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Articles by A. Rahman
Total Records ( 5 ) for A. Rahman
  A. Rahman , J. Dbais and M. Imteaz
  Problem statement: The urban water supply systems in Australian large cities, which generally depend on large surface water reservoirs, are highly stressed due to rapid urban growth and severe drought conditions during the current decade. To ensure the long term sustainability of urban water supply, various alternative water sources including rainwater tanks, grey water, wastewater and desalination plants are being examined in Australia. In the previous research, it has been shown that rainwater tank of appropriate size, installed in detached small dwellings, can meet a significant proportion of household water demand, but there has been limited study on water savings and financial viability of Rain Water Harvesting System (RWHS) for multistorey residential buildings. This study examines the sustainability of RWHS in multistorey residential buildings in Sydney under different scenarios such as varying roof area, number of floors in the building, water price and interest rate to identify favorable condition where RWHS proves to be sustainable. Approach: A hypothetical multistorey building was considered and various scenarios in relation to site area and floor arrangement were established. A water balance model was developed to calculate water savings for various scenarios. Finally, life cycle costing was undertaken to identify most sustainable RWHS scenario for the hypothetical multistorey building. Results: It was found that a higher roof area is more favorable in terms of water savings and financial benefits. Capital and maintenance costs account for the majority of the expenditure of a RWHS. Plumbing cost forms the largest single component of the capital cost. It is shown that lower interest and increased water price regimes enhance the financial viability of RWHS. Conclusion: It was found that it is possible to achieve "pay back" for a RWHS under some favorable scenarios and conditions thus making the RWHS for multistorey buildings in Sydney sustainable.
  R.A. Hawileh , A. Rahman and H. Tabatabai
 

In this work, a detailed three-dimensional (3D) nonlinear finite element model is developed to study the response and predict the behavior of precast hybrid beam-column connection subjected to cyclic loads that was tested at the National Institute of Standards and Technology (NIST) laboratory. The precast joint is modeled using 3D solid elements and surface-to-surface contact elements between the beam/column faces and interface grout in the vicinity of the connection. The model takes into account the pre-tension effect in the post-tensioning strand and the nonlinear material behavior of concrete. The model response is compared with experimental test results and yielded good agreement at all stages of loading. Fracture of the mild-steel bars resulted in the failure of the connection. In order to predict this failure mode, stress and strain fields in the mild-steel bars at the beam-column interface were generated from the analyzed model. Such fields of stresses and strains are hard to measure in experimental testing. In addition, the magnitude of the force developed in the post-tensioning steel tendon was also monitored and it was observed that it did not yield during the entire loading history. Successful finite element modeling will provide a practical and economical tool to investigate the behavior of such connections.
  M. Amzad Hossain and A. Rahman
  The chemical composition of the methanolic crude extract of the leaves of cabbage samples collected from the local market in Dhaka Metropolitan City (DMC), Dhaka, Bangladesh was analysed by GC-MS. It was determined that 44 compounds, which represented 66% of organic compounds, were present in the methanolic crude extract. The methanolic crude extract contained the major compounds mainly phenanthrene, anthracene, oxalic acid, napthalene, β-pinene, 2-octen-3-ol, 3-octamol and 3,4-dihydroxymendelic acid. Thus, the extract was found different types of compounds such as caffice acid and mono, di and tri terpenes and their respective hydrocarbons. Methanol extract of cabbage samples and the derived fractions of hexane, chloroform and ethyl acetate were tested for anti-fungal activity, which was determined by disc diffusion and Minimum Inhibitory Concentration (MIC) determination methods. The methanol extract and the derived fractions of methanol showed great potential of anti-fungal activity as a mycelial growth inhibition against the tested some fungi such as Sclerotium rolfsii, Rhizoctonia solani, Aspergillus niger and Aspergillus fumigatus in the range of 54.6-68.0% and minimum inhibitory concentration ranging from 500-1000 μg mL-1.
  A. Triwiyanto , P. Hussain , A. Rahman and M.C. Ismail
  An investigation on microstructure and tribological properties of low temperature nitriding on 316L austenitic stainless steel with varies time treatment has been made in the present work. The improvement of wear resistance and surface hardness of nitrided steel were identified related with the increasing of layer thickness due to the extended time of treatment, where the hardness significantly improved with 754 Hv0.01 after 8 h treatment as well as the tribological properties. The nitrided layer properties improvement in this investigation shows that the wear mechanism was confirmed by the results of coefficient of friction measurements that were obtained from pin on-disc wear test ranging averagely from 0.3-0.5 on 8 h nitrided sample compared to untreated (1.4-2.0) and 2-5 N (0.6-0.8) with shorter nitrided time, respectively. This is agree with theoretical approach where minimum value is achieved and represents high wear resistance. Surface morphology were characterized by using FESEM and the micrograph of worn region showed that untreated 316L experienced severe wear, while nitrided steel presented only slight abrasion with shallow and narrower wear track.
  A. Tripathi , S. Sundaram , B.C. Tripathy , B.S. Tiwari and A. Rahman
  In present study we tried to improve the sensitivity of whole cells of cyanobacteria, spheroplasts and thylakoidal fragments of cyanobacteria in which PSII is the main target for most of the herbicides, some heavy metals and organic pollutants. We also screened out the potential of tolerance of different cyanobacterial species for herbicides. These biologically active materials are capable of oxygen evolution by photolysis of water in the presence of light. We performed growth study, chlorophyll a analysis, bioenergetic study, oxygenevolution property using clark’s type oxy electrode for the comparison of activity both in free cell stage and immobilized condition. We recorded the changes in their spectral properties, oxygen evolution and chlorophyll a concentrations in the presence of various herbicides. We determined the I50 values for whole cells of different cyanobacterial species and also recorded peak shifting.
 
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