Materials Literature
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During heat‐treatment of anodic in vacuum (10 −5 Torr) at temperatures in the range from 200° to 700°C oxygen exchange between the anodic oxide, the Ta substrate, and the atmosphere was observed. Galvanostatic reanodization experiments resulted in potential‐time (charge) curves which could be used to determine the oxi…
The new compound, UOF4, has been prepared by the reaction of UF6 with H2O in a HF slurry.
Abstract New amino aromatic esters and ethers of cellulose were synthetized. Then grafting processes were performed on these derivatives by using acrylic, methacrylic and N‐vinyl pyrolidone monomers. Finally, chemical structure and physicomechanical properties were determined. Industrial experiments proved the utility…
The Symposium on Localized Corrosion—Cause of Metal Fatigue was presented at the Seventy-fourth Annual Meeting of the American Society for Testing and Materials held in Atlantic City, N. J, 27 June-2 July 1971. The sponsor of this symposium was Comm
Electrolytic effects, crystal coloration, and charge storage observed when an electric field is applied to single crystals of calcium orthovanadate at temperatures above 700 °C are shown to be associated with oxygen migration and the creation of V 4+ centers in the crystal. The oxygen transport number is shown to be c…
By an insulating film we mean one which passes little or no electric current on the application of a voltage across it. If the film were a single crystal of pure material this would require it to have a bandgap of 2 eV or more, so that there would be few intrinsic carriers over a practical temperature range. In practi…
Anodic pit generation and pit growth of stainless steel at constant potential in a sulphuric acid solution containing chloride ion have been investigated by use of a rotating electrode. The electrode rotation makes the generation and growth of pits very stable and enables the pit generation frequency and the pitting c…
The heat capacity and the enthalpy of the quantitative thermal decomposition of crystalline Au2O3 have been measured by differential scanning calorimetry. A value of –13.0±2.4 kJ mol–1 is calculated for ΔfH⊖(Au2O3,s).
Interactions of calcium ions with uncharged sugars lead to complexes in which the calcium ions are surrounded by square-antiprism co-ordination shells composed of water molecules and sugar hydroxyl groups.
Stress corrosion crack growth rates (dA/dT) as a function of stress intensity factor (K) were determined over a wide range of electrode potentials for AISI 4340 steel (200-ksi yield strength level) in deaerated 3.5 percent sodium chloride solution buffered to pH 3.8. Particular emphasis was placed on conducting the st…
The state of stresses and displacements in thin films due to the presence of a periodic distribution of screw dislocations and edge dislocations is investigated by the method of continuously distributed dislocations and the three-dimensional theory of elasticity. The dislocations are straight and pierce obliquely the…
Abstract Changes in the internal morphology of lint cotton fibers during purification and swelling treatments were investigated by measurement of nitrogen adsorption at liquid nitrogen temperature. Surface areas and pore size distributions were calculated from the adsorption isotherms and compared with findings from m…
Abstract The vapour pressure curve of liquid potassium was measured up to the critical point which was found at T crit = 1925 °C ± 30 and P crit = 155 ± 15 bar. Using these vapour pressure data and existing density data of the vapour and liquid at saturation pressure the vaporization entropy of potassium as a function…
Continuing preceding research on this field, angular distributions of η and δ electrons from thin films of Al and Au have been investigated by means of a considerably improved apparatus. Measurements have been made in forward and backward directions with primary energies in the interval 1 to 20 keV with normal as well…
The amounts of strontium and calcium in the lead-bearing barite from hydrothermal solution were found to increase with the lead content of the barite. This fact suggests that the difference between DMPbSO4 = [M/Pb]PbSO4/[M/Pb]aq and DMBaSO4 = [M/Ba]Baso4/[M/Ba]aq primarily contributes to the increment of both trace el…
Hysteresis in a ferromagnetic material subjected to cyclic magnetisation is represented by an idealised elliptical B/H loop which neglects harmonic quantities and enables the flux density and the magnetising force to be related by complex permeability. The concept is then developed for steels with nonlinear magnetisat…
Abstract not Available.
An electrostatic-fluxmeter probe has been used to obtain a direct measurement of the electric field at a cylindrical conductor during a.c. corona. For conductor diameters of 1.59, 2 and 2.75 cm, the resultant electric field falls below the onset level for both positive and negative corona. For the positive discharge,…
Халькогениды переходных металлов со слоистой структурой и особенности заполнения их бриллюэновой зоны, Калихман В.Л., Уманский Я.С.
Nicandra physaloides(Solanaceae) contains four new methyl steroid, relatives (1)–(4), all containing an aromatic ring D; the constituion of the first is demonstrated by crystallographic analysis using direct methods.