The Experts below are selected from a list of 129 Experts worldwide ranked by ideXlab platform
Ibrahim Dincer - One of the best experts on this subject based on the ideXlab platform.
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development and optimization of a novel solid oxide fuel cell engine Powering System for cleaner locomotives
Applied Thermal Engineering, 2021Co-Authors: Khaled H M Alhamed, Ibrahim DincerAbstract:Abstract Due to the advantages of high efficiency and fuel flexibility, solid oxide fuel cells have become a prominent option to power the future of heavy-duty transportation. Providing and selecting several solid-oxide fuel cell-based Powering Systems as options for the transportation industry have become an important task. For this reason, the purpose of this paper is to propose a novel Powering integrated System for cleaner rail transportation. A partially-premixed compression ignition engine is integrated for the first time with a solid oxide fuel cell instead of a simple compression ignition engine to evaluate the integrated System performance for locomotives. A detailed thermodynamic model based on energy and exergy analyses is developed and used to evaluate the new Powering System. The power split between the fuel cell and the engine effects on the overall exergy efficiency and total space requirements are explored for the first time in an integrated solid oxide fuel cell-based System through a newly developed optimization procedure using a sequence of multi-objective optimization methods. At the reference case, the overall energy and exergy efficiencies are 80.1% and 77.6%, respectively, which are around 15% more efficient than a simple solid-oxide fuel cell-gas turbine Powering System, because of the new fuel cell-engine integration. The overall exergy efficiency is 78.98% and the total space requirement is 30.73 m3 at the optimum operating point. Moreover, the further originality of this paper is to develop and optimize the performance and sizing of the present integrated System for a limited-space application, namely locomotives.
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a novel integrated solid oxide fuel cell Powering System for clean rail applications
Energy Conversion and Management, 2020Co-Authors: Khaled H M Alhamed, Ibrahim DincerAbstract:Abstract In this study, a novel Powering System for clean railway applications is proposed which is based on an intermediate-temperature Solid-Oxide Fuel Cell (SOFC) integrated with a gas turbine Brayton cycle and steam and ammonia-organic Rankine cycles as power-producing waste heat recovery Systems along with a reversible heat pump for space heating and cooling purposes. Both energy and exergy analyses are conducted on this System for such an application to evaluate it thermodynamically. At the reference case for operating a passenger train, the integrated System has both energy and exergy efficiencies of 68.50% and 66.35%, respectively. Also, a parametric study is presented to understand how different variables can affect the overall performance of the System in terms of efficiencies and electric power outputs delivered to the passenger train. Optimum operating points are suggested and they achieve maximum energy and exergy efficiencies of 79.88% and 77.48%. Redirection of some of the fuel stream to the combustor has a positive effect on the overall efficiency of the System. It can further help the System reach an energy efficiency of almost 79.88% up from 65% for the SOFC alone.
Khaled H M Alhamed - One of the best experts on this subject based on the ideXlab platform.
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development and optimization of a novel solid oxide fuel cell engine Powering System for cleaner locomotives
Applied Thermal Engineering, 2021Co-Authors: Khaled H M Alhamed, Ibrahim DincerAbstract:Abstract Due to the advantages of high efficiency and fuel flexibility, solid oxide fuel cells have become a prominent option to power the future of heavy-duty transportation. Providing and selecting several solid-oxide fuel cell-based Powering Systems as options for the transportation industry have become an important task. For this reason, the purpose of this paper is to propose a novel Powering integrated System for cleaner rail transportation. A partially-premixed compression ignition engine is integrated for the first time with a solid oxide fuel cell instead of a simple compression ignition engine to evaluate the integrated System performance for locomotives. A detailed thermodynamic model based on energy and exergy analyses is developed and used to evaluate the new Powering System. The power split between the fuel cell and the engine effects on the overall exergy efficiency and total space requirements are explored for the first time in an integrated solid oxide fuel cell-based System through a newly developed optimization procedure using a sequence of multi-objective optimization methods. At the reference case, the overall energy and exergy efficiencies are 80.1% and 77.6%, respectively, which are around 15% more efficient than a simple solid-oxide fuel cell-gas turbine Powering System, because of the new fuel cell-engine integration. The overall exergy efficiency is 78.98% and the total space requirement is 30.73 m3 at the optimum operating point. Moreover, the further originality of this paper is to develop and optimize the performance and sizing of the present integrated System for a limited-space application, namely locomotives.
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a novel integrated solid oxide fuel cell Powering System for clean rail applications
Energy Conversion and Management, 2020Co-Authors: Khaled H M Alhamed, Ibrahim DincerAbstract:Abstract In this study, a novel Powering System for clean railway applications is proposed which is based on an intermediate-temperature Solid-Oxide Fuel Cell (SOFC) integrated with a gas turbine Brayton cycle and steam and ammonia-organic Rankine cycles as power-producing waste heat recovery Systems along with a reversible heat pump for space heating and cooling purposes. Both energy and exergy analyses are conducted on this System for such an application to evaluate it thermodynamically. At the reference case for operating a passenger train, the integrated System has both energy and exergy efficiencies of 68.50% and 66.35%, respectively. Also, a parametric study is presented to understand how different variables can affect the overall performance of the System in terms of efficiencies and electric power outputs delivered to the passenger train. Optimum operating points are suggested and they achieve maximum energy and exergy efficiencies of 79.88% and 77.48%. Redirection of some of the fuel stream to the combustor has a positive effect on the overall efficiency of the System. It can further help the System reach an energy efficiency of almost 79.88% up from 65% for the SOFC alone.
Robert Puers - One of the best experts on this subject based on the ideXlab platform.
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a multi coil inductive Powering System for an endoscopic capsule with vibratory actuation
Sensors and Actuators A-physical, 2011Co-Authors: Riccardo Carta, Michael Sfakiotakis, Nikolaos Pateromichelakis, Jef Thone, Dimitris P Tsakiris, Robert PuersAbstract:Abstract The transformation of endoscopic capsules from passive tools to robotic devices is increasingly attracting the interest of the research community. In the past few years, significant progress has been achieved in the areas of microelectronics and electromechanical Systems. However, their use in commercial endoscopic capsules is hindered by their increased power demands, which, to present, cannot be adequately met by embedded power sources. A 3D inductive Powering module, providing over 300 mW to the capsule, overcomes these limitations, thus enabling the integration of active locomotion Systems, as well as advanced diagnostic and therapeutic features. This is demonstrated in the present study by a capsule prototype employing the wireless Powering unit to drive an onboard vibratory motor for capsule propulsion. Simplified models are employed to illustrate the main principle of this vibratory locomotion scheme. Experimental results, involving movement of the prototype in various environments, confirm both the effectiveness of the wireless Powering System, and the efficacy of the vibratory locomotion scheme.
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an inductive power System with integrated bi directional data transmission
Sensors and Actuators A-physical, 2004Co-Authors: Michael Catrysse, Bart Hermans, Robert PuersAbstract:An inductive Powering System is presented, capable of remotely Powering implantable monitoring and stimulating devices. The System is capable of delivering at least 50 mW, with an efficiency of 36% over a distance of 3 cm. The power transfer frequency is 700 kHz. Optimisation of the power transfer efficiency and the misalignment tolerance was obtained using a self-developed design tool. Bi-directional data-transmission is integrated in the System: amplitude modulation is applied for the downlink transmission, absorption modulation for the uplink transmission. Our new System is capable of transmitting data at a maximal bit rate of 60,000 bits/s.
Darrin J Young - One of the best experts on this subject based on the ideXlab platform.
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wireless implantable emg sensing microSystem
IEEE Sensors, 2008Co-Authors: Bradley David Farnsworth, Ronald J Triolo, Darrin J YoungAbstract:This paper presents a wireless, subfascially implantable electromyogram (EMG) sensing microSystem design for intelligent myoelectric control of powered prostheses. The implantable System consists of two Pt-Ir epimysial EMG electrodes, a custom-designed ASIC, and an RF telemetry coil and is capable of wirelessly transmitting digitized EMG data to an external telemeter mounted in a prosthetic socket. The prototype microSystem is powered by a near-field inductive link operating at 8 MHz with 10% DC power transfer efficiency. On-chip rectification and regulation produce stable 2 V and 2.7 V supplies with a DC current driving capability up to 100 muA. The EMG electrodes are interfaced with a differential capacitively-coupled amplifier with 38 dB closed-loop gain, 1 kHz bandwidth, and 78 nVradicHz input-referred noise floor. The amplified EMG signal is then digitized on chip using an 11-bit algorithmic ADC. The digital EMG data can be Manchester-coded and transmitted to the external telemeter using phase shift keying (PSK) modulation scheme on the same wireless link as the inductive Powering System.
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remote rf Powering System for wireless mems strain sensors
IEEE Sensors Journal, 2006Co-Authors: Nattapon Chaimanonart, Darrin J YoungAbstract:A reliable remote radio frequency (RF) Powering System is developed for industrial wireless microelectromechanical Systems (MEMS) strain-sensing applications. The prototype System is insensitive to mechanical rotation and produces a stable DC voltage of 2.8 V with a 2-mA current supply capability from a 50-MHz RF power source with a power conversion efficiency of 11%. An improved efficiency can be expected with an optimized power transmitter design. The CMOS power converter electronics are fabricated in a 1.5-/spl mu/m CMOS process occupying an area of approximately 1 /spl times/1 mm. The achieved DC power is adequate for supplying a high-performance wireless MEMS strain-sensing System.
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remote rf Powering System for mems strain sensors
IEEE Sensors, 2004Co-Authors: Nattapon Chaimanonart, Darrin J YoungAbstract:A reliable remote RF Powering System is developed for industrial wireless MEMS strain sensing applications. The prototype System is insensitive to mechanical rotation and produces a stable DC voltage of 2.8 V with a 2 mA current supply capability from a 50 MHz RF power source with a power conversion efficiency of 11%. An improved efficiency can be expected with an optimized power transmitter design. The CMOS power converter electronics are fabricated in a 1.5 /spl mu/m CMOS process occupying an area of approximately 1 mm /spl times/ 1 mm. The achieved DC power is adequate for supplying a high-performance wireless MEMS strain sensing System.
Roman Genov - One of the best experts on this subject based on the ideXlab platform.
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inductively powered direct coupled 64 channel chopper stabilized epilepsy responsive neurostimulator with digital offset cancellation and tri band radio
European Solid-State Circuits Conference, 2014Co-Authors: Hossein Kassiri, Nima Soltani, Arezu Bagheri, Karim Abdelhalim, Hamed Mazhab Jafari, Jose Luis Perez Velazquez, Tariqus M Salam, Roman GenovAbstract:An inductively powered 0.13µm CMOS neurostimulator SoC for intractable epilepsy treatment is presented. Digital offset cancellation yields a compact 0.018mm2 DC-coupled neural recording front-end. Input chopper stabilization is performed on all 64 channels resulting in a 4.2µVrms input-referred noise. A tri-band FSK/UWB radio provides a versatile transcutaneous interface. The inductive Powering System includes a 20mm × 20mm 8-layer flexible receiver coil with 40% power transfer efficiency. In-vivo chronic epilepsy treatment experimental results show an average sensitivity and specificity of seizure detection of 87% and 95%, respectively, with over 76% of all seizures aborted.
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ESSCIRC - Inductively-powered direct-coupled 64-channel chopper-stabilized epilepsy-responsive neurostimulator with digital offset cancellation and tri-band radio
ESSCIRC 2014 - 40th European Solid State Circuits Conference (ESSCIRC), 2014Co-Authors: Hossein Kassiri, Nima Soltani, Arezu Bagheri, Karim Abdelhalim, Hamed Mazhab Jafari, M. Tariqus Salam, Jose Luis Perez Velazquez, Roman GenovAbstract:An inductively powered 0.13µm CMOS neurostimulator SoC for intractable epilepsy treatment is presented. Digital offset cancellation yields a compact 0.018mm2 DC-coupled neural recording front-end. Input chopper stabilization is performed on all 64 channels resulting in a 4.2µVrms input-referred noise. A tri-band FSK/UWB radio provides a versatile transcutaneous interface. The inductive Powering System includes a 20mm × 20mm 8-layer flexible receiver coil with 40% power transfer efficiency. In-vivo chronic epilepsy treatment experimental results show an average sensitivity and specificity of seizure detection of 87% and 95%, respectively, with over 76% of all seizures aborted.
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cellular inductive Powering System for weakly linked resonant rodent implants
Biomedical Circuits and Systems Conference, 2013Co-Authors: Nima Soltani, Miaad S Aliroteh, Roman GenovAbstract:This paper presents a cellular inductive Powering System for neural interface devices to facilitate chronic physiological studies. The System delivers 21-225 mW of power to a 4cm×4cm planar receiver with 21.5% efficiency. It is shown that the implemented multi-coil power transmission technique creates 5 times less non-ionizing radiation at 10cm distance than a single-coil design, for equal amounts of delivered power. The design also implements a low-cost technique which tracks the location of the animal using an impedance measurement circuit which is also used to tune the individual coils.