Materials Literature
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In the present study, bismuth oxide (Bi2O3) powders were prepared from bismuth nitrate at various temperatures by spray pyrolysis (SP). The Bi2O3 powder can convert from a monoclinic α phase to a tetragonal β phase at a pyrolysis temperature of > 600° C. The crystallinity of the SP powder increased with the increase o…
Modern requirements for power sources of welding electron guns are formulated. The electron-gun parameters are analyzed as the power source load, and main trends in electrical equipment for electron-beam welding are revealed. The modern principles for construction of power sources for electron-beam welding units are c…
The composite right/left-handed (CRLH) transmission line (TL) is presented as a general metamaterials unit possessing both left-handed (LH) and right-handed (RH) natures. An improved unit cell of composite right/left handed transmission line is proposed. The electrical equivalent circuit of the unit is discussed. In a…
Resin bond is one of the most widely bond used for manufacturing abrasive product. This review paper discusses historical perspectives on resin bond, there are different abrasive products which can be produced by using various types of resin bond such as modification of Phonetic resin and a new water-soluble resin. It…
Effect of carbide precipitation on pinning force and migration mechanism of boundaries of martensite laths was considered in a 3%Co modified P911. The dimensions of second phase precipitations, martensite laths and dislocation densities were measured by means of transmission electron microscopy. The pinning forces ret…
Fischer-Tropsch 합성용 Co/ $Al_2O_3$ 촉매에서 알루미나 지지체에 인산 용액으로 알루미나 표면을 개질하여 촉매적 활성은 물론이고, 기계적 강도와 수열 안정성을 개선하였다. FT-IR과 같은 촉매 표면 분석법을 통하여 P 첨가로 알루미나 표면에 $AlPO_4$ 상이 생성되어 촉매인 코발트와 지지체인 알루미나 사이의 상호작용이 약화되어 촉매의 환원도가 높아졌음을 보였다. 이에 따른 촉매성능을 평가하기 위하여 $C_{5+}$ productivity와 turnover frequency를 계산하였다. 또한, 2 wt.% P 첨가 알루미나를 대상으로 지지…
Magnetic sensors are widely used in areas such as high-density magnetic recording, navigation, military and security, target detection and tracking, anti-theft systems, non-destructive testing, magnetic marking and labeling, geomagnetic measurements, space research, measurements of magnetic fields onboard spacecraft a…
Fine cemented carbide in the diameter of less than 1 μm is obtained activated tungsten oxide. The samples are characterized by laser particle size analyze, electron microscope and sclerometer. The experimental results show that the size of tungsten particles and tungsten carbide prepared with activated tungsten become…
The problem of a two-dimensional viscous fluid drop which steadily moves along a horizontal rigid surface is considered. Such motion arises if the rigid surface wettability is nonuniform. A sequence of solutions for the velocity field and the free surface shape with the successively increasing applicability region nea…
This paper presents a modelling strategy that combines neuro-fuzzy methods to dene the material model with cellular automata representations of the microstructure, all embedded within a nite element solver that can deal with the large deformations of metal processing technology. We use the acronymnf-CAFE as a label fo…
In this paper, corrosion behaviors of 13MnNiMoR steel and its weld joint in the EO reactor service environment were studied. Metallographic analysis and electrochemistry corrosion tests in boiler water which are concerned on different zone metal of 13MnNiMoR steel weld joint have been carried out, and the effect of po…
The presence of low-symmetry impurities or defect complexes in the zinc-blende direct-gap semiconductors (e.g. interstitials, DX-centers) results in a novel spin-orbit term in the effective Hamiltonian for the conduction band. The new extrinsic spin-orbit interaction is proportional to the matrix element of the defect…
The objective of this research was to investigate the effect of pH(7.0, 8.0, 9.0, 10.0) on the properties of soy protein isolate (SPI)/guar gum (GG)composite films casted with 0.2 %(w/v)guar gum polysaccharide, 5.0 %(w/v)SPI, 1.5 %(w/v)glycerol plasticizer, and 4:1(v/v) mixture of distilled water and anhydrous alcohol…
We have designed and fabricated a highperformance carbon nanotube (CNT) field emitter for a vacuum-sealed X-ray tube by a brazing process. The developed high-temperature endurable CNT emitters were vacuum-sealed in the diode and triode configurations, showing little degradation upon the brazing process and a good cold…
t is well known that alumina ceramics undergo a time dependent wear transition during sliding wear. The transition, which is associated with 1-2 orders of magnitude increase in specific wear rate, involves a change from mild wear to intergranular fracture. The transition is strongly grain size dependent, with the time…
The structure of coatings from composite material containing the SiC-Al 2 O 3 wear-resistant component and a Ni-Al metallic binder has been investigated. The coatings have been produced by the high-velocity air fuel deposition (HVAF) onto medium-carbon steel. The tribotechnical characteristics of these coatings have b…
Abstract Übergangsmetallschichtchalkogenide sind Graphenanaloga. Ihre elektronischen Eigenschaften lassen sie als Material für Elektroden und Transistoren geeignet erscheinen.
The experiments to study the feasibility to fabricate the 45 slant on p-type (100)-oriented silicon wafer were done. The various mask shapes, rectangular, cross, circle and boomerang, were patterned on the SiO2 mask by utilizing the conventional photolithography and dry etching process for investigating the anisotrop…
The megasonic cleaning efficiency is evaluated as a function of the angle of incidence of acoustic waves on a Si wafer. Acoustic Schlichting streaming alone is not able to remove nanoparticles smaller than 400 nm. It is shown that oscillating or collapsing behavior of bubbles are responsible for removing nanoparticles…
This article mainly introduced various properties of aloe fiber and yarn. Studies on properties of aloe fiber include the morphological structure, infrared spectrogram, fineness and single fiber strength. Studies on properties of aloe yarn include yarn strength, fineness uniformity, moisture content, yarn hairiness, a…