Point-defect calculations on UO2
This paper summarises methods used and results obtained in calculations on point defect processes in UO2. Enthalpies and entropies are calculated for basic defect formation, ion migration and charge transfer.
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Studies of the degradation of organotin stabilizers in poly(vinyl chloride) during gamma irradiation
Abstract Organotin stabilizers of the type Bu 2 SnX 2 (X = SCH 2 CO 2 C 8 H 17 or O 2 CCHCHCO 2 C 8 H 17 ) present in poly(vinyl chloride) (PVC) and subjected to varying doses of gamma irradiation in the range 1–200 kGy (0.1–20 Mrad) are shown to suffer degradation with dealkylation to form monobutyltin trichloride a…
Effects of calcium addition on the foamability of molten aluminum.
A new process for producing porous aluminum by the foaming technique was developed. In the process, molten aluminum into which Ca has been added before the stage of viscosity rise is stirred to disperse oxide films into the melt. Adding Ca results in considerable shortening of the time for viscosity rise because of pr…
Analysis of waveguide gratings: a comparison of the results of Rouard’s method and coupled-mode theory
Recently we introduced a new computational tool for the analysis of waveguide diffraction gratings based on Rouard’s method, a recursive technique used in thin-film coating design. In this paper we compare the reflectivities predicted by Rouard’s method with those found by using the ideal mode expansion of coupled-mod…
Thermal behaviour of films of partially neutralized poly(acrylic acid). 1: Influence of metal ions
Abstract A series of partially neutralized poly(acrylates) has been prepared, and reactions occurring on heating them at 250°C have been studied. It was found that different chemical processes occurred at this temperature, depending on the nature of the counter ion. Univalent cations gave films of excellent chemical r…
Influence of experimental inaccuracies on corrosion rates and Tafel slopes determined from electrochemical measurements in different overpotential ranges
It is shown that electrochemical observations (over a small range of overpotentials) which may be subject to relatively small (< 1%) experimental inaccuracies can lead to results that are seriously (> 100%) in error when analysis of the results is performed using traditional analysis techniques.
Polarized, single-crystal, electronic spectral studies of hexachlorodicuprate(2-): excited-state effects of binuclear interaction
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolarized, single-crystal, electronic spectral studies of hexachlorodicuprate(2-): excited-state effects of binuclear interactionSylvie R. Desjardins, Dean E. Wilcox, Ronald L. Musselman, and Edward I. SolomonCite this: Inorg. Chem. 1987, 26, 2, 288–300Publication Date (Prin…
Impulse Breakdown Characteristics of Coated Electrodes in SF6 Gas
The authors investigated the impulse breakdown characteristics of coated high-voltage electrodes in SF6 gas with a varying nonuniform factor, electrode area, and coating material. From the viewpoint of the relation between breakdown stress and the stressed electrode area, it was clarified that with coated electrodes,…
Plant Anticancer Agents, XLIV. Cytotoxic Constituents from Stizophyllum riparium
Bioactivity-guided fractionation of a CHCl3 extract of Stizophyllum riparium has afforded six new compounds, namely, the triterpene esters, 3 beta-hydroxy-24-transferulyloxyurs-12-en-28-oic acid, 3 beta-hydroxy-24-cis-ferulyloxyurs-12-en-28-oic acid, 3 beta, 19-dihydroxy-24-trans-ferulyloxyurs-12-en-28-oic acid, and t…
Free radicals as clathrate hosts: crystal and molecular structure of 1: 1 perchlorotriphenylmethyl radical–benzene
The perchlorotriphenylmethyl radical (2) acts as a clathrate host for benzene, halogenobenzenes, and 1,4-dioxane giving inclusion compounds with different stabilities; the structure of (2)·C6H6, established by X-ray diffraction, shows the guest molecules located in channels between the hosts.
The crystal structure of high temperature form of kalsilite (KAlSiO4) at 950.DEG.C.
The crystal structure of kalsilite at 950°C has been determined by high temperature single crystal methods. In the process of heating, the X-ray powder pattern of kalsilite changes at 865°C, which can be ascribed to the phase transition of this mineral. According to the drastic apparition of the extinction of hhl, 1-o…
The Structure of μ-Aquabis(μ-trichloroacetato)bis[aquabis(trichloroacetato)erbium(III)] Hydrate, [{Er(CCl3CO2)2(H2O)}2(CCl3CO2)2(H2O)]n·nH2O
Abstract The structure of the title complex has been determined by the single-crystal X-ray diffraction method. A crystal of Er2C12H8O16Cl18, F. W. 1380.86 is triclinic, with the space group of P\bar1, a=12.787(8), b=15.209(7), c=11.685(7) Å, α=102.24(5), β=114.43(5), γ=70.59(4)°, Z=2 (for the dimer formula), Dx=2.36,…
Metal–oxo photo-oxidants. Photochemistry and photophysics of trans-[Os VI (tmc)(O) 2 ] 2+ (tmc = 1,4,8,11-tetramethyl-1,4,8,11-tetra-azacyclotetradecane) and trans-[Os VI (CN) 4 (O) 2 ] 2–
trans-[OsVI(tmc)(O)2]2+(tmc = 1,4,8,11-tetramethyl-1,4,8,11-tetra-azacyclotetradecane) and trans-[OsVI(CN)4(O)2]2– are emissive in the solid state and in fluid solutions at room temperature (τ∼ 1.0–1.5 µs); the 3Eg state of trans-[OsVI(tmc)(O)2]2+ is a powerful one-electron oxidant {[OsVI(O)2]2++ e–→[OsV(O)2]+, Ef0 >…
Progress in the Knowledge of Nodular Corrosion
Zircaloy in boiling water reactor (BWR) systems often exhibits, besides slight uniform corrosion, a nodular type of corrosion. Highest nodular corrosion was found with materials never β-quenched during their fabrication, whereas β-quenched materials generally showed an improved behavior. Results of nodule thickness me…
Photoemission from Nearly Free Electron Metals
The properties of the angle resolved photoemission spectra from nearly free electron (NFE) metals have been investigated for a wide range of electron densities, from K (1.4 × 10 22 electrons/cm 3 ) through Be (24.7 × 10 22 electrons/cm 3 ). These data are used in conjunction with theoretical calculations to illustrate…
Determination of Deuterium Diffusion Coefficient in Metals by Ion Driven Permeation Technique
In order to determine the deuterium diffusion coefficient in metals, we have developed a new technique, ion driven permeation in which the implantation of energetic ions is utilized instead of gaseous charging or electrochemical charging for deuterium permeation.The time sequence of deuterium permeation rate caused by…
Effect of Microstructure on the Toughness of Hot Work Tool Steels, AISI H13, H10, and H19
Microstructures of hot work tool steels, AISI H13, HIO, and H19 tempered after quenching at various cooling rates are studied for improvements of the toughness of these steels. It is found that the development of upper bainite with decreasing rate of quenching is accompanied by the following microstructural changes.1)…
The Use of Photocurrents to Characterize Anodic Films on Ti, Zr, Cu, and 304 Stainless Steel
Abstract not Available.
Fibrin Adhesive: Its Use in Selected Skin Grafting
The use of a fibrin adhesive to ensure the fixation of skin grafts in difficult situations was evaluated in 27 patients. Fibrin adhesive offers a fast and safe alternative to conventional methods, especially when dealing with concavities or other surfaces where it is impossible to obtain adequate fixation and prevent…
Adhesion of polyimides to metals and metal oxides
Interface reactions between polyimides and metal/metal oxide surfaces are proposed on the basis of their acid-base strengths. These hypothetical interface reactions are discussed for the purpose of understanding adhesion at these interfaces. Some experimental data are presented to support the hypothesis as it relates…