Materials Literature
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To exploit the full potential of parallelism of light in optical processing systems it is of paramount importance to have optical components which can efficiently generate arrays of >100 × 100 beams and/or images. In this paper we report on fabrication of very large binary phase grating beam splitters, better known…
El Programa Latinoamericano de Lucha contra la Corrosión (P.L.C.) se encuentra insertado dentro de los proyectos apoyados por la Organización de los Estados Americanos (OEA), participando además Brasil, Chile y México. Tiene por objetivo fundamental la transferencia de información al usuario con el fin de combatir la…
A trial has been conducted to apply Oxidation-Reduction Potential (ORP) to the on-line monitoring of Fe2+ and Fe3+ in a chloride bath for iron plating having iron concentration of 160230 g/l and Fe3+/Fe2+ concentration ratio of 0.01 0.12.From the analysis of ORP's at different bath pH (0.51.4), temperature (2095°) and…
Effects of water, chloride ion and formic acid on galvanic corrosion of mild steel coupled to noble metal in methanol have been investigated by the amount of galvanic current with zero impedance ammeter and by weight loss measurement. The corrosion rate of mild steel in methanol containing chloride ion and water was f…
18-8 stainless steel ingots which are added with surface active elements, Bi, Sn, Te are cast with the water cooled copper mold at the pouring speed of 10 mm/s. Transverse and longitudinal microstructures in the vicinity of the surface of ingots are observed. The solidification microstructures become fine and the effe…
Al2O3 composites reinforced with (0-40)mass% SiC whisker were prepared at a temperature range 1673 K-2123 K for 3.6 ks under 40 MPa by hot-pressing and the effects of pretreatment process of SiC whisker and SiC whisker content on the mechanical properties of the composites were mainly investigated. The toughening mech…
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