Materials Literature
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Electron-bremsstrahlung cross-section values differential in photon energy and angle are given for a bombarding energy of 0.2 MeV. Measurements were made for photon energies from 0.02 to 0.06 MeV with a Ge(Li) spectrometer and from 0.06 to 0.2 MeV with a NaI-crystal-scintillation spectrometer for photon emission angle…
Abstract Calcined bauxite (RASC Grade from Guyana) has been demonstrated as an excellent, albeit expensive, aggregate material for road surfacing which has unique properties with regard to its performance under traffic. Its high wear resistance and anti‐skid properties have resulted in a dramatic decrease in the numbe…
Abstract The infrared spectra of chlorinated polypropylene (CPP) are interpreted and tentative assignments of C—Cl stretching vibration of CPP are proposed. Recently, infrared spectrophotometry has been applied as a useful tool for the investigation of polymer transitions. The solid‐state transition in isotactic polyp…
The type of peptidoglycan in the cell wall and the ability to transform auxotrophic mutants of Micrococcus luteus ATCC 27141 were determined for 55 strains of micrococci and related organisms. There exists a perfect correlation between these characteristics. Onlystrains containing the unique peptidoglycan of M. luteus…
In this first contribution the symmetry properties of the Fraunhofer diffraction phenomena at the apertures possessing a symmetry are discussed. These properties are used for the derivation of the wave function describing Fraunhofer diffraction at apertures of the form of regular polygons. Besides the general formula…
The series of the Rutherford scattering amplitude in terms of Coulomb phase shifts is divergent. This fact was known some time ago. Nevertheless, a misunderstanding has appeared and exists on this question. We try to explain how and why there is such misunderstanding. This divergent series has the property that, if on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular structure and shear viscosity. Isomeric hexanesLawrence D. Eicher and Bruno J. ZwolinskiCite this: J. Phys. Chem. 1972, 76, 22, 3295–3300Publication Date (Print):October 1, 1972Publication History Published online1 May 2002Published inissue 1 October 1972https://pu…
Two stainless-steel-clad mixed-oxide fuel elements have been examined after irradiation in EBR-II to a burnup of 11 at.%. The comparison of fuel of low oxygen-to-metal (O/M) ratio (1.94 to 1.97) with fuel of high O/M ratio (1.99 to 2.00) indicated significant differences in fuel and fission-product behavior. The lower…
Abstract Polybutadienes with molecular weights varying between 12,500 and 92,000 and containing from 23.4% to 93% 1,2‐structure were cured with 1 to 8 parts per hundred of dicumyl peroxide at temperatures ranging from 130° to 175°C. The cured samples were swollen in toluene and the crosslink densities were determined…
The effects of fast neutron irradiation on the tensile and creep-rupture ductility of austenitic stainless steels are presented. At low temperatures, below 450°C, radiation causes a reduction in the strain hardening exponent and thus the uniform strain. At high temperatures, above 750°C, reduced ductility results from…
The major portion of the clay fraction of the B horizons of the Bayswater soil, a podzol from Nova Scotia, consisted of an amorphous component that had the properties of allophane. The X-ray diffraction patterns, the infrared (IR) spectra, the Differential Thermal Analysis (DTA) curve, the Thermogravimetric Analysis (…
The use of standard deviation as a measure of line broadening in the Scherrer equation is justified on the grounds that, for commonly used approximating curves which can be fitted to X-ray line profiles, the line breadth at half intensity is directly proportional to the standard deviation of the fitted curve. If the c…
The stopping cross section of He ions in gold has been measured at incident energies from 0.4 MeV–1.9 MeV. A backscattering technique was used to measure the energy loss in gold films which had been vacuum evaporated on sapphire substrates. The stopping cross section results are compared with the previous data of Wilc…
Abstract The effect of uniaxial tensile stress at constant load in the range of 0 to 6.86 MN/m 2 upon the behavior of stabilized and unstabilized types of isotactic polypropylene was investigated in the course of thermo‐oxidative aging at 80° to 130°C and of photo‐oxidative aging in the Xenotest 450 apparatus at 45° a…
Electron microscope observations are presented to show that voids can be produced in molybdenum neutron-irradiated at low temperature (60°c) by post-irradiation annealing up to 900°c. These results contrast with previous extensive work on molybdenum subjected to similar combinations of irradiation and annealing condit…
The 1200°C isothermal section of the system CaO‐BaO‐WO 3 was studied in detail. The system contains one ternary compound, Ba 2 CaWO 6 , which can exist in binary equilibrium with BaO, CaO, Ba 3 WO 6 , Ba 2 WO 5 , BaWO 4 , and Ca 3 WO 6 . The composition range of solid solutions based on the ternary compound extends fr…
A new vacancies containing allotropic form of cobalt and magnesium orthophosphates has been prepared by solid-state exchange reaction, according to the model: 2CoLiPO 4 + Li 2 SO 4 → [Co 3 □](PO 4 ) 2 + CoSO 4 2MgLiPO 4 + Li 2 SO 4 → [Mg 3 □](PO 4 ) 2 + MgSO 4 . The structure of the new form was investigated and is sh…
Ammoniumparatungstate tetrahydrate (NH 4 ) 10 [H 2 W 12 O 42 ] · 4H 2 O crystallizes in space group P 2 1 / n , a = 15.08, b = 14.45, c = 11.00 Å, β = 109.40°, Z = 2. The W atoms were located by a Patterson map, the lighter atoms (21 O, 5NH 4 + , 2H 2 O per asymmetric unit) by a ΔF map. Using anisotropic temperature f…
Boron carbide is the prime candidate material for neutron absorbers in fast breeder reactors and the Fast Test Reactor. Important data required for design of control rods for these reactors concern swelling, gas release, and structural integrity of boron carbide under the expected operating conditions. Data for irradi…
Recently, treeing breakdown has been identified as an important factor controlling the long time breakdown of polymer insulation systems. However, due to its complicated nature, the mechanisms involved are not yet fully understood. Using experimental results from other investigators, together with our own, this paper…