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Browsing MIT Open Access Articles by Title

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  • Weichenberg, Guy Elli; Chan, Vincent W. S.; Medard, Muriel (Institute of Electrical and Electronics Engineers (IEEE), 2009-07)
    In our previous work [Chan, “Optical flow switching,” in BROADNETS 2006, pp. 1-8; Weichenberg, “Cost-efficient optical network architectures,” in ECOC 2006, pp. 1-2; Weichenberg, “On the throughput-cost tradeoff of ...
  • Tang, Sai Chun; Otten, David M.; Keim, Thomas A.; Perreault, David J. (Institute of Electrical and Electronics Engineers (IEEE), 2010-11)
    This paper presents techniques for the design of high-power Lundell alternators with integrated switched-mode rectifiers. A multisection stator winding and interleaved rectifier arrangement is introduced that enables high ...
  • Perreault, David J.; Kassakian, John G. (Institute of Electrical and Electronics Engineers (IEEE), 1999-06)
    This paper presents the design and experimental evaluation of a six-cell 6 kW cellular (parallel) rectifier system which operates at nearly unity power factor. The cellular rectifier system implements both distributed load ...
  • Chow, Albert C.; Perreault, David J. (Institute of Electrical and Electronics Engineers (IEEE), 2003-04)
    Active ripple filters can substantially attenuate power converter ripple, allowing considerable reduction in passive filter component size. Investigated here is a hybrid passive/active filter topology that achieves ripple ...
  • Park, Barratt; Steeves, Adam H.; Kuyanov, Kirill; Neill, Justin L.; Field, Robert W. (American Institute of Physics (AIP), 2011-07)
    Chirped-pulse millimeter-wave (CPmmW) spectroscopy is the first broadband (multi-GHz in each shot) Fourier-transform technique for high-resolution survey spectroscopy in the millimeter-wave region. The design is based on ...
  • Perreault, David J.; Kassakian, John G.; Zhu, Mingjuan; Caliskan, Vahe; Neugebauer, Timothy C.; Guttowski, Stephan (Institute of Electrical and Electronics Engineers (IEEE), 2005-03)
    An active ripple filter is an electronic circuit that cancels or suppresses the ripple current and electromagnetic interference generated by the power stage of a power converter, thus reducing the passive filtration ...
  • Parlikar, T.A.; Chang, W.S.; Qiu, Y.H.; Seeman, M.D.; Perreault, David J.; Kassakian, John G.; Keim, Thomas A. (Institute of Electrical and Electronics Engineers (IEEE), 2005-10)
    In conventional internal combustion engines, engine valve displacements are fixed relative to crankshaft position. If these valves were actuated as a variable function of crankshaft angle, significant improvements in fuel ...
  • Gassend, Blaise Laurent Patrick; Velasquez-Garcia, Luis Fernando; Akinwande, Akintunde Ibitayo (Institute of Electrical and Electronics Engineers, 2010-06)
    This paper reports the design and fabrication of high-aspect-ratio needlelike silicon structures that can have complex geometry. The structures are hundreds of micrometers tall with submicrometer-sharp protrusions, and ...
  • Sheng, Xing; Broderick, Lirong Z.; Hu, Juejun; Yang, Li; Eshed, Anat; Fitzgerald, Eugene A.; Michel, Jurgen; Kimerling, Lionel C. (Optical Society of America, 2011-05)
    We developed a high-index-contrast photonic structure for improving the light extraction efficiency of light-emitting diodes (LEDs) by a self-assembly approach. In this approach, a two-dimensional grating can be ...
  • Chester, David A.; Bermel, Peter A.; Joannopoulos, John D.; Soljacic, Marin; Celanovic, Ivan (Optical Society of America, 2011-03)
    Solar thermal, thermoelectric, and thermophotovoltaic (TPV) systems have high maximum theoretical efficiencies; experimental systems fall short because of losses by selective solar absorbers and TPV selective emitters. To ...
  • Bermel, Peter A.; Ghebrebrhan, Michael; Chan, Walker; Yeng, YiXiang; Araghchini, Mohammad; Hamam, Rafif E.; Marton, Christopher Henry; Jensen, Klavs F.; Soljacic, Marin; Joannopoulos, John D.; Johnson, Steven G.; Celanovic, Ivan (Optical Society of America, 2010-08)
    Despite their great promise, small experimental thermophotovoltaic (TPV) systems at 1000 K generally exhibit extremely low power conversion efficiencies (approximately 1%), due to heat losses such as thermal emission of ...
  • Timko, Brian P.; Cohen-Karni, Tzahi; Qing, Quan; Tian, Bozhi; Lieber, Charles M. (Institute of Electrical and Electronics Engineers, 2010-05)
    Nanowire FETs (NWFETs) are promising building blocks for nanoscale bioelectronic interfaces with cells and tissue since they are known to exhibit exquisite sensitivity in the context of chemical and biological detection, ...
  • Lee, Howon; Fang, Nicholas Xuanlai; Zheng, Xiaoyu; Deotte, Joshua; Alonso, Matthew P.; Farquar, George R.; Weisgraber, Todd H.; Gemberling, Steven; Spadaccini, Christopher M. (American Institute of Physics (AIP), 2012-12)
    The rapid manufacture of complex three-dimensional micro-scale components has eluded researchers for decades. Several additive manufacturing options have been limited by either speed or the ability to fabricate true ...
  • Celanovic, Ivan; Ilak, Milos; O'Sullivan, Francis Martin; Kassakian, John G.; Perreault, David J. (Optical Society of America, 2004-04)
    We explore the optical characteristics and fundamental limitations of one-dimensional (1D) photonic crystal (PhC) structures as means for improving the efficiency and power density of thermophotovoltaic (TPV) and ...
  • Fu, Haitao; Yeo, Kiat-Seng; Do, Anh-Tuan; Kong, Zhi-Hui (Institute of Electrical and Electronics Engineers, 2010-02)
    The SRAM which functions as the cache for system-on-chip is vital in the electronic industry. The heavy bit-and data-line capacitances are the major road blocks to its performance. A high-performance SRAM is proposed using ...
  • Li, Yang; Cao, Rui; Lippard, Stephen J. (American Chemical Society (ACS), 2011-08)
    A novel triptycene-based ligand with a preorganized framework was designed to model carboxylate-bridged diiron active sites in bacterial multicomponent monooxygenase (BMM) hydroxylase enzymes. The synthesis of the ...
  • Tax, David Samuel; Mastovsky, Ivan; Neilson, Jeff; Shapiro, Michael; Sirigiri, Jagadishwar R.; Temkin, Richard J.; Torrezan de Sousa, Antonio Carlos (Institute of Electrical and Electronics Engineers, 2009-11)
    We report experimental results on a 1.5 MW, 110 GHz, 3 microsecond pulsed gyrotron with a single-stage depressed collector. A simplified mode converter with smooth mirror surfaces has been installed in the tube. The converter ...
  • Choi, Hak Soo; Liu, Wenhao; Liu, Fangbing; Nasr, Khaled; Misra, Preeti; Bawendi, Moungi G.; Frangioni, John V. (Nature Publishing Group, 2009-11)
    Inorganic/organic hybrid nanoparticles are potentially useful in biomedicine, but to avoid non-specific background fluorescence and long-term toxicity, they need to be cleared from the body within a reasonable timescale1. ...
  • Davis, Joseph H.; Rubin, Adam J.; Sauer, Robert T. (Oxford University Press, 2010-09)
    We have generated a series of variable-strength, constitutive, bacterial promoters that act predictably in different sequence contexts, span two orders of magnitude in strength and contain convenient sites for cloning and ...
  • Drela, Mark (SAE International, 2011-10)
    The fuel energy consumption of subsonic air transportation is examined. The focus is on identification and quantification of fundamental engineering design tradeoffs which drive the design of subsonic tube and wing transport ...
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