Effects of biasing on the galaxy power spectrum at large scales

n this paper we study the effect of biasing on the power spectrum at large scales. We show that even though non-linear biasing does introduce a white noise contribution on large scales, the $P(k)\propto k^n$ behavior of the matter power spectrum on large scales may still be visible and above the white noise for about one decade. We show, that the Kaiser biasing scheme which leads to linear bias of the correlation function on {\em large} scales, also generates a linear bias of the {\rm power spectrum} on rather small scales. This is a consequence of the divergence on small scales of the pure Harrison-Zeldovich spectrum. However, biasing becomes k-dependent when we damp the underlying power spectrum on small scales. We also discuss the effect of biasing on the baryon acoustic oscillations.Comment: 9 pages, 4 figures. One figure and comments clarifying the linear biasing on small scales and references added. V3 version accepted in PR

Compared perspectives among faculty members of postgraduate school at UNAM and UCM

El propósito de este estudio es indagar las principales características del buen docente universitario de posgrados de investigadores en educación para poder construir una perspectiva desde la que analizar la calidad de la formación que imparten. El aporte original frente a otros estudios que han tratado cuestiones similares es que, en este caso, la muestra utilizada en la investigación está constituida por docentes de los posgrados de dos de las universidades más importantes de Iberoamérica. La metodología se basó en una estrategia de estudio de casos múltiples, para lo cual se utilizó un cuestionario de preguntas abiertas que se pasó a docentes de dichos posgrados. Los resultados muestran el predominio de la competencia cognitiva en la caracterización del buen docente, así como en las ideas sobre cómo llegar a serlo, mientras que en sus recomendaciones para mejorar el trabajo académico se subrayó la importancia de la competencia social. En las conclusiones se cuestiona el hecho de que en el posgrado se esté dando tanta importancia a la Competencia cognitiva, cuando a nivel mundial se está pidiendo replantear la educación considerando criterios humanísticos sensibles a las necesidades sociales, más afines con la Competencia ética y la Competencia socialThis study has the purpose of researching the main characteristics of the good university professor of postgraduates for educational researchers in order to build a perspective of the quality of the training they teach. The main difference with similar researches is that, in this case, the study used a pool of graduate school teachers from two of the most important universities of Latin America and Spain. The methodology for this research was based on a multiple case study strategy, with a questionnaire designed for this purpose, which was given to faculty members of graduate school at the UNAM and the UCM. Results show a high incidence in cognitive competence as a key feature to recognize a good teacher, as well as for how to become one of them. Faculty members also recommended focusing on social competence when trying to improve academic work. The conclusions question the fact that the postgraduate level is giving so much importance to Cognitive competence, when at a global level, it is being asked to rethink education considering humanistic criteria sensitive to social needs, more akin to Ethical competence and Social competenc

An accelerated MDM algorithm for SVM training

This is an electronic version of the paper presented at the 16th European Symposium on Artificial Neural Networks, held in Bruges on 2018In this work we will propose an acceleration procedure for the Mitchell–Demyanov–Malozemov (MDM) algorithm (a fast geometric algorithm for SVM construction) that may yield quite large training savings. While decomposition algorithms such as SVMLight or SMO are usually the SVM methods of choice, we shall show that there is a relationship between SMO and MDM that suggests that, at least in their simplest implementations, they should have similar training speeds. Thus, and although we will not discuss it here, the proposed MDM acceleration might be used as a starting point to new ways of accelerating SMO.With partial support of Spain’s TIN 2004–07676 and TIN 2007–66862 projects. The first author is kindly supported by FPU-MEC grant reference AP2006-02285

On the Design of Ambient Intelligent Systems in the Context of Assistive Technologies

The design of Ambient Intelligent Systems (AISs) is discussed in the context of assistive technologies. The main issues include ubiquitous communications, context awareness, natural interactions and heterogeneity, which are analyzed using some examples. A layered architecture is proposed for heterogeneous sub-systems integration with three levels of interactions that may be used as a framework to design assistive AISs.Ministerio de Ciencia y Tecnología TIC2001-1868-C0

Producción de biocombustible sólido a partir de tocones de eucalipto (Eucalyptus globulus) procedentes de restauración de zonas incendiadas

En el marco de los trabajos de restauración de una zona incendiada, se ha procedido al desembosque de tocones de eucalipto blanco (Eucalyptus globulus) con dos procedimientos distintos. Una vez en cargadero se han procesado mediante una trituradora de martillos y la astilla resultante se ha analizado, tanto en sus características físicas como en su composición química.____________________________________Within the framework of restoration tasks in a burnt area, white eucalyptus stumps were taken off from the forest through two different processes. These residues have been processed by a hammer grinder, and the resulting ground wood has been analyzed both in his physical characteristics and chemical composition

Evidence of Different Thermoregulatory Mechanisms between Two Sympatric Scarabaeus Species Using Infrared Thermography and Micro-Computer Tomography

In endotherms insects, the thermoregulatory mechanisms modulate heat transfer from the thorax to the abdomen to avoid overheating or cooling in order to obtain a prolonged flight performance. Scarabaeus sacer and S. cicatricosus, two sympatric species with the same habitat and food preferences, showed daily temporal segregation with S. cicatricosus being more active during warmer hours of the day in opposition to S. sacer who avoid it. In the case of S. sacer, their endothermy pattern suggested an adaptive capacity for thorax heat retention. In S. cicatricosus, an active ‘heat exchanger’ mechanism was suggested. However, no empirical evidence had been documented until now. Thermographic sequences recorded during flight performance showed evidence of the existence of both thermoregulatory mechanisms. In S. sacer, infrared sequences showed a possible heat insulator (passive thermal window), which prevents heat transfer from meso- and metathorax to the abdomen during flight. In S. cicatricosus, infrared sequences revealed clear and effective heat flow between the thorax and abdomen (abdominal heat transfer) that should be considered the main mechanism of thermoregulation. This was related to a subsequent increase in abdominal pumping (as a cooling mechanism) during flight. Computer microtomography scanning, anatomical dissections and internal air volume measurements showed two possible heat retention mechanisms for S. sacer; the abdominal air sacs and the development of the internal abdominal sternites that could explain the thermoregulation between thorax and abdomen. Our results suggest that interspecific interactions between sympatric species are regulated by very different mechanisms. These mechanisms create unique thermal niches for the different species, thereby preventing competition and modulating spatio-temporal distribution and the composition of dung beetle assemblages

On the presence of Trachinus pellegrini (Trachinidae) in the Canary and Cape Verde Islands (north-eastern Atlantic)

Présence de Trachinus pellegrini (Trachinidae) aux îles Canaries etCanaries et aux îles du Cap-Vert (Atlantique nord-est). Trachinus pellegrini Cadenat, 1937 est signalée pour la première fois aux îles Canaries, ce qui représente sa limite de répartition la plus septentrionale. Les différences morphologiques entre adultes et juvéniles sont également présentées. La présence de cette espèce aux îles du Cap-Vert est aussi confirmée.Postprin

New CMOS VLSI Linear Self-Timed Architectures

The implementation of digital signal processor circuits via self-timed techniques is currently a valid altemative to solve some problems encountered in synchronous VLSI circuits. However; a main difference between synchronous and asynchronous circuits is the hardware resources needed to implement asynchronous circuits. This communication presents four less-costly alternatives to a previously reported linear selftimed architecture, and their application in the design of FIFO memories. Furthermore, the integration and characterization in the laboratory of prototypes of these FIFOs are presented