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Search Results: 1 - 10 of 8561 matches for " Roman Shakarishvili1 "
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Selected acute phase CSF factors in ischemic stroke: findings and prognostic value
Maia Beridze, Tamar Sanikidze, Roman Shakarishvili1, Nino Intskirveli, Natan M Bornstein
BMC Neurology , 2011, DOI: 10.1186/1471-2377-11-41
Abstract: Ninety five acute ischemic stroke patients were investigated. Ischemic region visualized at the twenty fourth hour by conventional Magnetic Resonance Imaging. Stroke severity evaluated by National Institute Health Stroke Scale. One month outcome of disease was assessed by Barthel Index. Cerebrospinal fluid was taken at the sixth hour of stroke onset. CSF pro- and anti-inflammatory cytokines were studied by Enzyme Linked Immunosorbent Assay. Nitric Oxide and Lipoperoxide radical were measured by Electron Paramagnetic Resonance. CSF Nitrate levels were detected using the Griess reagent. Statistics performed by SPSS-11.0.At the sixth hour of stroke onset, cerebrospinal fluid cytokine levels were elevated in patients against controls. Severe stroke patients had increased interleukin-6 content compared to less severe strokes (P < 0.05). Cerebrospinal fluid Electron Paramagnetic Resonance signal of nitric oxide was increased in patients against controls. Severe stroke group had an elevated Electron Paramagnetic Resonance signal of lipoperoxiradical compared to less severe stroke. Cerebrospinal fluid nitrate levels in less severe stroke patients were higher than those for severe stroke and control. Positive correlation was established between the initial interleukin-6 content and ischemic lesion size as well as with National Institute Health Stroke Scale score on the seventh day. Initial interleukin-6 and nitrate levels in cerebrospinal fluid found to be significant for functional outcome of stroke at one month.According to present study the cerebrospinal fluid contents of interleukin-6 and nitrates seem to be the most reliable prognostic factors in acute phase of ischemic stroke.Modern concepts of acute cerebral ischemia highlight the role of neurovascular units and emphasize the importance of integrative tissue responses that result from dynamic interactions of endothelial cells, vascular sooth muscles, matrix elements, astroglia, microglia and neurons. By means of infla
Studying Low-x Dynamics using the Hadronic Final State in DIS at HERA
Roman Poeschl,for the H1,ZEUS Collaborations
Physics , 2003, DOI: 10.1140/epjcd/s2004-03-1741-y
Abstract: This article describes different approaches to investigate the behavior of parton evolution in the proton by exploiting various aspects of the hadronic final state produced in Deep Inelastic Scattering Events at HERA.
Determination of Retinol, -Tocopherol, Lycopene, and -Carotene in Human Plasma Using HPLC with UV-Vis Detection: Application to a Clinical Study
Roman Kand’ár,Pavla Novotná,Petra Drábková
Journal of Chemistry , 2013, DOI: 10.1155/2013/460242
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Energy Science and Technology , 2012, DOI: 10.3968/2805
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Energy Science and Technology , 2012, DOI: 10.3968/2804
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

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.
The Explanation of the Michelson-Morley Experiment Results by Means Universal Frame of Reference  [PDF]
Karol Szostek, Roman Szostek
Journal of Modern Physics (JMP) , 2017, DOI: 10.4236/jmp.2017.811110
Abstract: It is commonly thought that the Michelson-Morley experiment from 1887 and Kennedy-Thorndike experiment from 1932 demonstrated that the universal frame of reference (ether) does not exist and that the velocity of light in vacuum is absolutely constant. The analysis of this experiment led to the creation of the Special Theory of Relativity (STR). The article explains why Michelson-Morley and Kennedy-Thorndike experiments could not detect the universal frame of reference. In this article, a different transformation of time and position than the Lorentz transformation is derived on the basis of the geometric analysis of the Michelson-Morley and Kennedy-Thorndike experiments. The transformation is derived based on the assumption that the universal frame of reference (UFR) exists. UFR is a frame of reference in which the velocity of light is constant in every direction. In inertial frames of reference moving in the UFR, the velocity of light may be different. The article has derived the formula for relative speed and patterns for the maximum and minimum speed of light that can be measured in the inertial system. Finally, the anisotropy of the microwave background radiation has been explained by using the presented theory. According to the body kinematics model presented in this article, anisotropy of cosmic microwave background is the Doppler effect for observer moving in the UFR.
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