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Search Results: 1 - 10 of 35551 matches for " Elias Daniel; "
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Benefits of Objective Collapse Models for Cosmology and Quantum Gravity
Elias Okon,Daniel Sudarsky
Physics , 2013, DOI: 10.1007/s10701-014-9772-6
Abstract: We display a number of advantages of objective collapse theories for the resolution of long-standing problems in cosmology and quantum gravity. In particular, we examine applications of objective reduction models to three important issues: the origin of the seeds of cosmic structure, the problem of time in quantum gravity and the information loss paradox; we show how reduction models contain the necessary tools to provide solutions for these issues. We wrap up with an adventurous proposal, which relates the spontaneous collapse events of objective collapse models to microscopic virtual black holes.
Measurements according to Consistent Histories
Elias Okon,Daniel Sudarsky
Physics , 2013,
Abstract: We critically evaluate the treatment of the notion of measurement in the Consistent Histories approach to quantum mechanics. We find such a treatment unsatisfactory because it relies, often implicitly, on elements external to those provided by the formalism. In particular, we note that, in order for the formalism to be informative when dealing with measurement scenarios, one needs to assume that the appropriate choice of framework is such that apparatuses are always in states of well defined pointer positions after measurements. The problem is that there is nothing in the formalism to justify this assumption. We conclude that the Consistent Histories approach, contrary to what is claimed by its proponents, fails to provide a truly satisfactory resolution for the measurement problem in quantum theory.
On the Consistency of the Consistent Histories Approach to Quantum Mechanics
Elias Okon,Daniel Sudarsky
Physics , 2013, DOI: 10.1007/s10701-013-9760-2
Abstract: The Consistent Histories (CH) formalism aims at a quantum mechanical framework which could be applied even to the universe as a whole. CH stresses the importance of histories for quantum mechanics, as opposed to measurements, and maintains that a satisfactory formulation of quantum mechanics allows one to assign probabilities to alternative histories of a quantum system. It further proposes that each realm, that is, each set of histories to which probabilities can be assigned, provides a valid quantum-mechanical account, but that different realms can be mutually incompatible. Finally, some of its proponents offer an "evolutionary" explanation of our existence in the universe and of our preference for quasiclassical descriptions of nature. The present work questions the validity of claims offered by CH proponents asserting that it solves many interpretational problems in quantum mechanics. In particular, we point out that the interpretation of the framework leaves vague two crucial points, namely, whether realms are fixed or chosen and the link between measurements and histories. Our claim is that by doing so, CH overlooks the main interpretational problems of quantum mechanics. Furthermore, we challenge the evolutionary explanation offered and we critically examine the proposed notion of a realm-dependent reality.
Rouquier Complexes are Functorial over Braid Cobordisms
Ben Elias,Daniel Krasner
Mathematics , 2009,
Abstract: Using the diagrammatic calculus for Soergel bimodules developed by B. Elias and M. Khovanov, we show that Rouquier complexes are functorial over braid cobordisms. We explicitly describe the chain maps which correspond to movie move generators.
Common Preventable Health and Social Problems Encountered by Elderly in Shinyanga Region in the Northern Part of Tanzania  [PDF]
Sospatro E. Ngallaba, Daniel J. Makerere, Elias C. Nyanza, Anthony Kapesa, Karol Marwa
Open Journal of Preventive Medicine (OJPM) , 2016, DOI: 10.4236/ojpm.2016.63010
Abstract: Background: In Tanzania elders are respected as repositories of inherited wisdom, experienced and principal decision makers in the community. However, evidence shows that such repositories are no longer considered important in most societies. As a result elders are neglected with some mistreatment in terms of provision of health and social services for instance; at times they get denied and ignored of their obvious rights, ignoring their retirement benefits and the rights onto free social services as per the Tanzania National Ageing Policy of 2003. Elders are therefore faced with physical, psychological and geriatric social suffering. It is on this basis that this study tries to explore the common preventable health and social problems encountered by elderly in Shinyanga Region in northern part of Tanzania. Methods: Across sectional community based study of 465 subjects randomly selected was done in three wards of Kahama District. The district was selected randomly out of 8 districts of Shinyanga Region, structured questionnaires with both closed and opened endower used; the information was collected from house to house and other information collected from health facilities within the wards as every ward had one public health facility; subjects (respondents) were obtained using purposive sampling technique aiming at elderly with 60 years of age and above. Results: Kahama district has a population of approximately 36,014 of which 1500 (4%) are in the elderly age group of 60 years and above. The study population was 465 which is 30% (465/1500) of the geriatric population of Kahama. Among this group 5% were female while 41% were male and 53% (248/465) were married. 64% (297/465) were taking care of themselves, 32% (150/465) cared by relatives and 4% (18/465) cared by the community. Among the respondents, 40% (185/465) were affected by HIV/AIDs in one way or another either living with orphans whose parents died of HIV/AIDS or asking care of the infected patients within the family. It was also found that 73% of the geriatrics were not exempted from medical treatment fees so they had to pay for their medical care. However, only 32% were aware of getting free treatment and 61% of the study populations were not satisfied with the medical care provided at the public health facilities. The common diseases affecting this age group are: Eye problem 59% (273/465); Arthritis 52% (241/465); Dental problems 27% (124/465); Hypertension 23% (107/465); Backache 22% (105/465); Malaria 28% (132/465); Hearing problems 26% (121/645); Urinary tract Infection 35% (165/465);
On the minimum of a polynomial function on a basic closed semialgebraic set and applications
Gabriela Jeronimo,Daniel Perrucci,Elias Tsigaridas
Computer Science , 2011,
Abstract: We give an explicit upper bound for the algebraic degree and an explicit lower bound for the absolute value of the minimum of a polynomial function on a compact connected component of a basic closed semialgebraic set when this minimum is not zero. As an application, we obtain a lower bound for the separation of two disjoint connected components of basic closed semialgebraic sets, when at least one of them is compact.
Upper Cervical Spine Infection. Complication of Hypopharyngeal Injury  [PDF]
Ghassan Skaf, Elias Elias
International Journal of Otolaryngology and Head & Neck Surgery (IJOHNS) , 2016, DOI: 10.4236/ijohns.2016.52016
Abstract: Background: We describe a rare case of Candida albicans retropharyngeal infection with upper cervical spondylodiscitis associated with epidural abscess triggered by ingestion of a chicken bone. Case Description: A 63-year-old woman presented with posterior neck and bilateral shoulders pain three weeks after choking on a 2-centimeter chicken bone. Magnetic resonance imaging (MRI) revealed spondylodiscitis and epidural abscess with significant spinal cord compression at C2 and C3 levels. A Barium swallow showed a focal disruption of the posterior wall of the esophagus. A posterior upper cervical fixation (C2-C5) was initially performed. One week later an anterior decompressive procedure was carried out followed by iliac crest bony fusion, and repair of the esophageal defect. Intra-operative cultures showed heavy growth of Candida albicans. After a transitory post-operative neurologic worsening, and after six weeks of appropriate antifungal therapy, the patient achieved a full clinical and radiologic recovery. Conclusion: Prompt surgical debridement, fusion and stabilization combined with adequate antimicrobial agents are necessary to guarantee a good outcome and reverse the neurological deficits.
Regionaliza??o e dinamica política do federalismo sanitário brasileiro
Dourado,Daniel de Araujo; Elias,Paulo Eduardo Mangeon;
Revista de Saúde Pública , 2011, DOI: 10.1590/S0034-89102011000100023
Abstract: the implications from the brazilian federal structure on the regionalization of health actions and services in the national unified health system (sus) were analyzed, considering that the regional health planning in brazil takes place within the context of intergovernmental relations as an expression of cooperative federalism in health. the analysis was based on a historical approach to brazilian health federalism, recognizing two development periods, decentralization and regionalization. regional health planning of sus was explored in light of the theoretical framework of federalism. it is concluded that relative centralization of the process is needed in intergovernmental committees to actualize federal coordination and that it is essential to consider formalizing opportunities for dissent, both in regional management boards and in the intergovernmental committees, so that the consensus decision-making can be accomplished in healthcare regionalization.
Tratamento cirúrgico das fraturas dos metatársicos laterais com técnica percutanea anterógrada: descri o técnica e resultados clínicos Anterograde percutaneous treatment of lesser metatarsal fractures: technical description and clinical results
Daniel Baumfeld,Benjamim Dutra Macedo,Caio Nery,Leonardo Elias Esper
Revista Brasileira de Ortopedia , 2012,
Abstract: OBJETIVO: O objetivo deste trabalho é avaliar os resultados obtidos com a técnica de fixa o anterógrada percutanea para o tratamento das fraturas do colo e diáfise dos metatársicos laterais. MéTODOS: Realizamos avalia o prospectiva de 14 pacientes operados no período de 2003 a 2008, em que foram levados em considera o a topografia das fraturas, o mecanismo de trauma, as comorbidades associadas e o escore AOFAS para o antepé. RESULTADOS: A regi o anat mica mais atingida foi o colo dos metatársicos (79%); o acometimento de múltiplos metatársicos ( 53%) foi mais comum que o acometimento isolado (47%); o trauma de baixa energia (79%) foi mais frequente do que o de alta energia (21%); pacientes do sexo feminino com diabetes mellitus apresentaram os piores resultados funcionais pós-operatórios. N o foram encontradas complica es pós-operatórias relacionadas com o tipo de tratamento instituído. CONCLUS ES: A técnica cirúrgica apresentada demonstrou ser eficiente para o tratamento das fraturas dos metatarsos laterais com menor índice de complica es do que as técnicas já existentes na literatura. OBJECTIVE: The aim of this study was to evaluate the results obtained using the anterograde percutaneous fixation technique for treating shaft and neck fractures of the lesser metatarsals. METHODS: We prospectively evaluated 14 patients between 2003 and 2008, taking into consideration the topography of the fracture, trauma mechanism, associated comorbidities and AOFAS score for the forefoot. RESULTS: The anatomical region most affected was the metatarsal neck (79%). Involvement of multiple metatarsals (53%) was more common than isolated fractures (47%). Low-energy trauma (79%) was more frequent than high-energy trauma (21%). Female patients with diabetes had the worst postoperative functional results. There were no postoperative complications relating to the type of treatment instituted. CONCLUSIONS: The surgical technique presented was efficient for treating fractures of the lesser metatarsals, with a lower complication rate than shown by other established techniques in the literature .
Structural and Enzymatic Characterization of the Phosphotriesterase OPHC2 from Pseudomonas pseudoalcaligenes
Guillaume Gotthard, Julien Hiblot, Daniel Gonzalez, Mikael Elias, Eric Chabriere
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0077995
Abstract: Background Organophosphates (OPs) are neurotoxic compounds for which current methods of elimination are unsatisfactory; thus bio-remediation is considered as a promising alternative. Here we provide the structural and enzymatic characterization of the recently identified enzyme isolated from Pseudomonas pseudoalcaligenes dubbed OPHC2. OPHC2 belongs to the metallo-β-lactamase superfamily and exhibits an unusual thermal resistance and some OP degrading abilities. Principal findings The X-ray structure of OPHC2 has been solved at 2.1 ? resolution. The enzyme is roughly globular exhibiting a αβ/βα topology typical of the metallo-β-lactamase superfamily. Several structural determinants, such as an extended dimerization surface and an intramolecular disulfide bridge, common features in thermostable enzymes, are consistent with its high Tm (97.8°C). Additionally, we provide the enzymatic characterization of OPHC2 against a wide range of OPs, esters and lactones. Significance OPHC2 possesses a broad substrate activity spectrum, since it hydrolyzes various phosphotriesters, esters, and a lactone. Because of its organophosphorus hydrolase activity, and given its intrinsic thermostability, OPHC2 is an interesting candidate for the development of an OPs bio-decontaminant. Its X-ray structure shed light on its active site, and provides key information for the understanding of the substrate binding mode and catalysis.
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