منابع مشابه
Radiofrequency and Microwave Radiation*
OVER the past five years awareness has been increasing among neurobiologists of ways in which information is processed in brain tissue. 1 Three lines of recent evidence are sharply at variance with most of what we learned in medical school about information transaction in central nervous tissue. The first line of evidence indicates that cell-to-cell communication between brain cells probably in...
متن کاملHazards of Microwave Radiation
The use of microwave is increasing day by day all over the world. Microwaves are used in mobile phones, microwave ovens, etc. Mobile or cellular phones are now an integral part of modern telecommunications. In many countries, over half the population use mobile or cellular phones and the market is growing rapidly. Researches are going on in various countries on the possible health effects of mi...
متن کاملRadiation Protection Standards for Medical Investigations
Large-scale using of ionizing radiation for medical investigations has benefits and risks. Every country has national standards for radiation protection, defining responsibilities of individuals and organizations for radiation control. In spite of the rich legislation, the total cumulated dose absorbed by a patient during medical investigations is not cumulated or established in a unified manne...
متن کاملLow-noise, high resolution microwave synthesis for atomic frequency standards
The performance of newer generations of ultra high stability atomic frequency standards based on laser cooled atoms and ions appears to be limited by the local oscillator and the microwave synthesis chain. To improve this performance, the design considerations of microwave synthesizers for Cs hyperfine clock transition at 9.192 GHz that emphasize high resolution, low phase modulation (PM) and a...
متن کاملCompact microwave cavity for high performance rubidium frequency standards.
The design, realization, and characterization of a compact magnetron-type microwave cavity operating with a TE(011)-like mode are presented. The resonator works at the rubidium hyperfine ground-state frequency (i.e., 6.835 GHz) by accommodating a glass cell of 25 mm diameter containing rubidium vapor. Its design analysis demonstrates the limitation of the loop-gap resonator lumped model when ta...
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ژورنال
عنوان ژورنال: Nature
سال: 1979
ISSN: 0028-0836,1476-4687
DOI: 10.1038/282360a0