Tiling the plane with one tile
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Magnetisation processes and temperature dependence of the magnetomechanical properties of Tb/sub 0.27/Dy/sub 0.73/Fe/sub 1.9/
The static and dynamic magnetomechanical properties of Terfenol have been measured over the temperature range -21 degrees C to +70 degrees C as a function of bias field. The ratio of the change in magnetostriction to the change in magnetization is used to investigate the magnetization process. It is concluded that the…
Gas-phase chemistry of the silaformyl anion, HSiO-
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGas-phase chemistry of the silaformyl anion, HSiO-Scott Gronert, Richard A. J. O'Hair, Stephen Prodnuk, Detlev Suelzle, Robert Damrauer, and Charles H. DePuyCite this: J. Am. Chem. Soc. 1990, 112, 3, 997–1003Publication Date (Print):January 1, 1990Publication History Publish…
Evaporative ion plating: process mechanisms and optimization
The basic discharge mechanisms pertinent to ion plating process are reviewed and some recent findings are highlighted, relating in particular to thermionically enhanced ion plating with an evaporative vapor source. By enhancing the discharge, the cathode sheath can approach collisionless conditions, which allows most…
One-step formation of methyl acetate with methanol used as the sole source and catalysis by Ru II –Sn II cluster complexes
RuII–SnII cluster complexes [Ru(SnCl3)5L]3–(L = MeCN, PPh3) have been found to be effective for the catalytic conversion of methanol to methyl acetate in a single step.
SYNTHESE ET ETUDE ELECTROCHIMIQUE DE POLY(ALKYL-3 SELENOPHENES)
Synthesis of 3-alkyl selenophenes via chloromethyl ketones and acetylenic chlorhydrins is described. The electropolymerisation yields electroactive and soluble polymers with high conductivity in the doped state.
Materials Chemistry at High Temperatures
Conference Overview and the Role of Chemistry in High-Temperature Materials Science and Technology LEO BREWER Department of ChemistIy, University of California, and Materials and Chemical Sciences Div
Studies on flame retardancy of polyacrylonitrile fiber treated by flame‐retardant monomers in cold plasma
Abstract Plasma polymer hexamethyldisiloxane, ethyldichlorophosphate and tris(butoxyethyl)phosphate modified polyacrylonitrile fibers were examined by FTIR, XRF, and SEM and the extend of flame retardancy introduced were checked. Certain levels of concentrations of flame‐retardant elements grafted or coated at the fib…
High Resolution Electron Microscopy Observations of Athermal Omega Phase in Ti-Mo Alloys
The commensurate and incommensurate structural configurations underlying the diffuse scattering from athermal {omega} found in the as-quenched {beta} phase of Ti with 8 and 15 at. % Mo have been investigated by high-resolution electron microscopy. Image interperetations were based on a simulation code developed via ob…
Validity of transition‐zone dosimetry at high atomic number interfaces in megavoltage photon beams
Measurement of dose or dose perturbation factors at high atomic number interfaces are usually performed with a thin-window parallel-plate ion chamber. In a transition region, under nonequilibrium conditions, accuracy of ion chamber readings for the dose measurements has often been questioned. This paper critically ana…
A short method of estimating lifetime of polypropylene film using step-stress tests
Polypropylene films were tested for lifetimes under high electric fields, using both constant and step-stress methods. Various time intervals for the step-stress test and voltages for the constant stress test were selected. The inverse power law was used in the analysis of the experimental data, with the value of the…
Environmental Indicators Based on Freshwater Diatom Assemblages and Its Application to Reconstruction of Paleo-environments
The purpose of this paper is to establish the environmental indicators for reconstruction of freshwater paleoenvironments. Living diatom materials were collected from rivers, lakes, marshes, high moors and lands. Therefore, diatom species were classified on the basis of habitats, as follows.1. Indicator species of the…
Thermal degradation of functionally terminated polybutadienes: Pyrolysis gas chromatography and thermogravimetric studies
Abstract Thermal degradation of functionally terminated liquid polybutadiene polymers, carboxy‐terminated polybutadiene (CTPB), hydroxy‐terminated polybutadiene (HTPB), and poly(butadieneacrylonitrile‐acrylic acid) terpolymer (PBAN) and their cured analogues were studied by pyrolysis gas chromatography in the temperat…
Evidence for peripheral mechanisms inducing tissue tolerance during ontogeny
Tissue grafts from a histoincompatible donor of the same developmental stage were introduced into an early chick embryo host in order to probe the immune response to the graft after birth, when the host has reached immune maturity. Limb buds from B4 or B12 chicken strains were grafted in situ on (B15 x B21)F1 recipien…
One kilowatt per capita
"One kilowatt per capita." Bulletin of the Atomic Scientists, 46(1), pp. 13–14
On the Raman spectroscopic determination of phase distribution in polyethylene
A methodological improvement is proposed for increasing the accuracy of the standard Raman spectroscopic method for the determination of the phase distribution in semicrystalline polyethylene (PE). A computer-assisted least-squares decomposition of the overlapping Raman bands, using analytical band shapes, is applied…
Surface modification of polyolefins for hydrophilicity and bondability: Ozonization and grafting hydrophilic monomers on ozonized polyolefins
Abstract Ozonization is a very efficient, economical, and potentially practical method to modify polypropylene (PP) as well as polyethylene (PE) surfaces. Carbonyl, carboxyl, and hydroperoxide groups can be very conveniently generated by reacting these polymers with ozone. In the case of fibers and powders, surface tr…
Orientation Dependence of Twinning in Commercially Pure Titanium
Orientation dependence of twinning in commercially pure titanium was determined in both single crystals deformed in tension or compression and polycrystals deformed in tension. {\bar1012} and {11\bar22} twins in single crystals, and {\bar1012}, {11\bar21} and {11\bar22} twins in polycrystals occurred depending on the…
An intramolecularly Lewis-base-stabilized Ge=N-compound and a related Ge-Fe complex
3a: 2a (0.24 g, 1 mmol) was added to a solution of la (0.41 g, 1 mmol) and NaPF, (0.18 g, 1 mmol) in 20 mL of dry methanol. The solution turned violet after a few minutes and then progressively dark red. The mixture was stirred for 20 hat room temperature. The solvent was removed in vacuo and the red solid was dissolv…
The crystal structures of CdAl2S4, HgAl2S4, and HgGa2S4
The crystal structures of CdAl 2 S 4 , HgAl 2 S 4 , and HgGa 2 S 4 were solved and refined to R = 0.032, 0.042, and 0.046, respectively. CdAl 2 S 4 and HgGa 2 S 4 crystallize with the thiogallate type structure, space group I [unk]. The positional parameters of S are x = 0.2660(1), y = 0.2770(1), z = 0.1352(1) for CdA…