RUP И ГОСТ: ЕДИНСТВО ИЛИ БОРЬБА ПРОТИВОПОЛОЖНОСТЕЙ?

The author has done a comparative analysis of the requirements of Russian State Standards (GOST) and methodology of Rational Unified Process (RUP). The RUP recommendations are more and more used in JSC Russian Railways to create software. The theme is topical, been directly related to the quality of designed management systems.Представлен сравнительный анализ требований ГОСТ и методологий RUP, рекомендациями которой начинают пользоваться в ОАО «РЖД» при создании программных продуктов. Тема обсуждения актуальна, ибо связана с качеством проектируемых систем управления

Chiral symmetry breaking in d=3 NJL model in external gravitational and magnetic fields

The phase structure of $d=3$ Nambu-Jona-Lasinio model in curved spacetime with magnetic field is investigated in the leading order of the $1/N$-expansion and in linear curvature approximation (an external magnetic field is treated exactly). The possibility of the chiral symmetry breaking under the combined action of the external gravitational and magnetic fields is shown explicitly. At some circumstances the chiral symmetry may be restored due to the compensation of the magnetic field by the gravitational field.Comment: 7 pages, LaTe

Dynamical symmetry breaking in the Nambu-Jona-Lasino model with external gravitational and constant electric fields

An investigation of the Nambu-Jona-Lasino model with external constant electric and weak gravitational fields is carried out in three- and four- dimensional spacetimes. The effective potential of the composite bifermionic fields is calculated keeping terms linear in the curvature, while the electric field effect is treated exactly by means of the proper- time formalism. A rich dynamical symmetry breaking pattern, accompanied by phase transitions which are ruled, independently, by both the curvature and the electric field strength is found. Numerical simulations of the transitions are presented.Comment: 20 pages, LaTeX, 6 .ps-figures, Final version published in "Classical and Quantum Gravity

ТАКСОНОМИЯ КАК ИНСТРУМЕНТ СТРАТЕГИИ

The article underlines the importance of employment of taxonomy for project and program management. The actuality of reviewed problems refers to the lack of investments when a business is under crisis conditions and the limited resources in project portfolio are redistributed and sequestered.Статья характеризует значимость  применения таксономии  в управлении проектами  и программами. Актуальность  поднимаемых в ней проблем связана  с нехваткой инвестиций в кризисных  для бизнеса условиях, когда  в портфеле проектов предприятия  постоянно идет перераспределение  и секвестирование жестко  ограниченных ресурсов

Experimental investigation of high-energy photon splitting in atomic fields

The new data analysis of the experiment, where the photon splitting in the atomic fields has been observed for the first time, is presented. This experiment was performed at the tagged photon beam of the ROKK-1M facility at the VEPP-4M collider. In the energy region of 120-450 MeV, the statistics of $1.6\cdot 10^9$ photons incident on the BGO target was collected. About 400 candidates to the photon splitting events were reconstructed. Within the attained experimental accuracy, the experimental results are consistent with the cross section calculated exactly in an atomic field. The predictions obtained in the Born approximation significantly differ from the experimental results.Comment: 11 pages, 6 figures, LaTe

Magnetic Catalysis: A Review

We give an overview of the magnetic catalysis phenomenon. In the framework of quantum field theory, magnetic catalysis is broadly defined as an enhancement of dynamical symmetry breaking by an external magnetic field. We start from a brief discussion of spontaneous symmetry breaking and the role of a magnetic field in its a dynamics. This is followed by a detailed presentation of the essential features of the phenomenon. In particular, we emphasize that the dimensional reduction plays a profound role in the pairing dynamics in a magnetic field. Using the general nature of underlying physics and its robustness with respect to interaction types and model content, we argue that magnetic catalysis is a universal and model-independent phenomenon. In support of this claim, we show how magnetic catalysis is realized in various models with short-range and long-range interactions. We argue that the general nature of the phenomenon implies a wide range of potential applications: from certain types of solid state systems to models in cosmology, particle and nuclear physics. We finish the review with general remarks about magnetic catalysis and an outlook for future research.Comment: 37 pages, to appear in Lect. Notes Phys. "Strongly interacting matter in magnetic fields" (Springer), edited by D. Kharzeev, K. Landsteiner, A. Schmitt, H.-U. Yee. Version 2: references adde

FORMATION OF A PENTAGONAL PARTICLE STRUCTURE FROM COPPER NANOCLUSTERS

The structure o f pentagonal particles and the processes o f their formation from nanoclusters with the fifthorder symmetry axes are investigated by the methods o f computer modeling and scanning electron-ion microscopy using copper as an example. It is demonstrated that the mechanism o f cluster growth to pentagonal particles can be realized at which the volumetric stress present in noncrystal clusters will be released without breaking o f the fifth-order symmetry o f the growing cluster shape

Hadronic Regge Trajectories: Problems and Approaches

We scrutinized hadronic Regge trajectories in a framework of two different models --- string and potential. Our results are compared with broad spectrum of existing theoretical quark models and all experimental data from PDG98. It was recognized that Regge trajectories for mesons and baryons are not straight and parallel lines in general in the current resonance region both experimentally and theoretically, but very often have appreciable curvature, which is flavor-dependent. For a set of baryon Regge trajectories this fact is well described in the considered potential model. The standard string models predict linear trajectories at high angular momenta J with some form of nonlinearity at low J.Comment: 15 pages, 9 figures, LaTe