1,721,077 research outputs found
Silica fibers production and characterization for future gravitational waves detectors
No full textThe observation of gravitational waves is highly in uenced by the detectors sensitivity, thatis limited at low frequencies (10 -100 Hz) by the thermal noise. For this reason, the monolithicsuspensions are one of the most important upgrades of the interferometric detectors includingAdvanced Ligo (aLigo) and Advanced Virgo (AdV). Currently the silica bers are built to minimizethe thermal noise in the band of interest and to t the load constraints. Nevertheless, the need tohave larger reference masses for the future updates of Virgo and also for the future 3G detectors atroom temperature, requires redesigning the bers, and all the facilities for their production, testingand characterization, for instance the bers for Advanced Virgo Plus (AdV+) will be 60% thicker todeal with a working load 2.5 times higher. We will describe the manufacturing system, the nominalcharacteristics and the mechanical measurements of AdV's silica bers, as well as the updates toimprove the production and characterization process for the new speci cations of AdV+. Finallyan approach to the study of fatigue for silica bers will be presented; the study of the behaviorof pristine bers is important to achieve a consistent model of lifetime prediction for maintenanceand security reasons
Stochastic modelling of PTEN regulation in brain tumors: a model for Glioblastoma Multiforme
Full text linkThis work is the outcome of the partnership between the mathema-
tical group of Department DISBEF and the biochemical group of Department
DISB of the University of Urbino Carlo Bo"in order to better understand
some crucial aspects of brain cancer oncogenesis. Throughout our collabora-
tion we discovered that biochemists are mainly attracted to the instantaneous
behaviour of the whole cell, while mathematicians are mostly interested in the
evolution along time of small and dierent parts of it. This collaboration has
thus been very challenging. Starting from [23, 24, 25], we introduce a compe-
titive stochastic model for post-transcriptional regulation of PTEN, including
interactions with the miRNA and concurrent genes. Our model also covers
protein formation and the backward mechanism going from the protein back
to the miRNA. The numerical simulations show that the model reproduces the
expected dynamics of normal glial cells. Moreover, the introduction of transla-
tional and transcriptional delays oers some interesting insights for the PTEN
low expression as observed in brain tumor cells
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
Reply to: Bile salt export pump expression: Can immunohistochemistry in isolation mislead?
No full textDispelling 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
Acute post-renal kidney graft dysfunction due to cytomegalovirus-positive nephrogenic adenoma-case report and review of the literature.
Full text linkTissue-invasive cytomegalovirus (CMV) disease represents a well-recognized complication after kidney transplantation. However, direct involvement of the urogenital tract and CMV-ureteritis occur less frequently. Nephrogenic adenomas are benign lesions of the urinary tract preferentially reported in kidney transplant recipients. We herein report a second case of a 33-year-old male kidney transplant recipient with acute post-renal allograft dysfunction due to CMV-positive ureteral nephrogenic adenoma. A causal connection might be suspected but remains to be proven
- …
