178,589 research outputs found

    Fractal dimensions for dissipative sets

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    Stratmann, Fr. M., O.P., Die Heiligen und der Staat, 4. Band, 1952

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    R. C. Stratmann, Fr. M., O.P., Die Heiligen und der Staat, 4. Band, 1952. In: Revue des Sciences Religieuses, tome 27, fascicule 4, 1953. p. 424

    Stratmann, Fr. M., O.P., Die Heiligen und der Staat, 4. Band, 1952

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    R. C. Stratmann, Fr. M., O.P., Die Heiligen und der Staat, 4. Band, 1952. In: Revue des Sciences Religieuses, tome 27, fascicule 4, 1953. p. 424

    Stratmann, Fr. M., O. P., Jésus-Christ et l'Etat, traduit de l'allemand par P. Lorson, 1952

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    R. C. Stratmann, Fr. M., O. P., Jésus-Christ et l'Etat, traduit de l'allemand par P. Lorson, 1952. In: Revue des Sciences Religieuses, tome 27, fascicule 4, 1953. pp. 423-424

    Stratmann, Fr. M., O. P., Jésus-Christ et l'Etat, traduit de l'allemand par P. Lorson, 1952

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    R. C. Stratmann, Fr. M., O. P., Jésus-Christ et l'Etat, traduit de l'allemand par P. Lorson, 1952. In: Revue des Sciences Religieuses, tome 27, fascicule 4, 1953. pp. 423-424

    Appropriate Similarity Measures for Author Cocitation Analysis

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    We provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis

    Resonances for graph directed Markov systems, and geometry of infinitely generated dynamical systems

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    In the first part of this thesis we transfer a result of Guillopé et al. concerning the number of zeros of the Selberg zeta function for convex cocompact Schottky groups to the setting of certain types of graph directed Markov systems (GDMS). For these systems the zeta function will be a type of Ruelle zeta function. We show that for a finitely generated primitive conformal GDMS S, which satisfies the strong separation condition (SSC) and the nestedness condition (NC), we have for each c>0 that the following holds, for each w \in\CC with Re(w)>-c, |\Im(w)|>1 and for all k \in\NN sufficiently large: log | zeta(w) | <<e^{delta(S).log(Im|w|)} and card{w \in\ Q(k) | zeta(w)=0} << k^{delta(S)}. Here, Q(k)\subset\%Cdenotesacertainboxofheightk,anddelta(S)referstotheHausdorffdimensionofthelimitsetofS.Inthesecondpartofthisthesisweshowthatinanydimensionm$N denotes a certain box of height k, and delta(S) refers to the Hausdorff dimension of the limit set of S. In the second part of this thesis we show that in any dimension m \in\$N there are GDMSs for which the Hausdorff dimension of the uniformly radial limit set is equal to a given arbitrary number d \in\(0,m) and the Hausdorff dimension of the Jørgensen limit set is equal to a given arbitrary number j \in\ [0,m). Furthermore, we derive various relations between the exponents of convergence and the Hausdorff dimensions of certain different types of limit sets for iterated function systems (IFS), GDMSs, pseudo GDMSs and normal subsystems of finitely generated GDMSs. Finally, we apply our results to Kleinian groups and generalise a result of Patterson by showing that in any dimension m \in\NN there are Kleinian groups for which the Hausdorff dimension of their uniformly radial limit set is less than a given arbitrary number d \in\ (0,m) and the Hausdorff dimension of their Jørgensen limit set is equal to a given arbitrary number j \in\ [0,m)

    "Closing the R&D Gap, Evaluating the Sources of R&D Spending"

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    Both spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
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