Topic
Mean free path
About: Mean free path is a research topic. Over the lifetime, 4412 publications have been published within this topic receiving 114418 citations.
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TL;DR: In this article, the properties of TeO2-(1-x)ZnO-xSm2O3 glasses synthesized using the method of mechanochemical synthesis and subsequent thermal sintering were studied.
Abstract: This paper presents the results of studying the properties of TeO2-(1-x)ZnO-xSm2O3 glasses synthesized using the method of mechanochemical synthesis and subsequent thermal sintering. The control of the elemental composition was carried out using the method of energy dispersive analysis, the amorphous structure of the glasses was confirmed by the data of the results of measurements of X-ray diffraction. The shielding efficiency was evaluated by such parameters as Radiation protection efficiency, linear and mass attenuation coefficient and gamma radiation absorption, half-value layer and mean free path values. During the research, it was found that TeO2-0.2ZnO-0.8Sm2O3 glasses had the highest shielding efficiency. The results obtained can later be used for the design of protective materials and the development of technological processes for their production.
44 citations
TL;DR: In this article, the authors calculate low field conductivity and mobility as a function of a sample length for small semiconductor samples and show that the apparent low field mobility is proportional to the device length.
44 citations
TL;DR: In this paper, the mass attenuation coefficient (μ/ρ), half value layer(HVL), tenth value layer (TVL), mean free path (MFP), effective atomic number (Zeff), electron density (Neff), equivalent atomic number Zeq, and effective removal cross section (ΣR) of prepared glasses were simulated for gamma photon energies between 0.015 and 15 MeV.
Abstract: Quaternary glasses with the chemical composition 50SiO2-25TiO2-5La2O3- (20-x) Na2O-xY2O3 by use the melt-quench method. The FT-IR spectroscopy investigated the structural change in these glasses. XRD examined the nature of these glasses. While the density is increased, the molar volume of the glass system is reduced. Ultrasonic velocities and elastic modulus of these glasses were experimentally and theoretically calculated based on the Makishima-Mackenzie model. Moreover, the radiation shielding capacity was evaluated for the studied glasses. The mass attenuation coefficient (μ/ρ), half value layer(HVL), tenth value layer (TVL), mean free path (MFP), effective atomic number (Zeff), electron density (Neff), equivalent atomic number Zeq, and effective removal cross section (ΣR) of prepared glasses were simulated for gamma photon energies between 0.015 and 15 MeV. Exposure build-up factor (EBF) and (EABF) of prepared glasses were evaluated.
44 citations
TL;DR: In this article, it was shown that in centimeter-long stripes of 100nm-thick metallic thin films, a reduction of the absolute value of thermopower occurs when the stripe width is in the order of 30-50 μm, which is 100-1000 times larger than the intrinsic mean free path of the material.
Abstract: For low-dimensional materials, size effect of a physical property is usually expected to occur when one (or more) of the dimension sizes decreases to that comparable to or smaller than one of the intrinsic characteristic lengths, e.g., the mean free path. We report here an unexpected size effect, that in centimeter-long stripes of 100-nm-thick metallic thin films, a reduction of the absolute value of thermopower occurs when the stripe width is in the order of 30-50 μm, which is 100–1000 times larger than the intrinsic mean free path of the material. When the stripe width is reduced to 1.5 μm, a relative reduction of thermopower up to 35% is measured in some metals. We suggest that the sidewall scattering due to rough edges of these stripes may be the origin of this unexpected phenomenon. The results may be applied to construct novel thermoelectric devices, such as thermocouples made from a single metal film.
44 citations
TL;DR: In this paper, an anisotropic Alfvenic turbulence spectrum corresponding to the Goldreich-Sridhar model by employing an enhanced nonlinear guiding center theory is computed for the mean free path of cosmic particles.
Abstract: Perpendicular diffusion coefficients and mean free paths of cosmic particles are computed for an anisotropic Alfvenic turbulence spectrum corresponding to the Goldreich-Sridhar model by employing an enhanced nonlinear guiding center theory. The calculations are important for understanding cosmic ray propagation in the Galaxy and in the solar system. In addition, the knowledge of diffusion coefficients is also useful for modeling charged particles which experience diffusive shock acceleration in supernova remnants and at interplanetary shock waves. To replace the parallel diffusion coefficient in our equation for the perpendicular diffusion coefficient, we employ different models such as quasilinear results and phenomenological models. The results are compared with those derived earlier. We demonstrate that the choice of the turbulence model as well as the choice of the model for the parallel diffusion coefficient has a strong influence on the perpendicular diffusion coefficient.
44 citations