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Search Results: 1 - 10 of 401641 matches for " M. Asif "
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Relationship between normalized thermal energy and conductivity for cylindrical tokamak geometry  [PDF]
M. Asif
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.21008
Abstract: The relation between normalized thermal en-ergy and conductivity, with no particle sources in cylindrical tokamak geometry has been de-rived. It is obtained, . This relationship is of importance for tokamak confinement and heating.
Magnetohydrodynamic equations for toroidal plasmas  [PDF]
M. Asif
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.22015
Abstract: A set of reduced MHD equations is derived us-ing the standard energy balance equation. By applying assumption of internal energy, i.e. , a set of reduced magnetohydro-dynamic equations are obtained for large aspect ratio, high tokamaks. These equations in-clude all terms of the same or der as the toroidal effect and only involve three variables, namely the ?ux, stream function and internal energy.
Study of Effective Edge Safety Factor Using Analytical Solution of Grad-Shafranov Equation for Circular Cross Section Tokamak  [PDF]
M. Asif
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.46102
Abstract:

In this work, we present effective edge safety factor using analytical solution of the Grad-Shafranov equation based on expansion of free functions of first order and magnetic probes for circular cross section HT-7 tokamak.

Approximate Methods for the Calculation of Plasma Internal Inductance for Circular Cross Section Tokamak  [PDF]
M. Asif
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.45081
Abstract:

Calculation of Plasma internal inductance (li) is essential in Tokamak plasma research. Much more plasma parameters such as the plasma current density profile, magnetohydrodynamics instability, and plasma energy confinement time can be determined by using this parameter. Discrete poloidal magnetic probes along with the diamagnetic loop can be utilized in measurement of the Plasma internal inductance (li). In this paper Plasma internal inductance (li) is studied by theoretical and experimental approach for HT-7 Tokamak plasmas. The results of two methods are in good agreement with each other.

Study of confinement improvement in presence of a MARFE in the HT-7 superconducting tokamak
Asif, M.;,;
Brazilian Journal of Physics , 2006, DOI: 10.1590/S0103-97332006000500036
Abstract: a new set of actively cooled toroidal double-ring graphite limiters have been developed on the ht-7 tokamk for long pulse operation. in this paper, a multifaceted asymmetric radiation from the edge (marfe) phenomena and improved particle confinement induced by a marfe, characterized by ha line emissions drops and the line-averaged density increase have been studied in the ht-7 ohmic discharges (where the plasma current ip=145 ka, loop voltage vloop =2-3 v, toroidal field bt =1.7 t, and zeff =2-8). it is found that the improved particle confinement phase exists for about 90 ms and the particle confinement time tp increased about 1.6 times.
Relationship between viscosity and conductivity for tokamak plasmas
Asif, M.;
Brazilian Journal of Physics , 2009, DOI: 10.1590/S0103-97332009000100011
Abstract: the relation between parallel viscosity and the parallel conductivity for tokamak plasma has been derived by combining ideal mhd equilibrium equations with the concept of universal profiles. it is obtained that the parallel viscosity π║ and parallel conductivity σ║ in a tokamak are related by π║σ║-1 = γ (u-u0)i/r, where u is the loop voltage, u0 is attributed to polarization, i is the toroidal current and r is the major radius of the machine. the coefficient γ depends on para- or diamagnetism and on toroidal effects and exhibits a weak dependence on the minor radius.
Chemistry and antioxidant activity of plants containing some phenolic compounds
Asif M
Chemistry Internatioanl , 2015,
Abstract: Natural antioxidants inhibit the adverse effects of the Reactive Oxygen Species produced in living things and enable to survive. Depending on this principle, humans started using some plant products to cure from various diseases. Natural products have proved of great health impact on human traditionally and scientifically. Moreover, the research has so far done in the field of natural antioxidants. Therefore, antioxidants have been traditionally used as well as experimentally proved beneficial. The antioxidant components of the natural products constitute the major source of human health promotion and maintenance. The nature is still the perfect source for health promotion and for the supplementation of safe drugs. Great attention is mandatory to explore many underestimated plants with highly effective antioxidant activity. Few classes of natural products have received as much attention as phenolics and polyphenols.
Analysis of disruptive discharges during density limit experiments on the HT-7 Tokamak
Asif, M.;Gao, X.;,;
Brazilian Journal of Physics , 2006, DOI: 10.1590/S0103-97332006000200011
Abstract: in this work, we discuss the preliminary analysis of some disruptive plasma discharges with a moveable graphite limiter on the ht-7 tokamak, which has been developed in order to investigate the influence of the horizontal plasma position on the density limit. what we have observed is that the m=2, mhd component dominates during almost the whole discharge duration, when the density limit is approached at values of the edge safety factor 3 < q(a) < 3.5. for the poloidal-magnetic-field fluctuations observed at the mirnov coils, mirnov-coil analysis shows that the m = 2 mode is unstable, which finally causes disruption.
Analysis of disruptive discharges during density limit experiments on the HT-7 Tokamak
Asif M.,Gao X.
Brazilian Journal of Physics , 2006,
Abstract: In this work, we discuss the preliminary analysis of some disruptive plasma discharges with a moveable graphite limiter on the HT-7 tokamak, which has been developed in order to investigate the influence of the horizontal plasma position on the density limit. What we have observed is that the m=2, MHD component dominates during almost the whole discharge duration, when the density limit is approached at values of the edge safety factor 3 < q(a) < 3.5. For the poloidal-magnetic-field fluctuations observed at the Mirnov coils, Mirnov-coil analysis shows that the m = 2 mode is unstable, which finally causes disruption.
Generalized -Bernstein-Schurer Operators and Some Approximation Theorems
M. Mursaleen,Asif Khan
Journal of Function Spaces , 2013, DOI: 10.1155/2013/719834
Abstract: We study statistical approximation properties of -Bernstein-Shurer operators and establish some direct theorems. Furthermore, we compute error estimation and show graphically the convergence for a function by operators and give its algorithm.
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