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Inquiry-learning with WebLab: Undergraduate attitudes and experiences

Journal of science Education and Technology 2007年第4期16卷 337-348页

作者： Fischer, Judith mitchell, Rudolph Del Alamo, Jesus Teaching and Learning Laboratory MIT Building 5-122 Cambridge MA 02139 77 Massachusetts Ave United States Department of Electrical Engineering and Computer Science MIT Cambridge MA United States

The Microelectronics WebLab at mit allows students to do actual (not simulated) laboratory research on state-of-the art equipment through the Internet. This study assesses the use of WebLab in a junior-level course on microelectronic devices and circuits in 2004-05 and 2005-06. In quantitative surveys and qualitative interviews, students and faculty reported that WebLab was effective as an instrument of learning, and grew more so with refinements of the program. WebLab allowed undergraduates to learn at their own pace and on their own schedules. It enabled them to use different processes of learning (intuitive, visual, abstract), and it gave them an opportunity to link individual and collaborative effort in creative combinations. Online laboratories on this model have broad applications in the experimental sciences and in other research-oriented disciplines. © 2007 Springer science+Business Media, LLC.

关键词： Assessment engineering education Inquiry learning Microelectronics Online laboratories WebLab

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Molecular beam epitaxial growth of indium antimonide and its characterization

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Journal of Vacuum science and Technology B: Microelectronics and Nanometer Structures 2007年第1期25卷 11-16页

作者： Pham, H.T. Yoon, S.F. Boning, D. Wicaksono, S. Singapore-MIT Alliance 50 Nanyang Avenue Singapore 639798 Singapore School of Electrical and Electronic Engineering Nanyang Technological University Nanyang Avenue Singapore 639798 Singapore Department of Electrical and Electronic Engineering and Computer Science Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139-4307

Indium antimonide (InSb) is a promising material for mid- and long-wavelength infrared device applications. However, because of material's small band gap and low melting point, reproducibility of high quality epitaxial InSb is difficult to obtain. This article reports growth experimentations for determining suitable conditions for growing InSb on InSb(100) substrate using solid source molecular beam epitaxy. The effects of growth temperature and antimony/indium (SbIn) flux ratio on epilayer structure, surface roughness, and electronic properties were investigated. The process of oxide desorption observed from reflection high energy electron diffraction pattern is reported. A three-layer model was used to extract the electronic properties of the epilayer, taking into account the effect of parallel conduction. Process conditions for good structural and electronic properties of the InSb epilayer, which includes substrate temperature and flux ratio, have been established in this study and reported herein. © 2007 American Vacuum Society.

关键词： Semiconducting indium compounds

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Nanoparticle-based cancer biomarker sensor

Nanoparticle-based cancer biomarker sensor

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2007 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2007

作者： Kim, G.Y. Daniel, K.D. Vassiliou, C.C. Elman, N.M. Josephson, L. Cima, M.J. Harvard-MIT Health Sciences and Technology Cambridge MA Dept of Chemical Engineering MIT Cambridge MA Dept of Electrical Eng and Computer Sci. MIT Cambridge MA Dept of Materials Science and Engineering MIT Cambridge MA Center for Molecular Imaging MGH Charlestown MA

ISBN: (纸本)1420061836

Magnetic relaxation switches (MRS) are being developed for local monitoring of cancer biomarkers. MRS are functionalized magnetic iron oxide nanoparticles that exhibit analyte-induced aggregation and a corresponding change in transverse spin-spin relaxation time (T2), which can be measured though NMR spectroscopy or MRI. MRS were functionalized with a matched pair of antibodies to detect the beta subunit of human chorionic gonadotrophin (hCG), which is elevated in testicular and ovarian cancers. These MRS have been shown to aggregate specifically in the presence of the hCG-β and hCG in a concentration dependent manner as confirmed by T2 changes and particle sizing measurements. Here, we report further characterization of this sensor system. The aggregates were found to dissociate with the addition of large excesses of hCG as governed by the dissociation constant of the antibodies. The effect of valency on the formation of aggregates was also studied.

关键词： Biosensors

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Highly efficient resonance energy transfer in ultrathin organic-inorganic semiconductor hybrid films

Highly efficient resonance energy transfer in ultrathin orga...

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Conference on Lasers and Electro-Optics, CLEO 2007

作者： Zhang, Qiang Atay, Tolga Nurmikko, Arto Tischler, Jonathan Bradley, Scott Bulovic, Vladimir Division of Engineering Department of Physics Brown University Providence RI 02912 United States Department of Electrical Engineering and Computer Science MIT Cambridge MA 02139 United States

We report on the optical study of efficient excitation transfer in organic-inorganic hybrid thin films composed of alternating monolayers of CdSe/ZnS QDs and J-aggregate of cyanine dyes, by steady-state and time-resol... 详细信息

ISBN: (纸本)1557528349

关键词： Energy transfer

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Time to Contact Relative to a Planar Surface

Time to Contact Relative to a Planar Surface

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IEEE Symposium on Intelligent Vehicle

作者： Berthold K.P. Horn Yajun Fang Ichiro Masaki Department of Electrical Engineering and Computer Science and CSAIL MIT Cambridge MA USA Department of Electrical Engineering and Computer Science MIT Cambridge MA USA Department of Electrical Engineering and Computer Science MTL MIT Cambridge MA USA

We show how to determine the time to contact from time varying images using only accumulated sums of suitable products of image brightness derivatives. There is no need for feature or object detection, tracking of features, estimation of optical flow, or any "higher level" processing. This so-called "direct" method for determining the time to contact is based on analysis of the motion field resulting from rigid body motion under perspective projection and the constant brightness assumption. The method has essentially no latency, since it can be based on analysis of just two frames of a video sequence, and does not require a calibrated camera. An implementation of the method is demonstrated on synthetic image sequences and stop motion sequences - where the ground truth is accurately know - as well as on video sequences taken by a camera mounted on moving vehicles.

关键词： Brightness computer vision Image motion analysis Motion analysis Video sequences Cameras Object detection Delay Image sequence analysis Image sequences

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Transient Noise Analysis for Comparator-Based Switched-Capacitor Circuits

Transient Noise Analysis for Comparator-Based Switched-Capac...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Albert Chow Hae-Seung Lee Electrical Engineering and Computer Science MIT Cambridge USA

This work investigates the analysis of transient noise in non steady-state systems such as comparator-based switched-capacitor circuits. It expands the impulse sensitivity method previously applied to oscillator noise analysis to general linear time varying systems. The method described here uses simulation techniques to obtain the noise transfer function. This provides a useful tool for circuit design because it allows for the precision and ease of simulation without sacrificing the intuition of hand calculations.

关键词： Transient analysis Circuit noise Switched capacitor circuits Time varying systems Steady-state Circuit simulation Transfer functions computer science Oscillators Computational modeling

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A fully integrated microfabricated externally wetted electrospray thruster

A fully integrated microfabricated externally wetted electro...

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43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference

作者： Gassend, B. Velásquez-García, L.F. Akinwande, A.I. Martínez-Sánchez, M. Massachusetts Institute of Technology Cambridge MA 02139 United States MIT Department of Electrical Engineering and Computer Science 32 Vassar Street Cambridge MA 02139 AIAA MIT Department of Aeronautics and Astronautics and Microsystems Technology Laboratories 77 Massachusetts Avenue Cambridge MA 02139 Department of Electrical Engineering and Computer Science 77 Massachusetts Avenue Cambridge MA 02139 Department of Aeronautics and Astronautics 77 Massachusetts Avenue Cambridge MA 02139

ISBN: (纸本)1563479036

This paper reports the performance of a fully-integrated planar electrospray thruster array. Electrospray thrusters work by electrostatically extracting and accelerating ions or charged droplets from a liquid surface to produce thrust. Emission occurs from sharp emitter tips, which enhance the electric field and constrain the emission location. Electrospray propulsion is desirable for its simplicity, high thrust efficiency and tunable specific impulse. However, the electrospray process limits the thrust from a single tip, so that achieving millinewton thrust levels would require an array with tens of thousands of emitters. We have used silicon batch microfabrication technology to make an array of 502 emitters in a 113 mm2 area. The thruster, weighing 5 g, was tested with the ionic liquid EMI-BF4. Time of night measurements show that the thruster operates in the ion-emission regime, which is most efficient for propulsion, with a specific impulse around 3000 s at a 1 kV extractor voltage. Emission starts as low as 500 V. Currents of 370 nA per emitter have been recorded at 1500 V, for an estimated thrust of 26 nN per emitter or 13 μN total, and a 275 mW power consumption. The thrust efficiency is estimated around 85%. In good operating conditions, the current intercepted on the extractor electrode is well below 1%, increasing to a few percent at the highest current levels.

关键词： Electric propulsion

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Highly Efficient Resonance Energy Transfer in Ultrathin Organic-Inorganic Semiconductor Hybrid Films

Highly Efficient Resonance Energy Transfer in Ultrathin Orga...

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Conference on Lasers & Electro-Optics & Quantum Electronics and Laser science Conference

作者： Qiang Zhang Tolga Atay Arto Nurmikko Jonathan Tischler Scott Bradley Vladimir Bulovic Division of Engineering and Department of Physics Brown University Department of Electrical Engineering and Computer Science MIT

ISBN: (纸本)9781424435906

关键词： Energy transfer Spectroscopy Fluorescence and luminescence

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Correction to “Did tsunami-launched gravity waves trigger ionospheric turbulence over Arecibo?”

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Journal of Geophysical Research: Space Physics 2008年第A3期113卷

作者： M. C. Lee R. Pradipta W. J. Burke A. Labno L. M. Burton J. A. Cohen S. E. Dorfman A. J. Coster M. P. Sulzer S. P. Kuo Department of Electrical and Computer Engineering Boston University Boston Massachusetts USA Plasma Science and Fusion Center Massachusetts Institute of Technology Cambridge Massachusetts USA Air Force Research Laboratory Hanscom Air Force Base Massachusetts USA MIT Haystack Observatory Westford Massachusetts USA Arecibo Observatory Arecibo Puerto Rico USA Polytechnic University Brooklyn New York USA

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Real-Time Development of Patient-Specific Alarm Algorithms for Critical Care

Real-Time Development of Patient-Specific Alarm Algorithms f...

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29th Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBS 2007), vol.11

作者： Ying Zhang MIT Division of Health Sciences and Technology and MIT Department of Electrical Engineering and Computer Science Harvard Medical School Cambridge MA USA

The state-of-the-art monitoring systems for critical care measure vital signs and generate alerts based on the logic of general patient population models, but they lack the capabilities of accurately correlating physiological data with clinical events and of adapting to individual patient's characteristics that do not fit the population models. This research examines the feasibility of developing patient-specific alarm algorithms in real time at the bedside and evaluates the potential of these algorithms in helping improve patient monitoring. Modular components that facilitate real-time development of alarm algorithms were added to a system that simultaneously collects physiological data and clinical annotations at the bedside. At a pediatric intensive care unit (ICU), classification trees and neural networks for generating clinical alarms were trained for individual patients. These algorithms were evaluated immediately after training on subsequently collected data. The implemented system was capable of training and evaluating patient-specific algorithms in a consistent manner in real time at the bedside. The performance of patient-specific alarm algorithms improved as training data increased. Neural networks with eight hours of training data on average achieved a sensitivity of 0.96, a specificity of 0.99, a positive predictive value of 0.79, and an accuracy of 0.99;these figures were 0.84, 0.98, 0.72, and 0.98 respectively for the classification trees. These results suggest that real-time development of patient-specific alarm algorithms is feasible using machine learning techniques. The patient-specific alarm algorithms developed in this study outperformed the bedside monitors from a decade ago and came close in performance to the new generation of monitors.

关键词： Patient monitoring Biomedical monitoring Real time systems Classification tree analysis Neural networks Training data Machine learning algorithms Character generation Logic Machine learning

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