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。
Abstract Isothermal viscosities η (at low shear rates) of polyethylene oxide fractions and blends were measured in the range from the monomer (glycol) to a molecular weight of about 10 5 and at a number of temperatures between 9 and 155°C. The fashion in which η varied with temperature was independent of molecular wei…
CONTENTS 1. Influence of Spin–orbit Interaction on Resonance Effects 823 2. Combined Resonance with Band Carriers (General Analysis) 824 3. Combined Resonance with Band Carriers in Crystals of Different Symmetry. Discussion of First Experimental Results 828 4. Combined Resonance with Bound Carriers (General Analysis)…
Abstract A simple theory is developed for calculating the contribution from thermal diffuse scattering to the absorption of high energy electrons passing through crystals. The Einstein model for a vibrating crystal is used and the incident wave is assumed to be a Bloch wave, the thermally diffuse scattered wave to be…
A new compound, Na(6)Si(8)O(19), is shown to be a thermodynamically stable phase in the Na(2)O-SiO(2) system at 1 atmosphere. The new compound melts incongruently to SiO(2) (quartz) and liquid at 808 degrees +/- 2 degrees C, and it disproportionates to betaNa(2)Si(2)O(5) and quartz at 700 degrees +/- 10 degrees C.
Further calculations on N, H, NH, and NH3 are used as a guide for the selection, in general, of symmetry types and screening parameters of Gaussian atomic orbitals in an LCAO—SCF—CI scheme. The paper also examines the sensitivity of predicted valence properties to the choice of orbital basis and to the amount of confi…
Gallium nitride was found to sublime congruently from a torsion—effusion cell when the ratio of orifice area to sample area was about 1/30 and incongruently to yield nitrogen gas and liquid gallium when this ratio was about 1/100 or less. A mass-spectrometer investigation revealed no measurable concentrations of galli…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation John D. Hoffman, James J. Weeks; X‐Ray Study of Isothermal Thickening of Lamellae in Bulk Polyeth…
Radiation damage in diamond due to bombardment by 20-keV ${\mathrm{C}}^{+}$ ions is observed from measurements of the optical reflection and transmission coefficients at wavelengths of 450, 500, 550, 600, and $650 {m}_{\ensuremath{\mu}}$. These measurements are analyzed to obtain the depth, refractive index, and absor…
The x-ray coloration of synthetic calcium fluorophosphate (fluorapatite) crystals is shown to result from the presence of fluorine vacancy defects. Three of these defects have been studied by correlating their optical absorption bands with their electron-paramagnetic-resonance spectra, and by application of the electr…
New name for polypropylene film. ICI's balanced biaxially oriented polypropylene film is now being sold under the trade name Propafilm . This move emphasises the established position of this material for packaging by distinguishing the product from ICI propylene polymers and copolymers, which are sold under the trade…
In connection with a program to study the behavior of punctured fuel elements for the Tokai Atomic Power Reactor, the diffusion coefficient of fission gas in uranium oxide powder formed by CO2 oxidation of U was determined by post-irradiation experiment, in which the fractional release of fission gas during isothermal…
The lanthanum-aluminium system is found to contain six intermediate phases: LaaAI (hexagonal MgaCd type), LaAI (orthorhombic CeAI type), LaAh (cubic MgCU2 type), Lao.eaale.re (hexagonal AIB2 type) and LaAla (hexagonal MgaCd type); LaAl4 is orthorhombic at room temperature but is transformed into a tetragonal modificat…
The elastic behavior of plain and double knit fabrics was studied before and after laundering. Thirty-four fabrics were knit of 24/1, 20/1, and 16/1 cotton yarns. Elonga tion, recovery, and growth were determined by a manual method and by the Instron machine set at predetermined extension. Also, elongation and growth…
Summary A hydrated barium pyrochlore (pandaite) has been found at Mrima Hill (Kenya) in a residuum consisting mainly of goethite/limonite and gorceixite. The pandaite occurs as pale yellow or white octahedral crystals, which have a micro-crystalline interior. It is isotropic, the refractive index varies from 2·07 to 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure Property Relationships in Polyurethane Elastomers Prepared by One-Step ReactionK. W. Rausch Jr. and A. A. R. SayighCite this: Ind. Eng. Chem. Prod. Res. Dev. 1965, 4, 2, 92–98Publication Date (Print):June 1, 1965Publication History Published online1 May 2002Publish…
The room temperature luminescence spectra of the monoterpyridyl chelates of trivalent samarium, dysprosium and thulium have been studied in solid state by exciting with monochromatic radiation of 3200 Å. The spectra of these chelates show intra f → f fluorescent transitions of the chelated rare earth ions as well as t…
Abstract The effect of ozone on the growth of cuts in rubber strips subjected to repeated tensile deformations has been investigated. At tearing energies below a critical value ozone accounts for all the cut growth, and in this region the rate of growth also occurs due to mechanico‐oxidative rupture, the rate of this…
Abstract Thirteen dimensional parameters are suggested as necessary to describe a sedimentary particle, and a range of form indices is derived from these. The behavior of a particle depends on each form index which defines the particle and a general correlation can only be obtained by examining the performance versus…
The utility of ferrite cores which have the Curie temperature in the vicinity of the room temperature and suddenly change the permeability vs. temperature characteristic near the Curie temperature is described in this paper. Using the characteristics of these ferrite cores, the author made an overcurrent relay and a l…
SUMMARY The following marine chrysomonads, originally described by Carter, are redescribed: Pseudopedinella pyriforme, Ochromonas oblonga, and Pyrmnesium parvum. Parachrysiclalis n.g. is set up for P. estuariale, with a flattened body and 2 equal flagella inserted in the middle of one side. Redescribed Xanthophy‐cean…