Materials Literature
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Presented in this paper are the effects of temperature on the early age properties of two rapid-hardening magnesium phosphate-based cements and their combinations, as follows: (a) magnesium phosphate cement for cold and regular weather use; (b) magnesium phosphate cement for hot weather use; (c) a 50-50 blend of magne…
Dielectric behaviour of (Ba, Ca) TiO3 ceramics prepared by conventional and a novel technique has been studied as function of temperature and frequency. It is shown that by ensuring uniform distribution of Ca2+ ions in the BaTiO3 matrix, the transition from the ferroelectric to the paraelectric phase becomes more diff…
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.
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…
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…
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…
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…
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.
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…
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,…
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…
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 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…
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,…
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 >…
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…
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…
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…
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)…
Abstract not Available.