1,720,983 research outputs found
Pyrazolate and Imidazolate Coinage Metals Metallocycles. New Developments on the Study of their synthesis, characterization and peculiar properties
No full textTheoretical investigations of supramolecular chemisorption adducts of volatile small molecules with a trinuclear silver(I) nitrated pyrazolate complex: DFT modeling of dipole-quadrupole interactions
Full text linkTheoretical investigations of supramolecular chemisorption adducts of volatile small molecules with a trinuclear silver(I) nitrated pyrazolate complex: DFT modeling of dipole-quadrupole interactions
Sammer M Tekarli1, [email protected], Vladimir N Nesterov1, Mohammad A Omary1, Rossana Galassi2, Simone Ricci2, Alfredo Burini2. (1) Department of Chemistry, University of North Texas, Denton, Texas 76203, United States, (2) School of Science and Technology, University of Camerino - Via Sant’Agostino, Camerino, Macerata I-62032, Italy
A comparative study on the tendency of a new trinuclear silver(I) pyrazolate, namely [N,N-(3,5-dinitro-pyrazolate)Ag]3 (1) and a similar compound known previously, [N,N-(3,5-bis(trifluoromethyl)pyrazolate)Ag]3 (2) to adsorb small volatile molecules was performed. It was found that 1 has a remarkable tendency to form adducts, at room temperature and atmospheric pressure, with acetone, acetylacetone, ammonia, pyridine, acetonitrile, triethylamine, dimethylsulfide, and tetrahydrothiophene while CO, THF, alcohols, and diethyl ether were not adsorbed. On the contrary, 2 did not undergo adsorption of any of the aforementioned volatile molecules. Density Functional Theory (DFT) results (polarizability, electrostatic potential profiles, kinetics and thermodynamics, and positive point charge calculations) are consistent with the chemisorption model, explain the experimental adsorption selectivity for 1, and the lack of similar adsorption by 2 upon proper selection of the density functional. The M06 method in conjunction with CEP-31G basis set provides good agreement with the experimental data both qualitatively and quantitatively compared to B3LYP/CEP-31G. The results suggest that the adsorption of Lewis basic vapors occurs mainly by kinetic effects. The high vs. low binding energies calculated for the adducts of 1 with acetonitrile vs. CO manifest the experimental findings. The findings in this project suggest that this class of quadrupolar macromolecular complexes may exhibit potential for toxic industrial chemical (TIC) removal applications already known for porous organic polymers
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
Ex post and insurance-based compensation fail to increase tolerance for wolves in semi-agricultural landscapes of central Italy
No full textRange expansion by large carnivores in semiagricultural landscapes represents a serious challenge for managing human-carnivore conflicts. By focusing on an area of recent re-colonization by wolves in central Italy, where livestock owners lost traditional husbandry practices to cope with wolves, we assessed an ex post and a subsequent insurancebased compensation program implemented from 1999 to 2013. We cross checked official depredation statistics and
compensation records from various registries, complementing them with a questionnaire survey of sheep owners. Compared to ex post compensation (1999–2005), under the insurance program (2006–2013) compensation paid annually dropped on average by 81.1 %, mostly reflecting that only 4.6 (±0.7
SD)% of sheep owners stipulated the insurance annually. Officially, only 5.5 % of active sheep owners were annually afflicted by wolf depredation during the insurance scheme, but we estimated this proportion to be as high as 34.3 % accounting for the proportion of affected sheep owners who did not officially claim depredations. Coupled with substantial retaliatory killing (minimum of five wolves killed/year), this large amount of cryptic conflict is a symptom of distrust by livestock owners of past and current conflict mitigation policies, despite more than two decades of compensation. We conclude that compensation may fail to improve tolerance toward carnivores unless it is integrated into participatory processes and that lack of reliable data on depredations and damage mitigation strategies exacerbates the conflict. Being advocates of the evidence-based paradigm in management, scientists share a key responsibility in providing objective data concerning progress of conflict management
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
Giustizia, diritti umani e sostenibilità. Le scienze politiche di fronte alle sfide globali e ai mutamenti epocali.
No full textLe esperienze costituzionali andine e la definizione di un paradigma alternativo alla Western Legal Tradition
No full textDispelling 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
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