نتایج جستجو برای: incident radiation
تعداد نتایج: 281981 فیلتر نتایج به سال:
The method of averaging is used to investigate the phenomenon of capture into resonance for a model that describes a Keplerian binary system influenced by radiation damping and external normally incident periodic gravitational radiation. The dynamical evolution of the binary orbit while trapped in resonance is elucidated using the second order partially averaged system. This method provides a t...
A recently developed version of the discrete-ordinates method is used along with elementary numerical linear-algebra techniques to establish an e$cient and especially accurate solution to what can be called Chandrasekhar's basic problem in radiative transfer, namely the problem of computing the radiation intensity in a "nite plane-parallel layer illuminated by an incident beam of radiation and ...
Mammography, using X-rays, is routinely utilized for screening of patients for prevention of breast cancer. Nevertheless, there is a small but significant risk of radiation induced carcinogenenesis associated with radiation exposure of the breast, being glandular tissue the most sensitive one among the tissues composing breast. Risk estimation in mammography may be determined by the mean absorb...
A method for evaluating characteristics of the scattered radiation emerging from a plane parallel atmosphere containing large spherical particles is described. In this method, the normalized phase function for scattering is represented as a Fourier series whose maximum required number of terms depends upon the zenith angles of the directions of incident and of scattered radiation. Some results ...
externally incident radiation. The present study provides a simple, straightforward, and highly accurate method of analysis for the determination of angular distribution of radiation anywhere in the medium. As an independent check, the results are compared with those calculated with the FN method [4]; the agreement was very good. Computations require very little computer time. In the tables pre...
The goal of the ANITA project is to detect neutrino interactions within the Antarctic ice cap. To do so, a radio antenna is used to detect radiation produced by the interaction. The radiation is scattered as it passes through the rough Antarctic surface. Power distributions of light through wavelength scale rough ground glass diffusers are investigated in hopes of understanding how the power di...
We demonstrate the hohlraum radiation temperature and symmetry required for ignition-scale inertial confinement fusion capsule implosions. Cryogenic gas-filled hohlraums with 2.2 mm-diameter capsules are heated with unprecedented laser energies of 1.2 MJ delivered by 192 ultraviolet laser beams on the National Ignition Facility. Laser backscatter measurements show that these hohlraums absorb 87...
We demonstrate that a pair of perpendicular electrical dipolar scatterers resonating at different frequencies can be used as a metamaterial unit cell to construct a nanometer-thin retarder in reflection, designing nanocross and nanobrick plasmonic configurations to function as reflecting quarter-wave plates at ~1520 and 770 nm, respectively. The design is corroborated experimentally with a mono...
The propagation of ionizing radiation through model atmospheres of terrestrial-like exoplanets is studied for a large range of column densities and incident photon energies using a Monte Carlo code we have developed to treat Compton scattering and photoabsorption. Incident spectra from parent star flares, supernovae, and gamma-ray bursts are modeled and compared to energetic particles in import...
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