1,721,010 research outputs found
DALLA MATEMATICA... ALLA FISICA Richiami di Matematica e semplici esercizi di Fisica tra la Scuola Superiore e l'Università
No full textQuesto libretto a prima vista può apparire strano, o inutile: sembra infatti contenere nozioni elementari di Matematica e Fisica, non approfondite, anche un po’ slegate tra loro, e comunque già ampiamente trattate a livello di scuola superiore. Pertanto la domanda è: che bisogno c’è di un testo come questo?
Gli autori, docenti di Fisica rispettivamente a livello universitario (Lauree Triennali nelle Professioni Sanitarie) e secondario (Istituti Tecnici), e collaboratori in molte attività didattiche e di ricerca presso il Dipartimento di Fisica Nucleare e Teorica dell’Università di Pavia, hanno sperimentato “sul campo” che non è raro incontrare persone che desiderano specializzarsi in ambiti di tipo tecnico, ad es. in campo sanitario, ma che per vari motivi presentano – e conservano talvolta fino all’età adulta – drammatiche lacune di base in campo matematico-scientifico, tali da impedire loro qualsiasi possibilità di successo anche a livello professionale.
A beneficio di questi studenti ecco allora l’idea di un testo breve e agile, che si ponga “tra” la scuola superiore e l’Università, raccogliendo in sé alcuni argomenti di Matematica indispensabili per chi vuole intraprendere una professione tecnico-scientifica, e numerosi esempi ed esercizi svolti, attinti dai normali programmi di Fisica ma il piu’ possibile aderenti ai problemi pratici della vita e del lavoro.
Significativamente le due parti del testo sono chiamate “I mattoni...” (dalla Matematica alla Fisica) “...per costruire la casa” (le applicazioni fisiche): e’ un piccolo contributo a una diffusione, semplice e “popolare” ma non per questo meno importante e rigorosa, dell’utilizzo quotidiano di metodi e tecniche matematico-scientifiche nelle professioni “normali”, dove la Matematica e la Fisica mostrano il loro vero valore proprio “nascondendosi” nella vita reale
Background radioactivity in the scaler mode technique of the Argo-YBJ detector
No full textARGO-YBJ is an extensive air shower detector located at the Yangbajing Cosmic Ray Laboratory (4300 m a.s.l., 606 g cm-2 atmospheric depth, Tibet, China). It is made by a single layer of Resistive Plate Chambers (RPCs, total surface ∼6700 m2) grouped into 153 units called "clusters". The low energy threshold of the experiment is obtained using the "scaler operation mode", counting all the particles hitting the detector without reconstruction of the shower size and arrival direction. For each cluster the signals generated by these particles are put in coincidence in a narrow time window (150 ns) and read by four independent scaler channels, giving the counting rates of channel ≥1, ≥2, ≥3 and ≥4 hits. The study of these counting rates pointed out a different behavior of channel ≥1 respect to the higher multiplicity channels: while the MC simulations can account fairly well for the coincident counting rates, the expectation for channel ≥1 is sensibly less than the measured value. Moreover, the regression coefficient with the atmospheric pressure for channel ≥1 is also about half of the value measured for the coincident counting rates: seemingly half of these counts did not cross the atmosphere.Measurements of the natural radioactivity background in the air of the detector hall and a MC simulation to estimate its contribution on our counting rates are presented and discusse
Natural radioactivity effects on the scaler operation mode of the ARGO-YBJ detector
No full textARGO-YBJ is an extensive air shower
detector located at the Yangbajing Cosmic Ray
Laboratory (4300 m a.s.l., 606 g/cm2 atmospheric
depth). It is made by a single layer of Resistive
Plate Chambers (RPCs, total surface » 6700 m2)
grouped into 153 units called ”cluster”. The lower
energy threshold of the experiment is obtained using
the ”scaler operation mode”, i.e. counting all the
particles hitting the detector without measurement
of the energy and arrival direction of the primary
cosmic rays. For each cluster the signals generated
by these particles are put in coincidence in a narrow
time window (150 ns) and read by four independent
scaler channels, giving the counting rates of ̧ 1,
̧ 2, ̧ 3 and ̧ 4 hits. The study of these counting
rates has given unexpected results: while the MC
simulations can account fairly well for the coincident
counting rates, the expectation for channel ̧ 1
is about half of the measured value. Moreover as
discuss in [2], the regression coefficient with the
atmospheric pressure for channel ̧ 1 is also about
half of the value measured for the coincident counting
rates: seemingly half of these counts did not cross the
atmosphere. A measurement of the radioactivity of
the ground below the detector and a MC simulation
to estimate the contribution from this local effect on
our counting rates is presented and discusse
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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