517 research outputs found
Mathematical modeling of solidification process near the inner core boundary of the Earth
Radially symmetric analytic solutions of the heat and mass transfer equations governing convection in the Earth's fluid core are found in terms of deviations from the adiabatic reference state. We demonstrate that an increase of the convective velocity leads to a decrease of the light constituent mass fraction and specific entropy. Where fluid is rising/descending, convective motions decrease/increase the mass fraction and entropy at the inner core boundary (ICB). The influence of convective motions on the thermal fluxes at the core mantle boundary is studied. On the basis of exact solutions we demonstrate that the liquid is supercooled near the ICB. An important point is that an increase in the convective velocity directed to the ICB increases the constitutional supercooling. We show that the anelastic model (AM) can be used only at small supercoolings near the ICB. The most probable solidification scenario "constitutional supercooling and morphological instability" should be described by a mushy layer theory near the ICB and by the AM in the rest region of the fluid outer core. On the basis of dendritic theory and selection mechanisms of crystal growth the dendrite tip radius and interdendritic spacing in the mushy layer at the ICB are determined in the presence of convection. © 2013 Elsevier Inc
Conditioned Unitary Transformation on biphotons
A conditioned unitary transformation ( polarization rotation) is
performed at single-photon level. The transformation is realized by rotating
polarization for one of the photons of a polarization-entangled biphoton state
(signal photon) by means of a Pockel's cell triggered by the detection of the
other (idler) photon after polarization selection. As a result, polarization
degree for the signal beam changes from zero to the value given by the idler
detector quantum efficiency. This result is relevant to practical realization
of various quantum information schemes and can be used for developing a new
method of absolute quantum efficiency calibration
Design and evaluation of pharmacological properties of a new 1,3,4-thiadiazolylamide derivative of 2-propylpentanoic acid
The use of the pharmacophoric approach is a promising direction for modifying the chemical structure of 2-propylpentanoic (valproic) acid in order to obtain new drug
Sea Ice Dynamics Induced by External Stochastic Fluctuations
The influence of stochastic fluctuations in the atmosphere and in the ocean caused by different occasional phenomena (noises) on dynamic processes of sea ice growth with a mushy layer is studied. It is shown that atmospheric temperature variances substantially increase the sea ice thickness, whereas dispersion variations of turbulent flows in the ocean to a great extent decrease the ice content produced by false bottom evolution. © 2013 Springer Basel
Solidification dynamics under random external-temperature fluctuations
The nonlinear dynamic mechanisms of solid-phase formation with a phase transition region are studied under periodic and random fluctuations of the cooling-boundary temperature. It is theoretically shown that a mushy zone can form even at close liquid and cooling-boundary temperatures due to random temperature field fluctuations. The growth of a solid phase with the mushy zone is investigated as a function of the autocovariance characteristics of random noises. © 2013 Pleiades Publishing, Ltd
Psychological features and social adaptation of internet-addicted adolescents and adolescents with cannabinoid addiction
The Objective of the research is to study the characteristics of character properties, emotional intelligence, social psychological adaptation of Internet addicted adolescents and adolescents addicted with drugs.
Design. A comparative study of the psychological properties of cannabinoid addicted adolescents (n = 20) and Internet addicted adolescents (n = 20), and also healthy adolescents without symptoms of addiction (n = 20) is conducted. The following methods are used in the study: Barratt’s impulsiveness scale (BIS-11), 1987, adapted by T.I. Medvedeva and S.N. Enikolopov, 2015, Cloninger temperament and character questionnaire (TCI-125), 1991, adapted by N.A. Almaev and L.D. Ostrovskaya, 2005, the methodology for diagnosing emotional intelligence MSCEITV 2.0 2002, adapted by E.A. Sergienko, N.I. Vetrova, 2009, the methodology for diagnosing the social psychological adapted by
K. Rogers and R. Diamond, 1954, adapted by A.K. Osnitsky, 2002, Chen Internet Addiction Scale (CIAS), 2003 adapted by V.L. Malygin and K.A. Feklisov, 2010
Results. Adolescents with Internet addiction and adolescents with cannabinoid addiction have a certain similarity in a number of characteristic features. They are characterized by a more pronounced motor impulsiveness, low self-control, low self-esteem, dependence on other individulas and circumstances, lack of clear life goals. In general, if compared to healthy adolescents they appear to be infantile individuals, socially maladjusted, more often experiencing emotional discomfort, which can result
in pathologies, i.e. particularly various types of addictive behaviour. Simultaneously, Internet-dependent adolescents are significantly different from those with cannabinoid addiction. They are characterized by a lower level of transcendence and a lesser inclination to spiritual practices and transpersonal experience accordingly. They have a low level of search for novelty, which characterizes them as conservative, rigid and passive individuals.
Conclusion. The data obtained reveal certain differences in the psychological mechanisms of Internet addiction and dependence on drugs. Psychological mechanisms of adolescent Internet addiction and dependence on cannabinoids have significant differences
PRACTICE-DRIVEN ARTICLE: TREATMENT SATISFACTION AND ITS FACTORS AMONG PATIENTS WITH AFFECTIVE AND DEPRESSIVE DISORDERS - METHODOLOGY OF STUDYING
Сross-analysis of big data in accreditation of health specialists
Objective: The relevance of this study is due to the mass accreditation of health professionals that is developing in Russia, which requires innovative measurement tools and opens new opportunities for a well-founded cross-analysis of specialists’ professional readiness quality. Purpose of the study: The purpose of this article is to present approved methodical approaches to the transformation of accreditation data into a format suitable for secondary analysis of medical schools graduates quality based on the requirements of Professional Standards. Method: The leading methods of secondary data analysis are: a) codification of indicators in the primary data accumulation array; b) statistical processing of study results (evaluation of the relationships between the arrays of primary data accumulation and instrumental data, the correlation of test scores obtained by accreditation results with the labor functions of Professional Standards); c) the creation of representative samples for data analysis. The implementation of methods is carried out in the mode of working with arrays of big data, which also uses the method of cross-analysis to identify additional factors that affect to specialists’ professional readiness quality. Results: As a results of the research, there were: 1) approaches to the codification of data in the array and their secondary analysis were developed; 2) three samples were constructed with an estimation of representativeness for different strata, including subjects, assignments and corresponding labor functions; 3) the matrix of primary data in the specialty “Pediatrics” was verified using the example of the results of students from 50 medical universities in Russia. Conclusion: Approbation of methods of secondary data analysis conducted on representative samples of the subjects showed the effectiveness of the developed approaches that should be used when analyzing large data sets in the procedures of certification or accreditation. The materials of the article can be useful for specialists in the field of assessing the quality of education or assessing the professional readiness of health professionals, managers, professors and pedagogical staff of medical schools, specialists of centers for independent assessment of qualifications. © 2018, Modestum Ltd.. All rights reserved
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