Chemical and mineralogical composition of the powder in cement kilns
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Materials Literature
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Influence of revibration on the properties of hardened cement pastes and concretes
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The influence of structural changes on the vitrous phase of white Portland cement and on its white content
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Electrocaloric Effects in Some Ferroelectric and Antiferroelectric Pb(Zr, Ti)O3 Compounds
Variations of sample temperature arising from the electrocaloric effect, antiferroelectric to ferroelectric transitions, and hysteresis-loss heating have been recorded together with the hysteresis loops for four different ceramic ferroelectrics near room temperature. Both the electric-field dependence and the temperat…
The Degradation of Poly(ethylene terephthalate)
Abstract The penetration of new markets by polyester fibers has emphasized the need for increased stability of the polyester toward a variety of degradative reactions. Extensive studies of the nature of the thermal, hydrolytic, oxidative, and radiation‐induced degradation reactions have been reported. The interpretati…
Comparison of kinetic and diffusional models for solid‐gas reactions
Abstract A comparison of the kinetic and diffusional models for solid‐gas reactions occurring in a spherical particle is presented. The similarities and differences of the unreacted‐core shrinking model and the homogeneous model are examined in light of the rate‐controlling factors. In view of the similarity of the tw…
Raman Spectrum of Strontium Titanate
The Raman spectrum of single-crystal SrTiO3 has been investigated as a function of temperature down to about 25°K. The lattice dynamics of this crystal have been extensively studied in recent years primarily because of its unusual dielectric and acoustic properties. Both nominally pure and impure samples were examined…
Molybdovanadophosphoric acids and their salts. I. Investigation of methods of preparation and characterization
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolybdovanadophosphoric acids and their salts. I. Investigation of methods of preparation and characterizationGeorge A. Tsigdinos and Calvin J. HalladaCite this: Inorg. Chem. 1968, 7, 3, 437–441Publication Date (Print):March 1, 1968Publication History Published online1 May 2…
X-ray scattering factors computed from numerical Hartree–Fock wave functions
X-ray scattering factors for neutral atoms from He to Lw and for most of the chemically significant ions through Lu3+ have been computed from numerical Hartree–Fock wave functions. The results are given in the form of coefficients for an analytic function.
Infrared Spectra of Steroids
CONTENTS I. Features of the chemical structure of steroids 155 II. Correlation of the infrared spectra of steroids with their structure 156 III. Use of infrared spectroscopy in steroid chemistry 164
The Masking of Reactions
CONTENTS I. Introduction 142 II. Classification of masking processes 143 III. Methods for calculating the efficiency of masking 144 IV. Masking and the selectivity of reactions 148 V. The most common masking agents 149 VI. Characteristic examples of the practical application of masking 153
Morphometric Variation and Function in the Baculum, with Comments on Correlation of Parts
Probable functions of the baculum are reviewed. Consideration of vectors of resistance of the vaginal orifice and of forces of the baculum reveals possible reasons for the specialization of the bacular tip in some carnivores and rodents. Coefficients of variation of length and some other measurements of some bacula of…
NMR Studies of Diffusion in Glassy and Crystalline Lithium Borates
The 7Li NMR spectra from several lithium borate glasses have been examined as a function of temperature and found to narrow abruptly with increasing temperature in the range of temperatures from 250° to 475°K. The observed narrowing is a manifestation of the phenomenon of motional narrowing, and is attributed to diffu…
Crystal structure of β-Cu2P2O7
The crystal structure of β-CU 2 P 2 O 7 has been determined by X-ray methods. The crystals are monoclinic with a = 6.827(8) Å, b = 8.118(10) Å, c = 4.576(6) Å, β = 108.85(10)°, Z = 2, and space group C2/m. This structure is analogous to that of the mineral thortveitite and the high temperature forms of the pyrophospha…
Optical Properties of Alkali-Halide Crystals
Reflectivity data from single crystals of alkali halides have been obtained in the ultraviolet region of the spectrum where excitonic and low interband transitions occur. Following recent calculations for the band structure of KC1 and KI and basing our analysis on the experimental data, it has been possible to predict…
Multipacting Discharges between Coaxial Electrodes
Experimental evidence is presented to demonstrate the scaling relations of the similarity principle for multipacting as applied to coaxial electrodes with b/a (b and a are the radii of the outer and inner electrodes, respectively) varying between 2.3 and 18.26. The two field configurations considered are: (1) rf volta…
Thermopower in Thin-Film Copper—Constantan Couples
The thickness dependence of the thermal emf of thin-film copper—constantan thermocouples at room temperature and above shows nearly bulklike behavior when the thickness of both elements comprising the thermocouple is greater than ∼1200 Å. The thermal response time of the thermocouples as measured with a pulsed laser b…
Temperature Dependence of Dispersed Barrier Hardening
This paper examines the temperature dependence predicted by theories of dispersed barrier hardening. Most of interaction potentials employed in the theories are similar. It is not possible to select one of several interaction potentials on the basis of an experimentally obtained stress-temperature relationship. This p…
Diffraction Pattern and Structure of Liquid Benzene
The scattering of x rays from the free surface of liquid benzene has been analyzed at 25°C. The diffractometer used was specially designed for the study of liquid structure. Intensity and radial distribution functions have been computed for a model structure and compared to those derived from experiment. The model ass…
Magnetic and Crystallographic Properties of Some Rare Earth Cobalt Compounds with CaZn5 Structure
The magnetic and crystallographic properties of CaZn5-type intermetallic compounds of cobalt and rare-earth elements (including Th) have been investigated. Strong deviations from 1:5 stoichiometry are observed when the rare-earth radius becomes relatively small. Both the saturation magnetizations (4πIs=2360–12 300 G)…