171,246 research outputs found
CAJA 26 - LEGAJO II - SIGNATURA 9
No full textMemoriales de Carlos Folch, maestro herrero, presentando una hoja de sable y otra de cuchillo fabricandos por él mismo, pdiendo la protección de la Sociedad para establecer una fábrica en Valencia y pidiendo algún premio.Folch, C. (1796). Memoriales de Carlos Folch, maestro herrero, presentando una hoja de sable y otra de cuchillo fabricandos por él mismo, pdiendo la protección de la Sociedad para establecer una fábrica en Valencia y pidiendo algún premio. Real Sociedad Económica de Amigos del País de Valencia. https://riunet.upv.es/handle/10251/19327Importación Masiv
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
GIS-based tool to support civil aviation management during explosive volcanic eruptions
No full textWe present a software tool (yet under development) for short and long-term civil aviation management
in case of explosive volcanic eruptions. The tool covers the needs of stakeholders involved
in civil aviation management and interested in taking decisions based on a range of possible tephra
dispersal scenarios and/or ash dispersal forecasts. The GIS-based tool allows to display hazard and
vulnerability information, overlap maps to and estimate expected impacts (airports disrupted, routes
cancelled, etc.). We present the structure of the tool underlining the scientific background and
technical aspects of each element.
Hazard and vulnerability data are stored in a spatial database specifically designed to store deterministic
and probabilistic data sources. The database has a central role for the risk management process,
acting as a repository of maps to be used by the stakeholders for different purposes. To our knowledge,
this is the first “ad hoc” database proposed to store information about tephra dispersal hazard
and vulnerability.
The tool allows to overlap hazard and vulnerability data and estimate expected impacts through
spatially-based rules. Vulnerability and impact assessments are implemented by means of plug-ins
embedded in the GIS friendly interface. The analysis has been automated for the European air traffic
management during explosive eruptions. Results are relevant for the long-term risk assessment in
the European area. Regarding short-term, we present an example of application during an explosive
eruption at an active Icelandic volcano.
This GIS-based tool improves civil aviation management by automating short and long-term analyses
and making them faster and repeatable. Although this is only a prototype and still needs further
development, the up-to-date work can be a relevant contribution to the scientific community
Mitomycin C in highly myopic eyes - Author reply
No full textOphthalmology. 2005 Feb;112(2):208-18; discussion 219.
Mitomycin C modulation of corneal wound healing after photorefractive keratectomy in highly myopic eyes.
Gambato C, Ghirlando A, Moretto E, Busato F, Midena E.
SourceRefractive Surgery Service and Antimetabolite Therapy Research Unit, Department of Ophthalmology, University of Padova, Padova, Italy.
Abstract
PURPOSE: To evaluate the role of topical mitomycin C in corneal wound healing (CWH) after photorefractive keratectomy (PRK) in highly myopic eyes.
DESIGN: Prospective, double-masked, randomized clinical trial.
PARTICIPANTS: Seventy-two eyes of 36 patients affected by high (>7 diopters) myopia.
METHODS: In each patient, one eye was randomly assigned to PRK with intraoperative topical 0.02% mitomycin C application, and the fellow eye was treated with a placebo. Postoperatively, mitomycin C-treated eyes received artificial tears (3 times daily, tapered in 3 months), whereas the fellow eye was treated with fluorometholone sodium 2% and artificial tears (3 times daily, tapered in 3 months).
MAIN OUTCOME MEASURES: Uncorrected visual acuity (UCVA) and best-corrected visual acuity (BCVA), contrast sensitivity, manifest refraction, and biomicroscopy. Contrast sensitivity was determined using the Pelli-Robson chart. Corneal confocal microscopy documented CWH.
RESULTS: Mean follow-up was 18 months (range, 12-36). No side effects or toxic effects were documented. At 12-month follow-up examination, UCVAs (logarithm of the minimum angle of resolution) were 0.4+/-0.48 and 0.5+/-0.53 (P = .03) in mitomycin C-treated eyes and corticosteroid-treated eyes, respectively. At 1 year, corneal haze developed in 20% of corticosteroid-treated eyes, versus 0% of mitomycin C-treated eyes. At 12, 24, and 36 months, corneal confocal microscopy showed activated keratocytes and extracellular matrix significantly more evident in untreated eyes (Ps = 0.004, 0.024, and 0.046, respectively).
CONCLUSION: Topical intraoperative application of 0.02% mitomycin C can reduce haze formation in highly myopic eyes undergoing PRK.
Comment in
Ophthalmology. 2006 Feb;113(2):357; author reply 357-8
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
A GIS-based tool for the estimation of impacts of volcanic ash dispersal on European air traffic
No full textImpacts of volcanic ash on air traffic have been reconsidered in the aftermath of the 2010 eruption of Eyjafjallajokull volcano (Iceland), which caused great impacts to the European air traffic network. We present a GIS-based methodology to estimate the impacts of tephra dispersal from explosive volcanic eruptions aimed at improving air traffic management
in case of ash-contaminated airspace. We use the 2010 Eyjafjallajokull eruption as a case study with two main objectives: to introduce the methodology and to perform a posteriori analysis of the 2010 aviation breakdown. Modelling results of atmospheric tephra dispersal over Europe build upon a reanalysis dataset of meteorological and volcanological parameters. Given that there is still no consensus on thresholds of ash concentration that is critical for flight safety, the methodology takes into account several ash concentration values. Results are hourly tables and
maps containing information on potentially affected airports and routes at different Flight Levels (FLs). This allows estimating impacts at a high temporal frequency. We also compute dailyaccumulated impacts for each FL. We compare our results with the 2010 impacts. Furthermore, advantages and disadvantages of this methodology are discussed and compared with similar existing tools. Finally, we underline possible improvements of the methodology and describe further work
Hazard assessment of far-range volcanic ash dispersal from a violent Strombolian eruption at Somma-Vesuvius volcano, Naples, Italy: Implications on civil aviation
No full textLong-range dispersal of volcanic ash can disrupt civil aviation over large areas, as occurred during the 2010 eruption of Eyjafjallajökull volcano in Iceland. Here we assess the hazard for civil aviation posed by volcanic ash from a potential violent Strombolian eruption of Somma-Vesuvius, the most likely scenario if eruptive activity resumed at this volcano. A Somma-Vesuvius eruption is of concern for two main reasons: (1) there is a high probability (38 %) that the eruption will be violent Strombolian, as this activity has been common in the most recent period of activity (between AD 1631 and 1944); and (2) violent Strombolian eruptions typically last longer than higher-magnitude events (from 3 to 7 days for the climactic phases) and, consequently, are likely to cause prolonged air traffic disruption (even at large distances if a substantial amount of fine ash is produced such as is typical during Vesuvius eruptions). We compute probabilistic hazard maps for airborne ash concentration at relevant flight levels using the FALL3D ash dispersal model and a statistically representative set of meteorological conditions. Probabilistic hazard maps are computed for two different ash concentration thresholds, 2 and 0. 2 mg/m 3, which correspond, respectively, to the no-fly and enhanced procedure conditions defined in Europe during the Eyjafjallajökull eruption. The seasonal influence of ash dispersal is also analysed by computing seasonal maps. We define the persistence of ash in the atmosphere as the time that a concentration threshold is exceeded divided by the total duration of the eruption (here the eruption phase producing a sustained eruption column). The maps of averaged persistence give additional information on the expected duration of the conditions leading to flight disruption at a given location. We assess the impact that a violent Strombolian eruption would have on the main airports and aerial corridors of the Central Mediterranean area, and this assessment can help those who devise procedures to minimise the impact of these long-lasting low-intensity volcanic events on civil aviation. © 2012 Springer-Verlag
Density‐driven transport in the umbrella region of volcanic clouds: Implications for tephra dispersion models
No full textLarge explosive volcanic eruptions can generate ash
clouds from rising plumes that spread in the atmosphere
around a Neutral Buoyancy Level (NBL). These ash clouds
spread as inertial intrusions and are advected by atmospheric
winds. For low mass flow rates, tephra transport is mainly
dictated by wind advection, because ash cloud spreading due
to gravity current effects is negligible (passive transport).
For large mass flow rates, gravity-driven transport at the
NBL can be the dominant transport mechanism. Conditions
under which the passive transport assumption is valid have
not yet been critically studied. We analyze the conditions
when gravity-driven transport is dominant in terms of
the cloud Richardson number. Moreover, we couple an
analytical model that describes cloud spreading as a gravity
current with an advection-diffusion model. This coupled
model is used to simulate the evolution of the volcanic
cloud during the climatic phase of the 1991 Pinatubo
eruption. Citation: Costa, A., A. Folch, and G. Macedonio (2013),
Density-driven transport in the umbrella region of volcanic clouds:
Implications for tephra dispersion models.This work has benefited from funding provided
by the Italian Presidenza del Consiglio dei Ministri - Dipartimento
della Protezione Civile (DPC), agreement INGV-DPC 2012-2013. This
paper does not necessarily represent DPC official opinion and policies.
A.F. acknowledges funding by the Spanish project ATMOST (CGL2009-10244).Published4823–48273V. Dinamiche e scenari eruttiviJCR Journalrestricte
A Multi-Language Comparison of Influences on Author Verification using Character N-Grams
No full textWe create a new multi-language corpus for author verification based on Wikipedia talkpages, and evaluate the influence that differences in topic and time have on character n-gram author profiles. Topic alignment between two texts is found to increase author verification precision, and an authors writing style is found to change over time, but not more significantly after 3 years than after 1 year.Information ArchitectureWISElectrical Engineering, Mathematics and Computer Scienc
A 0.12mm<sup>2</sup> Wien-Bridge Temperature Sensor with 0.1°C (3σ) Inaccuracy from -40°C to 180°C
No full text Resistor-based temperature sensors can achieve much higher resolution and energy efficiency than conventional BJT-based sensors [1], but they typically occupy more area (> 0.25 mm 2 ) and have lower operating temperatures (le 125 {circ} {C}) [2]-[4]. This work describes a 0.12mm 2 resistor-based sensor that uses a Wien-bridge (WB) filter to achieve 0.1 {circ} {C} (3 sigma) inaccuracy from - 40 {circ} {C} to 180 {circ} {C}. Compared to a state-of-the-art WB sensor [4], it occupies 6 × less area and achieves comparable relative accuracy over a 76% wider operating range. Session 10.3 Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic InstrumentationMicroelectronic
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