Effect of the lower hybrid heating on the confinement of high energy ions in stellarators

In a stellarator-type device, the effect of the lower hybrid (LH) heating on the ion confinement is investigated. For this purpose, the motion of high energy ions is simulated numerically in the Large Helical Device, as an example of such a device. It is shown that owing to LH heating, initially well-confined particles are expelled from the plasma in time less then the ion-electron collisional time. Therefore, it is possible to use this method of heating for helium ash removal in a stellarator-reactor

Показники протеїн-ліпідного обміну за гепатостеатозу

Our previous experimental data have shown that some indices of lipid metabolism are increased under conditions of development alcohol-induced hepatic steatosis. There are distractive changes metabolic processes (especially lipid and protein metabolism) caused by alcohol. There are some publications about S-containing bioprotectors influence on organism, those works are under discussion.This work is devoted to the study of changes of some indices of protein-lipid metabolism in the blood of rats with alcohol-induced hepatic steatosis and after treatment of S-containing biological protector betaine.One of the main indicators of the development of alcohol-induced hepatic steatosis is the increasing activity of γ-glutamyltransferase. Under the conditions of alcohol-induced hepatic steatosis in the blood serum of rats, the activity of GGT increases in 3 times, and at the same time, the using bioprotector decreases enzymatic activity to the level of control.Changes in the activity of GGT are in direct correlation with changes in levels of bilirubin, triacylglycerol and cholesterol levels.The study of the effect of Sulfur-containing bioprotector requires a more detailed investigation of metabolic processes in the animal organism, especially protein-lipid metabolism, in order to correct pathological deviations caused by alcohol-induced hepatic steatosis. Експериментальні дані наших попередніх робіт засвідчили, що в умовах розвитку алкоголь-індукованого гепатостеатозу спостерігається зростання окремих показників ліпідного обміну. Метаболічні процеси (особливо ліпідного та білкового обміну) зазнають деструктивних змін, які спричиняються алкоголем. Поряд з цим опубліковано ряд публікацій про вплив на організм біологічних протекторів, які містять S, а представлені в них експериментальні дані є неоднозначними й дискусійними .Дана робота присвячена вивченню змін деяких показників білково-ліпідного обміну в крові щурів із алкоголь-індукованим гепатостетозом та після вживання тваринами S-вмісного біоактивного бетаїну.Одним з головних показників розвитку алкоголь-індукованого гепатостетозу є підвищення активності γ-глутамілтрансферази. В умовах алкоголь-індукованого стеатозу печінки у сироватці крові щурів активність  збільшується в 3 рази, і в той же час використання біопротектора знижує ферментативну активність до рівня контролю. Зміна активності γ-глутамілтрансферази знаходиться в прямій кореляції зі змінами рівнів білірубіну, триацилгліцеролів і холестеролу.Дослідження біологічного ефекту Сульфур-вмісних протекторів потребує детальнішого вивчення метаболічних процесів у організмі тварин, особливо білково-ліпідного метаболізму, для виправлення патологічних відхилень, спричинених алкоголь- індукованим гепатостеатозом.

Расчет гашения обратного напряжения в импульсной схеме

Grid and e-science infrastructure interoperability is an increasing demand for Grid applications but interoperability based on common open standards adopted by Grid middle-wares are only starting to emerge on Grid infrastructures and are not broadly provided today. In earlier work we have shown how open standards can be improved by lessons learned from cross-Grid applications that require access to both, High Throughput Computing (HTC) resources as well as High Performance Computing (HPC) resources. This paper provides more insights in several concepts with a particular focus on effectively describing Grid job descriptions in order to satisfy the demands of e-scientists and their cross-Grid applications. Based on lessons learned over years gained with interoperability setups between production Grids such as EGEE, DEISA, and NorduGrid, we illustrate how common open Grid standards (i.e. JSDL and GLUE2) can take cross-Grid application experience into account

Effects of plasma heating on the magnitude and distribution of plasma flows in the helical divertor of the Uragan-3M torsatron

Recently, a strong up-down asymmetry in the poloidal distributions of diverted plasma flows has been observed in the l = 3/m = 9 Uragan-3M torsatron, in many features similar to what have been observed in the l = 2 Heliotron E heliotron/torsatron. With this asymmetry, the predominant outflow of the diverted plasma is directed with the ion toroidal drift. On this basis, the asymmetry can be related to the space non-uniformity of the charged particle loss. In the work reported, the magnitude of divertor flow in U-3M and the vertical asymmetry in its distribution are studied as functions of the heating parameter P/, P being the power absorbed in the plasma, and are juxtaposed with corresponding P-related changes in the density and fast ion content in the plasma. As P/ increases, an increase of fast ion content and of particle loss, on the one hand, and an increase of divertor flow magnitude and of vertical asymmetry of the flow, on the other hand, are observed. A mutual accordance between these processes validates the hypothesis on a dominating role of fast particle loss in formation of vertical asymmetry of divertor flows in helical devices

Search for charginos in e+e- interactions at sqrt(s) = 189 GeV

An update of the searches for charginos and gravitinos is presented, based on a data sample corresponding to the 158 pb^{-1} recorded by the DELPHI detector in 1998, at a centre-of-mass energy of 189 GeV. No evidence for a signal was found. The lower mass limits are 4-5 GeV/c^2 higher than those obtained at a centre-of-mass energy of 183 GeV. The (\mu,M_2) MSSM domain excluded by combining the chargino searches with neutralino searches at the Z resonance implies a limit on the mass of the lightest neutralino which, for a heavy sneutrino, is constrained to be above 31.0 GeV/c^2 for tan(beta) \geq 1.Comment: 22 pages, 8 figure

Search for displaced vertices arising from decays of new heavy particles in 7 TeV pp collisions at ATLAS

We present the results of a search for new, heavy particles that decay at a significant distance from their production point into a final state containing charged hadrons in association with a high-momentum muon. The search is conducted in a pp-collision data sample with a center-of-mass energy of 7 TeV and an integrated luminosity of 33 pb^-1 collected in 2010 by the ATLAS detector operating at the Large Hadron Collider. Production of such particles is expected in various scenarios of physics beyond the standard model. We observe no signal and place limits on the production cross-section of supersymmetric particles in an R-parity-violating scenario as a function of the neutralino lifetime. Limits are presented for different squark and neutralino masses, enabling extension of the limits to a variety of other models.Comment: 8 pages plus author list (20 pages total), 8 figures, 1 table, final version to appear in Physics Letters

Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at sqrt(s) = 7 TeV with the ATLAS experiment

This paper describes an analysis of the angular distribution of W->enu and W->munu decays, using data from pp collisions at sqrt(s) = 7 TeV recorded with the ATLAS detector at the LHC in 2010, corresponding to an integrated luminosity of about 35 pb^-1. Using the decay lepton transverse momentum and the missing transverse energy, the W decay angular distribution projected onto the transverse plane is obtained and analysed in terms of helicity fractions f0, fL and fR over two ranges of W transverse momentum (ptw): 35 < ptw < 50 GeV and ptw > 50 GeV. Good agreement is found with theoretical predictions. For ptw > 50 GeV, the values of f0 and fL-fR, averaged over charge and lepton flavour, are measured to be : f0 = 0.127 +/- 0.030 +/- 0.108 and fL-fR = 0.252 +/- 0.017 +/- 0.030, where the first uncertainties are statistical, and the second include all systematic effects.Comment: 19 pages plus author list (34 pages total), 9 figures, 11 tables, revised author list, matches European Journal of Physics C versio

Observation of a new chi_b state in radiative transitions to Upsilon(1S) and Upsilon(2S) at ATLAS

The chi_b(nP) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider (LHC) at sqrt(s) = 7 TeV and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of 4.4 fb^-1, these states are reconstructed through their radiative decays to Upsilon(1S,2S) with Upsilon->mu+mu-. In addition to the mass peaks corresponding to the decay modes chi_b(1P,2P)->Upsilon(1S)gamma, a new structure centered at a mass of 10.530+/-0.005 (stat.)+/-0.009 (syst.) GeV is also observed, in both the Upsilon(1S)gamma and Upsilon(2S)gamma decay modes. This is interpreted as the chi_b(3P) system.Comment: 5 pages plus author list (18 pages total), 2 figures, 1 table, corrected author list, matches final version in Physical Review Letter

Measurement of the inclusive isolated prompt photon cross-section in pp collisions at sqrt(s)= 7 TeV using 35 pb-1 of ATLAS data

A measurement of the differential cross-section for the inclusive production of isolated prompt photons in pp collisions at a center-of-mass energy sqrt(s) = 7 TeV is presented. The measurement covers the pseudorapidity ranges |eta|<1.37 and 1.52<=|eta|<2.37 in the transverse energy range 45<=E_T<400GeV. The results are based on an integrated luminosity of 35 pb-1, collected with the ATLAS detector at the LHC. The yields of the signal photons are measured using a data-driven technique, based on the observed distribution of the hadronic energy in a narrow cone around the photon candidate and the photon selection criteria. The results are compared with next-to-leading order perturbative QCD calculations and found to be in good agreement over four orders of magnitude in cross-section.Comment: 7 pages plus author list (18 pages total), 2 figures, 4 tables, final version published in Physics Letters