Listar Ciencias Exactas y Naturales por título

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    • Weak turbulence theory for collisional plasmas 

      Yoon, Peter H.; Ziebell, Luiz Fernando; Kontar, Eduard; Schlickeiser, Reinhard (2016) [Artículo de periódico]
      Plasma is an ionized gas inwhich the collective behavior dominates over the individual particle interactions. For this reason, plasma is often treated as collisionless or collision-free. However, the discrete nature of the ...

    • Wear resistance of plasma electrolytic oxidation coatings on Ti-6Al-4V ELI alloy processed by additive manufacturing 

      Santos, Pedro Bell; Castro, Victor Velho de; Baldin, Estela Knopp Kerstner; Aguzzoli, Cesar; Longhitano, Guilherme Arthur; Munhoz, André Luiz Jardini; Lopes, Éder Sócrates Najar; Andrade, Antonio Marcos Helgueira de; Malfatti, Célia de Fraga (2022) [Artículo de periódico]
      The additive manufacturing (AM) technique can produce Ti-6Al-4V ELI (extra low interstitial) alloy for personalized biomedical devices. However, the Ti-6Al-4V ELI alloy presents poor tribological behavior. Regarding this, ...

    • Weight-balanced measures and free energy for one-dimensional dynamics 

      Lopes, Artur Oscar; Whiters, W. Douglas (1993) [Artículo de periódico]
      In this paper we consider Thermodynamic Formalism propcrties o fone dimensional maps. Wc consider the existence ofweight-balanced measures and large dcviation propcrtics o f the Frcc-Encrgy of the Jacobian of measures. We ...

    • What determines sclerobiont colonization on marine mollusk shells? 

      Agostini, Vanessa Ochi; Ritter, Matias do Nascimento; Macedo, Alexandre José; Muxagata, Erik; Erthal, Fernando (2017) [Artículo de periódico]
      Empty mollusk shells may act as colonization surfaces for sclerobionts depending on the physical, chemical, and biological attributes of the shells. However, the main factors that can affect the establishment of an organism ...

    • What drives the velocity dispersion of ionized gas in star-forming galaxies? 

      Yu, Xiaoling; Shi, Yong; Chen, Yanmei; Law, David R.; Bizyaev, D.; Bing, Longji; Li, Songlin; Zhou, Luwenjia; Chen, Jianhang; Riffel, Rogemar André; Riffel, Rogério; Zhang, Kai; Chen, Yongyun; Pan, K. (2019) [Artículo de periódico]
      We analyse the intrinsic velocity dispersion properties of 648 star-forming galaxies observed by the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey, to explore the relation of intrinsic gas velocity ...

    • What happened to the gas-liquid transition in the system of dipolar hard spheres? 

      Levin, Yan (1999) [Artículo de periódico]
      We explore the equilibrium properties of a system composed of dipolar hard spheres. A new theory based on the ideas derived from the work of Debye and Hückel, Bjerrum, and Onsager is proposed to explain the absence of the ...

    • White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 14 

      Kepler, Souza Oliveira; Pelisoli, Ingrid Domingos; Koester, Detlev; Reindl, Nicole; Geier, Stephan; Romero, Alejandra Daniela; Ourique, Gustavo; Oliveira, Cristiane de Paula; Amaral, Larissa Antunes (2019) [Artículo de periódico]
      White dwarfs carry information on the structure and evolution of the Galaxy, especially through their luminosity function and initial-to-final mass relation. Very cool white dwarfs provide insight into the early ages of ...

    • White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 16 

      Kepler, Souza Oliveira; Koester, Detlev; Pelisoli, Ingrid Domingos; Romero, Alejandra Daniela; Ourique, Gustavo (2021) [Artículo de periódico]
      White dwarfs are the end state of the evolution of more than 97 per cent of all stars, and therefore carry information on the structure and evolution of the Galaxy through their luminosity function and initial-to-final ...

    • White dwarf luminosity and mass functions from sloan digital sky survey spectra 

      DeGennaro, Steven; Hippel, Ted von; Winget, Donald Earl; Kepler, Souza Oliveira; Nitta, Atsuko (2008) [Artículo de periódico]
      We present the first phase in our ongoing work to use Sloan Digital Sky Survey (SDSS) data to create separate white dwarf (WD) luminosity functions (LFs) for two or more different mass ranges. In this paper, we determine ...

    • White dwarf mass distribution in the SDSS 

      Kepler, Souza Oliveira; Kleinman, Scot James; Nitta, Atsuko; Koester, Detlev; Castanheira, Bárbara Garcia; Giovannini Junior, Odilon; Costa, Alex Fabiano Murillo da; Althaus, Leandro Gabriel (2007) [Artículo de periódico]
      We determined masses for the 7167 DA and 507 DB white dwarf stars classified as single and non-magnetic in Data Release 4 of the Sloan Digital Sky Survey (SDSS). We obtained revised Teff and log g determinations for the ...

    • White dwarf variability with gPhoton : pulsators 

      Tucker, Michael A.; Fleming, S.W.; Pelisoli, Ingrid Domingos; Romero, Alejandra Daniela; Bell, Keaton; Kepler, Souza Oliveira; Caton, Daniel B.; Debes, John; Montgomery, Michael Houston; Thompson, S. E.; Koester, Detlev; Million, Chase; Shiao, Bernie (2018) [Artículo de periódico]
      We present results from a search for short time-scale white dwarf variability using gPhoton, a time-tagged data base of GALEX photon events and associated software package. We conducted a survey of 320 white dwarf stars ...

    • White paper on forward physics, BFKL, saturation physics and diffraction 

      Hentschinski, Martin; Silveira, Gustavo Gil da; Wallon, Samuel (2023) [Artículo de periódico]
      The goal of this white paper is to give a comprehensive overview of the rich field of forward physics. We discuss the occurrences of BFKL re-summation effects in special final states, such as Mueller–Navelet jets, jet–gap–jets, ...

    • A Whole Earth Telescope campaign on the pulsating subdwarf B binary system PG 1336-018 (NY Vir) 

      Kilkenny, Dave; Reed, M. D.; O'Donoghue, Darragh; Kawaler, Steven D.; Mukadam, Anjum Shagufta; Kleinman, Scot James; Nitta, Atsuko; Metcalfe, Travis S.; Provencal, Judith L.; Watson, Todd K.; Sullivan, Denis J.; Sullivan, Terry; Shobbrook, Robert R.; Jiang, Xiaojun; Joshi, Santosh; Ashoka, B.N.; Seetha, S.; Leibowitz, Elia M.; Ibbetson, Peter A.; Mendelson, Haim; Meistas, Edmundas G.; Kalytis, Romualdas; Alisauskas, Darius; Martinez, Peter; Van Wyk, Francois; Stobie, Robert S.; Marang, Fred; Zola, Staszek; Krzesinski, Jerzy; Ogloza, Waldemar; Moskalik, Pawel; Silvotti, Roberto; Piccioni, Adalberto; Vauclair, Gérard; Dolez, Noël; Chevreton, Michel; Dreizler, Stefan; Schuh, Sonja L.; Deetjen, Jochen L.; Solheim, Jan-Eric; Gonzalez Perez, Jose Miguel; Ulla, Ana; Ostensen, Roy; Manteiga, Minia; Suarez, Olga; Burleigh, Matt; Kepler, Souza Oliveira; Kanaan Neto, Antonio Nemer; Giovannini Junior, Odilon (2003) [Artículo de periódico]
      We present results from a multisite (‘Whole Earth Telescope’) photometric campaign on PG 1336−018, the close eclipsing binary system containing a pulsating subdwarf B (sdB) star. The main part of the campaign (1999 April) ...

    • Whole earth telescope observations and seismological analysis of the cool zz ceti star gd 154 

      Pfeiffer, Ben; Vauclair, Gérard; Dolez, Noël; Chevreton, Michel; Fremy, J. R.; Barstow, Martin A.; Belmonte, J.A.; Kepler, Souza Oliveira; Kanaan Neto, Antonio Nemer; Giovannini Junior, Odilon; Fontaine, Gilles; Bergeron, Pierre; Wesemael, F.; Grauer, Albert D.; Nather, R. Edward; Winget, Donald Earl; Provencal, Judith L.; Clemens, J. Christopher; Bradley, Paul A.; Dixson, James S.; Kleinman, Scot James; Watson, Todd K.; Claver, C.F.; Matzeh, Tsevi; Leibowitz, Elia M.; Moskalik, Pawel (1996) [Artículo de periódico]
      This paper presents the results of high speed photometric observations of the cool variable DA white dwarf (DAV) GD 154 obtained with the Whole Earth Telescope. GD 154 is one of the coolest pulsating DA white dwarfs and ...

    • Whole Earth Telescope observations and seismological analysis of the pre-white dwarf pg 2131+066 

      Kawaler, Steven D.; O'Brien, M. Sean; Clemens, J. Christopher; Nather, R. Edward; Winget, Donald Earl; Watson, Todd K.; Yanagida, K.; Dixson, James S.; Bradley, Paul A.; Wood, Matthew A.; Sullivan, Denis J.; Kleinman, Scot James; Meistas, Edmundas G.; Leibowitz, Elia M.; Moskalik, Pawel; Zola, Staszek; Pajdosz, Y.; Krzesinski, Jerzy; Solheim, Jan-Eric; Bruvold, A.; O'Donoghue, Darragh; Katz, M.; Vauclair, Gérard; Dolez, Noël; Chevreton, Michel; Barstow, Martin A.; Kanaan Neto, Antonio Nemer; Kepler, Souza Oliveira; Giovannini Junior, Odilon; Provencal, Judith L.; Hansen, Carl J. (1995) [Artículo de periódico]
      As transition objects between the asymptotic giant branch (AGB) and cooling white dwarfs, the PG 1159 stars are key objects for understanding the late stages of stellar evolution. The pulsations exhibited by many members ...

    • Whole earth telescope observations of am canum venaticorum-discoseismology at last 

      Solheim, Jan-Eric; Provencal, Judith L.; Bradley, Paul A.; Vauclair, Gérard; Barstow, Martin A.; Kepler, Souza Oliveira; Fontaine, Gilles; Graver, A.D.; Winget, Donald Earl; Marar, T.M. Krishnan; Leibowitz, Elia M.; Enanvelsen, P.I.; Chevreton, Michel; Dolez, Noël; Kanaan Neto, Antonio Nemer; Bergeron, Pierre; Claver, C.F.; Clemens, J. Christopher; Kleinman, Scot James; Hine, B.P.; Seetha, S.; Shoka, B.N.; Mazeh, Tsevi; Sansom, A.E.; Tweedy, P.W.; Meistas, Edmundas G.; Bruvold, A.; Massacand, C.N. (1998) [Artículo de periódico]
      We report the results of 143.2 hours of time-series photometry over a 12 day period for AM CVn (= HZ 29) as part of the Whole Earth Telescope (WET) project.ˡ This star is believed to be an ultra-short period cataclysmic ...

    • Whole Earth Telescope observations of BPM 37093 : a seismological test of crystallization theory in white dwarfs 

      Kanaan Neto, Antonio Nemer; Nitta, Atsuko; Winget, Donald Earl; Kepler, Souza Oliveira; Montgomery, Michael Houston; Metcalfe, Travis S.; Oliveira, H.; Fraga, Luciano; Costa, Alex Fabiano Murillo da; Costa, Jose Eduardo da Silveira; Castanheira, Bárbara Garcia; Giovannini Junior, Odilon; Nather, R. Edward; Mukadam, Anjum Shagufta; Kawaler, Steven D.; O'Brien, M. Sean; Reed, M. D.; Kleinman, Scot James; Provencal, Judith L.; Watson, Todd K.; Kilkenny, Dave; Sullivan, Denis J.; Sullivan, Terry; Shobbrook, Bob; Jiang, Xiaojun; Ashoka, B.N.; Seetha, S.; Leibowitz, Elia M.; Ibbetson, Peter A.; Mendelson, Haim; Meistas, Edmundas G.; Kalytis, Romualdas; Alisauskas, Darius; O'Donoghue, Darragh; Buckley, David A.H.; Martinez, Peter; Van Wyk, Francois; Stobie, Robert S.; Marang, Fred; Van Zyl, L.; Ogloza, Waldemar; Krzesinski, Jerzy; Zola, Staszek; Moskalik, Pawel; Breger, M.; Stankov, A.; Silvotti, Roberto; Piccioni, Adalberto; Vauclair, Gérard; Dolez, Noël; Chevreton, Michel; Deetjen, Jochen L.; Dreizler, Stefan; Schuh, Sonja L.; Gonzalez Perez, Jose Miguel; Ostensen, Roy; Ulla, Ana; Manteiga, Minia; Suarez, Olga; Burleigh, Matt; Barstow, Martin A. (2005) [Artículo de periódico]
      BPM 37093 is the only hydrogen-atmosphere white dwarf currently known which has sufficient mass (~1.1 Mʘ) to theoretically crystallize while still inside the ZZ Ceti instability strip (Teff ~ 12 000 K). As a consequence, ...

    • Whole Earth Telescope observations of the DAV white dwarf G226-29 

      Kepler, Souza Oliveira; Giovannini Junior, Odilon; Wood, Matthew A.; Nather, R. Edward; Winget, Donald Earl; Kanaan Neto, Antonio Nemer; Kleinman, Scot James; Bradley, Paul A.; Provencal, Judith L.; Clemens, J. Christopher; Claver, C.F.; Watson, Todd K.; Yanagida, K.; Krisciunas, K.; Marar, T.M. Krishnan; Seetha, S.; Ashoka, B.N.; Leibowitz, Elia M.; Mendelson, Haim; Mazeh, Tsevi; Moskalik, Pawel; Krzesinski, Jerzy; Pajdosz, Y.; Zola, Staszek; Solheim, Jan-Eric; Emanuelsen, P.-I.; Dolez, Noël; Vauclair, Gérard; Chevreton, Michel; Fremy, J. R.; Barstow, Martin A.; Sansom, A.E.; Tweedy, R.W.; Wickramasinghe, D.T.; Ferrario, Lilia; Sullivan, Denis J.; Peet, A.J. van der; Buckley, David A.H.; Chen, A.-L. (1995) [Artículo de periódico]
      We observed G226-29 for 121 hr in 1992 February and confirm the presence of the three previously identified frequencies close to 109 s. We find no evidence of other pulsation periods down to our noise level of about 0.35 ...

    • Whole Earth Telescope observations of the DBV white dwarf GD 358 

      Winget, Donald Earl; Nather, R. Edward; Clemens, J. Christopher; Provencal, Judith L.; Kleinman, Scot James; Bradley, Paul A.; Claver, C.F.; Dixson, James S.; Montgomery, Michael Houston; Hansen, Carl J.; Hine, B.P.; Birch, P.; Candy, M.; Marar, T.M. Krishnan; Seetha, S.; Ashoka, B.N.; Leibowitz, Elia M.; O'Donoghue, Darragh; Warner, B.; Buckley, David A.H.; Tripe, P.; Vauclair, Gérard; Dolez, Noël; Chevreton, Michel; Serre, T.; Garrido, R.; Kepler, Souza Oliveira; Kanaan Neto, Antonio Nemer; Augusteijn, T.; Wood, Matthew A.; Bergeron, Pierre; Grauer, Albert D. (1994) [Artículo de periódico]
      We report on the analysis of 154 hours of early continuous high-speed photometry on the pulsating DB white dwarf (DBV) GD 358, obtained during the Whole Earth Telescope (WET) run of 1990 May. The power spectrum of the light ...

    • Whole Earth Telescope observations of the helium interacting binary PG 1346+082 (CR bootis) 

      Provencal, Judith L.; Winget, Donald Earl; Nather, R. Edward; Robinson, E.L.; Clemens, J. Christopher; Bradley, Paul A.; Claver, C.F.; Kleinman, Scot James; Grauer, Albert D.; Hine, B.P.; Ferrario, Lilia; O'Donoghue, Darragh; Warner, B.; Vauclair, Gérard; Chevreton, Michel; Kepler, Souza Oliveira; Wood, Matthew A.; Henry, G.W. (1997) [Artículo de periódico]
      We present our analysis of 240 hr of white-light, high-speed photometry of the dwarf nova-like helium variable PG 1346+082 (CR Boo). We identify two frequencies in the low-state power spectrum, at 679.670±0.004 μHz and ...