Materials Literature
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New instrumentation has been developed for in situ measurements of the electron beam- induced surface voltage of high resistivity spacecraft materials in an existing ultra-high vacuum electron emission analysis chamber. Design details, calibration and characterization measurements of the system are presented, showing…
The purpose of this study is to estimate the elastic modulus, strength and ductility of porous Ti6Al4 V alloy prepared by spark plasma sintering process using gas atomized powders. Porous alloys have nominally 0, 20, 30 and 40% porosities after sintering. Three-point bending test has been carried out to evaluate the e…
(100)-oriented epitaxial Fe3Si films grown (100) Si substrates with an epitaxial magnesia (MgO) buffer layer by rf-magnetron sputtering. X-ray pole figure measurements revealed that the Fe3Si layer is epitaxially grown on MgO buffer layer with an orientation relationship of Fe3Si(100) // MgO(100) with Fe3Si[011] // Mg…
In this study, the effect of shot peening on fatigue life of Al-Li 8090T3 thin plates, which are used in the production of structural components of high-speed ships, is investigated. It is shown how various manufacturing procedures influence fatigue life of shot-peened material. Surface cleaning and protecting have a…
Abstract Not Provided
The effective thermal conductivity of a Li4SiO4 pebble bed was measured by the hot wire method. The bare and silica-coated Nichrome heaters were used as the hot wires. At 975 K, effective thermal conductivity was not measured correctly by the bare hot wire. This is due to the fact that the electrical signal of a bare…
Crack-free magnesium joints of AZ31 magnesium alloy strips were produced using laser assisted self-piercing riveting (LSPR). Thermal analysis of LSPR, using modelling and temperature measurements by infra-red thermal imaging, indicated that the laser absorption was about 18 to 35% depending on the surface preparation…
Extensive test data exist on the ignitability of nonmetallic materials in pure oxygen, but these characteristics are not as well understood for lesser oxygen concentrations. In this study, autogenous ignition temperature testing and pneumatic impact testing were used to better understand the effects of oxygen concentr…
A completely new biosensor composed of cube-shaped Au core Co 3 O 4shell nanoparticles (Au core Co 3 O 4shell ), polyacrylic acid (PAA), and horseradish peroxidase (HRP) modifi ed fi lm electrode was fabricated for the fi rst time.The biocompatibility and electrochemical properties of the resulting Au core Co 3 O 4she…
fibre biofilm reactor (SBFFBR) was studied for the treatment of raw milk processing wastewater. The SBFFNR system was modified from a typical sequencing batch reactor (SBR) system by using eight simple flexible fibre bundles, which serve as support media for microorganisms. The reactor was operated under different inf…
A micromechanical model for 3D composites with an embedded periodic grid of generally orthotropic reinforcements is developed and applied to anisotropic structures with cubic, conical and diagonal reinforcement orientations to calculate effective elastic coefficients. The model allows flexibility in the design of such…
Two-phase NiTi base alloys (NiTi)_(50-0.5x)Nb_x (x=5,10,15,20) with both high damping capacity and high yield strength have been prepared by addition of Nb.With increasing Nb content,the fraction of eutectic (NiTi+β-Nb) increases,and yield strength in martensite state rises. When x=15,the yield strength reaches the hi…
The retarding field energy analyzer (RFEA) remains the more reliable diagnostic to measure the ion temperature in \nthe boundary plasmas of magnetic fusion devices. A compact, simple design RFEA have been developed for \ninvestigations on the tokamak ISTTOK and TJ-II stellarator. More recently a five-channel RFEA has…
2009, вып. 4 Разработка и анализ программных сценариев разрядов в плазме… 37 УДК 621.039.6 РАЗРАБОТКА И АНАЛИЗ ПРОГРАММНЫХ СЦЕНАРИЕВ РАЗРЯДОВ В ПЛАЗМЕ КАЗАХСТАНСКОГО МАТЕРИАЛОВЕДЧЕСКОГО ТОКАМАКА (КТМ) Э.А.Азизов, В.Н.Докука, Р.Р.Хайрутдинов (ГНЦ РФ ТРИНИТИ, Московская обл., Россия), А.Б.Минеев (НИИЭФА им.В.Д.Ефремова,…
In order to evaluate more objectively the performance of knitting yarns,a method using modified fuzzy kernel C-Means(FKCM) clustering algorithm for processing and analyzing dataset of knitting yarns is proposed,in which,the data of low dimension input space is mapped to high dimension feature space,FCM clustering algo…
Experiments were conducted on a 2-D scale real pebble-bed reactor core to study the pebble dynamics in a two-region pebble-bed high-temperature reactor core with fuel pebble and graphite pebble region.The dynamics related to the reactor core physical calculations and structural design were studied,including the two-re…
To improve needling property of the carbon fiber felt,dimethyl siloxane,imidazole and water-soluble dimethyl siloxane were used as the surface modification agent of fiber felt.Then the samples were prepared by using the same needling process.The SEM shows that the felt fibers are conglutinated each other after treated…
A improved technological process to the surface modification of a RB-SiC substrate mirror was proposed according to the material special properties of the large scale and complicated light weighted RB-SiC materials for space projects.Using a high energy Kaufman ion source for the Ion Beam Aided Deposition(IBAD),the su…
In recent years, poly (p-phenylene benzobisoxazole) (PBO) fibers have become prominent in high strength applications such as body armor, ropes and cables. This study compared the mechanical and chemical properties of yarns extracted from PBO body armor exposed to elevated temperature and moisture in the laboratory wit…
The process of formation and penetration against water-partitioned armor of explosively formed projectiles is studied.The flight characteristics and law of penetration are studied with high speed photography and electric probe technique.Experimental results showed that shaped charge with variational-wall-thickness hem…