Now showing items 1-20 of 1946

    • 2006 May-July major radio flare episodes in Cygnus X-3: Spectrotiming analysis of the X-ray data 

      Koljonen, Karri I. I.; McCollough, Michael L.; Hannikainen, Diana Carina; Droulans, Robert (2013)
      We analyse in detail the X-ray data of the microquasar Cygnus X-3 obtained during major radio flaring episodes in 2006 with multiple observatories. The analysis consists of two parts: probing the fast (~1min) X-ray spectral ...
    • The 2010 very high energy y-ray flare and 10 years of multi-wavelength observations of M 87 

      Cara, Mihai; Perlman, Eric S.; Abramowski, A.; Acero, F.; Aharonian, F.; Akhperjanian, A. G.; Anton, G.; Balzer, A.; Barnacka, A.; Barres de Almeida, U. (2012-02-02)
      The giant radio galaxy M 87 with its proximity (16 Mpc), famous jet, and very massive black hole ((3 – 6) × 109 M ☉) provides a unique opportunity to investigate the origin of very high energy (VHE; E > 100 GeV) γ-ray ...
    • 2016 Baja Car 

      Al Jaberi, Khalid; Al Katheeri, Mohamed; Al Saleh, Bader; Alblooshi, Saeed; Bonilla, Martin; Salvador, David Cabrera; Faden, Sari; Heeke, Elizabeth; Mo, Jiaqi; Pounder, Andre-Louis; Wang, Bo
      The purpose is to design and build a rolling chassis that is capable of traversing various terrains, which will provide support to the components and make driver feel comfortable and safe to drive.
    • 2DEG channel-dependent model for Hg1-xCdxTe based pseudomorphic HEMTs 

      Dai, Hang- Ming; Sanders, Thomas J. (2000-07-18)
      HgCdTe has emerged as an important electronic material because of its IRFPA applications. Technologies for growing the material are advanced and current sources for the material are more readily available than in the past. ...
    • 2MASS J0516288+260738: Discovery of the first eclipsing late K + Brown dwarf binary system? 

      Schüh, Sonja L.; Handler, Gerald; Drechsel, Horst; Hauschildt, Peter H.; Dreizler, Stefan; Medupe, R.; Karl, C. A.; Napiwotzki, Ralf; Kim, Seunglee; Wood, Matt A. (2003-11)
      We report the discovery of a new eclipsing system less than one arcminute south of the pulsating DB white dwarf KUV 05134+2605 . The object could be identified with the point source 2MASS J0516288+260738 published by the ...
    • 70 DA white dwarfs identified in LAMOST pilot survey 

      Luo, A.L.; Oswalt, Terry D.; Zhao, J.K.; Zhao, G. (2013-06)
      We present a spectroscopically identified catalog of 70 DA white dwarfs (WDs) from the LAMOST pilot survey. Thirty-five are found to be new identifications after cross-correlation with the Eisenstein et al. and Villanova ...
    • The 72-h WEBT microvariability observation of blazar S5 0716+714 in 2009 

      Bhatta, G.; Webb, James R.; Hollingsworth, H.; Dhalla, S.; Khanuja, A.; Bachev, Rumen S.; Blinov, Dmitry A.; Böttcher, Markus; Bravo Calle, O. J A; Vennes, Stéphane (2013-10-10)
      Context. The international Whole Earth Blazar Telescope (WEBT) consortium planned and carried out three days of intensive micro-variability observations of S5 0716+714 from February 22, 2009 to February 25, 2009. This ...
    • A Robot Platform for Intelligent Ground Vehicle Research 

      Li, Jihang (2016-11)
      This thesis presents a mobile platform developed for further research on the Intellegent Ground Vehicle project which began as a capstone project but without achieving full autonomy. The scope of the current project is ...
    • Abundance of elements beyond the iron group in cool do white dwarfs 

      Chayer, Pierre; Vennes, Stéphane; Dupuis, Jean François; Kruk, Jeffrey W. (2005-09-10)
      We report the presence of elements beyond the iron group in the atmospheres of the cool DO white dwarfs HD 149499 B and HZ 21. Photospheric lines of germanium (Z = 32), arsenic (33), selenium (34), tin (50), tellurium (52), ...
    • Abundances and energy spectra of corotating interaction region heavy ions observed during solar cycle 23 

      Mason, Glenn M.; Leske, Richard A.; Desai, Mihir I.; Cohen, Christina M S; Dwyer, Joseph R.; Mazur, Joseph E.; Mewaldt, Richard A.; Gold, Robert E.; Krimigis, Stamatios M. (2008-05-10)
      Using instruments on the ACE spacecraft, we surveyed the heavy-ion spectra and composition over the range He– Fe for 41 corotating interaction regions (CIRs) during 1998–2007. Below~ 1 MeV nucleon^-1 the spectra are power ...
    • Abundances of heavy and ultraheavy ions in ³He-rich solar flares 

      Mason, Glenn M.; Mazur, Joseph E.; Dwyer, Joseph R.; Jokipii, Jack Randy; Gold, Robert E.; Krimigis, Stamatios M. (2004-05-01)
      We have surveyed ³He-rich solar energetic particle (SEP) events over the period 1997 September-2003 April in order to characterize abundances of heavy ions near 400 keV nucleonˉ¹. The first part of the study focuses on 20 ...
    • Acceleration of low-energy ions at parallel shocks with a focused transport model 

      Zuo, Pingbing; Zhang, Ming; Rassoul, Hamid K. (2013-04-10)
      We present a test particle simulation on the injection and acceleration of low-energy suprathermal particles by parallel shocks with a focused transport model. The focused transport equation contains all necessary physics ...
    • Acceleration of suprathermal particles by compressional plasma wave trains in the solar wind 

      Zhang, Ming (2010-12-04)
      This paper presents a calculation of particle acceleration by an idealized compressional plasma wave train. In this model, suprathermal particles, such as pickup ions, are continuously injected into a wave train consisting ...
    • Acceleration of ³He nuclei at interplanetary shocks 

      Desai, Mihir I.; Mason, Glenn M.; Dwyer, Joseph R.; Mazur, Joseph E.; Smith, Charles W.; Skoug, Ruth M. (2001-05-20)
      e have surveyed the 0.5-2.0 MeV nucleonˉ¹ ion composition of 56 interplanetary (IP) shocks observed with the Ultra - Low-Energy Isotope Spectrometer on board the Advanced Composition Explorer from 1997 October 1 through ...
    • Acquisition of airborne imagery in support of Deepwater Horizon oil spill recovery assessments 

      Bostater, Charles R.; Müller-Karger, Frank Edgar (2012-10-19)
      Remote sensing imagery was collected from a low flying aircraft along the near coastal waters of the Florida Panhandle and northern Gulf of Mexico and into Barataria Bay, Louisiana, USA, during March 2011. Imagery was ...
    • Activity coefficient and the Einstein relation 

      Landsberg, Peter T.; Guy, Albert G. (1983-07-15)
      A connection between the activity coefficient of current carriers and the Einstein relations is established by two methods, one based on normal semiconductor concepts and one based on irreversible thermodynamics. The ...
    • An Adaptive Distributed Data Aggregation based on RCPC for Wireless Sensor Networks 

      Hua, Guogang; Chen, Chang Wen (2006-05-10)
      One of the most important design issues in wireless sensor networks is energy efficiency. Data aggregation has significant impact on the energy efficiency of the wireless sensor networks. With massive deployment of sensor ...
    • Adaptive handoff algorithms based on self-organizing neural networks to enhance the quality of service of nonstationary traffic in hierarchical cellular networks 

      Hortos, William S. (2000-03-30)
      Third-generation (3G) wireless networks, based on a hierarchical cellular structure (HCS), support tiered levels of multimedia services. These services can be categorized as real-time and delay-sensitive, or non-real-time ...
    • Adaptive threshold selection technique for denoising in dithered quantizers 

      Kozatis, Samuel Peter; Goswami, Hemen (2001-03-26)
      We described an adaptive denoising method to improve image quality in a wavelet-based image compression process that uses dithered quantization. In our method, the second-order moment of the quantization noise is ...
    • Adaptive weighing of context models for lossless data compression 

      Mahoney, Matthew V. (2005-12-21)
      Until recently the state of the art in lossless data compression was prediction by partial match (PPM). A PPM model estimates the next-symbol probability distribution by combining statistics from the longest matching ...