Photoemission and the Electronic Properties of Surfaces
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General derivation of the WLF equation from a fluctuation approach to the glass transition
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…
Mode of action of pesticin: N-acetylglucosaminidase activity
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…
Effect of Avalanche Space Charge Field on the Calculation of Corona Onset Voltage
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 from Escherichia coli : Quaternary Structure, Amino-Terminal Sequence, Substrate Specificity, and Absence of a Separate Valine-α-Ketoglutarate Activity
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…
On the glass transition temperature of comblike polymers: Effects of side chain length and backbone chain structure
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…
Untersuchungen zur Plasmaätzung von Polymeren. Teil I: Strukturänderungen von Polymeren nach Plasmaätzung
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…
Lattice parameter, microstrains and non-stoichiometry in NiO. Comparison between mosaic microcrystals and quasi-perfect single microcrystals
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…
Ammonia oxidation over UV-irradiated titanium dioxide at room temperature
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…
Colloidal Redox Catalysts for Evolution of Oxygen and for Light‐Induced Evolution of Hydrogen from Water
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.
Energy Dynamics of SPT
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…
Polymorphic structures of poly(tetramethylene adipate)
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…
Influence of Electric Charge and Humidity Upon the Diffusion Coefficient of Radon Decay Products
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…
Electronic structure of Ru2(O2CR)4+ and Rh2(O2CR)4+ complexes
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…
Binuclear complexes of macrocyclic ligands. Electrochemical and spectral properties of homobinuclear CuIICuII, CuIICuI, and CuICuI species including an estimated intramolecular electron transfer rate
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…
Absolute pressure measurements and analysis of diamonds subjected to maximum static pressures of 1.3–1.7 Mbar
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…
Microstructure of cold-rolled copper
Optical and electron metallography have been used to examine the substructures developed in OFHC copper after rolling reductions from 50–97%. These structures are related to the displacements observed at free surfaces after deformation. It is shown that deformation occurs in a series of overlapping stages in each of w…
Accurate X-ray determination of the lattice parameters and the thermal expansion coefficients of VO2near the transition temperature
Accurate lattice parameters and thermal expansion coefficients of the low- and high-temperature phases of VO2 have been determined from measurements on single crystals with the Bond method [Acta Cryst. (1960), 13, 814–818]. The transition from a semi-conducting to a metallic phase occurs over a temperature range of 0.…
Revised and new crystal data for indium selenides
A redetermination of crystal data for InSe (hexagonal), α-In2Se3 (rhombohedral), α-In2Se3 (hexagonal), β-In2Se3 (rhombohedral), γ-In2Se3 (hexagonal), and δ-In2Se3 (hexagonal) has been undertaken because of discrepancies among the published results in the literature and in the JCPDS Powder Diffraction File.
Adiabatic Plastic Deformation
Adiabatic plastic may play a role in such widely diverse areas as ballistic impact, explosive fragmentation, cryogenic behavior of materials, high velocity shaping and forming, machining, grinding 0), surface frictional effects, erosion (2), and seismic faulting. All of the shearing phenomena are based on two facts: A…