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Search Results: 1 - 10 of 3406 matches for " Roman Zdorovennov "
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Long-term characteristics of ice phenology in Karelian lakes
Tatiana Efremova,Nikolay Palshin,Roman Zdorovennov
Estonian Journal of Earth Sciences , 2013, DOI: 10.3176/earth.2013.04
Abstract: The statistical relationships between lake ice phenology (freeze and break-up dates, ice duration), air temperature and North Atlantic Oscillation (NAO) index are analysed for eight lakes in Karelia from 1950 to 2009. Linear trends over this time period are estimated. It is shown that in the last 20 years trends in the timing of ice phenomena are more evident than in the entire 60-year period. The statistical relationship between lake ice phenology and variability of regional air temperature is used in the empirical model to assess ice-related events on previously unstudied lakes in NW Russia.
Interannual variability of ice and snow cover of a small shallow lake
Roman Zdorovennov,Nikolay Palshin,Galina Zdorovennova,Tatiana Efremova
Estonian Journal of Earth Sciences , 2013, DOI: 10.3176/earth.2013.03
Abstract: The interannual variability of ice and snow of small shallow Lake Vendyurskoe (Karelia, Russia) is investigated on the basis of long-term records (1994–2011). The water temperature, thickness of the snow and ice, as well as incident, reflected and penetrating through the ice fluxes of solar radiation were registered. The lake surface albedo in spring varied widely from 0.95 (fresh snow, sunny weather) to 0.1 (water on the ice surface). The heat balance of the lake surface (solar and effective long-wave radiation, evaporation and condensation, turbulent heat transfer) was estimated for the period of melting. The amount of heat accumulated in the sub-ice layer during the spring convection was assessed. Estimates of the proportion of solar radiation on the melting of ice and water heating in the under-ice layer during the spring thaw were carried out.
Mathematical Model of Embodied Symbols: Cognition and Perceptual Symbol System  [PDF]
Leonid Perlovsky, Roman Ilin
Journal of Behavioral and Brain Science (JBBS) , 2012, DOI: 10.4236/jbbs.2012.22024
Abstract: A mathematical model of perceptual symbol system is developed. This development requires new mathematical methods of dynamic logic (DL), which have overcome limitations of classical artificial intelligence and connectionist approaches. The paper discusses these past limitations, relates them to combinatorial complexity (exponential explosion) of algorithms in the past, and relates it further to the static nature of classical logic. DL is a process-logic; its salient property is evolution of vague representations into crisp. We first consider one aspect of PSS: situation learning from object perceptions. Next DL is related to PSS mechanisms of concepts, simulators, grounding, embodiment, productiveity, binding, recursion, and to the mechanisms relating embodied-grounded and amodal symbols. We discuss DL capability for modeling cognition on multiple levels of abstraction. PSS is extended toward interaction between cognition and language. Experimental predictions of the theory are discussed. They might influence experimental psychology and impact future theoretical developments in cognitive science, including knowledge representation, and mechanisms of interaction between perception, cognition, and language. All mathematical equations are also discussed conceptually, so mathematical understanding is not required. Experimental evidence for DL and PSS in brain imaging is discussed as well as future research directions.
Fractal Parametric Oscillator as a Model of a Nonlinear Oscillation System in Natural Mediums  [PDF]
Roman I. Parovik
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2013, DOI: 10.4236/ijcns.2013.63016
Abstract:

The paper presents a model of fractal parametric oscillator. Showing that the solution of such a model exists and is unique. A study of the solution with the aid of diagrams Stratton-Ince. The regions of instability, which can occur parametric resonance. It is suggested that this solution can be any signal, including acoustic.

Working Time Reductions and Labour Force Participation in Unemployment Contexts: A Note  [PDF]
Angel Martin-Roman
Theoretical Economics Letters (TEL) , 2014, DOI: 10.4236/tel.2014.43025
Abstract: Work-sharing measures aim to reduce unemployment. When politicians are more interested in fostering this kind of measures is when the official unemployment rate published in statistics rises. There is already an important body of research addressing this issue, but it has mainly focused on the labour demand side. Nevertheless, it must not be forgotten that unemployment is determined both by demand and supply. The neoclassical model of labour supply predicts that a reduction of standard working hours encourages labour market participation. In this paper we show that this unambiguous result vanishes precisely when high unemployment makes that search transaction costs cannot be considered negligible.
Analytical Modeling of Vibration of Micropolar Plates  [PDF]
Lev Steinberg, Roman Kvasov
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.65077
Abstract: This paper presents an extension of mathematical static model to dynamic problems of micropolar elastic plates, recently developed by the authors. The dynamic model is based on the generalization of Hellinger-Prange-Reissner (HPR) variational principle for the linearized micropolar (Cosserat) elastodynamics. The vibration model incorporates high accuracy assumptions of the micropolar plate deformation. The computations predict additional natural frequencies, related with the material microstructure. These results are consistent with the size-effect principle known from the micropolar plate deformation. The classic Mindlin-Reissner plate resonance frequencies appear as a limiting case for homogeneous materials with no microstructure.
Reporte de caso y serie de casos: una aproximación para el pregrado
Franco Romaní Romaní
CIMEL. Ciencia e Investigación Médica Estudiantil Latinoamericana , 2010,
Abstract: La frecuencia de publicación de reportes y series de casos se ha incrementado con el transcurrir del tiempo. El reporte de un caso es la publicación biomédica que hace un reporte detallado de síntomas, signos, resultados de estudios auxiliares, tratamiento, complicaciones del tratamiento y seguimiento de un paciente individual, mientras que una serie de casos reporta entre 2 a 10 casos con alguna característica semejante que los vuelve agrupables. Los reportes de caso no permiten establecer causalidad y han ido perdiendo lugar en un cada vez mayor número de revistas por: su bajo rigor científico o por su bajo nivel de aplicación general en la práctica médica. Entre los criterios para que un caso sea evaluable se necesita que el caso sea una condición o enfermedad nueva, condición rara, infrecuente o poco comunicada, presentación inusual de enfermedad común o poco frecuente, entre otros. Cada reporte de caso presenta una condición única que tiene un valor educativo para el lector y que sirve para el planteamiento de hipótesis o la aparición de nuevas inquietudes que posteriormente puedan sean estudiadas mediante métodos más complejos.
Risk and Uncertainty in Anesthesia  [PDF]
Roman Pohorecki,Gary E. Hill
Open Journal of Anesthesiology (OJAnes) , 2013, DOI: 10.4236/ojanes.2013.37072
Abstract: This article discusses risk and uncertainty, both stochastic and epistemic, as it applies to anesthesia. It shows the difficulty in quantifying risk of individual case and the somewhat arbitrary and even incorrect and naive assignment of risk in individual patient care management. Effective and honest communication remains at the core of physician-patient relationship in discussing, evaluating and managing the individual case for optimum outcome as well as patients’ and their families' satisfaction and understanding.
Risk and Uncertainty in Anesthesia  [PDF]
Roman Pohorecki, Gary E. Hill
Open Journal of Anesthesiology (OJAnes) , 2013, DOI: 10.4236/ojanes.2013.37072
Abstract:

This article discusses risk and uncertainty, both stochastic and epistemic, as it applies to anesthesia. It shows the difficulty in quantifying risk of individual case and the somewhat arbitrary and even incorrect and naive assignment of risk in individual patient care management. Effective and honest communication remains at the core of physician-patient relationship in discussing, evaluating and managing the individual case for optimum outcome as well as patients’ and their families' satisfaction and understanding.

Serum lipid growth curves for children and adolescents in predicting adult dyslipidemia (Data from the Slovak Lipid Community Study)  [PDF]
Roman Alberty,Dá?a Albertyová
Advances in Biological Chemistry (ABC) , 2013, DOI: 10.4236/abc.2013.35045
Abstract: Objectives: To create age-and sex-specific growth curves for serum lipids in Slovak children and adolescents, and to compare age-and sex-specific cut-off points with the currently recommended procedure using a single set of risk values for the whole child and adolescent population. Methods: Data were extracted from a cross-sectional Slovak Lipid Community Study conducted in 2005-2007; 873 healthy children and adolescents aged 7-18 years were selected for this study. Smoothed percentile curves were generated by LMS Pro software. Results: All lipid parameters (except for total cholesterol and LDL-cholesterol in girls) were higher in puberty than in adolescence, with the lowest serum lipids between the ages of 15 and 16 years. Mean triglyceride levels were higher in girls than in boys in all age groups. At the age of 18 years, about 19% boys and 25% girls had borderline and 6% boys and 15% girls had elevated total cholesterol. Elevated triglyceride levels were seen in 13% of boys and 11% of girls while abnormally low levels of HDL-cholesterol were found in 17% of boys and 10% of girls. Conclusions: The results of this study suggest that 1) age and gender play a strong role in lipid measurements in children and adolescents, 2) Slovak children and adolescents have a relative high proportion of abnormal lipid levels, and 3) age-and sex-specific cut-off points for serum lipids could be used to identify children and adolescents with an elevated risk of dyslipidemia in adulthood.
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