Indonesian Review of Physics

Implantable Antennas for Biomedical Purposes: State-of-the-Art, Challenges, and Future Directions

2024-02-07T02:33:17+00:00

This article provides a comprehensive review of implantable antennas in the context of their application within the biomedical field. Through a systematic exploration of cutting-edge developments and associated challenges, a thorough understanding of antenna design, performance considerations, and safety implications is obtained. The investigation thoroughly examines diverse antenna types, including planar, microstrip, fractal-geometry, and others, elucidating the design considerations that govern their suitability for a wide array of implantable medical devices (IMDs). Substrate and material choices are critical factors influencing antenna efficiency and biocompatibility. The utilization of available frequency bands is evaluated, highlighting the inherent tradeoffs that dictate their applicability in biomedical applications. Additionally, the promising domain of rectenna technology is explored for its potential in sustainable energy harvesting. The discourse on miniaturization techniques underscores their pivotal role in enabling the seamless integration of antennas within intricate implant structures. Safety aspects are paramount, encompassing metrics such as specific absorption range (SAR), maximum permissible exposure (MPE) limits, and thresholds for localized temperature changes. The intricate interplay between human body effects and antenna performance is briefly elaborated. Methodologies for thorough evaluation, spanning computer simulations, as well as experiments in in vivo and in vitro scenarios, are discussed for their pivotal role in iteratively refining antenna functionality.

Review: Synthesis and Characterization of Dye Combination as Photosensitizer Dye-Sensitized Solar Cell

2023-01-04T03:05:18+00:00

The growing energy demand has driven extensive research into developing renewable technologies. Among these innovations is the production of Dye-Sensitized Solar Cells (DSSCs) utilizing photosensitizers derived from natural materials that are readily available, easy to extract, and environmentally sustainable. Although their efficiency is lower than that of synthetic alternatives, blending natural pigments enhances the absorption spectrum. The combined pigments yield higher efficiency than individual dyes. This review examines the synthesis and characterization processes for using combined dyes as photosensitizers in DSSCs, covering stages such as dye extraction, TiO₂ deposition, and various analytical tools. Additionally, it highlights research findings that suggest promising avenues for future exploration in dye combinations.

The Mismatch between Knowledge and Belief: A Comparative Study of Students' Conceptual Understanding and Confidence in the Topic of Center of Gravity

2024-11-10T02:29:41+00:00

This study explores the discrepancy between conceptual understanding and confidence levels among mechanical engineering students regarding the concept of the center of gravity. Despite its importance in physics, students frequently hold misconceptions about the center of gravity, particularly in irregular objects and composite shapes. Using a novel five-tier diagnostic instrument, this research measured students' understanding and confidence in their responses and reasons. The findings revealed that 12% of students had misconceptions and revised their personal thoughts as the most recurring error source. Furthermore, a sizeable group of students demonstrated an illusion of knowing something high wherein they were very sure but wrong! This should serve to prove the importance of teacher educational reforms, which support overturning misconceptions and correctness of levels of confidence of students to a corresponding realistic base. Knowledge and beliefs were further intertwined through the analysis of the Rasch model, in a bid to understand this relationship. The reported results also increase knowledge in physics instruction because they provide practical ways of minimizing misconceptions as well as an effective teaching profession, especially on the topic of center of gravity. This paper highlights how addressing both conceptual and psychological factors when students are learning can help them in physics education. By integrating psychological and conceptual dimensions into teaching strategies, educators can enhance students' grasp of foundational concepts like the center of gravity and improve their overall learning outcomes in physics and engineering contexts. This research contributes to the development of evidence-based instructional practices aimed at minimizing misconceptions and fostering deeper, more accurate learning.

Probability and Heisenberg Uncertainty of He+ at Quantum Numbers n≤3

2024-12-11T07:03:26+00:00

The purpose of this study is to analyze the probability and uncertainty of electron linear momentum in with the Heisenberg uncertainty approach. Measurement of the position and momentum of atomic electrons is probabilistic. The probability and uncertainty of electron linear momentum are carried out analytically and simulations of the normalized radial wave function of hydrogenic atoms. have only one electron orbital so they can be viewed as hydrogenic atoms. The probability and uncertainty of electron linear momentum in decrease with increasing values of the principal quantum number n≤3. While the uncertainty of the electron position is increasing. The results of this study are in accordance with the characteristics of position and linear momentum that are not commutable. The increase in the value of the main quantum number means that the position of the electron against this is getting farther and the speed in the orbital is getting smaller.

Magnetic Field on A Square Helmholtz Coil Experiments Using Remote Laboratory

2024-05-31T05:27:26+00:00

Experiments have been conducted on the distribution of the magnetic field on a square Helmholtz coil. The experiments were performed remotely using a Remote Physics Laboratory (R-PhyLab). This experiment measures the distribution of the magnetic field around a box-shaped Helmholtz coil. There are two variations of the distance between the coils, which are (1) half of the side length of the coil, and (2) equal to the side length. Based on the measurement and data analysis, good results were obtained, which showed that the experimental value was in accordance with the theoretical value based on the Biot-Savart law. It can be concluded that the remote experiment using R-PhyLab is very suitable for use in learning physics.