85 research outputs found
Biancaneve a Marrakesh
No full text In ambito glottodidattico Glottodrama e Process Drama sono solo due delle molteplici declinazioni in cui trovano spazio tecniche e metodi teatrali. Come in ogni approccio l’insegnante deve saper creare di volta in volta la commistione giusta dei vari strumenti per rispondere in modo adeguato e con successo alle specifiche esigenze apprenditive di gruppi di apprendenti differenti. Dopo un’introduzione teorica, l’autrice illustra un progetto innovativo di teatro e lingua seconda realizzato tra aprile e giugno 2012 nel comune di Gorla Maggiore (Va) con un gruppo di immigrate magrebine. Dalla lettura emerge come l’analisi dettagliata dei bisogni linguistici-comunicativi e la riflessione sociolinguistica e metacognitiva del gruppo delle apprendenti consenta l’integrazione di modelli e tecniche diverse per un approccio teatrale alla lingua italiana “su misura”. Snow White in Marrakesh In the field of language teaching Glottodrama and Process Drama are just two of the many ways in which theater techniques and methods are implemented. As with any approach, the teacher must be able to create the right mixture of various tools to respond appropriately and successfully to the specific needs of groups of different learners. After a theoretical introduction, the author describes an innovative theater and second language project carried out April and June 2012 in the municipality of Gorla Maggiore (Va) with a group of North African immigrants. There is a detailed analysis of the linguistic-communicative needs and sociolinguistic and metacognitive reflection by the group of learners whichallows for the integration of models and techniques for a theatrical approach to “tailored” Italian language teaching.</p
Degrees of Kalman varieties of tensors
No full textFunding Information: The idea of this project was conceived during Shahidi's postdoc at Università di Firenze. We thank Giorgio Ottaviani for very useful discussions and encouragement. We thank Jan Draisma for explaining to us a way of deriving the equations in Example 41 . The first author thanks Dr. Alireza Firoozfar and Dr. Mohsen Afsharchi for their support. The second author is partially supported by the Academy of Finland Grant 323416 . During most of the preparation of the manuscript, the third author was a postdoc at Universität Bern, supported by Vici Grant 639.033.514 of Jan Draisma from the Netherlands Organisation for Scientific Research . We thank two anonymous referees for their useful comments and questions that also helped to improve the presentation. Publisher Copyright: © 2022 The Author(s)Kalman varieties of tensors are algebraic varieties consisting of tensors whose singular vector k-tuples lay on prescribed subvarieties. They were first studied by Ottaviani and Sturmfels in the context of matrices. We extend recent results of Ottaviani and the first author to the partially symmetric setting. We describe a generating function whose coefficients are the degrees of these varieties and we analyze its asymptotics, providing analytic results à la Zeilberger and Pantone. We emphasize the special role of isotropic vectors in the spectral theory of tensors and describe the totally isotropic Kalman variety as a dual variety.Peer reviewe
Stanze sul tempo. Sei variazioni fra rovine, fossili e vulcani
No full textIl tema portante di questa monografia è la temporalità, esplorata come espressione dell'intreccio fra storia della natura e rovine della storia. L'autore descrive i modi in cui fra Sei e Settecento si è variamente configurata la reciproca influenza fra storia naturale, filologia e la nascente antiquaria. Riservando particolare attenzione al ruolo decisivo svolto dalla ricezione dei testi della classicità greca e latina, nel volume si seguono le alterne fasi del dibattito sia nei contesti scientifici che in quelli eruditi, per far emergere le affinità metodologiche fra storia naturale e storiografia.The main theme of this monograph is the temporality, explored as an expression of the interaction between natural history and ruins of history. The author describes ways in which between the 17th and 18th centuries it was variously configured mutual influence between natural history, philology and the fledgling antiquaria. Paying particular attention to the decisive role played by the reception of classical Greek and Latin texts in the book follow the alternate stages of debate both in scientific contexts as well as scholars, to bring out the methodological affinity between natural history and historiography
LARGE AMPLITUDE MOTIONS IN COUMARAN: A SPECTROSCOPIC AND THEORETICAL STUDY
No full textE. Bondoc, T. Klots, J. Laane, J. Phys. Chem A 104, 275 (2000)Author Institution: Dipartimento di Chimica ``G. Ciamician'', Universit\`{a} di BolognaThe structure of coumaran (2,3-dihydrobenzofuran) is characterized by a non-planar skeleton, due to the position of the most far apart carbon in the dihydrofuran ring. We have measured 133 a, b and c type lines of the rotational spectrum in the millimeter-wave region (59-78GHz), characterized by a doubling typical of an inversion motion such as the ring-puckering of the five-membered ring. By using a coupled Watson's Hamiltonian we found an energy splitting MHz; this value is quite in contrast with a previous far-infrared and Raman . In order to better interpret this large amplitude motion we performed also quantum chemical calculation and used Meyer's flexible model
Sudden Intrauterine Unexplained Death (SIUD) «Gray Zone» or borderline
No full textThe author reports the histopathological findings of 9 fetuses (3 females and 6 males, ranging in age from 34 to 41 gestational weeks) that died suddenly and unexpectedly in utero. They presented brainstem and cardiac conduction system lesions together with abnormalities of the fetal adnexa. A complete autopsy was performed, including detained investigation of the brainstem and cardiac conduction system on serial sections, as well as of the fetal adnexa, according to our guidelines. Histological examination of the fetal adnexa disclosed the presence of chorioamnionitis (7 cases), an abnormally short umbilical cord (1 case), and placental infection by parvovirus (1 case). These lesions were associated with brainstem lesions, i.e., hypoplasia of the arcuate nucleus (6 cases), inflammatory infiltrates in the brainstem (2 cases), hypoplasia of the raphe obscurus nucleus (2 cases), hypoplasia of the parabrachial Kölliker-Fuse complex (1 case), hypoplasia of the pre-Bötzinger complex (1 case), agenesis of the facial/parafacial complex (1 case), as well as conduction system lesions, i.e., dispersion or septation of the atrio-ventricular junction (9 cases), islands of the conduction system inside the central fibrous body (5 cases) resorptive degeneration (4 cases), cartilaginous meta-hyperplasia (2 cases), Mahaim fibers (1 case). Each SIUD victim presented at least one of these brainstem and/or cardiac conduction abnormalities, more than one change being present in the same fetus. The SIUD «gray zone», or borderline cases, are hereby described as those cases in which the lesions of the fetal adnexa alone might not have accounted for the sudden deaths, had it not been for the concomitant presence of brainstem and cardiac conduction lesions representing the morphological substrates for SIUD, as well as for SIDS. Our 9 cases are consistent with the triple-risk model, a hypothesis introduced for SIDS postulating an underlying biological vulnerability to exogenous stressors or triggering factors in a critical developmental period. In conclusion, we are convinced that there is a continuum between SIUD and SIDS and the triple-risk model is herein considered for the first time also for SIUD “gray zone” victims
Listeria monocytogenes
No full textThis chapter is dedied to Listeria monocytogens, one of the most important foodborne pathogens which can grow in foods for human consumption.
It contains all aspects of the microbial ecology of Listeria, data on the pathogenis of human listeriosis as well as informations about the most recent diagnostic procedures to isolate and also to count the number of the bacterium in foods. Finally, the author discuss the aspects of European legal rules on the presence of Listeria monocytogenes in foods for human consuption
Superior compatibility of silicon nanowire anodes in ionic liquid electrolytes
No full textSilicon nanowire anodes were investigated in lithium-metal cells using different electrolyte formulations based on 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMITFSI), 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (EMIFSI) and N-trimethyl-N-butyl-ammonium bis(fluoro sulfonyl)imide (N1114FSI) ionic liquids. The lithium insertion process in the silicon anode was analyzed by cyclic voltammetry measurements, performed at different scan rates and for prolonged cycles, combined with impedance spectroscopy analysis. A galvanostatic charge-discharge cycling test was performed to analyze the electrochemical performances using different types of ionic liquids. A study of the SEI (Solid Electrochemical Interface) layer on the silicon nanowire electrode surface was carried out through X-ray photoelectron spectroscopy (XPS). In general, the silicon anodes in EMIFSI-based electrolytes show very good reversibility, reproducibility, and efficiency in the lithiation process even at high scan rates and exhibits a reversible capacity exceeding 1000 mA h g-1 after 2000 charge-discharge cycles, corresponding to 46 % of the initial value
A footnote to a footnote to a paper of B. Segre
No full textThe paper is devoted to a detailed study of sextics in three variables having a decomposition as a sum of nine powers of linear forms. This is indeed the unique case of a Veronese image X of the plane which, in the terminology introduced by Ciliberto and the first author, is {\it weakly defective}, and non-identifiable: a general sextic of the 9-secant variety of X has two minimal decompositions
Asymptotics of degrees and ED degrees of Segre products
No full textFunding Information: We thank Jay Pantone for very useful conversations. We thank the referees for useful comments. The first two authors are members of INDAM-GNSAGA. The third author would like to thank The Department of Mathematics of Universit? di Firenze, where this project started in June 2018, for the warm hospitality and financial support. The first author is supported by the H2020-MSCA-ITN-2018 project POEMA. The second author is partially supported by the Academy of Finland Grant 323416. The third author is supported by Vici Grant 639.033.514 of Jan Draisma from the Netherlands Organisation for Scientific Research. Publisher Copyright: © 2021 The Author(s)Two fundamental invariants attached to a projective variety are its classical algebraic degree and its Euclidean Distance degree (ED degree). In this paper, we study the asymptotic behavior of these two degrees of some Segre products and their dual varieties. We analyze the asymptotics of degrees of (hypercubical) hyperdeterminants, the dual hypersurfaces to Segre varieties. We offer an alternative viewpoint on the stabilization of the ED degree of some Segre varieties. Although this phenomenon was incidentally known from Friedland-Ottaviani's formula expressing the number of singular vector tuples of a general tensor, our approach provides a geometric explanation. Finally, we establish the stabilization of the degree of the dual variety of a Segre product X×Qn, where X is a projective variety and Qn⊂Pn+1 is a smooth quadric hypersurface.Peer reviewe
Community weighted mean trait data of Italian forest understories
No full textPlant functional trait data aggregated at the community level (i.e., community weighted mean, CWM) are fundamental to study plant-environment relationships. Here, we provide a large database of CWM values of twelve traits reflecting several plant functions, including leaf, seed, whole-plant, clonal and bud bank traits. The CWMs were calculated in 201 forest stands (a statistically representative sample of all the Italian forests) across three biogeographic regions: Alpine, Continental, and Mediterranean. © 2019 The Author(s
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