1,607 research outputs found
Bruno Pontecorvo selected scientific works: recollections on Bruno Pontecorvo
No full textTo celebrate the 100th anniversary of the birth of Bruno Pontecorvo, the Italian Physical Society (Società Italiana di Fisica, SIF) in Italy and the Joint Institute for Nuclear Research (JINR, Dubna) in Russia have decided to publish a new expanded edition of the volume "B. Pontecorvo Selected Scientific Works - Recollections on B. Pontecorvo" (Società Italiana di Fisica, Bologna, 1997)
A proposito di Bruno
No full textÈ qui riprodotta la tavola rotonda tenutasi in occasione del convegno storico-scientifico dal titolo "Ricordando Pontecorvo" che si è svolto a Pisa il 26-27 gennaio 2004. Alla tavola rotonda, introdotta e coordinata da Giulio Peruzzi, hanno partecipato diversi testimoni dell'avventura scientifica e umana del grande fisico italiano. La versione a stampa è stata curata e rivista da Giulio Peruzzi
What have we learned about the transition phases to the syllabic and alphabetic systems?
No full textIn Spanish speaking children, as in Catalan, Portuguese and Italian speaking ones, most children arrive at the syllabic hypothesis with mainly a quantitative control over their written productions. They follow the hypothesis that, for writing words, you need to have at least four written letters; monosyllabic nouns cannot be written. Those last ones are rather rare in languages like Italian and Spanish ones, while they are very frequent in other writing systems like the English one.
At the very beginning all children try to differentiate qualitatively the writing of different words by using diverse variations in function of the letter repertoire available to them. They prefer not to use equal marks subsequently; for this reasons they avoid the use of double letters, both in Spanish and Italian language (Ferreiro, Pontecorvo & Zucchermaglio, 1987).
In order to produce an internal variation within the word, some of the children accept to produce order permutations. One of the first tool to introduce variations in writings is to permute the order of the letters available
To represent differences in children's writings children are asked to write diminutives like cane- cagnolino (Italian words for dog-doggie), singular-plural words like gatto-gatti (Italian words for cat-cats) and semantic similarities like gallo-gallina (Italian words for cock-hen.
A big step is when the child recognizes that the writing has to do with the sound value of the spoken word analyzed in a syllabic way.
Another important passage is to recognize the syllabic articulation of the words that are written and read in a syllabic way, distinguishing the phonemes C, SC and G in words like (e.g.) cavallo (Italian word for horse), pesce (Italian word for fish), coccinella (Italian word for labybird), pulcino (Italian word for chick), oca (Italian word for goose).
A particular status of children's productions is the writing of their proper noun which is often the main source of their letters repertoire.
Following this premise, my contribution will conclude on showing the transition to a syllabic way to reading-writing within a peer work of five preschool children in a 30 minutes interaction. I will also refer to more recent contributions (Ferreiro & Zamudio, 2008; Pontecorvo & Rossi, 2012) about how children can reach a syllabic-alphabetic way of reading-writing when they are submitted to three individual interview repeated by two months one another
Experimental results on Pontecorvo reactions with strangeness
No full textNew results concerning the detection of Pontecorvo reactions with strangeness (hidden or open) are presented. With a very selective 2-prongs dedicated trigger, we could show evidence of the p ¯ d→Φn reaction and an indication of the p ¯ d→Λ 0 K 0 reaction, reconstructed through the Λ 0 → pπ − decay
FIGURE 2. A. Flower, side view. B. Flower, upper view. C. Perigon with stamens. D. Bud. E. Anther. F. Ovary. G. Stigma. H. Fruit. I in Charybdis glaucophylla (Asparagaceae), a new species from Sardinia
No full textFIGURE 2. A. Flower, side view. B. Flower, upper view. C. Perigon with stamens. D. Bud. E. Anther. F. Ovary. G. Stigma. H. Fruit. I. Seed. Illustration by Salvatore Brullo based on Bacchetta & Pontecorvo s.n. (CAT).Published as part of Bacchetta, Gianluigi, Brullo, Salvatore, D'Emerico, Saverio, Pontecorvo, Cristiano & Salmeri, Cristina, 2012, Charybdis glaucophylla (Asparagaceae), a new species from Sardinia, pp. 16-26 in Phytotaxa 69 (1) on page 20, DOI: 10.11646/phytotaxa.69.1.4, http://zenodo.org/record/506619
RIAC 217Plus reliability prediction model in photovoltaic systems
No full textSystems reliability evaluation is an important task in industry. In fact, reliability indices suggest information about equipments quality level, maintenance and investments. Reliability performances can be estimated in different ways. Most used methods are reliability prediction models. In spite of their diffusion, their applications and results are often discussed, since each of them provides a different reliability evaluation for the same system under investigation. In addition, these models evaluates a system behaviour in a specific working condition. This aspect introduces supplementary problems in case of photovoltaic systems characterized by continuous changing operating conditions. The aim of this paper is to use the RIAC 217Plus model to a qualitative comparison between different Distributed Maximum Power Point Tracking converters to identify the most reliable one. A new index to characterize the reliability behaviour of systems used in continuous changing environmental conditions is proposed. © 2013 IEEE
“Metodi biotecnologici di identificazione microbica applicati nel controllo qualità dell’industria farmaceutica”
No full textThe role of environmental severe degradation in national asylum cases: jurisprudential wake-up calls for the asleep (EU) legislator ?
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