8 publications
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Experimental Analysis of Physical Parameters in Treated WaterBy Iffat R. Arisa
Abstract: During the first phase, the surface water treatment plant at Saidabad treats 225 million liters of water per day. In the treated water, turbidity, color, total coliform, fecal coliform, and hardness are reduced; on the other hand, conductivity and total dissolved solids increase. In the wet season, turbidity is high due to relatively coarse particle dispersions in river water. All other parameters, such as color, total and fecal coliform, hardness, …
Published in Journal of Water Resource Engineering and Management · Vol. 7, Issue 3, 2020 · pp. 31–37 Read article →
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Investment Analysis and communication Issues for Road AssetsBy Iffat R. Arisa
Abstract: The main purpose of this work is to develop good practices for management of infrastructures. The scope of this practice is mainly focused on pavement network, but it also includes other road assets like bridges, culverts and signs. A preventive maintenance, rehabilitation and reconstruction investment analysis is performed for these assets. The analysis and budgeting is performed for 20 years period to maintain and preserve the existing service level for …
Published in Trends in Transport Engineering and Applications · Vol. 7, Issue 1, 2020 · pp. 1–16 Read article →
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Service Effectiveness of Transportation AssetsBy Iffat R. Arisa
Abstract: In this study, the overall management procedure for transportation assets are discussed. The performance of the assets is evaluated based on quality of service and system effectiveness to meet the expectation of the users, productivity and efficiency, resource utilization and cost-effectiveness. A guideline is established with performance standards and specifications. It is incorporated in lease contract to ensure that a desired minimum performance standard is maintained over the lease period …
Published in Trends in Transport Engineering and Applications · Vol. 6, Issue 3, 2019 · pp. 29–36 Read article →
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Visible and Infrared Light DetectionBy Iffat R. Arisa
Abstract: A circuit is made to detect either visible or infrared light. It is designed by using different light detectors, such as, infrared phototransistor, visible phototransistor, and photoresistor. If no light is shining on the detector in the circuit, the green LED is flashing. When the light is shining on the detector, the red LED starts flashing instead of the green one. Op-amp LMC 6482 builds up a simple voltage follower …
Published in Trends in Electrical Engineering · Vol. 9, Issue 2, 2019 · pp. 20–26 Read article →
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Light Sensor CircuitBy Iffat R. Arisa
Abstract: The presence of light increases current in the photo diode or phototransistor. LM317 supplied lower voltage DC power in the circuit. Capacitors are connected in parallel with the DC output in order to filter out any high frequency AC signal coming from the noise. NE555P Timer produced accurate oscillation. BPV11 is used as a photodiode. LM311 is the comparator and the light on/off is converted to low/ high of the …
Published in Trends in Electrical Engineering · Vol. 9, Issue 2, 2019 · pp. 7–11 Read article →
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Electromagnetic Finite Element Analysis of a Switched Reluctance MotorBy Iffat R. Arisa
Abstract: The objective of this study is to create an ideal model for an ultra-high speed switched reluctance motor generator for automotive turbocharger assistance and energy recovery by using electromagnetic finite element analysis. For this purpose, the transient simulation process is considered. The modelling and analysis of a switched reluctance motor (SRM) is the initial task for the selection of the coupled mover. The SRM must be able to achieve high …
Published in Journal of Automobile Engineering and Applications · Vol. 6, Issue 2, 2019 · pp. 36–48 Read article →
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Finite Element Analysis of Thin Shell Loaded at the CenterBy Iffat R. Arisa
Abstract: Thin rectangular shell structure with clamped edges subjected to concentrated load at the center is modeled as symmetric structure using ANSYS. The shell structure is examined with different length and width combinations. The SHELL181 element is used to model this structure. In general, the results show good agreement with mechanics of materials’ solutions or design tables’ results. A convergence study of the shell structure shows that 10000 elements are sufficient …
Published in Trends in Mechanical Engineering & Technology · Vol. 9, Issue 2, 2019 · pp. 12–20 Read article →
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Development of 12V-30W Solar Cell by Local Materials of Rural BangladeshBy Iffat R. Arisa, Murshed Ali
Abstract: Sustainable social and economic development depends on adequate power generation capacity of a country. In order to increase the power generation by fuel diversification, the development of renewable energy is one of the important strategies. Bangladesh is one of the densely populated countries which do not have sufficient supply of energy. The present crisis in power supply hints at the troublesome time to come ahead. To cope with the exponential …
Published in Journal of Alternate Energy Sources & Technologies · Vol. 7, Issue 1, 2016 · pp. 39–43 Read article →