1,721,083 research outputs found
Preparation and crystal structure of the boranehydrazine complex [RuCl(κ1-NH2NH2BPh3){P(OEt)3}4]BPh4
No full textUnlike what was previously reported, the reaction of the hydrazine derivative [Ru(NH2NH2)2{P(OEt)3}4](BPh4)2 with p-tolyldiazonium tetrafluoroborate in CH2Cl2 afforded the boranehydrazine complex [RuCl(κ1-NH2NH2BPh3){P(OEt)3}4]BPh4. The complex was characterised spectroscopically (IR and NMR) and by X-ray crystal structure determination
Synthesis and structure of the mixed phosphito-phosphine cation complex [Ru(η5-C5H5)(CO)(PPh3)P(OMe)3]BPh4
No full textHydrolysis of the vinylidene complex [Ru(η5-C5H5)=C=C(H)Ph (PPh3)P(OMe)3]BPh4 afforded the mixed-ligands carbonyl derivative [Ru(η5-C5H5)(CO)(PPh3)P(OMe)3]BPh4. Its structure has been determined by X-ray diffraction. The compound crystallizes in the monoclinic crystal system, space group P21/c, with one anion and one cation in the asymmetric unit. The cation complex contains a ruthenium atom in a half-sandwich piano-stool structure. One trimethylphosphito, one triphenylphosphine and one carbonyl ligand are the legs of the stool
On the role of textual connectives in sentence comprehension: A new dataset for Italian
Full text linkIn this paper we present a new evaluation resource for Italian aimed at assessing the role of textual connectives in the comprehension of the meaning of a sentence. The resource is arranged in two sections (acceptability assessment and cloze test), each one corresponding to a distinct challenge task conceived to test how subtle modifications involving connectives in real usage sentences influence the perceived acceptability of the sentence by native speakers and Neural Language Models (NLMs). Although the main focus is the presentation of the dataset, we also provide some preliminary data comparing human judgments and NLMs performance in the two task
Jetter and Post Nuclear Fusion Cycles: New Fire to an Old Idea
No full textNew calculations of the time evolution and isotopic composition for a network of nuclear reactions breathe new life into an old idea in nuclear fusion, burning solid room-temperature 6Li deuteride (6LiD) with neutrons. Modern-day compilations of nuclear cross sections are nowadays available, and we use them to predict the full course of networks of thermonuclear reactions, reexamining the Jetter (n + 6Li) and Post cycles (p + 6Li), named after U. Jetter and R. F. Post, that offer great prospects for energy production in devices not based on plasma confinement. We present ideal calculations, i.e. not including the energy loss due to the stopping power, and more realistic calculations that include the Bethe-Bloch formula. We find that a significant amount of energy can, in principle, be generated
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
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