1,720,957 research outputs found
Cocrystallisation of trimethylchloro-stannane with a distannoxane
No full textMitzel NW, Lustig C, Scharfe S. Cocrystallisation of trimethylchloro-stannane with a distannoxane. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES. 2001;56(4-5):440-442.Partial hydrolysis of a mixture of Me2SnCl2 and Me3SnCl affords an aggregate of the composition [Sn2Cl(O)(OSnMe3)(Me)(4)](2) which cocrystallises with two equivalents of Me3SnCl to form endless bands of ([Sn2Cl(O)(OSnMe3)(Me)(4)](2). 2Me(3)SnCl)(infinity) linked through Sn . . . Cl intermolecular contacts
Somnoendoskopie
No full textackground Early studies report on different calibers of the mesopharynx opening in the states of wakefulness and sedation. Objectives Is it possible to manipulate the widening of the mesopharyngeal isthmus by particular maneuvers in the states of wakefulness and sedation? Methods The mesopharyngeal isthmus of 50 healthy subjects was examined endoscopically in wakefulness and under sedation. The intraoral negative pressure was controlled by a vacuum activator. The following maneuvers were performed and widening of the isthmus was documented pictorially: spontaneous breathing with closed lips (SB), mandibular advancement (MA), tongue repositioning maneuver (TRM), and mandibular advancement combined with TRM (MA, TRM). While performing the tongue repositioning maneuver with closed lips, the tongue is adapted closely to the row of teeth and also to the hard and soft palate. Results In wakefulness, 123 endoscopic pictures were analyzed, 35 with SB, 34 with MA, 35 with TRM, 19 with TRM and MA. In sedation there were 125 pictures, 35 with SB, 32 with MA, 34 with TRM, 24 with TRM and MA. The results represent that in sedation the TRM has a significant widening effect on the opening of the mesopharyngeal isthmus compared to SB without TRM (p < 0.05). Compared to SB in sedation, the combined maneuver of TRM and MA had an additional effect on the widening of the mesopharyngeal isthmus (p < 0.05). Conclusions In sedation, the mesopharyngeal isthmus is stabilized by the TRM and the combined maneuver with MA and TRM because of the forward displacement of the tongue out of the pharynx with closed contact to the hard palate and apposition of the velum to dorsum of the tongue.Hintergrund. Frühere Studien berichten über unterschiedlicheWeitstellungen des Mesopharynx im Wachzustand und in Sedierung. Fragestellung. Lässt sich der mesopharyngeale Isthmus imWachzustand und in Sedierung durch bestimmteManöver beeinflussen? Material und Methoden. Bei 50 gesunden Probanden (18 m, 32 w) wurde der mesopharyngeale Isthmus imWachzustand und in Sedierung endoskopisch untersucht und der intraorale Unterdruckmit einemVakuumaktivator kontrolliert. Folgende Manöver wurden durchgeführt und dabei der Isthmus bildlich dokumentiert: Spontanatmungmit anteriorem Lippenschluss (SA), Unterkieferprotrusion (UP), Zungenrepositionsmanöver (ZRM), Unterkieferprotrusion mit ZRM (UP, ZRM). Während des ZRM ist – bei geschlossenen Lippen – die Zunge an den Zahnreihen, den Hartgaumen und an das Velum angelagert. Ergebnisse. Im Wachzustand wurden 123 Bilder analysiert, davon 35 mit SA, 34 mit UP, 35 mit ZRM, 19 mit ZRM und UP. In Sedierung waren es 125, davon 35 mit SA, 32 mit UP, 34 mit ZRM, 24 mit ZRM und UP. Die Resultate zeigen, dass in Sedierung das ZRM einen signifikant erweiternden Effekt auf die Weite des mesopharyngealen Isthmus imVergleich zur sedierten SA ohne ZRM (p < 0,05) hatte. Das kombinierteManöver mit ZRM und UP hatte im Vergleich zur sedierten SA einen additiven Effekt auf die Weitstellung des mesopharyngealen Isthmus (p < 0,05). Schlussfolgerung. In Sedierung wird mittels ZRM und kombiniertemManöver mit UP und ZRM der mesopharyngeale Isthmus durch Vorverlagerung der Zunge aus dem Pharynxraum mit enger Zungengaumenkontaktposition sowie durch Anlagerung des Velums am Zungenrücken stabilisiert
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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