Results 301 to 310 of about 3,531,640 (340)

Aging: a theory based on free radical and radiation chemistry.

Journal of Gerontology, 1956
The phenomenon of growth, decline and death—aging—has been the source of considerable speculation (1, 8, 10). This cycle seems to be a more or less direct function of the metabolic rate and this in turn depends on the species (animal or plant) on which ...
D. Harman
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Computed tomography--an increasing source of radiation exposure.

New England Journal of Medicine, 2007
The number of computed tomographic (CT) studies performed is increasing rapidly. Because CT scans involve much higher doses of radiation than plain films, we are seeing a marked increase in radiation exposure in the general population.
D. Brenner, E. Hall
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Radiation detection and measurement

Proceedings of the IEEE, 1981
introduces the reader to the DARE P simulation system. The DARE P system is an equation-oriented continuous system simulation language developed by the authors at the University of ArizonaIt is designed for batch-mode processing, and the system programs ...
G. Knoll
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The Ecology of Adaptive Radiation

Heredity, 2001
This volume is the ®rst of three volumes from a Festschrift marking the occasion of Richard C. Lewontin's 65th birthday and the approximate time of his retirement. The volumes were planned and invitations to authors were formalized in 1996.
G. Turner
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Comparison of quantum and semiclassical radiation theories with application to the beam maser

, 1962
This paper has two purposes: 1) to clarify the relationship between the quantum theory of radiation, where the electromagnetic field-expansion coefficients satisfy commutation relations, and the semiclassical theory, where the electromagnetic field is ...
E. Jaynes, F. Cummings
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Estimated risks of radiation-induced fatal cancer from pediatric CT.

AJR. American journal of roentgenology, 2001
OBJECTIVE In light of the rapidly increasing frequency of pediatric CT examinations, the purpose of our study was to assess the lifetime cancer mortality risks attributable to radiation from pediatric CT. MATERIALS AND METHODS Organ doses as a function
D. Brenner, C. Elliston, E. Hall, W. Berdon   +3 more
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Coherent and incoherent states of the radiation field

, 1963
Methods are developed for discussing the photon statistics of arbitrary radiation fields in fully quantummechanical terms. In order to keep the classical limit of quantum electrodynamics plainly in view, extensive use is made of the coherent states of ...
R. Glauber
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sources and effects of ionizing radiation

, 2000
NOTE The report of the Committee without its annexes appears as Official Records of the General Assembly, Sixty-third Session, Supplement No. 46. The designations employed and the presentation of material in this publication do not imply the expression ...
Nations United
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Emerging Nanotechnology and Advanced Materials for Cancer Radiation Therapy

Advances in Materials, 2017
Radiation therapy (RT) including external beam radiotherapy (EBRT) and internal radioisotope therapy (RIT) has been widely used for clinical cancer treatment. However, owing to the low radiation absorption of tumors, high doses of ionizing radiations are
Guosheng Song, Liang Cheng, Y. Chao, Kai Yang, Zhuang Liu   +4 more
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