Hydrolysis of Polyesters byRhizopus delemarLipase
Yutaka Tokiwa, Tomoo Suzuki; Hydrolysis of Polyesters by Rhizopus delemar Lipase, Agricultural and Biological Chemistry, Volume 42, Issue 5, 1 May 1978, Pa
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Electron Beam Heating Temperature Profiles in Moderately Thick Cold Stage STEM/SEM Specimens
SUMMARY The analytic solution for the model of electron beam heating a moderately thick STEM/SEM specimen was used to calculate the steady state temperature profiles developed in the bulk of the specimen. For thin specimens one maximum in the temperature profile was found near the surface. The location of this maximum…
Triple point of the lock-in and onset transitions of charge-density waves
We have studied a Landau theory for charge-density waves keeping terms up to sixth order in the free-energy expansion. Even with amplitude modulation, the lock-in transition remains continuous. We construct a phase diagram with three phases: normal, incommensurate, and commensurate meeting at a triple point. With no s…
Microgravity Studies in the Liquid-Phase Immiscible System: Aluminum-Indium
As part of a study to understand the influence of gravity, cooling rate, and composition on the structure of liquid-phase immiscible materials, two alloys, AI-40 wt% In and Ai-70 wt% In, were treated thermally on the SPAR II rocket flight. The treatments involved homogenization at a temperature above the miscibility g…
Hydrogen and deuterium permeation in copper alloys, copper–gold brazing alloys, gold, and the i n s i t u growth of stable oxide permeation barriers
The deuterium permeation through several copper alloys has been measured over a temperature range of 550 to 830 K using the membrane technique. In some cases, the hydrogen permeability was also measured. The results were divided into three categories: common alloys, gold alloys, and stable oxide forming alloys. Common…
Domain-like Incommensurate Charge-Density-Wave States and the First-Order Incommensurate-Commensurate Transitions in Layered Tantalum Dichalcogenides. II. 2H-Polytype
The incommensurate (I) state of the triple charge-density-wave (CDW) in 2H–TaSe 2 is studied on the basis of McMillan's phenomenological free energy. A sufficiently large number of harmonics is taken into account to describe the I state precisely. Model calculations based on this theory predict the first-order incomme…
Orientation dependence of domain wall spacing and losses in 3-percent Si-Fe single crystals.
Single crystals of 3-percent Si-Fe with near
Electrostatic einzel lenses with reduced spherical aberration for use in field-emission guns
Focusing properties and aberration coefficients are calculated for electrostatic einzel lenses suitable for use as preaccelerator lenses in field-emission electron guns. Various lens shapes are analyzed, and asymmetric designs with conical central electrodes are found to have reduced spherical aberration. A lens shape…
Hydrogen Diffusion and Solubility in Silicon Carbide
Tritium diffusion coefficients and deuterium solubilities were measured for silicon carbide. At 500° to 1300° C, measured tritium diffusion coefficients were much lower than the recorded values for metals, whereas the activation energies for diffusion were much higher (30 to 75 kcal/mol). The solubility of deuterium i…
Structural Change Accompanied by Plastic-to-Rubber Transition of SBS Block Copolymers
Abstract It was shown that some block copolymers and their blends with corresponding homopolymers exhibit stress softening. When the specimens are stretched beyond the yield point, they become rubbery and exhibit high elasticity and large recoverable deformation, as a result of a breakup of their original rigid struct…
Crystal field parameters for Eu3+ in KY3F1. II. Intensity parameters
The relative intensities of the transitions occurring in the fluorescence spectrum of KY3F10: 1% Eu have been measured at 77 and 4 K. By using the computed eigenfunctions for each Stark level, the Judd–Ofelt theory is used for calculations of the electric dipole intensities. The nine phenomenological parameters allowe…
Grain boundary sliding and intergranular fracture behaviour of copper bicrystals
An experimental study has been made of the interrelation of grain boundary sliding, crystal deformation and intergranular fracture during creep of copper bicrystals. The observed sliding behaviour was analysed on the basis of the movement of lattice dislocations along the grain boundary. The results show that grain bo…
Light emission from gold particles excited by electron tunneling
After gold particles are deposited onto an oxidized aluminum strip by the evaporation of gold in argon, tunnel junctions can be formed by making contact to the particles with a thin gold film. Red polarized light is emitted from these junctions when a few volts of potential difference is applied. Such junctions can be…
Ring-Chain Transition in Liquid Selenium by a Disordered Chain Model
The structural transition between ring and chain molecules in liquid selenium is explained by a disordered chain model which includes a part of both the Se–8 ring and helical chain conformations in a single molecule. Also are discussed the enthalpy change for the dissociation of chain molecules and the mean length of…
The Properties of Films Formed on Iron Exposed to Inhibitive Solutions
Films formed on iron exposed to phosphate, chromate, nitrite, molybdate, tungstate, and arsenate solutions have been characterized using Auger electron spectroscopy and ellipsometry. It was found that the films could be divided into three groups based on their optical properties. The protective quality of films within…
The use of molecular-orbital calculations on model systems for the prediction of bridging-bond-angle variations in siloxanes, silicates, silicon nitrides and silicon suffides
CNDO/2 molecular-orbital calculations are shown to predict trends in bridging angle, ∠T-Y-T, with reasonable accuracy for gas-phase molecules of the type TX3YTX3, where Y is an anion (= O, OH, S, NH) bridging the tetrahedrally coordinated cations T(= C, Si, Al, Be, B) and where X are the nonbridging anions (= H, F). F…
Iron(III) chelates with hexadentate ligands from triethylenetetramine and .beta.-diketones or salicylaldehyde. Spin state dependent crystal and molecular structures of [Fe(acac)2trien]PF6(S = 5/2), [Fe(acacCl)2trien]PF6(S = 5/2), [Fe(sal)2trien]Cl.2H2O(S = 1/2), and [Fe(sal)2trien]NO3.H2O(S = 1/2)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIron(III) chelates with hexadentate ligands from triethylenetetramine and .beta.-diketones or salicylaldehyde. Spin state dependent crystal and molecular structures of [Fe(acac)2trien]PF6(S = 5/2), [Fe(acacCl)2trien]PF6(S = 5/2), [Fe(sal)2trien]Cl.2H2O(S = 1/2), and [Fe(sal)…
Chirality of oxidized and reduced octadecamolybdodiphosphate anions. Observation of a Pfeiffer effect
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChirality of oxidized and reduced octadecamolybdodiphosphate anions. Observation of a Pfeiffer effectJames F. Garvey and Michael T. PopeCite this: Inorg. Chem. 1978, 17, 5, 1115–1118Publication Date (Print):May 1, 1978Publication History Published online1 May 2002Published i…
Preparation and Some Properties of Chemically Vapor‐Deposited Si‐Rich SiO2 and Si3 N 4 Films
Films of and containing excess Si were prepared by chemical vapor deposition at 700°C by the reaction of gaseous and for the Si‐rich and for the Si‐rich . By adjusting the gas‐phase ratio of the reactants it was possible to vary the amount of Si in the films. Transmission electron microscopy studies revealed that the…
Peroxotitanium(IV) porphyrins. Synthesis, stereochemistry, and properties
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPeroxotitanium(IV) porphyrins. Synthesis, stereochemistry, and propertiesRoger Guilard, Jean Marc Latour, Claude Lecomte, Jean Claude Marchon, Jean Protas, and Denis RipollCite this: Inorg. Chem. 1978, 17, 5, 1228–1237Publication Date (Print):May 1, 1978Publication History P…