Materials Literature
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Critical pitting potential and protection potentials were measured potentiodynamically in 0.1N NaCl solution vibrated by a 200 kHz ultrasonic wave. The critical pitting potential was more noble in this environment than in a hydrostatic solution. This fact was confirmed potentiostatically. In hydrostatic solution, the…
Six ethionine-resistant (Etr) regulatory mutants of Saccharomycopsis lipolytica Sl/1 overproducing methionine have been isolated. Five of them are also resistant to seleno-methionine. The activity of homocysteine synthase (O-acetyl-L-hormoserine-acetate lyase, adding hydrogen sulfide) is derepressed in these mutants a…
Results of 16-year tests of metals in tropical sea water total and intermittent immersion and atmospheres are reported. Data are tabulated on carbon and low-alloy steels, alpha and beta brasses, bronzes, NiCu and CuNi, austenitic stainless steels, and commercially pure Al, Cu, Ni, Pb, and Zn, both as single metals and…
Liquid crystals represent states of matter that are intermediate between the crystalline solid and the amorphous liquid. There has been a considerable growth of interest in these mesomorphic states in recent years, partly because of their important applications in display technology. This review article deals with the…
Fine structure, density, and some mechanical properties have been studied in jute fiber dried differently after retting. It is observed that the fiber has a less compact structure before under-going any drying processes after retting. Formation of hydrogen bonding during subsequent drying seems to be the cause of subs…
Abstract The effect of annealing on the microstructure of commercial grade poly(vinyl chloride) was investigated by calorimetric, X‐ray and viscoelastic measurements. The degree of crystallinity increases with increasing annealing temperature from above the glass transition temperature up to 130°C, at which point the…
Abstract Es wird über Neutronenbeugungsstrukturanalysen an den Kristallpulvern von Verbindungen Ba 2 CuWO 6 und Sr 2 CuB VI O 6 (B VI : W, Te) sowie zweier mit Zn 2+ auf der Cu 2+ ‐Position verdünnter Mischkristalle berichtet, die in Jahn‐Teller‐verzerrten Varianten des Elpasolith‐Typs kristallisieren. Die CuO 6 ‐Okta…
This paper describes a model of relaxed plain weft-knitting and, by consideration of the forces acting between loops, both in the interlacing region and at possible course- and wale-jamming points, derives equations whose numerical solution gives the loop shape, fabric dimensions, and magnitudes of the forces and coup…
Details of the electronic bands near the Si–SiO2 interface were examined by the technique of determining the field dependence of the threshold Φ (ε) for internal photoemission. From a measurement of Φ (ε), the conduction band bottom φ (x) in the SiO2 was obtained to within approximately two lattice units of the interf…
The conductive properties of carbon black filled polymers have already found many qualitative applications while quantitative ones remain infrequent because of the number of unexpected parameters which influence the conductance of samples of the material. We have tried to connect the anomalous electrical behaviour of…
Using the concept of thermally activated mobility, a theory is developed to calculate the thermally stimulated current (TSC) in hopping systems as a function of temperature. Unlike the existing theories which describe only the band transport systems, the present theory is applicable to both band and hopping transport…
Abstract Polychloroprene, or neoprene, has been commercially available since 1932. Through the years the use of these polymers has continued to increase to an annual worldwide consumption of almost 300 000 metric tons (660 million pounds, Table I). This represents about 5% of the world market for elastomer. Polychloro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization of Phenylacetylenes. 4. Effects of Tetraphenyltin and Initiation Mechanism in the WCl6-Catalyzed PolymerizationToshio Masuda, Kim-Quan Thieu, Noriaki Sasaki, and Toshinobu HigashimuraCite this: Macromolecules 1976, 9, 4, 661–664Publication Date (Print):July 1,…
Conductivity was measured for Li 4 SiO 4 and its solid solutions with Li 4 GeO 4 over a wide frequency range to separate clearly the effects of electrode polarization, conductance relaxations, etc., and to obtain true “dc” conductivities. The conductivities of all the electrolytes are markedly temperature‐dependent, r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo heteropoly anions containing organic groups. Crystal and molecular structures of ammonium pentamolybdobis(methylphosphonate) pentahydrate, (NH4)4[(CH3P)2Mo5O21].cntdot.5H2O, and sodium tetramethylammonium pentamolybdobis(ethylammoniumphosphonate) pentahydrate, Na[N(CH3)4…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrigonal-prismatic vs. octahedral coordination in a series of tris(benzene-1,2-dithiolato) complexes. 1. Crystal and molecular structure of tris(benzene-1,2-dithiolato)molybdenum(VI), Mo(S2C6H4)3Martin. Cowie and Michael J. BennettCite this: Inorg. Chem. 1976, 15, 7, 1584–15…
Abstract The core and valence energy levels of a series of poly(alkyl methacrylates) have been studied by ESCA. Surface compositions have been determined both from a comparison of area ratios for the O 1 s and C 1 s core levels and from the relative areas for the individual component peaks for these levels. The eviden…
Abstract Equilibrium data for the sorption of oxygen, nitrogen, carbon monoxide, and methane in 5A molecular sieve are analyzed in terms of a simple theoretical model isotherm. The model provides an excellent correlation of the single‐component isotherms over the entire concentration range, and it is shown that equili…
Single crystal samples of reduced rutile used as anodes in a photoelectrochemical cell with show significant changes with use. Saturated photocurrent as a function of illumination wavelength and differential capacitance as a function of anode half‐cell voltage were measured before and after varying periods of operatio…
The temperature-dependent diffuse critical scattering associated with the Verwey ordering (${T}_{V}=122$ K) in magnetite (${\mathrm{Fe}}_{3}$${\mathrm{O}}_{4}$) is extensively studied by means of neutron scattering experiments. The $q$ dependence of the scattering reveals that it is planar in nature and shown to arise…