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3972. Life trajectories of three professors of the University of Ljubljana : The impact of the Second World War on their careersŽeljko Oset, 2018, published scientific conference contribution abstract (invited lecture) Abstract: The paper focuses on careers and life trajectories of three university professor of University of Ljubljana: Fran Ramovš (1890-1952, slavicist, assistant professor in University of Graz – 1917-1918, a professor at the University of Ljubljana – 1919-1950, rector of the University of Ljubljana – 1934/1935, president of the Slovene Academy of Sciences and Arts – 1950-1952), Maks Samec (1881-1964, chemist, a professor at the University of Ljubljana – 1919-1945, rector of University of Ljubljana – 1935-1937, purged from the University after Second World War but later became head of the newly established Institute of Chemistry at the Slovene Academy of Sciences and Arts – 1946-1964) and Ljudmila Dolar Mantuani (1906-1988, geologist, in 1940 became Assistant Professor, and before the end of the war in 1945 emigrated to Canada where she established herself in the private sector.
Keywords: The University of Ljubljana, the Slovenian Academy of Sciences and Arts, academic freedom, World War II
Published in RUNG: 17.09.2018; Views: 3736; Downloads: 0
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3974. Volatile and sensory profiling of Shiraz wine in response to alcohol management: comparison of harvest timing versus technological approachesRocco Longo, John W. Blackman, Guillaume Antalick, Peter J. Torley, Suzy Y. Rogers, Leigh Schmidtke, 2018, original scientific article Keywords: Common Component Specific Weights Analysis, polypropylene membrane, sensory descriptive analysis, sequential harvest, volatiles, wine alcohol-reduction
Published in RUNG: 17.09.2018; Views: 3470; Downloads: 0
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3975. A comparative study of partial dealcoholisation versus early harvest: Effects on wine volatile and sensory profilesRocco Longo, John.W Blackman, Guillaume Antalick, Peter J. Torley, Suzy.Y Rogers, Leigh Schmidtke, 2018, original scientific article Keywords: Common component and specific weights analysis, Dealcoholisation, Early harvest, Evaporative perstraction, Lower alcohol wine, Reverse osmosis, Sensory descriptive analysis, Wine
Published in RUNG: 17.09.2018; Views: 3532; Downloads: 0
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3980. Sulfur based batteries studied by in-operando S K-edge RIXS and XAS spectroscopyMatjaž Kavčič, Ana Robba, Janez Bitenc, Alen Vižintin, Iztok Arčon, Matjaž Žitnik, Klemen Bučar, Robert Dominko, 2018, published scientific conference contribution abstract Abstract: Sulfur based batteries are considered as very attractive energy storage devices. Sulfur is one of the most abundant elements in the earth, it is electrochemically active material which can accept up to two electrons per atom. In combination with alkali metals, sulfur forms electrochemical couples with much higher theoretical energy density compared to Li-ion batteries commonly available today. At the moment, the electrochemical couple with Li is most extensively studied. While the main principle of operation is known the relevant operation mechanism(s) is not completely clear. Even more promising is the electrochemical couple with Mg providing almost twofold higher volumetric energy density due to its ability to provide two electrons during oxidation. However, Mg-S batteries are still in the very early stage of research and development and the complex mechanism of sulfur conversion has been less extensively studied.
In order to improve the understanding of sulfur electrochemical conversion and its interactions within electrode, we need to apply new experimental approaches capable to provide precise information about local environment of S in the cathode during battery operation. In our work, resonant inelastic X-ray scattering (RIXS) and XAS measurements at the sulfur K-edge performed in operando mode were used to study the lithium-polysulfide formation during the discharge process. Measurements were performed at ID26 beamline of the ESRF synchrotron using tender X-ray emission spectrometer [1]. Resonant excitation condition enhanced the sensitivity for the lithium−polysulfide detection. On the other hand, the sulfate signal from the electrolyte was heavily suppressed and the self-absorption effects minimized due to fixed excitation energy.
This experimental methodology was used to provide quantitative analysis of sulfur compounds in the cathode of a Li−S battery cell during the discharge process [2]. The high-voltage plateau in the discharge curve was characterized by a rapid conversion of solid sulfur into liquid phase Li polysulfides reaching its maximum at the end of this plateau. At this point the starting point for the precipitation of the Li2S from the liquid polysulfide phase was observed. The same approach has been used also for the Mg-S battery revealing similar mechanism as in case of Li-S battery [3]. The electrochemical conversion of sulfur with magnesium proceeds through two well-defined plateaus, which correspond to the equilibrium between sulfur and Mg polysulfides (high-voltage plateau) and polysulfides and MgS (low-voltage plateau).
Keywords: Mg-Sulphur batteries, XANES, RIXS
Published in RUNG: 13.09.2018; Views: 4547; Downloads: 0
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