TEM study of the effect of high-temperature thermal cycles on the stability of the Y-Al-O oxides in MA956 ODS steel

MA956, a commercial ferritic grade of Oxide Dispersion-Strengthened (ODS) steel, was investigated using transmission electron microscopy (TEM) to evaluate the influence of high-temperature thermal cycles on the nanometric dispersed oxides. Analyses of the oxide size distribution were carried out on foils from the as-received MA956 and following treatment at 1285ºC for one hour, and show that growth of the oxides has occurred under the thermal cycle. Implications for the oxide stability in the steel matrix are discussed, in the light of the oxide chemical composition

Atomic force microscopy studies of the surface scale formed during oxidation of incoloy MA956

The formation of thin oxide films on {111} and {110} single crystal specimens of Fe20Cr5A1 based oxide dispersion strengthened alloy during the early stages of oxidation up to 1000°C was investigated by atomic force microscopy. The atomic force microscopy results revealed the crystalline character of a corrosion layer. The alumina scale morphology (height and grain size of crystallites) was only slightly dependent on the crystallographic texture of the underlying bulk material. The results show that atomic force microscopy has the potential to study surface structure of oxide layers in the initial stages of an oxidation process

Организация бухгалтерского учета и анализ основных средств

В дипломной работе освещена тема «Состояние учета основных средств и выявление его недостатков». Целью данной дипломной работы является решение следующих задач: изучить проанализировать теоретические основы учета и контроля основных средств (ОС). Дать общую характеристику активам, определить состав, порядок оценки, виды стоимости в учете, критерии отнесения активов к группе ОС. Проанализировать и описать организацию системы бухгалтерского учета на исследуемом предприятии, используемые программные продукты ведения учета. Провести анализ эффективности использования на предприятии системы учета основных средств. Разработать рекомендации по совершенствованию системы учета и эффективности использования основных средств.The thesis covered the topic "State of accounting of fixed assets and to identify its shortcomings." The aim of this thesis is to solve the following tasks: learn to perform theoretical foundations of accounting and control of fixed assets. To give a General characterization of the assets to determine the composition, the order of evaluation, types of cost in accounting criteria for the assignment of assets to the asset group. To analyse and describe the organization of the accounting system at the study company used software products of accounting. To analyze the efficiency of using the company's system of accounting of fixed assets. To develop recommendations for improving the accounting system and the effectiveness of use of the asset

Fabrication of Fe-Cr-Al oxide dispersion strengthened PM2000 alloy using selective laser melting

This paper was the first to show that melt-sensitive oxide dispersion strengthened powder metallurgy alloys such as Fe-Cr-Al PM2000 alloy could be successfully processed into solid components using Selective Laser Melting (SLM). The key finding of the work was that high solidification rates prevented coarsening of dispersion strengthened particle diameters, which usually occurs during melting and compromises the high temperature creep strength of these alloys. The work has been internationally cited and was the foundation for inspiring further work which aimed to produce novel heat exchangers for space applications using this rapid prototyping technique

LE PROBLÈME DE LA CONSERVATION D’UN SABRE HISTORIQUE DU POINT DE VUE DE LA CORROSION DES MÉTAUX

L ’atelier de conservation des métaux au Musée National de Poznań a réalisé la restau ratio n d’un sabre d it „du roi Batory”, découvert pendant les trav au x de construction à l’Ancienne Ville de Poznań. La lame p o rtan t des inscriptions d ’or, é tait dans un é ta t de corrosion avancée. Le fourreau en bois recouvert de velours et ayant une a rm a tu re en argent d oré avait été cassé. L’arma ture du fo u rreau et la poignée d u sabre é taien t en bon é ta t de conservation. Nous avons observé que la corrosion é tait p a rticulièrement avancée dans les endroits où l ’acier de la lame touchait à l’o r des inscriptions. Cela confirme le fa it qu’un métal précieux en contact avec un méta l moins précieux accélère la corrosion de ce dernier. Inversement, un métal moins précieux en contact avec un métal précieux le protège contre la corrosion, pendant que lui-même subit une corrosion accélérée. La conservation de la lame ayant pour but la protection des incrustations en or des parties corrodées a été faite par des moyens mécaniques. Le fourreau a été collé, recouvert d’un velours neuf et l’a rm a tu re a été nettoyée

La Cour Suprême de la République populaire de Pologne

Piasecki Kasimierz, Wasilkowska Zofia. La Cour Suprême de la République populaire de Pologne. In: Revue internationale de droit comparé. Vol. 30 N°1, Janvier-mars 1978. La cour judiciaire suprême. Enquête comparative. pp. 399-423