Materials Literature
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The X-ray diffraction analysis of 75 thin volcanic clay bands in the Lower Cretaceous of the Peace River coalfield shows kaolinite and mixed-layer illite–smectite to be the two clay minerals present. Kaolinite is dominant in the clay bands (tonsteins) in the coal-bearing Gething and Gates formations, whereas illite–sm…
A methodology for predicting the expected combined stochastic radiobiological effects of sequential exposure to different ionizing radiations is used to arrive at a methodology for predicting the radiobiological effects of simultaneous exposure. Both methodologies require developing additive-damage dose-effect models.…
The feasibility of using polarized deuterium (D) and tritium (T) plasmas in fusion reactors may be seriously affected by recycling in material walls. Theoretical and experimental results are reviewed which show how the depolarization rates of absorbed D and T depend on first wall parameters such as the temperature, th…
Abstract A method is described for the quantitative analysis of bulk specimens without standards by using peak‐to‐local background ratios in energy‐dispersive electron probe microanalysis. Theoretical transport investigations have been used to derive an expression for the absolute determination of ( P / B ) ratios. Ac…
Abstract Single crystals of LaOCl have been grown from molten LaCl 3 by a slow cooling technique. The Raman spectra of these crystals have been recorded and the frequencies and symmetries of the different lines determined by means of polarized Raman scattering.
Abstract The tensile stress—strain curves of various types of polyethylene were compared from 77 to 298 K in nitrogen, isopentane, and the inert environment of helium at various strain rates. It was found that in general polyethylene crazes in a gas such as nitrogen at a temperature below 1.6 times its boiling point a…
On decrit le processus de fabrication et on etudie les proprietes physico-mecaniques de panneaux de particules de pin a liant ciment: densite, absorption d'eau, stabilite dimensionnelle, resistances a la flexion et a la compression
Far-infrared (FIR) spectra of linear and cross-linked polymers have been obtained and analyzed. The relationship of the parameters of these spectra to the characteristics of macromolecules is established. The role of molecular interactions in the formation of potential barriers to libration of polar groups and the low…
In contrast to wild-type cells, the Bacillus subtilis mutant SF109 that lacks the active 2-ketoglutarate dehydrogenase enzymatic complex is unable to increase the specific activity of two enzymes subject to glucose catabolite repression, aconitase and histidase, during limitation of growth by glucose. Examination of t…
Current industrial practice for the determination of free acid in hydrometallurgical zinc processing solutions has been reviewed in a critical manner. Most of the methods are unable to overcome entirely the problems presented by high concentrations of various hydrolyzable metal ions. Because zinc processing solutions…
Myelography of the lumbar and lower thoracic spine was performed in 46 patients (23 using metrizamide and 23 using iohexol) as a parallel double blind randomized study. Neurological examinations, laboratory testing, and EEG studies were performed before and after myelography, and side effects were recorded. On compari…
Abstract The use of non destructive depth profiling by emission angle dependent XPS analysis is demonstrated for a thin contamination layer consisting of carbon, hydrogen and hydride‐bonded oxygen on top of an anodic oxide of Nb 2 O 5 on Nb. Using a double‐pass CMA with an angle resolved aperture and measured intensit…
The staining properties of chromoxane cyanine R (Colour Index No. 43820, Mordant blue 3; also known as eriochrome cyanine R and solochrome cyanine R) have been studied. Used alone, the dye imparted its red colour to nuclei, cytoplasm and collagen. The dye was extracted by mild alkali but not by acids. Stainability req…
In this paper a dynamic model of ac source-insulator interaction during the critical arcing period of polluted high-voltage insulators is developed. The simulation accounts for arc dynamics, arc motion over the contaminated insulator surface, dielectric recovery and restrikes as well as the most relevant parameters of…
Abstract Droplets with different sizes scatter light at different wavelengths. A droplet size index (R) was developed for predicting emulsion stability and absorbance of light at 660 nm was used to evaluate the opacity of the system. Various cloudy agents were tested on both stability and cloudiness of emulsions. The…
Abstract The blue colored complex between poly(vinyl alcohol) (PVA) and iodine was prepared at 5°C by mixing an aqueous solution of PVA with an aqueous ethanolic solution of iodine containing boric acid. The absorption spectrum of the system shows bands at 226 nm (A), 290 nm (B), 355 nm (C), and 650 nm (D). Their rela…
The chemical interaction between solid and liquid Zircaloy-4 and solid UO2 was examined in the temperature region 1000 to 2000°C in argon. The solid/solid reaction experiments were performed with short light water reactor fuel rod sections with an external pressure of 1 to 80 bar. The annealing times varied between 60…
Als bisher größter CuS‐Cluster nimmt [Cu 12 S 8 ] 4⊖ eine Sonderstellung ein. Er ist der erste isolierte Kupfer(I)‐Komplex mit ausschließlich sulfidischen Liganden. Das Ph 4 P‐Salz bildet sich bei der Umsetzung von CuCl 2 ·2 H 2 O mit EtS ⊖ und Li 2 S in Gegenwart von Ph 4 PBr. magnified image
Studies have been made of the polarization and depolarization behavior for lead lanthanum zirconate titanate ceramics with zirconia: titania ratio 0.65/0. 35 and La2O3 content from 0.07 to 0.095 (7:65:35 to 9. 5:65:35). Continuity of the dielectric dispersion on cooling unbiased freshly de-aged samples suggests that a…
Anharmonic thermal vibrations of atoms in MgA120 4 spinel (Fd3m, Z = 4) have been studied using sets of accurate X-ray diffraction intensities of Bragg reflections at temperatures up to 1933 K. The study was initiated by refining the temperature factor T(Q) of each atom in the form of the second-rank tensor/3~j, the e…