Impact of High-Temperature, High-Pressure Synthesis Conditions on the Formation of the Grain Structure and Strength Properties of Intermetallic Ni[3]Al

The impact of the preliminary load on 3Ni+Al powder mixture and the impact of the duration of the delay in application of compacting pressure to synthesis product under the conditions of continuous heating of the mixture up to its self-ignition on the grain size and strength properties of the synthesized Ni[3]Al intermetallide material have been studied. The grain structure of the intermetallide synthesized under pressure was studied by means of metallography, transmission electron microscopy and EBSD analysis, with the dependence of ultimate tensile strength on the grain size in the synthesized intermetallide having been investigated at room temperature and at temperatures up to 1000°С. It is shown that an increase in the pressure preliminarily applied to the initial mixture compact results in reduced grain size of the final intermetallide, whereas an increase in pre-compaction time makes the grain size increased. A decrease in the grain size increases the ultimate tensile strength of the intermetallide. The maximum value of the ultimate tensile strength in the observed anomalous temperature dependence of this strength exhibits a shift by 200°С toward higher temperatures, and the ultimate strength of the synthesized intermetallide at 1000°С increases roughly two-fold

Перспективы развития вузовских библиотек в научной информационной среде

The author systematize history of Russian university libraries, analyze their progressing in digital environment, and discuss new possibilities for modernizing education and academic libraries, in particular. The laws and regulations for university libraries are reviewed; their functions and services are specified. As a result of global information processes intensive growth, the demand for elibraries and their services have been increasing. The students of Cherepovets State University were surveyed on the issues of library service efficiency. The survey proved the significance and relevance of library services for the students; the strengths and weaknesses of library services were identified. The authors emphasize the need for intensifying marketing component in library activities and promotion of its services, and for studying target audience demands. The prospects for academic libraries are also discussed.Авторы статьи систематизируют исторические этапы развития университетских библиотек в России; анализируют поступательные изменения, происходящие в деятельности библиотек университетов в условиях цифровой среды; отмечают влияние цифрового развития общества на открытие новых возможностей для модернизации не только образовательной сферы, но и вузовских библиотек. В статье отражена нормативно-правовая база деятельности российских вузовских библиотек, уточнены их функции и направления работы. Отмечено, что развитие электронных библиотек стало следствием интенсивного развития мировых информационных процессов, в результате чего спрос на этот вид услуг продолжает расти. Приведены результаты опроса студентов относительно эффективности работы библиотечных сервисов на примере библиотеки Череповецкого государственного университета. Опрос подтвердил важность и актуальность услуг библиотеки для студентов. Выявлены слабые и сильные стороны организации услуг библиотеки, подчёркнута необходимость: усиления маркетинговой составляющей в деятельности библиотеки и продвижении её услуг, изучения запросов целевой аудитории. Изложены дальнейшие перспективы развития вузовских библиотек

EUROPEAN AIR TRAFFIC MANAGEMENT MASTER PLAN

EUROPEAN AIR TRAFFIC MANAGEMENT MASTER PLAN / Volodymyr P. Kharchenko, Alexander E. Luppo, Vitaliy A. Lazorenko, Svitlana N. Krylova // National Aviation University Proceedings. - 2011. – №3. – Р. 5-10.In the article the issue of prospects development of airspace and air traffic of Europe is considered. Main problems of the existed air navigation system have been reviewed. Some actions to be undertaken in Ukraine to improve its airspace indicators and increase the number of aircraft served by ATS units have been proposed. A performance based navigation concept is used by authors as a method to solve the problem. The concept is based on the principal of strict focus on desired results and well informed decision making process. The structure of the Master Plan and its stepwise implementation in the Europe airspace is described. The methods proposed to follow the plan structure appropriately have been reviewed. The performance based navigation concept can serve a key point in researches aimed at finding efficient ways to develop airspace and air traffic in Europe. The role and functions of ATS units within the framework of the performance based navigation concept are considered. In future more research of this issue will be conducted and new results will be published

КВАНТОВО-ХИМИЧЕСКОЕ ОБОСНОВАНИЕ СВОЙСТВ БИОРЕАГЕНТА, ОКИСЛЯЮЩЕГО СУЛЬФИДЫ ЦВЕТНЫХ МЕТАЛЛОВ

The paper determines the structural formula and quantum chemical characteristics of the most energetically probable, stable conformation of the bioreagent molecule formed during the oxidation of iron (II) ions by the autotrophic mesophilic iron-oxidizing bacteria Acidithiobacillus ferrooxidans in a solution of sulfuric acid consisting of iron (III) ion and three acid residues of glucuronic acid.The bioreagent oxidant is widely used in the industry for leaching metals from non-ferrous sulfide ores and enrichment concentrates.The quantum chemical characteristics of the bioreagent molecule are analyzed in comparison with the characteristics of anhydrous iron (III) sulphate, also used in hydrometallurgy as an oxidizer. The structure and quantum-chemical characteristics are studied using the method of molecular computer simulation, the theory of boundary molecular orbitals, and the Pearson principle. It has been established that the most energetically probable, stable conformation of the bioreagent molecule contains the acid residues of glucuronic acid of a non-cyclic structure. According to the research results, the bioreagent refers to the more rigid Lewis acid – electron acceptor – than iron (III) sulphate. The bioreagent molecule is less polarized, characterized by lower absolute electronegativity and 2 times larger volume. A theoretical substantiation of the greater persistence of primary sulphides – pyrite, pentlandite, chalcopyrite, relative to the secondary minerals – pyrrhotine, chalcocite and covellite is proposed based on the calculated values of the boundary molecular orbitals, absolute stiffness and electronegativity of iron, copper and nickel sulfides. The bioreagent characteristics that determine the interaction efficiency – volume, heat of formation, steric energy and its components, total energy, etc. are many times greater than for Fe2(SO4)3. The high oxidative activity of the bioreagent relative to Fe2(SO4)3 can be justified by the higher partial charge of the iron atom, the greater length of bonds between atoms, the lower energy of the lower free molecular orbitals and the greater degree of charge transfer during the interaction of the bioreagent with the sulfide minerals.Определены структурная формула и квантово-химические характеристики наиболее энергетически вероятной, устойчивой конформации молекулы биореагента, образуемого при окислении ионов железа (II) автотрофными мезофильными железоокисляющими бактериями Acidithiobacillus ferrooxidans в растворе серной кислоты, состоящего из иона железа (III) и трех кислотных остатков глюкуроновой кислоты. Биореагент-окислитель широко применяется в промышленности для выщелачивания металлов из сульфидных руд цветных металлов и концентратов обогащения. Проведен анализ квантово-химических характеристик молекулы биореагента в сравнении с безводным сульфатом железа (III), также используемым в качестве окислителя в гидрометаллургии. Для исследования структуры и квантово-химических характеристик использовались метод молекулярного компьютерного моделирования, теория граничных молекулярных орбиталей и принцип Пирсона. Установлено, что наиболее энергетически вероятная, устойчивая конформация молекулы биореагента содержит кислотные остатки глюкуроновой кислоты нециклической структуры. Согласно результатам исследований биореагент относится к более жесткой кислоте Льюиса (акцептору электронов), чем Fe2(SO4)3. Молекула биореагента менее поляризована и характеризуется меньшей абсолютной электроотрицательностью и в 2 раза бóльшим объемом.По рассчитанным значениям граничных молекулярных орбиталей, абсолютной жесткости и электроотрицательности сульфидов железа, меди и никеля предложено теоретическое обоснование большей упорности первичных сульфидов (пирита, пентландита, халькопирита) относительно вторичных минералов (пирротина, халькозина и ковеллина). Определяющие эффективность взаимодействия характеристики (объем, теплота образования, стерическая энергия и ее составляющие, общая энергия и др.) биореагента во много раз выше, чем у Fe2(SO4)3. Большая окислительная активность биореагента относительно Fe2(SO4)3 может обосновываться бóльшими частичным зарядом атома железа и длиной связей между атомами, меньшей энергией низшей свободной молекулярной орбитали, а также повышенной степенью переноса заряда при взаимодействии биореагента с сульфидными минералами

Peripheral vascular lesions with the development of hand and foot skin necrosis in a patient with COVID-19: a case report

In the presented case report, 36-year-old female patient, who was hospitalized in the rheumatology department, developed thrombotic microangiopathy and sepsis-related coronavirus disease 2019 (COVID-19). In the department, hereditary thrombophilia was revealed: heterozygous polymorphism in the coagulation factor 5 gene (Factor V Leiden). Livedo reticularis. It is known that in October 2020, the patient had COVID-19 with bilateral pneumonitis on chest computed tomography. On examination, dry gangrene of 1, 2, 4, 5 fingers of the right hand, 2 finger of the left hand, as well as 2, 3, 4, 5 fingers of the right and left feet were diagnosed. Necrosis of the nasal tip. Surgery was performed with amputation of the affected fingers and distal feet with autodermoplasty

MODERN APPROACH TO MOLECULAR CHARACTERIZATION OF PROSTATE TUMORS

The aim of the study was the development of a cell biosensor system based on the fact that AR activator stimuli lead to redistribution of AR from cytoplasm to the nucleus. These changes could be measured and used for the diagnostics and personalized treatment of prostate cancer patient. The stably transfected cell lines with fluorescently tagged AR were generated. For the stable cell expression the non AR expressing HeLa cell line was used. The constructs of chimeric fluorescent proteins wild type AR or mutant ART877A were used for the transfection. The changes of the CFP-AR-YFP and CFP-ART877A-YFP proteins in the nucleus of HeLa cells under different concentrations steroids treatment was investigated. Moreover, the quantity of activated receptor in the nucleus was carried

Enhancement of Raman light scattering in dye-labeled cell membrane on metal-containing conducting polymer film

An enhanced Raman spectroscopy method based on a plasmon resonance in ultrathin metal-containing LB-film deposited on nanoporous anodic alumina supports has been proposed. This material has been utilized to enhance Raman scattering of light in fluorescent-labeled subcellular membrane structures. It has been shown that the plasmon resonance between vibrational modes of the organometallic complexes monolayers and dye-labeled subcellular structures happens. It makes possible to detect interactions between living cell monolayers and an extracellular matrix

Poloxomer 188 Has a Deleterious Effect on Dystrophic Skeletal Muscle Function

Duchenne muscular dystrophy (DMD) is an X-linked, fatal muscle wasting disease for which there is currently no cure and limited palliative treatments. Poloxomer 188 (P188) is a tri-block copolymer that has been proposed as a potential treatment for cardiomyopathy in DMD patients. Despite the reported beneficial effects of P188 on dystrophic cardiac muscle function, the effects of P188 on dystrophic skeletal muscle function are relatively unknown. Mdx mice were injected intraperitoneally with 460 mg/kg or 30 mg/kg P188 dissolved in saline, or saline alone (control). The effect of single-dose and 2-week daily treatment was assessed using a muscle function test on the Tibialis Anterior (TA) muscle in situ in anaesthetised mice. The test comprises a warm up, measurement of the force-frequency relationship and a series of eccentric contractions with a 10% stretch that have previously been shown to cause a drop in maximum force in mdx mice. After 2 weeks of P188 treatment at either 30 or 460 mg/kg/day the drop in maximum force produced following eccentric contractions was significantly greater than that seen in saline treated control mice (P = 0.0001). Two week P188 treatment at either dose did not significantly change the force-frequency relationship or maximum isometric specific force produced by the TA muscle. In conclusion P188 treatment increases susceptibility to contraction-induced injury following eccentric contractions in dystrophic skeletal muscle and hence its suitability as a potential therapeutic for DMD should be reconsidered