Now showing items 1-20 of 5219

    • The 04 – 10 September 2017 Sun–Earth Connection Events: Solar Flares, Coronal Mass Ejections/Magnetic Clouds, and Geomagnetic Storms 

      Wu, Chin-Chun; Liou, Kan; Lepping, Ronald P.; Hutting, Lynn (Springer Netherlands, 2019-08-23)
      In early September 2017, a series of solar flares and coronal mass ejections (CMEs) erupted from the Sun. The Cor2a coronagraph, a unit of the Sun Earth Connection Coronal and Heliospheric Investigation (SECCHI), onboard ...
    • 150 years of the geography of innovation 

      Andrews, Michael J.; Whalley, Alexander (Elsevier, 2021-01-25)
      Innovation has long been seen as central to long-term regional growth. Due to the absence of comprehensive data on the geography of innovation covering long time periods, quantifying long-term innovation-development linkages ...
    • A 1D fluid model of the Centaurus A jet 

      Wykes, Sarka; Snios, Bradford T.; Nulsen, Paul E. J.; Kraft, Ralph P.; Birkinshaw, Mark; Hardcastle, Martin J.; Worrall, Diana M.; McDonald, Iain; Rejkuba, Marina; Jones, Thomas W.; Stark, David J.; Forman, William R.; Meyer, Eileen T.; Jones, Christine (2018-09-27)
      We implement a steady, one-dimensional flow model for the X-ray jet of Centaurus A in which entrainment of stellar mass loss is the primary cause of dissipation. Using over 260 ks of new and archival Chandra/ACIS data, we ...
    • 2 mm GISMO Observations of the Galactic Center. I. Dust Emission 

      Arendt, Richard G; Staguhn, Johannes; Dwek, Eli; Morris, Mark R; Yusef-Zadeh, Farhad; Benford, Dominic J; Kovacs, Attila; Gonzalez-Quiles, Junellie (The American Astronomical Society, 2019-11-01)
      The Central Molecular Zone (CMZ), covering the inner ∼ 1 ◦ of the Galactic plane has been mapped at 2 mm using the GISMO bolometric camera on the 30 m IRAM telescope. The 2100 resolution maps show abundant emission from ...
    • 2 mm GISMO Observations of the Galactic Center. II. A Nonthermal Filament in the Radio Arc and Compact Sources 

      Staguhn, Johannes; Arendt, Richard G; Dwek, Eli; Morris, Mark R; Yusef-Zadeh, Farhad; Benford, Dominic J; Kovacs, Attila; Gonzalez-Quiles, Junellie (The American Astronomical Society, 2019-11-01)
      We have used the Goddard IRAM 2-Millimeter Observer (GISMO) with the 30 m IRAM telescope to carry out a 2 mm survey of the Galaxy’s central molecular zone (CMZ). These observations detect thermal emission from cold ISM ...
    • The 2019 outburst of the 2005 classical nova V1047 Cen: a record breaking dwarf nova outburst or a new phenomenon? 

      Aydi, E.; Sokolovsky, K. V.; Bright, J. S.; Tremou, E.; Nyamai, M. M.; Evans, A.; Strader, J.; Chomiuk, L.; Myers, G.; Hambsch, F-J.; Page, K. L.; Buckley, D. A. H.; Woodward, C. E.; Walter, F. M.; Mróz, P.; Vallely, P. J.; Geballe, T. R.; Banerjee, D. P. K.; Gehrz, R. D.; Fender, R. P.; Gromadzki, M.; Kawash, A.; Knigge, C.; Mukai, K.; Munari, U.; Orio, M.; Ribeiro, V. A. R. M.; Sokoloski, J. L.; Starrfield, S.; Udalski, A.; Woudt, P. A. (2021-08-17)
      We present a detailed study of the 2019 outburst of the cataclysmic variable V1047 Cen, which hosted a classical nova eruption in 2005. The peculiar outburst occurred 14 years after the classical nova event, lasted for ...
    • 2021 Effective Area calibration of the Nuclear Spectroscopic Telescope ARray (NuSTAR) 

      Madsen, Kristin; Forster, Karl; Grefenstette, Brian W.; Harrison, Fiona A.; Miyasaka, Hiromasa (SPIE, 2021-10-21)
      We present here the updated calibration of The Nuclear Spectroscopic Telescope ARray NuSTAR, which was performed using data on the Crab accumulated over the last 9 years in orbit. The basis for this new calibration contains ...
    • 2021 Roadmap on Neuromorphic Computing and Engineering 

      Mazumder, Arnab Neelim; Hosseini, Morteza; Mohsenin, Tinoosh; et al. (IOP Publishing, 2021-05-12)
      Modern computation based on the von Neumann architecture is today a mature cutting-edge science. In this architecture, processing and memory units are implemented as separate blocks interchanging data intensively and ...
    • The 21-cm signal from the Cosmic Dawn: metallicity dependence of high mass X-ray binaries 

      Kaur, Harman Deep; Qin, Yuxiang; Mesinger, Andrei; Pallottini, Andrea; Fragos, Tassos; Basu-Zych, Antara (2022-03-21)
      X-rays from High-Mass X-ray Binaries (HMXBs) are likely the main source of heating of the intergalactic medium (IGM) during Cosmic Dawn (CD), before the completion of reionization. This Epoch of Heating (EoH; z∼10−15) ...
    • 3 Kinds of Nouns: Counting is Not Always the Issue 

      Nelson, John; Wowk, Tymofey (Originally published by:, 2012)
    • A 3 pc Scale Jet-driven Outflow from Sgr A* 

      Yusef-Zadeh, F.; Arendt, Richard; Bushouse, H.; Cotton, W.; Haggard, D.; Pound, M. W.; Roberts, D. A.; Royster, M.; Wardle, M. (IOP Science, 2012-09-21)
      The compact radio source Sgr A* is coincident with a 4 × 106 M☉ black hole at the dynamical center of the Galaxy and is surrounded by dense orbiting ionized and molecular gas. We present high-resolution radio continuum ...
    • The 32-year record-high surface melt in 2019/2020 on the northern George VI Ice Shelf, Antarctic Peninsula 

      Banwell, Alison F.; Datta, Rajashree Tri; Dell, Rebecca L.; Moussavi, Mahsa; Brucker, Ludovic; Picard, Ghislain; Shuman, Christopher A.; Stevens, Laura A. (Copernicus Publications, 2020-10-22)
      In the 2019/2020 austral summer, the surface melt duration and extent on the northern George VI Ice Shelf (GVIIS) was exceptional compared to the 31 previous summers of dramatically lower melt. This finding is based on ...
    • 3D-Printed Microfluidic Devices for Enhanced Online Sampling and Direct Optical Measurements 

      Kabandana, Giraso Keza Monia; Jones, Curtis G.; Sharifi, Sahra Khan; Chen, Chengpeng (ACS Publications, 2020-05-03)
      3D printing has emerged as a robust technique to fabricate reliable and reproducible microfluidic devices. However, a limitation of 3D-printed devices has been the low transparency even when printed in a “clear” material. ...
    • A 3D-Printed, Modular, and Parallelized Microfluidic System with Customizable ECM Integration to Investigate the Roles of Basement Membrane Topography on Endothelial Cells 

      Jones, Curtis G.; Huang, Tianjiao; Chung, Jay H.; Chen, Chengpeng (2021-02-05)
      Because dysfunctions of endothelial cells are involved in many pathologies, in vitro endothelial cell models for pathophysiological and pharmaceutical studies have been a valuable research tool. Although numerous ...
    • 4 pillars of college success in science 

      Hrabowski, Freeman (TED Conferences, LLC, 2013-02)
      At age 12, Freeman Hrabowski marched with Martin Luther King. Now he's president of the University of Maryland, Baltimore County (UMBC), where he works to create an environment that helps under-represented students -- ...
    • 4 reasons gerrymandering is getting worse 

      Short, John Rennie (The Conversation, 2018-10-29)
    • 4 reasons gerrymandering is getting worse 

      Short, John Rennie (Raw Story Media, 2018-10-30)
      November’s midterm elections are some of the most eagerly awaited, closely watched and hyperpartisan for many years. But the results for many congressional House seats are already known because the election will occur at ...
    • 4 reasons gerrymandering is getting worse 

      Short, John Rennie (Salon, 2018-11-01)
      November’s midterm elections are some of the most eagerly awaited, closely watched and hyperpartisan for many years. But the results for many congressional House seats are already known because the election will occur at ...
    • 4 Reasons Why Americans Have Lost Trust in the Government 

      Short, John Rennie (Time, 2016-10-11)
      Elections normally decide who is to govern. This upcoming election is about the very legitimacy of the system. At the final presidential debate, Republican candidate Donald Trump made the remarkable statement that he might ...