Nuevo método de análisis de compactación de suelos
Not available
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。
La porosidad de los hormigones y su impermeabilización por medio de resinas sintéticas
Not available
Límites de compactación y compacidad relativa de suelos
Not available
Bibliography
Sobre la determinación de la calidad de las escorias de horno alto y de las puzolanas
Not available
Método complexométrico para el análisis rápido del cemento portland
Not available
Adamantane: Consequences of the Diamondoid Structure
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdamantane: Consequences of the Diamondoid StructureRaymond C. Fort and Paul von R. SchleyerCite this: Chem. Rev. 1964, 64, 3, 277–300Publication Date (Print):June 1, 1964Publication History Published online1 May 2002Published inissue 1 June 1964https://pubs.acs.org/doi/10.1…
Catastrophic Thermoplastic Shear
Dynamic plastic behavior of materials is influenced by internally generated temperature gradients. These gradients are a function of thermophysical properties as well as strain rate and shear strength. Criteria are presented for the prediction of catastrophic shear in materials. Catastrophic shear occurs when the loca…
On the interior morphology of bulk polyethylene
Abstract The internal crystalline morphology of linear polyethylenes was examined by utilising the P ALMER ‐C OBBOLD nitric acid digestion treatment. The basically lamellar morphology reported by P ALMER and C OBBOLD was confirmed in all the cases investigated which includes extreme differences in crystallization cond…
The texture of melt crystallised polythene as revealed by selective oxidation
Abstract It has been discovered that when fuming nitric acid oxidises bulk samples of polythene crystallised from the melt, preferential attack on the links between the lamellar crystals occurs with the consequent release of fragments of these crystals. The reaction is not confined to the surface of samples and lamell…
Site of Preference Energy and Selective Uptake of Transition-Metal Ions from a Magma
Results of absorption spectra measurements on silicate glasses of various compositions indicate that ions of the first transition-metal series are present in tetrahedral and octahedral sites in silicate melts (glasses). The fractionation patterns observed for transition-metal ions between magmas and silicate minerals…
Ein synthetischer Zugang zum Corrinsystem
Am Beispiel der Synthese des Nickel(II)-Komplexes des (±)-1.8.8.13.13-Pentamethyl-trans-corrins wird ein synthetischer Zugang zum Verbindungstyp der Corrine aufgezeigt. Durch die mehrfache Verwendung des Triäthyloxonium-tetrafluorborats bietet die Arbeit eine Illustration der präparativen Bedeutung der von H. Meerwein…
Theory of Electron Backscattering
An exact integral equation is derived for the backscattering coefficient as a function of energy and angle. The equation has an approximate symmetry which allows one to determine the conditions under which backscattering will be independent of the energy of the incident electrons. The validity of some approximations i…
K-Shell Photoelectric Cross Sections from 200 keV to 2 MeV
A numerical program has been developed for the calculation of atomic photoelectric differential and total cross sections, including all polarization correlations. The program is designed to calculate relativistic Coulomb wave functions in a screened central potential; the outgoing continuum wave function is obtained i…
Effect of Correlation on the Ferromagnetism of Transition Metals
The wave function for the electrons is investigated when a set of narrow bands (valence states) has its energies within a wide band (conduction states). The valence states are linear combinations of localized states which are attached to each lattice site. The intra-atomic Coulomb and exchange integrals for the locali…
Thermal Conductivity of Silicon and Germanium from 3°K to the Melting Point
The thermal conductivity $K$ of single crystals of silicon has been measured from 3 to 1580\ifmmode^\circ\else\textdegree\fi{}K and of single crystals of germanium from 3 to 1190\ifmmode^\circ\else\textdegree\fi{}K. These measurements have been made using a steady-state, radial heat flow apparatus for $T>300\ifmmod…
Nuclear Magnetic Resonance in Molten Salts. I. Chemical Shift of Crystalline and Molten Thallium Salts
Relatively large chemical shifts in the resonance frequency of the thallium nucleus are observed in both the crystalline and molten states of different thallium salts. Relative to TlNO3, which appears to be the most ionic of all thallium salts studied, the 205Tl resonance frequency at fixed field increases in the orde…
Fluorescence and Energy Transfer in Y2O3:Eu3+
Experimental evidence for nonradiative resonant energy transfer between Eu3+ and other trivalent rare-earth ions in Y2O3 is presented and possible interaction mechanisms are examined. It is concluded that coupling via overlap of near zone quadrupolar fields is important. Measurements on the transient behavior of the E…
Natural Expansion of the First-Order Density Matrix for a Spin-Projected Single Determinant
The first-order density matrix is obtained for the state corresponding to a spin projection of a general different orbitals for different spins single determinental function. Explicit expressions are given for the natural orbitals and occupation numbers in terms of parameters characteristic of the unprojected state. T…
Semiconducting Organic Polymers Derived from Nitriles. Thermoelectric Power and Thermal Conductivity Measurements
The thermal conductivities and thermoelectric powers of two previously reported polymeric organic semiconductive materials are reported. One system, thought to be a form of oxidized polyphthalocyanine, shows very complex behavior on heating in the presence of oxygen. The thermoelectric power is very sensitive to this…