6 results on '"Celada A"'
Search Results
2. Clinical and Functional Differences Between Mexican Youth at Clinical High Risk for Psychosis and With Familial High Risk.
- Author
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Nieto, Lourdes, Domínguez-Martínez, Tecelli, Rosel-Vales, Mauricio, Saracco-Alvarez, Ricardo, Celada-Borja, Cesar, and Rascón-Gasca, María Luisa
- Subjects
MEXICANS ,PSYCHOSES ,SOCIAL adjustment ,MARITAL status ,PERSONALITY - Abstract
Few studies have explored the differences in clinical psychopathology between youth at high risk for psychosis and those at familial high risk for psychosis. This study seeks to describe and compare the sociodemographic, clinical, and functional characteristics of At-Risk Mental State (ARMS) for psychosis youth and those with a first- or second-degree relative with psychosis (Familial High-Risk: FHR) in a Mexican sample. Twenty-one ARMS individuals and 21 with FHR were evaluated for sociodemographic characteristics, psychopathological symptoms, and functional impairment. ARMS individuals were significantly younger, had fewer years of schooling, and were more likely to be male than those in the FHR group. Groups did not differ as regards marital status or occupation. The ARMS group showed greater severity of prodromal symptoms, schizotypal personality traits, and general psychopathology than the FHR group. In addition, they reported more premorbid adjustment deficit from early adolescence than the FHR group. Current overall social and role functioning was significantly lower in the ARMS group. Findings are consistent with ARMS studies from other countries. First- or second-degree relatives of patients with psychosis should be considered a vulnerable group as they display several symptoms of general psychopathology and may experience social adjustment problems in their adult lives. The lack of early detection and intervention psychosis programs in Mexico underlines the need to prioritize the development of preventive strategies to help close the care gap. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
3. Cluster Analysis of the Wind Events and Seasonal Wind Circulation Patterns in the Mexico City Region.
- Author
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Carreón-Sierra, Susana, Salcido, Alejandro, Castro, Telma, and Celada-Murillo, Ana-Teresa
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AIR pollution ,HIERARCHICAL clustering (Cluster analysis) ,EUCLIDEAN distance ,ATMOSPHERIC circulation ,VORTEX motion - Abstract
The residents of Mexico City face serious problems of air pollution. Identifying the most representative scenarios for the transport and dispersion of air pollutants requires the knowledge of the main wind circulation patterns. In this paper, a simple method to recognize and characterize the wind circulation patterns in a given region is proposed and applied to the Mexico City winds (2001-2006). This method uses a lattice wind approach to model the local wind events at the meso-β scale, and hierarchical cluster analysis to recognize their agglomerations in their phase space. Data of the meteorological network of Mexico City was used as input for the lattice wind model. The Ward's clustering algorithm with Euclidean distance was applied to organize the model wind events in seasonal clusters for each year of the period. Comparison of the hourly population trends of these clusters permitted the recognition and detailed description of seven circulation patterns. These patterns resemble the qualitative descriptions of the Mexico City wind circulation modes reported by other authors. Our method, however, permitted also their quantitative characterization in terms of the wind attributes of velocity, divergence and vorticity, and an estimation of their seasonal and annual occurrence probabilities, which never before were quantified. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
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4. Main Characteristics of Mexico City Local Wind Events during the MILAGRO 2006 Campaign within a Meso-β Scale Lattice Wind Modeling Approach.
- Author
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Celada-Murillo, Ana-Teresa, Carreón-Sierra, Susana, Salcido, Alejandro, Castro, Telma, Peralta, Oscar, and Georgiadi, Teodoro
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WIND speed , *LATTICE models (Statistical physics) , *KATABATIC winds , *POLLUTANTS , *URBAN heat islands , *CIRCADIAN rhythms - Abstract
A characterization of local wind events in Mexico City, which occurred during MILAGRO campaign, was carried out within the framework of a lattice wind modeling approach at a meso-β scale. Mexico City was modeled as a 2D lattice domain with a given number of identical cells. Local wind conditions at any cell were described by a state variable defined by the spatial averages of wind attributes such as speed, direction, divergence, and vorticity. Full and partial densities of wind states were discussed under different conditions using two simple lattice wind models. We focus on the results obtained with the 1-cell lattice wind model and provide brief comments about preliminary results obtained with the 4-cell model. The 1-cell model allowed identifying the main patterns of the wind circulation in Mexico City throughout the study period (anabatic and katabatic winds, winds induced by the urban heat island, and winds with high possibilities for exchanging pollutants between Mexico City and the neighboring settlements, among others). The model showed that Mexico City wind divergence and vorticity disclose superposed oscillations whose most important periods were 24 and 12 hours, suggesting strong connections with the diurnal cycle of incoming solar radiation and the urban heat island. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
5. H2S emissions from Cerro Prieto geothermal power plant, Mexico, and air pollutants measurements in the area
- Author
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Peralta, Oscar, Castro, Telma, Durón, Matilde, Salcido, Alejandro, Celada-Murillo, Ana-Teresa, Navarro-González, Rafael, Márquez, Claudia, García, José, de la Rosa, José, Torres, Ricardo, Villegas-Martínez, Raymundo, Carreón-Sierra, Susana, Imaz, Mireya, Martínez-Arroyo, Amparo, Saavedra, Isabel, Espinosa, María de la Luz, and Torres-Jaramillo, Alejandro
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HYDROGEN sulfide , *POLLUTANTS , *EMISSIONS (Air pollution) , *METEOROLOGY , *AIR pollution , *GEOTHERMAL power plants - Abstract
Abstract: We measured meteorological parameters and environmental concentrations of hydrogen sulfide (H2S) and criteria pollutants at Cerro Prieto, Mexico, from May to July 2010. In addition, non-condensable gases from vent stacks at Cerro Prieto geothermal power plant were sampled and analyzed by gas chromatography–mass spectrometry. A dispersion model, which was validated with environmental measurements, was applied to H2S. Criteria pollutants never exceeded the Mexican air quality standards. Results from dispersion modeling were compared against measured concentrations showing acceptable agreements for Chi square goodness of fit (χ 2) in the 95% significance level (α =0.05), at afternoons and evening events when boundary layer is decreasing and wind speed is less than 5.5ms−1. Determination coefficient of curve fitting for computed concentrations at less than 4km from the source was 0.513 and farther 0.568. This study was the first to measure criteria pollutants and H2S in Cerro Prieto area. [Copyright &y& Elsevier]
- Published
- 2013
- Full Text
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6. Study of the regional air quality south of Mexico City (Morelos state)
- Author
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Salcedo, D., Castro, T., Ruiz-Suárez, L.G., García-Reynoso, A., Torres-Jardón, R., Torres-Jaramillo, A., Mar-Morales, B.E., Salcido, A., Celada, A.T., Carreón-Sierra, S., Martínez, A.P., Fentanes-Arriaga, O.A., Deustúa, E., Ramos-Villegas, R., Retama-Hernández, A., Saavedra, M.I., and Suárez-Lastra, M.
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AIR quality , *AIR pollution , *ATMOSPHERIC chemistry , *ATMOSPHERIC models , *ENVIRONMENTAL monitoring , *EMISSIONS (Air pollution) , *ENVIRONMENTAL indicators - Abstract
Abstract: Results from the first study of the regional air quality in Morelos state (located south of Mexico City) are presented. Criteria pollutants concentrations were measured at several sites within Morelos in February and March of 2007 and 2009; meteorological data was also collected along the state for the same time periods; additionally, a coupled meteorology–chemistry model (Mesoscale Climate Chemistry Model, MCCM) was used to gain understanding on the atmospheric processes occurring in the region. In general, concentrations of almost all the monitored pollutants (O3, NOx, CO, SO2, PM) remained below the Mexican air quality standards during the campaign; however, relatively high concentrations of ozone (8-hour average concentrations above the 60ppb level several times during the campaigns, i.e. exceeding the World Health Organization and the European Union maximum levels) were observed even at sites with very low reported local emissions. In fact, there is evidence that a large percentage of Morelos vegetation was probably exposed to unhealthy ozone levels (estimated AOT40 levels above the 3ppmh critical limit). The MCCM qualitatively reproduced ozone daily variations in the sites with an urban component; though it consistently overestimated the ozone concentration in all the sites in Morelos. This is probably because the lack of an updated and detailed emission inventory for the state. The main wind patterns in the region corresponded to the mountain–valley system (downslope flows at night and during the first hours of the day, and upslope flows in the afternoon). At times, Morelos was affected by emissions from surrounding states (Distrito Federal or Puebla). The results are indicative of an efficient transport of ozone and its precursors at a regional level. They also suggest that the state is divided in two atmospheric basins by the Sierras de Tepoztlán, Texcal and Monte Negro. [Copyright &y& Elsevier]
- Published
- 2012
- Full Text
- View/download PDF
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