1,721,351 research outputs found
Reliable ground displacements from analogic recordings
No full textThe aim of this paper is to try to carry out, from analog records obtained in the acquisition of strong Italian earthquakes, a correct processing and interpretation of strong ground motions, with the goal of implementing, databases and databank. A methodology is proposed, to process reliable and important analog records in such a way to obtain physical displacements. © 2015, International Society for Structural Health Monitoring of Intelligent Infrastructure, ISHMII. All rights reserved
L’uso di applicazioni e risorse in rete nel lavoro degli insegnanti di scuola primaria - prima, durante e dopo la DaD
No full textNel febbraio del 2021 circa trecento insegnanti di scuola primaria appartenenti a due comunità professionali costituite come gruppi Facebook hanno risposto a un questionario somministrato attraverso la rete e hanno fornito informazioni riguardo la loro esperienza di insegnamento e i diversi usi della rete Internet nel loro lavoro prima, durante e dopo la chiusura delle scuole nella primavera del 2020. Il contributo studia in quale misura e in quale direzione si sono modificati, in particolare, gli usi funzionali all'attività didattica, collegando l’analisi dei dati con il panorama delle indagini che hanno colto il fenomeno durante la fase dell’emergenza. Fra i principali risultati, si evidenzia la diffusione e la permanenza dell’uso di applicazioni e risorse digitali precostituite, di sistemi per la gestione della didattica, di strumenti per produrre materiali didattici e, in minore misura, di spazi di lavoro online, tentando di mettere in luce le potenzialità e gli aspetti critici che essi hanno mostrato durante la DaD e quelli che possono presentare al di là dell’emergenza, in un contesto in cui prevale l’interazione diretta, cioè a scuola.In February 2021, about three hundred primary school teachers belonging to two professional communities set up as Facebook groups answered a questionnaire administered through the network, providing information about their teaching experiences and the different uses of the Internet in their work, before, during and after the closure of schools in spring 2020. The study examines to what extent and in what direction the use of the Internet for teaching has changed, linking the analysis of the data to the panorama of surveys that recorded the phenomenon during the emergency period. Key findings include the prevalence and durability of the use of ready-made digital applications and resources, learning management systems, tools for creating teaching materials and, to a lesser extent, online workspaces. An attempt is made to highlight the potential and critical aspects that they have shown during distance learning and that they can show beyond the emergency in a context where face-to-face interaction prevails, i.e. in school
Il benessere a scuola: sviluppo e risultati di un’inchiesta partecipativa
Full text linkIl contributo presenta i risultati di un’inchiesta tramite questionario sulle condizioni di benessere e disagio a scuola, che ha coinvolto 1389 studentesse e studenti di un Liceo di una città metropolitana dell’Italia settentrionale. Lo strumento d’indagine utilizzato è il prodotto di un processo partecipativo al quale hanno preso parte diverse componenti della comunità scolastica insieme ai ricercatori esterni. Il processo di costruzione ha preso le mosse da un precedente strumento elaborato da un gruppo di studentesse e studenti e ha tenuto conto sia di modelli disponibili nella letteratura di ricerca, sia dei risultati di una indagine esplorativa condotta mediante focus group. Le analisi fattoriali e di scala presentate in questo studio mostrano una struttura multidimensionale del costrutto di benessere che si adatta ai dati raccolti e risulta complessivamente coerente con alcuni studi recenti che ricadono nello stesso ambito. In particolare, il modello proposto considera dieci dimensioni del benessere a scuola, definite come adeguatezza e sicurezza degli spazi fisici, senso di protezione da comportamenti avversi emessi da insegnanti, o da altri studenti, informazione, espressione e partecipazione, rapporto con gli insegnanti, didattica, funzione formativa della valutazione, rapporto con i compagni, soddisfazione per la scelta dell'indirizzo e dell'Istituto. Infine, si presentano alcuni risultati dell’analisi delle differenze significative tra i gruppi secondo l’anno di scolarità, l’occorrenza di debiti formativi e l’identità di genere.This article presents the results of a questionnaire survey on the conditions of well-being and discomfort at school, in which 1389 students from a high school in a large northern Italian city took part. The survey instrument used is the result of a participatory process involving different components of the school community together with external researchers. The construction process started from a previous instrument developed by a group of students and took into account both models available in the research literature and the results of an exploratory study conducted through focus groups. The factor and scale analyses presented in this study show a multidimensional structure of the construct of well-being that fits the data collected and is broadly consistent with a number of recent studies in the same field. In particular, the proposed model considers ten dimensions of wellbeing in school, defined as the adequacy and safety of physical spaces, the feeling of protection from detrimental behaviour by teachers or other students, information, voice and participation, relationship with teachers, teaching methods, formative function of assessment, relationship with peers, and satisfaction with the choice of course and institution. Finally, some results of the analysis of significant differences between the groups according to school year, the occurrence of subject resits, and gender identity are presented
Fatty acids and alpha-tocopherol composition in hazelnut (Corylus avellana L.): A chemometric approach to emphasize the quality of European germplasm
No full textIn the frame of SAFENUT AGRI GEN RES Action, which was a European strategy for the recovery, characterization and conservation of genetic resources, the fatty acids and the tocopherol profiles of a set of 75 hazelnut accessions were analyzed. The aim of this study was to assess the genetic differences among the European germplasm, contributing to the definition of nut quality in traditional European areas of cultivation. Significant differences were found between accessions for oil amount and contents of most fatty acids. As expected, monounsaturated fatty acids made up the largest portion (mean 80.85 %) followed by polyunsaturated fatty acids (10.70 %). The saturated ones were the minor components and accounted for only 8.43 % of the total fatty acids. On the basis of Student's test, significant differences between the 2 years of harvest were found for fatty acid content, except for linoleic acid, the ratio of polyunsaturated, α-tocopherol and the stability index. When the oil content was studied in cultivars from the same site of cultivation, the mean values of the genetic pools from central Italy (60.8 %), Slovenia (59.3 %) and Portugal (58.2 %) showed highest values than those of cultivars grown in Greece (56.8 %), Spain (55.9 %) and France (51.5 %). A chemometric approach based on principal component and clustering analyses was developed to identify the most interesting cultivars for breeding programs. © 2013 Springer Science+Business Media Dordrecht
Trivariate Burr-III copula with applications to income data
Full text linkIn this work, Bivariate Burr-III copula is extended to the trivariate case. This copula seems to be very general and analytically manageable and it provides an alternative to the commonly employed elliptical copulas (such as the Gaussian or the Stutent's t ones) since they have, roughly, the same number of parameters. Several applications to income and wine data are described in the paper. They show that the Trivariate Burr-III copula is, in general, able to capture the dependence structure implicit in observed trivariate data. Moreover, they show that the third-order interaction parameter results, in some cases, significant at 1\% 1 % significance level while, in other cases, it can be removed from the fitted model. The ability of the Trivariate Burr-III copula in representing the dependence structure implicit in the considered data is compared with the ones of other well known copulas: the Clayton copula, the t copula, and the Skew-t copula. It results that the Trivariate Burr-III copula provides a good fitting and turns out to be the best performer in fitting the considered wine data but, on income data, the best performers are the t and Skew-t copulas. The over-performance of the last two copulas on income data is probably due to their ability in representing right-tail dependence (a kind of dependence that is not taken into account by the Trivariate Burr-III copula)
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
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