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Now showing items 1 - 16 of 121020

  • An Experimental Study of Film Cooling in a Rotating Transonic Turbine

    Abhari, R. S.   Epstein, A. H.  

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  • Comparison of Time-Resolved Turbine Rotor Blade Heat Transfer Measurements and Numerical Calculations

    Abhari, R. S.   Guenette, G. R.   Epstein, A. H.   Giles, M. B.  

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  • A Navier–Stokes Analysis of Airfoils in Oscillating Transonic Cascades for the Prediction of Aerodynamic Damping

    Abhari, R. S.   Giles, M.  

    An unsteady, compressible, two-dimensional, thin shear layer Navier-Stokes solver is modified to predict the motion-dependent unsteady flow around oscillating airfoils in a cascade. A quasi-three-dimensional formulation is used to account for the str%eamwise variation of streamtube height. The code uses Nis Lax-Wendroff algorithm in the outer region, an implicit ADI method in the inner region, conservative coupling at the interface, and the Baldwin-Lomax turbulence model. The computational meshconsists of an O-grid around each blade plus an unstructured outer grid of quadrilateral or triangular cells. The unstructured computational grid was adapted to the flow to better resolve shocks and wakes. Motion of each airfoil was simulated at each time step by stretching and compressing the mesh within the O-grid. This imposed motion consists of harmonic solid body translation in two directions and rotation, combined with the correct interblade phase angles. The validity of the code is illustrated by comparing its predictions to a number of test cases, including an axially oscillating flat plate in laminar flow, the Aeroelasticity of Turbomachines Symposium Fourth Standard Configuration (a transonic turbine cascade), and the Seventh Standard Configuration (a transonic compressor cascade). The overall comparison between the predictions and the test data is reasonably good. A numerical study on a generic transonic compressor rotor was performed in which the impact of varying the amplitude of the airfoil oscillation on the normalized predicted magnitude and phase of the unsteady pressure around the airfoil was studied. It was observed that for this transonic compressor, the nondimensional aerodynamic damping was influenced by theamplitude of the oscillation.
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  • Pyrene-Fused\r s\r -Indacene

    Melidonie, Jason   Liu, Junzhi   Fu, Yubin   Weigand, Jan J.   Berger, Reinhard   Feng, Xinliang  

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  • A Conversation with S. R. S. Varadhan

    Zeitouni   Ofer  

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  • A new look on S–R associations: How S and R link

    Allenmark, Fredrik   Moutsopoulou, Karolina   Waszak, Florian  

    Highlights • We investigate the perceptual specificity of the stimulus in S–R priming. • S–R priming effects were found between the stimulus, the semantic task and the action. • But they did not depend of the maintenance of the perceptual features of the stimulus. • S–R priming involves a perceptually non-specific stimulus representation. Abstract Humans can learn associations between stimuli and responses which allow for faster, more efficient behavior when the same response is required to the same stimulus in the future. This is called stimulus–response (S–R) priming. Perceptual representations are known to be modular and hierarchical, i.e. different brain areas represent different perceptual features and higher brain areas represent increasingly abstract properties of the stimulus. In this study we investigated how perceptually specific the stimulus in S–R priming is. In particular we wanted to test whether basic visual features play a role in the S–R associations. We used a novel stimulus: images of objects built from basic visual features. Participants performed a classification task on the objects. We found no significant effect on reaction times of switching vs. repeating perceptual features between presentations of the same object. This suggests that S–R associations involve a perceptually non-specific stimulus representation.
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  • S\r ee\r DB

    Vartak, Manasi   Rahman, Sajjadur   Madden, Samuel   Parameswaran, Aditya   Polyzotis, Neoklis  

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  • Artist\"s Statement: R&R (… &R)

    Susanne Slavick  

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  • Properties of\r S\r -tensors

    Guo, Qi   Zheng, Meng-Meng   Huang, Zheng-Hai  

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  • ?la? A??r? Kullan?m? Ba?a?r?s?: S?k Ve ?nlenebilir Bir Ba?a?r?s? Nedeni

    Kocasoy ORHAN, Elif   BAYKAN, Betül  

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  • Process for the preparation of (R,S)-nicotine

    A method of preparing (R,S)-nicotine, comprising reacting a nicotinate ester with N-vinyl-2-pyrrolidinone in the presence of a base and a solvent to form a first mixture, combining the first mixture with an acid to form a second mixture comprising an aqueous layer, separating the aqueous layer from second mixture, combining the separated aqueous layer with an acid to form a third mixture, combining the third mixture with a base to form a fourth mixture comprising myosamine, reducing myosamine to nornicotine using a reducing agent, and methylating the nornicotine to yield R,S-nicotine.
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  • S\r pinel

    Billet, Benjamin   Issarny, Valérie  

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  • Honoring S. R. Elliott

    David A. Drabold and Edward A. Davis  

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  • Honoring S. R. Elliott

    Drabold, David A.   Davis, Edward A.  

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  • Weakly torsion free\r S\r -posets

    Liang, Xingliang   Laan, Valdis   Luo, Yanfeng   Khosravi, Roghaieh  

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  • What\"s next in\r Radioprotection\r ?

    Bourguignon, M.   Bérard, P.   Bertho, J.M.   Farah, J.   Mercat, C.  

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