IFE Brage (Institute for Energy Technology)
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Encouraging or expecting flexibility? How small business leaders’ mastery goal orientation influences employee flexibility through different work climate perceptions
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Interplay of valence states and magnetic interactions in the perovskite system LaNi1–xRhxO3
Get PDFWe report on the structural, magnetic and electronic properties of Rh substituted LaNiO3, LaNi1–xRhxO3 (0 ≤ x ≤ 1). Increased Rh contents are associated with increased structural distortion, and we observe a phase transformation and an immiscibility gap between 0.15 ≤ x ≤ 0.25, separating the R-3c and Pnma perovskite structure regimes. Structural evaluation by synchrotron X-ray diffraction, X-ray absorption spectroscopy and DC magnetic measurements suggest variations in oxidation state for the B-site cations, with Ni(II)/Rh(IV), in addition to Rh(III), dominating for high Rh-contents. Although ordering of Ni(II)/Rh(IV) is possible, no B-site ordering between Ni and Rh is observed for any composition. A metal-to-insulator transition occurs upon Rh-substitution, correlating with the structural transition. DC- and AC magnetic measurements reveal that several of the compositions are magnetically frustrated with both antiferro- and ferromagnetic behaviour at low temperatures. The antiferromagnetic interactions are dominating, while the ferromagnetic interactions increase with increasing Rh-content, to a maximum at x = 0.80 and x = 0.90 in LaNi1–xRhxO3. The mixed valence states are assumed to contribute with a ferromagnetic super-exchange interaction between Ni(II) and Rh(IV).acceptedVersio
Thermal stability and interactions with sedimentary rocks under typical reservoir conditions of selected pyridines investigated as phase partitioning tracers
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Investigating the validity of subjective workload rating (NASA TLX) and subjective situation awareness rating (SART) for cognitively complex human–machine work
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Upward and downward two-phase flow of in a pipe: Comparison between experimental data and model predictions
Get PDFIn order to deploy capture and storage (CCS) systems to mitigate climate change, it is crucial to develop reliable models for design and operational considerations. A key element of the system is the interface between transportation and storage, namely the injection well, where various transient scenarios involving multiphase flow will occur. In the literature there are very few data relevant for validation of vertical multiphase flow models for . Hence in this work, we present measurements of liquid holdup, pressure drop and flow regime for upward and downward flow of in a pipe of inner diameter 44mm at a pressure of 6.5MPa, a condition relevant for -injection wells. The experimental results indicate that the flow is close to no-slip. We have compared the experimental data to predictions by well-known models for phase slip and frictional pressure drop, and the results show that overall, the best model is the simplest one – the fully homogeneous approach, in which no slip is assumed and the friction is calculated simply by employing gas-liquid mixture properties in the single-phase friction model. Keywords carbon dioxideinjectionvertical flowfrictionliquid holdupfluid dynamicsthermodynamicspublishedVersio
