Browsing Research Articles (Physics) by Title

Now showing items 403-422 of 510

    • The Q/U imaging experiment instrument 

      Biscoff, C.; Brizius, A.; Zwart, J.; Buder, I.; Chinone, Y.; Cleary, K.; Dumoulin, R.N.; Kusaka, A.; Monsalve, R.; Naess, S.K.; Newburgh, L.B.; Nixon, G.; Reeves, R.; Smith, K.M.; Vanderlinde, K.; Wehus, I.K.; Bogdan, M.; Bustos, R.; Church, S.E.; Davis, Robert; Dickenson, C.; Eriksen, H.K.; Gaier, T.; Gundersen, J.O.; Hasegawa, M.; Hazumi, M.; Holler, C.; Huffenberger, K.M.; Imbriale, W.A.; Ishidoshiro, K.; Jones, M.E.; Kangaslahti, P.; Kapner, D.J.; Lawrence, C.R.; Leitch, E.M.; Limon, M.; McMahon, J.J.; Miller, A.D.; Nagai, M.; Nguyen, H.; Pearson, T.J.; Piccirillo, L.; Radford, S.J.E.; Readhead, A.C.S.; Richards, J.L.; Samtleben, D.; Seiffert, M.; Shepherd, M.C.; Staggs, S.T.; Tajima, O.; Thompson, K.L.; Williamson, R.; Winstein, B.; Wollack, E.J. (The American Astronomical Society, 2013)
      The Q/U Imaging ExperimenT (QUIET) is designed to measure polarization in the cosmic microwave background, targeting the imprint of inflationary gravitational waves at large angular scales(∼1◦). Between 2008 October and ...

    • Quadrupole and octupole collectivity in the semi-magic nucleus 80206Hg126 

      Morrison, L. N.; Hadynska, K.; O'Neill, George G. (Elsevier, 2023)
      The first low-energy Coulomb-excitation measurement of the radioactive, semi-magic, two proton-hole nucleus 206Hg, was performed at CERN's recently-commissioned HIE-ISOLDE facility. Two γ rays depopulating low-lying states ...

    • Qualitatively different ways of unpacking visual representations when teaching intermolecular forces in upper secondary school 

      Patron, Emelie; Linder, Cedric; Wikman, Susanne (Wiley, 2021)
      Since visual representations play a particularly important role in the teaching and learning of chemistry, the ex-ploration described in this article focuses on them. This is an explorative study of the qualitatively ...

    • Quantifying and incentivizing exploration of reputable sources for argument formation in an online discussion forum 

      Square, Lynndle; van der Heyde, V.; Smith, D. (Academic Conferences and Publishing International Limited, 2021)
      Nuclearpowerformspartofthefirst-yearphysicsundergraduatecourseworkinthe extended curriculum program at the University of the Western Cape. This investigation intendstoassiststudentsinmasteringtheirunderstandingof ...

    • A quantitative in-depth analysis of the prototype sdB+BD system SDSS J08205+0008 revisited in the Gaia era 

      Kilkenny, D; Schaffenroth, V; Casewell, S.L (Oxford University Press, 2021)
      Subdwarf B stars are core-helium-burning stars located on the extreme horizontal branch (EHB). Extensive mass loss on the red giant branch is necessary to form them. It has been proposed that substellar companions could ...

    • Quantum dot-sensitised estrogen receptor-α-based biosensor for 17β-estradiol 

      Jijana, Abongile N.; Feleni, Usisipho; Ndangili, Peter M.; Bilibana, Mawethu; Ajayi, Rachel F (MDPI, 2023)
      : 17β-estradiol (E2) is an important natural female hormone that is also classified as an estrogenic endocrine-disrupting compound (e-EDC). It is, however, known to cause more damaging health effects compared to other ...

    • Quijote-png: Quasi-maximum likelihood estimation of primordial non-gaussianity in the nonlinear dark matter density field 

      Jung, Gabriel; Karagiannis, Dionysios; Liguori, Michele (American Astronomical Society, 2022)
      Future large-scale structure surveys are expected to improve current bounds on primordial non-Gaussianity (PNG), with a significant impact on our understanding of early universe physics. The level of such improvements ...

    • Quijote-png: Simulations of primordial non-gaussianity and the information content of the matter field power spectrum and bispectrum 

      Coulton, William R; Villaescusa-Navarro, Francisco; Karagiannis, Dionysios (IOP Publishing, 2023)
      Primordial non-Gaussianity (PNG) is one of the most powerful probes of the early universe, and measurements of the large-scale structure of the universe have the potential to transform our understanding of this area. ...

    • Quijote-png: The information content of the halo power spectrum and bispectrum 

      Coulton, William R; Villaescusa-Navarro, Francisco; Karagiannis, Dionysios (IOP Publishing, 2023)
      We investigate how much can be learnt about four types of primordial non-Gaussianity (PNG) from small-scale measurements of the halo field. Using the QUIJOTE-PNG simulations, we quantify the information content accessible ...

    • Radio continuum surveys with square kilometre array pathfinders 

      Norris, Ray P.; Afonso, J.; Bacon, David; Cress, Catherine (Cambridge University Press, 2013)
      In the lead-up to the Square Kilometre Array (SKA) project, several next-generation radio telescopes and upgrades are already being built around the world. These include APERTIF (The Netherlands), ASKAP (Australia), ...

    • Radio-loud active calactic nucleus: is there a link between luminosity and cluster environment? 

      Ineson, J.; Croston, J. H.; Jarvis, Matt; Hardcastle, M.J.; Evans, D. A.; Kraft, R. P. (American Physical Society, 2013)
      We present here the first results from the Chandra ERA (Environments of Radio-loud AGN) Large Project, characterizing the cluster environments of a sample of 26 radio-loud active galactic nuclei (AGNs) at z ∼ 0.5 that ...

    • Radon-222 measurements at Cape Point: A characterization of a 15-year time series 

      Botha, R.; Labuschagne, C.; Williams, A.G.; Bosman, G.; Brunke, E.-G.; Rossouw, A.; Lindsay, R. (National Association for Clean Air, 2018)
      The Cape Point (CPT) Global Atmosphere Watch (GAW) research station have been monitoring climatically significant trace gases for four decades. Among these is radon, a naturally occurring noble gas with a large continental ...

    • A real time processing system for big data in astronomy: Applications to Hera 

      La Plante, Paul; Williams, Peter KG; Kittiwisit, Piyanat (Elsevier, 2021)
      As current- and next-generation astronomical instruments come online, they will generate an unprecedented deluge of data. Analyzing these data in real time presents unique conceptual and computational challenges, and their ...

    • Recalibrating the Wide-field Infrared Survey Explorer (WISE) W4 Filter 

      Brown, M J I; Cluver, M E; Jarrett, T H (Cambridge University Press, 2014)
      We present a revised effective wavelength and photometric calibration for the Wide-field Infrared Survey Explorer W4 band, including tests of empirically motivated modifications to its pre-launch laboratory-measured ...

    • Reconstruction of dark energy and expansion dynamics using Gaussian processes 

      Seikel, Marina; Clarkson, Chris (IOP Publishing, 2012)
      An important issue in cosmology is reconstructing the effective dark energy equation of state directly from observations. With few physically motivated models, future dark energy studies cannot only be based on constraining ...

    • Recursion relations for gravitational lensing 

      Clarkson, Chris; Normann, Ben David (Springer Nature, 2019)
      The weak gravitational lensing formalism can be extended to the strong lensing regime by integrating a nonlinear version of the geodesic deviation equation. The resulting ‘roulette’ expansion generalises the notion of ...

    • Redshift evolution of galaxy group X-ray properties in the SIMBA simulations 

      Robson, Dylan; Dave, Romeel (Oxford University Press, 2023)
      We examine the evolution of intragroup gas rest-frame X-ray scaling relations for group-sized haloes (M500 = 1012.3–1015 M) in the SIMBA galaxy formation simulation. X-ray luminosity LX versus M500 shows increasing deviation ...

    • The redshift evolution of the baryonic Tully-Fisher relation in SIMBA 

      Glowacki, M; Elson, E; Dav´e, R (Oxford university press, 2021)
      The baryonic Tully–Fisher relation (BTFR) is an important tool for constraining galaxy evolution models. As 21-cm HI emission studies have been largely restricted to low redshifts, the redshift evolution of the BTFR is ...

    • Reflectivity of VUV-sensitive silicon photomultipliers in liquid Xenon 

      Schneider, J.; Ziegler, T.; Wagenpfeil, M. (IOP Publishing, 2021)
      Silicon photomultipliers are regarded as a very promising technology for nextgeneration, cutting-edge detectors for low-background experiments in particle physics. This work presents systematic reflectivity studies of ...

    • The relation between the diffuse X-ray luminosity and the radio power of the central AGN in galaxy groups 

      Jarvis, M.; Pasini, T.; Bruggen, M. (Oxford University Press, 2020)
      Our understanding of how active galactic nucleus feedback operates in galaxy clusters has improved in recent years owing to large efforts in multiwavelength observations and hydrodynamical simulations. However, it is much ...