1,720,962 research outputs found
Clip-off Chemistry Applied to the Synthesis of Rh(II)-based Complexes via Rational Cleavage of Metal-Organic-Polyhedra
Full text linkLes innovacions en mètodes sintètics han permès, al llarg de la història, descobrir nous materials i molècules. Cada nova reacció o metodologia sintètica no només ajuda a expandir el catàleg de materials i molècules sinó que també inspira noves maneres de pensar i innovar en estratègies sintètiques. Avui en dia, els mètodes sintètics més comuns consisteixen en la formació d'enllaços creant estructures més grans i complexes a partir d'unitats més petites. L'objectiu d'aquesta Tesi és explorar una nova metodologia sintètica anomenada "Clip-off-Chemistry". Aquest nou mètode sintètic consisteix a generar nous materials i molècules a través del trencament selectiu i racional d'enllaços covalents d'un material reticular proporcionant un control espacial precís de l'estructura final. Aquest trencament controlat d'enllaços es dona a escala molecular a través de l'ozonólisi d'enllaços dobles. En aquesta Tesi hem dut a terme la síntesi dels primers productes per "Clip-off Chemistry". Concretament ens hem centrat en el trencament de poliedres metal·loorgànics (MOPs) alliberant diversos compostos de coordinació.Las innovaciones en métodos sintéticos han permitido, a lo largo de la historia, descubrir nuevos materiales y moléculas. Cada nueva reacción o metodología sintética no solo ayuda a expandir el catálogo de materiales y moléculas, sino que también inspira nuevas maneras de pensar e innovar en estrategias sintéticas. Hoy en día, los métodos sintéticos más comunes consisten en la formación de enlaces creando estructuras más grandes y complejas a partir de unidades más pequeñas. El objetivo de esta Tesis es explorar una nueva metodología sintética denominada "Clip-off-Chemistry". Este nuevo método sintético consiste en generar nuevos materiales y moléculas a través de la rotura selectiva y racional de enlaces covalentes de un material reticular proporcionando un control espacial preciso de la estructura final. Esta rotura controlada de enlaces se da a escala molecular a través de la ozonólisis de enlaces dobles. En esta Tesis hemos llevado a cabo la síntesis de los primeros productos por "Clip-off Chemistry". Concretamente nos hemos centrado en la rotura de poliedros metalorgánicos (Rh-MOPs) liberando varios compuestos de coordinación.Innovations in chemical synthesis have historically led to the discovery of new materials and molecules. Each new reaction and methodology not only expand the accessible chemical space but also inspires researchers to explore novel ways of thinking and further innovate in the iterative design and preparation of new chemical targets. The most common synthetic approaches involve bottom-up strategies, where bonds link atoms or molecules to form larger compounds. In this Thesis, our aim is to explore a new approach to develop a novel synthetic methodology called Clip-off Chemistry. This new synthetic strategy aims to generate new materials and molecules by selectively and rationally cleaving covalent bonds in reticular materials, providing precise spatial control over the final structure. This controllable bond cleavage occurs at the molecular level through the ozonolysis of alkene bonds. Within this Thesis, our focus is to show the synthesis of the first products made using ";Clip-off Chemistry"; herein, through the cleavage of Rh-Metal-Organic Polyhedra (MOPs), releasing coordination compounds that would otherwise be inaccessible by direct synthesis
Clip-off Chemistry Applied to the Synthesis of Rh(II)-based Complexes via Rational Cleavage of Metal-Organic-Polyhedra
Full text linkLes innovacions en mètodes sintètics han permès, al llarg de la història, descobrir nous materials i molècules. Cada nova reacció o metodologia sintètica no només ajuda a expandir el catàleg de materials i molècules sinó que també inspira noves maneres de pensar i innovar en estratègies sintètiques. Avui en dia, els mètodes sintètics més comuns consisteixen en la formació d'enllaços creant estructures més grans i complexes a partir d'unitats més petites. L'objectiu d'aquesta Tesi és explorar una nova metodologia sintètica anomenada "Clip-off-Chemistry". Aquest nou mètode sintètic consisteix a generar nous materials i molècules a través del trencament selectiu i racional d'enllaços covalents d'un material reticular proporcionant un control espacial precís de l'estructura final. Aquest trencament controlat d'enllaços es dona a escala molecular a través de l'ozonólisi d'enllaços dobles. En aquesta Tesi hem dut a terme la síntesi dels primers productes per "Clip-off Chemistry". Concretament ens hem centrat en el trencament de poliedres metal·loorgànics (MOPs) alliberant diversos compostos de coordinació.Las innovaciones en métodos sintéticos han permitido, a lo largo de la historia, descubrir nuevos materiales y moléculas. Cada nueva reacción o metodología sintética no solo ayuda a expandir el catálogo de materiales y moléculas, sino que también inspira nuevas maneras de pensar e innovar en estrategias sintéticas. Hoy en día, los métodos sintéticos más comunes consisten en la formación de enlaces creando estructuras más grandes y complejas a partir de unidades más pequeñas. El objetivo de esta Tesis es explorar una nueva metodología sintética denominada "Clip-off-Chemistry". Este nuevo método sintético consiste en generar nuevos materiales y moléculas a través de la rotura selectiva y racional de enlaces covalentes de un material reticular proporcionando un control espacial preciso de la estructura final. Esta rotura controlada de enlaces se da a escala molecular a través de la ozonólisis de enlaces dobles. En esta Tesis hemos llevado a cabo la síntesis de los primeros productos por "Clip-off Chemistry". Concretamente nos hemos centrado en la rotura de poliedros metalorgánicos (Rh-MOPs) liberando varios compuestos de coordinación.Innovations in chemical synthesis have historically led to the discovery of new materials and molecules. Each new reaction and methodology not only expand the accessible chemical space but also inspires researchers to explore novel ways of thinking and further innovate in the iterative design and preparation of new chemical targets. The most common synthetic approaches involve bottom-up strategies, where bonds link atoms or molecules to form larger compounds. In this Thesis, our aim is to explore a new approach to develop a novel synthetic methodology called Clip-off Chemistry. This new synthetic strategy aims to generate new materials and molecules by selectively and rationally cleaving covalent bonds in reticular materials, providing precise spatial control over the final structure. This controllable bond cleavage occurs at the molecular level through the ozonolysis of alkene bonds. Within this Thesis, our focus is to show the synthesis of the first products made using ";Clip-off Chemistry"; herein, through the cleavage of Rh-Metal-Organic Polyhedra (MOPs), releasing coordination compounds that would otherwise be inaccessible by direct synthesis.Universitat Autònoma de Barcelona. Programa de Doctorat en Químic
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
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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