Browsing FAS Scholarly Articles by Title
Now showing items 17268-17287 of 18296
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Ultrafast and Fault-Tolerant Quantum Communication across Long Distances
(American Physical Society (APS), 2014)Quantum repeaters (QRs) provide a way of enabling long distance quantum communication by establishing entangled qubits between remote locations. In this Letter, we investigate a new approach to QRs in which quantum information ... -
Ultrafast Evolution and Loss of CRISPRs Following a Host Shift in a Novel Wildlife Pathogen, Mycoplasma gallisepticum
(Public Library of Science, 2012)Measureable rates of genome evolution are well documented in human pathogens but are less well understood in bacterial pathogens in the wild, particularly during and after host switches. \(Mycoplasma\) \(gallisepticum\) ... -
Ultrafast N-H Vibrational Dynamics of Cyclic Doubly Hydrogen-Bonded Homo- and Heterodimers
(American Chemical Society (ACS), 2008)Hydrogen-bonded interfaces are essential structural elements in biology. Furthermore they can mediate electron transport by coupling the electron to proton transfer within the interface. The specific hydrogen-bonding ... -
Ultrafast Rabi flopping and coherent pulse propagation in a quantum cascade laser
(Nature Publishing Group, 2010)Pulse propagation phenomena are central to ultrashort pulse generation and amplification in lasers1–5. In the coherent regime, the phase relationship between the pulse and the material transition is preserved, allowing ... -
Ultrahigh energy cosmic rays from nonrelativistic quasar outflows
(American Physical Society (APS), 2017-03-07)It has been suggested that non-relativistic outflows from quasars can naturally account for the missing component of the extragalactic γ-ray background and explain the cumulative neutrino background through pion decay in ... -
Ultralong Dephasing Times in Solid-State Spin Ensembles via Quantum Control
(American Physical Society (APS), 2018-07-25)Quantum spin dephasing is caused by inhomogeneous coupling to the environment, with resulting limits to the measurement time and precision of spin-based sensors. The effects of spin dephasing can be especially pernicious ... -
Ultrasensitivity of an Adaptive Bacterial Motor
(Elsevier BV, 2013)The flagellar motor of Escherichia coli adapts to changes in the steady-state level of the chemotaxis response regulator, CheY-P, by adjusting the number of FliM molecules to which CheY-P binds. Previous measurements of ... -
Ultraslow Group Velocity and Enhanced Nonlinear Optical Effects in a Coherently Driven Hot Atomic Gas
(American Physical Society, 1999)We report the observation of small group velocities of order 90 m/s and large group delays of greater than 0.26 ms, in an optically dense hot rubidium gas (approximate to 360 K). Media of this kind yield strong nonlinear ... -
Ultraslow Light & Bose-Einstein Condensates: Two-way Control with Coherent Light & Atom Fields
(Optical Society of America, 2005)Ultraslow light has been used to form dramatic new nonlinear excitations in superfluid Bose-Einstein condensates of laser-cooled alkali atoms, and to create pulsed coherent matter waves. We describe these phenomena and a ... -
Ultrasmall silicon quantum dots
(AIP Publishing, 2009)F.A. Zwanenburg, A.A. van Loon, G.A. Steele, C.E.W.M. van Rijmenam, T. Balder, Y. Fang, C.M. Lieber and L.P. Kouwenhoven -
Ultrasmooth, Highly Spherical Monocrystalline Gold Particles for Precision Plasmonics
(American Chemical Society (ACS), 2013)Ultrasmooth, highly spherical monocrystalline gold particles were prepared by a cyclic process of slow growth followed by slow chemical etching, which selectively removes edges and vertices. The etching process effectively ... -
Ultrasound Servoing of Catheters for Beating Heart Valve Repair
(Springer Verlag, 2010)Robotic cardiac catheters have the potential to revolutionize heart surgery by extending minimally invasive techniques to complex surgical repairs inside the heart. However, catheter technologies are currently unable to ... -
Ultrasound-triggered disruption and self-healing of reversibly cross-linked hydrogels for drug delivery and enhanced chemotherapy
(Proceedings of the National Academy of Sciences, 2014)Foldable photoelectronics and muscle-like transducers require highly stretchable and transparent electrical conductors. Some conducting oxides are transparent, but not stretchable. Carbon nanotube films, graphene sheets ... -
Ultrastructural evidence for completion of the entire miracidial maturation in intrauterine eggs of the digenean Brandesia turgida (Brandes, 1888) (Plagiorchiida: Pleurogenidae)
(Springer Berlin Heidelberg, 2014)Results of this TEM study provide ultrastructural evidence that miracidial morphogenesis is fully completed within the intrauterine eggs situated in the most posterior uterine regions of the pleurogenid trematode Brandesia ... -
Ultrastructurally-smooth thick partitioning and volume stitching for larger-scale connectomics
(2015)FIB-SEM has become an essential tool for studying neural tissue at resolutions below 10×10×10 nm, producing datasets superior for automatic connectome tracing. We present a technical advance, ultrathick sectioning, which ... -
Ultrastructurally-smooth thick partitioning and volume stitching for larger-scale connectomics
(2015)FIB-SEM has become an essential tool for studying neural tissue at resolutions below 10×10×10 nm, producing datasets superior for automatic connectome tracing. We present a technical advance, ultrathick sectioning, which ... -
Ultrathin CVD Cu Seed Layer Formation Using Copper Oxynitride Deposition and Room Temperature Remote Hydrogen Plasma Reduction
(Electrochemical Society, 2008)Cu seed layers for future interconnects must have conformal step coverage, smooth surface morphology, and strong adhesion. Conformal deposition had been achieved by chemical vapor deposition (CVD), but CVD Cu films have ... -
An Ultraviolet Excess in the Superluminous Supernova Gaia16apd Reveals a Powerful Central Engine
(American Astronomical Society, 2017)Since the discovery of superluminous supernovae (SLSNe) in the last decade, it has been known that these events exhibit bluer spectral energy distributions than other supernova subtypes, with significant output in the ... -
Ultraviolet Line Emission From Metals in the Low-redshift Intergalactic Medium
(American Astronomical Society, 2004)We use a high-resolution cosmological simulation that includes hydrodynamics, multiphase star formation, and galactic winds to predict the distribution of metal line emission at z similar to 0 from the intergalactic medium ... -
Ultraviolet lithography of self-assembled monolayers for submicron patterned deposition
(AIP Publishing, 2000-10-09)