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 Analysis is made of the asymmetry of the carbonyl stretching vibration of poly(ethylene terephthalate) and poly(propylene terephthalate) as a function of annealing frrom amorphous to crystalline polymer. An apparently anomalous behavior of carbonyl band half‐width as a function of density for PPT is shown to…
Abstract Bispyridylnorbornadienes were synthesized using the Diels–Alder reaction of HBF4 salts of bispyridylacetylenes with cyclopentadiene. They underwent the photocyclization to give quadricyclanes which reverted to norbornadienes by heating or a catalyst. Bis(N-methylpyridyl)norbornadienes were also synthesized an…
Not only the size of the anions but also their “Pearson softness” is decisive for determining which structures (ET) 2 X radical‐cation salts form. Exchange of the anion in superconducting, two‐dimensional β‐(ET) 2 AuI 2 for Au(CN) or AuBr leads to quasi one‐dimensional twist structures with ET double bonds and two‐dim…
The temperature variation of the lattice parameters of orthorhombic sulfur was determined in the range 100 to 300 K using X-ray powder diffractometry. The following equations represent the results: aT = 10.3506−2.962 × 10−4T + 2.346 × 10−6T2 Å bT = 12.8518 − 1.198 × 10−3T + 4.038 × 10−6T2 Å cT = 24.1986 + 7.952 × 10−4…
Melting experiments were performed encompassing both pure and impure substances. The pure substances included n-octadecane paraffin and n-eicosane paraffin, while the impure substances were mixtures synthesized from the pure paraffins. The experiments were carried out in a closed vertical tube whose wall was subjected…
The paper discusses the application of signal processing techniques in the interpretation of partial discharge (PD) pulses as detected at the terminals of power transformers. Special consideration is given to the concept of PD energy and to the effect of waveshapes. Examples are included of FFT analyses of PD waves as…
A new species Stephanodiscus vestibulis is described from an eutrophic, hardwater habitat in western North America. Under the light microscope it resembles, and has perhaps been confused with, certain other small species of the genus. Structural features of the valve resolved by SEM, however, show that it is unique. T…
Pure 2-keto-4-hydroxyglutarate aldolase of Escherichia coli, a "lysine-type" trimeric enzyme which has the unique properties of forming an "abortive" Schiff-base intermediate with glyoxylate (the aldehydic product/substrate) and of showing strong beta-decarboxylase activity toward oxalacetate, binds any one of its sub…
The THERMIX-KONVEK code was used to model the steady state and dynamic thermal behavior of the US pebble bed modular HTR concept and trial calculations for accident conditions were performed. Results of these trial calculations are compared with other predictions by ORNL and by industrial proponents. The basic equatio…
The oxidation of the (111) surface of crystalline UO2 through U3O7 to U3O8 has been studied by X-ray photoelectron spectroscopy and X-ray diffraction. Anisotropic growth of U3O8 revealed an epitaxial relationship between the cubic close-packed (111) plane of fluorite UO2 and the (001) basal plane of orthorhombic U3O8.…
The proportion of types I and III intramuscular collagen in longissimus muscles of Simmental bulls (n = 8) and steers (n = 8) 17 mo of age was studied. Longissimus samples taken 7 d after slaughter were evaluated for total collagen, types I and III collagen, heat-soluble collagen, sensory panel traits and Warner-Bratz…
Abstract Stoichiometric and nonstoichiometric polyion complex films were prepared from poly(sodium p ‐styrene sulfonate) and poly(diallyl dimethyl ammonium chloride). X‐ray photoelectron spectroscopy revealed that the ionic groups in the complex are more ionized than in each component polymer. Fluorescence measurement…
Abstract A systematic, experimental study was conducted on the elementary process of devolatilization (DV) and the various parameters affecting it, using a specially designed apparatus, which is devoid of the flow complexities present in industrial equipment and which permits independent control of all pertinent param…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe multiply bonded octahalodiosmate(III) anions. 2. Structure and bondingPradyot A. Agaskar, F. Albert. Cotton, Kim R. Dunbar, Larry R. Falvello, Stephen M. Tetrick, and Richard A. WaltonCite this: J. Am. Chem. Soc. 1986, 108, 16, 4850–4855Publication Date (Print):August 1,…
Abstract The depth distribution of illite/smectite (I/S) compositions was investigated for a well drilled to a depth of 3462 m on Barbados Island, the only subaerial exposure of the Barbados accretionary complex. The classical pattern of increasing percentage of illite interlayers in the mixed-layer clay with increasi…
Long-term cathodic polarization studies performed on selected marine alloys in natural seawater indicated lower than expected limiting current densities (CDs) at large electronegative potentials. The decay in the CDs appears to be related to the growth of a calcareous film that, when taken into account in modified mas…
A model of the fragmentation process is developed, based on the theory of linear elastic fracture mechanics, which predicts the average fragment size as a function of strain rate and material properties. This approach permits a unification of previous results, yielding Griffith’s solution in the low-strain-rate limit…
Thermodynamically, the oxygen potential of pure steam increases as the pressure increases. As a result, high-pressure steam can produce more highly oxidized urania than can steam at atmospheric pressure. Oxygen-to-uranium ratios as high as 2.60 can theoretically be attained in steam at 150 atm and temperatures near 16…
In-situ heating of the icosahedral phase in (Al6Mn)1−xSix, x = 0·02 and 0·04, in a Philips EM420 electron microscope leads to the formation of α(AlMnSi) and Al6Mn crystalline phases. The orientation relationship between the icosahedral phase and the α phase is found to be as suggested by Guyot and Audier, and Elser an…
The alkali metal thermoelectric converter is a direct energy conversion device, utilizing a high alkali metal activity gradient to generate electrical power. Its operation is based on the unique ion conductive properties of beta″‐alumina solid electrolyte. The major barrier to application of this device is identificat…