University of Johannesburg

About: University of Johannesburg is a education organization based out in Johannesburg, South Africa. It is known for research contribution in the topics: Population & Context (language use). The organization has 8070 authors who have published 22749 publications receiving 329408 citations. The organization is also known as: UJ.

Technology Transfer? The Rise of China and India in Green Technology Sectors

Abstract: International technology transfer is central to the debate about how to curb the carbon emissions from rapid economic growth in China and India. But given China and India’s great progress in building innovation capabilities and green industries, how relevant is technology transfer for these countries? This paper seeks insights from three green technology sectors in both countries: wind power, solar energy and electric and hybrid vehicles. We find that conventional technology transfer mechanisms such as foreign direct investments and licensing were important for industry formation and take-off. However, as these sectors are catching up, new ‘unconventional transfer mechanisms’ such as R&D partnerships and acquisition of foreign firms have become increasingly important. We argue that there is limited practical and analytical mileage left in the conventional approach to technology transfer in these sectors in China and India. We argue that the emphasis should shift from transfer of mitigation technology to international collaboration and local innovation.

Measurement of the inclusive isolated prompt photon cross section in pp collisions at √s=7TeV with the ATLAS detector

Abstract: A measurement of the cross section for the inclusive production of isolated prompt photons in pp collisions at a center-of-mass energy root s = 7 TeV is presented. The measurement covers the pseudorapidity ranges vertical bar eta(gamma)vertical bar < 1: 37 and 1: 52 <= vertical bar eta(gamma)vertical bar < 1: 81 in the transverse energy range 15 <= E-T(gamma) < 100 GeV. The results are based on an integrated luminosity of 880 nb(-1), collected with the ATLAS detector at the Large Hadron Collider. Photon candidates are identified by combining information from the calorimeters and from the inner tracker. Residual background in the selected sample is estimated from data based on the observed distribution of the transverse isolation energy in a narrow cone around the photon candidate. The results are compared to predictions from next-to-leading-order perturbative QCD calculations.

Crystalline Electric-Field Randomness in the Triangular Lattice Spin-Liquid YbMgGaO4

Abstract: We apply moderate-high-energy inelastic neutron scattering (INS) measurements to investigate ${\mathrm{Yb}}^{3+}$ crystalline electric field (CEF) levels in the triangular spin-liquid candidate ${\mathrm{YbMgGaO}}_{4}$. Three CEF excitations from the ground-state Kramers doublet are centered at the energies $\ensuremath{\hbar}\ensuremath{\omega}=39$, 61, and 97 meV in agreement with the effective spin-$1/2$ $g$ factors and experimental heat capacity, but reveal sizable broadening. We argue that this broadening originates from the site mixing between ${\mathrm{Mg}}^{2+}$ and ${\mathrm{Ga}}^{3+}$ giving rise to a distribution of Yb-O distances and orientations and, thus, of CEF parameters that account for the peculiar energy profile of the CEF excitations. The CEF randomness gives rise to a distribution of the effective spin-$1/2$ $g$ factors and explains the unprecedented broadening of low-energy magnetic excitations in the fully polarized ferromagnetic phase of ${\mathrm{YbMgGaO}}_{4}$, although a distribution of magnetic couplings due to the $\mathrm{Mg}/\mathrm{Ga}$ disorder may be important as well.

Search for neutral Higgs bosons of the minimal supersymmetric standard model in pp collisions at √s=8 TeV with the ATLAS detector

Abstract: A search for the neutral Higgs bosons predicted by the Minimal Supersymmetric Standard Model (MSSM) is reported. The analysis is performed on data from proton-proton collisions at a centre-of-mass energy of 8 TeV collected with the ATLAS detector at the Large Hadron Collider. The samples used for this search were collected in 2012 and correspond to integrated luminosities in the range 19.5-20.3 fb−1. The MSSM Higgs bosons are searched for in the τ τ final state. No significant excess over the expected background is observed, and exclusion limits are derived for the production cross section times branching fraction of a scalar particle as a function of its mass. The results are also interpreted in the MSSM parameter space for various benchmark scenarios.