Chittagong University of Engineering & Technology

About: Chittagong University of Engineering & Technology is a education organization based out in Chittagong, Bangladesh. It is known for research contribution in the topics: Renewable energy & Dielectric. The organization has 1200 authors who have published 1444 publications receiving 10418 citations. The organization is also known as: Engineering College, Chittagong & Bangladesh Institute of Technology, Chittagong.

Hybrid energy optimization: An ultimate solution to the power crisis of St. Martin Island, Bangladesh

Abstract: Modern era is looking at the sustainable energy for a permanent solution to the future power demand all over the world whereas the countries of the third world like Bangladesh is still failure to meet the present basic power demand. St.Martin Island is one of those places which are still out of national grid in Bangladesh. It is the most beautiful tourist island in the Bay of Bengal, which is in the most southern part and 17 km far away from the main land of Bangladesh. Grid connected electric system is quite impossible even in future because of costs and geographic location. Present electricity demand is partially fulfilled by stand-alone diesel generators only for four hours per day with large amount of CO2 emission. This paper is documented to give a solution of the power crisis of St.Martin Island with optimizing hybrid power generation scheme concentrating on sustainable energy. Using HOMER analysis, an optimum configuration is established among a set of systems to supply electricity to about 1400 families, 150 shops, 100 hotels and various organizations. The load calculation for the whole island has an outcome of a demand of energy about 4000kWh per day with a peak load of 504kW. This system incorporates a combination of 600kW decentralized Solar PV, 3 wind turbines of 1.8kW each, 2000 batteries of 800Ah each, 300kW biogas generator and 15kW diesel generator to fulfill the whole power demand of St.Martin Island. This configuration gives lowest cost of energy (COE) as BDT 15.04/ kWh (US$ 0.2/kWh) with a renewable fraction of 99.3%. It reduces CO2 emission significantly. This hybrid system may be an effective solution to the present electricity demand of St.Martin Island without hampering the environment. Besides, it may be an ideal example of a renewable hub because of its high renewable fraction. Keywords— Hybrid system, Off-grid, Solar, Wind, Biomass, high Renewable fraction, Less CO2 emission.

IoT Based Smart Helmet and Accident Identification System

Abstract: A motorcycle frequently called motorbike or two-wheelers, which is the most used than another form of automobiles because of its low price. But another side, this is the most unsafe automobile. The accident can happen for driving fast or drunk driving. Safety and security in vehicle traveling are a pre-eminent concern for all. With the rapid urbanization and staggering growth of transport networks like two-wheeler vehicles, safety on the roads and security on the bike has emerged as an inescapable priority for us. It has expanded the rate of accidents, which leads to several damages with loss of lives. In many circumstances, we cannot able to detect the accident's location. A helmet is a form of protecting gear worn to keep safe the head from injuries. More specifically, the helmet aids the skull in protecting the brain. A smart helmet can detect the accident's locations also save lives and makes two-wheeler driving safer from previously. This paper propounds a smart helmet system to avoid the accident. The system divides into three parts helmet circuit, automobile circuit, and mobile application. At first, the helmet circuit has IR and alcohol detection sensor. The automobile circuit has a 3-axis accelerometer, Bluetooth module, relay, and load sensor. The helmet circuit sends a signal to the automobile circuit to start if the helmet is wearied and no alcohol detects. Then the automobile circuit checks the status of the load to start. 3-axis accelerometer senses crash or hit. After detecting an accident mobile application sends the accident location automatically to police and emergency contact number via the database.

Structural, morphological and magnetic properties of Al 3+ substituted Ni 0.25 Cu 0.20 Zn 0.55 Al x Fe 2-x O 4 ferrites synthesized by solid state reaction route

Abstract: Ni-Cu-Zn ferrite materials have been extensively used in electronic materials because of their outstanding properties at high frequencies. This work investigates the impact of Al substitution on the structure, morphology and magnetic properties of Ni0.25Cu0.20Zn0.55AlxFe2−xO4 (x = 0.00, 0.05, 0.10, 0.15 and 0.20) prepared by solid state reaction method. X-ray diffractometer (XRD), field emission scanning electron microscope (FESEM), impedance analyzer and Vibrating Sample Magnetometer (VSM) were used to characterize the properties of the samples. The XRD study confirmed the cubic spinel structure with single phase for all the samples. The lattice constant, X-ray density and bulk density decrease while the porosity and grain size increase with the increase of Al content in the samples. The frequency dependence of the complex permeability sintered at 1200 °C has been measured for toroidal samples in the frequency range between 1 kHz and 120 MHz at room temperature. The decrease in initial permeability has been explained on the basis of variation in grain size. The temperature dependence of the initial permeability has been measured in the temperature range between from 30 to 250 °C. Curie temperature (Tc) has been estimated from the temperature dependence of the permeability spectra for all samples. It is found that Curie temperatures and initial permeability ( μ i ′ ) decrease on Al substitution. The saturation magnetization has been measured at room temperature and it was found to decrease with increasing of Al3+ ions.

Ion acoustic shock and periodic waves through Burgers equation in weakly and highly relativistic plasmas with nonextensivity

Abstract: A comparative study is carried out for the nonlinear propagation of ion acoustic shock waves both for the weakly and highly relativistic plasmas consisting of relativistic ions and q-distributed electrons and positions. The Burgers equation is derived to reveal the physical phenomena using the well known reductive perturbation technique. The integration of the Burgers equation is performed by the method. The effects of positron concentration, ion–electron temperature ratio, electron–positron temperature ratio, ion viscosity coefficient, relativistic streaming factor and the strength of the electron and positron nonextensivity on the nonlinear propagation of ion acoustic shock and periodic waves are presented graphically and the relevant physical explanations are provided.