1,412,850 research outputs found

    Magnetohydrodynamic turbulence in a Hartmann duct flow at finite magnetic Reynolds number

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    The dynamics of turbulent flow at finite magnetic Reynolds numbers can be very complex due to the coupled nature of the evolution equations for the flow and magnetic fields. In this regime, the Hartmann flow in a straight rectangular duct with streamwise periodicity is studied with the help of direct numerical simulations (DNS) and the effect of magnetic Reynolds number on turbulent statistics is quantified by comparing the results with the numerical results obtained using the quasistatic approximation

    Filosofia morale di Nicolai Hartmann

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    Filosofia morale di Nicolai Hartmann / Piero Martinetti. - Milano : [s.n.], 1935. - 46 p. ; 23 cm. ((Estr. da : Rivista di filosofia - anno 26. - n. 1 - gennaio-marzo 193

    Hartmann’s Sapozon-Sauerstoff Seife; Paul Hartmann A.G., Heidenheim a. d. Brenz

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    HARTMANN’S SAPOZON-SAUERSTOFF SEIFE; PAUL HARTMANN A.G., HEIDENHEIM A. D. BRENZ Hartmann’s Sapozon-Sauerstoff Seife; Paul Hartmann A.G., Heidenheim a. d. Brenz ( -

    A Corrective to Bovens and Hartmann's Measure of Coherence

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    Bovens and Hartmann (2003a, 2003b) propose to analyze coherence as a confidence-boosting property. On the basis of this idea, they construct a new probabilistic theory of coherence. In this paper, I will attempt to show that the resulting measure of coherence clashes with some of the intuitions that motivate it. Also, I will try to show that this clash is not due to the view on coherence as a confidence-boosting property or to the general features of the model that Bovens and Hartmann use to analyze coherence. It will turn out that there is at least one other measure that is similarly based on the concept of a confidence-boosting property, but does not have the same counterintuitive results

    ANÁLISIS Y REDUCCIÓN DE DATOS EN PRUEBAS DE HARTMANN Y SHACK-HARTMANN

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    "En el presente trabajo se desarrolló un paquete computacional utilizando la plataforma labview. Dicho paquete, permite medir la posición de los centroides de los puntos en los patrones de hartmann, los cuales fueron obtenidos mediante la implementación de las pruebas de hartmann y shackhartmann. La finalidad principal de este trabajo, fue la de agilizar el análisis y la reducción de datos de dichas pruebas; además, se prevé que este programa desarrollado sea parte de un módulo computacional más completo. También, se pretende que el módulo final permita obtener la descripción del frente de onda de la superficie analizada. La descripción se realizará mediante la representación zonal, basada en una aproximación polinomial utilizando los polinomios de zernike, y en una representación modal, basada en algún método de integración numérica que permita la reconstrucción del frente de onda. La razón de optimizar las pruebas de hartmann y shack hartmann mediante el paquete computacional desarrollado, recae en el amplio uso de estas pruebas ópticas que actualmente se realiza. El principal motivo para considerar nuevamente estas pruebas se debe a las características de implementación.

    Human Being and Person: a Comparison between Nicolai Hartmann and John McDowell

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    openAlcuni fra i recenti studi dedicati a Nicolai Hartmann hanno indicato un interesse per un confronto fra il filosofo tedesco e John McDowell. Il presente contributo si propone di sviluppare lo spunto ed elaborare il parallelo fra i due autori in chiave antropologica. In “Das Problem des geistigen Seins” Nicolai Hartmann offre una prospettiva sui concetti di essere umano e persona e il confronto con “Mind and World” di John McDowell offre la possibilità di misurare l’efficacia delle posizioni del professore di Berlino. Il confronto sfocia in un punto di vista che va inteso come una sintesi fra le posizioni analizzate. In tale prospettiva l'essere umano è uno dei concetti impiegati dalle persone impegnate nel tentativo di comprendere se stesse; la natura spiegata dalle scienze naturali va compresa come sezione di un insieme più ampio chiamato mondo reale; e gli animali presentano un enigma che dal punto di vista delle persone non può essere risolto, e ciò lascia aperta la possibilità che essi abbiano un modo di essere per noi inconcepibile. Quest’ultima prospettiva potrebbe fornire la base per sviluppare un’approccio non-antropocentrico al nostro rapporto con gli altri animali.Some among the recent studies devoted to Nicolai Hartmann have indicated an interest in a comparison between the German philosopher and John McDowell. The present contribution aims to develop the cue and elaborate the parallel between the two authors from an anthropological angle. In "Das Problem des geistigen Seins", Nicolai Hartmann offers a perspective on the concepts of Human Being and Person, and the comparison with John McDowell's "Mind and World" offers an opportunity to measure the effectiveness of the Berlin professor's positions. The comparison results in a point of view that should be understood as a synthesis between the analyzed positions. In such a perspective, Human Being is one of the concepts employed by Persons engaged in an attempt to understand themselves; Nature explained by the natural sciences is to be understood as a section of a larger whole called the Real World; and animals present an enigma that from the point of view of Persons cannot be entirely solved, which leaves open the possibility that they have a way of being that is inconceivable to us. The latter perspective could provide the basis for developing a non-anthropocentric approach to our relations with other animals

    Cirurgia de hartmann; estudo de 24 casos.

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    Trabalho de Conclusão de Curso - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde, Departamento de Clínica Cirúrgica, Curso de Medicina, Florianópolis, 199

    Depth-Resolved Wavefront Aberrations using a Coherence-Gated Shack-Hartmann Wavefront Sensor

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    In the present paper we investigate the possibility of narrowing the depth range of a physical Shack - Hartmann (SH) wavefront sensor (WFS) by using coherence gating. For the coherence gating, two low coherence interferometry (LCI) methods are evaluated and proof of principle configurations demonstrated: (i) a time domain LCI method based on phase shifting interferometry and (ii) a spectral domain LCI method, based on tuning a narrow band optical source. The two configurations are used to demonstrate each, the possibility of constructing a coherence gated (CG) SH/WFS. It is shown that these configurations produce spot patterns similar to those provided by a conventional SH/WFS. The two proof of principle configurations are also used to illustrate elimination of stray reflections in the interface optics which normally disturb the operation of conventional SH/WFSs. The speed and noise performance of the two CG-SH/WFS implementations are discussed
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