1,721,001 research outputs found
Productivity effects of eco-innovations using data on eco-patents
No full textWe investigate the productivity effects of eco-innovations at the firm level using a modified version of the CDM model (Crépon et al., 1998). The peculiar nature of environmental innovations, especially as regards the need of government intervention to create market opportunities, is likely to affect the way they are pursued and their effect on productivity. The analysis is based on an unbalanced panel sample of Italian manufacturing firms merged with data on patent applications and balance sheet information. When looking at the returns of innovations in terms of productivity, we observe that eco-innovations exhibit a generally lower return relative to other innovations, at least in the short run. This differential effect is more pronounced for polluting firms, which are likely to face higher compliance costs for environmental regulations than other firms. This result holds for both the extensive (probability of patenting) and the intensive (patent count) margin
Results of a research regarding the variability of spring depletion curves
Full text linkSprings, no recharge periods, discharge process, depletion coefficient
Problemi ambientali ed idrogeologici dei principali laghi dell'Italia centrale
No full textL’articolo sintetizza i risultati fino ad ora ottenuti di una ricerca, condotta dalle Università di Perugia e della Tuscia, sui Laghi di Bolsena, di Bracciano, di Vico e Trasimeno. Negli ultimi decenni si è avuto un pesante incremento della pressione antropica sui sistemi lacustri (prelievi, pratiche agricole, attività turistica), accoppiato ad un trend climatico siccitoso: ciò ha alterato in maniera notevole l'assetto ambientale dei sistemi stessi. Tali alterazioni sono sintetizzabili nella diminuzione del volume d'acqua invasato nei laghi e nella diminuzione o scomparsa delle portate dei rispettivi emissari; ciò è congiunto al rischio del deterioramento della qualità dell'acqua. Nell’ambito della ricerca sono state ottenute un insieme di nuove informazioni idrologiche ed idrogeologiche e sono stati messi a punto, per i Laghi di Vico,
di Bolsena e Trasimeno, alcuni modelli matematici. I risultati ottenuti, pur se non definitivi, indicano che, considerando le variazioni climatiche in atto, per evitare il peggioramento della situazione ambientale ed economica è necessario adottare nuove strategie gestionali. ENGLISH: The article summarizes the results obtained up until now by research conducted by the University of Perugia and the University of Tuscia on Bolsena, Bracciano, Vico and Trasimeno lakes. In recent decades there has been a considerable increase in anthropic pressure on the lake systems (drawing of water, intensive agriculture, tourism), combined with a dry climatic trend: this has substantially altered the environmental setup of these systems. These alterations can be summarized as the decrease in the volume of water stored in the lakes and the decrease or disappearance of the flow of their outlets; this is connected with the risk of water quality deterioration. During the research new sets of hydrological and hydrogeological information were obtained, and mathematical models were constructed for Bolsena and Vico lakes and Lake Trasimeno. Although not definitive, the results obtained indicate that given the climatic variations taking place, new water management strategies must be adopted in order to avoid a worsening of the environmental situation
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
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
The groundwater budget: A tool for preliminary estimation of the hydraulic connection between neighboring aquifers
No full textGroundwater management authorities usually use groundwater budget calculations to evaluate the sustainability of withdrawals for different purposes. The groundwater budget calculation does not always provide reliable information, and it must often be supported by further aquifer monitoring in the case of hydraulic connections between neighboring aquifers.
The Riardo Plain aquifer is a strategic drinking resource for more than 100,000 people, water storage for 60 km2 of irrigated land, and the source of a mineral water bottling plant. Over a long period, the comparison between the direct recharge and the estimated natural outflow and withdrawals highlights a severe water deficit of approximately 40% of the total groundwater outflow. A groundwater budget deficit should be a clue to the aquifer depletion, but the results of long-term water level monitoring allowed the observation of the good condition of this aquifer. In fact, in the Riardo Plain, the calculated deficit is not comparable to the aquifer monitoring data acquired in the same period (1992–2014). The small oscillations of the groundwater level and the almost stable streambed spring discharge allows the presumption of an additional aquifer recharge source.
The confined carbonate aquifer locally mixes with the above volcanic aquifer, providing an externally stable recharge that reduces the effects of the local rainfall variability.
The combined approach of the groundwater budget results and long-term aquifer monitoring (spring discharge and/or hydraulic head oscillation) provides information about significant external groundwater exchanges, even if unidentified by field measurements, and supports the stakeholders in groundwater resource management
- …
