1,721,283 research outputs found
Accessing Unexplored Supramolecular Trajectories through Mechanochemistry
Full text link[Formula presented]Luca Catalano received his Bachelor's in Chemistry from the University of Milan (2011) and his MS in Photochemistry and Molecular Materials from the University of Bologna, working with Professor Dario Braga (2013). He then earned his PhD in supramolecular chemistry from the Polytechnic University of Milan under the supervision of Professor Pierangelo Metrangolo (2017). After a first postdoctoral appointment at New York University Abu Dhabi, working with Professor Panče Naumov on molecular crystalline materials, he joined the lab of Professor Andy Cooper at the University of Liverpool, where he is currently Postdoctoral Research Associate working on porous liquids and crystals
Propagation techniques and nursery management for the production of certified peach plants in Europe
No full textThe propagation of fruit trees, particularly peaches, nectarines and canning
clingstone, has reached highly specialized levels since the 1960s. Over the years, the
classic seed rootstocks have been replaced by numerous rootstocks produced in vitro,
expanding the range of technical solutions for the different soil and climatic growing
conditions of several areas. Thanks to the new genotypes from international breeding
programs, it was thus possible to renew the cultivated varietal platform several times.
Propagation techniques have also undergone an evolution, adopting solutions aimed at
shortening nurseries’ production cycles by using June budding or micrografting.
Finally, there are different types of plants available for peach growers. Bare root plants,
potted trees of different sizes with several mixture also activated by bio agents are
suitable for the different growing and training systems to be adopted. In order to
guarantee trueness to type and plant health and to counteract the introduction and
spread of dangerous harmful organisms in Europe, at EU level, production and
marketing of plant propagation materials is also regulated by mandatory standards for
peach trees, although it is possible to join to voluntary certification schemes which
ensure higher guarantee to the plants. All these issues are being discussed in the
current article
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
The importance of a full 3D fluid dynamic analysis to evaluate the flow forces in a hydraulic directional proportional valve
No full textPurpose – The purpose of this paper is to present a full 3D Computational Fluid Dynamics (CFD)
analysis of the flow field through hydraulic directional proportional valves, in order to accurately
predict the flow forces acting on the spool and to overcome the limitations of two-dimensional (2D) and
simplified three-dimensional (3D) models.
Design/methodology/approach – A full 3D CAD representation is proposed as a general approach
to reproduce the geometry of an existing valve in full detail; then, unstructured computational grids,
which identify peculiar positions of the spool travel, are generated by means of the mesh generation
tool Gambit. The computational grids are imported into the commercial CFD code Fluent, where
the flow equations are solved assuming that the flow is steady and incompressible. To validate the
proposed computational procedure, the predicted flow rates and flow forces are compared with
the corresponding experimental data.
Findings – The superposition between numerical and experimental curves demonstrates that the
proposed full 3D numerical analysis is more effective than the simplified 3D flow model that was
previously proposed by the same authors.
Practical implications – The presented full 3D fluid dynamic analysis can be employed
for the fluid-dynamic design optimization of the sliding spool and, more generally, of the internal
profiles of the valve, with the objective of reducing the flow forces and thus the required
control force.
Originality/value – The paper proposes a new computational strategy that is capable of recognizing
all 3D geometrical details of a hydraulic directional proportional valve and that provides a significant
improvement with respect to 2D and partially 3D approaches
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