Materials Literature
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Luna County mines have produced $8.64 million in minerals since the first recorded mining operations in 1876. The bulk of this production has been from lead-zinc-silver ores, but appreciable amounts of manganese, fluorspar, copper, and gold also have been mined. The principal producing districts of the past were the C…
The molecular weights and molecular weight distribution of a styrene–butadiene rubber produced at 5°C. according to an incrementally modified recipe with tert-dodecyl mercaptan modifier, do not differ significantly from those of similar conventionally modified rubbers. The limiting effect of diffusion upon the mass tr…
An investigation has been made of the electrical and mechanical characteristics of the insulation of samples of cables in the range of 60-230 kV after many years of operation in order to evaluate the influence of ageing on the dielectric of oil-filled cables. To determine the effect of thermal ageing alone and in comb…
C 30 QJ u without cracking (reference 1, p. 135). It is known that, up to a certain point, increasing the average molecular weight of a polymer will increase the strength of the filnls and give them greater ability to elongate. Therefore, the characterization of polymers through some measurement that indicates the ave…
Two long staple cottons, differing in fiber bundle break elongation but having other pertinent fiber properties substantially equal, were blended in different percentages to permit a study of the effects of break-elongation on yarn properties and spinning etbciency. Yarn strength and elongation were affected by fiber…
The solubilities of L-glutamic acid crystals in α-form and β-form in water were determined, and the results were formulated as follows.α-form: Log S=-0.377+0.0174t (t is from 0° to 30°C)Log S=-0.328+0.0153t (t is from 30° to 70°C)β-form: Log S=-0.461+0.0159tThe formula obtained for β-crystals showed a fair agreement w…
The suitability of niobium as the anode for solid electrolytic capacitors has been investigated. Field crystallization of the amorphous niobium oxide film has been found to be a determining factor for the properties of these capacitors. Purity of the porous anodes as dependent on the sintering conditions, formation te…
Reaction rates for lithium, calcium, strontium, and barium during 50–120 min of exposure to O 2 or N 2 were measured as a function of temperature and pressure by a manometric method. Many of the reaction rates were found to be exponential functions of time, but in some cases a linear rate law was found.
[Es wird nachgewiesen, dass Pseudosida szalayi Daday synonym ist mit P. bidentata Herrick. Latonopsis fasciculata Daday wird als Synonym von Pseudosida tridentata Herrick angesehen, die Benutzung des Namens P. tridentata jedoch abgelehnt, weil seine erste Anwendung einen Bruch der Nomenklaturregeln darstellte. Es wird…
The thermodynamic properties of solutions of in were determined by emf measurements over the concentration range unity to 10 −3 mole fraction and the temperature range 800° to 925°C. The solutions behaved nearly ideally under all conditions with small deviations, if any, in the positive direction. The solvent effect o…
J. D. Donaldson, W. Moser and W. B. Simpson, J. Chem. Soc., 1961, 839 DOI: 10.1039/JR9610000839
On the anodic passivation of metals, two different processes, (A) precipitation from a super-saturated solution and (B) direct reaction between a metal and solution, have been previously considered for the anodic formation of passive oxide film. Both of these mechanisms were criticized from the kinetic point of view t…
SYNOPSISThe morphology of pits in decorative nickel+chromium coatings resulting from service corrosion in an industrial atmosphere has been compared with that of pits produced in accelerated corrosion tests. Corrosion in the three accelerated tests examined and in the early stages of service corrosion was frequently c…
Studies have been made on the problems of the glass formation range, which are important as the fundamental data for the science and industry of glass, and the systematic investigation of which has never been carried out.Borate systems were studied using, except B2O3, the oxides of 16 a-group elements-Li, Na, K, Be, M…
W. G. Palmer, J. Chem. Soc., 1961, 1552 DOI: 10.1039/JR9610001552
The importance of suitable seeds in dendritic growth of long ribbons of semiconductors is discussed, and investigations to determine the characteristics of suitable seeds are reported. Studies of growth buttons have yielded information about the initiation of spontaneous and also controlled dendritic growth from butto…
When solid heterocyclic dicarboxylic acids and their hexamethylenediammonium salts are heated in a sealed system, temperature‐pressure diagrams are obtained which allow the determination of the exact temperature at which decarboxylation starts. Some decarboxylation points are indicated.
A tracer study has been made of the polymerization of acrylonitrile in an aqueous solution at 25°C with the use of radioactive K2S352O8 and NaHS35O3 in a redox catalyst system. Persulfate and bisulfite give sulfate and sulfonate endgroups, respectively. The contents of these endgroups in the polymer were determined an…
The crystal structure of CuOHCl has been determined by X‐ray single crystal methods. The structure was refined by F OURIER methods and by three‐dimensional « least square» treatment. CuOHCl has a monoclinic cell with
It is demonstrated that the presence of surface oxide films on aluminum, prior to anodizing in a pore‐forming electrolyte, can reduce the number of surface pores and the surface roughness compared to that normally obtained with fresh aluminum surfaces. Electron micrographs show that, in such a case, porous anodization…