CHOICE OF CONDITIONS FOR GAS OUTFLOW IN VACUUM AND CONFIGURATIONS OF A FORMING UNIT FEEDING A WORKING SUBSTANCE INTO THE PLASMA VOLUME

The paper presents formulated requirements to the gas-dynamic device designed for working substance feeding into the ionization zone of plasmas facilities. The role of geometrical factors in formation of a supersonic flow is determined, as well as, the role of gasdynamic factors in attainment of necessary parameters beyond the forming element. The conditions for gas-dynamic flow clustering minimization in the course of outflow in vacuum

International trends in the justice digitalization development

The authors substantiate the feasibility of introducing digital technology into the modern system of administration of justice. It is noted that the introduction of digital technologies will reduce the time for disposal of legal proceedings, create an independent, but at the same time transparent judicial system, improve the quality of decisions taken by the court and the level of public confidence in the state, and minimize government spending in this are

First-principles study of structural, electronic and thermodynamic properties of (ZnO)n_n(n=2-16) clusters

The structural, electronic, and vibrational thermodynamic properties of the (ZnO)$_n$ (n=2-16) clusters are studied using density functional - full potential computations. The results show, small clusters up to $n=9$ stabilize in the 2D ring shape geometries while the larger clusters prefer the 3D cage like structures. The ring to cage structural cross over in ZnO clusters is studied by investigating the behavior of the Zn-O-Zn bond angle, the Zn-O bond strength, and the number of bonds in the systems. It is argued that 12 is the lowest magic number of ZnO clusters at ground state, while finite temperature vibrational excitations enhance the relative stability of the (ZnO)$_9$ cluster and make it a magic system at temperatures above about 170 K. The obtained electronic structure of ZnO clusters before and after applying the many-body GW corrections evidence a size induced red shift originated from the ring to cage structural cross over in these systems. The behavior of the extremal points of electron density of the clusters along with the extrapolated cluster binding energies at very large sizes may be evidences for existence of a metastable structure for large ZnO nanostructures, different with the bulk ZnO structure.Comment: 8 pages, 8 figures and 1 tabl

Effect of cold rolling on microstructure and mechanical properties of a Cast TiNbZr-based composite reinforced with borides

The TiNbZr/(Ti, Nb)B metal matrix composite with 2.5 vol.% of borides was produced by vacuum arc melting. The composite was then cold-rolled to thickness strains of 10, 20, 50, or 80%. In the initial condition, the composite had a network-like microstructure consisting of the soft TiNbZr matrix (dendrites) and the rigid (Ti, Nb)B shell (interdendritic space

Assessment of needs in orthopedic treatment of patients of an older age group

The article describes the statistical data obtained during the examination of the oral cavity and the analysis of medical records of patients older than 75 years with various somatic pathologies who were treated in the central city hospital No. 7 of the city of YekaterinburgВ статье описаны статистические данные, полученные в ходе осмотра полости рта и анализа клинической картины потери зубов пациентов старше 75 лет с различной соматической патологией, проходивших лечение в центральной городской больнице №7 города Екатеринбурга

ТЕМПЕРАТУРНІ РЕЖИМИ ЗОН ЗВОРОТНИХ ТОКІВ У БЛИЖНЬОМУ СЛІДІ ЦИЛІНДРИЧНИХ СТАБІЛІЗАТОРІВ ПОЛУМ'Я

The results of experimental studies of the temperature regimes of the back flow zones behind the cylindrical flame stabilizers of microjet burners are presented. The authors have considered a burner device, which is a circular channel with a cylindrical stabilizer placed in it. Circular openings for feeding fuel gas (propane-butane) into the blowing air flow off are located in a circle on the stabilizer. To determine the sizes of the back flow zones in the regions astern of the stabilizer, a method of visualizing the flow using sodium salts was used. The temperature measurement in the back flow zone was carried out by the chromel-alumel thermocouple. The regularities of the influence on the length of the back flows zones and the temperatures in these zones of such regime parameters of the combustion process as the value of the air flow velocity at the inlet to the channel and the air excess coefficient are analysed. Particular attention is paid to the study of the features of the change in the heat state and the length of the back flow zones as a function of the magnitude of the relative pitch of disposition of the gas-supply openings. An increase in the relative pitch of the gas-supplying openings and the air excess coefficient is shown to lead to a decrease in the length of the back flow zones, and an increase in the airflow velocity, on the contrary, increases this length. The influence of the relative pitch of disposition of the gas is noted to supply openings related to the fact that its growth leads to an increase in the injecting action of the fuel gas jets, which consists in a greater attraction of ambient air to the fuel jets. This in turn leads to an additional increase in the degree of rarefaction in the back flows zone beyond the stabilizer, and then to a decrease in the length of this zone. The dependence of the length of the back flow zone on the magnitude of the relative pitch of the gas supply openings is observed to be significant only at relatively high values of the air excess coefficient. With an increase in this pitch and the air-flow velocity, the maximum values of the temperatures are defined to increase. An increase in the air excess coefficient is considered to lead to a drop in maximum temperatures in the back flows zone. The results of the completed studies can be used in energy practice in the design of burner devices for fuel combustion equipment with relatively low power, when it is necessary to ensure the uniformity of heat supply over the fire space.Наведено результати експериментальних досліджень теплового стану мікрофакельних пальникових пристроїв з циліндричними стабілізаторами полум'я. Встановлено особливості формування температурних режимів і геометричних характеристик зон зворотних токів у закормовій ділянці циліндричних стабілізаторів. Проаналізовано закономірності впливу конструктивних і режимних чинників на основні параметри процесу спалювання в розглядуваних пальникових пристроях. Наведено дані щодо залежності довжини зон зворотних токів у закормових ділянках циліндричних стабілізаторів полум'я та величини температур у них від таких режимних параметрів процесу спалювання, як величина швидкості потоку повітря на вході в канал і коефіцієнт надлишку повітря. Встановлено, що зі збільшенням швидкості повітряного потоку протяжність зони зворотних токів зростає, вплив же коефіцієнта надлишку повітря має протилежний характер: довжина зони зворотних токів і рівень температур у них зменшуються зі зростанням коефіцієнта надлишку повітря. Певну увагу приділено дослідженню особливостей зміни теплового стану і протяжності зон зворотних токів за стабілізаторами полум'я від величини відносного кроку розташування газоподавальних отворів. Зазначено, що з огляду на інжектуючу дію струмин паливного газу відбувається скорочення довжини зон зворотних токів зі збільшенням вказаного відносного кроку

The magnetic ordering in the mixed valence compound beta-Na0.33V2O5

The low-temperature electron spin resonance (ESR) spectra and the static magnetization data obtained for the stoichiometric single crystals of $\beta$-Na$_{0.33}$V$_2$O$_5$ indicate that this quasi-one-dimensional mixed valence (V4+/V5+) compound demonstrates at $T_N=22$ K the phase transition into the canted antiferromagnetically ordered state. The spontaneous magnetization of $3.4\times 10^{-3}$ $\mu_B$ per V$^{4+}$ ion was found to be oriented along the two-fold $b$ axis of the monoclinic structure, the vector of antiferromagnetism is aligned with the $a$ axis and the Dzyaloshinsky vector is parallel to the $c$-axis. The experimental data were successfully described in the frame of the macroscopic spin dynamics and the following values for the macroscopic parameters of the spin system were obtained: the Dzyaloshinsky field $H_D=6$ kOe, the energy gaps of two branches of the spin wave spectrum $\Delta_1=48$ GHz and $\Delta_2=24$ GHz.Comment: 5 pages, 6 figure

Search for Doubly-Charged Higgs Boson Production at HERA

A search for the single production of doubly-charged Higgs bosons H^{\pm \pm} in ep collisions is presented. The signal is searched for via the Higgs decays into a high mass pair of same charge leptons, one of them being an electron. The analysis uses up to 118 pb^{-1} of ep data collected by the H1 experiment at HERA. No evidence for doubly-charged Higgs production is observed and mass dependent upper limits are derived on the Yukawa couplings h_{el} of the Higgs boson to an electron-lepton pair. Assuming that the doubly-charged Higgs only decays into an electron and a muon via a coupling of electromagnetic strength h_{e \mu} = \sqrt{4 \pi \alpha_{em}} = 0.3, a lower limit of 141 GeV on the H^{\pm\pm} mass is obtained at the 95% confidence level. For a doubly-charged Higgs decaying only into an electron and a tau and a coupling h_{e\tau} = 0.3, masses below 112 GeV are ruled out.Comment: 15 pages, 3 figures, 1 tabl