1,720,956 research outputs found
Applicazione degli enzimi nella tintura della lana
Full text linkIn questo lavoro è stata studiata la possibilità di ridurre la temperatura di tintura convenzionale della lana mediante l’impiego di enzimi proteolitici. Differenti proteasi di origine batterica sono state testate al fine di migliorare l’accessibilità del colorante alla fibra anche a basse temperature. Per ogni tintura sono state determinate le curve di esaurimento del colorante nel bagno di tintura.
I campioni tinti sono stati sottoposti ad una valutazione di danneggiamento mediante osservazione al microscopio elettronico a scansione e a prove dinamometriche per valutare la perdita di carico di rottura ed allungamento. Inoltre, i campioni tinti sono stati sottoposti a prove di solidità ad umido e alla luce, parametro molto importante perché legato alla qualità del materiale ottenuto
Cotton and polyester textiles finishing by sol-gel technique
No full textCurrent efforts of research in the field of textile materials are focused on surface functionalization, by innovative and cost effective processes, to obtain products with new or improved properties and high added value that can widen their industrial application. The interest is focused on flame retardancy, UV-protection, resistance to weathering and microbiological attack, super-hydrophobicity and soil resistance. High finishing durability, high degree of homogeneity and superior chemical-physical properties coupled with a reduction of harmful compounds in textile finishing industry can be reached by the application of an hybrid inorganic-organic coating by sol-gel techniques[1-3]. The aim of this work is to confer a hydrophobic behaviour to cotton and polyester fabrics depositing a modified silica based film by sol-gel technique. Sol gel coatings were prepared mixing tetraetoxysilane-based sols with low amounts of hydrophobic additives (n-propyltrimethoxysilane, hexadecyltrimetoxysilane, 1H,1H,2H,2H–Fluorooctyltriethoxysilane). Moreover a LTP, low temperature plasma, pre-treatment was carried out on fabrics to improve the sol gel coating adhesion and fastness. Treated fabrics were characterized by SEM, FTIR and XPS while their wettability was evaluated by measuring the water contact angle. Best results were obtained with a TEOS/FOS combination (θ=148°) for polyester and TEOS/C16 for cotton (θ=140°). The enhanced coating adhesion, due to plasma surface activation, was confirmed by abrasion and washing fastness tests
Hydrophobic sol-gel finishing for textiles: Improvement by plasma pre-treatment
No full textThe surface of cotton (COT) and polyester (PET) fabrics was modified to create a water-repellent finishing by depositing
a modified silica-based film using the sol-gel technique. TEOS (tetraethoxysilane)-based physically modified sols with 2%
and 11% on weight fabric (o.w.f.) of hydrophobic additives were tested. N-propyltrimethoxysilane (C3), hexadecyltrimethoxysilane
(C16) and 1H,1H,2H,2H-fluorooctyltriethoxysilane (FOS) were investigated as additives.
Furthermore, a low-temperature plasma pre-treatment was used to activate the COTand PET fabric surface to improve
the sol-gel coating adhesion, resistance to abrasion and fastness to washing stresses.
A complete chemical/morphological (Fourier transform infrared, X-ray photoelectron spectroscopy, scanning electron
microscopy) and physical characterization (abrasion and air permeability test) of treated samples was carried out. High
values of y (around 140) on PET and COT samples were obtained with all additives used (C3, C16 and FOS) even at a
low concentration (2%). Due to plasma pre-treatment, interesting water-repellent properties were achieved for PET
(y1⁄4148) treated with TEOS/FOS molar ratio 0.63 and for COT (y1⁄4140) with TEOS/C16 molar ratio 0.63. The
enhanced coating adhesion, due to plasma surface activation, was confirmed by abrasion and washing tests
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
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