Modeling of Internal Combustion Engine Ignition Systems with a Circuit Containing Fractional-Order Elements

This paper discusses the research and analysis of the dynamics of high-voltage generating systems. The test subject is an ignition system modelled by a set of two induction coils with an open ferromagnetic core that constitutes an ignition coil. The essence of the tests involved the application of magnetic coupling of the fractional order that enabled taking into account the non-idealities of the coils and the connector that implements the ignition point. The paper contains the results of a theoretical analysis, supported by digital simulations. The conducted experiments confirm the purposefulness of the conducted analyses and the possibility of modeling real objects based on circuits with fractional-order elements.

Metode Demonstrasi Untuk Meningkatkan Hasil Belajar Pada Pembelajaran Simulasi Digital

There are several factors that affect student learning outcomes. Broadly speaking, it is divided into two, namely endogenous or internal factors and exogenous or external factors. The purpose of this study is to improve digital simulation learning outcomes through the demonstration method for class X students of Islamic Vocational School 1 Blitar City in the 2019/2020 academic year. This research is a classroom action research (CAR) which was carried out for 2 cycles. The subjects of this study were students of class X Islamic Vocational School 1 Blitar City for the 2019/2020 academic year, totaling 40 people. The results showed that the application of the demonstration method could improve the learning outcomes of digital simulations in class X Islamic Vocational School 1 Blitar City for the 2019/2020 academic year.

Integrated Study of the Thiocyanate Anion Electrooxidation by Electroanalytical and Computational Methods

The mechanism of the electrochemical oxidation of thiocyanate anion in acetonitrile was studied by cyclic voltammetry, chronoamperometry, electrolysis, digital simulations and quantum chemical calculations. The experimental data indicated the complex character of the reaction mechanism, which includes reactions of thiocyanate anion with the products of its oxidation, thiocyanate radical and thiocyanogen. It was proposed that the last reaction takes place in the reduction of thiocyanogen as well. The DFT PCM-SMD M06–2X/aug-cc-pVQZ calculations show that the reaction of thiocyanate anion with thiocyanate radical • and disproportionation of thiocyanogen anion radical are thermodynamically favorable. The effects of the mentioned reactions on the shape of the curves of cyclic voltammetry and chronoamperometry as well as that of the mass transfer regime are discussed.

A Software Shell for Remote Creation and Use in the Educational Process of Digital Simulations of Diagnostics and Treatment of Patients

The widespread introduction of virtual computer simulations (VCS) in the educational process is limited by the tools’ market for their development. The created software shell consists of three functionally different modules: creating and editing video conferencing; use of videoconferencing; monitoring of the educational process. The developed software shell has remote access and can become the main tool for the repository of virtual computer simulations. Currently, videoconferencing in the field of cardiology has been created as a potential digital base for practical clinical studies and accreditation.

A Simple Contrast Matching Rule for OSEM Reconstructed PET Images with Different Time of Flight Resolution

Background: Time-of-Flight (TOF) is a leading technological development of Positron Emission Tomography (PET) scanners. It reduces noise at the Maximum-Likelihood solution, depending on the coincidence–timing–resolution (CTR). However, in clinical applications, it is still not clear how to best exploit TOF information, as early stopped reconstructions are generally used. Methods: A contrast-recovery (CR) matching rule for systems with different CTRs and non-TOF systems is theoretically derived and validated using (1) digital simulations of objects with different contrasts and background diameters, (2) realistic phantoms of different sizes acquired on two scanners with different CTRs. Results: With TOF, the CR matching rule prescribes modifying the iterations number by the CTRs ratio. Without TOF, the number of iterations depends on the background dimension. CR matching was confirmed by simulated and experimental data. With TOF, image noise followed the square root of the CTR when the rule was applied on simulated data, while a significant reduction was obtained on phantom data. Without TOF, preserving the CR on larger objects significantly increased the noise. Conclusions: TOF makes PET reconstructions less dependent on background dimensions, thus, improving the quantification robustness. Better CTRs allows performing fewer updates, thus, maintaining accuracy while minimizing noise.

Multisensory VR for Delivering Training Content to Machinery Operators

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 simulations techniques for operators training. The research work presented in this paper concerns the development of a multisensory Virtual Reality environment 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. It has been developed an application that allows user to navigate the laboratory, to approach a machine and learn about how to operate it and also what PPE to use while operating. Specifically, the paper describes the design and implementation of the application.

Artifacts 1. Definition

In this paper I present a definition of artifact based on cases of philosophical and scientifical use: anthropogenic abiotic virtual or real object with meaning and/or function. This definition is proposed in a new dimension: real–virtual, which purports to replace the classical opposition material–ideal as a better way of defining what an artifact is. I consider as virtual here not only digital simulations, but all sign forms. I show that my definition works better in explaining artifacts. I follow empirical science as a technique of studying artifacts, and subscribe to the anthropological paradigm.

Modern approaches to learning biotechnologies in the conditions of digitalization of technological education

The article discusses approaches to teaching the "Biotechnology" module in modern technological education in the context of its digital transformation. On the example of using digital simulations and models, the methodological aspects of using educational tools that allow organizing the interactive cognitive activity of students when caring for plants are described. The experience of using a remote controlled hydroponics system in technology lessons is described. A description of the means and tools, software for the remote hydroponics system and a methodology for constructing technology lessons for growing indoor and vegetable plants are given. It is noted that the creation and application of a hydroponics system is a unique example of interdisciplinary integration of knowledge in ecology, biology, informatics and technology. The proposed approaches to the use of modern digital means make it possible to activate the cognitive activity of students in the study of modern biotechnologies and in practice to apply basic knowledge of programming.

Augmented reality learning: education in real-world contexts

What is it? Augmented Reality (AR) bridges the real and the digital. It is part of the Extended Reality (XR) spectrum of immersive technological interfaces. At one end of the continuum, Virtual Reality (VR) immerses users in fully digital simulations which effectively substitute for the real world. At the other end of the continuum, AR allows users to remain immersed in the real world while superimposing digital overlays on the world. The term mixed reality, meanwhile, is sometimes used as an alternative to AR and sometimes as an alternative to XR.

Digital Simulations as Approximations of Practice: Preparing Preservice Teachers to Facilitate Whole-Group Discussions of Controversial Issues

The public schoolhouse is one of the few remaining public spaces in which citizens may routinely gather to discuss controversial issues. Furthermore, it is social studies classrooms and teachers, in particular, that bear the moral imperative to ensure such civic discourse takes place. Nevertheless, many social studies teachers refrain from centering such discussions in their classrooms, often for fear of reprisal should these discussions go awry. It thus falls to social studies teacher educators to rethink how we prepare future teachers. This paper reports on a study that incorporated digital simulations of controversial issues into three preservice social studies teacher preparation methods courses to help develop high-leverage practices associated with leading whole-group discussions. Case study analysis suggests participants developed greater fluency with the teacher moves they practiced in the simulation. Accordingly, participants’ developed greater confidence with and perceived importance of facilitating discussions of controversial issues in their future classrooms. Implications and directions for future research are discussed.