1,721,219 research outputs found
Haplopappus mendocinus Tortosa & A. Bartoli - Isotipo
No full textEjemplar del Herbario ACOR Isotipo de Haplopappus mendocinus Tortosa & A. Bartoli (Asteraceae), colectado por R. Sanzín #3557 (holotipo, MERL) en Mendoza, San Rafeal, entre Diamente y Atuel (Ríos), en Noviembre de 1918. Publicado en Britonnia 54 (1): 51. 2002.
Número de catálogo: ACOR #134 (Mácola #504).Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Herbario ACOR. Córdoba, Argentina.Isotipo de Haplopappus mendocinus Tortosa & A. Bartoli, colectado por R. Sanzín en Mendoza en 1918.Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Herbario ACOR. Córdoba, Argentina
Four new species of Aspergillus from Ivory Coast soil
No full textFour new species of Aspergillus, A. ivoriensis, A. coremiiformis, A. anthodesmis and A. ochraceoroseus, are illustrated and described from cultures obtained from forest soils of the Tai National Park, Ivory Coast
THE IMPACT OF DIFFERENT ENERGY POLICY OPTIONS ON FEEDSTOCK PRICE AND LAND DEMAND: THE CASE OF BIOGAS IN LOMBARDY.
Full text linkThe effectiveness of bioenergy subsidisation policy in greenhouse gas mitigation and their hypothetical effect on the increase of the agricultural commodity prices, have led to a lively debate at the international level. The issue recurred in Italy as well, as a consequence of the growing demand of green maize for biogas production in the Po Valley. Such emerging activity has been accused to increase land rents and maize price, jeopardizing, in turn, important agri-food chains. The aim of this thesis is to quantify the extent to which the rapid spread of biogas raised the maize price at regional level, increasing the demand of land for energy crops. For this purpose we built a partial-equilibrium model simulating the agricultural sector and the biogas industry in Lombardy, under two alternative subsidization schemes. Results show that policy measures implemented in 2013 – reducing the average subsidy per kWh – may contribute to enforce the sustainability of the sector and decreasing its competition with agri-food chains: Maize demand for biogas would decrease, compared to the old scheme, lessening the market clearing price and reducing land demand for energy purposes
On the Structuring of Reliable Multicast Protocols for Mobile Wireless Computing
No full textWe consider reliable multicast in distributed systems including mobile hosts (MHs) that
communicate with a wired infrastructure by means of wireless links. Nearly all existing proposals
are based on hand-off, i.e. whenever a MH switches cell, state information about this host travels
across the wired network from the support station of the old cell to that of the new cell. However, we
are not aware of any detailed performance analysis for hand-off based reliable multicast protocols:
previous research in this area has focused mainly on correctness rather than on performance.
We analyze in detail, by simulation, the performance of a proposal by Acharya and Badrinath
that is based on hand-off and has been highly influential in the design of later protocols. Then, we
compare this proposal with one by us that is based on an entirely different philosophy and is the
only existing proposal not based on hand-off. Surprisingly, we found that our proposal outperforms
the one by Acharya and Badrinath in all the aspects considered: latency, scalability, bandwidth
usage efficiency and quickness in managing cell switches of MHs. Moreover, we found that this
performance improvement is not obtained at the expense of increased resource requirements on
MHs such as energy or memory. We believe that this performance and cost analysis allows us to
gain insights into the design of reliable multicast protocols for distributed mobile systems
«Scriptorum seu verius pictorum». La scrittura dei corali
No full textIl saggio prende in considerazione le due serie di corali (datate, rispettivamente, alla fine del XIII e al principio del XIV) riferibili al convento dei Predicatori di S. Domenico. Valorizzando le descrizioni archeologiche dei codici, viene proposta un'inedita ipotesi circa la tecnica di esecuzione della scrittura di quei libri monumentali
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
Robust deformation capture from temporal range data for surface rendering
No full textImagine an object such as a paper sheet being waved in front of some sensor. Reconstructing the time-varying 3D shape of the object finds direct applications in computer animation. The goal of this paper is to provide such a deformation capture system for surfaces. It uses temporal range data obtained by sensors such as those based on structured light or stereo. So as to deal with many different kinds of material, we do not make the usual assumption that the object surface has textural information. This rules out those techniques based on detecting and matching keypoints or directly minimizing color discrepancy. The proposed method is based on a planar mesh that is deformed so as to fit each of the range images. We show how to achieve this by minimizing a compound cost function combining several data and regularization terms, needed to make the overall system robust so that it can deal with low quality datasets. Carefully examining the parameter to residual relationship shows that this cost function can be minimized very efficiently by coupling nonlinear least squares methods with sparse matrix operators. Experimental results for challenging datasets coming from different kinds of range sensors are reported. The algorithm is reasonably fast and is shown to be robust to missing and erroneous data points
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