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Hollow Nanotubes of N‐Doped Carbon on CoS

Angewandte Chemie 2016年第51期128卷

作者： Yuming Chen Xiaoyan Li Kyusung Park Limin Zhou Haitao Huang Yiu‐Wing Mai John B. Goodenough Department of Applied Physics The Hong Kong Polytechnic University Hong Kong China Texas Materials Institute and Materials Science and Engineering Program The University of Texas at Austin Austin TX 78712 USA Department of Mechanical Engineering The Hong Kong Polytechnic University Hong Kong China Centre for Advanced Materials Technology (CAMT) School of Aerospace Mechanical and Mechatronics Engineering J07 The University of Sydney NSW 2006 Australia

Low‐cost, single‐step synthesis of hollow nanotubes of N‐doped carbon deposited on CoS is enabled by the simultaneous use of three functionalities of polyacrylonitrite (PAN) nanofibers: 1) a substrate for loading active materials, 2) a sacrificial template for creating hollow tubular structures, and 3) a precursor for in situ nitrogen doping. The N‐doped carbon in hollow tubes of CoS provides a high‐capacity anode of long cycle life for a rechargeable Li‐ion or Na‐ion battery cell that undergoes the conversion reaction 2 A + +2 e − +CoS →Co+A 2 S with A=Li or Na.

关键词： Anodenmaterialien Batterien Cobalt N-dotierter Kohlenstoff Nanoröhren

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The effect of radiative heat transfer on slip flow through parallel-plate microchannels 15

The effect of radiative heat transfer on slip flow through p...

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15th International Heat Transfer Conference, IHTC 2014

作者： Shojaeian, Mostafa Zamanian, Rahim Kosar, Ali Mechatronics Engineering Program Faculty of Engineering and Natural Sciences Sabanci University Tuzla Istanbul34956 Turkey International Campus Mechanical Engineering Group Amirkabir University of Technology Tehran Iran

A wide range of applications in Micro-Electro-Mechanical systems (MEMS) has attracted many investigators in fluid flow and heat transfer in micro scale. As a continuation of ongoing research on this field, in the current study, thermal analysis of steady-state fully developed laminar gaseous flow in a parallel plate macro- and microchannel with two different constant heat fluxes at walls (asymmetrically heated walls) was considered. The rarefaction and viscous heating effects were also taken into consideration. The radiative heat transfer effect was examined through the inclusion of Rosseland approximation term in the energy equation. The first order slip velocity and temperature jump boundary conditions were implemented at the wall. Closed-form expressions were analytically obtained for temperature distributions and Nusselt number. The results indicate that increasing either Brinkman number or radiation parameter causes a decrease in heat transfer rate for the symmetrical wall heating case. Furthermore, when the wall is exposed to asymmetric wall heating, in contrast to heat fluxes ratio, increasing the radiation parameter decreases Nusselt number of lower wall. Also, increasing either the radiation parameter or heat fluxes ratio results in a reduction in Nusselt number of upper wall beyond singularity points existing in this case, whereas the opposite behavior is observed for Nusselt number of upper wall prior to these points.

关键词： Microchannels

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Dynamic analysis of the proton exchange membrane fuel cell

Dynamic analysis of the proton exchange membrane fuel cell

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2nd International Conference on engineering and technology Innovation 2012, ICETI 2012

作者： Tseng, Jung-Ge Hsiao, Der Ren Huang, Bo Wun Bachelor Program of Medical Engineering Cheng Shiu University Kaohsiung Taiwan Department of Technology Education National Science And Technology Museum Kaohsiung Taiwan Graduate Institute of Mechatronics Engineering Cheng Shiu University Kaohsiung Taiwan

ISBN: (纸本)9783037856123

Hydrogen energy fuel cell is one of the clean/green energy solutions for the environmental pollution, global warming, and petroleum energy shortage. This study investigates the dynamic characteristic of the green hydrogen energy fuel cell: Proton Exchange Membrane Fuel Cell (PEMFC). PEMFC has been adopted to be the power supplier of the vehicle, small train, etc. A lot of researchers aim on pure electrical property analysis. However, to put PEMFC power system on the road, some mechanical properties of the system should also been examined. In this paper, the dynamic characteristic of a single PEMFC is studied. A single PEMFC is set up and measured for the time and frequency response. Several fundamental modes are found experimentally which should be avoided during operation period of PEMFC especially in a moving vehicle. © (2013) Trans Tech Publications, Switzerland.

关键词： Frequency response

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Modeling and simulation of levitating ball by electromagnet using bond graph 1

Modeling and simulation of levitating ball by electromagnet ...

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1st International and 16th National Conference on Machines and Mechanisms, iNaCoMM 2013

作者： Mishra, Anand Kumar Raina, Rashmi Bahaduryadav, Sher Verma, Alok Sarangi, Somnath Saha, Anubhuti Mechatronics Program Indian Institute of Technology Patna Patna India Department of Electrical Engineering Indian Institute of Technology Patna Patna India Department of Mechanical Engineering Indian Institute of Technology Patna Patna India Department of Electrical Engineering Sikkim Manipal University Sikkim India

Magnetic Levitation has been a keen area of research, especially in the field of automotive where low losses due to friction and low energy consumption are important considerations. This paper offers the theoretical and experimental idea of the magnetic force control in the magnetic levitation system using the bond graph modeling approach considering the nonlinearities. The corresponding levitation apparatus comprises of an electromagnet, a ferroelectric material base, a steel ball and position sensors. The force generated by the electromagnet causes the levitation action over the ball by balancing the gravitational force exerted on the ball. The present work describes the linear and nonlinear model using signal flow graph and bond graph approach. Transfer function of the setup is obtained using signal flow graph and correspondingly the balancing action of the ball at its levitating position is performed using a PID controller. Lastly the overall system stability is validated using root locus approach.

关键词： Magnetic levitation

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Indoor robot localization by RSSI/IMU sensor fusion

Indoor robot localization by RSSI/IMU sensor fusion

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International Conference on Electrical engineering/Electronics, Computer, Telecommunications and Information technology, ECTI-CON

作者： Veerachai Malyavej Warapon Kumkeaw Manop Aorpimai Department of Control Instrumentation and Mechatronics Faculty of Engineering Mahanakorn University of Technology Bangkok Thailand The Electrical Engineering Graduate Program Faculty of Engineering Mahanakorn University of Technology Bangkok Thailand

Localization is the crucial problem for mobile robot navigation. For indoor mobile robot, since a global positioning system (GPS) is incapable, another promising technique to detect the position is the received signal strength indicator (RSSI) from wireless communication. To improve the precision and robustness of mobile unit localization, an inertial measurement unit (IMU) is normally used. In this report, we propose the algorithm for mobile robot localization based on sensor fusion between RSSI from wireless local area network (WLAN) and an IMU. The proposed fusion scheme is based on the extended Kalman filter (EKF). The experiment is conducted by using mobile unit equipped with low-cost IMU and a wireless communication module together with access points to evaluate the performance of our algorithm, and the result is promising.

关键词： Robot sensing systems Noise Mobile communication Wireless communication Mathematical model Sensor fusion Kalman filters

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Retraction Note

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Metals and Materials International 2014年第6期20卷 1169-1169页

作者： Chang-Suk Han Chang-Hwan Chun Seung-Oh Han Chang-Sup Oh Kyung-Wan Koo Jang-Woo Kim Young-Woo Kim Chang-Hwan Bae Ju-Hee Lee Dept. of Defense Science & Technology Hoseo University Chungnam Korea Research Center for Convergence Technology Hoseo University Chungnam Korea Reseat Program Korea Institute of Science and Technology Information Daejeon Korea Dept. of Defense Science & Technology Hoseo University Asan-si Chungnam Korea School of Display Engineering Hoseo University Chungnam Korea Dept. of Automotive Engineering Hoseo University Chungnam Korea Dept. of Mechatronics Eng. Graduate School of M. T. & M. Hoseo University Chungnam Korea

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A microassembly process to realize angular vertical comb electrodes for a gimbal-less two-axis electrostatic scanner

A microassembly process to realize angular vertical comb ele...

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IEEE International Conference on Micro Electro Mechanical Systems

作者： Min-Ho Jun Seunghwan Moon Jong-Hyun Lee Graduate School of Information and Mechatronics Gwangju Institute of Science and Technology Gwangju South Korea Graduate-program of Medical System Engineering Gwangju Institute of Science and Technology Gwangju South Korea

This paper proposes a microassembly process that easily realizes a gimbal-less two-axis electrostatic MEMS scanner with fixed angular vertical comb electrodes (FAVCs). The fabrication steps can be remarkably reduced by employing a microassembly, as there is no need to add an insulation layer and conduct a multi-step etching process for SVCs. The reduction in the number of fabrication steps also improves the device yield and reduces fabrication errors. The proposed scanner can be readily applied to various optical applications, as the slow axis is driven by quasi-static operation, allowing the amplitude of the scanning angle to remain constant within a specific frequency range.

关键词： Microassembly Springs Electrostatics Silicon Optical device fabrication Mirrors

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Selectively bonded polymeric check valve for the reliable regulation of intraocular pressure

Selectively bonded polymeric check valve for the reliable re...

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作者： Im, Seongmin Mun, Byungphil An, Jaeyong Choi, Jongchan Yang, Sung Lee, Jonghyun School of Mechatronics Gwangju Institute of Science and Technology Gwangju Korea Republic of Graduate Program of Medical System Engineering Gwangju Institute of Science and Technology Gwangju Korea Republic of Department of Nanobio Materials and Electronics Gwangju Institute of Science and Technology Gwangju Korea Republic of

ISBN: (纸本)9789898425379

A glaucoma drainage device for the regulation of intraocular pressure is presented. The device consists of three biocompatible polymer layers: the cover (top layer), the diaphragm (intermediate layer), and the baseplate with a cannular (bottom layer). Finite element analyses (FEA) were performed to find optimal design parameters for the targeted cracking pressure: the diameter of orifice, the thickness of intermediate layer, the width of the channel, and the overlapped length of the orifice over valve seat. Top and bottom layers were made by polydimethylsiloxane (PDMS) replica molding process, and an intermediate thin layer with through-holes was fabricated by PDMS fill-in molding method and hydrophobic treatment. The overlapped area of the bottom layer was coated with Cr and Au by using PDMS as a shadow mask. Metal layers are not to be bonded between the bottom and the intermediate layers so that the device showed the enhanced reliability in operation and the higher yield in production. Oxygen plasma treatment was performed for irreversible bonds between separate three PDMS layers. The experimental cracking pressure of the fabricated valve was 2.50 kPa, which is very close to the target value (2.67 kPa). The experiments showed that the proposed polymer check valve can regulate the pressure of the aqueous humour, fluid in an anterior chamber, within the normal intraocular pressure range (15-20mmHg) with a high repeatability.

关键词： Polydimethylsiloxane

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Largely deformable surface electrode based on PDMS for cortical recording and stimulation

Largely deformable surface electrode based on PDMS for corti...

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International IEEE/EMBS Conference on Neural engineering, CNE

作者： Namsun Chou Soonki Yoo Sohee Kim School of Mechatronics Gwangju Institute of Science and Technology Gwangju South Korea Faculty of the school of Mechatronics and Graduate Program of Medical System Engineering Gwangju Institute of Science and Technology Gwangju South Korea

This paper describes a largely deformable surface electrode based on poly-dimethylsiloxane (PDMS) substrate, including its fabrication, electrochemical characterization, adhesion test, and bending test results. The fabricated electrode is made of both PDMS and parylene C layers, which are completely attached to each other. Between the two parylene layers gold patterns are located in the mechanical neutral plane. In the fabrication process, PDMS is supported by parylene layer when the metal layer is sputter deposited, resulting in no cracks. The electrode provides highly deformable neural electrode structure with mechanical integrity and electrical stability. With these advantages, it is expected to be suitable in stable neural recording and stimulation.

关键词： Electrodes Adhesives Substrates Metals Impedance Impedance measurement

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Characterization of shape and deformation of tympanic membranes by dual-wavelength lensless digital holography

Characterization of shape and deformation of tympanic membra...

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2011 SEM Annual Conference on Experimental and Applied Mechanics

作者： Lu, Weina Furlong, Cosme Rosowski, John J. Cheng, Jeffrey T. Merchant, Saumil N. Center for Holographic Studies and Laser Micro-mechaTronics Department of Mechanical Engineering Worcester Polytechnic Institute Worcester MA United States Eaton-Peabody Laboratory Massachusetts Eye and Ear Infirmary Boston MA 02114 United States Speech and Hearing Bioscience and Technology Program MIT-Harvard Division of Health Sciences and Technology Cambridge MA United States

ISBN: (纸本)9781461402183

We are developing an advanced computer-controlled digital optoelectronic holographic system (DOEHS) with the ability to measure both shape and acoustically induced deformations of the tympanic membrane of several species, including humans. The DOEHS consists of laser delivery (LD), optical head (OH), and computing platform (CP) subsystems. The LD subsystem houses two tunable near-infrared laser sources, an acoustic modulator to enable stroboscopic illumination, and laser-to-fiber mechanisms to couple light into one single mode polarization maintaining fiber. The output of the LD subsystem is delivered into the OH subsystem through the polarized maintaining fiber (PM), which is arranged to perform imaging and measurements by phase-shifting lensless digital holography. A high-resolution digital camera, contained within the OH subsystem, is used for image recording at high-rates while the CP subsystem acquires and processes images in either time-averaged or double-exposure holographic modes. Shape measurements are performed by double-exposure mode with a different laser source used in each one of the exposures whereas deformation measurements are obtained by using a single laser source. We present preliminary results of our investigations of acoustically induced motions on tympanic membrane and the transfer of these motions to the ossicular chain, including results on sample preparation for measurements with the DOEHS.

关键词： Infrared devices

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