Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
During quality control of welding, rejection levels were determined using the comparison of the distribution of the parameters of acoustic-emission (AE) signals with introduced defects represented by titanium and tungsten inserts. The MARSE energy parameter, the mean number of oscillation along the leading edge of an…
The styrene-isoprene-butadiene terpolymers were prepared using n -butyl lithium as initiator, cyclohexane as solvent, tetrahydrofuran as structure modifier and tin tetrachloride as coupling agent by a method of the change addition time of structure modifier through the anionic polymerization technique. The polymerizat…
The use of boric acid (H 3 BO 3 ) and boron oxide (B 2 O 3 ) for the synthesis of cobalt-based catalysts by the co-precipitation technique was investigated and catalytic activities in hydrogen generation were evaluated. Different cobalt salts [cobalt (II) chloride (CoCl 2 · 6H 2 O), cobalt sulfate (CoSO 4 · 5H 2 O) an…
The problems of the reliability of rapidly worn parts of technical fleet vessels are considered. Recommendations for improving their durability are given.
Generally, the motor inside vehicle is exposed to highly ambient temperature and large vibration according to repeatedly starting and stopping for very short time. So, in this paper, the rotor shape design was performed to improve demagnetization endurance by considering the starting current of the Brushless DC (BLDC)…
Nickel films prepared by direct-current, pulse-current, and pulse reverse-current electrodeposition are studied. Scanning electron microscopy and atomic force microscopy show that the films consist of fine grains. The electrodeposition conditions are varied to prepare films with different grain sizes and surface rough…
Modern methods of three-dimensional reconstruction of sample surfaces based on scanning electron microscopy images allow one to quantitatively estimate morphological surface characteristics (specifically, parameters of irregularities, volumes of convexities and concavities, etc.). The accuracy of the method is analyze…
As the development of nanotechnology has extended to the world of biomolecules, a revolution has occurred in the design and assembly of nanomaterials for drug delivery with a significant potential to impact drug efficacy and patient outcomes. Currently a number of nanomaterials are under investigation for their suitab…
In this paper, novel frequency selective surfaces (FSS) with ultra-wideband (UWB) absorption are proposed, as well as a simple circuit model which can be used for their design. Multi-layered unit cell is realized using square ring resonators and various parameters and their effect on the FSS transmission performances…
Both boron (1, 2 and 3 at %) and fluorine (1, 3, 5 and 7 at %) doped zinc oxide thin films (ZnO:B:F) were fabricated using zinc chloride precursor by airbrush spray pyrolysis technique on glass substrates. X-ray diffraction (XRD) measurements show that all ZnO:B:F films have hexagonal wurtzite structure with a prefere…
Copper zinc tin sulfide (CZTS) thin films were synthesized by ex situ sulfidation of Cu-Zn-Sn metal alloy precursor films cosputtered from Cu, Cu-Zn, and Cu-Sn targets onto five different substrate materials: single crystal quartz, fused quartz, sapphire, Pyrex, and soda lime glass (SLG). Cosputtered precursor films,…
This paper presents an analysis and computation of stray losses in the tank cover of a 75 MVA three-phase core-type transformer. Stray losses in the region surrounding high current bushings are estimated using 3D Finite Element (FE) simulations. In the considered region the stray losses are high and its reduction is i…
Copper sols stabilized by a polymer-colloid complex are studied via dynamic light scattering and transmission electron microscopy. It is shown that the polymer-colloid complex including poly(acrylic acid) and the nonionogenic polymeric surfactant poly(ethylene glycol-600-monolaurate) is an effective protector of coppe…
High-performance decene-1 oligomerization catalysts based on mesoporous Al-HMS and Al-MCF aluminosilicates modified with an F-4SF sulfonated perfluorinated copolymer have been synthesized. Under batch conditions with a conversion of 90% and in a flow system with a conversion of 83%, these catalysts provide the formati…
The increased use of thin plates, like in ships for high-speed operation, results in significantly increased distortion. In-process control of welding distortion is more desirable than post welding rectification from the point of manufacturing efficiency. This can be achieved by suitably designing and also implementin…
A method is proposed for estimating the cathode layer parameters of a high-voltage stationary discharge taking into account nonlocal ionization and changes in the gas density upon heating by the discharge current. The criteria of the method applicability are obtained in the context of the kinetic approach to the descr…
The crystal structure of solid solutions in the Bi1 − x Pr x FeO3 system near the structural transition between the rhombohedral and orthorhombic phases (0.125 ≤ x ≤ 0.15) has been studied. The structural phase transitions induced by changes in the concentration of praseodymium ions and in the temperature have been in…
Fluid and its associatedmucus from the pallial (mantle) cavity of eastern oysters Crassostrea virginica (Gmelin) from Black RockHarbor, Bridgeport, Connecticut, inhibited growth of both Gram-positive (Bacillus subtilis, Staphylococcus aureus) and Gram-negative (Escherichia coli, Serratia marcescens, and Vibrio parahae…
The formulation of an effective combined electrolyte for anodizing and copper plating of aluminum and its alloys, characterized by decreased concentration of harmful components (sulfuric acid, copper sulfate), was developed. To obtain copper deposits of finely crystalline structure, introduction of fluorides into the…
The methanol dehydrogenation reaction has been studied over impregnated copper-containing catalysts. A silica-montmorillonite nanocomposite has been used as the support for these systems. The catalyst’s features were found to depend strongly on the distance of the interlayer spacing within the structure of montmorillo…