Nucleon Charge and Magnetization Densities from Sachs Form Factors

Relativistic prescriptions relating Sachs form factors to nucleon charge and magnetization densities are used to fit recent data for both the proton and the neutron. The analysis uses expansions in complete radial bases to minimize model dependence and to estimate the uncertainties in radial densities due to limitation of the range of momentum transfer. We find that the charge distribution for the proton is significantly broad than its magnetization density and that the magnetization density is slightly broader for the neutron than the proton. The neutron charge form factor is consistent with the Galster parametrization over the available range of Q^2, but relativistic inversion produces a softer radial density. Discrete ambiguities in the inversion method are analyzed in detail. The method of Mitra and Kumari ensures compatibility with pQCD and is most useful for extrapolating form factors to large Q^2.Comment: To appear in Phys. Rev. C. Two new figures and accompanying text have been added and several discussions have been clarified with no significant changes to the conclusions. Now contains 47 pages including 21 figures and 2 table

Economic security as a condition for sustainable development of countries, regions and enterprises

The basis of this research consists of conceptual developments of a methodological nature that allow one to diagnose and assess the limitations, threats and challenges of an economic, social, environmental, resource-technical, administrative and legal nature across the vertical of the economic levels of an integral national system. The purpose of the paper is to formulate an original methodological approach to the research of economic security, considering the causal connection between the elements of the totality of individual determinants and conditions characterizing threats and challenges. The peculiarity of the proposed approach lies in the fact that the authors consider the enterprise as the initial level of the economic system. The economic security of an enterprise largely determines the economic security of other levels of this system. They represent the business environment that can be a carrier of external threats that negatively affect the economic security of the enterprise. We believe that without ensuring economic security at all levels of the economic hierarchy, it is impossible to ensure the implementation of the concept of sustainable development. The use of the matrix principle justifiably allows the authors to solve the evaluation problem within a single methodological approach. It allows identifying the determinants that most affect economic security. It is assumed that the diagnostic results will allow developing specific measures to eliminate or reduce the role of negative factors and motivational and stimulating measures that ensure the resolution of contradictions arising from the presence of restrictions, including environmental and social, on entrepreneurial activity

Synthesis of benzoazocines from substituted tetrahydroisoquinolines and activated alkynes in a tetrahydropyridine ring expansion

Tetrahydroisoquinolines underwent tandem piperidine ring enlargement in the presence of activated alkynes in acetonitrile or methanol, producing tetrahydrobenzo[d]azocines in high yields. © Wiley-VCH Verlag GmbH & Co. KGaA, 2007

Synthesis of benzoazocines from substituted tetrahydroisoquinolines and activated alkynes in a tetrahydropyridine ring expansion

Tetrahydroisoquinolines underwent tandem piperidine ring enlargement in the presence of activated alkynes in acetonitrile or methanol, producing tetrahydrobenzo[d]azocines in high yields. © Wiley-VCH Verlag GmbH & Co. KGaA, 2007

New anion-radical salts (N-Me-2,5-di-MePz)(TCNQ)₂ and (N-Me-2,6-di-MePz)(TCNQ)₂ (Pz is pyrazine)

Anion-radical salts (ARS) of 7,7,8,8-tetracyanoquinodimethane (TCNQ) containing N-methyl-2,5-dimethyl-pyrazinium (N-Me-2,5-di-Me-Pz)⁺ and N-methyl-2,6 dimethyl-pyrazinium (N-Me-2,6-di-Me-Pz)⁺ cations have been first synthesized. Thier X-ray structure analysis has been performed, crystal and molecular structures have been determined, IR spectra have been investigated and electroconductive properties have been studied in a wide temperature range