Application of fluoride salt systems for obtaining titanium by the method of electrolysis

Fundamentally new fluoride method of synthesis of high-clean metal titanium powder from natural oxide concentrates has been proposed. In a closing stage of processing the electrolytic method of titanium tetrafluoride decomposition in soft eutectic of alkalis fluoride salts was used for the first time. Using this method in industrial practice allows excluding environment contamination with hazardous chemical substances and obtaining cheap high-clean metal titanium powde

Purity-bounded uncertainty relations in multidimensional space -- generalized purity

Uncertainty relations for mixed quantum states (precisely, purity-bounded position-momentum relations, developed by Bastiaans and then by Man'ko and Dodonov) are studied in general multi-dimensional case. An expression for family of mixed states at the lower bound of uncertainty relation is obtained. It is shown, that in case of entropy-bounded uncertainty relations, lower-bound state is thermal, and a transition from one-dimensional problem to multi-dimensional one is trivial. Results of numerical calculation of the relation lower bound for different types of generalized purity are presented. Analytical expressions for general purity-bounded relations for highly mixed states are obtained.Comment: 12 pages, 2 figures. draft version, to appear in J. Phys. A Partially based on a poster "Multidimensional uncertainty relations for states with given generalized purity" presented on X Intl. Conf. on Quantum Optics'2004 (Minsk, Belarus, May 30 -- June 3, 2004) More actual report is to be presented on ICSSUR-2005, Besan\c{c}on, France and on EQEC'05, Munich. V. 5: amended article after referees' remark

ДОСВІД РОЗРОБЛЕННЯ ОПИТУВАЛЬНИКА «КОНФІГУРУВАННЯ ПСИХОЛОГІЧНИХ МЕЖ ОСОБИСТОСТІ»

Стаття містить послідовне описання побудови й валідизації багато­шкаль­ного особистісного опитувальника, який ґрунтується на авторській  моделі конфігурування психологічних меж особистості. Проаналізовано деякі сучасні підходи щодо розуміння феномену психологічних меж особистості й актуаль­ний стан тестологічних здобутків на цю тему в психодіагностичній галузі. Наведено емпіричну операціональну модель конфігурування психологічних меж особистості. Психологічні межі показані як функціональні органи особистості. Операціонально визначено ключові параметри психологічних меж особистості для подальшого їх дослідження за допомогою тестів. Розкрито сутність поняття конфігурування психологічних меж особистості. Описано зміст поняття психо­логічний суб-простір особистості (вимір психологічного простору особистості) й емпіричну процедуру виокремлення психологічних суб-просторів особистос­ті, що найчастіше задіяні в діадній комунікації. Вирізнено типи й основні етапи конфігурування психологічних меж особистості в міжособистісній взаємодії. Розглянуто низку психометричних процедур, задія­них під час конструювання методики. Наведено двохетапну процедуру забезпе­чення змістовної валідності опитувальника «Конфігурування психологічних меж особистості». Також пере­лічено деякі психометричні процедури побуду­вання й корекції шкал опитуваль­ника. Розгорнуто схарактеризовано оригіналь­ну змістовну структуру шкал методики. Перелічено основні шкали опитуваль­ника та спосіб їх оцінювання. Наведено результати апробаційного експери­менту й здійсненого статистичного аналізу. Схарактеризовано емпіричну вибір­ку пілотажного тестування та прин­ципи її формування. Зазначено зміст і послідовність прийомів для забезпечення очевидної та дискримінативної валідності, а також достовірності шкал опиту­вальника. Доведено валідність і надійність розробленого тесту. Окреслено сфери його застосування.Ключові слова: особистісний опитувальник, конфігурування психологіч­них меж особистості

Obtaining the fine-grained silicon carbide, used in the synthesis of construction ceramics

Silicon carbide is used in the production of construction and temperature-resistant goods, capable of withstanding high mechanical and thermal loads. During recent times, silicon carbide has been frequently used in the electronics industry. Since sintered silicon carbide has increasingly been used as a replacement for metal components of various devices, the process of obtaining compact goods from silicon powder has become the defining factor in the technology used for its synthesis. The selection of conditions in which the sintering is conducted depends on granulometric structure, the form and the surface condition of the initial powder. The work consists of the synthesis of silicon carbide powder using the purified form of metallurgical silicon powder and soot. The qualities of testing samples were studied, where silicon carbide was obtained using established technology, from mechanically activated elementary, fine-grained silicon and soot, by pyrolytic synthesis. It was demonstrated that synthesis produces highly pure silicon carbide powder, (α- and β-phases) with a granulometric composition that allowed subsequent sintering to produce high quality compact goods. It was established that the content of silica in synthesized silicon carbide powder does not exceed 1-2% of the total mass

Schmidt number of pure bi-partite entangled states and methods of its calculation

An entanglement measure for pure-state continuous-variable bi-partite problem, the Schmidt number, is analytically calculated for one simple model of atom-field scattering.Comment: 3 pages, 1 figure; based on the poster presentation reported on the 11th International Conference on Quantum Optics (ICQO'2006, Minsk, May 26 -- 31, 2006), to be published in special issue of Optics and Spectroscop

Design Features of Multistage Centrifugal Compressor of Vapor Refrigerating Machine with Complete Working Fluid Intercooling

© 2017 The Authors. Published by Elsevier Ltd. The work sets out the distinctive features of the method of gas-dynamic calculation of multistage centrifugal compressors for refrigerating machines running on a cycle of multi-stage compression of working fluid with its complete intercooling between the stages. The parameters of width of specific sections of the impellers, diffusers, and reverse guide vanes as well as the operating parameters during polytropic compression and parameters of the inner power of the compressor were corrected. The research outcomes can be used in the design of centrifugal compressors for refrigerating machines operating at the specified cycle

Research of Magnetizing Roasting of Iron Ore Before Beneficiation and Dephosphorizing

There are quite a lot of iron ore deposits in the world with increased (0.75%) phosphorus content, which is an obstacle to their involving in production. Research of removal of detrimental impurities from such iron ores has a great prospect. On the experimental base of OJSC VNIIMT, it was studied dephosphorizing technology at which after preliminary magnetizing roasting and subsequent dephosphorization of iron ore with aqueous solution of sulfuric acid the least residual phosphorus content in concentrate was observed. Research of influence of temperature and duration of magnetizing roasting on iron content and residual phosphorus content in dephosphorized concentrate was studied. The influence of specific consumption of solid reductant (brown coal) on the quality of magnetite concentrate was also studied. Based on the results of the experiment, the optimal technological parameters of magnetizing roasting of iron ore before beneficiation and subsequentdephosphorization were selected. Keywords: magnetizing roasting, beneficiation, dephosphorizing, research, rotary furnace, optimal process parameters, iron content, residual phosphorus conten

Iron Ore Dephosphorization of Gara Djebilet Deposit By Hydrometallurgical Method

For industrial use, iron-ore concentrates shall correspond to definite requirements regarding both basic substance content – iron as well as phosphorus content. Decreased phosphorus content in iron-ore concentrate can be received by the method of hydrometallurgy (desalinization of phosphorus by mineral acid). On theexperimental base of OJSC VNIIMT, a laboratory research was carried out regarding iron ore dephosphorization; as a result maximum possible content of phosphorus was obtained in a final product. The optimal technological parameters of sulphuric acid desalinization were defined that have an effect on quality of phosphorus removal of iron ore magnetite concentrate: size degradation of roasted concentrate; phosphorus removal duration; pulp heating temperature effect; sulphuric acid-specific consumption. Keywords: desalinization, iron ore, concentrate, pulp, sulphuric acid, phosphorus content, optimal parameter