Now showing items 107-126 of 157

    • Sea-spray regulates sulfate cloud droplet activation over oceans 

      Fossum, Kirsten N.; Ovadnevaite, Jurgita; Ceburnis, Darius; Preißler, Jana; Snider, Jefferson R.; Huang, Ru-Jin; Zuend, Andreas; O’Dowd, Colin (Nature Research (part of Springer Nature), 2020-04-08)
      Sulfate aerosols are typically the dominant source of cloud condensation nuclei (CCN) over remote oceans and their abundance is thought to be the dominating factor in determining oceanic cloud brightness. Their activation ...
    • A search for brief optical flashes associated with the SETI target KIC 8462852 

      Gillanders, Gary; Lang, Mark (IOP Publishing, 2016-02-18)
      The F-type star KIC. 8462852 has recently been identified as an exceptional target for search for extraterrestrial intelligence (SETI) observations. We describe an analysis methodology for optical SETI, which we have used ...
    • A search for CO+ in planetary nebulae 

      Redman, Matt P. (2007)
      We have carried out a systematic search for the molecular ion CO+ in a sample of 8 protoplanetary and planetary nebulae in order to determine the origin of the unexpectedly strong HCO+ emission previously detected in these ...
    • A Search for Dark Matter Annihilation with the Whipple 10m Telescope 

      Lang, Mark (2008)
      We present observations of the dwarf galaxies Draco and Ursa Minor, the local group galaxies M32 and M33, and the globular cluster M15 conducted with the Whipple 10m gamma-ray telescope to search for the gamma-ray signature ...
    • A search for optical bursts from RRAT J1819-1458: II. Simultaneous ULTRACAM-Lovell Telescope observations 

      Shearer, Andrew (2011)
      The Rotating RAdio Transient (RRAT) J1819-1458 exhibits ~3 ms bursts in the radio every ~3 min, implying that it is visible for only ~1 per day. Assuming that the optical light behaves in a similar manner, long exposures ...
    • A search for pulsations from Geminga above 100 GeV with VERITAS 

      Connolly, M.P.; Gillanders, Gary; Moriarty, P.; Lang, Mark (American Astronomical Society, 2015-02-10)
      We present the results of 71.6 hr of observations of the Geminga pulsar (PSR J0633+1746) with the VERITAS very-high-energy gamma-ray telescope array. Data taken with VERITAS between 2007 November and 2013 February were ...
    • A Search for Pulsed TeV Gamma Ray Emission from the Crab Pulsar 

      Lang, Mark; Gillanders, Gary (1999)
      We present the results of a search for pulsed TeV emission from the Crab pulsar using the Whipple Observatory's 10m gamma-ray telescope. The direction of the Crab pulsar was observed for a total of 73.4 hours between 1994 ...
    • A Search for Pulsed TeV Gamma Ray Emission from the Crab Pulsar 

      Lang, Mark; Gillanders, Gary; Burdett, A. M.; Bond, I. H.; Boyle, P. J.; Bradbury, S. M.; Buckley, J. H.; Carter-Lewis, D. A.; Catanese, M.; Cawley, M. F.; D'Vali, M.; Fegan, D. J.; Fegan, S. J.; Finley, J. P.; Gaidos, J. A.; Gillanders, G. H.; Hall, T. A.; Hillas, A. M.; Kildea, J.; Knapp, J.; Krennrich, F.; Lang, M. J.; LeBohec, S.; Lessard, R. W.; Masterson, C.; Moriarty, P.; Quinn, J.; Rose, H. J.; Samuelson, F. W.; Sembroski, G. H.; Srinivasan, R.; Vassiliev, V. V.; Weekes, T. C. (1999)
      We present the results of a search for pulsed TeV emission from the Crab pulsar using the Whipple Observatory's 10m gamma-ray telescope. The direction of the Crab pulsar was observed for a total of 73.4 hours between 1994 ...
    • Search for Pulsed TeV Gamma-ray Emission from the Crab Pulsar 

      Lang, Mark; Gillanders, Gary (1999)
      We present the results of a search for pulsed TeV emission from the Crab pulsar using the Whipple Observatory's 10 m gamma-ray telescope. The direction of the Crab pulsar was observed for a total of 73.4 hours between 1994 ...
    • Search for Pulsed TeV Gamma-ray Emission from the Crab Pulsar 

      Lang, Mark; Gillanders, Gary; Lessard, R. W.; Bond, I. H.; Bradbury, S. M.; Buckley, J. H.; Burdett, A. M.; Carter-Lewis, D. A.; Catanese, M.; Cawley, M. F.; D'Vali, M.; Fegan, D. J.; Finley, J. P.; Gaidos, J. A.; Gillanders, G. H.; Hall, T.; Hillas, A. M.; Krennrich, F.; Lang, M. J.; Masterson, C.; Moriarty, P.; Quinn, J.; Rose, H. J.; Samuelson, F. W.; Sembroski, G. H.; Srinivasan, R.; Vassiliev, V. V.; Weekes, T. C. (1999)
      We present the results of a search for pulsed TeV emission from the Crab pulsar using the Whipple Observatory's 10 m gamma-ray telescope. The direction of the Crab pulsar was observed for a total of 73.4 hours between 1994 ...
    • Sensitive and selective quantification of glyphosate and aminomethylphosphonic acid (AMPA) in urine of the general population by gas chromatography-tandem mass spectrometry 

      Connolly, Alison; Koslitz, Stephan; Bury, Daniel; Brüning, Thomas; Conrad, André; Kolossa-Gehring, Marike; Coggins, Marie A.; Koch, Holger M. (Elsevier, 2020-08-26)
      Glyphosate is the highest volume herbicide used worldwide, and its main biodegradation product is aminomethylphosphonic acid (AMPA), both are listed as priority substances in the Human Biomonitoring for Europe initiative ...
    • Simple characterization scheme for optical coherence tomography systems with application to a commercial and a near-isometric resolution fibre-based system 

      Dey, Rajib; Zhou, Yi; Neuhaus, Kai; Alexandrov, Sergey; Nolan, Andrew; Chang, Ting-Chiao; Leahy, Martin (2021-12-14)
      Optical Coherence Tomography (OCT) is a rapidly growing imaging modality in biomedical optics. OCT can perform high-resolution, cross-sectional imaging of the microstructure of biological tissues by measuring the coherent ...
    • Simultaneous en-face imaging of multiple layers with multiple reference optical coherence tomography 

      Neuhaus, Kai; O’Gorman, Seán; McNamara, Paul M.; Alexandrov, Sergey; Hogan, Josh; Wilson, Carol; Leahy, Martin J. (Society of Photo-optical Instrumentation Engineers, 2017-08-22)
      A technique based on multiple reference optical coherence tomography (MR-OCT) is proposed for simultaneous imaging at multiple depths. The technique has been validated by imaging a reference sample and a fingerprint in-vivo. ...
    • Simultaneous Multiwavelength Observations of Markarian 421 During Outburst 

      Lang, Mark (2009)
      We report on the results of two coordinated multiwavelength campaigns that focused on the blazar Markarian 421 during its 2006 and 2008 outbursts. These campaigns obtained UV and X-ray data using the XMM-Newton satellite, ...
    • Sophisticated clean air strategies required to mitigate against particulate organic pollution 

      Grigas, Tomas; Ovadnevaite, Jurgita; Ceburnis, Darius; Moran, E.; McGovern, F.M.; Jennings, Stephen G.; O'Dowd, Colin (Nature Publishing Group, 2017-03-17)
      Since the 1980's, measures mitigating the impact of transboundary air pollution have been implemented successfully as evidenced in the 1980-2014 record of atmospheric sulphur pollution over the NE-Atlantic, a key region ...
    • Spatial frequency domain correlation mapping optical coherence tomography for nanoscale structural characterization 

      Alexandrov, Sergey; McNamara, Paul M.; Das, Nandan; Zhou, Yi; Lynch, Gillian; Hogan, Josh; Leahy, Martin (AIP Publishing, 2019-09-16)
      Most of the fundamental pathological processes in living tissues exhibit changes at the nanoscale. Noninvasive, label-free detection of structural changes in biological samples pose a significant challenge to both researchers ...
    • Spectral encoding of spatial frequency approach for characterization of nanoscale structures 

      Alexandrov, Sergey; Uttam, Shikhar; Bista, Rajan K.; Staton, Kevin; Liu, Yang (American Institute of Physics, 2012-07-17)
      An approach to acquire axial structural information at nanoscale is demonstrated. It is based on spectral encoding of spatial frequency principle to reconstruct the structural information about the axial profile of the ...
    • Status of the VERITAS Observatory 

      Lang, Mark; Gillanders, Gary (2008)
      VERITAS, an Imaging Atmospheric Cherenkov Telescope (IACT) system for gammma-ray astronomy in the GeV-TeV range, has recently completed its first season of observations with a full array of four telescopes. A number of ...
    • Summertime primary and secondary contributions to Southern Ocean cloud condensation nuclei 

      Fossum, Kirsten N.; Ovadnevaite, Jurgita; Ceburnis, Darius; Dall'Osto, Manuel; Marullo, Salvatore; Bellacicco, Marco; Simó, Rafel; Liu, Dantong; Flynn, Michael; Zuend, Andreas; O'Dowd, Colin (Nature Research (part of Springer Nature), 2019-07-18)
      Atmospheric aerosols in clean remote oceanic regions contribute significantly to the global albedo through the formation of haze and cloud layers; however, the relative importance of ‘primary’ wind-produced sea-spray over ...
    • Supersonic turbulence in the cold massive core JCMT 18354-0649S 

      Redman, Matt P. (2009)
      An example of a cold massive core, JCMT 18354-0649S, a possible high mass analogue to a low mass star forming core is studied. Line and continuum observations from JCMT, Mopra Telescope and Spitzer are presented and modelled ...