Materials Literature
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Nancy S. Petersen, Linda L. Cook, Martha L. Stocking, IRT versus Conventional Equating Methods: A Comparative Study of Scale Stability, Journal of Educational Statistics, Vol. 8, No. 2 (Summer, 1983), pp. 137-156
Polymolybdates(VI) have been photochemically reduced to Mov in aqueous solutions containing acetic acid. Carbon dioxide, methane, and succinic acid were isolated as decomposition products of the acetic acid but the quantum yield of their formation was ca. 20 times smaller than that of Mov formation. E.s.r, spin-trappi…
Pitting potential was used recently to asses the aggressiveness of the biological species in the microbial corrosion of aluminum alloys in fuel-water systems. This parameter is analyzed here in relation to the electrolyte composition of the medium, especially with reference to chloride, nitrate, and phosphate levels.…
Four novel liquid crystal classes are presented, namely bi-, tri-, and tetracyclic ethanes, pyridazines, and tetracyclic chloro-diesters. Each class exhibits distinct physical characteristics, such as low viscosities η − 12 cP, low elastic ratios k33/k11 ∼ 1, large mesomorphic ranges −40°C. 250°C, large negative diele…
Les etats de spin de plusieurs complexes de fer(II) ont ete caracterises a partir de la variation de la susceptibilite magnetique entre 4 et 300 K
Simultaneous masking functions (signal level at threshold versus masker level) were obtained for equally intense maskers presented individually and in pairs. The signal was a 2.0-kHz sinusoid. The pairs of maskers were (1) two sinusoids with frequencies 1.9 and 2.1 kHz, (2) two narrow bands of noise (50 Hz wide) cente…
Abstract The depression of glass transition temperature in polystyrene and styrene/divinylbenzene networks, by the addition of ethylbenzene, ethyl acetate, and m ‐diethylbenzene, respectively, has been investigated by differential scanning calorimetry. The predictive quality of the Couchman–Karasz treatment for the co…
Using a simple hydrogenic scattering model, the matrix element with full phase information is derived for the ejection of K-shell electrons from atoms by an energetic electron beam. The scattering kinematics are defined and polar diagrams of the angular dependence of the ejected electron intensity are presented. The e…
Previous measurements of transient photoluminescence (PL) in a-As2S3 have indicated that the PL spectrum is extremely sensitive to the excitation photon energy. In the present paper we show that this sensitivity is also manifest in the total-light decay (TLD), the spectrally integrated PL intensity as a function of ti…
The role of a minor silicate eutectic liquid phase as a transport medium in sintering hot–pressed silicon nitride (β Si3N4) ceramics was identified in the 1970s. A similar mechanism is applicable to hot–pressed Si–Al–O–N ceramic alloys which offer an advantage in control of the final liquid volume and hence in superio…
Torrance et al. have made the interesting observation that several mixed-stack organic compounds undergo transitions from neutral states to ionic states as the temperature or pressure is varied. We examine a simple model of such transitions including Coulomb interaction and hybridization of neutral and ionic states. I…
Seven new glycosides were isolated from the stem of Dregea volubilis (L.) BENTH. The structures of dregeosides Ap1 (1), Ao1 (2), Aa1 (3), A11 (4), C11 (5), Ka1 (6), and Ka1 (7) were deduced on the basis of chemical and spectral evidence as drevogenin A 3-O-3-O-methyl-6-deoxy-β-D-allopyranosyl-(1→4)-β-D-oleandropyranos…
A total of 49 patients were treated using intraarterial cis-platinum infusions at a dose of 100 mg/m2. The patients were separated into three groups. There were 13 patients with metastatic tumors, 10 with recurrent malignant gliomas, and 22 patients with high-grade gliomas who received intraarterial cis-platinum as pa…
Anchoring of (tetraphenylporphinato)manganese(III) acetate to a rigid polymer support considerably enhances the rate of cyclohexene epoxidation by this catalyst.
Ceramic processing of various AB 2 S 4 sulfides with the Th 3 P 4 , CaFe 2 O 4 , and spinel structure types was investigated. These refractory sulfides show good sinterability when fired in flowing H 2 S. They can be densified by a combination of hot‐pressing and hot isostatic pressing into theoretically dense ceramic…
A two‐dimensional numerical model is developed to simulate nonisothermal performance of molten carbonate fuel cells. The model takes account of gas stream utilization due to electrochemical reaction, conductive heat transfer between cell hardware and gas streams, energy transfer accompanying mass addition to the bulk…
The purpose of this study is to investigate the feasibility of pure titanium to the metal-porcelain system.Since thermal expansion coefficient of pure titanium was 9.41×10-6/°C (100-400°C) and was considerably smaller than those of the conventional alloys for porcelain, a porcelain having the thermal expansion coeffic…
A survey is given of simple predictive models and operational definitions of the metallic state. The purpose of this work is to highlight the essential features of electron localization versus itinerancy in both crystalline and disordered materials. Particular attention is given to systems that not only extend to the…
The synthesis of the ‘both-faces’ hindered porphyrins using two different methods is reported. These so-called ‘basket-handle’ porphyrins (BHP) are derived from 5,10,15,20-tetraphenylporphyrin in which two opposite phenyl groups are bridged by alkylene or arylene-p-bisalkylene chains. In addition to the desired compou…
Description This publication presents research data covering corrosion and fracture mechanics of metals, primarily steel, aluminum, and titanium. The papers presented are primarily research in nature although several papers deal with application technology. The papers address: mechanics and basic metal characteristics…