Materials Literature
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Nickel was systematically substituted for cobalt in Waspaloy. M'echanical test results indicate that lower cobalt has little effect on tensile properties, but adversely affects creep rate and stress rupture life. Phase extraction studies found slight decreases in gamma prime volume fractions and increased M'23C6 carbi…
Related optical and detector properties of the PbS-Si heterojunction (HJ) are presented and discussed. A direct optical bandgap at 300 K of 0.44 eV has been measured for PbS-Si versus 0.42 eV for PbS-sapphire. The HJ photocurrent frequency response has been determined to consist of two waveform components: Type A, a "…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on Thermal Degradation of Synthetic Polymers. 12. Kinetic Approach to Intensity Function Concerning Pyrolysis Condition for Polyethylene Low PolymerTakashi Sawaguchi, Tatsuo Inami, Takeshi Kuroki, and Tadashi IkermuraCite this: Ind. Eng. Chem. Process Des. Dev. 1980,…
Treatment of heptaethyl(vinyl)porphyrin (1) with acidified nitrite solution gives a greenish porphyrin which is shown to be 21(E)-3,7,8,12,13,17,18-heptaethyl-2-(2-nitrovinyl)porphyrin, (2). Protoporphyrin dimethyl ester (3) similarly treated gives a mixture of compounds, including two greenish porphyries which are fo…
An apparatus was deviced for the analysis of CO2, CO and NO in the small amount of the gas sampled around the coke specimen during combustion. The conversion ratio of organic nitrogen in coke to NO was calculated from the analytical results of these gases.According to the analysis of the conversion ratio, the reaction…
Glycoside H2, C56H92O25, [α]D -25.9°(MeOH), which causes marked potentiation of the effect of NGF (nerve growth factor), was isolated from Bei-Wujiapi (the cortex of Periploca sepium BGE., Asclepiadaceae) and its chemical structure was established to be ⊿5-pregnene-3β, 16α, 20α-triol 3-O-[2-O-acetyl-β-D-digitalo…
57Fe Mössbauer studies of HoFe2 and DyFe2 at various temperatures exhibit a small but definite asymmetry in the peak positions as well as in the peak widths. The symmetry in the line widths suggests that the magnetization deviates from [100] direction, whereas the asymmetry in the peak positions can arise either due t…
Abstract Single crystals of rare‐earth (La‐Nd, Sm, Gd) and Y dititanates have been grown either by the method of direct high frequency heating in cold container or/and floating zone optical technique. The crystals Ce 2 Ti 2 O 7 and Pr 2 Ti 2 O 7 belong to the structural type of Ca 2 Nb 2 O 7 and possess dielectric and…
Cu-Pd-Ag alloys were aged with the isochronic ageing method after quenching from the solid solution temperature into ice water. The hardness test, electrical resistivity measurement and X-ray diffraction analysis were performed to investigate the ageing characteristics. It was found that there were three different har…
Polycrystalline films of BaTi03 with ferroelectric properties are regularly observed for films thicker than 1000 Å which have been rf-sputtered deposited at 5 Å/min onto silicon substrates at temperatures above 500°C. A 2000 Å thick film deposited under these conditions typically exhibits a counter-clockwise hysteresi…
New data on the physical and chemical characteristics of the UICC standard reference samples are presented. Aspects such as fibre length and diameter distribution, composition and special electrical and magnetic properties are covered. The possibility of preparing samples with graded characteristics is raised. A new e…
An experimental study of the residual stresses and fatigue properties of ground En 31 steel specimens is described. The individual grinding parameters (wheel types and speed, feed, dressing, and lubricant) are grouped into three categories: abusive, conventional, and gentle grinding. In the absence of high temperature…
Nine members of each of two homologous series of esters, the 4-(2′-pyridyl)phenyl and the 4-(4′-pyridyl)phenyl 4″-n-alkoxybenzoates, have been prepared and their liquid crystal transition temperatures measured. Both homologous series were investigated by differential thermal analysis and the enthalpy changes at the va…
Calcium sulfide disks have been carefully prepared to avoid any contamination by means of a newly-developed sintering method. The electrical conductivity has been measured at temperatures from 923 to 1173 K and in the PH2S⁄PH2 range from 0 to 102 with the aid of an alternating current bridge. Because the conductivity…
The solution of H2(D2) in a series of Pd3P1–x compounds has been investigated for x between 0 and 0.20. H2 solubility is significant for compounds with a large degree of non-stoichiometry and negligible for the stoichiometric compound. A lattice parameter anomaly occurs at x= 0.08 for the H-free phosphides; the crysta…
This paper analyses the frequency response of HV test transformers. A single transformer or a cascade arrangement has been found to behave as a tuned filter with the peak frequencies between 150 Hz and 1 kHz well in the range of low-order harmonics. In consequence, the HV side presents distorted waveforms which cause…
A new analysis of the 116 K single-crystal X-ray diffraction data set of good accuracy on β-phthalocyaninatomanganese(II) has yielded individual 3d and 4s orbital populations on the manganese atom of significant accuracy and qualitative estimates of bonding electron density in the macrocycle ring. The manganese orbita…
A case is presented for the use of an Impact Soil Test as an alternative to CBR. A comparison of the two methods in both terms of concept and procedure is made and a correlation based both on general observations and on a series of laboratory tests is indicated.
Abstract N-(4-Alkoxybenzylidene)-4-halogenoanilines have been synthesized, and the phase transitions determined using a differential scanning calorimeter and a polarizing microscope. Smectic and nematic phases have been observed for fluoro and chloro derivatives whereas bromo and iodo derivatives exhibit only a smecti…
The interpretation of the configurations 4 f N 6 s and 4 f N 5 d has been improved by using complete matrices for N = 6 and N = 8. Generalized constants which describe the evolution of the electrostatic parameters as a function of N have been fitted by the least-squares method, from 492 energy levels of second spectra…