Materials Literature
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Abstract A simple technique for the preparation of anions of polycyclic aromatic hydrocarbons is described. 1 H and 13 C NMR spectra of dianions of pyrene and derivatives of pyrene are reported and discussed. The electron density is greatest at the carbon atoms in the perimeter of the dianions. The presence of an elec…
Phase equilibrium calculations for solutions or mixtures of synthetic polymers become considerably more difficult when there is polydispersity of the polymers. To simplify the calculations, polydispersity is often neglected in the calculations or accounted for in a summary way only, and often only relatively simple fr…
The influence of grain boundary sliding on the mechanical behaviour of materials subject to creep at elevated temperatures has been investigated by a number of model analyses. Some models have focussed on the interaction of linearly viscous behaviour in the grain boundaries and power-law creep of the grains. It is fou…
The hardness of adamite roll materials for hot work rolls depends on their microstructures; the amount and hardness of coarse carbides and the hardness of matrix. The high-hardened adamite roll materials are excellent in wear resistance when the amount of coarse carbides is about 8%, but the wear resistance deteriorat…
In liquid or gaseous media, certain additives, called inhibitors, can occupy, via a strong binding energy to the base metal, atom sites on the metal surfaces, thus preventing a metal-hydrogen bond and thereby inhibiting the entry of hydrogen into the base metal. For both metallic and nonmetallic solid films, hydrogen…
A semiempirical formula which describes energy-space distributions of streamed neutrons and γ-rays in cylindrical ducts, is derived. In the proposed formula, the spatial distribution of radiation fluxes is approximated by three multiscattered components for neutrons, namely direct, doubly scattered, and eight-time sca…
An enhanced rate of transmembrane electron transfer across a lipid bilayer catalysed by a manganese porphyrin-linked quinone MnP(CO2Me)3-Cn-Q (n= 2, 3, 4, or 6) has been observed when n= 2, and a parallel quenching study of the free porphyrin-linked quinone has shown the crucial effect of the linkage length on the ele…
This paper describes two methods—one based on a simple measurement and another requiring a special instrument—for measuring the degree of stress-whitening in impacted propylene-ethylene block copolymer (PEBC) specimens. These methods have been applied to determine the response of PEBC specimens, containing various nuc…
X-ray diffraction experiments with lyotropic calamitic-nematic phases and induced lyotropic calamitic-cholesteric phases doped with brucine sulfate and d-octanol are performed. The diffraction pattern of the usual oriented nematic phase is compared with the patterns of the untwisted cholesteric phase. The analysis of…
4-X-4′-Fluorobenzophenones undergo the expected nucleophilic substitution reactions with the alkalimetal salts of 4-Y-4′-hydroxydiphenyl ethers at 140 °C in diphenyl sulphone as solvent: the Hammett ρ value is 1.02 for the X substituents and –0.34 for the Y substituents. The order of reactivity of the alkali metal sal…
The thermal conductivity of solid xenon is investigated for samples with fixed molar volumes. The relative excess of the experimentally obtained values of thermal conductivity over the values calculated by using the λ ∝ 1/T law is found to increase with temperature. The obtained results are compared with appropriately…
Neutrons produced by the D-T reaction have energies of 14.1 MeV. They deposit their energy while they are being slowed down, through various exothermic and endothermic reactions. Energy multiplication, defined as the ratio of released energy to the incident one in the blanket, has a sufficient probability of being inc…
SummaryOver 40 million tonnes of steel are coated with zinc or zinc alloys each year. The most important technique is hot dip galvanizing, which can be applied either to un fabricated sheet or wire, to tube (in automatic plants) or to fabricated articles. Other methods of applying zinc include spraying of the molten m…
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…