M.M. Rahman, Sourav Saha, Satyajit Mojumder, Khan Md. Rabbi, Hasnah Hasan and Talaat A. Ibrahim
The purpose of this investigation is to determine the nature of the flow field, temperature distribution and heat and mass transfer in a triangular solar collector enclosure with…
Abstract
Purpose
The purpose of this investigation is to determine the nature of the flow field, temperature distribution and heat and mass transfer in a triangular solar collector enclosure with a corrugated bottom wall in the unsteady condition numerically.
Design/methodology/approach
Non-linear governing partial differential equations (i.e. mass, momentum, energy and concentration equations) are transformed into a system of integral equations by applying the Galerkin weighted residual method. The integration involved in each of these terms is performed using Gauss’ quadrature method. The resulting non-linear algebraic equations are modified by the imposition of boundary conditions. Finally, Newton’s method is used to modify non-linear equations into the linear algebraic equations.
Findings
Both the buoyancy ratio and thermal Rayleigh number play an important role in controlling the mode of heat transfer and mass transfer.
Originality/value
Calculations are performed for various thermal Rayleigh numbers, buoyancy ratios and time periods. For each specific condition, streamline contours, isotherm contours and iso-concentration contours are obtained, and the variation in the overall Nusselt and Sherwood numbers is identified for different parameter combinations.
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Keywords
Tamanna Yesmine, Md. Emran Hossain, Md. Akhtaruzzaman Khan, Sandip Mitra, Sourav Mohan Saha and Md. Ruhul Amin
The economic development of Bangladesh is heavily reliant on the banking industry, yet it faces numerous hurdles, including liquidity issues, capital shortages, non-performing…
Abstract
Purpose
The economic development of Bangladesh is heavily reliant on the banking industry, yet it faces numerous hurdles, including liquidity issues, capital shortages, non-performing loans, inefficiencies and so on. Therefore, this study investigated the performance and efficiency of scheduled banks (state-owned, private commercial, foreign commercial and specialized banks) operating in Bangladesh.
Design/methodology/approach
The research was conducted using secondary data from annual reports of banks. The CAMELS rating system and Data Envelopment Analysis (DEA) methods were employed to measure the performance and efficiency of banks, respectively.
Findings
In the overall bank rankings, results revealed that foreign commercial Standard Chartered Bank and state-owned Sonali Bank Limited came in first and last position, respectively. Among the four categories of banks, foreign commercial banks were the best performer, while state-owned banks were the worst. Only two banks, i.e. Citibank NA and HSBC Bank, were scale efficient while the remaining banks were inefficient. In terms of performance and efficiency, state-owned and specialized banks were deemed wanting.
Practical implications
This study proposes recommendations to the policymakers that could lead to more effective tactics for improving the banking industry's performance and efficiency.
Originality/value
As far as the authors are concerned, this study presents empirical evidence on the performance and efficiency of different types of banks and explores comparisons among them, which has never been done to this extent in the country before.
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Md Sakib Ullah Sourav, Huidong Wang, Mohammad Raziuddin Chowdhury and Rejwan Bin Sulaiman
One of the most neglected sources of energy loss is streetlights that generate too much light in areas where it is not required. Energy waste has enormous economic and…
Abstract
One of the most neglected sources of energy loss is streetlights that generate too much light in areas where it is not required. Energy waste has enormous economic and environmental effects. In addition, due to the conventional manual nature of operation, streetlights are frequently seen being turned ‘ON’ during the day and ‘OFF’ in the evening, which is regrettable even in the twenty-first century. These issues require automated streetlight control in order to be resolved. This study aims to develop a novel streetlight controlling method by combining a smart transport monitoring system powered by computer vision technology with a closed circuit television (CCTV) camera that allows the light-emitting diode (LED) streetlight to automatically light up with the appropriate brightness by detecting the presence of pedestrians or vehicles and dimming the streetlight in their absence using semantic image segmentation from the CCTV video streaming. Consequently, our model distinguishes daylight and nighttime, which made it feasible to automate the process of turning the streetlight ‘ON’ and ‘OFF’ to save energy consumption costs. According to the aforementioned approach, geo-location sensor data could be utilised to make more informed streetlight management decisions. To complete the tasks, we consider training the U-net model with ResNet-34 as its backbone. Validity of the models is guaranteed with the use of assessment matrices. The suggested concept is straightforward, economical, energy-efficient, long-lasting and more resilient than conventional alternatives.
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Sunny Vijay Arora, Malay Krishna and Vidyut Lata Dhir
This case can be used to teach students how to analyze innovative business models, as well as to trace their reasons for success and failure. The following objectives also align…
Abstract
Learning outcomes
This case can be used to teach students how to analyze innovative business models, as well as to trace their reasons for success and failure. The following objectives also align with categories in Bloom’s taxonomy (Forehand, 2010), consistent with the keywords underlined. More specifically, this case will enable students to learn the following: First, to analyze the distinctive features of a social commerce business model, and how these differ from a traditional e-commerce model. This objective maps to Discussion Question No. 1. This objective helps students to understand the value proposition of an unfamiliar business model (social commerce platform) and compare it with that of a familiar business model (e-commerce platform). Second, racing the causes for success and failure of a venture, using frameworks from entrepreneurship and strategy. This relates to Discussion Question No. 2. This objective helps students analyze strategic decisions of an entrepreneur in light of available resource constraints and by applying appropriate conceptual frameworks. Third, developing recommendations to help a new venture sustain its business model in the face of severe challenges. Discussion Question No. 3 covers this objective. This objective enables students to debate possible paths that the startup could take. The discussion on possible paths naturally causes students to create sustainable or viable options.
Case overview/synopsis
The case describes the challenge facing Vidit Aatrey, the founder and chief executive of Meesho, a social commerce venture headquartered in Bangalore, India, in October of 2022. While Meesho recorded the second-highest sales (by order volume) during India’s festive season, it also recorded layoffs and business closures. While Meesho’s core business of getting resellers to sell through its online platform seemed to be working, its new business ventures, such as expanding into the grocery business and into Indonesia, had failed and resulted in more than 300 layoffs. Meesho was also pressed for funding: valued at US$4.9bn, the global market for venture capital funding had chilled and now demanded profitability, not growth-at-all-costs. Meesho’s cash burn rate was about $40m per month, and Aatrey was hard pressed to come up with options for profitable growth.
Complexity academic level
This case is intended for students of management at a master’s level in a course on entrepreneurship. At the authors’ institute, this case is used with MBA students in an elective course on entrepreneurship and also in an elective course in general management.
Supplementary materials
Teaching notes are available for educators only.
Subject code
CCS 3: Entrepreneurship
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Keywords
Md. Saidur Rahaman, Syed Muhammod Ali Reza, Md. Mizanur Rahman and Md. Solaiman Chowdhury
Throughout history, tea garden workers are treated as slaves of employers and live an inhuman life in modern society. This paper aims to provide an account of the deplorable…
Abstract
Purpose
Throughout history, tea garden workers are treated as slaves of employers and live an inhuman life in modern society. This paper aims to provide an account of the deplorable community (workers) of the tea garden in Bangladesh.
Design/methodology/approach
The authors used a mixed-method research approach to conduct this study. In the first stage, using a semi-structured questionnaire, Focus group discussions (FGDs) were done by forming two groups from two districts to get a clear picture of the tea garden workers’ living standards in Bangladesh. Based on the findings of the FGD, the researchers prepared a structured questionnaire containing the basic elements of their quality of work life. In this stage, the authors collected the information from 200 tea workers about their quality of work life.
Findings
The major finding showed that the overall country’s economy is booming because of tea workers’ contributions, but their economic conditions gradually become impoverished. The workers’ are living with colossal poverty and vulnerability. Besides, the workers are supposed to get fundamental rights, including food, clothing, shelter, education and health, but the higher authorities were found indifferent to take the necessary initiative to implement these rights.
Research limitations/implications
The data was collected only from the tea garden workers. This study excluded any other parties (trade union leaders, panchayats, garden managers and owners). Thus, it is suggested that the researchers should conduct a similar study covering the opinion, including all the parties.
Practical implications
Both the workers and the higher authorities of the tea garden might benefit from this study’s findings. Workers will be more aware of their basic rights. The authorities can also prepare some effective policies to improve the overall quality of life of the tea workers.
Originality/value
To the best knowledge of the authors, this is the first study on tea garden workers’ inhuman life in Bangladesh in the entire emerald insight publishers.