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Search Results: 1 - 10 of 313 matches for " Villase?or "
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Ultra high energy cosmic rays: present status and recent results
Villase?or, L;
Revista mexicana de física , 2007,
Abstract: cosmic rays with energies above 1020 ev are the highest-energy particles ever observed in the universe. their flux is so small that up to now only about two dozen such particles have been detected by past and present observatories. their nature, the location of their sources and the mechanisms by which they are produced or accelerated constitute still a mystery worth of investigating by gathering much higher statistical samples of such events. the pierre auger observatory is a large-area hybrid detector that is under construction to study such ultra high energy cosmic rays. at present the southern site is near completion and it already constitutes the largest scientific observatory ever built to study cosmic rays. in this paper we describe the latest status of ultra high energy cosmic ray research with an emphasis on the pierre auger observatory.
Ultra high energy cosmic rays: present status and recent results
L. Villase?or
Revista mexicana de física , 2007,
Abstract: Los rayos c′osmicos con energ′ as de 1020 eV representan las part′ culas con mayor energ′ a jam′as observadas en el Universo. Su flujo es tan bajo que hasta ahora solo se han detectado unas dos docenas de estas part′ culas con observatorios pasados y presentes. Su naturaleza, la localizaci′on de sus fuentes, y los mecanismos por los que son producidas o aceleradas contin′uan siendo un misterio que vale la pena investigar obteniendo muestras estad′ sticas mucho mayores de dichos eventos. El Observatorio Pierre Auger es un detector h′ brido de gran ′area que se encuentra actualmente en construcci′on y que se dedicar′a a la observaci′on de rayos c′osmico de alta energ′ a. En este momento, el observatorio en el sur esta pr′acticamente terminado y ya constituye el mayor observatorio de rayos c′osmicos jam′as construido. En este art′ culo se describe el estado actual de la investigaci′on de rayos c′osmicos de ultra alta energ′ a haciendo ′enfasis en el papel del observatorio Pierre Auger.
Diversidad y distribución de las magnoliophyta de mexico
Villase?or,José Luis;
Interciencia , 2003,
Abstract: an updated account of the native flowering plants (magnoliophyta) of mexico records 75 orders, 248 families, 2657 genera and 22351 species, plus 2964 sub-specific taxa. such figures place the country among the five floristically richest countries of the world. the use of non-parametric methods for estimating diversity suggests that more than 6500 species may still be added to the flora of mexico; thus, its real floristic richness should be of about 29000 species. the floristic richness known for each of the 32 mexican states is examined. likewise, a list of the 248 families, indicating their number of genera and species in the country is provided; 81 of them are represented only by one genera and 29 only by one species. none of the mexican states shows an exceptional floristic richness; on the contrary, they are placed according to the normal richness parameters one should expect based solely on its area. it is concluded that the outstanding floristic richness found in mexico results from a high beta diversity, due to the large environmental heterogeneity found in almost all the country.
Metodología para la elaboración de guías de fuentes de información
Villase?or Rodríguez, Isabel;
Investigación bibliotecológica , 2008,
Abstract: a methodological approach for the elaboration of a guide to information sources is presented. after studying several of these guides in spanish, and analysing different methods applied to the creation of bibliographies, recommendations are made by the author for building this type or resource, bearing in mind that the experience gathered on the subject is essentially practical and not theoretical.
Una de cal por las que van de arena: un estudio diacrónico de los estucos de Calakmul y Palenque
Villase?or, Isabel;Aimers, James;
Estudios de cultura maya , 2009,
Abstract: this paper presents the results of petrographic and x-ray fluorescence analyses carried out in lime plaster samples from calakmul and palenque. technological differences observed in the samples are though to represent different building traditions and these changes are discussed in terms of the environmental contexts, the availability of raw materials, and the socio-political contexts of each of the chronological periods. a clear tendency of replacing lime for clays in order to produce mud plasters was clearly documented in terminal classic materials. we think this is a consequence of the breakdown in building traditions caused by the collapse of the sociopolitical structure of the sites, exacerbated perhaps by shortages of firewood. the selection of raw materials and the problems in the chronology of palenque's buildings is also discussed.
Ortega Villase?or,Humberto;
Alpha (Osorno) , 2004, DOI: 10.4067/S0718-22012004000200010
Abstract: this paper examines an approach to karl r. popper’s philosophical and epistemological proposition (philosophy of science), as a theoretical framework to analyze the links between literary and visual creativity. popper′s methodological proposal is briefly reviewed, as well as the way his epistemological categories are linked to the creative process, enriching it as a cognitive instrument. then the scope of this instrument as a tool for proving and predicting validity, is explored by applying it to a particular case: the creative process that led to the creation of 18 original visual works that attempt to reflect the original sounds of vowels and consonants.
Masculinidad, sexualidad, poder y violencia: análisis de significados en adolescentes
Salud Pública de México , 2003, DOI: 10.1590/S0036-36342003000700008
Abstract: objective: to analize perceived meanings of masculinity and power related to sexual violence among adolescents. material and methods: a qualitative study was carried out between 1998 and 2000 in the metropolitan area of guadalajara, mexico, among 155 junior high and high school male/female students. information was collected from 12 focal groups in two-hour sessions. data collection instruments included: interviews, observation, and instruction guides. data were recorded using notes and tape recordings. oral and written information was transcribed, categorized, and coded, in order to construct matrixes and interpret results. results: symbolic explanatory concepts related with rape included: constructivism vs. naturalism, heteronomous moral posture, and early exchange towards respect and human rights. females were perceived as the real and potential victims. males were perceived as violent by nature or under challenge, and prone to be victimized only if they were children, unmanly, or homosexual. analysis objects included motives, power, female′ refusal, accusation, consequences, management, and prevention. conclusions: sexual violence is symbolized within the realm of explanatory and moral controversy. the ideological values of masculinity legitimate both legal and judiciary impunity. social meanings and adolescent participation should be considered in research and interventions.
Rese a de "Chiapas a contrapelo. Una perspectiva sistémica" de Andrés Aubry
Guillermo Villase?or García
Argumentos (México, D.F.) , 2006,
Rese as de publicaciones: Otras formas de turismo. Luís Vicente Elías Pastor
Contreras Villase?or, Margarita
PASOS : Revista de Turismo y Patrimonio Cultural , 2009,
Las Heliantheae endémicas a México: una guía hacia la conservación
José Luis Villase?or
Acta botánica mexicana , 1991,
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