|
|
-
Title:
Heat Transfer In A Two-Layered Blood Flow Model In A
Narrow Tube
In Presence Of Magnetic Field
Author:
D. C. Sanyal, K. Das and S. Debnath
Comments:
8 pages, 7 figures
Abstract:
Blood flow in a narrow tube is described using the two-layered model in presence of an
external uniform magnetic field. The model consists of a core
region, enriched with various types of blood cells and a cell-free
peripheral plasma layer. Also the constant heat flux convective heat
transfer to fully developed blood flow is studied. The velocity and
temperature profiles are determined. The expressions for
friction-factor-Reynolds number product and Nusselt number are found
and their natures are shown graphically.
Title:
Generalized Symmetries and Some new Solution of the Fokker-Planck
Equation
Author:
A. Ouhadan, E.H. El Kinani, M. Rahmoune, A. Awane, A. Ammar and S. Essabab
Comments:
9 pages
Abstract:
In this paper, the third and fourth generalized symmetries of the
Fokker-Planck equation are directly computed. We show how to get
higher order generalized symmetries by using of the recursion
operators, and we derive some exact solutions.
Title:
MPZ : Minimum Propagation Zone for a Tridimensional
Superconductor.
Author:
M. El Khomssi, S. Saoud, M.Fikri
Comments:
12 pages
Abstract:
The implementation of a group of thermic stability criterion of a
superconductor presents a certain interest. Within this framwork,
many work are elaborated [2], [6], studying the unidimensional case.
It aims , in fact , at controlling a critic energy which is
associated to the solution of the intermediate equilibrium, called
instable normal state. The intended energy presents a sort of
threshold relative to thermic disturbances. In this paper , we will
present:
• A generalization of this critic energy which present a good approximation of the
quantity of energy able to transit the superconductor to a normal
state
• Some control estimations of this energy.
Title:
Chaos Control in the Nonlinear Bloch Equations using Recursive Active Control
Author:
U. E. Vincent, J. A. Laoye and R. K. Odunaike
Comments:
8 pages, 4 figures
Abstract:
The problem of chaos control in the nonlinear Bloch equations is considered
based on a modified active control technique. In the proposed control scheme
a recursive approach and active control mechanism are combined to design
control functions that drive the nonliner Bloch equations to a steady
state as well as track a desired trajectory in a systematic way. The
effeciency of the proposed Recursive Active Control (RAC) is demonstrated
with numerical simulations.
Title:
Hamiltoniens classiques et géométrie k-symplectique
Author:
A. Awane, A. Ammar, E. Azizi, S. Essabab, A. Ouhadan, E. H. El Kinani and M. Rahmoune
Comments:
9 pages
Abstract:
We put in obviously hamilonian maps of classical mecanics in the
context of the polarized Poisson manifolds.
Title:
UWB channel model in frequency domain based on propagation phenomenon analysis
Author:
R. Saadane, A. Khafaji
Comments:
11 pages, 10 figures
Abstract:
By studying and understanding the characteristics of the channel
measurement data, a simple Line-of-Sight Ultra Wide Bandwidth
channel (UWB) model in frequency--domain (FD--model) for the small
scale description of the frequency--selective channel is presented.
The proposed model is motivated by analysis of physical propagation
phenomenon in UWB context. The performances of proposed model are
evaluated over $3\,$ GHz of frequency bandwidth. In this work, the
agreement between the experimental and simulated results is only
qualitative. The suitability of this channel model is evaluated by
comparing channel function transfer in frequency domain (resp. time
domain). Also, we have compared the $\tau_{rms}$ and $\tau_{m}$
parameters for simulated channel and measured one. The evolution of
number of Degree of Freedom (DoF) for simulated channel is in
agreement with number of DoF for measured channel. Additionally, a
simple description is presented for used measurements data. Other
features of this proposed model also are discussed.
Title:
Jeans' Gravitational Instability of Rotating Plasma
Author:
Aiyub Khan, S. S. Tak and Neha Sharma
Comments:
10 pages, 6 figures
Abstract:
he gravitational instability of infinitely extending homogeneous
rotating plasma permeated by an oblique magnetic field is
considered. The solution has been obtained through the normal mode
technique and dispersion relation has been derived. It is shown that
Jeans' criterion remains unchanged in the present problem. The
dispersion relation obtained has been solved numerically and it has
been found that the Coriolis forces and viscosity have a stabilizing
influence while Hall current and magnetic resistivity have
destabilizing influence on the growth rate of the unstable mode of
disturbance.
Title:
Quantum Entanglement -- A Primer
Author:
J P Singh
Comments:
28 pages
Abstract:
The phenomenon of ``quantum entanglement'' and the related ``EPR
paradox'' has been mystifying physicists ever since Einstein,
Podoloky \& Rosen published their gedanken experiment in 1935.
However, the existence of quantum entanglement is, now,
theoretically and experimentally well established. In fact, quantum
entanglement is being looked upon as the cardinal resource in
quantum communication, quantum computing and other information
processing activities to the extent that it could revolutionize the
world of information technology. This is despite the fact that an
unquestionable physical explanation of entanglement continues to
elude all human endeavours. In this review, we present a bird's eye
view of all facets of this intriguing phenomenon. Starting from the
pre-requisites (Section 2), we introduce ``quantum entanglement'' in
Section 3. We, then, look at the scheme of measurement of the degree
of entanglement in terms of ``Wootters Concurrence'' \&
``Entanglement of Formation''. Using quaternions, we study the
geometry of the single and two qubit states of quantum computing.
Through the Hopf fibrations, we identify geometric manifestations of
the separability and entanglement of two qubit quantum systems.
Thereafter, we present the salient features of the EPR experiment
and the Bohm's version thereof in terms of particle spins. Possible
schemes of resolution of the EPR paradox in terms of Bohr's
Complementarity Principle, time retroaction and Bohm's ``quantum
potential'' are also discussed. Anomalies resulting from the von
Neumann scheme of quantum measurement are also touched upon. A
comprehensive list of references supports this review.
Copyright
© African Journal of Mathematical Physics |
