Now showing items 776-789 of 789

    • The W mass and the U parameter 

      Takeuchi, T.; Loinaz, W.; Okamura, N.; Wijewardhana, L. C. R. (2003)
    • Water-pollution monitoring using matched spatial filters 

      Almeida, S. P.; Eu, J. K. T. (Optical Society of America, 1976-02)
      Presented are some results obtained from the application of matched spatial filtering techniques to the identification of biological specimens called diatoms (i.e., water algae). A prototype semiautomatic optical processor ...
    • Weak hard X-ray emission from two broad absorption line quasars observed with NuSTAR: Compton-thick absorption or intrinsic X-ray weakness? 

      Luo, B.; Brandt, W. N.; Alexander, D. M.; Harrison, F. A.; Stern, D.; Bauer, F. E.; Boggs, S. E.; Christensen, F. E.; Comastri, A.; Craig, W. W.; Fabian, A. C.; Farrah, D.; Fiore, F.; Fuerst, F.; Grefenstette, B. W.; Hailey, C. J.; Hickox, R.; Madsen, K. K.; Matt, G.; Ogle, P.; Risaliti, G.; Saez, C.; Teng, S. H.; Walton, D. J.; Zhang, W. W. (IOP Publishing Ltd., 2013-08)
      We present Nuclear Spectroscopic Telescope Array (NuSTAR) hard X-ray observations of two X-ray weak broad absorption line (BAL) quasars, PG 1004+130 (radio loud) and PG 1700+518 (radio quiet). Many BAL quasars appear X-ray ...
    • Weakly pinned Bose glass vs Mott insulator phase in superconductors 

      Wengel, C.; Täuber, Uwe C. (1997-06-23)
    • Why double-stranded RNA resists condensation 

      Tolokh, Igor S.; Pabit, Suzette A.; Katz, Andrea M.; Chen, Yujie; Drozdetski, Aleksander; Baker, Nathan; Pollack, Lois; Onufriev, Alexey V. (2014-09-15)
      The addition of small amounts of multivalent cations to solutions containing double-stranded DNA leads to inter-DNA attraction and eventual condensation. Surprisingly, the condensation is suppressed in double-stranded RNA, ...
    • Wilson lines and Chern-Simons flux in explicit heterotic Calabi-Yau compactifications 

      Apruzzi, Fabio; Gautason, Fridrik Freyr; Parameswaran, Susha; Zagermann, Marco (Springer, 2015-02-27)
      We study to what extent Wilson lines in heterotic Calabi-Yau compactifications lead to non-trivial H-flux via Chern-Simons terms. Wilson lines are basic ingredients for Standard Model constructions but their induced H-flux ...
    • WISE detections of known QSOs at redshifts greater than six 

      Blain, A. W.; Assef, R.; Stern, D.; Tsai, C. W.; Eisenhardt, P.; Bridge, C.; Benford, D.; Jarrett, T.; Cutri, R.; Petty, S.; Wu, J. W.; Wright, E. L. (IOP Publishing Ltd., 2013-12)
      We present WISE All-Sky mid-infrared (IR) survey detections of 55% (17/31) of the known QSOs at z > 6 from a range of surveys: the SDSS, the CFHT-LS, FIRST, Spitzer, and UKIDSS. The WISE catalog thus provides a substantial ...
    • Witten index for noncompact dynamics 

      Lee, Seung-Joo; Yi, Piljin (Springer, 2016-06-16)
      Among gauged dynamics motivated by string theory, we find many with gapless asymptotic directions. Although the natural boundary condition for ground states is L-2, one often turns on chemical potentials or supersymmetric ...
    • Wulff shapes and the critical nucleus for a triangular Ising lattice 

      Shneidman, V. A.; Zia, R. K. P. (American Physical Society, 2001-02)
      Equilibrium Wulff shapes and interfacial energies of two-dimensional "crystals" on a triangular lattice are considered. Asymptotic approximations are constructed for both the shapes and energies in the limit T-->0 where ...
    • X-ray absorption analysis of MCG-6-30-15: Discerning three kinematic systems 

      Holczer, T.; Behar, E.; Arav, Nahum (IOP Publishing Ltd., 2010-01)
      By analyzing the X-ray spectrum of MCG -6-30-15 obtained with the High Energy Transmission Grating (HETGS) spectrometer on board the Chandra observatory, we identify three kinematically distinct absorption systems; two ...
    • XMM-Newton RGS observation of the warm absorber in Mrk 279 

      Ebrero, J.; Constantini, E.; Kaastra, J. S.; Detmers, R. G.; Arav, Nahum; Kriss, G. A.; Korista, K. T.; Steenbrugge, K. C. (EDP Sciences, 2010-09-10)
      Context. The Seyfert 1 galaxy Mrk 279 was observed by XMM-Newton in November 2005 on three consecutive orbits, showing significant short-scale variability (average soft band variation in flux ~20%). The source is known to ...
    • XMM-Newton unveils the complex iron K alpha region of Mrk 279 

      Costantini, E.; Kaastra, J. S.; Korista, K.; Ebrero, J.; Arav, Nahum; Kriss, G.; Steenbrugge, K. C. (EDP Sciences, 2010-03-04)
      We present the results of a similar to 160 ks-long XMM-Newton observation of the Seyfert 1 galaxy Mrk 279. The spectrum shows evidence of both broad and narrow emission features. The FeK alpha line may be equally well ...
    • α-states in de Sitter space 

      de Boer, J.; Jejjala, V.; Minic, D. (American Physical Society, 2005-02)
      Field theory in de Sitter space admits a one-parameter family of vacua determined by a superselection parameter alpha. Of these vacua, the Euclidean vacuum uniquely extrapolates to the vacuum of flat Minkowski space. States ...