Search results for "fission"
showing 10 items of 421 documents
A new vicious cycle involving glutamate excitotoxicity, oxidative stress and mitochondrial dynamics
2011
Glutamate excitotoxicity leads to fragmented mitochondria in neurodegenerative diseases, mediated by nitric oxide and S-nitrosylation of dynamin-related protein 1, a mitochondrial outer membrane fission protein. Optic atrophy gene 1 (OPA1) is an inner membrane protein important for mitochondrial fusion. Autosomal dominant optic atrophy (ADOA), caused by mutations in OPA1, is a neurodegenerative disease affecting mainly retinal ganglion cells (RGCs). Here, we showed that OPA1 deficiency in an ADOA model influences N-methyl-D-aspartate (NMDA) receptor expression, which is involved in glutamate excitotoxicity and oxidative stress. Opa1enu/+mice show a slow progressive loss of RGCs, activation …
Contribution of recently measured nuclear data to reactor antineutrino energy spectra predictions
2013
This paper attempts to summarize the actual problematic of reactor antineutrino energy spectra in the frame of fundamental and applied neutrino physics. Nuclear physics is an important ingredient of reactor antineutrino experiments. These experiments are motivated by neutrino oscillations, i.e. the measure of the θ 13 mixing angle. In 2011, after a new computation of the reactor antineutrino energy spectra, based on the conversion of integral data of the beta spectra from 235 U, and 239;241 Pu, a deficit of reactor antineutrinos measured by short baseline experiments was pointed out. This is called the “reactor anomaly”, a new puzzle in the neutrino physics area. Since then, numerous new ex…
Total Absorption Spectroscopy Study ofRb92Decay: A Major Contributor to Reactor Antineutrino Spectrum Shape
2015
The antineutrino spectra measured in recent experiments at reactors are inconsistent with calculations based on the conversion of integral beta spectra recorded at the ILL reactor. (92)Rb makes the dominant contribution to the reactor antineutrino spectrum in the 5-8 MeV range but its decay properties are in question. We have studied (92)Rb decay with total absorption spectroscopy. Previously unobserved beta feeding was seen in the 4.5-5.5 region and the GS to GS feeding was found to be 87.5(25)%. The impact on the reactor antineutrino spectra calculated with the summation method is shown and discussed.
Smoke gets in euro-eyes: fusione e fissione del diritto comunitario
2021
This essay reconstructs the mechanism of the mutual “influence” between European Union Law and the Law of member states. In particular, the mechanism of the disapplication of domestic law has been assumed on the light of the comparison with the common law system and the relationship between equity and case law. Thanks to this comparative approach and the analysis of the jurisprudence of the Supreme Court (formerly House of Lords), the Author highlight the nature of “delegation” of powers and not of transfer of sovereignty inherent in the relations between member states and the European Union. At the same time, through the reconstruction of the jurispru- dence of the European Court of Justic…
Note e riflessioni a margine di un'opera riscoperta
2012
Il contributo prende in esame, in maniera multidisciplinare in occasione del cantiere di restauro, un dipinto tradizionalmente attribuito al Van Dyck, ricostruendo le vicende storiche dell'opera a partire dalle prime fonti ottocentesche e compiendo un'analisi storico-artistica sulla pittura, specificatamente tramite l'osservazione delle tecniche esecutive, e in relazione alla diffusa iconografia di cui si propone un ampio repertorio.
Anton van Dyck e la Crocifissione Villafranca di Palermo
2012
Il volume è composto da un saggio storico-artistico e da un saggio tecnico-scientifico inerente al restauro della tela con la Crocifissione, presente nella collezione dei principi di Villafranca di Palermo. I testi prendono in esame, confermandola, l'attribuzione di tradizione familiare e storica al pittore fiammingo Anton van Dyck, presente a Palermo tra il 1624 e il 1625, in ragione delle indagini diagnostiche, che il restauro ha offerto, e di considerazioni storico-artistiche. Nello specifico il saggio storico-artistico prende in esame il tema della Crocifissione di Van Dyck e da Van Dyck, forse per la prima volta pubblicando un’ampia rassegna di esemplari presenti in collezioni pubblich…
Observation of a $\gamma$-decaying millisecond isomeric state in $^{128}$Cd$_{80}$
2017
A. Jungclaus et al. -- 6 pags., 5 figs., 2 tabs. -- Open Access funded by Creative Commons Atribution Licence 4.0
Le caractère formatif d’un dispositif d’évaluation des enseignements par les étudiants (EEE) : une analyse de l’utilité des questionnements pour une …
2016
Cet article examine un dispositif d’évaluation des enseignements par les étudiants (EEE) en analysant les choix des équipes pédagogiques concernant les questionnaires qu’elles conçoivent. Cette étude est menée afin d’étudier la place possible de l’EEE dans le cadre de l’évaluation-conseil. En effet, pour que l’EEE soit utile aux enseignants, il convient que les questions posées aux étudiants permettent aux enseignants comme aux professionnels de l’accompagnement de s’inscrire dans une logique d’évaluation-conseil. Les résultats montrent leur intérêt dans ce cadre en fournissant aux enseignants des données qui leur permettent de conforter ou de modifier leurs enseignements. Ils soulignent ég…
First-forbidden transitions in reactor antineutrino spectra
2019
© 2019 American Physical Society. We study the dominant forbidden transitions in the antineutrino spectra of the fission actinides from 4 MeV onward using the nuclear shell model. Through explicit calculation of the shape factor, we show the expected changes in cumulative electron and antineutrino spectra. Relative to the allowed approximation this results in a minor decrease of electron spectra above 4 MeV, whereas an increase of several percent is observed in antineutrino spectra. We show that forbidden transitions dominate the spectral flux for most of the experimentally accessible range. Based on the shell model calculations we attempt a parametrization of forbidden transitions and prop…