Desarrollo de un simulador de la corriente funny del nodo sinusal para la enseñanza-aprendizaje

Las células del nodo sinusal generan la principal actividad eléctrica marcapaso del corazón. La actividad marcapaso se debe a la presencia de la corriente funny (If). Esta corriente iónica es entrante y se activa con la hiperpolarización en rangos de voltaje presentes durante la fase de despolarización diastólica; contrario a la mayoría de las corrientes iónicas que se activan con la despolarización. El canal funny es permeable a iones Na+ y K+. Generalmente, en el curso de biofísica a nivel de licenciatura los alumnos conocen algunos canales dependientes de voltaje del tipo de Hodgkin y Huxley que se activan con la despolarización. Sin embargo, no se estudia ningún canal que se active con una hiperpolarización. En este trabajo se diseñó y desarrolló un simulador para el estudio y comprensión de la corriente funny presente en el nodo sinusal del conejo. El simulador fue programado en lenguaje Visual Basic ver. 6.0 para ambiente Windows® de XP a Windows® 10. El usuario puede realizar los experimentos con la técnica de fijación de voltaje, modificar las variables y concentraciones de Na+ y K+ externos y observar el efecto en la amplitud de If y la cinética de la curva I-V. Se recomienda su uso como material didáctico de apoyo durante los cursos de biofísica y fisiología en una sala de cómputo o a distancia en cualquier computadora personal con recursos mínimos. The sinus node cells generate the main electric pacemaker activity of the heart. The pacemaker activity is due to the presence of the current funny (If). This ionic current is incoming and is activated with hypolarization in voltage ranges present during the diastolic depolarization phase, contrary to most ionic currents that are activated by depolarization. The funny channel is permeable to Na+ and K+ ions. Generally, students enrolled in the biophysics course at the undergraduate level are familiar with some voltage-gated channels of the Hodgkin and Huxley type. However, no channel that is activated by hiperpolarization is studied. In this work, a simulator was designed and developed for the study and understanding of the funny current present in the sinus node of rabbits. The simulator was programmed in Visual Basic Language ver. 6.0 for Windows® environment from XP to Windows® 10. The user can perform the experiments with the voltage clamp technique, modify the variables and concentrations of external Na+ and K+ and observe the effect on the amplitude of If and the kinetics of the curve I-V. It is recommended to be used as a support didactic material during biophysics and physiology courses in a computer room or remotely on any personal computer with minimal resources.

Development of program-driven plug-in for conical counter-rotating twin screw based on SolidWorks

Owing to the existence of the cone angle, the size of a conical counter-rotating twin screw continuously changes along the axis, so it is not easy to model using SolidWorks. In this study, the parametric design of the modeling process is completed based on the Visual Basic language and a program-driven method. Finally, the SolidWorks program plug-in and user interface are developed to complete the automatic generation of the three-dimensional model of a conical counter-rotating twin screw.

Utilizing the ATM technology in e-distance learning

<p>There is an Increasing demand for the education in the field of E-learning specially the higher education, and to keep contiuity between the user and the course director in any place and time. This research presents a proposed and simulation multimedia network design for distance learning utilizing ATM technique. The propsed framework determines the principle of ATM technology and shows how multimedia can be integrated within E- learning conteext. The first part of this research presents a theoretical design for the Electricity Department, university of technology. The purpose is to illustrate the usage of the ATM and Multimedia in distance learning process. In addition, this research composes two entities: Software entity by using image, sound and a mix between them to be transfered across the ATM network.. The MATLAB was used to validate the implementation of the required design objectives: (hardware entity) where a prototype is designed (experimental trial) , which aims to carry out the connectivity process between the user and course director, where multiple PCs are connected via unshielded twisted pair (UTP) and a web camera with microphone have been attached to PCs. To finalize this stage, an interface is implemented to show the data transmission process for multimedia by the ATM network and it has been realized through the Visual Basic language. Finally, to validate the level of success by using the ATM technique, some important factors have been determined through the analysis phase, which are: time delay, throughput and efficiency. The propsed design manages to minimize the impat of noise and improve the throuput ratio by 30% while minizing the delay with a ratio of 22%.</p>

Software analizador de sistemas mecánicos desarrollado en la Universidad Tecnológica de Nayarit

This research, has as its main purpose to have developed a tool of free use available to students, educators and professionals through a software that facilitates the teaching and learning process. This one was programmed with the Visual Basic language (VB), being a tool of effective and high-performance software development technologies from Microsoft. It will be able to perform various analyses of mechanical systems in transmissions, and its purpose allows the user to calculate, understand and compare the analyzes in an effective and orderly way to implement them at convenience. The contributions of the project can be granted mostly to the educational and work environment, being destined to apply engineering in pedagogical and labor sectors. The project is oriented to the needs of knowing characteristics of a mechanical system to implement its optimal functioning through this software. All this is justified from the obtaining of knowledge in the academic trainingand a rigorous investigation of mechanical systems, programming and design, the research considers information coming from professors of the university, web forums and magazines.

Development of an Analytical Software for Communication management in Project Management Offices

This study deals with the problem of communication management system in Project Management Office (PMO) in Iraqi construction sectors. The main objective of this study was to estimate and develop the Communication Management System (CMS). Methodology: Visual basic language has been used to build analytical software which is (Communication Management Software). This software displays the overall information in every single project management office followed by the evaluation of the actuality of communication methods with two arithmetic equations so that estimate the effectiveness and barriers of Communication Management System. Statistical Package for the Social Sciences, SPSS vr.23.0 was used for Data analysis and determining the equations to calculate the efficiency and barriers of PMO; Developed Computer Software: Based on the data analysis results, it will provide computer software to calculate the efficiency and barriers of PMO and validation and verification of computer software followed by the discussion of the results. CMS was weighed depending on a questionnaire of ten project management engineers in Iraqi construction zones. Results showed that 100% stated to the simple usage of the software, and 75% of the research sample proven that the software discussed three matters which are cost, time, and performance. The result expressed that the half of the studied sample proved the CMS accuracy to valuation certainty of CMS. The 55% of the resulting sample expressed is very good software for both increasing the performance in the middle of the members of the Project Management Office. Evaluation of the proposed software indicated that it is effective in communication management in Project Management Office (PMO).

Optimal design of the rotor geometry of line-start permanent magnet synchronous motor using the bat algorithm

In this paper an algorithm for the optimization of excitation system of line-start permanent magnet synchronous motors will be presented. For the basis of this algorithm, software was developed in the Borland Delphi environment. The software consists of two independent modules: an optimization solver, and a module including the mathematical model of a synchronous motor with a self-start ability. The optimization module contains the bat algorithm procedure. The mathematical model of the motor has been developed in an Ansys Maxwell environment. In order to determine the functional parameters of the motor, additional scripts in Visual Basic language were developed. Selected results of the optimization calculation are presented and compared with results for the particle swarm optimization algorithm.

Implementation of Expert System Modeling to Thermal-Hydraulic Design of Hydraulic Systems

Thermal and hydrodynamic concepts are of a vital importance; therefore their assessments are unavoidable for the purpose of hydraulic systems. The present study implements the practical updated knowledge of the expertise for both of the hydraulic and thermal fields in an expert system model. This is implemented in order to improve the performance of hydraulic system by considering the thermal effect on the hydraulic system operation. Accordingly, a computer program (Hydraulic System Calculations), designated as (HSC) implements a Visual Basic language in the Microsoft Visual Studio 2010 software has been built. Regardless of the design requirements, the code is capable to deal with (18) possible connection types of the actuators, in series or parallel, arrangements. The suggested code provides the designer with a number of choices, different kind of connections, to resolve the problem of hydraulic oil overheating which may arise during the continuous operation of the hydraulic unit. As a result, the (HSC) is able to minimize the human errors, effort, time and cost of hydraulic machine design.

Development and Application of a Synchronous Belt Drive Design System

To solve the synchronous belt drive design and 3D modeling problem, a synchronous belt drive design system has been developed with the Visual Basic language and SolidWorks platform. Applications have shown that this system can realize design calculation of the synchronous belt drive and the 3D modeling of spare parts and assemblies like the small belt pulley, large belt pulley and synchronous belt, as required by the customer. Also, it has a user-friendly interface, handy operation, simple operation, and accurate design results, to effectively shorten the design period.