1Department of Physics, National Institute of Technology ,Srinagar Kashmir India
2Mechanical Engineering Department National Institute of Technology Srinagar India
Characteristics of nighttime VLF/ELF emissions are examined on the basis of the data obtained at a low latitude ground station Jammu (geomag. lat., 22o 26' N; L = 1.17), India during our VLF/ELF campaign. From the detailed analysis of the acquired VLF/ELF data at Jammu we have found two remarkable events which clearly exhibit a rise in their frequency with time in pre midnight sectors during magnetically quiet periods. Our analysis shows that the emissions observed are of hiss and hissler types and are recorded during magnetically quiet period followed by disturbances. The observed frequency drift in VLF/ELF emissions at Jammu seems to be a rare phenomenon at low latitudes during magnetically quiet period in pre midnight sectors. This property of temporal frequency drift in VLF/ELF emissions observed at our station Jammu are interpreted in terms of a electron-cyclotron wave-particle interaction for wave excitation. The initial frequency increase is believed to be due to combined effect of L-shell drift of energetic electrons.
1NM Institute of Engineering and Technology Sijua Bhubaneswar India
2Former Professor of Physics Serc Bhubaneswar India
3Research Scolar, Institute of Mathematics and Applications Bhubaneswar India
This paper deals with the theoretical investigation of the heat and mass transfer effects on the marginal stability of a rotating ferrofluid heated below saturating a porous medium. For a flat fluid layer contained between two free boundaries, an exact solution is obtained using a linear stability analysis theory normal mode analysis method. For the
case of stationary convection, the effect of various parameters like medium permeability, dust particle coupling parameter and conduction parameter has been analyzed. The critical thermal Raleigh number for the onset of instability is also determined numerically. Results are depicted graphically. It is observed that the critical thermal Rayleigh number is reduced because the heat capacity of clean fluid is supplemented by that of the dust particles. The principle of exchange of stabilities is found to hold true for the ferrofluid with internal angular momentum saturating porous medium in the absence of dust particles, coupling parameter and micro inertia. The oscillating modes are introduced due to the presence of dust particles, coupling parameter and micro inertia, which were nonexistent in their absence. The sufficient conditions for the non existence of stability are also obtained.
*Department of Mathematics, Dr B.R. Ambedkar University Agra
**Department of Mathematics, Govt Degree College Mant Mathura UP India
Email:-sanjeevibs@yahoo.co.in
A model of biomagentic fluid dynamics, which is suitable for
the description of the MHD Couette flow of a viscous-incompressible
fluid, is discussed in this work. Here we take two infinite horizontal
parallel porous flat plates. The upper plate is subjected to a constant
suction while the lower plate is to a transverse sinusoidal injection along
with the velocity distribution. In this work finite difference method is
used for solving the non-linear partial differential equations and our
results shows that the main flow component (U) decreases with the
increase of Hartmann number (M) and the velocity decreases with the
increases of the injection suction parameter (R). Here we also investigate
the effects of Hartmann number (M) and suction parameter (R)
along with the velocity and temperature distribution.
1Department of Basic Science U.P. Textile Institute Kanpur UP India
2Department of Physics T.D. College Jaunpur U.P India
3Department of Applied Science and Humanities, Buddha Institute of TechnologyCl-1Gida Gorakpur U.P.India
Email:- dev07.2007@rediffmail.com
In the present paper a new method has been developed to evaluate decay parameters and order of kinetics by analyzing thermoluminescence (TL) glow curve. It has been observed that the decay parameters are characteristic feature of the system under investigation whereas order of kinetics does not. Extents of recombination and simultaneous retrapping decides the order of kinetics involved in the T L process. Order of kinetics increases with extent of retrapping within the system. TL decay parameters, order of kinetics and initial concentration of trapped electrons per unit volume are evaluated easily and conveniently following the proposed method of analysis.
Department of Mathematics, T.B.M.L College Porayar India
In this article the authors attempted to identify the part of the coastal area affected much and to ascertain the group of affected people (based on region) due to Tsunami in Karaikal district during the year 2004.
1,2Department of Mathematics, S.V. College Aligarh U.P. India
The effect of heat transfer on the flow of visco-elastic conducting fluid of Rivlin – Ericksen type flowing down an inclined plane in presence of a transverse magnetic field is investigated. This type of problem finds application in many technological and engineering fields such as rocket propulsion systems, space craft re-entry aerothermodynamics, cosmical flight aerodynamics, plasma physics, Glass production and furnace engineering. Velocity of the flow has been presented for various parameters. In this study velocity of fluid increases with the increase in Gr (Grashof number), but it decreases with the increase in H (Hartmann number) and Pr (Prandtl number).
1,2Department of Mathematics, S.V. College Aligarh U.P. India
The effect of heat transfer on the flow of visco-elastic conducting fluid of Rivlin – Ericksen type flowing down an inclined plane in presence of a transverse magnetic field is investigated. This type of problem finds application in many technological and engineering fields such as rocket propulsion systems, space craft re-entry aerothermodynamics, cosmical flight aerodynamics, plasma physics, Glass production and furnace engineering. Velocity of the flow has been presented for various parameters. In this study velocity of fluid increases with the increase in Gr (Grashof number), but it decreases with the increase in H (Hartmann number) and Pr (Prandtl number).
1Department of Mathematics D.S. College Aligarh U.P.India
2Department of Mathematics, S,V,College Aligarh U.P.India
The purpose of present study is to analyze the effect of porous medium on unsteady flow of dusty visco-elastic second order Oldroyd fluid with transient pressure gradient through a rectangular. Here we considered the second order Oldroyd fluid and investigate the same problem in this new visco-elastic model. The numerical expressions of the liquid velocity and particle velocity have been given.
*Department of Mathematics, Sree Vidyaniketan Engineering College Tirupati A.P.India
**Department of Mathematics, G pullareddy Engg College Auto Kurnool A.P. India
***Professor, Department of Mathematics S.V University Tirupathi A.P. India
Email:-agvijaykumar1729@gmail.com Email:- nandagopal15135@gmail.com Email:- svijayakumarvarma@yahoo.co.in
An analytical study is performed is to investigate thermal diffusion and radiation effects on unsteady MHD flow past an inclined plate with variable temperature and mass diffusion in the presence of heat source or sink under the influence of applied transverse magnetic field. The fluid considered here is a gray, absorbing/ emitting radiation but a non-scattering medium. At time t>0, the plate is exponentially accelerated with a velocityu u expat 0 in its own plane. And at
the same time, the plate temperature and concentration levels near the plate raised linearly with time t. The dimensionless governing equations involved in the present analysis are solved using the Laplace transform technique. The velocity, temperature, concentration, the rate or heat transfer and the rate of mass transfer are studied through graphs and tables in terms of different physical parameters like magnetic field parameter (M), radiation parameter (R), heat source parameter (H),
Schmidt parameter (Sc), inclination parameter ( ), soret number (So),
Prandtl number (Pr), thermal Grashof number (Gr), mass Grashof number
(Gm) and time (t).
1,2Asstt Prof. -Education RIE Bhopal India
The CCE or Continuous and Comprehensive Evaluation scheme refers to a school based evaluation of students that covers all the aspects of a student’s development. It emphasizes two fold objectives of continuity in evaluation on the one hand and assessment of broad range of behavioural outcome on the other. Continuous means continuity and regularity of assessment during the whole session. Comprehensiveness means the areas of assessment which includes both scholastic and co-scholastic aspect of pupils growth helping the all round development of child. Therefore, the CCE scheme brings about a paradigm shift from examination to effective pedagogy.
Conventionally the teacher is seen as the information giver; knowledge flows only one way, from teacher to student. In a collaborative classroom (or the CCE method), emphasis is on shared knowledge and decision making. For some teachers finding time for planning collaborative instruction is a most difficult challenge. In a changed scenario, a teacher ought to maintain a number of records like child’s portfolios, anecdotal records, prepare checklists, rubrics for assessment. Practicing modes and modalities of CCE is a challenge before traditional teachers. Therefore it is absolutely essential that teachers need to be provided with orientation about the CCE scheme incorporating both the
scholastic and co-scholastic areas of learners’ growth. In order to make CCE effective there has to be collective understanding among all concern i.e. child, teacher, parent and institutions of higher education about what is being evaluated.