Energy absorption performance is one of the most important indexes in the vehicle safety during impact. Research on the car frontal structure energy performance and structure optimization was conducted in this paper. Whole vehicle model was established by HyperMesh and simulated in LS-DYNA. Simulation results indicated that modification was need for the original structure to meet requirement. B...

The/3-carotene absorption from the lowest triplet state was investigated over a wide spectral range. A new absorption transition in the nearIR region was found. The absorption band exhibited a 0--0 transition at about 8100 cm1 with a low intensity, lower by a factor of approximately 300 than the intensity of the known triplet-triplet absorption in the visible range. The vibronic structure of th...

a three-step selective photo-ionization for gd155 and gd157 isotopes by pulsed laser wasevaluated numerically. due to large thermal neutron absorption cross sections, these two isotopes innatural gadolinium are good candidates as burnable poison to control reactivity early in the fuel cycleand allow extended fuel burn up. rate equations have been used to calculate the dynamics of the isotopepop...

The Bremsstrahlung spectrum from a 6-MV linear accelerator (LINAC) was obtained and used as an input X-ray source in the simulation to estimate several important physical quantities of the detector in a therapeutic X-ray portal imaging system, such as quantum and energy absorption efficiencies, Swank factor, and detective quantum efficiency (DQE). In addition, we have obtained a spatial distrib...

The dynamics of damage and ablation of individual particles of ;100 nm in size due to short-pulse laser irradiation is studied using a breathing sphere model and molecular dynamics simulations. The fluence thresholds for damage and ablation of irradiated particles have a strong pulse duration dependence. For 15 ps laser pulses, the laser induced pressure buildup and the focusing of the pressure...

Application of impact energy absorption systems in different industries is of special significance. Thin-walled tubes, due to their lightness, high energy absorption capacity, long crushing length and the high ratio of energy absorption to weight, have found ever-increasing application as one of the most effective energy absorption systems. In this research, through  carrying out experimental t...

Conventional electron-probe microanalysis has an X-ray analytical spatial resolution on the order of 1-4 μm width/depth. Many of the naturally occurring Fe-Si compounds analyzed in this study are smaller than 1 μm in size, requiring the use of lower accelerating potentials and nonstandard X-ray lines for analysis. Problems with the use of low-energy X-ray lines (soft X-rays) of iron for quantit...

Motivated by the brane-world scenarios, we study the absorption problem when the spacetime background is (4 + n)-dimensional Schwarzschild black hole. We compute the low-energy absorption cross sections for the branelocalized massive scalar, brane-localized massive Dirac fermion, and massive bulk scalar. For the case of brane-localized massive Dirac fermion we introduce the particle’s spin in t...