Motion of a cylinder rigid body interacting with point vortices

The dynamical behavior of a heavy circular cylinder and N point vortices in an ideal liquid is considered. The governing equations are presented in Hamiltonian form. Integrals of motion are found. Allowable types of trajectories are discussed. The stability of finding equilibrium solutions is investigated and some remarkable types of partial solutions of the system are presented. The system demonstrate chaotic behavior of dynamics

Investigation of Microstructure of Oxygen-Containing Copper

The results of the study of fine structure of continuous casted bars of oxygen-containing copper produced by casting in the belt water-cooled crystallizer are presented. The character of fractures of samples of copper cast bars in different directions depending on technological parameters of continuous casting was investigated. For determination of chemical composition of samples of cast bars and detection of presence of possible impurities in copper the microspectral analysis was carried out. It is shown that removing of sources of gasing of copper melt leads to decreasing of volume fraction of eutectic Cu-Cu2O, discontinuity flaws and pores in the structure of cast bars.     Keywords: Copper, Continuos casting, Rolling, Rolled wire, Contirod method, Microstructure, Fracture, Microspectral analysis

Обоснование способов интенсификации выщелачивания медьсодержащего минерального сырья с позиции модели Лоренца

Based on the experiment and its interpretation in the framework of Lorenz model the ways of intensification of leaching copper from the poor mineral raw have been proposed.На основе эксперимента и его интерпретации в рамках модели Лоренца предложены способы интенсификации выщелачивания меди из бедного минерального сырья

До питання про фазові переходи першого роду в ортоферитах

On the example of first-order phase transitions in orthoferrites under the influence of an external magnetic field is shown the effectiveness of the application of the Landau theory of phase transitions, commonly used in second-order phase transitions. This is especially important when used Hamiltonian is a function of many variables.На прикладі фазових переходів першого роду в ортоферитах під впливом зовнішнього магнітного поля показано результативність застосування теорії фазових переходів Ландау, що зазвичай використовуються при фазових переходах другого роду. Особливо це важливо, коли використовуваний гамільтоніан є функцією багатьох змінних

On possibility of measurement of the electron beam energy using absorption of radiation by electrons in a magnetic field

The possibility of the precise measurement of the electron beam energy using absorption of radiation by electrons in a static and homogeneous magnetic field in a range up to a few hundred GeV energies, was considered in [1]. With the purpose of experimental checking of this method in a range of several tens MeV energies, the possibility of measurement of absolute energy of the electron beam energy with relative accuracy up to 10^{-4} is examined in details.Comment: 14 pages, 10 figure

Casimir energy in multiply connected static hyperbolic Universes

We generalize a previously obtained result, for the case of a few other static hyperbolic universes with manifolds of nontrivial topology as spatial sections.Comment: accepted for publicatio

Measurement of RudsR_{\text{uds}} and RR between 3.12 and 3.72 GeV at the KEDR detector

Using the KEDR detector at the VEPP-4M $e^+e^-$ collider, we have measured the values of $R_{\text{uds}}$ and $R$ at seven points of the center-of-mass energy between 3.12 and 3.72 GeV. The total achieved accuracy is about or better than $3.3\%$ at most of energy points with a systematic uncertainty of about $2.1\%$. At the moment it is the most accurate measurement of $R(s)$ in this energy range

Landscape equivalent of the shoving model

It is shown that the shoving model expression for the average relaxation time of viscous liquids follows largely from a classical "landscape" estimation of barrier heights from curvature at energy minima. The activation energy involves both instantaneous bulk and shear moduli, but the bulk modulus contributes less than 8% to the temperature dependence of the activation energy. This reflects the fact that the physics of the two models are closely related.Comment: 4 page

Mineral insulators for kompton detectors of neutrons with a metal hafnium emitter

One of the priority tasks of nuclear power industry is to increase the reliability and safety of nuclear power plants. In this regard, traditional detectors for measuring the neutron flux in the reactor core are being improved and new ones are developed. This work is dedicated to one of the tasks of creating a compton self-powered neutron detector, namely, the formation of an insulator of magnesium oxide on an emitter of metallic hafnium. The effect of three types of magnesium oxide of different purity and structural state, as well as annealing temperature on the electrical resistance of the insulator between the collector and the emitter of the detector, is studied. The detector prototypes were manufactured by filling with magnesium oxidepowders or by applying liquid-phase mixturesthereof.Одним з пріоритетних завдань атомної енергетики є підвищення надійності та безпеки ядерноенергетичних блоків. З цією метою вдосконалюються та розробляються нові датчики для вимірювання потоку нейтронів в активній зоні реактора. Дана робота присвячена дослідженню магнію оксиду як ізолятора в комптоновських детекторах прямого заряду з емітером з металевого гафнію. Досліджено вплив трьох видів магнію оксиду різного за чистотою та структурою, а також температури відпалу на електроопір ізолятора між колектором та емітером детектора. Виготовлена ізоляція дослідженних зразків детектора щляхом насипу та нанесенням рідкофазної магнієвої суміші.Одна из наиболее приоритетных задач атомной энергетики – повышение надежности и безопасности ядерно-энергетических установок. В связи с этим совершенствуются и разрабатываются новые датчики измерения потока нейтронов в активной зоне реактора. Данная работа посвящена одному из этапов создания комптоновского детектора прямого заряда, а именно формированию изолятора из окиси магния на эмиттере из металлического гафния. Исследовано влияние трех видов оксида магния различной чистоты и структурного состояния, а также температуры отжига на электросопротивление изолятора между коллектором и эмиттером детектора. Изготовлены опытные образцы детекторов методами засыпки и нанесения жидкофазной смеси оксида магния

Search for narrow resonances in e+ e- annihilation between 1.85 and 3.1 GeV with the KEDR Detector

We report results of a search for narrow resonances in e+ e- annihilation at center-of-mass energies between 1.85 and 3.1 GeV performed with the KEDR detector at the VEPP-4M e+ e- collider. The upper limit on the leptonic width of a narrow resonance Gamma(R -> ee) Br(R -> hadr) < 120 eV has been obtained (at 90 % C.L.)