Now showing items 2672-2691 of 34081

    • Broadband super-collimation in a hybrid photonic crystal structure 

      Hamam, Rafif E.; Johnson, Steven G.; Joannopoulos, John D.; Soljacic, Marin; Ibanescu, Mihai (Optical Society of America, 2009-04)
      We propose a two dimensional (2D) photonic crystal (PhC) structure that supports super-collimation over a large frequency range (over 4 times that of a traditional square lattice of holes). We theoretically and numerically ...
    • Broadband surface-wave transformation cloak 

      Xu, Su; Xu, Hongyi; Gao, Hanhong; Jiang, Yuyu; Yu, Faxin; e.a. (National Academy of Sciences (U.S.), 2015-06)
      Guiding surface electromagnetic waves around disorder without disturbing the wave amplitude or phase is in great demand for modern photonic and plasmonic devices, but is fundamentally difficult to realize because light ...
    • Broadband Transparent Optical Phase Change Materials 

      Li, Junying; Yadav, Anupama; Lin, Hongtao; Du, Qingyang; Michon, Jerome; e.a. (Optical Society of America, 2017-05)
      We report a new group of optical phase change materials Ge-Sb-Se-Te (GSST) with low loss from telecom bands to LWIR. We further demonstrated GSST-integrated SiN photonics with significantly improved switching performance ...
    • Broadband unidirectional behavior of electromagnetic waves based on transformation optics 

      Zang, XiaoFei; Zhu, YiMing; Ji, XueBin; Chen, Lin; Hu, Qing; e.a. (Nature Publishing Group, 2017-01)
      High directive antennas are fundamental elements for microwave communication and information processing. Here, inspired by the method of transformation optics, we propose and demonstrate a transformation medium to control ...
    • Broadband velocity modulation spectroscopy of HfF[superscript +]: Towards a measurement of the electron electric dipole moment 

      Cossel, Kevin C.; Gresh, Daniel N.; Sinclair, Laura C.; Coffey, Tyler; Skripnikov, Leonid V.; e.a. (Elsevier, 2012-06)
      Precision spectroscopy of trapped HfF[superscript +] will be used to search for the permanent electric dipole moment of the electron (eEDM). Prior to this study, spectroscopic information necessary for state preparation, ...
    • Broadcasting in Time-Division Duplexing: A Random Linear Network Coding Approach 

      Lucani, Daniel Enrique; Medard, Muriel; Stojanovic, Milica (Institute of Electrical and Electronics Engineers, 2009-08)
      We study random linear network coding for broadcasting in time division duplexing channels. We assume a packet erasure channel with nodes that cannot transmit and receive information simultaneously. The sender transmits ...
    • Broadcasting in unreliable radio networks 

      Kuhn, Fabian; Lynch, Nancy Ann; Newport, Calvin Charles; Oshman, Rotem; Richa, Andrea (Association for Computing Machinery, 2010-07)
      Practitioners agree that unreliable links, which sometimes deliver messages and sometime do not, are an important characteristic of wireless networks. In contrast, most theoretical models of radio networks fix a static set ...
    • Broadcasting XORs: On the Application of Network Coding in Access Point-to-Multipoint Networks 

      Fouli, Kerim; Casse, Jerome; Sergeev, Ivan; Medard, Muriel; Maier, Martin (Springer-Verlag, 2012)
      We investigate network coding (NC) in access point-to-multi-point (PMP) broadcast networks. Characterized by a shared unicast upstream channel and a time-shared broadcast downstream channel, PMP networks are widely deployed ...
    • Broadening Accessibility Through Special Interests: A New Approach for Software Customization 

      Morris, Robert Randall; Kirschbaum, Connor R.; Picard, Rosalind W. (Association for Computing Machinery. / Association for Computing Machinery. Special Interest Group on Accessible Computing., 2010-01)
      Individuals diagnosed with autism spectrum disorder (ASD) often fixate on narrow, restricted interests. These interests can be highly motivating, but they can also create attentional myopia, preventing individuals from ...
    • Broadening Capital Acquisition with the Earnings of Capital as a Means of Sustainable Growth and Environmental Sustainability 

      Ashford, Nicholas A.; Ashford, Robert; Hall, Ralph P. (EBR Media, 2012-10)
      In a prior article in this edition – entitled Addressing the Crisis in Employment and Consumer Demand – it was argued that environmental sustainability with sustainable economic recovery requires sustainable earning capacity ...
    • Broader Horizons? 

      Ritvo, Harriet (Rachel Carson Center for Environment and Society, 2011-03)
      For very good reasons, obvious every time we hear the news, it is difficult to separate the future of environmental history from the future of the environment. The long record of our species’ engagement with the global ...
    • Broader Implications of Defining Standards for the Pluripotency of iPSCs 

      Daley, George Q.; Lensch, M. William; Jaenisch, Rudolf; Meissner, Alexander; Plath, Kathrin; e.a. (Elsevier B.V., 2009-03)
      We read with great interest the excellent review by Maherali and Hochedlinger (2008) that recommends standards for characterization of pluripotent stem cell lines, especially the many new lines being generated using ...
    • A Broadly Applicable Strategy for Entry into Homogeneous Nickel(0) Catalysts from Air-Stable Nickel(II) Complexes 

      Smith, Stacey J.; Jamison, Timothy F.; Standley, Eric; Mueller, Peter (American Chemical Society (ACS), 2014-04)
      A series of air-stable nickel complexes of the form L[subscript 2]Ni(aryl) X (L = monodentate phosphine, X = Cl, Br) and LNi(aryl)X (L = bis-phosphine) have been synthesized and are presented as a library of precatalysts ...
    • A broadly neutralizing human monoclonal antibody is effective against H7N9 

      Tharakaraman, Kannan; Subramanian, Vidya; Viswanathan, Karthik; Sloan, Susan; Yen, Hui-Ling; e.a. (National Academy of Sciences (U.S.), 2015-09)
      Emerging strains of influenza represent a significant public health threat with potential pandemic consequences. Of particular concern are the recently emerged H7N9 strains which cause pneumonia with acute respiratory ...
    • Broadly Neutralizing Influenza Hemagglutinin Stem-Specific Antibody CR8020 Targets Residues that Are Prone to Escape due to Host Selection Pressure 

      Tharakaraman, Kannan; Subramanian, Vidya; Cain, David; Sasisekharan, Viswanathan; Sasisekharan, Ram (Elsevier, 2014-05)
      Broadly neutralizing antibodies (bNAb) that target a conserved region of a viral antigen hold significant therapeutic promise. CR8020 is a bNAb that targets the stem region of influenza A virus (IAV) hemagglutinin (HA). ...
    • BROCKMAN: deciphering variance in epigenomic regulators by k-mer factorization 

      de Boer, Carl G.; Regev, Aviv (BioMed Central, 2018-07)
      Background: Variation in chromatin organization across single cells can help shed important light on the mechanisms controlling gene expression, but scale, noise, and sparsity pose significant challenges for interpretation ...
    • Broken Detailed Balance of Filament Dynamics in Active Networks 

      Gladrow, J.; MacKintosh, F. C.; Schmidt, C. F.; Broedersz, C. P.; Fakhri, Nikta (American Physical Society, 2016-06)
      Myosin motor proteins drive vigorous steady-state fluctuations in the actin cytoskeleton of cells. Endogenous embedded semiflexible filaments such as microtubules, or added filaments such as single-walled carbon nanotubes ...
    • Broken translational symmetry in an emergent paramagnetic phase of graphene 

      Chern, Gia-Wei; Fernandes, Rafael M.; Nandkishore, Rahul Mahajan; Chubukov, Andrey V. (American Physical Society, 2012-09)
      We show that the spin-density wave state on the partially filled honeycomb and triangular lattices is preempted by a paramagnetic phase that breaks an emergent Z[subscript 4] symmetry of the system associated with the four ...
    • Brokerage Professions and Implementing Reform in an Age of Experts 

      Kellogg, Katherine C. (SAGE Publications, 2014-08)
      In this comparative ethnographic case study of the implementation of a reform related to the Affordable Care Act in two community health centers, I find that professionals may not compete to claim new tasks (and thereby ...
    • The bromodomain protein Brd4 insulates chromatin from DNA damage signalling 

      Floyd, Scott R.; Pacold, Michael E.; Huang, Qiuying; Clarke, Scott M.; Rameseder, Jonathan; e.a. (Nature Publishing Group, 2013-06)
      DNA damage activates a signalling network that blocks cell-cycle progression, recruits DNA repair factors and/or triggers senescence or programmed cell death. Alterations in chromatin structure are implicated in the ...