Volume 6 Issue 1
Table of Contents
- A Study on Indoor Thermal Comfort by Roof Top Gardening
Page: 7-18 Ashadul Islam, Julias Seazer - Assessment of Gaseous Pollutants and Particulate Matters in Air of Different Industrial Locations of Khulna Division
Page: 19-42Md. Khorshed Ali, M. Jamaluddin Ahmed - A Comparative Study of Mel-LPC Based Bangla Speech Recognition Under Clean and Noisy Condition
Page: 43-56Umme Muslima, Ananda Ghosh - A Comparative Investigation to Control Drift in Tall Buildings by Study of Structural Parameters
Page: 57-60Iftesham Bashar, Md. Abdul Jalil Mia, Iqbal Hossain - An Automated Irrigation System (AIS) Using Soil Moisture Sensor and Microcontroller
Page: 73-81A.Kader, M. Bapery, A. Shorif, A G M B Mustayen - Comparative Study among Different Delay Estimation Models at Signalized Intersection
Page: 82-94Saurav Barua, Md. Mahmud Hasan Mamun - Case Study on Effluent Treatment Plant of ACS Textiles (Bangladesh) Limited
Page: 95-106Sayeda Ummeh Masrura, Kazi Shafayet Haider - Design of Rectangular Microstrip Patch Antenna and Optimization of it with Slot in Patch for Dual Band using CST Software
Page: 107-114Md. Qamarul Hasan - Modified Roof-Top garden as a Tuned Mass Damper for vibration control of Building Structure under Earthquake Excitation
Page: 115-128Mohammad Sabbir Rahman, Atik Sarraz Mohammad, Saiful Islam - Quality Assessment of Municipal Water Supply In Dhaka city- A Case Study In Saidabad Area
Page: 129-145Romana Saila - Techno Economic Feasibility Study of the Use of Hollow Blocks in Building Construction Practice in Bangladesh
Page: 146-155Md. Kamrul Hassan Mohammad, Sabbir Rahman, Md Ariful Hassan Mojumder - Temperature Dependency of the Swelling of Biopolymer Gel
Page: 156-165Israt Kabir - Water loss in distribution system of Zone-V and Korail slum as a sub system
Page: 166-181Aysha Akter, Pinki Datta, Md. Iftakharul Alam Khan
A Study on Indoor Thermal Comfort by Roof Top Gardening
Ashadul Islam1 , Julias Seazer2
Abstract : Roof top gardening is an effective way to ensure the indoor thermal comfort naturally. The objective of the study is to investigate the degree of comfort attained by the roof top gardening and to reduce energy consumption in building. This experiment was conducted on a two-storied urban R.C.C. building. The two main parameters of thermal comfort, air temperature and humidity were measured by ‘THERMO RECORDER’. To identify the ability of roof top gardening in reducing indoor air temperature the roof top was covered by greenery and compared with bare roof. The data loggers were placed at ceiling inside the room. To determine the reduction in temperature caused by roof top gardening they were placed under shade made by greenery and bare roof that is exposed to the environment. The temperature and humidity data were recorded every 10 minutes interval. The data obtained from the data logger was used to show the seasonal variation of temperature and humidity in graphical form. The result obtained from the analysis shows that maximum 6.8oC indoor temperature can be reduced by roof top gardening in summer season and 31% of total cost of electricity can be saved.
Keywords: Roof top gardening, indoor thermal comfort, energy consumption, data logger thermal comfort parameters.
Assessment of Gaseous Pollutants and Particulate Matters in Air of Different Industrial Locations of Khulna Division
Md. Khorshed Ali[1], M. Jamaluddin Ahmed[2]
Abstract— Khulna City is the second port city of Bangladesh. Various Industries are located in Khulna Division. That’s why a study plan was undertaken to measure the gaseous pollutants level in the air and also study the atmospheric particulate matters in different industrial locations of Khulna Divisions. Atmospheric pollutants like gaseous (SO2, NO2), particulate matters (SPM) were determined in different urban locations of Khulna Division in the month of August, 2008 to February, 2009. Nine different sampling stations of Khulna Division such as British American Tobacco, GLT Plant, Kushtia , Vera Mara Power Station, Kushtia, Akter Agro and Fertilizer In. Ltd , Nitol Cement Factory, Avoy nagor, Jessore , Ahab Jute Mill , Baliadanga ,Jessore, BRB Cable In. BSCIC Kushtia , Kiam Metal In. BSCIC Kushtia, Kiam Metal In. BSCIC Kushtia , Khorshed Metals Industries, BSCIC, Shiromoni, Khulna , Nishung Jute Mill, Magura were selected for sample collection. The maximum concentrations of SPM was observed in British American Tobacco, GLT Plant, Kushtia (East Side) the value was 288 µgm-3 .The maximum concentrations of SO2 and NO2 was observed in Khorshed Metals Industries, BSCIC, Shiromoni, Khulna and the values were 56.8 µgm-3 and 63.94 µgm-3 respectively. The lowest concentrations of SPM was observed in Residential Area, 1.5 Km southwest from , Vera Mara Power Station, Kushtia and the value was 89.20 µgm-3 . The lowest concentrations of SO2 and NO2 was observed in Residential Area, 1.5 Km southwest from Vera Mara Power Station, Kushtia and the values were 7.90 µgm-3 and 10.10 µgm-3 respectively. The values of SPM, SO2 and NO2 in air of above locations of Khulna Division are lower than that of TLV value recommended by WHO and DoE. Comparatively the air of Khulna Division is less polluted.
Keywords: Khulna Division; air pollution; particulate matter; gaseous pollutants.
A Comparative Study of Mel-LPC Based Bangla Speech Recognition Under Clean and Noisy Condition
Umme Muslima[1] Ananda Ghosh[2]
Abstract–This paper shows the comparison between noisy and clean data for recognition of Bangla speech. The used database consists of two sets of data – one is for training containing 3824 utterances of Bangla digit sequences of 20 male and 20 female speakers and the other one is test dataset containing 1985 utterances of 21 male and 21 female speakers. Front-end has been designed using Mel-LPC analysis. The Mel-LPC is a time-domain feature and computationally efficient. In this estimation process bilinear transformation is not required, and frequency warping is obtained by using a first-order all-pass filter instead of unit delay. The final recognition experiments show the differences between noisy and clean data. The recognition accuracy are found to be 98.24%, 98.27%, 97.02%, 97.90% for clean test sets clean1, clean2, clean3 and clean4, respectively and 67.87%, 47.49%, 53.162%, and 60.076% for subway, babble, car, and exhibition respectively. i.e recognition accuracy for clean data is much better than noisy data.
Keywords: Mel-LPC, HMM, Bangla Database.
A Comparative Investigation to Control Drift in Tall Buildings by Study of Structural Parameters
Iftesham Bashar[1], Md. Abdul Jalil Miah[2], Iqbal Hossain[3]
Abstract-The rapid growth of urban population and the consequent pressure on limited space have considerably influenced city residential development, which eventually initiated the construction of high-rise structures. For such structures, deflection analysis is very important. Moreover, adequate lateral stiffness is a major consideration in the design of a tall building. In this regard, determination of drift and drift index have become of major significance for designing such structures. In this study, a high-rise R. C. C twenty storied building is investigated for drift analysis due to wind load by means of analytical analysis as well as numerical analysis. Comparative study is made to observe the differences of the drift values found from both methods. From the comparative study, it is found that drift values from analytical analysis (Approximate Method) are conservative where numerical analysis tends to overestimate drift values. To observe the drift values for changes of different structural parameters, increasing of slab thickness, moment of inertia of beams and columns and thickness of shear walls are analyzed. Increase of the moment of inertia i.e. depth of beam has a significant effect in reducing the drift of tall building. Increases of moment of inertia of columns are also found to be effective in reducing drift of tall structure. On the other hand, effects due to increase of slab thickness and shear wall thickness are found less efficient to control the drift.
Keywords: Drift, Drift Index, Approximate Method, Numerical Analysis, Parametric Study, Tall Building.
Comparative Study among Different Delay Estimation Models at Signalized Intersection
Saurav Barua[1], Md. Mahmud Hasan Mamun[2]
Abstract: Intersection delay is a performance measure criteria for signalized intersection. Several models have been developed to estimate delays at intersection. This paper presents study of traffic at an arterial road section of Route 18 in New Brunswick, New Jersey, USA which was modeled in Paramics. A similar model was constructed by Synchro to validate simulation model and optimize signals. Simulation data were collected using detectors from ten signalized intersections under three different demand levels. Arrival times collected through the detectors. Average delays were estimated for signalized intersections using MATLAB code. Delay estimated by Webster’s equation perform poorly. Modified Webster’s equation predict intersection delay better for the downstream intersections of the arterials. Under high through traffic, Newell’s equation is more accurate than others.
Keywords: Intersection delay, Paramics, Webster’s equation, Newell’s equation, Synchro, Demand.
Case Study On Effluent Treatment Plant Of Acs Textiles (Bangladesh) Limited
Sayeda Ummeh Masrura[1] Kazi Shafayet Haider[2]
Abstract– The liquid effluents from textile industries are causing a major havoc to the environment, ecology, agriculture, aquaculture and public health as it discharged to the nearby water streams in the country. So, it is time to give a pause to the pollution and phase it out gradually to protect the surface water body specially rivers. It had become a prerequisite to set up ETP in each industrial establishment, particularly at dyeing industries that were discharging huge amount of liquid waste to the rivers every day. Since the highest number of factories is of textile category and these types of factories play a major role in polluting the nature, Government’s main focus is on the textile mills and industries related to textile. But, for the successful implementation of ETPs, industry owners will have to be socially responsible and at the same time, government should provide the factory owners with logistic supports and relaxed timeframe to set up ETPs. This case study aims at observing and assessing current wastewater treatment process of ACS Textiles (Bangladesh) Ltd. Situated at Tarabo, Rupganj, Narayanganj. Though the medium and small scaled industries have a positive impact on the economy of Bangladesh, the increasing industrialization is highly contributing severe pollution to the environment by the toxic waste discharge.
KeyWords: Wastewater from textile industries, ETP, Effluent Charecterstics.
Design of Rectangular Microstrip Patch Antenna and Optimization of it with Slot in Patch for Dual Band using CST Software.
Md. Qamarul Hasan[1]
Abstract—Microstrip patch antennas are versatile in terms of their geometrical shapes and implementation. The light weight construction and the suitability for integration with microwave integrated circuits are two more of their numerous advantages. Additionally the simplicity of the structures makes this type of antennas suitable for low-cost manufacturing. And this is also one key feature why microstrip patch antennas are used in wireless communication applications. Moreover, the microstrip patch antennas can provide dual and circular polarizations, dual-frequency operation, broad band-width, feed line flexibility. Hence an optimized (modifying parameters and adding slot) microstrip rectangular patch antenna is presented in this project for Bluetooth application along with ZigBee. Computer Simulation Technology (CST) microwave studio is used as the software environment to design and compare the performance of the antennas. Based on the results and analysis, it is noted that the optimized patch antenna shows lower return loss than the return loss of regular patch antenna. In addition, optimized patch antenna has improved VSWR than that of the circular patch.
Modified Roof-Top garden as a Tuned Mass Damper for vibration control of Building Structure under Earthquake Excitation
Mohammad Sabbir Rahman[1], Atik Sarraz[2], Mohammad Saiful Islam[3]
Abstract– Tuned Mass Damper (TMD) is very popular to mitigate the vibration of the structure under any type of random loadings like as Wind or Earthquakes. This research work mainly focuses on to modify the roof- top garden as a passive vibration controlling devices (RTGD) using the same principle of TMD. One of the important features of TMD is using huge mass to create the inertial force against earthquake forces. This passive energy dissipation system is not needed any additional mass because the mass of roof garden used as a TMD mass which is come from the mass of soil and plants. The roof and roof-top garden have been isolated by springs which have been given the spring force and also installed a viscous damper to provide the damping force against earthquake forces. Partially saturated soil condition of roof top garden has been taken to avoid the detuning effect. The obtained structural response under different earthquakes proved that this system is one of most capable to mitigate the Earthquake vibration and can be easily used in practically for building the structures.
Keywords: Tuned Mass Damper, RTGD, Vibration Control, Earthquake
Quality Assesment of Municipal Water Supply In Dhaka City –A Case Study In Saidabad Area
Romana Saila[1]
Abstract– The specific objectives of the study were to assess the overall quality of drinking water from source (both surface water and ground water) to user end, to find out the variation of water quality at different locations of the study area, to identify the water quality problems, to study the water use characteristic of the people and to make some recommendations so that safe and adequate quantity of water is available at the user end. In Dhaka city municipal water is supplied by Dhaka Water and Sewerage Authority (DWASA) through 599 deep tube wells (DTWs). As the ground water is not sufficient to satisfy the demand completely, at present water is also extracted from surface water bodies. Surface water is sent into treatment plant before sending into the pipes. It is very important that the water entering the pipes is of good quality. Five different locations were carefully selected around SWTP and samples have been collected from three chosen points – the Main line, service line and underground reservoir of each location.
The samples were then tested for a wide range of water quality parameters included pH, color, turbidity, TDS, alkalinity, hardness, chloride, manganese, TC and FC.
The value of pH varied from 6.20 to 7.22 with an average of 6.73. 22.22% of samples showed deviation from the ECR’97 standard. Minimum value observed was 4.61% lower than the recommended lower limit. Color varied from 0 to 10 mg/L units with an average of 4.23 mg/L units. 0% of the samples showed deviation from the ECR’97 standard. .Turbidity varied from 0.39 to 5 NTU with an average of 1.28 NTU. TDS varied from 103 to 469 mg/L with an average of 379 mg/L. Chloride varied from 27 to 250 mg/L with an average of 91.55 mg/L. No samples showed deviation from the ECR ’97 standard for turbidity, TDS, and chloride. Alkalinity varied from 197 to 249 mg/ as CaCo3 with an average of 199.11 mg/L as CaCO3. Hardness varied from 190 to 248 mg/ as CaCO3 with an average of 209.49 mg/ as CaCO3. 27.70% of the samples showed lower value the recommended lower limit according to ECR ’97. Manganese varied from 0 to 0.111 with an average of 0.063 mg/L. 12.5% of the samples has deviation from ECR ’97. TC varied from 0/100 mL. 50% of the samples were unacceptable according to ECR 97. FC varied from 0/100 mL. 50% of the samples were unacceptable according to ECR 97. Based on the assessment drawn above the necessary recommendations were made for the continuation of present work in future .
Keywords: DWASA, TDS, Hardness, Alkalinity, SWTP, Groundwater Reservoir.
Techno Economic Feasibility Study of the Use of Hollow Blocks in Building Construction Practice in Bangladesh
Md Kamrul Hassan[1], Mohammad Sabbir Rahman[2], Md Ariful Hassan Mojumder[3]
Abstract– Due to the tremendous population growth urban building construction got a significant boost in Bangladesh. Rising demand of fire bricks has been full filled by destruction of agricultural land and soil fertility. Bangladesh is lagging behind in taking the advantages of modern construction materials. To evaluate the technical feasibility and financial viability of the use of hollow blocks a comparative study is conducted using both fire brick and hollow blocks for structural design of a 10 storied building. Bangladesh National Building Code specifications are strictly followed though out the design. The structure is analyzed for both seismic and wind load. It is observed from the obtained results that almost 18% of the gross structural weight is reduced when the building adopted hollow blocks instead of fire brick. Which ultimately leads to the economic benefit of approximately 10% material cost reduction during the construction. This study finds that use of hollow blocks as partition material in construction industry of Bangladesh can be a smart alternative by offering both technical and financially benefits.
Keywords: Hollow Block, Structural Weight Reduction, Bangladesh, Fire Brick, Economic Feasibility.
Temperature Dependency of the Swelling of Biopolymer gel
Israt Kabir[1]
Abstract— Experimental investigations for the effect of temperature on swelling behavior in pure water of a biopolymer gel formed from Gellan were performed. The Gellan gel was prepared without any added salt. The swelling behavior of the gel was extensively studied by observing the swelling ratio as a function of time for various gel concentrations by changing the temperature of immersing water. The data were interpreted in terms of the equilibrium swelling ratio, Qeq. Results suggest that with increasing concentration of Gellan gel, the swelling ability decreases which can be interpreted as being due to restricted mobility of the gellan polymer chains due to further associations of the chains induced by the metallic ions. On the other hand swelling ability of gellan gel decreases with the increase in temperature of water which can be attributed as being due to decrease in the solvent quality with the increase in temperature which may restrict water molecule to penetrate through the gel medium.
Keywords: Gellan gel, Effect of temperature, Equilibrium swelling ratio
Water loss in distribution system of Zone-V and Korail slum as a sub system
Aysha Akter[1], Pinki Datta[2], Md. Iftakharul Alam Khan[3]
Abstract– Demand of water supply for rapidly growing urban population in developing countries is increasing dramatically. As a result demand for additional water sources and infrastructure is growing. Moreover, nearly 40% of the water produced is lost at different levels of the distribution system before reaching the consumers. Korail is one of the slums in Dhaka city suffering a high shortage of water as well as high water loss. In this study, an attempt is made to evaluate the water loss with the available secondary data for Korail slum and Zone-V of DWASA. Water production data that is only available for the entire city and the water consumption as collected from individual customer meter readings was used to evaluate the total water loss of Korail slum and Zone-V, were compared using different performance indicators. Water loss as percentage (UFW) for Zone-V and Korail slum is 14% and 5% respectively. Loss per length of Zone-V is 51.93 m3/km/day whereas loss is only 10 m3/km/day for Korail slum. Loss per connection is about 1118.478 lit/connection/day for Zone-V and 147.09 lit/connection/day for Korail Slum.
Keywords: Water loss, Real losses, Apparent losses, Distribution system, UFW.
UITS Journal of Science & Engineering. ISSN: 2521-8107
