The problems of application of domestic ore raw materials in the production of ferroalloys

There is a difficult situation with ferroalloy production in Russia - production has a raw material import dependence in the presence of our own large, although not quite high-quality, in accordance with world standards, mineral resource base. As rule, domestic ferroalloy raw materials are of low quality: a low content of leading elements (manganese, chromium ores), a high content of phosphorus (manganese, niobium ores), sulfur (manganese ores). The paper gives examples of a complex of physicochemical studies and the development of a number of alternative technologies for the smelting of new ferroalloy compositions with Mn, Cr, Nb, W. The scientific studies together with the development of the technology have been carried out to study the effect of ferroalloys composition on consumer properties. Because of the fact that the chemical composition of the ores of most new deposits cannot ensure the production of standard ferroalloys. By help deep physicochemical and technological studies it is possible to create new processes and combinations of different types of ferroalloys from non-traditional domestic mineral raw materials. The alloys are not inferior in terms of technical and economic indicators of products obtained from rich imported ore materials. © Published under licence by IOP Publishing Ltd.The work was carried out according to the government contract of IMET UB RAS and according to the RFBR project No. 19-03-00451

Особливості викладання дисциплін гуманітарного і соціально-економічного циклу для іноземних студентів у медичному коледжі

Проаналізовано педагогічні умови здобуття освіти іноземними студентами в медичному коледжі. Охарактеризовано організаційно-педагогічні аспекти навчального процесу. The article analyzed the pedagogical condition of education foreign students in medical college. An organizational and pedagogical aspect of an education process is characterize

Risk-taking Urban bats vs. hesitant rural bats: urbanization drives behavioral flexibility and brain plasticity in Egyptian fruit bats

Urbanization is arguably the most dramatic phenomenon influencing animals around the world. Although many behavioral adjustments have been described in urban animal populations, we know very little about the possible impacts of urbanization on animals' brains. Egyptian fruit bats thrive in both urban and rural environments, but they are faced with very different challenges in these two environments. We show that urban fruit bats are significantly bolder than rural bats, a characteristic that is probably crucial for their survival in urban environments. Magnetic Resonance Imaging revealed that the brains of the two populations differ in areas related to navigation, sensing and reward. Over a month in the lab, both rural and urban bats became bolder and a correlation between brain and behavior suggests that neural plasticity in the brain's fear-related network and specifically in the amygdala is related to this behavioral flexibility. Linking brain plasticity with behavioral flexibility in wild free-behaving animals is very difficult. This study shows the potential of combining non-invasive imaging and behavioral assay in order to reveal the impact of global ecological changes on wild animals. The data presented here is the preprocessed MRI scans of 84 urban (city) and rural (country) bats. It was preprocessed and asigned into 3 contrasts: gray matter (GM) derived from anatomical scans, and functional anisotropy (FA) and mean diffusivity (MD) derived from DTI scans. The numbers at the scans names denote specific individual bats, with the same numbers in the before and after scans. In the sorted data folder, you can find all the scans divided into the 3 different contrast. inside each contrast folder there are 16 folders- 8 for urban bats start with U and 8 folders for rural bats start with R, the numbers 1-5 are batch numbers- different repetitions of the experiment and for batches 1-3 there are 2 scans available (before and after), folders with the "after" scans end with b. The folder scripts contains Matlab scripts and mat files that were used in the data analysis. The main script is "full_analysis" that uses other scripts from the folder for the statistical analysis. In the sorted data folder there is Masks folder in which you can find 2 masks that are needed for the scripts and a mean bat file to visualize the results on

Risk-taking Urban bats vs. hesitant rural bats: urbanization drives behavioral flexibility and brain plasticity in Egyptian fruit bats

Urbanization is arguably the most dramatic phenomenon influencing animals around the world. Although many behavioral adjustments have been described in urban animal populations, we know very little about the possible impacts of urbanization on animals' brains. Egyptian fruit bats thrive in both urban and rural environments, but they are faced with very different challenges in these two environments. We show that urban fruit bats are significantly bolder than rural bats, a characteristic that is probably crucial for their survival in urban environments. Magnetic Resonance Imaging revealed that the brains of the two populations differ in areas related to navigation, sensing and reward. Over a month in the lab, both rural and urban bats became bolder and a correlation between brain and behavior suggests that neural plasticity in the brain's fear-related network and specifically in the amygdala is related to this behavioral flexibility. Linking brain plasticity with behavioral flexibility in wild free-behaving animals is very difficult. This study shows the potential of combining non-invasive imaging and behavioral assay in order to reveal the impact of global ecological changes on wild animals. The data presented here is the preprocessed MRI scans of 84 urban (city) and rural (country) bats. It was preprocessed and asigned into 3 contrasts: gray matter (GM) derived from anatomical scans, and functional anisotropy (FA) and mean diffusivity (MD) derived from DTI scans. The numbers at the scans names denote specific individual bats, with the same numbers in the before and after scans. In the sorted data folder, you can find all the scans divided into the 3 different contrast. inside each contrast folder there are 16 folders- 8 for urban bats start with U and 8 folders for rural bats start with R, the numbers 1-5 are batch numbers- different repetitions of the experiment and for batches 1-3 there are 2 scans available (before and after), folders with the "after" scans end with b. The folder scripts contains Matlab scripts and mat files that were used in the data analysis. The main script is "full_analysis" that uses other scripts from the folder for the statistical analysis. In the sorted data folder there is Masks folder in which you can find 2 masks that are needed for the scripts and a mean bat file to visualize the results on

Розвиток іскрового плазмового спікання (ІПС) для отримання нанокристалічного термоелектричного матеріалу Bi0.5Sb1.5Te3 p-типу

Bismuth antimony telluride is the most commonly used commercial thermoelectric material for power generation and refrigeration over the temperature range of 200–400 K. Improving the performance of these materials is a complected balance of optimizing thermoelectric properties. Decreasing the grain size of Bi0.5Sb1.5Te3 significantly reduces the thermal conductivity due to the scattering phonons on the grain boundaries. In this work, it is shown the advances of spark plasma sintering (SPS) for the preparation of nanocrystalline p-type thermoelectrics based on Bi0.5Sb1.5Te3 at different temperatures (240, 350, 400oC). The complex study of structural and thermoelectric properties of Bi0.5Sb1.5Te3 were presented. The high dimensionless thermoelectric figure of merit ZT ~ 1 or some more over 300–400 K temperature range for nanocrystalline p-type Bi0.5Sb1.5Te3 was obtained.Телурид сурми вісмуту є найбільш часто використовуваним комерційним термоелектричним матеріалом для виробництва електроенергії та охолодження в діапазоні температур 200 - 400 К. Поліпшення експлуатаційних характеристик цих матеріалів доповнюється балансом оптимізації термоелектричних властивостей. Зменшення розміру зерен Bi0,5Sb1,5Te3 суттєво знижує теплопровідність за рахунок розсіювання фононів на границях зерен. У цій роботі показано досягнення іскрового плазмового спікання (ІПС) для отримання нанокристалічних термоелектриків р-типу на основі Bi0,5Sb1,5Te3 при різних температурах (240, 350, 400oC). Було представлено комплексне дослідження структурних та термоелектричних властивостей Bi0.5Sb1.5Te3. Отримано високе значення безрозмірної термоелектричної добротності ZT ~ 1 і навіть трохи більше в діапазоні температур 300 - 400 K для нанокристалічного Bi0,5Sb1,5Te3 p-типу провідності

Influence of electron injection on the photoresponse of ZnO homojunction diodes

Forward bias electron injection into the p side of a p-n homojunction was shown to result in an improved response of the ZnO photodiodes. Injection of about 25 C of charge yielded a nearly 2.5-fold increase of photocurrent at 350 nm. This improvement was correlated with the increase of the diffusion length of minority electrons in p-type ZnO:Sb as determined by electron beam induced current measurements. It is suggested that the increase of the diffusion length is related to the carrier trapping on nonionized acceptor levels