Ball State Faculty, Student, and Staff Research

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Ball State Faculty, Student, and Staff Research

Recent Submissions

  • Berrington, Robert C.; Dermer, Charles D.; Sturner, S.J. (2001)
    Subcluster interactions within clusters of galaxies produce shocks that accelerate nonthermal particles. We treat Fermi acceleration of nonthermal electrons and protons by injecting power-law distributions of particles ...
  • Berrington, Robert C.; Dermer, Charles D. (2004)
    We have developed a numerical model for the temporal evolution of particle and photon spectra resulting from nonthermal processes at the shock fronts formed in merging clusters of galaxies. Fermi acceleration is approximated ...
  • Berrington, Robert C.; Dermer, Charles D. (2004)
    A numerical simulation model of the injection and cooling of nonthermal particles energized by shocks formed in merging clusters of galaxies is used to fit radio and X-ray data observed from the Coma cluster of galaxies. ...
  • Drukier, G.A.; Slavin, S.D.; Cohn, H.N.; Lugger, P.M.; Berrington, Robert C.; Murphy, B.W.; Seitzer, P.O. (1998-02)
    We present velocities for 230 stars in the outer parts of the globular cluster M15 measured with the Hydra multifiber spectrograph on the 3.5 m WIYN telescope. A new Bayesian technique is used for analyzing the data. The ...
  • Pierce, Michael J.; Berrington, Robert C. (2000-02-22)
    We present evidence for non-Gaussian velocity fields within the cores of luminous elliptical galaxies. This evidence is based on high signal-to-noise ratio, medium-resolution spectroscopy of the cores of early-type members ...
  • Berrington, Robert C.; Lugger, Phyllis M.; Cohn, Haldan N. (2002-05)
    We present 236 new radial velocities of galaxies in the cluster A2256 measured with the WIYN Hydra Multi-Object Spectrograph. Combined with the previous work of Fabricant, Kent, & Kurtz, we have velocities for a total of ...
  • Berrington, Robert C.; Dermer, Charles D. (2003-09-10)
    We have developed a numerical model for the temporal evolution of particle and photon spectra resulting from nonthermal processes at the shock fronts formed in merging clusters of galaxies. Fermi acceleration is approximated ...
  • Drukier, G.A.; Cohn, H.N.; Lugger, P.M.; Slavin, S.D.; Berrington, Robert C.; Murphy, B.W. (2007-02-07)
    We report the determination of high-accuracy radial velocities for 306 members of the globular cluster M92 using the Hydra multiobject spectrograph on the WIYN telescope. We have concentrated on stars outside of the central ...
  • Berrington, Robert C. (1991)
    From newly collected data at the Maria Mitchell Observatory, a new ephemeris of V801 Cygni is derived.
  • Berrington, Robert C.; Hall, Douglas S. (1994-05)
    Timings of primary eclipse up through 1992 are collected, plus a few overlooked in earlier studies. Analysis show that, after decreasing until approximately equals 1919 and increasing since then, the period has now started ...
  • Bode, Paul W.; Berrington, Robert C.; Cohn, Haldan N.; Lugger, Phyllis M. (1994-10)
    We report N-body simulations of the dynamical evolution of isolated clusters of 50 galaxies containing a dark matter component that comprises 90% of the cluster mass. For our adopted physical scaling, the line-of- sight ...
  • Kiminki, Daniel C.; Kobulnicky, Henry A.; Kinemuchi, K.; Irwin, Jennifer S.; Fryer, Christopher L.; Berrington, Robert C.; Uzpen, B.; Monson, Andy J.; Pierce, Michael J.; Woosley, S.E. (2006-09-27)
    We conducted a radial velocity survey of the Cyg OB2 association over a 6 yr (1999-2005) time interval to search for massive close binaries. During this time we obtained 1139 spectra on 146 OB stars to measure mean systemic ...
  • Keel, William C.; Oswalt, Terry; Mack, Peter; Henson, Gary; Hillwig, Todd; Batcheldor, Daniel; Berrington, Robert C.; De Pree, Chris; Hartmann, Dieter; Leake, Martha; Licandro, Javier; Murphy, Brian; Webb, James; Wood, Matt A. (2016-11-30)
    We describe the remote facilities operated by the Southeastern Association for Research in Astronomy (SARA) , a consortium of colleges and universities in the US partnered with Lowell Observatory, the Chilean National ...
  • Berrington, Robert C.; Brotherton, Michael S.; Gallagher, Sarah C.; Ganguly, Rajib; Shang, Zhaohouli; DiPompeo, Michael; Chatterjee, Ritaban; Lacy, Mark; Gregg, Michael D.; Hall, Patrick B.; Laurent-Muehleisen, S.A. (2013-10-23)
    We report the results of a new 60 ks Chandra X-ray Observatory Advanced CCD Imaging Spectrometer S-array (ACIS-S) observation of the reddened, radio-selected, highly polarized ‘FeLoBAL’ quasar FIRST J1556+3517. We investigated ...
  • Orozco, Luis Eduardo (2019)
    Online classes allow the convenience of learners to connect and retrieve information at any time. One of the most important activities from online classes is the interaction among students using an online discussion ...
  • Ajibola, Olayinka (2019)
    Over the years, terrorist organizations have established various networks across the world and have inspired new ideas causing a rise in terrorist activities. This research examines the comparison of terrorist groups in ...
  • Rangarajan, Deva; Boute, Robert; Weijters, Bert; Paesbrugghe, Bert (2015)
    In this paper we focus on the collaboration and alignment between the Sales and Operations teams in organizations. Although the potential benefits of collaboration and alignment between sales and operations are significant, ...
  • Rangarajan, Deva (2016)
    Demanding customers, stiff competition, focus of companies on short term gains has meant that the sales manager today is under tremendous pressure to cope with these problems or run the risk of seeing declining revenues, ...
  • Gelb, Betsy D.; Rangarajan, Deva; Hallikainen, Heli; Laukkanen, Tommi (2019)
    The increasing use of “big data” -- large, multi-dimensional and quickly changing datasets -- prompted this research, depth interviews that explore how big data affect organizations or even society at large. Examples ...

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