1,720,955 research outputs found
Amorphous WO3 Films via Chemical Vapor Deposition from Metallorganic Precursors Containing Phosphorus Dopant.
No full textAmorphous WO3 films, doped with phosphorus, have been synthesized by chemical vapor deposition of volatile, low-melting P-substituted tungsten carbonyls. The presence of a small quantity of dopant released by the precursor during its decomposition is sufficient to inhibit the crystallization of the tungsten oxide on the matrix (P/W 2-4 atom % on Si(100) and ca. 10 atom % on KGlass). The nature of the film is scarcely affected by the experimental conditions of deposition (namely p(O2) partial pressure) and the quantity of the P dopant is properly tuned by an appropriate choice of the molecular precursor, being in the order W(CO)(4)[P(OEt)(3)](2) (P/W 1/1) > W-2(mu-PR2)(2)(CO)(8) (P/W 1/4) > W(CO)(4)(PEt3)(2) (P/W 1/10 on KGlass, 1/30 on Si). The films on KGlass exhibit interesting electrochromic properties with a maximum efficiency of 66 cm(2)/C
Nuove procedure di sintesi nel campo metallorganico: formazione di legami Sn-C e Sn-Sn in H2O(NH4Cl) / Solvente organico / Zn
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
Efficacy of yeast extracts in the containment of some grapevine diseases
No full textreservedLa coltivazione della vite è soggetta all’attacco da parte da funghi patogeni e oomiceti che portano sia a scadimenti quantitativi nella resa delle uve, che a scadimenti qualitativi nella successiva produzione di vino. I due principali agenti patogeni dei nostri areali sono il fungo polifago Botrytis cinerea e l’oomicete Plasmopara viticola, rispettivamente agenti causali di marciume grigio e peronospora della vite. I principali metodi di difesa prevedono l’utilizzo di prodotti fitosanitari di sintesi.
In un’ottica di difesa integrata e di difesa biologica con lo scopo di ridurre l’uso di prodotti fitosanitari causa la politica comunitaria, l’opinione pubblica, lo sviluppo di resistenze e problemi tossicologici ed ecologici, sono stati sperimentati negli anni diversi prodotti di origine naturale. Tra queste molecole di origine naturale è interessante l’impiego di estratti di lievito allo scopo di indurre le difese della vite. Alcuni di questi prodotti basati su estratti di lievito sono già disponibili in commercio, ma ad oggi non sono ancora ben noti i meccanismi di azione di questi prodotti, la reale efficacia e le possibili aree di impiego.
Questo lavoro si propone di andare a valutare l’efficacia di diversi estratti di lievito ottenuti con diverse tecniche di produzione e di estrazione contro P. viticola e B. cinerea in ambiente controllato. Allo stesso tempo l’efficacia contro le suddette malattie dei diversi estratti di lievito è confrontata con l’efficacia di un preparato commerciale a base di estratti di lievito. Inoltre, viene valutata l’efficacia di un prodotto commerciale contenente estratto di lievito in pieno campo.
Dai risultati ottenuti a livello laboratoriale si capisce la potenzialità di questi prodotti e l’efficacia che diversi estratti di lievito possono avere rispetto a quelli che si trovano commercialmente. In campo, i risultati ottenuti non sono stati paragonabili a quelli ottenuti in ambiente controllato, questo anche a causa della difficile annata nel contenimento delle due malattie. Si deduce che la ricerca sugli estratti di lievito come prodotti per indurre le resistenze della vite e di altre colture debba continuare, attraverso sperimentazioni sia in scala laboratoriale che in pieno campo
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
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