Volume 8, Issue 2, July 2013http://dspace.daffodilvarsity.edu.bd:8080/handle/123456789/16282024-03-28T10:48:41Z2024-03-28T10:48:41ZlittleStudy On The Shear Strength Of Foundry Sand Cores Using Clay And Cassava Starch As BinderAkinlabi, OyetunjiS.O, Seidu,A. I, Opaluwahttp://dspace.daffodilvarsity.edu.bd:8080/handle/20.500.11948/9262019-05-29T05:12:23Z2013-07-01T00:00:00ZlittleStudy On The Shear Strength Of Foundry Sand Cores Using Clay And Cassava Starch As Binder
Akinlabi, Oyetunji; S.O, Seidu,; A. I, Opaluwa
Sand cores for casting intricate shapes were produced from Ojolofe silica sand using cassava starch and Iyoloko clay, Idah Kogi State Nigeria as binders. Various compositions (6 – 12% water 4 – 12% cassava starch and 5% Iyoloko clay) and Ojolofe silica sand were mixed to produce standard cores samples of two different types (green and baked). Cores samples were baked at different temperatures ranging from 90 and 200oC for 60 – 150 minutes. Determination of shear strengths was carried out on a large number of green and baked cores samples. Appropriate baking conditions and optimum core mixtures were established for cassava starch/clay bonded cores at 180oC and 2 hours respectively; and clay addition was found to increase both the green and baked strengths values. The optimum clay/starch core mixture with the best shear strength values was found to be core produced with 10% starch, 10% water and 5% clay. Their green and baked shear strength values were 31.1 KN/m2 and 498.1 KN/m2 respectively. These values were found to be adequate for production of strong sand cores using starch/clay as binders for non-ferrous and ferrous castings as collaborated by successfully casting of a T – joint pipe aluminum casting.
2013-07-01T00:00:00ZEnergy Consumption by Battery Operated Auto-rickshawsRana, Md. SohelHossain, FahimRoy, Shuvangkor ShusmoyMitra, Suman Kumarhttp://dspace.daffodilvarsity.edu.bd:8080/handle/20.500.11948/9252019-05-29T05:12:23Z2013-07-01T00:00:00ZEnergy Consumption by Battery Operated Auto-rickshaws
Rana, Md. Sohel; Hossain, Fahim; Roy, Shuvangkor Shusmoy; Mitra, Suman Kumar
The paper contains primary data based analysis on the energy consumption aspect of battery operated auto-rickshaws which is one of the crucial issues in the transportation system of a developing country like Bangladesh. Several aspects associated with the mode such as its energy consumption rate, effects of recharging of the mode on local town’s energy provision capacity, and the mode’s contribution in attenuation of transport related emissions are explored in the paper. The paper with scientific research outcomes would provide guidelines to the policy makers of a country regarding whether and how to incorporate the mode in the local town’s transportation system.
Battery operated auto-rickshaw offers lower travel cost than rickshaw and greater travel comfort than other urban para-transits like auto tempo, nosimon and public transport like minibus, and therefore attracts urban passengers significantly from those modes. Around 88% of people living in a city where battery operated auto-rickshaws are available, use the mode now to meet their travel demand. Through attracting passengers from fuel operated vehicles, thus the mode replaces them at great extent. A considerable percentage of daily electricity demand of local towns is consumed by the mode which creates pressure on local electricity supply in turn. However, considering the duration and period of load shedding caused due to recharging the mode, energy consumption by the mode can be negotiated as the mode is liable only for 1.53 hours of load shedding a day which takes place at off-peak period (between 11:00 PM and 7:00 AM) at night
2013-07-01T00:00:00ZEffect Of Microencapsulating Of Denim Fabrics With Herbal Extract On The Handle And Care PropertiesSumithra, M.Raaja, N.Vasugihttp://dspace.daffodilvarsity.edu.bd:8080/handle/20.500.11948/9242021-01-28T05:25:31Z2013-07-01T00:00:00ZEffect Of Microencapsulating Of Denim Fabrics With Herbal Extract On The Handle And Care Properties
Sumithra, M.; Raaja, N.Vasugi
In recent years, handle and Care properties has become a major requirement in textiles. .In the present study focuses on the micro-encapsulation to the 100 % cotton denim fabric using three herbal extracts of Ricinus communis, Senna auriculata and Euphorbia hirta to impart their antimicrobial efficiency by finishing the methanol extracts of these herbs on the denim fabric. The combinations of 1 part of Ricinus communis, 3 part of Senna auriculata and 2 part of Euphorbia hirta and conditions by ENISO20645 have been studied and the antimicrobial efficiency of these extracts (1:3:2) and the conditions of 20kgf/cm2 pressure and 20m/min rpm speed are followed by pad dry cure method for best results. To enhance the durability of the finished fabric, treated and washed samples are tested using such test methods- Drape Coefficient (%) (IS 8357/1977) ,Air Permeability Test (IS 11056: 1984) etc ,SEM and FTIR .The result indicated that the drapabilty and crease recovery of the sample was found increased after washes along with air permeability increase.The maximum was noticed in washed samples. Further the stiffness was found predominantly reduced after washing, and no change noticed in water repellency. In the SEM analyzed it was clear that the microcapsules were present in interstices of the fiber assembly of fabric even after 30 washes proving the adherence of the finishing in the samples and in the FTIR the stretching frequencies were found to exist even after 10, 20 and 30 washes.
2013-07-01T00:00:00ZEffect of Variable Electric Conductivity on Radiative Heat Transfer Flow along a Vertical Plate of Micropolar Fluid with Variable Heat Flux and Uniform Source (or Sink) in a Porous MediaUddin, M. J.http://dspace.daffodilvarsity.edu.bd:8080/handle/20.500.11948/9232019-05-29T05:12:25Z2013-07-01T00:00:00ZEffect of Variable Electric Conductivity on Radiative Heat Transfer Flow along a Vertical Plate of Micropolar Fluid with Variable Heat Flux and Uniform Source (or Sink) in a Porous Media
Uddin, M. J.
A two-dimensional steady convective flow of a micropolar fluid past a vertical porous flat plate in the presence of radiation with variable heat flux has been analyzed numerically. The local similarity solutions for the flow, velocity profile, microrotation and heat transfer characteristics are illustrated graphically for various parameters entering into the problems. The effects of the pertinent parameters on the local skin friction coefficient, plate couple stress and the heat transfer are also calculated. Effect of variable electric conductivity and constant electric conductivity has been analyzed numerically for the skin friction coefficient and rate of heat transfer. The result shows that for Magnetic field parameter, Prandlt number, temperature dependent heat source (or sink) parameter and space dependent heat source (or sink) parameter, the variable electric conductivity is high pronounced than that of constant electric conductivity for micropolar fluid for both the case of skin friction coefficient and Nusselt number.
2013-07-01T00:00:00Z