1,720,975 research outputs found
Un’attività interdisciplinare tra geometria e botanicaper le classi della scuola primaria: piante allo specchio e caccia alla fillotassi
No full textQuesto lavoro presenta due laboratori del progetto Laboratori Itineranti STEM di Mathesis Bergamo da me condotti in alcune scuole primarie della provincia di Bergamo durante l’a. s. 2022-2023. Questo lavoro mi ha dato modo di avviare l’adattamento di alcune attività legate al kit “Simmetria: matematica in giardino” (http://specchi.mat.unimi.it/) destinato alla scuola secondaria di primo grado. Il kit fa parte delle proposte didattiche del Dipartimento di Matematica “F. Enriques”. I due laboratori, che vertono sui concetti di isometria nel piano e nello spazio, propongono attività di scoperta della matematica celata nelle piante.
Le due attività laboratoriali sono state proposte anche a studenti del corso di laurea in Scienze della Formazione Primaria dell’Università di Bergamo.This work presents two laboratories of the STEM Itinerant Laboratories project of Mathesis Bergamo which I conducted in some primary schools in the province of Bergamo during the academic year 2022-2023. This work gave me the opportunity to start the adaptation of some activities related to the kit "Symmetry: mathematics in the garden" (http://specchi.mat.unimi.it/) intended for lower secondary school. The kit is part of the teaching proposals of the Department of Mathematics “F. Enriques”. The two laboratories, which focus on the concepts of isometry in the plane and in space, offer activities for the discovery of the mathematics hidden in plants.
The two laboratory activities have also been proposed to students of the degree course in Primary Education of the University of Bergamo
Phyllotaxis tool : A didactical tool for practical laboratory
No full textOur poster presents a practical tool we have developed, which shows the divergence angle between two consecutive leaves on a plant stem.
We used this tool in practical laboratory, with the purpose to explain "how much" and "what" mathematics is hidden in plants. We employed the sunflower plant as the subject for this educational activity. To make the term “divergence angle” understandable to everyone, we have reproduced a simple model of the arrangement of sunflower’s leaves. The leaves on the stem grow one per node, each at a constant divergence angle of 144 degrees from the previous, and they arrange with an evident spiral phyllotaxis.
This tool allows to visualize and to evaluate the divergence angle. We obtain this angle through the reflection of the helix that wraps on the stem on the basal plane of the tool. At the end of the laboratory, participants can design the angle and measure it.
The educational activity has been developed for students of primary school and for first class of secondary schools. We have also tried the event with generic public, from the age of nine up.
This homemade object is low-cost and easy to realize. Idea and design developed in collaboration with Museo Civico Explorazione Treviglio (BG)
Indagini fitosociologiche in aree poco note: la vegetazione del Parco del Rio Vallone (MI-MB-LC)
No full text
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
Dispelling 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
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