Intellectual Control System of Processing on CNC Machines

Scientific and technical progress makes great demands for quality of engineering production. The priority is to ensure metalworking equipment with required dimensional accuracy during the entire period of operation at minimum manufacturing costs. In article considered the problem of increasing of accuracy of processing products on CNC. The authors offers a solution to the problem by providing compensating adjustment in the trajectory of the cutting tool and machining mode. The necessity of creation of mathematical models of processes behavior in an automated technological system operations (OATS). Based on the research, authors have proposed a generalized diagram of diagnosis and input operative correction and approximate mathematical models of individual processes of diagnosis

Development of Requirements for a Basic Standardized Mathematical Model of Geokhod

The article revealed the shortcomings of existing mathematical models geokhods, the necessity of a new approach to modeling the processes of internal and external geokhods interaction, formulated the task of building flexible mathematical models

Metallurgical Properties and Phase Transformations of Barium-Strontium Modifier

Metallurgical properties and phase transformations of barium-strontium modifier were tested in laboratory conditions resembling steel processing in furnace and ladle. When heating barium-strontium modifier start of melting, kinetics of decomposition, phase and structure transformation were studied. The concentrate under consideration has been revealed to be a complex mineral compound containing barytocalcite, calcite, calciostrontianite, dolomite and siderite. The reaction kinetics of decomposing mineral components of barium-strontium modifier to oxides does not considerably affect slag formation in conditions of out-of-furnace steel processing

Knowledge Management as a Strategy for the Administration of Education in the Research University

The article studies the substantiation of the changes in the Classical University when its liberal model is transforming into the pragmatic model in modern knowledge society. The content of pragmatic model (commercialization of knowledge, education market, competitions) is against its classical model. Therefore, there is a need to clarify the criteria of the Classical University. The corporate culture is considered as its new criterion. The corporate culture aimed towards shaping of the professional and the person who is relevant to the modern knowledge society. Therefore, the modern Research University continues the traditional Idea of the Classical University in conditions of information (knowledge) society. Secondly, new strategy for the management of education in the Research University is the knowledge management. Thirdly, the corporate culture of the Research University can join complementarily the classical criteria of University and modern orientation to the market and commercialization of education. The specific content of the corporate culture as a new criterion of the University is relevant to the conditions of information or knowledge society. The corporate culture of the Research University provides not only competitiveness of professional, but also in its spiritual and moral characteristics

Joint Destruction of Cadmium and Copper at Alternating Current Electrolysis in Sodium Hydroxide Solution

The dependence of the metal oxidation rate on the current density and temperature of joint destruction in sodium chloride was studied. It is established that the dependence of the oxidation rate of copper is linear and generally do not differ from the dependencies established at individual oxidation of copper in the solution of sodium chloride with concentration 46.5% wt. In contrast to the oxidation rate of copper, the oxidation rate dependence of cadmium has extreme character and the oxidation rate of cadmium at its joint oxidation of copper increased in 2-3 times indicating that the mutual influence of electrodes at the electrochemical process with alternating current. Thus, the obtained dependences can predict operating electrolysis parameters a obtain copper-cadmium oxide system of the given composition

Influence of Filler Metals in Welding Wires on the Phase and Chemical Composition of Weld Metal

The influence of filler metals used in welding wires on the phase and chemical composition of the metal, which is surfaced to mining equipment exposed to abrasive wear, has been investigated. Under a laboratory environment, samples of Mo-V-B and Cr-Mn-Mo-V wires were made. The performed experiments have revealed that fillers of the Cr-Mn-Mo-V system used in powder wire show better wear resistance of the weld metal than that of the Mn-Mo-V-B system; the absence of boron, which promotes grain refinement in the Mn-Mo-V-B system, significantly reduces wear resistance; the Mn-Mo-V-B weld metal has a finer structure than the Cr-Mn-Mo-V weld metal

Неинвазивная вентиляция позволяет обеспечить адекватный газообмен, сводя к минимуму легочные и экстрапульмональные осложнения

The objective: to evaluate the effectiveness of NIPPV (nasal intermittent positive pressure ventilation) and NHFOV (nasal high-frequency oscillatory ventilation) modes in newborns in the delivery room depending on the gestation period.Subjects and methods. A prospective randomized study included 88 premature newborns with the body mass of 1,405 (1,085–1,760) gr. and gestation period 31 (29–32) weeks. In children of the first group, the NIPPV mode was used, and in the second group – NHFOV. Children of each group were divided into subgroups: subgroup 1 consisted of newborns with a gestation period of 30–32 weeks, subgroup 2 – 26–29 weeks.Results. The need for the traditional ventilator was significantly greater in the group of NIPPV – 15 children, compared to the group of NHFOV – 2 children (p = 0.001). In the same subgroup, statistically significant differences were found in the frequency of bronchopulmonary dysplasia (BPD) and intraventricular hemorrhage (IVH) (p < 0.05). In particular, in the NIPPV group, BPD was registered in 33.3% of cases, while in the NHFOV group – 3.7% (p = 0.001). In children a gestation period of 26–29 weeks, the opposite results were noted. Retinopathy of prematurity was detected in 80% (12) of children on NHFOV and 12.5% (2) who received NIPPV (p = 0,001)). There were also statistically significant differences in the frequency of BPD formation – 9 cases in the first group, 13 cases in the second group (p = 0.04).Conclusion. The use of NIPPV as a starting method of respiratory support is indicated to newborns with the gestation age of 26–29 weeks, and while in newborns with the gestation period of 30–32 weeks, the use of NHFOV is highly effective. Цель: оценить эффективность режимов NIPPV (Nasal intermittent positive pressure ventilation – назальная вентиляция с перемежающимся положительным давлением) и NHFOV (Nasal high-frequency oscillatory ventilation – неинвазивная высокочастотная осцилляторная вентиляция) у новорожденных в родильном зале в зависимости от срока гестации.Материалы и методы. Проведено проспективное рандомизированное исследование 88 недоношенных новорожденных с массой тела 1 405 (1 085–1 760) г и сроком гестации 31 (29–32) неделя. У детей 1-й группы применяли режим NIPPV, а 2-й – NHFOV. Дети каждой из групп разделены на подгруппы: 1-я подгруппа – новорожденные со сроком гестации 30–32 недели, 2-я подгруппа – 26–29 недель.Результаты. Потребность в традиционной искусственной вентиляции легких была значимо больше в группе NIPPV (15 детей), в группе NHFOV – 2 ребенка (p = 0,001). В этой же подгруппе выявлены статистически значимые различия по частоте развития бронхолегочной дисплазии (БЛД) и внутрижелудочковых кровоизлияний (p < 0,05). В частности, в группе NIPPV БЛД зарегистрирована в 33,3% случаев, тогда как в группе NHFOV – в 3,7% (p = 0,001). У детей со сроком гестации 26–29 недель отмечены противоположные результаты. Ретинопатия недоношенных выявлена у 80% (12) детей, находившихся на NHFOV, и у 12,5% (2) детей, получавших NIPPV (p = 0,001). Также выявлены статистически значимые различия по частоте формирования БЛД: в 1-й группе – 9 случаев, во 2-й – 13 (p = 0,04).Заключение. Применение NIPPV как стартового метода респираторной поддержки показано у детей со сроком гестации 26–29 недель, а у новорожденных со сроком гестации 30–32 недели высокоэффективным является использование NHFOV.

Phase Composition and Microstructure of Ti-Nb Alloy Produced by Selective Laser Melting

The phase composition and microstructure of Ti-Nb alloy produced from composite titanium and niobium powder by selective laser melting (SLM) was studied. Produced monolayered Ti-Nb alloy enhanced the formation of fine-grained and medium-grained zones with homogeneous element composition of 36-38% Nb mass interval. Alloy phase composition responded to [beta]-alloy substrate phase (grain size was 5-7 pm) and non-equilibrium martensite [alpha]"- phase (grain size was 0.1-0.7 [mu]m). [alpha]"-phase grains were found along [beta]-phase grain boundaries and inside grains, including decreased niobium content. Alloy microhardness varied within 4200-5500 MPa

On a Physicochemical Method of Prospecting for Molybdenum in the Semidesert Climate of the Northern Lake Balkhash Area

A selection of Russian papers on the geochemical prospecting for ore

Broadband X-ray spectrum of XTE J1550-564 during 2003 outburst

Results of broadband INTEGRAL and RXTE observations of the Galactic microquasar XTE J1550-564 during outburst in spring 2003 are presented. During the outburst the source was found in a canonical low/hard spectral state.Comment: 5 pages, 3 figures. Accepted for publication in Astronomy Letter