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LOS PROBLEMAS DE SALUD RELACIONADOS CON EL AGUA DE CONSUMO
Richard J. Coronado,Luz Valero,Elizabeth M. Pérez Pérez
Salud, Arte y Cuidado , 2009,
Abstract: Due the importance of water sources and its ecological and social impact, it was decided to make a diagnosishealth problems related to water of consumption in Llanitos de Tabay, Sector Vista Alegre (Mérida, Venezuela), in orderto establish any relation between health problems presented by the inhabitants of this community and the resourceconsumption water. The study was performed means the application of surveys related to the topics before mentioned to50% of the population of the study sector. In addition, with the aim to relate the data contributed by the communityconcerning to diseases related to the quality of consumption waters, were obteined the morbidity data of year 2007 to theAmbolutorio Rural II de Tabay, which were correlated with the information contributed by the community. In agreementwith the realized surveys, the inhabitants report the existence of public health problems related to consumption water,being most important: amibiasis, diarrheas, escabiosis and parasitism. Secondly, according to morbidity data ofAmbulatory, the diseases reported by the community represent serious public health problems related to the quality ofconsumption water. Finally, according to the inhabitants of the sector in study, the problems related to the water could besolved implementing plans of waters treatment and with a major participation of public organisms
Efecto de la preparación superficial y aplicación de recubrimientos en la resistencia a la fatiga del acero SAE 1045
John J. Coronado
Scientia Et Technica , 2007,
Abstract: En este artículo se estudia el comportamiento a fatiga del acero SAE 1045 usando cuatro condiciones superficiales diferentes: pulido, chorreado con partículas de arena, de alúmina y de acero. Además se aplicaron recubrimientos usando rociado térmico por combustión a probetas chorreadas con arena. Se realizaron pruebas de fatiga en flexión rotatoria y la caracterización de la superficie de fractura usando lupa estereoscópica y microscopio electrónico de barrido. Se encontró un aumento de la resistencia a fatiga de las muestras preparadas con arena (458,58 MPa) y de las muestras preparadas con alúmina (428,36 MPa), respecto a la resistencia de las muestras pulidas (422,00 MPa). La resistencia a fatiga de las muestras preparadas con partículas de acero disminuyó (415,44 MPa), debido a marcas superficiales que actuaron como concentradores de esfuerzos y originaron la propagación de grietas por fatiga. Las probetas revestidas con una aleación Fe-Cr-Ni-C presentaron falla debido a delaminación del recubrimiento y por propagación de fisuras a partir del sustrato.
ANáLISIS MECáNICO Y TRIBOLóGICO DE Los RECUBRIMIENTOS Fe-Cr-Ni-C Y Ni-Al-Mo
MU?OZ,JORGE E.; CORONADO,JOHN J.;
DYNA , 2007,
Abstract: in this paper the coatings ni=89%, al = 5,5%, mo=5,5% and fe=81,8%, cr=16%, ni=2%, c=0,2% were evaluated. the coatings were applied by flame-thermal spray technique. the superficial preparation method was sand blasting. adhesion, shear, abrasive wear, sliding wear and bending tests were made. the coating fe-cr-ni-c presented minor mass loss, as much for abrasive wear as for the sliding wear. the multilayer presented a greater porosity in the base layer (ni-al-mo) than in the outer layer (fe-cr-ni-c), the last one presented greater amount of nonfused particles and oxides. the failure presented in the adhesion test for the samples with multilayer coating was of adhesive and cohesive characteristic. the stress in which the cracks appear by bending moment in the multilayer coatings diminished with the increase of the thickness.
Especies de Eretmocerus Haldeman (Hymenoptera: Aphelinidae) parasitoides de Aleurothrixus floccosus (Maskell) (Homoptera: Aleyrodidae) de México, con la descripción de una nueva especie
S. N. Myartseva,J. M. Coronado Blanco
Acta zoológica mexicana , 2007,
Abstract: Una nueva especie es descrita, Eretmocerus naranjae. Se incluye una clave de las seis especies de Eretmocerus, parasitoides de la mosquita blanca Aleurothrixus floccosus (Maskell) de México, así como la diagnosis, hospederos, distribución y material examinado de cuatro de las especies colectadas.
The influence of water repellent products on the chromatic modifications of the ceramic brick
Coronado Martin, J. A.,Garcia Santos, A.
Materiales de Construccion , 2011,
Abstract: Chromatic variation, colour and luminosity, undergone by the ceramic support protected by the incorporation of a treatment with water repellent products, is analysed. A new methodology is suggested, based on RGB model where quantifiable values from each ceramic sample are obtained through digital measurement of the colour (image histograms), taking as a base the same type of ceramics with no water repellents. Chromatic variation is determined by the type of water repellent and the base material, obtaining the following results: - All the water repellent studied cause variations in the shade and luminosity of the piece. - English red brick (R) is the one presenting less variation of luminosity and shade since it’s been treated with water repellents. - The water repellent of siliconates component is the one which causes less chromatic variation in two of the three bricks studied, the dark brown (T) and the English red (R) one. Se analiza la variación cromática, color y luminosidad, que sufre el soporte cerámico protegido por la incorporación de un tratamiento con productos hidrofugantes. Se propone una metodología nueva, basada en el modelo RGB donde se obtienen valores cuantificables de cada muestra cerámica mediante medición digital del color (histogramas de imagen), tomándose como base el mismo tipo de cerámica sin hidrofugar. La variación cromática está determinada por el tipo de hidrofugante y por el material de base, obteniéndose los siguientes resultados: - Todos los hidrofugantes estudiados producen variación en la tonalidad y luminosidad de la pieza. - El ladrillo rojo ingles (R) es el que presenta menor variación de luminosidad y tonalidad al ser tratado con hidrofugantes. - El hidrofugante de componente siliconatos es el que menor variación cromática produce en dos de los tres ladrillos estudiados, tostado (T) y rojo inglés (R).
Experimental Investigation of an Index-Mismatched Multiphase Flow Using Optical Techniques
H. Coronado Diaz,Ronald J. Hugo
Advances in Optical Technologies , 2013, DOI: 10.1155/2013/487121
Abstract:
Análisis mecánico y tribológico de los recubrimientos fe-cr-ni-c y ni-al-mo
JORGE E. MU?OZ,JOHN J. CORONADO
DYNA , 2007,
Abstract: En este trabajo de investigación se evaluaron dos recubrimientos aplicados por medio de la técnica de rociado térmico por combustión, la aleación: Ni=89%, Al = 5,5%, Mo=5,5% y la aleación Fe=81,8%, Cr=16%, Ni=2%, C=0,2. La preparación superficial de las probetas se realizó usando chorro de arena. Se realizaron pruebas de resistencia al cortante, adherencia, desgaste abrasivo, desgaste por deslizamiento y flexión en cuatro puntos. El recubrimiento Fe-Cr-Ni-C presentó menor pérdida de masa, tanto para desgaste abrasivo como para el desgaste por deslizamiento. La multicapa presentó una mayor porosidad en el recubrimiento Ni-Al- Mo usado como capa base y la capa exterior de Fe-Cr-Ni-C presentó mayor cantidad de partículas no fundidas y óxidos. La falla ocurrida en el ensayo de adherencia para las probetas con recubrimiento multicapa fue de característica adhesiva y cohesiva. El esfuerzo en el que se presenta la fisura por flexión en el recubrimiento multicapa disminuyó con el aumento del espesor
Experimental Investigation of an Index-Mismatched Multiphase Flow Using Optical Techniques
H. Coronado Diaz,Ronald J. Hugo
Advances in Optical Technologies , 2013, DOI: 10.1155/2013/487121
Abstract: An experimental investigation of multiphase flow involving a liquid (water) and a gas (air) is performed. The results for three different scenarios are presented: fixed bubble, ascending bubble, and dispersed-bubble turbulent pipe flow. This study involves a comparison of statistical data collected using two sensing systems, a wavefront sensor and a high-speed video camera. A signal analysis technique based on signal attenuation is developed for data collected using the wavefront sensor. The three experiments performed provide experimental evidence that the Shack-Hartmann wavefront sensor, operating on signal attenuation, is a viable method for the study of multiphase bubble flows. 1. Introduction Multiphase flow is defined as the simultaneous flow of several phases, with the simplest case being two-phase flow. The flow of two phases is found in many industrial processes including chemical and nuclear reactors, distillation towers, pipeline transport, injection of fluids for secondary recovery of oil and geothermal power plants. One form of two-phase flow is gas-liquid dispersed-bubble turbulent pipe flow. This flow is of significant importance in chemical and petroleum process industries where the interfacial area between phases needs to be large for improved process efficiency. Bubble size, velocity of bubbles, and their distribution along the pipe are all important parameters for optimizing the efficiency of processes that rely on dispersed-bubble turbulent pipe flow. Noninvasiveness is a desired attribute in any multiphase flow measurement technique given that the interference between the flow and the measurement device can affect the measured values. Many of the existing multiphase flow measurement techniques rely on the ability of the sensing apparatus to discriminate between certain physical properties that vary between phases, such as electromagnetic radiation attenuation or electrical impedance. A large number of investigations reported over the last fifteen years describe the application of nonintrusive flow sensing techniques applied to the measurement and the study of multiphase fluid flows [1]. Nonintrusive measurement techniques typically provide either integral or line-integrated information, with the most common consisting of capacitance [2], conductance [3], ultrasound [4], and gamma-radiation absorption [5] measurements. Both integral and line-integrated information collected from multiple sensors is often transformed into spatial information through the use of tomographic reconstruction algorithms. The long-term goal of a larger
Morfometría de los Ramos Nerviosos para los Músculos Interóseos Plantares del Pie en el Hombre
Vásquez,Bélgica; del Sol,Mariano; Coronado,J. C;
International Journal of Morphology , 2011, DOI: 10.4067/S0717-95022011000100013
Abstract: innervation of the foot has required special attention in view of its use in clinical and surgical treatment of painful diseases and syndromes such as talalgia, plantar fasciitis and plantar fibromatosis are among those mentioned. studies realized have made possible the functional significance of plantar interossei muscles. however, there is no information regarding greater detail of their innervation. a morphometric study was carried out in 5 nerve branches for the first, second and third plantar interossei muscles in cadavers of adult male individuals. cross sections were obtained of each one of the nerves after their origin, at the deep level of the plantar region of the foot. cuts of4 μm thick were realized which were stained withhematoxylin-eosin (h.e.). average fascicles in the branch for the first interosseous muscle(r1 iop) was 1 (d.e. 0,00); for the second interosseous muscle(r2 iop) was 2 (d.e. 0.45); and for the third interosseous muscle(r3 iop) was 2 (d.e. 1.00). the average of fibers for thel r1 iop, r2 iop was:547 (d.e. 153), 644 (d.e. 258) and 1.161 (d.e. 465) respectively. the average area ofr1 iop, r2 iop y r3 iop was: 0.06 mm2 (d. e. 0.02), 0.08 mm2 (d. e. 0.03), 0.14 mm2 (d. e. 0.06), respectively. the morphometric and stereological study of these nerve branches is expected to contribute to the information available to professionals who must clinically and surgically treat the plantar region of the foot.
Susceptibilidad de larvas y adultos de Boophilus microplus al ixodicida coumafos en explotaciones lecheras del estado Lara, Venezuela
Bravo,Maribel J; Coronado,Alfredo; Henríquez,Humberto;
Zootecnia Tropical , 2008,
Abstract: the cattle tick boophilus microplus is widely distributed in the world and causes significant economic losses. the aim of this work was to determine in vitro susceptibility of coumaphos ixodicide in adult ticks using five different concentrations including the manufacturer?s recommended dosage, and the larvae mortality using therapeutic dose. a sample of 240 engorged females was collected from four dairy farms in lara state, (60 ticks/farm), divided in groups of 10 ticks averaging 220 mg/tick. commercial coumaphos formulation (20%) was used to prepare the working concentrations of 125, 250, 500, 1000 and 2000 ppm for the adults immersion test (ait), and the control group was submerged in water. the shaw larvae immersion test was applied in larvae obtained of this ticks population. in farm 1, weight average of the total egg masses was significantly smaller in the groups treated with coumaphos at concentrations of 1000 and 2000 ppm with respect to control group. differences were not observed between the groups treated at the concentrations of 125, 250, 500, 1000 and 2000 ppm in each of the four farms. statistical differences not were observed in the efficacy among groups. higher concentrations of coumaphos did not increase the efficacy of the product. the adult ticks of b. microplus were resistant to coumaphos. mortality in larvae reached 100%.
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