Materials Literature
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A simple gedanken experiment is presented to demonstrate the violation of charge (and energy) conservation, as predicted by D.E. Ward (1981), J.J. Paulos and D.A. Antoniadis (1983), and D. Root and B. Hughes (1988), in the two-parameter nonlinear modeling of capacitance. The paradoxes are resolved through examination…
Samples of the spinel series, MnxFe3 –xO4(O ⩽x⩽ 3), have been synthesized by the hydroxide coprecipitation technique and characterised by chemical analysis; XRD and SEM techniques, and measurements of their BET specific surface areas, saturation magnetisations and electrical resistivities. The specimens with values of…
Abstract
The design of anti-friction coatings able to perform well in different wear conditions without lubricants requires a combination of adequate hardness and toughness, good adhesion, a low friction coefficient and a low wear rate. Recently introduced metal-diamond-like carbon (DLC) coatings can be a major step towards th…
Complexes formed between 4-alkoxystilbazoles and 3-cyanophenol show liquid crystal mesophases. Compared to the mesomorphism of similar complexes formed between stilbazoles and 4-cyanophenol, the mesophases are more stable and are enantiotropic.
A 120 kW coaxial winding transformer has been built and tested to verify previous indications that a high power transformer is feasible with the key attributes of this novel design, namely: low leakage inductance, minimal effect of leakage field on core losses, low copper losses, and a convenient "nesting" structure w…
Using picosecond time-domain reflectometry, dielectric relaxation studies have been carried out for p-fluorophenylacetonitrile(FPA)–methanol(MeOH) mixtures over the frequency range 10 MHz–10 GHz at various temperatures. The relaxation in these systems can be described by a single relaxation time using the Debye model.…
Vincristine is a potent therapeutic agent with activity against a variety of tumor types. It is a cell-cycle specific agent which has exhibited enhanced anti-tumor activity when delivered in liposomal form. Vincristine can be encapsulated into large unilamellar vesicles in response to a transmembrane pH gradient with…
UV irradiation of the gas/solid interface of microcrystalline TiO2 in the presence of water and carbon dioxide in the gas phase at 343 K leads to photoreduction of carbon dioxide to form carbon monoxide, hydrogen and methane.
Various amounts of vanadium pentoxide (V/sub 2/O/sub 5/) were introduced to the NiCuZn ferrite to reduce the sintering temperature. The V/sup +5/ cations entered the crystal lattice of the ferrite and improved the initial permeability and quality factor, 0.5 mol% of V/sub 2/O/sub 5/ was required to form the liquid pha…
Reaction of octakis(dimethylamino) porphyrazine 1 with [60]fullerene gives a crystalline 2:1 charge-transfer (CT) complex as a three-dimensional network of chains; in contrast, reaction of 1 with tetracyanoquinodimethane (TCNQ) gives a crystalline 1:1 charge transfer salt as one-dimensional integrated stacks.
The crystal structure of orthorhombic HfO 2 synthesized at 600°C and 6 GPa was investigated by a time‐of‐flight neutron powder diffraction experiment. Rietveld analysis of these data revealed that the space group of this phase is Pbca. The refined lattice parameters are a 0 = 1.00177, b 0 = 0.52276, and c 0 = 0.50599…
It is very important for a spinner to be able to predict the degree of spinnability of a given fibre quality. Certain process conditions must be taken into account here. This paper describes how the spinnability or a given fibre quality on a rotor and ring spinning machine can be predicted with a reliability of 95% by…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBond Strength Trends in Halogenated Methanols: Evidence for Negative Hyperconjugation?William F. Schneider, Barbara I. Nance, and Timothy J. WallingtonCite this: J. Am. Chem. Soc. 1995, 117, 1, 478–485Publication Date (Print):January 1, 1995Publication History Published onli…
Thermodynamic parameters of melting for mono- and di-substituted benzenes and naphthalenes have been examined. Correlations with molecular structural parameters are discussed. With very few exceptions, ortho- and meta-disubstituted benzenes melt at lower temperatures than para-isomers, an enthalpic effect related to c…
With the introduction of artificial implant devices, a new host of biomembrane-like structures have been introduced into the bio-media made up of the synthetic matrix, adsorbed proteins and lipids. Lysosomal hydrolases, e.g. cholesterol esterase (CE), are implicated during the tissue response near the tissue-implant i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrothermal Synthesis of (Ph4P)2[Hg2As4S9] and (Me4N)[HgAs3S6]. Extended Chains and Layers Based on the Condensation of [AsS3]3- UnitsJun-Hong Chou and Mercouri G. KanatzidisCite this: Chem. Mater. 1995, 7, 1, 5–8Publication Date (Print):January 1, 1995Publication History P…
The application of Preisach modelling to the study of the microstructure-hysteresis interplay in soft magnetic materials is reviewed. It is shown that mean-field effects are mainly due to the change of the total domain wall surface energy along the hysteresis loop. The reconstruction of the Preisach distribution from…
The pyrolytic evolution of poly(N‐methylsilazane), –[H 2 SiN‐Me] x –, from preceramic polymer to ceramic product is followed by heating samples of the partially cross‐linked polymer, in 200°C increments, from ambient temperature to 1400°C. The intermediate products are characterized by chemical analysis, diffuse refle…
The refractive indices, optical anisotropies, polarisabilities and order parameters of a number of phenylthiophenes and the parent dithienyl and biphenyl compounds with butylsulfanyl and cyano substituents have been measured. The presence of a thiophene ring leads to: (i) increased values of n∥ and n⊥ with the latter…