Searcharxiv⌕ Search

arXiv subjects

Marco P. M. de Souza

Publications and source records attributed to Marco P. M. de Souza.

9 recordsLinked to original sources
arXiv2026

Investigating nonlinear dynamics in a mass-spring oscillator using real-time computer vision

We present a low-cost laboratory for investigating the dynamics of a vertical mass-spring oscillator using real-time computer vision. The proposed system automatically tracks the motion of the oscillating mass with a smartphone camera, displays the displacement in real time, and exports the recorded data for further analysis. Representative experiments include damped oscillations, oscillation period measurements, spectral analysis, and phase-space reconstruction. The system also enables the investigation of nonlinear phenomena, including harmonic generation, frequency mixing, and energy exchange between coupled oscillation modes. Owing to its low cost, ease of construction, and automated data acquisition, the proposed apparatus extends the traditional mass-spring experiment to include topics in nonlinear dynamics that are rarely explored in undergraduate laboratories.

physics.ed-ph↗
arXiv2025

Pendulum Tracker -- SimuFísica: A Web-based Tool for Real-time Measurement of Oscillatory Motion

We present Pendulum Tracker, a computer vision-based application that enables real-time measurement of the oscillatory motion of a physical pendulum. Integrated into the educational platform SimuFísica, the system uses the OpenCV.js library and runs directly in the browser, working on computers, tablets, and smartphones. The application automatically detects the pendulum's position via the device's camera, displaying in real time the angle-versus-time graph and estimates of the oscillation period. Experimental case studies demonstrate its effectiveness in measuring the period, determining gravitational acceleration, and analyzing damped oscillations. The results show excellent agreement with theoretical predictions, confirming the system's accuracy and its applicability in educational contexts. The accessible interface and the ability to export raw data make Pendulum Tracker a versatile tool for experimental physics teaching.

physics.ed-ph↗
arXiv2025

Exploring Heat Exchanges with the Calorimetry Simulator -- SimuFísica

This article presents the Calorimetry - SimuFísica simulator, an interactive computational tool designed for teaching heat exchange processes. The simulator enables dynamic and audiovisual exploration of phenomena such as the heating of liquids and the establishment of thermal equilibrium between bodies at different temperatures. We describe its interface and the underlying physics, based on the equations of specific heat, latent heat of vaporization, and Newton's law of cooling. Two educational application examples are analyzed, in which the simulation results are compared with calculations typically performed at the high school and early undergraduate levels, highlighting the consistency between theory and simulation and the pedagogical potential of the tool.

physics.ed-ph↗
arXiv2024

Electric Motor -- SimuFísica: an application for teaching electromagnetism

In this work, we present the Electric Motor simulator, an application from the SimuFísica\textsuperscript{\textregistered} platform designed for classroom use. We briefly describe the technologies behind the application, the equations that govern its operation, some studies showing the dynamics of the electric motor, and, finally, the use of the application in High School and Higher Education.

physics.ed-ph↗
arXiv2024

The Conservation of Mechanical Energy simulator -- SimuFísica

Currently, the benefits of using computer simulations in the school environment are widely recognized by educators. The encouragement to use these simulations in classrooms is supported by the National Common Curricular Base, a normative document that defines essential learning for basic education. This article focuses on the exploration of the Mechanical Energy Conservation simulator, a free simulator developed with the purpose of illustrating the transformations between kinetic, gravitational potential, and elastic potential energies. This application is part of SimuFísica\textsuperscript{\textregistered}, a multilingual and multiplatform software that offers computer simulations for teaching physics, which operates both online and offline. Throughout the article, some features of the SimuFísic\textsuperscript{\textregistered} platform and the details of how the Mechanical Energy Conservation simulator works are objectively presented. Two illustrative examples are provided, demonstrating the application in action for solving mechanics problems.

physics.ed-ph↗
arXiv2023

Motor elétrico -- SimuFísica: um aplicativo para o ensino de eletromagnetismo

In this work, we present the Electric Motor simulator, an application on the SimuFísica platform intended for use in the classroom. We briefly describe the technologies behind the application, the equations that govern its operation, some studies showing the dynamics of the electric motor and, finally, examples of approach in the classroom. -- Apresentamos neste trabalho o simulador Motor elétrico, um aplicativo da plataforma SimuFísica voltado para uso em sala de aula. Descrevemos brevemente as tecnologias por trás do aplicativo, as equações que regem o seu funcionamento, alguns estudos mostrando a dinâmica do motor elétrico e, por fim, exemplos de abordagem em sala de aula.

physics.ed-ph↗
arXiv2022

ALT: A software for readability analysis of Portuguese-language texts

In the initial stage of human life, communication, seen as a process of social interaction, was always the best way to reach consensus between the parties. Understanding and credibility in this process are essential for the mutual agreement to be validated. But, how to do it so that this communication reaches the great mass? This is the main challenge when what is sought is the dissemination of information and its approval. In this context, this study presents the ALT software, developed from original readability metrics adapted to the Portuguese language, available on the web, to reduce communication difficulties. The development of the software was motivated by the theory of communicative action of Habermas, which uses a multidisciplinary style to measure the credibility of the discourse in the communication channels used to build and maintain a safe and healthy relationship with the public.

cs.CL↗
arXiv2022

ALT: um software para análise de legibilidade de textos em Língua Portuguesa

In the initial stage of human life, communication, seen as a process of social interaction, was always the best way to reach consensus between the parties. Understanding and credibility in this process are essential for the mutual agreement to be validated. But, how to do it so that this communication reaches the great mass? This is the main challenge when what is sought is the dissemination of information and its approval. In this context, this study presents the ALT software, developed from original readability metrics adapted to the Portuguese language, available on the web, to reduce communication difficulties. The development of the software was motivated by the theory of communicative action of Habermas, which uses a multidisciplinary style to measure the credibility of the discourse in the communication channels used to build and maintain a safe and healthy relationship with the public. -- No estágio inicial da vida humana a comunicação, vista como um processo de interação social, foi sempre o melhor caminho para o consenso entre as partes. O entendimento e a credibilidade nesse processo são fundamentais para que o acordo mútuo seja validado. Mas, como fazê-lo de forma que essa comunicação alcance a grande massa? Esse é o principal desafio quando o que se busca é a difusão da informação e a sua aprovação. Nesse contexto, este estudo apresenta o software ALT, desenvolvido a partir de métricas de legibilidade originais adaptadas para a Língua Portuguesa, disponível na web, para reduzir as dificuldades na comunicação. O desenvolvimento do software foi motivado pela teoria do agir comunicativo de Habermas, que faz uso de um estilo multidisciplinar para medir a credibilidade do discurso nos canais de comunicação utilizados para construir e manter uma relação segura e saudável com o público.

cs.CL↗
arXiv2016

Coherent blue emission induced by a combination of diode and femtosecond lasers

We report the investigation of a collimated blue light generated in rubidium vapor due to the combined action of an ultrashort pulse train and a cw diode laser. Each step of the two-photon transition 5S - 5P$_{3/2}$ - 5D is excited by one of the lasers, and the induced coherence between the 5S and 6P$_{3/2}$ states is responsible for generating the blue beam. Measurements of the excitation spectrum reveal the frequency comb structure, indicating that each individual mode is responsible for inducing a nonlinear process. The strong signal dependency on the atomic density is characterized by a sharp growth and rapid saturation.

physics.atom-ph↗