4,336 research outputs found
Vanadia Promoted Co-AI20 3 Fischer-Tropsch Catalysts
No full textBibliography: leaves 117-124.The primary aim of this work was to study systematically V20 5 promotion on yAI203 supported cobalt-based Fischer-Tropsch catalysts. The y-Ah03 support was modified by addition of varying amounts of vanadia and was subsequently loaded with the same Co content (10 wt-%). The modified supports and catalysts were characterised using conventional characterisation methods. The physio-chemical properties of the vanadia promoted supports and catalysts were characterised using Atomic Adsorption Spectroscopy (AAS), zeta-potential measurements, and BET measurements, X-ray Diffraction (XRD), Temperature Programmed Reduction (TPR), Transmission Electron Microscopy (TEM), and CO chemisorption. Catalyst performance in the Fischer-Tropsch synthesis was tested in fixed bed reactor. A catalysts synthesised from plain y-A1203 was used as a base catalyst. Characterization results show that modification of y-Ab03 support to obtain V205 loadings beyond 1-monolayer vanadia coverage was difficult when using ion exchange. Ion-exchange equilibrium limitations might have caused the poor vanadia loadings beyond 1-monolayer coverage. The supports net surface charge as measured using zeta potential, was decreased by vanadia content in the supports. CO chemisorption results were complex and could only be modelled using dual site Langmuir model assuming the presence of two different sites absorbing CO on the Co-V-AI catalyst system. This made extraction of physical properties from this method rather difficult. Fischer Tropsch synthesis reaction was carried out at typical industrial conditions (T=220°C, P=20 bar (a), H2/CO=2 Xco-60 mol-%) for cobalt catalysts. Vanadia promoted catalysts showed a marked decrease in initial activity. However, the overall deactivation rate was lower with increasing vanadia content. The vanadia content did not affect the chain growth kinetic behavior of the catalyst in the Fischer-Tropsch synthesis hence C5+ selectivity in the Fischer-Tropsch synthesis was unperturbed by vanadia content. Increasing the vanadia content in the catalyst resulted in high n-olefin content and high 1-olefin content. The observed increase in olefin content might be due to the low catalytic activity observed for the catalysts with high vanadia loadings. The most pronounced effect of vanadia promotion on Fischer Tropsch synthesis was in the oxygenate content in the Fischer-Tropsch product. Catalysts with high vanadia loading yielded high amounts of oxygenate products; mainly alcohols and aldehydes
Das Korinthische Kapitell im Alten Israel in der Hellenistischen und römischen Periode - Studien zur Geschichte der Baudekoration im Nahen Osten Mainz: ,1996
No full textItem does not contain fulltextM.L. Fischer Das Korinthische Kapitell im Alten Israel in der Hellenistischen und römischen Periode - Studien zur Geschichte der Baudekoration im Nahen Osten Mainz: ,199
Realtà, realismo, straniamento : Auerbach e il romanzo cavalleresco fino a Cervantes
No full textAuerbach’s research, besides exploring the three main fields the author explicitly names (i.e. the succession of different and differently grounded forms of realism in literary fiction, the alternate splitting and melting of styles, the link between literary work and a Christian vision of the world), in various chapters of Mimesis, and particularly in chs. 2, 6, 12, 14 and 20, is also focused, albeit only implicitly, on the developments of a further distinctive feature in Western literature, which is the emergence of subjectivity in the representation of reality. Focusing mainly on the chapter on courtly romance (ch. 6) and on the Quijote (ch. 14), this essay will examine Auerbach’s interpreting work on texts that adopt, in different ways, a ‘subjective point of view’; this kind of interpretation is, in part, unexpectedly similar to the approach of other critics and theorists of literature contemporary to Auerbach, like Bachtin, Américo Castro and Viktor Šklovskij
Shedding light on the black hole: The roll-out of broadband access networks by private operators
No full textSeveral market studies have indicated that the roll-out of broadband has significant economic and social relevance. The investments in broadband infrastructures needed to realise these economic and social benefits are, however, high-risk. This is firstly caused by the fact that the roll-out of access networks is extremely costly and requires high initial investments. Moreover, the multidisciplinary environment and involvement of many actors with diverging objectives and interests cause high complexity. Moreover, the market for broadband is changing fast and continuously. Although broadband has been on the academic research agenda for quite some time, this has as yet not resulted in a structured insight into the decision-making process around the upgrading of broadband networks, seen from the perspective of private operators and taking into account the vast complexity of the surroundings in which this decision-making process takes place in. The objective of this research was to provide a unifying theory combining technical, economic, market-related and regulatory factors with regard to an evolutionary, flexible approach of network upgrading from a decision-maker perspective. The result of this research is a robust, explanatory, parsimonious model for the impact and outcomes of broadband roll-out. This model provides a certain degree of stability in this multidisciplinary, unpredictable and highly dynamic research field.Technology, Policy and Managemen
Carry On. March for Piano Solo.
No full textsectionalpianoRespectfully Dedicated to General Pershingads on back cover for Carl Fischer stock20575-4Johns Hopkins University, Levy Sheet Music Collection, Box
057, Item 045By M.L. Lake
Carry On. March for Piano Solo.
No full textsectionalpianoRespectfully Dedicated to General Pershingads on back cover for Carl Fischer stock20575-4Johns Hopkins University, Levy Sheet Music Collection, Box
057, Item 045By M.L. Lake
“Maistre (certa)”. Niveaux de savoir et conception du monde chez Guillaume IX d’Aquitaine
No full textStarting with a study by M. Black (Models and Archetypes, 1958), the author examines the possibility of broadening this heuristic perspective to include literature. In particular, she analyses a text by William IX, in which the troubadour seems identify himself with God
Oltre lo specchio: il Joufroi de Poitiers e la cultura lirica del suo autore
No full textCome è stato a più riprese osservato, il Joufroi de Poitiers, romanzo d’autore borgognone collocabile verso la metà del XIII secolo, si ispira molto da vicino alla figura di Guglielmo IX d’Aquitania, grande signore e primo trovatore di cui ci siano giunti i componimenti. Ma a quali materiali si ispira veramente l’autore del Joufroi? Alla vida provenzale conservata, o piuttosto a una più ampia biografia latina perduta, o ad altri testi ancora? La presente ricerca cercherà di mettere in luce quali siano state le effettive fonti del romanzo e di abbozzare un’ipotesi che spieghi le motivazioni di questi recuperi.As has been repeatedly noted, Joufroi de Poitiers, a novel written by a Burgundian author and composed around the middle of the thirteenth century, is based very closely on the figure of William IX of Aquitaine, great lord and first troubadour whose poems have been compiled. But what materials did truly inspire the author of Joufroi? The extant Provençal vida, or rather a lost broader Latin biography, or still other texts? This research will try to shed light on what were the actual sources of the novel and to outline a hypothesis that explains the motivations of these works
Proceedings of the Per Bruun Symposium
No full textHolocene sea level rise, shoreline erosion and the Bruun Rule-overview (J.J. Fisher) The Bruun Rule: A historical perspective (M.L. Schwartz and V. Milicic) Hypothetical shore profiles in response to rising water level (R.N. Dubois) Shoreline erosion, Rhode Island and North Carolina coasts-test of Bruun Rule (J. J. Fisher) An application of the Bruun Rule in the Chesapeake Bay (P.S. Rosen) Bruun's Concept applied to the Great Lakes (E.B. Hands) Enigma of the Bruun's formula in shore erosion (H. Allison) The 11 Bruun Rule", Discussion on boundary conditions (P. Bruun)KWP-collectio
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