1,355,977 research outputs found
On Grothendieck counterexample to the Generalized Hodge Conjecture
No full textFor a smooth complex projective variety X, let N^p the subspace of the cohomology space H^i(X, Q) of the classes supported by an algebraic subvariety of codimension at least p. Grothendieck showed that a conjectural description of this space given by Hodge is false, by an explicit example. Recently the point of view of Hodge was somewhat refined (Portelli, 2014), and we aimed to use
this refinement to revisit Grothendieck’s example. We explicitly compute the classes in this second space which are not in N^1H^3(X, Q). We also get a complete clarification that the representation of the homology customarily used for complex tori does not allow to apply the methods of (Portelli, 2014) to give a different proof that N^1H^3(X, Q) is different from the space conjectured by Hodge
What Makes Oral History Different
No full textA text from the age of great debates on the scientific status of research based on material considered by many historians to be of questionable value. In his paper, Alessandro Portelli deals with the doubts and accusations made not only then, but also today, wherever “the phantom of spoken history” shows up. This manifesto of sorts has great educational value, since it organises and explains the issues of epistemological and technical nature fundamental for oral history, including the reliability of oral sources, the consequences of their oral nature and the role of transcription, and finally, the objectivity of the message.
Reprint: A. Portelli, The Death of Luigi Trastulli and Other Stories: Form and Meaning in Oral History, State University of New York Press, Albany 1991, s. 45–58 State University of New York Press, Albany, 1991, p. 45–58, courtesy of State University of New York Press. The first version – “Sulla specificitá della storia orale” was published in Primo Maggio (Milan, Italy), 1979, vol. 13, p. 54–60, later reprinted as “The peculiarities of oral history” in History Workshop, 1981, no. 12, p. 96–107. [Translation based on: A. Portelli, “What makes oral history different”, [in:] The Oral History Reader, A. Thompson, R. Perks (eds.), London, New York 1998, p. 63–74. The permission to publish the translated version of the article has been granted by the author. License: CC BY-SA 4.0. (editor’s note)
Primary enamel permeability: a SEM evaluation in vivo.
No full textAIM:
The aim of this study was to evaluate in vivo the occurrence of outward fluid flow on primary tooth sound enamel surface.
MATERIALS AND METHODS:
Sixty primary upper canines from preadolescent patients (mean age 8.0±1.9) and 24 retained primary upper canines from adult subjects (mean age 35.0±1.8) were analysed. The enamel surface was gently polished and air dried for 10 s. An impression was immediately obtained by vinyl polyxiloxane. Replicas were then obtained by polyether impression material, gold coated and inspected under SEM. The hydrophobic vinyl polyxiloxane material enabled to obtain in situ a morphological image of the presence of droplets, most likely resulting from outward fluids flow through outer enamel. For each sample three different representative areas of 5μ2 in the cervical, medium and incisal third were examined and droplets presence values was recorded. All data were analysed by by Fisher's exact test.
RESULTS:
Primary enamel showed a substantial permeability expressed as droplets discharge on its surface. Droplets distribution covered, without any specific localisation, the entire enamel surface in all the samples. No signs of post-eruptive maturation with changes in droplets distribution were observed in samples from adult subjects. No statistically significant differences (P = 0.955) were noted in the percentage distribution of enamel area covered with droplets among the two group studied.
CONCLUSION:
SEM evaluation of droplets distribution on enamel surface indicated a substantial enamel permeability in primary teeth, accordingly with histological features, without changes during aging. A relationship between enamel permeability, caries susceptibility and bonding procedures effectiveness could be hypothesised
Autobiography, Plural Authorship and the Death of the Author”, Germinal (Delhi, India), special issue Autobiography – Fact and Fiction, 5, 2008-2009, 12-24
No full textOriginariamente pubblicato come n. 5 della rivista "Germinal" del dipartimento di Germanic and Romance Languages dell'università di Delh
La historia oral es un arte de la escucha. Entrevista a Alessandro Portelli / Oral History is a listening art. Interview to Alessandro Portelli
No full textInterview with Alessandro Portelli, great Historian of Memory and one of the great activists of Oral History. Aware that the memory is not a mere mirror of what happened, but a process that may be thought, the works of Portelli have put the emphasis on an analysis of the memory as a narrative configurator of the event, beyond its factuality.Keywords: Oral History, Memory, memories, Portelli
Come gather 'round friends... Àcoma per Bruno Cartosio e Alessandro Portelli
No full textThe volume is a collection of essays indebted with the work of two Italian Americanists, Bruno Cartosio and Alessandro Portelli. The essays treat the relationship between literature and history, poetry and music, religion and politics, environmental questions, war and peace issues
Générations à Gênes, juillet 2001
No full text« Générations à Gênes » est un article d’Alessandro Portelli, inédit en français et traduit par Laura Brignon. Écrit par A. Portelli en 2005 à partir d’entretiens d’histoire orale, il revient sur les journées du G8 de Gênes en croisant les témoignages des jeunes, qui parfois manifestaient pour la première fois, et de leurs parents, oscillant entre fierté, peur et colère. La mort de Carlo Giuliani y joue un rôle particulièrement central, à la fois d’un point de vue chronologique, politique et psychologique, dans la mesure où les relations parents-enfants y trouvent un point d’identification majeur. Tissant les déplacements, les récits et les émotions jusqu’à l’après-Gênes, Portelli montre aussi comment cet événement, tout comme 68, est susceptible d’inverser le sens de la tradition politique.Generazioni a Genova è un articolo di Alessandro Portelli, inedito in francese e qui tradotto da Laura Brignon. Scritto da A. Portelli nel 2005 sulla base di testimonianze dell'epoca, ripercorre i giorni del G8 di Genova attraverso gli occhi dei giovani, alcuni dei quali manifestavano per la prima volta, e dei loro genitori, che oscillavano tra orgoglio, paura e rabbia. La morte di Carlo Giuliani vi ha un ruolo particolarmente centrale, dal punto di vista cronologico, politico e psicologico, in quanto la morte del ragazzo cristallizza questo rapporto genitori-figli. Intrecciando spostamenti dei protagonisti, storie ed emozioni fino al dopo-Genova, Portelli mostra anche come questo evento, come il '68, sia in grado di «capovolgere la tradizione».“Generations in Genoa” is an article by Alessandro Portelli, unpublished in French and translated by Laura Brignon. Written by A. Portelli in 2005, based on oral narrative interviews from the time, it looks back at the days of the G8 in Genoa, cross-referencing first-hand accounts from young people, who were sometimes demonstrating for the first time, with those of their parents, swaying between pride, fear and anger. The death of Carlo Giuliani plays a particularly central role, from a chronological, political and psychological point of view, as a key point of identification in the parent-children relationships. By weaving together movements, narratives and emotions right up to the post-Genoa period, Portelli also shows how this event, like 68, is likely to reverse the direction of political tradition
“El uso de la entrevista en la historia oral”Escuela de Historia, Universidad Nacional de Rosario (Argentina), 2006, pp. 35-49.
No full textMark Twain, Alla persona che siede nelle tenebre. Scritti sull’imperialismo, cura e introduzione
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