1,721,487 research outputs found
Memory and cerebellum
No full textMemory is one of the most studied topics in cognitive psychology. Attention to memory has branching out to various domains such as neurobiology, artificial intelligence, and, more recently, neuroscience. Several models have been developed to explain how memory works, some of which, such as those based upon the distinction between short-term or long-term memory have found a place in the collective imagination and have promoted an extremely effective terminology within both the scientific and the popular literatures. Generally speaking, we can define memory as the ability to retrieve information, but this definition does not account either for the fact that this information is continuously changed, modified, or for the lack of a precise correspondence between what is originally encoded and what is later retrieved. At this point, we could ask ourselves: is memory a memory system? Is the purpose of memory to remember
Reynolds number effect on turbulent drag reduction
No full textAn analytic relationship that predicts the Reynolds number effect on turbulent drag reduction by active means is developed in analogy with riblets. It is applicable to all control techniques whose action result in an upward shift ∆B of the logarithmic region of the turbulent velocity profile. In particular, we use it to address the Re-effect affecting streamwise-traveling waves of spanwise wall velocity \cite{quadrio-ricco-viotti-2009}, aided by a new large dataset of Direct Numerical Simulations of turbulent channel flows at increasing Re. The main outcome of this study is that the control-induced upward-shift of the logarithmic region ∆B does not vary with Re along a large part of the wave parameter space, also where high drag reduction is achieved. Here, the analytical relationship allows to extrapolate low-Re drag reduction information to high-Re flows. In the narrow regions where ∆B does vary with Re, an additional Re-effect is deemed to exist, which depends on the present control technique only and which is investigated with a three-dimensional phase conditional averaging procedure
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
The macroeconomic effects of default and debt restructuring: An agent based exploration
No full textIn this paper we investigate the economic impact of bank reactions to firm financial delinquency. In case of firm liquidity shortage, indeed, the bank commonly proposes two different solutions of debt restructuring to help large firms to recover from their financial distress situation. One option is the debt rescheduling: the bank agrees to an extension of the debt maturity, i.e., to be repaid in the following time periods. The other one is the debt relief: the bank agrees to renegotiate the terms of the debt contract, i.e, to apply a discount rate on the firm past and present debt. We find that higher bank tolerance and debt discount correspond to higher average GDP level, growth rate and volatility. Moreover, the number of recessions decreases while their duration increases. Finally, we perform a monetary policy exercise, finding that an expansionary policy coupled with higher bank tolerance would be very beneficial to the economy
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe 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
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