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Search Results: 1 - 10 of 4541 matches for " Montserrat; Vidal "
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Experimental Analysis of Voice and Data Transmission Parameters for Mobile Terminals in Cellular Data Networks  [PDF]
Montserrat Jiménez-Licea, Sergio Vidal-Beltrán, José Luis López-Bonilla
Wireless Engineering and Technology (WET) , 2011, DOI: 10.4236/wet.2011.21002
Abstract: This work presents the experimental results related to performance measurements in GSM and GPRS cellular data networks. Two Mobile Terminals were used, in order to take place the scenario. Power Level, Power vs Time, Modula-tion Analysis, Modulation Spectrum, (BER) Bit Error Rate and Throughput were considered in this analysis.
Krige Method Application for the Coverage Analysis of a Node-B in a WCDMA Network  [PDF]
Jazmín Ponce-Rojas, Sergio Vidal-Beltrán, José Luis López-Bonilla, Montserrat Jimenez-Licea
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2011, DOI: 10.4236/ijcns.2011.43022
Abstract: This paper shows the procedure and application of the Krige Method (or Kriging) for the analysis of the power level radiated by a Base Station (also called Node B), through a group of samples of this power level, measured at different positions and distances. These samples were obtained using an spectrum analyzer, which will allow to have georeferenced measurements, to implement the interpolation process and generate coverage maps, making possible to know the power level distribution and therefore understand the behavior and performance of the Node B.
A Geographic Information System Applied to Coverage Maps of 3G Cellular Communications Networks  [PDF]
Jazmín Ponce-Rojas, Sergio Vidal-Beltrán, Marco A. Acevedo-Mosqueda, Montserrat Jimenez-Licea
Journal of Geographic Information System (JGIS) , 2011, DOI: 10.4236/jgis.2011.32010
Abstract: This paper shows the procedure to obtain a continuous coverage map based on a collection of power meas- urements using a Geographic Information System, through satellite photographs of the Professional Unit Adolfo Lopez Mateos, and a group of punctual samples of the power of the Common Pilot Channel (CPICH); which is used to estimate the radio communications channel conditions, taken at different positions and dis- tances. These samples were taken using specialized equipment to obtain georeferenced measurements, and by a technique of statistical prediction, as the Krige Method, generate continuous coverage maps, making it possible to know the distribution of power, and therefore understanding the behavior and configuration of a Base Station, which in third generation cellular systems is also called Node B.
A Comparison between Theoretical and Experimental Coverage Analysis in 3G Cellular Networks  [PDF]
Jazmín Ponce-Rojas, Mariana Eslava-Gutierrez, Montserrat Jiménez-Licea, Sergio Vidal-Beltrán
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2012, DOI: 10.4236/ijcns.2012.53019
Abstract: This paper shows a comparison between theoretical and experimental coverage analysis. Theoretical work is based on Okumura-Hata propagation model, which are compared with the measured data obtained through an experimental analysis en México City. It is important because all the network designers and managers have to take in account how the signals will arrive to the mobile devices. If they know it, they can install Nodes B (base stations) in the better place in the area in order to take advantage of the power radiated by the antenna.
El coste social de la depresión en la ciudad de Sabadell (2007-2008)
Pamias Massana,Montserrat; Crespo Palomo,Carlos; Gisbert Gelonch,Ramón; Palao Vidal,Diego J.;
Gaceta Sanitaria , 2012,
Abstract: objective: to determine the social cost and burden of depression in the city of sabadell (barcelona, spain) in 2007 and 2008. method: the social cost of depression was calculated using the prevalence approach, based on information obtained in the development of the european project against depression (eaad). the results referred to the cost of public resources used, and the sources came from the appropriate official registers. results: the direct public cost of depression in the city of sabadell was € 9,155,620 in 2007 and € 9,304,706 in 2008. the relative weight of primary care visits and the use of drugs accounted for more than 85% of direct costs. in the section of indirect costs, the cost of permanent work disability could not be obtained. indirect costs amounted to € 9,720,225 in 2007 and € 9,763,541 in 2008. in both years, the highest weight corresponded to temporary work disability reaching € 8,561,962 and € 7,333,181, respectively. conclusions: depression has a substantial economic impact on the health system because it is associated with high direct public costs. however, the lack of knowledge of the cost associated with permanent work disability is a major limitation, as this cost category represents the highest percentage for this disorder.
Niveles de plomo en sangre y factores de exposición en ni?os del estado de Morelos, México
Meneses-González,Fernando; Richardson,Vesta; Lino-González,Montserrat; Vidal,María Teresa;
Salud Pública de México , 2003, DOI: 10.1590/S0036-36342003000800006
Abstract: objective: to assess blood lead levels and lead exposure factors in children living in morelos state, mexico. material and methods: a cross-sectional study was conducted between june and october 1996, in 232 children aged 1-12 years, at hospital del ni?o morelense de cuernavaca, morelos, mexico. blood lead levels were measured by anodic voltameter, and exposure factors were collected by questionnaire. the lead concentration value was log transformed for statistical analysis. odds ratios were obtained for some risk factors. the statistical significative risk factors were later analyzed with anova. results: a total of 232 children were recruited (50% female); 73% resided in cuernavaca city. the geometric mean blood lead level was 6.7 μg/dl; 29.7% of the children had levels over 10 μg/dl; 66% reported use of lead glazed pottery for cooking, 36% for storing food, and 19% for drinking. conclusions: blood lead levels were similar to those reported in other mexican children studies, after the reduction of lead in gasoline. the main risk factors were use of lead glazed pottery and vehicle traffic intensity near the household. these results will be useful for future prevention and control interventions.
Depresión y riesgo de Demencia.
Eulàlia Izquierdo Munuera,Eduard Fernández Vidal,Montserrat Sitjas Carvacho,María Elías Abadías
Revista de la Asociación Espa?ola de Neuropsiquiatría , 2003,
Abstract: Desde ya hace algunas décadas existe una polémica creciente respecto al hecho de si la depresión melancólica en edades geriátricas debería constituir una entidad nosológica distinta a la del resto de depresiones. Varios estudios han constatado que existen factores biológicos, psicológicos y sociales diferenciales entre ellas que podrían justificar tal distinción. Además, recientemente, encontramos numerosos estudios que apoyan la hipótesis de que la depresión geriátrica constituye un factor de riesgo para el desarrollo de una demencia. Y aunque de sobras es conocida la diversidad de diagnósticos posibles de trastornos afectivos y también la heterogeneidad en su presentación clínica, en este artículo se revisaran algunas de las últimas investigaciones sobre el papel de la depresión involutiva en el desarrollo de una futura demencia y el papel de otros factores dentro de esta asociación. Finalmente, se expondrán también las hipótesis etiológicas para esta asociación más defendidas en la actualidad.
Niveles de plomo en sangre y factores de exposición en ni os del estado de Morelos, México
Meneses-González Fernando,Richardson Vesta,Lino-González Montserrat,Vidal María Teresa
Salud Pública de México , 2003,
Abstract: OBJETIVO: Evaluar los niveles de plomo en sangre de ni os morelenses y sus factores de exposición. MATERIAL Y MéTODOS: Estudio transversal para analizar, por voltametría anódica, los niveles de plomo en sangre de 232 ni os de 1 a 12 a os de edad, que acudieron de junio a octubre de 1996 al Hospital del Ni o Morelense de Cuernavaca, Morelos, México. Los factores de exposición se indagaron por cuestionario. El valor de concentración de plomo se transformó al logaritmo natural; se estimó la razón de momios para algunos factores de exposición que se incorporaron a un modelo de ANOVA. RESULTADOS: Se reclutaron 232 ni os (50% mujeres); 73% residentes en Cuernavaca. La media geométrica de plomo en sangre fue 6.7 μg/dl; 29.7% rebasaron los 10 μg/dl; 66% tenían antecedente de cocinar alimentos en barro vidriado; 36% de almacenar alimentos, y 19%, consumo de líquidos en ese material. CONCLUSIONES: Los niveles encontrados son similares a los reportados en otras poblaciones pediátricas mexicanas en los últimos a os. Entre los principales factores de exposición destacan el uso de barro vidriado para consumo de alimentos o líquidos y la intensidad del tráfico donde viven. Este es el primer estudio que documenta los niveles de plomo en sangre en población infantil de Morelos, México, y sus resultados son punto de partida para acciones futuras de control y prevención.
Treatment Efficiency by means of a Nonthermal Plasma Combined with Heterogeneous Catalysis of Odoriferous Volatile Organic Compounds Emissions from the Thermal Drying of Landfill Leachates
Daniel Almarcha,Manuel Almarcha,Elena Jimenez-Coloma,Laura Vidal,Montserrat Puigcercós,Iban Barrutiabengoa
Journal of Engineering , 2014, DOI: 10.1155/2014/831584
Abstract: The objective of the present work was to assess the odoriferous volatile organic compounds depuration efficiency of an experimental nonthermal plasma coupled to a catalytic system used for odor abatement of real emissions from a leachate thermal drying plant installed in an urban solid waste landfill. VOC screening was performed by means of HRGC-MS analysis of samples taken at the inlet and at the outlet of the nonthermal plasma system. Odor concentration by means of dynamic olfactometry, total organic carbon, mercaptans, NH3, and H2S were also determined in order to assess the performance of the system throughout several days. Three plasma frequencies (100, 150, and 200?Hz) and two catalyst temperatures (150°C and 50°C) were also tested. Under conditions of maximum capacity of the treatment system, the results show VOC depuration efficiencies around 69%, with average depuration efficiencies between 44 and 95% depending on the chemical family of the substance. Compounds belonging to the following families have been detected in the samples: organic acids, alcohols, ketones, aldehydes, pyrazines, and reduced sulphur compounds, among others. Average total organic carbon removal efficiency was 88%, while NH3 and H2S removal efficiencies were 88% and 87%, respectively, and odor concentration abatement was 78%. 1. Introduction When rain water percolates through the solid waste of a landfill there is a process of dissolution and transport of water soluble elements and organic and inorganic substances, such as heavy metals, ammonium, inorganic anions, and volatile and semivolatile organic compounds, constituting a current that may end up reaching and significatively affecting the aquifers located in the peripheral areas of the facility and, therefore, potentially create risks to the environment and to human and animal health. A detailed summary of the composition of the leachates of urban solid waste (USW) landfills is included in [1], with data from the LEACH 2000 USA database. Different approaches have been developed for the leachate treatment in order to mitigate the possible impact of USW landfills [2–4]. The methods that are most often implemented (whether alone or in combination) are in-landfill recycling in order to increase the moisture of the waste that is being deposited and combined treatment with domestic sewage, aerobic and/or anaerobic biodegradation, chemical oxidation (including advanced oxidation), adsorption, precipitation, air stripping, microfiltration, ultrafiltration, nanofiltration, and reverse osmosis. As an alternative to the mentioned
Meso-American Nephropathy in El Salvador: Increasing Farmer Participation in MeN Prevention Efforts  [PDF]
Keven Bermudez, Carlos Orantes, Montserrat León, Marta Jiménez, Nicole Vidal, Pol De Vos
Occupational Diseases and Environmental Medicine (ODEM) , 2019, DOI: 10.4236/odem.2019.72005
Abstract: Objectives: This paper highlights and discusses major factors affecting Salvadoran farmers’ involvement in National Health System-led efforts to prevent MeN in El Salvador and includes some recommendations to enhance their involvement. Methods: The study, conducted in El Salvador in June 2018, involved 10 life-long farmers residing in five MeN-affected communities in Chalatenango and Usulutan Departments who were either MeN-free or MeN-controlled, to understand through semi-structured, qualitative interviews their experience of participation in broader epidemic control efforts. Complementary interviews held with two nephrology teams and a senior representative of the grassroots-level National Health Forum operating in the same area, provided necessary contrast. Interview questions were informed by reference to the Adaptation and Development after Persecution and Trauma (ADAPT) model [1] as applicable in post-conflict environments like El Salvador to analyze contextual factors influencing community participation. Findings: Farmers are scarcely involved in wider MeN prevention efforts in El Salvador despite greater National Health System emphasis on encouraging community participation since the approval of the 2009 Health Reform [2]. This study found that widespread insecurity due to gang warfare, declining family and social networks due to high murder rates and international migration, and unresolved sense of injustice over unremitting poverty are among major factors with potential destructive effect on farmer participation. Conclusions: Health system-led MeN prevention responses need to encompass attention to persisting social vulnerabilities in economically and socially marginalized communities in order to enhance farmer participation in this effort. This paper concludes with some recommendations on how this can be done.
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