El pistachero II: Estudio fenológico y económico

10 páginas, tablas estadísticas y figuras.El pistachero es capaz de sobrevivir y dar frutos en situaciones adversas, intolerables para la mayor parte de los frutales. Sin embargo también tiene unos condicionamientos de medio bastantes específicos que limitan su posible área de cultivo, como son las necesidades en frío para cubrir adecuadamente su periodo de reposos invernal, la sincronía en la floración de machos y hembras para tener una buena polinización y sensibilidad a las heladas tardías de primavera. Con los resultados obtenidos en este trabajo y en el trabajo presentado en este VI Congreso de la SEAE “El pistachero I: Estudio de variedades en secano y en manejo ecológico”, se realiza un estudio de viabilidad económica. Se recomienda que a la hora de hacer una nueva plantación, se incluya en la misma diferentes variedades hembras y machos. Las variedades hembras con las que se han obtenido mejores resultados son: Avdat, Ashoury y Larnaka, y como polinizadores: C-especial, Askar, Nazar, Chico y Mateur. Las variedades recomendadas, tienen unas necesidades cercanas a las 1.000 horas-frío para el inicio de la actividad vegetativa y la floración es en la primera quincena de abril. En el estudio económico y considerando que sólo uno de cada tres años se obtiene producción, debido a problemas de heladas de primavera o por veceria, se pueden obtener una rentabilidad económica, a partir de los veinte años, superior a los 600 €, lo que le permite ser una buena alternativa para algunas zonas del secano españolPeer reviewe

Hybrid adaptive control of a dragonfly model

Dragonflies show unique and superior flight performances than most of other insect species and birds. They are equipped with two pairs of independently controlled wings granting an unmatchable flying performance and robustness. In this paper, it is presented an adaptive scheme controlling a nonlinear model inspired in a dragonfly-like robot. It is proposed a hybrid adaptive (HA) law for adjusting the parameters analyzing the tracking error. At the current stage of the project it is considered essential the development of computational simulation models based in the dynamics to test whether strategies or algorithms of control, parts of the system (such as different wing configurations, tail) as well as the complete system. The performance analysis proves the superiority of the HA law over the direct adaptive (DA) method in terms of faster and improved tracking and parameter convergence

Application of fractional algorithms in the control of a robotic bird

In this paper, it is studied the dynamics of the robotic bird in terms of time response and robustness. It is analyzed the wing angle of attack and the velocity of the bird, the tail influence, the gliding flight and the flapping flight. The results are positive for the construction of flying robots. The development of computational simulation based on the dynamic of the robotic bird should allow testing strategies and different algorithms of control such as integer and fractional controllers

Influence of aluminum doping on the properties of LiCoO2 and LiNi0.5Co0.5O2 oxides

We have prepared LiCo1−yAlyO2 and LiNi0.5−yAlyCo0.5O2 (0≤y≤0.3) powder samples by a low temperature sol–gel method using succinic acid as chelating agent. We have studied the details of their crystallographic and local structure by X-ray diffraction (XRD) and FTIR spectroscopy, respectively; we have analyzed their chemical composition by ICP and obtained information about the morphology of the polycrystalline particles by SEM. Also, we have studied the electrochemical performance of the as-prepared materials in the LiLiNi0.5−yAlyCo0.5O2 cells cycled in the potential range 2.5–4.2 V finding that the overall capacity of the oxides has been reduced due to the metal substitution. For example, at 4.2 V cut-off, the charge capacity of the LiLiNi0.35Al0.15Co0.5O2 cell is ca. 115 mA h/g. However, more stable charge–discharge cycling performances have been obtained as compared to those displayed by the native oxides. Finally, we have characterized the kinetics of Li-diffusion by the galvanostatic intermittent titration technique and, according to our results, Al substitution provides an increase in the chemical diffusion coefficients of Li ions in the LiNi0.5−yAlyCo0.5O2 matrix.Spanish and French Foreing Office; PAI Picasso 00717TCSpanish and French Foreing Office; HF 1999-010

A fuzzified systematic adjustment of the robotic Darwinian PSO

The Darwinian Particle Swarm Optimization (DPSO) is an evolutionary algorithm that extends the Particle Swarm Optimization using natural selection to enhance the ability to escape from sub-optimal solutions. An extension of the DPSO to multi-robot applications has been recently proposed and denoted as Robotic Darwinian PSO (RDPSO), benefiting from the dynamical partitioning of the whole population of robots, hence decreasing the amount of required information exchange among robots. This paper further extends the previously proposed algorithm adapting the behavior of robots based on a set of context-based evaluation metrics. Those metrics are then used as inputs of a fuzzy system so as to systematically adjust the RDPSO parameters (i.e., outputs of the fuzzy system), thus improving its convergence rate, susceptibility to obstacles and communication constraints. The adapted RDPSO is evaluated in groups of physical robots, being further explored using larger populations of simulated mobile robots within a larger scenario

Explorando...: a complexidade do corpo humano: guião didáctico para professores: 1º ciclo

O presente livro faz parte da Coleção “Ensino Experimental das Ciências”, um conjunto de textos concebidos para apoiar a formação de professores(as) com vista à generalização do ensino das Ciências no 1.º Ciclo do Ensino Básico (CEB). Trata-se de um livro de suporte à Educação em Ciências para os primeiros níveis de escolaridade desenvolvido tendo por base orientações recentes a nível nacional e internacional

a quantitative approach

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