1,720,972 research outputs found
Le medie imprese di fronte alla crisi: il caso Meccanotecnica Umbra S.p.A.
Full text linkScope of the present work is to analyze how Meccanotecnica Umbra S.p.A. has attempted to cope with the current global economic crisis. Meccanotecnica Umbra S.p.A. is a world renowned producer of mechanical seals, covering 35% of the world automotive industry and 65% of the European household appliance market. In 2010, Meccanotecnica ranked first among the most dynamic senior companies according to Mediobanca. Since 2000, the Group has pursued an intense internationalization and diversification strategy, entering the chemical, pharmaceutical, paper and food industries. It is currently present in every continent, owning both distribution channels and production plants. Meccanotecnica has paid particular attention to technological innovation, through which it has achieved complete automation and control in the production process. Furthermore, investments in plant and product innovation, combined with strong embeddedness in the local community, have also contributed to its positive results notwithstanding the economic crisis. The present study has adopted a qualitative approach based on a field case study. Diverse and complementary data gatherin
Unravelling the Structure of Protic Ionic Liquids with Theoretical and Experimental Methods: Ethyl-, Propyl- and Butylammonium Nitrate Explored by Raman Spectroscopy and DFT Calculations
No full text
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
A combined theoretical and experimental study of solid octyl and decylammonium chlorides and of their aqueous solutions
No full textThe analysis of the thermal behavior of octyl-(OAC) and decylammonium chloride (DAC) has provided relevant new information. OAC shows a polymorphic phase transition that starts at 308 K and is completed at 313 K, between a monoclinic and a tetragonal structure, which belongs to a space group different from what was observed for other alkylammonium chlorides. At the melting temperature (463 K), the growing of a strong first sharp diffraction peak (FSDP) occurring at a d-spacing of Ca. 21.0 angstrom was observed. DAC is characterized by two phase transitions at 318 (T-d1) and 323 K (T-d2). At T-d1, the LT polymorph coexists with a new-formed phase. At T-d2 the LT polymorph is replaced by a further polymorphic modification of DAC that becomes the only one at 328 K. This second phase transition signals the occurrence of a phase, closely related to the LT polymorph of HeAC, that crystallizes in the tetragonal crystal system a = ca. 5.00 angstrom and c = ca. 28.5 angstrom, P4/nmm space group. DAC melting starts at 458 K and is accompanied, as in the case of OAC, by the growing of a strong FSDP at a d-spacing of ca. 24.8 angstrom. A parallel DSC study confirmed the above-mentioned transitions. In addition, the structural properties of OAC/water and DAC/water mixtures were studied using an integrated approach, which combines X-ray diffraction and molecular dynamics (MD) techniques. A very good agreement between theoretical and experimental diffraction patterns has been obtained for both investigated mixtures. A thorough analysis of the MD trajectories shows that strong anion-water interactions are present in the mixtures, where Cl- forms a rather unstructured first hydration shell of water molecules bound to the anion in a linear Cl center dot center dot center dot H-O configuration. Moreover, cations and anions were found to interact with each other, and to form "solvent-shared ion pairs", in which one or more water molecules are shared between Cl- and the alkylammonium cation
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
Conformational isomerisms and nano-aggregation in substituted alkylammonium nitrates ionic liquids: An x-ray and computational study of 2-methoxyethylammonium nitrate
No full textIn this study, we discuss, using molecular dynamics simulations and energy-dispersive x-ray
diffraction data, how a conformational isomerism can dramatically alter the nanosegregation
phenomena that take place in a prototypical ionic liquid. The diffraction patterns of liquid
2-methoxyethylammonium nitrate are compared with the results from molecular dynamics simulations. The simulations conditions and force field parameters have been varied producing different
charge models and different populations of conformers of the cation. We show that, while the short
range structure is relatively unchanged in the models, the long range aggregation phenomena deemed
responsible for the appearance of low Q peaks in the X-ray patterns strongly depend on the choice
of the charge model. In the title compound, the best agreement with the experiment, where no low Q
peaks appear, occurs if the point charges are calculated using the gauche conformation of the cation,
which is characterized by an intramolecular hydrogen bond between ammonium and ether groups
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