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Search Results: 1 - 10 of 1687 matches for " Jahrul Alam "
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Travelling Waves: Interplay of Low to High Reynolds Number and Tan-Cot Function Method to Solve Burger’s Equations  [PDF]
Md. Kamrujjaman, Asif Ahmed, Jahrul Alam
Journal of Applied Mathematics and Physics (JAMP) , 2019, DOI: 10.4236/jamp.2019.74058
Abstract: We study the nonlinear parabolic equations for travelling wave solutions of Burger’s equations. The purpose of the present work is to study various types of Burger’s equations describing waves and those are based on nonlinear equations. We focus on to describe the analytic solution in the special pattern of travelling wave solutions using tan-cot function method. We discuss about inviscid and viscous version of Burger’s equation for fluid flow and investigate the effects of internal friction of a fluid via Reynolds number. By changing the velocity amplitude, the nature of flows with shock wave and disturbance are observed. For numerical solutions, the Crank-Nicolson scheme is introduced to establish the wave solutions.
A multiscale modeling study for the convective mass transfer in a subsurface aquifer
Jahrul M. Alam
Physics , 2013, DOI: 10.1007/s00231-014-1490-2
Abstract: Quantitative and realistic computer simulations of mass transfer associated with CO2 disposal in subsurface aquifers is a challenging endeavor. This article has proposed a novel and efficient multiscale modeling framework, and has examined its potential to study the pen- etrative mass transfer in a CO2 plume that migrates in an aquifer. Nu- merical simulations indicate that the migration of the injected CO2 enhances the vorticity generation, and the dissolution of CO2 has a strong effect on the natural convection mass transfer. The vorticity decays with the increase of the porosity. The time scale of the vertical migration of a CO2 plume is strongly dependent on the rate of CO2 dissolution. Comparisons confirm the near optimal performance of the proposed multiscale model. These primary results with an idealized computational model of the CO2 migration in an aquifer brings the potential of the proposed multiscale model to the field of heat and mass transfer in the geoscience.
Pressure drag and skin friction effects in a miscible flow through porous media
Jahrul M Alam,M. Jalal Ahammad
Physics , 2014,
Abstract: Understanding miscible flow of CO$_2$ and oil in a porous media is an important topic in the field of petroleum engineering. In this article, we present an upscaling methodology for displacing oil by CO$_2$, and study the statistical mechanical theory to develop a subgrid scale model for the effect of CO$_2$-oil dissolution on the overall skin friction and pressure drag experienced by the porous media. We present a multiscale computational methodology for a near optimal calcuation of the velocity and pressure. We study the field scale sweep efficiency using a streamline based Lagrangian scheme. The simulation results show a good agreement with asymptotic analysis results.
Penetrative turbulence associated with mesoscale surface heat flux variations
Jahrul M. Alam,M. Alamgir Hossain
Physics , 2015,
Abstract: This article investigates penetrative turbulence in the atmospheric boundary layer. Using a large eddy simulation approach, we study characteristics of the mixed layer with respect to surface heat flux variations in the range from 231.48 W/m$^2$ to 925.92 W/m$^2$, and observe that the surface heterogeneity on a spatial scale of $20$ km leads to downscale turbulent kinetic energy cascade. Coherent fluctuations of mesoscale horizontal wind is observed at 100m above the ground. Such a surface induced temporal oscillations in the horizontal wind suggest a rapid jump in mesocale wind forecasts, which is difficult to parameterize using traditional one-dimensional ensemble-mean models. Although the present work is idealized at a typical scale (20km) of surface heterogeneity, the results help develop effective subgrid scale parameterization schemes for classical weather forecasting mesoscale models.
Discretization of the Poisson equation using the interpolating scaling function with applications
Jahrul Alam,Raymond Walsh,Alamgir Hossain,Andrew Rose
Physics , 2013,
Abstract: Dyadic translations of the interpolating scaling function generate a basis that can be used to approximate functions and develop a multiresolution methodology for constructing smooth surfaces or curves. Many wavelet methods for solving par- tial differential equations are also derived from the interpolating scaling function. However, little is done for developing a higher order numerical discretization methodology using the scaling function. In this article, we have employed an iterative interpolation scheme for the construction of scaling functions in a two- dimensional mesh that is a finite collection of rectangles. We have studied the development of a weighted residual collocation method for approximating partial derivatives. We show that the discretization error is controlled by the order of the scaling function. The potential of this novel technique has been verified with some representative examples of the Poisson equation. We have extended the technique for solving nonlinear advection-diffusion equations, and simulated a shear driven flow in a square cavity at CFL = 2.5 (Courant Friedrichs Lewy) and Re = 1 000 (Reynolds number). Agreement with the reference solution at a large CFL = 2.5 explores the potential of this development for advection dominated problems.
Trousseau’s sign  [PDF]
Anwar Alam
Case Reports in Clinical Medicine (CRCM) , 2013, DOI: 10.4236/crcm.2013.25087
Abstract: The trousseau’s sign is carpopedal spasm that results from ischemia that is induced by pressure applied to the upper arm. It is a sensitive and specific sign of hypocalcemia. Here the author is sending the short case summary, images of the demonstration of the Trousseau’s sign. This case also had a cluster of seizures induced by hypocalcemia.
Role of Knowledge Engineering in the Development of a Hybrid Knowledge Based Medical Information System for Atrial Fibrillation  [PDF]
Aankita Kaur, Mansaf Alam
American Journal of Industrial and Business Management (AJIBM) , 2013, DOI: 10.4236/ajibm.2013.31005
Abstract:

In this paper, we are describing role of knowledge engineering in the development of a hybrid knowledge based medical information system. Knowledge engineering plays important role in development of various technologies such as: expert systems, neural network, artificial intelligence, hybrid intelligent systems, data mining, decision support systems, and knowledge based systems etc. The hybrid medical information system mainly consists of medical information system and medical knowledge base systems. These poly techniques of knowledge engineering when integrated with hybrid techniques of intelligent systems for designing, implementing knowledge bases to deal with medical informational data of Atrial Fibrillation. Atrial Fibrillation is the most common heart rhythm disorder which increases the risk of mortality and morbidity.

Inhibition of Toxic Effects of Viper and Cobra Venom by Indian Medicinal Plants  [PDF]
M. I. Alam
Pharmacology & Pharmacy (PP) , 2014, DOI: 10.4236/pp.2014.58093
Abstract:

The mortality rate from snakebites in West Bengal is very high and most of the deaths are caused by the Daboia russelli and Naja naja envenomation. Twenty-three plants from the seventeen families were collected from the traditional healers and explored for the first time for antisnake venom activity. In our previous report, the methanolic root extract of the Indian medicinal plants Pluchea indica, Hemidesmus indicus, Vitex negundo and Emblica officinalis significantly neutralized the Viper and Cobra venom-induced pathophysiological changes [1][2]. In the present study, we explored four plant extracts (Curcuma aromatica, Aristolochia indica, Androgrphis paniculata and Curcuma zeodaria) for the antisnake venom activity. The plant extracts significantly antagonized Daboia russelli, Echis carinatus

Tsunami Impacts on Nuclear Power Plants along Western Coast of India Due to a Great Makran Earthquake: A Numerical Simulation Approach  [PDF]
Mohd Zuhair, Shahnawaz Alam
International Journal of Geosciences (IJG) , 2017, DOI: 10.4236/ijg.2017.812083
Abstract:
The major seismicity source in the northern Arabian Sea is the Makran Subduction Zone (MSZ) that defines the tectonic boundary between the Arabian plate and the Eurasian plate, located offshore Iran and Pakistan over which an instrumentally registered earthquake (Mw 8.1) generated a tsunami on 27 November, 1945. It has caused severe cataclysm to a vulnerable population along the surrounding coastlines, including India. It has been on a long seismic quiescence since this last event. The population and industrialization have exponentially increased along the coastal areas in last half decade. The highly exposed coastal locations to the tsunamis are the areas where the nuclear power plants are located. In the present work, a numerical simulation of a great tsunamigenic earthquake (M 9) is presented that predicts the generation, propagation, run-up and travel time using TUNAMI N2 for estimating tsunami impacts along the nuclear power plants of the western coast of India. TUNAMI N2 code was designed for shallow water wave equations, which uses the finite-difference method based on staggered-leap frog scheme. Thus, it has potential to simulate a far-field tsunami with much more accuracy than other methods. It is observed that the tsunami will strike along the coast of Jaitapur Nuclear Power Plant (Maharashtra), Tarapur Nuclear Power Plant (Maharashtra), Kaiga Nuclear Power Plant (Karnataka) and Mithi-Virdi Nuclear Power Plant (Gujarat) after 210, 215, 225 and 230 minutes, respectively. Results show that the tsunami run-up is highest for Jaitapur coast (2.32 m). The Mithi-Virdi coast is the least effected (0.93 m) while Kaiga (2.15 m) and Tarapur coast (2.12 m) might have faced quite intense tsunami consequences. The arrival times and run-ups of the tsunami along the coast of different power plants have been calculated since these parameters are of vital importance in mitigation of the coastal hazard, evacuation planning and installation of early warning system in order to save the inhabited communities from the disaster.
Enforcement of Intellectual Property Rights in Bangladesh: To What Extent Is It TRIPS-Responsive?  [PDF]
Mohammad Aktarul Alam Chowdhury
Beijing Law Review (BLR) , 2018, DOI: 10.4236/blr.2018.93026
Abstract: In recent times with the adoption of TRIPS we observe that enforcement of Intellectual Property Rights (IPRs) has emerged as a pressing issue on the global economy, and in the national and international intellectual property agenda. Particularly, whilst the WTO definitely promotes big IP exporters, scholars are tremendously worried about TRIPS “one size fit all” attitude that ultimately disregards the heterogeneity of the world’s populace and the exertions that threatens developing and least developed countries. The big and vital challenge facing by the developing country like Bangladesh today is how to cope with the mounting number of demands from intellectual property rights-holder, national and foreign, to upgrade their system for the enforcement of IPRs. And the effort of Bangladesh, in this respect, is not totally insignificant, for as a WTO family member Bangladesh imperatively needs to make it its IP regime TRIPS-responsive by 2021 starting from 1 July 2013. In this environment, this paper seeks to address briefly how the intellectual property rights are enforced in Bangladesh and to what extent the IPRs implementation and enforcement mechanism in Bangladesh is TRIPS-compliant. Finally this paper tries to put some recommendations to meet the WTO obligations using the TRIPS flexibilities.
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