Some remarks on the presence of metallic sulphurs in aggregates
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。
Study of transformations of hydrated high alumina cement by means of ray diffraction, infrared spectroscopy and thermal analysis. Influence of carbon anhydride, temperature, humidity and the addition of powdered limestone (continuation)
Not available
Components conditioning hydraulic cements
Not available
Testing procedure to determine the dissecation aptitude of clay masses (H2T 1/75c)
Not available
Extracts from technical journals
Cement Meeting of the II General IETcc Assembly
Not available
Grain boundary contribution to the electrical conductivity of polycrystalline Cu films
Cu films of 1000 AA were grown at various substrate temperatures with increasing grain sizes at 10-5 Torr. The grain boundary resistivity ( rho gb=3.58*10-12 Omega cm2) and reflection coefficient (R=0.2635) at room temperature (22 degrees C) remained almost the same for different grain sizes, suggesting that the poten…
Contribution to the determination of gypsum and hemihydrates content in Portland cements
Not available
Model for the bleaching of WO3 electrochromic films by an electric field
Measurements have been made of the current flow in amorphous WO3 films containing electrons and mobile cations. In a configuration in which electrons are extracted at one contact and cations at the other, the current decays as t−3/4 over many decades of time. By using space-charge current flow ideas, we develop a theo…
Dynamic behavior of twisted nematic liquid-crystal layers in switched fields
The Ericksen-Leslie equations, describing the dynamic behavior of nematic liquid crystals, have been applied to a twisted nematic layer and have been numerically solved for a number of cases. The results account well for the observed dynamic behavior of displays using a twisted nematic layer. In particular, an explana…
Thermodynamics and Crystallization of Random Copolymers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics and Crystallization of Random CopolymersI. C. Sanchez and R. K. EbyCite this: Macromolecules 1975, 8, 5, 638–641Publication Date (Print):September 1, 1975Publication History Published online1 May 2002Published inissue 1 September 1975https://pubs.acs.org/doi/1…
CONTINUOUS SILICON CARBIDE FIBER OF HIGH TENSILE STRENGTH
Abstract Continuous silicon carbide fiber of high-tensile strength (about 350 Kg/mm2) was synthesized by means of the heat-treatment of organosilicon polymer obtained from dodecamethylcyclohexasilane. X-ray analysis and high voltage electron microscopic observations revealed that the obtained continuous fiber is an ul…
Tunnel effects in polyatomic systems with electronic degeneracy and pseudodegeneracy
We consider phenomena which are frequently designated jointly as the Jahn-Teller effect and result from dynamic electron-vibrational (vibronic) coupling in polyatomic systems with degenerate and pseudodegenerate terms. Principal attention is paid to the case of strong coupling, when the adiabatic potential in the spac…
Stimulated emission from Er3+ions in yttrium aluminum garnet crystals at λ = 2.94 μ
Stimulated emission due to the 4 I 11/2 – 4 I 13/2 transition (λ = 2.936 μ) in yttrium aluminum garnet (Y 3 Al 5 O 12 ) doped with Er 3+ ions (30 wt%) was observed for the first time at 300°K. The output energy from crystals of 50 × 3 mm dimensions was 0.3 J under free-oscillation conditions and 0.05 J in the case of…
K X-ray emission spectra of Mg and Al
Relative energies and relative intensities of the K alpha satellites and the K beta bands of Mg and Al metals and anodized Al have been measured. Spectra were obtained with a PAX spectrometer which provided high resolution and accurate intensity data (PAX identical to photoelectron spectrometry for the analysis of X-r…
A direct method for the calculation of the edge capacitance of thick electrodes
A new method is presented for the evaluation of the edge-capacitance correction for electrodes of finite thickness. The corrections are divided into three separate components: electrode thickness, the lower edge of the electrodes, and the back of the electrodes. Simple correction formulae are derived for the first two…
The use of the Peltier effect for simple and accurate calibration of thermoelectric devices
Abstract A method is described whereby absolute values for the Seebeck coefficient, the thermal conductance and the thermal capacity of thermoelectric devices may be obtained without the need to measure temperature differences or heat flows. The only requirement in addition to the device to be calibrated and its usual…
X-Ray-Diffuse-Scattering Evidence for a Phase Transition in Tetrathiafulvalene Tetracyanoquinodimethane (TTF-TCNQ)
X-ray-diffuse-scattering measurements of tetrathiafulvalene tetracyanoquinodimethane (TTF-TCNQ) show structural evidence of a phase transition. The low-temperature three dimensional superlattice ($2a\ifmmode\times\else\texttimes\fi{}3.7b\ifmmode\times\else\texttimes\fi{}\mathrm{Xc}$) is found to be preceded above 40 K…
Strain rate sensitivity and the portevin-le chatelier effect in Au–Cu alloys
The effect of strain rate changes on the flow stress of Au–Cu alloys in the region of strain prior to the start of serrated yielding has been investigated. The measurements of Δσ/Δ Δσ/Δ were found to depend on strain, strain rate, temperature, and composition. Negative values of Δσ/Δ ln ϵ were observed prior to the on…
New oscillation phenomena in VO2 crystals
New oscillation phenomena in VO2 crystals were observed. The oscillation is generated in the temperature region of the crystal transition, and its voltage and frequency depend upon the ambient temperature. The waveform of the oscillation is a rectangular pulse.