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Search Results: 1 - 10 of 2745 matches for " Valle Bracero "
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Tesauros en HTML. Un modelo de dise o y estructura para su consulta en la malla mundial (WWW).
Valle Bracero, Antonio,del Rey Guerrero, Alfredo,Páez Ma?á, Jorge,Valle Bracero, Reyes
Revista Espa?ola de Documentación Científica , 2000,
Abstract: A new model is described for outliníng and structuring thesauri for their use as an aid in the database indexing through the World Wide Web (WWW). Several models used in the different on-line help managers were studied and used as main sources on the start up: AcroRead, HTML Help, NetHelp, etc. These on line help systems are used to provide easy access for the users to the operatíon guidelines for several commercial software packages. For this work the guidelines included in the Microsoft's HTML Help were used. The format used for the prototype thesauri in the trials is the native format of the CAT (Confección Automática de Tesauros) application developed in CINDOC. From this format and using the methodology outlined in this paper, an HTML file system including search indexes, location indexes and links was developed. This file system allows the user to go to the precise point of the text that refers to the search term. In that point the user will find a number of indications about the relationship between the search term and cither related items. These later ones can be also used as starting points for new searches. The preliminary trials made with different thesauri, both on-line and on CD-ROM have provided very good results. Se describe un modelo de dise o y estructura de tesauros para su consulta y utilización en tratamientos de indización de bases de datos a través de la malla mundial (WWW). Como fuentes de estudio de partida se analizaron los modelos empleados en diferentes gestores de documentación de ayuda: AcroRead, HTML Help, NetHelp, etc., utilizados para facilitar, a los usuarios de las diferentes aplicaciones, las normas de uso de las mismas. Para la elaboración del trabajo, se han adoptado las directrices expuestas en Microsoft's HTML Help . El formato origen de los tesauros piloto, empleados en las pruebas, ha sido el establecido para la aplicación CAT (Confección Automática de Tesauros) desarrollada en el CINDOC. Desde dicho formato, con la metodología descrita en el presente trabajo, se ha obtenido un árbol de ficheros HTML que incorpora índices de búsqueda, localización y enlace, que permiten al usuario, mediante un programa navegador, un posicionamiento en el lugar del texto que hace referencia al término objeto de su búsqueda. En dicho posicionamiento pueden observarse indicaciones sobre las relaciones del término seleccionado con otros términos. Estos últimos pueden servir, a su vez, como elementos idóneos para realizar nuevos posicionamientos. Las pruebas realizadas sobre diferentes tesauros, tanto en red como en CD-ROM, han sid
Experimental Assessment of the Battery Lifetime in WSN Based on the Duty-Cycle Current Average Method  [PDF]
Leonardo Barboni, Maurizio Valle
Wireless Sensor Network (WSN) , 2014, DOI: 10.4236/wsn.2014.610021
Abstract: A great amount of work addressed methods for predicting the battery lifetime in wireless sensor systems. In spite of these efforts, the reported experimental results demonstrate that the duty-cycle current average method, which is widely used to this aim, fails in accurately estimating the battery life time of most of the presented wireless sensor system applications. The aim of this paper is to experimentally assess the duty-cycle current average method in order to give more effective insight on the effectiveness of the method. An electronic metering system, based on a dedicated PCB, has been designed and developed to experimentally measure node current consumption profiles and charge extracted from the battery in two selected case studies. A battery lifetime measurement (during 30 days) has been carried out. Experimental results have been assessed and compared with estimations given by using the duty-cycle current average method. Based on the measurement results, we show that the assumptions on which the method is based do not hold in real operating cases. The rationality of the duty-cycle current average method needs reconsidering.
Evaluación del programa de diagnóstico prenatal de las malformaciones congénitas por cuantificación de la alfafetoproteína: Camagüey 1985-1998
Dyce Gordon,Elisa; Moras Bracero,Fidel; León Vargas,María; Conde Díaz,Oscar;
Revista Cubana de Investigaciones Biom??dicas , 2003,
Abstract: a descriptive cross-sectional study was conducted at "dr. eduardo agramonte pi?a" pediatric hospital, in camagüey, aimed at evaluating the program of prenatal diagnosis of congenital malformations by the quantification of the alpha-fetoprotein in maternal serum. data of the pregnant women screened from june, 1985, to december, 1988, were used. data were taken from the book of entry of samples of maternal serum and from the books for the control of alpha-fetoprotein elevations, as well as from the annual reports of the program of genetics and the provincial registry of infant mortality. the catchment of expectants increased during the last years, growing by 99.3 % in 1996. the total coverage was 92.2 %. the total percentage of alpha-fetoprotein elevations was 5.5. the main cause of the rise of the protein was the mistake made on estimating gestational age (23.3 %). followed by twin births (4.5 %) , congenital malformations and other abnormalities (3.7 %), and fetal loss (3.2 %). the most diagnosed malformations were the defects of the neural tube and those of the anterior abdominal wall. of the total of prenatally diagnosed malformations, 48.23 % (n =299) evolved with serum elevation of alpha-fetoprotein. the infant mortality rate due to congenital abnormalities decreased from 2.71, in 1985, to 1.77 per 1 000 live births, in 1998. the program of prenatal diagnosis of congenital malformations by determining alpha-fetoprotein in maternal serum has been improved in time. a proof of it is the increase of screenings among pregnant women and of the number and type of diagnosed malformations, as well as the reduction of infant mortality from these abnormalities.
Evaluación del programa de diagnóstico prenatal de las malformaciones congénitas por cuantificación de la alfafetoproteína: Camagüey 1985-1998
Elisa Dyce Gordon,Fidel Moras Bracero,María León Vargas,Oscar Conde Díaz
Revista Cubana de Investigaciones Biom??dicas , 2003,
Abstract: Se realizó un estudio descriptivo transversal en el Hospital Pediátrico "Dr. Eduardo Agramonte Pi a" de Camagüey, con el objetivo de evaluar el Programa de diagnóstico prenatal de las malformaciones congénitas, a través de la cuantificación de la alfafetoproteína en suero materno. Se utilizaron los datos de las embarazadas pesquisadas desde junio de 1985 hasta diciembre de 1998. Los datos se obtuvieron de los libros de entrada de muestras de suero materno y de los libros de control de las elevaciones de la alfafetoproteína, así como los informes anuales del Programa de Genética y el Registro Provincial de mortalidad infantil. La captación de embarazadas fue en aumento a lo largo de estos a os, alcanzó en 1996, 99,3 %. La cobertura total resultó de 92,2 % y el porcentaje total de elevaciones de alfafetoproteína de 5,6. La principal causa de elevación de la proteína fue el error en la estimación de la edad gestacional (23,3 %), seguida por los embarazos gemelares (4,5 %), las malformaciones congénitas y otras anomalías (3,7 %), y luego las pérdidas fetales (3,2 %). Las malformaciones principalmente diagnosticadas fueron los defectos del tubo neural y las de la pared abdominal anterior. Del total de malformaciones prenatalmente diagnosticadas, 48,23 % (N= 299) evolucionaron con elevación sérica de la alfafetoproteína. La tasa de mortalidad infantil por anomalías congénitas disminuyó de 2,71 en 1985 a 1,77 por 1 000 nacidos vivos en 1998. El Programa de diagnóstico prenatal de las malformaciones congénitas a través de la determinación de la alfafetoproteína en suero materno, se ha ido perfeccionando a través del tiempo, hecho que se manifiesta con el aumento del pesquisaje en las embarazadas, del número y tipo de malformaciones diagnosticadas, así como en el descenso de la mortalidad infantil por estas anomalías. A descriptive cross-sectional study was conducted at "Dr. Eduardo Agramonte Pi a" Pediatric Hospital, in Camagüey, aimed at evaluating the Program of prenatal diagnosis of congenital malformations by the quantification of the alpha-fetoprotein in maternal serum. Data of the pregnant women screened from June, 1985, to December, 1988, were used. Data were taken from the book of entry of samples of maternal serum and from the books for the control of alpha-fetoprotein elevations, as well as from the annual reports of the Program of Genetics and the Provincial Registry of infant mortality. The catchment of expectants increased during the last years, growing by 99.3 % in 1996. The total coverage was 92.2 %. The total percentage of alpha-fetoprotein eleva
Cuerpo y Masculinidad: Los Desórdenes Alimentarios en Hombres
José Toro-Alfonso,Karen Nieves Lugo,Néstor Borrero Bracero
Revista Interamericana de Psicología , 2010,
Abstract: Estudio descriptivo mediante encuesta con muestras no probabilíticas con 300 estudiantes varones universitarios para explorar la presencia de trastornos alimentarios y su relación con la masculinidad hegemónica. Utilizamos un instrumento con una escala de trastornos alimentarios y una escala de adherencia a la masculinidad. Incluimos además una escala de imagen corporal. La edad promedio de los participantes fue de 23 a os. Los participantes informaron estar cursando estudios universitarios con 39% (n=117) en cuarto a o, 29% (n=86) en quinto a o y 14% (n=42) cursando estudios postgraduados. El 13 % de los participantes mostró indicadores de trastornos alimentarios. De estos, 58% se autoidentificaron como homosexuales. El 16% de los participantes mostraron tener insatisfacción con su imagen corporal. De estos, el 65% se auto-identificó como homosexual. Se encontró relación significativa entre los que se identificaron como homosexuales, tener dificultades con la imagen corporal y manifestar trastornos alimentarios. El 35% de los participantes reportaron una alta adherencia al modelo hegemónico de la masculinidad y 29% mostraron una adherencia moderada. Se examinan los significados de la relación entre la homosexualidad y los trastornos alimentarios además de que se exploran recomendaciones para desarrollar más estudios sobre los desórdenes alimentarios en hombres.
Clouds and aerosols in Puerto Rico – a new evaluation
J. D. Allan,D. Baumgardner,G. B. Raga,O. L. Mayol-Bracero
Atmospheric Chemistry and Physics Discussions , 2007,
Abstract: The influence of aerosols, both natural and anthropogenic, remains a major area of uncertainty when predicting the properties and behaviour of clouds and their influence on climate. In an attempt to better understand warm cloud formation in a tropical marine environment, a period of intensive measurements using some of the latest developments in online instrumentation took place in December 2004 in Puerto Rico. Simultaneous online measurements of aerosol size distributions, composition, hygroscopicity and optical properties were made near the lighthouse of Cape San Juan in the north-eastern corner of the island and at the top of East Peak mountain (1040 m a.s.l.), the two sites separated by 17 km. Additional measurements of the cloud droplet residual and interstitial aerosol properties were made at the mountain site, accompanied by measurements of cloud droplet size distributions, liquid water content and the chemical composition of cloud and rain water samples. Both aerosol composition and cloud properties were found to be sensitive to wind sector. Air from the east-northeast (ENE) was mostly free of anthropogenic influences, the submircron fraction being mainly composed of non-sea salt sulphate, while that from the east-southeast (ESE) was found to be moderately influenced by populated islands upwind, adding smaller (<100 nm), externally mixed, carbonaceous particles to the aerosol that increased the number concentrations by over a factor of 3. This change in composition was also accompanied with a reduction in the measured hygroscopicity and fractional cloud activation potential of the aerosol. At the mountain site, the average cloud droplet concentrations increased from 193 to 519 cm 3, median volume diameter decreased from 20 to 14 μm and the liquid water content increased from 0.24 to 0.31 g m 3 when the winds shifted from the ENE to ESE. Larger numbers of interstitial particles were recorded, most notably at sizes greater than 100 nm, which were absent during clean conditions. The average size of the residual particles and concentrations of cloudwater nitrate, sulphate and insoluble material increased during polluted conditions. Previous studies in Puerto Rico had reported the presence of a significant non-anthropogenic organic fraction in the aerosols measured and concluded that this was a factor controlling the in situ cloud properties. However, this was not observed in our case. In contrast to the 1.00±0.14 μg m 3 of organic carbon measured in 1992 and 1995, the organic matter measured in the current study of 0.17±0.35 μg m 3 is many times low
Clouds and aerosols in Puerto Rico ─ a new evaluation
J. D. Allan,D. Baumgardner,G. B. Raga,O. L. Mayol-Bracero
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2008,
Abstract: The influence of aerosols, both natural and anthropogenic, remains a major area of uncertainty when predicting the properties and behaviour of clouds and their influence on climate. In an attempt to better understand warm cloud formation in a tropical marine environment, a period of intensive measurements took place in December 2004 in Puerto Rico, using some of the latest developments in online instrumentation such as aerosol mass spectrometers, cloud condensation nuclei counters and a hygroscopicity tandem differential mobility analyser. Simultaneous online measurements of aerosol size distributions, composition, hygroscopicity and optical properties were made near the lighthouse of Cape San Juan in the north-eastern corner of the island and at the top of East Peak mountain (1040 m a.s.l.), the two sites separated by 17 km. Additional measurements of the cloud droplet residual and interstitial aerosol properties were made at the mountain site, accompanied by measurements of cloud droplet size distributions, liquid water content and the chemical composition of cloud and rain water samples. Both aerosol composition and cloud properties were found to be sensitive to wind sector. Air from the east-northeast (ENE) was mostly free of anthropogenic influences, the submicron fraction being mainly composed of non-sea salt sulphate, while that from the east-southeast (ESE) was found to be moderately influenced by populated islands upwind, adding smaller (<100 nm), externally mixed, carbonaceous particles to the aerosol that increased the number concentrations by over a factor of 3. This change in composition was also accompanied with a reduction in the measured hygroscopicity and fractional cloud activation potential of the aerosol. At the mountain site, the average cloud droplet concentrations increased from 193 to 519 cm 3, median volume diameter decreased from 20 to 14 μm and the liquid water content increased from 0.24 to 0.31 g m 3 when the winds shifted from the ENE to ESE. Larger numbers of interstitial particles were recorded, most notably at sizes greater than 100 nm, which were absent during clean conditions. The average size of the residual particles and concentrations of cloudwater nitrate, sulphate and insoluble material increased during polluted conditions. Previous studies in Puerto Rico had reported the presence of a significant non-anthropogenic organic fraction in the aerosols measured and concluded that this was a factor controlling the in situ cloud properties. However, this was not observed in our case. In contrast to the 1.00±0.14 μg m 3 o
Data Mining and Exploratory Data Analysis for the Evaluation of Job Satisfaction  [PDF]
Rosaria Lombardo, Ermelinda Della Valle
iBusiness (IB) , 2011, DOI: 10.4236/ib.2011.34050
Abstract: In this paper we face off the relationship value management which is a theme in the relationship marketing literature gaining increasing attention in the last decade. The main aim of this study is to evaluate job quality and in particular employees’ satisfaction of non-profit enterprises by using, among different exploratory data analysis tools, ordered multiple correspondence analysis which is a part of corporate data mining. We focus attention on Ordered Multiple Correspondence Analysis (OMCA), recently proposed in statistical literature, to monitor (dis)satisfaction in different times or spaces. In particular we present a new strategy based on OMCA which allows to deal with ordered variables (Likert items) taking into account other qualitative information of job (kind of job contract, type of incentives, etc.) affecting the overall satisfaction of employees.
Social class, marginality and self-assessed health: a cross-sectional analysis of the health gradient in Mexico
Adolfo Valle
International Journal for Equity in Health , 2009, DOI: 10.1186/1475-9276-8-3
Abstract: To empirically examine the gradient effect of social class on self-rated health in Mexico, a secondary cross-sectional mixed-level analysis was designed. Using individual level data from the Second National Health Survey (ENSA II), social class categories were specified following a stratification approach according to the occupation and education indicators available from ENSA II. Two types of categories were made, one for t urban and one for the rural labor force. Two indicators of perceived health status were used as health outcomes: self-assessed health and reported morbidity. Furthermore, the marginality index, an indicator of relative deprivation was used to examine its contextual effect at the state and regional level. The analysis was conducted using logistic multivariate models.The cross-sectional analysis showed a gradient effect of social class for good assessed-health. Relative to the low urban class, the odds ratio (OR) for a good perception of health for individuals belonging to the high urban class was 2.9 (95% confidence interval: 2.1–3.9). The OR for the middle high class was 2.8 (95% confidence interval: 2.4–3.4), while the OR for the middle low class was 1.8 (95% confidence interval: 1.6–2.1). However, for the rural labour force an OR of 1.5 was only significant between the high class who considered their health as good relative to the low class (95% confidence interval: 1.02–2.2). At the aggregate level, the results also showed individuals living in deprived regions were less likely to report their health as good than individuals living in relatively less deprived ones, OR = 0.6 (95% confidence interval: 0.4–0.7).Overall, the findings of this study provided empirical evidence that social inequality negatively influences health through a differential exposure and an unequal distribution of resources across the class spectrum: the lower the social class, the poorer the perception of health. The results also showed that living in more deprived region
Transgênicos sem maniqueísmo
Valle, Silvio;
História, Ciências, Saúde-Manguinhos , 2000, DOI: 10.1590/S0104-59702000000300017
Abstract: we live in an era characterized by the hegemony of science and technology, an era fraught with questions awaiting answers which would enable a safe and sustainable future for humankind. the development of agro-industrial processes - food products in particular - through recombinant dna technology has enhanced the profit prospects of the few big biotechnology companies and of large-scale farmers who have access to the latest technological developments. we thus oppose a moratorium on recombinant dna technology. moreover, hasty statements about risk-free transgenics may be misleading in the absence of extensive safety tests. there is a pressing need for the establishment of a biosafety policy in this country involving the organized civil society and every government agency responsible for monitoring such matters. there is also the need to put in place a bio-surveillance and a code of ethics regarding genetic manipulation.
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