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Search Results: 1 - 10 of 225409 matches for " Jaime Fernández Gómez "
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Descimbrado de estructuras de hormigón. Importancia del tipo de cemento y curado
Fernández Gómez, Jaime
Informes de la Construccion , 1986,
Abstract:
ANáLISIS DISCRIMINANTE DE ALGUNAS VARIABLES QUE INFLUYEN EN LA CONTAMINACIóN ACúSTICA DEBIDA AL TRáFICO URBANO EN UNA GRAN CIUDAD DISCRIMINANT ANALYSIS OF SOME VARIABLES THAT IMPACT ACOUSTIC CONTAMINATION CAUSED BY URBAN TRAFFIC IN A BIG CITY
Javier Morales Pérez,Jaime Fernández Gómez
Revista Ingenierías Universidad de Medellín , 2012,
Abstract: El ruido producido por el tráfico es función de un gran número de variables, unas propias de las características de la calzada y del entorno por el que discurre, y otras propias de los vehículos. De todas las variables que pueden influir, solo unas pocas están estudiadas en profundidad para ver su relación real con la contaminación acústica. El nivel de presión sonora, Leq, es el índice utilizado para evaluar la contaminación acústica, y la unidad de medida es el decibelio. Esta investigación consiste en la medición de todas las variables presentes en una gran ciudad que pudieran tener alguna influencia en la contaminación acústica, así como el nivel de ruido en la ciudad de Madrid. Todo ello mediante un trabajo de campo en el que se han medido 519 puntos de forma aleatoria, en los que se iban registrando todos estos datos. Noise caused by traffic is the result of several variables; ones inherent to features of roads and the environment it crosses, and some others inherent to vehicles. From all variables which could cause this kind of noise, only few of them have been studied in depth intended to understand its real relationship to acoustic contamination. The level of sound pressure (Leq.) is the index used for evaluating acoustic contamination and the unit of measure is the decibel. This research involves measurement of all variables present in a big city which could have an impact on acoustic contamination, as well as the level of noise in Madrid City. All this conducted through a field work where 519 places were randomly measured and all this data were recorded
Design and Implementation of a GPS Guidance System for Agricultural Tractors Using Augmented Reality Technology
Javier Santana-Fernández,Jaime Gómez-Gil,Laura Del-Pozo-San-Cirilo
Sensors , 2010, DOI: 10.3390/s101110435
Abstract: Current commercial tractor guidance systems present to the driver information to perform agricultural tasks in the best way. This information generally includes a treated zones map referenced to the tractor’s position. Unlike actual guidance systems where the tractor driver must mentally associate treated zone maps and the plot layout, this paper presents a guidance system that using Augmented Reality (AR) technology, allows the tractor driver to see the real plot though eye monitor glasses with the treated zones in a different color. The paper includes a description of the system hardware and software, a real test done with image captures seen by the tractor driver, and a discussion predicting that the historical evolution of guidance systems could involve the use of AR technology in the agricultural guidance and monitoring systems.
Evaluación automatizada de tierras para el cultivo de ajonjolí en relevo a maíz Automated land evaluation for cropping, maize and sesame in relay intercropping
Robertony Camas Gómez,Antonio Turrent Fernández,Jaime López Martínez,Pedro Cadena I?iguez
Revista mexicana de ciencias agrícolas , 2010,
Abstract: En la Frailesca, Chiapas el cultivo principal es maíz en monocultivo. Este se siembra principalmente en suelos de terraza intermedia, ubicados fisiográficamente entre suelos de vega a orillas de ríos y laderas. El objetivo de este estudio fue generar un modelo para planificar el establecimiento de maíz (Zea mays L.) de temporal y ajonjolí (Sesamun indicum L.) como cultivo en relevo después de maíz. El modelo se generó aplicando la metodología del sistema automatizado de evaluación de tierras de la FAO, ALES versión 4.5. Para esto se recabó información técnica, cartográfica y de campo para hacer una base de datos. El procesamiento de la cartografía se realizó por medio del software Arc View 3.2. Se clasificaron 22 unidades de tierra considerando las características físicas y químicas del suelo. Del área total evaluada el maíz presentó las siguientes aptitudes físicas: apta 2.3%, moderada 28.2%, marginal 50.3% y no apta 19.2%. Para el ajonjolí en relevo; 19.2% apta, 61.5% moderada y 19.2% no apta. Los rendimientos simulados fueron muy similares a las parcelas de validación y demostración establecidas en la región. Se concluyó que del área total evaluada y cultivada con maíz en monocultivo, 80.7% puede intensificarse mediante la introducción de ajonjolí en relevo, y además el sistema automatizado de tierras permite realizar una planificación confiable para el uso del suelo. In the Frailesca, Chiapas, maize is the main crop in monoculture. It is mainly Brown in intermediate terrace soils, located physiographically between lowland soils on river banks and hillsides. The aim of this study was to create a model to plan the establishment of maize (Zea mays L.) as a seasonal crop and sesame (Sesamun indicum L.) as a relay crop after maize. The model was created by applying the FAO methodology for automatic land evaluation, ALES version 4.5. In order to do this, technical, cartographic and field information was gathered in order to create a data base. Maps were processed using the program Arc View 3.2. Twenty two units of land were classified, considering the soil's physical and chemical characteristics. Out of the total area evaluated, maize displayed the following physical aptitudes: adequate 2.3%, moderate 28.2%, marginal 50.3% and inadequate 19.2%. For the relay sesame; 19.2% was adequate, 61.5% moderate and 19.2% inadequate. The simulated yields were very similar to the validation and demonstration parcels established in the area. It was concluded that out of the total area evaluated and cultivated with maize in monoculture, 80.7% can be intensified by intro
La vacunación antisarampionosa en México por el método de aerosol
FERNáNDEZ-DE CASTRO,JORGE; KUMATE- RODRíGUEZ,JESúS; SEPúLVEDA,JAIME; RAMíREZ- ISUNZA,JOSé MANUEL; VALDESPINO-GóMEZ,JOSé LUIS;
Salud Pública de México , 1997, DOI: 10.1590/S0036-36341997000100009
Abstract: the present work describes the anti-measles vaccination program by the inhaled aerosol method undertaken in mexico between 1988 and 1990. detailed descriptions are given of the equipment, staff, training programs, promotion and campaigns. the vaccine is specified: edmonston-zagreb strain cultured in diploid cells at the instituto nacional de virología of the secretaría de salud in mexico with titres varying from 1045 plaque forming units (pfu/ml) to 1 048 pfu/ml administered in a 30 sec inhalation with aerosol. during this exposure period, 2 800 to 4 000 pfu per child are estimated to enter the child, of which approximately 25% is the retained dosis, i.e. 700 to 1 000 pfu/child. a total of 3 760 684 children of school and pre-school age have been vaccinated in 13 of the 32 federal entities of the country. no undesirable effects of any importance were observed, and the limited serological and field studies support the effectiveness and security of this method. on the other hand, the method is much cheaper, faster and better accepted by the population than the subcutaneous injection.
Seroprevalencia de anticuerpos contra el poliovirus 1 en ni?os mexicanos
Ruiz-Gómez,Juan; Valdespino,José Luis; Olaiz-Fernández,Gustavo; Arias-Toledo,Eloísa; Sepúlveda,Jaime;
Salud Pública de México , 2007, DOI: 10.1590/S0036-36342007000900007
Abstract: objective: to analyze the frequency and distribution of the prevalence of antibodies against the poliomyelitis type 1 virus in children 1-9 years old in mexico. material and methods: antibodies against poliovirus type 1 (neutralization method) were studied in 6 270 sera selected from the 24 232 sera from children one to nine years old, collected by the 2000 national health survey (ensa 2000) that was conducted from november 1999 to june 2000. results: overall seroprevalence was 99.3% (95%ci: 99.1-99.7). using bivariate analysis, absence of antibodies was shown to be associated with illiteracy (or= 1.5, p=0.002) and low household income (or= 1.4, p=0.0487), while those children having access to social security (or= 0.41 p=0.04) had a higher likelihood of having protective antibodies. conclusions: the vaccination program activities conducted by health institutions have been successful in the control and eradication of the disease. however, a note of caution is necessary since the expansion of data reveals that although seroprevalence of antibodies has an upper limit of 99.3%, 0.7% of children (roughly 190 000) are susceptible to developing the disease. most of these children live in the southern regions of the country.
Encuesta serológica nacional del sarampión en ni?os: evidencias para su eliminación
Ruiz-Gómez,Juan; Valdespino,José Luis; Olaiz-Fernández,Gustavo; Arias-Toledo,Eloísa; Sepúlveda,Jaime;
Salud Pública de México , 2007, DOI: 10.1590/S0036-36342007000900008
Abstract: objective: to analyze the frequency and distribution of protective antibodies against measles in a sample of children from 1-9 years old representative of each of the 32 states in mexico; to contribute to the evaluation of the measles vaccination programs. material and methods: measles antibodies (plaque reduction neutralization (prn) assay) were studied in 6 270 sera selected from the 24 232 sera from children 1-9 years of age, collected by the 2000 national health survey (ensa 2000) that was conducted from november 1999 to june 2000. results: proportion of seropositive samples (>120 iu/l) among 1-4 year-old children (98.3% [95%ci: 97.7-98.8]) was less than that of 5-9 year-old children (99.4% [95%ci: 99.2-99.6]; p<0.001). seropositivity was associated with the number of measles and/or measles-rubella-mumps vaccine doses and was not associated with gender, place of residence or socio-economic status. conclusions: the results show that there is adequate vaccination coverage. however, the expansion of data revealed that there are 417 000 children with negative antibody titers who are susceptible to acquiring the disease, transmitting the virus and causing outbreaks.
Estudio situacional de siete revistas latinoamericanas de neumología
Oyarzún Gómez, Manuel;Ramírez Venegas, Alejandra;Agüero Fernández, Adalberto;Martínez, José Ant?nio Baddini;Bermúdez Gómez, Mary;Cáneva, Jorge O.;Morales Blandir, Jaime E.;Pérez-Padilla, Rogelio;
Jornal Brasileiro de Pneumologia , 2007, DOI: 10.1590/S1806-37132007000300021
Abstract: objective: to characterize the situation of pulmonology journals published in latin america. methods: a survey was conducted in a meeting sponsored by the latin american thoracic society. each journal editor presented a report and answered a questionnaire. results: improving information acquisition is the main motivation for pulmonology societies to edit their own journals, whereas disseminating medical knowledge and reporting experiences are the main motivations for authors to submit papers. the most common failing in the manuscripts submitted is poor compliance with the journal guidelines. improving author-editor-reviewer relationships would be the best strategy for improving the quality of manuscripts. suggestions for improving latin american journals included the following: promoting professionalism in editorial tasks; encouraging manuscript reviewers to be more meticulous; and embracing international norms for editing medical journals. the following major problems were reported: a lack of regular, appropriate periodicity of issues; a shortage of original papers that are considered 'milestones' in the specialty; a low rejection rate for submitted papers; a high turnover of editors. conclusion: based on our findings, we can make the following recommendations: although many journals are available in electronic form, they should also be maintained in print form; each journal should divulge its subscription fee, even if it is included in the annual society membership dues; although each latin american country might decide to publish its own pulmonology journal, the feasibility of publishing a multinational latin american pulmonology journal should be explored.
Balanzas y romanas de bronce en los mercadillos de antigüedades de Sevilla
Fernández Gómez, Fernando
Trabajos de Prehistoria , 1991,
Abstract: We present here several examples of Roman balances and steel-yards, some of them found in the antiquities market of Sevilla, and others conserved in its Archaeological Museum. Their structure and the variations of their scales are analized. The study is completed with a selection of weights from the same source. Se presentan diversos ejemplares de balanzas y romanas de bronce, localizados unos en los mercados de antigüedades de Sevilla y conservados otros en su Museo Arqueológico, analizándose su estructura y las variaciones que presentan sus barras graduadas. Se completa el estudio con una selección de pesas y contrapesos de la misma procedencia.
Erosión del suelo, escurrimiento y pérdida de nitrógeno y fósforo en laderas bajo diferentes sistemas de manejo en Chiapas, México
Camas Gómez, Robertony;Turrent Fernández, Antonio;Cortes Flores, José Isabel;Livera Mu?óz, Manuel;González Estrada, Adrián;Villar Sánchez, Bernardo;López Martínez, Jaime;Espinoza Paz, Néstor;Cadena I?iguez, Pedro;
Revista mexicana de ciencias agrícolas , 2012,
Abstract: in chiapas, mexico, soil erosion is the main problem affecting the sustainability of hillside lands. as a result, yields and incomes are low, and soil quality continues to decrease. with the aim of finding sustainable technological alternatives, an evaluation was performed on the following systems: maize in conservation tillage (mlc); maize in plant barriers (mbmv) and maize alternated with fruit trees (miaf), in terms of surface runoff, production of sediments and loss of nitrogen and phosphorous from june to november, 2009. the systems were set up in adjacent microbasins, belonging to the basin of river catarina, jiquipilas, chiapas. the soil is a typic haplustepts, with a slope that varies between 3 0 and 40%. out of the total rainfalls, 54% caused soil erosion, 15 % of these with rains of over 40 mm 62% of the total erosion. the runoff coefficient and the specific soil degradation were similar and lower in the micro basins; miaf (12, 5.8 t ha-1) and mbmv (13, 6.3 t ha-1 ) than in the microbasin with mlc (19, 16.8 t ha-1), respectively. in miaf, the runoff filter and total cover provided by maize and bean plants during most of the growth season played an important part in obtaining these results, despite this microbasin presenting a greater slope steepness and length. in regards to the nutrients, there was a greater loss of nitrates in the microbasin with the system mbmv, possibly due to the nitrogen contribution by the leftovers of the pruning ofgliricidia sepium. in regard to phosphorous, the system miaf displayed a greater loss, caused by the yearly phosphoric fertilization performed on the guava trees for three years.
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