منابع مشابه
Evaluation of Radiation Exposure Pattern and Radiation Absorbed Dose Resulting from Occupational Exposure of Anesthesiologists to Ionizing Radiation
Introduction: Little information is available concerning the radiation exposure of anesthesiologists, and no such data have previously been collected in Iran. This prospective study was performed to determine the amount of radiation exposure of anesthesiologists for the purpose of assessing whether or not dangerous levels of radiation exposures were being reached, and to identify factors that c...
متن کاملRepulsion from Resonances
We consider slow-fast systems with periodic fast motion and integrable slow motion in the presence of both weak and strong resonances. Assuming that the initial phases are random and that appropriate non-degeneracy assumptions are satisfied we prove that the effective evolution of the adiabatic invariants is given by a Markov process. This Markov process consists of the motion along the traject...
متن کاملOn Gravitational Repulsion
The concepts of negative gravitational mass and gravitational repulsion are alien to general relativity. Still, we show here that small negative fluctuations small dimples in the primordial density field that act as if they have an effective negative gravitational mass, play a dominant role in shaping our Universe. These initially tiny perturbations repel matter surrounding them, expand and gro...
متن کاملEvaluation of Radiation Exposure Pattern and Radiation Absorbed Dose Resulting from Occupational Exposure of Anesthesiologists to Ionizing Radiation
INTRODUCTION Little information is available concerning the radiation exposure of anesthesiologists, and no such data have previously been collected in Iran. This prospective study was performed to determine the amount of radiation exposure of anesthesiologists for the purpose of assessing whether or not dangerous levels of radiation exposures were being reached, and to identify factors that co...
متن کاملRepulsion of bacteria from marine surfaces.
Organic compounds are capable of repelling motile bacteria from marine surfaces. The most effective compounds were acrylamide and benzoic and tannic acids. These were active at concentrations that were not toxic to the bacteria. Repellents were incorporated in nontoxic paints and applied to metal panels. Treated panels immersed in seawater developed a bacterial film of only 10(6) bacteria per c...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1876
ISSN: 0036-8733
DOI: 10.1038/scientificamerican05271876-347asupp