Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
A theoretica study is made of damage effects by particle radiations in mater, and their dependence on energy, mass,, and charge number of an incoming particle, as well as on the composition of the medium. Typical examples of damage effects are the number of ion pairs formed in a gas, or the number of vacancies created…
A study of the oxidation of boron carbide powder has shown measurable reaction at temperatures as low as 250 °C with water vapor and 450 °C in dry air. Removal of the B 2 O 3 oxidation product by water vapor occurs at a rate in excess of the oxidation rate below 550°–600°C. The presence of B 2 O 3 on the B 4 C surface…
Furan resins were prepared by the polymerization of furfuryl alcohol with either acid or thermal catalysis. The effect of catalysts, solvents, polymerization time, and atmosphere were studied for their effects upon the chemical structure of the polymer produced. It has been found that, regardless of the technique empl…
The concept of a thermo-photo-voltaic (TPV) energy converter is introduced and the device compared with thermoelectric and thermionic converters. Features of the TPV converter are that the entire device is kept at room temperature; potential power densities on the order of 10 w/cm2, and potential conversion efficienci…
A large number of polycrystalline and amorphous materials ranging from pure metals to glassy polymers have been found to obey the relations α2E=150 [dyn cm−2°K−2]s at normal temperatures. The linear coefficient of expansion is denoted by α, Young's modulus by E, and s is a dimensionless spread factor (0.5<s&…
The effects of method of equilibration, soil-water ratio, pH, and temperature on the form and concentration of dissolved silica in soil-water mixtures were studied and some hypotheses concerning the role of soluble silica in soil development were evaluated in the light of the information obtained.Studies of methods of…
The effect of lithium addition on the flow stresses for basal and nonbasal slip in magnesium crystals has been investigated by tensile tests at various elevated temperatures, using Mg-Li alloy single crystals of h.c.p. structure. The critical resolved shear stress for basal slip is found to increase almost linearly wi…
The planar stress-strain relationships of a simple trellis in which the elements are pivoted together where they cross over one another, but which do not pass under and over one another, are presented. It is shown that these relationships are identical with those tor an anisotropic elastic lamina which does not displa…
Abstract Durch eine Reihe von neuen Strukturbestimmungen ist es möglich geworden, eine Systematik für die Rauminkremente und die Radien von negativ geladenen Ionen aufzustellen. 1. Die Rauminkremente sind in Reihen wie Ge − , As − , Se − , Br − praktisch konstant. Ein Vergleich mit den Atomvolumina ergibt, daß das Hin…
The inhibiting effect of pyridine and seven of its methyl derivatives on the corrosion of iron in O 2 ‐free, 6.08 N HCl at 35°C was determined. Corrosion rates were measured by colorimetric analysis for iron with mercaptoacetic acid. The relative inhibitor efficiency and cathodic potential shift increased with increas…
Thin organic polymer film specimens were prepared for electrical conductivity measurements by the glow discharge polymerization process. The experimental procedure for film preparation is described in detail. Data on film properties and deposition efficiencies (g/kwhr) are presented for their possible bearing on the p…
Abstract Melting temperature, enthalpy and entropy of a sample of highly isotactic polybutene‐1 in each of the three polymorphic modifications as yet recognized, are determined by the method of the depression of the melting point in the presence of diluents. Two diluents are chosen: α‐chloronaphthalene and decalin, as…
The voltage required to maintain local discharges on polluted insulation may increase with increase in discharge length, and if this voltage exceeds the supply voltage, the discharges extinguish without causing a flashover. An analysis based on this mechanism has been made for the simplified case of an insulator havin…
The potential decay curve of a passive nickel electrode on open circuit was followed in solutions of p H ranging from 0.4 to 1.4. The three arrest potentials observed in the decay curve correspond to the equilibrium potentials for the , , and the electrodes, respectively; the second potential is called the Flade poten…
X-ray diffraction from single crystals of polyacrylonitrile shows that the diffuse nature of the nonequatorial scattering maxima cannot be accounted for by crystal size. The theory of paracrystals may be used to set both an upper and a lower limit to the amount of lattice distortion and yields a plausible explanation…
When pure aluminum is passivated at constant applied voltage in solutions ranging from p H 0–7, the current density representing film growth falls during the first few seconds in a manner that is qualitatively and nearly quantitatively the same for all solutions. The fall of current is succeeded by a rise to a constan…
The anodic polarization curve, the static passive potential, and the behavior of the decay of the polarized passive potential of iron were examined in neutral boric acid/borate solutions with and without Fe ++ ion addition. It was found that the passivation potential is a function of the [Fe ++ ] and p H and correspon…
Abstract The iron transfer from sideramines to suitably chosen complexones (EDTA and similar compounds) has been studied optically. From the equilibrium constants of such exchange reactions the stability constants of Ferrioxamine B, Ferrioxaminc D 1 , Ferrioxamine E, Ferrichrom and Ferrichrysin have been deduced. For…
Abstract The aluminum ion bonds through oxygen to form a variety of functional groups underlying diverse properties of soils. One aluminum‐bond functional group provides the cation exchange site of soil layer silicate clays. Pauling's m‐rule of acid strength for oxy‐acids, (HO) n O m C, applied to the 2:1 layer silica…
The formation of and on different crystal planes of nickel, and of polycrystalline nickel, was studied in alkaline solution. Oxide films of less than two monolayers were reduced potentiostatically, then current‐potential curves were measured in the range −200 to 1600 mv at different rates of the linearly increasing po…