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Substrate influence on the characteristics of interdigital-electrode gas sensors

Substrate influence on the characteristics of interdigital-e...

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ieee SSD international Multi-conference on systems, Signals and Devices

作者： A. Fischerauer Ch. Schwarzmuller G. Fischerauer Chair of Measurement and Control Engineering University of Bayreuth Bayreuth Germany

It is well known that miniaturized gas sensors can be obtained by coating a planar interdigital capacitor with a sensitive layer and exploiting the impedance changes induced by analyte incorporation. Commonly, one assumes that the sensor characteristics only depend on the sensitive layer but not on the substrate carrying the interdigital capacitor. However, in many cases, the sensor has to be exposed to higher temperatures. this is true, for instance, when hot exhaust gases are to be monitored or when the functional principle of the sensitive layer requires heating. A case in point are hydrocarbon sensors based on a zeolite layer in contact with a semiconducting metal-oxide such as Cr 2 O 3 . At operating temperatures of several hundred degrees centigrade, the substrate does influence the sensor impedance in a manner that can no longer be neglected. this contribution reports on the model-based interpretation of experimental results which allows one to draw conclusions on this substrate influence. the experiments were carried out with Si, glass, and quartz substrates at 300 degC and in various atmospheres. the current results bear relevance for the design and understanding of all planar interdigital-electrode sensors evaluated by impedance spectroscopy.

关键词： Gas detectors Substrates Temperature sensors Impedance Capacitors sensor phenomena and characterization Coatings Capacitive sensors Gases Monitoring

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distributed And Parallel Multisensor Fusion In the Wavelet Domain

Distributed And Parallel Multisensor Fusion In The Wavelet D...

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2009 ieee international conference on Intelligent computing and Intelligent systems(ICIS2009)

作者： Chen Shaodong the 613th Institute AVIC-1,471009 Luoyang,China Li Jianxun,Jiang Xingtong Department of Automation Shanghai Jiao Tong University Shanghai,China

By combining the wavelet domain filtering and multi-sensor linear information fusion rule,we propose a new distributed and parallel algorithm for multi-sensor information fusion using the theory of wavelet domain multi-scale *** proposed algorithm decomposes the single sensor's information into different scale,and then estimates the target state in different scale;then the local state estimates are transmitted to the fusion-center to get the optimal information fusion *** posterior Cramer-Rao lower bound (PCRLB of the proposed algorithm is also *** example of radar tracking system with three sensors is provided to illuminate the effectiveness of the method.

关键词： Wavelet domain Multi-sensor fusion distributed fusion Information fusion CRLB

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SoC Li-ion battery monitoring with impedance spectroscopy

SoC Li-ion battery monitoring with impedance spectroscopy

引用

ieee SSD international Multi-conference on systems, Signals and Devices

作者： A. Cuadras O. Kanoun Castelldefels School of Technology (EPSC) Electronics Engineering Department Universitat Politecnica de Catalunya Castelldefels Spain Chair for Measurement and Sensor Technology Chemnitz University of Technology Chemnitz Germany

the state of charge (SoC) of Li-ion coin batteries is investigated as a function of impedance variation. Batteries are submitted to highly stressed conditions to simulate the operation of active loads and impedance is measured in real time both for charge and discharge. In particular, modulus and phase dependence as a function of SoC is studied with impedance spectroscopy in the range 40 Hz to 20 kHz. Phase is found to be the most sensitive parameter. It decreases with battery discharge and increases with battery charge. Impedance is simply modelled with a 3 parameters circuit, two resistors and a constant phase element (CPE). Selected frequencies are then proposed to estimate the SoC of the battery.

关键词： Monitoring Electrochemical impedance spectroscopy Frequency estimation Current measurement Charge measurement Battery charge measurement Impedance measurement Stress measurement Circuits Resistors

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Adaptive electromagnetic energy harvesting circuit for wireless sensor application

Adaptive electromagnetic energy harvesting circuit for wirel...

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international conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON

作者： Torkiat Taithongchai Ekachai Leelarasmee Electrical Engineering Department Chulalongkom University Bangkok Thailand

this paper presents a microcontroller controlled electromagnetic energy harvesting system suitable for harvesting energy from a single HV transmission line with current between 65 A and 130 *** system comprises of magnetic power generator, standard voltage multiplier circuit, DC-DC boost converter and microcontroller. An adaptive algorithm has been applied to the microcontroller to adjust the duty cycle of the converter to achieve maximum output power. this enables the harvesting system to convert and store low voltage sinusoidal power induce from magnetic power generator into the battery for energizing various low power applications. the implemented system is able to operate with minimum sinusoidal induced voltage as low as IV and can generate 58 mW at 65 mA line current. Furthermore, simulation and experimental result as well as mathematical analysis are also included in this paper.

关键词： Wireless sensor networks Microcontrollers Power generation Low voltage Magnetic sensors Voltage control Control systems Power transmission lines distributed parameter circuits Magnetic circuits

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Trajectory enabled service support platform for mobile users' behavior pattern mining

Trajectory enabled service support platform for mobile users...

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international conference on Mobile and Ubiquitous systems: Networking and Services (MobiQuitous)

作者： Yanfeng Zhu Yibo Zhang Weixiong Shang Jin Zhou Chun Ying IBM China Research Laboratory China

Existing operational support systems of GSM service providers focus on collecting and maintaining massive rough cell-ID based location data, which cannot satisfy the requirement of new trajectory based services in identifying the behaviors of mobile users. In this paper, we introduce a trajectory enabled service support platform to convert the location data into limited meaningful mobile user's behavior patterns, which benefit the trajectory based services by simplifying the behavior detection. the core technologies of the platform are the pattern selection, which requires to cover the information included in the raw location data as more as possible, and the run-time mining algorithm, which requires less storage space. We propose a new concept, transient entropy, to identify the moving speed of users, and based on which we define and mine four types of behavior patterns: frequent locations, frequent trajectory, meaningful location, and moving mode. By analyzing the sojourn distribution, we find that the sojourn time in each location follows a Zipf distribution, based on which we present a run-time algorithm to mine the behavior patterns with less storage space. A realistic experiments is given to validate the proposed platform and algorithms.

关键词： Wireless sensor networks Monitoring Shape Fires Wireless communication distributed computing Medical services Discrete event simulation Microelectronics Communications technology

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Rod shape testing by high frequency eddy current -Passive impedance measurement-

Rod shape testing by high frequency eddy current -Passive im...

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ieee SSD international Multi-conference on systems, Signals and Devices

作者： Jens Weidenmuller Christian Sehestedt Olfa Kanoun Jorg Himmel Laboratory of Sensor Technology and Measurement Engineering University of Applied Sciences Koblenz Remagen Germany Fakultät für Elektro-und Informationstechnik Technische Universität Chemnitz-Zwickau Chemnitz Germany

For the rod shape measurement of hot rolled round steel bars (rods) the high frequency eddy current method is especially well suited as it requires no contact point and is not limited to below the Curie temperature. Defects of the rod's shape can be detected by measuring the impedance spectrum of the RLC-oscillator. In the first laboratory setup an Agilent impedance analyser was used for initial tests. Nevertheless, this setup cannot be applied in a steel plant due to the difficult environmental conditions. Hence, a vector network analyser for passive impedance measurement that is applicable in these surroundings was developed.

关键词： Shape measurement Eddy current testing Eddy currents Current measurement Impedance measurement Frequency measurement Steel Bars Temperature Laboratories

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Adaptive pruning of event decision trees for energy efficient collaboration in event-driven WSN

Adaptive pruning of event decision trees for energy efficien...

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international conference on Mobile and Ubiquitous systems: Networking and Services (MobiQuitous)

作者： Steffen Ortmann Michael Maaser Peter Langendoerfer IHP Microelectronics GmbH Frankfurt Germany

Wireless sensor networks (WSN) are considered to be the key-enabler for low cost highly distributed applications in the area of homeland security, healthcare, environmental monitoring etc. A necessary prerequisite is reliable and efficient event detection. this paper introduces a novel approach for event configuration and in network processing, called event decision trees (EDT). An EDT enables every node to self-divide event queries according to its resources. EDT autonomously adapt to the tasks assigned, even though it requires to organize collaboration between nodes to deliver expected results. the effort for maintain formal EDT is evaluated by analysis and simulations. Our results show that the proposed lease-based mechanism for maintaining producer/consumer pairs in an EDT outperforms even idealized acknowledgment-based approaches.

关键词： Decision trees Energy efficiency Collaboration Wireless sensor networks Costs Terrorism Medical services Monitoring Event detection Analytical models

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Design of SRD-F-PLL system with consideration of low-pass filter for high dynamic performance during voltage disturbance

Design of SRD-F-PLL system with consideration of low-pass fi...

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international conference on Power Electronics and Motion Control (IPEMC)

作者： Hyeong-Jin Choi Seung-Ho Song Seung-Gi Jeong Ju-Yeop Choi Ick Choy Department of Electrical Engineering Kwangwoon University Seoul South Korea Department of Information Control Engineering Kwangwoon University Seoul South Korea

Usually, LPF (low pass filter) is used in the feedback loop of SRF(Synchronous Reference Frame) - PLL (Phase Locked Loop) system because the measured grid voltage contains harmonic distortions and sensor noises. In this paper, it is shown that the cut-off frequency of the LPF should be designed to suppress the harmonic ripples contained in the measured voltage. Also, a new design method of the loop gain of the PI-type controller in the SRF-PLL is proposed with the consideration of the dynamics of the LPF. As a result, a better transient response can be obtained with the proposed design method. the LPF frequency and PI controller gain are designed in coordination according to the steady state and dynamic performance requirement. this paper shows the feasibility and the usefulness of the proposed methods through the computer simulation and the lab-scale experiments.

关键词： Low pass filters Phase locked loops Distortion measurement Voltage measurement Design methodology Feedback loop Noise measurement Phase measurement Harmonic distortion sensor systems

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Formation control of multiple marine vehicles based passivity-control design

Formation control of multiple marine vehicles based passivit...

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ieee SSD international Multi-conference on systems, Signals and Devices

作者： Jawhar Ghommam Faical Mnif Oscar Calvo Mechatronics and Autonomous System Ecole Nationale dIngénieurs de Sfax Sfax Tunisia University of Balearic Islands Spain

this paper addresses the problem of coordination path following control of multiple autonomous vehicles. Stated briefly, the problem consists in steering a group of vehicles along a specified paths, while holding a desired inter-ship formation pattern. Path-following for each vehicle amounts to reducing an appropriately defined geometric error to zero. We first show a passivity property for the path following system and, next, combine this with a passivity-based synchronization algorithm to coordinate the vehicles along their paths. Vehicle coordination is achieved by adjusting the speed of each vehicle along its path according to information exchanged on the positions of a subset of the other vehicles, as determined by the communication topology adopted. Global stability and convergence of the closed-loop system are guaranteed.

关键词： Marine vehicles sensor arrays Control systems Remotely operated vehicles Communication system control Vehicle dynamics Convergence Motion control Communication networks Network topology

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Cooperation helps power saving

Cooperation helps power saving

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ieee Internatonal conference on Mobile Adhoc and sensor systems (MASS)

作者： Guanfeng Liang Nitin Vaidya Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign Champaign IL USA

ISBN: (纸本)9781424451142

In wireless sensor networks (WSN), energy efficiency is crucial to achieving satisfactory network lifetime. the most commonly used and may be the only efficient method to reduce the energy consumption significantly is to turn off the radios most of the time, except when it has to participate in data communication. the key challenge is to operate the radio at a low duty cycle but still ensure the delay is relatively low. Various power-saving medium-access control (MAC) protocols have been proposed along this thread. However, most of such protocols focus on a point-to-point communication setting, in which a node will drop an overheard packet if it is not the destination. On the other hand, cooperative wireless communication has been drawing extensive attention in the past few years. Node cooperation has been exploited to reduce end-to-end delay, improve transmission reliability, etc. However, not much has been done in utilizing node cooperation to save energy. this idea may sound absurd since cooperation requires more nodes involved in a communication and would result in more energy being consumed. But is this true? In this paper, we will exploit the possibility of cooperative power saving in wireless ad-hoc networks. the trade-off between energy consumption and delay will be studied. Interestingly, our analytical and simulation results show that cooperation can indeed help achieve a better delay-power consumption trade-off. Our results also show that cooperation together with asymmetric power allocation can achieve the optimal delay-power trade-off.

关键词： Delay Wireless sensor networks Energy consumption Energy efficiency Data communication Communication system control Media Access Protocol Yarn Wireless communication Ad hoc networks

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