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。
[111] ordered common atom strained layer superlattices (in particular the common anion GaSb/InSb system and the common cation InAs/InSb system) are investigated using the ab initio full potential linearized augmented plane wave (FLAPW) method. We have focused our attention on the potential line-up at the two sides of…
Using density-functional theory with the local-density approximation and the generalized gradient approximation we compute the energy barriers for surface diffusion for Ag on Pt(111), Ag on one monolayer of Ag on Pt(111), and Ag on Ag(111). The diffusion barrier for Ag on Ag(111) is found to increase linearly with inc…
We briefly introduce tweed, which is found above the martensitic transition in a variety of shape-memory, high-T_c, and other materials. Based on our previous mapping of the problem onto a spin-glass model, we conjecture that the two-way shape-memory effect is due to tweed.
The effects of electron-hole interaction on the exciton energy of semiconductor quantum dots are calculated using pseudopotential wave functions. A comparison with the widely used, but never tested, effective-mass approximation (EMA) shows that the electron-hole Coulomb energy is significantly ( $\ensuremath{\sim}40%$…
The perpendicular arrangement of porphyrin units in dimer 1 is reflected in a large excitonic coupling that leads to splitting of the Soret bands and only modest spectral changes in the Q-bands. Compound 1 and the analogous trimer and tetramer are prepared by oxidative coupling of the corresponding 5,15-diarylporphyri…
The influence of single and simultaneous substitution with Zn and Al on magnetic ordering in nickel ferrites has been investigated by the statistics of superexchange interactions developed by Gilleo. The additional magnetic weakening due to the magnetic ions excluded from participation in ferrimagnetism has been inclu…
The metastable ferromagnetic τ-phase of the Mn–Al–C system has been studied by neutron diffraction to determine the lattice sites occupied by carbon atoms. The data obtained for Mn0.56Al0.44C0.018 and Mn0.56Al0.44C0.024 samples show that the carbon sublattice is ordered and carbon atoms occupy interstitial sites (1/2,…
Abstract Macromolecular aggregation during thermoreversible gelation in solutions of the helical polypeptide poly(γ‐benzyl‐L‐glutamate) [PBLG] in benzyl alcohol [BA] were studied by small angle neutron and small angle X‐ray scattering. Gelation is apparent as a large increase in the intensity scattered at low angles,…
Electromigration threshold, the product of current density, j, and the threshold length, lth, was measured for unencapsulated thin-film Cu conductors using edge-displacement techniques. jlth was measured between 175 and 275 °C, and was found to be temperature dependent above 200 °C where jlth decreased with increasing…
This paper describes the modeling of a simple, nonconventional approach to rapid thermal processing for semiconductor applications. The principle underlying the technology is the use of gas conduction in the molecular regime to transfer heat from a hot chuck to the wafer. We demonstrate here that rapid and intrinsical…
Temperature-dependent centimeter-wave reflection is studied in powdered samples of potassium nitrate (KNO3), potassium nitrite (KNO2), sodium nitrate (NaNO3), and sodium nitrite (NaNO2). Temperature-dependent reflection measurements at centimeter-wave frequencies were performed on an HP8510B Network analyzer based ref…
There is a need for an analytical assessment of the properties of 3D woven structures. In this paper a sophisticated method of predicting the proportions of fibre in three mutually perpendicular axes, X (warp), Y (weft) and Z (through-the-thickness), of 3D fully integrated complex woven structures is described. Unlike…
Abstract Inhibition of the corrosion of mild steel in H 2 SO 4 by amino acids was studied by measuring the Tafel polarization curves. Nineteen different naturally occuring amino acids were used as corrosion inhibitors. Two‐site adsorption model was proposed to explain the adsorption of some amino acids on the metal su…
In situ composites were prepared via melt blending of a liquid crystalline polymer (LCP) and polycarbonate using a twin screw extruder. The structure and morphology of these composites were analysed using both transmission electron microscopy (TEM) and scanning electron microscopy. The LCP phases were able to orientat…
Abstract Divalent tin has been intercalated into montmorillonite by reacting partially hydrolyzed solutions of SnCl 2 under aerobic conditions at pH = 2.8 with aqueous dispersions of the smectite mineral. The precursor tin solution contains mainly the cationic trimeric ion Sn 3 (OH) 4 2+ , which is shown to take part…
Data on the thermal conductivity ϰ ph of the cluster lattice of synthetic opals are analyzed. All opals are divided into two groups according to the temperature dependence of their ϰ ph . These are opals-1, whose thermal conductivity behaves like ϰ ph ( T ) of quasi-crystalline materials, and opals-2, with a ϰ ph ( T…
Mechanical properties of experimental nitrogen alloyed powder metallurgically produced duplex stainless steels were investigated. The microstructure of the studied powder metallurgically (PM) fabricated and hot isostatically pressed (hipped) duplex stainless steels was homogeneous and isotropic. The proportions of aus…
Sol-gel derived PZT thin films were spincoated on Corning 7059 glass substrates and fired to temperatures ranging from 500C to 600C for 30 min. The PZT compositions consisted of PZT x/y where x/y = 0/100, 20/80, 35/65, 53/47, 65/35, 80/20 and 100/0. Only single coated films were used since multiple coatings led to hig…
Severe fuel damage experiments simulating small-break loss-of-coolant accidents have been carried out in the CORA out-of-pile test facility at Forschungszentrum Karlsruhe. Rod bundles with electrically heated fuel rod simulators containing annular UO2 pellets, UO2 full pellet rods, and absorber rods of two kinds (Ag/I…
Eight kinds of knitted fabrics, made from wool, polyester, cotton, acrylic, porous acrylic, polypropylene, viscose and polyester/cotton blend, were studied by both objective laboratory measurements and subjective wearer trials. The transport properties of the fabrics: thermal resistance, water vapor permeability, air…