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The effects of process parameters on size, density, structure, and field emission properties of Pd-catalyzed carbon nanotubes synthesized by thermal chemical vapor deposition

The effects of process parameters on size, density, structur...

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International Conference on Vacuum Nanoelectronics (IVNC)

作者： S. Wei W.P. Kang W.H. Hofmeister J.L. Davidson Y.M. Wong J.H. Huang Interdisciplinary Graduate Program in Material Science Vanderbilt University Nashville TN USA Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA Department of Chemical Engineering Vanderbilt University Nashville TN USA Department of Materials Science and Engineering National Tsing Hua University Hsinchu Taiwan

In this study, various thicknesses of Pd catalytic films were deposited on Ti/Si substrates and pretreated with NH/sub 3/. The effects of catalyst deposition parameters and NH/sub 3/ pretreatment time (0, 1, and 10 minutes) on the size distribution of Pd catalytic particles, and subsequently, on the diameter and density of synthesized carbon nanotubes (CNTs) were investigated. The CNTs were synthesized by thermal CVD at 750/spl deg/C using methane (CH/sub 4/) as the carbon source, and a mixture of Ar/H/sub 2/ (80 vol.%/20 vol.%) as the carrier gas.

关键词： Carbon nanotubes Chemical vapor deposition Argon Hydrogen Scanning electron microscopy Morphology Substrates Materials science and technology Transmission electron microscopy Carbon dioxide

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Exploration of Breast Tumors Utilizing Noninvasive Near-Field Microwave Imaging

Exploration of Breast Tumors Utilizing Noninvasive Near-Fiel...

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Conference on Precision Electromagnetic Measurements (CPEM)

作者： Wael Saleh David Wright Philip Slade Nasser Qaddoumi Microwave hnaging & Nondestructive Evaluation Laboratory minel Electrical Engineering Program School of Engineering American University of Sharjah Sharjah UAE Electronic Systems Research Group Department of Engineering School of Engineering and Computer Science University of Exeter Exeter UK

A novel microwave nondestructive testing technique is presented for breast cancer detection. A method utilizing the reflection coefficient at the aperture of a waveguide sensor radiating into a breast is described resulting in theoretical microwave images that clearly indicate the presence of a tumor. These images demonstrate the feasibility of detecting breast tumors using this approach

关键词： Breast tumors Microwave imaging Microwave theory and techniques Nondestructive testing Breast cancer Cancer detection Reflection Apertures Waveguide theory Image sensors

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Model of the electromagnetic power pattern of the AIDS virus

Model of the electromagnetic power pattern of the AIDS virus

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Southeastern Symposium on System Theory

作者： Y. Samurin S. Giles H.W. Vayo J. Johnson Electrical Engineering and Computer Science Department University of Tolctlo and Eötvös Lárand University Toledo OH USA Mathematics Department University of Tolctlo and Eötvös Lárand University Toledo OH USA Electrical Engineering Department Tuskegee University Tuskegee AL USA Bioengineering Department University of Tolctlo and Eötvös Lárand University Toledo OH USA

We designed an antenna model of the spherically distributed receptors of the HIV. The model consisted of a combination of electric Hertzian dipole and magnetic dipole antennas. We derived field equations for a 72-element spherical array of electric dipoles, and field equations for a 72-element array of magnetic dipoles. We combined these equations using superposition to model the virus receptors as receiving antennas. The resulting power pattern showed definite maximums at 80- and 280-degree positions, suggesting the virus acted as a radar when scanning for objects such as foreign cells. This work extended results of treating the AIDS virus as an antenna.

关键词： Electromagnetic modeling Acquired immune deficiency syndrome Dipole antennas Equations Toroidal magnetic fields Antenna arrays Receiving antennas computer science Mathematics Biomedical engineering

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Picosecond response of metal-semiconductor-metal ultraviolet photodiodes

Picosecond response of metal-semiconductor-metal ultraviolet...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Jianliang Li W.R. Donaldson T.Y. Hsiang Material Science Program a d olboratory for Laser Energetics University of Rochester Rochester NY USA Laboratory for Laser Energetics University of Rochester Rochester NY USA Department of Electrical and Computer Engineering University of Rochester Rochester NY USA

We studied the ultrafast response in metal-semiconductor-metal ultraviolet photodiodes fabricated on GaN. The best performance of a device with 1-/spl mu/m finger width and spacing showed a 3.5-ps response. The pulse ... 详细信息

ISBN: (纸本)1557527776

关键词： Photodiodes Optical pulse shaping Fingers Energy measurement Gallium nitride Optical devices Ultrafast optics Time measurement Laser theory Rivers

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Optimization of power compression and stability of relativistic and ponderomotive self-channeling of 248nm laser pulses in underdense plasmas

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Physical Review E 2004年第6期70卷 066406-066406页

作者： J. Davis A. B. Borisov C. K. Rhodes Plasma Physics Division Naval Research Laboratory 4555 Overlook Avenue SW Washington D.C. 20375 USA Laboratory for X-Ray Microimaging and Bioinformatics Department of Physics M∕C 273 University of Illinois at Chicago 845 West Taylor Street Chicago Illinois 60607-7059 USA Department of Bioengineering M∕C 063 University of Illinois at Chicago 851 South Morgan Street Chicago Illinois 60607-7052 USA Department of Computer Science M∕C 102 University of Illinois at Chicago 851 South Morgan Street Chicago Illinois 60607-7042 USA Department of Electrical and Computer Engineering M∕C 154 University of Illinois at Chicago 851 South Morgan Street Chicago Illinois 60607-7053 USA

The controlled formation in an underdense plasma of stable multi-PW relativistic micrometer-scale channels, which conduct a confined power at 248nm exceeding 104 critical powers and establish a peak channel intensity of ∼1023W∕cm2, can be achieved with the use of an appropriate gradient in the electron density in the initial launching phase of the confined propagation. This mode of channel formation optimizes both the power compression and the stability by smoothing the transition from the incident spatial profile to that associated with the lowest channel eigenmode, the dynamically robust structure that governs the confined propagation. A chief outcome is the ability to stably conduct coherent energy at fluences greater than 109J∕cm2.

关键词： Laser pulses

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Nanostructured Electrodes for Improved Neural Recording

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MRS Online Proceedings Library 2003年第1期729卷 4111-4116页

作者： Cheung, Karen C. Choi, Yang-Kyu Kubow, Tim Lee, Luke P. Berkeley Sensor & Actuator Center and Department of Bioengineering University of California Berkeley USA Department of Electrical Engineering and Computer Science University of California Berkeley USA

We present a new method of increasing the effective electrode surface for improved neural recording. To optimize the electrode, the impedance can be decreased by introducing surface roughness or nanostructures on the electrode. High aspect ratio pillar-like polysilicon nanostructures are created in a reactive ion etch. Nanostructure robustness in cell culture is examined.

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RJSSim: A reconfigurable job scheduling simulator for parallel processing learning 33

RJSSim: A reconfigurable job scheduling simulator for parall...

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33rd Annual Frontiers in Education, FIE 2003

作者： Góes, Luís F.W. Martins, Carlos A.P.S. Pontifical Catholic University of Minas Gerais Post-Graduation Program in Electrical Engineering Computational and Digital Systems Laboratory Belo HorizonteMG Brazil Pontifical Catholic University of Minas Gerais Computer Science Department Post-Graduation Program in Electrical Engineering Computational and Digital Systems Laboratory Belo HorizonteMG Brazil

ISBN: (纸本)0780379616

In this work, we present and analyze the use of a reconfigurable job scheduling simulator called RJSSim as an aid tool for parallel processing learning. This software is a functional and performance Java-based simulator of job scheduling policies. Our objectives are: to present RJSSim;to show the use of RJSSim and reconfigurability concepts for parallel processing learning. First, we present a prototype of RJSSim and the reconfigurability concept. Then we describe two case studies remarking the main parallel processing concepts and skills students can learn. In the first case study, we analyze two parallel algorithm models. In the second, we do some performance tests among parallel (reconfigurable) scheduling policies and architectures. Then, we analyze the performance through some metrics like response time, idle time etc. Finally we discuss and analyze the use of RJSSim for parallel processing learning. Our main contribution is: an implementation of RJSSim for parallel processing learning. © 2003 IEEE.

关键词： Parallel algorithms

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Controller Design via Adaptive Critic and Model Reference Methods

Controller Design via Adaptive Critic and Model Reference Me...

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International Joint Conference on Neural Networks 2003

作者： Lendaris, G.George Santiago, Roberta McCarthy, Jay Carroll, Michael Systems Science Ph.D. Program Electrical and Computer Engineering Portland State University Portland OR 97201 United States Systems Science Ph.D. Program Portland State University Portland OR 97201 United States Electrical Engineering Department Portland State University Portland OR 97201 United States Computational Neuroscience University of Chicago Chicago IL United States

Dynamic programming (DP) is a principled way to design optimal controllers for certain classes of nonlinear systems;unfortunately, DP is computationally very expensive. The Reinforcement Learning methods known as Adaptive Critics (AC) provide computationally feasible means for performing approximate Dynamic programming (ADP). The term 'adaptive ' in A C refers to the critic 's improved estimations of the Value Function used by DP. To apply DP, the user must craft a Utility function that embodies all the problem-specific design specifications/criteria. Model Reference Adaptive Control methods have been successfully used in the control community to effect on-line redesign of a controller in response to variations in plant parameters, with the idea that the resulting closed loop system dynamics will mimic those of a Reference Model. The work reported here 1) uses a reference model in ADP as the key information input to the Utility function, and 2) uses ADP off-line to design the desired controller. Future work will extend this to on-line application. This method is demonstrated for a hypersonic shaped airplane called LoFL YTE®;its handling characteristics are natively a little "hotter" than a pilot would desire. A control augmentation subsystem is designed using ADP to make the plane "feel like " a better behaved one, as specified by a Reference Model. The number of inputs to the successfully designed controller are among the largest seen in the literature to date.

关键词： Adaptive control systems

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Demonstration of ultrahigh brightness X-ray amplification from xenon hollow atom states at 2.71-2.93 angstroms

Demonstration of ultrahigh brightness X-ray amplification fr...

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European Quantum Electronics Conference, EQEC 2003

作者： Borisov, Alex B. Song, Xiangyang Frigeni, Fabrizio Koshman, Yevgeniya Dai, Yang Boyer, Keith Rhodes, Charles K. Laboratory for X-Ray Microimaging and Bioinfonnatics Department of Physics University of Illinois at Chicago ChicagoIL60607-7059 United States Department of Electrical and Computer Engineering University of Illinois at Chicago ChicagoIL60607-7059 United States Department of Bioengineering University of Illinois at Chicago ChicagoIL60607-7059 United States Department of Computer Science University of Illinois at Chicago ChicagoIL60607-7059 United States

ISBN: (纸本)0780377338

Experimental data of several forms have been obtained which constitute interlocking concordant evidence of amplification in self-trapped plasma channels on several transitions of the Xe(L) hollow atom spectrum at wavelengths in the range λ ∼ 2.71-2.93 Å. Specifically, they are (α) strongly enhanced spectra arising from Xe31+, Xe32+, Xe34+, Xe35+, Xe36+, and Xe37+ ions recorded from the channel in the forward (axial) direction, (β) the measurement of a corresponding spectral narrowing on the directionally enhanced lines emitted from the channel, (γ) evidence for saturation of three of these transition arrays (Xe34+, Xe35+, Xe36+) given by the simultaneous quenching (spectral hole-burning) of the corresponding spontaneous emission from them in transversely recorded spectra only when amplifying channels are present.

关键词： Xenon

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Pixel-to-point Transfer: a Process for Integrating Individual GaN-based Light-emitting Devices in o Heterogeneous Microsystems

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MRS Online Proceedings Library 2003年第1期768卷 481-485页

作者： Luo, Z. S. Sands, T. Cheung, N. W. Chediak, J. A. Seo, J. Lee, L. P. Department of Materials Science & Engineering University of California Berkeley Berkeley USA School of Materials Engineering and School of Electrical & Computer Engineering Purdue University W. Lafayette USA Department of Electrical Engineering University of California Berkeley Berkeley USA Applied Science & Technology Graduate Group University of California Berkeley Berkeley USA Department of Bioengineering University of California Berkeley Berkeley USA

A novel ultra-low-thermal-budget pixel-to-point transfer process based on the excimer laser lift-off and Pd-In transient-liquid-phase bonding scheme was developed for flexible and precise placement of single pixels of GaN-based light-emitting diodes (LED) on target substrates. The transfer was accomplished by (1) temporarily bonding the light-emitting diode (LED) pixel to a specially designed pick-up rod with sapphire substrates facing up using Super Glue., (2) removing the sapphire substrates using laser lift-off, and (3) registering and permanently bonding the LED pixel to the designated area in the target substrates using Pd-In transient-liquid-phase bonding. An oxygen plasma was employed to remove the Super Glue® residue before further microfabrication and system integration was performed. The capability of this technique was demonstrated in the integration of GaN-based LED pixels with pre-fabricated PIN photodiode chips and thin-film bandedge filters, which formed the non-disposable subsystems of a fluorescence-based lab-on-a-chip system. The performance of these integrated LED pixels and the integrated microsystems has been assessed by evaluating the fluorescence intensity as a function of equivalent fluorescein dye concentration using disposable polydimenthyl siloxane(PDMS) microfluidic channels. GaN LEDs with peak emission at 463 nm were used to excite 515nm fluorescence from FluoSpheres® carboxylate-modified fluorescent microspheres (40nm in diamters).

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