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The development of computational thinking has become one of the educational priorities in several countries around the world. In this article, two experiences are described in which two block programming tools are used. The first experience only used BlocksCAD, while the second added the use of Blockly and the work on some mathematical algorithms in a maths classroom. The number of participants in the experience was twenty-eight in the group that only used Blocky and thirteen in the group that combined the use of both tools, all of them of the third year of secondary education (between 14 and 15 years old) in a school in Spain. The results show that, although the use of Blocks-CAD alone allows an increase in the development of CT, if other resources such as Blockly are also used in the mathematics classroom, the effect is multiplied. In addition, considering the satisfaction results of the participants in the experience, together with the possibility of printing their own creations through 3D modelling (a fact claimed by the students themselves), this encourages us to continue using both tools and even to try to combine them with other tools and to design experiences that encompass entire academic courses or, at least, entire trimesters. [ABSTRACT FROM AUTHOR]

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Copyright of Alteridad: Revista de Educación is the property of Universidad Politecnica Salesiana and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Interuniversitaria de Formación del Profesorado is the property of Asociacion Universitaria de Formacion del Profesorado (AUFOP) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Virtual Universidad Católica del Norte is the property of Revista Virtual Universidad Catolica del Norte and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Uni-Pluri/Versidad is the property of Universidad de Antioquia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Noise is a form of pollution resulting from the undeniable increase in industrialization worldwide. Anthropogenic noise can have negative effects on the survival of a species, as it can mask acoustic signals relevant to foraging, mate searching and distribution. In response to this, the Lombard effect acts as a compensatory mechanism, and refers to an increase in the amplitude of acoustic signals in response to an increase in background noise level. In this study, a theoretical-mathematical approach is proposed to illustrate a simple classification based on three general types of Lombard response. Finally, by means of numerical simulations, we graphically analyze the effects of Lombard responses in a mathematical model of population persistence in a critical and quasi-periodic noise environment. [ABSTRACT FROM AUTHOR]

Copyright of Avances de Investigación en Educación Matemática is the property of Sociedad Espanola de Investigacion en Educacion Matematica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Avances de Investigación en Educación Matemática is the property of Sociedad Espanola de Investigacion en Educacion Matematica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Avances de Investigación en Educación Matemática is the property of Sociedad Espanola de Investigacion en Educacion Matematica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Paradigma is the property of Universidad Pedagogica Experimental Libertador and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Paradigma is the property of Universidad Pedagogica Experimental Libertador and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Espacios is the property of Talleres de Impresos Oma and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Avances de Investigación en Educación Matemática is the property of Sociedad Espanola de Investigacion en Educacion Matematica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Uni-Pluri/Versidad is the property of Universidad de Antioquia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Uni-Pluri/Versidad is the property of Universidad de Antioquia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Avances de Investigación en Educación Matemática is the property of Sociedad Espanola de Investigacion en Educacion Matematica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Examinating the behaviors in the data dispersion, it is possible to recognize the Normal Distribution as a mathematic/statistic object of relevance to deepen its scholastic processing. This article proposes, from a historical-epistemological approach, to analyze and suggest an epistemic route for a conceptual approximation, with the aim of encouraging and multidisciplinary approach. Related to this, it is recognized the normal probability plot as an approximation to the Normal Distribution, centering the analysis in the behavior of the error's data beyond the data, getting a conceptual approximation external, singular and innovating from the one promoted in terms of curriculum. For that it is suggested to contextualize as a conceptual framework a traditional approach of the mathematic modeling from the mathematic didactic, clearing the use of the oxygen blood's saturation. Using the didactic engineering as qualitative methodological design, the answers to the modeling task applied in students from 17 to 18 years in the Libertador Bernardo O'Higgins region are analyzed. The results show that the modeling task is conductive to the learning of Normal Distribution, being today a proposal that increases didactically not only the teaching, but also the learning of the Normal Distribution. [ABSTRACT FROM AUTHOR]

This article aims to analyze of what mathematics learning is constituted in mathematical modelling from the understanding of modeling as an organization of empirical situations. This issue has been analyzed based on the understanding of mathematics as a normative rule governed system. This view of mathematics is based on Ludwing Wittgenstein's analysis of philosophical delimitations as well as Anna Sfard's theoretical understanding about it. The discourses produced by a group of students and a teacher during the implementation of the modelling have been adopted as empirical material for the analysis of the theme. These data have been collected through observation method. The uses that the students and the teacher attributed the words allowed us to point out that the discursive modeling game is played under the rules instituted in the mathematical way of life developed in the school context. [ABSTRACT FROM AUTHOR]

Copyright of Avances de Investigación en Educación Matemática is the property of Sociedad Espanola de Investigacion en Educacion Matematica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Formación Universitaria is the property of Centro de Informacion Tecnologica (CIT) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Contaduría y Administración is the property of Facultad de Contaduria y Administracion-Universidad Nacional Autonoma de Mexico and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This article describes the results of a basic research focused on mathematical modelling and the use of the obtained model in the near reality context. Students obtained a model, a function, and apply it to answer questions located within a real world problem, which approximates the experience to the recommendations of the OECD/PISA problem solving. This work intended to assess the acquisition of math skills of students associated with the model obtained. [ABSTRACT FROM AUTHOR]

Copyright of Ensayos de Economia is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The study of tsunami has been of great interest in the last decade. Due to the use of mathematical models to simulate the effects of tsunami on oceans and coasts, it has been possible to compute accurately arrival times and wave heights on specific areas of interest. This paper presents a general mathematical introduction and computational elements of the modeling of propagation of tsunami waves for the basin of the Caribbean Sea with special focus on the bay of Cartagena, Colombia. [ABSTRACT FROM AUTHOR]

Copyright of Avances en Ciencias e Ingeniería is the property of Avances en Ciencias e Ingenieria and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The anchoring effect is defined as the tendency of human thought to the fixation on certain pieces of information that affect decision-making. In the same context, the underconfidence bias is understood as an agent's propensity to underestimate his or her own objective performance. While some aspects of these phenomena are well known, there are no formal models that specifically describe the relationship between both. This paper presents: i) an experiment that illustrates the anchoring effect on the underconfidence bias by both reducing and amplifying such bias in the domain of geographic decision tasks and ii) the foundations of a new mathematical model that promotes precision in the study of the relationship between anchoring and underconfidence. [ABSTRACT FROM AUTHOR]

A mathematical modelling of the reduction process for the ferronickel production was completed. Based on the equations of mass and energy balance, a system of equations forming a dynamic mathematical model is presented as well as the scientific foundations upon which they were obtained. The main oxides and elements minerals of construction of the furnace walls and of the reducing gases were considered for the transformation of the mass and energy balance equations. A system of first order differential equations, complemented with other algebraic equations establishing the relation between coefficients and physical parameters, was obtained. [ABSTRACT FROM AUTHOR]

Copyright of Zona Próxima is the property of Fundacion Universidad del Norte and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This paper presents the application of a multiobjective linear model of the feeding process for a cattle assigned to meat production in a Cattle Farm. The multiobjective linear programming work uses the following criteria: Types of pasture, nutrients present in the animal diet, budget, as well as the total area to be cultivated and/or cleaned. Among the most relevant results are stated the superiority of the multiobjectives linear model whith respect to the unicriterial standards models This allows to optimal decisions making in the farm. [ABSTRACT FROM AUTHOR]

In the present study, growth «in vitro» responses of Alcaligenes sp. and E. coli isolated of restructured roll and affected by pH (5 to 7) and temperature (2 to 4 °C, 6 to 8 °C, 15 #x00B0;C) were studied. Growth curves were fitted using Gompertz modified equation and specific rates derived from curve fit were modelled. Predictions for specific growth rate, generation time and phase lag duration could be done for any combination of conditions within the matrix. Predictions of growth from model were compared with experimental data and this showed the model to be suitable for predicting growth of Alcaligenes sp. and E. coli in restructured meat rolls. [ABSTRACT FROM AUTHOR]

The present work shows the results or the authors related with mathematical modelling the process of cooling of reduced mineral in the rotary horizontal cooler; Equations that conform the model and its scientific fundamentals are exposed. The modelling is based, mainly, in the establishment of the energetic balances in the dynamic way, that carries to obtainment of a partial derivates differential equations system, which is complemented with other algebraic equations that establish the relation between the different coefficients and parameter. [ABSTRACT FROM AUTHOR]

In the Cuban companies of the nickel, the pneumatic conveying has been limited by the excessive energy expense that reaches the 18, 82 MJ/T. The causes that originate this difficulty are: the incorrect selection of the speed of the gas transporter, the existence of the feeders numberless and the infinite variety of physical and aerodynamic characteristics of the materials to transport that lead to the inaccuracy of the projects of the pneumatic facilities. Starting from the existent knowledge for the pneumatic transport of solids in the flowed and dense phases a descriptive theoretical model is deduced whose parameters (difference of speed between the gas and the solid and flotation speed) are obtained with data of an experimental installation. To obtain the parameters of the pattern is used the method of solution differential equations Runge-Kutta fourth order, like part of a procedure iterative that it leads to the minimization of the average error module between the experimental values and the predicted for the pattern. With the employment of the pattern it is simulated the dependence of the losses of pressure, the solid flow and the concentration of the mixture in function of the gas flow of the laterític mineral pneumatic transport systems. The reduction of the losses pressure with the increment of the speed fluid is confirmed in inferior areas to the 6,12 m/s in the horizontal transport and 5,21 m/s in the vertical one. The transport in continuous dense phase extends until the 18 m/s, approximately, in both cases. [ABSTRACT FROM AUTHOR]

It was possible to study the performance of a Phosphoric Acid Fuel Cell with the "In Situ" Electrochemical Impedance Spectroscopy Technique. The technique has a great potential as a effective tool to carry out studies in the fuel cell field. [ABSTRACT FROM AUTHOR]

In this work it is presented a mathematical model of a heat exchanger of the shell and tube type as well as the simulation of a bank of exchangers of heat, for the evaluation and/or prediction of its behavior. The objectives of the model are to calculate the outlet temperatures of both fluids, the heat loss, the overall coefficient of heat transfer, the yielded heat by the oil fractions, the heat absorbed by the crude oil, so as the pressure drop by the side of the tubes and the shell. The calculation of the physical properties for the crude and its fractions in an automated form taking into consideration a statistical model adjusted to each of them are also shown in this work. The executive program SIMEST was used for the simulation, which was created by the author of this work. The obtained results from the simulation of the bank of exchangers are satisfactory because the percentage of relative error among the simulation results with respect to real experimental runs does not exceed the 8 % in most of the cases. [ABSTRACT FROM AUTHOR]

The present work shows the results of the authors related with the mathematical modelling of the calcination process of the basic nickel carbonate in the rotary kiln. Equations that conform the model and its scientific fundamentals are exposed. The modelling is based, mainly, in the establishment of the material and energetic balances in the dynamic way, that carries to the obtainment of a partial derivates differential equations system, which is complemented with others algebraic equations that establish the relation between the different coefficients and parameters. [ABSTRACT FROM AUTHOR]

This paper shows the results obtained by the authors on the research and analysis of the mathematical model of contac tank and licour coolers in the carbonateammoniac leaching process with cuban lateritic minerals, for their automatic regulation. An analysis of the mean variables that characterize the mixer (the tank for the mixing process and the coolers for the licour coolings) is done. It is proposed a dinamical mathematical model for the tank and coolers, through the mass and energy balances, expressing all dynamic dependencies in nonlinear differential equations with concentrated parameters. This work includes simulation with real plant parameters. [ABSTRACT FROM AUTHOR]