Association between simple sequence repeat-rich chromosome regions and intergenomic translocation breakpoints in natural populations of allopolyploid wild wheats

Aegilops biuncialis y Aegilops geniculata son dos especies silvestres alotetraploides, con genomios UM, que constituyen un importante reservorio de genes de interés para la mejora del trigo. En este estudio se ha analizado la distribución cromosómica de diferentes secuencias de tipo microsatélites (?single sequence repeat?, SSR) y su relación con las translocaciones intergenómicas U/M, frecuentes en accesiones de ambas especies. En la mayoría de los cromosomas U y en algunos M, se ha localizado una única señal pericéntromérica de la secuencia (ACG)n, mientras que la secuencia (GAA)n aparece como grandes ?clusters? de localización pericentromérica y, en ocasiones, intersticial. En las 5 accesiones portadoras de translocaciones U/M analizadas, se ha comprobado una asociación estadísticamente significativa entre el punto de rotura-reunión de la reordenación y regiones cromosómicas ricas en secuencias SSR.

A simple approach to distributed objects in prolog

We present the design of a distributed object system for Prolog, based on adding remote execution and distribution capabilities to a previously existing object system. Remote execution brings RPC into a Prolog system, and its semantics is easy to express in terms of well-known Prolog builtins. The final distributed object design features state mobility and user-transparent network behavior. We sketch an implementation which provides distributed garbage collection and some degree of tolerance to network failures. We provide a preliminary study of the overhead of the communication mechanism for some test cases.

html.pl: A simple HTML package for Prolog and CLP systems

We describe a simple, public domain, HTML package for LP/CLP systems. The package allows generating HTML documents easily from LP/CLP systems, including HTML forms. It also provides facilities for parsing the input provided by HTML forms, as well as for creating standalone form handlers. The purpose of this document is to serve as a user's manual as well as a short description of the capabilities of the package. The package was originally developed for SICStus Prolog and the UPM &-Prolog/CIAO systems, but has been adapted to a number of popular LP/CLP systems. The document is also a WWW/HTML primer, containing sufficient information for developing medium complexity WWW applications in Prolog and other LP and CLP languages.

A simple genetic algorithm for calibration of stochastic rock discontinuity networks

Este artículo propone un método para llevar a cabo la calibración de las familias de discontinuidades en macizos rocosos. We present a novel approach for calibration of stochastic discontinuity network parameters based on genetic algorithms (GAs). To validate the approach, examples of application of the method to cases with known parameters of the original Poisson discontinuity network are presented. Parameters of the model are encoded as chromosomes using a binary representation, and such chromosomes evolve as successive generations of a randomly generated initial population, subjected to GA operations of selection, crossover and mutation. Such back-calculated parameters are employed to make assessments about the inference capabilities of the model using different objective functions with different probabilities of crossover and mutation. Results show that the predictive capabilities of GAs significantly depend on the type of objective function considered; and they also show that the calibration capabilities of the genetic algorithm can be acceptable for practical engineering applications, since in most cases they can be expected to provide parameter estimates with relatively small errors for those parameters of the network (such as intensity and mean size of discontinuities) that have the strongest influence on many engineering applications.

Hydrothermal waves and corotating rolls in laterally heated convection in simple liquids.

The stability of a liquid layer with an undeformable interface open to the atmo- sphere, subjected to a horizontal temperature gradient, is theoretically analysed. Buoyancy and surface tension forces give rise to a basic flow for any temperature dif- ference applied on the system. Depending on the liquid depth, this basic flow is desta- bilised either by an oscillatory instability, giving rise to the so-called hydrothermal waves, or by a stationary instability leading to corotating rolls. Oscillatory perturba- tions are driven by the basic flow and therefore one must distinguish between convec- tive and absolute thresholds. The instability mechanisms as well as the di¿erent re- gimes observed in experiments are discussed. The calculations are performed for a fluid used in recent experiments, namely silicone oil of 0.65 cSt ðPr 1?4 10Þ. In partic- ular, it is shown that two branches of absolute instability exist, which may be related to the two types of hydrothermal waves observed experimentally

La tecnología es la causa, todo cambia nada es simple

A todos nos ocurre que ciertas frases tópicas nos ponen de los nervios. En mi caso particular, mi sistema nervioso tiende a turbarse al oír expresiones tales como "todo está ya inventado", "en el fondo, las cosas son siempre iguales", o "la historia siempre se repite", que pertenecen a la familia de latiguillos al servicio de la idea de que nunca hay cambios,sino sólo apariencia de cambios.

Comparison of particle dispersion obtained with simple stochastic models and les in pipe flow

A hybrid Eulerian-Lagrangian approach is employed to simulate heavy particle dispersion in turbulent pipe flow. The mean flow is provided by the Eulerian simulations developed by mean of JetCode, whereas the fluid fluctuations seen by particles are prescribed by a stochastic differential equation based on normalized Langevin. The statistics of particle velocity are compared to LES data which contain detailed statistics of velocity for particles with diameter equal to 20.4 µm. The model is in good agreement with the LES data for axial mean velocity whereas rms of axial and radial velocities should be adjusted.

Análisis del sistema profesor-clase con ayuda del modelo más simple de sistema realimentado

Acepto aquí como definición que "un sistema es una combinación de elementos reunidos para obtener un cierto resultado". El sistema que me propongo analizar es el formado por un profesor y un conjunto de alumnos que se reúnen con el objetivo muy determinado de tratar de adquirir unos ciertos conocimientos

Effect of target change during the simple attack in fencing

BIOMECANBICA DE LA ESGRIMA

Energy Storage Systems for Electric Vehicles: Performance Comparison based on a Simple Equivalent Circuit and Experimental Tests

The decision to select the most suitable type of energy storage system for an electric vehicle is always difficult, since many conditionings must be taken into account. Sometimes, this study can be made by means of complex mathematical models which represent the behavior of a battery, ultracapacitor or some other devices. However, these models are usually too dependent on parameters that are not easily available, which usually results in nonrealistic results. Besides, the more accurate the model, the more specific it needs to be, which becomes an issue when comparing systems of different nature. This paper proposes a practical methodology to compare different energy storage technologies. This is done by means of a linear approach of an equivalent circuit based on laboratory tests. Via these tests, the internal resistance and the self-discharge rate are evaluated, making it possible to compare different energy storage systems regardless their technology. Rather simple testing equipment is sufficient to give a comparative idea of the differences between each system, concerning issues such as efficiency, heating and self-discharge, when operating under a certain scenario. The proposed methodology is applied to four energy storage systems of different nature for the sake of illustration.

Coeficientes de presión intersticial en el aparato de corte simple = Pore pressure coefficients for simple shear test

La actuación de cargas sobre un suelo saturado, produce, en función de la naturaleza de la solicitación, del tipo de suelo y de las condiciones de drenaje del terreno, un incremento de la presión sobre el agua de los intersticios. Se ha abordado el estudio de la generación de dicha presión intersticial a partir de muestras de suelo blando, normalmente consolidadas, procedentes del subsuelo del Puerto de Barcelona. Para ello se han utilizado los datos de una completa campaña experimental utilizando la máquina de ensayo de corte simple, y tras la adecuada interpretación del ensayo, se identifican los aspectos que se consideran clave para el proceso de generación de presión intersticial en el suelo, según las diferentes situaciones de carga actuante. Como conclusión, se plantea la generalización de la clásica ecuación que Skempton formuló hace casi 60 años y que permite interpretar la generación de presión intersticial para el aparato de ensayo triaxial. ncrease in pore pressure depending on the nature of the excitation, the type of soil and the drainage conditions of the ground are generated by loads acting on a saturated soil. It has approached the study of the generation of the pore pressure from usually consolidated soft soil samples from the basement of the Port of Barcelona. Data from an adequate experimental campaign using simple shear machine have been used, and the aspects that are considered key to the process of generation of pore pressure in the soil under different loading conditions acting have been identified. In conclusion, the generalization of Skempton's classical equation (formulated almost 60 years ago) and the interpretation of the pore pressure generation for triaxial test apparatus have been proposed.

Simply, simple. Sobre la butaca de Claesson, Roivisto y Rune para David Design, Falsterbo.

Simply, simple. Sobre la butaca de Claesson, Roivisto y Rune para David Design, Falsterbo.

Bóvedas tabicadas de doble y simple curvatura

Bóvedas tabicadas de doble y simple curvatura

Coeficientes de presión intersticial para suelos blandos en el aparato de corte simple

La actuación de cargas sobre un suelo saturado, produce, en función de la naturaleza de la solicitación, del tipo de suelo y de las condiciones de drenaje del terreno, un incremento de la presión sobre el agua de los intersticios. Se ha abordado el estudio de la generación de dicha presión intersticial a partir de muestras de suelo blando, normalmente consolidadas, procedentes del subsuelo del Puerto de Barcelona; para ello, se ha realizado una campaña experimental utilizando la máquina de ensayo de corte simple, y tras la adecuada interpretación del ensayo, se identifican los aspectos que se consideran clave para el proceso de generación de presión intersticial en el suelo, según las diferentes situaciones de carga actuante. Como conclusión, se plantea la generalización de la clásica ecuación que Skempton formuló hace casi 60 años para el aparato de ensayo triaxial.

A simple torsion-free nonlinear beam element for multibody dynamics

We propose in this work a very simple torsion-free beam element capable of capturing geometrical nonlinearities. The simple formulation is objective and unconditionally con- vergent for geometrically nonlinear models with large displacements, in the traditional sense that guarantees more precise numerical solutions for finer discretizations. The formulation does not employ rotational degrees of freedom, can be applied to two and three-dimensional problems, and it is computationally very efficient.