Voronezh State University

About: Voronezh State University is a education organization based out in Voronezh, Russia. It is known for research contribution in the topics: Silicon & Boundary value problem. The organization has 5166 authors who have published 6097 publications receiving 31680 citations. The organization is also known as: VSU & Voronezh University.

Researcher and Author Profiles: Opportunities, Advantages, and Limitations.

Abstract: Currently available online profiling platforms offer various services for researchers and authors. Opening an individual account and filling it with scholarly contents increase visibility of research output and boost its impact. This article overviews some of the widely used and emerging profiling platforms, highlighting their tools for sharing scholarly items, crediting individuals, and facilitating networking. Global bibliographic databases and search platforms, such as Scopus, Web of Science, PubMed, and Google Scholar, are widely used for profiling authors with indexed publications. Scholarly networking websites, such as ResearchGate and Academia.edu, provide indispensable services for researchers poorly visible elsewhere on the Internet. Several specialized platforms are designed to offer profiling along with their main functionalities, such as reference management and archiving. The Open Researcher and Contributor Identification (ORCID) project has offered a solution to the author name disambiguation. It has been integrated with numerous bibliographic databases, platforms, and manuscript submission systems to help research managers and journal editors select and credit the best reviewers, and other scholarly contributors. Individuals with verifiable reviewer and editorial accomplishments are also covered by Publons, which is an increasingly recognized service for publicizing and awarding reviewer comments. Currently available profiling formats have numerous advantages and some limitations. The advantages are related to their openness and chances of boosting the researcher impact. Some of the profiling websites are complementary to each other. The underutilization of various profiling websites and their inappropriate uses for promotion of 'predatory' journals are among reported limitations. A combined approach to the profiling systems is advocated in this article.

Method of the reduced-added Green function in the calculation of atomic polarizabilities

Abstract: The Green function in the quantum defect theory provides an exact account for high-excited and continuum electronic states. We modify it by taking into account the ground and low-excited states using their wave functions calculated ab initio. As an application, we present a simple and efficient semianalytical method for the calculation of atomic electric frequency-dependent scalar dipole polarizability, for both real and imaginary frequencies. The polarizabilities calculated for some atoms (Li, Na, K, Be, Mg, Ca, Si, P, S, O, Al, Ge, C, N, F, He, Ne, Ar, Kr, and Xe) are compared with existing methods of computational quantum chemistry and with experiments; good accuracy of the proposed method is demonstrated.

Frequency Shifts in an Optical Lattice Clock Due to Magnetic-Dipole and Electric-Quadrupole Transitions

Abstract: We report a hitherto undiscovered frequency shift for forbidden J = 0-->J = 0 clock transitions excited in atoms confined to an optical lattice These shifts result from magnetic-dipole and electric-quadrupole transitions, which have a spatial dependence in an optical lattice that differs from that of the stronger electric-dipole transitions In combination with the residual translational motion of atoms in an optical lattice, this spatial mismatch leads to a frequency shift via differential energy level spacing in the lattice wells for ground state and excited state atoms We estimate that this effect could lead to fractional frequency shifts as large as 10(-16), which might prevent lattice-based optical clocks from reaching their predicted performance levels Moreover, these effects could shift the magic wavelength in lattice clocks in three dimensions by as much as 100 MHz, depending on the lattice configuration