Exact null controllability of abstract differential equations by finite-dimensional control and strongly minimal families of exponentials

Abstract. The exact controllability to the origin for linear evolution control equation is considered. The problem is investigated by its transformation to infinite linear moment problem of generalized exponentials. The existence of solutions of obtained moment problem is investigated for the case when exponentials of a moment problem do not constitute a Riesz basis. The exact controllability of linear control system of neutral type is considered as an example

Bremsstrahlung in intermediate-energy nucleon reactions within an effective one-beson exchange model

Within a covariant effective one-boson exchange model for the T matrix of NN interactions we present detailed calculations of bremsstrahlung cross sections for proton - proton and proton - neutron reactions at beam energies in the 1 GeV region. Besides pure bremsstrahlung processes we consider photons from ∆ decays and contributions from the η → γγ process. At beam energies above 700 MeV the ∆ decay channel dominates the spectra at large photon energies, where the interference between non-resonance processes and the ∆ decay channel becomes also important. Low energy photons stem from pure bremsstrahlung processes. The available experimental data at 730 MeV beam energy is well described. We extrapolate the model down to 280 MeV, where more detailed experimental data exist, and find agreement with angular distributions

Análise de empresas de médias empresas da rússia na conexão dos distritos federais e principais municípios

The article examines the trends in the number of medium-sized enterprises in Russia, in the context of federal districts and major municipalities. Detailed information is provided on the number and dynamics of medium-sized enterprises in Russia by federal districts and the largest municipalities for the period from 2008 to 2017. The indicators of the number of employees, labor efficiency and revenues of medium-sized businesses are considered. Developed by the authors and presented in the article, the map of medium-sized businesses allows you to make both management decisions to state and municipal authorities, and make investment decisions.El artículo examina las tendencias en el número de empresas medianas en Rusia, en el contexto de los distritos federales y los principales municipios. Se proporciona información detallada sobre el número y la dinámica de las medianas empresas en Rusia por los distritos federales y los municipios más grandes durante el período de 2008 a 2017. Los indicadores de la cantidad de empleados, la eficiencia laboral y los ingresos de las medianas empresas son considerados. Desarrollado por los autores y presentado en el artículo, el mapa de las medianas empresas le permite tomar decisiones de gestión ante las autoridades estatales y municipales, y tomar decisiones de inversión.O artigo examina as tendências no número de empresas de médio porte na Rússia, no contexto de distritos federais e grandes municípios. Informações detalhadas sobre o número e a dinâmica das empresas de médio porte na Rússia são fornecidas pelos distritos federais e os maiores municípios durante o período de 2008 a 2017. Os indicadores do número de funcionários, a eficiência da mão-de-obra e a renda das medianas Empresas são consideradas. Desenvolvido pelos autores e apresentado no artigo, o mapa de empresas de médio porte permite que eles tomem decisões de gestão perante as autoridades estaduais e municipais e tomem decisões de investimento

Bremsstrahlung in intermediate-energy nucleon reactions within an effective one-boson exchange model

Within a covariant effective one-boson exchange model for the $T$ matrix of $NN$ interactions we present detailed calculations of bremsstrahlung cross sections for proton - proton and proton - neutron reactions at beam energies in the 1 GeV region. Besides pure bremsstrahlung processes we consider photons from $\Delta$ decays and contributions from the $\eta \to \gamma \gamma$ process. At beam energies above 700 MeV the $\Delta$ decay channel dominates the spectra at large photon energies, where the interference between non-resonance processes and the $\Delta$ decay channel becomes also important. Low energy photons stem from pure bremsstrahlung processes. The available experimental data at 730 MeV beam energy is well described. We extrapolate the model down to 280 MeV, where more detailed experimental data exist, and find agreement with angular distributions.Comment: 20 pages with 10 figures, to be published in Nucl. Phys.