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- Volume 33, issue 1, 2023 (5 papers)
- Volume 32, Issue 1, 2022 (6 papers)
- Volume 32, Issue 2, 2022 (5 papers)
- Volume 31, Issue 1, 2021 (6 papers)
- Volume 31, Issue 2, 2021 (6 papers)
- Volume 30, Issue 1, 2020 (7 papers)
- Volume 30, Issue 2, 2020 (6 papers)
- Volume 29, Issue 1, 2019 (6 papers)
- Volume 29, Issue 2, 2019 (6 papers)
- Volume 21, Issue 1, 2014 (12 papers)
- Volume 16, Issue 1, 2012 (10 papers)
- Volume 19, Issue 2, 2012 (13 papers)
- Volume 20, Issue 3, 2012 (13 papers)
- Volume 14, Issue 2, 2011 (10 papers)
- Volume 12, Issue1, 2010 (16 papers)
Transport Behavior and Low Field Magnetoresistance of Polycrystalline La0.63Y0.07Sr0.30MnO3 and La0.
Corresponding Author : M. Nahar (fahimdu@gmail.com)
Abstract :
Polycrystalline manganites of nominal chemical compositions La0.63Y0.07Sr0.30MnO3 and La0.63Y0.07Ba0.30MnO3 sintered at 1673K were investigated to observe transport properties and low field magnetoresistance (MR). XRD measurements confirmed formation of single phase pseudocubic perovskite structure. The temperature dependent DC transport properties showed a metalsemiconductor transition. A giant negative magnetoresistance (GMR) effect is observed at transition temperature in presence of magnetic field; which is mainly attributed to the intrinsic properties of grains and random fluctuation of electron-phonon spin interaction due to phase transition.…
Acceleration Techniques for Vortex Method Calculations: Part I
Corresponding Author : T. K. Sheel (tksheel@sust.edu)
Abstract :
A fast vortex method has been developed by using special-purpose computers, MDGRAPEs, those were exclusively designed for molecular dynamics simulations. This is an attempt to make a bridge between vortex method and molecular dynamics calculations. The three main issues have been solved regarding the implementation of the MDGRAPE on vortex methods those are the efficient calculation of the Biot-Savart and stretching equation, the optimization of the table domain, and the round-off error caused by the partially single precision calculation in…
An Optical Model Study of the Scattering of Protons from 3He
Corresponding Author : S. K. Das (skdas-phy@sust.edu)
Abstract :
An optical model analysis has been performed on the elastic scattering of protons from 3He at
Ep
= 6- 12 MeV. The data include only angular distribution. A reasonably good fits could be
obtained using the surface absorption potential. Discrete ambiguities are also found in the
present work.
Correlation based Signal Sensing for Cognitive Radio
Corresponding Author : Mohammed Alamgir (alamgir99@gmail.com)
Abstract :
One strong weakness of the energy detector is that it requires accurate estimation of the noise power. If the noise estimation is imperfect then the false alarm rate goes high and the detection performance worsens [9, 10]. This apparent problem with the noise can be avoided by taking advantage of its statistical property. The noise in radio receivers is known to be temporally white because the main source of it being the temperature variation in the low noise amplifier…
Direction of Arrival Estimation of OFDM Signals Using Cyclostationarity
Corresponding Author : Mohammed Alamgir (alamgir99@gmail.com)
Abstract :
Direction of arrival estimation has many applications in communications. Though MUSIC and ESPRIT are by far the mostly studied algorithms, there have been growing interests in cyclostationarity based algorithms for their higher selectivity. In addition to carrier frequency and baud rate, OFDM signals show cyclostationarity caused by the cyclic prefix. In this paper we have studied the direction finding problem of OFDM signal making use of the cyclostationarity property. For this, we have modified the Cyclic MUSIC algorithm and applied…
Dynamics of Evolutionary Epidemiological SIR Model with Varying Total Population Size
Corresponding Author : M. A. Haque (aminul202@yahoo.com)
Abstract :
Infectious diseases have often had a big impact on population sizes and historical events. Therefore, the constant population size models are not often suitable when the natural births and deaths are not balanced or when the disease-related deaths are significant. Moreover mutation of Pathogens is an important phenomenon of the disease dynamics, as pathogens can reproduce quickly. As a consequence, in this paper the evolutionary behavior of SIR model considering variable population size has been studied. The resident strain and…
Effect of the Normal Optical Potential on the D(d,n)3He Reaction
Corresponding Author : S. K. Das (skdas-phy@sust.edu)
Abstract :
The optical model parameters were employed in the studies of nuclear reaction D(d,n)3He at several energies within the framework of the DWBA method of direct reaction. Various sets of optical model potentials were tried in the incident channel, while the n- 3He potentials were used in the exit channel. A fairly good description of the reaction was possible. The spectroscopic factors obtained in this way were around approximately half of these expected from the simple shell model. The reaction was…
Generation of Response Spectra Along With Time History for Earthquake in Dhaka for Dynamic Analysis
Corresponding Author : A.B.M. Saiful Islam (abm.saiful@gmail.com)
Abstract :
Earthquakes subject structures to time varying-forces which, in turn, produce time-varying displacements and stresses within the structures. From a design view point, only the maximum values of displacement and stress are of interest—the variation with time of these quantities is of little consequence. For survival the structure must withstand the peak value whenever that may occur. Therefore only the peak value is needed to be known to successfully design a building and this information is made available in the form…
In Silico Identification of Suitable Alternative Milk for Human Infants either Allergic or Not to Co
Corresponding Author : Shakhinur Islam Mondal (shakhin2000@yahoo.com)
Abstract :
The issue of nutrition is of great concern in case of infants. Although mother’s milk is the primary source of nutrition for infants, during deficient condition they should be provided with alternative supplement, where cow milk is the general choice. However, cow milk proteins are found to be allergic to few. Milk of some other mammals or soy milk has been tried as alternative protein source to allergic infants. The current study has disclosed the best alternative to mother’s milk…
Study of Elastic Properties of Ammonium Iodide (NH4I) with NaCl Structure
Corresponding Author : S. M. Sharif (sharif-phy@sust.edu)
Abstract :
Second-order elastic constants, third-order elastic constants and some other lattice properties of NH4I crystal have been calculated here using a modified form of the Born model of ionic solids. In the expression of total energy we have used long-range Coulomb, short-range BornMayer repulsive and van der Waals dipole-dipole, dipole-quadrupole potentials. The shortrange repulsive interactions have been included up to second nearest-neighbors. The present study shows that the computed values of different lattice properties are consistent with the available experimental and…