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Browsing MIT Open Access Articles by Title

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  • The Spectrum of Goldstini and Modulini 
    Cheung, Clifford; D'Eramo, Francesco; Thaler, Jesse (Springer-Verlag, 2011-08)
    When supersymmetry is broken in multiple sectors via independent dynamics, the theory furnishes a corresponding multiplicity of “goldstini” degrees of freedom which may play a substantial role in collider phenomenology and ...
  • Spectrum of the Cavity-QED Microlaser: Strong Coupling Effects in the Frequency Pulling at Off Resonance 
    Dasari, Ramachandra Rao; Hong, H. -G.; Seo, W.; Song, Y.; Lee, M.; Jeong, H.; Shin, Y.; Choi, W.; An, K. (American Physical Society, 2012-12)
    We report the first experimental observation of the cavity-QED microlaser spectrum, specifically the unconventional frequency pulling brought by a strong atom-cavity coupling at off resonance. The pulling is enhanced ...
  • Spectrum resolved fluorescence imaging in multi-focal volume holographic microscopy 
    Luo, Yuan; Zervantonakis, Ioannis; Oh, Se Baek; Kamm, Roger Dale; Barbastathis, George (SPIE, 2011)
    A real-time three dimensional (3D) fluorescence imaging system incorporating wavelength-coded and multiplexed holographic gratings is presented. Holographic gratings formed in thick Phenanthrenquinone- (PQ-) Doped Poly ...
  • A speech locked loop for cochlear implants and speech prostheses 
    Wee, Keng Hoong; Turicchia, Lorenzo; Sarpeshkar, Rahul (Institute of Electrical and Electronics Engineers (IEEE), 2010-11)
    We have previously described a feedback loop that combines an auditory processor with a low-power analog integrated-circuit vocal tract to create a speech-locked-loop. Here, we describe how the speech-locked loop can help ...
  • Speech rhythm guided syllable nuclei detection 
    Glass, James R.; Zhang, Yaodong, Ph. D. Massachusetts Institute of Technology (Institute of Electrical and Electronics Engineers, 2009-04)
    In this paper, we present a novel speech-rhythm-guided syllable-nuclei location detection algorithm. As a departure from conventional methods, we introduce an instantaneous speech rhythm estimator to predict possible regions ...
  • Speeding Multicast by Acknowledgment Reduction Technique (SMART) 
    Rezaee, Arman; Zeger, Linda; Medard, Muriel (Institute of Electrical and Electronics Engineers (IEEE), 2011-12)
    We present a novel feedback protocol for wireless broadcast networks that utilize linear network coding. We consider transmission of packets from one source to many receivers over a single-hop broadcast erasure channel. ...
  • SpeX Spectroscopy of Unresolved Very Low-Mass Binaries. I. Identification of Seventeen Candidate Binaries Straddling the L Dwarf/T Dwarf Transition 
    Burgasser, Adam J.; Cruz, Kelle L.; Cushing, Michael; Gelino, Christopher R.; Looper, Dagny L.; Faherty, Jacqueline K.; Kirkpatrick, J. Davy; Reid, I. Neill (American Astronomical Society, 2010-01)
    We report the identification of 17 candidate brown dwarf binaries whose components straddle the L dwarf/T dwarf transition. These sources were culled from a large near-infrared spectral sample of L and T dwarfs observed ...
  • Spherical cloaking with homogeneous isotropic multilayered structures 
    Qiu, Cheng-Wei; Hu, Li; Xu, Xiaofei; Feng, Yijun (American Physical Society, 2009-04)
    We propose a practical realization of electromagnetic spherical cloaking by layered structure of homogeneous isotropic materials. By mimicking the classic anisotropic cloak by many alternating thin layers of isotropic ...
  • Spherical Demons: Fast Diffeomorphic Landmark-Free Surface Registration 
    Yeo, Boon Thye Thomas; Golland, Polina; Sabuncu, Mert R.; Fischl, Bruce; Vercauteren, Tom; Ayache, Nicholas (Institute of Electrical and Electronics Engineers, 2010-03)
    We present the Spherical Demons algorithm for registering two spherical images. By exploiting spherical vector spline interpolation theory, we show that a large class of regularizors for the modified Demons objective ...
  • Spherical probes at ion saturation in E ∧ B fields 
    Hutchinson, Ian H.; Patacchini, Leonardo (Institute of Physics (Great Britain), 2010-02)
    The ion saturation current to a spherical probe in the entire range of ion magnetization is computed with SCEPTIC3D, a newthree-dimensional version of the kinetic code SCEPTIC designed to study transverse plasma flows. ...
  • The Spider Effect: Morphological and Orienting Classification of Microglia in Response to Stimuli in Vivo 
    Jonas, Rahul A.; Yuan, Ti-Fei; Liang, Yu-Xiang; Jonas, Jost B.; Tay, David K. C.; Ellis-Behnke, Rutledge (Public Library of Science, 2012-02)
    The different morphological stages of microglial activation have not yet been described in detail. We transected the olfactory bulb of rats and examined the activation of the microglial system histologically. Six stages ...
  • Spin and valence states of iron in (Mg[subscript 0.8]Fe[subscript 0.2])SiO[subscript 3] perovskite 
    Grocholski, Brent; Shim, Sang-Heon Dan; Sturhahn, W.; Zhao, J.; Xiao, Y.; Chow, P. C. (American Geophysical Union, 2009-12)
    The spin and valence states of iron in (Mg0.8Fe0.2)SiO3 perovskite were measured between 0 and 65 GPa using synchrotron Mössbauer spectroscopy. Samples were synthesized in situ in the laser-heated diamond cell under reducing ...
  • Spin-bath narrowing with adaptive parameter estimation 
    Cappellaro, Paola (American Physical Society, 2012-03)
    We present a measurement scheme capable of achieving the quantum limit of parameter estimation using an adaptive strategy that minimizes the parameter's variance at each step. The adaptive rule we propose makes the scheme ...
  • Spin Gradient Demagnetization Cooling of Ultracold Atoms 
    Medley, Patrick M.; Weld, David M.; Miyake, Hirokazu; Pritchard, David E.; Ketterle, Wolfgang (American Physical Society, 2011-05)
    We demonstrate a new cooling method in which a time-varying magnetic field gradient is applied to an ultracold spin mixture. This enables preparation of isolated spin distributions at positive and negative effective spin ...
  • Spin Gradient Thermometry for Ultracold Atoms in Optical Lattices 
    Weld, David M.; Medley, Patrick M.; Miyake, Hirokazu; Hucul, David; Pritchard, David E.; Ketterle, Wolfgang (American Physical Society, 2009-12)
    We demonstrate spin gradient thermometry, a new general method of measuring the temperature of ultracold atoms in optical lattices. We realize a mixture of spins separated by a magnetic field gradient. Measurement of the ...
  • Spin-Injection Spectroscopy of a Spin-Orbit Coupled Fermi Gas 
    Cheuk, Lawrence W.; Sommer, Ariel Tjodolv; Hadzibabic, Zoran; Yefsah, Tarik; Bakr, Waseem S.; Zwierlein, Martin Wolfram (American Physical Society, 2012-08)
    The coupling of the spin of electrons to their motional state lies at the heart of recently discovered topological phases of matter. Here we create and detect spin-orbit coupling in an atomic Fermi gas, a highly controllable ...
  • Spin Liquid Phases for Spin-1 Systems on the Triangular Lattice 
    Xu, Cenke; Qi, Yang; Balents, Leon; Fisher, Matthew P. A.; Wang, Fa (American Physical Society, 2012-02)
    Motivated by recent experiments on material Ba3NiSb2O9, we propose two novel spin liquid phases (A and B) for spin-1 systems on a triangular lattice. At the mean field level, both spin liquid phases have gapless fermionic ...
  • Spinodal decomposition in particle-laden Landau-Levich flow 
    Kao, Justin C. T.; Hosoi, Anette E. (American Institute of Physics (AIP), 2012-04)
    We examine Landau-Levich coating by a suspension of spherical particles. For particles larger than the liquid film thickness, capillary forces lead to self-assembly of monolayer particle aggregates. We observe two regimes ...
  • A spin on cavity formation during water entry of hydrophobic and hydrophilic spheres 
    Truscott, Tadd T.; Techet, Alexandra H. (American Institute of Physics, 2009-12)
    Surface coating and impact velocity can dramatically affect cavity formation during water entry of spheres. Duez et al. [Nat. Phys. 3, 180 (2007) ] present a theoretical limit, dependent on impact velocity and surface ...
  • Spinon Phonon Interaction and Ultrasonic Attenuation in Quantum Spin Liquids 
    Zhou, Yi; Lee, Patrick A. (American Physical Society, 2011-02)
    Several experimental candidates for quantum spin liquids have been discovered in the past few years which appear to support gapless fermionic S=1/2 excitations called spinons. The spinons may form a Fermi sea coupled to a ...
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