The supercuspidal representations of p-adic classical groups

Let G be a unitary, symplectic or special orthogonal group over a locally compact non-archimedean local field of odd residual characteristic. We construct many new supercuspidal representations of G, and Bushnell-Kutzko types for these representations. Moreover, we prove that every irreducible supercuspidal representation of G arises from our constructions.Comment: 55 pages -- minor changes from 1st version (mostly in sections 2.2, 4.2 and 6.2). To appear in Inventiones mathematicae, 2008 (DOI is not yet active as at 12 Nov 2007

Global disparities in surgeons’ workloads, academic engagement and rest periods: the on-calL shIft fOr geNEral SurgeonS (LIONESS) study

: The workload of general surgeons is multifaceted, encompassing not only surgical procedures but also a myriad of other responsibilities. From April to May 2023, we conducted a CHERRIES-compliant internet-based survey analyzing clinical practice, academic engagement, and post-on-call rest. The questionnaire featured six sections with 35 questions. Statistical analysis used Chi-square tests, ANOVA, and logistic regression (SPSS® v. 28). The survey received a total of 1.046 responses (65.4%). Over 78.0% of responders came from Europe, 65.1% came from a general surgery unit; 92.8% of European and 87.5% of North American respondents were involved in research, compared to 71.7% in Africa. Europe led in publishing research studies (6.6 ± 8.6 yearly). Teaching involvement was high in North America (100%) and Africa (91.7%). Surgeons reported an average of 6.7 ± 4.9 on-call shifts per month, with European and North American surgeons experiencing 6.5 ± 4.9 and 7.8 ± 4.1 on-calls monthly, respectively. African surgeons had the highest on-call frequency (8.7 ± 6.1). Post-on-call, only 35.1% of respondents received a day off. Europeans were most likely (40%) to have a day off, while African surgeons were least likely (6.7%). On the adjusted multivariable analysis HDI (Human Development Index) (aOR 1.993) hospital capacity > 400 beds (aOR 2.423), working in a specialty surgery unit (aOR 2.087), and making the on-call in-house (aOR 5.446), significantly predicted the likelihood of having a day off after an on-call shift. Our study revealed critical insights into the disparities in workload, access to research, and professional opportunities for surgeons across different continents, underscored by the HDI

(100) facets of gamma-Al2O3: The Active Surfaces for Alcohol Dehydration Reactions

Temperature programmed desorption (TPD) of ethanol, as well as ethanol and methanol dehydration reactions were studied on gamma-Al2O3 in order to identify the active catalytic sites for alcohol dehydration reactions. Two high temperature (> 473 K) desorption features were observed following ethanol adsorption. Samples calcined at T a parts per thousand currency sign 473 K displayed a desorption feature in the 523-533 K temperature range, while those calcined at T a parts per thousand yen 673 K showed a single desorption feature at 498 K. These two high temperature desorption features correspond to the exclusive formation of ethylene on the Lewis (498 K) and Bronsted acidic (similar to 525 K) sites. The amount of ethylene formed under conditions where the competition between water and ethanol for adsorption sites is minimized is identical over the two surfaces. Furthermore, a nearly 1-to-1 correlation between the number of under-coordinated Al3+ ions on the (100) facets of gamma-Al2O3 and the number of ethylene molecules formed in the ethanol TPD experiments on samples calcined at T a parts per thousand yen 673 K was found. Titration of the penta-coordinate Al3+ sites on the (100) facets of gamma-Al2O3 by BaO completely eliminated the methanol dehydration reaction activity. These results demonstrate that in alcohol dehydration reactions on gamma-Al2O3, the (100) facets are the active catalytic surfaces. The observed activities can be linked to the same Al3+ ions on both hydrated and dehydrated surfaces: penta-coordinate Al3+ ions (Lewis acid sites), and their corresponding -OH groups (Bronsted acid sites), depending on the calcination temperatureclose363

Sur certains 'el'ements r'eguliers des groupes de Weyl et les vari'et'es de Deligne--Lusztig associ'ees

Introduction Cet article est une 'etape vers la compr'ehension de la forme particuli`ere que prennent, dans le cas des groupes r'eductifs finis G F , les conjectures g'en'erales 'enonc'ees dans [Br] pour les blocs `a groupes de d'efaut ab'eliens des groupes finis "abstraits". Apr`es avoir v'erifi'e l'aspect de ces conjectures portant sur les caract`eres des groupes r'eductifs finis (cf. [BrMaMi]), il reste `a 'etablir la version, beaucoup plus profonde et difficile, portant sur les 'equivalences de cat'egories d'eriv'ees concern'ees. Certaines de ces 'equivalences devraient en particulier etre fournies par les cohomologies 'etales de faisceaux convenables sur les vari'et'es de Deligne-Lusztig Xw associ'ees `a certains 'el'ements r'eguliers w du groupe de Weyl W de G (cf. [BrMa], x1). Ceci implique des propri'et'es particuli`eres de la cohomologie 'e

Adsorption and Formation of BaO Overlayers on gamma-Al2O3 Surfaces

First-principles density functional theory slab calculations were used to investigate adsorption, clustering, and overlayer formation of BaO on gamma-Al2O3 surfaces. Multiple stable adsorption configurations were identified for adsorbed BaO monomers and (BaO)(2) dimers on both (100) and (110) surfaces of gamma-Al2O3. Adsorption of BaO and (BaO)(2) induces significant relaxation of these gamma-Al2O3 surfaces. At high BaO coverage, up to a 1:1 ratio of BaO units to surface Al atoms, the adsorbed BaO monomers condensed, organizing to form a buckled monolayer-like overlayer on the surface. An "aggregation energy" was used to characterize this clustering of adsorbed BaO on the surface. Our results show that the initial BaO adsorption configuration has a strong effect on clustering and overlayer formation. A weakly adsorbed BaO monomer will thermodynamically favor clustering over being isolated. On the fully dehydrated gamma-Al2O3(100) surface, the clustering of BaO was thermodynamically unfavorable until 4.26 BaO/nm(2) if the additional BaO was from the most stable monomer adsorption sites; that is, those present at low BaO loadings. In contrast, aggregation became favorable if the additional BaO was from less stable sites occupied by BaO at high loadings. On the fully dehydrated gamma-Al2O3(110) surface, the formation of a BaO dimer was found to have the highest energy cost. On the other hand, the presence of hydroxyls on the surface enhances the stability of the adsorbed BaO monomers. As such, isolated BaO islands, rather than a complete BaO overlayer, are expected on the hydroxylated gamma-Al2O3 surfaces, consistent with recent experimental observationsclose192