On Tamm's problem in the Vavilov-Cherenkov radiation theory

We analyse the well-known Tamm problem treating the charge motion on a finite space interval with the velocity exceeding light velocity in medium. By comparing Tamm's formulae with the exact ones we prove that former do not properly describe Cherenkov radiation terms. We also investigate Tamm's formula cos(theta)=1/(beta n) defining the position of maximum of the field strengths Fourier components for the infinite uniform motion of a charge. Numerical analysis of the Fourier components of field strengths shows that they have a pronounced maximum at cos(theta)=1/(beta n) only for the charge motion on the infinitely small interval. As the latter grows, many maxima appear. For the charge motion on an infinite interval there is infinite number of maxima of the same amplitude. The quantum analysis of Tamm's formula leads to the same results.Comment: 28 pages, 8 figures, to be published in J.Phys.D:Appl.Phy

Nuclear Reaction Network for Primordial Nucleosynthesis: a detailed analysis of rates, uncertainties and light nuclei yields

We analyze in details the standard Primordial Nucleosynthesis scenario. In particular we discuss the key theoretical issues which are involved in a detailed prediction of light nuclide abundances, as the weak reaction rates, neutrino decoupling and nuclear rate modeling. We also perform a new analysis of available data on the main nuclear processes entering the nucleosynthesis reaction network, with particular stress on their uncertainties as well as on their role in determining the corresponding uncertainties on light nuclide theoretical estimates. The current status of theoretical versus experimental results for 2H, 3He, 4He and 7Li is then discussed using the determination of the baryon density as obtained from Cosmic Microwave Background anisotropies.Comment: LaTeX, 83 pages, 30 .pdf figures. Some typos in the units of R-functions in appendix D and relative plots fixe

Probable Influence of the Earth’s Electromagnetic Impedance on Pc3- Pc5 Pulsation Spectrum During an Earthquake Preparation Process

Connection between the variation of the geomagnetic field and seismic activities is an essential element ofthe fundamental problem of earthquake forecasting. It, in its turn, is divided into separate blocks such as specific geomagnetic pulsations generated in a certain area. Consequently, in order to consider them as an earthquake indicator it is necessary to clearly distinguish their properties from the ones of global geomagnetic pulsations

Psychological dysfunctions in women with bronchial asthma:Психологические дисфункции у женщин с бронхиальной астмой

Background. The importance of psychosocial factors in the management of bronchial asthma (BA) is discussed in clinical guidelines, including in international and national clinical guidelines. However, a specific evaluation of their role as a cause of poor asthma control in susceptible patients is required. Aim. Assessment of psychological health of women with different levels of asthma control.Materials and methods. The study included 108 women with asthma observed in Saratov center for Allergology who were stratified into 3 groups according to the control level (good, partial, uncontrolled, according to GINA). In establishing a diagnosis of asthma, standard methods were used (medical history, symptoms, spirography). To assess the level of control, ACQ-5 (Asthma Control Questionnaire 5 items-self-administered) was used, to assess the quality of life, questionnaires AQLQ-S (Asthma Quality of Life Questionnaire S); SF-36 (36-ltem MOS Short-Form Health Survey), a standardized and validated Russian version of the women’s health questionnaire WHQ (Women’s Health Questionnaire) were used; for psychological diagnosis and evaluation of social and personal competencies that contribute to the preservation and improvement of human health (the intellectual, personal, emotional, physical, social, creative, spiritual aspects), integrated multimodal questionnaire was used. The comparison was conducted with a control group of men with bronchial asthma, comparable in age and level of control.Results. Women with poorly controlled asthma had worse performance of AQLQ-S (combined median score of 3,43 instead of 5,13 in the group of good control; p < 0,05); all scales of the SF-36, including the general condition (43,48 against 55,07), role of physical (25,93 against 57,76) and emotional problems (43,83 against 64,37); at p < 0.05. According to the WHQ questionnaire (the inverse relationship: the higher the score, the lower the quality of life) in the group with poor control there is a high level of depression (mean 0,36 versus 0,24; p < 0,05); physical health problems are marked (0,47 against 0,27; p < 0,05). There is a very low selfestimation of their attractiveness in BA (0,71 and 0,64 for bad and good control, respectively). According to the integrated multimodal questionnaire, in both men and women with asthma almost identical results were obtained on the scales sensitive to manifestations of anxiety-depressive symptoms, emotional balance, scales of emotional skills, correlating with severe alexithymia and low capacity for reflection. Among women the proportion of individuals with high scores of intellectual functioning, strong-willed competence, goal-setting, and ability of making contacts was higher.Conclusion. The severity of asthma and disease control are closely linked with the psychological condition of the patient. Psychological dysfunctions are correlated with suboptimal BA control. It is important to understand psychological differences in women and to educate patients in both effective BA control and in establishing individualized asthma management strategies.There is a need for a multidisciplinary approach aimed at the identification and effective correction of asthma. The study of the psychological characteristics of personality and motivational sphere of the patient can help to optimize therapy, improve monitoring and prognosis of the disease