92 research outputs found
Microcontroller based granular urea application attachment for rice transplanter
Full text linkTransplanting and fertilizer application for rice production in Bangladesh are tedious, time consuming and laborious task, and mostly done manually. Mechanical transplanting of rice becoming popular in the country in recent years and few machines have been developed for granular urea deep placement, however, having some limitations. Placing granular urea precisely along with rice transplanting, an attempt was under taken to design and fabricate an electronic control granular urea applicator to be attach with a 4-row walk behind type rice transplanter. Fabrication of the electronic granular urea applicator was done in the workshop of the Department of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh. Physical structure of the attachment was assembled with available parts of BARI granular urea applicator. A DC gear motor was coupled with metering disk shaft to rotate and pick granular urea from hopper. Moreover, its speed was synchronized with the picker speed of the rice transplanter by a microcontroller Arduino Mega 2560. A computer program was developed and compiled successfully into Arduino IDE, where an equation was derived and incorporated into loop control structure. The program can also be used for any kind of applications where variable rate is required. The machine was found successful in test run and laboratory-based experiments. Average spacing of granular urea placement was found 34.71 cm with 1.38% missing hill, Its power requirement was found about 20 W. This innovation provided options for performing granular urea application and rice transplanting, two most laborious tasks simultaneously which might minimize the cost of production as well as human drudgery with an error free manner.This research was supported by ICT Division, Ministry of Posts, Telecommunications and Information Technology, Government of the Peoples’ Republic of BangladeshRahman, Towfiq; Alam, Md Monjurul; Hossain, Md Mosharraf; Mamun, Muhammad. (2019). Microcontroller based granular urea application attachment for rice transplanter. Retrieved from the University Digital Conservancy, https://doi.org/10.3329/jbau.v17i3.43219
Teachers' understanding and practice of CLT in higher secondary level of Bangladesh
Full text linkThis thesis is submitted in partial fulfillment of the requirements for the degree of Master of Arts in English, 2008.Cataloged from PDF version of thesis.Includes bibliographical references (page75-77).Recently, English plays a unique role as an international lingua franca over the world. The fact that English is mostly used worldwide among people for whom it is a second or foreign language is an indicator of such uniqueness. This distinctiveness does not only refer to the language itself, but also to the ways it is taught as a foreign language. Some of the pedagogical principles especially in Bangladesh that have informed foreign language teaching in the last few decades need to be reconsidered when that language is taught in English. Some questions need to be addressed, such as to what extent is the CLT framework working in Bangladesh? What beliefs or concepts do teachers have of CLT? What are the teachers’ attitudes toward CLT techniques? What is the role of grammar in the CLT class? What are the teachers’ attitudes toward the prescribed materials designed by national Curriculum and Textbook Board (NCTB) based on the Communicative Language Teaching (CLT) approach for the Higher Second Colleges in Bangladesh? To what extent are CLT activities used in the classrooms? The aim of this study was to investigate the extent to which such issues were part of the belief system of teachers in Bangladesh and what impact they had on actual classroom practice. The findings indicated that the majority of the respondents believed CLT is not working properly in Bangladesh. As a result, we should reconsider the practical implication of CLT in the classrooms. However, the pattern was more complex and variegated than this brief summary might suggest, especially when the teachers’ beliefs were compared to their classroom practice.Islam, Md. MonjurulM.A. in Englis
FIELD PERFORMANCE OF BAU-STR DRYER IN RURAL AREA OF BANGLADESH
Full text linkPaddy drying after harvest is important for reducing loss and storing long term. High moisture promotes the development of insects and molds that are harmful to the grain. It is necessary to adapt technology for drying paddy at small scale traders and farmers’ level as an alternative to traditional sun drying. The low cost BAU-STR dryer would be one of the alternative effective drying technologies. Therefore, the objective of this study was to investigate technical and financial performance of BAU-STR dryer at the field level. The study of BAU-STR dryer was conducted during Boro Season, 2016 at selected areas of Mymensingh and Jessore districts. Air temperature inside grain bin was recorded using 3 ACR Smart Button data logger. Ambient air temperature was recorded using TRH-1000 sensor. Moisture content of the grain was measured at five locations in the BAU-STR dryer during drying operation. The dryer was evaluated with three verities: T1-SL 8, T2-Hybrid Taj, T3-BRRI dhan28 which consider as three treatments. The dryer capacity was 500 kg per batch. The results showed that the temperature and moisture distributions in BAU-STR dryer were uniform. Paddy was dried from moisture content 22.8 to 12.2% uniformly in between 2.5 to 4.8 hours for 500 kg dryer capacity in different treatments. The drying time for larger grain (T1-SL8) was less compared to other two varieties. The drying efficiency was about 52%, 65% and 52% for T1, T2, and T3, respectively. The operating cost of drying was found Tk. 0.87 per kg (diesel engine operated blower) for BAU-STR dryer. The benefit-cost ratio and payback period were found 1.9 and 0.28 yr for diesel engine operated BAU-STR dryer from the experiments at field level of Bangladesh
Effect of dewatering aid dosage in electroforced sedimentation
No full textNowadays wastewater treatment plants are producing huge amount of sludge. The water content of the traditionally dewatered sludge,
resulting from drying beds, centrifuges, vacuum filters, screw press filters and pressure filters, remains a critical factor affecting the
choice of transportation vehicles, transportation costs, and suitability of sludge for incineration. The objective of this study is to
investigate the role of polyacrylamide dose and constant current density on the electroforced sedimentation of sludge dewatering
process. Zinc Oxide slurry was used as model sludge. Electroforced sedimentation experiments of zinc oxide suspended in aqueous
media with and without polyacrylamide were carried out under various constant electric current densities. It was observed that at the
same constant electric current density, the voltage difference was decreasing with the increase of polyacrylamide dose. Moreover, the
highest sedimentation rate was attributed at 1.5% polyacrylamide in electroforced sedimentation of zinc oxide slurry under different
constant current densities
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Performance evaluation of power-operated reapers for harvesting rice at farmers’ field
Full text linkHarvesting is one of the major labor intensive works in rice cultivation. Appropriate harvesting machinery is urgently needed to reduce labor and production costs. Production cost of rice becomes high due to labor shortage and high wage rate during harvesting time. Techno-economic performance of Korean self-propelled reaper (KR), China self-propelled reaper (CR) and BRRI reaper (BR) were evaluated in order to identify the field constrains and problems of the reapers at Mithapukur of Rangpur, Bangladesh during Aman season of 2013. The actual field capacities of the KR, CR and BR were found 0.18, 0.17 and 0.15 ha h–1with the corresponding field efficiency of 55, 68 and 56%, respectively. The variation of field capacity among the models was due to turning time losses, weight of the reaper and operator’s skill. The fuel consumption of the reapers was 4.11, 2.61 and 8.39 l ha–1 for KR, CR and BR, respectively. The shattering loss of paddy harvesting was 1.66, 1.50 and 1.45% for KR, CR and BR, respectively. The break-even area of the reapers was 9.15, 7.82 and 8.43 ha yr-1 for KR, CR and BR, respectively. It is evident that the reaper could be used successfully as labor saving and user friendly technology to eliminate post-harvest problems in Bangladesh
Performance evaluation of power-operated reapers for harvesting rice at farmers’ field
Full text linkHarvesting is one of the major labor intensive works in rice cultivation. Appropriate harvesting machinery is urgently needed to reduce labor and production costs. Production cost of rice becomes high due to labor shortage and high wage rate during harvesting time. Techno-economic performance of Korean self-propelled reaper (KR), China self-propelled reaper (CR) and BRRI reaper (BR) were evaluated in order to identify the field constrains and problems of the reapers at Mithapukur of Rangpur, Bangladesh during Aman season of 2013. The actual field capacities of the KR, CR and BR were found 0.18, 0.17 and 0.15 ha h–1with the corresponding field efficiency of 55, 68 and 56%, respectively. The variation of field capacity among the models was due to turning time losses, weight of the reaper and operator’s skill. The fuel consumption of the reapers was 4.11, 2.61 and 8.39 l ha–1 for KR, CR and BR, respectively. The shattering loss of paddy harvesting was 1.66, 1.50 and 1.45% for KR, CR and BR, respectively. The break-even area of the reapers was 9.15, 7.82 and 8.43 ha yr-1 for KR, CR and BR, respectively. It is evident that the reaper could be used successfully as labor saving and user friendly technology to eliminate post-harvest problems in Bangladesh
Performance evaluation of power-operated reapers for harvesting rice at farmers’ field
No full textHarvesting is one of the major labor intensive works in rice cultivation. Appropriate harvesting machinery is urgently needed to reduce labor and production costs. Production cost of rice becomes high due to labor shortage and high wage rate during harvesting time. Techno-economic performance of Korean self-propelled reaper (KR), China self-propelled reaper (CR) and BRRI reaper (BR) were evaluated in order to identify the field constrains and problems of the reapers at Mithapukur of Rangpur, Bangladesh during Aman season of 2013. The actual field capacities of the KR, CR and BR were found 0.18, 0.17 and 0.15 ha h–1with the corresponding field efficiency of 55, 68 and 56%, respectively. The variation of field capacity among the models was due to turning time losses, weight of the reaper and operator’s skill. The fuel consumption of the reapers was 4.11, 2.61 and 8.39 l ha–1 for KR, CR and BR, respectively. The shattering loss of paddy harvesting was 1.66, 1.50 and 1.45% for KR, CR and BR, respectively. The break-even area of the reapers was 9.15, 7.82 and 8.43 ha yr-1 for KR, CR and BR, respectively. It is evident that the reaper could be used successfully as labor saving and user friendly technology to eliminate post-harvest problems in Bangladesh.J. Bangladesh Agril. Univ. 16(1): 144-150, April 2018</jats:p
Economic Parameter of Maize Sheller for Custom Hire Service in Bangladesh
Full text linkThe main purpose of the study was to determine the economic parameters for developing a maize sheller custom hire entrepreneur and effective schedules for maize sheller operation. Secondary data from various sources and some essential data were collected from primary sources through survey were used in this study. Operating costs were calculated and project financial profitability was determined by farm financial measurement techniques namely, benefit-cost ratio (BCR) and break even use. The operating cost of maize sheller for shelling was found US 1.41 per ton. Based on the operating cost, annual savings for replacement and a profit margin for the entrepreneur, the rent-out charge of the maize sheller is estimated as US 3.21 per ton. The benefit-cost ratio of maize sheller is found 2.34, which is highly profitable venture for an entrepreneur. The break-even use for maize sheller is estimated as 670 hours of operation or 1705 ton of maize shelling. 
Effectiveness of a solar grain dryer for drying paddy seed in Bangladesh
No full textProper and timely drying is needed for producing quality paddy seed. Open sun drying is often produced seed with foreign materials. Solar dryer produced by science for society (S4S), India might be suitable for country like Bangladesh. Therefore, an attempt was taken to evaluate S4S seed dryer at the Workshop, Department of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh. In this experiment, the spatial and temporal distribution of temperature and moisture in S4S solar grain dryer was investigated and the seed quality was also evaluated. The dryer performance was evaluated with six trials in Boro season from May 10 to June 6, 2017 and with three trials in Aman season from November 7 to 11, 2017. Paddy seed samples were also dried by open sun drying in Aman season to compare the performance of the dryer. Depending on paddy variety the capacity of the dryer was 42 to 55kg/batch. Drying rate, drying efficiency and percent of drying loss were calculated. The germination rate and vigor index were also calculated to evaluate the quality of paddy seed. Results revealed that temperature distribution at different locations inside of the dryer was fluctuated within a narrow band. In Boro season, drying time was 13.5 to 29 hours for reducing moisture content from 24.27±3.49 to 12.1±0.86% in. On the otherhand, the drying time required to reduce moisture content of paddy from 16.07±0.06 to 11.00±0.11% was 6.5 to 8 hours in Aman season where in case of sun drying, moisture content was reduced from 16.07±0.06 to 11.19±0.14% within 7.5 to 8 hours. In Boro season, the drying rate and drying efficiency of S4S solar grain dryer were 0.67±0.11% MC/hr and 48.23±6.84%, respectively. The average drying loss measured in S4S solar grain dryer was 0.58±0.19%, respectively in Boro season. In Aman season, the drying rate and drying efficiency of S4S solar grain dryer was found 0.70±0.07%MC/hr and 27.67±3.61%, respectively. The average drying loss measured in S4S solar grain dryer (0.41±0.55 %) was lower than sun drying (2.12±1.24%) in Aman season. The germination and vigor index of S4S solar grain dryer dried paddy seeds were satisfactory ranged 82 to 97% and 1638 to 2232 compared to sun drying ranged 79 to 80% and 1738 to 1973. Thus, paddy seeds can be dried in S4S solar grain dryer without impairing germination and vigor of seed. Farmers can get better quality seed when using S4S solar grain dryer
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