can be used in a wide variety of components. You can play them in your car stereo, on your home stereo, on your computer, in your DVD player, or even game consoles. This site was designed to help clear up some of the confusion that has to do with recording CD's. We are g ...
    Related: recording, good thing, dvd player, surface area, utilize
  • Cells Of The Human Body - 2,204 words
    ... lum of skeletal muscle stores calcium ions that function in muscle contraction. GOLGI APPARATUS The Golgi apparatus is composed of flattened membranous sacs, containing cisternae, that are stacked on each other like dinner plates. The Golgi apparatus modifies, packages, and distributes proteins and lipids manufactured by the rough and smooth endoplasmic reticula. Proteins produced at the ribosomes of the rough endoplasmic reticulum are surrounded by a vesicle, or little sac, that forms from the membrane of the endoplasmic reticulum. The vesicle moves to the Golgi apparatus, fuses with the membrane of the Golgi apparatus, and releases the protein into the cisterna of the Golgi apparatus. ...
    Related: blood cells, cell division, human body, white blood cells, health care
  • Circulatory System - 1,361 words
    CIRCULATORY SYSTEM (A) FORMATION OF TISSUE FLUID AND EXCHANGE OF MATERIALS IN THE CAPILLARY NETWORK In a capillary network, two opposing forces mainly determine the movement of fluid between the blood and tissue fluid: (1) the hydrostatic pressure difference and (2) the osmotic potential difference between the blood and the tissue fluid. In the part of the capillary network near the arterial end, blood pressure is much higher than that of the tissue fluid so that the difference in hydrostatic pressure exceeds the osmotic difference between the two fluids. As a result, some plasma is filtered out of the capillaries under pressure into the tissue space to form tissue fluid. As blood moves alon ...
    Related: circulatory, circulatory system, surface area, bone marrow, narrow
  • Collision Aviodance - 1,336 words
    Collision Aviodance Collision Avoidance: ADS-B or TCAS March 7, 2000 INTRODUCTION Background Collision avoidance is something that has been a problem in aviation for a long time. Most of the flights conducted today rely on the see and avoid concept and ground radar. Both of which have their flaws. The FAA predicts that mid-air collisions will increase by 300% over the next 20 years due to the increase in flights being flown by all areas of the aviation community (Kraus xiv). Civil aircraft have had onboard protection from midair collisions only since 1990 and general aviation aircraft are not required to have any collision avoidance technology onboard(www.cassd.org 1). In order to effectivel ...
    Related: collision, surface area, introduction background, traffic control, aircraft
  • Combustion Carbon Dioxide - 1,127 words
    ... carbon dioxide plus carbonic acid. The carbonic acid can neutralize hydroxide ions which if added, would increase the pH of the blood and cause alkalosis. The bicarbonate ion can neutralize hydrogen ions that, if added, would cause a decrease in the pH of the blood and lead to acidosis. Both changes in pH are life threatening. The carbon dioxide in the earth's atmosphere helps regulate the planet's temperature. When sunlight reaches the earth, some of it is converted into heat. The carbon dioxide absorbs some of the heat and so helps keep it near the earth's surface. If all the heat from the sunlight escaped into outer space, the earth would become very cold. The amount of carbon dioxid ...
    Related: carbon, carbon dioxide, carbon monoxide, combustion, dioxide
  • Comets - 1,209 words
    Comets The first written records of comets date back to nearly 3,000 years ago from China and Europe. The accounts of these comets were believed to be the causes of terrible events that occurred afterwards. In more recent times, however, astronomers have found out what they really are. A comet is basically a mixture of ices, from both water and frozen gases, and dust. They have also been given the names dirty snowballs or icy mud balls. The typical comet is less than 10 kilometers across. They spend most of their time frozen solid in the outer parts of our solar system. Comets are composed of five parts: the nucleus, coma, hydrogen cloud, dust tail, and ion tail. The nucleus is pretty solid ...
    Related: comets, solar wind, magnetic field, total number, decrease
  • Crime Netherlands - 670 words
    Crime Netherlands Over the years, there has been much discussion regarding the relationship between crime and religious sects. How were crime justified? Where and how were the robberies committed? In the article Crime in the Netherlands in the sixteenth century Janzma studies the issue of robbery in relation to the Appelman-Batenburg group and the followers of Johan Willems by exploring the socioeconomic and political conditions responsible for their survival. According to the author, the Appelman-Batenburg sect was more organized than most since they had organized a criminal network of spies, locksmiths and goldsmiths. This would ensure that the loot would be well hidden and new operations ...
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  • Deserts - 357 words
    Deserts A desert is an area defined by it has less than 50 cm of precipitation annually. Not all deserts are dry and sandy.Most of the worlds deserts tend to lie between 20 degrees to 30 degrees north and south latitude. North Africa, south western North America, the Middle East, and Australia support the largest deserts, but there are smaller deserts in other regions. Overall deserts cover one fifth of the earths surface.Hot desert climates are hot and dry, with high temperatures, usually around the 45 degrees Celsius mark which inturn with the low rainfall makes life in the desert very hard to support. At night the temperature can drop to around 18 degrees Celsius. With the hot deserts hig ...
    Related: deserts, north africa, south western, surface area, evaporation
  • Earth Planet - 2,166 words
    Earth Planet The Earth, man's home, is a planet. The Earth has special characteristics, and these are important to man. It is the only planet known to have the right temperature and the right atmosphere to support the kind of environments and natural resources in which plants and man and other animals can survive. This fact is so important to man that he has developed a special science called ecology, which deals with the dependence of all living things will continue to survive on the planet. Many millions of kinds of plants and animals have developed on Earth. They range in size from microscopic plant and animals to giant trees and mammoth whales. Distinct types of plants or animals may be ...
    Related: planet, northern hemisphere, mount everest, solar radiation, gravity
  • Egyptian Pyramids - 1,546 words
    Egyptian Pyramids The Egyptian pyramids have been the subjects of many outlandish claims and construction theories for centuries. The Great Pyramid for example has been associated with pyramid power, curses, Atlantis, the Bermuda Triangle, Biblical prophecy, Martian faces, advanced civilizations, space aliens, cavity resonators, and even levitation. It is not surprising that some that have proposed such theories have been dubbed pyramidiots. This paper will attempt to give a more logical solution to the methods ancient Egyptians may have had used, and the problems they may have had, using factual information, scientific evidence and a bit of common sense. It is time for a rational explanatio ...
    Related: egyptian, egyptian pyramids, great pyramid, pyramids, assembly line
  • Elephant - 1,701 words
    Elephant The common name is the African Elephant, the scientific name is Loxodonta Africana, the phylum is Vertebrata, the class is Mammalia, the order is Proboscidea, and the family is Elephantidae. The Closest Relatives to the African Elephant are: the Asian Elephant, mammoths, primitive proboscidean (mastodons), sea cows, and hyraxes. Scientists believe that the African Elephant evolved from one of its closest relatives, the Sea Cow. The geographical location and range of the African elephant covers all of central and southern Africa. In Ethiopia there are isolated populations that exist around Lake Chad in Mali and Mauritania. Also in Kenya, Rhodesia, Tanzania, Zambia, Uganda, Zaire, and ...
    Related: elephant, national parks, surface area, south africa, feature
  • Eukaryotic Organelles - 324 words
    Eukaryotic Organelles The mitochondria has an eggshape structure. The mitochondria consists of an inner and outer membrane. The outer membrane is what shapes the organelle to its egglike shape. The inner membrane which folds inward makes a set of "shelves" or cristae that allow the reactions of the mitochondria to take place. The more the mitochondria makes these reactions the more the inner membrane folds. This happens because the mitochondria now has more surface area connecting it to its surroundings. The processes that the mitochondria make are to break down the high energy organic molecules into smaller more useful packages. The endoplasmic reticulum is a network of tubes and channels t ...
    Related: eukaryotic, surface area, smooth, organic
  • Evolution Of Man - 1,787 words
    Evolution Of Man The evolution of man is an area of study that will never fully be understood, however, evidence has been accumulated to allow us to paste together a picture of what happened in the beginning of time. It allows us to gather an idea of how man progressed to exist in the state in which we see him now. We can see that the evolution of man was directly influenced by his environment. Man's intellectual development directly effected the physical changes that we see. It is apparent through observation that the environmental changes also induced some of the physical changes that man underwent. These environmental changes and seemingly intellectual development slowly refined man's beh ...
    Related: evolution, human evolution, homo habilis, physical development, wind
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