Reasonable Non-conventional Generator of Random Linear Chains Based on a Simple Self-avoiding Walking Process: A Statistical and Fractal Analysis

Models based on self-excluded walks have been widely used to generate random linear chains. In this work, we present an algorithm capable of generating linear strings in two and three dimensions, in a simple and efficient way. The discrete growth process of the chains takes place in a finite time, in a network without pre-established boundary conditions and without the need to explore the entire configurational space. The computational processing time and the length of the strings depending on the number of trials N′ . This number is always less than the real number of steps in the chain, N. From the statistical analysis of the characteristic distances, the radius of gyration ( Rg ), and the end-to-end distance ( Ree ), we make a morphological description of the chains and we study the dependence of this quantities on the number of steps, N. The universal critical exponent obtained are in very good agreement with previous values reported in literature. We also study fractal characteristics of the chains using two different methods, Box-Counting Dimension or Capacity Dimension and Correlation Dimension. The studies revealed essential differences between chains of different dimensions, for the two methods used, showing that three-dimensional chains are more correlated than two-dimensional chains

Structural Characterization of Linear Three-Dimensional Random Chains: Energetic Behaviour and Anisotropy

In this work, we will make an energetic and structural characterization of three-dimensional linear chains generated from a simple self-avoiding random walk process in a finite time, without boundary conditions, without the need to explore all possible configurations. From the analysis of the energy balance between the terms of interaction and bending (or correlation), it is shown that the chains, during their growth process, initially tend to form clusters, leading to an increase in their interaction and bending energies. Larger chains tend to “escape” from the cluster when they reach a number of “steps” N>∼1040 , resulting in a decrease in their interaction energy, however, maintaining the same behavior as flexion energy or correlation. This behavior of the bending term in the energy allows distinguishing chains with the same interaction energy that present different structures. As a complement to the energy analysis, we carry out a study based on the moments of inertia of the chains and their radius of gyration. The results show that the formation of clusters separated by “tails” leads to a final “prolate” structure for this type of chain, the same structure evident in real polymeric linear chains in a good solvent

Path Planning Approach for a Quadrotor Unmanned Aerial Vehicle

A path planning method for an unmanned aerial system type quadrotor is proposed in this work. It is based on Dubins curves. Therefore, different points (initial and ending) are set for generation of several paths. Additionally, to validate the proposed model a computational resource is applied. Also, some flight dynamics limits and orientation angles computations are considered to be able to determine a simplified Dubins model. Dubins paths are commonly divided into low, medium and high altitude gains. It will depend on the altitude established for the start and end points and other configurations

Análisis biocinemática de la fase de vuelo de un volteo simple extendido adelante con medio giro de los gimnastas hombres de la selección Colombia con rueda alemana

This article shows a biokinematic analysis of the simple extended forward turning exercise with ½ turn, of the jumping discipline of German wheel gymnastics. For the development of the present study, recordings were made of 60 gymnastic jumps executed by three Colombian Selection gymnasts and one Swiss Selection gymnast. After this process, the biokinematic variables exit angle and rotation angle were evaluated using the Kinovea software version 0.8.15. The data found were analyzed with the SPSS software version 24, the descriptive results of the statistical mean value were plotted and statistically correlated allowing to validate that an exit angle that oscillates between 24º and 27º and a rotation angle close to the 180º, are the factors that determine an adequate technical execution of the simple turn extended forward with ½ turn. Finally, these findings provide training elements to add a ½ turn to the gymnastic element analyzed, thus allowing a Colombian gymnast to occupy sixth place in the German wheel gymnastics world championships, which took place in Switzerland in 2018.El presente artículo muestra un análisis biocinemático del ejercicio volteo simple extendido adelante con medio giro, perteneciente a la disciplina de salto de la gimnasia con rueda alemana. Para el desarrollo del presente estudio se realizaron las grabaciones de 60 saltos gimnásticos ejecutados por tres gimnastas de la selección colombiana y un gimnasta de la selección suiza. Posterior a este proceso, se evaluaron las variables biocinemáticas ángulo de salida y ángulo de rotación, utilizando el software Kinovea, versión 0.8.15. Los datos hallados se analizaron con el software SPSS, versión 24. Los resultados descriptivos del valor de la media estadística se graficaron y se correlacionaron estadísticamente, lo que permitió validar que un ángulo de salida que oscile entre los 24º y los 27º y un ángulo de rotación cercano a los 180º son los factores que determinan una adecuada ejecución técnica del volteo simple extendido adelante con medio giro. Finalmente, estos hallazgos brindaron elementos al entrenamiento para adicionar un medio giro al elemento gimnástico analizado y permitieron así que un gimnasta colombiano ocupara el sexto puesto en el Campeonato Mundial de Gimnasia con Rueda Alemana, que se llevó a cabo en Suiza durante 2018

Internet of things applied to aquifer monitoring systems: a survey

The interaction between the oceanic and continental basins has been of general interest among the scientific community of multiple disciplines, from the physical perspective of how the interaction of fresh and salt waters mutually modulate their hydrodynamic behavior, and how this in turn determines the transport of sediments, nutrients and other tracers, in addition to inducing changes in the morphodynamics of the river and / or coastal-oceanic zone. Due to the importance of technology for the prevention of different environmental phenomena, this article aims to show the systematic review of the literature about different applications that allow software and hardware interaction to support decision making in the sense of aquifers

Bayesian Classifiers in Intrusion Detection Systems

To be able to identify computer attacks, detection systems that are based on faults are not dependent on data base upgrades unlike the ones based on misuse. The first type of systems mentioned generate a knowledge pattern from which the usual and unusual traffic is distinguished. Within computer networks, different classification traffic techniques have been implemented in intruder detection systems based on abnormalities. These try to improve the measurement that assess the performance quality of classifiers and reduce computational cost. In this research work, a comparative analysis of the obtained results is carried out after implementing different selection techniques such as Info.Gain, Gain ratio and Relief as well as Bayesian (Naïve Bayes and Bayesians Networks). Hence, 97.6% of right answers were got with 13 features. Likewise, through the implementation of both load balanced methods and attributes normalization and choice, it was also possible to diminish the number of features used in the ID classification process. Also, a reduced computational expense was achieved

OpenFOAM Numerical Simulations with Different Lid Driven Cavity Shapes

The finite volume method have been developed to solve the Navier-Stokes equations with primitive variables and non dimensional form. This work examine the classical benchmark problem of the lid-driven cavity at a different Reynolds range (Re = 10,100,400, 1000, 2000, 3200) and several cavity geometries. The cavity configurations include square cavity, skewed cavity, trapezoidal cavity and arcshaped cavity. The flow is assumed laminar and solved in a uniform mesh. A CFD tool with its solvers (icoFoam) will be used for this study

Modelo semi-mecanístico de un proceso de deshidratación osmótica

Magíster en Ingeniería EléctricaMaestrí

Construcción de un prototipo para experimentos de mecánica

The measurement of the time and the space crossed by a moving body allow from the scope of the kinematics to determine magnitudes like the displacement, speed and acceleration; these magnitudes have direct relation with dynamics and theorem of energy conservation. This article shows a mechanical system that consists of a base and a vertical axis that a rail maintains. In the ends of the rail have been prepared two Photogates for measurement of time intervals. The Photogates have been designed and constructed electronically. The prototype is of low cost and is used for measurements in kinematics and dynamics of translation , theorem of energy conservation and rotation dynamics in laboratories and projects of mechanics. The intention of this work is to give to know the prototype and to indicate the different scopes from level laboratory and projects where it can be used.La medición del tiempo y el espacio recorrido por un móvil permiten desde el ámbito de la cinemática determinar magnitudes como el desplazamiento, velocidad y aceleración; estas magnitudes tienen directa relación con la dinámica y el teorema de conservación de energía. Este artículo presenta un sistema mecánico que consta de una base y un eje vertical que sostiene un riel. En los extremos del riel se han acondicionado dos fotocompuertas para medición de intervalos de tiempo. Las fotocompuertas han sido diseñadas y construidas a nivel electrónico. El prototipo es de bajo costo y es utilizado para mediciones o a nivel de cinemática y dinámica de traslación, teorema de conservación de energía y dinámica de rotación en laboratorios de mecánica y proyectos de mecánica. El propósito de este trabajo es dar a conocer el prototipo e indicar los diferentes ámbitos a nivel laboratorio y proyectos donde puede ser utilizado

Prototipo para la Enseñanza de la Dinámica Rotacional (Conservación del Momento Angular)

We presented a prototype of low cost that allows to verify the conservation of the angular momentum. Data and validations with respect to the theoretical model appear. The purpose is to use it in rotation dynamics of Physics Education.Se presenta un prototipo de bajo costo que permite verificar la conservación del momento angular, se indican datos, y validaciones respecto al modelo teórico. Su fin es utilizarlo para la enseñanza de la física a nivel de dinámica de rotación