Materials Literature
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Crystals of CaF2 containing different concentrations of Ce3+ and Mn2+ ions were investigated by means of optical absorption and photoluminescence. The results suggest the preferential pairing of the Mn2+ ions with Ce3+ ions in tetragonal sites (i.e. sites in which the Ce3+ ion is locally compensated by an F-interstiti…
Abstract A semiempirical method is proposed, by which the role of kinetical constraints to the growth in closed tube chemical vapour transport can be evidenced. The method is based on the evaluation of the ratio (Φ) between the quantity D which is related to the semiempirically‐determined average diffusivity of the ga…
Abstract The Poole‐Frenkel effect is often observed in the field‐dependent properties of amorphous materials. Experimentally, it is frequently found that the slopes of log σ versus E 1/2 plots differ from that predicted by the Poole‐Frenkel equation and several theorems have been postulated to explain this discrepancy…
Abstract The development of low toxicity rigid epoxy foams as an alternative to polyurethane foams for electronics encapsulation is described. The basic foam components ‐ epoxy resin, hardener, accelerator, blowing agent and surfactant ‐ are blended to form a two part system which is mixed and foamed when required. Ea…
Article Die Bedeutung der Austenitumwandlung für die Eigenspannungsentstehung beim Schweißen was published on September 1, 1986 in the journal HTM Journal of Heat Treatment and Materials (volume 41, issue 5).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDehydrobromination of 1,2-dibromoethyoxyethane using various amine basesWayne M. Stalick, Ali Khorrami, and Kimi S. HattonCite this: J. Org. Chem. 1986, 51, 19, 3577–3581Publication Date (Print):September 1, 1986Publication History Published online1 May 2002Published inissue…
Abstract The crystal structure of bis-1,2,5-thiadiazolotetracyanoquinodimethane showed stacks of two-dimensionally expanded sheet-like networks, in which the roughly coplanar molesules are connected to one another by way of the rhombohedral linkage involving short S–NC contacts of 3.03 Å.
For the investigation of magnetic properties at frequencies between 5 mHz and 400 Hz we present an electronic device for measurements at well defined time dependence of the magnetic field strength or the flux density. Any function which is monotonous between two peak values can be produced. The measuring device may be…
An experimental investigation on a low-power dc arcjet with helium propellant was conducted. Objectives were to evaluate the thermal efficiency, to assess the performance of various cathode materials, and to investigate the effects of transpirational cooling from the electrodes. The anode was made of porous tungsten s…
In continuation of their development of the water-equivalent polyethylene-based phantom material RW-1 for X-rays in the tube voltage range 10-100 kV (see Hermann et al., ibid., vol.30, p.1195-200, 1985), the authors have developed a muscle-equivalent material, RM-1, and a fat-equivalent material, RF-1, for the same vo…
The magnetocrystalline anisotropy constants, K1, of the Sendust alloys (7∼11wt%Si, 4∼7wt%Al, bal.Fe) were determined as a function of the temperature between -196°C and 600°C by means of a torque magnetometer. The sign of K1is negative at -196°C and the magnitude is fairly large (e.g.\approx10^{4}erg/cm3) for most all…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and stereochemical-electrochemical investigations of the 49/48-Electron [Co3(.eta.5-C5H5-xMex)3(.mu.3-NO)(.mu.3-NH)]n Series (x = 0, 1;n=0,1+ ): Bonding Analysis of a Marked Redox-Generated Change in Geometry of a Triangular Metal Cluster with .pi.=Acceptor Nitrosy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIn-situ electron microscopy studies of the behavior of supported ruthenium particles. 2. Carbon deposition from catalyzed decomposition of acetyleneR. T. K. Baker and J. J. Chludzinski Jr.Cite this: J. Phys. Chem. 1986, 90, 20, 4734–4738Publication Date (Print):September 1,…
Abstract Two distinguishable effects of thermal exposure of biaxially oriented poly(ethylene terephthalate) (PET) have been observed in the temperature range from room temperature to 140°C. Upon heating above the glass transition temperature T g of the film an irreversible shrinkage of a few percent occurred with a co…
Abstract In an attempt to modify water‐soluble synthetic polymers, graft Copolymerization of methylmethacrylate (MMA) and ethyl acrylate (EA) onto poly(vinyl alcohol), PVA, has been studied by using gamma irradiation from a Co 60 source as initiator. The graft copolymerization was carried out in an aqueous medium by t…
ABSTRACT We have examined the influence of temperature, protein synthesis, and energy metabolism on the process of silicon biomineralization in synchronized cultures of the diatom Navicula saprophilia Lange‐Bertalot & Bonik (1976). Temperature effects on silicon polymerization were compared in vitro and in vivo. I…
The polycondensation kinetics of aromatic nucleophilic substitution on 1,4-dichlorobenzene by sodium sulfide has been investigated at 195°C in N-methyl pyrrolidone. The reaction follows second-order kinetics. The rate is bimodal with an initial slow rate till 50% conversion followed by a faster rate between 50 and 97%…
The present paper is concerned with the production of very low core loss grain-oriented silicon steel. Domain refining techniques and their mechanisms have been studied. A quantitative interpretation for the domain refining phenomena is not sufficient. However, it is anticipated that these results will be based on the…
Hexasubstituted tribenzocyclononene derivatives with R = -OC(O)C 6 H 4 C n H 2n+i and R = -OC(O)C 6 H 4 OC n H 2n+1 possess enantiotropic pyramidic mesophases. These mesophases exhibit an uncommon feature in that their optical anisotropy changes sign as function of temperature within the mesophase region. It is sugges…
A three-dimensional mathematical model was developed for calculating joule heat release, glass flow, and heat transfer in electric glass furnaces. The model developed here allows for multiple electrodes, multiphase firing, and for the feeding and withdrawal of molten glass. The model is fairly general with respect to…