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Search Results: 1 - 10 of 8493 matches for " Vladimir Merkin "
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Decompressive Craniectomy for Posterior Reversible Encephalopathy Syndrome (PRES): Case Report  [PDF]
Amit Azriel, Israel Melamed, Ilan Shelef, Yuval Sufaro, Micky Gidon, Vladimir Merkin, Alexandr Shtreizent, Avi Cohen
Case Reports in Clinical Medicine (CRCM) , 2015, DOI: 10.4236/crcm.2015.45034
Abstract:
Background: Posterior reversible encephalopathy syndrome (PRES) is an uncommon clinical-neuroradiological syndrome with an unclear pathophysiology. Correlation between PRES and the use of immunosuppressant drugs have previously been described, as well as correlation between elevated blood pressure and PRES. Characteristic brain MRI manifestations include hyperintense lesions on T2 and FLAIR (fluid-attenuated inversion recovery) images. PRES is usually reversible within a short period of time after discontinuation of the presumably offending drug. Some cases of PRES might complicate with intracranial hemorrhage, refractory status epilepticus or expansive vasogenic brain edema (also regarded as “tumefactive” PRES). Methods: We present a case of a young man diagnosed with Hodgkin’s lymphoma, following a laparotomy due to cecal volvulus. The patient received glucocorticoids and elevated blood pressure values were recorded. Brain imaging studies were performed due to generalized epileptic seizures, demonstrating neuroradiological findings consistent with PRES. Neurological and neuroradiological deterioration was noted, necessitating urgent neurosurgical intervention. A complete neurological and functional rehabilitation was achieved. Conclusion: The uncommon cases of complicated PRES should be taken under consideration whenever clinical deterioration is noted following the diagnosis of PRES. Early neuroradiological evaluation should be sought, together with aggressive medical and surgical treatment in cases of life threatening mass effect.
A note on the free convection boundary layer on a vertical surface with prescribed heat flux at small Prandtl number
J. H. Merkin,V. Kumaran
International Journal of Mathematics and Mathematical Sciences , 1992, DOI: 10.1155/s0161171292000772
Abstract: It is shown that for a particular case of the surface heat flux the equations for small Prandtl number have simple analytical solutions. These are presented and compared with numerical solutions of the general equations.
The role of the bow shock in solar wind-magnetosphere coupling
R. E. Lopez, V. G. Merkin,J. G. Lyon
Annales Geophysicae (ANGEO) , 2011,
Abstract: In this paper we examine the role of the bow shock in coupling solar wind energy to the magnetosphere using global magnetohydrodynamic simulations of the solar wind-magnetosphere interaction with southward IMF. During typical solar wind conditions, there are two significant dynamo currents in the magnetospheric system, one in the high-latitude mantle region tailward of the cusp and the other in the bow shock. As the magnitude of the (southward) IMF increases and the solar wind becomes a low Mach number flow, there is a significant change in solar wind-magnetosphere coupling. The high-latitude magnetopause dynamo becomes insignificant compared to the bow shock and a large load appears right outside the magnetopause. This leaves the bow shock current as the only substantial dynamo current in the system, and the only place where a significant amount of mechanical energy is extracted from the solar wind. That energy appears primarily as electromagnetic energy, and the Poynting flux generated at the bow shock feeds energy back into the plasma, reaccelerating it to solar wind speeds. Some small fraction of that Poynting flux is directed into the magnetosphere, supplying the energy needed for magnetospheric dynamics. Thus during periods when the solar wind flow has a low Mach number, the main dynamo in the solar wind-magnetosphere system is the bow shock.
Unsteady free convection of a stagnation point of attachment on an isothermal surface
D. B. Ingham,J. H. Merkin,I. Pop
International Journal of Mathematics and Mathematical Sciences , 1984, DOI: 10.1155/s0161171284000648
Abstract: The time development free convection flow near a three-dimensional stagnation point of attachment on an isothermal surface is studied at large Grashof numbers. A small time solution and an accurate numerical method is described for determining the solution of the time-dependent boundary-layer equations. For a range of values of parameter c, which describes the local geometry, the development of the various physical properties of the flow are calculated and compared with their values at small and large values of time. In another range of values of c the numerical results suggest the development of a singularity in the boundary-layer equations at a finite value of time. An anlysis is presented which is consistent with the numerical results and confirms the presence of this singularity.
Weak Interaction and the Nature of Virtual Particles  [PDF]
Vladimir Konushko
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.22009
Abstract: The granular structure of space, the nature of virtual particles and the unity of physical interactions are under study. The mass of an elementary cell in the Universe is determined, as a whole, with the physical meaning of the renormalization procedure changing in this case.
Granular Space and the Problem of Large Numbers  [PDF]
Vladimir Konushko
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.25038
Abstract: Two and a half thousand years ago the ancient atomists made a suggestion that space has a cellular structure, is material and consists of elementary cells. In 1900 Plank found the elementary length L*=10-33 cm. This notion has been widely used in modern physics ever since. The properties of granular space are studied in this article on the assumption that a three-dimensional material cell with the size of Planck’s elementary length is the only material for the construction of the whole Universe. This approach allows one to account for such mysterious phenomena as inertia, ultimate velocity of transfer of material body interactions and huge difference between gravitational and Coulomb forces - the so called “Large Numbers Problem”, as well essence of electric charge and Pauli exclusions principle.
Gravitational Energy Level and the Nature of Microwave Background of Universe  [PDF]
Vladimir Konushko
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.24026
Abstract: In 1965, Penzias and Wilson discovered thermal radiation with T0 ~ 2.7 K further on called “relict”. This article is concerned with the new phenomenon, i.e. the formation of gravitational energy levels by any body, with the result that photons are produced whose spectrum close to the Earth is similar to that of a blackbody with T0 ~ 2.7 K. The critical analysis of the experiments performed with the cosmic observatories COBE and WMAP completely confirms this prediction.
Translational Motion of a Free Large Polaron and Broadening of Absorption Spectra  [PDF]
Vladimir Mukhomorov
Journal of Modern Physics (JMP) , 2010, DOI: 10.4236/jmp.2010.11002
Abstract: The translational motion of a large polaron as whole is analyzed in the context of its effect on the broadening of an absorption optical spectrum. It was open question how important the role of translational degrees of freedom and the corresponding velocities are on the broadening. The Bogolyubov method of canonical transformation of coordinates is formulated for a system of an electron and field, taking into account rigorous fulfillment of the conservation laws. Separation of variables is carried out for the coordinates describing the translational degrees of freedom and the electron oscillations in a polarization well. The equations obtained for the electronic states explicitly depend on the velocity of the free polaron as a whole. An estimate is made for free polaron in ammonia.
Possible schemes of calculation modeling in a quantum computer  [PDF]
Vladimir Voronov
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.28114
Abstract: In the present work a possibility of computation modeling, which should be realized in a real quantum computer, is discussed. In this connection two models of a device, which work is determined by the structure and dynamics of real molecular systems are reported.
Stability of Atoms, Causality in Elementary Processes and the mystery of Interference and Hyroscope  [PDF]
Vladimir Konushko
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.33032
Abstract: An investigation into real structure of space allows solving in a new way the problem of stability of atom: an electron on the ground level is a rest. The absolute causality of all the phenomena in the Universe is substantiated. Heisenberg inequalities make some sense only when it is impossible to conjugated physical values. The work is concern with the mystery of interference and hyroscope.
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