Materials Literature
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The thermal expansion and the forced volume magnetostriction have been measured for the Invar type Fe-Pt alloys. Derived values of the spontaneous volume magnetostriction are large and the same order of magnitude as those for the Fe-Ni Invar alloys. Their dependence on concentration and chemical ordering can be explai…
The pressure dependences of the dielectric properties and phase transitions of squaric acid, H2C4O4, and its deuterated analog, D2C4O4, were investigated. The transition temperatures at 1 bar are 375.5±1.0 K and 527.5±2.0 K, respectively, and decrease with pressure at initial rates of 105.6±2.0 K/GPa and 102.5±2.0K/GP…
Lutetium diphthalocyanine can be electrolyzed reversibly in dimethylformamide to give four different colored solutions: violet, blue, green, and yellow‐red. Two of these solutions, the violet and the green, also exhibit electron paramagnetic resonance (EPR) signals indicative of organic‐free radicals. The blue and the…
The corrosion of 90:10 Cu:Ni and 70:30 Cu:Ni alloys in sulfide polluted flowing sea water has been studied as a function of sulfide concentration. The experimental techniques used include small amplitude cyclic voltammetry, AC impedance measurements, large amplitude cyclic voltammetry, and extensive surface examinatio…
Abstract not Available.
Abstract In the frame of a fluctuation approach to the glass transition, it is shown from a scaling argument that the product δ In v δ T (≈ 15 K for polymers) is invariant with respect to the temperature or frequency dependence of the glass transition in homogeneous amorphous substances. With the aid of a differential…
Homogeneous preparations of pesticin, a bacteriocin produced by Yersinia pestis, neither significantly inhibited net synthesis of deoxyribonucleic acid, ribonucleic acid, or protein in Escherichia coli phi nor caused detectable degradation of deoxyribonucleic acid in vivo. Accordingly, its mode of action does not rese…
Many researchers have suggested that the space charge field of the primary electron avalanche should not be neglected in calculating the corona onset voltage based on the streamer criterion. Some researchers consider only the space charge field of the positive ions created during the avalanche growth, while others con…
Transaminase B (branched-chain amino acid aminotransferase, EC 2.6.1.42), the ilvE gene product, was purified to apparent homogeneity from an Escherichia coli K-12 strain which carries the ilvE gene both on the host chromosome and on a plasmid. The oligomeric structure of the enzyme, as determined by analytical ultrac…
Abstract Polymers composed of monomer units that contain n ‐alkyl side chains are characterized by a monotonical decrease in the glass transition temperatures toward a critical value ( T g ) c as the number of C atoms in the side chain increases toward a corresponding critical value n c . Thus the glass transition tem…
Abstract Polymere werden im Plasma einer elektrischen Entladung an der Oberfläche funktionalisiert (oxydiert) bzw. abgebaut. Daneben wurde jeweils ein signifikanter, auf eine 5 bis 10 μm starke Schicht an der Oberfläche beschränkter Volumeneffekt („Tiefeneffekt”︁) beobachtet, der durch die Plasma‐UV‐Strahlung verursac…
Twelve samples of three kinds of highly divided nickel oxide, prepared from nickel hydroxide at low temperature, have been compared from the double point of view of mean lattice parameter variation (uniform strain) and lattice microstrains (non-uniform strain). These samples are black non-stoichiometric NiO with a mos…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAmmonia oxidation over UV-irradiated titanium dioxide at room temperatureHenri. Mozzanega, Jean Marie. Herrmann, and Pierre. PichatCite this: J. Phys. Chem. 1979, 83, 17, 2251–2255Publication Date (Print):August 1, 1979Publication History Published online1 May 2002Published…
Chemical utilization of the sun's radiation is very attractive aim. The evolution of oxygen and, on irradiation, hydrogen from water in the presence of redox catalysts are known, but rather slow processes. Colloidal ruthenium and other metals catalyze these reactions better than less finely divided materials.
The writers report on the dynamics of the standard penetration test (SPT) as determined from a study involving hammer impact and wave mechanics theory, field measurements of dynamic behavior during SPT, and computer simulations using the wave equation as developed for computer studies of pile driving. The field data m…
X-ray diffraction and differential scanning calorimetry studies show that the linear polyester poly (tetramethylene adipate) (PTMA) can exist in two polymorphic forms in the solid state, which are designated α- and β-PTMA. The α form is obtained by annealing a stretched film at 52°C for several days. The unit cell is…
The diffusivity of freshly formed thoron decay products was studied under a variety of conditions with respect to relative humidity and electric charge and over a range of thoron concentrations from 340 nCi/l to 3.4 × I05 nCi/l. 85–88% of ThB(212Pb) atoms carried a positive charge when formed. In moist air (30% < rela…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure of Ru2(O2CR)4+ and Rh2(O2CR)4+ complexesJoe G. Norman Jr., George E. Renzoni, and David A. CaseCite this: J. Am. Chem. Soc. 1979, 101, 18, 5256–5267Publication Date (Print):August 1, 1979Publication History Published online1 May 2002Published inissue 1 A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBinuclear complexes of macrocyclic ligands. Electrochemical and spectral properties of homobinuclear CuIICuII, CuIICuI, and CuICuI species including an estimated intramolecular electron transfer rateRobert R. Gagne, Carl A. Koval, Thomas J. Smith, and Marc C. CimolinoCite th…
Force per unit area measurements made in the megabar pressure cell, independently of other pressure calibration systems, are consistent with the ruby R1 scale of Mao, Bell, Shaner, and Steinberg and its extrapolation to 1.4 Mbar. Physical analysis of diamond anvils removed after experiments to maximum pressures of 1.3…