Initial calculation of the compression strength of concrete from the compression strength of normalized cement mortar, according to DIN 1 164 E (ISO test method)
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Core-electron binding energies for compounds of boron, carbon, and chromium
Boron 1~ and chromium 3E binding energies have been measured for 25 boron compounds and 17 chromium compounds.The data correlate linearly with calculated atomic charges.A linear correlation is also demonstrated for CNDO~calculated atomic charges and carbon 1~ binding energies determined by other workers.
Thermal properties of concrete at elevated temperatures
The practice of regarding the thermal properties of concrete as constants may lead to serious errors in heat flow calculations. Because of the physicochemical instability of concrete it is very difficult to procure valid experimental information. In this paper theoretical considerations are presented which, together w…
Exchangeable Aluminum As a Criterion for Liming Leached Mineral Soils
Abstract Lime rates equivalent to the amount of exchangeable Al reacted primarily with the exchangeable Al and reduced the Al saturation of the effective CEC to less than 30%. Lime rates greater than the equivalent amount of exchangeable Al resulted in appreciable amounts of nonexcharigeable acidity being neutralized.…
Ring Closure and Local Conformational Deformations of Chain Molecules
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRing Closure and Local Conformational Deformations of Chain MoleculesNobuhiro Go¯ and Harold A. ScheragaCite this: Macromolecules 1970, 3, 2, 178–187Publication Date (Print):March 1, 1970Publication History Published online1 May 2002Published inissue 1 March 1970https://pubs…
Rheological Properties of Anionic Polystyrenes. I. Dynamic Viscoelasticity of Narrow-Distribution Polystyrenes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRheological Properties of Anionic Polystyrenes. I. Dynamic Viscoelasticity of Narrow-Distribution PolystyrenesShigehara Onogi, Toshiro Masuda, and Keishi KitagawaCite this: Macromolecules 1970, 3, 2, 109–116Publication Date (Print):March 1, 1970Publication History Published…
Polymerisation of Allyl Compounds
The review deals with the advances in the theory of the formation of allyl polymers and their practical applications. Until recently there was only limited interest in allyl polymers because with the usual free-radical initiation allyl compounds polymerise with difficulty and yield polymers with a low molecular weight…
Influence of Interactions Between Impurities on the Appearance of Magnetic Moments in Copper-Cobalt Dilute Alloys
A simple model is used to describe the magnetic properties of cobalt impurities in copper. Isolated impurities are nonmagnetic with a high spin-fluctuation temperature. Isolated pairs of neighbor cobalt atoms are very nearly magnetic: This gives rise to a large susceptibility and a large electronic specific heat, vary…
Biaxial Liquid Crystals
Convergent light observations have been made on three liquid crystalline substances with nematic and smectic phases. The nematic phase was observed to be uniaxial as expected, but smectic $C$ was found to be biaxial. The optic axial angle $2V$ for smectic $C$ was found to be on the order of 20\ifmmode^\circ\else\textd…
Electron Population Parameters from Least-Squares Refinement of X-ray Diffraction Data
A least-squares refinement of x-ray diffraction data has been developed in which the parameters are the populations of atomic orbital products describing the molecular electron density distribution. The procedure is applied to alpha-oxalic acid dihydrate and cyanuric acid. Complementary structural information obtained…
On the mechanism of the alternate copolymerization of phenyl isocyanate with ethylene oxide
Abstract The mechanism of the alternate copolymerization of phenyl isocyanate with ethylene oxide was investigated. Several experimental results show that this copolymerization proceeds according to an anionic coordinated mechanism. As for alternate copolymerization three mechanisms are generally considerable as follo…
Luminescence in the alkali metavanadates
The luminescence efficiency of the alkali metavanadates has been reported to increase by several orders of magnitude in the cation series from Na to K to Rb to Cs. Measurements of luminescence efficiency and decay time as a function of temperature show that maxima occur in the luminescence efficiency at 300, 200, and…
Observation of Surface Bound State and Two-Dimensional Energy Band by Electron Tunneling
Using electron tunneling, we have made direct observation of a surface bound state of electrons localized in a narrow accumulation layer at the InAs-oxide interface. The Landau-level structure of the two-dimensional energy band, associated with the bound state, has been studied in a magnetic field up to 85 kG.
Azbel'-Kaner Cyclotron Resonance in Arsenic
Azbel'-Kaner cyclotron resonance has been studied in arsenic at a frequency of 134 GHz. Cyclotron effective masses have been measured for magnetic field directions in the three principal crystallographic planes. The results are in general accord with the Fermi surface deduced from other experiments and from band-struc…
Magnetization Process and Spin-Structure Diagram in Manganese Phosphide Single Crystal
Magnetizations in the three main planes of a single crystal of manganese phosphide are measured at 4.2°K. Especially the b -axis magnetizations are studied in detail in the range of magnetic field up to 80 kOe at various temperatures. The screw-spin state of ferromagnetic spin state transforms to the state and than to…
On New Ferromagnetic Intermetallic Compounds PtMnSn and PtMnSb
Crystal structures and magnetic properties of Pt-Mn-Sn and Pt-Mn-Sb alloys have been investigated by means of X-ray analysis, magnetic analysis and nuclear magnetic resonance. It is found that the alloys with the stoichiometric compositions PtMnSn and PtMnSb are ferromagnetic and that the former has a structure of the…
Recombination Kinetics of Excitonic Molecules and Free Excitons in Intrinsic Silicon
Time-resolved spectra and luminescence decay-time measurements prove that at 1.8\ifmmode^\circ\else\textdegree\fi{}K the excitonic-molecule (EM) and free-exciton (FE) densities decay at different rates in pure silicon. The decay profile of the EM shows a postexcitation increase in luminesence followed by an approximat…
Statistical Mechanics of Rodlike Particles. II. A Scaled Particle Investigation of the Aligned→Isotropic Transition in a Fluid of Rigid Spherocylinders
Expressions for the equation of state and the chemical potential are derived as functions of density and temperature for both a perfectly aligned and a completely isotropic fluid of rigid spherocylinders through consideration of the reversible work W(α, λ, ρ) necessary to add a scaled spherocylinder of radius α and cy…
Auger-Electron Spectroscopy of Transition Metals
The Auger-electron spectra in the intermediate- and low-energy range (0-1 keV) for many of the transition metals of periods 4-6 (specifically, Sc, Ti, V, Cr, Fe, Co, Y, Zr, Nb, Mo, Ru, Rh, La, Hf, Ta, W, Re, Ir, Pt, and Au) have been measured. In general, the spectra from elements in the same period of the Periodic Ta…
Infrared Reflection Spectra ofGa1−xAlxAsMixed Crystals
The infrared lattice-vibration spectra of ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Al}}_{x}\mathrm{As}$ mixed crystals have been studied by measuring the room-temperature reflectivity at near-normal incidence in the 200-600-${\mathrm{cm}}^{\ensuremath{-}1}$ frequency range. Two distinct reststrahlen bands with freque…