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inorganic chemistry
inorganic chemistry the study of all the elements and their compounds with the exception of carbon and its compounds, which fall under the category of organic chemistry . Inorganic chemistry investigates the characteristics of substances that are not organic, such as nonliving matter and minerals ...
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Norman Foster Ramsey
Norman Foster Ramsey 1915-, American physicist, b. Washington, D.C., Ph.D. Columbia Univ., 1940. A physics professor at Harvard after 1950, Ramsey also held several posts with such government and international agencies as NATO and the U.S. Atomic Energy Commission. He was awarded the 1989 Nobel Pri...
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burn
burn injury resulting from exposure to heat, electricity, radiation, or caustic chemicals. Three degrees of burn are commonly recognized. In first-degree burns the outer layer of skin , called epidermis, becomes red, sensitive to the touch, and often swollen. Medical attention is not required but ...
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gamma radiation
gamma radiation high-energy photons emitted as one of the three types of radiation resulting from natural radioactivity . It is the most energetic form of electromagnetic radiation , with a very short wavelength (high frequency). Wavelengths of the longest gamma radiation are less than 10 -10 m,...
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ultrasonics
ultrasonics study and application of the energy of sound waves vibrating at frequencies greater than 20,000 cycles per second, i.e., beyond the range of human hearing. The application of sound energy in the audible range is limited almost entirely to communications, since increasing the pressure,...
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astrophysics
astrophysics application of the theories and methods of physics to the study of stellar structure , stellar evolution , the origin of the solar system , and related problems of cosmology . The distinction between astrophysics and modern astronomy is disappearing in scientific usage.
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synchrotron radiation
synchrotron radiation in physics, electromagnetic radiation emitted by high-speed electrons spiraling along the lines of force of a magnetic field (see magnetism ). Depending on the electron's energy and the strength of the magnetic field, the maximum intensity will occur as radio waves, visible...
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Nuclear Regulatory Commission
Nuclear Regulatory Commission (NRC), an independent U.S. government commission, created by the Energy Reorganization Act of 1974 and charged with licensing and regulating civilian use of nuclear energy to protect the public and the environment. All licensing and regulatory powers of the former Ato...
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chiropractic
chiropractic [Gr.,=doing by hand], medical practice based on the theory that all disease results from a disruption of the functions of the nerves. The principal source of interference is thought to be displacement (or subluxation) of vertebrae of the spine, although other areas such as joints and m...
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dynamics
dynamics branch of mechanics that deals with the motion of objects; it may be further divided into kinematics, the study of motion without regard to the forces producing it, and kinetics, the study of the forces that produce or change motion. Motion is caused by an unbalanced force acting on ...
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