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.

Illegal Trash Thrower Detection Based on HOGSVM for a Real-Time Monitoring System

Abstract: Some people are too ignorant of their surroundings. Most of them, usually, throw trash illegally in the streets or abandoned areas. In this paper, to get rid of such a problem, we have proposed a real-time monitoring mechanism to find the illegal trash throwing person for an intelligent surveillance system. The proposed mechanism of finding people and trash from the video frame can be done using subsequently applying the following several steps. At first, we have applied the shadow removal technique and then applied the background subtraction procedure. To reduce the noise levels, we have implemented labeling & filtering operations. For extracting feature vectors, a histogram of oriented gradients (HOG) is used. Finally, by applying a support vector machine classifier (SVM), we have identified both humans and trash from the video frames. The key contribution of this proposed framework is to gain better performance by applying the shadow removal technique before the background subtraction procedure. Besides, the temporary bounding box concept has been taken into consideration during the trash detection phase.

Potential of leaves of eighteen cultivars of Ficus carica as antioxidants and profiling of phenolic compounds as an active molecules

Abstract: Ficus carica is a worldwide important crop. Its different parts such as leaves, stem barks, fruit and roots are used in traditional medicine from ancient age to treat the various diseases. In this research, total phenolic content, antioxidant activity, yield of extract and profiling of phenolic compounds of maturated leaves of different cultivars of F. carica were investigated by using two different extraction processes: ultrasound-assisted extraction (UAE) and maceration. The total phenolic content (TPC) was calculated by using Folin-Ciocalteu assay, while DPPH and ABTS assays were used for analysed the antioxidant capacity. Additionally, liquid chromatography (LC) coupled to mass spectrometry (MS) was used to study the individual phenolic compounds present in leaves. Using DPPH assay, the percentages of inhibition and Trolox equivalent antioxidant capacity were found to vary from 66.19 ± 1.01 to 87.06 ± 0.93 % and 53.67 ± 0.81 to 70.25 ± 0.74 mg TE/g DL, respectively, for extracts obtained by maceration. In the case of ultrasonication extraction, these values ranged from 72.84 ± 1.26 to 92.04 ± 1.24 % and 60.73 ± 0.92 to 74.19 ± 0.99 mg TE/g dry leaves (DL). While ABTS assay the latter parameters were found to vary from 96.61 ± 0.22 to 99.33 ± 0.23 % and 56.81 ± 0.12 to 58.32 ± 0.13 mg TE/g DL for maceration, as well as from 97.82 ± 0.23 to 99.79 ± 0.13 % and 57.48 ± 0.13 to 58.57 ± 0.07 mg TE/g DL for ultrasonication extraction. The total phenolic contents varied between 10.70 ± 0.20 to 21.18 ± 0.68 mg GAE/g DL, and 12.94 ± 0.23 to 23.04 ± 0.30 mg GAE/g DL, respectively for the latter extraction processes. The percentages of yields varied from 7.20 ± 0.20% to 13.05 ± 0.23% and 8.25 ± 0.25% to 15.20 ± 0.20 %, respectively, for maceration and ultrasonication extraction. In conclusion, extracts from leaves of F. carica obtained by UAE process showed the highest antioxidant activity, phenolic contents and extraction yields as compared to maceration process. In comparison amongst the leaves, the ‘Violette solise’ cultivar showed the highest antioxidant activity and contain highest phenolic contents. Finally, the extract of this cultivar contained phenolic acids (dihydroxybenzoic acid di-pentoside, caffeic acid, caffeoylmalic acid, coumaroylmalic acid, ferulic acid malate, and psoralic acid glucoside), C-glycosides flavones, rutin and prenylgenistein.

Capacitance-Voltage characteristics of 2D material based XOI FET

Abstract: 2D material based XOI FET has been analyzed for Capacitance-Voltage(CV) characteristics where $MoS_{2}$ has been selected to represent 2D materials family. Schrodinger and Poisson equations have been solved self-consistently including device channel-oxide barrier penetration effects using Finite Difference Method. Material properties as well as physical dimensions of the device were varied to investigate these effects on the CV of the device. In this study, we observed that quantum capacitance becomes prominent when a thin channel has lower effective mass. Also, a stair-like behavior has been observed in the CV characteristics when a back gate voltage is applied. Channel thickness and back gate voltage control threshold voltage whereas effective mass and top oxide thickness control magnitude of the CV curve.

Sustainability Analysis of Net Zero Emission Smart Renewable Hybrid System Solution in Bangladesh Rural Context

Abstract: The paper is designed in two consecutive categories. The first part will include sociocultural effects and acceptability toward a new technology concept in a particular region of Bangladesh. The following part will describe the design of the optimized model with financially viable features which also include lifetime analysis, internal rate of return, payback time, annual savings analysis, risk analysis, etc. In conclusion, everything will be compared with local and national government policies that have already made up to analyze the future of this research. In Bangladesh, there is an ever-sustaining problem of electricity crisis in rural zones which is mainly due to imbalance in demand and supply of electricity from fossil fuel or natural gas-based power plants. In the paper, a different way is about to propose which will not only cover up the consumer demand with full potential but also sort out the ways to be beneficiary from selling of electricity to the local or national electric grid. Energy sources like biomass and solar are the most in use besides fossil fuel-based energy resources. Nowadays, thousands of biogas plants have been installed for supplying methane gas to use for the purpose of cooking in rural areas. However, these biogas plants can also be used for producing electricity by using one of the most efficient power-generating plants named combined heat and power (CHP). Luckily, Bangladesh has a lot of biogas resources which include animal manure, municipal solid wastes (MSW), food and crop wastes, and many more. These fuels can be processed for generating electricity for meeting the electricity demand in rural areas. Since the government of Bangladesh encourages utilizing renewable energy resources for producing electricity, many subsidies companies have been formed and acted in a full swing since past 10 years to reach the vision 2030 which will be 10% reduction in carbon emission to the nature. In this research, the overall analysis concludes that the proposed hybrid (bio-solar) model will be enough to cover up approximately 60–70% electricity demand by using biogas and about 20–30% by solar PV module to meet the electricity need of a village consists of 300 houses, 3 village markets, 4 schools/college/university, 2 local offices/NGOs, and the irrigation pumps of the village. However, life span for the biogas plant will be about 15–20 years. On the other hand, solar photovoltaic system can also run smoothly up to 20–25 years as a system. Future of this research will encourage energy utilization bonding among different social actors in rural areas of Bangladesh. Moreover, both self-sustaining local energy business and proper waste management could turn the society toward green revolution in a massive scale.