The Experts below are selected from a list of 105 Experts worldwide ranked by ideXlab platform
Joseph Wang - One of the best experts on this subject based on the ideXlab platform.
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remote electrochemical sensor for monitoring tnt in natural waters
Analytica Chimica Acta, 1998Co-Authors: Joseph Wang, Ron K Bhada, Jianmin Lu, Douglas MacdonaldAbstract:Abstract An electrochemical sensor for remote continuous monitoring of the explosive 2,4,6-trinitrotoluene (TNT) is described. The probe relies on rapid and sensitive square-wave voltammetry at a submersible carbon-fiber working-electrode assembly, connected to a 50ft-long Shielded Cable. Operational conditions have been optimized to meet the specific requirements of remote operations. Tests with untreated river water, groundwater, and drinking water samples, spiked with TNT, displayed results similar to those obtained with synthetic buffer solutions. Due to the low detection potential of TNT, coexisting sample constituents do not contribute to the response. The use of ultrafast square-wave voltammetric scanning, without a regeneration step, leads to a rapid detection of dynamic concentration changes, low ppb detection limits, and high stability. Prospects for using the electrochemical probe for real-time monitoring of TNT are discussed.
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remote electrochemical biosensor for field monitoring of phenolic compounds
Analytica Chimica Acta, 1995Co-Authors: Joseph Wang, Qiang ChenAbstract:A submersible probe for monitoring of phenolic compounds at large sample/instrument distances is described. A specially designed device, comprising a specially designed tyrosinase enzyme electrode coupled to a 50-ft long Shielded Cable (via environmentally sealed connectors), is used. Challenges associated with the adaptation of enzyme electrodes to remote sensing are addressed. Variables relevant to field operations are explored and discussed. The combination of biocatalytic recognition and amperometric transduction offers highly selective measurements of micromolar concentrations of phenolic substrates in untreated river and groundwater samples. The concept seems suited for the remote monitoring of other environmentally relevant compounds via a judicious selection of the biorecognition element.
Qiang Chen - One of the best experts on this subject based on the ideXlab platform.
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remote electrochemical biosensor for field monitoring of phenolic compounds
Analytica Chimica Acta, 1995Co-Authors: Joseph Wang, Qiang ChenAbstract:A submersible probe for monitoring of phenolic compounds at large sample/instrument distances is described. A specially designed device, comprising a specially designed tyrosinase enzyme electrode coupled to a 50-ft long Shielded Cable (via environmentally sealed connectors), is used. Challenges associated with the adaptation of enzyme electrodes to remote sensing are addressed. Variables relevant to field operations are explored and discussed. The combination of biocatalytic recognition and amperometric transduction offers highly selective measurements of micromolar concentrations of phenolic substrates in untreated river and groundwater samples. The concept seems suited for the remote monitoring of other environmentally relevant compounds via a judicious selection of the biorecognition element.
Azzouz Yacine - One of the best experts on this subject based on the ideXlab platform.
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A method to model pigtails of Shielded Cables when using the combined MoM/MTL approach
IEEE, 2016Co-Authors: Vince Morga, Klingle Marco, Riah Z., Azzouz YacineAbstract:International audienceUsing systematically high-voltage Shielded Cables for electric powertrain requires to develop and deploy numerical simulation models to analyze the EMC issues. This paper presents a method to model pigtails of Shielded Cables when using the combined MoM/MTL approach to overcome the limitations of the transmission line theory. As the MoM and MTL methods are both based on different models, there cannot be any numerical connection simultaneously between each other. To study the direct coupling through different numerical models, the proposed model is based on a reformulation of the currents and the voltages at the terminations of the Shielded Cable described by an S-parameters black box. To confirm our approach, a comparison between the standard MTL model and a MoM full-wave model with the proposed method is done in the 10 kHz-300 MHz frequency band. The results of different numerical techniques are presented and are in good agreement
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A method to overcome the load connection restrictions in the combined MoM/MTL approach
IEEE, 2016Co-Authors: Vince Morga, Klingle Marco, Riah Z., Azzouz YacineAbstract:International audienceThis work proposes a mathematical transformation for the sources and the linear loads to overcome the Cable-load connection restrictions applied to a braided Shielded Cable in the combined MoM/MTL approach. When the assumptions of the transmission line theory are nonvalid because of a non-direct current flowing below the Shielded Cable, numerical techniques for solving EMC problems have to be deployed. The proposed model is based on an association of voltage sources and current-controlled voltage sources to reproduce the behavior of the real sources and loads at the terminations of a Shielded Cable. In order to validate this approach, a measurement setup has been proposed to take into account the influence of a non-direct current flowing through a ground plane with a large aperture. The measurement results obtained between 10 kHz and 300 MHz, where the main radio reception EMC issues exist, have been compared to the combined MoM/MTL modified approach. The excellent comparison results prove that combining full-wave numerical techniques and the proposed mathematical transformation can overcome the Cable-load conditions in complex electromagnetic environments
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Influence of car body materials on the common-mode current and radiated emissions induced by automotive Shielded Cables
IEEE, 2015Co-Authors: Vince Morga, Klingle Marco, Riah Z., Azzouz YacineAbstract:International audienceIn order to reduce the radiated emissions due to high power converters in electric and hybrid vehicles, Shielded Cables are systematically used. This paper presents measurement results of the common-mode current and the radiated magnetic field produced by a Shielded Cable when different car body materials are considered. A simple but sufficiently representative measurement setup has been defined and constructed to take into account the impact of the new materials considered in automotive industry, such as low conductive carbon fiber reinforced epoxy. The results obtained allow evaluating the magnetic field produced between 10 kHz and 10 MHz when the Shielded Cable is either inside or outside the car body
Vince Morga - One of the best experts on this subject based on the ideXlab platform.
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Modeling and numerical simulation methodology for the electromagnetic compatibility optimization of the shielding for automotive electric powertrains
2017Co-Authors: Vince MorgaAbstract:Pour répondre aux exigences réglementaires de plus en plus sévères au regard des émissions de CO2, l'industrie automobile voit poindre l'émergence des chaînes de traction électrique dans des structures véhicules en matériaux composites. Dans ce manuscrit, le point de vue du constructeur automobile est considéré. En effet, pour répondre aux exigences automobiles en compatibilité électromagnétique (CEM) pour l'homologation et la protection de la santé des personnes vis-à-vis des champs électriques et magnétiques, le blindage électromagnétique est l'une des solutions de conception les plus utilisées. Afin d'évaluer les meilleurs concepts à moindre coût et réduire autant que possible les délais de prototypage, la modélisation et la simulation numérique doivent encore se développer et être déployées. Les chapitres de ce manuscrit illustrent, étape par étape, la modélisation, la simulation et la validation expérimentale du blindage d'une architecture de chaîne de traction électrique. Dans un premier temps,l'influence d'un matériau composite à savoir l'époxy renforcé en fibres de carbone est étudié sur les émissions conduites et rayonnées en présence d'un câble blindé. Dans un deuxième temps, une méthodologie de modélisation des câbles blindés et des raccords de masse est proposée dans un environnement électromagnétique où la théorie des lignes de transmission classique ne s'applique pas. Pour valider les deux précédentes parties, des bancs de mesure sont proposés et développés. Les résultats expérimentaux sont comparés à la simulation numérique. La dernière partie considère une chaîne de traction électrique simplifiée en présence de boîtiers métalliques, de câbles de puissance blindés, de raccords de blindage et de raccords de masse dans une structure multi-matériaux dans la bande de fréquences 10 kHz - 300 MHz. Les émissions conduites et rayonnées sont analysées en portant une attention particulière à la perturbation de la réception radio.To reach the increasingly stringent regulatory requirements for CO2 emissions, the automotive industry is improving the electric powertrains in car bodies with composite materials. In this thesis report, the point of view of the car manufacturer is considered. The electromagnetic shielding is one of the most important design solutions to respect the electromagnetic compatibility (EMC) requirements for the homologation and the protection of human health with respect to electrical and magnetic fields. In order to evaluate the best concepts at lower costand to minimize prototyping delays, modeling and numerical simulation still need to be developed and deployed.The chapters of this thesis report illustrate, step by step, the modeling, the simulation and the experimentalvalidation of the shielding applied to an electric powertrain. In a first step, the influence of a composite material such as the carbon fiber reinforced epoxy is studied on the conducted and the radiated emissions in presence of a Shielded Cable. In a second step, a methodology to model Shielded Cables and the grounding connectionsis proposed in an electromagnetic environment where classical transmission line theory cannot be applied. Tovalidate the two previous parts, measurement setups are proposed and developed. The experimental results arecompared with the numerical simulation. The last part considers a simplified electric powertrain with metal housings, Shielded power Cables, shielding connections and grounding connections in a multi-material structurein the 10 kHz - 300 MHz frequency band. The conducted and radiated emissions are analyzed with a particular attention to the disturbance of the radio reception
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A method to model pigtails of Shielded Cables when using the combined MoM/MTL approach
IEEE, 2016Co-Authors: Vince Morga, Klingle Marco, Riah Z., Azzouz YacineAbstract:International audienceUsing systematically high-voltage Shielded Cables for electric powertrain requires to develop and deploy numerical simulation models to analyze the EMC issues. This paper presents a method to model pigtails of Shielded Cables when using the combined MoM/MTL approach to overcome the limitations of the transmission line theory. As the MoM and MTL methods are both based on different models, there cannot be any numerical connection simultaneously between each other. To study the direct coupling through different numerical models, the proposed model is based on a reformulation of the currents and the voltages at the terminations of the Shielded Cable described by an S-parameters black box. To confirm our approach, a comparison between the standard MTL model and a MoM full-wave model with the proposed method is done in the 10 kHz-300 MHz frequency band. The results of different numerical techniques are presented and are in good agreement
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A method to overcome the load connection restrictions in the combined MoM/MTL approach
IEEE, 2016Co-Authors: Vince Morga, Klingle Marco, Riah Z., Azzouz YacineAbstract:International audienceThis work proposes a mathematical transformation for the sources and the linear loads to overcome the Cable-load connection restrictions applied to a braided Shielded Cable in the combined MoM/MTL approach. When the assumptions of the transmission line theory are nonvalid because of a non-direct current flowing below the Shielded Cable, numerical techniques for solving EMC problems have to be deployed. The proposed model is based on an association of voltage sources and current-controlled voltage sources to reproduce the behavior of the real sources and loads at the terminations of a Shielded Cable. In order to validate this approach, a measurement setup has been proposed to take into account the influence of a non-direct current flowing through a ground plane with a large aperture. The measurement results obtained between 10 kHz and 300 MHz, where the main radio reception EMC issues exist, have been compared to the combined MoM/MTL modified approach. The excellent comparison results prove that combining full-wave numerical techniques and the proposed mathematical transformation can overcome the Cable-load conditions in complex electromagnetic environments
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Influence of car body materials on the common-mode current and radiated emissions induced by automotive Shielded Cables
IEEE, 2015Co-Authors: Vince Morga, Klingle Marco, Riah Z., Azzouz YacineAbstract:International audienceIn order to reduce the radiated emissions due to high power converters in electric and hybrid vehicles, Shielded Cables are systematically used. This paper presents measurement results of the common-mode current and the radiated magnetic field produced by a Shielded Cable when different car body materials are considered. A simple but sufficiently representative measurement setup has been defined and constructed to take into account the impact of the new materials considered in automotive industry, such as low conductive carbon fiber reinforced epoxy. The results obtained allow evaluating the magnetic field produced between 10 kHz and 10 MHz when the Shielded Cable is either inside or outside the car body
Douglas Macdonald - One of the best experts on this subject based on the ideXlab platform.
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remote electrochemical sensor for monitoring tnt in natural waters
Analytica Chimica Acta, 1998Co-Authors: Joseph Wang, Ron K Bhada, Jianmin Lu, Douglas MacdonaldAbstract:Abstract An electrochemical sensor for remote continuous monitoring of the explosive 2,4,6-trinitrotoluene (TNT) is described. The probe relies on rapid and sensitive square-wave voltammetry at a submersible carbon-fiber working-electrode assembly, connected to a 50ft-long Shielded Cable. Operational conditions have been optimized to meet the specific requirements of remote operations. Tests with untreated river water, groundwater, and drinking water samples, spiked with TNT, displayed results similar to those obtained with synthetic buffer solutions. Due to the low detection potential of TNT, coexisting sample constituents do not contribute to the response. The use of ultrafast square-wave voltammetric scanning, without a regeneration step, leads to a rapid detection of dynamic concentration changes, low ppb detection limits, and high stability. Prospects for using the electrochemical probe for real-time monitoring of TNT are discussed.