Distributed Generation as Voltage Support for Single Wire Earth Return Systems

Key issues for distributed generation (DG) inclusion in a distribution system include operation, control, protection, harmonics, and transients. This paper analyzes two of the main issues: operation and control for DG installation. Inclusion of DG in distribution networks has the potential to adversely affect the control of voltage. Both DG and tap changers aim to improve voltage profile of the network, and hence they can interact causing unstable operation or increased losses. Simulations show that a fast responding DG with appropriate voltage references is capable of reduction of such problems in the network. A DG control model is developed based on voltage sensitivity of lines and evaluated on a single wire earth return (SWER) system. An investigation of voltage interaction between DG controllers is conducted and interaction-index is developed to predict the degree of interaction. From the simulation it is found that the best power factor for DG injection to achieve voltage correction becomes higher for high resistance lines. A drastic reduction in power losses can be achieved in SWER systems if DG is installed. Multiple DG can aid voltage profile of feeder and should provide higher reliability. Setting the voltage references of separate DGs can provide a graduated response to voltage correction

I) The synthesis of optically active thiols and related compounds ; and, 2) The oxidation of some thiocarbonates

Imperial Users onl

The Bangladeshi Consumer Behavior and Attitude Toward Superstores

Superstores introduced a whole new experience in the shopping of daily necessities. They offered quality products at a stable price in safe and clean environment in order to survive and achieve profitability. Although there are many factors which relate to customer satisfaction, but most of previous empirical research in this field tended to emphasize on quality products, products variety and special products, location, hygienic environment, hassle free shopping and freshness , competitive price, service and layout of the store. The purpose of the study is to identify the role of each of the factors to respond to customer requirements to satisfy customers and what and how they behave in the market place toward these factors. The totality of their movement toward the factors and attitude, the researcher liked to demonstrate here.  The questionnaires were developed from many previous researches. The data was collected from 50 customers of 5 superstores in Chittagong. The result of this study shows that the factors have positive relationship with customer satisfaction those in terms ensure store loyalty. Therefore, the superstores should consider product and store service factors as the foundation to satisfy customer and to improve service quality as an add-on value to customer. Keywords: Superstore, Consumer Behaviour, Attitude, Demographic factors

Distributed Generation Control using Protection Principles

In a distribution system, it is essential to maintain the voltage variation within a specified limit for satisfactory operation of connected customers' equipment. Normally, this goal is achieved by controlling the operation of compensating devices, such as load tap changing transformers, shunt capacitors, series capacitors, shunt reactors, and static VAr compensators. However, technical and regulatory developments are encouraging a greater number of small generator units, known as Distributed Generation (DG), and this has the potential to significantly affect voltage control systems. This paper presents an adaptive voltage control technique which incorporates DG systems into the voltage control system. The control scheme uses On-load Tap Changing Transformer (OLTC) and DG for voltage corrections, both are driven by advanced Line Drop Compensators (LDC). At the substation, the LDC is employed to control step up or step down decisions of the OLTC, while another LDC will be used at DG connection point to set DG parameters. Also, for a more cost-effective system, voltage control action coordination is proposed using magnitude grading and time grading. The control approach is tested on a modified distribution system with load variations that are stochastic in time and location. The results show that the integration of these magnitude grading and time grading, protection principles have considerably reduced the DG energy required to achieve the desired control

Customer Satisfaction of Super Stores in Bangladesh- An Explorative Study

The numbers of Super stores are increasing in Bangladesh to satisfy the demand of customers. The present study has been undertaken in order to identify the influencing factors of customer satisfaction by employing sophisticated multivariate technique- Varimax Rotated Factor Analytical Technique. The study has collected and used only primary data and consulted available literature for designing the questionnaire. The study has identified factors influencing the customer satisfaction of superstores in Bangladesh: Product factors, Store service factor, and Customer facilities factor. The study has suggested entrepreneurs of Super stores to consider these factors while designing their policies for superstores. Keywords: Superstore, Customer Satisfaction, Factor Analysis, Product Factors

Eco-Banking Strategies for Competitive Advantages

Environment issues compel the financial institution especially banking business to conduct in such areas in such a manner that helps the overall reduction of external carbon emission and internal carbon footprint. Based on these ideologies, the study initialized the greening strategies for eco-banking and formed a theoretical model through extensive literature survey. These strategies incorporate into three content -green indoor, green process and green outdoor based on potentialities where the factors within the green functions focused low cost and differentiation to ensure competitive advantage. Hence the progress of banks under the crown of eco-banking will obviously create a future milestone in dynamic banking. Keywords: Eco-banking, competitive advantage, green banking, sustainable strategies

Improvement opportunity in Agile Methodology and a survey on the adoption rate of the Improved Methodology

Agile method promotes an iterative process on software development. It is a lightweight process that employs short iterative cycles, actively involve users and developers to establish, prioritize, and verify requirements and rely on a team’s tacit knowledge as opposed to documentation. In this paper we describe the existing agile methodologies and improve its different parameters so that software development industries can adopt it more easily. It describes the improvement of overall understanding of the constituent parts of agile systems development methodologies and some improvement of different parameters. In our proposed method we design a Tool of adoption matrix which will help software development industries for adoption decision solution of the Improved Agile Methodology. We have described the result of different software workshop where the adoption assessment will be used to assess the existing agile system and the improved agile system. The result from this tool will help software industries to apply the improved agile methodologies. Keywords: Agile Methodology, Adoption decision, Adoption assess tool, Improvement of Agile

An Enhanced Pairwise Search Approach for Generating Optimum Number of Test Data and Reduce Execution Time

In recent days testing considers the most important task for building software that is free from error. Since the resources and time is limited to produce software, hence, it is not possible of performing exhaustive tests (i.e. to test all possible combinations of input data.) An alternative to get ride from this type exhaustive numbers and as well to reduce cost, an approach called Pairwise (2 way) test data generation approach will be effective. Most of the software faults in pairwise approach caused by unusual combination of input data.  Hence, the demand for the optimization of number of generated test-cases and reducing the execution time is growing in software industries. This paper proposes an enhancement in pairwise search approach which generates optimum number of input values for testing purposes.  In this approach it searches the most coverable pairs by pairing parameters and adopts one-test-at-a-time strategy for constructing a final test-suite.  Compared to other existing strategies, Our proposed approach is effective in terms of number of generated test cases and of execution time. Keywords:, Software testing, Pairwise testing, Combinatorial interaction testing, Test case generation

An internet of things framework for real-time aquatic environment monitoring using an Arduino and sensors

Aquaculture is the farming of aquatic organisms in natural, controlled marine and freshwater environments. The real-time monitoring of aquatic environmental parameters is very important in fish farming. Internet of things (IoT) can play a vital role in the real-time monitoring. This paper presents an IoT framework for the efficient monitoring and effective control of different aquatic environmental parameters related to the water. The proposed system is implemented as an embedded system using sensors and an Arduino. Different sensors including pH, temperature, and turbidity, ultrasonic are placed in cultivating pond water and each of them is connected to a common microcontroller board built on an Arduino Uno. The sensors read the data from the water and store it as a comma-separated values (CSV) file in an IoT cloud named ThingSpeak through the Arduino microcontroller. To validate the experiment, we collected data from 5 ponds of various sizes and environments. After experimental evaluation, it was observed among 5 ponds, only three ponds were perfect for fish farming, where these 3 ponds only satisfied the standard reference values of pH (6.5-8.5), temperature (16-24 °C), turbidity (below 10 ntu), conductivity (970-1825 μS/cm), and depth (1-4) meter. At the end of this paper, a complete hardware implementation of this proposed IoT framework for a real-time aquatic environment monitoring system is presented

Improving Australia's trade balance: A case study of agro-forest and fish products

The impact of the exchange rate (ER) on the trade balance (TB) has been discussed for many years. However, the issue has not been discussed in sufficient depth, especially in relation to the TB of agricultural products. This paper will gauge this impact on Australia, which has much potential for agro-based trade in the world market. We have applied the Bahmani-Oskooee and Hosny's approach of the linear autoregressive distributed lag model to estimate the Marshall–Lerner condition (MLC) regarding the trade of Australian agro-forest and fish (AFF) products with its five major partner countries. Quarterly data will be used for the period 1988Q1–2020Q4. Our findings support the MLC in case of the major share of Australian AFF trade. The implication is that if the market force depreciates Australian ER, the country's AFF TB will improve in the long-run