نتایج جستجو برای: background radiations

تعداد نتایج: 839529  

2007
Cesidio Bianchi Antonio Meloni

The terrestrial environment is continuously exposed to electromagnetic radiations which set up a “background” electromagnetic noise. For what concerns electromagnetic waves in the Non Ionizing Radiation band (NIR), i.e. for frequencies lower than 300 GHz, the background can have a natural or an artificial origin. In the first case electromagnetic radiations have generally an atmospheric or a co...

Journal: :Progress of Theoretical Physics Supplement 1960

Journal: :The British journal of ophthalmology 1977
M M Zaret W Z Snyder

Nine cases of hertzian radiation cataracts are reported among personnel working in operational aviation environments, where they were irradiated repeatedly at subliminal non-thermal field intensities. The resultant ocular pathology evolved insidiously and slowly over a period of years in a similar way to other forms of radiational injury. By the time of consultation examination, all had progres...

Journal: :Bioinformatics 2008
Luke J. Harmon Jason T. Weir Chad D. Brock Richard E. Glor Wendell Challenger

SUMMARY GEIGER is a new software package, written in the R language, to describe evolutionary radiations. GEIGER can carry out simulations, parameter estimation and statistical hypothesis testing. Additionally, GEIGER's simulation algorithms can be used to analyze the statistical power of comparative approaches. AVAILABILITY This open source software is written entirely in the R language and ...

2018
Mikael Pontarp Owen L Petchey

Much of life's diversity has arisen through ecological opportunity and adaptive radiations, but the mechanistic underpinning of such diversification is not fully understood. Competition and predation can affect adaptive radiations, but contrasting theoretical and empirical results show that they can both promote and interrupt diversification. A mechanistic understanding of the link between micr...

2008
Kelly B. Mahaney

OBJECTIVE: The aim of this study was to delineate the anatomic relationship of the optic radiations to the atrium of the lateral ventricle using the Klingler method of white matter fiber dissection. These findings were applied to define a surgical approach to the trigone that avoids injury to the optic radiations. METHODS: Sixteen cadaveric hemispheres were prepared by several cycles of freezin...

Journal: :Journal of alternative and complementary medicine 2004
Lucietta Betti Grazia Trebbi Lisa Lazzarato Maurizio Brizzi Gian Lorenzo Calzoni Fiorenzo Marinelli Daniele Nani Francesco Borghini

OBJECTIVES The aim of the present study was to evaluate the effects of nonthermal extremely high-frequency microwave radiations in a plant-based bioassay, represented by tobacco plants reacting to tobacco mosaic virus with a hypersensitive response leading to the appearance of necrotic lesions at the infection sites. DESIGN This study was performed blind and different experimental protocols o...

Journal: :Neurosurgery 2008
Kelly B Mahaney Saleem I Abdulrauf

OBJECTIVE The aim of this study was to delineate the anatomic relationship of the optic radiations to the atrium of the lateral ventricle using the Klingler method of white matter fiber dissection. These findings were applied to define a surgical approach to the trigone that avoids injury to the optic radiations. METHODS Sixteen cadaveric hemispheres were prepared by several cycles of freezin...

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