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Publication (5)

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Safiri, S. (2)
Sullman, M. J. M. (2)
Ali, Shazia F. (1)
Ashrafi-Asgarabad, A. (1)
Berik, Pelin (1)

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Biogas (1)
Biomedical Engineering (1)
D(36) shear-mode (1)
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2015 - 2018 (5)

Recent Submissions

Prognostic value of pathologic grade for patients with oral squamous cell carcinoma: Methodological issues
Safiri, S.; Sullman, M. J. M.; Ashrafi-Asgarabad, A.;( Publisher: Wiley2018-07-01)
Subchondral tibial bone texture predicts the incidence of radiographic knee osteoarthritis: data from the osteoarthritis initiative: methodological issues
Mansori, K.; Sullman, M. J. M.; Safiri, S.;( Publisher: Elsevier BV2018-06-01)
Piezoelectric torsional actuation in d(36) shear-mode PMN-PT single crystals
Berik, Pelin; Chang, Wei-Yi; Jiang, Xiaoning;( Abstracts: This paper presents an experimental and numerical characterization of a piezoelectric d(36) shear-based torsion actuator made of xPb(Mg1/3Nb2/3)O-3-(1-x)PbTiO3 (PMN-PT) single crystals embedded between Polydimethylsiloxane (PDMS) layers. The generated rate of twist value of the piezoelectric d(36)-mode PMN-PT single crystal composite torsion actuator was obtained using a laser vibrometer from the maximum detected transverse deflection measurement. The quasi-static torsion actuation experiments were conducted on the piezoelectric d(36) torsion actuator by applying different AC voltages at 1 Hz. The experimental benchmark was further modelled by Finite Element (FE) code ABAQUS (R) using three dimensional (3D) piezoelectric finite elements. The experimental results and Finite Element computations showed good agreement. Findings reveal that more rate of twist is produced by PMN-PT single crystals in comparison to piezoceramic alternatives. This piezoelectric PMN-PT d(36)-mode composite torsion actuator can be effectively used in torsional deformation control.; 2018-03-08)
This paper presents an experimental and numerical characterization of a piezoelectric d(36) shear-based torsion actuator made of xPb(Mg1/3Nb2/3)O-3-(1-x)PbTiO3 (PMN-PT) single crystals embedded between Polydimethylsiloxane...
A fully integrated autonomous power management system with high power capacity and novel MPPT for thermoelectric energy harvesters in IoT/wearable applications
Tabrizi, Hamed Osouli; Jayaweera, H. M. P. C.; Muhtaroglu, Ali;( Abstracts: This paper reports a fully integrated autonomous power management system for thermoelectric energy harvesting with application in batteryless IoT/Wearable devices. The novel maximum power point tracking (MPPT) algorithm does not require open circuit voltage measurement. The proposed system delivers 0.5 mA current with 1 V regulated output based on simulations, which is the highest output current for a fully integrated converter reported in the literature for ultra-low voltage applications, to the best knowledge of the authors. Regulated 1 V output can be achieved for load range >2 k Omega, and input voltage range >140 mV. The circuit has been implemented in UMC-180nm standard CMOS technology and simulated.; 2017-11-17)
This paper reports a fully integrated autonomous power management system for thermoelectric energy harvesting with application in batteryless IoT/Wearable devices. The novel maximum power point tracking (MPPT) algorithm do...
Greenhouse effect reduction by recovering energy from waste landfills in Pakistan
Zuberi, M. Jibran S.; Ali, Shazia F.;( Abstracts: Landfills all around the world are one of the major sources that contribute towards global warming and climate change. Although landfilling should be prioritized last in the waste management hierarchy due to highest greenhouse gas emissions as compared to other waste management systems it is still very common around the world. In this study, methane emissions are estimated by applying First Order Decay model to landfills in Pakistan over the latest data available by Pakistan Environmental Protection Agency. Results demonstrate that nearly 14.18 Gg of methane is emitted from the landfills in Pakistan each year. By combusting this methane in the form of biogas collected from the landfills as a waste management scheme we can reduce greenhouse effect up to similar to 88%. Same percentage is observed when we apply the similar analysis over the potentially improved practice. Also, Pakistan is facing severe economic crises due to continuous increasing gap between energy demand and supply. Demand is increasing exponentially while supply is observed to remain constant over the last few years due to frozen capacity in spite of having significant renewable/alternate energy resources. Current electricity shortfall has reached up to 6000 MW. Present operational landfills in Pakistan can only contribute up to similar to 0.1% to cater the total deficit which does not make any significant difference but if 75% of the total waste generated today is collected and 50% of it landfilled then Pakistan has the potential to produce similar to 83.17 MW of power that can contribute up to 1.4% to overcome the current power shortage. The outcomes of this paper may also be applicable to other developing countries having similar resources. ; 2015-04-01)
Landfills all around the world are one of the major sources that contribute towards global warming and climate change. Although landfilling should be prioritized last in the waste management hierarchy due to highest greenh...
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