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Search Results: 1 - 10 of 53068 matches for " Luis del Rio "
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Spectral measures of Jacobi operators with random potentials
Rafael del Rio,Luis O. Silva
Physics , 2009,
Abstract: Let $H_\omega$ be a self-adjoint Jacobi operator with a potential sequence $\{\omega(n)\}_n$ of independently distributed random variables with continuous probability distributions and let $\mu_\phi^\omega$ be the corresponding spectral measure generated by $H_\omega$ and the vector $\phi$. We consider sets $A(\omega)$ which depend on $\omega$ in a particular way and prove that $\mu_\phi^\omega(A(\omega))=0$ for almost every $\omega$. This is applied to show equivalence relations between spectral measures for random Jacobi matrices and to study the interplay of the eigenvalues of these matrices and their submatrices.
On the density of polynomials under perturbations of the measure
Rafael del Rio,Luis O. Silva
Physics , 2015,
Abstract: This paper presents an erroneous proof that if the polynomials are dense in $L_2(\mathbb{R}, \rho)$, then they are dense in $L_2(\mathbb{R}, \rho+\mu)$ where $\mu$ is a measure supported on a finite set of points.
Spectral analysis for semi-infinite mass-spring systems
Rafael del Rio,Luis O. Silva
Physics , 2013,
Abstract: We study how the spectrum of a Jacobi operator changes when this operator is modified by a certain finite rank perturbation. The operator corresponds to an infinite mass-spring system and the perturbation is obtained by modifying one interior mass and one spring of this system. In particular, there are detailed results of what happens in the spectral gaps and which eigenvalues do not move under the modifications considered. These results were obtained by a new tecnique of comparative spectral analysis and they generalize and include previous results for finite and infinite Jacobi matrices.
Inverse problems for Jacobi operators II: Mass perturbations of semi-infinite mass-spring systems
Rafael del Rio,Mikhail Kudryavtsev,Luis O. Silva
Physics , 2011,
Abstract: We consider an inverse spectral problem for infinite linear mass-spring systems with different configurations obtained by changing the first mass. We give results on the reconstruction of the system from the spectra of two configurations. Necessary and sufficient conditions for two real sequences to be the spectra of two modified systems are provided.
Inverse problems for Jacobi operators III: Mass-spring perturbations of semi-infinite systems
Rafael del Rio,Mikhail Kudryavtsev,Luis O. Silva
Physics , 2011,
Abstract: Consider an infinite linear mass-spring system and a modification of it obtained by changing the first mass and spring of the system. We give results on the interplay of the spectra of such systems and on the reconstruction of the system from its spectrum and the one of the modified system. Furthermore, we provide necessary and sufficient conditions for two sequences to be the spectra of the mass-spring system and the perturbed one.
Freedom of Conscience is Freedom of Choice: Women’s Reproductive Needs, Rights, and their Therapeutic Implications  [PDF]
Carlos M. Del Rio
Advances in Applied Sociology (AASoci) , 2012, DOI: 10.4236/aasoci.2012.23028
Abstract: Using reasonableness, we examine the U.S. Catholic bishops’ opposition to provisions of the Affordable Care Act of 2010. Weaving contributions from theology, philosophy, and jurisprudence, we emphasize the reasonable importance of mental health therapy for women within a relevant Catholic/Christian dialogue, particularly in the wake of the U.S. Supreme Court’s decision on healthcare. We principally identify socially imbedded factors that contribute to ending unwanted pregnancies, and argue that freedom of conscience is indeed freedom of choice within which women’s reproductive needs lie under protections of the U.S. Constitution. We recognize that Catholic tradition originates in the words and behaviors of Jesus. Examining closely these actions toward women, we find no reasonable justification for the bishops’ position against women’s freedom of conscience. We also discovered that revelation does not belong exclusively to the bishops; truth continues to be revealed to all human consciences, and true freedom does not allow for coercion/castigation of dogmatic import. We advocate for women’s ability to openly discuss their struggles to meet their reproductive condundra and to deconstruct their sexual stereotypes in mental health therapy. We provide crucial recommendations to augment choices for women’s reproduction condundra, and incite the need for new epistemic frameworks to address the complexity of female sexuality.
Hiperplasia suprarrenal congénita
Revista chilena de pediatría , 1973,
Paraneoplastic necrotizing myopathy in a woman with breast cancer: a case report
Joana Silvestre, Luis Santos, Vitor Batalha, Ana del Rio, Carlos Lima, Antonio Carvalho, Ana Martins, Helena Miranda, Fatima Cabral, Adelia Felix, Ana Aleixo
Journal of Medical Case Reports , 2009, DOI: 10.1186/1752-1947-3-95
Abstract: We present the case of a 53-year-old woman, born in Guinea-Bissau, with a history of locally advanced breast cancer, diagnosed ten months previously. The patient had experienced a progressively proximal muscle weakness of the lower extremities, which led to a total inability to walk. Upon neurological examination, the patient showed muscle weakness and atrophy in both proximal lower extremities without myalgia. Muscle strength was graded according to the Medical Research Council Scale as 2 out of 5 in the bilateral iliopsoas muscle, and 4 out of 5 in the bilateral quadriceps femoris. The deep-tendon reflexes were hypoactive. The laboratory examination showed increased values of serum creatinine kinase and myoglobin. An electromyogram showed an incomplete interference pattern during voluntary contraction in the iliopsoas and quadriceps femoris. The motor nerve conduction was 44.1 m/s and 44.3 m/s in the right and left tibial nerves, respectively, and 46.5 m/s and 46.1 m/s in the right and left peroneal nerves, respectively. The sensory motor nerve conductions and the compound motor action potential amplitudes were normal. These findings, despite not being specific, suggested a myopathy. Consequently, a muscle biopsy was performed. A biopsy specimen showed myopathic changes that were characteristic of a necrotizing myopathy.Treatment for this syndrome consists of controlling the tumor, and providing corticoid therapy. This led to the partial remission of the neurological manifestations.Neurologic paraneoplastic syndromes are characterized by neurological dysfunctions occuring in patients with cancer that are not attributed to a direct invasion of the central nervous system or to metastatic lesions. Neurologic paraneoplastic syndromes occur in less than 1% of patients with cancer [1] and usually precede the diagnosis of the cancer. The etiopathogenesis of these entities is unknown, and they are classified according to their anatomic location [2,3].Paraneoplastic necrot
Revis?o das diretrizes da Associa??o Médica Brasileira para o tratamento da depress?o (Vers?o integral)
Fleck, Marcelo P.;Berlim, Marcelo T.;Lafer, Beny;Sougey, Everton Botelho;Porto, José Alberto Del;Brasil, Marco Ant?nio;Juruena,rio Francisco;Hetem, Luis Alberto;
Revista Brasileira de Psiquiatria , 2009, DOI: 10.1590/S1516-44462009000500003
Abstract: objective: depression is a frequent, recurrent and chronic condition with high levels of functional disability. the brazilian medical association guidelines project proposed guidelines for diagnosis and treatment of the most common medical disorders. the objective of this paper is to present a review of the guidelines published in 2003 incorporating new evidence and recommendations. method: this review was based on guidelines developed in other countries and systematic reviews, randomized clinical trials and when absent, observational studies and recommendations from experts. the brazilian medical association proposed this methodology for the whole project. the review was developed from new international guidelines published since 2003. results: the following aspects are presented: prevalence, demographics, disability, diagnostics and sub-diagnosis, efficacy of pharmacological and psychotherapeutic treatment, costs and side-effects of different classes of available drugs in brazil. strategies for different phases of treatment are also discussed. conclusion: the guidelines are an important tool for clinical decisions and a reference for orientation based on the available evidence in the literature.
del Rio Ferretti,Carlos;
Ius et Praxis , 2008, DOI: 10.4067/S0718-00122008000200004
Abstract: this research is about the matching duty of the criminal judgement and problems that come along with its application by the chilean tribunals (and literature). the topic is analyzed setting the technical support after which builds on that obligation, as in the definition of the subject of the criminal procedure from a precise concept of the punishable act from a procedural perspective. this is the reason why we study the technical and theoretical positions about the concept of ?fact? more appropriate to understand the complex issue that involves the matching duty of the criminal judgement, to resolve the problems that come along with is application as we explain in this study. to this purpose we analyze naturalists and normatives theories about the concept of ?fact? and intend proving the practical consequence wether you submit to one or another theory.
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