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匹配条件: “ Edith Lopez” ,找到相关结果约5368条。
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Obituario.Jorge Eduardo Wright (1922-2005)
Silvia Edith Lopez
Darwiniana , 2005,
Abstract:
Jorge Eduardo Wright (1922-2005)
Silvia Edith Lopez,Daniel Cabral
Boletín de la Sociedad Argentina de Botánica , 2005,
Abstract:
Lichnerowicz-Jacobi cohomology and homology of Jacobi manifolds: modular class and duality
Manuel de Leon,Belen Lopez,Juan C. Marrero,Edith Padron
Mathematics , 1999,
Abstract: Lichnerowicz-Jacobi cohomology and homology of Jacobi manifolds are reviewed. We present both in a unified approach using the representation of the Lie algebra of functions on itself by means of the hamiltonian vector fields. The use of the associated Lie algebroid allows to prove that the Lichnerowicz-Jacobi cohomology and homology are invariant under conformal changes of the Jacobi structure and to stablish the duality between Lichnerowicz-Jacobi cohomology and homology when the modular class vanishes. We also compute the Lichnerowicz-Jacobi cohomology and homology for a large variety of examples.
Development Process of Intermodal Transport Solutions: The Case of Dedicated Solutions Based on Large Shippers’ Volumes  [PDF]
Edith Sorkina
Journal of Transportation Technologies (JTTs) , 2012, DOI: 10.4236/jtts.2012.24035
Abstract: The objective of this paper is to create a process view of the development of intermodal transport solution from the basic idea to implementation. Special case of dedicated solutions based on large shippers’ volumes is chosen, where the shippers engage in the development process of the new solutions. Research is conducted using a qualitative approach: multiple case studies. Empirical data has been obtained through in-depth semi-structured interviews with relevant respondents involved in the development projects. Shippers’ perspective on the development process is studied. Development process can be described through a generic four-stage process: Initiation, Planning, Implementation, and Further Development. Different actors and different resources are required at the different stages. The complex process of establishing new intermodal solutions has lacked attention in the intermodal research. Understanding and improving the development process of new intermodal solutions is considered to have an important effect on the viability of intermodal transport and can help to understand the barriers that prevent companies from switching to intermodal. Development process of new dedicated intermodal solutions is a gradual process of building up the transport solution in a continuous interaction between shippers and transport service providers. Research has focused on the shipper perspective on inter-modal transport, showing that switching to an intermodal transport is not simply a mode choice issue, but involves a transition process that takes time, demands resources, cooperation/coordination between multiple parties, may require changes in the supply chain beyond the transport link, involves multiple actors, and involves an industry that is itself in a process of change.
ESTANDARIZACION DE ANALISIS DE METILESTERES DE áCIDOS GRASOS POR LA TECNICA DE CROMATOGRAFIA DE GASES ACOPLADA A ESPECTROMETRIA DE MASAS
JUAN PABLO LOPEZ V.,JUAN PABLO ARRUBLA V.,GLORIA EDITH GUERRERO
Scientia Et Technica , 2009,
Abstract: Se realizó la estandarización del análisis de metilésteres de ácidos grasos (FAME s) por cromatografía de gases acoplada a espectrometría de masas (CG-EM) utilizando impacto electrónico (EI) e ionización química (CI). En este estudio se evaluaron los parámetros estadísticos: precisión, linealidad, límite de detección y cuantificación, sensibilidad y coeficiente de correlación. Los resultados mostraron que el análisis por impacto electrónico presentó valores estadísticos adecuados para la identificación y cuantificación de los metilesteres, sin embargo los espectros de masas de los FAME s presentaron como ión molecular a [M +1]+ y no tienen iones comunes, luego es mas fácil la identificación mediante CI. La muestra real fue aceite de crisálida del Bombix mori Linn obtenidas de crisálidas del Hibrido Pilamo 1 cultivado en la región cafetera. El aceite mostró ácido oleico y ácido palmitico como componentes mayoritarios (43,752 y 26,300% respectivamente).
Transmission of Multidrug-Resistant and Drug-Susceptible Tuberculosis within Households: A Prospective Cohort Study
Louis Grandjean?,Robert H. Gilman?,Laura Martin?,Esther Soto?,Beatriz Castro?,Sonia Lopez,Jorge Coronel?,Edith Castillo?,Valentina Alarcon?,Virginia Lopez
PLOS Medicine , 2015, DOI: 10.1371/journal.pmed.1001843
Abstract: Background The “fitness” of an infectious pathogen is defined as the ability of the pathogen to survive, reproduce, be transmitted, and cause disease. The fitness of multidrug-resistant tuberculosis (MDRTB) relative to drug-susceptible tuberculosis is cited as one of the most important determinants of MDRTB spread and epidemic size. To estimate the relative fitness of drug-resistant tuberculosis cases, we compared the incidence of tuberculosis disease among the household contacts of MDRTB index patients to that among the contacts of drug-susceptible index patients. Methods and Findings This 3-y (2010–2013) prospective cohort household follow-up study in South Lima and Callao, Peru, measured the incidence of tuberculosis disease among 1,055 household contacts of 213 MDRTB index cases and 2,362 household contacts of 487 drug-susceptible index cases. A total of 35/1,055 (3.3%) household contacts of 213 MDRTB index cases developed tuberculosis disease, while 114/2,362 (4.8%) household contacts of 487 drug-susceptible index patients developed tuberculosis disease. The total follow-up time for drug-susceptible tuberculosis contacts was 2,620 person-years, while the total follow-up time for MDRTB contacts was 1,425 person-years. Using multivariate Cox regression to adjust for confounding variables including contact HIV status, contact age, socio-economic status, and index case sputum smear grade, the hazard ratio for tuberculosis disease among MDRTB household contacts was found to be half that for drug-susceptible contacts (hazard ratio 0.56, 95% CI 0.34–0.90, p = 0.017). The inference of transmission in this study was limited by the lack of genotyping data for household contacts. Capturing incident disease only among household contacts may also limit the extrapolation of these findings to the community setting. Conclusions The low relative fitness of MDRTB estimated by this study improves the chances of controlling drug-resistant tuberculosis. However, fitter multidrug-resistant strains that emerge over time may make this increasingly difficult.
Modeling Agricultural Change through Logistic Regression and Cellular Automata: A Case Study on Shifting Cultivation  [PDF]
Santiago Lopez
Journal of Geographic Information System (JGIS) , 2014, DOI: 10.4236/jgis.2014.63021
Abstract:

Agricultural expansion is one of the prime driving forces of global land cover change. Despite the increasing attention to the factors that cause it, the patterns and processes associated with indigenous cultivation systems are not well understood. This study analyzes agricultural change associated with subsistence-based indigenous production systems in the lower Pastaza River Basin in the Ecuadorian Amazon through a spatially explicit dynamic model. The model integrates multiple logistic regression and cellular automata to simulate agricultural expansion at a resolution consistent with small scale agriculture and deal with inherently spatial processes. Data on land use and cultivation practices were collected through remote sensing and field visits, and processed within a geographic information system framework. Results show that the probability of an area of becoming agriculture increases with population pressure, in the vicinity of existing cultivation plots, and proximity to the center of human settlements. The positive association between proximity to cultivation areas and the probability of the presence of agriculture clearly shows the spillover effect and spatial inertia carried by shifting cultivation practices. The model depicts an ideal shifting cultivation system, with a complete cropping-fallow-cropping cycle that shows how agricultural areas expand and contract across space and over time. The model produced relatively accurate spatial outputs, as shown by the results of a spatial comparison between the simulated landscapes and the actual one. The study helped understand local landscape dynamics associated with shifting cultivation systems and their implications for land management.

Ni?as y ni?os involucrados en procesos de sustracción familiar en México
Carrillo,Edith;
Revista Latinoamericana de Ciencias Sociales, Ni?ez y Juventud , 2011,
Abstract: the purpose of this paper is to provide elements for a broader discussion of the challenges faced by children who are involved in family disruption, and in particular, custody battles and abduction by a family member. to do this, there was analyzed the configuration of the familiy disruption from the narratives of the parents and the government employee located in the instances that have interference on this issue. the article seeks to demonstrate that although children are supposedly at the center of the dispute, in actuality their best interests are often times not taken into account. this is because instead of placing the wellbeing, of children first, gender and power relations between the adults involved overshadow children’s concerns in both public and private spheres.
Behaviour and orcadian rhythm of the fish bathygobius soporator Valenciennes (Gobiidae) under the influence of environmental salinity and temperature
Fanta, Edith;
Revista Brasileira de Zoologia , 1997, DOI: 10.1590/S0101-81751997000100021
Abstract: the behavioural patterns and their cireadian rhythms may be adaptive to the peculiar environmental conditions of subtropical brackish waters where ba-thygobius soporator valenciennes, 1837 live. adult fish were caught at the southern brazilian coast from mangrove rivers and rocky shores in a bay, where temperature and water salinity vary during the day and through the year. observation on the behaviour of the animals was undertaken in salinity 8.5ppt, 17.0ppt, 25.5ppt and 34.0ppt, each one in temperatures of 18oc and 28oc. temperature and salinity affect the frequency and intensity of some of the behavioural events, more than its pattern or rhythm. swimming is rare, decreasing along the day and with temperature increase, being even lower at low salinity; aggressiveness is the highest in the morning being not affected by temperature, but by salinity, being higher the higher it is; territory defence decreases along the day and is lower at high temperature and extreme salinities; fish hide more at high temperature and with the decrease of salinity, but this is not rhythmical; a higher proportion of fish rest in vertical position when salinity and temperature are high, increasing slightly at the beginning of the afternoon; respiratory frequency increases with temperature, salinity and in the afternoon; the colour of the fish is mainly light with spots in all hours of the day and in all temperatures and different levels of salinity, but with a tendency of the presence of some dark fish during the morning and some light ones in the afternoon, showing a higher variability of colours at low temperature and extreme salinities. besides temperature, salinity and light, feeding seems to be one of the determinant factors for the performance of the typical behaviour of b. soporator.
The Archaeology of early medieval (6th-12th century) rural settlements in France
Peytremann, Edith
Arqueología de la Arquitectura , 2013,
Abstract: This paper considers the story of the French archaeological research on early medieval rural settlements in the past four decades. The primary issues of this research have been presented and illustrated by examples from throughout France. El presente artículo aborda cuatro décadas de investigación arqueológica de los asenta mientos rurales altomedievales en Francia, con una presentación de los principales problemas encontrados y ejemplos recogidos de todo el país.
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