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Browsing MIT Open Access Articles by Title

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  • Rahul, Hariharan Shankar; Edalat, Farinaz; Katabi, Dina; Sodini, Charles G. (Association for Computing Machinery (ACM), 2009-09)
    There has been burgeoning interest in wireless technologies that can use wider frequency spectrum. Technology advances, such as 802.11n and ultra-wideband (UWB), are pushing toward wider frequency bands. The analog-to-digital ...
  • Perreault, David J.; Selders, Robert L.; Kassakian, John G. (Institute of Electrical and Electronics Engineers (IEEE), 1998-07)
    A new current-sharing technique for paralleled power converters, which is based on frequency encoding of the current-sharing information, is introduced. The approach has significant advantages over existing methods, including ...
  • Tsai, Tsung-Han; Zhou, Chao; Adler, Desmond C.; Fujimoto, James G. (Optical Society of America, 2009-11)
    We demonstrate a frequency comb (FC) swept laser and a frequency comb Fourier domain mode locked (FC-FDML) laser for applications in optical coherence tomography (OCT). The fiber-based FC swept lasers operate at a sweep ...
  • Tsai, Tsung-Han; Zhou, Chao; Adler, Desmond C.; Fujimoto, James G. (SPIE, 2010-02)
    We demonstrate a frequency comb (FC) swept laser and a frequency comb Fourier domain mode locked (FC-FDML) laser for applications in optical coherence tomography (OCT). The fiber-based FC swept lasers operate at a sweep ...
  • Nguyen, Thanh T-H.; Mow-Lowry, Conor Malcolm; Slagmolen, Bram J. J.; Miller, John; Mullavey, Adam J.; Altin, Paul A.; Shaddock, Daniel A.; McClelland, David E.; Gossler, Stefan (American Physical Society, 2015-12)
    We present measurements of the frequency dependence of thermal noise in aluminum and niobium flexures. Our measurements cover the audio-frequency band from 10 Hz to 10 kHz, which is of particular relevance to ground-based ...
  • Dawson, Joel L.; Bohorquez, Jose L.; Chandrakasan, Anantha P. (Institute of Electrical and Electronics Engineers, 2009-12)
    Since its invention in 1922, the super-regenerative amplifier (SRA) has been used in a variety of short-range, low-power, and/or low-cost wireless systems due to its simple implementation and excellent performance for a ...
  • Degen, Christian; Poggio, M.; Oosterkamp, T. H.; Mamin, H. J.; Rugar, D. (American Institute of Physics, 2010-02)
    Frequency domain multiplexing, using an actively damped micromechanical cantilever, is used to detect multiple force signals simultaneously. The measurement principle is applied to magnetic resonance force microscopy to ...
  • Strazzo, Sarah; Elsner, James B.; Trepanier, Jill C.; Emanuel, Kerry Andrew (American Geophysical Union (AGU), 2013-07)
    Synthetic hurricane track data generated from a downscaling approach are compared to best-track (observed) data to analyze differences in regional frequency, intensity, and sensitivity of limiting intensity to sea surface ...
  • van Marrewijk, N.; Mirzaei, B.; Hayton, D.; Gao, J. R.; Kao, T. Y.; Reno, J. L.; Kao, Tsung-Yu; Hu, Qing (Springer US, 2015-10)
    We have performed frequency locking of a dual, forward reverse emitting third-order distributed feedback quantum cascade laser (QCL) at 3.5 THz. By using both directions of THz emission in combination with two gas cells ...
  • Ren, Y.; Hovenier, J. N.; Cui, M.; Hayton, D. J.; Gao, J. R.; Klapwijk, T. M.; Shi, S. C.; Kao, T.-Y.; Hu, Qing; Reno, J. L. (2011-04)
    We report a frequency locking experiment of a 3.5 THz third-order distributed feedback quantum cascade laser (QCL) by using a molecular absorption line of methanol (CH[subscript 3]OH) gas. With the help of the absorption ...
  • Ren, Y.; Hovenier, J. N.; Cui, M.; Hayton, D. J.; Gao, J. R.; Klapwijk, T. M.; Shi, S. C.; Reno, J. L.; Kao, Tsung-Yu; Hu, Qing (American Institute of Physics (AIP), 2012-01)
    We report frequency locking of two 3.5-THz third-order distributed feedback (DFB)quantum cascade lasers(QCLs) by using methanol molecular absorption lines, a proportional-integral-derivative controller, and a NbN bolometer. ...
  • Techapiesancharoenkij, Ratchatee; Kostamo, Jari; Allen, Samuel Miller; O'Handley, Robert C. (American Institute of Physics, 2009-05)
    A prototype of Ni–Mn–Ga based ferromagnetic-shape-memory-alloy (FSMA) actuator was designed and built; an acoustic-assist technique was applied to the actuator to enhance its performance. A piezoelectric stack actuator was ...
  • Rodriguez-Wong, Alejandro; Ilic, Ognjen; Bermel, Peter A.; Celanovic, Ivan; Joannopoulos, John D.; Soljacic, Marin; Johnson, Steven G. (American Physical Society (APS), 2011-09)
    We demonstrate the possibility of achieving enhanced frequency-selective near-field radiative heat transfer between patterned (photonic-crystal) slabs at designable frequencies and separations, exploiting a general numerical ...
  • Brincat, Scott Louis; Miller, Earl K. (Nature Publishing Group, 2015-02)
    Much of our knowledge of the world depends on learning associations (for example, face-name), for which the hippocampus (HPC) and prefrontal cortex (PFC) are critical. HPC-PFC interactions have rarely been studied in ...
  • Hu, Qing; Kumar, Sushil; Lee, Alan; Qin, Qi; Reno, John L. (Institute of Electrical and Electronics Engineers, 2009-04)
    We demonstrate a tunable terahertz quantum cascade laser using an abutted silicon lens and grating feedback. The device tunes discontinuously over 160 GHz with a center frequency of 4.4 THz.
  • Chen, Sidi; Spletter, Maria; Ni, Xiaochun; White, Kevin P.; Luo, Liqun; Long, Manyuan (Elsevier, 2012-02)
    The evolution of the brain and behavior are coupled puzzles. The genetic bases for brain evolution are widely debated, yet whether newly evolved genes impact the evolution of the brain and behavior is vaguely understood. ...
  • Lin, Michael F.; Jungreis, Irwin; Kellis, Manolis; Sabeti, Pardis C; Sealfon, Rachel S.; Wolf, Maxim Y. (BioMed Central, 2015-02)
    Background The increasing availability of sequence data for many viruses provides power to detect regions under unusual evolutionary constraint at a high resolution. One approach leverages the synonymous substitution rate ...
  • Bush, John W. M. (American Meteorological Society, 2009-04)
    A cold event at around 8200 calendar years BP and the release, at around that time, of a huge freshwater outburst from ice-dammed glacial Lake Agassiz have lent support to the idea that the flood triggered the cold event. ...
  • Ferreira, David; Marshall, John C (Springer Berlin Heidelberg, 2015-05)
    Conservation of water demands that meridional ocean and atmosphere freshwater transports (FWT) are of equal magnitude but opposite in direction. This suggests that the atmospheric FWT and its associated latent heat (LH) ...
  • Imperiali, Barbara; Socher, Elke Ricarda (Wiley Blackwell, 2012-12)
    The FRET-Capture approach exploits a bound solvatochromic fluorophore, 4-N,N-dimethylamino-1,8-naphthalimide, as a FRET donor in both inter- and intramolecular energy transfer. A unique feature of this method is the ...
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