The chemistry and biological function of isoalloxazines (flavines)
G. R. Penzer and G. K. Radda, Q. Rev. Chem. Soc., 1967, 21, 43 DOI: 10.1039/QR9672100043
Materials Literature
文献浏览
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Calculation of the elastic constants and the lattice energy of the polyethylene crystal
Abstract To calculate the elastic constants, (C ij ), of the polyethylene (PE), Born's dynamical theory of long wave method has been used for a model of interatomic interactions representing inter‐ and intramolecular force fields. Among various types of interaction potentials between nonbonded atoms, two sets of H‐H,…
Dynamic mechanical properties and impact strength
Abstract Impact strength and damping as functions of temperature have been compared for eight polymers with typical differences in damping behavior, viz., four methacrylate polymers, a polyphenylene oxide, a polycarbonate, a polyoxymethylene, and a rigid polyethylene. If a damping maximum is caused by a movement withi…
Electron Diffraction Studies of Active, Passive, and Transpassive Oxide Films Formed on Iron
Iron foil specimens were anodically polarized by means of a potentiostat in , , and a sodium borate‐boric acid solution ( p H, 8.5). Both passive, active, and transpassive regions of the polarization curve were studied for each solution. The oxide films were examined while still in contact with the iron foil by select…
On the Theory of Interfacial Energy and Elastic Strain of Epitaxial Overgrowths in Parallel Alignment on Single Crystal Substrates
Abstract Refined expressions, amendable to experimental testing, for the equilibrium elastic strains in epitaxial overgrowths are derived, based on earlier theories by van der Merwe and Cabrera. Continuous films as well as isolated nuclei on substrates are considered.
Electron Monochromator Design
A study has been made of all the known factors which limit the performance of high resolution (0.07 to 0.01 eV FWHM) monochromators. These limiting factors have been incorporated into design equations for the optimum (maximum current output) monochromator. The conclusions are tested by performance measurements on a pr…
Kinetics of alcohol and polyether polyol‐isocyanate reactions using metal catalysts
Abstract A study has been conducted of the kinetics of the reaction of ether alcohols, primary and secondary methoxypropanols, with phenyl isocyanate in the presence of metal catalysts. The proximity of the methoxy and methyl groups to the hydroxyls had a significant effect on the reaction rates as did the type and co…
Der Einfluß der Magnetostriktion auf die magnetische Bereichsstruktur einachsiger Kristalle, insbesondere des Kobalts
Abstract Die Bereichsstrukturen, die auf der Basisebene eines Kobalteinkristalls auftreten, wurden experimentell und theoretisch untersucht. Die Vielfalt der Erscheinungen läßt sich deuten, wenn man zu den bisher betrachteten Energietermen noch die magnetostriktive Eigenenergie hinzunimmt. Diese Energie beherrscht vor…
The effect of molecular weight on the crystallization, melting, and morphology of long‐chain molecules
Abstract The properties of molecular weight fractions of linear polyethylene, encompassing the range 3 × 10 3 to 1.5 × 10 6 , which were isothermally crystallised at low undercooling at. atmospheric pressure, were studied. Marked changes in various thermodynamic and mechanical properties are observed with molecular we…
Improved performance of silicon avalanche oscillators mounted on diamond heat sinks
Silicon avalanche diodes have been mounted on diamond to achieve a continuous power density more than twice that achieved on copper. A pair of parallel connected wafers oa a single sample of diamond produced 4.7 watts of CW power at 13.3 GHz using a room temperature heat sink.
Inert carbon free radicals
Abstract
A vibrational assignment for pyrazole
Infrared spectra of pyrazole in the vapour and solid states and in solution are reported and discussed. From these, and by comparison with the spectra of N-deuterio-, 3-methyl-, and 3,5-dimethyl-pyrazole, and other simple five-membered heterocycles, a vibrational assignment is proposed.
Anisotropy and structure in uniaxially stretched amorphous high polymers
Abstract When an amorphous polymer is stretched uniaxially, the chain molecules are oriented along the stretching direction. Orientation causes an anisotropy of the macroscopic physical properties with rotational symmetry about the stretching direction. The phenomenological treatment of the properties exhibited by a u…
Hydrolysis of uranium mononitride
An experimental study has been made of the hydrolysis of UN in water vapour+argon mixtures of controlled composition. The kinetics of reaction are followed gravimetrically and by estimation of the ammonia liberated. For powdered UN the reaction proceeds rapidly above ∼340°C. Some specimens hydrolyze completely to UO2,…
Metal hydrides. Hydrogenation and isomerization catalysts
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal hydrides. Hydrogenation and isomerization catalystsLynn H. SlaughCite this: J. Org. Chem. 1967, 32, 1, 108–113Publication Date (Print):January 1, 1967Publication History Published online1 May 2002Published inissue 1 January 1967https://pubs.acs.org/doi/10.1021/jo01277a…
Theory of Organic Corrosion Inhibitors
The effect of aniline and aniline derivatives on the electrochemical characteristics of iron in H 2 SO 4 has been studied using relaxation techniques. Armco iron corrosion was found to be inhibited primarily by an adsorption mechanism. However, evidence was noted which suggested a contribution from a “surface chelate.…
The thermal decomposition of oxalates. Part IX. The thermal decomposition of the oxalate complexes of iron
The thermal and X-ray analysis has been made of the decomposition of the trisoxalato-complexes potassium ferric oxalate, sodium ferric oxalate, and ammonium ferric oxalate. The reaction stoicheiometry is described, and the thermal properties of the ammonium complex have been compared with those of ferrous oxalate and…
Kinetics and Gaseous Products of Thermal Decomposition of Polymers
The application of polymers at ever-increasing temperatures has given impetus to research on the chemistry of thermal decomposition. In recent years polymers have been used for a variety of high-temperature applications, such as cooking vessels, motor insulation, and re-entry vehicle heat shields. Interest in chemistr…
The hydrated electron
The first page of this article is displayed as the abstract.
Kinetics and Mechanism of Bacterial Disinfection by Chlorine Dioxide1
Survival data are presented for a fecal strain of Escherichia coli exposed to three concentrations of chlorine dioxide at four temperatures. Chick's first-order reaction equation is generalized to a pseudo nth-order model. Nonlinear least squares curve-fitting of the survival data to the nth order model was performed…