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The Sloan Digital Sky Survey Quasar Catalog: Fourteenth data release
Pâ,ris, Isabelle,Petitjean, Patrick,Aubourg, É,ric,Myers, Adam D.,Streblyanska, Alina,Lyke, Brad W.,Anderson, Scott F.,Armengaud, É,ric,Bautista, Julian,Blanton, Michael R.,Blomqvist, Springer-Verlag 2018 Astronomy and astrophysics Vol.613 No.-
<P>We present the data release 14 Quasar catalog (DR14Q) from the extended Baryon Oscillation Spectroscopic Survey (eBOSS) of the Sloan Digital Sky Survey IV (SDSS-IV). This catalog includes all SDSS-IV/eBOSS objects that were spectroscopically targeted as quasar candidates and that are confirmed as quasars via a new automated procedure combined with a partial visual inspection of spectra, have luminosities <I>M</I>i [<I>z</I> = 2] < −20.5 (in a Λ CDM cosmology with <I>H</I>0 = 70 km s<SUP>−1</SUP> Mpc<SUP>−1</SUP>, Ω M =0.3, and Ω Λ = 0.7), and either display at least one emission line with a full width at half maximum larger than 500 km s<SUP>−1</SUP> or, if not, have interesting/complex absorption features. The catalog also includes previously spectroscopically-confirmed quasars from SDSS-I, II, and III. The catalog contains 526 356 quasars (144 046 are new discoveries since the beginning of SDSS-IV) detected over 9376 deg<SUP>2</SUP> (2044 deg<SUP>2</SUP> having new spectroscopic data available) with robust identification and redshift measured by a combination of principal component eigenspectra. The catalog is estimated to have about 0.5% contamination. Redshifts are provided for the Mg II emission line. The catalog identifies 21 877 broad absorption line quasars and lists their characteristics. For each object, the catalog presents five-band (<I>u</I>, <I>g</I>, <I>r</I>, <I>i</I>, <I>z</I>) CCD-based photometry with typical accuracy of 0.03 mag. The catalog also contains X-ray, ultraviolet, near-infrared, and radio emission properties of the quasars, when available, from other large-area surveys. The calibrated digital spectra, covering the wavelength region 3610-10 140 Å at a spectral resolution in the range 1300 < <I>R</I> < 2500, can be retrieved from the SDSS Science Archiver Server.</P>
Towards unraveling the sintering process of two polystyrene particles by numerical simulations
Caroline Balemans,Prakhyat Hejmady,Ruth Cardinaels,Patrick D. Anderson 한국유변학회 2019 Korea-Australia rheology journal Vol.31 No.4
In this work, we study different rheological and thermal phenomena present during laser sintering of two polystyrene (PS) particles using fully resolved numerical simulations. In our analysis, we varied the laser power, the initial temperature and the thermal convection coefficient, used different rheological descriptions for the flow behavior and in addition studied the effect of the substrate (used in the experiments) on the temperature distribution of the system. Although we are not able to fully describe the results of the experiments with our simulations for the given parameter set, we obtained important insights in the significance of thermal initial and boundary conditions by systematically studying the sintering process.
Application of a mapping method for mixing analysis of micromixers
강태곤(Tae Gon Kang),Mrityunjay K. Singh,Patrick D. Anderson,권태헌(Tai Hun Kwon),Han E.H. Meijer 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Under typical operating conditions, flows in microfluidic devices are laminar and molecular diffusion across the channels is slow, which makes an efficient mixing in microfluidic devices difficult to achieve. The mechanism to achieve effective mixing in laminar flows is that of repetitive stretching and folding. Essential is to generate spatially periodic flows with crossing cross sectional streamlines. A mapping method is employed to analyze mixing in micromixers, enabling us to investigate the progress of mixing both qualitatively and quantitatively. The progress of mixing is characterized by a measure of mixing, called the discrete intensity of segregation. The mapping method is applied to mixing in such micromixers as the staggered herringbone mixer, the barrier embedded micromixer, and the three-dimensional serpentine channel to demonstrate the capability of the numerical scheme to tackle general mixing problems in microfluidic devices.