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International Solid-State Sensors, Actuators and Microsystems Conference

作者： Zeng, X. Huang, C.-C. Jiang, H. Department of Electrical and Computer Engineering University of Wisconsin Madison Madison WI United States Eye Research Institute University of Wisconsin - Madison Madison WI United States Materials Science Program University of Wisconsin - Madison Madison WI United States

ISBN: (纸本)9781457701573

A method to fabricate complex structures on non-planar surfaces by utilizing a transfer method is presented. 3-dimensional and high-aspect-ratio microelectromechanical systems (MEMS) structures are transferred to flexible membranes, and can be further transferred to any non-planar surfaces. Here, we used a structure formed on a silicon-on-insulator (SOI) wafer by deep reactive-ion etching (DRIE) as an example. Both photoresist SU8-2050 and AZ 4620 were used as the flexible membranes. The effect of the structure and density of pillars on the transferring procedure was studied. Potentially this method could be utilized to transfer any MEMS structures and devices to any non-planar surfaces, thus possessing great potential in MEMS devices. © 2011 IEEE.

关键词： Photoresists

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Designing enhanced classifiers using prior process knowledge: Regularized maximum-likelihood

Designing enhanced classifiers using prior process knowledge...

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2011 IEEE International Workshop on Genomic Signal Processing and Statistics, GENSIPS'11

作者： Esfahani, Mohammad Shahrokh Zollanvari, Amin Yoon, Byung-Jun Dougherty, Edward R. Department of Electrical and Computer Engineering Texas A and M University United States Childrens Hospital Informatics Program at Harvard-MIT Division of Health Sciences and Technology Harvard Medical School Brigham and Womens Hospital United States Phoenix AZ United States

ISBN: (纸本)9781467304900

We propose a novel optimization-based paradigm for designing enhanced classifiers. The proposed paradigm allows us to incorporate available prior process knowledge into classifier design, thereby improving the performance of the resulting classifiers. In this work, we focus on dynamical systems that can be represented as finite-state multi-dimensional stochastic processes that possess labeled steady-state distributions. Given prior operational knowledge of the process, our goal is to build a classifier that can accurately label future observations obtained from the steady-state, by utilizing both the available prior knowledge and the training data. Simulation results show that the proposed paradigm yields improved classifiers that outperform traditional classifiers that use only training data. ©2011 IEEE.

关键词： Random processes

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LOW-FREQUENCY ELECTRONIC NOISE IN GRAPHENE TRANSISTORS: COMPARISON WITH CARBON NANOTUBES

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International Journal of High Speed Electronics and Systems 2011年第1期20卷 161-170页

作者： GUANXIONG LIU WILLIAM STILLMAN SERGEY RUMYANTSEV MICHAEL SHUR ALEXANDER A. BALANDIN Nano-Device Laboratory Department of Electrical Engineering Materials Science and Engineering Program Bourns College of Engineering University of California – Riverside Riverside California 92521 USA Center for Integrated Electronics and Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy New York 12180 USA Ioffe Physico-Technical Institute Russian Academy of Sciences St. Petersburg 194021 Russia Nano-Device Laboratory Department of Electrical Engineering and Materials Science Engineering Program Bourns College of Engineering University of California – Riverside Riverside California 92521 USA

We report results of the experimental investigation of the low-frequency noise in graphene transistors. The graphene devices were measured in three-terminal configuration. The measurements revealed low flicker noise levels with the normalized noise spectral density close to 1/f (f is the frequency) and the Hooge parameter α H ~10 -3 . Both top-gate and back-gate devices were studied. The analysis of the noise spectral-density dependence on the gate biases helped us to elucidate the noise sources in these devices. We compared the noise performance of graphene devices with that of carbon nanotube devices. It was determined that graphene devices works better than carbon nanotube devices in terms of the low-frequency noise. The obtained results are important for graphene electronic, communication and sensor applications.

关键词： graphene 1/ f noise carbon nanotubes low-frequency noise graphene transistors

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EQTL AND MUTATIONAL ANALYSIS OF NB-LRR MEDIATED IMMUNITY TO POWDERY MILDEW

EQTL AND MUTATIONAL ANALYSIS OF NB-LRR MEDIATED IMMUNITY TO ...

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The 13th International Cereal Rusts and Powdery Mildews Conference(第13届国际禾谷类锈病与白粉病大会)

作者： Roger WISE Priyanka SURANA Greg FUERST Ruo XU Divya MISTRY Julie DICKERSON Dan NETTLETON Department of Statistics Iowa State UniversityAmesIowa 50011 Department of Plant Pathology and Microbiology Center for Plant Responses to Environmental StressesIowa State UniversityAmesIowa 50011 Department of StatisticsIowa State UniversityAmesIowa 50011 Bioinformatics and Computational Biology Graduate ProgramIowa State UniversityAmesIowa 50011 Department of Electrical and Computer Engineering Iowa State UniversityAmesIowa 50011USA Bioinformatics and Computational Biology Graduate ProgramIowa State UniversityAmesIowa 50011 Bioinformatics and Computational Biology Graduate Program Iowa State UniversityAmesIowa 50011 Department of Plant Pathology and MicrobiologyCenter for Plant Responses to Environmental StressesIowa State UniversityAmesIowa 50011 Department of Plant Pathology and Microbiology Center for Plant Responses to Environmental StressesIowa State UniversityAmesIowa 50011 Bioinformatics and Computational Biology Graduate Program Iowa State UniversityAmesIowa 50011 Crop and Insect GeneticsGenomicsand Informatics Research UnitU.S.Department of Agriculture-Agricultural Research ServiceIowa State UniversityAmesIowa 50011 Crop and Insect Genetics Genomicsand Informatics Research UnitU.S.Department of Agriculture-Agricultural Research ServiceIowa State UniversityAmesIowa 50011

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Capacitance Humidity Sensor

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MRS Online Proceedings Library 2011年第1期382卷 469-475页

作者： Andrew R. K. Ralston Paul E. Thoma Carl F. Klein Denice D. Denton Materials Science Program Department of Electrical and Computer Engineering and Department of Chemistry University of Wisconsin-Madison Madison USA Central Research Johnson Controls Inc. Milwaukee USA

A capacitance relative humidity (RH) sensor is described that has a design, construction, and material composition that result in an inexpensive and robust sensor. This sensor has a multilayer, free-standing film construction. It consists of a humidity sensitive polyimide (PI) dielectric core and conductive layers consisting of carbon filled polysulfone on each side of the polyirnide film to form a capacitor. The polyimide used is a BPDA-ODA type, and replaces a PMDA-ODA type polyimide used in a previous version of this sensor. The BPDA-ODA sensor has a nominal capacitance of 200 pF and a nominal sensitivity of 13% at 100% RH. The characteristics of this humidity sensor are discussed and compared to the characteristics of the PMDA-ODA type sensor. Characteristics considered include the PI film moisture uptake and water vapor transmission, and the sensors’ sensitivity to relative humidity, frequency response, and aging at 85°C/85% RH. The dual-state sorption model and free volume calculations are used to demonstrate that observed differences in the film are due to differences in chemical composition between the films.

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QUANTITATIVE ANALYSIS OF MRI-MEASURED WATER MOBILITY INCREASES IN RESPONSE TO CHEMOTHERAPY VIA MULTIPLE CELL-DEATH MECHANISMS

QUANTITATIVE ANALYSIS OF MRI-MEASURED WATER MOBILITY INCREAS...

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第十三届国际体视学大会

作者： Will G Xia David Morse Robert J Gillies Bioengineering Program Department of Electrical Engineering and Computer Science University of Arizona Cancer Center Tueson AZ 85724USA

Numerous pre-clinical and clinical reports have demonstrated that the MRI-measured apparent diffusion coefficient of water(ADC) increases early in the response to a wide variety of anti-cancer *** has been proposed that this increase in ADC generally results from an increase in the tumor extracellular volume fraction leading to a greater degree of unrestricted water ***,an increase in extracellular volume has been ascribed to the cell shrinkage that occurs early in the process of program.ed cell ***,other modes of death can be initiated soon after beginning *** other modes of death include mitotic catastrophe and necrosis,and may also involve changes in the fraction of water with unrestricted *** work quantitatively examines whether MRI-measured ADC is altered in response to therapies that induce cell death via non-apoptotic mechanisms and correlates ADC changes with cell death modalities regionally within the *** morphometric analysis show apoptotic responses were limited to the tumor periphery in apoptosis-proficient *** was not observed in deficient *** catastrophe was observed after treatment at the periphery and deeper into the *** was the predominant response in the center of the *** changes were moderate in the periphery and larger in the *** results indicate that early and significant changes in ADC can occur in concert with mitotic catastrophe and lytic necrosis in the absence of ***,changes in ADC may be a generalized measure of cytotoxic response to chemotherapy.

关键词： diffusion MRI imaging morphometry cell death

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Characteristics of step-graded InxGa1-xAs and InGaPySb1-y metamorphic buffer layers on GaAs substrates

Characteristics of step-graded InxGa1-xAs and InGaPySb1-y me...

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作者： Kirch, J. Dudley, P. Kim, T. Radavich, K. Ruder, S. Mawst, L.J. Kuech, T.F. Lalumondiere, S.D. Sin, Y. Lotshaw, W.T. Moss, S.C. Department of Electrical and Computer Engineering University of Wisconsin - Madison 1415 Engineering Dr. Madison WI 53706 United States Materials Science Program University of Wisconsin - Madison 1415 Engineering Dr. Madison WI 53706 United States Department of Chemical and Biological Engineering University of Wisconsin - Madison 1415 Engineering Dr. Madison WI 53706 United States Aerospace Corporation Electronics and Photonics Lab El Segundo CA 90245 United States

ISBN: (纸本)9781457717536

Step-graded InGaPySb1-y and InxGa 1-xAs metamorphic buffer layer (MBL) structures are grown on GaAs substrates by metal-organic chemical vapor deposition (MOCVD). AFM analysis indicates that graded group V InGaPySb1-y MBLs exhibit significantly lower surface roughness (∼4.7nm) compared with more conventional graded group III InxGa1-xAs MBLs, which typically have rms surface roughness in the range of 7- 14nm. To reduce the surface roughness of the InxGa1-xAs MBL, a post growth Chemical-Mechanical Polishing (CMP) procedure is implemented. AFM image analysis indicates the CMP process is effective in reducing the step-graded In xGa1-xAs MBL surface roughness from ∼7.3 nm (as-grown) to 2.3 nm post CMP. Preliminary studies indicate that bulk InGaAs layers regrown on top of the MBL subjected to CMP exhibit improved static and transient PL characteristics compared with those deposited on as-grown MBLs. © VDE VERLAG GMBH.

关键词： III-V semiconductors

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Microfluidic actuators based on infrared-light responsive PNIPAAm hydrogel nanocomposite incorporating graphene-oxide

Microfluidic actuators based on infrared-light responsive PN...

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International Solid-State Sensors, Actuators and Microsystems Conference

作者： Lo, Chi-Wei Zhu, Difeng Jiang, Hongrui Materials Science Program University of Wisconsin-Madison WI 53706 United States Department of Electrical and Computer Engineering University of Wisconsin-Madison WI 53706 United States Eye Research Institute University of Wisconsin Madison Madison WI 53706 United States

ISBN: (纸本)9781457701573

In lab-on-a-chip systems, microactuators are critical to control the flow within the microchannels. Most of the current actuators require hardware connection (electromagnetic, thermopneumatic actuators, etc.) within the channels, thus significantly increasing the system complexity. Remotely controllable actuators would greatly simplify the system. We demonstrate nanocomposite microfluidic actuators remotely controlled by infrared (IR) light. These actuators are fabricated out of thermo-responsive poly-N- isopropylacrylamide (PNIPAAm) nanocomposite hydrogels incorporated with glycidyl methacylate functionalized graphene-oxide (GO-GMA). Two example devices were realized implementing such actuators: a microvalve and a tunable liquid microlens. © 2011 IEEE.

关键词： Hydrogels

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EEG Analysis for Estimation of Duration and Inter-Event Intervals of Seizure-Like Events Recorded in vivo From Mice

EEG Analysis for Estimation of Duration and Inter-Event Inte...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： Sinisa Colic Rob Wither James H. Eubanks Liang Zhang Berj L. Bardakjian Department of Electrical and Computer Engineering University of Toronto Department of Physiology University of Toronto Division of Genetics and Development Department of Surgery and University of Toronto Epilepsy Research Program University of Toronto Division of Fundamental Neurology Department of Medicine and University of Toronto Epilepsy Research Program University of Toronto Department of Electrical and Computer Engineering and Institute of Biomaterials and Biomedical Engineering University of Toronto

ISBN: (纸本)9781424441211

Rett syndrome is a neurodevelopmental disorder of the brain that affects females more often than males. Its cause is linked to the mutations within the gene encoding methyl CpG-binding protein 2 (MeCP2). Presently, there is little information regarding how the loss of MeCP2 affects brain activity. It has been documented that during awake but immobile state, the MeCP2 deficient mice exhibit spontaneous, rhythmic electroencephalogram (EEG) seizure-like events (SLEs) in the range of 6-9 Hz. In this study, we analyze the cortical EEG activity in female MeCP2-deficient mice over 24 hour recordings. Characterizing the SLE and inter-SLE durations by fitting to a gamma distribution we show similarity to previous in vivo epilepsy studies. These results suggest that the SLE and inter-SLE dynamics differ. More precisely, the SLE terminations appear to be a result of time-dependent mechanisms, whereas the inter-SLEs are a result of a random process.

关键词： Methyl-CpG-Binding Protein 2 Electroencephalography Systemic Lupus Erythematosus Gamma Distribution Mus Seizures Neurodevelopmental Disorders Stochastic Processes Brain Diseases Rett Syndrome awake Mouse brain activity CXXC1 gene

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Low-Frequency Noise in “Graphene-Like” Exfoliated Thin Films of Topological Insulators

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MRS Online Proceedings Library 2011年第1期1344卷 1-5页

作者： M. Z. Hossain S. L. Rumyantsev K. M. F. Shahil D. Teweldebrhan M. Shur A. A. Balandin Nano-Device Laboratory Department of Electrical Engineering and Materials Science and Engineering Program University of California Riverside USA Department of Electrical Computer and Systems Engineering and Center for Integrated Electronics Rensselaer Polytechnic Institute Troy USA Ioffe Institute Russian Academy of Sciences St. Petersburg Russia

We report results of the study of the low-frequency noise in thin films of bismuth selenide topological insulators, which were mechanically exfoliated from bulk crystals via “graphene-like” procedures. From the resistance dependence on the film thickness, it was established that the surface conduction contributions to electron transport were dominant. It was found that the current fluctuations have the noise spectral density SI ∞ 1/ f (where f is the frequency) for the frequency range up to 10 kHz. The obtained noise data are important for transport experiments with topological insulators and for any proposed device applications of these materials.

关键词： devices electrical properties thin film

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