9,857 research outputs found
The coupling of local discontinuous Galerkin and conforming finite element methods
No full textPerugia, Ilaria; Schotzau, Dominik. (2000). The coupling of local discontinuous Galerkin and conforming finite element methods. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/3490
Stabilized interior penalty methods for the time-harmonic Maxwell equations
No full textWe propose stabilized interior penalty discontinuous Galerkin methods for the indefinite
time–harmonic Maxwell system. The methods are based on a mixed formulation of the
boundary value problem chosen to provide control on the divergence of the electric field.
We prove optimal error estimates for the methods in the special case of smooth coefficients
and perfectly conducting boundary using a duality approach.Supported in part by the NSF (Grant DMS-9807491) and by the Supercomputing Institute
of the University of Minnesota. This work was carried out when the author was visiting
the School of Mathematics, University of Minnesota
The hp-local discontinuous Galerkin method for low-frequency time-harmonic Maxwell equations
No full text
University-to-work transitions: an empirical analysis on Perugia graduates
No full textThe article investigates the transitions of graduates of a middle-sized Italian university into the provincial labour market. University of Perugia administrative information and data from the job centres in the province are matched to reconstruct the timing of the university-to-work transitions of graduates since January 2004 to July 2009. Cox proportional hazard model with competing risk is used to determine the role of individual and studying characteristics in affecting the employment probabilities of graduates. Our main findings concern the relevance of degree specialization and accumulation of generic job experiences. Controlling for selection due to unobserved transitions of graduates finding a job outside the province of Perugia does not change our results significantly. Even though our results cannot be generalized to the national context, they constitute an innovative step of analysis to derive crucial considerations and policy implications concerning the transition of graduates into the local labour market
Agiografia e culto dei santi a Perugia fra alto e basso medioevo
No full textEsame delle leggende dei santi Felino, Fiorenzo, Costanzo ed Ercolano, alla luce dei rispettivi culti e delle dinamiche istituzionali e socio-religiose della città di Perugia tra VI e XII secolo. In Appendice si pubblicano le edizioni della "Passio sancti Herculani episcopi", dei "Miracula sancti Herculani" e dell'"Ufficio liturgico per la festa di s. Ercolano"
DEGENERATIVE SPONDYLOLISTHESIS.II. SURGICAL TREATMENT
No full textThe authors analyze the results of operative treatment in 32 cases of degenerative spondylolisthesis with various degrees of compression of the nervous structures. Five types of surgery were performed: unilateral laminotomy; bilateral laminotomy with or without transverse process fusion; bilateral laminectomy with or without spinal fusion; and laminectomy, spinal fusion, and interspinous wiring. Satisfactory results were achieved in 84% of the cases. Seventy-six percent of the patients had further vertebral displacement, and 81% showed varying degrees of articular process regeneration more than two years after surgery; these findings concern both patients who had been treated with spinal fusion and those who had not. Bilateral laminotomy is indicated in patients with isolated nerve root canal stenosis; as the olisthesis is mild and lateral flexion-extension radiographs show no vertebral hypermobility, spinal fusion is not necessary. When central spinal canal stenosis is present, bilateral laminectomy, extensive lateral decompression, and spinal fusion are recommended. Interspinous wiring may be useful for immediate vertebral stabilization
Microdiscectomy in treatment of herniated lumbar disc.
No full textThe authors studied 122 patients who had undergone microsurgery for herniated lumbar disc or isolated nerve root canal stenosis. The patients were reviewed one month and three months after surgery and then returned for a final evaluation after an average of 1.4 years. Intraoperative or postoperative complications occurred in 13 cases and consisted of misdiagnosis (discovered intraoperatively) of the level of the herniated disc (7 cases), dural laceration (3 cases), and discitis (3 cases). Limited discectomy was performed in 16 cases and complete discectomy in the others. Two patients who had undergone limited discectomy experienced recurrence; this did not occur when complete discectomy was performed. Discitis occurred in patients who had undergone complete discectomy. Most of the patients who underwent operation for disc herniation at one lumbar level with no complications began walking within 24 hours, and 72% were discharged within 36 hours. Eighty-five percent of the patients had a satisfactory result one month after surgery, and 91% had a satisfactory result at the final follow-up. There was no significant difference between patients with protruded herniation and patients with sequestered herniation. In the patients with nerve root canal stenosis the proportion of satisfactory results was 72% at one month and 88% at the final follow-up. The main advantage of microsurgery is the full illumination of the operative field, and this technique is strongly indicated in cases of single-level herniated disc. Over the short-term, microdiscectomy achieves a higher proportion of satisfactory results, requires a shorter hospitalization period, and allows an earlier return to work than traditional surgery. However, no significant difference was found between microsurgery and traditional surgery over the long-term
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