False set in aireated cements
The influence of aireation on the appearance or elimination of the false setting in industrial portland cements is studied by means of infrared spectroscopy.
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。
New test for determining fundamental transverse, longitudinal and torsional frequencies of concrete specimens
For twenty-five years The ASTM method used to determine reductions in concrete durability after freeze-thaw cycling has been C215-60. In this test the fundamental frequencies of a concrete specimen are compared. This test is time consuming, noisy and often inaccurate. In this paper a new method is proposed for measuri…
Nota Necrológica: Don Pablo
Noticias
Magnetic anisotropy of MnAl and MnAlC permanent magnet materials
The magnetocrystalline anisotropy of MnAl and MnAlC alloys, in the range of existence of the ferromagnetic τ phase, has been studied by using the singular point detection technique. The anisotropy field value at 293 K varies from 39 kOe for low manganese and high carbon content to 55 kOe for high manganese and carbon-…
Helmholtz’s theorem revisited
Helmholtz’s theorem for three-vectors is applicable to electrostatics and magnetostatics, but it must be generalized to antisymmetric second-rank tensors to be applicable to electromagnetism. A proof of Helmholtz’s theorem for three-vectors, which is shorter than the usual one, is given. Helmholtz’s theorem is shown t…
Mass transfer and electrochemical kinetic interactions in localized pitting corrosion
Abstract Identification and characterization of coupled diffusional and electrochemical kinetics effects was achieved under potentiostatic anodic dissolution conditions. A one‐dimensional artificial pit geometry with sample wire electrodes embedded in an inert support exposed to NaCl solutions was used to study the di…
Standard X-Ray Diffraction Powder Patterns from the JCPDS Research Associateship
The following new or updated patterns are submitted by the JCPDS Research Associateship at the National Bureau of Standards. The patterns are a continuation of the series of standard X-ray diffraction powder patterns published previously in the NBS Circular 539, the NBS Monograph 25, and in this journal. The methods o…
Hydroxyl sites in SiO2 glass: a note on infrared and Raman spectra
There is some interest in the speciation of water in silicate glasses and melts, and the effect of bulk composition on this speciation. We have obtained infrared and Raman spectra for Si02-H20 glasses with low (1200 ppm) and high (6.3 wt%) water contents. The lowwater-content glass shows an asymmetric band in the fund…
Thermally conductive polymer compositions
Abstract While polymers are widely used for their excellent insulating properties, there is a growing need for thermally conductive polymer compounds. The thermal conductivity of metal particle, mineral particle, and carbon fiber filled compounds are examined at volume concentrations up to the maximum packing fraction…
Flame‐retardant Finishing of Textiles
The need for flame‐retardant finishing of textiles is examined in the context of the hazards of textile flammability, associated legislation and procedures for assessing textile burning behaviour. The functions of flame‐retardant finishes and durable finishes developed specifically for cellulose, wool and man‐made fib…
Relation Between Structural Disorder and Other Characteristics of Kaolinites and Dickites
Abstract A suite of Georgia kaolinites, ranging from well-ordered to very poorly ordered samples, were studied to explore correlations between degree of structural disorder, geological environment, Fe 3+ content, Fe 3+ electron paramagnetic resonance (EPR) spectrum, and infrared (IR) hydroxyl-stretching band frequenci…
Surface‐enhanced Raman spectroscopy of DNA bases
Abstract A Raman microprobe has been used to measure the surface‐enhanced Raman spectra of adenine, guanine, cytosine and thymine. Comparison of the SERS spectrum with solution spectra shows that some line positions are not influenced by the adsorption process while others show large shifts. In the SERS spectrum new l…
Solidification of an alloy from a cooled boundary
We Present a mathematical model for the region of dendritic or cellular growth which often forms during the solidification of alloys. The model treats the region of mixed phase (solid and liquid) as a continuum whose properties vary with the local volume fraction of solid. It is assumed that transports of heat and of…
Orientational Optical Nonlinearity of Liquid Crystals
As a result of development of optics during many centuries the concept was formed that a medium can strongly influence on the light propagation, but the light itself cannot have backward influence on the medium. That concept was refuted only with appearing of coherent and high power radiation of lasers, see, e.g., Nob…
PHTHALOCYANINES AS PHOTOSENSITIZERS IN BIOLOGICAL SYSTEMS AND FOR THE PHOTODYNAMIC THERAPY OF TUMORS
Photochemistry and PhotobiologyVolume 43, Issue 6 p. 691-699 Free Access PHTHALOCYANINES AS PHOTOSENSITIZERS IN BIOLOGICAL SYSTEMS AND FOR THE PHOTODYNAMIC THERAPY OF TUMORS John D. Spikes, John D. Spikes Department of Biology University of Utah Salt Lake City UT 84112, USASearch for more papers by this author John D.…
An experimental investigation of drop deformation and breakup in steady, two-dimensional linear flows
We consider the deformation and burst of small fluid droplets in steady linear, two-dimensional motions of a second immiscible fluid. Experiments using a computer-controlled, four-roll mill to investigate the effect of flow type are described, and the results compared with predictions of several available asymptotic d…
Electronic wave functions in semiconductor clusters: experiment and theory
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic wave functions in semiconductor clusters: experiment and theoryLouis BrusCite this: J. Phys. Chem. 1986, 90, 12, 2555–2560Publication Date (Print):June 1, 1986Publication History Published online1 May 2002Published inissue 1 June 1986https://pubs.acs.org/doi/10.10…
ChemInform Abstract: Photochemistry and Radiation Chemistry of Colloidal Semiconductors.
Abstract The reactions of OH radicals with Colloidal Q‐CdS, Q‐ZnS, and Q‐Cd3P2 (materials of extremely small particle size showing optical size quantization effects) are studied by pulse radiolysis.
Nickel-zinc microwave ferrite with stress-insensitive square hysteresis loop
By substitution of Mn3+ ions for 0.2 Fe3+ ions per formula unit of dense polycrystalline 5000-G Ni0.65Zn0.35Fe2O4, the hysteresis loop becomes square (remanent magnetization increases by a factor of 2) without deterioration of X-band microwave dielectric properties or significant increase in coercive field. In additio…