111,748 research outputs found

    Europe is now stuck in a fiscal trap, brought about by the failure of orthodox economics to provide an effective strategy for economic growth

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    The United States has yet to resolve its “fiscal cliff”, its own version of austerity. Dimitri B. Papadimitriou and Greg Hannsgen of the Levy Economics Institute offer an analysis of what they term the “fiscal trap.” They argue many economists and policymakers continue to misunderstand the role of fiscal policy, especially in times of economic turmoil, and have, as a result, failed to offer effective policies to repair the economies of the US and eurozone

    Student Chamber Music Concert, December 6, 1990

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    This is the concert program of the Student Chamber Music Concert performance on Thursday, December 6, 1990 at 6:30 p.m., at the Boston University Concert Hall, 855 Commonwealth Avenue, Boston, Massachusetts. Works performed were Contrasts for violin, clarinet and pianoforte by Béla Bartók, Partita for Wind Quintet by Irving Fine, Piano Trio in E-flat major, Op. 100 by Franz Schubert, String quartet in C minor, No. 8, Op. 110 by Dimitri Shostakovich, and Piano Trio in B-flat major, K. 502 by Wolfgang Amadeus Mozart. Digitization for Boston University Concert Programs was supported by the Boston University Humanities Library Endowed Fund

    Student Chamber Music Concert, December 6, 1990

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    This is the concert program of the Student Chamber Music Concert performance on Thursday, December 6, 1990 at 6:30 p.m., at the Boston University Concert Hall, 855 Commonwealth Avenue, Boston, Massachusetts. Works performed were Contrasts for violin, clarinet and pianoforte by Béla Bartók, Partita for Wind Quintet by Irving Fine, Piano Trio in E-flat major, Op. 100 by Franz Schubert, String quartet in C minor, No. 8, Op. 110 by Dimitri Shostakovich, and Piano Trio in B-flat major, K. 502 by Wolfgang Amadeus Mozart. Digitization for Boston University Concert Programs was supported by the Boston University Humanities Library Endowed Fund

    The auction algorithm : a distributed relaxation method for the assignment problem

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    Bibliography: p. 15-19.Work supported by grant NSF-ECS-8217668by Dimitri P. Bertsekas

    Stability of pole solutions for planar propagating flames: II. Properties of eigenvalues/eigenfunctions and implications to stability

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    In a previous paper (Part I) we focused our attention on pole solutions that arise in the context of flame propagation. The nonlinear development that follows after a planar flame front becomes unstable is described by a single nonlinear PDE which admits pole solutions as equilibrium states. Specifically, we were concerned with coalescent steady states, which correspond to steadily propagating single-peak structures extended periodically over the infinite domain. This pattern is one that is commonly observed in experiments. In order to examine the linear stability of these equilibrium solutions, we formulated in Part I the corresponding eigenvalue problem and derived exact analytical expressions for the spectrum and the corresponding eigenfunctions. In this paper, we examine their properties as they relate to the stability issue. Being based on analytical expressions, our results resolve earlier controversies that resulted from numerical investigations of the stability problem. We show that, for any period 2L, there always exists one and only one stable steady coalescent pole solution. We also examine the dependence of the eigenvalues and eigenfunctions on L which provides insight into the behavior of the nonlinear PDE and, consequently, on the nonlinear dynamics of the flame front

    Gradient System Modelling of Matrix Converters with Input and Output Filters

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    Due to its complexity, the dynamics of matrix converters are usually neglected in controller design. However, increasing demands on reduced harmonic generation and higher bandwidths makes it necessary to study large-signal dynamics. A unified methodology that considers matrix converters, including input and output filters, as gradient systems is presented.

    Temporada coreográfica primavera 1974

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    De cada obra s'ha digitalitzat un programa sencer. De la resta s'han digitalitzat les parts que són diferents.Empresa: Juan A. PamiasOrquestra del Gran Teatre del Liceu dirigida per Dusan Miladinovic i Stanko SepicSinfonia en do : Música de Georges Bizet, coreografia de Dimitri Parlic ; Golem : Música de Francis Burt, coreografia de Dimitri Parlic ; El cisne negro (paso a dos) : Música de Txaikovski, coreografia de M. Petipa ; Danzas Polovtsianas de El prícipe Igor : Música d'Alexander Borodin, coreografia de Michel Fokine, adaptada per Anica Preli

    Local DRLs and automated risk estimation in paediatric interventional cardiology

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    Introduction : Cardiac catheterization procedures result in high radiation doses and often multiple procedures are necessary for congenital heart disease patients. However, diagnostic reference levels (DRL) remain scarce. Our first goal was finding the optimal DRL parameter and determining appropriate DRLs. The second goal was to calculate organ doses (OD), effective doses (ED) and lifetime attributable risks (LAR) per procedure and to provide conversion factors based on dose area product (DAP). Materials and methods : DRLs are calculated for each procedure type, as the 75th percentile of the cumulative value per procedure from the corresponding parameter. All irradiation events in the DICOM Structured Reports were automatically processed and simulated using PCXMC, resulting in OD, ED and LAR. Using a Kruskal Wallis H test and subsequent pairwise comparisons, differences in median values of the DRL parameter between procedure types were assessed. Results : Linear regression showed a strong correlation and narrow confidence interval between DAP and product of body weight and fluoroscopy time (BWxFT), even when all procedures (diagnostic and interventional) are combined. Only 15% of the pairwise comparisons were statistically significant for DAP normalized to BWxFT (DAP(BWxFT)). The latter pairs contained less frequent procedure types with significant outliers. For DAP normalized to BW (DAP(BW)), 38% of the pairwise comparisons showed statistically significant differences. Conversion factors from DAP(BW) to OD and ED were reported for various weight groups, due to the higher correlation between DAP(BW) and both OD and ED than between DAP and both OD and ED. Conclusions : The P75 of DAP(BWxFT) for all procedures combined serves as an appropriate DRL value. This facilitates local DRL determination in smaller paediatric centres, which often have insufficient data to produce appropriate DRLs for different procedure types. Conversion factors are more reliable starting from DAP(BW) instead of DAP and should be used according to the appropriate BW group
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