Energy Management through Bio-gas Based Electricity Generation System during Load Shedding in Rural Areas

The scarcity of energy especially electrical energy is an acute problem and hinders the modern economic development of a country. Most of the time only a small percentage of peoples have access to use continuous electricity supply. But in this modern era, all types of arena like economies, households and companies have extensive demand for electricity which is due to industrialization, extensive urbanization, population growth, rising standard of living and modernization of the agricultural sector of a country. Electricity generation from bio-gas plant through cowdungs of a dairy firm can mitigate the electricity demand to some extends in rural areas, where biogas plant will act act as a backup supply especially during load shedding. This research paper proposed an electricity generation system from bio-gas, which can work as a secondary source of the electricity for all electrical appliances of a particular area in a cost effective manner

DC fault identification in multiterminal HVDC systems based on reactor voltage gradient

With the increasing number of renewable generations, the prospects of long-distance bulk power transmission impels the expansion of point-to-point High Voltage Direct Current (HVDC) grid to an emerging Multi-terminal high-voltage Direct Current (MTDC) grid. The DC grid protection with faster selectivity enhances the operational continuity of the MTDC grid. Based on the reactor voltage gradient (RVG), this paper proposes a fast and reliable fault identification technique with precise discrimination of internal and external DC faults. Considering the voltage developed across the modular multilevel converter (MMC) reactor and DC terminal reactor, the RVG is formulated to characterise an internal and external DC fault. With a window of four RVG samples, the fault is detected and discriminated by the proposed main protection scheme amidst a period of five sampling intervals. Depending on the reactor current increment, a backup protection scheme is also proposed to enhance the protection reliability. The performance of the proposed scheme is validated in a four-terminal MTDC grid. The results under meaningful fault events show that the proposed scheme is capable to identify the DC fault within millisecond. Moreover, the evaluation of the protection sensitivity and robustness reveals that the proposed scheme is highly selective for a wide range of fault resistances and locations, higher sampling frequencies, and irrelevant transient events. Furthermore, the comparison results exhibit that the proposed RVG method improves the discrimination performance of the protection scheme and thereby, proves to be a better choice for future DC fault identification

Multi-objective optimal placement of distributed generations for dynamic loads

Large amount of active power losses and low voltage profile are the two major issues concerning the integration of distributed generations with existing power system networks. High R/X ratio and long distance of radial network further aggravates the issues. Optimal placement of distributed generators can address these issues significantly by alleviating active power losses and ameliorating voltage profile in a cost effective manner. In this research, multi-objective optimal placement problem is decomposed into minimization of total active power losses, maximization of bus voltage profile enhancement and minimization of total generation cost of a power system network for static and dynamic load characteristics. Optimum utilization factor for installed generators and available loads is scaled by the analysis of yearly load-demand curve of a network. The developed algorithm of N-bus system is implemented in IEEE-14 bus standard test system to demonstrate the efficacy of the proposed method in different loading conditions

Nutritional value of some small indigenous fish species (SIS) of Bangladesh

Twenty three small indigenous fish species (SIS) in the size range of 3-18 cm were analyzed for proximate composition and minerals (Ca and P) content to evaluate their nutritive value. The moisture content of different species ranged between 71.00 and 81.94%. In general, small sized fishes showed higher moisture content. The muscle protein content among the species varied widely (16.16-22.28%). In general, the muscle protein content of fishes showed higher value than the whole carcass protein content. The carcass lipid content varied between 1.87 and 9.55% and showed an inverse relationship with the moisture content. The gross energy content ranged from 19.51-27.30 KJ/g on dry matter basis. In the present study, the calcium and phosphorus contents ranged between 0.85-3.20% and 1.01-3.29% respectively. The calcium and phosphorus ratio (Ca/P) varied between 0.44 and 2.00. From the nutritional point of view, it shows that the SIS are good source of protein and minerals especially calcium and phosphoru

A green Economy in the Context of Sustainable Development and Poverty Eradication: What are the Implications for Bangladesh?

This paper justifies the necessitate for interpretive forms of economic study and then deals with their practical application in Bangladesh.               At present green economy is the burning issue in Bangladesh. To create awareness and provide information about green economics this is the main theme of this paper. Convincing evidence for policymakers and business leaders to supply in clean technologies, renewable energy and natural infrastructure will be presented in the Green Economy Report (GER), a ground-breaking study being conducted as part of the Green Economy Initiative. Sustainable development has been the overarching goal of the international community since the UN Conference on Environment and Development (UNCED) in 1992. Amongst numerous commitments, the Conference called upon governments to develop national strategies for sustainable development, incorporating policy measures outlined in the Rio Declaration and Agenda 21. Despite the efforts of many governments around the world to implement such strategies as well as international cooperation to support national governments, there are continuing concerns over global economic and environmental developments in many countries. These have been intensified by recent prolonged global energy, food and financial crises, and underscored by continued warnings from global scientists that society is in danger of transgressing a number of planetary boundaries or ecological limits.   Keywords: Green Economy, Sustainable development, Poverty Eradicatio

Evaluation of Public University Libraries Websites in Bangladesh: Feature: Contents, and Maintenance Issues

The research paves a way to look into the content, features, and upkeep of Bangladeshi public university library websites. To ensure representativeness, we selected twelve (12) public university libraries that have dedicated websites. For authenticity and reliability of data, a checklist of sixty-one (61) items divided into ten (10) categories was used, along with interview procedures. The findings of this research have been presented in both tabular and figurative forms. According to the research, the website trend, which began a few years ago, will become a driving force for library services, although there is still potential for development, such as liquid layout, mobile-friendliness, Web-OPAC, online tutorials, etc., and may indicate some maintenance issues for the library's website. This research is useful for information scientists and academic librarians involved in the establishment and management of library websites, particularly in underdeveloped nations like Bangladesh, where resources are restricted and studies are sparse

Current Practices of Green Marketing and Consumers’ Attitude towards Green Consumption: A Case Study of Some Selected Plastic-Bottled Soft Drinks Producing Firms

In today’s global economy, organizations are increasingly called upon to demonstrate sound management of economic, social and environmental issues. A focus on these issues results in advantages in financing, insurance, marketing, regulatory treatment, and other areas. Business today is not just about selling a product or service to a customer around the corner. In the rapid evolution to a global market-place, having a set of common rules is critical to facilitating trade. Increasingly in this single world market, an organization needs to be able to demonstrate sound business management that includes concern for the environment. This would obviously results in advantages in financing, insurance, marketing, regulatory, and other areas of operations. An Environmental Management System (EMS) provides a solid framework for meeting environmental challenges and realizing the benefits. EMS is a structured approach to addressing the environmental bottom line. Development and implementation of EMS requires careful concentration, otherwise it would be an overwhelming task. Major global firms and international industry associations have historically been leaders in the areas of corporate environmental performance and voluntary initiatives for global environmental management. On the other hand, Bangladeshi firms are seriously lagging behind. Multinational companies as well as larger associations must come forward to help their smaller counterparts in development and implementation of a successful EMS for the betterment of the business sector and the environment as a whole. Keywords: China insurance industry, Foreign fund, Challeng