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。
A photoinduced magnetic moment has been observed in Cu and Al samples exposed to unpolarized visible light at low temperatures. It is shown that the light refected from a metal surface transfers some of its quasimomentum to conduction electrons. This mechanism creates surface currents which, for an appropriate geometr…
We discuss the implications of the classical Gauss-Bonnet formula to foam in two and three dimensions. For a two-dimensional foam it gives a generalization of the von Neumann law for the coarsening of foams to curved surfaces. As a consequence of this we find that the stability properties of stationary bubbles of such…
Reduction of S2O82− ions at the interface between an n-type porous Si electrode and an aqueous solution gives rise to electroluminescence showing evidence of quantization effects. A broad emission band with a maximum at 670 nm is observed similar to the photoluminescence spectrum of the same layers. The results sugges…
We examined the change in photoluminescence spectra of porous Si when it is oxidized then deoxidized chemically. After both steps, photoluminescence shifted to higher frequencies and increased in intensity. These shifts to higher frequencies indicate the photoluminescence is a result of the quantum size effect. Moreov…
The kinetics of the correlated annealing of pairs of neutral (F-H) and charged ( alpha -I) Frenkel defects in alkali halides is treated theoretically, taking into account defect diffusion, annihilation at short distances, and elastic or Coulomb interactions. It is shown that elastic interactions considerably affect th…
Magnetostriction temperature dependencies in Tb0.3Dy0.7 (Fe1−xMnx)2 were investigated. Mn substitution lowers the spin reorientation temperature, at which magnetostriction shows a sharp drop. Moreover, Mn containing compounds show larger magnetostriction than that for a Mn-free compound at low temperature. Mössbauer m…
The polycrystalline Sn-doped In2O3 (ITO) films with different Sn concentrations of 0–6.7 wt% (SnO2 wt%) were prepared by postannealing the amorphous ITO films deposited by highly dense plasma-assisted EB evaporation at the low substrate temperature. These films were confirmed to show the high crystallinity and homogen…
We have used the magneto-oscillatory behavior of the quasi-two-dimensional orbits in the charge-transfer organic salt (BEDT-TTF${)}_{2}$KHg(SCN${)}_{4}$ to probe its underlying magnetic ground states, which arise from the coexisting quasi-one-dimensional nature of the material. The complex nature of the oscillations r…
Brushes of grafted polystyrene have been studied using the classical small-angle neutron scattering techniques. The results show unambigously that the interface, in good solvent, has essentially a parabolic shape, with a small exponential tail. Furthermore, the local structure is similar to that of a semidulute polyme…
Abstract Bombyx mori silk fibers were chemically modified by acylation with aromatic acid anhydrides, such as phthalic and o ‐sulfobenzoic anhydrides. We examined the reactivity of these modifying agents toward silk fibers, the physical and thermal properties, and the dyeing behavior with acid and cationic dyes. The o…
Abstract The effect of quiescent annealing for brief periods at melt‐processing temperatures (e.g., 270°C) were designed to simulate certain conditions that can occur during molding or extrusion. It was found that significant changes in the phase morphology of polycarbonate‐based blends can occur in less than 2 min un…
Diamond is known as a unique materiaI possessing a number ofoutstanding Properties1) Many laboratories have been active on diamond research since Deaguin e Z2)reported on diamond growth by chemical vapour deposition (CVD)methodDiamond films grown by this method in the presence of boron have p-type semiconducting Prope…
Abstract X‐ray photoelectron spectroscopy (XPS) is used to compare the surface behavior in various binary systems of poly(dimethylsiloxane) with poly(bisphenol A sulfone) and poly(bisphenol A carbonate). All the systems studied show a pronounced surface enrichment in siloxane. At a fixed siloxane concentration in the…
Abstract In this article we studied the potential of ethylene vinyl acetate copolymer (EVA) as an impact modifier for isotactic polypropylene (PP). PP/EVA blend in the range 0–40 wt % EVA content is studied by using three grades of EVA containing 9, 12, and 19 wt % VA. Izod impact strength measurements were made at te…
Abstract The theory for the calculation of the frequency‐dependent hyperpolarizabilities β(−2ω; 0, ω), β(−ω; 0, ω), and β(0; ω, −ω) is discussed. New relations between these tensors are derived for those wave functions that obey the time‐dependent Hellmann–Feynman theorem (e.g., the self‐consistent field [SCF] or the…
Abstract A simplified three‐level model for γ, the molecular third‐order nonlinear optical susceptibility, is presented and discussed. The perturbation theory‐based approach suggests that there are three primary avenues to optimizing molecular four‐wave mixing susceptibilities and that with each of these is associated…
Abstract Effects of particle size on the mechanical and impact properties of cured epoxy resins are studied. This resin was filled with spherical silica particles prepared by hydrolysis of silicon tetrachloride. Particles were sorted into five kinds of different mean sizes in the range from 6–42 μm. A static flexural…
We report a case of acute renal failure secondary to ingestion of ecstasy (methylenedioxymethamphetamine, MDMA).
Treatment of anodized or chemically etched silicon ("porous silicon") with dilute nitric acid or persulfate solution results in weak chemiluminescence in the visible region. Concentrated nitric acid reacts violently with porous Si produced by anodization with a bright flash of light. The fact that similar reactions oc…
The complex refractive index at 60 GHz of soda-lime glass, which is commonly used as window glass, has been measured by means of a free-space reflection method using a vector-network-analyser-based scatterometer. The complex refractive index was estimated to be 2.61 – 0.0318j, which is consistent with previously-repor…