Materials Literature
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Chains of (TiO6) octahedra occur in several crystal structures as fundamental building blocks, confirming the tendency of self-polymerization for (TiO6) octahedra. There are two topologically distinct types of chains based on linkage of (TiO6) octahedra, corner-sharing chains and edge-sharing chains. In this paper, we…
Optical phenomena accompanying the preflashover along a planar metal-alumina-metal structure were investigated under stepped AC voltage in vacuum. Two kinds of electrode contacts with and without sputtered gold films were employed. For sputtered alumina, the luminescence became observable at /spl sim/1 kV/sub peak/, a…
The magnetic and transport properties of the compound La0.7Sr0.3Mn1-xFe xO 3 (0.1 < x <0.4) have been studied by means of electrical resistivity, AC magnetic susceptibility, and DC magnetization. At low concentrations (x <0.1), the system displays essentially para-to-ferromagnetic transitions as the temperature is dec…
Leitfähige Hybride: Der hier beschriebene Weg zu molekularen Metallen, die sperrige und hoch geladene Polyoxometallate enthalten, beruht auf der Kombination des Donors Bis(ethylendioxo)tetrathiafulvalen (BEDO-TTF) (siehe Bild, Kugel-Stab-Modell) mit anorganischen Schichten aus Keggin-Polyoxometallaten (Polyederdarstel…
Abstract Epoxy resin‐layered silicate nanocomposites (ER‐LSN) were successfully synthesized using pre‐intercalated novolac resin‐layered silicate nanocomposites (NR‐LSN) as epoxy hardeners to develop novel formulations for copper‐clad laminate sheets (CCLS) with enhanced properties. We used melt, melt‐ultrasonic, solu…
Abstract A novel approach to prepare a polyimide nanofoam was explored by using a polyimide precursor grafted with a labile poly(propylene glycol) (PPG) oligomer. The PPG‐grafted polyimide precursor, poly((amic acid)‐ co ‐(amic ester)), was synthesized via partial esterification of poly(amic acid) derived from pyromel…
Corrosion is a plight that faces everyone who works with metals. Its impact on the U.S. economy has been documented to be about 4% of the gross national product. It was estimated that about one third of the corrosion damage could be avoided. The avoidable costs were related to the failure to use the best practices ava…
Abstract While zinc is a crucial element in the formulation of many PVC stabilizers, high levels negatively affect heat and shear stabilities of PVC formulations. Thus, the use of zinc‐containing biocides in PVC has been limited to plastisol formulations, which are not subjected to the heat and shear histories of cale…
Novel antenna edge microwave plasma CVD (AE‐MPCVD) is used for the first time to grow CNFs (carbon nanofibers). The synthesis of CNFs on large‐area substrates with high growth reproducibility is reported at low microwave power input and with remote deposition. A growth area ten times as large as the plasma size genera…
This paper describes a study carried out to evaluate solar absorptance and infrared emissivity degradation of many different thermal control materials (white paints, second-surface mirrors and aluminized films) exposed to geostationnary orbit. For this purpose, a long-term test of about 3 months in constant vacuum was…
Abstract A comparison of the ethylene polymerization performance conducted with an oxo and a triphenylsilyl chromate catalyst on silica was performed. The oxo catalyst has higher activity and better comonomer response. The silylchromate catalyst has a much longer induction time and made a much broader molecular weight…
A numerical model of displacement for a giant magnetostrictive actuator was founded. According to the model and the measured magnetic characteristic of giant magnetostrictive material, the relation between input current and output displacement for the actuator was calculated by means of the finite element method. A co…
In high temperature superconducting (HTS) transformer with double pancake windings, the perpendicular component of leakage magnetic flux density (B/sub r/) applied to HTS tapes of double pancake windings is larger than that of solenoid windings, which acts as a cause to decrease the critical current in HTS tape and in…
Phenylalanine hydroxylase (PAH) is generally considered to undergo a large and reversible conformational transition upon l-Phe binding, which is closely linked to the substrate-induced catalytic activation of this hysteretic enzyme. Recently, several crystallographically solvent-exposed hinge-bending regions including…
Synthetic and semi-synthetic polymeric materials were originally developed for their durability and resistance to all forms of degradation, including biodegradation. Nanotechnology has the potential to revolutionize many sectors, including pharmaceuticals, information technology, medical devices, materials science, ch…
Abstract This paper is in four parts. The first is related to general considerations and experimental analyses, and each of the others is related to different approaches to the theoretical analyses of the mechanical behaviour of weft-knitted fabrics and weft-knitted reinforced composites made of glass fibre. The objec…
This part of the series deals with the measurement of fiber damage caused by needle punching. A critical step in the experimental determination of fiber damage is to unravel fibers from needled nonwoven fabrics. This is achieved by using a feed web containing water-soluble fibers and a small percentage of wool. After…
The effect of pentagonal defects on the electronic structure at the tip of carbon nanohorns is investigated within the continuum gauge field-theory model. It is found that the existence of a localized electron state at the Fermi level (a true zero-mode state) results in enhanced charge density near the tip. Using a se…
The purpose of this study was to evaluate the thermal endurance of two types of thermal control foils. This is an important parameter for selecting materials for inner solar system missions. Assessing the thermal endurance by isothermal testing in a thermogravimetric analyser (TGA) is a time-consuming method. A quicke…
A multiple-interference model to describe double-grating waveguide structures is presented. It is based on the multiple-interference model for single-grating waveguide structures previously established by Friesem and co-workers [J. Opt. Soc. Am. A 14, 2985 (1997)]. We show that double grating waveguide structures, in…