336 research outputs found
Revista de revistas: Algunas observaciones sobre neumonia primaria atípica
No full textArchives of Internal Medicine. Noviembre-diciembre. 1945.
Capitán Jacob Grossmann. Med. Corp-Army. U. S. A
Phase diagram of turbulent Taylor-Couette flow
No full textWe will present the results of our recent numerical work on the nature of the phase diagram of turbulent Taylor-Couette (TC) flow, both with co- and counterrotating cylinder. The work can be seen as the extension of the famous experimental Andereck et al. phase diagram for Taylor-Couette flow just above the onset of instabilities, towards the ultimate turbulence regime, and now obtained numerically. In particular, we will understand when and why optimal transport of angular velocity from the inner to the outer cylinder is achieved and how this is connected to the angular velocity profile and the structures in the flow
Von der Christen Sabbat ein Predig auss dem heiligen Propheten Jeremia am 17. cap : darinn wirt nit allein gehandlet, das der Sabbat von Anfang von Gott selber eingesetzt unnd auch hernach in seinem Gesatz zehalten gebotten sey: ...
No full textalles in ein Predig verfasst durch Johann Jacob Buwman, Dieneren der Kirchen Christi zuo Kilchberg am ZürichseeHolzschnitte mit Familienwappen der beiden Bürgermeister Konrad Grossmann (Wegmann, Nr. 3178) und Johannes Keller auf Bl. )(5Bogensignaturen: )(, A-C⁸, D
Double diffusive convection between two parallel plates with different boundary conditions
No full textWe investigate the double diffusive convection between two parallel plates with either no-slip or free-slip boundary conditions. Direct numerical simulations have been conducted systematically for a series of control parameters. Salt fingers can be observed for both boundary conditions and all parameters explored. Compared to the no-slip case, salt fingers are stronger in the free-slip case, which is accompanied by larger salinity flux and flow velocity. For both boundary conditions, thin boundary regions develop adjacent to two plates. The salinity flux and the Reynolds number show similar dependences on the control parameter, namely, the Rayleigh number of the salinity field
The scientific author
No full textThis presentation connects developments in the science studies with those in scientific discourse analysis. Science studies has undergone a veritable anthropological revolution and come to pay more attention to the concrete situations in which science is elaborated in the laboratory. The focus is now on the rhetoric mobilised to convince peers or potential funding bodies, and on genres that had been heretofore neglected such as letter writing, oral exchanges, notes, memos, reports and paper submissions. A parallel renewal of linguistic and rhetorical approaches is all the more necessary because of this empirical focus: how is the writing process – with its linguistic and iconic characteristics – informed by production conditions? How is it informed by cognitive, epistemological and social issues? However, the role of the scientific author must not be forgotten as it is central to understanding scientific positioning. To succeed in initiating much-needed interdisciplinary dialogue, we need to clarify the subjects at stake – authorship and scientific discourse –, as well as their connection to linguistic and semiotic forms.On se propose ici de mettre en relation les évolutions des études de la science avec celles de l’analyse des discours scientifiques. Une véritable révolution anthropologique a conduit les Science Studies à porter plus d’attention aux conditions concrètes dans lesquelles se fabrique la science au sein du laboratoire. Les chercheurs se sont davantage intéressés aux rhétoriques mobilisées pour convaincre les pairs ou les éventuels financeurs, et ont pris en compte des genres de discours parfois peu étudiés : échanges épistolaires ou oraux, notes, mémos, rapports, propositions de communication. Cette attention au concret montre tout l’intérêt d’un renouvellement parallèle des approches linguistiques et rhétoriques, qui ont à mieux comprendre comment l’écriture scientifique – texte et image – est informée par la situation de production, mais aussi par les enjeux cognitifs, épistémologiques et sociaux d’une recherche. La question de l’auteur scientifique n’est pas pour autant évacuée : elle reste centrale pour mieux comprendre les jeux du positionnement scientifique. Si l’on veut initier efficacement le nécessaire dialogue pluridisciplinaire, des clarifications s’imposent, concernant les objets concernés – l’auctorialité et les discours scientifiques – dans leurs rapports avec les formes linguistiques ou sémiotiques.La problemática de esta presentación busca entrecruzar las evoluciones de los estudios de la ciencia con las evoluciones del análisis de discursos científicos. En efecto, una verdadera revolución antropológica ha llevado los estudios de ciencia a prestar más atención a las condiciones concretas en las cuales se fabrica la ciencia al interior del laboratorio. Nos interesamos igualmente de manera especial a las retoricas movilizadas para convencer a los colegas investigadores o a las personas que eventualmente financian la investigación y tomamos en cuenta géneros de discurso muchas veces poco estudiados: intercambios epistolares u orales, notas, memorandos, reportes, proposiciones de comunicación. La atención que se presta a estos objetos concretos muestra el gran interés que representa una renovación paralela de los análisis lingüísticos y retóricos, que permiten comprender como la realización del texto y, algunas veces, la realización de la imagen, se dan a conocer gracias a la situación de producción, y a los aportes cognitivos, epistemológicos y sociales de una investigación. La cuestión del autor científico no está sin embargo resuelta: esta cuestión sigue siendo central para comprender el rol de la position científica. Si se quiere maniobrar eficazmente el ineludible dialogo pluridisciplinario, algunas clarificaciones son necesarias, estas tienen que ver con los objetos implicados –la «autorialidad» y los discursos científicos – en sus relaciones con las formas lingüísticas o semiótica
Constraining Anthropogenic and Biogenic Emissions using Chemical Ionization Mass Spectrometry
Get PDFNumerous gas-phase anthropogenic and biogenic compounds are emitted into the atmosphere. These gases undergo oxidation to form other gas-phase species and particulate matter. Whether directly or indirectly, primary pollutants, secondary gas-phase products, and particulate matter all pose health and environmental risks. In this work, ambient measurements conducted using chemical ionization mass spectrometry are used as a tool for investigating regional air quality.
Ambient measurements of peroxynitric acid (HO₂NO₂) were conducted in Mexico City. A method of inferring the rate of ozone production, PO3, is developed based on observations of HO₂NO₂, NO, and NO₂. Comparison of this observationally based PO3 to a highly constrained photochemical box model indicates that regulations aimed at reducing ozone levels in Mexico City by reducing NOx concentrations may be effective at higher NOx levels than predicted using accepted photochemistry.
Measurements of SO₂ and particulate sulfate were conducted over the Los Angeles basin in 2008 and are compared to measurements made in 2002. A large decrease in SO₂ concentration and a change in spatial distribution are observed. Nevertheless, only a modest reduction in sulfate concentration is observed at ground sites within the basin. Possible explanations for these trends are investigated.
Two techniques, single and triple quadrupole chemical ionization mass spectrometry, were used to quantify ambient concentrations of biogenic oxidation products, hydroxyacetone and glycolaldehyde. The use of these techniques demonstrates the advantage of triple quadrupole mass spectrometry for separation of mass analogues, provided the collision-induced daughter ions are sufficiently distinct. Enhancement ratios of hydroxyacetone and glycolaldehyde in Californian biomass burning plumes are presented as are concentrations of these compounds at a rural ground site downwind of Sacramento.</p
A bibliography of numismatic books printed before 1800 /
No full textReprint of the 1801 ed. of the Lipsius Bibliotheca numaria published by Schaefer, Leipzig, and of the 1867 ed. of the Leitzmann supplement published by Grossmann, Weissensee
The Fourth Way
No full textReinhardt Grossmann holds that a realistic ontology in regard to perceptual, physical, and mathematical objects can be combined with an empiricistic theory of knowledge. In the first part of the book he shows that the traditional distinction between primary and secondary qualities leads to idealism, while the common Cartesian conception of knowledge by way of ideas leads to skepticism. In an effort to avoid these twin scourges of modem philosophy, the author argues for the existence of ordinary perceptual objects and explains how we know these objects directly through simple acts of perception. The second part of the book is concerned with the way in which we know what is in our minds. Grossmann maintains that this kind of knowledge is just as fallible as perception. In the third part the author concludes that logic, arithmetic, and set theory concern matters of fact and that we discover these facts through empirical knowledge
Figures de l’auteur en didactique
No full textLes contributions réunies dans ce numéro traitent sous des angles très différents, les questions fondamentales qui visent à dessiner la figure complexe de l’auteur en didactique. The contributions gathered in this issue address, from varying points of view, the fundamental questions that aim to outline the complex figure of the author in didactics
Comparison of Currents derived from X-band Radar and collected In-situ Data in Ameland Inlet
No full textVelocities derived from X-band radar were compared to depth averaged ADCP measurements in a complex tidal inlet system at Ameland, the Netherlands. Inclusion of depth assimilation and ensemble averaging in radar calculations led to smaller differences between ADCP and radar. The observed differences were clustered and related to water level elevations, wind velocities, wave periods, wave heights, spatial coherence in radar output and error metrics of the radar fitting procedure. Larger waves and higher wind velocities were observed to benefit radar agreement with ADCP results. Rising water levels benefitted agreement in east west direction. Falling water levels benefitted agreement in north south direction. Confidence intervals of the fitting procedure were observed to coincide with differences between ADCP and radar and potential for filtering based on them was shown. Nevertheless, an unclarified tendency towards northwestern bias, which may be specific to the comparison locations, remains. The radar at Ameland monitors the whole inlet system and provides current velocities everywhere in its range. This study shows that its currents are in good agreement with ADCP depth averaged currents throughout most of the tidal cycle. Furthermore, it stresses radar’s potential for better monitoring of the coast and for cost effective coastal field measurements to obtain large datasets, even in hydrodynamically very complex regions.SEAWAD: research into a sand engine for the Wadden IslandsKustGenese 2.0Coastal and Marine Engineering and Management (CoMEM
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