1,720,999 research outputs found
Stress analysis and buckling stability of imperfect pressure vessel heads with geometric variations
Get PDFThis study provided a comprehensive analysis of geometry, imperfections, and material distribution affecting the structural performance of HDPE pressure vessels. The findings contribute valuable insights for designing more resilient and efficient pressure tanks, bridging the gap between theoretical models and practical engineering applications. This work emphasizes the importance of geometric optimization, advanced stress analysis, and targeted reinforcement in advancing the reliability of HDPE pressure tanks in real-world scenarios
Alterazioni elettrofisiologiche prodotte nel ratto dall'esposizione prenatale a monossido di carbonio
No full textComparative evaluation of the neuromuscular blocking activity of three new aminoglycoside antibiotics in rats.
No full textThe effects of three aminoglycoside antibiotics on the rat isolated phrenic nerve-diaphragm preparation and on the sciatic nerve-gastrocnemius muscle preparation were investigated. Tobramycin, amikacin and ribostamycin produced dose-dependent neuromuscular blockade of the diaphragm twitches. Comparison of results showed that the neuromuscular blocking potency was as follows: tobramycin greater than amikacin greater than ribostamycin. The neuromuscular blockade produced gy these antibiotics was reversed by calcium chloride, whereas it was not influenced by neostigmine methylsulfate. Furthermore, the neuromuscular blocking potency in vitro of these three aminoglycosides was paralleled by their activity in vivo on the sciatic nerve-gastrocnemius muscle preparation
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Changes in peripheral nervous system activity produced in rats by prenatal exposure to carbon monoxide
No full textCaratterizzazione della resistenza a ciclaggio termico di rivestimenti a base CoCrAlTaY su superlega di nichel
No full textTra i rivestimenti anticorrosivi innovativi per parti calde di turbine a gas, i più interessanti dal punto di vista economico sono i
CoNiCrAlY, depositati sia con tecnica HVOF (High Velocity Oxygen Fuel) che Laser Cladding.
Lo scopo principale di questo studio è valutare e confrontare il comportamento a shock termico di rivestimenti di CoNiCrAlY
con differente rinforzo (es: Al
2
O3
, zirconia-titania-yttria e TaC in forma e percentuali differenti), depositati per HVOF e Laser
Cladding su campioni di superlega di Nichel. La resistenza a shock termico è stata valutata effettuando una tempra in acqua
(25°C) dei campioni a partire da una temperatura di 1000°C.
Le superfici di rinforzo e la sezione trasversale dei campioni sono state analizzate mediante microscopia ottica (OM) ed
elettronica a scansione (SEM), prima e dopo il ciclaggio termico. Le proprietà meccaniche dei campioni sono state misurate
sulla sezione trasversale dei rivestimenti mediante prove di micro-durezza. Sulla base delle analisi realizzate la resistenza
a shock termico dei rivestimenti HVOF è risultata inferiore a quella dei rivestimenti Laser Cladding, i quali presentano però
valori di durezza nettamente più bassi. I cicli termici danno origine alla formazione di cricche e delaminazione/distacco del
rivestimento. In tutti i casi le cricche iniziali hanno origine dal bordo del campione
Effects of dibekacin, a new aminoglycoside antibiotic, on the rat sciatic nerve-gastrocnemius muscle preparation
No full textO-3-amino-3-deoxy-α -D-glucopyranosyl-(1→6)- O-[2,6-diamino-2,3,4,6-tetradeoxy -α-D-erythro-hexopyranohexopyranosyl- (1→4)]-2-deoxy-L-streptamine (dibekacin), like other known aminoglycoside antibiotics, possesses a dose-dependent neuromuscular blocking activity in vivo. d-Tubocurarine, at a dose which per se does not influence the contraction of gastrocnemius muscle elicited by sciatic nerve stimulation, significantly potentiates the neuromuscular blockade produced by dibekacin. Neostigmine methylsulfate is unable to reverse the neuromuscular blocking activity of dibekacin, whereas calcium chloride antagonizes the neuromuscular blockade produced by this antibiotic
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