181,147 research outputs found
Supplemental Material - Does industry resilience matter for postshock industrial policy? A focus on tourism-related industries
No full textSupplemental Material for Does industry resilience matter for postshock industrial policy? A focus on tourism-related industries by Elena Prodi, Vincenzo Fasone and Marco R Di Tommaso in Tourism Economics</p
Measurements of newly defined intensimetric quantities and their physical interpretation
No full textThis paper deals with the measurement and physical interpretation of the quantities a and r introduced in a previous paper [D. Stanzial, N. Prodi, and G. Schiffrer. 'Reactive intensity for general fields and energy polarization,' J. Acoust. Sec. Am. 99, 1868-1876 (1996)]. The quantity a, which has the same time dependence as the squared acoustic pressure arid the same direction as the time averaged sound intensity , will be called here 'radiating' intensity, while r which has zero average, will be called 'oscillating' intensity. A coherent picture of the energy transfer process in steady sound fields based on the decomposition j = a+r of the instantaneous sound intensity will be sketched and discussed. Furthermore, a direct experimental comparison between a and r and the real and imaginary parts of the complex intensity is presented for some field conditions
A study of coupled volumes in opera houses during restorations
No full textIn an opera house the main hall and the stagehouse can be regarded as a typical example of acoustically coupled volumes. In this case the coupling is regulated by the proscenium opening. As a consequence the modifications in the stagehouse can have an significant impact on the hall. In particular an excess of reverberation is to be expected if the stage set is particularly acoustically light or, even worse, if the volume of the tower is increased for some reason. In this respect several technical and logistic requirements imply an increase of the stagehouse volume when theatres are refurbished. This seldom happens especially in the case of historical opera houses to optimize the change and storage of modern settings. In order to study the coupled the gathering of suitable experimental data for arranging a reliable calculation model requires special efforts. In the present work dedicated acoustical measurements are presented to qualify the impact on the hall of the modifications to be implemented in the stagehouse of an historical opera house, the Teatro "Zandonai" in Rovereto, Italy
Economia e istituzioni nella società di fine secolo
No full textIl paper getta luce sulle due grandi categorie di Istituzioni economiche: quelle per la promozione e la protezione dei cittadini (welfare state, sistema educativo); quelle atte a garantire il corretto funzionamento dei mercati (politica della concorrenza, regolamentazione dei mercati). L'analisi è svolta con particolare riferimento all'Italia, vista però in un quadro autenticamente europeo
Analysis of Pludix disdrometer performance during the BBC-2 campaign
No full textThe observed variability in the drop size distribution (DSD) or its integrated parameters is attributable to two main sources: instrumental effects and natural (spatial or temporal) variability. It is therefore important to compare different kinds of instruments in order to understand whether the DSD variability is due to nature or to differences among the instruments. The object of this work is to compare the performances of different disdrometers, which measure the DSD using different principles. In particular, it aims to test a recent device, called the Pludix. All the instruments analysed here are collocated: although in the past numerous DSD studies have used various types of disdrometers, only a few have compared the simultaneous DSD measurements by collocated disdrometers. The X-band rain-gauge disdrometer Pludix was employed over three months, from May 13 to August 13, 2003 in the BBC-2 (Baltex Bridge Cloud Campaign 2) at CESAR (Cabauw Experimental Site for Atmospheric Research) in The Netherlands, near Utrecht. The campaign was a large cloud measurement campaign, organized by the Royal Netherlands Meteorological Institute (KNMI), involving different kinds of instruments. One of the aims of the ground precipitation analysis was to compare different kinds of disdrometers in order to measure and parameterise the rainfall microstructure. Also used in the experiment were a two-dimensional video disdrometer (2DVD), two optical (infrared) disdrometers and different tipping-bucket rain-gauges (TB-RG). For the first time, Pludix was used alongside optical disdrometers. The aim of the present study is to compare the performances of these instruments, based on different measuring principles in the rainfall-rate (R) and DSD estimates. Moreover, several events are analysed at the Ferrara (Italy) site (Dept. of Physics-University of Ferrara), where the Pludix has been collocated since November 2001 alongside a Joss-Waldvogel impact disdrometer. Many more samples of simultaneous Pludix and JW measurements than in previous studies were collected, in order to provide a more robust DSD parameterization and to study the instrument dependency on the relationships between R integral parameters and precipitation types for different R regimes
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
PSYNDEX Tests Review für ProDi-L - Prozessbezogene Diagnostik von Lesefähigkeiten im Grundschulalter
No full textThis is a PSYNDEX Tests Review of ProDi-L - Prozessbezogene Diagnostik von Lesefähigkeiten im Grundschulalter. PSYNDEX Tests Reviews are written in German and describe and evaluate psychological and educational tests used in the German-speaking countries. PSYNDEX Tests is offered by the Leibniz Institute for Psychology as open access documentation.Das ist ein PSYNDEX Tests Review zu ProDi-L - Prozessbezogene Diagnostik von Lesefähigkeiten im Grundschulalter. PSYNDEX Tests Reviews beschreiben und bewerten zentrale psychologische und pädagogische Testverfahren, die in den deutschsprachigen Ländern eingesetzt werden, nach einem standardisierten Raster. PSYNDEX Tests wird durch das Leibniz-Institut für Psychologie als Open Access Dokumentation angeboten.Diagnostische Zielsetzung: Der ProDi-L basiert auf einem prozessorientierten Ansatz, womit sechs zentrale kognitive Teilprozesse von Grundschülern beim Leseverstehen differenziert erfasst und individuelle Fördermaßnahmen umgesetzt werden können. Er wird in der Individualdiagnostik, aber auch in der anwendungsorientierten Forschung, im Bereich der Schuleignungs-, Lernverlaufs- und Förderdiagnostik eingesetzt. Aufbau: Jeder Teilprozess wird durch einen Untertest abgefragt, daher besteht der ProDi-L aus sechs computergestützten Untertests: (1) Phonologische Rekodierung: Phonologische Vergleichsaufgabe. Stimmen visuelles und auditives Pseudowort überein? (2) Orthographischer Vergleich: Lexikalische Entscheidungsaufgabe. Stellt die gezeigte Buchstabenfolge ein Wort dar? (3) Zugriff auf Wortbedeutungen: Semantische Klassifikationsaufgabe. Ist das visuelle Testwort ein Unterbegriff des auditiven Kategoriennamens? (4) Syntaktische Integration: Urteile über die syntaktische Wohlgeformtheit. Ist der dargebotene Satz grammatikalisch korrekt? (5) Semantische Integration: Satzverifikationsaufgabe. Ist der dargebotene Satz inhaltlich korrekt? (6) Lokale Kohärenzbildung: Verifikationsaufgabe. Passen die zwei gezeigten Sätze zusammen? Grundlagen und Konstruktion: Studien konnten zeigen, dass sich Unterschiede in der Lesekompetenz früh ausbilden und sich sodann eher vergrößern. Daher sollten leseschwache Schüler/-innen möglichst früh identifiziert werden, um sie gezielt zu fördern. Mit dem ProDi-L sollte ein computergestütztes Diagnostikum erarbeitet werden, das Antwortrichtigkeit und Reaktionszeit kombiniert erfasst und damit Indikatoren für die Zuverlässigkeit und Effizienz einzelner Teilprozesse des Leseverstehens bei Grundschulkindern zu liefern imstande ist. Aufgrund der verwendeten statistischen Verfahren kann von der Klassischen Testtheorie ausgegangen werden. Die Untertests fragen verschiedene Lesefähigkeiten ab. Durch konfirmatorische Faktorenanalysen konnte bestätigt werden, dass es sich um klar trennbare, aber zusammenhängende Faktoren handelt. Innerhalb der Untertests wurden Testitems mit unterschiedlicher Schwierigkeit generiert. Empirische Prüfung und Gütekriterien: Reliabilität: Die Testwerte der Langform, die auf Reaktionszeiten basieren, weisen Reliabilitäten von Cronbachs Alpha > .90 auf. Die Reliabilitäten der integrierten Testwerte der Langform betragen alle Cronbachs Alpha > .80 bis auf den Untertest (4) Syntaktische Integration. Es fehlen Angaben zur Profilreliabilität. Validität: Die Konstruktvalidität kann als bestätigt betrachtet werden. Konfirmatorische Faktorenanalysen zeigen, dass die Teilprozesse psychometrisch differenzierbar, aber trotzdem miteinander verknüpft sind. Zudem variieren die Schwierigkeit und der Zeitbedarf parallel zum schwierigkeitsgenerierenden Merkmal. Die Zusammenhänge der Testwerte von ProDi-L mit kriterialen Lesefähigkeitsmaßen (gemessen mit ELFE 1-6; ELFE/Integrierter Testwert: r = .44-.67; ELFE/Reaktionszeit: r = .29-.56), Lehrerurteilen und sprachfreien Intelligenzmaßen sprechen für die konvergente sowie diskriminante Validität. Unterschiede in den Testwerten zwischen aufeinanderfolgenden Klassenstufen belegen die Kriteriumsvalidität. Zudem liegen erste Befunde vor, die für die prognostische Validität sprechen, da sich das Leseverständnis am Ende der dritten Klasse durch die Akkuratheit der phonologischen Rekodierung und des orthographischen Vergleichs am Ende der ersten Klasse vorhersagen lässt. Normen: Die Normstichprobe umfasst N = 1 418 Kinder (49 % Jungen; 48 % Mädchen; 3 % ohne Angabe) aus 103 verschiedenen Schulen aus den Großräumen Köln, Kassel und Frankfurt am Main.publishedVersio
Comparison between Pludix and impact/optical disdrometers during rainfall measurement campaigns
No full textThe performances of two couples of disdrometers based on different measuring principles are compared: a classical Joss¿Waldvogel disdrometer and a recently developed device, called the Pludix tested in Ferrara, Italy, and Pludix and the two-dimensional video disdrometer (2DVD) tested in Cabauw, The Netherlands. First, the measuring principles of the different instruments are presented and compared. Secondly, the performances of the two pairs of disdrometers are analysed by comparing their rain amounts with nearby tipping bucket rain gauges and the inferred drop size distributions. The most important rainfall integral parameters (e.g. rain rate and radar reflectivity) and drop size distribution parameters are also analysed and compared. The data set for Ferrara comprises 13 rainfall events, with a total of 20 mm of rainfall and a maximum rain rate of 4 mm h¿ 1. The data set for Cabauw consists of 9 events, with 25¿50 mm of rainfall and a maximum rain rate of 20¿40 mm h¿ 1. The Pludix tends to underestimate slightly the bulk rainfall variables in less intense events, whereas it tends to overestimate with respect to the other instruments in heavier events. The correspondence of the inferred drop size distributions with those measured by the other disdrometers is reasonable, particularly with the Joss¿Waldvogel disdrometer. Considering that the Pludix is still in a calibration and testing phase, the reported results are encouraging. A new signal inversion algorithm, which will allow the detection of rain drops throughout the entire diameter interval between 0.3 and 7.0 mm, is under development
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