5,339 research outputs found
Carbidization and size effects of unsupported nanosized iron in the low temperature Fischer-Tropsch process
No full textIncludes abstract.Includes bibliographical references.In the process of developing the most efficient production of fuels from coal or natural gas, there have been major advances in the development of the catalysts used. Previous work at the Centre for Catalysis Research, at the University of Cape Town, has shown great potential and provided a much deeper under- standing of the workings of the Fischer-Tropsch catalyst. The research has found that the catalyst crystallite size plays a crucial part in the product selectivity and requires strict control in order to obtain a certain desired product spectrum. The aim of this project is to provide insight on the behavior of various iron oxide crystallite sizes when placed in a CO concentrated environment during catalyst pretreatment. It will also clarify whether the sizes of the nano-crystallites will increase or decrease when the different phases form and which size carbides faster
Thomas Kettle, The Open Secret of Ireland, with an introduction by J.E. Redmond
No full textEscarbelt Bernard. Thomas Kettle, The Open Secret of Ireland, with an introduction by J.E. Redmond. In: Études irlandaises, n°32 n°2, 2007. Les nouveaux irlandais, sous la direction de Karin Fischer et Anne Goarzin. pp. 207-208
Thomas Kettle, The Open Secret of Ireland, with an introduction by J.E. Redmond
No full textEscarbelt Bernard. Thomas Kettle, The Open Secret of Ireland, with an introduction by J.E. Redmond. In: Études irlandaises, n°32 n°2, 2007. Les nouveaux irlandais, sous la direction de Karin Fischer et Anne Goarzin. pp. 207-208
Fundamental understanding of re-dispersion of cobalt on supported model Fischer-Tropsch catalysts
No full textThe aim of this study was to investigate how the catalytically active material may redisperse during consecutive oxidation-reduction steps (OROR) for a model supported-cobalt catalyst to give insight into the regeneration process of a spent supported-cobalt FTS catalyst
The development of an in-situ X-ray diffraction cell for Fischer-Tropsch catalyst characterisation
No full textIncludes synopsis.Includes bibliographical references.In the current study, the successful development of a novel in-situ X-ray diffraction cell is described. This cell allows the direct observation of crystallite changes to be made under reaction conditions and in real time. The cell permits operation up to 500°C and 25 bar to be realised, with more severe conditions being achievable upon changing the reactor component. The design is such that it can be mounted to any commercial, laboratory-scale X-ray diffractometer or synchrotron facility
Operative Risk, nutritional assessment and intravenous support 24. Volume 1. Perioperative care of the surgical patient.
No full textRecommended from our members
Preliminary Geologic Map of the North Half of the Union Pass Quadrangle, Mohave County, Arizona
No full textPreliminary Geologic Map of the North Half of the Union Pass Quadrangle, Mohave County, Arizona. Includes one map sheet with cross section at 1:24,000 map scale.On 1/17/2014, F.L. Hillemeyer's name was removed from the author list per his request. (The request was forwarded to AZGS by J.E. Faulds.)Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact [email protected]
An enzymatic mechanism for calcium current inactivation in dialysed Helix neurones
No full text'Wash-out' and inactivation of the Ca current were examined in dialysed, voltage-clamped neurones of Helix aspersa under conditions that isolate the Ca current virtually free of other currents. EGTA or other internal Ca2+ chelators were routinely omitted from the dialysate. The time-dependent loss, or wash-out, of Ca current was slowed by addition to the dialysing solution of agents, such as dibutyryl adenosine 3'-5'-cyclic monophosphate (dibutyryl cyclic AMP), Mg adenosine 5'-triphosphate (ATP) and the catalytic subunit of cyclic-AMP-dependent protein kinase, that promote protein phosphorylation and by EGTA. However, neither the phosphorylation-promoting agents nor internal EGTA prevented wash-out entirely, nor did they significantly restore previously 'washed-out' current. With phosphorylating agents in the dialysing solution, the irreversible development of wash-out was greatly reduced by introduction of leupeptin, an inhibitor of protease activity. Thus, the irreversible component of wash-out appears to result from a Ca-dependent proteolytic process. In the presence of leupeptin alone, Ca current amplitude continued to decline: however, the current could be largely or fully restored with addition of catalytic subunit, dibutyryl cyclic AMP, and Mg ATP to the dialysing solution. Thus, inhibition of proteolysis revealed a reversible component of wash-out that appears to result from dephosphorylation. During perfusion with leupeptin, Mg ATP, dibutyryl cyclic AMP and catalytic subunit the Ca current remained stable for up to several hours without addition of internal Ca2+ buffer. The rate of inactivation of the current that occurs during a depolarizing step showed only a very gradual decline during this time. Under these conditions, perfusion with calcineurin, a Ca-calmodulin-dependent phosphatase, caused a significant increase in the rate of Ca current inactivation. This inactivation was virtually eliminated by introduction of EGTA or by replacement of external Ca2+ with Ba2+, which is consistent with the ion dependency for calmodulin-dependent activation of calcineurin. When ATP in the dialysate was replaced with ATP-gamma-S (adenosine 5'-O-(thiotriphosphate], an analogue that donates a thiophosphate group resistant to hydrolysis, the rate of inactivation slowed. Since Ca-dependent inactivation during step depolarizations is enhanced by conditions that promote dephosphorylation, and Ca current wash-out is slowed by conditions that promote phosphorylation, inactivation and reversible wash-out appear to be related
Building and Defining Behavioral Economics
No full textContains fulltext :
95156.pdf (Publisher’s version ) (Closed access)George Loewenstein, a prominent behavioral economist, recalls thatIn 1994, when Thaler, Camerer, Rabin, Prelec and I spent the year at the Center for Advanced Study in the Behavioral Sciences, we had a meeting to make a kind of final decision about what to call what we were doing. Remarkably, at that time, the name behavioral economics was not yet well established. I actually advocated “psychological economics,” and Thaler was strong on behavioral economics. I'm kind of glad that he prevailed; I think it's a better, catchier, label, although it creates confusion due to association with Behaviorism. (G. Loewenstein, personal email to author, June 16, 2008
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