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Search Results: 1 - 10 of 16384 matches for " Raquel Garcia "
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Gastroduodenal Artery Reconstruction as Salvage Procedure for Pancreas Head Ischemia during Transplantation: A Case Report  [PDF]
Raquel Garcia-Roca, Emiliano Astudillo Pombo
Open Journal of Organ Transplant Surgery (OJOTS) , 2012, DOI: 10.4236/ojots.2012.24007
Abstract: Vascularization of the pancreatic allograft depends on the mesenteric and celiac arteries. During procurement inadvertent sectioning of the branches to the head of the pancreas can lead to ischemia and generally there is a need to remove the graft during the same transplant procedure. Knowledge of several unconventional revascularization techniques in the back table and other salvage procedures after reperfusion can be useful in deciding the fate of the graft once ischemia is established immediately after engraftment. We present a case of revascularization of the gastroduodenal artery after reperfusion of the pancreas to improve blood flow to the head of the pancreas that was ischemia after restoring circulation.
Application of Molecularly Imprinted Polymers for the Analysis of Pesticide Residues in Food—A Highly Selective and Innovative Approach  [PDF]
Raquel Garcia, Maria Jo?o Cabrita, Ana Maria Costa Freitas
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.228119
Abstract: The increasing application of pesticides for agricultural purposes involves serious risk to the environment and human health due to either exposure or through residues in food and drinking water. Since food safety is of mandatory importance there is a growing interest on the development of selective, simple, rapid, cost-effective and reliable analytical methodologies in order to ensure that pesticides residues should not be found at levels above the established maximum pesticide residue limits (MRLs). In recent years, a new methodology based on the development of molecularly imprinting polymers (MIPs) allows not only pre-concentration and cleaning of the sample but also selective extraction of the target analyte, which is crucial, particularly when the sample is complex and impurities can interfere with quantification. The scope of this review is to provide a general overview on MIPs field, with emphasis on MIP preparation and its use as sorbents for solid-phase extraction. This paper will be focused on the review of the current state of the art in the use of MIPs as selective materials in molecularly imprinted solid-phase extraction (MISPE) for the analysis of pesticide residues from food matrices. A review of preparation and application of MIPs in food matrices, will also be discussed.
Acute Appendicitis Confined to an Incisional Hernia Following Renal Transplantation  [PDF]
Shanel Bhagwandin, Raquel Garcia-Roca, Hoonbae Jeon
Open Journal of Organ Transplant Surgery (OJOTS) , 2013, DOI: 10.4236/ojots.2013.33010
Abstract: We present a case of a 57 years old moderately obese woman with a known 12 cmincisional hernia, who subsequently developed an incarcerated acute appendicitis. The patient underwent an uneventful orthotopic liver and renal transplant five years prior, and was compliant with ongoing immunosuppression without rejection. She presented with 8 hours of acute onset right lower quadrant pain, associated with anorexia, documented fevers, and nausea. Noncontrast CT demonstrated a blind-ending tubular structure with an enhancing and thickened wall within a hernia defect of the right lower quadrant. The patient underwent emergent laparotomy and a non-perforated appendix was completely excised at its base. Discussion: There have been documented reports of an acute appendicitis associated with inguinal hernias, given the eponym Amyand’s hernia. Appendicitis may present within hernias, and there should be a low threshold for radiologic assessment of its components when there is clinical doubt about the symptoms associated with the hernia. Our recommendation prompts early use of non-contrast CT scan in transplant patients with known hernias on examination and abdominal tenderness over the renal allograft considering the high risk of perforation of acute appendicitis and strangulation.

 

Flexible Co-Combustion of High Ratios of Sustainable Biomass with Coal in Oxy-CFB Boiler for CO2 Capture  [PDF]
Jose A. Gutiérrez Bravo, Raquel Garcia, Erasmo Cadena
Journal of Power and Energy Engineering (JPEE) , 2018, DOI: 10.4236/jpee.2018.611002
Abstract: Coal-fired plants are under pressure to reduce their carbon-intensity. Available options include co-firing CO2-neutral biomass, oxy-fuel-combustion as part of a carbon capture process or a combination of both to give a “CO2-negative” power plant. BioCCS, the combination of CO2 Capture and Storage (CCS) with sustainable biomass conversion, is the only large-scale technology that can achieve net negative emissions. Combining, developing and demonstrating the oxy-combustion of high ratios of sustainable biomass with coal in flexible circulating fluidized bed (CFB) boiler will bring significant advances in the reduction of greenhouse gases (GHG) emissions. Areas addressed include possibilities for: biomass characterization; handling and feeding; co-firing ratios definition; CFB oxy-co-combustion studies; combustion performance; boiler flexibility in fuel and load; main emissions analysis; slaging, fouling and agglomeration; corrosion and erosion; and implications on plant operation and associated costs. The article will detail a comprehensive understanding on sustainable biomass supply, co-firing ratios and how direct biomass co-combustion under oxy-fuel conditions can be implemented. It seeks to push biomass co-combustion in future large-scale oxy-fuel CFB power stations to high thermal shares while enhancing the power plants’ operational flexibility, economic competitiveness and give operational procedures. There will be a need to consider the public acceptance of power production from coal and coal sustainability, by its combination with renewable sources of energy (biomass).
Coalbed Methane Potential in the Basin Guardo-Barruelo (North Spain)  [PDF]
Jose A. Gutierrez Bravo, Raquel Garcia, Erasmo Cadena
Journal of Power and Energy Engineering (JPEE) , 2019, DOI: 10.4236/jpee.2019.71001
Abstract: Coal during its carbonization process produces a gas, which, mainly formed by methane, can be used. The use of CBM (Coal bed methane) as an energetic resource is not much known in Spain. This work is the first step to enhance the development of this resource in Castilla y León Guardo-Barruelo basin. A review of the state of the art is introduced, taking into account all the factors that can influence in the development of a CBM project. Then CBM resources have been quantified for Guardo-Barruelo basin accurately for every coal bed. After that, technical feasibility has been used to evaluate total amount of gas that can be recovered.
O desafio da efetiva o do direito à cidade nas metrópoles
Natalia Cardoso Marra,Raquel Garcia Gon?alves
Revista Tecer , 2011,
Abstract: Todos têm direito à cidade, mas, contraditoriamente, o acesso a esse direito n o é disponibilizado de forma igualitária. A gest o urbana das metrópoles deve se dar de maneira intersetorializada, conectada com os fatores de forma o do espa o urbano, contudo n o é dessa maneira que as cidades s o organizadas. O déficit habitacional no Brasil demonstra o descaso dos administradores públicos frente a um fator essencial para a forma o do espa o urbano e para a vida. Esse trabalho visa demonstrar através de um estudo da ineficiente efetiva o do direito social à moradia como é falha a gest o das metrópoles, apontando as possibilidades e os desafios da participa o popular como instrumento de acesso à cidade
Canarias: entre el desarrollo turístico y la protección al medio
Tanausú Perez Garcia,Raquel Guerra?Talavera
études Caribeénnes , 2010, DOI: 10.4000/etudescaribeennes.1302
Abstract: Les les Canaries, situées dans la région de la ‘Macaronésica’ (l’Est de l’Océan Atlantique), abritent des écosystèmes marins et terrestres très précieux, tant du point de vue écologique que paysager. Ils sont représentatifs de les zones biogéographiques de sa région et comptent trois Réserves da Biosphère reconnues par l’UNESCO. De grands scientifiques comme Alexander Von Humboldt et Charles Darwin ont fait l’éloge de la richesse de la biodiversité de cet archipel. Cependant, actuellement, la pression anthropique, notamment en liaison avec le développement touristique et tous les enjeux économiques qui l’accompagnent, mettent en danger les écosystèmes des Canaries ; ce constat a ouvert un large débat sur les enjeux autour des développements économique et touristiques et leurs dérives. Notre article propose de mettre l’accent sur les caractéristiques des les Canaries et de replacer les processus de développements touristiques dans leur contexte pour ouvrir la réflexion sur les conditions nécessaires pour d’un développement durable. The Canary Islands, located in the region of 'Macaronésica' (Este of Atlantic Ocean), are home to marine and terrestrial ecosystems very valuable, both ecological and landscape. They are representative of the bio-geographic zones of the region and there are three Biosphere Reserves da recognized by UNESCO. Great scientists such as Alexander Von Humboldt and Charles Darwin have praised the richness of the biodiversity of this archipelago. However, at present, anthropogenic pressure, including in relation to tourism development and all economic issues that accompany it, endanger ecosystems Canary Islands. This has opened a broad debate on the issues surrounding economic development and tourism and their excesses. Our article proposes to focus on the characteristics of the Canary Islands and put the process of tourist developments in their context to open reflection on the necessary conditions for sustainable development. Las Islas Canarias, situadas en la región macaronésica, acogen ecosistemas terrestres y marinos de valiosa riqueza ecológica y paisajística, representativos de las áreas culturales y biogeográficas de su entorno; hasta el punto de albergar tres Reservas de la Biosfera reconocidas por la UNESCO. La diversidad y riqueza de este marco insular ya fue elogiada por grandes científicos como Alexander von Humboldt o Charles Darwin. Sin embargo, actualmente la presión ejercida sobre el medio por parte del desarrollo urbanístico y la industria turística, motor económico del archipiélago, pone en peligro estos frágile
Robust Transmission Network Expansion Planning in Energy Systems: Improving Computational Performance
Roberto Minguez,Raquel Garcia-Bertrand
Computer Science , 2015, DOI: 10.1016/j.ejor.2015.06.068
Abstract: In recent advances in solving the problem of transmission network expansion planning, the use of robust optimization techniques has been put forward, as an alternative to stochastic mathematical programming methods, to make the problem tractable in realistic systems. Different sources of uncertainty have been considered, mainly related to the capacity and availability of generation facilities and demand, and making use of adaptive robust optimization models. The mathematical formulations for these models give rise to three-level mixed-integer optimization problems, which are solved using different strategies. Although it is true that these robust methods are more efficient than their stochastic counterparts, it is also correct that solution times for mixed-integer linear programming problems increase exponentially with respect to the size of the problem. Because of this, practitioners and system operators need to use computationally efficient methods when solving this type of problem. In this paper the issue of improving computational performance by taking different features from existing algorithms is addressed. In particular, we replace the lower-level problem with a dual one, and solve the resulting bi-level problem using a primal cutting plane algorithm within a decomposition scheme. By using this alternative and simple approach, the computing time for solving transmission expansion planning problems has been reduced drastically. Numerical results in an illustrative example, the IEEE-24 and IEEE 118-bus test systems demonstrate that the algorithm is superior in terms of computational performance with respect to existing methods.
Uma modalidade peculiar de privatiza??o da educa??o pública: a aquisi??o de "sistemas de ensino" por municípios paulistas
Adri?o, Theresa;Garcia, Teise;Borghi, Raquel;Arelaro, Lisete;
Educa??o & Sociedade , 2009, DOI: 10.1590/S0101-73302009000300009
Abstract: this paper discusses the growing tendency of partnership, through contracts, between cities of the state of s?o paulo and private educational companies, which sells them "education systems". data refer to a research developed under the "research strategies for the municipal provision of basic education: an analysis of public-private partnerships in the state of s?o paulo", funded by fapesp. between 1990 and 2007, we note a marked expansion of this kind of relationship in cities with less than 50.000 inhabitants. this confirms the hypothesis of their dependence on the private sector. they have widened their responsibilities to supply and maintain basic education, but have not organized their local management technically and politically.
As parcerias entre prefeituras paulistas e o setor privado na política educacional: express?o de simbiose?
Adri?o, Theresa;Garcia, Teise;Borghi, Raquel;Arelaro, Lisete;
Educa??o & Sociedade , 2012, DOI: 10.1590/S0101-73302012000200011
Abstract: the paper presents final results of an interinstitutional research that aimed analyses the nature and the consequences of partnerships between private sectors and local governments in the state of s?o paulo to face childhood and fundamental education demands. the studied period was 1996 to 2006, due the perception that the municipalization process could stimulate the outsourcing and privatization of local education. the study presents the ways of partnership: public subvention to offer places in private institutions of childhood education, buy private educational "systems" and private consultancy to education local administration. the tendencies that emerge from the analysis show that the current relationships between the public and private sectors represent a movement towards the privatization.
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