## Recursos de colección

#### RiuNet. Repositorio institucional de la Universitat de Valencia (96.506 recursos)

RiuNet es el Repositorio Institucional de la Universitat Politècnica de València, gestionado por la Biblioteca, cuyo objetivo es ofrecer acceso en Internet a la producción científica, académica y corporativa de la comunidad universitaria con la finalidad de aumentar su visibilidad y hacerla accesible y preservable.

Modelling in Science Education and Learning

1. #### Utilizacion de un modelo simple de transporte de agua y nitrógeno en el suelo en las practicas de Horticultura

Lidón, A.; Ginestar, D.; Gómez de Barreda, D.
[EN] Simulation models for the transport of water and nitrogen in the soil are useful tools for evaluating the consequen-ces of di erent crop management practices without waiting until the end of the crop cycle. Particularly, simplecompartmental models for the transport of water and nitrogen are based on the solution of mass balance equationsfor the water and a system of ordinary di erential equations for the nitrogen cycle. In this work, these modelsare used to evaluate di erent possible scenarios of irrigation and nitrogen fertilization in a cauli ower crop, as apractical work for the students of Horticulture course. The results...

2. #### Un Recorrido de Estudio e Investigación para el aprendizaje del concepto devariable aleatoria discreta mediante métodos de Monte Carlo

Estruch, Vicente D.; Boigues, Francisco J.; Vidal, Anna
[EN] The concept of random variable is a mathematical construct that presents some theoretical complexity. However,learning this concept can be facilitated if it is presented as the end of a sequential process of modeling of a realevent. More speci cally, to learn the concept of discrete random variable, the Monte Carlo simulation can providean extremely useful tool because in the process of modeling / simulation one can approach the theoretical conceptof random variable, while the random variable is observed \in action". This paper presents a Research and StudyCourse (RSC) based on series of activities related to random variables such as...

3. #### Simulación numérica de un conjunto de altavoces subwofers utilizando Elementos Finitos

Banyuls-Juan, Xavier; Atiénzar-Navarro, Roberto; Picó, R.
[EN] Teaching in the Master of Acoustic Engineering includes contents that require the modeling of acousticsystems of two types: simple systems through analytical theory and complex models using simulationtechniques. In the present work, we describe an example of complex acoustic sources modeling using the nite element method: subwoofer sound radiation in di erent con gurations. Numerical simulations inthe frequency domain can calculate the radiation pattern of systems that do not have a simple analyticalsolution

4. #### Representación de distribuciones tensionales en elementos lineales prismáticos y cilíndricos

Giménez-Palomares, Fernando; Jiménez-Mocholí, Antonio-José; Lapuebla-Ferri, Andrés; Monsoriu-Serra, Juan-Antonio
[EN] The loads applied on a linear structural element generate internal forces in the cross sections which, inturn, result in stresses along the element. The nature, extent and shape of stress distributions are requi-red parameters to compute the strength of structural elements or machinery components in order to itsanalysis or design. In this work, it is presented a virtual laboratory which allows to obtain di erent stressdistributions in an isostatic beam, prismatic or cylindrical, subjected to axial forces, shear forces andbending moments. The virtual laboratory permits a great interactivity, allowing the simulation of variousreal situations in which the user can...

5. #### Modelización del crecimiento de una población microbiana en medio líquido y su implicación en el estudio de la morfología celular a través del análisis digital de imágenes

Viteri, Ángel; Blanco, Mónica; Carbó, Rosa; Ginovart, Marta
[EN] When the yeast is grown in a nutrient-rich liquid medium, its growth curve consists of three main phases: adap-tation (or lag) phase, exponential (or log) phase and stationary phase. Buchanan's model is a piece-wise linearmodel which, although being a rather simple model, turns out to be good enough to estimate the main kineticparameters of microbial growth. The morphometry of yeast cells, which can reproduce by budding (with mothercells and daughter cells), provides information about the state of yeast populations and their productive capacity.Experimental results in connection with the number of cells of S. cerevisiae growing in closed liquid culture...

6. #### Modelización de sistemas elásticos continuos mediante el Método de Elementos Finitos

Herrero-Durá, I.; Picó, R.; Sánchez-Morcillo, V.J.; Garcia-Raffi, L.M.
[EN] Propagation of mechanical waves in unidimensional systems is a fundamental part of physics, necessaryfor learning subjects such as acoustics and vibrations. The vibration of transverse waves in strings isthe easiest case of elastic system. Usually, this is the rst continuous elastic system in which studentsapply fundamental mathematical concepts as vibration mode, equation of motion and boundary condition.In this work the use of simulation methods is proposed to reinforce the understanding of vibratory andacoustic simple phenomena. This will be applied to the case of a string, a beam and a membrane of nitelength with di erent physical characteristics and boundary...

7. #### Los problemas de Fermi como actividades para introducir la modelización: qué sabemos y qué más deberíamos saber

Albarracín, Lluís
[EN] Fermi problems have been widely used in Physics teaching at university level in the UnitedStates. Multiple recommendations for use in other educational areas can be found in theliterature, as the case of mathematical modeling introduction, but its presence in mathclassrooms has not been yet achieved. We present these problems and discuss about itsde nition and characteristics that make them particularly interesting for the use of mat-hematics in real contexts. We also review those aspects that have been investigated fromthe perspective of mathematics education, especially the way in which students generatemathematical models to solve them and we aim some directions...

8. #### Laboratorio Virtual como Herramienta para Comprender el Funcionamiento de las Líneas de Alta Tensión

Roldán-Blay, Carlos; Pérez-Sánchez, Modesto
[EN] Three-phase electrical power lines are di cult to model elements due to a number of phenomena that in othervoltage levels may be negligible. To calculate basic parameters (resistance, inductance and capacitance) whichresult in simple validated models (either of concentrated or distributed parameters) to simulate the operationof lines, some expressions have been developed with a complexity that hinders their assimilation. To facilitatethe alignment between teaching and learning, a set of virtual laboratories using Matlabchas been developed tofacilitate the understanding of the operation of high voltage lines. In this paper, one of these laboratories thatallows the representation of the geometry of...

9. #### La modelización en la Econometría

Alguacil Marí, M.; Jiménez Fernández, E.
[EN] The current economic environment, together with the low scores obtained by our students in recent years,makes it necessary to incorporate new teaching methods. In this sense, econometric modelling providesa unique opportunity o ering to the student with the basic tools to address the study of Econometricsin a deeper and novel way. In this article, this teaching method is described, presenting also an examplebased on a recent study carried out by two students of the Degree of Economics. Likewise, the successof this method is evaluated quantitatively in terms of academic performance. The results con rm ourinitial idea that the greater...

10. #### Experiencia de montaje y operación de una impresora 3D en el aula

Orquín Serrano, Ismael; Aguado Sahagún, Henar; Berenguer Sánchez, Gregorio; Petrovic Filipovic, Vojislav
[EN] An academic experience consisting of mounting and using a 3d printer in the secondary school class ofTechnology is described. Also the methodology developed by teachers responsible of the project for taskscoordination as well as the way students interacted along their work, are explained. Di erent groups ofstudents were formed in order to work in three di erent tasks: research task, documents development andassembly task. Each di erent task had its own teacher for guiding, assisting and assessing the student'swork. This kind of innovative experiences are shown not only to motivate students but also to encouragethem to face STEM (Science,...

11. #### Estudio del flujo neutrónico en un reactor cilíndrico

Vidal-Ferràndiz, A.; Carlos, Sofia; Verdú, G.
[EN] n the Energy Engineering Degree of the Universitat Polit ecnica de Val encia, the students attend to theNuclear Technology course, in which the basic knowledge of this technology is presented. A main objectiveof this technology is to obtain neutron population distribution inside a reactor core, in order to maintainthe ssion reaction chain. As this activity cannot be experimentally developed, mathematical modelling isof great importance to achieve such objective. One of the computer laboratories proposed consists in theneutron ux determination analytically and numerically in a cylindrical geometry. The analytical solutionmakes use of the Bessel functions and is a good example...

12. #### Diseño de un Experimento de Optimización del Proceso de Coagulación-Floculación de Aguas en el Laboratorio de Química

Devesa-Rey, Rosa; Rodríguez Rodríguez, Francisco Javier; Urréjola Madriñan, Santiago
[EN] The application of mathematical concepts and the generation of mathematical solutions to engineeringproblems are essential to the educational problems of all undergraduate engineering students. As enginee-ring is a practising profession, multidisciplinary approaches to lab experiment courses can lead to a betterexperience for students. This paper describes the application of Surface Response Methodologies (RSM)to a Chemical Engineering course. In particular, the paper considers the application of an experimentaldesign employing scienti c software likeStatgraphicsto mimic the management of polluted e uentsfrom industries, so students will relate \real world" into an otherwise theoretical education. The mainlaboratory skills developed under the framework of...

13. #### Desarrollo de habilidades de modelación desde las ecuaciones más simples de la Hidrodinámica

Castro-Palacio, Juan Carlos; Velázquez-Abad, Luisberis; Perea, Milton H.; Navarro-Pardo, Esperanza; Acosta-Iglesias, Dagoberto; Fernández-de-Córdoba-Castellá, Pedro
[EN] The development of modeling skills is a very important issue in Science teaching nowadays. The present workillustrates how, from the simplest equations of hydrodynamics, it is possible to contribute to this end. Bernoulliand continuity equations are included in Physics syllabi of secondary and university levels, and can be seen as alinking between general and professional education. By means of the proposed project, students are taken throughgeneral stages which are usually present in any engineering project or research work based on modeling and simu-lation. such as the formulation of the problem, the statement of the Physics model, a computational simulationand...

14. #### Contraste numérico-experimental de un modelo matemático que simula el movimiento del flujo en condiciones de aguas someras incluyendo las pérdidas de energía

Balaguer-Beser, A.; Rodríguez-Benlloch, F. J.; Nácher-Rodríguez, B.; Vallés-Morán, F. J.
[EN] In this paper, a comparison between the results obtained in laboratory experiments and those calculated by anumerical simulation of shallow water equations in an open channel is performed, considering the energy lossesthat occur as it passes through a local narrowing of the cross section. The mathematical model that simulatesthis physical phenomenon is governed by a partial di erential equations system whose solution provides the waterdepth and the ow rate per unit of width, which is related to the velocity of the water. Such movement is controlledprimarily by the force of gravity, being fundamental the relationship between it and the...

15. #### Aumentando la realidad química

Roqueta Buj, Mª Luisa
[EN] The use of new technologies such as Augmented Reality in teaching Che-mistry can handle virtual information and associate it with elements of reallife. To access it is done through a technological device with a speci c soft-ware. This technological tool called Augmented Reality allows adding digitalcontent to our real world by increasing our perception of it. It allows us toincorporate content in text, image, audio or video.

16. #### Análisis de los procesos de resolución de tres tareas de modelización

Gallart Palau, Cèsar; Ferrando Palomares, Irene; García-Raffi, L. M.
[EN] n this paper we present a comparative analysis of the resolution process of three modeling tasks per-formed by secondary education students (13-14 years), designed from three di erent points of view: TheModelling-eliciting Activities, the LEMA project, and the Realistic Mathematical Problems. The purposeof this analysis is to obtain a methodological characterization of them in order to provide to secondaryeducation teachers a proper selection and sequencing of tasks for their implementation in the classroom.

17. #### El difícil camino de la mujer en la ciencia

Val Castillo, Otilia
[EN] When we think in scientists, we remember scienti c men. What about scienti c women? In ancient timeswomen had been considered by men for homework, without right to study at the university. In the beginningHypatia from Alejandria was a pioneer scienti c woman but she was assassinated for not become Christianin 416. From then sex discrimination went on by ages.

18. #### Utilizando las Matemáticas para resolver problemas de Acústica de Salas

Vidal Meló, Anna; del Rey Tormos, Romina; Sapena Piera, Almanzor; Roig Sala, Bernardino; Estruch Fuster, Vicente Domingo; Boigues Planes, Franciso José; Alba Fernández, Jesus
[EN] This article shows how students can approach hall acoustics problems in a rst degreecourse with the aid of Mathematics subjects. In this way, students nd a direct applicationto their future workplace of the acquired knowledge in Mathematics subjects. This projectis located in the Grado de Ingenier a de Sistemas de Telecomunicaci on, Sonido e Imagenof the Escuela Polit ecnica Superior de Gandia in the Universitat Polit ecnica de Val encia

19. #### Aperiodic Diffract: Estudio de redes difractivas

Ferrando Martín, Vicente; Calatayud, Arnau; Remón, Laura; Monsoriu, Juan A.; Pons-Martí, Amparo; Furlan, Walter D.
[EN] In this work we introduce a virtual laboratory, APERIODIC DIFFRACT, developed in Matlab GUI (Graphical User Interface) as an informatics tool for teaching the diffractive properties of aperiodic gratings. This GUI allows the student to generate aperiodic sequences by iterating and lets to study the spectra for different iterating orders.

20. #### WAVEFRONT TESTER: Un nuevo laboratorio virtual para el estudio de los sensores frente de onda.

Ferrando Martín, Vicente; Remón Martín, Laura; Furlan, Walter D.; Gimenez Palomares, Fernando; Monsoriu Serra, Juan Antonio
[EN] We present a new virtual laboratory developed with MatlabcGUI (Graphical User Interface) used toteach di erent aberration eff ects in the "Tecnologi a de Sensores Optoelectr onicos" at "Escuela T ecnicaSuperior de Ingenier a del Diseño" of the Universitat Polit ecnica de Val encia. The objective of this lab is to provide a computer tool to study the working principle of a Shack Hartman sensor and the parameters that determine the dynamic range of the same. Some examples made with di fferent aberrations (defocus,astigmatism, coma) and for diff erent sensor con gurations are presented.

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