Singular pp-biharmonic problems involving the Hardy-Sobolev exponent

This paper is concerned with existence results for the singular $p$-biharmonic problem involving the Hardy potential and the critical Hardy-Sobolev exponent. More precisely, by using variational methods combined with the Mountain pass theorem and the Ekeland variational principle, we establish the existence and multiplicity of solutions. To illustrate the usefulness of our results, an illustrative example is also presented

Extremal Black Attractors in 8D Maximal Supergravity

Motivated by the new higher D-supergravity solutions on intersecting attractors obtained by Ferrara et al. in [Phys.Rev.D79:065031-2009], we focus in this paper on 8D maximal supergravity with moduli space [SL(3,R)/SO(3)]x[SL(2,R)/SO(2)] and study explicitly the attractor mechanism for various configurations of extremal black p- branes (anti-branes) with the typical near horizon geometries AdS_{p+2}xS^{m}xT^{6-p-m} and p=0,1,2,3,4; 2<=m<=6. Interpretations in terms of wrapped M2 and M5 branes of the 11D M-theory on 3-torus are also given. Keywords: 8D supergravity, black p-branes, attractor mechanism, M-theory.Comment: 37 page

Iatrogenic pneumothorax: experience of a Moroccan Emergency Center

AbstractThe incidence of iatrogenic pneumothorax (IPx) will increase with invasive procedures particularly at training hospitals, which is why we have made a retrospective study of the common diagnostic or therapeutic causes of IPx and its impact on morbidity. From January 2011 to December 2012, 36 patients developed IPx as emergencies, after an invasive procedure .Their mean age was 38 years (range: 19-69 years). Of the patients, 21 (58%) were male and 15 (42%) were female. The purpose was diagnostic in 6 cases and therapeutic in 30 cases. In 8 patients (22%) the procedure was performed due to underlying lung diseases and in 28 patients (78%) for other diseases. The procedure most frequently causing IPnx was central venous catheterization, with 20 patients (55%), other frequent causes were mechanical ventilation, 8 cases (22%) of whom we reported 3 cases of bilateral pneumothorax, 6 cases of thoracentesis (16%) and 2 patients had life-saving percutaneous tracheotomy. The majority of our patients were managed by a small chest tube placement (unilateral n=30, bilateral n=3).The average duration of drainage was 3 days (range: 1-15 days), sadly one of our patients died of ischemic brain damage 15 days after tracheotomy.At training hospitals the incidence of IPnx will increase with the increase in invasive procedures, which should only be performed by experienced personnel or under their supervision

Machine learning one-dimensional spinless trapped fermionic systems with neural-network quantum states

We compute the ground-state properties of fully polarized, trapped, one-dimensional fermionic systems interacting through a gaussian potential. We use an antisymmetric artificial neural network, or neural quantum state, as an ansatz for the wavefunction and use machine learning techniques to variationally minimize the energy of systems from 2 to 6 particles. We provide extensive benchmarks with other many-body methods, including exact diagonalisation and the Hartree-Fock approximation. The neural quantum state provides the best energies across a wide range of interaction strengths. We find very different ground states depending on the sign of the interaction. In the non-perturbative repulsive regime, the system asymptotically reaches crystalline order. In contrast, the strongly attractive regime shows signs of bosonization. The neural quantum state continuously learns these different phases with an almost constant number of parameters and a very modest increase in computational time with the number of particles

Long-term Outcome of Hirschsprung Disease: Impact on Quality of Life and Social Condition at Adult Age

BACKGROUND: Hirschsprung disease is a rare congenital disease typically requiring surgical treatment during childhood. Quality of life and social condition at adult age can be impaired by disease-specific sequelae. OBJECTIVE: This study aimed to assess the quality of life and social outcome of adult patients operated on for Hirschsprung disease during childhood. DESIGN: Patients operated on for Hirschsprung disease during childhood were identified and specific questionnaires were sent to them. SETTINGS: Data from 2 referral centers were used. PATIENTS: Patients who completed the questionnaires regarding quality of life and social condition were included. MAIN OUTCOME MEASURES: The Hirschsprung\u27s Disease and Anorectal Malformations Quality of Life disease-specific questionnaire (8 dimensions explored; each scored from 0 to 100 maximum score) and a sociodemographic questionnaire were sent to identified patients. Sociodemographic data were compared with those of the French general population. RESULTS: Thirty-four patients had Hirschsprung disease (men, 76%; mean age, 32 years) were included in the study. Mean total Hirschsprung\u27s Disease and Anorectal Malformations Quality of Life score was 611 of 800 (maximum score 800). The 2 most impaired dimensions were "physical symptoms" and "diarrhea" (62.9/100 and 73.6/100). Fecal continence was only marginally affected (mean score, 89/100). Patients with Hirschsprung disease achieved better educational levels than the French general population. Parental and marital status did not differ between the 2 groups. LIMITATIONS: This study had the limitations inherent to a retrospective study. CONCLUSION: The quality of life of adult patients with Hirschsprung disease sequelae is marginally impaired in this study. Despite the consequences of this congenital abnormality, the condition eventually achieved can be considered as satisfactory. See Video Abstract at http://links.lww.com/DCR/A917

A Review on Multi-Terminal High Voltage Direct Current Networks for Wind Power Integration

With the growing pressure to substitute fossil fuel-based generation, Renewable Energy Sources (RES) have become one of the main solutions from the power sector in the fight against climate change. Offshore wind farms, for example, are an interesting alternative to increase renewable power production, but they represent a challenge when being interconnected to the grid, since new installations are being pushed further off the coast due to noise and visual pollution restrictions. In this context, Multi-Terminal High Voltage Direct Current (MT-HVDC) networks are the most preferred technology for this purpose and for onshore grid reinforcements. They also enable the delivery of power from the shore to offshore Oil and Gas (O&amp;G) production platforms, which can help lower the emissions in the transition away from fossil fuels. In this work, we review relevant aspects of the operation and control of MT-HVDC networks for wind power integration. The review approaches topics such as the main characteristics of MT-HVDC projects under discussion/commissioned around the world, rising challenges in the control and the operation of MT-HVDC networks and the modeling and the control of the Modular Multilevel Converter (MMC) stations. To illustrate the challenges on designing the control system of a MT-HVDC network and to corroborate the technical discussions, a simulation of a three-terminal MT-HVDC network integrating wind power generation and offshore O&amp;G production units to the onshore grid is performed in Matlab's Simscape Electrical toolbox. The results highlight the main differences between two alternatives to design the control system for an MT-HVDC network

Toric Calabi-Yau supermanifolds and mirror symmetry

We study mirror symmetry of supermanifolds constructed as fermionic extensions of compact toric varieties. We mainly discuss the case where the linear sigma A-model contains as many fermionic fields as there are U(1) factors in the gauge group. In the mirror super-Landau-Ginzburg B-model, focus is on the bosonic structure obtained after integrating out all the fermions. Our key observation is that there is a relation between the super-Calabi-Yau conditions of the A-model and quasi-homogeneity of the B-model, and that the degree of the associated superpotential in the B-model is given in terms of the determinant of the fermion charge matrix of the A-model.Comment: 20 pages, v2: references adde

Dominantes pathologiques chez les caprins du Nord Marocain: cas de la région de Tétouan

Dans le but de caractériser les dominantes pathologiques des caprins dans la province de Tetouan, un suivi clinique a porté sur 13 élevages caprins de décembre 1993 à mai 1994. En plus, une étude lésionnelle macroscopique et microscopique a été réalisée sur 400 carcasses de caprins au niveau de 2 abattoirs ruraux. La fréquence de mortalité moyenne dans les élevages suivis était de 22,4% et la mortalité a touché plus les chevreaux de moins d’un mois d’âge (82,5%). Les fréquences d’avortements variaient de 5,3% à 13.3% avec une fréquence moyenne de 7,2% et affectaient beaucoup plus les chèvres primipares (60%). Les diarrhées des chevreaux ont été notées dans 38% des élevages avec une fréquence moyenne de morbidité de 22,4% et elles étaient responsables de 45% des mortalités des chevreaux. La phtiriose a été observée dans 100% des élevages avec une fréquence moyenne de morbidité de 13%. Les abcès ganglionnaires (lymphadénite caséeuse) ont été observés dans 38% des élevages. Sur les carcasses examinées à l’abattage, les broncho-pneumonies vermineuses étaient les plus fréquentes (49%) suivies des kystes hydatiques pulmonaires et/ou hépatiques (9%), des hépato-cholangites (7%) et la cysticercose hépato-péritonéale (6%). D’autres lésions comme l’ictère, l’adénomatose et la lymphdénite caséeuse ont été relevées mais avec une fréquence moindre. Au total 160 poumons (80% des organes porteurs de lésions) et 30 foies (55%) ont été saisis totalement contre 41 poumons (20%) et 22 foies (45%) saisis partiellement. Ces résultats montrent l’importance des pertes économiques dues aux problèmes pathologiques que subit l’élevage caprin de la région de Tétouan en l’absence de toute intervention technique