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Nitrogen Pretreatment of Growth Substrates for Vacancy-Saturated MoS2

ACS Applied Materials and Interfaces 2023年第36期15卷 42746-42752页

作者： Yao, Yu-Chi Wu, Bo-Yi Chin, Hao-Ting Yen, Zhi-Long Ting, Chu-Chi Hofmann, Mario Hsieh, Ya-Ping Institute of Atomic and Molecular Sciences Academia Sinica Taipei10617 Taiwan Department of Physics National Taiwan University Taipei10617 Taiwan Graduate Institute of Opto-Mechatronics Department of Mechanical Engineering National Chung Cheng University Chia-Yi62102 Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University Taipei10617 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei10617 Taiwan

Two-dimensional transition-metal dichalcogenides (2D TMDCs) are considered promising materials for optoelectronics due to their unique optical and electric properties. However, their potential has been limited by the occurrence of atomic vacancies during synthesis. While post-treatment processes have demonstrated the passivation of such vacancies, they increase process complexity and affect the TMDC’s quality. We here introduce the concept of pretreatment as a facile and powerful route to solve the problem of vacancies in MoS2. Low-temperature nitridation of the sapphire substrate prior to growth provides a nondestructive method to MoS2 modification without introducing new processing steps or increasing the thermal budget. Spectroscopic characterization and atomic-resolution microscopy reveal the incorporation of nitrogen from the sapphire surface layer into chalcogen vacancies. The resulting MoS2 with nitrogen-saturated defects shows a decrease in midgap states and more intrinsic doping as confirmed by ab initio calculations and optoelectronic measurements. The demonstrated pretreatment method opens up new routes toward future, high-performance 2D electronics, as evidenced by a 3-fold reduction in contact resistance and a 10-fold improved performance of 2D photodetectors. © 2023 American Chemical Society

关键词： Molybdenum compounds

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A 22nm CMOS PFM Buck Converter Used in a 32-Bit RISC-V Microcontroller for IoT Applications 16

A 22nm CMOS PFM Buck Converter Used in a 32-Bit RISC-V Micro...

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16th IEEE Latin American Symposium on Circuits and Systems, LASCAS 2025

作者： Oliveira, Luiz H. N. Amaral, Wellington A. Haddad, Sandro A. P. Munoz, Daniel M. Barcelos, Eduardo A. Sotero, Vinicius V. M. Jonhson, Emmanuel K. M. Campagnucci, Pamela R. A. N. Lima, Luis V. N. Electronics Engineering Undergraduate Program Faculty of Gama Brazil Mechatronics Graduate Program University of Brasilia Faculty of Technology Department of Mechanical Engineering DF Brasilia Brazil

ISBN: (纸本)9798331522124

The demand for efficient power management solutions in electronic devices has increased significantly, especially for microcontrollers operating in low-power modes. This article presents the design and implementation of a Pulse Frequency Modulation (PFM)-based buck converter for applications in 32-bit microcontrollers using 22nm CMOS technology. The methodology involves the development of a Constant On Time (COT) architecture that maintains a fixed duration for the activation of the high-side MOSFET, using a monostable multivibrator to generate the necessary timing signals. The converter's performance was simulated under various load conditions and process corners to evaluate its efficiency and output characteristics. The results show that the proposed buck converter achieves high efficiency, with peak values above 95%, while maintaining a low output ripple. Specifically, the converter exhibits an efficiency of 93.4% at a load of 1mA, with output ripple voltages as low as 2.20 mV under ideal conditions. The contributions of this work lie in the advancement of PFM converter technology for modern microcontroller applications, demonstrating the potential of 22nm CMOS processes to improve power efficiency and performance. © 2025 IEEE.

关键词： CMOS integrated circuits

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Optimising degradation and mechanical performance of additively manufactured biodegradable Fe–Mn scaffolds using design strategies based on triply periodic minimal surfaces

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Smart Materials in Medicine 2024年第1期5卷 127-139页

作者： Dargusch, Matthew S. Soro, Nicolas Demir, Ali Gokhan Venezuela, Jeffrey Sun, Qiang Wang, Yuan Abdal-hay, Abdalla Alali, Aya Q. Ivanovski, Saso Previtali, Barbara Kent, Damon School of Mechanical and Mining Engineering The University of Queensland Advanced Engineering Building Bld 49 Staff House Rd St LuciaQLD4072 Australia Department of Mechanical Engineering Politecnico di Milano Via La Masa 1 Milan20156 Italy School of Dentistry The University of Queensland Herston Campus 4072 Australia Department of Engineering Materials and Mechanical Design Faculty of Engineering South Valley University Qena83523 Egypt Faculty of Industry and Energy Technology Mechatronics Technology Program New Cairo Technological University New Cairo - Fifth Settlement Cairo11835 Egypt School of Science Technology and Engineering University of the Sunshine Coast Maroochydore BCQLD4558 Australia

Additively manufactured lattices based on triply periodic minimal surfaces (TPMS) have attracted significant research interest from the medical industry due to their good mechanical and biomorphic properties. However, most studies have focussed on permanent metallic implants, while very little work has been undertaken on manufacturing biodegradable metal lattices. In this study, the mechanical properties and in vitro corrosion of selective laser melted Fe–35%Mn lattices based on gyroid, diamond and Schwarz primitive unit-cells were comprehensively evaluated to investigate the relationships between lattice type and implant performance. The gyroid-based lattices were the most readily processable scaffold design for controllable porosity and matching the CAD design. Mechanical properties were influenced by lattice geometry and pore volume. The Schwarz lattices were stronger and stiffer than other designs with the 42% porosity scaffold exhibiting the highest combination of strength and ductility, while diamond and gyroid based scaffolds had lower strength and stiffness and were more plastically compliant. The corrosion behaviour was strongly influenced by porosity, and moderately influenced by geometry and geometry-porosity interaction. At 60% porosity, the diamond lattice displayed the highest degradation rate due to an inherently high surface area-to-volume ratio. The biodegradable Fe–35Mn porous scaffolds showed a good cytocompatibility to primary human osteoblasts cells. Additive manufacturing of biodegradable Fe–Mn alloys employing TPMS lattice designs is a viable approach to optimise and customise the mechanical properties and degradation response of resorbable implants toward specific clinical applications for hard tissue orthopaedic repair. © 2023 The Authors

关键词： Porosity

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3D Facial Reconstruction Applied to Medical Cosmetology 5

3D Facial Reconstruction Applied to Medical Cosmetology

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5th IEEE Eurasia Conference on Biomedical engineering, Healthcare and Sustainability, ECBIOS 2023

作者： Hsieh, Sheng-Hsien Lin, Ming-Yi Chen, Ching-Han National Pingtung University of Science and Technology Program of Artificial Intelligence and Mechatronics Pingtung Taiwan Yuan Ze University Department of Computer Science and Engineering Taoyuan Taiwan National Central University Department of Computer Science and Engineering Taoyuan Taiwan

ISBN: (纸本)9798350320978

We present a high-accuracy 3D facial reconstruction system with the following features: real-time 3D facial reconstruction using exposure synchronization multi-camera, feature alignment to quantify facial differences, a software system based on a naked eye 3D display, and medical records for a 3D face database. The proposed system is novel and practical, and the algorithm and the hardware/software architecture improve the current non-quantitative communication status in medical aesthetics. The system achieves preoperative expectations, real-time recording and feedback during surgery, and postoperative tracking analysis, thus making doctor-patient communication more efficient. The facial data database records personal and quantitative beauty data and its changes, providing accurate medical and aesthetic treatment analysis for individuals. In addition, the collected data of different genders, ages, injection sites, and dosages contribute to the development of more accurate medical materials. With artificial intelligence and cloud architecture, we provide reliable data for medical aesthetics customers, helping them understand their medical aesthetic needs. Doctors also provide stable medical care quality to consumers through cloud data, and medical aesthetic consultants do not need to exaggerate medical effects excessively. They can inform customers of specific differences before and after surgery through precise data and provide visual communication and customer expansion to improve consultation conversion rates. © 2023 IEEE.

关键词： Visual communication

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A Novel Approach to Teaching Theory Control: Integrating STEM Education, Mobile Robot Simulation, and Bio-inspired Optimization

Operations Research Forum

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Operations Research Forum 2025年第3期6卷 1-24页

作者： Pastrana, M. A. Santana, M. S. Mendoza-Peñaloza, Jose Bautista, J. Pinto Lopera, Jesus Emilio Muñoz, Daniel M. Department of Mechanical Engineering Mechatronics Graduate Program University of Brasília Brasília Brazil Faculty of Science and Technology in Engineering Electronics Engineering Undergraduate University of Brasília Brasília Brazil Faculty of Engineering University of the Amazonia Florencia Colombia

In the context of engineering education, imparting control theory poses a significant challenge, especially for students lacking prior knowledge in the domain. This paper addresses this issue by introducing a novel approach for teaching control theory using STEM (Science, technology, engineering, and Mathematics) education, mobile robot simulator, and bio-inspired optimization. The paper identifies the lack of prior knowledge in control theory as a barrier to effective instruction and proposes a work approach that combines theoretical discussions, hands-on practical exercises, and tests, allowing students to progressively delve into control theory concepts. The study’s results demonstrate a statistical significance positive correlation between students’ performance in practical exercises and test outcomes. By providing a comprehensive framework for teaching control theory in a practical and engaging manner, this research contributes to bridging the gap in control theory education for students from diverse backgrounds.

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Dynamic Numerical Studies of a Rotorcraft Entering and Exiting Rectangular Tunnel 19

Dynamic Numerical Studies of a Rotorcraft Entering and Exiti...

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19th IEEE International Conference on e-Business engineering, ICEBE 2023

作者： Hsu, Uzu-Kuei Chang, Hong-Bin Tsai, Yao-Yu Tai, Chang-Hsien National Pingtung University of Science and Technology Bachelor Program in Artificial Intelligence and Mechatronics Kaohsiung City Taiwan National Pingtung University of Science and Technology Scerdc General Research Service Center Kaohsiung City Taiwan National Pingtung University of Science and Technology Dept. of Vehicle Engineering Kaohsiung City Taiwan

ISBN: (纸本)9798350325553

In recent years, the utilization of multi-rotor drones has seen a steady rise. Unmanned aerial vehicles (UAV) have found diverse applications, including aerial photography, transportation, military operations, and agriculture. The advent of these compact flying machines offers humanity a range of convenient and versatile choices across various sectors. Although unmanned aerial vehicles hold significant practical value, their stable flight is contingent on favorable weather conditions. Consequently, it becomes crucial to investigate the influence of environmental airflow on aircraft stability. This is particularly important for small machines like rotary-wing aircraft operating in confined spaces, where understanding the aerodynamic effects of the flow field is crucial to avert potential crashes. This study delves into the variations in the flow field during the entry and exit of a single rotor into a tunnel. Utilizing dynamic simulations, it examines how tunnels impact the rotor's flow field and analyzes thrust curves to understand dynamic rotor behavior. The study also explores the effect of vortex generation on the rotor and employs a simple square tunnel to assess how tunnel size and flight speed influence the rotor's flow field during flight. The findings hold potential as reference points to enhance flight stability during tunnel flights. © 2023 IEEE.

关键词： Vortex flow

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Prototype development of VR based personal zone defense practice equipment 4

Prototype development of VR based personal zone defense prac...

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4th IEEE Global Conference on Life Sciences and Technologies, LifeTech 2022

作者： Honma, Hiroki Iida, Yoshiaki Okumura, Yasuyuki Fujii, Katsuyuki Umehira, Masahiro Nanzan University Graduate Program of Mechatronics Graduate School of Science and Engineering Nagoya Japan Nanzan University Physical Education Center Nagoya Japan Nanzan University Faculty of Science and Engineering Department of Mechatronics Nagoya Japan Nanzan University Faculty of Science and Engineering Department of Electronics and Communication Technology Nagoya Japan

ISBN: (纸本)9781665419048

In a basketball game, players must act appropriately according to the position and movement of the player. This needs to be learned through team practice. Therefore, if we can build an environment that allows even one person to practice as a team, the efficiency of practice can be greatly improved. It is effective to use virtual reality (VR) technology to realize team practice alone. This paper proposes a VR-based basketball team practice learning system that provides VR environments similar to the actual team practice environments by arranging players in a virtual space. Focusing on zone defense practice, which is said to be difficult to learn even in team practice, we propose a practice system for orthodox 3-2 zone tactics. In addition, because the distance between the player and the surrounding VR player is important for this system, this paper presents the evaluation result of the 3D virtualization accuracy measured by the experiment. © 2022 IEEE.

关键词： Virtual reality

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Development and Control of the Stick Robot Using Three Reaction Wheels

Development and Control of the Stick Robot Using Three React...

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International Conference on Control, Automation and Systems ( ICCAS)

作者： Matee Vadrukchid Manukid Parnichkun Mechatronics Program School of Engineering and Technology Asian Institute of Technology Bangkok Thailand

A prototype of a stick robot with three reaction wheels is developed. Its balancing control is proposed in this paper. The stick robot is an inverted pendulum system using three reaction wheels as actuators. The robot can maintain itself at the upright position by applying appropriate motions of the three reaction wheels. A mechanical design, electrical circuit design, and control algorithm design are all required to build and balance the stick robot. The Linear Quadratic Regulator (LQR) is proposed to balance the robot. This control method attempts to minimize the cost related to the robot's states and control energy. This paper illustrates the dynamic model of the stick robot that has coupling effects between axes and can be used to describe the robot's behavior in terms of dynamics equation. From both simulations and experiments, the stick robot is able to stand on its own at the upright position. The angle in the x-direction has an error band of 0.1343 degree. It has a 0.2-second settling time. It also has 0.0011 degrees and 0.0335 degrees for mean square error and root mean squared error. The angle in the y-direction has an error band of 0.1186 degree. It has 0.14 second settle time and a mean square error of 0.0008 degree. It also has a root mean squared error equal to 0.0278 degrees. The results show an effective control performance of the proposed LQR.

关键词： Couplings Uniform resource locators Robust control Wheels Mean square error methods Mathematical models Robustness

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Study on Offshore Wind Energy Potential in the Gulf of Thailand

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International Journal of Renewable Energy Research 2021年第4期11卷 1947-1958页

作者： Sawasklin, Pariyes Saeung, Somchai Taweekun, Juntakan Energy Technology Program Faculty of Engineering Prince of Songkla University Hat Yai Songkhla90112 Thailand Department of Mechanical and Mechatronics Engineering Faculty of Engineering Prince of Songkla University Hat Yai Songkhla90112 Thailand

Thailand's Alternative Energy Development Plan (AEDP) aims to reduce electric power generation from fossil fuels by generating electricity from wind. In this study, the purpsoe is to determine a good place for a wind farm installation. The wind potential of the Gulf of Thailand (GoT) was monitored every 10 minutes for four years (2017-2020) at 10 m agl of 10 meteorological masts and analyzed using the Wind Atlas Analysis and Application program (WAsP). Stations with average wind speeds greater than 3 m/s were provided to Multi Criteria Decision Analysis (MCDA) in order to find a viable offshore wind farm in GoT. Furthermore, the Annual Energy Product (AEP) was calculated and analyzed using 28 Vestas V112-3.0 MW Offshore in this study. The results revealed that Prachuap Khiri Khan and Narathiwat are two MCDA-selected stations. Prachuap Khiri Khan had a mean wind speed of 4.1 m/s and a power density of 121 W/m2, while Narathiwat had a mean wind speed of 4.5 m/s and a power density of 181 W/m2. Prachuap Khiri Khan's total net AEP was 226.7 GWh/year, with a capacity factor of 33.1%. Narathiwat's total net AEP was 270.8 GWh/year, with a capacity factor of 37%. In terms of economics, Narathiwat has a lower cost per unit than Prachuap Khiri Khan, at $0.14/kWh and $0.17 kWh, respectively. A suitable wind farm in the Gulf of Thailand allows wind energy to be used to generate electricity, which benefits the investor or people interested in offshore windfarm. © 2021. All Rights Reserved.

关键词： Fossil fuels

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The Design of a Drone-Assisted System for Large Wildlife Vaccination Shooting Based on AI Image Identification technology

The Design of a Drone-Assisted System for Large Wildlife Vac...

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IEEE International Conference on e-Business engineering (ICEBE)

作者： Yao-Yu Tsai Yao-Chuan Tsai Chang-Hsien Tai Chen-Chih Chen Uzu-Kuei Hsu Department of Bio-Industrial Mechatronics Engineering Sustainable Circular Economy R&D Center National Chung Hsing University/National Pingtung University of Science and Technology Pingtung/Taichung Taiwan Department of Bio-Industrial Mechatronics Engineering National Chung Hsing University Taichung Taiwan College of Biomedical Engineering and Technology Tzu Chi University Hualien Taiwan Institute of Wildlife Conservation National Pingtung University of Science and Technology Pingtung Taiwan Program of Artificial Intelligence and Mechatronics National Pingtung University of Science and Technology Pingtung Taiwan

ISBN: (数字)9798350365856

ISBN: (纸本)9798350365863

This study designs a UAV -assisted system integrated with AI image recognition technology to alleviate the difficulty for operators in stabilizing the UAV and accurately administering vaccines. The system uses thermal imaging modules and AI recognition systems to lock onto and track target animals in real-time. Utilizing MAVLink, the UAV adjusts its flight path based on the dynamic behavior of the animals, ensuring that the target remains within shooting range for precise vaccine administration. This technology not only improves the efficiency and accuracy of wildlife vaccination but also significantly reduces the workload on operators, providing a forward-looking solution for wildlife management.

关键词： Accuracy Image recognition Target tracking Target recognition Wildlife Autonomous aerial vehicles Real-time systems Vaccines Artificial intelligence Monitoring

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