971 resultados para metal ultrafine particles
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Metal Music as Critical Dystopia: Humans, Technology and the Future in 1990s Science Fiction Metal seeks to demonstrate that the dystopian elements in metal music are not merely or necessarily a sonic celebration of disaster. Rather, metal music's fascination with dystopian imagery is often critical in intent, borrowing themes and imagery from other literary and cinematic traditions in an effort to express a form of social commentary. The artists and musical works examined in this thesis maintain strong ties with the science fiction genre, in particular, and tum to science fiction conventions in order to examine the long-term implications of humanity's complex relationship with advanced technology. Situating metal's engagements with science fiction in relation to a broader practice of blending science fiction and popular music and to the technophobic tradition in writing and film, this thesis analyzes the works of two science fiction metal bands, VOlvod and Fear Factory, and provides close readings of four futuristic albums from the mid to late 1990s that address humanity's relationship with advanced technology in musical and visual imagery as well as lyrics. These recorded texts, described here as cyber metal for their preoccupation with technology in subject matter and in sound, represent prime examples of the critical dystopia in metal music. While these albums identify contemporary problems as the root bf devastation yet to come, their musical narratives leave room for the possibility of hope , allowing for the chance that dystopia is not our inevitable future.
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The Arabidopsis NPRI protein regulates systemic acquired resistance dependent on salicylic acid. Analyses by plant two-hybrid analysis in vivo and pull-down assays in vitro showed that the BTB/POZ domain of NPRI at the N-terminus serves as an autoinhibitory domain to negate the function of the transactivation domain at the C-terminus through direct binding of these two domains. I t was also shown that the binding of the BTB/POZ domain to the C-terminus of NPRI was abolished by SA treatment, suggesting that SA could interfere directly with this binding. By gel filtration, it was demonstrated that SA affects the conformation of full-length NPRl , confirming the role of NPRI as an SA receptor. Gel filtration analysis also indicated that NPRI could be converted from an oligomer to a dimer with SA treatment. Furthermore, one N-terminal deletion ~513 has been shown to act as a metal-binding protein and its two Cys-521 and Cys-529 are important for binding to Ni 2 + by pull-down assays.
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Experimental Extended X-ray Absorption Fine Structure (EXAFS) spectra carry information about the chemical structure of metal protein complexes. However, pre- dicting the structure of such complexes from EXAFS spectra is not a simple task. Currently methods such as Monte Carlo optimization or simulated annealing are used in structure refinement of EXAFS. These methods have proven somewhat successful in structure refinement but have not been successful in finding the global minima. Multiple population based algorithms, including a genetic algorithm, a restarting ge- netic algorithm, differential evolution, and particle swarm optimization, are studied for their effectiveness in structure refinement of EXAFS. The oxygen-evolving com- plex in S1 is used as a benchmark for comparing the algorithms. These algorithms were successful in finding new atomic structures that produced improved calculated EXAFS spectra over atomic structures previously found.
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Round stamp 2 cm in diameter. This has the image of a lion within a crown holding a flower. The inscription underneath is "sans changer" which means constant or without change. The stamp is 1 cm thick and it has a 1 cm stem protruding from it.
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Square metal stamp, 2 1/2 cm x 6 1/2 cm, with the words "P.C. Band, Toronto, Ontario" engraved on it. The bar is 1 cm thick.
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Round metal stamp which is 2 cm in diameter. The metal forms a cup above the seal which holds an amethyst piece. The amethyst is broken off and cracked.
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Metal bar, 2 cm x 6 1/2 cm, with the words "P.C. Band, Toronto, Ontario" engraved on it.
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Metal button 2 cm in diameter showing the crest of the right arm holding the honeysuckle (Woodruff crest). The button is inscribed in the inside. It has the number 50 on it and it says "N. R. Hayward, Long Acre, London, W. C."
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Our work on single molecule magnets and multifunctional magnetic materials is presented in four projects. In the first project we show for first time that heteroatomic-type pseudohalides, such as OCN-, can be employed as structure-directing ligands and ferromagnetic couplers in higher oxidation state metal cluster chemistry. The initial use of cyanato groups in Mn cluster chemistry has afforded structurally interesting MnII/III14 (1) and MnII/III/IV16 (2) clusters in which the end-on bridging cyanates show a preference in binding through their O-atom. The Mn14 compound shows entirely visible out-of-phase alternating currect signals below 5 K and large hysteresis loops below 2 K. Furthermore, the amalgamation of azido groups with the triethanolamine tripodal ligand in manganese carboxylate cluster chemistry has led to the isolation of a new ferromagnetic, high-nuclearity and mixed-valence MnII/III15Na2 (3) cluster with a large ground-state spin value of S = 14. In the second project we demonstrate a new synthetic route to purely inorganic-bridged, transition metal-azido clusters [CoII7 (4) and NiII7 (5)] and coordination polymers [{FeII/III2}n (6)] which exhibit strong ferromagnetic, SMM and long-range magnetic ordering behaviors. We also show that access to such a unique ferromagnetic class of inorganic, N-rich and O-free materials is feasible through the use of Me3SiN3 as the azido-ligand precursor without requiring the addition of any organic chelating/bridging ligand. In the last projects we have tried to bring together molecular magnetism and optics via the synthesis of multifunctional magnetic materials based on 3d- or 4f-metal ions. We decided to approach such challenge from two different directions: firstly, in our third project, by the deliberate replacement of non-emissive carboxylato ligands in known 3d-SMMs with their fluorescent analogues, without perturbing the metal-core structure and SMM properties (complexes 7, 8, and 9). The second route (last project) involves the use of naphthalene or pyridine-based polyalcohol bridging ligands for the synthesis of new polynuclear LnIII metal clusters (Ln = lanthanide) with novel topologies, SMM behaviors and luminescent properties arising from the increased efficiency of the “antenna” organic group. This approach has led us to the isolation of two new families of LnIII8 (complexes 10-13) and LnIII4 (complexes 14-20) clusters.
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Tesis (Maestría en Ciencias de la Administración con Especialidad en Producción y Calidad) UANL
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Tesis (Maestría en Salud Pública con Especialidad en Salud en el Trabajo) UANL.
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Tesis (Maestría en Salud Pública con Especialidad en Salud en el Trabajo) U.A.N.L., 2001.
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Tesis (Maestría en Salud Pública con Especialidad en Salud en el Trabajo) U.A.N.L., 2001 & Bibliografía: h. 33-36.
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Tesis (Maestría en Ciencias con Especialidad en Ingeniería Ambiental) U.A.N.L.
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Tesis (Maestría en la Enseñanza de las Ciencias con Especialidad en Química) U.A.N.L.