Realization of energy-saving control modes on cranes of great load-carrying capacity

Saving energy is highly important for all types of lifting machinery. Research shows that it is possible to reduce energy consumption in mechanism drives at all stages of movement. Energy-saving control has already been implemented on cranes at the Dnister Hydroaccumulating Power Plant. The article describes the conditions and results of the implementatio

Realization of energy-saving control modes on cranes of great load-carrying capacity

Saving energy is highly important for all types of lifting machinery. Research shows that it is possible to reduce energy consumption in mechanism drives at all stages of movement. Energy-saving control has already been implemented on cranes at the Dnister Hydroaccumulating Power Plant. The article describes the conditions and results of the implementatio

Investigation of surface adhesion produced by high-speed flame spraying

Peculiarities of surface adhesion based on nickel, produced by high-velocity spraying on steel base with different surface morphology have been analysed. It is shown that ultrasound final polishing builds up wavy submicrorelief providing the reliable adhesive connection between covering and base. Ultrasound finite polishing is suggested as a method of preparing surface for high-speed flame

Single-turn Coils for Magnetic Pulse Welding of High-strength Steel Parts

Magnetic pulse welding provides high quality joining of fuel pin cladding for fast nuclear reactors. The tool coil there operates under the most stressful conditions: 40 T magnetic fields with tens of microseconds duration. This requires minimal coil inductance and affects the capabilities and lifetime of the coils. Two approaches are being practiced to enhance the coil durability: material research and construction optimization. The first approach considers the use of high strength steels or composite materials for the coil working area. The present work is aimed to realize the second approach – the use of multi position coils in order to maximize the number of parts welded in one coil. Experiments and finite element modeling were carried out for two designs of two- and four-position single-turn coils, which were made to process several workpieces in one current pulse. The main parameters measured and calculated were the magnetic field between the coil and the workpiece, and the ratio of its amplitude to the discharge current, Bm/Im. The currents flowing through the coils were about 700 kA, which correspond to the magnetic fields of 40–45 T. The FEM modeling revealed a 17–19% drop of the magnetic induction near the insulated slit, which, however, did not prevent the helium-tight joining of the tubes to the end plugs

Possible Strategies for the Implementation of who Program on the Elimination of Hepatitis C in Ukraine by 2030

Introduction. The article describes the model of natural history of hepatitis C virus the use of which makes it possible to assess the dynamics of the infected population from 2015 to 2030 in natural history and under the influence of the strategies of antiviral therapy, namely, the changes in the number of infected populations, the progression of the diseases, patients’ proportion with different stages of fibrosis and also the mortality which is associated with final stages of liver disease. In addition, there are estimated data on the number of the patients that are subject to annual diagnosing for treatment in accordance with specific therapy strategies which is necessary to achieve the results provided by the WHO program for the elimination of hepatitis C virus in Ukraine by 2030. Material and method. The study included 897 patients with chronic hepatitis C virus in whom the activity and stage of the disease were determined by liver biopsy or non-invasive tests (FibroTest, FibroTest / ActiTest, FibroMax). All the patients were divided by sex and age into the age groups with a 5-year interval: from 0 to 4 years, 5-9, 10-14, 15-19, 20-24, 25-29, 30-34, 35-39 , 40-44, 45-49, 50-54, 55-59, 60-64, 65-69, 70-74, 75 and more years. Results. According to the model of natural history of hepatitis C virus the number of the infected population in Ukraine should be reduced by 30% by 2030 of which 80% of the patients will die from decompensated LC and HCC. To reduce the mortality from final stages of liver disease 42.2% of the infected population should be treated according to selected therapy strategies. In this connection from 2016 to 2030 it is necessary to identify 65% and 77% of the patients with fibrosis stages F0-F4 for Strategies No. 1 and 2 respectively. Conclusion. To reduce the mortality from decompensated cirrhosis and hepatocellular carcinoma it’s necessary to treat 42.2% of the infected population according to selected treatment strategies. To treat the required number of the patients according to Strategies No. 1 and 2 it is necessary to identify 65% and 77% of the patients from the estimated number of infected populations respectively. Keywords: hepatitis C virus, natural history of hepatitis C virus, elimination of hepatitis C virus, mathematical modeling, fibrosis stage, therapy strategies, population prediction

Calculation of the moscovium ground-state energy by quantum algorithms

We investigate the possibility to calculate the ground-state energy of the atomic systems on a quantum computer. For this purpose we evaluate the lowest binding energy of the moscovium atom with the use of the iterative phase estimation and variational quantum eigensolver. The calculations by the variational quantum eigensolver are performed with a disentangled unitary coupled cluster ansatz and with various types of hardware-efficient ansatze. The optimization is performed with the use of the Adam and Quantum Natural Gradients procedures. The scalability of the ansatze and optimizers is tested by increasing the size of the basis set and the number of active electrons. The number of gates required for the iterative phase estimation and variational quantum eigensolver is also estimated.Comment: 29 pages, 5 figure

Nucleon-nucleon interaction in the JJ-matrix inverse scattering approach and few-nucleon systems

The nucleon-nucleon interaction is constructed by means of the $J$-matrix version of inverse scattering theory. Ambiguities of the interaction are eliminated by postulating tridiagonal and quasi-tridiagonal forms of the potential matrix in the oscillator basis in uncoupled and coupled waves, respectively. The obtained interaction is very accurate in reproducing the $NN$ scattering data and deuteron properties. The interaction is used in the no-core shell model calculations of $^3$H and $^4$He nuclei. The resulting binding energies of $^3$H and $^4$He are very close to experimental values.Comment: Text is revised, new figures and references adde