oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 480 )

2018 ( 831 )

2017 ( 811 )

2016 ( 1108 )

Custom range...

Search Results: 1 - 10 of 473740 matches for " Hernández Silva Mónica Lucia "
All listed articles are free for downloading (OA Articles)
Page 1 /473740
Display every page Item
Casos históricos colombianos del registro de anomalías del radón-222 antes de eventos sísmicos de naturaleza tectónica
Serna Valencia Doris Yaneth,Moran Rodríguez Estela Catalina,Garzón Valencia Gustavo,Hernández Silva Mónica Lucia
Earth Sciences Research Journal , 2003,
Abstract: Since 1995 it had been making continuous measurements of the radioactive isotope Radon-222 emissions in soils at Galeras and Nevado del Ruiz volcanoes; and on active geological faults in Nari o, Cauca and Caldas districts. The E-PERM ionizing chamber system has been used in the Radon-222 monitoring, trapping this gas in the B horizont of soils. In zones of active faulting it has been stablished Radon soil emissions between 1000 and 2500 pCi/L. In some crossings of active faults it has been measured levels of25000 pCilL. In the present work appears a compilation of examples of the registered anomalous emissions in several stations before earthquakes of tectonic character. Examples of registered Radon anomalies before: I) events of magnitudes between 2 and 4; 2) the Quindío earthquake of january 1999; and 3) the occurrence of seismic swarms registered by the seismological networks of the Volcanological and Seismological Observatories at Pasto and Manizales, are described. Desde el a o de 1995 se han estado realizando mediciones continuas de las emisiones del isótopo radiactivo Radón-222 en los suelos de los volcanes Galeras y nevado del Ruiz, y sobre fallas activas en los departamentos de Nari o, Cauca y Caldas. En el monitoreo del gas Radón-222 se ha utilizado el sistema de medición de cámaras ionizantes E-PERM, atrapando los gases en el horizonte B de los suelos. Se ha encontrado que en zonas de fallamiento activo las emisiones de este gas están entre los 1000 Y2500 pCi/L. En algunos cruces de fallas activas se han medido niveles hasta de 25000 pCi/L. En el presente trabajo se presenta una compilación de ejemplos de las emisiones anómalas registradas en varias estaciones antes de sismos de carácter tectónico. Se muestran anomalías del Radón registradas antes de: I) eventos de magnitudes entre 2 y 4; 2) el terremoto del Quindío de enero de 1999, y 3) la ocurrencia de enjambres sísmicos registrados por las redes sismológicas de los observatorios vulcanológicos y sismológicos de Pasto y Manizales.
Morbilidad por trastornos del movimiento en la consulta de Neurología Morbidity due to movement disorders in the Neurology Department
Mónica Rodríguez Montalbán,Osiel Gámez Rodríguez,Tania Hernández Silva,Sergio Echavarría Danger
MEDISAN , 2012,
Abstract: Se realizó un estudio observacional, descriptivo y transversal de 175 pacientes con trastornos del movimiento que asistieron a la Consulta de Neurología del Hospital General Docente "Dr. Juan Bruno Zayas Alfonso" desde el 2007 hasta el 2010, con vistas a describir la morbilidad en estos. Dichas afecciones iniciaron durante la quinta y sexta décadas de la vida en la mayoría de los integrantes de la casuística, con una frecuencia superior de la enfermedad de Parkinson, el temblor esencial y las distonías, y prevalencia del sexo masculino y el color de la piel mestizo. La electromiografía de los músculos agonistas y antagonistas evidenció el predominio del temblor de reposo y la disfunción en la inhibición recíproca, sobre todo en la enfermedad de Parkinson. An observational, descriptive and cross-sectional study of 175 patients with movement disorders who attended the Neurology Department in "Dr. Juan Bruno Zayas Alfonso" Teaching General Hospital was carried out from 2007 to 2010, aimed at describing the morbidity in them. These disorders began during the fifth and sixth decades of life in most of the members of the case material, with a higher frequency of Parkinson disease, the essential tremor and dystonias, and prevalence of the male sex and half-bred skin. The electromyography of the agonistic and antagonistic muscles evidenced the prevalence of the rest tremor and the disorder in the reciprocal inhibition, mainly in the Parkinson disease.
Efecto del virus del síndrome reproductivo y respiratorio porcino (PRRS) en células dendríticas de cerdo derivadas de monocitos
Flores-Mendoza, Lilian;Silva-Campa, Erika;Reséndiz, Mónica;Mata-Haro, Verónica;Osorio, Fernando A.;Hernández, Jesús;
Veterinaria México , 2009,
Abstract: dendritic cells (dc) are considered the most important antigen presenting cells of the immune system. its anatomical location (skin, mucosa and peripheral blood), the expression of receptors to recognize pathogens, the expression of co-stimulatory molecules (cd80/86), the major histocompatibility complex (mhc) class i and ii, and the production of cytokines (such as ifn-α, il-10, il-12) confers to these cells the characteristic to regulate innate and adaptive immune responses. the objective of this work was to evaluate the effects of the porcine reproductive and respiratory virus (prrs) in mature dc. dc were generated from blood monocytes using il-4 and gm-csf and were stimulated with lipopolysaccharide (lps) to induce their maturation. the results show that the expression of cd14 and cd172a molecules in infected dc was not affected, while mhc ii and cd80/86 expression was diminished. this decrease seems to affect the allogenic proliferation of lymphocytes stimulated with infected dc. on the other hand, the virus increases mrna expression of il-10 and tnf-α, and diminishes that for il-1 β and il-6. the results obtained could explain, in part, the immunophatology of the disease.
Corrosion of Steel Pipelines Transporting Hydrocarbon Condensed Products, Obtained from a High Pressure Separator System: A Failure Analysis Study  [PDF]
Gerardo Zavala Olivares, Mónica Jazmín Hernández Gayosso
Materials Sciences and Applications (MSA) , 2015, DOI: 10.4236/msa.2015.68078
Abstract: In this paper, the corrosion of steel pipelines transporting hydrocarbon condensed products was studied. Different activities of sampling and analysis were carried out to diagnose the failure causes and to establish a control system for the corrosion problem. The combination of three types of corrosion, including erosion corrosion, galvanic corrosion and microbiologically induced corrosion, was synthetically considered. A serial of experiments were designed to research those types of corrosion. This type of failure was observed in characteristics sites of the pipeline, mainly in direction changes and welding joints. Additionally, localized corrosion was observed in the inner steel wall and distributed along the pipeline, although a tendency was not detected.
Morbilidad por trastornos del movimiento en la consulta de Neurología
Rodríguez Montalbán,Mónica; Gámez Rodríguez,Osiel; Hernández Silva,Tania; Echavarría Danger,Sergio; Bizet Altes,Omar;
MEDISAN , 2012,
Abstract: an observational, descriptive and cross-sectional study of 175 patients with movement disorders who attended the neurology department in "dr. juan bruno zayas alfonso" teaching general hospital was carried out from 2007 to 2010, aimed at describing the morbidity in them. these disorders began during the fifth and sixth decades of life in most of the members of the case material, with a higher frequency of parkinson disease, the essential tremor and dystonias, and prevalence of the male sex and half-bred skin. the electromyography of the agonistic and antagonistic muscles evidenced the prevalence of the rest tremor and the disorder in the reciprocal inhibition, mainly in the parkinson disease.
Estudio químico y evaluación de la actividad antifouling del octocoral caribe?o Eunicea laciniata
Silva, Carmen Tatiana Cuadrado;Hernández, Leonardo Castellanos;Reyes, Oscar Eduardo Osorno;Rodríguez, Freddy Alejandro Ramos;Beltrán, Carmenza Duque;Hegedus, Mónica Puyana;
Química Nova , 2010, DOI: 10.1590/S0100-40422010000300033
Abstract: the bioassay guided purification of the octocoral eunicea laciniata organic extract, collected at santa marta bay, colombia, allowed the isolation of the new compound (-)-3β-pregna-5,20-dienyl-β-d-arabinopyranoside (1), along with the known compounds 1(s*),11(r*)-dolabell-3(e),7(e),12(18)-triene (2), 13-keto-1(s),11(r)-dolabell-3(e ),7(e),12(18)-triene (3), cholest- 5,22-dien-3β-ol (4), cholesterol (5), y brassicasterol (6). the structure and absolute configuration of 1 was determined on based spectroscopic analyses (nmr and cd). the extract showed antifouling activity against five strains of marine bacteria associated to heavy fouled surfaces. also showed activity against the cypris of the cosmopolitan barnacle balanus amphitrite, and low toxicity in artemia salina test.
CóMO VALORA EL MERCADO DE VALORES ESPA OL LA ADOPCIóN DE PLANES DE OPCIONES SOBRE ACCIONES PARA DIRECTIVOS Y CONSEJEROS?
Mónica Melle Hernández
Investigaciones Económicas , 2005,
Abstract: Este artículo analiza las reacciones del mercado de capitales espa ol ante la adopción de planes de opciones sobre acciones para directivos y consejeros entre el 1 de septiembre de 1998 y el 31 de julio de 2003, bajo las hipótesis semifuerte de eficiencia del mercado y del contenido informativo de estos sistemas retributivos. El mercado valora favorablemente la formalización de los acuerdos y su comunicación oficial; el precio de ejercicio y los periodos de carencia y de ejercicio de las opciones determinan las rentabilidades anormales positivas. A medio plazo, existe una relación negativa entre la adopción de estos planes y los retornos de los títulos
Steel Pitting Corrosion Analysis, Using a High Vaccum Epoxy Penetration Technique  [PDF]
Gerardo Zavala Olivares, Mónica J. Hernández Gayosso, Rafael García Esquivel
Materials Sciences and Applications (MSA) , 2013, DOI: 10.4236/msa.2013.41002
Abstract:

An epoxy penetration technique was used to reproduce and analyze the pitting corrosion process occurred at a steel coupon surface. The samples were exposed to the resin under high vacuum conditions, in order to fulfill the pits caused by the corrosion process. With this technique, a 3D image of the corrosion damages was obtained. Once the image of the damaged surface was obtained, a Scanning Electron Microscope (SEM) was used to analyze the morphology of the pits exhibited by the steel sample. The results were satisfactory, as different parameters such as the diameter, shape and depth of the pits originated, along with the corrosion preferential path, could be established. According to the results, the use of the epoxy penetration technique may be considered as alternating pitting corrosion analysis technique.

Formas de territorialidad espa?ola en la Gobernación del Chocó durante el siglo XVIII
Hernández Ospina,Mónica Patricia;
Historia Crítica , 2006,
Abstract: the article explores the nuances of spanish territoriality in chocó during the eighteenth century. to do this, it examines the spanish practices appropriating space, stressing those aspects that permitted there to be variations within that territoriality. the article first considers the different ways chocó has been dealt with in the colonial historiography by referring to the most important historical studies that address the region. then, based on spanish practices of territoriality, it develops the argument that despite some traits that point to chocó as a frontier territory, there were also other forms of spanish territoriality in the region that qualify this character.
Control of inventories under non-convex polynomial cost functions
HERNáNDEZ FLóREZ,MóNICA;
Revista Colombiana de Matemáticas , 2007,
Abstract: i propose an alternative method for computing effectively the solution of the control inventory problem under non-convex polynomial cost functions. i apply the method of moments in global optimization to transform the corresponding, non-convex dynamic programming problem into an equivalent optimal control problem with linear and convex structure. i device computational tools based on convex optimization, to solve the convex formulation of the original problem.
Page 1 /473740
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.