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Search Results: 1 - 10 of 198550 matches for " Germán RAMALLO ASENSIO "
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Toda la obra conservada en Espa a y hasta ahora conocida, del pintor Segismundo Laire. Alemán en Roma
Ramallo Asensio, Germán
Archivo Espa?ol de Arte , 2006,
Abstract: The author, completing his previous studies of the German painter Segismundo Laire, presents the artist's works preserved in Spain, adding and analyzing new paintings and revising old attributions. Se estudia la obra conservada en Espa a del pintor alemán Segismundo Leire, completando estudios anteriores del autor sobre este pintor, con la aportación y análisis de nuevos cuadros y revisando antiguas atribuciones.
El rostro Barroco de las catedrales espa olas
Cuadernos Dieciochistas , 2009,
Abstract: RESUMEN: El artículo presentado pertenece a un proyecto más amplio sobre el estudio de las catedrales espa olas. En este caso se seguirá el proceso evolutivo que abarca el periodo Barroco, desde principios del siglo XVII hasta finales del siglo XVIII. El estudio se centra en las actuaciones arquitectónicas que se llevan a cabo en algunas catedrales espa olas: Zamora, Murcia, La Seo de Zaragoza, Santiago de Compostela, etc. Se dividen las actuaciones en tres bloques: las de justificación religiosa, las que presentan una funcionalidad directa a las nuevas necesidades del culto y de un cabildo cada vez más refinado y preparado intelectualmente, y, por último, las obras de carácter representativo volcadas hacia el exterior del edificio: fachadas, cierres de claustro y torres. De estos tres bloques el que se sigue aquí es el perteneciente a las fachadas, pero sin renunciar a ninguno de los otros apartados. ABSTRACT: This article is part of a broader project on the study of Spanish cathedrals. Here, we folbow the process of development that covers the Baroque period, from the beginning of the seventeenth century to the end of the eighteenth century. The study focuses on architectural activity carried out on some Spanish cathedrals: Zamora, Murcia, La Seo of Zaragoza, Santiago de Compostela, etc. The activities are divided into three bocks: those with a religious justification, those that have direct functionality for the new needs of the liturgy and an evermore refined and intellectually prepared chapter and, finally, works of a representative nature related to the outside of the building: fa ades, closings of cloister and towers. Of these three blocks, the one followed here is that of the fa ades, without renouncing the other sections.
Analysis of Pseudoreplicants to Evaluate Natural Regeneration after Applying Prescribed Burns in a Temperate Forest of Mexico  [PDF]
José Germán Flore Garnica
Open Journal of Forestry (OJF) , 2012, DOI: 10.4236/ojf.2012.21002
Abstract: Although fire is one of the most important disturbing factors of forest in Mexico, little it is known on the effects of fire on the particular Mexican forest ecosystems. This is remarked for the fact that the effects of fires on vegetation vary among different types of forests. This lack of knowledge has constrained the use of fire, as a silvicultural tool. Therefore, the purpose of this project was to evaluate the effects of fire on regeneration, under burns. This work was carried out in a pine forest stand at Tapalpa Saw in Jalisco State, Mexico, dominated by Pinus michoacana and Pinus oocarpa. The study evaluated the effects of two techniques of prescribed burning: 1) backing, and 2) head fire. The sample plots were burned on 25 and 26 March 1991, before the rain season. One month before and 2 years after burning several measurements were made in order to evaluate the effect of fire on regeneration. Due to the limitations to work with “real” replicates (for treatments an control), original sample units (20 × 30 m) were divided into 5 × 5 m smaller sample units, which were considered as pseudoreplicants. Therefore, such analysis did not avoid introducing systematic error (bias) and minimize random error. Nevertheless, the variability within the pseudoreplicants was considerable in order to assume certain significance of the resulting estimations. Therefore, despite that this was a nonreplicated study; the results suggest strong ecological evidence that prescribed fire enhance natural regeneration of Pinus michoacana and Pinus oocarpa. In general, it is concluded that prescribed burning could be a valuable forest management tool in regions with similar conditions to the study area, in order to improve regeneration. However, further research is needed before prescribed fires can be applied with confidence in many Mexican forest conditions.
Is the Space-Time a Superconductor?  [PDF]
Wenceslao Santiago-Germán
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.410174

At the fundamental level, the 4-dimensional space-time of our direct experience might not be a continuum and discrete quantum entities might “collectively” rule its dynamics. Henceforth, it seems natural to think that in the “low-energy” regime some of its distinctive quantum attributes could, in principle, manifest themselves even at macroscopically large scales. Indeed, when confronted with Nature, classical gravitational dynamics of spinning astrophysical bodies is known to lead to paradoxes: to untangle them, dark matter or modifications to the classical law of gravity are openly considered. In this article, the hypothesis of a fluctuating space-time acquiring “at large distances” the properties of a Bose-Einstein condensate is pushed forward: firstly, it is shown that a natural outcome of this picture is the production of monopoles, dyons, and vortex lines of “quantized” gravitomagnetic—or gyrogravitational—flux along the transition phase; the minimal supported “charge” (and multiples of it) being directly linked with a nonzero (minimal) vacuum energy. Thus, a world of vibrating, spinning, interacting strings whose only elements in their construction are our topological concepts of space and time is envisioned, and they are proposed as tracers of the superfluid features of the space-time: the archetypal embodiment of these physical processes being set by the “gravitational roton”, an analogue of Landau’s classic higher-energy excitation used to explain the superfluid properties of helium II. The far and the near field asymptotics of string line solutions are presented and used to deduce their pair-interaction energy. Remarkably, it is found that two stationary, axis-aligned, quantum space-time vortices with the same sense of spin not only exhibit zones of repulsion but also of attraction, depending on their relative geodetic distance.

Spatial Distribution of Fuel Models Based on the Conditional-Fuel-Loading Concept  [PDF]
José Germán Flores Garnica
Journal of Environmental Protection (JEP) , 2018, DOI: 10.4236/jep.2018.92009
Abstract: Fuel model mapping has followed in general two trends: 1) indirect inferences, where some factors, presumably associated with fuel production, are related to a given fuel model; and 2) experts consulting, which has been used to classify and to validate other people classifications. However, reliance on expert judgment implies a subjective approach. Thus, I propone the integration of geostatistic techniques and the Conditional-Fuels-Loading concept (CFL) to define a more objective perspective in the fuel-model mapping. The information used in this study was collected in a forest of Chihuahua, Mexico, where fuels were inventoried in 554 (1000 m2) sample plots. These sample plots were classified using the CFL; and ordinary kriging (Gaussian, spherical and exponential) was used to interpolate the fuel-model values. Using the Akaike’s Information Criterion the spherical model performed best. The methodology allowed a finer definition of spatial distribution of fuel models. Some advantages of the CFL are: 1) it is based on actual fuel loads, and not only on vegetation structure and composition; 2) it is objective and avoids the bias of different classifiers (experts); and 3) it avoids the need of the advice of experts.
Structure and Density Analysis of a Semi Desert Ecosystem Disturbed by Fire  [PDF]
José Germán Flores Garnica
Open Journal of Forestry (OJF) , 2018, DOI: 10.4236/ojf.2018.82011
Abstract: In Mexico, forest ecosystems are disturbed by fires and generally these are considered to have negative impacts. However, it is important to consider that fire is an element of these ecosystems, and is important for its functionality. So it should be understood that in many cases the effects of a forest fire are beneficial, which can be determined through studies of population dynamics of these ecosystems. However, most of these studies currently focused only on aspects of species composition, with few cases concerning the analysis of the structure and density. In this study, a comparative analysis of the vegetation showed that conditions prevailing between burned and unburned areas of a site covered by microphyll desert species (shrubs and mesquite). The results suggest that the structure and density conditions of vegetation between burned and unburned areas are not statistically different. This is highlighted because one year after the fire occurred there is no evidence that fire had altered the structure and density of vegetation. Moreover, both in burned and unburned areas, vegetation had a healthy condition. Finally, although this may suggests that the fire was of low intensity, which resulted in a low impact on vegetation, in future studies it is recommended to determine if the same results are observed under different possible fire behavior and intensity.
Critical temperatures for superconducting phase-coherence and condensation in La2-xSrxCuO4
N. Coton,M. V. Ramallo,F. Vidal
Physics , 2013,
Abstract: A pivotal ongoing debate about cuprate superconductors (HTS) is the location of the transition temperatures for the superconducting wave function phase coherence and condensation, Tphase and Tcond. This shall elucidate which of two very different interactions dictate the macroscopic superconducting phase diagram of HTS: either those between normal-state carriers or those between preformed vortices and antivortices. Here, we present unambiguous experimental determinations of Tphase and Tcond in the prototypical HTS La2-xSrxCuO4 as a function of the doping level x. Tphase is measured as a sharp change in the exponent alpha of the voltage-current characteristics (V proportional to I^alpha). Tcond is determined from the critical rounding of the ohmic resistivity above Tphase. Our measurements indicate that the transition to macroscopic superconductivity is accompanied by phase coherence due to vortex-antivortex binding and also that, for all x, Tcond lies only a few Kelvin above Tphase, limiting then the shift of the transition due to vortex-antivortex correlations.
An Inexact Restoration Package for Bilevel Programming Problems  [PDF]
Elvio A. Pilotta, Germán A. Torres
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.330181
Abstract: Bilevel programming problems are a class of optimization problems with hierarchical structure where one of the con-straints is also an optimization problem. Inexact restoration methods were introduced for solving nonlinear programming problems a few years ago. They generate a sequence of, generally, infeasible iterates with intermediate iterations that consist of inexactly restored points. In this paper we present a software environment for solving bilevel program-ming problems using an inexact restoration technique without replacing the lower level problem by its KKT optimality conditions. With this strategy we maintain the minimization structure of the lower level problem and avoid spurious solutions. The environment is a user-friendly set of Fortran 90 modules which is easily and highly configurable. It is prepared to use two well-tested minimization solvers and different formulations in one of the minimization subproblems. We validate our implementation using a set of test problems from the literature, comparing different formulations and the use of the minimization solvers.
Patogenecidad de agrobacterium tumefaciens en algunas especies de plantas de flóres de exportación
Ovalle Germán,Benincore Germán,Arbeláez Germán
Agronomía Colombiana , 1984,
Abstract: Tres aislamientos de tumefaelens Agrobaeterlum de rosa de las plantas afectadas con agalla de la corona en la Sabana de Bogotá se han caracterizado e identificado por pruebas de laboratorio y mediante la inoculación en plantas de tomate, zanahoria y remolacha. Patogenicidad fue probado en el campo de rosas, claveles, limonium, chrysanthermum y plantas gipsophila que son especies importantes en el país para la producción de flores de exportación. Su patogenia se ha probado también en las plantas de eucaliptus, remolacha, tomate y geranio, anfitriones común de las bacterias, estas pruebas se llevaron a cabo en 45 plantas de día y el material de propagación. Los aislamientos fueron altamente patógena de plantas de rosa y eucallptus, moderadamente patógenas de clavel y de hielo y estadísticas presentados pathogeneclty muy bajo en chrysanthemun. No hubo infección en gypsophila. Las plantas de tomate, la remolacha y el geranio presente una alta susceptibilidad a la bacteria y pueden ser de gran utilidad para el diagnóstico. Three isolates of Agrobaeterlum tumefaelens from rose plants affected with crown gall in the Savanna of Bogota have been characterized and identified by laboratory test and by inoculation in tomato plants, carrot and beet root disks. Pathogenecity was tested in the field on rose, carnation, statice, chrysanthermum and gipsophila plants which are important species in the country for the production of export flowers. Their pathogenecity was also tested on eucaliptus, beet, tomato and geranium plants, common hosts of the bacteria; these tests were carried out on 45 days old plants and propagation material. The isolates were highly pathogenic on rose and eucallptus plants, moderately pathogenic on carnation and stat ice and presented very low pathogeneclty on chrysanthemun. There was no Infection on gypsophila. Tomato, beet and geranIum plants present high susceptibility to the bacteria and can be of great usefuiness for the diagnosis of the disease.
Hepatocellular carcinoma in cirrhotic liver CT an MRI findings
Germán Castrillón
Iatreia , 2007,
Abstract: For all practical purposes, you should consider cirrhosis to be a pre-malignant condition. This means that a patient with cirrhosis is at risk for developing hepatocellular carcinoma (HCC). The greater or lesser risk depends on the etiology of the cirrhosis. There are a lot of complications of cirrhosis, but the most dreaded one is hepatocellular carcinoma. I am going to do a brief review of cirrhosis and then I will talk about the HCC that is the focus of this review.
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