Materials Literature
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In this contribution we demonstrate a method of synthesizing a hexagonal boron nitride (h-BN) thin film by ambient pressure chemical vapor deposition on polycrystalline Ni films. Depending on the growth conditions, the thickness of the obtained h-BN film is between ∼5 and 50 nm. The h-BN grows continuously on the enti…
The surface plasmon-polaritons and waveguide modes in prismatic structures are researched. The metallic layer is deposited on glass prism in the first structure and dielectric layer was deposited on metallic film in the second structure. The reflectance from the metallic layer equal zero at assiduously defined paramet…
Materials with systematic absence of X-ray diffraction (XRD) peaks are desirable for conducting some special researches using X-ray diffraction or time-resolved X-ray scattering. This paper proposes a method for designing this kind of materials. It utilizes solid solution to reduce the structure factor of a selected r…
采用等压法研究了308.15 K 下NaCl-H2O、CaCl2-H2O 和NaCl-CaCl2-H2O 体系离子强度分别为0.5666~5.9265 mol kg−1、0.3943~5.5573 mol kg−1 和0.6524~16.6631 mol kg−1 的等压平衡浓度和水活度, 计算了渗透系数及饱和蒸汽压, 获得了该体系渗透系数和饱和蒸汽压随离子强度的变化规律. 应用Pitzer 离子相互作用模型, 用实验数据用多元线性回归拟合了308.15 K 下该体系的NaCl 和CaCl2 的纯盐参数β(0)、β(1)、Cφ 分别为0.3181、1.5346、−0.0014 和0.07972、 0.3067、0.00075, 拟…
Abstract : Numerical simulations of compression Hopkinson bar tests on soft, nearly incompressible materials were performed in an effort to understand inertial effects in these tests. The specimen was modeled as either a linear elastic or a nonlinear elastic solid; the nonlinear model was calibrated to ballistic gelat…
First-principle calculations have become a valuable tool in the study and exploration of new energy hydrogen storage materials. In this paper, novel results and important progresses on the first-principle calculations of hydrogen storage materials are introduced. The application of first-principle calculations in hydr…
Problem statement: In the last decade, the studies and investigation on polymer-based composites have drawn significant attention owing to improvement in their mechanical, thermal, electrical, optical and pharmaceutical properties as compared with pure polymer. Approach: Different compositions of Ni 0.2 Zn 0.8 Fe 2 O…
Abstract Porphyrin‐ or zinc‐porphyrin‐cyanuric acid conjugants (TPP‐CA or ZnTPP‐CA) and anthraquinone connected with the known "Hamilton receptor" (AQ‐H) were synthesized. The supramolecular dyads constructed via the AQ‐H and TPP‐CA/ZnTPP‐CA exhibit six hydrogen bonds, which provide the association constant K APP appr…
Zinc oxide (ZnO) thin films were grown on n-GaN/sapphire substrates by radio-frequency (RF) magnetron sputtering. The films were grown at substrate temperatures ranging from 400 to 700 °C for 1 h at a RF power of 80 W in pure Ar gas ambient. The effect of the substrate temperature on the structural and optical propert…
Temperature kinetics along the crack propagation path in the bulk of PMMA at 20°C and under impact loading is explained. The initial experimental data are taken from [1, 2]. The kinetic temperature-time curve includes six different regions. In this study, the sequence of regions in the temperature kinetics is interpre…
Photoluminescence (PL) spectra of Si nanocrystals (NCs) prepared by 130 keV Si ions implantation onto SiO 2 matrix were investigated as a function of annealing temperature and implanted ion dose. PL spectra consist of two PL peaks, originated from smaller Si NCs due to quantum confinement effect (QCE) and the interfac…
Erosive wear characteristics in plain soil-water slurry of carburized mild steel samples were experimentally studied in an in-house designed and fabricated apparatus. The studied carburization technique greatly improved the hardness and wear resistance in the carburized steel. Both the hardness and wear resistance val…
Adsorption of atomic carbon on δ-Pu(111) surface is investigated systematically using density functional theory with RPBE functional. The adsorption energies, adsorption structures, Mulliken population, work functions, layer and projected density of states are calculated in wide ranges of coverage, which have never be…
Pale-podzolic soils occupying slope positions in a small stream valley are more acidic and contain less pedogenic chlorites in the clay fraction than those soils occupying uplands. These characteristics are thought to be caused by more intensive leaching of matter from eluvial horizons due to intensive lateral interfl…
Although capital cost trends for fuel cell and microturbine technologies continue toward better affordability, the combination of systems may yield accelerated market viability. To this end, a cost and unit-sizing analysis is conducted using a solid-oxide fuel cell (SOFC) and microturbine (MT) hybrid system to supply…
The characteristics of rate oscillations in submicron deformation increments in the course of creep under compression of polymer materials of different classes, namely, amorphous poly(vinyl butyral), amorphous-crystalline poly(tetrafluoroethylene), and a composite consisting of polyimide with graphite particles, have…
The purpose of this article is to illustrate a new classification of resin based aesthetic materials laying on the characterization of their matrix and their filler morphology. Four samples per material have been prepared for SEM evaluation. Each sample has been treated with chloroform to dissolve its matrix in order…
ZnSe nanorods are grown by varying the amount of reducing agent Sodium borohydride and keeping the amount of zinc chloride, selenium powder constant. The samples are characterized using electron diffraction techniques. Simultaneously optical absorption, photoluminescence and longtime photorelaxation of these samples a…
The saturation of the ferromagnetic core in electrical machines significantly affects their performance. In the steady-state and dynamic analyses of electrical machines, an accurate representation of the saturation characteristics in the machine simulation model is important. In this paper, a new trigonometric algorit…
Alkane oxidation by O 2 and CO in the presence of Rh-, Pd-, and Pt-containing catalytic systems leads to the product of C-H bond oxidation and the products of C-C bond oxidative destruction. A deuterated methyl group in acetic acid is observed in the oxidation of n -propane in a deuterium-donor medium. The possible me…