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 IR spectroscopy is utilized to analyse the mixed crystal system of AgNO 3 and Sr(NO 3 ) 2 in the ordered phase II and disordered phases of silver nitrate. The study aims mainly to clearify the change and the affect of partial replacement of Ag + ion by Sr ++ ion in the mixed crystal system of the two metal ni…
L'oxydation du carbure d'aluminium pulvérulent dans l'oxygène est gouvernée par un mécanisme complexe. Aux basses températures, et au début de la réaction à toute température comprise entre 880°C et 1250°C, il s'agit d'un mécanisme en parallèle de diffusion et de réaction, le second étant beaucoup plus rapide que le p…
The corrosion resistance and weld hot cracking of high silicon containing stainless steels were investigated from a metallurgical point of view. A stainless steel has good corrosion resistance due to the passive film. However the stainless steels differ from the intergranular corrosion in the high potential region, fo…
A simple flow-system was designed to study the dissolution of cobaltous oxide (CoO) at surface conditions (25° and 39°C, one atmosphere). Experiments were carried out using solutions with salinities less than 0.01m and pH's of 0.7-3.46. The dissolution was found to be controlled by surface reactions and has a reaction…
The electrical resistivity and magnetization of Ni-base alloys containing Zn up to 25 at% were respectively measured between 4.2 and 1000 K and at 77 K. With increasing Zn content, the magnetic contribution to the resistivity slightly increases and has a broad maximum at 8–16 at% Zn, notwithstanding the linear decreas…
This paper presents a study on the effect of intergranular oxidation on the bending fatigue strength of case-hardened gears. The test gears were case-hardened by gas-carburizing and vacuum-carburizing methods, and the degree of intergranular oxidation and the grain size of these gears were examined. Bending fatigue te…
The authors previously reported that polyunsaturated fatty acids having 1, 4-diene structure can be easily conjugated at ordinary temperature using iodine as a photosensitizes.This paper describes the optimum conditions for the iodine-sensitized conjugation of methyl linoleate under irradiation with a 100W high-pressu…
Diatoms (Bacillariophyceae) from Nostra pond (Cumbres Calchaquies), Tucu man province, Argentine). The diatomologic association found in the sediment of the bottom of Nostra pond (4300 m over s.l.) is analysed. Thirty one taxa have been identified including species, varieties and formae, fo which the dominant ones wer…
The X-ray elastic constants of composite ceramics of zirconia mixed with 40wt% alumina were determined by X-ray stress measurements and compared with theoretical predictions. The results obtained are summarized as follows:(1) The X-ray elastic constants were determined for the diffraction from Al2O3 (146) plane by Cu-…
Infrared spectra are reported of Fe/Al2O3, Fe/SiO2 and K2O, Al2O3 and doubly promoted Fe/SiO2 after treatment at 298–723 K in a gaseous mixture of carbon monoxide and ammonia. Product species included isocyanate groups on iron, surface cyano complexes on iron and isocyanate groups either on the oxide supports or invol…
The catalytic activity for the oxidation of CO with molecular oxygen of silver catalysts containing large silver particles (ca. 1 µm) has been studied. Both pure and caesium-promoted silver catalyst were investigated. The various pretreatments to which the catalysts were subjected, i.e. reduction or oxidation at diffe…
Until the mid-1960's, procedures for studying shell microstruetures were laborious and, for many purposes, unsatisfactory. Depositional surfaces were observed with binocular microscopy, and shell material was embedded in various media, sectioned, mounted on a glass slide, and observed with ordinary light and polarized…
Abstract This article describes procedures for producing powder metallurgy high-speed tool steel powder by inert-gas atomization, followed by compaction by hot isostatic pressing. These include the anti-segregation process (ASP) and the crucible particle metallurgy (CPM) process. The article reviews the properties of…
Many bacterial clustered regularly interspaced short palindromic repeats (CRISPR)–CRISPR-associated (Cas) systems employ the dual RNA–guided DNA endonuclease Cas9 to defend against invading phages and conjugative plasmids by introducing site-specific ...Read More
The metallurgical structures which control the resistance to embrittlement of weld regions of heavy-wall hydrotreatment reactor vessels are described in this paper. Specifically, the control of notch toughness properties of heavy-section submerged-arc narrow-gap welds in 2.25 Cr-1 Mo steel after post-weld heat treatme…
Spectroscopy on the new laser host crystal NaYF4 doped with Nd indicates that this host has both strong broad absorption bands suitable for diode pumping and an integrated cross-section higher than that of YAG. Ho:NaYF4 shows similar properties with broad emission bands suitable for tunable laser operation.
It has been considered that products with particular crystal structures, such as unidirectionally solidified columnar grains, a single crystal and an in-situ composite eutectic structure, can be manufactured with an upward continuous casting process. In this work, after surveying various upward continuous casting proc…
Specimens of Naval brass and 70–30 and 90–10 copper-nickel were monitored using the polarisation resistance method during lengthy exposure to flowing sea water that was intermittently contaminated with sulphides. Exposure of the 90–10 or 70–30 alloys to sulphides delayed or prevented the development of a protective fi…
Abstract Molecular weight has a considerable influence on the mechanical properties and density of polytetrafluoroethylene. Empirical equations have been found relating tensile properties and density to the number‐average molecular weight.
We perform a linear stability analysis of the periodic crenellated front profiles which provide an amplitude threshold for the cellular instability of a faceted directional solidification front [1]. This analysis assumes that facets are much longer than curved parts of the front (risers). We show that, while the crene…