On the use of grinding additives in cement grinding
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Materials Literature
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Determination of sulphates in cements and gypsum
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Determinación of grinding aptness and specific energy consumption according to Bond's test for the grinding of minerals and rocks
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Quality test of soil cement work
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Determination of cement content in sea mortars and concretes: data for the up to date use of the method
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Volume Changes Accompanying the Extension of Rubber
The volume changes accompanying extension of peroxide vulcanizates of natural gum rubber were measured using a dilatometer technique. Measurements of the force-extension behavior and compressibilities were made on the same samples for the range of extension and volume change covered in the volume experiments. A consta…
Lattice parameters of ZnO from 4.2° to 296°K
The temperature dependence of the lattice parameters of ZnO was measured by x-ray powder-diffraction methods. Retrograde behavior was found to occur perpendicular to the c axis at 93°K. Lattice parameters at 4.2°K were a0=3.24826±0.00015Å, c0=5.2033±0.0018 Å. These results are compared with those for some other II-VI…
Initial Sintering with Constant Rates of Heating
Initial sintering of several materials was studied by measuring powder compact densification at constant rates of heating (CRH). The CRH technique was extremely sensitive to the particle size distribution and other characteristics of the compacts. Although the CRH method circumvents several problems encountered in iso…
THE TRANSFORMATION OF CLAY MINERALS DURING DIAGENESIS AND LOW‐GRADE METAMORPHISM: A REVIEW
Summary The results obtained by the author in the study of clay‐minerals diagenesis are compared critically with the principal publications in this field, giving a general picture of the transformation of sheet silicates. Kaolinite minerals are related to the surficial zones of the earth's crust where they are formed.…
Temperature Dependence of Normal Modes in a Nematic Liquid Crystal
We have measured the temperature dependence of the intensity and spectrum of light scattered by fluctuations in the nematic phase of $p$-methoxy-benzylidene $p\ensuremath{-}n$-butylaniline. Our measurements are interpreted using two phenomenological theories of nematic liquid crystals.
Wavelength Modulation Spectrum of Copper
The wavelength modulation spectrum of Cu is presented at 7\ifmmode^\circ\else\textdegree\fi{}K in the range of $2.0<~\ensuremath{\hbar}\ensuremath{\omega}<~6.0$ eV. The band structure of Cu calculated by the empirical pseudopotential method is used to compute the imaginary part of the dielectric function ${\ensu…
Observations of ferroelectric domains in boracites
Ni-Br, Ni-Cl, Mn-Cl, and Zn-Cl boracites have been studied with electron and polarization microscopy. Among others 180° head-head or tail-tail domains are found in the orthorhombic phase of Ni-Br, Ni-Cl, Mn-Cl, and Zn-Cl boracite. They may be due to growth stacking faults on {100} planes. The orientations of strain-fr…
On the physical nature of traps in molecular crystals
The possible physical nature of charge carrier traps of quasi-continuous distribution in molecular crystals is discussed. It is shown that the formation of quasi-continuous trap distribution may be connected with the statistical dispersion of the charge carrier polarization energy caused by fluctuational structural ir…
The rubidium chloride – sodium chloride phase diagram
The phase diagram of the RbCl–NaCl system has been measured by the method of cooling curves. By combining these data with available thermochemical data for the system, the integral molar excess free energy of mixing at 800 °C has been calculated as ΔG E = −632X RbCl X NaCl cal/mole; and the integral molar excess entro…
Magnetostriction of Paramagnetic Transition Metals. II. Group-VIII Metals Ru, Rh, Pd, Ir, Pt, and Their Alloys
The longitudinal magnetostriction of group-VIII transition metals and alloys was measured with a capacitance dilatometer at 4.2 \ifmmode^\circ\else\textdegree\fi{}K in fields up to 100 kOe. The resultant values of the logarithmic volume dependence of the magnetic susceptibility, $\frac{\ensuremath{\partial}\mathrm{ln}…
Many-Electron Theory of Nondirect Transitions in the Optical and Photoemission Spectra of Metals
The theory of the singular readjustment of a conduction band to a hole formed in an x-ray absorption event is extended to the case where the hole has finite mass, as in the $d$ band of Cu. Although the resulting recoil removes the singularity, the effect may still be quite large, and results in an electron-induced Deb…
Hole mobility in Cu2O.I. Scattering by lattice vibrations
The hole mobility in Cu 2 O was measured using guard ring and Hall current techniques over a temperature range of +200 to −125 °C. For samples with highest mobility the temperature dependence was found to be approximately exponential with different activation energy above and below +60 °C. The results are explained on…
Studies on metal hydroxy compounds. XII. Thermal analyses, decomposition kinetics, and infrared spectra of copper basic oxysalts
The thermal analyses of copper basic oxysalts of the type Cu 2 (OH) 2 XO y , where X = S, C, Cl, Br, I, N, HC and y = 4, 3, or 2 reveal that decomposition occurs, in most cases, by dehydroxylation with concomitant disproportionation of the oxysalt. An outstanding exception to this pattern of decomposition is the basic…
Direct Flow Measurement of O2(b1Σg+) Quenching Rates
A relaxation method is developed which permits a direct measurement of O2(b1Σg+) quenching rate constants. An Al wire spiral is used to selectively quench O2(1Σ) which is normally present in discharged oxygen as a steady-state intermediate. The characteristic time for the reestablishment of the O2(1Σ) steady state is…
Anisotropic Heat Conduction in Cubic Crystals in the Boundary Scattering Regime
The thermal conductivities of single crystals of silicon and of calcium fluoride have been measured in the temperature range 3-40 \ifmmode^\circ\else\textdegree\fi{}K and 2.5-30 \ifmmode^\circ\else\textdegree\fi{}K, respectively. For samples in the form of square cross-section rods, the conductivity in the boundary sc…