| Papers [1-14] of 68 :: [Page 1 of 5] | | Go to page : 1 2 3 4 5 —> | Search results on "MAGNETIC LEVITATION TRAINS": |
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Magnetic Levitation Trains, 1999.
Examines concept, technology & development of Maglev train & the potential economic, social & environmental impact.
2,250 words (approx. 9.0 pages), 9 sources, £ 54.95
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From the Paper
"MAGNETIC LEVITATION TRAINS: IMPACT ON ECOSYSTEM
Introduction
This research examines the concept and technology of the magnetic levitation (Maglev) train with an objective of assessing the impact of the Maglev train on the ecosystem. The ?ecosystem,? for purposes of this research is defined broadly to include economic, environmental, political, population, and technological contexts.
Maglev: Concept, Technology, and Development
The Maglev train is a ?super high-speed transport system with a non-adhesive drive system that is independent of wheel-and-rail frictional forces? (Railway Technical Research Institute, 1997b, p. 1). The Maglev train represents a combination of superconducting magnets and linear motor technology.."
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Maglev Trains, 2002.
The development and use of magnetic levitation (maglev) propulsion systems in North America and around the world as an alternative mode of transportation.
2,400 words (approx. 9.6 pages), 5 sources, APA, £ 50.95
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Abstract
With air travel and the highways becoming increasingly congested, the need for an efficient, fast and comfortable mode of alternative travel has been felt in many countries of the world. One of the possible solutions is the Magnetic Levitation Propulsion System or high-speed trains called the Maglev train (short for magnetic levitation). The recent question mark over the safety of air travel and the fear of flying created among the general public by the events of 9/11 has renewed interest in the Maglev technology. This paper discusses how the Magnetic Levitation Propulsion System works and briefly overviews its history of development. The different types of designs developed so far, the cost of developing such systems, and the potential for its expansion and use in transportation systems in the United States and all over the world is also discussed. The author uses photographs and plan drawings to illustrate points.
From the Paper
"We all know that the opposite poles of a magnet attract while the like poles repel each other. This is the basic principle on which the Magnetic Levitation Propulsion System works. In magnetic propulsion systems, powerful electromagnets are used. The three basic components of a maglev train system are: A large electrical power source, metal coils that line the track or guide-way, and large magnets attached to the underside of the train. There is no conventional engine in maglev trains. Instead, the force for propulsion is achieved by a combination of the magnetic fields created by the electrified coils in the tracks (called the guideways) and the guideway walls."
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Nature and Process of Magnetic Pole Reversals, 2002.
An overview of the theory which predicts a reversal of the Earth's geomagnetic polarity.
6,075 words (approx. 24.3 pages), 20 sources, APA, £ 99.95
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Abstract
The paper shows that according to recent research, the earth?s magnetic field has shown signs that it is ready to shift. If this occurs, the magnetic north will point south and the magnetic south will point north and have disasterous effects on Earth. The paper discusses how scientists measure the magnetic field by tracking its history from a gigantic crack in the middle of the Atlantic Ocean that oozes lava. As the lava solidifies into rock, it records the Earth's magnetic polarity at various times. According to these records, the Earth is overdue for another reversal. The paper shows that prior to a magnetic field reversal, the magnetic field typically grows weaker and weaker until it almost disappears. As a result, the poles flip and strong magnetism starts up again. The paper explains how magnetism levels in ancient pottery indicate that over the past 4,000 years, the magnetic field has weakened by about half. In this century alone, it has decreased by five percent. The paper explores theories put forth by scientists that the Earth?s magnetic field could disappear in the next few hundred or thousand years.
Table of Contents
Abstract
Introduction
Origin of the Earth?s Magnetic Field
Paleomagnetism
Field Reversals
Theories of Magnetic Pole Reversals
Earth?s Magnetic Field
The Main Field
Secondary Field
Remanent Magnetization
Electromagnetic Dynamo Effect
Magnetization of Rocks
Curie Point
Processes of Magnetization in Rocks
Magnetic Anomalies
Paleomagnetic Data
Morphology of Reversals
Field Direction and Field Intensity
Field Reversals
What Drives Reversals?
Core-Mantle Boundary Processes
Bibliography
From the Paper
"Over the past three-and-a-half million years, the Earth?s magnetic poles have shifted approximately nine times. This estimate has been found through sampling of the magnetic records formed by rocks in the ocean beds and in ancient lava formations.
Scientists do not know how or why the magnetic poles reverse for sure, nor do they know exactly what effect this will have on life, as we know it. Many believe that the magnetic poles of the Earth reverse an average of every 200,000 years, but the time between reversals has varied widely. The Sun reverses its magnetic poles fairly routinely: essentially every 11 years."
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Human Diamagnetism Gravity Antenna Levitation, 2002.
This paper explores the scientific phenomenon of levitation.
650 words (approx. 2.6 pages), 2 sources, £ 18.95
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Abstract
Long thought of as a simple conjuring trick, an optical illusion, or something only deep meditation could bring about, levitation is now gaining validation and respect as a legitimate scientific event. Researchers in the field of levitation are now discovering that levitation is brought about by certain magnetic forces which are focused through the use of a human conduit or "antenna." This paper looks at techniques for achieving levitation and the scientific principles behind the phenomenon.
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Cobalt-based Hard Magnetic Films, 2001.
A highly technical paper that reviews literature on the operating procedure and magnetic properties of electrochemical deposited Co-based magnetic films.
2,057 words (approx. 8.2 pages), 13 sources, £ 44.95
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Abstract
This report reviews literature on the operating procedure and magnetic properties of electrochemical deposited Co-based magnetic films. The significance and limitations of electrochemical deposit Co-based magnetic films are analyzed.
From the Paper
" Hard magnetic materials have been a focus of interest in electrical engineering for years because of their applications as media in recording and potential applications in fabricating magnetic MEMS devices due to the strong magnetic field produced by them in absence of applying magnetic field1.2. Besides the hard ferrites and Nd2Fe14 B1, Cobalt or Cobalt-RE based magnets are mostly used hard magnetic materials because of their good magnetic properties as well as their excellent mechanical properties1. Generally speaking, Cobalt based hard magnetic materials are fabricated by PVD methods such as RF sputtering or evaporation. However, it is likely to be time and money consuming to apply these procedures, especially for a relatively thick film, say, 20mm or more, is needed. Furthermore, the fabrication of the film-type magnets on silicon wafers with CMOS integrated circuits has been considered as one of the most extremely difficult tasks due to the fabrication processing incompatibility between them."
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The Electric and Magnetic Sense of Animals, 2002.
This paper explores the different magnetic and electric properties that some animals posses.
1,810 words (approx. 7.2 pages), 11 sources, £ 40.95
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Abstract
This paper explores animals' abilities to sense electricity and magnetism and their ability to use these qualities as part of their sensory machinery. The author examines the type of electrical energy that certain animals release and provides examples.
From the paper:
"Imagine what it would be like if you were able to sense electric and magnetic fields. You would be able predict when a bad lightning storm was coming and orient yourself in the right direction if you were lost in the woods. Although such abilities only exist in fantasy for humans, many animals? posses these abilities in real life. In this paper we will explore the fascinating ability of certain animals to use electricity and magnetism as part of their sensory machinery."
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Magnetic Resonance Imaging and Time of the Day, 2008.
This paper discusses the importance of the time of day as it relates to research in magnetic resonance imaging (MRI).
884 words (approx. 3.5 pages), 6 sources, MLA, £ 21.95
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Abstract
In this article, the writer maintains that developers of research designs need to take all relevant processes into account if their results are to have validity. The writer notes that many researchers conducting functional magnetic resonance imaging (MRI) tests fail to take the time of day into consideration. The writer points out that this can lead to error given that cortisol levels are different throughout the course of a day. This is important because cortisol can cross the blood-brain barrier and bind to receptors in the hippocampus and frontal lobe. The writer explains that this can then have an impact on the neural activation/deactivation process, meaning the BOLD (blood oxygen level dependent) in the MRI study and produce results that will not be properly interpreted unless the time of day is included as a variable.
From the Paper
"Higher levels of cortisol are associated with stress, and cortisol levels vary throughout the day just as levels of stress will vary throughout the day. Because cortisol can cross the blood-brfain barrier and bind to the hippocampus, levles of cortisol can have an effect on the neural activation and deactivation of the BOLD levels and so alter the results of the MRI. Time of day thus becomes an element in the process so that the clinician knows what time of day the examination was made and how high the levels of cortisol might be at different tiemns of the day."
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Magnetic Hard Disk Drive, 2006.
An analysis of the construction, history, evolution, and importance of the magnetic hard disk drive in personal computers and other devices.
738 words (approx. 3.0 pages), 3 sources, MLA, £ 18.95
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Abstract
This paper discusses the magnetic hard disk drive and how it works, from its creation to the present day. It also discusses possible future technological advances. It then discusses the varied uses of hard drives and the impact the device has had on society over the past few decades.
From the Paper
"Personal computer technology has grown exponentially over the past few decades, but at its core, construction remains focused on certain necessary components. The magnetic hard disk drive is one of those components. Despite its importance and widespread use, many casual computer users know little about the history of or workings of this device. The magnetic hard disk drive, or simply hard drive, as it is known by most computer users, has come a long way and evolved over fifty years to become the ubiquitous storage device the world knows today."
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Magnetic Resonance Imaging (MRI), 2006.
A review of magnetic resonance imaging (MRI).
750 words (approx. 3.0 pages), 4 sources, MLA, £ 18.95
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Abstract
The paper examines pathologies and diagnosis discovered through the use of MRI. According to the paper, research has found that MRI's can be used to diagnose various ailments and illnesses in the body, including the early stages of lung and breast cancer. Such diagnoses could potentially save millions of lives.
Outline:
Introduction
Pathologies and Diagnosis discovered through the use of MRI
Conclusion
From the Paper
"In addition to pancreatic cancer and brain abnormalities MRI's can now be used to detect track inhaled or dissolved gases in the body. According to Kadlecek (2002) methods to examine the localized changes or abnormalities in lung structure and function were difficult to come by. The two most common types of diagnostic tools are spirometry which is the measurement of exhaled air volume and the speed at which it is expelled and the other diagnostic tool is chest x-rays, both conventional x-rays and those performed with CT scans (Kadlecek 2002). However when Helium-3 polarizers, are used in combination with magnetic resonance imaging (MRI), it can also be used as a diagnostic tool and permit the microscopic examination of lung structure and localized studies of lung function, which were not previously possible (Kadlecek 2002). "
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Computed Tomography and Magnetic Resonance Imaging, 1990.
This paper discusses the uses of computed tomography & magnetic resonance imaging in the diagnosis of brain disorders.
2,250 words (approx. 9.0 pages), 6 sources, £ 54.95
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From the Paper
"The use of computed tomography (CT) and magnetic resonance imaging (MRI) present both advantages and disadvantages relative to imaging for the diagnosis of brain disorders. While the MRI typically yields superior visibility of the suspected brain tumor mass, CT is superior to the use of radionuclide scans to set primary intracranial lesions. Further, while MRI does not "see" (image) bone, thus making it superior to CT for suspected intracranial brain tumor, its viability in scanning for vascular disease is as of yet unproved. In addition to these, contrast- ... "
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Magnetic Resonance Imaging (MRI), 2004.
Examines the history of MRI and its present-day applications.
2,450 words (approx. 9.8 pages), 6 sources, APA, £ 51.95
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Abstract
In July, 1977, an event took place that would forever alter the landscape of modern medicine. Outside the scientific research community, this event hardly attracted any notice at all. The event in question was the first MRI exam ever performed on a human being. The procedure required almost five hours to produce one image, and the images were, by today's standards, very primitive; however, its successors number in the thousands today. The advent of the MRI clearly represented the beginnings of a new standard in noninvasive radio-imaging that continues to be refined. This paper provides the background and history of magnetic resonance imaging, including its discovery and evolution and newly identified applications for the technique. A summary of the research is provided in the conclusion.
From the Paper
"MRI provides an unparalleled view inside the human body. The level of detail we can see is extraordinary compared with any other imaging modality. MRI is the method of choice for the diagnosis of many types of injuries and conditions because of the incredible ability to tailor the exam to the particular medical question being asked. By changing exam parameters, the MRI system can cause tissues in the body to take on different appearances. This is very helpful to the radiologist (who reads the MRI) in determining if something seen is normal or not. We know that when we do "A," normal tissue will look like "B" -- if it doesn't, there might be an abnormality. MRI systems can also image flowing blood in virtually any part of the body. This allows us to perform studies that show the arterial system in the body, but not the tissue around it. In many cases, the MRI system can do this without a contrast injection, which is required in vascular radiology."
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Magnetism, 2004.
Examining how the phenomenon of magnetism has made a great contribution to the technological revolution.
789 words (approx. 3.2 pages), 4 sources, MLA, £ 19.95
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Abstract
This paper analyzes the tremendous impact and the immense contribution of the science of magnetism in the technological arena. It begins by introducing the concept of magnetism and then discusses how it applies to nuclear magnetic resonance. It then discusses performing in-vivo studies and magnetoencephalography (MEG). It finally discusses how the technology is used in magnetic storage and magnetic chips.
From the Paper
"This era is characterized by the rapid advancements made in technology and the remarkable breakthroughs in every frontier of science have dramatically altered our lives. The phenomenon of magnetism in particular has made a great contribution in this technological revolution. The electron microscope, which is based on principle of magnetism, was one of the important and earliest scientific achievements (1930) which broke the barriers in the study of cell biology. Extensive research and development in the field has deepened our understanding of magnetic science and today we are better equipped than ever before to harness the power of magnetism. The application of magnetism is diverse and extends to almost all fields of science right from critical medical diagnosis to space engineering and information technology."
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Magnetism, 2000.
An experimental analysis of magnetic susceptibility.
1,543 words (approx. 6.2 pages), 4 sources, £ 34.95
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From the Paper
"The synthesis of a magnetic susceptibility standard proved to be Hg[Co(NCS)4] through mercury analysis and magnetic measurements. Magnetic susceptibility characterization of four nickel(II) complexes, Ni(Et2en)2Cl2-2H20, Ni(Et2en)2(NCS)2, Ni(Et2en)2(NO3)2, and Ni(Et2en)2I2, is reported. Et2en is a bidentate ligand, which is bonded strongly to the Ni(II) metal center.
Ni(Et2en)2Cl2-2H2O and Ni(Et2en)2(NCS)2 were both paramagnetic with two unpaired electrons and had Ueff values of 3.17 B.M. and 3.20 B.M., respectively. Ni(Et2en)2(NO3)2 and Ni(Et2en)2I2 were both diamagnetic with no unpaired electrons and had Ueff values of 1.80 B.M. and 1.71 B.M., respectively. The color of the compounds correlates with their magnetic properties, where blue to violet compounds are paramagnetic and yellow to red complexes are diamagnetic."
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The Magnet School, 2005.
This paper discusses magnet schools, defined as public schools that offer a special curriculum to attract students of different racial backgrounds.
770 words (approx. 3.1 pages), 1 source, MLA, £ 18.95
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Abstract
This paper explains that proponents of school choice, such as magnet schools, argue that allowing parents to choose their child's school will result in market-like competition and the decline of bureaucratic structures, thus compelling schools to compete and improve. The author points out that the admissions process is usually by lottery or "first-come, first-served" but about one-third of all magnet programs use a selective admissions policy, usually involving either a minimum test score requirement or, in a performing arts magnet, an audition. The paper states that a magnet schools are the best education choice because smaller class size allows teachers to provide their students with more attention, and these schools have more career oriented programs due to the generosity of contributions from business and well-organized Parent-Teacher-Student Associations.
From the Paper
"If magnet schools fail to respond to parental dissatisfaction, parents may enroll their children elsewhere. Other researchers have found that magnet schools provide more opportunities for parental involvement and effective communication between parent and teacher. However, larger-scale studies using national studies and data contradict these findings, finding that magnet and non-magnet schools use similar curriculum and modes of instruction. Magnet schools afford teachers more involvement in decision making, as choice advocates predict."
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