scholarly journals A short introduction to digital simulations in electrochemistry: simulating the Cottrell experiment in NI LabVIEW

2018 ◽  
Vol 8 (2) ◽  
pp. 171-181 ◽  
Author(s):  
Soma Vesztergom
Keyword(s):  
Graduate Students ◽  
Programming Language ◽  
Digital Simulation ◽  
Short Introduction ◽  
Simulation Techniques ◽  
Runge Kutta ◽  
University Lecturers ◽  
Digital Simulations ◽  
Theoretical Electrochemistry ◽  
Crank Nicolson

A brief introduction to the use of digital simulations in electrochemistry is given by a detailed description of the simulation of Cottrell’s experiment in the LabVIEW programming language. A step-by-step approach is followed and different simulation techniques (explicit and implicit Euler, Runge–Kutta and Crank–Nicolson methods) are applied. The applied techniques are introduced and discussed on the basis of Padé approximants. The paper might be found useful by undergraduate and graduate students familiarizing themselves with the digital simulation of electrochemical problems, as well as by university lecturers involved with the teaching of theoretical electrochemistry.

Accuracy contours in (nT, λ) space in electrochemical digital simulations

1991 ◽  
Vol 56 (1) ◽  
pp. 20-41 ◽  
Author(s):  
Dieter Britz ◽  
Merete F. Nielsen
Keyword(s):  
Finite Difference ◽  
Linear Sweep Voltammetry ◽  
Stability Factor ◽  
Dimensionless Time ◽  
Simulation Techniques ◽  
Rational Algorithm ◽  
The Stability ◽  
Transport Problems ◽  
Current Approximation ◽  
Digital Simulations

In finite difference simulations of electrochemical transport problems, it is usually tacitly assumed that λ, the stability factor Dδt/δx2, should be set as high as possible. Here, accuracy contours are shown in (nT, λ) space, where nT is he number of finite difference steps per unit (dimensionless) time. Examples are the Cottrell experiment, simple chronopotentiometry and linear sweep voltammetry (LSV) on a reversible system. The simulation techniques examined include the standard explicit (point- and box-) methods as well as Runge-Kutta, Crank-Nicolson, hopscotch and Saul’yev. For the box method, the two-point current approximation appears to be the most appropriate. A rational algorithm for boundary concentrations with explicit LSV simulations is discussed. In general, the practice of choosing as high a λ value when using the explicit techniques, is confirmed; there are practical limits in all cases.

Multisensory Virtual Reality for delivering training content to machinery operators

2021 ◽  
pp. 1-39
Author(s):  
Monica Bordegoni ◽  
Marina Carulli ◽  
Elena Spadoni
Keyword(s):  
Virtual Reality ◽  
Digital Simulation ◽  
Research Work ◽  
Learning By Doing ◽  
Protective Equipment ◽  
Training Method ◽  
Simulation Techniques ◽  
Machine Operators ◽  
Negative Factors ◽  
University Laboratory

Abstract The issue of training operators in the use of machinery is topical in the industrial field and in many other contexts, such as university laboratories. Training is about learning how to use machinery properly and safely. Beyond the possibility of studying manuals to learn how to use a machine, operators typically learn through on-the-job training. Indeed, learning by doing is in general more effective, tasks done practically are remembered more easily, and the training is more motivating and less tiresome. On the other hand, this training method has several negative factors. In particular, safety may be a major issue in some training situations. An approach that may contribute overcoming negative factors is using Virtual Reality and digital simulation techniques for operators training. The research work presented in this paper concerns the development of a multisensory Virtual Reality application for training operators to properly use machinery and Personal Protective Equipment (PPE). The context selected for the study is a university laboratory hosting manufacturing machinery. The application allows user to navigate the laboratory, to approach a machine and learn about how to operate it, and also to use proper PPE while operating a machine. Specifically, the paper describes the design and implementation of the application and presents the results of preliminary testing sessions.

Modern programming technologies. Language of 1C 8.3

2021 ◽  
Author(s):  
Eduard Dadyan
Keyword(s):  
Higher Education ◽  
Graduate Students ◽  
Programming Language ◽  
Educational Institutions ◽  
Federal State ◽  
Educational Standards ◽  
Higher Educational Institutions ◽  
Higher Educational ◽  
State Educational ◽  
Reference Form

The tutorial covers the issues of building the basics of the 1C 8.3 programming language. It is intended for both beginners and advanced users. The presentation of the material is divided into two sections. The first section provides the basics of the 1C 8.3 programming language for beginners. In the second section, the use of the 1C 8.3 language is given for advanced users — in a reference form, using specific examples. Meets the requirements of the federal state educational standards of higher education of the latest generation. For students of higher educational institutions studying in all areas of training and specialties, as well as for graduate students and students of the IPK.

Digital simulation of cyclic voltammetric curves by the implicit Crank-Nicolson technique

1984 ◽  
Vol 165 (1-2) ◽  
pp. 61-70 ◽  
Author(s):  
Jürgen Heinze ◽  
Michael Störzbach ◽  
John Mortensen
Keyword(s):  
Digital Simulation ◽  
Cyclic Voltammetric ◽  
Crank Nicolson

scholarly journals Practicality of Authentic Instruments Computer Competency Assessment for Students of Vocational High School

2020 ◽  
Vol 2 (1) ◽  
pp. 9-14
Author(s):  
Elsa Firdianis ◽  
Ambiyar Ambiyar ◽  
Wakhinuddin Wakhinuddin ◽  
M. Iksan Ardiyansyah ◽  
Yumn Jamilah
Keyword(s):  
Digital Simulation ◽  
Assessment Instrument ◽  
Competency Assessment ◽  
Design Development ◽  
Vocational High School ◽  
Research Subjects ◽  
Development Models ◽  
Implementation Evaluation ◽  
Effective Assessment ◽  
Digital Simulations

This study aims to develop authentic instruments in the assessment of Digital simulations to measure student learning skills that are practical and effective. This research uses Research and Development with ADDIE development models. Through the stages of analysis (analysis), design (design), development (development), implementation (implementation), evaluation (evaluation). The research subjects were students of class X SMK Negeri 05 Padang, digital simulation subjects. The research data was obtained through validation instrument sheets, practical questionnaires, and observations. The practicality test results show that the authentic assessment that was developed was very practical with the percentage of practicality of teachers on lesson plans being 88.3% and authentic assessments at 82.3%. This developmental research produced an authentic practical and effective assessment instrument that can be used by teachers in assessing students' skills in school in the learning process.

scholarly journals Current calculation of irreversible electrode reaction mechanismsin linear sweep voltammetry

2021 ◽  
Vol 9 (3) ◽  
Author(s):  
Ján Mocák ◽  
Estera Rábarová
Keyword(s):  
Chemical Reaction ◽  
Infinite Series ◽  
Digital Simulation ◽  
Linear Sweep Voltammetry ◽  
Electrode Reaction ◽  
Potential Range ◽  
Linear Sweep ◽  
Potential Region ◽  
Current Function ◽  
Simulation Techniques

Application of exponential infinite series gives highly accurate analytical solution contributing to the theory of linear sweep voltammetry for single scan experiments. We have calculated theoretical dimensionless current function (usually denoted as π1/2χ(bt)) at relevant potentials for irreversible charge transfer without a coupled chemical reaction. For this purpose several transformation techniques were used, which convert the derived infinite series into summable sequences. Since infinite series of further electrochemical mechanisms with irreversible electrode reaction have similar features (particularly those comprising preceding and catalytic chemical reaction), the same approach can be successfully applied also for further electrochemical mechanisms. The respective infinite series are divergent in the most important potential region at and after voltammetric peak therefore their transformation by Epsilon and Levin transform techniques was used. Necessary arbitrary precision arithmetic (APA) was implemented by UBASIC. The results were compared to the customary solution of Nicholson and Shain, who computed the current-potential curves by means of numerical solution of the integral equations but with a much lower precision. Our results were obtained in a broad potential range including the potential regions where the series are divergent. Obtained current functions are precise to 12 valid decimal numbers, which is utilizable for evaluation of the results achieved by various faster but less precise digital simulation techniques.

scholarly journals A Feasibility Solution of a Synchronous Generator for Optimisation of the System Power Stability using an Integrated Development Environment of Visual Basic-Excel

2020 ◽  
Vol 9 (3) ◽  
pp. 1261-1268
Keyword(s):  
Power Systems ◽  
Power System ◽  
Digital Simulation ◽  
Synchronous Generator ◽  
Power System Stability ◽  
System Stability ◽  
Development Environment ◽  
Runge Kutta ◽  
Mathematical Techniques ◽  
Computational Resources

Power systems are considered highly non-linear because the environment in which they operate keep changing and hence require iterative mathematical techniques to analyse them. Such changes have a resultant effect on the system`s stability. Fluctuations in parameters are experienced in loads across the networks of the system, generator`s outputs, network topology and other operating parameters. Practically, there is no analytical solution exists for solving the problem of stability. On the other hand, there are techniques available to obtain an acceptable approximate solution of such a problem, known as digital simulation. Runge-kutta method is one of these techniques which has been used broadly as it calculates every step in a sequence of sub-steps. The method relies on a complex mathematical modelling of the synchronous generator with the help of Park-Gorev`s transformation, for the sake of simplicity and intuitiveness the method is used to analyse and study the complex equations of the three-phase synchronous generator. Generally, the system is said to be stable if the opposing forces within it are balanced and at a perfect equilibrium. The aims of this research are to establish the effects of synchronous generator`s design and transient conditions upon power system stability with the help of Embedded Microsoft Excel Sheet based on Power System Stability Analysis (EMES-PSS), using the Runge-Kutta integration method. The study has proved that EMES-PSS can find the limits of Salient and Non-Salient machines stability when changing their essential parameters. The optimisation solutions of the power system stability problem can be achieved by using basic computational resources. The software can also be used on a number of modern tablets e.g., Apple`s tablets.

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