Learning Bayesian Networks for Student Modeling

In the last decade, there has been a growing interest in using Bayesian Networks (BN) in the student modelling problem. This increased interest is probably due to the fact that BNs provide a sound methodology for this difficult task. In order to develop a Bayesian student model, it is necessary to define the structure (nodes and links) and the parameters. Usually the structure can be elicited with the help of human experts (teachers), but the difficulty of the problem of parameter specification is widely recognized in this and other domains. In the work presented here we have performed a set of experiments to compare the performance of two Bayesian Student Models, whose parameters have been specified by experts and learnt from data respectively. Results show that both models are able to provide reasonable estimations for knowledge variables in the student model, in spite of the small size of the dataset available for learning the parametersUniversidad de Málaga. Campus de Excelencia Internacional Andalucía Tec

A theory that predicts behaviors of disordered cytoskeletal networks.

Morphogenesis in animal tissues is largely driven by actomyosin networks, through tensions generated by an active contractile process. Although the network components and their properties are known, and networks can be reconstituted in vitro, the requirements for contractility are still poorly understood. Here, we describe a theory that predicts whether an isotropic network will contract, expand, or conserve its dimensions. This analytical theory correctly predicts the behavior of simulated networks, consisting of filaments with varying combinations of connectors, and reveals conditions under which networks of rigid filaments are either contractile or expansile. Our results suggest that pulsatility is an intrinsic behavior of contractile networks if the filaments are not stable but turn over. The theory offers a unifying framework to think about mechanisms of contractions or expansion. It provides the foundation for studying a broad range of processes involving cytoskeletal networks and a basis for designing synthetic networks

Claves para la determinación de los pólenes de las principales especies melíferas de la Península Ibérica

This paper presents keys for the identification of 216 plant taxa and pollent types from species known to be melliferous, from other honeydew-producing plants, and from companion and contaminant species.Las claves del presente articulo incluyen 216 taxones vegetales y tipos polinicos de especies meliferas ibéricas, asi como de plantas que producen mielatos y de especies que aparecen como acompañantes y contaminantes en 10s analisis de las mieles

Analysis of reproductive parameters in a dairy farm

PòsterJun

Museu de Anatomia: instrumento de democratização do ensino e da inclusão social

Anais do 35º Seminário de Extensão Universitária da Região Sul - Área temática: EducaçãoIntrodução: Os museus são instituições culturais que possibilitam a ocorrência de conexões entre o saber científico e a sociedade, constituindo um verdadeiro espaço educacional não formal. Infelizmente, muitas vezes, esses espaços não dispõem de características estruturais e/ou de profissionais capacitados para que a Pessoa com Deficiência possa desfrutar dos bens culturais, com sentimento de pertencimento social. Nesse contexto, o Museu de Anatomia se mostra como instrumento de democratização do conhecimento que busca a cada ano implementar medidas para multiplicar as possibilidades de acesso para todos os tipos de visitantes. Objetivo: Descrever o Projeto de Extensão Museu de Anatomia e suas ações na busca pela democratização do ensino e da inclusão social. Metodologia: O Museu de Anatomia é organizado anualmente na forma de exposição temporária, sendo expostas peças anatômicas e réplicas de obras de arte. Na última edição, foram implementadas medidas para possibilitar acessibilidade a Pessoas com Deficiência auditiva, motora ou intelectual, como tradutores de libras, utilização de legendas virtuais (tablets) e atividades interativas e guiadas por tutores treinados. Resultados: Em 2017, o Museu de Anatomia recebeu 6.366 visitantes, acolhendo 79 instituições de ensino regular e especial ao longo de duas semanas de exposição. Considerações finais: o Museu de Anatomia tem cumprido seu papel como instrumento de democratização do ensino e também de inclusão social quando valoriza as diferenças e promove a acessibilidad

Effects of Structural Intellectual Capital on The Innovation Capacity of Public Administration

Structural capital is one of the elements of intellectual capital, and measuring it in local public administration contributes to assessing value for society. This article analyzes the effects of structural intellectual capital on the innovation capacity of public administration in a Latin American city. The research was carried out with civil servants who hold management positions in the City Hall of the researched city. It was used multivariate exploratory analysis, principal component analysis, correlation and linear regression to statistically organize the data. The main results are that structural intellectual capital has a positive, significant and direct influence on the capacity for innovation in public administration. For public managers, the study demonstrated that investment in structural capital can have direct and proportional effects on the ability to innovate in services and processes, organizational and institutional. Therefore, investments in structure, processes, and organizational philosophy in public administration tend to improve managers' ability to innovate. It is important to highlight that structural intellectual capital aligned with innovation has the potential to significantly improve technology, services, processes, and meeting social demands for the local community

Molecular dynamics study of hydrogen atom recombination over silica, based on a new analytical DFT potential energy surface

A new analytical potential energy surface (PES) based on new density functional theory data is constructed for the interaction of atomic hydrogen with both a clean and an H-preadsorbed -cristobalite (001) surface. For the atomic interaction, six adsorption sites have been considered, the Si site (T1') being the most stable one. The PES was developed as a sum of pairwise atom-atom interactions between the gas-phase hydrogen atoms and the Si and O atoms of the -cristobalite surface. A preliminary molecular dynamics semiclassical study of the different heterogeneous processes (e.g., H2 formation via Eley-Rideal reaction, H adsorption) that occur when H collides with an H-preadsorbed beta-cristobalite (001) surface was carried out. The calculations were performed for collisional energy in the range (0.06 ≤ Ekin ≤ 3.0 eV), normal incidence and a surface temperature Tsurf = 1000 K. The recombination probability reaches its maximum value of approximately 0.1 for collisional energies in the range 0.3 ≤ Ekin ≤ 0.8 eV. The H2 molecules are formed in medium-lying vibrational levels, while the energy exchanged with the surface in the recombination process is very low

Plant diversity of a cattle field in the northwest of San Luis (Argentina)

En este trabajo se da a conocer la diversidad de la flora vascular del establecimiento privado "Lomas Blancas", situado en el noroeste de la provincia de San Luis, con mención de las familias y géneros representados, su status, como así también el número y riqueza de especies relevadas según el hábito y estado de conservación.This paper describes the composition of the vascular flora of the private establishment "Lomas Blancas", located in the northwestern of the San Luis province. Families and genera represented, their status, as well as the number and species richness surveyed according to the habit and conservation status are put forward.Fil: Carosio, Maria Cristina. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia; ArgentinaFil: Junqueras, Maria J.. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia; ArgentinaFil: Fernandez Belmonte, María Cecilia. Universidad Nacional de San Luis. Facultad de Ingeniería y Ciencias Económico Sociales. Departamento de Ciencias Agropecuarias; ArgentinaFil: Chiofalo, Sergio David. Universidad Nacional de San Luis. Facultad de Ingeniería y Ciencias Económico Sociales. Departamento de Ciencias Agropecuarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis; ArgentinaFil: Manrique, Marcela A.. Universidad Nacional de San Luis. Facultad de Ingeniería y Ciencias Económico Sociales. Departamento de Ciencias Agropecuarias; Argentin

A molecular dynamics simulation of hydrogen atoms collisions on an H-preadsorbed silica surface

The interaction of hydrogen atoms and molecules with a silica surface is relevant for many research and technological areas. Here, the dynamics of hydrogen atoms colliding with an H-preadsorbed -cristobalite (001) surface has been studied using a semiclassical collisional method in conjunction with a recently developed analytical potential energy surface based on Density Functional Theory (DFT) calculations. The atomic recombination probability via an Eley-Rideal (E-R) mechanism as well as the probabilities for other competitive molecular surface processes have been determined in a broad range of collision energies (0.04-3.0) eV eV) for off-normal (v=45°) and normal (v=0°) incidence and for two different surface temperatures (TS = 300 and 1000 K). H2,gas molecules form in roto-vibrational excited levels while the energy transferred to the solid surface is below of 10% for all simulated conditions. Finally, the global atomic recombination coefficient (E-R) and vibrational state resolved recombination coefficients (v) were calculated and compared with the available experimental values. The calculated collisional data are of interest in chemical kinetics studies and fluid dynamics simulations of silica surface processes in H-based low-temperature, low-pressure plasmas