Results 291 to 300 of about 50,016 (339)
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Magnetic biochar for environmental remediation: A review
Bioresource Technology, 2020The difficulty of separating the powdered biochar from the environmental medium may lead to secondary pollution and hinder the large-scale application of biochar as an adsorbent. An effective strategy to solve this bottleneck is to introduce transition metals and their oxides into the biochar matrix, creating easily separable magnetic biochar. Magnetic
Yunqiang, Yi +7 more
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Environmental magnetism and climate change
Contemporary Physics, 2007A major and pressing problem is to understand how, and how fast, the Earth's climate has changed in the past, with and without human influences on the global carbon cycle. Magnetic, remanence-acquiring, minerals, mostly iron oxides and sulphides, occur ubiquitously in sediments.
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Environmental Power-frequency Magnetic Fields and Suicide
Health Physics, 1981AbstractWe studied the relationship between power-frequency magnetic fields and locations of suicidal deaths in 1969–76 in the West Midlands, England. We found a significant correlation between suicide locations and the measured power-frequency magnetic field strength.
F S, Perry +3 more
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Environmental magnetic fields: Influences on early embryogenesis
Journal of Cellular Biochemistry, 1993AbstractA 10‐mG, 50 to 60‐Hz magnetic field is in the intensity and frequency range that people worldwide are often exposed to in homes and in the workplace. Studies about the effects of 50‐ to 100‐Hz electromagnetic fields on various species of animal embryos (fish, chick, fly, sea urchin, rat, and mouse) indicate that early stages of embryonic ...
I L, Cameron +4 more
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Environmental magnetism — A personal perspective
Quaternary Science Reviews, 1991Abstract Environmental magnetism is a versatile methodology applicable to a wide range of environmental studies and contexts. The complexity and unfamiliarity of many natural magnetic assemblages, coupled with the very versatility and sensitivity of the measurements can often limit interpretations at present, and there is an urgent need to improve ...
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Environmental Vibration Induced Magnetic Field Disturbance in MRI Magnet
IEEE Transactions on Applied Superconductivity, 2012Environmental vibrations from building and traffic cause the cryostat to move with respect to the magnet cartridge in MRI magnets. The relative motion will create eddy current in cryostat. The eddy current will disturb the magnet central frequency, which creates ghosting in images. This study is aimed at formulating the methodology for a mechanical and
null Longzhi Jiang, T. J. Havens
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Environmental NMR: Magnetic Resonance Imaging
1996Magnetic resonance imagingin (MRI) in environmental sciences offers a unique window to dynamic processes in aquifers and soil. While maintaining close to natural conditions during experiments, a variety of (reactive) transport processes are accessible at the level of single flow paths.
Nikolaus Nestle +2 more
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Magnetic minerals and environmental systems
1986The major primary energy sources in the sun and in the Earth’s interior ultimately drive all the systems of energy transformation and material flux which are the concern of environmental scientists. Whether we are studying the lithosphere, hydrosphere or atmosphere, or the cycles which involve the transfer of material between them, the movement of ...
Roy Thompson, Frank Oldfield
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Magnetic Resonance Spectroscopy and Environmental Toxicant Exposure
Annals of the New York Academy of Sciences, 2007Abstract: The study of neurological impacts of toxicants has emphasized neuropsychological tests as important outcome variables. Direct assessment of neural substrates of environmental impacts could offer many advantages. I discuss our use of magnetic resonance spectroscopy (MRS) in the neurological assessment of adult lead poisoning of monozygotic ...
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