A ray mode parabolic equation for shallow water acoustics propagation problems

Ray mode parabolic equations which are suitable for shallow water acoustics propagation problems are derived by the multiple-scale method.Comment: 7 pp., 0 fi

Role of Communication Channels in the Accreditation Procedure for Medical Personnel

The article analyzes the role of information channels in the preparation and conduct of primary accreditation of medical specialists. The author draws attention to the fact that most of the difficulties that arise when implementing this procedure are associated with an abundance of misleading and provocative information materials, as well as a high speed of their distribution in the media space. A wide coverage of objective information, based primarily on regulatory legal acts, will significantly improve the efficiency of both the accreditation procedure for specialists and the entire medical education in the Russian Federation

Assessment of a Contribution of “Hotlines” Work to Development of Communication Channels between Public Authorities and Institutes of Civil Society

The article analyzes the experience of interaction of public authorities of the constituent entities of the Russian Federation in the field of health protection with civil society institutions through the use of telecommunication systems. The author has studied in detail the main characteristics of the work of the “hot lines”, such as: number, date of creation, monthly average workload, as well as the subject matter of the calls. The use of the study, including the mathematical apparatus, made it possible to identify the strengths and weaknesses of this communication resource, as well as identify the possibilities for its further development to improve communication between government bodies and civil society institutions

Instantaneous Radio Spectra of Giant Pulses from the Crab Pulsar from Decimeter to Decameter Wavelengths

The results of simultaneous multifrequency observations of giant radio pulses from the Crab pulsar, PSR B0531+21, at 23, 111, and 600 MHz are presented and analyzed. Giant pulses were detected at a frequency as low as 23 MHz for the first time. Of the 45 giant pulses detected at 23 MHz, 12 were identified with counterparts observed simultaneously at 600 MHz. Of the 128 giant pulses detected at 111 MHz, 21 were identified with counterparts observed simultaneously at 600 MHz. The spectral indices for the power-law frequency dependence of the giant-pulse energies are from -3.1 to -1.6. The mean spectral index is -2.7 +/- 0.1 and is the same for both frequency combinations (600-111 MHz and 600-23 MHz). The large scatter in the spectral indices of the individual pulses and the large number of unidentified giant pulses suggest that the spectra of the individual giant pulses do not actually follow a simple power law. The observed shapes of the giant pulses at all three frequencies are determined by scattering on interstellar plasma irregularities. The scatter broadening of the pulses and its frequency dependence were determined as tau_sc=20*(f/100)^(-3.5 +/- 0.1) ms, where the frequency f is in MHz.Comment: 13 pages, 1 figure, 1 table (originally published in Russian in Astronomicheskii Zhurnal, 2006, vol. 83, No. 7, pp. 630-637), translated by Georgii Rudnitski