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。
We present a model of insulating glasses in which defects interact strongly via the elastic strain field. The interactions are oscillatory at short range and cross over to 1/${r}^{3}$ interactions at longer length scales. This crossover is marked by a strong renormalization of the density of states and is consistent w…
The electrical conductivity of diamond thin films produced by the hot-filament technique is found to increase when diborane is incorporated in the precursor gas mixture. The combination of well-defined bulk conductivity measurements with quantitative secondary-ion mass spectrometry and Raman spectroscopy shows that th…
Band-structure calculations of ferromagnetic Fe 1/3 TaS 2 and Mn 1/3 TaS 2 using the augmented spherical-wave method are reported. The calculations give a spin magnetic moment of 4.35 mu B per Fe for Fe 1/3 TaS 2 and 4.18 mu B per Mn for Mn 1/3 TaS 2 . The local moments at Fe and Mn induce a magnetic polarisation of t…
We study surface and bulk equilibrium in Si-Ge alloys by direct simulation. The composition at a reconstructed (100) surface varies with depth in a complex oscillatory way. Lateral ordering occurs even in the fourth layer, driven by the local stress field. The bulk phase diagram is well described by regular solution t…
The gases that are emitted when an encapsulant resin is exposed to a high-temperature were analyzed by GC-MS. The effect of these gases on IC devices were studied using a Teflon vessel. The result showed that large amounts of bromides and organic acids are emitted from the encapsulant resin and that these gases are ge…
Abstract Mechanical blends of copolymer‐type polyacetal (POM) with ester‐based and ether‐based polyurethane (PU) are immiscible over the 0–50% PU compositional range. The PU elastomer was added to the rigid POM matrix to increase its toughness. The mechanical, physical, thermal, dielectric, and dynamic mechanical prop…
Abstract Homogeneous periodate oxidation of cellulose was achieved through methylol cellulose. The dissolution of methylol cellulose into aqueous periodate solution was followed by the gradual decomposition of methylol groups at random sites along the methylol cellulose chain. The recovery of glycol hydroxyl groups at…
``Complete'' valence photoelectron spectra of neon and argon have been measured at several photon energies between 50 and 150 eV. Besides a symmetric shake-off energy spectrum as anticipated theoretically many unexpected electron lines with fixed kinetic energy were observed, particularly in the low-energy part of the…
Crystal optical and X-ray diffraction studies show that the high-temperature phase I of the perovskite-type layer-compounds (C n H 2n+1 NH 3 ) 2 CuCl 4 with n=1, 2, 3 is Jahn-Teller distorted orthorhombic with space group Bbcm (D 2h 18 ). As a consequence, the order of the C n H 2n+1 NH 3 group leads to two configurat…
Structural phase transitions in amorphous solids associated with vanishing bulk modulus K or shear modulus \ensuremath{\mu} are considered. We find that the transition (realized in gels) at K=0, though of second order, does not exhibit true scaling behavior of density fluctuations. An isotropic state with vanishing \e…
We present a molecular-dynamics study of a system of end-grafted polymers between parallel surfaces. We find that the forces between the surfaces as a function of their separation can be described both by scaling and self-consistent field theories and agree with the experiments of Taunton et al. We quantify the amount…
In the framework of the Organization for Economic Cooperation and Development/Committee on the Safety of Nuclear Installations Task Group on Three Mile Island Unit 2 (TMI-2), the Commissariat ??? I’Energie Atomique examined five samples retrieved from the damaged reactor core: a slightly damaged fuel rod chunk from as…
Detailed microstructural and microchemical examinations of samples of debris extracted from the lower plenum region of the Three Mile Island Unit 2 reactor were performed using optical and electron-beam instrument microscopy. Results of this study indicate that this material was a previously molten ceramic consisting…
Core debris samples obtained from different regions of the Three Mile Island Unit 2 (TMI-2) core were examined to characterize the interaction among core components and the coolant, to determine the peak temperatures at which the interactions occurred, and to evaluate core melt progression in TMI-2. Estimates of peak…
Chemical interactions that may occur in a light water reactor fuel rod bundle containing Ag-In-Cd absorber rods or Al203/B4C burnable poison rods with increasing temperature up to the complete melting of the components and the reaction products formed are described. The kinetics of the most important chemical interact…
Three samples from the ceramic melt, the lower crust, and the lower plenum of the previously molten part of the Three Mile Island Unit 2 core have been analyzed by X-ray diffraction to determine the compounds formed as a result of the accident in 1979. Supporting analyses were performed by gamma spectroscopy and parti…
Samples of the bores obtained from the melted core of the Three Mile Island Unit 2 (TMI-2) reactor were investigated as part of the TMI-2 accident evaluation program. The samples included fuel rod segments, control rod cladding, melted core rocks, and powder debris from various bores into the reactor core.The microstr…
The primary objective of the U.S. Department of Energy Three Mile Island Unit 2 (TMI-2) research program, conducted by the EG&G Idaho TMI-2 Accident Evaluation Program, is to develop a comprehensive and consistent understanding of the TMI-2 accident. The accident scenario developed from this research is presented, inc…
Abstract Stabilization of ZnO photoanodes was investigated using ZnO thin film electrodes under controlled potential in various pH solutions; the effects of light intensity and agitation were also studied. The photocorrosion of ZnO photoanodes was suppressed at sufficiently cathodic potentials and/or at low light inte…
The obtaining of the representative matrices of the I icosahedral rotation group by means of the descent symmetry from the K group of rotations of the sphere.