Materials Literature
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It is shown experimentally that, in contrast to the stable configuration of (interstitial carbon)-(interstitial oxygen) complexes (C i O i ), the corresponding metastable configuration (C i O i *) cannot be found in n-Si based structures by the method of capacitance spectroscopy. The rates of transformation C i O i *…
The emission spectra of planar structures based on CdTe and Cd1 − x Mg x Te containing periodically built-in MnTe layers with a nominal thickness of one monolayer have been investigated. The luminescence spectra and luminescence excitation spectra of manganese ions and excitons, as well as the dependences of the spect…
A nanocrystalline powder of nonstoichiometric vanadium carbide VC0.875 with a coherent scattering region of 20±5 nm has been prepared by high-energy ball milling. The crystal structure, microstructure and particle size of the initial and milled powders have been investigated using X-ray diffraction analysis and scanni…
Physical properties as mechanical and tribological evolution on 4140 steel surfaces coated with hafnium nitride/vanadium nitride [HfN/VN] n multinanolayered systems deposited in various bilayer periods via magnetron sputtering has been exhaustively studied in this work. The coatings have been characterized in terms of…
Resistive compositions based on ter-copolymers of isobornylacrylate with methylmethacrylate and (meth)acrylic acid, which are synthesized using the controlled radical polymerization with reversible chain transfer, as well as triphenylsulphoniumtriflate as a photo-sensitive catalyst are studied. The effect of the chain…
The paper presents the results of experimental studies of the friction pairs composed of a carbon fiber-reinforced polymer rubbing against a steel counterbody in the dry friction conditions. Changes in the structure of the worn surface of the composites were analyzed using the atomic-force microscopy as dependent on t…
This paper proposes the design method of such elements by using the genetic algorithm(GA). In design of a reflectarray, to reduce a phase error on the aperture, we need to find a group of elements with arbitrary reflection phase value over the range of 360 degrees. Besides, it is desirable that their elements have a l…
Self-standing dense membranes from hyperbranched copolyimides based on (hexafluoroisopropylidene)diphthalic anhydride (6FDA), 1,3,5-tris(4-aminophenoxy)benzene (TAPOB) and 4,4′-(hexafluoroisopropylidene)dianiline (6FpDA) were successfully prepared and characterized for physicochemical properties. The synthesis involve…
In this paper, a new hybrid analytical modeling (HAM) approach, based on a direct coupling of analytical solution of Maxwell's equations with reluctance networks (RN), is compared to reluctance networks modeling based on a mesh, for the study of open circuit performance of a radial field rotating machine. In order to…
Perovskite based hybrid organic/inorganic solar cells have recently emerged as a possible alternative to silicon PV technology. These cells are solution processed which makes them significantly cheaper than the current technologies. In addition, the power conversion efficiency of such cells has surged from 6% to 19% i…
First-generation once annealed highly crosslinked polyethylene (HXLPE) has perfomed well for over 10 years but the presence of free radicals remain a concern. A second-generation sequentially annealed HXLPE was developed to further reduce wear, maintain mechanical strength, and enhance oxidative resistance.
For most “simple” analytes (e.g. oxygen), the actual sensing element of optochemical sensors consists of a luminescent dye embedded in a polymeric matrix whose luminescence intensity and decay time correlates with the analyte concentration. The response characteristics of these sensors are limited by the time requirem…
We have studied temperature dependence of the switching field in bistable amorphous and nanocrystalline FeMoBCu microwires with low Curie temperature. Using a low Curie temperature of amorphous matrix, a huge variation of the switching field (over 400%) in a quite narrow temperature range (20 °C-150 °C) has been obtai…
Magnetite nanoparticles were prepared with starch as surfactant by ball milling for 30 h a toluene medium. The nanoparticles were synthesized with different amounts of surfactant addition (8-12 wt%) and the variation in their effective anisotropy and magnetic properties with surfactant content is investigated. The sam…
Quantum dots (QDs) can absorb ultraviolet and long-wavelength light energy much more efficiently than natural light-harvesting proteins and transfer the excitation energy to photosynthetic reaction centers (RCs). Inclusion into liposomes of RC membrane pigment-protein complexes combined with QDs as antennae opens new…
The effects of the presence of ten organic ligands and common pH buffering agents – acetate, oxalate, tartrate, citrate, phthalate, EDTA, carbonate, TRIS, phosphate and borate – on aqueous Si concentration measurements made using the common molybdate blue method were quantified. The concentrations of these additives r…
To elucidate the effects of a pretreatment process on the uniformity of Ag electroless plating on Cu flakes, pretreatment time was mainly considered with a mixed solution of 0.15 M ammonium hydroxide and 0.0375 M ammonium sulphate. Optical inspection of Ag-coated Cu flakes determined that the optimal pretreatment time…
An experimental method to determine the beam spot size and the acid diffusion length of a positive chemically amplified electron-beam resist (p-CAR) is proposed. This method is applied to a reference p-CAR with a Vistec VB6 electron beam at 100 kV and with a MAPPER tool at 5 kV. Beam spot size characterization is base…
Natural bone is formed by a complex composite, essentially constituted of biological apatite and fibers of collagen. The combination of materials such as biopolymers and bioceramics may result in an interesting material for application in bone tissue regeneration. This work aims to obtain polymeric fibers containing P…
The influence of the structural state (by X-ray diffraction data) on the resistance to abrasive wear of titanium nitride (TiN) coatings obtained by vacuum-arc deposition at nitrogen pressures within (1–67) × 10 −2 Pa at a constant negative bias potential of −230 V with and without additional stimulation by high-voltag…