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 Monomolecular layers of methyl methacrylate inserted between the lamellae of montmorillonite clay were polymerized. Finely divided complexes of poly(methyl methacrylate)–montmorillonite were suspended in boiling hydrocarbons and subjected to thermal degradation at 215°C. and above, under air and nitrogen, wit…
J. M. Ziman London: Cambridge University Press. 1964. Pp. 360. Price 45s. This book is essentially an account of the consequences of the lattice periodicity in solids. Much of the ground was well tilled in the author's treatise Electrons and Phonons (Oxford: The Clarendon Press, 1962) but, as a textbook, the new work…
Fabric and mineral analysis of soils , Fabric and mineral analysis of soils , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
A molecular-kinetic theory, which explains the temperature dependence of relaxation behavior in glass-forming liquids in terms of the temperature variation of the size of the cooperatively rearranging region, is presented. The size of this cooperatively rearranging region is shown to be determined by configuration res…
Abstract Copolymerization of phenyl isocyanate with ethylene oxide was investigated under several conditions. The polymers obtained with AlEt 3 alone or the AlEt 3 ‐H 2 O system as catalyst were found to be composed of two types, that is polyethylene oxide and alternate copolymer of phenyl isocyanate with ethylene oxi…
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…