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Search Results: 1 - 10 of 470445 matches for " Jose A. Gutierrez Bravo "
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CCS Membrane Development at CIUDEN’s Technology Development Centre for CO2 Capture  [PDF]
Jose A. Gutierrez Bravo
Journal of Power and Energy Engineering (JPEE) , 2018, DOI: 10.4236/jpee.2018.612001
Abstract: CO2 concentration to the atmosphere has risen faster than ever in the last century. This is highly due to fossil fuel combustion which is the major anthropogenic CO2 source. Membrane technology is an important alternative for reliability, flexibility and economically competitiveness for Carbon Capture and Storage (CCS) processes. The use of membranes has applicability to CCS technologies mainly for CO2, O2 or H2 separation, although most of the membrane studies for CO2/O2 production have been carried out at laboratory scale and will require a step further for commercial scale. This paper will present current membranes R & D needs when applied to CCS systems and CIUDEN capabilities for membrane technological development and testing under real conditions. It covers from O2 separation membrane integration in the process, and applied to the oxy-combustion CO2 capture, to post-combustion technologies for membrane CO2 separation, tested under real conditions or H2 production catalytic-membranes through gasification. At CIUDEN CCS facility important membrane evaluations can be carried out for the module integration, testing of materials performance and behavior under real conditions.
Project for Residues Valorisation and Reutilization from an Oxy-Combustion Circulating Fluidized Bed Boiler with CO2 Capture  [PDF]
Jose A. Gutierrez Bravo, Raquel García
Journal of Power and Energy Engineering (JPEE) , 2019, DOI: 10.4236/jpee.2019.71002
Abstract: Power generation industry has tackled waste reuse and valorisation for decades. Nevertheless, new technologies, like Circulating fluidized bed (CFB) boilers operating in oxy-combustion, have an important gap of knowledge in residues characterization and valorisation. This project will tackle this. Furthermore, as a result of the high quantity of waste that these installations generate new business models can be opened. The project aims at characterizing the residues from a large scale oxy-CFB facility with carbon, capture, use and storage (CCUS) focusing on the larger and main residues produced: fly ash, bottom ash, and algae production from captured CO2. An analysis of possible uses and treatment needs, such as additives or preparation for use in agriculture or industry, will be carried out. Best re-utilization and valorisation options will be stated for fly ash, bottom ash and algae, aiming for a novel combination of CO2 capture technologies with recovery of valuable materials from different wastes, addressing different and sustainable solutions for their reuse, enhancing the feasibility of CCUS, and combining research with the creation of new business models towards a green economy more attractive to the public perception.
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.
Endoscopic submucosal dissection in dogs in a World Gastroenterology Organisation training center
Miguel A Tanimoto, Gonzalo Torres-Villalobos, Rikiya Fujita, Patricio Santillan-Doherty, Jorge Albores-Saavedra, German Gutierrez, Luis A Martin-del-Campo, Carlos Bravo-Reyna, Octavio Villanueva, Jose J Villalobos, Misael Uribe, Miguel A Valdovinos
World Journal of Gastroenterology , 2010,
Abstract: AIM: To evaluate if canine models are appropriate for teaching endoscopy fellows the techniques of endoscopic submucosal dissection (ESD).METHODS: ESD was performed in 10 canine models under general anesthesia, on artificial lesions of the esophagus or stomach marked with coagulation points. After ESD, each canine model was euthanized and surgical resection of the esophagus or stomach was carried out according to “The Principles of Humane Experimental Technique, Russel and Burch”. The ESD specimens were fixed with needles on cork submerged in a formol solution with the esophagus or stomach, and delivered to the pathology department to be analyzed.RESULTS: ESD was completed without complications using the Hook-knife in five esophageal areas, with a procedural duration of 124 ± 19 min, a length of 27.4 ± 2.6 mm and a width of 21 ± 2.4 mm. ESD was also completed without complications using the IT-knife2 in five gastric areas, with a procedural duration of 92.6 ± 19 min, a length of 32 ± 2.5 mm and a width of 18 ± 3.7 mm.CONCLUSION: ESD is feasible in the normal esophagus and stomach of canine models, which are appropriate for teaching this technique.
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).
Bypass gástrico por laparoscopia para la obesidad mórbida: Técnica y resultados en 150 pacientes con seguimiento de 3 a 48 meses
Jose L Leyba,Jose Isaac,Salvador Navarrete A,Carlos Bravo
Revista de la Facultad de Medicina , 2007,
Abstract: Se presenta una serie prospectiva de 150 pacientes sometidos a bypass gástrico por laparoscopia debido a obesidad mórbida. En 98 mujeres y 52 hombres con índice de masa corporal promedio de 43,3 kg/m2 se realizó un bypass gástrico en "Y" de Roux antecólico, con dos técnicas de anastomosis gastroyeyunal. La morbilidad temprana (< 1 mes) fue de 5,3 % representada principalmente por hemorragia intraabdominal, mientras que la tardía (> 1 mes) fue de 13,8 %, debida en la mayoría de los casos a estenosis de la gastroyeyunoanastomosis. No hubo mortalidad en la serie. Con un seguimiento del 70 %, encontramos pérdidas de exceso de peso del 84 % al a o de posoperatorio (valor promedio), con mejoría de comorbilidades de 92,5 % en hipertensión arterial y 59,9 % en diabetes. Se concluye que la técnica de bypass gástrico por laparoscopia, representa una alternativa factible, segura y efectiva para los pacientes con obesidad mórbida. A prospective series of 150 patients submitted to laparoscopic gastric bypass for morbid obesity is presented. In 92 women and 58 men with a median body mass index of 43.3 kg/m2 an antecolic Roux en Y gastric bypass was performed using two techniques of gastrojejunostomy. The early morbidity (< 1 month) was of 5.3 % mainly represented by intraabdominal bleeding, while the late morbidity (> 1 month) was of 13.8 %, and in most cases due to stenosis of the gastrojejunal anastomosis. No mortality occurred in the series. With a 70 % follow up, we found an excess weight loss of 84 % at first postoperative year (mean value), with co-morbidities improvement of 92.5 % on hypertension and 59.9 % on diabetes. We concluded that the technique of laparoscopic gastric bypass is a feasible, safe, and effective alternative for patients with morbid obesity.
Complex bimatrix variate generalised beta distributions
Jose A. Diaz-Garcia,Ramon Gutierrez-Jaimez
Mathematics , 2009,
Abstract: In this paper, the study of bivariate generalised beta type I and II distributions is extended to the complex matrix variate case, for which the corresponding density functions are found. In addition, for complex bimatrix variate beta type I distributions, several basic properties, including the joint eigenvalue density and the maximum eigenvalue distribution, are studied.
Noncentral bimatrix variate generalised beta distributions
Jose A. Diaz-Garcia,Ramon Gutierrez-Jaimez
Mathematics , 2009,
Abstract: In this paper, we determine the density functions of nonsymmetrised doubly noncentral matrix variate beta type I and II distributions. The nonsymetrised density functions of doubly noncentral and noncentral bimatrix variate generalised beta type I and II distributions are also obtained.
Compound and scale mixture of vector and spherical matrix variate elliptical distributions
Jose A. Diaz-Garcia,R. Gutierrez-Jaimez
Mathematics , 2009,
Abstract: Several matrix variate hypergeometric type distributions are derived. The compound distributions of left-spherical matrix variate elliptical distributions and inverted hypergeometric type distributions with matrix arguments are then proposed. The scale mixture of left-spherical matrix variate elliptical distributions and univariate inverted hypergeometric type distributions is also derived as a particular case of the compound distribution approach.
A note about zonal polynomials
Jose A. Diaz-Garcia,Ramon Gutierrez-Jaimez
Mathematics , 2009,
Abstract: In this paper, we study some properties of multivariate gamma function and zonal polynomials.
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