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Microwave dielectric and structural characteristics in Li2O-B2O3-SiO2 glass ceramics

Ceramics International 2025年

作者： Qiu, Jun-Yan Tu, Chi-Shun Huang, Szu-Ting Li, Yongxiang Chen, Pin-Yi Chen, Cheng-Sao Montecillo, Rhys Feng, Kuei-Chih International Ph.D. Program in Innovative Technology of Biomedical Engineering and Medical Devices Ming Chi University of Technology New Taipei City Taiwan Department of Physics Fu Jen Catholic University New Taipei City Taiwan Department of Mechanical Engineering Ming Chi University of Technology New Taipei City Taiwan School of Engineering RMIT University MelbourneVIC3000 Australia Research Center for Intelligent Medical Devices Ming Chi University of Technology New Taipei City Taiwan Department of Mechanical Engineering Hwa Hsia University of Technology New Taipei City Taiwan

Advancements in high-frequency communication devices have emphasized miniaturization and low energy consumption. This work focuses on developing microwave dielectric materials characterized by an ultra-low dielectric constant and low dielectric loss coefficient. In this study, B2O3 and Li2O were added into the SiO2 matrix to form the LBS glass-ceramics. The B2O3-added SiO2 shows a formation of α-cristobalite phase, and the Li2O additive in the B2O3-SiO2 glass-ceramics sintered at 900 °C reveal a primary quartz phase with a secondary phase Li2Si2O5, that partially transformed into Li2SiO3 in the specimen sintered at 950 °C. The LBS12 (x = 12 wt%) show stronger Raman peaks of Li2Si2O5 and Li2SiO3, indicating increase of highly-crystallized Si-O network. As the quartz phase diminishes, Li2Si2O5 and Li2SiO3 begin to develop in the glass-ceramic matrix. dense microstructures and well-formed crystalline grains were observed in the LBS glass-ceramics. The quality factors were primarily affected by grain size and density. The Li2Si2O5 additive in the LBS glass-ceramics can reduce dielectric permittivity (Εr) and increase Q × f, particularly at higher frequencies. A low Εr of 4.7–5, a high Q × f of 2600 GHz, and a hardness of 249 MHV were achieved in the LBS12 sintered at 900 °C. These LBS glass-ceramics exhibit potential for use in low-temperature co-fired ceramic (LTCC) applications in high-frequency communication devices. © 2025

关键词： Sintering

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System identification and control of a small unmanned helicopter at hover mode 2

System identification and control of a small unmanned helico...

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2nd International Conference on Control and Robotics engineering, ICCRE 2017

作者： Lai, Ying-Chih Le Tri, Quang Ph.D. Program of Mechanical and Aeronautical Engineering Feng Chia University Taichung Taiwan

ISBN: (纸本)9781509037735

Acquiring the dynamic model of a helicopter is one of the most important requirement before the design of an autonomous model-based flight control. The objective of the study is to identify the pitch, roll, heave, and yaw dynamic models of the used virtual helicopter, Raptor, in X-Plane flight simulator. A software-in-the-loop (SIL) was then developed by using all estimated models. In this study, the subspace method and prediction error method (PEM) were investigated to identify the dynamic models. The model predictive control (MPC) was adopted to perform the autonomous control in SIL. The results demonstrated that the proposed approach is viable for the autonomous flight control for the small helicopter. © 2017 IEEE.

关键词： Model predictive control

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Optical sensor for dissolved ammonia by embedding eosin Y in cellulose acetate and silicone rubber via the phase inversion method

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Microchemical Journal 2025年 213卷

作者： Putro, dimas Trio Sari, desy Purnama Chu, Cheng-Shane International Ph.D. Program in Innovative Technology of Biomedical Engineering and Medical Devices Ming Chi University of Technology Taishan Dist. New Taipei City 24301 Taiwan Department of Mechanical Engineering Ming Chi University of Technology Taishan Dist. New Taipei City 24301 Taiwan Research Center for Intelligent Medical Devices Ming Chi University of Technology Taishan Dist. New Taipei City 24301 Taiwan

This study presents the phase inversion method for fabricating a new optical sensing membrane designed for dissolved ammonia detection. Eosin Y was embedded into composite materials of cellulose acetate (CA) and silicone rubber to enhance optical performance and modify the membrane structure. Sensing performance was evaluated using luminescence quenching, which involved measuring changes in both intensity and wavelength. The fabricated membrane exhibited a microporous structure with pore diameters ranging from 1 to 10 µm, a quenching response (I₀/I₄₀₀) of 15.15, a response time (↓t₉₀) of 53 s, and effective detection at a concentration of 400 mM, a room temperature (20–25 °C), and ph 6.02, with sensing response slightly decreasing at elevated temperatures (up to 50 °C) and at ph 3.17 and 9.29. The nonlinear quenching response plot was converted into a linear form using the decibel (dB) formula, significantly improving linearity (R² = 0.9862). The membrane also exhibited excellent selectivity and the ability to detect in both gas and dissolved phases. Additionally, the sensing mechanism was investigated, revealing a combination of static and dynamic quenching, which led to an intensity decrease and a bathochromic shift of 16.56 nm. These findings highlight the potential of the developed optical sensor for rapid and highly selective ammonia monitoring in various environments. © 2025 Elsevier B.V.

关键词： Bathochromic shift dissolved ammonia detection Eosin Y Optical sensing membrane phase inversion method

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Fluid Mechanics in Counter and Upward Water Flow Improving Swimming Learning Effectiveness for physical and Mental disorders 2

Fluid Mechanics in Counter and Upward Water Flow Improving S...

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2nd IEEE Eurasia Conference on IOT, Communication and engineering, ECICE 2020

作者： Chu, Hung-Yi Gau, Li-Shiue Liu, Min-Shan Tai, Kuo-Cheng Tsai, Wen-Chin Feng Chia University Program of Mechanical and Aeronautical Engineering Taichung Taiwan Asia University Taichung Taiwan Feng Chia University Ph.D. Program of Mechanical and Aeronautical Engineering Taichung Taiwan

ISBN: (纸本)9781728180601

This study designed and examined counter-current water flow with manual and automatic control in a swimming pool, which improves the learning effectiveness for people with physical and mental disorders. 29 elementary school students with autism and three students with down syndrome participated in the experiment. Their functional fitness, self-care ability, and motor skills were improved after swimming. The device of counter and upward current provided a safer, more interesting, and effective learning environment than a traditional pool. © 2020 IEEE.

关键词： Automation

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Software and hardware environments for simulation and verification of an autonomous flight control based on fuzzy logic control for small unmanned helicopter 3

Software and hardware environments for simulation and verifi...

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3rd International Conference on Control, Automation and Robotics, ICCAR 2017

作者： Lai, Ying-Chih Ke, Yu-Chen Tri, Quang Le Yang, Fuh-Sen Shieh, Tzong-Hann Ph.D. Program of Mechanical and Aeronautical Eng. Feng Chia University Taichung Taiwan

ISBN: (纸本)9781509060870

Unmanned helicopter is an air vehicle with high dynamic motions. The development of the autonomous flight control for unmanned helicopters is limited by the inherent instability and the nonlinearity of its dynamic model. The objective of this paper is to build a development environment for the autonomous flight control of unmanned helicopters. At the beginning of the study, a software-in-the-loop (SIL) simulation system was implemented. Then, fuzzy logic control (FLC) was adopted and employed to demonstrate the autonomous flight of a target radio-controlled (RC) helicopter in a flight simulator, X-plane. Finally, a Hardware-in-the-loop (HIL) simulation system was built to verify the performance of the developed autonomous flight control system for two flight modes, altitude hold and position fixed modes. The results of the simulations reveal that the developed simulation environment is viable for the development of the autonomous flight control system for unmanned helicopters. © 2017 IEEE.

关键词： Helicopters

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doping ratio between ZnO/MgO tunes antimicrobial, osteogenic, and anti-osteoclast activity of CaO-MgO-ZnO-SiO2 bioactive glass-ceramics

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Ceramics International 2025年

作者： Hung, Guan-Yi Xia, Yun-Ze Chen, Pin-Yi Lai, Po-Liang Feng, Kuei-Chih Tu, Chi-Shun Cheng, I.-C. Wang, Chi-Yun International Ph.D. Program in Innovative Technology of Biomedical Engineering and Medical Devices Ming Chi University of Technology New Taipei City24301 Taiwan Department of Physics Fu Jen Catholic University New Taipei City24205 Taiwan Department of Mechanical Engineering Ming-Chi University of Technology New Taipei City24301 Taiwan Bone and Joint Research Center Department of Orthopaedic Surgery Chang Gung Memorial Hospital Taoyuan City33305 Taiwan College of Medicine Chang Gung University Taoyuan City33305 Taiwan Department of Mechanical Engineering Chang Gung University Taoyuan City33305 Taiwan Research Center for Intelligent Medical Devices Ming Chi University of Technology New Taipei City243303 Taiwan

Limitations such as donor site morbidity hamper autologous bone grafts. On the other hand, allogeneic grafts, sourced from cadavers, pose risks of viral transmission and rejection. While hydroxyapatite is a prevalent synthetic graft material, antibiotic-laden fillers addressing infection face challenges with antibiotic-resistant pathogens, driving the emergence of nonantibiotic materials to combat persistent bone infections. Bioactive glass is a potential bone void filler superior to hydroxyapatite. Thus, to improve the antibacterial efficacy and bioactivity, we adjusted the doping ratio of the novel CaO-(1-x) MgO-(x) ZnO-SiO2 glass-ceramics (x = 0, 0.25, 0.50, 0.75, 1). Using XRd, we found a typical amorphous structure alongside polycrystalline diopside (CaMgSi2O6), hardystonite (Ca2ZnSi2O7), and petedunnite (CaZnSi2O6) formations. Raman spectroscopy revealed the silicate-glass matrix structure in all the Zn(100x) glass-ceramics and confirmed that the Zn ions replaced the Mg ions. Zn-doped glass-ceramics promoted apatite layer formation and had greater antibacterial efficacy against E. coli and S. aureus. Zn25 glass-ceramic were biocompatible with L929 and MC3T3-E1 cells. Furthermore, Zn25 glass-ceramic promoted bone cell mineralization and reduced osteoclast formation without affecting ALP activity. In vivo, the Zn25 glass-ceramic exhibited greater osteointegration ability than the HAP and Zn0 glass-ceramic. Taken together, the present study demonstrated that bioactive glass-ceramics with a doping ratio between ZnO and MgO (25:75) can enhance antibacterial and osteogenic activity while impeding osteoclastogenic activity. © 2025

关键词： Escherichia coli

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Achieving high surface bioactivity and adhesion in Ti-6Al-4V alloy via anodic oxidation and electrophoretic deposition

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Ceramics International 2025年

作者： Wu, Yu-Jie Wang, Chi-Yun Mana-ay, Haidee Tu, Chi-Shun Lai, Po-Liang Chen, Pin-Yi International Ph.D. Program in Innovative Technology of Biomedical Engineering and Medical Devices Ming Chi University of Technology New Taipei City24301 Taiwan Research Center for Intelligent Medical Devices Ming Chi University of Technology New Taipei City24301 Taiwan Department of Physics Fu Jen Catholic University New Taipei City24205 Taiwan Bone and Joint Research Center Department of Orthopedic Surgery Chang Gung Memorial Hospital Taoyuan City33305 Taiwan Department of Mechanical Engineering Chang Gung University Taoyuan City33302 Taiwan Department of Physics Silliman University Dumaguete City6200 Philippines

This study combines 3d printing, anodic oxidation (AO), and electrophoretic deposition (Ed) technologies to develop Ti-6Al-4V alloy (abbreviated as Ti64) with high hydrophilicity, adhesion, and bioactivity. Titanium oxide nanotubes formed by AO treatment on the Ti64 surface exhibited reduced contact angles from 53 ° to 10 °. The adhesion of the calcium (Ca) layer through the integrated technology of the AO and Ed treatments (herein abbreviated as AEd) displays an optimal adhesive force of over 30 N on the Ti64 surface, which is attributed to the stable chemical bond due to the formation of OH− ions on the substrate after the AO treatment and the subsequent oxidation reaction of the Ca2+ ions to form a predominantly Ca(OH)2 layer after the Ed treatment. Moreover, the AEd treatment forms tiny needle-like structures that can effectively promote osteogenic differentiation. The expressions of the osteocyte marker genes (i.e., OCN, OPN, and dMP1) were improved after the AEd treatment, showing increased osteogenic differentiation into mature bone tissue. This work presents the AEd treatment as a valuable surface modification technique to boost the surface bioactivity of Ti64 for clinical orthopedic applications. © 2025

关键词： Anodic oxidation

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Numerical and Experimental Study on Flow Effects of Pneumatic Proportional Pressure Valve

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Journal of the Chinese Society of mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao 2020年第2期41卷 149-158页

作者： Shieh, Tzong-Hann Yeh, Chun-Liang Chen, Yu-Li Hsiao, Charng-Chin Department of Aerospace and Systems Engineering Feng Chia University 100 Wenhwa Rd. Seatwen Taichung Taiwan Ph.D. Program of Mechanical and Aeronautical Engineering Feng Chia University 100 Wenhwa Rd. Seatwen Taichung Taiwan

This study developed a novel system for the measurement of pressure within an SMC-ITV2030-012BL pneumatic proportional pressure valves. We also constructed a precise three-dimensional structure of the channel within the valve to examine the aerodynamic characteristics of the internal flow field using the finite volume method and Reynolds-averaged Navier-Stokes equations. We first compared the aerodynamic characteristics resulting from opening the valve 70% using completely or partially encrypted grid models. We then considered various wall structures at the inlet and outlet of the flow channel with the same valve opening. Finally, we compared the results of simulation and experiments of the flow field within the valve. Finally, we investigated the flow field characteristics when the valve was opened 90%, 70%, and 50%. Experiment and simulation results show that the aerodynamic characteristics of the flow field are influenced by the wall structures of the valve and the opening of the valve as well as the grid encryption method that is employed. © 2020, Chinese mechanical engineering Society. All right reserved.

关键词： Finite volume method

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design Method for Wafer dicing Machine Base Based on Calculations 9

Design Method for Wafer Dicing Machine Base Based on Calcula...

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9th International Conference on mechanical engineering, Materials, and Automation Technology, MMEAT 2023

作者： Tai, Au-Zou Fang, Jiunn Ph.D. Program of Mechanical and Aeronautical Engineering Feng Chia University Taichung40724 Taiwan Department of Aerospace and Engineering Feng Chia University Taichung City Taiwan

ISBN: (纸本)9781510668584

In recent years, the role of semiconductor industry has become crucial for development in various countries. The semiconductor industry mainly consists of three parts: silicon material production, integrated circuit wafer manufacturing, and integrated circuit packaging. This paper focuses on the analysis of the cutting structure of the backend equipment wafer dicing machine in the integrated circuit packaging process. Currently, the mainstream wafer dicing machines utilize two types of cutting methods: laser cutting and mechanical cutting. While laser cutting is necessary for certain materials due to the generation of debris, mechanical cutting using diamond saw blades still offers significant cost savings. In order to achieve optimal design for mechanical wafer dicing machines, this paper presents a design process specifically tailored for such machines that used of mechanical cutting method, taking the example of a vibration-isolated base for a 6-inch wafer dicing machine. © 2023 SPIE.

关键词： Integrated circuit design

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THE INFLUENCE OF STATIC STRESS ON THE CORROSION BEHAVIOR OF 316L-STAINLESS STEEL IN RINGERS SOLUTION

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JOURNAL OF BIOMEdICAL MATERIALS RESEARCH 1986年第4期20卷 493-505页

作者： BUNdY, KJ VOGELBAUM, MA dESAI, VH Biomedical Engineering Department Tulane University New Orleans Louisiana 70118 Formerly undergraduate student Johns Hopkins University now with M.D.-Ph.D. program University of Virginia. Formerly Ph.D. candidate Johns Hopkins University now Assistant Professor Mechanical Engineering and Aerospace Sciences Department University of Central Florida.

The decrease in corrosion resistance of 316L stainless steel due to static stress was studied in vitro using a ***. C Ringer''s solution electrolyte. Both potentiodynamic polarization and coulometric techniques were used. Cyclic anodic polarization tests with highly loaded fracture mechanics samples revealed a lowering of breakdown potential and disruption of passive films compared to unstressed controls. Measurements of the time-averaged current density due to a 100 mV anodic overpotential showed that a stress level causing plastic deformation increases the current density by more than an order of magnitude compared to samples stressed to the yield stress or nonloaded controls. The significance of these findings for surgical implant devices in service is discussed.

关键词： STAINLESS STEEL

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