1,721,033 research outputs found
Erratum: Redox Switchable Thianthrene Cavitands (Synthesis (Germany) DOI: 10.1055/s-0036-1588659)
No full textThere is a mistake in Figure 8 and 9 (protonated sulfur). The correct Figures are shown below. (Figure presented). There is also a mistake in the HRMS data of cavitand 1. It should read: HRMS (MALDI) m/z calculated for C108H89N8O8S8 [M+H]+: 1882.46; found: 1882.61
Molecular Conformation and Magnetic Behavior of Macrocyclic Columnar Liquid Crystals
No full textWe report the results of deuterium NMR experiments performed on macrocyclic columnar mesogens. The columnar hexagonal mesophase, aligned in a static magnetic field, exhibits an unusual positive anisotropy of the diamagnetic tensor so that the column axes tend to orient themselves parallel to the direction of the applied field. A different kind of alignment can be detected when, by rotating the sample, the average columnar axes direction is made perpendicular to the field: the molecular cores tend to orient their long axis perpendicular to the field direction. This is the first case, to our knowledge, where a field-induced transversal alignment is observed in columnar mesophases. This peculiar alignment allowed the assignment of the flattened cone conformation to the macrocyclic core in the mesophase. © 1994 American Chemical Society
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Novel Vacuum Evaporated Cavitand Sensors for Detecting Very Low Alcohol Concentrations
No full textHigh vacuum evaporation (VE) is used for the first time to grow thin films of novel tetraphosphonate, Tiiii[H, CH3, Ph], and tetrathiophosphonate, TSiiii[H, CH3, Ph], cavitands for gas sensing applications. The sensing capabilities of the samples were investigated by exposing Tiiii- and TSiiii-coated QCMs to very low concentrations of ethyl alcohol. The sensitivity, the speed (t50 = 5 s for both the samples) and the detection limit (0.4 ppm for Tiiii and 2.5 ppm for TSiiii) of the samples were determined, indicating highly competitive sensing capabilities. © 2010 Springer Science+Business Media B.V
Variations on the Author
Get PDF“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
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