Search results for "Gall"

Failure analysis of normally-off GaN HEMTs under avalanche conditions

2020

Gallium nitride (GaN) high electron-mobility transistors (HEMTs) are promising devices in the power electronics field owing to their wide bandgap (WBG). However, all the potential advantages provided by their WBG require reliability improvement. In industrial applications, robustness is one of the main factors considered by circuit designers. This study focuses on the observation of the degradation behavior of the main waveforms of unclamped inductive-switching (UIS) test circuits of two different commercial GaN HEMT structures. The relevance of this study lies in the potential applications of these devices to high-voltage applications and automotive systems where they are subjected to many…

Sludge and stones in gallbladder after pregnancy

1987

Summary The prevalence of sludge and stones in the gallbladder of 298 women in the immediate post-partum period was ultrasonographically assessed. We have investigated some risk factors for the development of sludge or stones in these patients and followed up most of these patients by ultrasonography to detect the presence of sludge and/or stones in the year following their discovery. We found sludge in 80 (26.2%) and gallstones in 16 (5.2%) of these patients. Age, obesity and months of oral contraceptive use were risk factors only for the presence of gallstones. After 1 year of follow-up only 2 out of 45 patients with sludge but 13 out of 15 patients with gallstones still had abnormal ultr…

Modulation of Nrf2/ARE pathway by food polyphenols: a nutritional neuroprotective strategy for cognitive and neurodegenerative disorders

2011

In recent years, there has been a growing interest, supported by a large number of experimental and epidemi-ological studies, for the beneficial effects of some phenolic substances, contained in commonly used spices and herbs, in preventing various age-related pathologic conditions, ranging from cancer to neurodegenerative diseases. Although the exact mechanisms by which polyphenols promote these effects remain to be elucidated, several reports have shown their ability to stimulate a general xenobiotic response in the target cells, activating multiple defense genes. Data from our and other laboratories have previously demonstrated that curcumin, the yellow pigment of curry, strongly induces…

Sur la francisation d’un toponyme écossais : l’« Argail » de Charles Nodier

2011

International audience; This study opposes, on the one hand, the concept exposed by linguist and theoretician Charles Nodier (1780-1844) in his Elementary Notions in Linguistics (1834) referring to the inalterable spelling of proper nouns, and, on the other hand, his practice as a storyteller and creator in his Trilby (1822). We will also consider answering the question of the gallicization of the toponym "Argyle" (allusion to the lake region in Scotland), spelled "Argail" by Nodier in his tale, contrary to all expectations. "Argail" , beyond the mere process of transliteration and trompe-l’oeil justifications revealed by Nodier himself in the preface of his book, opens up to subtle manipul…

Properzio e Cornelio Gallo: il modello 'cogente', il modello 'sfuggente'

2014

Se la scoperta del papiro di Qaṣr Ibrîm ha ampliato le nostre conoscenze sulla produzione di Cornelio Gallo, la fisionomia di questi distici ha consentito di retrodatare l’apparizione del servitium amoris e delle lamentele sulla nequitia puellae restituendo a Gallo la paternità di entrambi e alla sua poesia un ruolo paradigmatico. Viceversa, per quel che concerne il fr. 4, il complesso legame che intercorre fra le Muse, Licoride e l’autore non permette di ipotizzare diretti influssi sulla creazione della figura della puella carminum iudex compiuta da Properzio soprattutto nel secondo libro delle Elegie. Un modello soggetto a continui riadattamenti appare viceversa il fr. 3, dedicato alla ma…

I lavacri inferi di Cornelio Gallo (Nota a Properzio, II 34, 91-92)

2011

Il ritratto di Cornelio Gallo che Properzio abbozza nella chiusa di II, 34 descrive un miles amoris intento a lavarsi le ferita infertegli da Licoride, l'amata, nell'Oltretomba rinnovando in senso elegiaco lo stereotipo dei lavacri funebri degli eroi caro all'epos greco e latino.

Querns and mills during Roman times at the northern frontier of the Roman Empire (Belgium, Northern France, Southern Netherlands, Western Germany): U…

2016

International audience; This paper presents the results of a multi-disciplinary provenance study of querns and millstones during the Roman period (1st-4th century CE) in the northern part of the Roman Empire (provinces of Gallia Belgica and Germania Inferior). Comparative petrographical, mineralogical and geochemical analysis allowed an international team of archaeologists and geologists to identify the different raw materials used for the manufacturing of querns and millstones. As a result, (litho-) stratigraphic assignments as well as geological-geographical provenances are suggested or corroborated for the broad spectrum of these natural geo-materials. We give evidence for the exploitati…

Dependence of the lattice parameters and the energy gap of zinc-blende-type semiconductors on isotopic masses.

1996

The dependence of the ${\mathit{E}}_{0}$ direct gap of Ge, GaAs, and ZnSe on isotopic masses at low temperatures has been investigated. Contributions of the variation of the lattice parameter to the gap shift of the binary compounds have been evaluated by using a volume-dependent lattice dynamics, while local empirical pseudopotential techniques have been employed to calculate gap shifts due to electron-phonon interaction. The dependence of these terms on the lattice-dynamical model and on the q\ensuremath{\rightarrow}0 extrapolation of the pseudopotential form factors has been investigated. The contributions of the optical and acoustical modes to the isotopic shift are analyzed. The result…

NEUROPHYSIOLOGICAL AND NEUROCHEMICAL STUDIES WITH THE ISONICOTINOYLHYDRAZONE OF PYRIDOXAL 5-PHOSPHATE.

1964

Particle size-related limitations of persistent phosphors based on the doped Y3Al2Ga3O12 system

2021

AbstractCo-doped Ce3+, Cr3+ and Pr3+ yttrium–aluminium–gallium garnet powders of various sizes were obtained by co-precipitation method. The microstructure and morphology were investigated by XRPD, TEM and gas porosimetry. The luminescence properties were studied by excitation and emission spectra, quantum yield and decay times. Thermoluminescence measurements were performed to evaluate the activation energy, traps redistribution and frequency factor. Limitation in the energy transfer between dopant ions in the small particles, traps depth and surface defects were considered and investigated as responsible for the quenching of persistent luminescence. The phosphors annealed at 1100 °C show …