bluuebunny/crossref_metadata_2025 huggingface dataset:
Active flow control optimization on Selig Donovan 7003 airfoil
Authors:   , Monshi Tousi Navid
Published: February 2024

(English) The PhD focuses on the study of the flow around an airfoil at different Angles of Attack (AoA) with and without the implementation of Active Flow Control (AFC), while maintaining the Reynolds number constant at 60,000. The advantages of employing AFC technology are clearly established.

The PhD is divided into three main studies:

1- The flow over the airfoil at different AoA and using the 2D Spalart-Allmaras (SA) RANS turbulence model is studied. A novel and precise methodology is employed to optimize five AFC-associated parameters.

2- In the second stage, three-dimensional Large Eddy Simulations (LES) are conducted on both the baseline and the previously optimized actuated cases to examine the appropriateness of the SA turbulence model for the AFC optimization.

3- The effect of AFC on the flow performance, boundary layer, separation, and the forces acting on the airfoil is explored as a function of the nutilda boundary conditions value at the computational domain inlet and the synthetic jet. The optimum values of nutilda, which generate the most precise 2D-RANS-SA simulations, are obtained.

(Català) La tesi es centra en l'estudi del flux al voltant de un perfil alar per diferents angles d'atac (AoA) i quan la técnica de control actiu de flux (AFC) es aplicada, la comparació amb el cas base clarifica les avantatges de la utilització de AFC. Tot l'estudi es fa per un número de Reynolds de 60000.
La tesi es pot dividir en tres grans blocs:

1.- Estudi del flux bidimensional al voltant del perfil triat i per diferents AoA utilitzant el model de turbulencia Spalart Allmaras. Una nova metodologia per optimitzar els cinc paràmetres associats a la técnica AFC ha sigut dissenyada i aplicada per primera vegada en aquesta tesi.

2.-Simulacions tridimensionals utilitzant el model de turbulencia LES es aplicada a un angle d'atac determinat tant per el cas base com quan es consideren els cinc paràmetres AFC optimitzats en l'estudi bidimensional inicial. La comparació entre els paràmetres associats al flux amb sense AFC i entre les simulacions 2D-SA i les 3D-LES, han permès clarificar la precisió dels models 2D.

3.- El efecte de l'aplicació de la técnica AFC sobre el punt de separació de la capa límit, i els coefficients de pressió, fricció, arrastre i sustentació, son avaluats per diferents valors del paràmetre nutilde associat al model de turbulecia Spalart Allmaras donat com a condicions de contorn a l'entrada del domini computacional i del synthetic jet. En aquest tercer bloc, s'han definit per primera vegada quins son els valors de nutilde que fan que les simulacions bidimensional siguin més properes a les 3D-LES.
Consumer market and factors affecting it
Authors:   Azerbaijan Cooperation University, Akhverdieva K.A.
Published: February 2024

In article the factors influencing development of the consumer market are investigated. The author carries out classification of a complex of factors. In particular, was the analysis and group of factors directly or indirectly of the consumers influencing behavior is made. In article the main priorities and problems of development of the consumer market of Azerbaijan are also defined. Scientific conclusions of the author are reflected in the conclusion of article.
Theoretical and methodological bases of the regional ecological and economic management mechanism
Authors:   Azerbaijan University of Architecture and Construction, Mammadova F.Ə. , .Faracova M.S. ,   Azerbaijan University of Architecture and Construction
Published: February 2024

The article discusses the main approaches to determining the nature and structure of the environmental management mechanism. A systematic approach to the presentation of the main concepts, events and processes that reveal the content of the environmental management mechanism is proposed. In the Republic of Azerbaijan as a whole and in particular in its regions, the improvement of environmental and economic management in a special area takes an important place during the solution of environmental protection problems. The need for a complex approach to ensure the modern life of the society as a whole and the individual is determined both by the quality of the natural environment more precisely, natural-anthropogenic and by the increase in environmental problems. A lot of information about such processes, discussions conducted at various levels of the scientific community and civil society confirm the relevance of this scientific direction and determine the choice of the goal of this research the clarification of theoretical propositions on environmental and ecological problems.
Identifying Student Motivation in Learning Islamic Education in Senior High School
Authors: Saputri Teni Eki , Izmi Nelly , Putera Odsisa , Irayanti Irma
Published: February 2024

In general, the reality that with a Senior High School ll number of teachers and a large number of students is that it is unlikely that teachers will be able to provide maximum motivation to students. A large number of students, not comparable to the number of teachers, will usually have difficulty nurturing students with maximum motivation. The aim of this research is to look at students' intrinsic motivation, students' extrinsic motivation, supporting and inhibiting factors in learning Islamic religious education. This research uses descriptive qualitative methods. The data collection techniques used are observation, interviews, and documentation with data analysis through data reduction, data presentation, and drawing conclusions and verification. The results of this research were obtained: i) the intrinsic motivation of students at Senior High School 2 Payakumbuh in learning Islamic religious education was obtained through the appreciation given by the teacher and the students' sense of responsibility. This award is motivation for students to develop and progress further in their learning process, ii) extrinsic motivation for Senior High School 2 Payakumbuh students is obtained from the motivation provided by teachers, principals, and all the environment in the school. Adequate infrastructure is one of the motivations for student learning in achieving goals, iii) supporting factors in increasing student learning motivation in learning Islamic religious education, namely students are given Islamic religious learning guidance, in the form of congregational prayers, tahfiz, reading the koran and delivering learning material. The inhibiting factor in increasing students' learning motivation in learning Islamic religious education is the lack of Islamic religious education lesson hours at school. Apart from the lack of teaching hours for Islamic religious education teachers, students who study religion are less aware of the importance of studying Islam. The results of this research can be used as initial data for future researchers in studying this problem in different contexts and issues.
Identification and Analysis of the Design Process of Character Education for Students in Islamic Boarding Schools
Authors: Indria Anita , Mulya Hari Wino , Hafizh Muhammad
Published: February 2024

The mus canduang Islamic boarding school uses its vision and mission as guidelines in the learning process. This shows that the vision and mission of this madrasah encompasses the entire character, both the character recommended in religion and the character recommended by the government. School principals and teachers work together to shape students' character through the existing vision and mission both in the learning process and in extracurricular activities, inside school and outside school. In this case, researchers are interested in researching the identification and analysis of the character education design process implemented at the mus canduang Islamic boarding school. This research is field research using descriptive methods. The research results show that for those selected to be responsible for the position they hold, teachers are also responsible for student activities from the start of learning until the learning is completed. For extracurricular activities, the person responsible is the teacher who guides the activity. Implementation is divided into two, namely intracurricular and extracurricular, intracurricular, namely the learning process in class, the teacher will direct students to pay attention to learning, and students are required to be active and creative. Extracurricular activities are activities carried out outside mandatory class hours such as scouts or cults. Teacher evaluation carries out supervision or observation weekly, or once a month. According to the head of the curriculum at the mus canduang Islamic boarding school, the results of character education have improved, both in terms of discipline and in terms of manners.
Implementation of Islamic Religious Education in Boarding-Based Public Schools
Authors: Febriani Lara , Junaidi Junaidi , Belia Sameto Mayang
Published: February 2024

The awareness of Islamic boarding school-based school students in practicing Islamic teachings in their daily lives is the topic of discussion in this research. Based on the problems that the author found in the field, there are still some students who speak impolite words, there are still female students who wear tight clothes and wear hijabs that do not cover their chests, and there are still some students who are not disciplined and behave not in accordance with Islamic teachings as appropriate. students who have undergone Islamic education which has been equipped with strengthening religious knowledge. This research aims to find out how Islamic religious education is implemented in Islamic boarding school-based public schools at Junior high school 4 Lembah Gumanti. This type of research is field research with a qualitative descriptive method. The data collection technique is through interviews, observation, and documentation studies. The author utilized key, main, and supporting informants to obtain data. Then the author carried out data analysis using analytical descriptive analysis. The author uses data triangulation as a technique to check the validity of the data.
Finite-Time Regulation of Robot Manipulators in the Task-Space
Authors:   Universidad de Guadalajara, México, Cruz-Zavala Emmanuel , Aldana Carlos ,   Universidad de Guadalajara, México, Moreno Jaime ,   Universidad Nacional Autónoma de México, Nuño Emmanuel ,   Universidad de Guadalajara, México
Published: February 2024

This paper proposes a control scheme in order to attain finite-time regulation of robots manipulators in the task-space. The stability analysis is carried out by means of strict Lyapunov functions since the well-known results of homogeneous systems cannot be applied directly. Simulations results verify the performance of the proposed control scheme.
Real-Time Optimization with Modifier Adaptation Based on Dynamic Gradient Estimation
Authors:   Universidad de Guanajuato, México, Torres Zúñiga Ixbalank , Navia Daniel ,   Universidad Técnica Federico Santa María, México, López-Caamal Fernando ,   Universidad de Guanajuato, México, Hernández-Escoto Héctor ,   Universidad de Guanajuato, México
Published: February 2024

In this paper, an optimization strategy with modifier adaptation based on a mechanistic model and the estimation of the input-output map gradient is presented to solve optimization problems in real-time. The strategy consists of defining an optimization problem based on the process model with first-order modifiers in the objective function that include the information of the input-output map gradient to correct the uncertainties of the process model. The gradient of the input-output map is estimated by means of a differentiator based on a multivariable Super-Twisting algorithm. The proposed real-time optimization with modifier adaptation strategy is implemented in a bioethanol production process and validated through closed-loop simulations.
An Integral Sliding–Mode–based Interval Predictive Control for Constrained LPV Systems
Authors:   Tecnológico Nacional de México/I.T. La Laguna, México, Ríos Héctor , Gutiérrez Martínez Susana Viridiana ,   Universidad Autónoma de Nuevo León, México, Raïssi Tarek ,   Conservatoire National des Arts et Métiers, Francia, Efimov Denis ,   Inria, Univ. Lille, Francia
Published: February 2024

This paper presents the design of a robust controller, based on an integral sliding–mode control (ISMC) approach together with an interval predictor–based state feedback controller and a Model Predictive Control (MPC) scheme, for a class of uncertain linear parameter-varying (LPV) systems. The proposed controller deals with some state and input constraints and is robust to some external disturbances and parameter uncertainties. Furthermore, the performance of the proposed scheme is validated by numerical simulations.
Effects of Deterministic Measurement Noise on Barrier Function-Based Adaptive Sliding-Mode Control
Authors:   Universidad Nacional Autónoma de México, González Andrés , Ovalle Luis ,   Universidad Nacional Autónoma de México, Fridman Leonid ,   Universidad Nacional Autónoma de México
Published: February 2024

The effect of deterministic measurement noise on barrier function-based adaptive sliding mode controllers (BFASMC) is analyzed. For general bounded deterministic noise signals, it is impossible to select the controller parameters to track some perturbation with unknown bound. Nonetheless, if the assumption of continuity of the noise is added, the tracking of such a perturbation is possible whenever the barrier function width depends on the bound of the noise. If Lipschitz continuity of the noise is assumed, then the barrier function width can be chosen arbitrarily.
Trajectory Generation Considering Non-Holonomic Constraints for an Indoor Quadrotor
Authors:   Instituto Politécnico Nacional, México, Sandoval-Reyes J. C. , Mera Manuel ,   Instituto Politécnico Nacional, México, Bejarano Francisco Javier ,   Instituto Politécnico Nacional, México
Published: February 2024

Nowadays the use of quadrotors is extremely extended in different recreational, industrial and research environments, for that reason having a way to generate motion following a predetermined position without losing the degrees of freedom of the quadrotor is an interesting idea. In the present work a model of a quadrotor with cross configuration is obtained, analytically by the Euler-Lagrange method, and non-holonomic constraints are imposed through a vector that gives the direction to follow in every movement it performs. A Twisting control is used to generate the point-to-point trajectory that the quadrotor should follow, in particular for this work, pointing to the positive x-axis of the quadrotor.
An LMI-Based Unknown Input Observer for Nonlinear Systems
Authors:   Sonora Institute of Technology, México, Bernal Miguel , Quintana Daniel ,   Sonora Institute of Technology, México, Estrada-Manzo Víctor ,   Universidad Politécnica de Pachuca, México
Published: February 2024

This paper presents a novel unknown input observer for nonlinear systems which, based on as much time derivatives of the output as its relative degree plus one, is able to asymptotically reconstruct both the state and the unknown input for a class of nonlinear systems. Design conditions are expressed as linear matrix inequalities thanks to a convex representation of the nonlinear terms involved in the error system which, in turn, is obtained from a recently appeared factorization. Examples are provided to highlight the advantages of the proposal.
Isolation and Identification of Periodic Disturbances in BLDC Motors
Authors:   Universidad Nacional Autónoma de México, de la Guerra Alejandra , Coronado-Andrade Axel ,   Universidad Nacional Autónoma de México, Gutiérrez-Giles Alejandro ,   Instituto Nacional de Astrofísica Optica y Electronica INAOE, México
Published: February 2024

A high-gain linear observer is proposed for online identification and reconstruction of a periodic disturbance. It is assumed that the frequency of the periodic disturbance is known, but its amplitude and phase are unknown. This is not a stringent assumption since such supposition can be easily characterized for disturbances like cogging torque, or bearing defects, both well-known problems in the control of electric machines. The observer design is based on the internal model principle in combination with a high-gain observer. Numerical results are included to validate the estimation of the periodic disturbance even when another disturbance of a different frequency is added. The estimated disturbance can be used to design a controller for reducing the disturbance effect. Alternatively, the estimated disturbance can be used for fault detection like in the case of gears and bearing faults, or simply to characterize the cogging torque of a particular machine.
Estimation of Electrical Angular Position and Load Torque for Sensorless Control Design in Permanent Magnet Synchronous Motor
Authors:   Tecnológico Nacional de México, Instituto Tecnológico de Tijuana, Aldrete Maldonado Christian , Coria Luis ,   Tecnológico Nacional de México, Instituto Tecnológico de Tijuana, Ramírez-Villalobos Ramón ,   Tecnológico Nacional de México, Instituto Tecnológico de Tijuana
Published: February 2024

This work proposes the design of an extended state observer to estimate the electrical angular position, angular velocity, and load torque of a surface permanent magnet synchronous motor. We propose a rotating mathematical model (d,q) modified to the observer design when exists an alignment error between the actual and estimated reference frame. From the study of the observer's stability, we propose a methodology to estimate the electrical angular position of the rotor. Finally, we perform high-precision emulations to validate the theoretical results.
Necessary and Sufficient Stability Conditions: Traffic Systems
Authors:   CINVESTAV-IPN, México, Castaño Alejando , Portilla Fuentes Gerson ,   CINVESTAV-IPN, México, Mondié Sabine ,   CINVESTAV-IPN, México
Published: February 2024

A new stability analysis for traffic systems characterized by the presence of pointwise and distributed delays is presented. The stability analysis is carried out via stability tests in a finite number of mathematical operations. In addition, an improved necessary and sufficient condition for retarded type systems is also presented. Some examples allow testing and validating the proposed stability analysis.
Observer-predictor based on a PD controller for high-order delayed systems with one unstable pole and n pairs of complex conjugate poles
Authors:   Instituto Politécnico Nacional, México, Olivar Mejía Arturo , Del Muro Cuéllar Basilio ,   Instituto Politécnico Nacional, México, Márquez-Rubio J. ,   Instituto Politécnico Nacional, México, Duchen Sánchez Gonzalo ,   Instituto Politécnico Nacional, México
Published: February 2024

This paper considers the stability of continuous linear systems with time delay. In particular, systems with one unstable pole and n pairs of complex conjugate and/or real poles are analyzed. The proposed solution consists of using an estimated state observer with a closed-loop PD type controller to access to the internal variables of the system. A partition of the time delay is proposed in the observer to addmit the double of the maximum size that when a simple PD controller is considered. The necessary and sufficient conditions for the stability of the proposed control scheme are presented and an example is presented with simulations to demostrate the usefulness of the proposed control strategy.
Trajectory Kinematics Control for a Robotis Bioloid Premium Arm
Authors:   Universidad del Papaloapan, México, Santiaguillo-Salinas Jesús , Castañeda González Roberto ,   Universidad del Papaloapan, México, Archila Sánchez Eliuh ,   Universidad del Papaloapan, México, García-Domínguez Luis ,   Universidad del Papaloapan, México, Cervantes Morales Juan ,   Universidad del Papaloapan, México
Published: February 2024

This paper addresses the problem of trajectory tracking in one arm of the Bioloid Premium humanoid robot. The kinematics modeling of the left arm was obtained using the Denavit-Hartenberg methodology. A kinematics control strategy based on state feedback and Input-Output Linearization technique was employed to achieve accurate tracking of the desired trajectories. A C language code was written to reprogram the CM-530 controller of the Bioloid Premium to allow it to interpret and execute the trajectory positions. In addition, wireless communication was established using ROS as the development platform. The experimental results demonstrate the success of the proposed approach in applying kinematic control on the robotic arm, offering an accurate and advanced alternative to the mobility options natively enabled by the ROBOTIS software.
Analysis of a Multiport DC/DC Converter Used for Energy Extraction from a Photovoltaic system
Authors:   Centro Nacional de Investigación y Desarrollo Tecnológico, México, García Morales Jarniel , de los Reyes-Suárez Lázaro ,   Centro Nacional de Investigación y Desarrollo Tecnológico, México, Mares-Gardea Arturo ,   Centro Nacional de Investigación y Desarrollo Tecnológico, México, Adam-Medina Manuel ,   Centro Nacional de Investigación y Desarrollo Tecnológico, México, Cervantes-Bobadilla Marisol ,   Centro Nacional de Investigación y Desarrollo Tecnológico, México, Guerrero-Ramírez Gerardo ,   Centro Nacional de Investigación y Desarrollo Tecnológico, México
Published: February 2024

In this paper, a simulation analysis of a multiport DC/DC converter with Boost topology has been carried out. The converter topology consists of two inputs and one output. This analysis aims to obtain the first version to cope with partial shading in a PV system using a multiport converter. The analysis shows the multiport converter's functionality to track the maximum power point of the two PV panels using the Perturb and Observe (P&O) algorithm in normal irradiance conditions and partial shading situations. A switching time of the switches was established to perform individual power extraction from each panel connected to each port individually. These findings will contribute to the feasibility of the proposed methodology for efficient energy extraction using multiport converters as another alternative to cope with partial shading.
Mathematical Modeling of a Three-Phase Induction Motor Fed by a Photovoltaic System
Authors:   Centro Nacional de Investigación y Desarrollo Tecnológico, México, Pineda-Uribe Alejandro , Guerrero-Ramírez Gerardo ,   Centro Nacional de Investigación y Desarrollo Tecnológico, México, Martinez-Barbosa Alberto ,   Centro Nacional de Investigación y Desarrollo Tecnológico, México, Adam-Medina Manuel ,   Centro Nacional de Investigación y Desarrollo Tecnológico, México, Guerrero-Ramírez Esteban ,   Universidad Tecnológica de la Mixteca, México
Published: February 2024

This paper presents the mathematical modeling of the three-phase squirrel cage induction motor and its driver, the DC bus, and a photovoltaic system comprised of photovoltaic cells and the DC/DC boost converter. The mathematical modeling is accomplished in two manners, using the laws of Physics and the Euler-Lagrange approach. In addition, the mathematical modeling also considers the 𝒂𝒃𝒄 and 𝒒𝒅𝟎 reference frames. The mathematical models are validated through simulation in the Matlab/Simulink environment, programming the obtained equations and comparing them with a block model of the simulation environment.
Proportional-Resonant Controller with Frequency Adaptation
Authors:   Universidad Nacional Autónoma de México, Rueda-Escobedo Juan , Moreno Jaime ,   Universidad Nacional Autónoma de México, Ávila-Becerril Sofia ,   Universidad Nacional Autónoma de México
Published: February 2024

The current changes in the grid driven by the energy transition demands better performance from the devices connected to it. This involves the continuous supply of energy despite the presence of distortion and events of high voltage and frequency volatility. In this direction, the present work contributes by introducing a proportional-resonant controller for power inverters with the capability of tracking distorted references of varying frequency. Since the controller is able of adapting the frequency of the resonant terms, we refer to it as adaptive proportional-resonant controller. In this work, not only the aforementioned controller is presented, but a formal proof of its capability of tracking references of varying frequency is given. Furthermore, it is shown that the proposed controller also guarantees the stability of the inverter when connected to a non-ideal grid. These properties are also illustrated via numerical simulation.
Artificial Neural Networks for Predicting Pressure in High-Viscosity Two-Phase Flow: A Comparative Analysis
Authors:   Universidad Nacional Autónoma de México, Torres Lizeth , Ajbar Wassila ,   Universidad Nacional Autónoma de México, Guzmán Enrique ,   Universidad Nacional Autónoma de México, Palacio-Pérez Arturo ,   Universidad Nacional Autónoma de México
Published: February 2024

This article presents the procedure undertaken to discover the most suitable model for predicting the outlet pressure of a horizontally oriented pipe with high-viscosity two-phase flow. In order to achieve this, a collection of artificial neural networks (ANN) with diverse architectures was developed, utilizing experimental data for training and validation purposes. The data used in this study were obtained from experiments carried out in a 54-meter-long pipeline, where a mixture of air and glycerin was flowing. The various ANN were constructed based on three different combinations of input variables, namely, the air flow rate (Qa), glycerin flow rate (Qg), and pressure measurements at specific spatial points. Subsequently, a statistical analysis was performed, followed by a comparison of the models' performance across different scenarios.
Non-Linear Prediction Scheme for an Omnidirectional Mobile Robot with Disturbed Time Delay
Authors:   CINVESTAV-IPN, México, Báez-Hernández Julio , Mondie Sabine ,   CINVESTAV-IPN, México, Velasco-Villa Martín ,   CINVESTAV-IPN, México
Published: February 2024

This work focuses on the trajectory tracking problem of an input-delayed omnidirectional mobile robot affected by a constant disturbance in the time delay. The trajectory-tracking solution is based on a prediction strategy that represents a generalization of the well-known sub-prediction strategy developed for the linear case. It is formally proven that the prediction scheme provides the future state of the system and that a feedback law based on the future predicted state solves the trajectory tracking problem under some assumptions related to the size of the disturbance and the number of sub-predictors considered. To evaluate the prediction-based strategy, numerical simulations are carried out showing an adequate performance of the overall closed-loop system.
Wireless CO2 and Ozone Monitoring with IoT Technology for Indoor Air Quality
Authors:   Instituto Tecnológico de Ciudad Guzmán, México, Chávez-Bracamontes Ramón , Mancilla-Peña Fernando ,   Instituto Tecnológico de Ciudad Guzmán, México, Sepulveda-Rubio Samuel ,   Instituto Tecnológico de Ciudad Guzmán, México, Mejía-Cárdenas Cynthia ,   Instituto Tecnológico de Ciudad Guzmán, México
Published: February 2024

This article presents the development of a wireless sensing and control system for indoor air quality by measuring gases such as carbon dioxide, as well as the use of ozone as a biocide agent for environmental control in real time, respecting concentrations allowed by national and international environmental health standards. The developed system uses cutting edge technology such as the Internet of Things and Cloud Computing that allows remote access to air quality measurements through mobile devices with the installation of the developed App, which has the capacity for registration and controlled access to users, auto-configuration of devices and data visualization in real time and historical record. The use of ozone as a biocide agent for environmental control was effective against the use of chemicals or other substances since it does not leave hazardous residues, inhibiting the generation of new colonies and keeping the areas under a disinfection control.
Cyber-Physical Multi-Robot Formation: Virtual Agents Approach and Low-Cost Experiments
Authors:   Universidad Iberoamericana, México, Giron-Nieto Huber , Ochoa-García Oliver ,   Universidad Iberoamericana, México, Hernandez-Martinez Eduardo ,   Universidad Iberoamericana, México, Ramírez-Neria Mario ,   CINVESTAV-IPN, México, Fernandez-Anaya Guillermo ,   Universidad Iberoamericana, México, Ferreira-Vazquez Enrique ,   Universidad Católica del Uruguay, Uruguay, Flores-Godoy José ,   Universidad Católica del Uruguay, Uruguay
Published: February 2024

A cyber-physical formation includes all the strategies to coordinate mobile robots moving in different physical workspaces sharing information through internet and the cloud. This work addresses a formation scheme of robots moving in two different workspaces. The control strategy is based on virtual agents used like ”avatars” which must converge to the position of the robots in the opposite workspace. The control approach is designed for robots modeled as single integrators and extended to the case of unicycle-type robots. Results of numerical simulations and real experiments are shown using a low-cost cyber-physical micro-robot platform based on a camera as position and orientation sensor.
Development of an experimental prototype of a manufacturing cell for process automation teaching
Authors:   Universidad Autónoma de la Ciudad de México, Morales Valdez Jesús , Noriega-Pineda Daniel ,   Universidad Autónoma de la Ciudad de México, Sagredo-Hernández René ,   Universidad Autónoma de la Ciudad de México
Published: February 2024

For the industrial sector, the filling, sealing and labeling system represents one of the most used processes with several applications, that involves the food and beverage industry until the chemical plants, among many others applications. The propouse of this work is to develop an academic prototype of a manufacturing cell for teaching the automation of industrial processes, in order to emulate the filling, sealing and labeling system. The goal is to design a learning methodology such that the acquired academic knowledge can be transported to a real industrial environment. To achieve this, the PLC S7-300, industrial proximity sensors, pneumatic cylinders of the Festo brand, as well as their respective solenoid valves, are used. The programming methodology is based on a functional graph controlled by stages and transitions (GRAFCET). In contrart with other project based on Arduino, this project employs standard signals and variable scaling.
Toward a Voltage Reconfigurable Logic Gate
Authors:   Instituto Potosino de Investigación Científica y Tecnológica, México, Díaz-Díaz Irwin , Campos Eric ,   Universidad Autónoma de la Ciudad de México
Published: February 2024

Currently, novel approaches are being developed to overcome the imminent Moore's law failure. The techniques attempt to gain greater computing power by reducing the number of transistors. This work presents the simulation of a reconfigurable voltage logic gate based on the equation of a plane. The proposal is achieved by using two variables of the equation of a plane as inputs and the other as output. The proposed circuit can perform the NAND and NOR logic gates, known as universal logic gates. The simulation results show the feasibility of the proposed reconfigurable logic gate. Also, the presented circuit is compatible with the transistor-transistor-logic and can be modified to implement other logic gates by changing a voltage level.
Neuro-Integral Sliding Mode Control for the Perturbed Unicycle Mobile Robot
Authors:   Centro de Innovación y Desarrollo Tecnológico en Cómputo, Instituto Politécnico Nacional, México, Salgado Iván , Mera Manuel ,   Escuela Superior de Ingeniería Mecánica y Eléctrica, Instituto Politécnico Nacional, México, Ballesteros Mariana ,   Unidad Profesional Interdisciplinaria de Biotecnología, Instituto Politécnico Nacional, México, Ríos Héctor ,   Tecnológico Nacional de México/I.T. La Laguna, México
Published: February 2024

This work proposes the design of a robust controller for the perturbed kinematic model of the unicycle mobile robot. The controller is based on integral sliding modes (ISMs) and the approximation provided by a differential neural network (DNN) for the tracking error dynamics, represented as an uncertain time-varying linear system. The methodology ensures asymptotic stability for the tracking error despite multiplicative disturbances in the control channel. The ISM compensates for the matched dynamics identified with the DNN. Then, a feedback controller minimizes the effect of unmatched dynamics by solving a set of Linear Matrix Inequalities. Simulation results show the feasibility of the proposed strategy against classical controllers.
Health Education and Simulation of Breast Self-Examination Implementation for Young Women at Konawe Islands State High School
Authors: Kurniawan Fajar , Nasus Evodius , Lisnawati Lisnawati , Tawakkal Tawakkal , Nurmala Ira , Andriyani Andriyani , Hasda Hasda , Qur'ani Qur'ani , Andrean Sugi Rico
Published: February 2024

This lecturer's dedication aims to increase health awareness of adolescent girls at Konawe Islands State High School through education and breast self-examination simulations. Lecturers are involved in the development of educational programs involving interactive presentations, group discussions, and simulated demonstrations of breast self-examination. During the activity, lecturers provided in-depth knowledge about the importance of early detection of breast cancer and provided practical information on how to conduct self-examination correctly. The simulation was performed using simple breast models and visual aids. The results of this dedication show an increase in the knowledge and skills of young women in conducting breast self-examinations, as well as motivating them to maintain breast health regularly. With this approach, lecturer service contributes positively to breast cancer prevention efforts and improves the quality of life of adolescent girls in the educational environment.
Factors Influence on Consumers’ Organic Food Purchasing Decisions: An Empirical Investigation in Bangladesh
Authors:   BGC Trust University Bangladesh, BGC Biddyanagar, Kanchan Nagar, Chandanaish, Chittagong, Bangladesh, Sultana Mir Misnad
Published: February 2024

Organic foods are becoming more attractive to consumers than conventional foods globally, mainly driven by perceived positive impacts on consumer health, environment, and sustainable development. This research aims to uncover the factors influencing consumers' organic food purchasing decisions in Bangladesh, especially Chattogram. This study employs purposive sampling methods to collect 435 responses from people who buy organic foods from different urban and sub-urban areas in Chattogram, Bangladesh, from various green markets, raw markets, super stores, and departmental stores. A Sophisticated Statistical Technique, "Factor Analysis" (Principal Component Analysis, and Confirmatory Factor Analysis), is used to understand why consumers purchase organic foods. The result showed nine factors, where the first consideration is perceived value, followed by marketing strategy, health consciousness, availability, attitudes, trust, subjective norms, and perceived behavioral control. The factor analysis results revealed that nine factors account for 61.85% of the variance of consumers' organic food purchasing decisions. This study's findings suggest that all these nine factors influence consumers' organic purchasing decisions: perceived value, marketing strategy, health consciousness, availability, attitudes, Trust, environmental concern, subjective norms, and perceived behavioral control. These findings are crucial for producers and authorities responsible for ensuring nutritional value, health concerns, and ecological sustainability.
Effective and Pleasant Leadership of the Principal
Authors: Susanti Emilya , Viona Elsa
Published: February 2024

This article aims to analyse and describe matters related to the principal’s leadership pattern that is effective and pleasing to all stakeholders in the Education Unit Institution. The effectiveness of a leader is the main key to achieving the school’s vision and mission. But the headmaster as a leader sometimes has to have a hard time pleasing everyone. What kind of leadership pattern of the principal can be said to be effective and able to please teachers and other employees? The type of research used in this article is a quantitative approach. The method in this study is interviews which will be analysed using descriptive analysis. The sample of this study 30 respondents from 49 teachers from SMA Negeri 1 Banyuasin III, the author used purposive sampling techniques with the researchers’ consideration of the samples. The data is a type of primary data with the distribution of questionnaires, then the data is analysed descriptively. The findings in this study are that effective and pleasant leadership of the principal can be seen from the performance of teachers and employees in the school and their positive feelings about what they do and experience. In the scientific field, writing this article will be a useful contribution in the field of education in order to improve the quality of education services, because it is directly with the achievement of teacher productivity as the heart of the success of achieving the vision and mission and goals of the school. The results of this study can also be taken into consideration for school principals, by paying attention to things that support the creation of effective and pleasant leadership in order to create a better performance system for an educator in carrying out their duties.
Visualización de la pandemia de COVID-19 en R
Authors: Saturno Jorge
Published: February 2024

Probablemente sientes que estamos inundados con información sobre la evolución de la pandemia de COVID-19. Sin embargo, nada mejor que manejar los datos uno mismo y analizarlos desde distintos puntos de vista. Creo que siempre hay alguien que observará algo en los datos que se nos ha escapado a millones de observadores y creo que cualquier aporte en esta emergencia mundial es valioso.
Bibliothèque de groupe : quelques pistes pour collaborer efficacement
Authors: Flamerie Frédérique
Published: February 2024

“Team” flickr photo par dtype – https://flickr.com/photos/dtype/29762481 – Creative Commons (BY-NC) Ce billet s’inspire largement du billet de Pegasus Librarian,  Best Practices for Groups using Zotero  , ainsi que d’expériences personnelles de groupe.
Projeto armazém – um jogo relacional
Authors: Favero Franciele , Goudel Francine Regis , Crispe Juliana
Published: February 2024

O presente artigo propõe trazer reflexões sobre o Projeto Armazém, suas relações históricas, conceituais e artísticas. Traz o múltiplo de artista e a publicação de artista como elemento motriz para realização do projeto em suas diferentes articulações e efetivações ao longo de mais de 10 anos de realização. A compreensão coletiva, de um projeto que se torna corpo vivo, entre artistas de distintas gerações, entre os espectadores, entre a quebra de hierarquia instaurada no campo artístico, tudo isso ligado a multiplicidade da obra de arte faz deste projeto um jogo relacional, vivo e pulsante na história da arte catarinense e com sua inserção no circuito artístico nacional.
Experiências de educomunicação e formação em educação ambiental da Sala Verde “Observatório de educação, saúde, cidadania e justiça socioambiental do Vale do Itajaí (SC - Brasil)”
Authors: Matarezi José , Bernardino Elielson , Bembém André Luis
Published: February 2024

O artigo apresenta as experiências e ações do Projeto da Sala Verde “Observatório de Educação, Saúde, Cidadania e Justiça Socioambiental - Vale do Itajaí (SC)”, denominado de Projeto Sala Verde Itajaí, no ano de 2017. As “Salas Verdes” são uma política pública do Ministério do Meio Ambiente (MMA) do Governo Federal. Em Itajaí (SC) a Sala Verde é gerida pela Universidade do Vale do Itajaí (UNIVALI) por meio do Laboratório de Educação Ambiental (LEA) da atual Escola Politécnica. A partir da perspectiva crítica e transformadora da Educação Ambiental, são descritos e analisados resultados dos três subprojetos: “Educomunicação e Circuito Tela Verde”; “Formação em Educação Ambiental para Gestão Participativa e Políticas Públicas” e “Espaço de Exposições Sala Verde”, que integram o projeto político pedagógico da Sala Verde Itajaí. São detalhados os processos metodológicos adotados, que seguem um ciclo contínuo de sistematização envolvendo as etapas de “Planejar - Executar - Avaliar - Comunicar”, em especial a produção de educomunicação dos projetos e ações de extensão do LEA, via digitalização do seu acervo e atualização do seu Canal de Educomunicação. As atividades são fundamentadas pelos princípios éticos e pela luta contra a opressão vivenciada pelos cidadãos, por meio de intervenções integradas de extensão, ensino e pesquisa. Além disso, são produzidos materiais didáticos audiovisuais e de educomunicação a partir dessas ações, em colaboração com os editores sociais envolvidos. Entre estas experiências destacam-se: 1) Curta-metragem “Mais que a Lama: Memórias, Ausências e História” coeditado com famílias atingidas pelo crime socioambiental das mineradoras Samarco, Vale e BHP Billiton no município de Mariana (MG); 2) Vídeo tutorial “Como fazer uma composteira caseira”; e 3) Exposição interativa “É Preciso Ter Força!”. Essas experiências contemplaram o uso dos recursos audiovisuais, estéticos para fomentar as reflexões e os diálogos de saberes sobre as problemáticas socioambientais de nossa sociedade.
Extensão e divulgação científica: a contribuição de projetos de extensão na formação dos universitários
Authors: Alves Bruna , Oliveira Marília de , Schnorr Samuel Molina
Published: February 2024

É perceptível a importância de projetos de extensão para a formação docente, assim como a relevância social de ações voltadas à educação e divulgação científica. Assim, buscamos discutir como projetos de extensão do Instituto de Biologia da UnB contribuem para a educação e divulgação científica por meio da análise das atividades desenvolvidas. A metodologia consiste na análise documental de projetos de extensão, além de questionários voltados aos coordenadores e extensionistas. Acredita-se que a participação nesses projetos contribui para a formação do estudante, uma vez que, além de permitir o contato com a comunidade externa, a interação entre teoria e prática, a troca de conhecimento, e o contato com a atividade profissional, possibilita o desenvolvimento de habilidades e competências inerentes às diversas atuações dos universitários.
How the DMCA Anticipated the DSA’s Due Process Obligations
Authors: Goldman Eric , Schwemmer Sebastian
Published: February 2024

Among other things, the new DSA requires platforms to provide “due process”-like protections for user-authors. This regulatory approach is an important Internet Law development, but it’s not completely novel. The DMCA also contains several due process-like protections for user-authors. This post identifies some of the DMCA’s due process elements, compares them to the DSA’s analogous provisions, and discusses the lessons from the DMCA for the DSA. Though the DSA uses a different policy paradigm than the DMCA, it’s unclear if it will achieve better outcomes.
Comportamiento agronómico y productivo del Botón de oro (Tithonia diversifolia) en tres edades de corte en la Granja Mishilí, Santo Domingo de los Tsáchilas.
Authors: Andrade Villaroel Génesis Mishell , Murillo Nazareno Tatiana Thais , González Buitrón Karina Tatiana
Published: February 2024

El botón de oro (Tithonia diversifolia), es uno de los recursos forrajeros más importantes dentro de la alimentación animal, y es así que el siguiente trabajo de investigación tuvo como objetivo evaluar el comportamiento agronómico y productivo del botón de oro (Tithonia diversifolia) en tres edades de corte estudio realizado en la Granja Experimental Mishilí perteneciente al Instituto Superior Tecnológico Tsa´chila en la provincia de Santo Domingo de los Tsáchilas, donde se evaluaron diferentes variables agronómicas y productivas, estableciendo un ensayo de campo donde se aplicaron 3 tratamientos correspondientes a diferentes edades de corte: 50, 60 y 70 días, con 7 repeticiones por cada tratamiento. Se registraron parámetros agronómicos como altura de la planta, numero de hojas/plantas, ancho de hoja, longitud de hoja, grosor del tallo, producción de biomasa radicular, producción de biomasa aérea. Los resultados mostraron diferencias significativas en el rendimiento y características agronómicas en el botón de oro (Tithonia diversifolia). Esto sugiere la importancia de seleccionar la edad óptima de corte para maximizar la producción y mejorar la calidad nuticional del botón de oro (Tithonia diversifolia) como recurso agrícola, siendo la mejor para este caso a los 70 días dónde se obtuvieron los siguientes resultados, longitud de planta 292,57 cm, longitud de raíz 47,43 cm, ancho de hoja 19,89 cm, longitud de hoja 28,40 cm
Effect of Thoracoscopic Surgery under Spontaneous Respiration on Inflammatory Indicators and Postoperative Complications in Elderly Patients with Primary Spontaneous Pneumothorax
Authors: Xiao Fangjie , Xia Yan
Published: February 2024

Background: In thoracoscopic surgery under spontaneous respiration, patients could breathe spontaneously during surgery without the need for mechanical ventilation via tracheal intubation. This technique can effectively avoid the injuries caused by tracheal intubation and mechanical ventilation and the side effects of muscle relaxants, thus reducing postoperative complications and benefitting patients. This study aims to explore the application of thoracoscopic surgery under spontaneous respiration in the elderly with primary spontaneous pneumothorax (PSP) and its effect on inflammatory indices and postoperative complications. Methods: The medical records of 181 elderly patients with PSP who underwent thoracoscopic surgery in our hospital from June 2021 to June 2022 were chosen for retrospective analysis. After excluding 15 patients who did not meet inclusion criteria, 80 patients receiving spontaneous respiration via laryngeal mask ventilation were included in the study group and 86 patients undergoing pulmonary ventilation via single-lumen tracheal intubation were included in the control group in accordance with the different schemes used in the surgery. Preoperative anaesthesia induction, surgical and hospitalisation times were compared, and the haemodynamics and inflammatory indices and complication incidences of the two groups were analysed. Results: Recovery time and hospitalisation time significantly differed between the two groups (p < 0.001). Compared with the control group, the study group had significantly lower mean arterial pressure at T2 and faster heart rates at T2 and T3 (p < 0.001). At T5, T6 and T7, the levels of interleukin-6, interleukin-8 and C-reactive protein in the study group were significantly lower than those in the control group (p < 0.05). The incidence of intraoperative and postoperative complications did not significantly differ between the two groups (p > 0.05). Conclusion: Thoracoscopic surgery under spontaneous respiration is safe and effective in the treatment of elderly patients with PSP. It reduces the levels of inflammatory factors and accelerates postoperative rehabilitation, showing certain value for clinical promotion.