cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.14326489.v1
title: Design and construction of petal solar reflectors: paraboloid and catenoid

description: Abstract A detailed geometric study is presented of different designs of solar reflectors based on the methodology of petal diagrams. The paraboloid model is analyzed and a new model is introduced, the catenoid, discussing its advantages and disadvantages on a comparative basis. Conventional and optimized designs are presented for both kinds of surfaces, analyzing quantitatively several critical aspects such as focal distance, effective area and number of petals. Criterions and suggestions are offered to select materials and to plan the size of the system according to its purpose. Some constructed models are presented which evince a good convergence of reflected rays.
DOI: 10.6084/m9.figshare.14326493
title: Simulation of the exoplanet detection by the transit method using the conical pendulum and smartphone

description: Abstract This work consists of a didactic experiment which aims to simulate the observation of exoplanets by detecting the variation in the illuminace of light from the host star. For this, we use the technique that detect the effect of the exoplanet's shadow when it transits in front of its host star, known as the “transit method”. This technique is based on reducing the brightness of a star when the exoplanet transits in front of its disk, which works with a small percentage of planets whose orbital planes are aligned with the observer's line of sight. In this didactic proposal, a lamp plays the role of the host star, a sphere made of aluminum foil represents the exoplanet to be observed and the illuminance intensity detector is the luxmeter built into a smartphone. To represent the exoplanet's orbit, a conical pendulum was built being its bob the aluminum foil sphere. The results of the variation of illuminance are obtained via the phyphox app and interpreted considering the theoretical model used in the transit method.
DOI: 10.6084/m9.figshare.14326493.v1
title: Simulation of the exoplanet detection by the transit method using the conical pendulum and smartphone

description: Abstract This work consists of a didactic experiment which aims to simulate the observation of exoplanets by detecting the variation in the illuminace of light from the host star. For this, we use the technique that detect the effect of the exoplanet's shadow when it transits in front of its host star, known as the “transit method”. This technique is based on reducing the brightness of a star when the exoplanet transits in front of its disk, which works with a small percentage of planets whose orbital planes are aligned with the observer's line of sight. In this didactic proposal, a lamp plays the role of the host star, a sphere made of aluminum foil represents the exoplanet to be observed and the illuminance intensity detector is the luxmeter built into a smartphone. To represent the exoplanet's orbit, a conical pendulum was built being its bob the aluminum foil sphere. The results of the variation of illuminance are obtained via the phyphox app and interpreted considering the theoretical model used in the transit method.
DOI: 10.6084/m9.figshare.14326495
title: Proposal of a theoretical and experimental didactical practice of refracting telescopes and their applications

description: Abstract A didactical activity aiming the theoretical and experimental study of the refractive telescope is proposed for undergraduate physics, technology and engineering courses. The matrix method was used for determining the telescope properties like distance between the lenses and magnification, as a function of the lenses focal lengths and the distance between the object and the telescope. In the experiments the optical setup was comprised by the telescope itself and an artificial eye, which in turn is comprised by a positive lens as the eye lens and a planar screen as the retina. The magnification was directly measured from the retina and compared with the measurements obtained with the help of the equations retrieved from the matrix method, concerning the uncertainty propagation.
DOI: 10.6084/m9.figshare.14326495.v1
title: Proposal of a theoretical and experimental didactical practice of refracting telescopes and their applications

description: Abstract A didactical activity aiming the theoretical and experimental study of the refractive telescope is proposed for undergraduate physics, technology and engineering courses. The matrix method was used for determining the telescope properties like distance between the lenses and magnification, as a function of the lenses focal lengths and the distance between the object and the telescope. In the experiments the optical setup was comprised by the telescope itself and an artificial eye, which in turn is comprised by a positive lens as the eye lens and a planar screen as the retina. The magnification was directly measured from the retina and compared with the measurements obtained with the help of the equations retrieved from the matrix method, concerning the uncertainty propagation.
DOI: 10.6084/m9.figshare.14326498.v1
title: The porous size distribution obtained and analyzed by free access software

description: Abstract This paper presents the description of methods for using in the analysis of the pore size distribution of complex porous media as, for instance, soils. The sequence of analyses presented here can be implemented in classes of post-graduation in physics applied to earth, soil, and environmental sciences. The objective was to present the use, by students and/or researchers, of free access software to analyze images for obtaining some morphological aspects of porous systems. Two methods of obtaining the pore size distribution are presented: the first one is based on ImageJ internal routines, and the second in the study presented in Yang [1]. The results obtained permitted a detailed analysis of three-dimensional(3D) images of porous systems and also obtaining the pore size distribution of the investigated medium. The procedures here introduced can easily be extended for educational purposes in courses related to the investigation of systems with complex internal structures.
DOI: 10.6084/m9.figshare.14326498
title: The porous size distribution obtained and analyzed by free access software

description: Abstract This paper presents the description of methods for using in the analysis of the pore size distribution of complex porous media as, for instance, soils. The sequence of analyses presented here can be implemented in classes of post-graduation in physics applied to earth, soil, and environmental sciences. The objective was to present the use, by students and/or researchers, of free access software to analyze images for obtaining some morphological aspects of porous systems. Two methods of obtaining the pore size distribution are presented: the first one is based on ImageJ internal routines, and the second in the study presented in Yang [1]. The results obtained permitted a detailed analysis of three-dimensional(3D) images of porous systems and also obtaining the pore size distribution of the investigated medium. The procedures here introduced can easily be extended for educational purposes in courses related to the investigation of systems with complex internal structures.
DOI: 10.6084/m9.figshare.14326499.v1
title: A board game using contextualized topics in Physics

description: Abstract This work presents the development and application of a didactic board game, as a review activity, involving physics concepts related to the students' daily lives. The survey was applied to 51 third year high school students at the end of the first semester. The methodology highlights the importance of employing playfulness in the exploration of argumentation skills and in the social relationship of students, which is not normally included in a traditional class. Progress was observed in the relationships between the students themselves and also between teacher-students, during the joint elaboration of the answers to the questions contained in the cards present in the game. It is worth highlighting the importance of these interactions in the theoretical discussions of the physics content and in the construction of the relationships between these concepts and their daily lives. After the application of the activity, the teacher described that there was a greater interest of students in the discipline of physics, in addition to a more critical posture, observed by the dialogues in the classroom, during the completion of the discipline.
DOI: 10.6084/m9.figshare.14326499
title: A board game using contextualized topics in Physics

description: Abstract This work presents the development and application of a didactic board game, as a review activity, involving physics concepts related to the students' daily lives. The survey was applied to 51 third year high school students at the end of the first semester. The methodology highlights the importance of employing playfulness in the exploration of argumentation skills and in the social relationship of students, which is not normally included in a traditional class. Progress was observed in the relationships between the students themselves and also between teacher-students, during the joint elaboration of the answers to the questions contained in the cards present in the game. It is worth highlighting the importance of these interactions in the theoretical discussions of the physics content and in the construction of the relationships between these concepts and their daily lives. After the application of the activity, the teacher described that there was a greater interest of students in the discipline of physics, in addition to a more critical posture, observed by the dialogues in the classroom, during the completion of the discipline.
DOI: 10.6084/m9.figshare.14326501
title: Analysis of a bi-propellent rocket engine applied to teaching thermodynamics: a case study

description: Abstract The importance of the student's role in the learning process has been recognized for a long time. Several methodologies have been developed, such as inverted class and project-based teaching, or its less complex variant, case study-based teaching. Thermodynamics and fluid mechanics are some of the most complex disciplines taught in physics and engineering. Among its main difficulties for students, are the terminology and concepts little connected to everyday life, in addition to the need for an analysis, there is a need for connection between several of these concepts and a more complex mathematics than that found in Newtonian mechanics. The case study is considered by several authors to be a variant of teaching based on projects that are simpler to be implemented and accepted by students. In this work, a case study is carried out on the thermodynamic relationships of a bi-propellant rocket engine aimed at engineering students. From a simplified model of the engine, a mathematical modeling is done using the first law of thermodynamics and its implications. To perform the mathematical calculations from the analysis, an engine is considered whose propellant and fuel are liquid oxygen and liquid hydrogen (LOX / LH2), respectively. This case study is in line with The setting of the case can be made considering the various news about space exploration of projects in India, China or the so-called new space.
DOI: 10.6084/m9.figshare.14326501.v1
title: Analysis of a bi-propellent rocket engine applied to teaching thermodynamics: a case study

description: Abstract The importance of the student's role in the learning process has been recognized for a long time. Several methodologies have been developed, such as inverted class and project-based teaching, or its less complex variant, case study-based teaching. Thermodynamics and fluid mechanics are some of the most complex disciplines taught in physics and engineering. Among its main difficulties for students, are the terminology and concepts little connected to everyday life, in addition to the need for an analysis, there is a need for connection between several of these concepts and a more complex mathematics than that found in Newtonian mechanics. The case study is considered by several authors to be a variant of teaching based on projects that are simpler to be implemented and accepted by students. In this work, a case study is carried out on the thermodynamic relationships of a bi-propellant rocket engine aimed at engineering students. From a simplified model of the engine, a mathematical modeling is done using the first law of thermodynamics and its implications. To perform the mathematical calculations from the analysis, an engine is considered whose propellant and fuel are liquid oxygen and liquid hydrogen (LOX / LH2), respectively. This case study is in line with The setting of the case can be made considering the various news about space exploration of projects in India, China or the so-called new space.
DOI: 10.6084/m9.figshare.14326504.v1
title: Light diffraction experiment using fully automated data collection by Arduino

description: Abstract During the correction of reports on Young's experiment, from three classes of undergraduate physics students, it was observed that systematically the errors related to the measurements were concentrated in the measurements between the diffraction fringes. These measures are always susceptible to the sensitivity of the human eye, requiring some experience and care. This article describes an experimental, low-cost methodological alternative to perform the diffraction experiment, automated with Arduino. The methodology allowed us not only to calculate the thickness of a hair, with an estimated error of 3%, but also to graphically visualize the distribution of luminous intensity by means of graphs throughout the diffraction spectrum, something impossible without the resource used.
DOI: 10.6084/m9.figshare.14326505
title: A tool for simulating superparamagnetic systems

description: Abstract We introduce a software aimed to provide with a better understanding over the behavior of superparamagnetic systems under external magnetic fields that does not require previous knowledge in coding. Our simulator generates the magnetization behavior according to many variables such as temperature, saturation magnetization, and the average diameter of the magnetic moment. The problem is tackled in a very simple way via the Langevin function. Our work ultimately seeks to assist learning in nanostructured magnetic materials, quite often a bit hard to grasp by many students, thereby also being of use for prominent researchers in the field.
DOI: 10.6084/m9.figshare.14326504
title: Light diffraction experiment using fully automated data collection by Arduino

description: Abstract During the correction of reports on Young's experiment, from three classes of undergraduate physics students, it was observed that systematically the errors related to the measurements were concentrated in the measurements between the diffraction fringes. These measures are always susceptible to the sensitivity of the human eye, requiring some experience and care. This article describes an experimental, low-cost methodological alternative to perform the diffraction experiment, automated with Arduino. The methodology allowed us not only to calculate the thickness of a hair, with an estimated error of 3%, but also to graphically visualize the distribution of luminous intensity by means of graphs throughout the diffraction spectrum, something impossible without the resource used.
DOI: 10.6084/m9.figshare.14326505.v1
title: A tool for simulating superparamagnetic systems

description: Abstract We introduce a software aimed to provide with a better understanding over the behavior of superparamagnetic systems under external magnetic fields that does not require previous knowledge in coding. Our simulator generates the magnetization behavior according to many variables such as temperature, saturation magnetization, and the average diameter of the magnetic moment. The problem is tackled in a very simple way via the Langevin function. Our work ultimately seeks to assist learning in nanostructured magnetic materials, quite often a bit hard to grasp by many students, thereby also being of use for prominent researchers in the field.
DOI: 10.6084/m9.figshare.14326508
title: Construction of a didactic system for wave propagation speed determination in liquids

description: Abstract This work shows the construction, calibration and validation of a system to determine sound speed in liquids. We used the pulse method for the measurements. Piezoelectric transducers are used to transmit and receive acoustic wave pulses. The pulse travel time is determined by a counter implemented in a logic programmable device (FPGA). Initially the system is calibrated using pure water. We performed measurements in NaCl and CuSO4 solutions at different concentrations. The system detected speed variations of approximately 1.0 m/s in relation to the concentrations. Therefore, from didactical point of view, it is possible to perform experiments where small changes in the impurities concentration can be detected and measured. Further, the construction or even the enhancement of the system may be stimulant to students devoted to electronic instrumentation.
DOI: 10.6084/m9.figshare.14326508.v1
title: Construction of a didactic system for wave propagation speed determination in liquids

description: Abstract This work shows the construction, calibration and validation of a system to determine sound speed in liquids. We used the pulse method for the measurements. Piezoelectric transducers are used to transmit and receive acoustic wave pulses. The pulse travel time is determined by a counter implemented in a logic programmable device (FPGA). Initially the system is calibrated using pure water. We performed measurements in NaCl and CuSO4 solutions at different concentrations. The system detected speed variations of approximately 1.0 m/s in relation to the concentrations. Therefore, from didactical point of view, it is possible to perform experiments where small changes in the impurities concentration can be detected and measured. Further, the construction or even the enhancement of the system may be stimulant to students devoted to electronic instrumentation.
DOI: 10.6084/m9.figshare.14326510
title: Construction of an automated experimental model for the study of light polarization and experimental proof of Malus' Law with the aid of the Arduino platform

description: Abstract In this article, we present the necessary procedures for the construction of an automated experimental model to prove the Malus law with the aid of the Arduino platform, in line with the automation plan for laboratory practices at the General Physics Laboratories of the State University of Southwest from Bahia, UESB. The choice of the Arduino platform is primarily related to its low cost, ease of programming and its ability to study physical processes in real time in educational practice, which has allowed the modernization of laboratories, which are automated, manipulated remotely. The use of modern software and hardware resources, united by a universal software platform, allows the creation of virtual and real multifunctional tools with a comfortable interface for students and researchers. The experimental results obtained were used to demonstrate Malus' law by two methods. In fact, considering the latest advances in computer technology, there are real opportunities to introduce the most advanced and efficient software and hardware resources, highly interactive without the use of expensive equipment.
DOI: 10.6084/m9.figshare.14326513
title: Evaporative cooling of water in a clay-pot refrigerator: experimental study of heat and mass transfer

description: Abstract This paper describes a quantitative experiment to evaluate the performance of a clay-pot refrigerator which works on the evaporative cooling principle compare the experimental results with predicted values in heat and mass transfer model. The experiment, developed during “Instrumentation for Teaching” classes, was designed to be easily implemented by students that, in addition to performing the tests, made a spreadsheet that models the problem and evaluates the consistency of the results. The model based on a simplified heat and mass transfer is shown to be in good quantitative agreement with the experimental measurements. The experiment, allowing identifying the transfer mechanisms involved in a real physical system, may be employed in the classroom to support the teaching of Physics in this area.
DOI: 10.6084/m9.figshare.14326513.v1
title: Evaporative cooling of water in a clay-pot refrigerator: experimental study of heat and mass transfer

description: Abstract This paper describes a quantitative experiment to evaluate the performance of a clay-pot refrigerator which works on the evaporative cooling principle compare the experimental results with predicted values in heat and mass transfer model. The experiment, developed during “Instrumentation for Teaching” classes, was designed to be easily implemented by students that, in addition to performing the tests, made a spreadsheet that models the problem and evaluates the consistency of the results. The model based on a simplified heat and mass transfer is shown to be in good quantitative agreement with the experimental measurements. The experiment, allowing identifying the transfer mechanisms involved in a real physical system, may be employed in the classroom to support the teaching of Physics in this area.
DOI: 10.6084/m9.figshare.14326514.v1
title: Using acoustics waves for characterization of ceramic roof tiles: a didactic proposal of non-destructive test

description: Abstract The aim of this study was to develop a simple methodology, capable of characterizing different properties of ceramic roof tiles through the acoustics waves propagation. For this, was used the gravitational potential energy caused by the impact of a steel ball in free fall on the roof tiles surface. After this, the acoustic signal was captured using computer and free software. The results obtained showed the viability of the method as a didactic proposal to be implemented in the classes building materials laboratory carried out in civil engineering courses.
DOI: 10.6084/m9.figshare.14326514
title: Using acoustics waves for characterization of ceramic roof tiles: a didactic proposal of non-destructive test

description: Abstract The aim of this study was to develop a simple methodology, capable of characterizing different properties of ceramic roof tiles through the acoustics waves propagation. For this, was used the gravitational potential energy caused by the impact of a steel ball in free fall on the roof tiles surface. After this, the acoustic signal was captured using computer and free software. The results obtained showed the viability of the method as a didactic proposal to be implemented in the classes building materials laboratory carried out in civil engineering courses.