132,306 research outputs found
"Vivi nell'attimo, vivi nell'eternità". L'Imperatore di Atlantide (1943-44) di Viktor Ullmann e Peter Kien
No full textIn the years in which he was deported to the Theresienstadt ghetto (1943-44), Viktor Ullmann wrote his last Piano Sonatas, the one-act Der Kaiser von Atlantis (The Emperor of Atlantis), which constitutes his testament focuses on the genesis, dramaturgy and symbols of the work, investigating its various musical suggestions: from cabaret to the music of Mahler
Optical probe study of a nonentangling macromolecule solution--bovine serum albumin: Water
No full textThe diffusion coefficient D of polystyrene latex spheres in bovine serum albumin:water was studied as a function of protein concentration c for 0 c D fails by as much as 25 to 50%, D being larger than predicted from the sphere radius R and the solution viscosity. Probe particles with R as large as 0.62 [mu]m were used. D fits well to the form D = Doexp(-[alpha]cv) for [alpha] = 0.004 to 0.008 and v = 0.96 to 0.99. Serum albumin is a globular protein, so chain entanglement cannot cause these non-Stokes--Einsteinian effects, which are presumably due to sphere:albumin interactions. Polystyrene spheres in semidilute polyethylene oxide:water (G. S. Ullmann, K. Ullmann, R. M. Lindner, and G. D. J. Phillies, J. Phys. Chem. 89, 692 (1985)) behave similarly to spheres in serum albumin:water, suggesting that chain entanglement may also not be important in probe diffusion through semidilute polymer solutions.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/25653/1/0000205.pd
Personal Papers (MS 80-0002)
No full textLetter from Chauncey D. Leake to Ullmann Kilgore acknowledging the generous offer from Mr. J. H. Ross to donate 20 acres of land for a state mental hospital. Leake emphasizes the importance of this offer, especially considering the need for two mental hospitals in the Houston, Beaumont, and Galveston areas. He appreciates Mr. Ross's contribution and encourages further discussions about the project
Modeling of core-annular and plug flows of Newtonian/non-Newtonian shear-thinning fluids in pipes and capillary tubes
No full textSolutions for concentric core-annular laminar flows of Newtonian/non-Newtonian shear-thinning fluids in horizontal and inclined pipes are presented. The solution is computed for the general case of a Carreau non-Newtonian fluid proposing an iterative method based on Chebyshev collocation points. The effect of the rheology of the shear-thinning liquid on two-phase flow characteristics is investigated both for gas/liquid and liquid/liquid systems. Concurrent and counter-current flows in horizontal and inclined pipes were studied, while referring to practical two-phase flow aspects, such as the in-situ hold-up, lubrication effects and Ledinegg instability. The main characteristic of such systems is that even though the liquid has a complex rheology (Carreau fluid), the two-phase annular flow can exhibit a Newtonian/Newtonian behavior for a wide range of operational conditions. The identification of those conditions is a key aspect in the modeling activity, as to avoid unphysical predictions by the widely used power-law model. Particular attention is given to the core-annular flow characteristics in capillaries, where we propose also a model for the plug flow regime. Predictions of film thickness and plug propagation velocity are tested by comparison with experimental data, showing promising results and offering new insights on plug flow characteristics in capillaries, in particular for liquid-liquid plug flow. (C) 2018 Elsevier Ltd. All rights reserved
Spiritualità e resistenza morale. Viktor Ullmann a Praga e a Theresienstadt (1938-1944)
No full textNel catalogo delle opere di Viktor Ullmann (1898-1944) sono citati cinque lavori teatrali, due dei quali sono andati perduti e di cui neppure uni fu mai rappresentato vivente l'Autore. Nel presente saggio si evidenzia l'influssio del pensiero di Rudolf Steiner sulla biografia e l'esperienza creativa di Ullmann, procedendo ad una dettagliata ricognizione del manoscritto dell'opere in tre atti "La caduta dell'Anticristo" op. 9 (1936), gentilmente messo a disposizione da Universal Edition (Vienna) e del tutto sconosciuto al pubblico italianoIn the catalogue of Viktor Ullmann's works (1898-1944) five theatrical works are cited, two of which have been lost and none of which were ever performed during the author's lifetime. In this essay, the influence of Rudolf Steiner's thought on Ullmann's biography and creative experience is highlighted, proceeding with a detailed survey of the manuscript of the three-act opera "The Fall of the Antichrist" op. 9 (1035), kindly made available by Universal Edition (Vienna) and completely unknown to the Italian public
Schlechte Aussichten ohne "Quali": die Ausbildungschancen der Hauptschüler im gewerblich-technischen Bereich; eine Untersuchung im Großraum München
No full textSchlechte Aussichten ohne "Quali" : d. Ausbildungschancen d. Hauptschüler im gewerbl.-techn. Bereich ; e. Unters. im Großraum München / Werner Glogauer ; Manfred Ullmann. - In: Bayerische Schule. 37. 1984. 12/13. S. 11-1
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Editorial: Awareness and reflection in personal learning environments
No full textWhile different researchers have stressed the importance of awareness and reflection support in Personal Learning Environments (PLEs) there is no agreed set of such functionalities in existence yet. Also we lack a structured overview of awareness and reflections issues that learners are facing in their daily learning activities. As both researchers and developers interested in the PLE domain seem to be in need of such information in order to best tailor their R&D activities, this workshop brought together participants from educational science, psychology, social science, computer science, and design to collect requirements and open issues in the domain
Walter Ullmann, The Medieval Idea of Law as represented by Lucas de Penna, avec une introduction par H. D. Hazeltine
No full textMaquet J. J. Walter Ullmann, The Medieval Idea of Law as represented by Lucas de Penna, avec une introduction par H. D. Hazeltine. In: Revue Philosophique de Louvain. Troisième série, tome 46, n°12, 1948. pp. 496-498
Walter Ullmann, The Medieval Idea of Law as represented by Lucas de Penna, avec une introduction par H. D. Hazeltine
No full textMaquet J. J. Walter Ullmann, The Medieval Idea of Law as represented by Lucas de Penna, avec une introduction par H. D. Hazeltine. In: Revue Philosophique de Louvain. Troisième série, tome 46, n°12, 1948. pp. 496-498
Identification of topotactic surface-confined Ullmann-polymerization
No full textOn-surface Ullmann coupling is an established method for the synthesis of 1D and 2D organic structures. A key limitation to obtaining ordered polymers is the uncertainty in the final structure for coupling via random diffusion of reactants over the substrate, which leads to polymorphism and defects. Here, a topotactic polymerization on Cu(110) in a series of differently-halogenated para-phenylenes is identified, where the self-assembled organometallic (OM) reactants of diiodobenzene couple directly into a single, deterministic product, whereas the other precursors follow a diffusion driven reaction. The topotactic mechanism is the result of the structure of the iodine on Cu(110), which controls the orientation of the OM reactants and intermediates to be the same as the final polymer chains. Temperature-programmed X-ray photoelectron spectroscopy and kinetic modeling reflect the differences in the polymerization regimes, and the effects of the OM chain alignments and halogens are disentangled by Nudged Elastic Band calculations. It is found that the repulsion or attraction between chains and halogens drive the polymerization to be either diffusive or topotactic. These results provide detailed insights into on-surface reaction mechanisms and prove the possibility of harnessing topotactic reactions in surface-confined Ullmann polymerization
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