September 2016 (Journal of Modern Science and Technology)

September 2016 (Journal of Modern Science and Technology)

Total Articles - 17

Pages 1 – 15

Author: V. Bychko, Ramit Azad and Biman Tanvir Ahmed

This paper gives a complex algorithm based model for the formalization and automated method of finding the optimal georeferenced solution logistics tasks which can be implemented. In the work a complex algorithm was proposed that finds the optimal plan for transportation of cargo. This algorithm finds the shortest network routes of delivery of goods, distributes vehicle routes and calculates the amount of the costs for transportation of a certain quantity of goods. The algorithm was realized in software prototype and was analyzed solving a particular transportation problem.

Pages 16 – 26

Author: Mohammed Liaket Ali, Riaduzzaman Ridoy, Utsha Barua, and Mohammed Badsha Alamgir

In the modern age of industrialization measuring the flow of fluid in an industry is a major issue for controlling the production process. Along with the flow of fluid, temperature is also a matter of concern for quality maintenance of the product. Keeping those things in mind this project is so designed and fabricated to record the flow rate and temperature of either a liquid (such as oil or water) or a gas (such as natural gas) simultaneously and precisely. And the output is shown in a liquid Crystal Display (LCD). Here a fluid (liquid) is passed through a turbine and rotated it at a rate that is proportional to the rate of flow of the fluid. An opto-sensor will then pick up the turbine rotation and send a pulse signal to the Arduino. A temperature sensor is also used to measure the temperature of the flowing fluid. We calibrated the Sensors with great care that’s why a highly precise results of not more than 3% error were recorded and our data was measured several times. Every time this instrumental setup gave us same stable data with negligible fluctuations.

Pages 27 – 35

Author: Tahzib Mashrik, A.S.M Muktadiru Baized, Lamia Iftekhar and Nova Ahmed

Marsupial animals are a group of mammals where the mother carries around its babies in a pouch (for example, kangaroos). Inspired by this idea from nature, the concept of marsupial robots is developed. We present a system that consists of a multi-terrain "mother robot" and smaller versatile "baby robots". The mother robot would carry in its interior the baby robots through a treacherous and rugged terrain to a central rescue location, while providing rapid, efficient and sheltered transportation. The baby robots can then come out and start urban search and rescue operation by locating and helping people from a collapsed or damaged structure, where it is risky for humans or rescue dogs to enter. Once the job of delivering the baby robots is complete, the mother robot acts as a "base station". It also has the task of transporting the baby robots back to safety after the search and rescue operation is complete. This paper presents a design of a mother robot and baby robot, suitable for urban search and rescue mission.

Pages 36 – 45

Author: M. M. Kamal and A. H. Bhuiyan

The temperature dependence of direct current (DC) electrical conduction in plasma polymerized pyrrole (PPPy) thin films has been discussed in this article. A parallel plate capacitively coupled glow discharge reactor was employed to deposit PPPy thin films and different properties of the films were studied in detail. In the study of DC conduction properties, the current density-voltage (J-V) characteristics of PPPy thin films at room temperature indicated that in the low field region the conduction obeys Ohm’s law but at high field non-linear characteristics were observed. The J-V characteristics at different temperatures showed that the current density in both the voltage regions is increased slightly with increasing temperature which indicated the temperature dependence of the conductivity. From the Arrhenius plots activation energies were calculated in both the low and high temperature region. It is observed that activation energy is decreased with the decrease of temperature which was an indication of a gradual transition to the hopping regime. The change in activation energy at higher temperature in comparison to that at lower temperature has been attributed to a considerable temperature-dependence of SCLC mechanism.

Pages 46 – 49

Author: Kankan Prosad Mandal

TMT re-bar is produced by using QTB process where hot-billets are rolled through several horizontal and vertical rolls then passed through water for quenching purposes. Mecanical properties such as yield strength, Ultimate tensile strength, elongation and bending properties are depends on previous thermo mechanical treatment, billet Chemistry and cooling rate at quenched and tempered bath of re-bars. In this paper, we only discuss about effect of billet temperature and last stand speed on yield strength of re-bar. It is found that high billet temperature produces a low-yeild re-bar where as high speed produces a low yield re-bar too due to soaking effect at furnace and cooling effect at QTB respectively.

Pages 50 – 62

Author: Israt Jahan Duti, Maisha Maliha and Shoeb Ahmed

The paper explores the effect of the quantity of methanol on biodiesel production and its characteristics from Waste Frying Oil (WFO). Based on the results, it progresses to develop a continuous process simulation that can be scaled-up for commercial applications. Pretreatment of WFO was carried out by acid-esterification, followed by base-catalyzed transesterification. Optimum molar ratio of methanol: oil was found to be 6:1 experimentally which was then used in Aspen HYSYS to develop a continuous process flowchart. The properties of the product from both approaches were found to be comparable and satisfactorily compatible with the ASTM standards for biodiesel fuel.

Pages 63 – 74

Author: Debanjali Saha, Md. Shahriar Shafayet Hossain, M. Shahjahan Mondal and Rezaur Rahman

Agriculture is one of the major livelihoods in the coastal Bangladesh and future changed climate is likely to affect the agricultural activities. Different adaptation measures have been taken in response to climate change in coastal Bangladesh. In this study, the agricultural adaptation practices were documented and analyzed according to different criteria to determine the present condition of coastal agriculture under the threat of climate change. Most of the adaptations are found to be practiced in the exterior coastal districts and are taken in response to chronic stresses such as salinity and regular flood and sudden shocks like cyclone and storm surge. Major forms of adaptations are improved crop variety, innovative cropping technique and infrastructural development. Though most of them are found to be sustainable in the long term, they are expected to face some barriers. Also, gender dimension is not addressed in many of these practices. Proper management and maintenance, coordination among implementing organizations, policy formulation and good governance are necessary for the success of future planned adaptations in the coastal region. This will ensure stability of the agricultural activities and development of the coastal inhabitants thus safeguarding the national food security.

Pages 75 – 85

Author: Md. Gulam Kibria and M. Shah Alam Khan

The coastal region of Bangladesh is protected from tidal actions by 139 polders. During cyclone Aila in 2009, several polders failed, causing immense sufferings to the coastal inhabitants. This article presents the results of investigations of the nature of damages and their variations in different sectors in a selected coastal polder of the south-western Bangladesh during Aila. The study was carried out involving the application of various Participatory Rural Appraisal (PRA) tools including Focus Group Discussions (FGDs), Key Informant Interviews (KIIs) and Individual Interviews to obtain information such as damages caused by Aila, cropping pattern, and planting and harvesting time of the crops. The study explored the spatial and sectoral variation in cyclonic damage. The impact of inundation depth and duration on aman rice production was assessed in the study area. In sectoral damages, agriculture was the worst affected. Household and livestock sectors experienced the worst immediate impacts while agriculture faced the most severe long term impacts. The study also reveals that the coincidence of the timing of the cyclonic event with the cropping season will cost the largest amount of loss and damage. The findings of the study will help the policy makers to decide on the appropriate adaptation measures to minimize the impacts of any severe cyclonic disaster in future.

Pages 86 – 96

Author: Ashish M. Husain, Tazrin Hassan Rini, Mohammed Ikramul Haque and Md. Rakibul Alam

In this paper a cost efficient, portable, easily manageable Arduino based device has been presented to monitor air quality. The device works by collecting data of quantity of specific harmful gases and the amount of dust present in the air. This device can be located at any place and the data can be transferred to an Android phone via Bluetooth or simply by connecting the device to a PC/laptop. Data collected by the device from different places can be later examined to make further decisions and analysis about the state of air quality; furthermore, it can also help concerned individuals to act upon it.

Pages 97 – 127

Author: Mitali Parvin, Herman Van Langenhove, Christophe Walgraeve and Do Hoai Duc

Volatile organic compounds (VOCs) are of concern both as indoor and outdoor air pollutants for their potential adverse impact on health of people who are exposed and ability to create photochemical smog under certain conditions. Although VOCs are expected to be an important environmental and health risk factor for the rapidly industrializing countries like Bangladesh but there are limited studies on the outdoor and indoor air levels of VOCs in different environments such as industrial and urban areas. On the other hand, there is no known published data yet to assess the indoor VOCs of residential houses in Bangladesh. Therefore, the presence and concentration levels of VOCs were investigated for urban (Mirpur) and industrial (Tejgaon) areas of Dhaka city, Bangladesh in this study. For this purpose six places were selected in two areas (urban and industrial area) for sampling campaigns from 30 of August 2013 to 11 September 2013. Outdoor and indoor samples from both areas were obtained by means of active sampling using Tenax TA tubes as sorbent material during the sampling time. Analysis and quantification were done by thermal desorption-gas chromatography-mass spectrometry (TD-GC-MS) and internal standard calibration. A total set of 44 VOCs consisting of (cyclo)-alkanes, aromatic compounds, halogenated compounds, oxygenated compounds and terpenes were identified from the six sampling sites. Considering safe sampling volume (SSV) 5 VOCs excluded from the data interpretation. Data were interpreted in terms of total volatile organic compounds(TVOCs) which is the sum of 39 VOCs, individual groups and subgroups of TVOCs. The highest mean of TVOCs was measured in the roadside of the industrial street (mean: 96μg/m3; maximum: around 151μg/m3). The lowest mean of TVOCs was measured in the park of the urban area (mean: 28μg/m3; minimum: around 14μg/m3). Although this work has brought forward new data on VOCs concentrations level on wide range of VOCs, further studies concerning more sites and seasonal variations are recommended.

Pages 128 – 134

Author: Mohammed Liaket Ali, Bodius Salam and Sk M Fahim Shakil

Bio-gas is produced due to bio-degradation of organic materials under anaerobic condition which means oxygen free environment. This research work was conducted to find out the production ability of bio-gas from mesophilic anaerobic digestion of cow dung (CD) using kaolin as an additive. Five laboratory scale digesters were constructed to digest cow dung. Each of the digesters had a capacity of 1 liter and made of glass conical flask. In the experiment 311 gm. of cow dung and 389 gm. water was used. Kaolin was added in four of the digesters with an amount of 0.4, 0.6, 0.8 and 1% (w/w). and one digester was used for digestion of cow dung without kaolin. The digesters were fed on batch basis. Total solid content was maintained 8% (wt.) in the slurry for all the observations. All the digesters were maintained at ambient temperature of 27 – 32 ͦC. Retention time was maximum 54 days for the digestions. With the addition of kaolin total biogas production was found to be increased from 3 to 15% as compared to pure cow dung digestion with 0.6% kaolin gave maximum increase. Maximum 1373 ml/ CD gas was produced on the 49th day and maximum total gas was produced 14373 ml/kg CD for addition of 0.6% kaolin. Whereas without kaolin maximum 608 ml/kg cow dung gas was produced on the 52th day with total gas of 12527 ml/kg cow dung.

Pages 135 – 143

Author: Mirza Md. Symon Reza, Ashutosh Kumar Yadav and Sagar Dasgupta

The Electronics industry is continually striving to achieve improved performance and smaller scales. Both of the targets result in increased heat flux densities within the electronic devices. Mainly the portable devices which are the market driving forces, severely faces this problem of increased heat flux densities. This phenomenon ispushing the researchers forth to implement new methodologies to provide thermal management within such devices. This work addresses the potential of low profile integrated fan and heat sink solutions to electronics thermal management issues, particularly focusing upon possible solutions in low profile portable electronics. We investigated a heat sink design with mini-channel features, applicable to low profile applications. After the analysis on the design the results were discussed for given operating conditions. The operating conditions which includes operating temperatures, fan speed, etc. The geometry of theradial heat sink was modeled in CATIA V5 design software. The analysis was performed on ANSYS-FLUENT software.

Pages 144 – 153

Author: Khairun Nahar, Md. Zahidul Islam and Md. Minarul Islam

In this study the queuing characteristics of Teletalk Customer Care Centre, Rajshahi is observed and analyzed with a multi-server queuing model. The waiting and service costs are also analyzed to determine the optimal service rate and the service rate is utilized to measure the number of servers (Customer Care Officer). TORA optimization software is utilized to identify and analyze the results. Other important performance characteristics (average waiting time of the customer in the system, average no. of people in the system etc.) of the queuing system are also analyzed for different number of server. The existing system is working with 5 servers but it costs high significantly. In this study the optimal number of server for the system is identified with optimum total costs (waiting and service costs).

Pages 154 – 162

Author: Afra Nawar Kabir and K. M. A. Salam

The Intelligent Traffic Control system proposed in this paper goes for diminishing holding up times of the vehicles at traffic signals and providing easy and fast pathways for emergency vehicles such as ambulance. The proposed system is developed on FPGA DE1-SoC Board using Verilog HDL and implementing IR and RFID sensors. From the results of the simulation we have found that the system responses almost instantly to traffic density and switches the traffic lights according to the sensor readings. Moreover, when emergency vehicles are introduced in the simulation, the system adapts appropriately and clears the path for the emergency vehicle ensuring least waiting time.

Pages 163 – 178

Author: Md. Sanowar Hossain, Shahed Mahmud and Md. Mosharraf Hossain

Smooth implementation and controlling conflicting goals of a project with the usage of all related resources through organization is inherently a complex task to management. At the same time deterministic models are never efficient in practical project management (PM) decision problems because the related parameters are frequently fuzzy in nature. The project execution time is a major concern to the involved stakeholders (client, contractors and consultants). For optimization of total project cost through time control, crashing cost is considered here as a critical factor. The proposed approach aims to formulate a multi objective linear programming model to simultaneously minimize the total project cost, completion time and crashing cost within the framework of the satisfaction level of decision maker with fuzzy goal and fuzzy cost coefficients. To make such problems realistic, triangular fuzzy numbers and the concept of minimum accepted level method are employed to formulate the problem. The proposed model leads decision makers to choose the desired compromise solution under different risk levels and the project optimization problems have been solved under multiple uncertainty conditions. The Analytical Hierarchy Process (AHP) is used to rank the multiple objectives to make the problem realistic for the respective case. Here minimum operator method and AHP based weighted average operator method is used to solved the model and the solution is obtained by using LINGO software

Pages 179 – 191

Author: Sonia Akhter, Md. Faisal Arif, Md. Nur-Amin, Nafiz Mustafiz, Roman Khan, Shah Waliullah and Khalid Hossain

Home automation is one of the major growing industries that can change the way people live. Some of these home automation systems target those seeking luxury and sophisticated home automation platforms; others target those with special needs like the elderly and the disabled. Typical wireless home automation system allows one to control house hold appliances from a centralized control unit which is wireless. These appliances usually have to be specially designed to be compatible with each other and with the control unit for most commercially available home automation systems. The developed system can be integrated as a single portable unit and allows one to wirelessly control lights, fans, air conditioners, television sets, security cameras, electronic doors, computer systems, audio/visual equipment’s etc.

Pages 192 – 209

Author: F. A. Samiul Islam

Urban Solid Waste Management Is Considered As One Of The Most Immediate And Serious Environmental Problems Confronting Municipal Authorities In Developing Asian Countries. Although Municipal Authorities Acknowledge The Importance Of Adequate Solid Waste Collection And Disposal As Well As Resource Recovery And Recycling, It Is Mostly Beyond Their Resource To Deal Effectively With The Growing Amount Of Solid Waste Generated By The Expanding Cities. Bangladesh Is A Developing And Densely Populated Country. The Process Of Urbanization Is Increasing Day By Day In This Country. Dhaka Is One Of The Most Heavily Occupied Cities In The World. Over Population And Enormous Consumption Lead To Large Quantities Of Waste. Waste Management Is One Of The Most Instant And Serious Problems Of Dhaka City Corporation. This Research Paper Explores The Problems And Prospects Of Solid Waste Management In Dhaka City. There Is No Single Solution To Improve Solid Waste Management System In Any City. It Must Be Based On Integrated Systems With A Combination Of Different Methods.

Total Articles- 17

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