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Asteroseismology of Massive Stars with the TESS Mission: The Runaway β Cep Pulsator PHL 346 = HN Aqr
(The Astrophysical journal letter, 2019)
We report an analysis of the first known β Cep pulsator observed by the Transiting Exoplanet Survey Satellite (TESS) mission, the runaway star PHL 346 = HN Aqr. The star, previously known as a singly periodic pulsator, has ...
Cosmological constraints on post-Newtonian parameters in effectively massless scalar-tensor theories of gravity
(2019)
We study the cosmological constraints on the variation of Newton’s constant and on post-Newtonian
parameters for simple models of the scalar-tensor theory of gravity beyond the extended Jordan-BransDicke theory. We restrict ...
Energy-momentum tensor and helicity for gauge fields coupled to a pseudoscalar inflaton
(University of the Western Cape, 2019)
We study the energy-momentum tensor and helicity of gauge fields coupled through $g \phi F \tilde{F}/4$ to a pseudo-scalar field $\phi$ driving inflation. Under the assumption of a constant time derivative of the background ...
Cold-pressing and vacuum arc melting of γ-tial based alloys
(ScienceDirect, 2019)
eta (β) solidifying γ-TiAl intermetallic alloys of nominal composition Ti-48Al, Ti-48Al-2Nb, Ti-48Al-2Nb-0.7Cr alloys have been cold pressed and vacuum arc melted. The Al loss was due to compaction method used prior to the ...
Rotational structures in 196Hg
(University of the Western Cape, 2019)
High spin states in 196 Hg were populated in the 198 Pt (α,6n) reaction at 65 MeV and γ
−γ coincidence measurements were performed using the AFRODITE array at iThemba LABS. The level scheme was extended and new rotational ...
Comparing galaxy clustering in horizon-agn simulated light-cone mocks and video observations
(Oxford University Press, 2019-04-12)
Hydrodynamical cosmological simulations have recently made great advances in reproducing
galaxy mass assembly over cosmic time – as often quantified from the comparison of their
predicted stellar mass functions to observed ...
Comparing galaxy clustering in horizon-agn simulated light-cone mocks and video observations
(Oxford academic, 2019)
Hydrodynamical cosmological simulations have recently made great advances in reproducing
galaxy mass assembly over cosmic time – as often quantified from the comparison of their
predicted stellar mass functions to observed ...
Nitrogen plasma treatment of zno and tio2 nanowire arrays for polymer photovoltaic applicationS
(ScienceDirect, 2019)
This work reports on a simple, yet unique approach to improving the opto-electronic properties of vertically-aligned arrays of rutile TiO2 and Wurzite ZnO nanowires by means of controlled nitrogen doping during exposure ...
Mergers, starbursts, and quenching in the SIMBA simulation
(Oxford Academic, 2019)
We use the SIMBAcosmological galaxy formation simulation to investigate the relationship
between major mergers (4:1), starbursts, and galaxy quenching. Mergers are identified via
sudden jumps in stellar mass M∗ well above ...
Effect of the annealing atmosphere on the layer interdiffusion in Pd/Ti/Pd multilayer stacks deposited on pure Ti and Ti-alloy substrates
(University of the Western Cape, 2019)
Pd(50 nm)/Ti(25 nm)/Pd(50 nm) multilayer stack has been deposited on Ti and Ti6Al4V substrates; we have studied the intermixing of layers upon annealing at the hydrogenation temperature of 550 °C, under vacuum, H/Ar gas ...