Materials Literature
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The plastic deformation of type II diamond plates has been examined by three-point loading at temperatures between 1700 and 1550°c. Plastic bending was produced at 1700°c but the degree of bending at a particular stress was less than with experiments at 1800°c which have been reported. No plastic deformation was detec…
The semiconductivity and photoconductivity of the solid free radicals galvinoxyl (2,6-di-tert-butyl-α(3,5-di-tert-butyl-4-oxo-2,5-cyclohexadien-1-ylidene) p-tolyloxy radical) and DPPH (α,α-diphenyl-β-picryl hydrazyl) and related compounds have been examined. Their behaviour is similar to that of diamagnetic poly-cycli…
Matthew H. Hohn, Joan Hellerman, New Diatoms from the Lewes-Rehoboth Canal, Delaware and Chesapeake Bay Area of Baltimore, Maryland, Transactions of the American Microscopical Society, Vol. 85, No. 1 (Jan., 1966), pp. 115-130
Abstract Des mesures du temps de retournement en régime impulsionnel ont été faites et mettent en évidence, à faibles champs, un retournement en deux temps. D'autre part, de nouvelles mesures du champ coercitif sont également présentées.
The prediction of ligand-field theory that for low-spin octahedral complexes the size should decrease along the series Cr(III), Mn(III), Fe(III), and Co(III) has been examined by comparing the lattice constants of the complex cyanides of formula K3MIII(CN)6; a steady decrease along the series provides substantial evid…
La liberté d’orientation dans trois dérivés hexasubstitués du benzène, le pentaehlorotoluène (PCT), le tétrachloroparaxvlène (TCPX) et le pentaehlorobenzène thiol (PCBT), a été étudiée par résonance magnétique nucléaire de — 175 °C à + 50 °C et, pour le PCBT seulement, par des mesures diélectriques de — 90 °C à +50 °C…
R. L. N. Harris, A. W. Johnson and I. T. Kay, Q. Rev. Chem. Soc., 1966, 20, 211 DOI: 10.1039/QR9662000211
Abstract Audio frequency dielectric constant data versus temperature data for poly(vinyl chloride) exhibit a high temperature (glass) transition which becomes steeper and reaches higher values as the frequency is reduced. The same trend is demonstrated for a series of chlorinated poly(vinyl chlorides) although the tra…
The study of inert-gas behaviour with respect to metals has a history almost as long as that of the inert gases themselves, reference to the permeation of helium through a number of metals having been made in 1897, less than two years after the isolation of the new element.
X-Irradiation of single crystals of carboxymethyltriphenylphosphonium chloride produces the corresponding oriented phosphorane radical-cation Ph3[graphic omitted]ĊH·CO2H. The spectrum has been analysed to yield the hyperfine coupling tensors of the 1H and 31P nuclei and the g-tensor. These values are discussed in term…
Cylindrotheca fusiformis, a marine pennate diatom, requires boron for growth both in the light and in the dark. A synthetic saline nutrient medium and plastic containers were used to demonstrate the boron requirement. A boron concentration of at least 0.5 ppm supports the maximum growth-rate, with a generation time of…
Viscosity and density data were obtained up to 1700°C for a series of binary aluminoborate melts that contained as much as 15 mole% (∼21 wt%) Al 2 O 3 and up to 1620°C for pure molten B 2 O 3 . Large expansion coefficient decreases and a slight activation energy increase for B 2 O 3 above 1400°C suggested a tightening…
The rate of growth and properties of the first layer of compact to form are important for elucidation of the oxidation reaction for niobium. It was found possible to maintain this oxide in contact with the metal for sufficient time in the temperature range 720°–825°C to make measurements of its growth rate at various…
Abstract The phenomena accompanying the flow of an electric current through uniaxially compressed plates of intrinsic Ge are investigated. The plates are cut with definite orientations relative to the main crystallographic axes so that the directions of the current and field do not coincide. Under these conditions tra…
V204～V206系平衡状態図のうち,V～V204系は多くの研究者によって詳細に研究されているが,V204～V205系については,完全な平衡状態図は完成されていな炉。そこで著者らは,X線解析と示差熱分析とを用いて,V204～V205系状態図を決定した.その結果,V204～V205の中間に,V8O13,V307の二相が存在し,それぞれ710°,680℃の包晶温度を持つことを確認した。またV307,V205は非常に狭い固溶領域を持つことがわかった。さらにV6O13,V307,V205の比抵抗と帯磁率を測定して比較検討した。新しい相V307は,-200°～+200℃の温膵範囲で,常磁性を示し,-200°～0℃の温度範囲で・他の相より大き…
{10\bar11} transformation twins, produced in the martensite of commercially pure titanium, have been investigated by means of transmission electron microscopy and discussed in relation to the character of the martensitic transformation. The results are as follows: (1) The twins have a thickness of 250∼3000 Å, and they…
Electron spin resonance (e.s.r.) spectra of dilute fluid and rigid aqueous solutions of [Cr(CN)5NO]3–, [Cr(NO)(NH3)5]2+, and [Cr(NO)(H2O)5]2+ have been measured. [Cr(NO)(H2O)5]2+ appears axially symmetric with g⊥ considerably larger than g∥; 53Cr and 14N hyperfine structure has been observed for this complex. In contr…
Potentiostatic methods have been used to investigate the kinetics of electrodeposition of NiOOH from buffered acetate solutions. The dependence of the rate constants governing crystal growth upon potential, pH, and Ni2+ ion concentration has been measured. The initial formation of a very thin oxide layer by three-dime…
A method and technical details are described for direct observation of effects of high amplitude ultrasonic stress waves on dislocations in metal crystals. The technique combines, for the first time, ultrasonic treatment at high acoustic energy densities (up to 109 ergs/cm3 at frequencies between 30 and 100 kc), obser…
Inter-fibre frictional forces, F, corresponding to normal loads, R, of up to 300 g, experimentally determined for a large number of fibres, mostly cottons, rayons, and polynosic rayons, conform to a general expression of the form F = αRn . The parameters α and n are, however, shown to be interdependent, correlations a…