Materials Literature
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Niobium‐alumina (Nb‐Al2O3) composites have been fabricated via the pressureless sintering of compacts of intensively milled Nb‐Al2O3 mixtures. Strength and fracture toughness of the composites increase as the niobium content increases. For a composite that contains 50 vol% niobium, strengths of up to 680 MPa, with a c…
The nascent morphology of UHMW PE exhibits high melting point, high crystallinity, and increased WAXS line breadth relative to samples formed by melt crystallization. Different empirical relationships between crystal size and melting point are observed for nascent and molded samples. This differentiation is removed fo…
Silica membranes exhibiting excellent molecular sieving capability, which would find applications in fuel-cell electric vehicles with on-board hydrogen generation, for example, are the aim of the sol-gel strategies outlined here. It is shown that optimization of the sol-gel synthesis parameters is important in order t…
The mechanical properties of composites consisting of high density polyethylene (HDPE) and oil palm frond (OPF) have been investigated. Three sizes of OFF at different filler loadings were compounded using a single screw compounder. Modulus of rupture (MOR) of the OPF-HDPE composites decreased with increasing filler l…
An experimental investigation of the dynamics of horizontal soap films stretched over circular or square boundaries undergoing periodic transverse oscillations at frequencies in the range 20–200 Hz is reported. Concomitant with modes of transverse flexural oscillations, it was observed that two-dimensional vortices in…
Nanomorphologies and crystallographic orientations of the brazed interface of silicon nitride (Si 3 N 4 ) were analyzed via high‐resolution transmission electron microscopy. When Si 3 N 4 was brazed using an Ag‐Cu‐Ti alloy, titanium nitride (TiN) nanoparticles were formed adjacent to the ceramic as reaction products,…
Hexadecakis(2,2,2-trifluoroethoxy)-substituted vanadyl and zinc phthalocyanines, and hexadecakis(ethoxy)vanadylphthalocyanine, were synthesized and characterized. Their aggregation properties were studied by evaluation of the concentration dependence of absorption spectra. Hexadecakis(2,2,2-trifluoroethoxy)-substitute…
It is reported that annealing of oxidized porous silicon in water vapor at about 250 °C drastically enhances its blue emission. Infrared absorption studies indicate that this annealing increases all the absorption peaks related to O–H vibrations, except for that of free silanol which disappears completely. No traces o…
The BLANC program suite is a set of programs which can be used for macromolecular structure determination by X-ray crystallography. The suite is designed to provide experienced crystallographers and students with a number of simple tools, at the same time allowing the building and testing of new algorithms. Besides a…
Soluble preparations of [LysB28,ProB29]-human insulin analogue (LysPro) exhibit more rapid absorption than human insulin upon subcutaneous injection. Biphasic mixtures of LysPro and intermediate-acting insulin suspensions could provide advantages over current preparations for the treatment of diabetes. To prepare biph…
A prototype production system for recycling expanded polystyrene (EPS), which uses an orange oil, d-limonene, as the EPS shrinking agent, has been developed. This system consists of an apparatus to dissolve EPS and a recycling plant to separate the limonene solution. The recycling plant can mass reproduce polystyrene…
The stability of aqueous suspensions containing SiC nanoparticles prepared by inductively coupled plasma has been studied. Physicochemical analyses indicated that the as‐prepared samples consisted of monocrystalline spherical particles of the 3C‐SiC polytype with a mean diameter of about 40 nm. HRTEM clearly showed th…
Three simple equations are presented, which describe the variation of protein solubility (S) with changes in salt concentration, in terms of either the salt molality (M), the salt activity (ax), or the water activity (aw). Each equation yields, essentially independent, estimates of the numbers of salt ions (delta vx)…
Adsorption of proteins occurs via diffusion toward the interface, actual adsorption, and subsequent irreversible conformational changes resulting in denaturation of the native protein structure. The conventional kinetic models describing these steps are based on the assumption that the denaturation transitions obey th…
As ferroelectric thin films are investigated as alternative sensors and actuators for microelectromechanical systems, it is becoming important to understand which mechanisms control the magnitude of the observed piezoelectric properties. It is well known that in bulk soft lead zirconate titanate actuators, over half t…
Abstract The boundary between diagenesis and metamorphism most likely involves the change of illite into mica. Observations of this change can be made using decomposed X-ray diffraction (XRD) spectra of illitic clay mineral assemblages in pelitic sedimentary rocks. XRD analysis of the (003) diffraction peak of diagene…
The twisting ability of a novel series of bridged binaphthol derivatives with substituents of various lengths and chemical nature in the 6,6-positions, recently synthesized and used as dopants in nematic solvents, is investigated with the help of the model based upon surface- helicity tensors. Structures of the low en…
The packing of the chains in (T6G2T2G2)n conformation of the form IV of s-PP is revisited on the basis of packing energy and structure factor calculations. According to this analysis, an alternative mode of packing has been suggested. A monoclinic structural model, with the unit cell centered on the C face, is obtaine…
Small angle resonant x-ray scattering measurements were performed for Pb(Mg1/3Nb2/3)O3 (PMN) at the Pb and Nb absorption edges using synchrotron radiation. The results are not consistent with the current model of segregated nano-domains and pose a serious question on the mechanism of the relaxor ferroelectric behavior…
We present the results of a large-scale computer simulation of supercooled silica. We find that at high temperatures the diffusion constants show a non-Arrhenius temperature dependence, whereas at low temperature this dependence is compatible with an Arrhenius law. We demonstrate that at low temperatures the intermedi…