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Gas sensing properties of WO3-doped ZnO nanoparticles synthesized by flame spray pyrolysis

Gas sensing properties of WO3-doped ZnO nanoparticles synthe...

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IEEE SENSORS

作者： Chawarat Siriwong Katcharin Wetchakun Anurat Wisitsoraat Sukon Phanichphant Nanosciences and Nanotechnology Program Graduate School Chiang Mai University Chiang Mai Thailand National Electronics and Computer Technology Center Pathum Thani Thailand Department of Chemistry Faculty of Science Sukon Phanichphant Chiang Mai Thailand

The flame-made (5/5) pure ZnO and WO 3 -doped ZnO nanoparticles containing 0.25, 0.50, and 0.75 mol% of WO 3 were successfully synthesized by flame spray pyrolysis (FSP). These materials were studied for NO 2 , CO and H 2 gas sensing at different gas concentrations and operating temperatures ranging from 300-400°C in dry air. The crystalline phase, morphology and size of the nanoparticles were characterized by XRD, BET, TEM, SEM and EDS in order to correlate physical properties with gas sensing performance. The gas-sensing results showed that WO 3 doping significantly enhanced NO 2 gas-sensing performance of ZnO nanoparticles. In addition, 0.5 mol% is found to be an optimal WO 3 concentration which gives the highest sensitivity towards NO 2 .

关键词： Zinc oxide Nanoparticles Fires Thermal spraying Crystalline materials Temperature distribution Temperature sensors Crystallization Morphology X-ray scattering

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Hardware Architecture for Particle Swarm Optimization Using Floating-Point Arithmetic

Hardware Architecture for Particle Swarm Optimization Using ...

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International Conference on Intelligent Systems Design and Applications (ISDA)

作者： Daniel M. Muñoz Arboleda Carlos H. Llanos Leandro dos_S. Coelho Mauricio Ayala-Rincón Department of Mechanical Engineering University of Brasilia Brasília Brazil Industrial and Systems Engineering Graduate Program Pontificial Catholic University of Paraná Curitiba Brazil Departments of Computer Science and Mathematics University of Brasilia Brasília Brazil

High computational cost for solving large engineering optimization problems point out the design of parallel optimization algorithms. Population based optimization algorithms provide parallel capabilities that can be explored by their implementations done directly in hardware. This paper presents a hardware implementation of particle swarm optimization algorithms using an efficient floating-point arithmetic which performs the computations with high precision. All the architectures are parameterizable by bit-width, allowing the designer to choose the suitable format according to the requirements of the optimization problem. Synthesis and simulation results demonstrate that the proposed architecture achieves satisfactory results obtaining a better performance in therms of elapsed time than conventional software implementations.

关键词： Hardware Particle swarm optimization Floating-point arithmetic computer architecture Design optimization Computational efficiency Design engineering Algorithm design and analysis High performance computing Computational modeling

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Gratings on porous silicon structures for sensing applications

Gratings on porous silicon structures for sensing applicatio...

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Conference on Lasers and Electro-Optics, CLEO 2009

作者： Liscidini, M. Wei, X. Kang, C. Rong, G. Retterer, S.T. Patrini, M. Sipe, J.E. Weiss, S.M. Department of Physics University of Toronto 60 St. George St Toronto M5S 1A7 ON Canada Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37235 United States Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN 37235 United States Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge TN 37831 United States CNISM and Dipartimento di Fisica 'A. Volta' Università degli Studi di Pavia via Bassi 6 27100 Pavia Italy

We investigate the use of gratings on porous silicon structures for sensing applications. Examples of two classes of systems are studied: grating-coupled waveguide biosensors, and diffraction-based biosensors. © ... 详细信息

ISBN: (纸本)9781557528698

关键词： Biosensors

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Time Series Mining Approach for Noninvasive Intracranial Pressure Assessment: An Investigation of Different Regularization Techniques

Time Series Mining Approach for Noninvasive Intracranial Pre...

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computer science and Information Engineering, CSIE, WRI World Congress on FLAGGED

作者： Shaozhi Wu Peng Xu Shadnaz Asgari Marvin Bergsneider Xiao Hu Biomedical Engineering Graduate Program Henry Samueli School of Engineering and Applied Science University of California Los Angeles USA Neural Systems and Dynamics Laboratory Department of Neurosurgery the David Geffen School of Medicine University of California Los Angeles USA School of Computer Science and Engineering University of Electronic Science and Technology Chengdu China

A data mining framework has been proposed to estimate intracranial pressure (ICP) non-invasively in our previous work. In the corresponding approach, the feature vector extracted from arterial blood pressure (ABP) and flow velocity (FV) is translated to the estimated errors by the mapping function for each entry in the database. In this paper, three different mapping function solutions, linear least squares (LLS), truncated singular value decomposition (TSVD) and standard Tikhonov regularization (STR) are systemically tested to compare the possible effects of different solutions on the non-invasive ICP estimation. The conducted comparison demonstrated that the selection of mapping function solution actually influences the estimation. Among the tested three solutions for mapping function, TSVD and STR show better ICP estimation performance with smaller ICP errors than LLS.

关键词： Cranial pressure Data mining Biomedical engineering Data engineering Spatial databases computer science Feature extraction Arterial blood pressure Biomedical measurements Laboratories

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An agent framework to support sensor networks' setup and adaptation

An agent framework to support sensor networks' setup and ada...

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International Multiconference on computer science and Information Technology, IMCSIT

作者： Edison Pignaton de Freitas Flávio Rech Wagner Tales Heimfarth Carlos Eduardo Pereira Armando Morado Ferreira Tony Larsson IDE - Halmstad University Sweden Computer Science Department UFLA Lavras Brazil Institute of Informatics UFRGS Porto Alegre Brazil Defense Engineering Graduate Program Military Institute of Engineering Rio de Janeiro Brazil IDE - Halmstad University Halmstad Sweden

Sensor networks are being used in several emerging applications not even imagined some years ago due to advances in sensing, computing, and communication techniques. However, these advances also pose various challenges that must be faced. One important challenge is related to the autonomous capability needed to setup and adapt the networks, which decentralizes the control of the network, saving communication and energy resources. Middleware technology helps in addressing this kind of problem, but there is still a need for additional solutions, particularly considering dynamic changes in users' requirements and operation conditions. This paper presents an agent-based framework acting as an integral part of a middleware to support autonomous setup and adaptation of sensor networks. It adds interoperability among heterogeneous nodes in the network, by means of autonomous behavior and reasoning. These features also address the needs for system setup and adaptations in the network, reducing the communication overhead and decentralizing the decision making mechanism. Additionally, preliminary results are also presented.

关键词： Middleware Image sensors computer networks Communication system control Energy resources Decision making

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Assembly of CdSeS(ZnS) quantum dots in langmuir films with tertiary alkyl phosphine ligands

Assembly of CdSeS(ZnS) quantum dots in langmuir films with t...

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Nanotechnology - General - 214th ECS Meeting/PRiME 2008

作者： Giles, Alexander J. Pagan, J. Patel, K. Stokes, E.B. Nanoscale Science Graduate Program Department of Chemistry University of North Carolina at Charlotte 9201 University City Boulevard Charlotte NC 28223 United States Dot Metrics Technologies Charlotte Research Institute University of North Carolina at Charlotte 9201 University City Boulevard Charlotte NC 28223 United States Department of Electrical and Computer Engineering University of North Carolina at Charlotte 9201 University City Boulevard Charlotte NC 28223 United States Center for Optoelectronics and Optical Communications University of North Carolina al Charlotte 9201 University City Boulevard Charlotte NC 28223 United States

ISBN: (纸本)9781615672998

The focus of this paper is to describe studies on pre-prepared hydrophobic CdSeS(ZnS) quantum dots (QDs) at the air-water interface. Surface pressure-area (π-A) isotherms were extensively studied using QDs capped with either trioclylphosphine oxide or triethylphosphine oxide. The role of these two different ligands on monolayer behavior and thin film quality has been investigated using the Langmuir-Blodgett (LB) technique. The thin films were characterized by scanning electron microscopy (SEM), fluorescence spectroscopy, and UV-vis spectroscopy. ©The Electrochemical Society.

关键词： Cadmium compounds

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Comparison of Different Approaches to ICP Dominated Pulse Extraction

Comparison of Different Approaches to ICP Dominated Pulse Ex...

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International Conference on Bioinformatics and Biomedical Engineering (ICBBE)

作者： Peng Xu Shaozhi Wu Shadnaz Asgari Magdalena Kasprowicz Marvin Bergsneider Xiao Hu Center of Neuroinformatics School of Life Science and Technology University of Electronic Science and Technology Chengdu China Neural Systems and Dynamics Laboratory Department of Neurosurgery the David Geffen School of Medicine University of California Los Angeles USA School of Computer Science and Engineering University of Electronic Science and Technology Chengdu China Biomedical Engineering Graduate Program Henry Samueli School of Engineering and Applied Science University of California Los Angeles USA University of California Los Angeles Los Angeles CA US

Changes of ICP waveform morphology are characterized with different patients' states like hypertension, hydrocephalus and traumatic brain injury etc. Morphological clustering and analysis of ICP pulse (MOCAIP) approach is recently developed to extract ICP morphology feature, in which hierarchical clustering is used to extract the dominated pulse. In this paper, we evaluate the feasibility of using principle component analysis (PCA) and independent component analysis (ICA) to extract dominated pulse. The comparative study among clustering, PCA and ICP based approaches shows that PCA approach may be an alternative of clustering approach to extract dominated pulse in a faster fashion when dataset is of large size.

关键词： Independent component analysis Morphology Principal component analysis Biomedical engineering Feature extraction Electrocardiography Tellurium Hypertension Data mining Laboratories

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Introduction to E-democracy minitrack

Introduction to E-democracy minitrack

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41st Annual Hawaii International Conference on System sciences 2008, HICSS

作者： Welch, Eric W. Beaumaster, Suzanne Wolber, David Graduate Program in Public Administration University of Illinois at Chicago Department of Public Administration University of la Verne Department of Computer Science University of San Francisco

No abstract available

ISBN: (纸本)0769530753

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Security in multicast routing in ad hoc network

Security in multicast routing in ad hoc network

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1st International Conference on Emerging Trends in Engineering and Technology, ICETET 2008

作者： Annadurai, P. Palanisamy, V. Kanchi Mamunivar Centre for Post Graduate Studies Government of Puducherry Lawspet Pondicherry India Department of Computer Science and Engineering Alagappa University KaraiKudiTamil Nadu India

ISBN: (纸本)9780769532677

In Recent years, secure communications have become a important subject of research. The new service for wireless and wired networks is to provide confidentiality, authentication, authorization and data integrity. Security has always been a sensitive issue. In fact, this service becomes necessary to protect basic applications, especially E-commerce and bank transactions from a variety of attacks. Ad hoc networks are peer to peer, autonomous networks comprised of wireless mobile devices. The ease and speed of deployment of these networks makes them ideal for battlefield communications, disaster recovery and other such applications where fixed infrastructure is not readily available. Limited bandwidth, energy constraints and unpredictable network topologies pose difficult problems for the design of applications for these networks. The last couple of years have seen renewed research in this field. Specifically in unicast and multicast routing and security issues. In this paper, we address how secure the multicast routing problem for ad hoc networks. © 2008 IEEE.

关键词： Peer to peer networks

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CLM-TCP: TCP Congestion Control Mechanism Using Cross Layer for Wireless Mesh Networks

CLM-TCP: TCP Congestion Control Mechanism Using Cross Layer ...

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International Conference on Parallel and Distributed Systems (ICPADS)

作者： Vagner Nascimento Carlos Gomes Waldir Moreira Antonio Abelém Post Graduate Program in Computer Science Federal University of Para Belem Para Brazil

The Transmission Control Protocol - TCP has been widely researched in many different networking technologies such as wireless, optical, satellite, sensor, and wired since it is the most used protocol on the Internet. In Wireless mesh networks, this protocol still has challenges due to its origin and implementations for wired networks. This paper proposes an adaptation on the congestion control mechanism using information from the network layer to improve TCP performance through the vertical calibration across layer technique. The result is the Cross Layer Mesh - Transmission Control Protocol (CLM-TCP). To show the efficiency of the proposal, simulations in the NS-2 were carried out.

关键词： Cross layer design Wireless mesh networks Wireless application protocol Wireless sensor networks Optical sensors Optical control Optical fiber networks Satellites IP networks Calibration

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