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。
Mossbauer spectra on 57Fe and 119Sn in perovskite carbides with formula M3M'C (where M is Fe or Mn, and M', Al, Ga, Ge, Zn, Sn) have been observed. All those compounds are characterized by a large quadrupole coupling amounting to 1.3 mm s-1 and by low internal magnetic fields, around 70 kOe, at M atom. The effect of c…
The changes of the elastic shear moduli C 44 and C'=(C 11 -C 12 )/2 have been measured after electron irradiation of aluminium at 4.5K. Aside from dislocation pinning, a diaelastic effect which is proportional to the radiation-induced defect density has been observed. From these data the diaelastic polarizabilities un…
The paper describes analytical and experimental results for a new method of current harmonic reduction in thyristor converters. The principle of the method is to modify the current waveforms on the d.c. windings of the converter transformer by injecting harmonic currents at a particular frequency. In practice, third h…
Abstract The elongation and orientation of randomly coiled macromolecules in a strained melt or solution reduces their entropy and thus increases the crystallization or melting temperature of the ideal lattice. At any given temperature of experiment this enhances nucleation and crystal growth rate. As a rule, linear p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA New Class of Synthetic Polyelectrolytes. Acidic Polyesters of Phosphoric Acid (Poly(hydroxyalkylene phosphates))K. Kaluzynski, J. Libisowski, and St. PenczekCite this: Macromolecules 1976, 9, 2, 365–367Publication Date (Print):March 1, 1976Publication History Published onl…
The formation of TiO 2 powders by oxygenolysis of TiCI 4 was studied with emphasis on the effects of reaction conditions on the particle size of the products. The particle size of TiO 2 (anatase) decreased with increasing reaction temperature or O 2 concentration and with decreasing TiCI 4 concentration. The results a…
An experimental investigation of the effect of chromium oxide coatings upon the surface flashover of high-density alumina in vacuum is reported. It is shown that such coatings improve the withstand voltage for dc, 60-Hz, and impulse voltages by significant amounts. The coatings are simply applied, effective, and durab…
The luminescence spectrum of MgO:${\mathrm{Cr}}^{3+}$ is characterized by a series of sharp features at around 7000 \AA{} and a broad band which stretches from about 7000 \AA{} to 1 \ensuremath{\mu}m. The nature of the centers responsible for this broadband luminescence is examined by a combination of phase-sensitive…
Abstract The crystal structure of form III of isotactic poly‐1‐butene, (poly(1‐ethylethylene)), has been determined by X‐ray powder diffraction techniques, owing to the impossibility of obtaining fiber spectra on this form. The polymer crystallizes in the orthorhombic system, with lattice dimensions: a = 12,38±0,08 Å;…
Abstract A study has been made on the effects of molecular weight on the physical and mechanical properties of cold‐extruded high density polyethylene. Prior data indicate that such ultra‐drawn strands contain a significant fraction of extended‐chain crystals. Four samples, spanning the molecular weight range of 59,00…
To determine quantum efficiencies of powder phosphors as a function of exciting wavelength, sodium salicylate is usable in the ultraviolet but not in the visible region. As a powder standard in the excitation region, 200–550 nm red luminescent lumogen powder is proposed. The absolute quantum efficiency has been measur…
Abstract Calculations are done for a series of mathematical models for a monolith catalytic converter to oxidize carbon monoxide in automobile exhaust. Phenomena studied include axial conduction in the wall, diffusion and conduction in the gas in a transverse direction perpendicular to the flow direction, multiple ste…
Abstract Circular dichroism spectra for acid‐soluble calfskin collagen, gelatin, and poly(proline) II in solution have been extended into the vacuum ultraviolet region. The extended spectrum of gelatin reveals that the circular dichroism of this unordered polymer is more closely related to the spectrum of charged poly…
The structural relaxation spectra of (Pd0.6Ni0.4) 0.80P0.20 and Pd0.775Cu0.06Si0.165 metallic glasses have been obtained with a differential scanning calorimeter. The relaxation spectrum exhibits two distinguishable broad features: a low and high activation energy spectrum. The low activation energy spectrum peaks at…
The steady-state diffusion of radiation-produced point defects in the stress field of an edge dislocation is solved by a perturbation method. The drift term entering the diffusion equation includes the size interaction and the inhomogeneity interaction as well as the effects of externally applied loads. By comparing t…
A method is introduced for the determination of the sparkover voltage of practically any configuration subjected to switching impulses of any polarity, applied to one or more electrodes When the discharge process is governed by the phenomena occurring at a positively charged electrode. The method is applied to some co…
The effect of nonpolymer-forming plasma (e.g., plasma of hydrogen, helium, argon, nitrogen) can be viewed as the following two reactions: 1) reaction of active species with polymer, and 2) formation of free radicals in polymer which is mainly due to the UV emitted by the plasma. The incorporation of nitrogen into the…
The solid solutions exhibit high ionic conduction due to the migration of O 2− ions via oxygen ion vacancies. The emf of a galvanic cell, , is measured within the temperature range between 700° and 800°C as a function of . At such high oxygen pressures as in air, the emf changes according to indicating the ionic trans…
Not available
Not available