1,638 research outputs found
Optical Diagnostics For The Study Of Plasma Evolution In Linear Theta-pinch Tc-1
No full textThe plasma generated in the field reversed theta-pinch TC-1 discharge was investigated by means of a number of optical diagnostics: CO2 laser-based interferometry, visible-VUV spectroscopy and ruby laser Thomson scattering. The evolution of the local electron density was studied by CO2 laser intereferometry. Thomson scattering was employed for measurements of the electron density and temperature with high spatial resolution. The temporal behavior of line emission of oxygen and carbon in various ionization stages was studied by VUV spectroscopy. The time dependence of the electron temperature was evaluated from the analysis of the time history of line emission of impurity ions. The ion temperature was measured from the Doppler-broadened oxygen line emission profiles.264747754Aramaki, E.A., Porto, P., Berni, L., Honda, R.Y., Ueda, M., Doi, I., Machida, M., (1989) Nucl. Instr. Meth. Phys. Res., A, 280, p. 597Tuszewski, M., (1988) Nuclear Fusion, 28, p. 2033Campos, D.O., Machida, M., Berni, L.A., Kantor, M.Yu., Moshkalyov, S.A., Lebedev, S.V., (1995) Proc. de 30 Encontro Bras. de Física dos Plasmas, p. 90. , Águas de Lindóia, SP, BrasilBerni, L.A., Campos, D.O., Machida, M., Moshkalyov, S.A., Lebedev, S.V., Monteiro, M.J.R., Zibordi, R., (1995) Proc. de 30 Encontro Bras. de Física dos Plasmas, p. 79. , Águas de Lindóia, SP, BrasilMoshkalyov, S.A., Machida, M., Lebedev, S.V., Campos, D.O., (1995) Revista Bras. de Física Appl. Instr., 10, p. 107Greve, P., Kato, M., Kunze, H.-J., Hornady, R.S., (1981) Phys.Rev., A, 24, p. 429Kunze, H.-J., (1971) Phys.Rev., A, 3, p. 93
Low-angle Thomson Scattering Experiment For Determination Of Plasma Electron Density And Temperature
No full textIn this work we show results of measurements of the electron density ne and temperature Te by using small-angle Thomson scattering in a theta-pinch plasma. The method of measurement and analysis developed here is based on integration of only two ranges of the scattering profile. This method simplifies the experimental set up, because it needs only two detectors for simultaneous determination of ne and Te, instead of the commonly 5-7 detectors used in 90° experiments. The results obtained for low-angle scattering are compared with the measurements at 90° using single pass and multipass under the same plasma conditions.25601/02/15437441Berni, L.A., Campos, D.O., Machida, M., Moshkalyov, S.A., Lebedev, S.V., Molecular Rayleigh scattering as calibration method for Thomson scattering experiments (1996) Brazilian Journal of Physics, 26 (4), p. 755Campos, D.O., Machida, M., Berni, L.A., Moshkalyov, S.A., Lebedev, S.V., The feasibility study of a low-angle Thomson scattering for determination of plasma electron density and temperature (1995) 3o, Encontro Brasileiro de Física dos Plasmas - Fifth Brazilian Plasma Astrophysics Workshop, , Águas de Lindóida, SP, 4-6 December 1995Campos, D.O., Machida, M., Berni, L.A., Kantor, M., Moshkalyov, S.A., Lebedev, S.V., Experimental study of conventional and multipass Thomson scattering diagnostics (1996) Japanese Journal of Applied Physics, 35 (12 A), p. 6273Campos, D.O., Machida, M., Berni, L.A., Kantor, M., Moshkalyov, S.A., Lebedev, S.V., The application of a multipass system for Thomson scattering diagnostics in magnetically confined plasmas (1996) Brazilian Journal of Physics, 26 (4), p. 742Sheffield, J., (1975) Plasma Scattering of Electromagnetic Radiation, , Academic Press, New Yor
Turbulent plane Couette flow with wall-transpiration
No full textIn the present abstract, DNS results obtained for turbulent plane Couette flow with wall-normal transpiration velocity are presented. Important equations valid in such a flow are derived, describing the total shear stress and the relation between the friction velocities at the lower and upper wall. These expressions are of importance, as there are neither experimental nor DNS data to compare with. Equally important, we derive a center region and a viscous sublayer velocity scaling for the suction wall, which were both validated using the DNS data
An experimental investigation of the azimuthal structures formed during the ablation phase of wire array z-pinches
No full textA series of wire array implosion experiments have been carried out on MAGPIE, a 1.4MA peak current, 240ns
rise-time pulsed power generator located at Imperial College London. The aim of these experiments was to investigate
the azimuthal structure of ablation plasma produced during the early stages of wire array implosions. Previous
work [Lebedev, S.V., et al., PoP, 2001] has demonstrated that a significant portion of the implosion time is
dominated by the ablation phase, during which the dense wire cores remain at their initial radius and ablate
streams of plasma towards the array axis. This ablation plasma prefills the array, and its distribution forms the
initial conditions for the eventual snowplough-like implosion.
In order to carry out this investigation a new two-colour end-on interferometry system was constructed. A custom
software suite was developed in order to analyse the resulting data, enabling the conversion of the raw interferograms
into 2D electron density maps.
The experiments focused on cylindrical tungsten and aluminium arrays of between 8 and 128 wires. The structures
observed in aluminium arrays were dominated by collisional features. Networks of oblique shocks were
formed as the ablation streams interacted with their neighbours. Analysis of these shock structures allowed an
estimate to be made for the Mach number of the ablation streams, M=7.9-8.2. In contrast, the structures observed
in the tungsten experiments were characterised by smooth density profiles, consistent with relatively long
ion mean free paths. The quantitative nature of the dataset makes it ideal for comparison with the results of numerical
simulations.
Also reported in this thesis is the development of two CW laser diagnostics, a quadrature interferometer, and a
Faraday current diagnostic. The design of these diagnostics is discussed and some examples of the analysis are
presented
Magnetic Reversal of In-Plane Anisotropic Garnet Films: Orientational Phase Transition Isolines
No full textThe results of experimental investigation of longitudinal hysteresis of epitaxial garnet films with "easy axis in plane" anisotropy using magnetooptical method are presented. The orientational phase transition isolines corresponding to change in magnetic reversal mechanisms at room (T=293 K) and near liquid nitrogen (T=90 K) temperatures are obtained by visual observation along easy axis of magnetization. It is shown that the regions of horizontal and sloped domains motion [1] are separated with certain interval of monodomain state that increases with increasing of transversal magnetizing. The threshold nature of sloped domains appearance is demonstrated
Correction to " Saint-Santin Radar Observations of Lower Thermospheric Storms"
No full textInternational audienceIn the paper "Saint-Santin Radar Observations of Lower Thermospheric Storms" by C. Mazaudier, R. Bernard and S.V. Venkateswaran (Journal of Geophysical Research 90 (A3), 2885-2895) the name of the third author was inadvertently omitted from the first page. A corrected first page follow
Pharmacotherapy for POAG. Individual approach
No full text
S.V. Balalin, V.P. Fokin
S. Fyodorov Eye Microsurgery Federal State Institution, Volgograd branch, Volgograd, Russian Federation
Glaucoma is still one of the leading causes of the blindness and low vision. According to the World Health Organization, an estimated number of glaucoma patients is 60.5 to 105 million and is growing steadily. In many highly developed countries, glaucoma accounts for 13–28% of blindness. High intraocular pressure (IOP) is the most important risk factor for glaucomatous optic neuropathy and low vision in primary open-angle glaucoma (POAG). It was demonstrated that IOP lowering to the individual tolerant level in POAG preserves vision for a long time.
The paper discusses potential adoption of of the software for the calculation of tolerant IOP in POAG. Tolerant IOP calculations will help to adjust treatment in time to achieve individual IOP normal ranges, to predict glaucoma stabilization or progression as well glaucoma progression rate. The algorithm of treatment strategy for POAG is described.
Key words: glaucoma, primary open-angle glaucoma, intraocular pressure, tolerant IOP, glaucomatous optic neuropathy, prostaglandin analogue, latanoprost, Trilactan.
For citation: Balalin S.V., Fokin V.P. Pharmacotherapy for POAG. Individual approach. Russian Journal of Clinical Ophthalmology. 2019;19(1):43–48.
About the authors:
Sergey V. Balalin — MD, PhD, Head of the Scientific Department of the Volgograd branch;
Viktor P. Fokin—MD, PhD, Professor, Director of the Volgograd branch.
S. Fyodorov Eye Microsurgery Federal State Institution, Volgograd branch. 80, Zemlyachki str., Volgograd, 400138, Russian Federation. Contact information: Sergey V. Balalin, e-mail: [email protected]. Financial Disclosure: no author has a financial or property interest in any material or method mentioned. There is no conflict of interests. Received 23.10.2018.<br
Analysis of Design Parameters of Highway Subgrade Soils in Southern Russia
No full textAbstractThe paper describes a methodology for analyzing the design humidity of subgrade soils under dry-land conditions in Southern Russia. The author has studied the strength characteristics of subgrade soils depending on their humidity and densit
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