Materials Literature
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。
The ability of thermoelectric power measurements to permit a description of carrier-density and phonon-drag variations caused by photoexcitation was tested in 100-Ω·cm n- and p-type silicon. At low temperatures the major effect of photexcitation is to decrease the phonon-drag contribution to the thermoelectric power b…
Existing data an dimensional changes in graphite have been fitted to parabolic temperature-sensitive curves. From these, the graphite life, radiation-induced stresses, and permissible geometries have been calculated. It is concluded existing materials can be utilized in a molten-salt reactor which has a core graphite…
Wavelength discrimination was measured from 480 to 660 nm using wavelength-modulated square-wave gratings. When adjacent grating bars are matched in brightness, wavelength-difference thresholds in all regions of the spectrum increase with spatial frequency within the range of 2.4–19.9 cycles per degree (cpd). Unlike l…
A vibrational analysis was performed for fused silica assuming short‐range order in the glassy network. This order is described by an average structural unit based on the model α‐quartz. The analysis uses a group theoretical method and the Wilson FG‐matrix techniques to predict 16 normal mode vibrational frequencies b…
Human serum and plasma have been shown to abolish the pyrogenicity of poly I:poly C. Chicken serum and, to a lesser extent, fetal calf serum also possess this inhibitory effect, while serums of six other animal species do not alter the pyrogenic properties of this compound. The inhibitory effects are time- and tempera…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of Calcium Sulfate Scale Deposition on Heat Transfer SurfacesDavid Hasson and Joseph ZahaviCite this: Ind. Eng. Chem. Fundamen. 1970, 9, 1, 1–10Publication Date (Print):February 1, 1970Publication History Published online1 May 2002Published inissue 1 February 1970h…
Abstract A stable free radical, 2,4,5-triphenylimidazolyl, which was produced by oxidation of 2,4,5-triphenylimidazole, dimerizes to yield two dimers, a photochromic dimer and a piezochromic dimer. The photochromic dimer shows thermochromism and photochromism at temperatures between −196°C and about 200°C both in solu…
Ion-chamber measurements of the photoionization produced by point-to-plane corona discharges in air, oxygen, and nitrogen (commerical grade) over a pressure range of 0.1 to 18 Torr are reported in this paper. The results are expressed in a generalized form that reduces the data for each gas to a single curve relating…
Abstract An x‐ray diffraction method for the simultaneous determination of crystallinity (including intracrystalline defects), effective Debye‐Waller factors, and atomic positions has been developed and applied to semicrystalline polyethylene. It was found that this material unambiguously constitutes a two‐phase syste…
An assessment is made of the relative contributions of mechanical and sonochemical effects to damage suffered by mammalian cells when sonicated in aqueous-suspension culture. In a 1-MHz progressive wave beam, under conditions providing stabilization of the cavitation field, the intensity threshold and intensity optimu…
A careful study of the dispersion of the transverse acoustic phonons and the low-frequency transverse optic phonons in KTa${\mathrm{O}}_{3}$ has been carried out by inelastic neutron scattering. In addition to the well-known temperature dependence of the optic-mode frequencies, both the acoustic-phonon frequencies and…
Using a perturbation expansion based on a strong cubic-field zeroth-order approximation, we have obtained analytical expressions for the $g$ values of the ${{t}_{2}}^{3}$, $^{4}A_{2}$, and $^{2}F$ terms for ${d}^{3}$ impurity ions in trigonal crystal fields. We have compared these expressions whth the results of a num…
As a first stage in a study of the low-temperature-region behavior of aqueous solutions, the composition regions of a large number of binary salt-water systems in which macroscopic samples can be obtained in the vitreous state have been determined. The glass transition temperatures Tg within these regions have also be…
The role of the chloride ion in iron corrosion is assessed from the viewpoint of developing the concept that would lead to a general explanation. The experimental observations relating to such factors as the oxygen effect, concentration, cation, temperature, and pH dependence are reviewed. Some of the observations on…
The structure trend that is observed across the transition metal series as the number of valence electrons N increases 3 to 11 is explained quantitatively. The difference in the total one-electron band structure energy between the close-packed structures face-centred cubic and hexagonal close-packed is shown to determ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface and interfacial tensions of polymer melts. II. Poly(methyl methacrylate), poly(n-butyl methacrylate), and polystyreneSouheng WuCite this: J. Phys. Chem. 1970, 74, 3, 632–638Publication Date (Print):February 1, 1970Publication History Published online1 May 2002Publish…
It is pointed out that the spectra of X-ray induced fast photoelectrons from metal should have a characteristic skew line shape resulting from Kondo-like many-electron interactions of the metallic conduction electrons with the accompanying deep hole in the final state. The same line shape should also occur for the dis…
Many two-phase alloys work-harden much faster than do pure single crystals. This is because the two phases are not equally easy to deform. One component (often dispersed as small particles) deforms less than the other, or not at all, so that gradients of deformation form with a wavelength equal to the spacing between…
Abstract A study was made of adsorption of n-dotriacontane and n-butanol dissolved in n-heptane onto graphitized carbon black and various ground graphites having surface areas ranging from 5 to 700 m2 g-1. It was established that the adsorption of n-dotriacontane by the graphites is confined entirely to the basal plan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReduced nicotinamide adenine dinucleotide phosphate dependent biliverdin reductase. Partial purification and characterizationRaimo Tenhunen, Michael E. Ross, Harvey S. Marver, and Rudi SchmidCite this: Biochemistry 1970, 9, 2, 298–303Publication Date (Print):January 20, 1970…