Искусственное возбуждение феррорезонанса для испытания повышенным напряжением электротехнического оборудования в распределительных устройствах

On the basis of the developed device for protection against of ferro-resonant and high-frequency cumulative over-voltages an algorithm for obtaining a voltage imitating ferro-resonant over-voltages is proposed in the paper. This algorithm presupposes to apply a voltage to the secondary transformer side from an extraneous source is proposed.   На основе разработанного устройства защиты от феррорезонансных и высокочастотных кумулятивных перенапряжений предложен алгоритм получения напряжения, имитирующего феррорезонансные перенапряжения, заключающегося в подаче на вторичную сторону трансформатора напряжения от постороннего источника

Взрывные процессы на катоде при формировании наносекундного импульсного разряда высокого напряжения

The paper is devoted to research of cathode surfaces with different curvature radius (r = 1–8 mm) while forming nanosecond pulsed discharge in dense air. Influence of field and air pressure heterogeneity rate in gas gap on size of micro-craters being formed on working cathode surface after pulsed effect has been shown in the paper. The paper reveals a maximum expansion of separate micro-crater size on cathode surface with small curvature radius.Настоящая статья посвящена исследованиям поверхности катодов с различным радиусом кривизны (r = 1–8 мм) при формировании импульсных разрядов наносекундной длительности в плотном воздухе. Показано влияние степени неоднородности поля и давления воздуха в газовом промежутке на размеры микрократеров, образующихся на рабочей поверхности электрода после импульсного воздействия. Выявлено наибольшее увеличение размеров отдельных микрократеров на поверхности катода с малым радиусом кривизны

Ocena warunków odwodnień na terenach nawadnianych w Republice Azerbejdżanu

Current reclamation condition of lands in the Azerbaijan Republic and differential assessment of saline soils depending on the soil characteristics (chemistry, soil texture etc.) are described in this paper.Praca zawiera omówienie specyficznych warunków prowadzenia nawodnień i odwodnień gleb iłowych na terenie Republiki Azerbejdżanu. Przedstawiona została zmodyfikowana klasyfikacja zasolenia gleb, która z większą precyzją pozwala na ocenę możliwości i potrzebę prowadzenia prac odwodnieniowych

Suppression of Ferroresonance in Switch Gears with Voltage Transformer and Reduction of Cumulative Overvoltages

The paper contains an algorithm for numerical experiment and computer modelling of ferroresonance and switching overvoltages having cumulative character and protection against these overvoltages. Possibilities of the proposed algorithm are illustrated with restriction of both overvoltages by means of a common device which is based on voltage supply to secondary winding of a voltage transformer from an auxiliary source of a switch-gear

Structure and thermal analysis of Ba<inf>0.5</inf> La<inf>0.5</inf> MnO<inf>3</inf> polycrystalline powder

© 2019 World Scientific Publishing Company. The structure and thermal properties of Ba0.5La0.5MnO3 polycrystalline powder have been investigated using X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) techniques. The structural studies have shown that Ba0.5La0.5MnO3 compound crystallizes in perovskite structure with Pm-3m cubic symmetry group. The lattice parameters were obtained to be a = b = c = 3.9073 Å. Mass changes have been observed from thermogravimetric (TG) and differential thermogravimetric (DTG) curves obtained in a wide temperature interval of 30-950°C. Free energy and enthalpy changes for all observed transformations were determined. Observed endo and exo effects

ATLAS

% ATLAS \\ \\ ATLAS is a general-purpose experiment for recording proton-proton collisions at LHC. The ATLAS collaboration consists of 144 participating institutions (June 1998) with more than 1750~physicists and engineers (700 from non-Member States). The detector design has been optimized to cover the largest possible range of LHC physics: searches for Higgs bosons and alternative schemes for the spontaneous symmetry-breaking mechanism; searches for supersymmetric particles, new gauge bosons, leptoquarks, and quark and lepton compositeness indicating extensions to the Standard Model and new physics beyond it; studies of the origin of CP violation via high-precision measurements of CP-violating B-decays; high-precision measurements of the third quark family such as the top-quark mass and decay properties, rare decays of B-hadrons, spectroscopy of rare B-hadrons, and $B ^0 _{s}$-mixing. \\ \\The ATLAS dectector, shown in the Figure includes an inner tracking detector inside a 2~T~solenoid providing an axial field, electromagnetic and hadronic calorimeters outside the solenoid and in the forward regions, and barrel and end-cap air-core-toroid muon spectrometers. The precision measurements for photons, electrons, muons and hadrons, and identification of photons, electrons, muons, $\tau$-leptons and b-quark jets are performed over $| \eta |$ < 2.5. The complete hadronic energy measurement extends over $| \eta |$ < 4.7. \\ \\The inner tracking detector consists of straw drift tubes interleaved with transition radiators for robust pattern recognition and electron identification, and several layers of semiconductor strip and pixel detectors providing high-precision space points. \\ \\The e.m. calorimeter is a lead-Liquid Argon sampling calorimeter with an integrated preshower detector and a presampler layer immediately behind the cryostat wall for energy recovery. The end-cap hadronic calorimeters also use Liquid Argon technology, with copper absorber plates. The end-cap cryostats house the e.m., hadronic and forward calorimeters (tungsten-Liquid Argon sampling). The barrel hadronic calorimeter is an iron-scintillating tile sampling calorimeter with longitudinal tile geometry. \\ \\Air-core toroids are used for the muon spectrometer. Eight superconducting coils with warm voussoirs are used in the barrel region complemented with superconducting end-cap toroids in the forward regions. The toroids will be instrumented with Monitored Drift Tubes (Cathode Strip Chambers at large rapidity where there are high radiation levels). The muon trigger and second coordinate measurement for muon tracks are provide