Structure And Properties of Nanoparticles Formed under Conditions of Wire Electrical Explosion

Structure and properties of nanoparticles formed under conditions of wire electrical explosion were studied. It was shown that the state of WEE power particles can be characterized as a metastable state. It leads to an increased stability of nanopowders at normal temperatures and an increased reactivity during heating, which is revealed in the form of threshold phenomena.Comment: Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions

SEM-investigating microstructure of cast AlNiCuFeCo high entropy alloys formations a liquid-phase separation

The equipment of the Ural Center for Shared Use “Modern nanotechnology” Ural Federal University was used

SEM investigation of the microstructure of cast CuNiAlCoFe equiatomic high entropy alloy

Microheterogeneity and crystallization conditions of the equiatomic high-entropy CuNiAlCoFe alloy were studied by measuring the viscosity during heating/cooling, as well as visualizing the microstructure after solidification. The CuNiAlCoFe liquid alloy showed different temperature dependences of viscosity upon heating to 2070 K and subsequent cooling. Since the coinciding part of the temperature dependences was absent, complete destruction of the microheterogeneity of the melt after heating to 2070 K did not occur. Heating the melt to higher temperatures was not possible due to the evaporation of the metal. The melt viscosity during cooling is higher than that during heating; this is observed when microheterogeneity is dispersed. The CuNiAlCoFe alloy obtained as a result of the experiment at a crystallization rate of 10 K/s had a typical microstructure of cast dendrite. Dendrites consisted of a eutectic (α-Al+CuAl2+Cu4NiAl7) and included primary crystals of CoCu2Al7 and FeCu2Al7. The interdendritic space contained small Cu4NiAl7 crystals. © Published under licence by IOP Publishing Ltd

АНАЛІЗ ПОЛІМОРФІЗМІВ ГЕНІВ АСЕ, ACTN3, ENOS, PPARG, PPARA, HIF-1Α, PPARGC1B ПРИ ВИЗНАЧЕННІ СПАДКОВОЇ СХИЛЬНОСТІ ДО РІЗНИХ ВИДІВ СПОРТУ

To establishing the possibility of assessing genetic iinherited predisposition to various sports, the differences in the distribution of genotypes of the complex polymorphisms in groups of athletes, specializing in sports with different types of energy supply of muscular work were studied. The paper examined the DNA 332 persons, of which 110 athletes involved in speed- power sports, 85 - in endurance sports , 51 - in sports that require a combination of strength and endurance, 86 - with no experience regular exercise.C целью установления возможности оценки наследственной предрасположенности к занятиям различными видами спорта, изучены различия в распределении генотипов по комплексу полиморфизмов в группах спортсменов, специализирующихся в видах спорта с разным характером энергообеспечения мышечной работы. В работе обследовано ДНК 332 лиц, из которых: 110 спортсменов, занимающихся скоростно-силовыми видами спорта, 85 - видами спорта з перимущественным развитием выносливости, 51 - видами спорта, требующими сочетанногопроявления силы и выносливости, 86 - не имеющих стажа регулярних занятий спортом.З метою встановлення можливості оцінки спадкової схильності до занять різними видами спорту вивчено відмінності у розподілі генотипів за комплексом поліморфізмів у групах спортсменів, які спеціалізуються у видах спорту з різним характером енергозабезпечення м’язової роботи. Використовуючи комплексний аналіз поліморфізмів генів та метод мультифакторної просторової редукції, створено моделі міжгенної взаємодії при оцінці схильності до швидкісно-силових видів спорту та видів спорту з вимогами поєднаної дії сили та витривалості. Встановлено, що І/D поліморфізм гена ACE, Т-786→С поліморфізм гена еNOS, R577X поліморфізму гена ACTN3, G/C поліморфізму 7-го інтрона гена PPARA є інформативними маркерами для визначення спадкової схильності до прояву високої фізичної працездатності у швидкісно-силових видах спорту, а Т-786→С поліморфізм гена еNOS є маркером схильності до занять видами спорту з вимогами поєднаної дії сили та витривалості

A Search for leptophilic Z_(l) boson at future linear colliders

We study the possible dynamics associated with leptonic charge in future linear colliders. Leptophilic massive vector boson, Z_(l), have been investigated through the process e^(+)e^(-) -> mu^(+)mu^(-). We have shown that ILC and CLIC will give opportunity to observe Z_(l) with masses up to the center of mass energy if the corresponding coupling constant g_(l) exceeds 10^(-3).Comment: 12 pages, 10 figure

Hamiltonian and Linear-Space Structure for Damped Oscillators: I. General Theory

The phase space of $N$ damped linear oscillators is endowed with a bilinear map under which the evolution operator is symmetric. This analog of self-adjointness allows properties familiar from conservative systems to be recovered, e.g., eigenvectors are "orthogonal" under the bilinear map and obey sum rules, initial-value problems are readily solved and perturbation theory applies to the_complex_ eigenvalues. These concepts are conveniently represented in a biorthogonal basis.Comment: REVTeX4, 10pp., 1 PS figure. N.B.: `Alec' is my first name, `Maassen van den Brink' my family name. v2: extensive streamlinin

Summary of the SUSY Working Group of the 1999 Les Houches Workshop

The results obtained by the Working Group on Supersymmetry at the 1999 Les Houches Workshop on Collider Physics are summarized. Separate chapters treat "general" supersymmetry, R-parity violation, gauge mediated supersymmetry breaking, and anomaly mediated supersymmetry breaking.Comment: LaTeX, 110 pages with numerous .ps and .eps files. proc.tex is main tex fil

Pulsation in the atmosphere of the roAp star HD 24712. I. Spectroscopic observations and radial velocity measurements

We have investigated the structure of the pulsating atmosphere of one of the best studied rapidly oscillating Ap stars, HD 24712. For this purpose we analyzed spectra collected during 2001-2004. An extensive data set was obtained in 2004 simultaneously with the photometry of the Canadian MOST mini-satellite. This allows us to connect directly atmospheric dynamics observed as radial velocity variations with light variations seen in photometry. We directly derived for the first time and for different chemical elements, respectively ions, phase shifts between photometric and radial velocity pulsation maxima indicating, as we suggest, different line formation depths in the atmosphere. This allowed us to estimate for the first time the propagation velocity of a pulsation wave in the outer stellar atmosphere of a roAp star to be slightly lower than the sound speed. We confirm large pulsation amplitudes (150-400 m/s) for REE lines and the Halpha core, while spectral lines of the other elements (Mg, Si, Ca, and Fe-peak elements) have nearly constant velocities. We did not find different pulsation amplitudes and phases for the lines of rare-earth elements before and after the Balmer jump, which supports the hypothesis of REE concentration in the upper atmosphere above the hydrogen line-forming layers. We also discuss radial velocity amplitudes and phases measured for individual spectral lines as tools for a 3D tomography of the atmosphere of HD 24712.Comment: accepted by A&

Statistical Mechanics of Glass Formation in Molecular Liquids with OTP as an Example

We extend our statistical mechanical theory of the glass transition from examples consisting of point particles to molecular liquids with internal degrees of freedom. As before, the fundamental assertion is that super-cooled liquids are ergodic, although becoming very viscous at lower temperatures, and are therefore describable in principle by statistical mechanics. The theory is based on analyzing the local neighborhoods of each molecule, and a statistical mechanical weight is assigned to every possible local organization. This results in an approximate theory that is in very good agreement with simulations regarding both thermodynamical and dynamical properties