VOLUME 2 ISSUE 1
A COMBINED STRENGTH AND COST ANALYSIS OF CONCRETE BY USING FOUR DIFFERENT MATRIXES OF MATERIALS
Authors: Md. Tanvir Ehsan Amin, Md. Abdul Basit, Md. Monirul Islam
Published: 2019-December-15
Among all construction materials, concrete remains the only choice for most structures, and after water, it is the most widely used substance throughout the world. This article represents the research on four different combinations of concrete mixtures prepared with partially replaced fine aggregate as glass powder and iron powder, partially replaced coarse aggregate using demolished concrete, and uses of GI wire fiber as additional materials with various diameters. The primary investigation was conducted based on the concrete compressive strength with various percentages and sizes of materials. From the experiment, it is found that using glass powder and iron powder as partially replaced fine aggregate has shown an 18% and a 24% increase in compressive strength respectively up to a certain percentage. For demolished concrete, although the strength decreases by percentage, the use of GI wire fiber as additional materials shows remarkable enhancement in the strength of concrete. In this article, cost analysis is also carried out and combined iron powder is found to be the most effective material among four different combinations of concrete mixers for both strength and cost.
Download for More DetailsMODE SHAPE AND NATURAL FREQUENCY IDENTIFICATION OF A PRESTRESSED BOX GIRDER BRIDGE IN NONTHABURI, BANGKOK
Authors: Sanjoy Kumar Bhowmik, Md. Monirul Islam, Anisuzzaman Khan, Mohammad Osman Ghone
Published: 2019-December-15
Gradual deterioration of structures leads the engineers towards the Structural Health Monitoring system to confirm the existing serviceability scenario, where modal properties are the indispensable part of the process. Modal properties like modal frequency and mode shape from the service providing structure are essential to adjust the numerical finite element model to make the model more like the existing structure. This study built up the mode shape and computed the natural frequency of a precast box girder bridge to compare with numerical model. The selected bridge for this study is situated close to Bangkok city known as canal crossing bridge. A finite element model was developed based on as built drawing, and then, the model was updated with the existing structure’s modulus of elasticity. The ultrasonic pulse velocity test was conducted to obtain modulus of elasticity data. Then accelerometers data were collected under ambient vibration situation from each predefine station to find the modal properties. The study found that mode shape and natural frequency for first mode are similar for both calculated from acceleration data and numerical model.
Download for More DetailsTHE COMMONALITIES OF TOPICAL DEVELOPMENT IN IELTS EXAMINATION AND NNS-NNS CONVERSATION
Authors: Shahneela Tasmin Sharmi
Published: 2019-December-15
Background: Standardized tests like IELTS Speaking examination has various parameters to gauge the English speaking competency of an individual. . However, there are doubts whether conversations that occur in standardised tests bear resemblance to real-life conversations. Since these tests assess an individual’s conversational proficiency, it is important to examine the resemblances in order to understand whether a natural conversation can take place in tests. Objective: To understand the differences between the IELTS speaking interview and real-life conversations. Methods: The paper is heavily reliant on qualitative data. An original discourse between two NNSs from Bangladesh pursuing postgraduate degree in England was recorded for the purpose. They engaged in conversation in a non-institutionalised environment. Result: Although the questions for IELTS examinations are pre-set unlike in genuine conversation, the former bears similarity with real-life conversations. Both speakers act as 'examiners' in conversation: Speaker A initiates conversation through topic changes or topic fading, while Speaker B uses back-channelling to allow Speaker A to keep the floor.
Download for More DetailsDEVELOPING PASSENGER CAR UNIT (PCU) AT SIGNALIZED INTERSECTION IN CONTEXT OF BANGLADESH
Authors: Md. Monirul Islam, Soumik Nafis Sadeek, Jobair Miah, Forhad Hossain
Published: 2019-December-15
Passenger Car Unit (PCU) is an important metric to measure traffic load in transportation system. PCU measures the impact of different transport modes on traffic variables compared to passenger car. It converts the heterogeneous traffic into homogeneous traffic condition. PCU, itself is dynamic in nature, so, it changes in regular basis depending on road environment and traffic condition. PCU varies country to country and even within the country. Developed countries have sufficient research on determining PCU for their own highways, but developing countries like Bangladesh has extreme laggings in determining PCU for its built roadways. So, this research contributes to estimate PCU at signalized intersections based on traffic speed and volume using multiple linear regression model. Our results suggested PCU values of motorbike, autos, buses and trucks, which give different results compared to Highway Capacity Manual (HCM). In some cases, motorbikes possess PCU more than 2.0 which indicates its ample influence of creating traffic anomaly at intersections. Also, bus possesses PCU more than 6.0 which indicates large queue and illegal maneuver of heavy vehicles while entering or exiting into an intersection.
Download for More DetailsTECHNOLOGY ENHANCED LANGUAGE LEARNING AND TEACHING FOR THE TERTIARY LEVEL STUDENTS OF BANGLADESH: POSSIBILITIES AND CHALLENGES
Authors: Md. Mukibuzzaman Khan, Ms. Imrana Islam
Published: 2019-December-15
The use of technology has been increasing in higher education for decades and educational research has demonstrated different ways of integrating the use of technology into ESL teaching. The expansion of the information and communication technology has provided ESL teachers with the technological tools that can be implemented as pedagogical instruments in classrooms. The research, therefore, focuses on participants’ views regarding the integration of technology in language learning activities and the educators’ views on the possibilities and challenges of technology enhanced language teaching in ESL classrooms in Bangladesh. The study explores the participants’ views through a survey among sixty tertiary level students of three institutions and sixteen language teachers of the same institutions. The findings of the research are useful for ESL teachers to know about the possibilities and challenges of using technology in ESL teaching in Bangladesh.
Download for More DetailsANALYSIS NUMERICALLY AND USING THE RANKING FORMULA: CAUSES OF THE LOAN CLASSIFICATIONS AND IMPACT ON THE PROFITS OF THE PUBALI BANK LIMITED
Authors: Runu Biswas
Published: 2019-December-15
Loan classification is a common phenomenon in the banking arena. Firstly, this study observes loan classification and recovery of loan classification within 5 consecutive years of Pubali Bank Limited. Secondly, it tries to identify the causes of a loan classification from both the bankers and the defaulted customers’ points of view of the Pubali Bank Limited. Thirdly, it talks about the impact on profit of Pubali Bank Limited for the classified loan. And finally, it forwards some suggestions for improving the recovery performance of the classified loans. To identify the causes of loan classification, a total of 200 respondents’ opinions have been taken which are randomly collected from 473 different branches of Pubali Bank Limited. The recovery of classified loans and the classified credit outstanding are hugely different from the years 2012 to 2016. To investigate the causes of loan classification, a questionnaire-based survey has been conducted to collect the primary data. The study shows that the lack of loan supervision is the vital reason for loan classification which is marked by the 62% defaulted customers; while on the other hand 66% bankers traced that the most important cause for the loan classification is lack of loan supervision. This study describes that the classified loan rate is the most important issue that has negative effect on bank profitability and inability to survive. Classified credits of the Pubali Bank’s will not end in a blink, they have to reduce gradually. Therefore, Pubali Bank will have to train the customers before and after distribution loan, create reasonable interest rates, monitoring clients and select the genuine borrowers through fair investigation.
Download for More DetailsMULTI STEP AHEAD WIND SPEED FORECASTING USING LONG SHORT TERM MEMORY RECURRENT NEURAL NETWORK
Authors: Firuz Ahamed Nahid , Jubaer Alam, Khadiza Akter
Published: 2019-December-15
This paper proposes a multi-step ahead wind speed forecasting approach utilizing Long Short Term Memory Recurrent Neural Network – LSTMRNN (a deep learning technique). Accurate wind speed forecasting is the prerequisite to harvest maximum power from windmills. Proper forecasting of wind speed directly impacts the generation, demand management and unit commitment of windmills. In this research, one year’s historical dataset consisting of wind speed, relative humidity and temperature of thirty minutes interval has been considered to train the proposed LSTMRNN model. The model’s performance has been evaluated by Mean Absolute Error (MAE), Root Mean Squared Error (RMSE), and Mean Absolute Percentage Error (MAPE). The performance of the proposed model has also been compared with another machine learning model called Convolutional Neural Network – CNN. The results show that the proposed model can forecast wind speed with much better accuracy in comparison with CNN.
Download for More DetailsDESIGN OF A BROAD BAND - STOP FILTER WITH METAMATERIAL AS DEFECTIVE GROUND SYSTEM
Authors: Md. Jubaer Alam , Firuz Ahamed Nahid , Md. Turiqul Islam
Published: 2021-December-15
In this article, a defected ground structure (DGS) is introduced to design a broad band-stop filter to adjust the resonating characteristics by varying the dimension of the structure. The proposed antenna is embedded into a 50Ω microstrip framework. FR-4 (Lossy) is used as a substrate to design the proposed broad band-stop filter which has a succinct structure. The attainment of the antenna is explored both integrally and experimentally. Here Complementary Split Ring Resonator (CSRR) is introduced in the ground layer. It has been monitored that the level of rejection of the filter in the stopband region keeps on going with the introduction of CSRR. This filter is advisable for X-band applications especially on 5.9 to 11.3GHz. The Nicolson-Ross-Weir approach has been applied at the filtering frequency. The effective electromagnetic parameters retrieved from the simulation of the S-parameters imply that metamaterial antenna shows negative refraction bands. This indicates that the proposed antenna has behavior to justify the obligation as a Left Handed medium.
Download for More Details