Volume 13, Issue 3, March 2022 Edition - IJSER Journal Publication


Publication for Volume 13, Issue 3, March 2022 Edition - IJSER Journal Publication

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THE ISSUES WITH ONLINE CLASSES FROM THE POINT OF VIEW OF UNDERGRADUATE STUDENTS IN BANGLADESH []


Covid-19 has had a devastating effect on the academic study curriculum because educational institutions have not been able to hold face-to-face classes and have been forced to start classes online. This is an investigative study that sheds light on the issues that Bangladeshi undergraduates did not attend, were left behind, or were not interested in participating in their online classes before the end of the class. A total of 100 undergraduate students from different universities of Bangladesh located in Dhaka city were selected following the convenient sample model. Based on their opinions, the study found that lack of necessary devices, internet connection and lack of power made their classes unnecessary for most of the reasons. It was also found that universities reduced their class time, but increased the stress of lectures, homework and exams which created stress because students had very few opportunities for counselling and they could not even go outside to refresh their minds as the lockdown continued. Students also had problems using online applications because most of them were using the applications for the first time, as a result, it was difficult for them to be present when logging in, opening webcams and submitting assignments and exam answers. Although educational institutions have recently resumed face-to-face classes, they should also prepare a compact package to alleviate students' problems so that institutions can provide a better online experience for students if such uncertainty arises again in the future.

Case Study of a Hybrid Geothermal-Solar System []


The usage and management of renewable energy have become a topic of interest since existing literature suggests that it would replace fossil fuels. In this study, an analysis of a closed-loop hybrid geothermal-solar energy system is introduced to control air temperature. This can be used in different air-conditioning applications including greenhouses, living quarters, and buildings. Such a case study was carried out in Damanhur city, Beheira Governorate, Egypt. First, the air produced from the proposed hybrid system conditioned the air of a room with the dimensions of L 2m x W 2m x H 2m. Geothermal energy was used to transfer heat to/from an air stream flowing inside a 5 m long, 2 inches in diameter, and 5.3 mm thickness PVC pipe. The pipe was buried 2 m below the ground’s surface and was supported by a solar chimney during the winter for the natural draft of air stream. In addition, a numerical model was built with 9 closed-loop geothermal cases of different design conditions. The pipe’s diameter varied in different cases from 0.17, 0.35, and 0.65 m, while the total pipe length was 47, 64, and 87 m. After that, the air stream was supplied to a room with the dimensions of L 3m x W 3m x H 3m. The air was subject to a 1m long solar chimney at 45ᵒ angle on a horizontal plane. The results of the numerical model prove that the maximum room temperature difference, which is close to 5 ᵒC, can be achieved using a pipe with a diameter of 0.65 m, and a length of 87 m. The validation of the numerical model was carried out using experimental results.

IOT BASED MEDICAL INFORMATION MANAGEMENT SYSTEM []


Abstract—Successively development of Internet of Things (IoT) technology made data passing easier through the internet. It has opened new possibilities for the medical sector for information passing. But there are many scopes yet to explore. Therefore, research on IoT based medical systems received substantial attention from the research community over the last decade. But the major problem remains transferring patient’s data from one hospital to another via internet. This paper introduces a new approach based on the Internet of Things in medical environments to enhance the security and efficiency of the internal communication by implementing asymmetric cryptography for data exchange among hospitals. Here one user can transfer his/her medical data using his/her own private key. Subsequently implementing this system patients don't need to carry a hard copy of medical records in case of transferring hospital. Medical data can be obtained electronically from one hospital to another.

Contact-less temperature and heart rate measuring system for medical applications []


This paper describes the development of a contact-less temperature and heart rate measuring system. In recent years, much attention is being paid to research and development of technology that provides contact-less measurement of vital signs for example heart rate, body temperature and respiration, which are important for understanding the state of a person’s health. The paper consists of sensors which measures heart rate and body temperature of a patients which is controlled by Arduino. Both the readings are displayed in the LCD display or monitor. The pulse sensor counts the heart beat for specific interval of time and the temperature sensor measures the body temperature. Eventually, this project provides a low cost, easily accessible human health monitor solution bringing the gap between the patients and doctors during this corona virus pandemic. There, are a few devices in the current market which can give crude clinical estimation information to patients and specialists, yet the patients may not decipher the clinical estimation into significant conclusion since they have minimal clinical foundation or knowledge. Then again, if raw clinical information is conveyed to the specialist, it kills a lot of time and may create additional problems, yet in crises time can never be squandered.

An assessment of groundwater quality of shallow tube wells using physio-chemical parameters at three villages of Kalpitiya peninsula of Sri Lanka []


Coastal sand aquifer is the sole freshwater resource available in the Kalpitiya peninsula of Sri Lanka, where coconut plantation was prominent till 1970. Since then, intensive agricultural practices have been carried out using synthetic chemicals. This assessment aims to quantity the groundwater quality (n=33) of selected three villages where agriculture is the prominent activity by using shallow tube-wells for irrigation, in comparison with two prominent seasons, namely rainy and drought in 2020. Samples were collected using standard methods and tested through the accredited laboratory. The overall result reveals that there is no significant groundwater quality deviation with respect to the drought and rainy season of 2020; however, a third shallow tube-wells (n=11) WQI was above 50, which means poor to very poor groundwater quality, those wells are not suitable for direct human consumption. In contrast, a two-third tube-well WQI was below 50 means good groundwater quality with respect to the assessed physio-chemical parameters, which means the groundwater quality of respective shallow wells are not being affected by external pollutants.

Intersectional Feminism in Game of Thrones []


There is a two-way relationship between intersectional feminism and pop culture. While feminists have time and again appreciated as well as critiqued representation of feminism as well as women in pop culture, pop culture too have responded to feminism in layered and complicated ways. Contemporary feminism is an integral part of pop culture, be it in the Marvel movies, or popular web series like Orange is the New Black, Game of Thrones etc. It is important to recognize the feminist characters and the underlying feminist perspectives across popular culture. This essay explores the aspect of intersectional feminism in the show, Game of Thrones and analyses as to what extent the show has succeeded in being inclusive empathetic when it comes to the women characters and their struggles. Keywords: Intersectional feminism, Game of Thrones, pop culture, feminism, gender, and identity

Evaluation of Distribution injection substation using Faults-Tree Techniques in a Developing Economy []


Electricity supply involves complex and highly integrated system (generation, transmission and distribution etc). Failure in any part can cause interruptions (black out) which ranges from inconveniencing large number of local residents which may leads to total outage as a concern for poor power supply. Essentially, electricity power reliability and supply has been an important and most driving issue for consumer economic activities as a requirement from electricity supply utilities, this will necessitate and enhance reliable and efficient electric power supply for daily operations. This research work present a reliability assessment techniques (means time before failure/MTBF, meantime to repair (MTTR), system average interruption frequency index (SAIFI), system average interruptions duration index (SAIDI) etc). In order to assess the activities of four (4) outgoing distribution feeders of 11k- station-road,11kv Amadi –North feeder, 11kv - Flour-mill and 11kv Borokiri distribution feeder using the application of electricity transient analyzer tool Etap version 12.6 for modeling, simulation (specialized software). The analysis was carried out using 2019 and 2020 historical data set the zone under investigation in the study. The study considered load point 1-4 respectively for the four (4) outgoing feeder. Load point analysis shows the results of MTBF and MTTR as 11.07hrs, 55.5hrs for station-road feeder, similarly flour-mill feeder captured 14.3hrs, 10.29hrs for MTBF and MTTR respectively, while Borokiri 11kv feeder shows MTBF and MTTR with 10.71hrs, 5.47hrs. In the same manner the Amadi-North shows 19.91hrs and 10.29hrs in the year under this research study. The maintenance metrics which measures the average time for non-repairable asses before system failing to engage in productive services in a year before repair in other words the average life span of the load-point feeder before failure and repair are systematic ranked as load point 2 (Amadi-north which about twenty hours engagement, followed by load pon3 (flour-mill feeder), load-point 1 (Station-roadfeeder) and load point 4 (Borikiri feeder). Consequently, the mean time to repair (MTTR), is the average time to repair and restore a failed system for the loads points 1-4 which are: MTTR (5.58hrs, 10.27hrs, 10.29hrs and 5.47hrs respectively. This indicate that load point – 4 (Borokiri feeders) which shows less average time to repair and restore the failed systems followed by load point-1(station road), load-point 2 (Amadi north) and load-points 3 (Borokiri) in that manner. This also considered the fault-tree analysis (Boolean algebra) for system component analysis and reliability. Having considered the activities of the four(4) – outgoing feeder from marine-base injection substations taking electric power supply from Nzimiro (Transmission substation, Ts) which operations are configured radically and aimed at minimizing the cost of active and reactive power losses on the view to improve system security for power quality and voltage profile to the zone under study. Evidently, this research work has proposed an automatic sectionalizing devices (line reclosers, interrupters, fuses controllers etc) in order to reduce the losses to the affected customers load points, thereby enhancing efficient power supply and reliability to consumers in order to make a savings.

Assessment of Damping Effect as Applicable to Automobile Shock Absorber systems and related damper Systems. []


This study seeks to review the theories behind the effect of damping in harmonic oscillator and suggest improvement in its application in an automobile shock absorber system as well as other related damper systems. An experiment was conducted to investigate damping effect in three media (air, water and 50w engine oil). The results were presented in tables and graphs to analyze and compare the rate at which the amplitude decaying with time in media investigated which invariably used to validate field measurements. A critical damping was found in 50w engine oil and it is suggested to be excellent to automobile engineers in order to improve the passenger’s comfortability in an automobile system. The critical damping was found would give more comfortability and healthier due to its rapid decay in vibration coming to passenger seat. Consequently, it provides an alternative support to the automobile shock absorber system in the passenger seat constructions to reduce the vibrational impact in human body and the design of the vehicle body (chassis) together with engine components

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