The connected components of the space of Alexandrov surfaces

Denote by $\mathcal{A}(\kappa)$ the set of all compact Alexandrov surfaces with curvature bounded below by $\kappa$ without boundary, endowed with the topology induced by the Gromov-Hausdorff metric. We determine the connected components of $\mathcal{A}(\kappa)$ and of its closure

Performance of the modified Becke-Johnson potential

Very recently, in the 2011 version of the Wien2K code, the long standing shortcome of the codes based on Density Functional Theory, namely, its impossibility to account for the experimental band gap value of semiconductors, was overcome. The novelty is the introduction of a new exchange and correlation potential, the modified Becke-Johnson potential (mBJLDA). In this paper, we report our detailed analysis of this recent work. We calculated using this code, the band structure of forty one semiconductors and found an important improvement in the overall agreement with experiment as Tran and Blaha [{\em Phys. Rev. Lett.} 102, 226401 (2009)] did before for a more reduced set of semiconductors. We find, nevertheless, within this enhanced set, that the deviation from the experimental gap value can reach even much more than 20%, in some cases. Furthermore, since there is no exchange and correlation energy term from which the mBJLDA potential can be deduced, a direct optimization procedure to get the lattice parameter in a consistent way is not possible as in the usual theory. These authors suggest that a LDA or a GGA optimization procedure is used previous to a band structure calculation and the resulting lattice parameter introduced into the 2011 code. This choice is important since small percentage differences in the lattice parameter can give rise to quite higher percentage deviations from experiment in the predicted band gap value.Comment: 10 pages, 2 figures, 5 Table

Equation of state of cubic boron nitride at high pressures and temperatures

We report accurate measurements of the equation of state (EOS) of cubic boron nitride by x-ray diffraction up to 160 GPa at 295 K and 80 GPa in the range 500-900 K. Experiments were performed on single-crystals embedded in a quasi-hydrostatic pressure medium (helium or neon). Comparison between the present EOS data at 295 K and literature allows us to critically review the recent calibrations of the ruby standard. The full P-V-T data set can be represented by a Mie-Gr\"{u}neisen model, which enables us to extract all relevant thermodynamic parameters: bulk modulus and its first pressure-derivative, thermal expansion coefficient, thermal Gr\"{u}neisen parameter and its volume dependence. This equation of state is used to determine the isothermal Gr\"{u}neisen mode parameter of the Raman TO band. A new formulation of the pressure scale based on this Raman mode, using physically-constrained parameters, is deduced.Comment: 8 pages, 7 figure

Dynamical coupled channel calculation of pion and omega meson production

A dynamical coupled channel approach is used to study $\pi$ and $\omega$--meson production induced by pions and photons scattering from the proton. Six intermediate channels including $\pi N$, $\eta N$, $\pi\Delta$, $\sigma N$, $\rho N$ and $\omega N$ are employed to describe unpolarized and polarized data. Bare parameters in an effective hadronic Lagrangian are determined in a fit to data for $\pi N \to \pi N$, $\gamma N \to \pi N$, $\pi^- p \to \omega n$, and $\gamma p \to \omega p$ reactions at center-of-mass energies from threshold to $W < 2.0$ GeV. The $T$ matrix determined in these fits is used to calculate the photon beam asymmetry for $\omega$-meson production and the $\omega N \to\omega N$ total cross section and $\omega N$ scattering lengths.Comment: 26 pages, 18 figures, submitted to Phys. Rev. C; corrected typos, added references, minor revisions, same results/fig

MANAGEMENT OF INNOVATIVE PROJECTS IN THE ENGINEERING COMPANIES

The article considers the problems of project management in engineering companies, including the stage of planning, organization and control over all matters in the continuous process of development of the project and the fulfillment of its purposes. It is shown that the use of methods of project management enables you to more effectively implement long-running implementation of decisions involving a significant number of units with different subordination

ANALYSIS OF ECONOMIC INDICATORS OF INNOVATIVE DEVELOPMENT OF ELECTRIC POWER COMPANIES

The article analyzes the criteria for evaluating the innovative development of multi-functional electric power companies. It proposed to supplement the innovative development indicators, which will allow management companies to more objectively evaluate the status and prospects of innovative development in the economic systems of different hierarchical levels of energy companies, taking into account the cumulative effect of the most important factors influencing the effectiveness of innovation

ANALYSIS OF ECONOMIC INDICATORS OF INNOVATIVE DEVELOPMENT OF ELECTRIC POWER COMPANIES

The article analyzes the criteria for evaluating the innovative development of multi-functional electric power companies. It proposed to supplement the innovative development indicators, which will allow management companies to more objectively evaluate the status and prospects of innovative development in the economic systems of different hierarchical levels of energy companies, taking into account the cumulative effect of the most important factors influencing the effectiveness of innovation

THE ORGANIZATION OF THE STATE SYSTEM OF MAKING PREDICTIONS IN THE ELECTRICITY INDUSTRY UNITED STATES

In the conditions of reforming of power industry and development of the market relations an important role is played by the government institutions which are carrying out regulation of activity of the energy companies. In article experiment of the USA on the organization of effective system of providing authorities with information necessary for formation of qualitative forecasts of development of branch is considered

MARKET ANALYSIS OF ENGINEERING SERVICES IN POWER INDUSTRY

In the context of the implementation of the strategy of modernization of the electric power industry plays an important role in the development of the engineering business that is in a stage of formation and development. It is shown that in recent years in the market of engineering services in power industry, there are many new players that significantly exacerbated competition in this business. Analyzed the main spheres of engineering activity for the company JSC «VTI»

FORMATION A STRATEGY OF AN ENGINEERING COMPANY IN A COMPETITIVE ENVIRONMENT

The article examines the approaches to the formation of the strategy of innovative development of the engineering companies in the competitive market of engineering services. There is a need to improve the work of companies for the commercialization of innovation that will substantially improve the efficiency and competitiveness of the engineering company. One of the most important stages of this process is the design and pre-sale preparation of the results obtained for its market implementation. The basic directions for the strategy of innovative development of the engineering company OJSC «VTI» are given