1,720,990 research outputs found
Chiral [2.2]paracyclophane Derivatives as suitable ligands of metal catalysts for stereoselective syntheses
No full textA new approach to condensed homo- and heteroaromatics based on Ceric Ammonium Nitrate oxidative addition of 3-substituted 1-trimethyl silyloxycyclohexenes to Ethyl Vinyl Ether
No full textUn nuovo approccio alla sintesi di chetoni policiclici insaturi basato sull’addizione ossidativa di silil enol eteri all’etil vinil etere
No full textSynthesis and Far-UV Circular Dichroism Spectra Analysed by Coupled Oscillator Calculations of Some New 4-Substituted [2.2]Paracyclophanes
No full textUn facile accesso a benzofurani regioselettivamente sostituiti basato sull’addizione ossidativa di 1-trimetilsililossicicloeseni e 2-trimetilsililossi-1,3-cicloesadieni a vinil etil eteri promossa dal Cerio (IV) Ammonio Nitrato
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
B-Values as a Sensitive Measure of Steric Effects
No full textAccurate torsional barriers of 15 ortho-substituted biphenyls have been determined computationally using the B3LYP density functional and experimentally by variable-temperature ("dynamic") nuclear magnetic resonance. Taking advantage of the
3'-isopropyldimethylsilyl group as a novel and superior diastereotopicity probe and tracking coalescence temperatures down to –173 °C (100 K), activation energies of aryl-aryl rotation as small as 5 kcal/mol can be assessed. The 2-X/2'-H repulsion increments thus derived are powerful parameters for rationalizing and predicting the conformational behavior of aromatic compounds carrying ortho-substituent
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
- …
