Linear partial divided-difference equation satisfied by multivariate orthogonal polynomials on quadratic lattices

In this paper, a fourth-order partial divided-difference equation on quadratic lattices with polynomial coefficients satisfied by bivariate Racah polynomials is presented. From this equation we obtain explicitly the matrix coefficients appearing in the three-term recurrence relations satisfied by any bivariate orthogonal polynomial solution of the equation. In particular, we provide explicit expressions for the matrices in the three-term recurrence relations satisfied by the bivariate Racah polynomials introduced by Tratnik. Moreover, we present the family of monic bivariate Racah polynomials defined from the three-term recurrence relations they satisfy, and we solve the connection problem between two different families of bivariate Racah polynomials. These results are then applied to other families of bivariate orthogonal polynomials, namely the bivariate Wilson, continuous dual Hahn and continuous Hahn, the latter two through limiting processes. The fourth-order partial divided-difference equations on quadratic lattices are shown to be of hypergeometric type in the sense that the divided-difference derivatives of solutions are themselves solution of the same type of divided-difference equations.Comment: 36 page

Patterns of anxiety symptoms in toddlers and preschool-age children: Evidence of early differentiation

The degree to which young children’s anxiety symptoms differentiate according to diagnostic groupings is under-studied, especially in children below the age of 4 years. Theoretical (confirmatory factor analysis, CFA) and statistical (exploratory factor analysis, EFA) analytical methods were employed to test the hypothesis that anxiety symptoms among 2–3-year-old children from a non-clinical, representative sample would differentiate in a manner consistent with current diagnostic nosology. Anxiety symptom items were selected from two norm-referenced parent-report scales of child behavior. CFA and EFA results suggested that anxiety symptoms aggregate in a manner consistent with generalized anxiety, obsessive–compulsive symptoms, separation anxiety, and social phobia. Multi-dimensional models achieved good model fit and fit the data significantly better than undifferentiated models. Results from EFA and CFA methods were predominantly consistent and supported the grouping of early childhood anxiety symptoms into differentiated, diagnostic-specific categories

Influence of Flood Pulse on Termite Diversity (INSECTA: ISOPTERA) in the Pantanal

This research aimed to associate termite diversity to flood pulse by Paraguay River, and with savannas and pasture areas. The study was conducted nearby the town of Cáceres, in Pantanal - Mato Grosso, on six livestock farms subject to Paraguay River flood pulse. Types of land use sampled were native savanna and cultivated pasture. Flooded and dry plots were selected, both the savanna and the pasture in each sampling area. Termite richness and abundance was analysed based on the  environments as an explanatory variable (FP – flooded pasture, DP – dry pasture, FS – flooded savanna, DS – dry savanna) through GLM; Tukey’s test was subsequently performed to determine whether land use and/or flood pulse can significantly affect the termite community. There were 37 termite species and 19 genera. Richness and abundance of termite species cannot be explain by flooding pulse, but were explained only by land use (pasture and savanna). The similarity analysis also identified that species composition was quite affected by flood in grazing areas, but this disturbance does not affect the savanna areas. In conclusion, flood pulse is not a determining factor for savannas or pasture termite richness, but change the composition of the termite fauna in the environment

Perspectivas para la biopsicología de la sprimeras décadas del siglo XXI

The paper sketches the potential developments of biopsychology during the beginning of the 21st century from the perspective of the senior author who started his career as a bsiologist and is ending it as a psychologist. The projections are developed along the concept that any act of behaviour or conscience shown by any organism is always the final product of three historical processes: phylogeny, ontogeny and physiogeny. It is argued that the theory of biological evolution, supplemented by the newer theory of cultural evolution, will gain un increasing explanatory role in psychology. Genes, the molecular condensates of phylogeny, will be increasingly recognised as the most important determinant of neural ontogeny. The improved understanding of their action will allow a more precise characterisation of the influence that experience has upon behaviour. The physiogenic accounts of behaviour and conscience will be increasingly based on the description of thefunctioning of neural nets. The complexity of natural neural nets will in turn encourage the study of artificial neural net models. It is recommended that academic psychology should not estrange itself institutionally from what increasingly will be its most important scientific root, biopsychology.El trabajo traza esquemáticamente el probable desarollo de la biopsicologia durante los comienzos del siglo xx desde el punto de vista del primer autor quien comenzó su carrera como biólogo y la está terminando como psicólogo. Las anticipaciones de futuro son desarolladas a partir del concepto de que cualquier acto de conducta o de conciencia de un organismo es siempre el producto final de tres procesos históricos: filogenia, ontogenia y fisiogenia. Se considera que la teoria de la evolución biológica, suplementada por la más novel teoria de la evolución cultural cobrará un creciente valor explicativa en la psicologia. Los genes, como productos moleculares de la filogenia, van a ser progresivamente reconocidos como los más importantes determinantes de la ontogenia neural. La mejorada comprensión de sus acciones ayudará a caracterizar más certeramente la influencia que la experiencia tiene sobre la conducta. Las explicaciónes fisiogénicas del comportamiento y la conciencia se basarán más y más en la descripción del funcionamiento de redes neurales. La complejidad de redes neurales naturales a su vez promoverá el estudio de redes neurales artificiales como modelos. Se recomienda que la psicologia académica no se despegue institucionalmente de lo que será de forma creciente su más importante fundamento científico, la biopscologia

Cartilha - palestra sobre ferrugem asiática da soja.

Esta palestra trata de aspectos da ferrugem asiática da soja: uma doença recente no Brasil e com alto potencial de dano.bitstream/item/56144/1/ID-26146.pd

Density and morphology: from the building scale to the city scale

The density of the domestic building stock of London is explored, moving from the scale of individual house and blocks of flats, through larger geographical units, to complete boroughs. The description of the stock is highly detailed and is made using the 3DStock method, which derives building geometry from digital maps and LiDAR (laser measurements from overflying aircraft). This means that accurate estimates of floor areas can be made and used to measure densities as Floor Space Index (FSI) values. Ground coverage or Ground Space Index (GSI) values are calculated from building footprints and land boundaries. The Spacemate tool, devised by Berghauser Pont and Haupt, is used to plot the types and ages of dwellings in terms of FSI, GSI and numbers of storeys. Figures for actual annual gas and electricity consumption are attached to each dwelling. Analysis shows that, in general, energy-use intensities—and especially the intensity of gas use for heating—decrease with increasing density, and with the transition between house types, from detached, to semi-detached, to terraces, to (low-rise) flats