introduction: globally, the need for radiotherapy as a part of cancer management increases every year. thus, the shielding for megavoltage radiotherapy rooms is of great importance. materials and methods: in the present study, 14 types of developed high-density concrete with densities ranging from 2.45 to 5.11 were simulated by using monte carlo method. the linear attenuation coefficient and th...

introduction:  the use of radioactive iodine (131i) has become an important adjunct to the treatment of thyroid cancer and hyperthyroidism. salivary gland has the ability to concentrate radioactive iodine under normal circumstances. salivary gland dysfunction and dry mouth are the common side effectsof high-dose radioiodine therapy. the purposeof this study was to determine the absorbed dose of...

We developed a novel universal eigenvalue analysis for 2D arbitrary nanostructures comprising dispersive and lossy materials. The complex dispersion relation (or complex Bloch band structure) of a metallic grating is rigorously calculated by the proposed algorithm with the finite-difference implementation. The abnormally large group velocity is observed at a plasmonic band edge with a large att...

The attenuation of the signal introduced by propagation path between source compromising emanation (the location secured IT equipment) and antenna potential infiltrating system has a direct influence on electromagnetic safety equipment. article presents original analytical relationships necessary to estimate values signal, which correspond most probable locations equipment in relation system. a...

In the catastrophe insurance industry, it is impractical for a model to simulate millions of sites’ environments in short time. Hence, attenuation relation often adopted ground motion on account calculation speed, and both expectations uncertainties must be calculated. Due vulnerability curves our being based simulations with large number deterministic motions, necessary but not efficient loss ...

Recent theoretical accounts of emotion regulation assign an important role in this process to the prefrontal cortex, yet there is little relevant data available to support this hypothesis. The current study assessed the relation between individual differences in asymmetric prefrontal activation and an objective measure of uninstructed emotion regulation. Forty-seven participants 57 to 60 years ...

Rumination is a construct that cuts across a variety of disorders, including anxiety and depression. It has been associated with deficits in cognitive control thought to confer risk for psychopathology. One aspect of cognitive control that is especially relevant to the content of ruminative thoughts is error processing. We examined the relation of rumination and 2 electrophysiological indices o...

Full waveform inversion (FWI) is a nonlinear PDE constrained optimization problem, which seeks to estimate constitutive parameters of medium such as phase velocity, density, and anisotropy, by fitting waveforms. Attenuation an additional parameter that needs be taken into account in viscous media exploit the full potential FWI. more easily implemented frequency domain using complex-valued veloc...

A comprehensive treatment on complex eigenmodes is presented for general lossy traveling-wave electromagnetic structures. The per unit length propagation phase shift ( ?)-dependent eigenfrequencies ?(?) are mapped to frequency-dependent constant ?(? 0 ) a variety of Rigorous procedures compute t...