Development of Electrical Circuit Learning Media Using Virtual Simulation

The Covid-19 pandemic has had a major impact on the world of education. One of the impacts is related to the learning process of electrical circuits. Online lectures make students have difficulty in studying electrical circuit courses. An appropriate learning media is needed as a solution to overcome these problems. This study aims to develop electrical circuit learning media using virtual simulations and determine the feasibility of applying the media. This type of research is research and development with the ADDIE model. The stages of development carried out are Analyze, Design, Development, Implementation, and Evaluation. The research was conducted at the Electrical Engineering Education Study Program, Faculty of Engineering, UNY. The virtual simulation used is a Falstad circuit simulation. This simulation can be accessed online or offline. In this research, the focus is on developing learning media using online Falstad simulation. The results showed that 1) the electric circuit learning media using virtual simulations can run well, 2) based on user trials, the electrical circuit learning media using virtual simulation is classified as very feasible.

Ovarian Transposition Strategy in Patients with Cervical Cancer Who Undergo Pelvic Radiation: Proposal of Ovarian Placement Based on Virtual Simulations

Objective: To establish a proposal for the location for ovarian transposition, considering different irradiation techniques and time to ovarian failure. Methods: Patients with cervical cancer in childbearing age submitted to adjuvant radiotherapy were selected. Delineation of simulated positions of the ovaries and pelvic radiation planning was done in CT, with three techniques: 3D conformal radiotherapy, intensity-modulated radiotherapy, and volumetric modulated arc radiotherapy. In order to correlate the ovaries maximal doses with the time to ovarian failure, the authors have used the one adaptation of Wallace model that predicts oocytes survival rates after radiation exposure. Results: Thirteen patients who were being treated between 2008 and 2017 were studied. When the ovaries were positioned 10 cm cranially from the sacral promontory, the pelvic radiation entails a decrease of 20% in the time to ovarian failure compared with that expected for a female at the same age without irradiation exposition. The placement of the ovaries <5 cm cranially from the sacral promontory results in a decrease >90%. There was no difference in time to ovarian failure between the radiation treatment techniques tested: 3D conformal radiotherapy, intensity-modulated radiotherapy, and volumetric modulated arc radiotherapy (p=0.197). Conclusions: The present study, based on virtual simulations, is the first to use the sacral promontory as a reference for a proposal of ovarian location with transposition. The authors have correlated the position of the ovaries and percentage of decrease in time to ovarian failure. These findings can potentially improve the management and counselling of patients with cervical cancer in childbearing age and deserve clinical validation.

Development of Virtual Emulation Modelling on the Reconfigurable Hot Forming Process and Its Digital Twin Implementation Perspectives

In this paper, the development of virtual emulation modelling is presented on the reconfigurable hot forming process and its further implementation for the associated digital twins. When validating the developed Digital Twin system, it is essentially important to test the digital twin prior to its connection to a real physical asset especially from a safety and efficiency prospective. The development is focused on digital virtual emulation of the reconfigurable hot forming process, which can emulate the physical element as the means of validating the digital twin system with the throughout-digital virtual simulations and underlying results.

An Approach for the Transfer of Real Surfaces in Finite Element Simulations

Virtual simulations are a relevant element in product engineering processes and facilitate engineers to test different concepts during early phases of the development. However, in tribological product engineering, simulations are hardly used because input data such as material behavior are often missing. Besides the material behavior, the surface roughness of the contacting elements is relevant for tribological systems. To expand the capabilities of the virtual engineering of tribological components such as bearings or brakes, the hereby presented approach allows for the depiction of real rough surfaces in finite element simulations. Rough surfaces are scanned by a white-light interferometer (WLI) and further processed by removing the outliers and replacing non-measured samples. Next, a spline generation creates a solid body, which is imported to CAD software and afterwards meshed with triangle and quadrilateral elements in different sizes. The results comprise the evaluation of six differently manufactured (turned, coated, and pressed) real surfaces. The surfaces are compared by the deviations of the roughness values after measuring with the WLI and after meshing them. Furthermore, the elements’ aspect ratios and skewness describe the mesh quality. The results show that the transfer is dependent upon deep cliffs and large Sz values in comparison to the lateral expansion.

A Revisited Conceptual Change in Mathematical-Physics Education from a Neurodidactic Approach: A Pendulum Inquiry

Learning physics today contains a strong algebraic component, which does not contribute to making an effective conceptual change due to several misunderstandings and misconceptions that students have. Inquiry-based science education methodology (IBSE) is a solution, as well as model-based inquiry (MBI), but no agreement exists regarding which one is the best option. The contribution of both new neuroscientific and cognitive psychology advances is necessary. All these components can be arranged within a transdisciplinary discipline called Neurodidactics. This work presents a neurodidactic proposal to achieve an effective conceptual change. The study involves 171 undergraduate university students and is based on an experimental design (control and experimental groups) with pre- and post-test questionnaires. Results will show the importance of experimentation in mathematical-physics sessions, as well as the importance of visuospatial abilities and the inquiry component offered by the different resources used (virtual simulations and multimedia) in order to obtain a model. In addition, the role of transdisciplinary orientation and the importance of conceptual modeling was tested, obtaining an essential contribution to balance the normally non-significant algebraic approach of physics science, offering altogether a possible new path for scientific learning.