نتایج جستجو برای: bulk
تعداد نتایج: 76987 فیلتر نتایج به سال:
In this paper, ferroelectric thin films, described by an ising model in a transverse field, have been studied under the mean-field approximation. We discuss a thin film composed of N-layer film of simple cubic symmetry with nearest-neighbor exchange in which the exchange strength and transverse field are assumed to be different from the bulk values in Ns surface layers, and we derive and illust...
In this paper, we calculate the relativistic bulk tensor and shear tensor of the relativistic accretion ows in the Kerr metric, overall and without any approximation. We obtain the relations of all components of the relativistic bulk and shear tensor in terms of components of four-velocity and its derivatives, Christoffel symbols and metric components in the BLF. Then, these components are deri...
statement of problem: for many years, application of the composite restoration with a thickness less than 2 mm for achieving the minimum polymerization contraction and stress has been accepted as a principle. but through the recent development in dental material a group of resin based composites (rbcs) called bulk fill is introduced whose producers claim the possibility of achieving a good rest...
abstract saturated water content is one of the important parameters which its measurement is necessary in estimation of soil water retention and unsaturated hydraulic conductivity curves. in several researches, saturated water content is assumed to be equal to soil total porosity. in some others, its value is estimated by pedotransfer functions using readily available parameters, such as bulk d...
the purpose of this preliminary study was to determine the prevalence of raw milk contamination with listeria monocytogenes. in this study, 100 bulk tank milk samples were collected randomly and delivered to pegah pasteurization factory in mashhad.for isolation and identification of l. monocytogenes, the samples were first enriched using cold enrichment method in listeriaenrichment broth, follo...
Rhizosphere is a small zone and has quite different chemical, physical, and biological properties from bulk soil. This research was performed to study the available Zn and its fractions in the wheat rhizosphere and bulk soils by using rhizobox at greenhouse conditions. Total organic carbon (TOC), dissolved organic carbon (DOC), microbial biomass carbon (MBC) and available Zn using 7 chemical pr...
In this article, the electronic and optical properties of bulk TiC and its narrow nanowires were investigated using Quantum-Espresso/PWSCF computational package in the framework of density functional theory. According to the results, this compound showed a metallic behavior in the bulk structure, but the small diameters of the nanowires against the bulk structure&n...
In recent work the structural, electronic and optical properties of BSb compound in bulk and surface (110) states have been studied. Calculations have been performed using Full-Potential Augmented Plane Wave (FP-LAPW) method by WIEN2k code in Density Functional Theory (DFT) framework. The structural properties of the bulk such as lattice constant, bulk module and elastic constants have been inv...
در این پایان نامه خواص و جنبه های مختلف کربن معرفی و مروری کلی بر روشهای ساخت ، ساختار و خواص انواع مختلف کربن از کربنهای bulk(شامل گرافیت ، گرافیت turbostratic، الیاف کربن، دوده هاو ... ) تا کربنهای نانومقیاس (شامل fullerenes ، کپسولهای نانومقیاس ، کربنهای nanotube و ... ) ارائه می شود. عمده کار متوجه کربنهای nanotube(اعم از multi-wall و single-wall ) است و ساختار ، عیوب شبکه ای و روشهای ساخت ...
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