Materials Literature
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Description Twenty-two papers address: quality requirements for better bearing steels; new methods to evaluate quality of better bearing steels; and new processes to produce better bearing steels.
A servo actuator using shape-memory alloy (SMA actuator), which performs special functions not found in conventional actuators, is expected to be a new driving source for future robots. This paper evaluates its performance and discusses the fundamental issues in designing such actuators. Being driven by the thermal ma…
A ruthenium porphyrin catalyses the epoxidation of several cholest-5-ene derivatives by air in high yield and with nearly complete β-stereospecificity; C-3-unprotected cholesterol is unaffected, but cholesteryl acetate gives nearly pure (>99%) 5β,6β-epoxide.
A newly developed technique for SEM sample preparation has been applied in the study of the effects of process parameters on the microstructure of gum arabic spray-dried microcapsules. The technique, that employs embedding in an apolar resin and partial polymerization makes it possible to simultaneously observe the in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-resolution solid-state carbon-13 NMR spectra of porphine and 5,10,15-20-tetraalkylporphyrins: implications for the nitrogen-hydrogen tautomerization processLucio. Frydman, Alejandro C. Olivieri, Luis E. Diaz, Benjamin. Frydman, Frederick G. Morin, Charles L. Mayne, Davi…
To quantify the solute redistribution during solidification, an approximate solution of the Brody-Flemings model of dendritic solidification has been derived on the assumption of parabolic solidification and a constant partition ratio, and compared with an exact solution of the model. It has been shown that the approx…
The effect of cold work on the stress corrosion cracking (SCC) of solution-annealed (nonsensitized) AISI(1) 304 stainless steel (SS) in 288 C oxygenated pure water was studied utilizing creviced bent beam (CBB) tests. The SCC susceptibility increased with an increased degree of cold work, especially when above 40%. Th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect conversion of benzene to hydroquinone. Cooperative action of copper(I) ion and dioxygenSotaro Ito, Atsutaka Kunai, Hiroshi Okada, and Kazuo SasakiCite this: J. Org. Chem. 1988, 53, 2, 296–300Publication Date (Print):January 1, 1988Publication History Published online1…
A new rapid and simple method for electron microscopy of paraffin-embedded material is described. The paraffin-embedded tissue is deparaffinized in xylene, stained in a 0.01% toluidine blue/absolute ethanol solution, infiltrated in a propylene oxide/resin mixture, and embedded in epoxy resin. This quick method, which…
A set of thermoviscoplastic nonlinear constitutive relationships (TVP-NCR) is presented. This set is unique and has been developed mainly for application to high-temperature metal matrix composites (HT-MMC) and is applicable to thermal and mechanical properties. Formulation of the TVP-NCR is based at the micromechanic…
Abstract High-resolution solid-state 1H and 31P NMR revealed that there were at least three different states for protons of H3PW12O40·nH2O; (i) protons present in highly hydrated samples, (ii) protonated water which is hydrogen-bonded to terminal oxygen, W = O···H+ (H2O)2 (n \doteqdot 6), and (iii) proton which is dir…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiffusive anion exchange in polypyrrole filmsLarry S. Curtin, Glenn C. Komplin, and William J. PietroCite this: J. Phys. Chem. 1988, 92, 1, 12–13Publication Date (Print):January 1, 1988Publication History Published online1 May 2002Published inissue 1 January 1988https://pubs…
Abstract A simple model is developed to explain the measured temperature dependence of the growth rate of polymerfilms in a C 6 H 6 ‐Ne‐glow discharge. The negative Arrhenius‐behaviour obtained that means a decreasing growth rate with increasing temperature — is determined by an adsorption‐desorption‐equilibrium of th…
Silicon carbide has been grown at 1100 to 1400 °C by chemical vapor deposition using CH3SiCl3 and H2 gaseous mixture onto a graphite substrate. The effect of deposition temperature, total system pressure, and the CH3SiCl3 input fraction on growth characteristics and structure of deposits has been studied. The experime…
Macromolecular assemblies can be self-organized into patterns with controllable feature sizes ranging from ∼10 Å to ∼100 μm. Smallest features are produced by organizing macromolecules into a Langmuir–Blodgett film. Using this method, we have produced quasiperiodic arrays of metal oxide islands with peroidicities as s…
1. Equilibrium of Chemical and Electrochemical Reactions. Galvanic cells. The potential of the cell reaction. The electrodes. Equilibria potential expressed by the formal potential. Equilibrium of the cell reaction. Electrochemical equilibrium diagrams. The equilibrium diagram of water. Electrochemical equilibrium dia…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric normal mode process in semidilute and concentrated solutions of cis-polyisopreneKeiichiro Adachi and Tadao KotakaCite this: Macromolecules 1988, 21, 1, 157–164Publication Date (Print):January 1, 1988Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-valent iron phthalocyanine .mu.-nitrido dimersClaudio Ercolani, Marcello Gardini, Giovanna Pennesi, Gentilina Rossi, and Umberto RussoCite this: Inorg. Chem. 1988, 27, 2, 422–424Publication Date (Print):January 1, 1988Publication History Published online1 May 2002Publis…
The preparation of the 2,3,9,10,16,17,23,24-octabutoxyphthalocyanine zinc complex (1) is described. The electron-donating groups influence the properties of the compound. The oxidation–reduction potentials studied by cyclic voltammetry in solution shift by ca. 20 mV in the cathodic direction showing easier oxidation a…
A statement of the general principles of capillary condensation in porous networks and the ascertainment of its particularities for a given structure are difficult, since either independent or dependent vapour–liquid transitions arise at each point of the network and also because porous materials occurring in nature a…