Chiral color symmetry and possible G′G'-boson effects at the Tevatron and LHC

A gauge model with chiral color symmetry is considered and possible effects of the color $G'$-boson octet predicted by this symmetry are investigated in dependence on two free parameters, the mixing angle $\theta_G$ and $G'$ mass $m_{G'}$. The allowed region in the $m_{G'} - \theta_G$ plane is found from the Tevatron data on the cross section $\sigma_{t\bar{t}}$ and forward-backward asymmetry $A_{\rm FB}^{p \bar p}$ of the $t\bar{t}$ production. The mass limits for the $G'$-boson are shown to be stronger than those for the axigluon. A possible effect of the $G'$-boson on the $t\bar{t}$ production at the LHC is discussed and the mass limits providing for the $G'$-boson evidence at the LHC are estimated in dependence on $\theta_G$.Comment: 11 pages, 2 figures, accepted for publication in Modern Physics Letters

Associative production of B_c and D mesons at LHC

It is shown that the study of correlations in the associative production of B_c and D mesons at LHC allows to obtain the essential information about the B_c production mechanism.Comment: 14 pages, 10 figures. Some misprints have been removed in the last version. The reference to CTEQ pdf has been adde

Influence of the inert and active ion bombardment on structure of the transition metal thin films

The results of the experimental research of the inert (He, Ne, Ar, Kr, Xe) and active (O, N) ion impact on the transition metal structure are presentedyesBelgorod State Universit

Simulation of total brain ischemia in rats

This paper deals with the study of the dependence of psycho neurological deficit in rats on the severity of brain damage, conducted on the four-vascular models of total cerebral ischemia. The obtained results demonstrate a tendency to deterioration of neuropsychiatric status of the animals with increasing severity of ischemic brain damage that allows suggesting the severity of ischemic brain damage and its correction by the degree of behavioral disorder

Forward observables at RHIC, the Tevatron run II and the LHC

We present predictions on the total cross sections and on the ratio of the real part to the imaginary part of the elastic amplitude (rho parameter) for present and future pp and pbar p colliders, and on total cross sections for gamma p -> hadrons at cosmic-ray energies and for gamma gamma -> hadrons up to sqrt(s)=1 TeV. These predictions are based on a study of many possible analytic parametrisations and invoke the current hadronic dataset at t=0. The uncertainties on total cross sections, including the systematic theoretical errors, reach 1% at RHIC, 3% at the Tevatron, and 10% at the LHC, whereas those on the rho parameter are respectively 10%, 17%, and 26%.Comment: 11 pages, 2 figures, LaTeX, presented at the Second International "Cetraro" Workshop & NATO Advanced Research Workshop "Diffraction 2002", Alushta, Crimea, Ukraine, August 31 - September 6, 200

Non-existence of normal tokamak equilibria with negative central current

Recent tokamak experiments employing off-axis, non-inductive current drive have found that a large central current hole can be produced. The current density is measured to be approximately zero in this region, though in principle there was sufficient current drive power for the central current density to have gone significantly negative. Recent papers have used a large aspect-ratio expansion to show that normal MHD equilibria (with axisymmetric nested flux surfaces, non-singular fields, and monotonic peaked pressure profiles) can not exist with negative central current. We extend that proof here to arbitrary aspect ratio, using a variant of the virial theorem to derive a relatively simple integral constraint on the equilibrium. However, this constraint does not, by itself, exclude equilibria with non-nested flux surfaces, or equilibria with singular fields and/or hollow pressure profiles that may be spontaneously generated.Comment: 5 pages, 3 figures. Submitted to Physics of Plasmas, Feb. 14, 2003. Revised Feb. 24, 2003. Vers. 2: revised May 29 to clarify points raised by referee, add references to recent work. July 18, accepted for publicatio

Responsibility as a Key Competence of the 21st Century Engineer

The growing anthropogenic impact on the environment, the consequences of which are often written and spoken of as frightening, even apocalyptic, has actualized the discourse on responsibility – of humanity as a whole, states, their governments, parliaments and other institutions, individual corporations, each person. The environmental agenda, responsible nature management, ecosystem thinking are at the center of their conflicting interests.It seems that engineering education should also focus on this issue. However, when analyzing the Federal State Educational Standards, it is found that the development of social and professional responsibility of students is not recorded as a necessary result of their training. Recently, professional standards have become a benchmark for higher education in terms of regulating the professional competencies of university graduates. The professional standards should define the level of employee’s responsibility, which serves as a defining characteristic of the qualification.Thus, there is a discrepancy between FSES and professional standards iregarding one of the key engineering competencies. This article focuses on this topic

Engineering Pedagogy in the Context of Engineering Activity

Engineering pedagogy is a professional activity that forms and develops the required future engineers’ competences with the help of appropriate pedagogical tools and technologies. It is essential that engineering graduates were productive, ready to actively participate in the innovative development of the chosen sphere. Ongoing development of engineering activity, its modernization, improvement, expansion into other areas of activity requires adjustment, updating goals, means and methodology of educational activity in general and engineering pedagogy in particular. Today engineering pedagogy should focus on the issues of a new ontology of engineering activity. The article aims to clarify ontological and methodological foundations of engineering activity, consider it as a multidimensional and multivariate system of division of labour, an open dynamic interdependent system. The article dwell on the conception of engineering designing, which has a property of recursiveness so that engineering activity may design itself. The authors argue that namely activity ontology should become the basis of the new methodology of engineering pedagogy, which creates the tools for training new generations of engineers by means of continuous professional education of university teaching staff