Materials Literature
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Tc and its nitrides TcN, TcN2, TcN3 and TcN4 are studied using the projector augmented wave method based on the density functional theory. The elastic properties, electronic structure and atomic populations, theoretical hardness of Tc nitrides are calculated and analyzed. The calculation results show that with increas…
Engineering MEMS devices using finite element analysis can be very rewarding, provided the analysis is valid, i.e. it accurately simulates reality throughout the desired range of input and resultant imposition upon dependent physical properties and behavior. With respect to FEM’s use in MEMS, it is can be very useful.…
The absorption behavior of copper atoms on the armchair （5,5） single wall carbon nanotube is investigated by the density functional theory. It is shown that the absorption on the outside nanotube is energetically preferred to that on the inside nanotube, Morever, the adsorbed copper atom on the top of carbon is more s…
The aspiration of bordered pits during drying of wood is the most important reason for a limited impregnability of Norway spruce (Picea abies (L.) Karst.). Incubation of this wood species with the white rot fungus Physisporinus vitreus for a period of 6 weeks (Bioincising) improves significantly the subsequent uptake…
A simple, sensitive spectrophotometric method was developed for the determination of rabeprazole sodium (RA) in pure form and for pharmaceutical formulations. The charge transfer interaction between RA and 2,3-dichloro-5,6- dicyano-p-benzoquinone (DDQ) as an acceptor was investigated spectrophotometrically. Variables…
This work proposes a modification in the Jiles-Atherton hysteresis model in order to improve the minor loops representation. The irreversible magnetization component is slightly modified keeping unchanged the other model equations and the model simplicity. Differently to other proposed methodologies found in the liter…
Multilayer nonwoven fabrics are an important part of fibrous filters used in ventilation systems. The run of the filtration process depends on the structure of the fabric system, the aerosol particle deposition mechanisms and the aerosol flow conditions. This article dis cusses, in terms of theoretical models, the res…
The paper presents the properties of expanded polystyrene slabs manufactured by different manufacturers. The research on the effect of moisture impact on the value of thermal conductivity coefficient of expanded polystyrene products has been carried out too. The limits for application of results of research have been…
Barriers protecting humans against electromagnetic microwave radiation were manufac- tured from polyester and flax fabrics with embroidered electro-conductive elements so as to enhance the wave attenuation. The shape, material properties and spatial distribution of the elements were chosen taking into account previous…
Several two fully threaded guide bar warp knitted structures with three different course densities (cpc) were knitted from polyester textured yarns, and their tensile properties and fatigue behavior were investigated. Tensile tests were applied to determine the tensile behaviour of the fabrics and obtain the parameter…
The influence of particle shape (aspect ratio) on the intrinsic viscosity is investigated, taking three Czech kaolin products (floated kaolins) as paradigmatic examples. An average aspect ratio is obtained for each kaolin from a comparison of particle size measurements using sedimentation and laser diffraction. The in…
The secondary dendrite arm spacing (SDAS) is one of the most important microstructure features of as-cast structure in hypoeutectic aluminum alloys. The size of SDAS depends on many factors such as liquid metal treatment, temperature gradient, cooling rate/solidification time and chemical composition of melt. Among th…
The recent growth of interest in atomic power, the “nuclear renaissance”, is undoubtedly driven by environmental concerns. Nevertheless, there are many opponents to such a move and, increasingly, their arguments focus on the backend of the nuclear cycle, with waste disposal claimed to be the “Achilles Heel” of nuclear…
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Our understanding of the structural performance of laminated glass has made great advances over the past decade. In this contribution we review two major calculation methods that have been developed to compute stress and deformation development during the loading of laminated glass: 1) the effective thickness method,…
In this paper, a new salient-pole synchronous generator (SG) termed the PMa-SG is presented. In the PMa-SG, permanent magnets (PMs) are placed between the pole shoes to reduce the magnetic saturation in the field poles. By using finite element analysis (FEA), the internal magnetic fields and basic characteristics of a…
The use of thin ultra high strength steel automotive passive safety components manufactured with the press hardening process has increased drastically the last two decades. The application and complexity in design has increased and thermo mechanical forming simulation is an important tool to optimize the final compone…
Compact large area Zn5(OH)8(NO3)2·2H2O, Co5(OH)8(NO3)2·2H2O and Co-doped Zn5(OH)8(NO3)2·2H2O thin films with uniform surface morphology and good orientation were synthesized by an unusual dual-template biomimetic approach. In such a biomimetic system, a bovine serum albumin Langmuir monolayer was used as one organic m…
Ceria-based materials are promising solid "oxygen reservoirs" for propane oxidative dehydrogenation. The ceria lattice oxygen can selectively combust hydrogen from the dehydrogenation mixture at 550 degrees C. This shifts the dehydrogenation equilibrium to the desired products side, generates heat aiding the endotherm…
Excellent properties of ADI (Austempered Ductile Iron) are widely praised by the world technical literature. These properties depend onthe cast iron microstructure formed during the heat treatment process of a specific type. The matrix of ADI is a mixture of lamellar ferrite and high-carbon austenite. It seems, howeve…