Materials Literature
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A photoemission study of formation and oxidation of rare earth/magnesium interfaces is presented. Our results indicate that a thin, rare earth rich amorphous surface alloy forms when the rare earths Ce or Pr are evaporated onto a magnesium substrate at room temperature. When these systems subsequently were exposed to…
Abstract In a study of “rana” soils of central Spain, hydroxy-interlayered 2:1 clay minerals were identified in the upper horizons and high-charge smectite in the lower horizons, with kaolinite the most abundant phyllosilicate. The high-charge smectite showed a basal spacing of 18 Å on Mg-saturation and glycerol solva…
There was few post irradiation examination data on the mechanical properties of domestic fuel cladding tubes used for light water reactors, then those data obtained abroad have been often used in the fuel design or fuel performance codes. Although, many reports discussed the deformation mechanism of the tube, almost a…
The effect of controlled heterogeneous nucleation by platinum on the crystallization of a ZrF 4 ‐BaF 2 ‐LaF 3 ‐AlF 3 ‐NaF (ZBLAN) glass was studied. Various levels of platinum were incorporated into this glass by a combination of PtCl 2 ‐doping and melting‐atmosphere variation. The effect of doping levels and melting…
A simplified method for the analysis of hysteresis characteristics in a transformer under nonsinusoidal excitation is discussed. The nonsinusoidal sin m (wt) waveforms are used in the experiments. The hysteresis analysis is treated as a shape identification problem and is solved using the piecewise curve fitting techn…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModeling the heteroleptic equilibria of organized molecular systems by using a double-titration technique: a novel determination of the fundamental equilibrium constants in a ternary system involving a macrocyclic cobalt(II) complex, dioxygen, and competing axial ligandsNaid…
Abstract Catalysts for environmental protection. The main emitters of anthropogenic air pollution are internal combustion engines, power plants, and production processes. Components of exhaust gases which are regarded as pollutants are hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NO x ), sulfur dioxide (S…
Experimental techniques are described for determining the eutectic composition of multicomponent mixtures of nematic liquid crystals. These techniques were applied to the formulation of nematic esters, when the idealized eutectic composition calculated by the Schroeder-Van Laar relationship did not give a good melting…
It is demonstrated from an i.r. study of the adsorption of formic acid on a Co/SiO2 catalyst that the adsorbates on the SiO2 surface and on the cobalt metal clusters are respectively a physically bonded HCOOH molecule and a formate species. The former species is easily desorbed but the latter remains stable at least u…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSeparation of p-cresol from its mixture with 2,6-xylenol by adductive crystallizationVivek K. Jadhav, Madhav R. Chivate, and Narayan S. TavareCite this: J. Chem. Eng. Data 1991, 36, 2, 249–251Publication Date (Print):April 1, 1991Publication History Published online1 May 200…
Abstract Advanced composites, specifically carbon‐fiber‐reinforced epoxies, are used extensively for a variety of demanding structural applications, primarily because of their high strength‐to‐weight and stiffness‐to‐weight ratios, corrosion resistance, and damage tolerance characteristics. Electron beam (EB) treatmen…
Abstract This study examines for the first time how matrix crosslinking affects the composite physical and mechanical properties of a graphite fiber reinforced PMR polyimide composite during long‐term isothermal aging. Unidirectional composite specimens of Celion 6000/PMR‐P1 were isothermally exposed at 288°C in air f…
An overview of high-temperature gas-cooled reactor (HTR) fission product chemistry and its influence on source terms in core heatup accidents is given. These accidents are risk-dominating for medium-sized HTRs and are characterized by maximum core temperatures of ∼2500°C (2773 K) and a late-starting, slowly proceeding…
Microwave dielectric parameters are measured for lithium-zinc ferrites with chemical formula Li0.5−x/2Fe2.5−x/2ZnxO4 (x=0.0, 0.1, 0.3, 0.5, 0.6). All the samples except x=0.5, show an increase in the dielectric loss with temperature. A relaxation-type mechanism is observed for x=0.5. The results are compared with the…
4-n-Alkyl-4′-cyanobiphenyls (1) have achieved widespread application as stable thermotropic liquid crystals with mesophases at room temperature. The importance of the cyano functional group in the liquid-crystalline behaviour of these compounds is not clearly defined. By modifying this functional group with minimal ch…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and rubber elasticity of end-linked poly(tetrahydrofuran) elastomerLei Jong and R. S. SteinCite this: Macromolecules 1991, 24, 9, 2323–2329Publication Date (Print):April 29, 1991Publication History Published online1 May 2002Published inissue 29 A…
Abstract The plate method was used to measure the surface tension of different epoxy prepolymers and different hardeners. The values are correlated to the chemical structure. The effect of molecular weight is very weak for diglycidyl ether of bisphenol A (DGEBA) prepolymers. For α,ω‐diamino‐terminated poly(propylene o…
Regions of incomplete charge collection, or dead layers, are compared for Si(Li) detectors fabricated with Au and Pd entrance-window electrodes. The dead layers were measured by characterizing the detector spectral response to X-ray energies above and below the Si K alpha absorption edge. It was found that Si(Li) dete…
A new data-acquisition and display system has been developed for magnetic domain observation using spin-polarized scanning electron microscopy. The system is composed of 32 frame memories (512×512×16 bit), an image processor with two high-speed digital signal processors, and a 1280×1024 pixel color monitor. It has the…
Chitosan has been reductively N-alkylated with a 6-O-substituted galactose derivative bearing an iminodiacetate residue, to give a chitosan derivative having a hydrophilic branch and a metal chelating group. The Cu(II) binding capacity of the derivative was comparable to native chitosan, but showed better ion-exchange…