Science
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4,609 Essays on Science. Documents 2,191 - 2,220
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Hydrocarbons
Formation of Hydrocarbons Types of hydrocarbons Parameters for hydrocarbon accumulation Phases of alteration of organic matter Types of kerogen Migration of hydrocarbons Five Major Types of Hydrocarbons Kerogen: Kerogen is a fine-grained, amorphous organic matter. It is not soluble to normal petroleum solvents, like carbon disulfide. Its chemical composition is 75% C, 10% H, 15% other (sulfur, oxygen, nitrogen, etc.). It is very important in the formation of hydrocarbons because it is what generates oil
Rating:Essay Length: 509 Words / 3 PagesSubmitted: November 15, 2009 -
Hydroelectric Power Plants
Electricity which is generated by using the force created by flowing water is usually called hydroelectric power. In most cases hydroelectric power plants are installed at the base of huge dams where the reservoir supplies ample amounts of water to power the turbines. The water from the storage reservoir of the dam is brought to the turbines thorough large steel pipes called penstocks. By the time water has reached the turbine, it has gained a
Rating:Essay Length: 359 Words / 2 PagesSubmitted: April 23, 2017 -
Hydroelectric Vs Nuclear Power
Together nuclear power plants and hydroelectric dams provide about 50% of the power generated for the United States doing so in a clean and efficient manner. Both systems have their ups and down, radiation and disrupting ecosystems for example, but their benefits far outweigh the small risks and problems they create. We have progressed in leaps and bounds in power development making these two much safer and efficient than most other ways to generate electricity.
Rating:Essay Length: 723 Words / 3 PagesSubmitted: May 10, 2010 -
Hydrogen
Hydrogen Hydrogen is a tasteless, odorless, colorless gas. Hydrogen is found in group 1 and period 1 on the periodic table. Hydrogen is classified as a nonmetal on the periodic table. The symbol for hydrogen is represented by an H, its atomic number is 1, and its atomic weight is 1.0079. The hydrogen atom consists of one proton, which has a positive charge, and one electron, which has a negative charge. The term hydrogen comes
Rating:Essay Length: 596 Words / 3 PagesSubmitted: November 28, 2009 -
Hydrogen Cars
Hydrogen Automobiles The effect of pollution that is emitted from vehicles is a serious concern in today’s society. The cause of this pollution is the toxic emissions from current vehicles. This toxic emissions or pollution destroys the Earth’s ozone layer or atmospheric gases Acknowledging these facts, many are very concerned with the condition of the Earth’s atmospheric gases in the future. In just a very short time, scientists produced a new vehicle which only
Rating:Essay Length: 1,531 Words / 7 PagesSubmitted: March 19, 2010 -
Hydrogen Power
Hydrogen could be the solution to the world’s energy problem. Hydrogen is nothing new, and in fact it is a large and growing industry. The growth rate for hydrogen consumption is around 10% per year. Within the United States, production was about 11 million metric tons, which in turn created 48 gigawatts of energy. This energy source was about 9% of America’s electric production in 2003. (The total electric production in 2003 was 442 gigawatts.)
Rating:Essay Length: 1,434 Words / 6 PagesSubmitted: November 18, 2009 -
Hydrogen Power
Why are we as Americans so afraid to change? Even if it is a change for the better? The world has been using oil coal and other petroleum products to power just about everything that moves for the last 150 years. Yet most cars in the United States only get 10-20 miles a gallon and even the "good" ones can get only a petty 20-50 miles a gallon. So why do we put up
Rating:Essay Length: 830 Words / 4 PagesSubmitted: December 12, 2009 -
Hydrogen Power as a Fuel Source
It is no secret that the Gulf war was fought for superiority of the vast oil reserves in the Arab regions. This point to the fact that the superpowers are experiencing a severe shortage of fuel for its un-satiated energy needs. While the advanced nations in the world are the biggest consumers of fuel, their fuel production capacities are very limited or almost non-existent. Scientists predict that the world's oil reserves will not last
Rating:Essay Length: 997 Words / 4 PagesSubmitted: November 19, 2009 -
Hydrolysis of Oxoanions
Hydrolysis of Oxoanions Nonmetals in positive oxidation states do not exist in aqueous solution as cations but rather as hydroxides or oxides. These species often act as oxo acids which ionize to form oxoanions in solution. The general form of an oxoanion is MOxy-. Since these oxoanions are quite different in their properties, Z2/r ratios for nonmetal cations do not give accurate predictions of their chemical behavior. A different approach is needed to determine
Rating:Essay Length: 1,511 Words / 7 PagesSubmitted: May 4, 2010 -
Hydroponics: Advantages of Producing Crops Through Use of Hydroponics
Hydroponics: Advantages of Producing Crops Through Use of Hydroponics HYDROPONICS derives its name from the Greek HYDRO-PONOS meaning water/labor. Literally, "Hydroponics" means "Water Work." There is no soil in a hydroponic garden. No organic matter is present so nourishment (Nutrient) is not available to the plants in the same was as it is in a soil garden. Instead, nutrients are added to the water. So, as plants are watered, they are also fed. There are
Rating:Essay Length: 312 Words / 2 PagesSubmitted: January 31, 2010 -
Hydropower
Hydropower From Wikipedia, the free encyclopedia Jump to: navigation, search Undershot water wheels on the Orontes River in Hama, Syria Saint Anthony Falls Energy Portal Hydropower is the capture of the energy of moving water for some useful purpose. Prior to the widespread availability of commercial electric power, hydropower was used for irrigation, milling of grain, textile manufacture, and the operation of sawmills. The energy of moving water has been exploited for centuries; in Imperial
Rating:Essay Length: 1,479 Words / 6 PagesSubmitted: November 21, 2009 -
Hydropower Renewable Energy
Renewable Energy (Hydropower) The first time hydropower was used was in 1880 to generate 16 lamps at a wolverine chair factory in Grand Rapids Michigan. In the United States, hydroelectric plants opened near Appleton, Wisconsin on the Fox River on September 30, 1882. At that time, the only fuel used to make electricity was coal because of its abundance and low cost. People knew about hydroelectric power but the only places you could do
Rating:Essay Length: 414 Words / 2 PagesSubmitted: November 9, 2009 -
Hydrothermal Vents
In the late 1970's, scientists on a regular study of the ocean floor in the Pacific Ocean made a discovery that would stun the entire scientific community. On the East Pacific Rise not far from the Galapagos Islands, nearly 8000 feet below the surface, was a strange landscape covered with what looked like underwater chimneys secreting clouds of black smoke. Surrounding these chimneys was a unique type of ecosystem that had never been seen before.
Rating:Essay Length: 910 Words / 4 PagesSubmitted: January 17, 2010 -
Hyenas
In the world of animals, there are a lot of unique animals, but the Hyena is the real animal that stands out. Its massive jaws can crush the bones of its prey and usually it eats the whole carcass of its prey. They scientific name for the Hyena is Crocuta Crocuta. They Hyena mostly live in Africa, south of the Sahara, but except in the Congo Basin. Also large numbers of Hyenas live in Ethiopia,
Rating:Essay Length: 493 Words / 2 PagesSubmitted: February 15, 2010 -
Hygiene in Physical Education and the Locker Room
Keaton Mullenix P.E. Jr. and Sr. High Hygiene 4 October 2007 Hygiene in Physical Education and the Locker Room Today physical education is growing in schools. Along with physical education come bacteria and infectious diseases. Since physical education has the most person-to-person interaction of any junior high or high school course it is important that the physical education teacher provide knowledge to the students of these infectious diseases and how to prevent them. Personal hygiene
Rating:Essay Length: 557 Words / 3 PagesSubmitted: November 30, 2009 -
Hypertension
Manish Singh SBC101.6711 Prof. Landers Hypertension “Blood Pressure is the force of blood against the wall of the arteries. Systolic pressure is the pressure as the heart beats. Diastolic pressure is the pressure while the heart is at rest. Blood Pressure is written systolic over diastolic. For example, 110/75, 110 is the systolic pressure and 75 is the diastolic pressure. Hypertension is another term for High Blood Pressure. High Blood Pressure is diagnosed as a
Rating:Essay Length: 522 Words / 3 PagesSubmitted: January 17, 2010 -
Hypertension in My Body
Hypertension and My Body Hypertension is also known as high blood pressure. Hypertension is caused by various problems such as stress, poor diet (mainly an increase in sodium and caffeine), obesity, excessive alcohol usage, and smoking. Hypertension has been in my family for a while. Both of my grandfathers have high blood pressure and one of my grandmother’s also has high blood pressure. High blood pressure is a cause for strokes later in life. Usually
Rating:Essay Length: 485 Words / 2 PagesSubmitted: December 2, 2009 -
Hypohesis Identification
Define the business research and its purpose. Abstract Abstract The correlation structure of the world equity markets varied considerably over the past 150 years and was high during periods of economic integration. We decompose diversification benefits into two parts: one component due to variation in the average correlation across markets, and another component due to the variation in the investment opportunity set. From this, we infer that periods of globalization have both benefits and
Rating:Essay Length: 1,414 Words / 6 PagesSubmitted: November 19, 2009 -
Hypothalamus
The hypothalamus is a small, vital section of the brain located just below the thalamus; it is in charge of numerous important bodily functions. The hypothalamus is shaped like a cone and ends in the pituitary stalk, a part of the pituitary gland. It forms the major portion of the ventral region of diencephalons, and oversees autonomic and metabolic processes. The hypothalamus is the connection between the nervous system and the endocrine system, creating this
Rating:Essay Length: 1,104 Words / 5 PagesSubmitted: April 10, 2010 -
Hypothesis
upcoming years. As a result of the focus on full-service breakfast chains, the heart of the report is an exploration of family/midscale offerings. Attitudes toward brunch are likewise covered in the proprietary consumer research. This examination brings up an interesting conundrum--breakfast sales are rising rapidly, yet family/midscale chains show the slowest growth of any restaurant sector. This finding suggests that brand repositioning may be necessary for family/midscale operations to better capitalize on general growth in
Rating:Essay Length: 291 Words / 2 PagesSubmitted: November 8, 2009 -
Hypothesis: As Slope Increases, Acceleration Increases
Hypothesis: As slope increases, acceleration increases. Introduction: Speed is the distance traveled per unit time, velocity at any given moment is the slope of the tangent line through any relevant point on the graph, acceleration is the rate at which an object changes its velocity, and instantaneous acceleration is acceleration at any particular instant of time or the limiting value ∆v/∆t as the time interval (∆t) gets vanishingly small. Speed Formula Velocity Formula Acceleration Formula
Rating:Essay Length: 512 Words / 3 PagesSubmitted: May 28, 2010 -
Hypothyroidism
NURSING ADULTS II HYPOTHYROIDISM NAME SCHOOL TABLE OF CONTENTS INTRODUCTION 3 ANATOMY AND PATHOPHYSIOLOGY 3 SIGNS AND SYMPTOMS 7 RISK FACTORS 8 DIAGNOSTIC MEASURES 9 TREATMENT 10 RECENT DEVELOPMENTS 11 COMPLICATIONS 12 BIBLIOGRAPHIES 17 Introduction This document aims to provide you with a comprehensive overview of a thyroid disease called Hypothyroidism. Section one will discuss the anatomy and pathophysiology of the disease to show its common causes and what specific parts of the body are
Rating:Essay Length: 430 Words / 2 PagesSubmitted: January 22, 2010 -
Hypotrophic Cardiomyopathy
Hypertropic Cardiomyopathy In 409 B.C. Pheidippides, a Greek soldier and a conditioned runner ran from Marathon to Athens, a distance of 26 miles, to announce military victory over Persia. After delivering his message he collapsed and died. Pheidippides is the earliest athlete documented to die from sudden cardiac death. Today heart diseases such as, hypertrophic cardiomyopathy , idiopathic left ventricular hypertrophy and congenital coronary artery anomalies, are the most common diseases that lead to sudden
Rating:Essay Length: 1,315 Words / 6 PagesSubmitted: May 28, 2010 -
Hypoxia
The hypoxic zone in the Gulf of Mexico has been an issue of much debate in the agricultural community. Essentially a hypoxic zone is caused by an overabundance of nitrogen and phosphorus in the gulf. This excess nitrogen and phosphorus causes a rapid growth of large populations of algae and plankton when they die they sink to bottom to decompose which in turn robs the water of the oxygen necessary to sustain life. The
Rating:Essay Length: 551 Words / 3 PagesSubmitted: May 28, 2010 -
Hysteresis
Aim: To investigate the pattern in the amount by which a hanging piece of elastic stretches when a load force is applied and the amount by which the stretch is reduced when the load is removed. Aim (in simpler terms): To determine the relationship between the force on a rubber band and its stretch, both during extension and retraction. Hypothesis: Not required. Method 1) Hang a piece of elastic on a clamp stand. Ensure the
Rating:Essay Length: 466 Words / 2 PagesSubmitted: January 4, 2010 -
I Really Need Instant Acess
"A recently rediscovered obscure paper by a then up-and-coming young physicist named Albert Einstein on superconductivity has been published on Cornell University's arXiv e-print service on the Web. The paper, "Theoretical Remark on the Superconductivity of Metals," was written in 1922 for a symposium honoring Dutch scientist Kamerlingh Onnes, the discoverer of superconductivity, and published by the University of Leiden in the proceedings of the symposium. And there, apparently, it remained largely unnoticed until this
Rating:Essay Length: 432 Words / 2 PagesSubmitted: April 4, 2010 -
Ibs - Irritable Bowel Syndrome
IBS (Irritable Bowel Syndrome) is characterized as a common disorder of the intestines with symptoms of cramps, excessive gas, bloating, diahrrea, and constipation. Many patients diagnosed with IBS, suffer from at least two or three of these symptoms. More people suffer from IBS than either asthma or diabetes. Douglas A. Drossman, M.D., of the University of North Carolina in Chapel Hill was reported saying, “That in about 65 percent of the population with IBS, the
Rating:Essay Length: 2,525 Words / 11 PagesSubmitted: December 17, 2009 -
Ice and Sand
Ice and sand is an eye opening video about just what the title states: ice and sand. It talks about the polar ice caps and the affects of green house gasses to the environment. This movie talks about what would happen if the ice sheets in the north and South Pole melt, and how weather systems are changeable. It talks about the sands in the Sahara and how they blow all the way to Paris,
Rating:Essay Length: 969 Words / 4 PagesSubmitted: November 26, 2009 -
Ice Man
Super hero, nickname for jet fighter pilot in Tom Cruise classic, and 5000 year old corps found in a glacier; what do all three of these things have in common, there all called ice man. Unfortunately our paper is on the later of the three, but all the while a very intriguing topic. Dug out of a glacier in northern Italy more than a decade ago, the Ice man nicknamed Otzi, freezes, in all sense
Rating:Essay Length: 570 Words / 3 PagesSubmitted: January 5, 2010 -
Iceland
Iceland is a volcanic island in the North Atlantic Ocean east of Greenland and immediately south of the Arctic Circle. It lies about 4,200 kilometers (2,600 mi.) from New York and 830 kilometers (520 mi.) from Scotland. About 79% of Iceland's land area, which is of recent volcanic origin, consists of glaciers, lakes, a mountainous lava desert (highest elevation 2,000 meters-- 6,590 ft.--above sea level), and other wasteland. 20% of the land is used for
Rating:Essay Length: 321 Words / 2 PagesSubmitted: March 7, 2010