Materials Literature
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In presence of triphenylbenzylphosphonium bromide the inhibition rate of Armco iron corrosion in 20 % phosphoric acid solution rises at more than 90 %. The efficiency of this phosphonium salt as corrosion inhibitor of iron is showed by weight loss and electrochemical methods. Other wise these last show that the inhibi…
ABSTRACT NEPS and seed-coat fragments in cotton are a source of trouble in textile manufacturing and finishing, and detract from appearance in yarn and fabric. At the cotton gin, the gin stand is a significant contributor to neps in ginned lint. Experiments were conducted to determine the effect of gin stand feed rate…
Etude par diffraction RX. Avec un exces d'iodure, on observe la formation de complexes AgI 3 2− , mononucleaire, plan, triangulaire, Pour I/Ag faible, formation de complexes polynucleaires ou les atomes A g sont relies par des ponts d'iodures
The quality of high-carbon chromium bearing steel, SUJ2 (SAE52100), produced by the electric arc furnace (EF)-ladle furnace (LF)-Ruhrstahl-Heraeus vacuum degassing vessel (RH)-vertical type continuous caster (CC) process, including the effects of impurities and cold working on its fatigue life, was investigated. Beari…
Fe-16%Cr-17%Ni-0.1%P alloy specimens were irradiated with 28 MeV electrons to a dose of 6.0×1022 e/m2 at 77 K and the positron annihilation lifetime measurements were carried out to obtain the isochronal annealing behaviour of radiation-induced defects above room temperature. The three component analysis of lifetime s…
Etude des systemes Co−C, Ni−C et Co−Ni-C par analyse thermique differentielle, analyse de la teneur en carbone, equilibre heterogene, pression de vapeur. Analyse critique des donnees thermodynamiques disponibles
The hydrogen embrittlement of 145kgf/mm2-class high strength steel was evaluated, with the concomitant measurement of hydrogen absorbed during pretreatment and zinc plating of the steel using zincate bath with or without suspended silica particles. It was found that almost all of the absorbed hydrogen was located in t…
The formation and ionic conductivity of β-, β′′- and β′′′-alumina type ferrites in the systems Rb2O-Fe2O3 and Cs2O-Fe2O3 were studied. Rb+-β-ferrite was formed by heating powder mixtures of Rb2CO3⋅(6-6.5) α-Fe2O3 above 1200°C, while Rb+-β′′-ferrite was synthesized together with the β phase below 1150°C. Rb+-β′′′-ferri…
Many power system circuits contain iron cored coils, which are common nonlinear circuit elements. Systems engineers have to model these elements while studying such phenomena as inrush current, ferroresonance, subharmonics etc. The nonlinearity involved in these elements cannot be appropriately taken into account unle…
A method for computing transient eddy currents induced by the movement of magnets without iron materials, such as superconducting magnets, is proposed. The formulation is based on a finite-difference method utilizing only the electric vector potential of the T- Omega method. Meshing is done only for the 2-D thin condu…
Thirty-five papers presented at the University of Wales Institute of Science and Technology, Cardiff, UK Sept. 1987 conference discuss recent results and developments in thermoelectric energy conversion under the topics: general properties and behavior, measurement, applications, conversion. Annotat
The magnetomechanical behavior of ferromagnetic material is analyzed. The behavior is nonlinear because of the strong nonlinear B-H magnetization relation. Finite-element analyses of 2-D and 3-D magnetic field, magnetic torque, and deformation of a beam-plate arrangement and a circular tube are described. Experimental…
Conversion of the octaethyl-11-oxochlarin and octaethyl-7.17-dioXoisobacterioch10rininto their thio and dithio analogs using Lawesson's reagent is reported.Spectroscopic data, along with X-ray crystallographic data for the dithio compound and its dloxo precursor, are reported.Porphyrins and porphyrin derivatives beari…
MNDO and extended Hückel calculations on the electronic structure of BC3 based on structure (1) and the alternatives (2) and (3) suggest that (1) would be an insulator rather than show metallic conductivity but that structures (2) and (3) could explain its high conductivity.
Moxa was soaked in a mixed solvent of chloroform, methanol and water (5:5:1) at room temperature for 7 days, and the supernatant solution was separated into two layers by the addition of water. Heptatriacontane (C37H76), confirmed by measurements of 1H and 13C-NMR spectra and melting point, was obtained from the chlor…
A treatment which significantly increases the pulsed surface flashover potential of some insulator materials in vacuum is described. The flashover potential is measured by placing a short cylindrical sample between brass electrodes in a vacuum chamber at a pressure of 10/sup -4/ Pa and applying a high-voltage (HV) dou…
Space power requirements for future NASA and other United States missions will range from a few kilowatts to megawatts of electricity. Maximum efficiency is a key goal of any power system in order to minimize weight and size so that the space shuttle may be used a minimum number of times to put the power supply into o…
The various attributes of copper alloys and stainless steels for use in sea water handling systems have been compared. As an outcome of this, a 4-year test program was undertaken to establish the corrosion characteristics of various stainless steel alloys in their cast and wrought forms. To facilitate this work, a ful…
In the anhydrous crystal the discoid amphiphile TP6E02M (1) packs in tilted columns whereas in the more hydrated liquid crystal phases these columns are vertical.
The interface of a nematic 7CB - solid substrate has been studied by optical ellipsometry. The phase difference between 0 and E rays, Δ = δ p - δs, and the angle ψ = tan-1 | r p/rs | are measured as a function of incidence angle and temperature. To fit the experimental data, an exponential interfacial region having a…