1,721,013 research outputs found
Analysis of chattering phenomenon in industrial S6-high rolling mill
No full textChatter in rolling mills is the undesirable vibration observed in most of the rolling mills operating at high speed and rolling thin strip. In this work the authors discuss some problems relative to the vibrations occurring in a S6-high cold rolling mill. It can result in not good surface finish for some applications and, rare cases, in gauge variations in the rolled strip and it is considered to be the result of interaction between rolling mill structure and rolling-process. Three basic types of chatter can be classified in rolling mills: torsional, third-octave mode, and fifth-octave-mode chatter.
S6-high rolling mill is an innovative mode to work the steel: it allows the use of very small work rolls laterally guided by individually adjustable side support rolls, which are supported by two rows of roller bearings mounted in cassettes. It has six rolls able to roll steel strip coming directly from hot rolling mill train.
A proposed solution based on empirical observations, vibration analysis and considerations of a model is described with the aim to improve the quality of the product and increasing production
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
Selective growth and expansion of human corneal epithelial basal stem cells in a three-dimensional-organ culture
No full textWe report on a three dimensional (3D)-organotypic culture in vitro for selective growth and expansion of human corneal epithelial stem cells. Limbal corneal explants were cultured on porous collagen sponges submerged in Epilife medium containing 10% fetal bovine serum. The fragments were analyzed by immunohistochemistry for the expression and distribution of a spectrum of corneal epithelium markers: p63, CK-19, CK-3, Ki-67, pan-cytokeratins and vimentin. Early in culture the epithelium began to exfoliate losing its differentiated high-zone layers into the medium, maintaining only basal and few parabasal cells (mostly both p63 and CK-19 positive), which had remained attached to the specimen. After 14 days a new epithelium was formed displaying an increasing prominence of basal and suprabasal cells that, sliding onto the whole explant, showed the tendency to underlay stromal tissue and infiltrate into the underlaying sponge. After 21 days, sponge and fragments were incubated with trypsin-EDTA and dispersed epithelial cells were pipetted on a feeder monolayer of mitomycin-c-treated murine NIH.3T3 fibroblasts. Colonies of undifferentiated epithelial cells (p63, CK-19 and Ki-67 positive, CK-3 negative) were obtained: their cells, if seeded onto a collagen matrix containing embedded primary human corneal fibroblasts as feeder, provided the basic building blocks for reconstructing in vitro a 3D-multilayered corneal epithelium
Mitologie nazionali e scritture patriottiche dei Paesi Bassi
No full textProminent among the outcomes of humanistic thought and geographical discoveries, Europe experienced a renewed interest in the Past. This demand took place through the recovery of local antiquities, which turned into a full-fledged ideological appropriation that proved to be auxiliary to the process of building political bodies – as the works of Biondo Flavio, Conrad Celtis, Heinrich Bebel, Justus Lipsius, the Magnus brothers, William Camden, and Richard R. Verstegan, to name but a few, exemplify. The recovery and mythical re-creation of a glorious past, at the origin of a people, a lineage, or a dynasty, represent recurring themes in many cultures and are linked to processes of establishing a ‘national’ identity rooted in times and places that are often extraordinary or otherwise unexpected. North of the Alps, this trend was matched by the turning point of the Reformation and the sensational discovery of a supposedly lost 9th-century codex containing a copy of Tacitus’s Germania. In this mood of rediscovery of the Germanic antiquitates, underpinned by the theme of the origo gentis, this short text helped to fuel a vast array of works focusing on the exaltation of local cultures and values, giving rise to growing anti-classical/-Catholic feelings. In the Netherlands, an area formerly linked to intermittent settlement phenomena, the issue took on the relevance of an inventio; this was mainly due to the absence of an established local tradition among those groupings that historically gave rise to unequal political and cultural experiences, as is reflected in the related medieval and early modern literary heritage
- …
