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Coincidence Points and Invariant Approximation Results for Multimaps

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Acta Mathematica Sinica,English Series 2007年第9期23卷 1601-1610页

作者： Donal O'REGAN naseer shahzad Department of Mathematics National University of IrelandGalwayIreland Department of Mathematics King Abdul Aziz University

Some coincidence point theorems satisfying a general contractive condition are proved. As applications, some invariant approximation results are also obtained and several related results in the literature are either e... 详细信息

关键词： coincidence point weak commutativity best approximant

Generalized Ⅰ-Nonexpansive Selfmaps and Invariant Approximations

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Acta Mathematica Sinica,English Series 2008年第5期24卷 867-876页

作者： M.A.AL-THAGAFI naseer shahzad Department of Mathematics King AbduIAziz UniversityP.O.Box 80203Jeddah 21589Saudi Arabia

Common fixed point results for new classes of noncommuting selfmaps satisfying generalized I-contraction or I-nonexpansive type conditions are established. We apply them to obtain several invariant approximation resul... 详细信息

关键词： common fixed point occasionally weakly compatible map ultraoccasionally weakly compatible map generalized I-nonexpansive map invariant approximation

AN APPLICATION OF A FIXED POINT THEOREM TO BEST SIMULTANEOUS APPROXIMATION

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Analysis in Theory and Applications 1994年第3期10卷 1-4页

作者： Isinat Beg naseer shahzad Kuwait University Kuwait Quaid-i-Azam University Pakistan

Using a recent result regarding the fixed points of multivalued mappings, the existence of invariant best simultaneous approximation in chainable metric space is proved.

关键词： AN APPLICATION OF A FIXED POINT THEOREM TO BEST SIMULTANEOUS APPROXIMATION

ON INVARIANT RANDOM APPROXIMATIONS

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Analysis in Theory and Applications 1996年第3期12卷 68-72页

作者： Ismat Beg naseer shahzad Kuwait Unrversity KuwaitQuaid-i-Azam Umiversity Pakistan

A result regarding invariant random approximation is proved.

关键词： ON INVARIANT RANDOM APPROXIMATIONS

PREPARATION OF THERMALLY EVAPORATED CdTe THIN FILMS

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Chinese Physics Letters 1990年第11期7卷 510-513页

作者： shahzad Naseem naseer-ud-Din Khadim Hussain Centre for Solid State Physics University of the PunjabQuaidCampusLahorePakistan

Thin films of cadmium telluride were prepared by evaporating cadmium telluride powder in a vacuum of less than 10^(-4) *** substrate temperature was varied systematically from room temperature to 300℃.The results of optical and structural characterizations have revealed that the films posses a high value of absorption coefficient with a bandgap value m the range 1.475-1.769eV,and that the films are of cubic structure with a preferred orientation along(111)*** probe measurements have shown that resistivity of these films is affected by the change in substrate temperature,with the lowest value(12.6 Ω·cm)being at 200℃.

关键词： films value cadmium

CANONICAL FORMS OF NIELSEN’S AND CENOV’S DYNAMICAL EQUATIONS

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Acta Mechanica Sinica 1993年第2期9卷 171-176页

作者： naseer Ahmed Mathematics Department Quaid-i-Azam UniversityIslamabadPakistan

In this paper,with Poincare's formalism,and an indirect method,the canonical forms of the generalized equations of motion due to Nielsen and Cenov of a holonomic dynamical system in the velocity-phase space and the ac... 详细信息

关键词： holonomic dynamic system Nielsen's equations of motion Poincare's equations of motion

Anisotropic extensions of isotropic Finch–Skea metric in the charged modified gravity

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Communications in Theoretical Physics 2024年第9期76卷 118-140页

作者： Tayyab naseer M Sharif Department of Mathematics and Statistics The University of Lahore1-Km Defence RoadLahore 54000Pakistan

In this study,we explore the Finch–Skea perfect fluid solution and extend its domain to three distinct anisotropic interior models within the framework of the f(R,T)theory,incorporating the influence of an electromagnetic *** assume a static spherical spacetime initially coupled with an isotropic matter *** then introduce a Lagrangian corresponding to an additional gravitating source,taking into account its role in inducing pressure anisotropy within the original fluid *** deriving the field equations for the combined matter setup,we applied a radial component transformation,which yielded two distinct systems of *** addition,we consider a charged exterior spacetime to determine the three constants associated with the Finch–Skea solution at the *** findings suggest that under certain parametric choices,all three resulting models exhibited physical relevance within this modified theory.

关键词： anisotropy modified gravity gravitational decoupling

The peculiar velocity and temperature profile of galaxy clusters

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Research in Astronomy and Astrophysics 2014年第6期14卷 667-672页

作者： Tabasum Masood naseer Iqbal Department of Physics Kashmir University Inter University Centre for Astronomy and Astrophysics IUCAA

Dynamical parameters like average velocity dispersion and temperature profile of galaxy clusters are determined using the theory of quasi-equilibrium ther- modynamics. The calculated results of velocity dispersion show a good agreement between theory and simulations with the results of velocity dispersion from Abdullah et al. An adaptive mesh refinement grid-based hybrid code has been used to carry out the simulations. Our results indicate that the average velocity dispersion profile of 20 Abell galaxy clusters falls in the range of 500 - 1000 km s^-1 and their temperature profile is of the order of 10^7 to 10^8 K calculated on the basis of kinetic theory. The data in the plot show a significant contribution from gravitating particles clustering together in the vicinity of the cluster center and beyond a certain region this veloc- ity dies out and becomes dominated by the Hubble flow due to which all the galaxy clusters in an expanding universe participate in Hubble expansion.

关键词： galaxies: clusters -- gravitation -- simulations

Conservation Laws for Partially Conservative Variable Mass Systems via d＇Alembert＇s Principle

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Chinese Physics Letters 2008年第9期25卷 3181-3184页

作者： AFTAB Ahmed naseer Ahmed QUDRAT Khan Department of Mathematics Quaid-I-Azam University 45320 Islamabad 44000 Pakistan

Conservation laws for partially conservative variable mass dynamical systems under symmetric infinitesimal transformations are determined. A generalization of Lagrange-d ＇Alembert＇s principle for a variable mass system in terms of asynchronous virtual variation is presented. The generalized Killing equations are obtained such that their solution yields the transformations and the associated conservation laws. An example illusstrative of the theory is furnished at the end as well.

关键词： the power-law exponents precipitation durative abrupt precipitation change