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This paper analyses rock mass quality based on an engineering geological investigation conducted at the Rongkong diversion tunnel, Luwu Utara Regency, South Sulawesi, Indonesia. The research area's surface and subsurface were mapped geologically, and drill cores were evaluated along the tunnel. In addition, laboratory test data further reinforced these investigations. This study aims to evaluate the characteristics of the rock mass in the tunnel using the Rock Mass Rating (RMR) method. However, in cases involving weak rock and complex geology, another alternative approach is known as the Geological Strength Index (GSI) method. The results indicated that the Rongkong diversion tunnel under investigation primarily comprised lithological, including granodiorite and schist. The rock mass shows varying degrees of weathering, ranging from slight to complete. The study area's RMR rock mass values ranged from 33 – 59 (poor to fair quality), while the GSI values ranged from 15 – 58 (very poor to good quality). The effect of weathering degree can be one of the factors causing poor rock mass quality. Furthermore, this paper also examines the correlation between RMR and GSI. The equation GSI = 1.66RMR – 39.44 (R² = 0.94) was obtained from analysis of the correlation between GSI and RMR in the research area. Therefore, the obtained correlation results may serve as recommendations for other regions exhibiting comparable lithology and rock mass characteristics within the scope of this study. [ABSTRACT FROM AUTHOR]

Safety and reliability are critical aspects of engineering and in our day-to-day life. In this paper, the possibilities of a new circuit protection technology namely Solid-State Circuit Breakers are explored. The various faults that can occur in low-voltage DC microgrids are investigated and the prospects of utilizing this technology to mitigate these risks are investigated. This research work also attempts to integrate the circuit protection methodology with energy monitoring to further enhance the overall capabilities of the system. To utilize this technology, a hardware prototype for a 48V DC microgrid setup capable of handling up to 500W of power was created. The system has two individual channels that distribute power to two types of loads, essential and non-essential respectively. Multiple modes are implemented to effectively tackle different faults, and remote monitoring was deployed through novel communication protocols. A series of tests was run to assess the system's overall performance under various operating conditions. This system demonstrates how two diverse technologies can be successfully merged to provide a novel and superior product. [ABSTRACT FROM AUTHOR]

Communication technologies have become a critical element of engineering and our day-to-day lives. In this paper, the complementary possibilities of two nascent technologies, namely LoRaWAN and ESP-NOW are explored. The LoRaWAN protocol is best suited for long-range communication, while ESP-NOW is ideal for short-range communication. The uniqueness of this research endeavor is focused on how both of these outstanding approaches can be strategically used in tandem, therefore capturing the best of both worlds. A proof-of-concept hardware system was designed and implemented in a 48V DC microgrid environment to observe the overall performance. The system was also deployed in a real-life setting to validate this work. From the experimental outputs, it was observed that ESP-NOW could be used to receive data from up to 20 devices in a 40-meter radius, while LoRaWAN could send data to a gateway as far as 35 kilometers away. All of this was accomplished while using only milliwatts of power. Therefore, demonstrating the effectiveness of combining these two divergent communication approaches together, in order to generate a convergent result. [ABSTRACT FROM AUTHOR]

CaSO4 occurs in various phases. The most common and stable phase is the gypsum phase and anhydrite phase. It is well known that the different phases show different luminescence properties. Ce3+ can be easily induced in the anhydrite phase of CaSO4 at 400°C in a redox environment. However, at various temperatures, the photoluminescence of CaSO4 doped with cerium changes its intensity. The molar concentration of the compound and dopant also plays an important role in forming the distinct phases of CaSO4: Ce. A substantial change in CaSO4:Ce phases occurred when it is prepared in the controlled environment. The computational calculations also show that the concentration of dopants plays a vital role in changing the phase of CaSO4. This also changes the photoluminescence properties. The preparation procedure, photoluminescence spectra, and the distinct phases are discussed in this paper. [ABSTRACT FROM AUTHOR]

The 4th International Conference on Current Trends in Materials Science and Engineering 2022 (CTMSE 2022) was held virtually from July 28 to July 30, 2022. The conference aimed to provide a platform for researchers, scientists, and academicians from around the world to present research papers on recent developments in materials science and engineering. It focused on new advances in various areas within the field and aimed to improve society and everyday life. The conference was organized by the Institute of Engineering and Management in Kolkata, India, which is known for its commitment to excellence in education and innovation. The organizers expressed gratitude to the speakers, session chairs, reviewers, and committee members for their support, and hoped that the conference proceedings would be helpful for young researchers and experts in the field. [Extracted from the article]

The 9th International Conference on Advanced Material Engineering & Technology (ICAMET 2021) is a virtual conference that serves as a platform for researchers, engineers, and scientists from around the world to present their new advances and research results in the field of advanced materials engineering, science, computer, management, and technology. The conference was co-organized with the Universitas Negeri Makassar, and all papers from ICAMET 2021 will be published in Scopus Indexed Conference Proceedings. The objectives of the conference are to facilitate the exchange of ideas and research findings, provide an overview of the latest advances in the field, and foster collaborations between researchers. [Extracted from the article]

The 2nd International Conference on Technology, Informatics, and Engineering (ICon-TINE) was held as a hybrid conference, with both in-person and virtual attendees. Over 140 papers were submitted from research and educational institutions in India, Indonesia, Taiwan, and Malaysia. The conference aimed to provide a platform for researchers, scholars, and practitioners to discuss and present their latest findings in engineering, science, and technology. The conference covered various fields, including mechatronics, robotics, computational intelligence, data science, computer science, electrical and control engineering, and more. The hope is that the conference results will contribute significantly to the knowledge in these scientific fields. [Extracted from the article]

This document is a preface to the proceedings of the 1st International E-Conference on Biopolymer, Smart Materials, and Engineering Materials 2023 (ICBSEM2023). The conference took place on April 20th and 21st, 2023 at Wollo University, Kombolcha Institute of Technology in Ethiopia. The purpose of the conference was to bring together experts from academic institutions, industries, and research organizations to share knowledge and experiences in the field of mechanical engineering education and research. The conference included 58 papers, plenary lectures, and invited talks, providing opportunities for discussion and bridging the gap between different fields. The document acknowledges the support and encouragement from various individuals and organizations involved in organizing the conference. [Extracted from the article]

The 2nd International Conference of Sustainable Earth Resources Engineering (SERiES2022) was held in Bayview Hotel Langkawi Island, Malaysia from October 18 to 20, 2022. The conference aimed to bring together experts from various engineering backgrounds to discuss and present their research on future sustainable earth resources and engineering technology. The conference included plenary lectures, keynote speakers, presentations, ice-breaking sessions, and field visits. The conference proceedings include 42 selected papers out of 97 abstracts and scientific articles from 7 countries. The chairman of the conference expressed gratitude to the individuals, organizations, and volunteers who contributed to the success of the event. [Extracted from the article]