Materials Literature
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A Gaussian size distribution of independently relaxing domains is used to model the response of various glass-forming liquids. With a single temperature-dependent parameter, the model accurately characterizes the observed dielectric susceptibility of salol and glycerol [P. K. Dixon et al., Phys. Rev. Lett. 65, 1108 (1…
Abstract The aim of this study was to investigate the effect of phagocytosed poly( L ‐lactic acid) particles on the morpholgy and viability of phagocytes, mainly macrophages. Therefore, predegraded poly( L ‐lactic acid) (P‐PLLA) and nontreated PLLA (N‐PLLA) particles, both having diameters not exceeding 38 μm, were in…
Electrochemical models of failure in oxide perovskite materials are reviewed. It is noted that oxygen vacancies are a common source of electrical degradation, fatigue, and ageing. Taking the behavior of oxygen vacancies into account, a semi-quantitative model for time dependent dielectric breakdown (TDDB) is proposed…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural aspects of the ambient-pressure BEDT-TTF superconductorsHideki Yamochi, Tokutaro Komatsu, Nozomu Matsukawa, Gunzi Saito, Takehiko Mori, Masami Kusunoki, and Kenichi SakaguchiCite this: J. Am. Chem. Soc. 1993, 115, 24, 11319–11327Publication Date (Print):December 1…
PURPOSE: To test an expandable nitinol intraluminal stent for hoop strength, biocompatibility, corrosion resistance, and patency. MATERIALS AND METHODS: Forty-four stents were implanted in the iliac arteries of 22 sheep. Follow-up was performed with angiography and histologic examination for up to 6 months. RESULTS: A…
The structure of the hexadecameric ribulose-bisphosphate carboxylase/oxygenase from Synechococcus PCC6301 has been solved to 2.2-A resolution. Crystallization was in the presence of CO2, Mg2+, and 2'-carboxyarabinitol bisphosphate to form a stable enzyme quaternary complex that mimics one of the intermediate states of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDicopper(I) trefoil knots and related unknotted molecular systems: influence of ring size and structural factors on their synthesis and electrochemical and excited-state propertiesChristiane O. Dietrich-Buchecker, Jean Francois Nierengarten, Jean Pierre Sauvage, Nicola Armar…
We work out a theory of low-energy Raman scattering in glasses. The scattering and the energy transfer are due to interaction of the light with the soft potentials in glasses. We exploit relations between the scattering cross sections at a certain energy transfer, \ensuremath{\Elzxh}\ensuremath{\omega}, and the mean f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase behavior of poly(ethylene oxide)-poly(propylene oxide) block copolymers in aqueous solutionPer LinseCite this: J. Phys. Chem. 1993, 97, 51, 13896–13902Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 December 19…
A computational method is applied for the analysis of optical absorption spectra of amorphous materials to obtain both the power index, r, and E opt, the optical band gap, from the theories of Tauc, and Davis and Mott which relate the energy of the incident photon (hw) to the absorption coefficient α(w) i.e. [αhw ∼ (h…
The short- and medium-range orders of ${\mathrm{GeSe}}_{2}$ chalcogenide glass were studied by using the radial distribution function. The effect of the annealing temperature on the short-range order structure of this glass was investigated. The short-range order structure of as-prepared and annealed ${\mathrm{GeSe}}_…
Abstract A tetrafunctional epoxy resin and a thermosetting bismaleimide resin were modified by adding a thermoplastic polyether imide, commercially available as Ultem 1000. Dynamic‐mechanical data and electron microscopy analyses demonstrated that a two‐phase system was obtained in both the cases after the curing and…
An intensity enhancement obtained from asymmetric diffraction with a fixed incident angle α has been studied. Parallel-beam synchrotron radiation with λ = 1.54 Å (Stanford Synchrotron Radiation Laboratory) and λ = 1.53 Å (Photon Factory) was used to collect powder diffraction patterns of Si, CeO 2 ( α = 5 and 10°) and…
The local structure of ${\mathrm{As}}_{\mathit{x}}$${\mathrm{Te}}_{100\mathrm{\ensuremath{-}}\mathit{x}}$ glassy semiconductors has been studied using x-ray anomalous scattering and x-ray-absorption spectroscopy as a function of the composition. Two important findings are (a) tellurium (Te) atoms are twofold coordinat…
A hysteresis is observed in the triple helix-coil transition of type III collagen. This hysteresis appears in the thermal transition, where it is not solvent-dependent, and also in the transition induced by guanidinium hydrochloride. The transitions are observed both by optical rotatory dispersion and by trypsin diges…
The purpose of the method described in this paper is to identify with precision sharp phenomena and to produce reliable solutions for various kinds of one-dimensional grating problems in the resonance domain, without limitation in the geometry or the electromagnetic parameters. The theory lies in the use of finite ele…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and magnetic properties of diaqua(L-aspartato)copper(II)R. Calvo, C. A. Steren, O. E. Piro, T. Rojo, F. J. Zuniga, and E. E. CastellanoCite this: Inorg. Chem. 1993, 32, 26, 6016–6022Publication Date (Print):December 1, 1993Publication History Published onli…
Hydration reactions of C 3 A and C 4 AF with calcium sulfate hemihydrate and gypsum were investigated and the kinetics of the reactions compared. The rates of C 3 A and C 4 AF hydration, as determined by heat evolution, vary depending on whether the sulfate‐containing reactant is gypsum or calcium sulfate hemihydrate.…
Cobalt phthalocyanine was synthesized within the cavities of Y zeolites and was characterized in all the steps of the synthesis and purification procedures by elemental analysis, Fourier transform infrared spectroscopy, UV-visible spectroscopy, X-ray photoelectron spectroscopy, surface analysis, thermogravimetric anal…
The AC electromigration lifetime, without DC component, has been studied in a wide frequency range (mHz to 200 MHz) and found to be linearly proportional to the repetition frequency of the AC stressing current. This behavior is observed in both of the metallization systems (Al-2% Si and Cu) investigated. This provides…