http://www.i-scholar.in/index.php/ENIABC/issue/feedEngineering International2014-10-21T11:26:08+00:00Dr. Alim Al Ayub Ahmedabcjournals@gmail.comOpen Journal Systems<div id="i-scholarabout">Engineering International (EI) is a blind peer reviewed, open access international scientific journal committed for speedy publication of high quality original research articles as well as review articles in all aspects of engineering disciplines and its applications. Engineering International is published by Asian Business Consortium.</div>http://www.i-scholar.in/index.php/ENIABC/article/view/54732Improved Understanding of K-e Turbulence Model for Non-homogeneous Two-phase Flows in Industrial Combustor2014-10-21T11:26:05+00:00Nguyen Thanh HaoThis paper presents development of k- turbulence model which can be applied for non-homogeneous two-phase turbulent flows. The improvement of governing equations of k- turbulence model is based on the decomposition of the two-phase flows into the gas phase and the second phase. Thus, the turbulent kinetic energy k and the turbulent dissipation rate variables in k- two-equation model are substituted by the turbulent kinetic energy kg of the gas phase, the turbulent kinetic energy kp of the second phase, the turbulent dissipation rate g of the gas phase and the turbulent dissipation rate p of the second phase. The new turbulence model is kg-kp- g-p four-equation model which can be used to solve all of two-phase flows in nature studies and engineering applications.http://www.i-scholar.in/index.php/ENIABC/article/view/54733Multipurpose Tactical Robot2014-10-21T11:26:05+00:00Taher Uz ZamanSazzad AhmedShabbir HossainShakhawat HossainG. R. Ahmed JamalThis paper presents a general framework for planning a multipurpose robot which can be used in multiple fields (both civil and military). The framework shows the assembly of multiple sensors, mechanical arm, live video streaming and high range remote control and so on in a single robot. The planning problem is one of five fundamental challenges to the development of a real robotic system able to serve both purposes related to military and civil like live surveillance(both auto and manual), rescuing under natural disaster aftermath, firefighting, object picking, hazard like ignition, volatile gas detection, exploring underground mine or even terrestrial exploration. Each of the four other areas - hardware design, programming, controlling and artificial intelligence are also discussed.http://www.i-scholar.in/index.php/ENIABC/article/view/54734Temperature Dependent Thermal Properties in Single-Wall Carbon Nano Tubes Based on Phonon Scattering2014-10-21T11:26:06+00:00Alamgir KabirRumelia MurshedUmmul HusnaeenZahid Hasan MahmoodElectronic devices and integrated systems are reduced to the size of micron and nanometer level and it becomes particularly important to predict the thermal transport properties of the components. Because of a unique structure and novel properties of carbon nanotubes (CNTs) have attracted significant attention. In this article, thermal transport properties of single wall CNTs (SWCNTs) are introduced. Combining equilibrium and nonequilibrium molecular dynamics with carbon potentials, we have studied the thermal conductivity of carbon nanotubes and its dependence on temperature. Phonon conduction depends on band gaps as well as thermal contact resistance of metallic CNTs, governed by phonon scattering and it shows evidence of 1-D quantization of the phonon band structure. We have studied here the thermal conductivity of single wall nanotubes dependence on chirality structure, dimensions of tubes, defects and vacancies in tubes. We found that the single wall carbon nanotubes have very high thermal conductivity comparable to diamond crystal and in-plane graphite sheet.http://www.i-scholar.in/index.php/ENIABC/article/view/54735Electrical Characterization and Doping Uniformity Measurement during Crystalline Silicon Solar Cell Fabrication Using Hot Probe Method2014-10-21T11:26:07+00:00Nahid AkterAbul HossionMahbubul HoqSardar Masud RanaAnzanUz ZamanNasrul Haque MiaAlamgir KabirZahid Hasan MahmoodThe parameters of crystalline semiconductor such as types of semiconductor, uniformity of impurity concentration of doped wafer, majority charge carrier concentration, sheet resistivity of doped wafer surface play an important role in solar cell fabrication process during emitter diffusion, that is the most critical step. In this paper, we have used a low cost in house made hot probe measurement setup. A hot plate was used to heat up the wafer up to 100°C. Two k-type thermocouples were placed simultaneously in contact with the hot and cold surface of the wafer to measure the temperature in situ for both hot and cold probe. We have used two copper probes with a voltmeter connected to measure the potential difference (thermoelectric voltage) between two probes for various temperatures up to 100°C with an interval of 10°C. We have taken measurement for commercial silicon wafer (thickness 200 μm) and one side polished 4 inch diameter Si wafer (thickness 660 μm) to determine the wafer type (n-type or p-type). We also calculated thermopower or Seebeck coefficient from the voltage vs. time curve, that is constant for particular substrate. As a process monitoring tool for solar cell fabrication process, after n-type diffusion using POCl3 on p-type silicon wafer of thickness 200 μm, we have done wafer mapping that gives us the information of doping uniformity over the whole surface of wafer both front and back sidehttp://www.i-scholar.in/index.php/ENIABC/article/view/54736Study on MHD Boundary Layer Flow of Combined Heat and Mass Transfer over a Moving Inclined Plate in a Porous Medium with Suction and Viscous Dissipation in Presence of Hall Effect2014-10-21T11:26:07+00:00Mohammad AliMohammad Shah AlamThe Hall effects on the steady MHD boundary layer flow of an incompressible fluid of combined heat and mass transfer over a moving inclined plate in a porous media with suction and viscous dissipation has studied. An external magnetic field is applied perpendicular to the surface and the fluid motion is subjected to a uniform suction and injection. A closed form solutions of the equations governing the flow are obtained for the velocity, secondary velocity, and temperature and concentration profiles. The dimensionless governing equations are solved using RK method along with shooting technique. The velocities, temperature and concentration profiles are presented graphically for different values of governing flow parameters. The results presented graphically illustrate that primary velocity field decrease due to increase of magnetic parameter, angle of inclination, permeability parameter and suction parameter while secondary velocity also decrease for magnetic parameter, Hall parameter and permeability parameter .Other parameters increase the velocities of the fluid flow. Temperature field increases in the presence of Magnetic parameter, Grashof number, Modified Grashof number and permeability parameter and decreases for Prandlt number and suction parameter. Also, concentration profiles decreases for increasing the values of magnetic parameter, Hall parameter, Schmid number and suction parameter but there is no effect on concentration of the remaining parameters. Also the skin friction coefficient, the local Nusselt number and the local Sherwood number are presented in Tables 1-3.