International Islamic University, Chittagong

About: International Islamic University, Chittagong is a education organization based out in Chittagong, Bangladesh. It is known for research contribution in the topics: Debye model & Density functional theory. The organization has 1111 authors who have published 1089 publications receiving 7918 citations. The organization is also known as: IIUC.

Electricity Generation from Train Wheel Axle

Abstract: The real threat to life on earth is pollution. According to google the top 10 reason of death is cardiovascular disease, cancer, diabetes mellitus, injury, stroke, chronic condition, accident, Alzheimer's disease, pneumonia, and respiratory diseases. Most of those are directly or partially connected with environmental pollution and the main reasons for the environmental pollution are the increase of CO 2 or other gasses. The most significant reason for the increase of different gas into the environment is burning fuel. If we are able to reduce the amount of fuel burning then gas production rate will decrees. Bangladesh railway use power core power generation system for generating electricity for train compartments internal power requirement (compartments light, fan etc.). In this system, the fuel generator is used for power generation. Enormous fuel burning makes environment pollution. To this research, we try to develop an eco-friendly electricity generation system from the train wheel axle which can able to reduce some amount of fuel burning. We use here fuel generator and also build an alternator that rotor makes by train wheel axle. When train run then axle are rotating then we get rotating magnetic field and after rotor getting the certain speed we collect electricity from that source. Here, we make an auto controlling system for control voltage fluctuation and switching between two systems.

Solar PV Integrated Distributed Generation System Protection with Bridge Current Limiter Controller

Abstract: Distributed generation (DG) systems are endangered to fault because of the rise of fault current level in power system. Further incorporation of DG by power electronic converters are increasing this danger even more day by day. The inverter based distributed generation (IBDG) system is used to work with a solar photovoltaic (PV). This paper proposes a bridge type fault current limiter (BFCL) based control scheme so that the IBDG system can be kept secure. The BFCL is connected after the VSC of the PV system and the system controller controls the impedance of BFCL. As an input to the BFCL activation controller, direct axis and quadrature axis voltage and current at the common coupling point (PCC) are used. To locate the fault in the device and enable the BFCL process, the deviation of current and voltage at the PCC is used. To demonstrate the effectiveness of the suggeseted controller, 3 line to ground (3LG) and 2 line to ground (2LG) faults are applied in grid with which the PV system is connected. With the suggested BFCL based controller, a major mitigation in the fault current magnitude is examined. The fault current mitigation performances have also been contrasted with the conventional series dynamic braking resistor (SDBR) control strategy and it has been demonstrated that the proposed BFCL controller is superior than SDBR.

Efficiency enhancement of solar cell: Fusion of texturisation and back contact Emitter-Wrap-Through modeling

Abstract: Solar cell has an enormous developing capacity as kind of green renewable energy source. Nevertheless, accompanied by some losses such as light reflection loss, recombination loss, grid shadowing loss, and low carrier concentration, the energy conversion efficiency of a solar cell remains unsatisfactory. A lot of research work has been done and yet been continued in order to enhance the solar cell efficiency. Among them, surface texturisation is quite enough succeeded in reduction of reflectance through light trapping in the cell and thence higher light absorption. Again, Emitter-Wrap-Through back contact cell technology paves the way to reduce grid loss as well as double-sided carrier collection and therefore increases short circuit current. However, at present, Texturization and Emitter-Wrap-Through (EWT) technology are used individually. In this paper we promote a possible solar cell design by combining these two features along with a PC1D software simulation to enhance the efficiency of solar cell.

An approach to design an improved PQHA that resonates both GPS L and L1 band

Abstract: For Global navigation satellite systems (GNSS), broadcasting satellite systems or other Navigation systems, the receiver terminal antenna has to have certain important properties. The Printed Quadrifilar Helix antenna (PQHA) is a very good selection for the above mentioned applications as the PQHA is capable of providing very good axial ratio, circular polarization, broadband property, easy to manufacture, light weight and cost effective. The conventional PQHA has broadband property but in some cases it does not resonate with the exact or particular frequency band we do need to. Despite of having such increased broadband properties, these PQHA cannot be compatible with some of the GNSS frequency bands. In this paper a new PQHA design has been proposed, with changing the length and pitch angle slightly from the conventional one. This new PQHA has a very good gain, circular polarization and radiation pattern with dual band property that resonates with both GPS L and L1 frequency band. It is also resonating in the exact frequency band same of GPS. Computer Simulation software CST has been used throughout the designing and simulation process which generates excellent results. The experimental results and a prototype of such PQHA are presented to validate the concept.