141,029 research outputs found
Dinámica de flujo del Sistema Acuífero Guaraní y sus sistemas acuíferos asociados en su región meridional (Uruguay y Brasil) basada en datos hidroquímicos, isotópicos y de gases nobles
No full textEste informe es una síntesis de los avances en el conocimiento del funcionamiento del Sistema Acuífero Guaraní, realizados por el Dr. Elías Teramoto y el Dr. Hendryx Gemeiner en el marco de sus actividades postdoctorales en el PEDECIBA Geociencias (Universidad de la República – Ministerio de Educación y Cultura).El Sistema Acuífero Guaraní (SAG) es uno de los sistemas acuíferos más grandes del mundo y constituye un recurso hídrico fundamental para Brasil, Argentina, Paraguay y Uruguay. La comprensión de la dinámica del flujo de agua subterránea dentro del SAG es esencial para el desarrollo de modelos conceptuales confiables que respalden su gestión sostenible. Numerosos estudios han analizado las características hidroquímicas e isotópi-cas del SAG, destacando el papel de las interacciones progresivas roca-agua en la evolu-ción hidroquímica del sistema. Sin embargo, algunos aspectos clave aún no se compren-den completamente. Este estudio integra datos hidrogeoquímicos e isotópicos, incluidos iones mayoritarios, isótopos estables y gases nobles disueltos, provenientes de 32 pozos de agua subterránea de la región meridional del SAG, en la región fronteriza entre Brasil y Uruguay. Abarca tanto las secciones confinadas como no confinadas del SAG, así como sus acuíferos suprayacentes del Sistema Acuífero Serra Geral (SASG) e infrayacentes Paleozoicos (Pre-SAG). Además, se realizaron simulaciones geoquímicas para compren-der mejor los procesos de evolución del agua subterránea. Una contribución significativa en este estudio fue la identificación de dos sistemas de flujo divergentes dentro del Sis-tema Acuífero Guaraní (SAG) en el territorio uruguayo. Los resultados revelaron que el SAG está intrincadamente interconectado con el SASG y el Pre-SAG, formando un sis-tema acuífero multicapa caracterizada por un intercambio significativo de agua subterrá-nea entre el SAG y esas unidades acuíferas. Los valores de aire en exceso, expresados como △Ne, fueron relativamente bajos y comparables entre las porciones no confinada y confinada del SAG, con valores de 12,7 ± 9,6 % y 10,7 ± 9,1 %, respectivamente. Las temperaturas promedio de gases nobles (NGT) calculadas indican que las condiciones de recarga han variado en el tiempo, con algunas muestras en el sector confinado del SAG que sugieren una recarga anterior al Último Máximo Glacial (LGM). Además, las signa-turas isotópicas e hidroquímicas, junto con los datos de gases nobles, sugieren una posible mezcla de las aguas subterráneas del SAG con acuíferos adyacentes, lo que desafía los modelos convencionales de circulación del agua subterránea que consideran al SAG como un sistema aislado. Estos hallazgos tienen implicaciones importantes para la gestión del agua subterránea, la modelización numérica del flujo y la estimación de los tiempos de residencia del agua subterránea en la región
Potential diagnostic and prognostic applications of monoclonal antibodies to human mammary carcinomas
No full textA monoclonal antibody (B72.3) defines pattern of distribution of a novel tumor associated antigen in human mammary carcinoma cell population
No full textSpatially-localized time dependent solutions including turbulence and their interactions in 2D Kolmogorov flow
No full textIn 2D Kolmogorov flow in small aspect ratio domains, spatially-localized solutions such as kink, traveling or time-dependent kink-antikink pars coexist. However, the conservation of the flow rate in the y direction strongly restrict combination of localized solutions and their positioning. We find that by adding a homogeneous flow U y their positioning is controlled and each of localized solutions including a spatially-localized chaos is isolated. Numerical results suggest that these isolated solutions can be elements constructing a whole flow
Auditory object-motion perception during actual self-motion
No full textWe investigated the effect of actual self-motion on auditory object-motion detection. There have been several studies that investigate how eye, head, and whole body movements modulate visual motion processing. However, less is known about their effects on auditory motion processing. Our previous study showed that sounds moving in the congruent directions with visually induced self-motion were detected more quickly and more accurately than those in the conflicting directions, when sounds were presented in rear space (Teramoto et al., 2006 IMRF). In the present study, we used a rotary chair surrounded with random dots and two loudspeakers attached on either the front or the back of the chair, in order to confirm the phenomenon in a more realistic environment. Observers were asked to judge in which direction a sound appeared to move, leftward or rightward, while being rotated around their vertical axis. The results for the rear space condition were consistent with our previous study. On the other hand, those for the front space condition showed that sounds moving in the conflicting directions with self-motion were detected more accurately. The implications of these results are discussed in light of the contribution of the self-motion mechanisms to auditory spatiotemporal processing
Characteristics of overlap region in high-Reynolds number turbulent channel flow
No full textDirect numerical simulation of the fully developed turbulent channel flows have been carried out at the Reynolds number based on the friction velocity and the channel half width, 2000, 4000 and 8000. A hybrid 10th order accurate finite difference scheme in the stream and spanwise directions, and a second-order scheme in the wall-normal direction is adapted as the spatial discretization method. We observed the plateau profiles in the indicator function corresponded to the von Karman constant. Furthermore, second peak of streamwise pre-multiplied spectra were appeared in the same wall normal height, 300 < y+ < 600, in case of Re = 4000. Nevertheless, the effects of the lager than the channel half height scale on the streamwise turbulent intensity are fixed contributions without dependence on Reynolds number. These results suggested that the new streamwise vortexes are formed between buffer layer and outer layer with increasing of Reynolds number
La 'circunstancia' de 'Herederos y Pretendientes
No full textIn June 2010, the Ortega y Gasset Foundation hosted a Conference about the “Spanish Philosophical Transition” in order to debate the book of Francisco Vázquez, La filosofía española. Herederos y Pretendientes. Una lectura sociológica (1963-1990), recently published. This paper is the author’s response to criticism raised in the Conference and to published reviews received by this book. First, the author summarized the argument of Herederos y pretendientes. Secondly he responds and takes into account the most important objections against the book’s hypothesis and methodology. Finally the author evaluates the favorable judgments received by the book and suggests the limits of the historian’s task.Fundación Ortega y Gasset-Marañó
Antigenic heterogeneity modulation and evolution in breast cancer lesions as defined by monoclonal antibodies
No full textReactivity of a monoclonal antibody (B72.3) with fixed sections of human mammary carcinomas
No full textMonoclonal antibodies to human mammary carcinoma associated antigens and their potential use for diagnosis,prognosis and therapy
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