Crystal data on calcium borate chloride, Ca2BO3Cl
Single crystals of Ca2BO3Cl grown from CaCl2 flux near 800 °C have space group P21/c and unit-cell constants a = 3.9484 (4), b = 8.692 (2), c = 12.402 (2) A, β = 100.27 (1)°.
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Preparation, structure, and magnetism of a tetranuclear basic quinoline adduct of copper(II) trifluoroacetate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, structure, and magnetism of a tetranuclear basic quinoline adduct of copper(II) trifluoroacetateR. G. Little, James A. Moreland, D. B. W. Yawney, and Robert J. DoedensCite this: J. Am. Chem. Soc. 1974, 96, 12, 3834–3842Publication Date (Print):June 1, 1974Public…
Thermal expansion and the phase transformation in mercury sulphide
Debye rings of several samples of HgS were taken at various temperatures between 20° and 370°C. Impure samples transformed from α-HgS (trigonal) to β-HgS (cubic) at about 300°C in heating and from β to α at about 200°C in cooling. The transformation temperature in heating or cooling shifts upwards for samples of highe…
Polycrystal versus single-crystal strain rate sensitivity of cadmium
Taking polycrystalline cadmium as an example and by utilizing the predicted temperature or strain rate-dependence of the (Hall-Petch) stress-grain size parameters, a reasonably quantitative explanation is given for the grain size dependence of apparent activation volume measurements. The explanation involves the theor…
Cell Lysis of Bacillus subtilis Caused by Intracellular Accumulation of Glucose-1-Phosphate
Mutants deficient in both glucose-6-phosphate dehydrogenase and phosphoglucose isomerase lysed 4 to 5 h after growth in nutrient medium containing glucose, or after prolonged incubation if the medium contained galactose. The lysis could be prevented by the addition of any other rapidly metabolizable carbon source such…
CLOTHING DESIGN FOR COMFORT AND WORK PERFORMANCE IN EXTREME THERMAL ENVIRONMENTS*
A bstract Assessment of the insulation (clo) value and evaporative impedance ( i m /clo) value of a clothing system can provide an accurate estimate of the relative advantages of one garment or fabric over another with respect to the thermal protection and/or strain associated with wearing the clothing. There are effe…
Spectral study of Ne^{+}-bombarded crystalline MgO
Optical-absorption spectra are presented from 3.8 to 7.4 eV of the coloration produced in crystalline MgO by bombardment with 3-MeV ${\mathrm{Ne}}^{+}$ convering a fluence range from ${10}^{14}$ to ${10}^{17}$ ions ${\mathrm{cm}}^{\ensuremath{-}2}$. Dose dependence of absorption at 5.0, 5.8, and 7.0 eV and of the inte…
Polarized crystal absorption spectra and crystal structure for potassium tetrabromoplatinate(II)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolarized crystal absorption spectra and crystal structure for potassium tetrabromoplatinate(II)Roy F. Kroening, Rhonda M. Rush, Don S. Martin, and Jon C. ClardyCite this: Inorg. Chem. 1974, 13, 6, 1366–1373Publication Date (Print):June 1, 1974Publication History Published o…
Polyphenylquinoxalines: Synthesis, characterization, and mechanical properties
The synthesis of polyphenylquinoxalines (PPQ) is discussed in detail. Solutions of PPQ at 20% solids content from stoichiometric quantities of pure reactants are generally metastable, increasing in viscosity and, in some cases, gelling. This can be alleviated without any appreciable detrimental effect upon the polymer…
Diffraction patterns of simple apertures
The Fraunhofer diffraction patterns of the triangle, trapezoid, and hexagon are calculated and displayed in moiré plots. The diffraction pattern of the general polygonal aperture with a finite number of vertices can be calculated in terms of elementary functions.
The glass transition temperature of star-shaped polystyrenes
The glass transition temperatures of linear and four- and six-branched regular star polystyrenes are measured by penetration, differential scanning calorimetry, and a density gradient technique. The results of the three methods show that the glass transition temperature depends on the concentration of chain ends in th…
Dielectric Constants and Molecular Structure of Nematic Liquid Crystals
Measurements are presented of the dielectric constants of some p,p′-n-alyl and n-alkoxy substituted azobenzenes and azoxybenzenes in the nematic and in the isotropic phase. Starting from the dipole-less, p,p′,di-n-alkyl-azobenzenes, a systematic interpretation is given of the influence of the molecular structure on th…
The Size Dependence of the Melting Point of Small Particles of Indium
A Philips E.M. 300 electron microscope operating in the dark field high resolution mode has been used to study the size dependence of the melting points of individual particles of indium. The straight line graph, obtained from a simple thermodynamic treatment of the results, shows that the surface tension at the inter…
Single sheet tester for measuring core losses and permeabilities in a silicon steel sheet
A new method which eliminates some disadvantages of the Epstein method has been developed for the rapid measurement of core losses and permeabilities at 50 or 60 Hz of single-sheet specimens. It is shown that the instrument has the following performance: 1) good correlation of the measured value with Epstein testing,…
Exciton Interaction in Photoluminescence from ZnO
Abstract The luminescence spectra of ZnO platelets at 1.9 K have been investigated under 3371 Å Insor excitation from 5 to 500 kW/cm 2 . New details in the P‐band luminescence (exciton‐exciton scattering) reveal the separation between A and B excitons in ZnO and the stimulated emission in this band is found to be stro…
Starch-Filled Polyvinyl Chloride Plastics-Preparation and Evaluation
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStarch-Filled Polyvinyl Chloride Plastics-Preparation and EvaluationRichard P. Westhoff, Felix H. Otey, Charles L. Mehltretter, and Charles R. RussellCite this: Ind. Eng. Chem. Prod. Res. Dev. 1974, 13, 2, 123–125Publication Date (Print):June 1, 1974Publication History Publi…
Electrical Conduction in Single‐Crystal and Polycrystalline Al 2 O 3 at High Temperatures
The electrical conductivity and ion/electron transference numbers in Al 3 O 3 were determined in a sample configuration designed to eliminate influences of surface and gas‐phase conduction on the bulk behavior. With decreasing O 2 partial pressure over single‐crystal Al 2 O 3 at 1000° to 1650°C, the conductivity decre…
Ion-ion interaction potentials and their application to the theory of alkali halide and alkaline earth dihalide molecules
Interaction potentials of many ion pairs are calculated using the model presented in our previous paper [J. Chem. Phys. 56, 3122 (1972)]. In the calculation of the interactions of two ions, the electron density of the combined system of the ions is assumed to be equal to the sum of the two separate ionic electron dens…
Heat conduction and sound transmission in isotopically disordered harmonic crystals
We investigate some kinetic properties of an isotopically disordered harmonic crystal. We prove rigorously that for almost all disordered chains the transmission coefficient of a plane wave with frequency ω, tN(ω), decays exponentially in N, the length of the disordered chain, with the decay constant proportional to ω…
Magnetic Interactions in Solids
H J Zeiger and G W Pratt Oxford: Clarendon Press 1973 pp xv + 660 price £19.50 Magnetic fields are among the most powerful tools available for the study of the eigenstates of electrons whether these electrons are in free motion, bound in isolated atoms or bound in a condensed phase of matter. The perturbation induced…