Materials Literature
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Description The ASTM series on Engineering Dielectrics is devoted to a comprehensive presentation of topics related to electrical insulating materials that concern their dielectric properties, their use, and evaluation for application for electrical power and communication apparatus structures and devices. The first v…
A three-parameter description of optical fiber material dispersion is proposed which fits the available data and reveals the key roles played by bond length, lattice structure, chemical valence, average energy gap, and atomic mass. Using broadly applicable trends in electronic and phonon oscillator strengths, simple e…
It is shown that the mechanism of the electronic conduction due to variable-range hopping in the Anderson localized states gives rise to a large negative magnetoresistance, particularly in the vicinity of the metal-nonmetal transition. This result is mainly caused by an exponential dependence of the hopping rate on th…
Abstract A series of radiation‐grafted hydrogels with water contents ranging from 10% to 90% have been prepared. When evaluated by the vena cava ring test, increasing amounts of adherent thrombus were found in rings with lower graft water contents. Using a baboon arteriovenous shunt evaluation system, platelet thrombo…
Abstract The high‐strength, high‐modulus Kevlar 49 fiber is widely used today because of its superior properties. In this paper, we discuss the fundamental physicochemical nature of the commercial fiber. It is an extended chain polymer, poly( p ‐phenylene terephthalamide), which is highly crystalline. Extensive analys…
Even though the average molecular direction in smectic A phases is perpendicular to the smectic planes, most molecules in these phases have rather large tilt angles because the orientational order parameter S in all smectic A phases is significantly less than unity. This molecular tilt inherent to all A phases account…
A three-sublattice analysis of ${M}^{2+}{{\mathrm{Fe}}_{2}}^{3+}{\mathrm{O}}_{4}$ ($M={{\mathrm{Li}}_{0.5}}^{+}{{\mathrm{Fe}}_{0.5}}^{3+}, {\mathrm{Mn}}^{2+}, {\mathrm{Fe}}^{2+}, {\mathrm{Co}}^{2+}, {\mathrm{Ni}}^{2+}, {\mathrm{Cu}}^{2+}$) spinel ferrites based on the molecular-field approximation has been used to obt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRigid Backbone Polymers. 2. Polyisocyanates and Their Liquid-Crystal BehaviorShaul M. AharoniCite this: Macromolecules 1979, 12, 1, 94–103Publication Date (Print):January 1, 1979Publication History Published online1 May 2002Published inissue 1 January 1979https://doi.org/10.…
Abstract The reactive Al pool in selected Ultisols, Oxisols, and Histosols from Africa, South America, and North Carolina was estimated by extraction with 1 N CuCl 2 . The Al‐saturated clay minerals with and without interlayered hydroxy‐Al were used to compare the extractability of Al by 1 N CuCl 2 and 1 N KCl. The 1…
The two structural phase transitions in the perovskite layer structure compound (C10H21NH3)2CdCl4 at Tc1=35 °C and Tc2=39 °C have been studied by x‐ray diffractional, calorimetric and dielectric measurements, proton NMR spin–lattice relaxation and second moment investigations, 35Cl and 14N quadrupole resonance spectro…
I-Materials.- 1 Introduction.- 2 Styrenic Thermoplastic Elastomers.- 3 Thermoplastic Polyolefin Elastomers.- 4 Elastomeric Alloy Thermoplastic Vulcanizates.- 5 Single Phase Melt Processible Rubber.- 6 Copolyester Thermoplastic Elastomers.- 7 Thermoplastic Polyurethane Elastomers.- 8 Polyamide Thermoplastic Elastomers.…
OBJECTIVE: We introduce an RGD (Arg-Gly-Asp)-containing peptide of collagen IV origin that possesses potent cell adhesion and proliferation properties. MATERIALS AND METHODS: In this experimental study, the peptide was immobilized on an electrospun nanofibrous polycaprolactone/gelatin (PCL/Gel) hybrid scaffold by a ch…
The strength characteristics of annealed brittle surfaces impacted with sharp particles were studied. A theory of the degradation process is constructed in three steps: (1) A sharp particle delivers an impulsive load to the target surface via a plastic contact; (2) the contact loading initiates and propagates median c…
A system of rigid, inpenetrable, rodlike molecules subject to orientation-dependent mutual attractions is treated by extension of the theory presented in the preceding paper. This energy is formulated, for a system at constant volume, by considering interactions between pairs of segments in contact, rather than in ter…
The microscopic structure of the ${\mathrm{Fe}}^{3+}$-${V}_{\mathrm{O}}$ and ${\mathrm{Mn}}^{2+}$-${V}_{\mathrm{O}}$ pair centers has been considered using the Newman superposition model. This model yields the EPR parameter ${b}_{2}^{0}$ as a function of transition-metal-ion-oxygen distance $d$ and position. It is fou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVanadium-catalyzed epoxidation of cyclic allylic alcohols. Stereoselectivity and stereocontrol mechanismTakashi Itoh, Koichiro Jitsukawa, Kiyotomi Kaneda, and Shiichiro TeranishiCite this: J. Am. Chem. Soc. 1979, 101, 1, 159–169Publication Date (Print):January 1, 1979Publica…
First published in 1979, this is a self-contained account of the theory of surface physics. In drawing together many results only previously reported in research papers, the authors emphasise basic disciplines such as electrodynamics and electron gas theory and demonstrate their application to simple models. Connectio…
Description Those in the fields of corrosion engineering and metallurgy will find that this publication offers and introduction for those unfamiliar to the slow strain-rate technique (SSRT) for stress corrosion cracking (SCC) in metals and relevant information the application of the technique for specific alloys of ch…
Biofilms can develop on almost any surface exposed to an aqueous environment. The biofilm systems that result can be used beneficially, as exemplified by fixed-film wastewater treatment processes (for example, trickling filters and rotating biological contactors). In addition, biofilms play a major positive role in st…
Single-crystal X-ray analysis has shown the tetrameric structure of the low melting point product obtained from the base catalysed condensation of formaldehyde and para-t-butylphenol and its ability to form a stable cage-type clathrate with toluene.