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Magnetization curves measured with the Vibrating-Sample Magnetometer (VSM) are presented for narrow (2 × 11 mm typical) rectangular samples sliced from superconducting Nb-Ti cold-rolled tape with high pinning anisotropy. There are two types of samples: sliced along (RD) and across (TD) to the rolling direction. An anomalous shift of the magnetization central peak was found for TD-samples and not observed for RD-samples. This central peak shift is opposite in sign to the known one, which is usually observed in bulk materials. The Magneto-Optical Imaging (MOI) pictures suggest a possible mechanism for such an anomalous shift. From the longitudinal side, the magnetic flux penetrates into the tape relatively evenly, in accordance with the predictions of the critical state model. However, it is not true for flux penetration from the transverse side of the sample. Instead, the flux forms a dendritic structure oriented primarily along the rolling direction. The existence of such a structure leads to a drastic change in total magnetization around zero external fields, depending on the orientation of the rolling direction to the long side of the sample. [ABSTRACT FROM AUTHOR]

The article discusses the problem of determining electrical parameters of superconducting coils with bare windings. Procedures for measuring these parameters are described; in particular, inductance was measured by the voltage of a linear current input at a given rate. Although it is demonstrated to be impossible to determine inductance in a winding with a bare superconductor in the normal state, the inductance of a winding is comparable to that of an insulated wire in a superconducting state at currents below the critical value. The results of measuring the inductance, radial resistance, static current-voltage and magnetic characteristics of two tape coils with bare superconducting windings, one of which had a soldered connection, are presented. The insulated and bare superconducting winding parameters were compared and measurement conditions for the latter were formulated. The results of the study are applicable to the design and operation of superconducting devices with bare windings, such as coils, magnetic storage devices, stator windings of electric machines, etc. [ABSTRACT FROM AUTHOR]

The superconducting magnetic system (SMS) project is proposed. The second-generation high-temperature superconducting tapes for SMS are developed, fabricated and tested in NRC "Kurchatov Institute." The magnet will be manufactured from non-insulated double pancake coils. Such a double pancake coil is manufactured and tested in liquid nitrogen. The integral radial resistance of this coil is determined. [ABSTRACT FROM AUTHOR]

The microstructure of a cold-rolled tape made of Nb–50 wt % Ti superconducting alloy before and after heat treatment has been investigated by transmission electron microscopy, scanning transmission electron microscopy, and microanalysis (including the mode of in situ annealing in the electron microscope column). The influence of heat treatment on the concentration and lateral sizes of α-Ti particles has been calculated. The Ti phase inclusions with fcc lattice are found in the α-Ti particles after in situ annealing. [ABSTRACT FROM AUTHOR]

The construction and operation of large solar power plants (SPPs) and the dependence of their production on light and other meteorological factors leads to a strong dependence of the operation modes of the Republic of Crimea and Sevastopol power system on meteorological factors. Today, given that the share of solar power plants is about 30% of the total installed capacity, it is necessary to solve the problems that have a great impact on the power system operating modes. With large output capacity of the solar power plant, the operator has to give commands to turn off the generating equipment of thermal power plants. In power systems with a large share of solar generation, it is necessary to solve this problem by improving the generated power predicting methods, as it will reduce the dependence of operating modes on weather factors and increase the reliability of the power system. The paper discusses the use of hybrid predicting methods that imply taking into account the possibility of the weather scenarios simulation, advanced cloud-based image processing technology, and close-to-real-time cloud motion surveillance cameras. There was an experimental software created that selects coefficients of set configuration time series. In combination with the conservative methods, it makes predicting the SPP Perovo output more accurate. Taken together, the chosen methods of predicting solar power generation capacity in the power system of the Republic of Crimea and Sevastopol ensure not only stability of the power system as a whole, but also the maximum efficiency of power plants, allow to accelerate the integration of solar power plants into the power system, and have positive effects on the environment. [ABSTRACT FROM AUTHOR]

The factors influencing the energy system of the Republic of Crimea were studied. Analysis of generating capacity to ensure reliable power supply to consumers and sustainability of the power system in different periods of the year was carried out. Research of the renewable energy role in the power system management was conducted, including the improvement of methods of management and optimization of solar power plants capacity. A study of the data necessary to build an optimal model of power system management was performed. Power system efficiency increased in relation to the price of electricity for consumers. We proposed the development of methods to optimize the production of solar power plants, affecting the operation of the Republic of Crimea and the Middle East power systems. Studies have established the dependence of the power system on the changeable generation of renewable energy sources, thereby showing the impact of meteorological factors on the power system operating modes. One of the rational approaches is the use of genetic algorithms to solve the problems of structural-parametric optimization of energy systems modes. It will allow optimizing of the management of the Republic of Crimea power system, including the creation of opportunities for optimal loading of the network, taking into account various specified conditions. The work identified the potential of Iraq's energy industry for renewable sources, where solar photovoltaic technologies are suitable for the production of electricity throughout Iraq, due to the uniform distribution of solar radiation throughout the country. The results of the work revealed that the result obtained is applicable not only to the power system of the Republic of Crimea, but also to other foreign power systems of the Middle East with a large number of renewable energy sources and the potential construction of new solar power plants, that can make it possible to optimize the power system management. [ABSTRACT FROM AUTHOR]