1,721,059 research outputs found
Stereospecific synthesis of 1-aryl-2-(1H-imidazol-1-yl)-O-(alkyl)-ethanoxime ethers with broad spectrum in vitro antifungal.
No full textTorin
Finding economic optimality in leakage reduction: A cost-simulation approach for complex urban supply systems
No full textAbstractThe optimal economic level in leakage reduction must be defined when reaching equilibrium between marginal costs of saved water and marginal costs of achieving additional reduction in leakage (Farley and Trow, 2003). This concept is used to deal with the question of what the target in reducing leakage should be and how related costs can be justified. Nevertheless, when negotiating for optimal decisions considering complex multi-centre (or multi-district) supply systems, subject to reduced water resources and reduced funds, the problem could be much more difficult to define and analyze. Mainly, in this situation, the optimal economic problem can be modified in finding the priorities in investment for leakage reductions between the centres in the supply network. This paper is related to these aspects; it mainly focuses on finding a reliable and correctly justified cost- function attribution for the water in multi-source and multi-centre systems
Exploring the dynamics of the efficiency in the Italian hospitality sector. A regional case study
No full textThis paper introduces a methodology to describe and compare the economic relative performance of the
hospitality sector of the Italian regions during the period 2000–2004. Dynamics of the hospitality sector
of each region is represented by the evolution of its economic efficiency. The investigation involves the
following steps: a static Data Envelopment Analysis (DEA) to estimate the pure economic efficiency;
two different notions of distances between time series and hierarchical clustering techniques are used
to classify the economies in the sample. By using a correlation-based distance, three main clusters are
detected, while two clusters are identified when the average distance is used. The trend patterns, identified by employing the correlation distance, can be interpreted in terms of exogenous factors that influence the economic efficiency of the group of regions, causing shocks picked up by the high volatility as
well as structural breaks. By employing the average distance, one infers information on the cluster that
have had similar efficiency values over the period under analysis. This efficiency can be also interpreted
in terms of a particular type of hospitality management as well as the firm structure. Following the analysis, some policy and management implications are presented
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
A rapid method for screening large numbers of environmental microorganisms for antiviral activity
No full textVariations 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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