Papers by Angel david Flores ramos
IEEE Transactions on Microwave Theory and Techniques, 2016
Anales De La Real Academia De Medicina Y Cirugia De Valladolid, 2013
El diafragma es una estructura músculo-aponeurótica delgada y aplanada que separa la cavidad torá... more El diafragma es una estructura músculo-aponeurótica delgada y aplanada que separa la cavidad torácica de la abdominal. La hernia diafragmática traumática es una lesión poco frecuente y potencialmente mortal que puede presentarse en pacientes que han sufrido un traumatismo tóraco-abdominal tanto cerrado como penetrante. La ruptura diafragmática es un importante indicador de la gravedad del traumatismo. Suelen identificarse en el momento del traumatismo, pero en ocasiones pueden pasar desapercibidas y diagnosticarse meses, e incluso años, más tarde debido a la presencia de síntomas relacionados con las estructuras y órganos afectados. Si no se detecta a tiempo, la tasa de mortalidad puede aumentar debido a la aparición de graves complicaciones. El diagnóstico de la hernia diafragmática traumática es difícil y, a menudo, puede pasar desapercibido debido a la gravedad de las lesiones acompañantes. La radiografía de tórax en decúbito supino, a pesar de sus limitaciones, es el método de imagen más habitual y el más frecuentemente utilizado para evaluar los traumatismos torácicos. Sin embargo, la tomografía computarizada (TAC) es actualmente la exploración idónea y el principal método diagnóstico de las hernias diafragmáticas traumáticas. En pacientes hemodinámicamente estables la videolaparoscopia y la videotoracoscopia permiten el diagnóstico y en muchos casos el tratamiento de la lesión diafragmática. En la mayoría de los casos la sutura de los bordes de la herida diafragmática es suficiente para corregir la lesión. En los grandes defectos diafragmáticos puede ser necesario el uso de prótesis.
Bulletin of Mathematical Biology, 2015
Ebola virus disease is a lethal human and primate disease that currently requires a particular at... more Ebola virus disease is a lethal human and primate disease that currently requires a particular attention from the international health authorities due to important outbreaks in some Western African countries and possible spread to other continents, which has already occurred in the USA and Spain. Regarding the emergency of this situation, there is a need of development of decision tools to assist the authorities to focus their efforts in important factors to eradicate Ebola. In particular, mathematical modelling can help to predict the possible evolution of the Ebola outbreaks and to give some recommendations about surveillance. In this work, we propose a novel spatial and temporal model, called Be-CoDiS (Between-COuntries Disease Spread), to study the evolution of human diseases between countries. The goal is to simulate the spread of a particular disease and identify risk zones worldwide. The main interesting characteristics of Be-CoDiS are the consideration of the migratory flux between countries and control measure effects and the use of time dependent coefficients adapted to each country. First, we focus on the mathematical formulation of each component of the model. Next, in order to validate our approach, we consider various numerical experiments regarding the 2014 Ebola epidemic. In particular, we study the ability of the model in predicting the EVD evolution at 30 days and until the end of the epidemic. The results are compared to real data and other models outputs found in the literature. Finally, a brief parameter sensitivity analysis is done.
Video of the forecast done in April, 25 2015 of the Oleg Naydenov Oil Spill up to May 1, 2015. Co... more Video of the forecast done in April, 25 2015 of the Oleg Naydenov Oil Spill up to May 1, 2015. Colormap is amplified to see all affected areas.
Lecture Notes in Computer Science, 2006
In this paper, we describe how PUMAS, a framework based on Ubiquitous Agents for accessing Web In... more In this paper, we describe how PUMAS, a framework based on Ubiquitous Agents for accessing Web Information Systems (WIS) through Mobile Devices (MD) can help to provide nomadic users with relevant and adapted information. Using PUMAS, the information delivered to a nomadic user (whose location changes) is adapted according to, on the one hand, her/his preferences, intentions and history in the system and, on the other hand, the limited capacities of her/his MD. We describe the extension we propose for handling adaptation in PUMAS. We also describe different scenarios which illustrate the way PUMAS works, especially when a query is processed.
Archivos de Bronconeumología, 2015
2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS), 2014
This paper presents a permittivity sensor based on chipless time-coded UWB RFID tags. These tags ... more This paper presents a permittivity sensor based on chipless time-coded UWB RFID tags. These tags consist of a UWB antenna connected to a microstrip delay line. The principle of operation is based on the change in the delay between structural and antenna modes in the time response of the tags, as a function of the material where they are attached. A linear behavior is observed between delay and permittivity, with up to 350 ps delay increase for a permittivity variation between 2.2 and 5.7.
Journal of the Chemical Society, Perkin Transactions 1, 1994
... Manuel Medarde," Angel C. Ramos, Rafael Pelaez-Lamamie de Clairac, Esther Caballero ... more ... Manuel Medarde," Angel C. Ramos, Rafael Pelaez-Lamamie de Clairac, Esther Caballero andArturo San Feliciano Departamento de Quimica Organica, Facultad de ... Tomioka, T. Ishiguro and K. Koga, Tetrahedron Lett., 1980, 21, 2973; (e) P. Collins, A. Pelter, R. S. Ward and P ...
ChemInform, 2010
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform, 2010
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Veterinary Microbiology, 2012
A new, recently published, stochastic and spatial model for the evaluation of classical swine fev... more A new, recently published, stochastic and spatial model for the evaluation of classical swine fever virus (CSFV) spread into Spain has been validated by using several methods. Internal validity, sensitivity analysis, validation using historical data, comparison with other models and experiments on data validity were used to evaluate the overall reliability and robustness of the model. More than 100 modifications in input data and parameters were evaluated. Outputs were obtained after 1000 iterations for each new scenario of the model. As a result, the model was shown to be robust, being the probability of infection by local spread, the time from infectious to clinical signs state, the probability of detection based on clinical signs at day t after detection of the index case outside the control and surveillance zones and the maximum number of farms to be depopulated at day t the parameters that more influence (>10% of change) on the magnitude and duration of the epidemic. The combination of a within-and between-farm spread model was also shown to give significantly different results than using a purely between-farm spread model. Methods and results presented here were intended to be useful to better understand and apply the model, to identify key parameters for which it will be critical to have good estimates and to provide better support for prevention and control of future CSFV outbreaks.
Tetrahedron Letters, 1996
... All rights reserved 00404039 96 15.00 + 0.00 A New Approach to the Synthesis of Podophyllotox... more ... All rights reserved 00404039 96 15.00 + 0.00 A New Approach to the Synthesis of Podophyllotoxin Based on Epimerization Reactions Manuel Medarde*, Angel C. Ramos, Esther Caballero, Jose Luis Lfpez, Rafael ... Takeya, T.; Akabane, Y.; Kotani, E. and Tobinaga, S. Chem. ...
Tetrahedron Letters, 1998
A new family of thienolignanolides has been synthesized by means of conjugate addition-alkylation... more A new family of thienolignanolides has been synthesized by means of conjugate addition-alkylation of 5H-furan-2-one, followed by cyclization and controlled epimerizations. The applicability of this versatile methodology is extended to the preparation of heteroaromatic analogues of biologically relevant cyclolignanolides.
Optimization and Engineering, 2013
In this article, we focus on the design of code division multiple access filters (used in data tr... more In this article, we focus on the design of code division multiple access filters (used in data transmission) composed of a particular optical fiber called sampled fiber Bragg grating (SFBG). More precisely, we consider an inverse problem that consists in determining the effective refractive index profile of an SFBG that produces a given reflected spectrum. In order to solve this problem, we use an original multilayers semi-deterministic global optimization method based on the search of suitable initial conditions for a given optimization algorithm. The results obtained with our optimization algorithms are compared, in term of complexity and final design, with those given by an hybrid genetic algorithm (the method generally considered in the literature for designing SFBGs).
Journal of Global Optimization, 2007
This paper focuses on the application of an original global optimization algorithm, based on the ... more This paper focuses on the application of an original global optimization algorithm, based on the hybridization between a genetic algorithm and a semi-deterministic algorithm, for the resolution of various constrained optimization problems for realistic credit portfolios. Results are analyzed from a financial point of view in order to confirm their relevance.
Journal of Food Engineering, 2007
Innovative Food Science & Emerging Technologies, 2005
This work aimed the induction of crystallization on powder mango juice during the process of spra... more This work aimed the induction of crystallization on powder mango juice during the process of spray drying and the correlation of the microstructure of the powder obtained with the functional properties of stickiness and solubility. To perform this work, we used mango juice with 12-Brix. Before being dehydrated, the juice undertook addition from the following carriers: maltodextrin, gum arabic and starch waxy in the concentration of 12%. The solution also received addition of crystalline cellulose in the concentrations of 0, 3, 6 and 9%. The powder was obtained through the use of a mini-spray dryer of laboratorial scale. Analyses of microstructure, stickiness, hygroscopicity and solubility were performed on the obtained powder. The microstructure analyses showed that the powders of the mango juices obtained through spray drying using the carriers maltodextrin, gum arabic, starch waxy without the addition of cellulose presented surfaces of amorphous particles. The analysis XRD showed that when 3, 6 and 9% of cellulose were added, the particles showed half-crystalline surfaces. The value of stickiness decreased in terms of the concentration of cellulose reaching values of 0.15, 0.22 and 0.11 Kg-f for maltodextrin, gum arabic and starch waxy, respectively. The functional property of solubility is affected when 9% of cellulose is added reaching the values of 72, 71 and 31% for the carriers maltodextrin, gum arabic and starch wax, respectively.
Revista de la Real Academia de …, 1995
The approximate controllability of solutions of a large class of semilinear parabolic problems is... more The approximate controllability of solutions of a large class of semilinear parabolic problems is studied. We extend previous results in the literature under a sublinear asymptotic condition on the nonlinearities. On the other hand, we show that this property fails for strictly superlinear nonlinearities. Resumen En este trabajo se estudia la controlabilidad aproximada de una amplia clase de problemas semilineales parabólicos. En una primera parte se muestra esta propiedad bajo una hipótesis de comportamiento asintótico sublineal sobre las no linealidades extendiendo resultados conocidos en la Hteratura. En una segunda parte se muestra que la propiedad no se verifica si los términos no lineales son estrictamente superlineales. * We say that v is of "quasi bang-bang type" if there exist a constant C and a function (¡9() such that v() € C sig (p{)
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Papers by Angel david Flores ramos