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。
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
Not available
Not available
Not available
Not available
Not available
We point out the advantages of the use of x-ray resist as the recording medium in contact x-ray micrography, with subsequent viewing under the scanning electron microscope. Untreated specimens may be replicated with a resolution better than 100 nm. Photographs of latex spheres obtained by this technique are presented.