Materials Literature
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The interaction of sound waves with tunneling, relaxational, and resonant vibrational states in glasses is investigated within the soft-potential model. The same bilinear coupling constant is assumed for all three different kinds of soft modes. The model reproduces the results of the tunneling model at low temperature…
The ITS system is a powerful and user-friendly software package permitting state-of-the-art Monte Carlo solution of linear time-independent coupled electron/photon radiation transport problems, with or without the presence of macroscopic electric and magnetic fields of arbitrary spatial dependence. Version 3.0 is a ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTArylsilsesquioxane gels and related materials. New hybrids of organic and inorganic networksK. J. Shea, D. A. Loy, and O. WebsterCite this: J. Am. Chem. Soc. 1992, 114, 17, 6700–6710Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Publishe…
The Judd-Ofelt intensity parameters, ${\mathrm{\ensuremath{\Omega}}}_{\mathit{t}}$ (t=2,4,6) for f-f transitions of ${\mathrm{Er}}^{3+}$ ions doped in ${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$-${\mathit{R}}_{2}$O (R=Na,K) glasses were determined from optical-absorption measurements, and their compositional dependence was i…
Previous work demonstrated that human furin is a predominantly Golgi membrane-localized endoprotease that can efficiently process precursor proteins at paired basic residues (-Lys-Arg- or -Arg-Arg-) in transfected cells. Anion-exchange chromatography of culture supernatant from cells expressing a soluble truncated for…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign of metal-complex magnets. Syntheses and magnetic properties of mixed-metal assemblies {NBu4[MCr(ox)3]}x (NBu4+ = tetra(n-butyl)ammonium ion; ox2- = oxalate ion; M = Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+)Hiroko Tamaki, Zhuang J. Zhong, Naohide Matsumoto, Sigeo Kida, Masay…
An overview is given of theory and experiments on liquid crystal phases which appear in solutions of elongated colloidal particles or stiff polymers. The Onsager (1949) virial theory for the isotropic-nematic transition of thin rodlike particles is treated comprehensively along with extensions to polydisperse solution…
This paper presents an overview of duplex stainless steels (DSS) with particular emphasis on super DSS, i.e. steels containing sufficient amounts of chromium, molybdenum, and nitrogen to produce a pitting resistance equivalent greater than 40. Duplex stainless steels have an attractive combination of mechanical and co…
In a comprehensive study, the modified embedded-atom method is extended to a variety of cubic materials and impurities. In this extension, all functions are analytic and computationally simple. The basic equations of the method are developed and applied to 26 elements: ten fcc, ten bcc, three diamond cubic, and three…
The purpose of our study was to compare the therapeutic effects of doxorubicin in 3 different formulations: (1) in PBS, (2) in conventional liposomes composed of egg phosphatidylglycerol/egg phosphatidylcholine/cholesterol/dl-alpha tocopherol, and (3) in sterically stabilized, long-circulating "Stealth" liposomes comp…
Conventional evaporation as well as IAD and IBS processes were used to develop low-loss dielectric mirrors and antireflection coatings for the wavelength range 130 to 250 nm. First, single layers of SiO<SUB>2</SUB>, Al<SUB>2</SUB>O<SUB>3</SUB>, HfO<SUB>2</SUB>, AlF<SUB>3</SUB>, MgF<SUB>2</SUB>, LaF<SUB>3</SUB>, NdF<SU…
Abstract The morphology of the molluscan shell microstructure cross-lamellar structure (XLM) was studied by a scanning electron microscopy (SEM) examination of a variety of species (Patella vulgata, Littorina littorea, L. nigrolineata, L. obtusata, L. saxatilis, Oliva sayana, Conus litteratus, C. magus, Pomatias elega…
The anomalous X-ray scattering (AXS) method using Zn and Fe K-absorption edges has been applied to a structural study of amorphous zinc-ferrite film (1.4 mu m in thickness) grown on a silicate glass substrate. The possible atomic arrangements in near-neighbour regions of amorphous zinc-ferrite films were estimated by…
A few possible structural models of n-diamond, which is a modified form of diamond quenched from shock-compressed graphite, are proposed on the basis of observed electron diffraction patterns. From the structural relationship and transition mechanism, the most favored structure is composed of hexagonal-ring-planes mod…
The modulus and phase of the complex third-order nonlinear optical (NLO) susceptibility \ensuremath{\chi}${\mathrm{\ifmmode \tilde{}\else \~{}\fi{}}}^{(3)}$(-3\ensuremath{\omega};\ensuremath{\omega},\ensuremath{\omega},\ensuremath{\omega}) have been measured on an all-trans silicon polymer, poly(dihexylsilane), over a…
Electrical resistivities of heavily doped polyacetylene and polypyrrole exhibit a wide range of temperature variation as a function of the degree of disorder. Thermal activation behavior is found for the strongly disordered state, while a weak temperature dependence down to the mK region is found for the weakly disord…
Spinodal decomposition in thin films of a blend of deuterated polystyrene and poly(styrene-co-4-bromostyrene) was studied with time-of-flight--elastic-recoil detection and light microscopy. We found different demixing behavior, depending on whether the films were prepared on the oxide layer of a silicon wafer or on a…
Small angle neutron scattering experiments were carried out on a charged stabilized dense colloidal suspension to observe changes in lattice structure as a function of shear rate. It is shown that (1) the lattice will evolve from a crystalline state in equilibrium to a polycrystalline state if subjected to a very low…
A highly sensitive photodetector was made with a metal-porous silicon junction. The spectral response was measured for the wavelength range from 400 nm to 1.075 μm. It was demonstrated that close to unity quantum efficiency could be obtained in the wavelength range of 630–900 nm without any antireflective coating. The…
Abstract Hydroxypropyl cellulose films were cast from liquid crystalline solutions with a crosslinking agent. The solubility test and the optical measurements of the resultant films were performed. The tensile, dynamic mechanical, and creep properties of the films were determined. The data of solubility in water deter…