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Integration of the PEMFC with a hydrogen production device adopting sodium borohydride and metal cobalt catalyst

International Journal of Hydrogen Energy 2024年第PartB期52卷 905-916页

作者： Chang, Pai-Chun Lai, Jyun-Lin Huang, Ching-His Kuan, Yean-der Department of Refrigeration and Air Conditioning and Energy Engineering National Chin-Yi University of Technology 411 Taichung Taiwan Ph.D. Program Intelligent Machinery and Smart Manufacturing National Chin-Yi University of Technology 411 Taichung Taiwan

Hydrolysis technology that releases hydrogen from chemical hydrogen storage materials is a method to produce hydrogen. Hydrogen storage has excellent development potential and is also one of the sources of large amounts of hydrogen. A sodium borohydride hydrogen production experiment was carried out based on steam hydrolysis technology. The system reaction tank is divided into a water-carrying bed and a catalyst bed. A mixed aqueous solution with a concentration of 1 wt% sodium hydroxide (NaOH) + 10 wt% sodium borohydride (NaBH4) was used for the hydrogen production reaction test. These experiments determined the appropriate aqueous solution and water vapor combination, and optimal parameters for hydrogen production. The hydrogen production catalyst powder, blend ratio, different steel ball ratios, and ball milling time at the steam hydrogen production end will all affect the powder's fineness and hydrogen production stability. Under catalyst temperature control, the by-products solidify at a specific temperature, which affects the gas passage and causes blockage. Increasing the hydrogen production in an aqueous solution requires a Co2+/Al2O3 catalyst, or a temperature control method to catalyze hydrogen production to obtain stable hydrogen production suitable for emergencies without hydrogen storage containers. This experiment built a hydrogen production system combined with a fuel cell for power generation testing. The test process and results indicate whether the aqueous solution and steam technology can be an effective solution when the hydrolysis hydrogen production technology is matched. © 2023 Hydrogen Energy Publications LLC

关键词： Hydrogen production

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A comprehensive study on minimum quantity lubrication

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Materials Today: Proceedings 2022年 56卷 3078-3085页

作者： Kumar, Santosh Kumar, Rakesh Singh, Swarn Singh, Harvinder Kumar, Amresh Goyal, Rachin Singh, Sham Department of Mechanical Engineering Chandigarh Group of Colleges Landran Punjab Mohali India Ph.D. Research Scholar Department of Mechanical Engineering Chandigarh University Gharuan Mohali Punjab India Department of Applied Science Chandigarh Engineering College Landran Mohali India

The cutting fluid plays a significant role by cooling the surface of tool, substrate and removing chips from the cutting area during metal machining operations (turning, milling, grinding etc.). However, by adopting the conventional method of cooling (flood cooling), it affects the human health and the environment badly. In addition, it accounts for 16–20% of the total cost of manufacturing in the production industry. To overcome this issue, minimum quantity lubrication (MQL) is gaining higher potential for attaining good quality surface and improved overall performance of machining than conventional cooling methods. Because MQL system reduce the use of coolant by depositing the suitable mixture of cutting fluid and compressed air during machining in optimum quantity. In general the amount of cutting fluid in MQL system is in ml/hr instead of in l/min as in flood cooling. Beside these benefits of MQL system, it also decreases the cutting forces, tool wear, temperature and friction during machining. Hence the aim of this paper is to provide an overview of MQL system, cutting fluids and effect of MQL on the machining performance during turning operation. The study revealed that by employing MQL system in turning results in significant enhancement in metal removal rate and surface finish by 30% and reduced cutting force (by 17.07–40%), cutting temperature (by 6.72–10%), tool wear and eliminated built up edge. Overall this improved the overall performance of the machining. © 2021

关键词： Cutting fluids

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Micro-Cantilever Array With Electroplating Tin Bumps for Flip-Chip Bonding Technology

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IEEE Transactions on Components, Packaging and Manufacturing Technology 2023年第12期13卷 2040-2045页

作者： Hu, Zihsong Liou, Chengshiun Tsou, Chingfu Feng Chia University Department of Automatic Control Engineering Taichung40724 Taiwan Institute of Nano Engineering and Microsystems National Tsing Hua University Hsinchu30013 Taiwan Feng Chia University Doctorate Degree of the Ph.D. Program of Electrical and Communications Engineering Taichung40724 Taiwan

A Nickel (Ni) microcantilever beam array with tin (Sn) solder bumps has been designed for flip-chip bonding with high-density electrodes. Micro-electro-mechanical system (MEMS) technology and the micro-electroplating process were used in the fabrication process. Utilizing the out-of-plane deformation of the suspended microcantilever beam, the satisfied heights partially compensate the substrate curvature to ensure a high flip-chip bonding yield, thus, improving package quality in terms of electrical connections. To demonstrate this technique, this study developed a flip-chip carrier for a typical micro-LEd array with a beam length of 70~ μm and a bump height of 2~ μm. The measurement results revealed that the displacement of the microcantilever beam was approximately 0.8~ μm when a 500~ μN force was applied on top of the tin bump. When a glass substrate directly mounts to the flip-chip carrier through the tin bump at a heat reflow of 270 °C, most of the tin bumps successfully melt and solidify, which results in good bonding performance. These results revealed that the proposed approach could be applied to the wafer-level packaging process with high-density ball grid array electrodes. © 2011-2012 IEEE.

关键词： Flip chip devices

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PEMF device with Bipolar Pulse Waves Based on Single Chip Computer 8

PEMF Device with Bipolar Pulse Waves Based on Single Chip Co...

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2022 8th International Conference on Mechanical engineering, Materials and Automation Technology, MMEAT 2022

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

PEMF therapy, a non-invasive technology, is frequently reported in medical journals. It can send electric and magnetic fields to the body through induction coils [1,2], so as to provoke cells to stimulate nerves and muscles. Based on performances of large PEMF equipment on the market, on average, the low frequency emitted by most PEMF equipment is 0-300HZ An appropriate single chip is selected to make an extremely low frequency 0-30HZ that can be easily developed and easily changed. And has bipolar pulse wave so that simple equipment can also get enough effect. © Published under licence by IOP Publishing Ltd.

关键词： Condensed matter physics

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design and fabrication of composite current collector used in 2-cell stacks for portable power generator

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International Journal of Hydrogen Energy 2024年 54卷 294-304页

作者： Wang, Chong-Kai Kuan, Yean-der Ph.D. Program Intelligent Machinery and Smart Manufacturing National Chin-Yi University of Technology Taichung411 Taiwan Department of Refrigeration and Air Conditioning and Energy Engineering National Chin-Yi University of Technology Taichung411 Taiwan

This study designed a planar carbon fiber composite collector plate with excellent conductivity and mechanical strength for use in the proton exchange membrane fuel cell (PEMFC). The collector plate is made of phenolic resin mixed with conductive particles such as graphite powder, and coated onto carbon fiber cloth. After the solvent is allowed to evaporate, the prepreg is cut and stacked layer by layer into a mold for the heat pressing process at 150 °C. The resin in the carbon fiber prepreg cloth is cured into a carbon fiber composite board. A computer numerical control (CNC) engraving machine was used to engrave the carbon fiber composite board into the current collector shape. The carbon fiber composite current collectors were placed into a high temperature furnace for the carbonization process. The resin between the carbon fibers is removed by the high temperature to increase conductivity. The carbon fiber composite collectors were assessed for conductivity, mechanical strength, and performance. Afterwards, a planar two cell fuel cell stack was assembled for testing performance and stability. A printed circuit board (PCB) was used to design the circuit and the planar two cell fuel cell module made using the heat pressing process. The planar two cell module was combined with a small hydrogen storage tank to form a portable power generation device. © 2023 Hydrogen Energy Publications LLC

关键词： Carbon fibers

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Chaos and detection

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physical Review E 1996年第5期53卷 4514-4514页

作者： Andrew M. Fraser Systems Science Ph.D. Program Portland State University Portland Oregon 97207-0751

I report on numerical experiments in which a detector reliably found chaotic signals at signal to noise ratios as low as - 15 dB. The detector was based on a variant of the hidden Markov models used in speech research. The task was particularly difficult because the Fourier power spectrum of the noise was constructed to match the spectrum of the signal. I review likelihood ratio detectors, limitations on the performance of linear models implied by the broad Fourier power spectra of chaotic signals, and the upper limit that the Kolmogorov-Sinai (KS) entropy of a chaotic system places on the expected log likelihood attainable by any model. I find that KS entropy estimates indicate that even better detection performance is possible.

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An Improvement of A Lightweight NFC Authentication Algorithm Based on Modified Hash Function 14

An Improvement of A Lightweight NFC Authentication Algorithm...

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14th International Conference on Information and Communication Technology Convergence, ICTC 2023

作者： Hwang, Min-Shiang Li, Hou-Wen Yang, Cheng-Ying Asia University Department of Computer Science and Information Engineering Taichung354 Taiwan Asia University The Ph.D. Program in Artificial Intelligence Taichung354 Taiwan University of Taipei Department of Computer Science Taipei Taiwan

ISBN: (纸本)9798350313277

In NFC applications, user privacy information must be protected first. Cao and Liu recently proposed a lightweight NFC authentication scheme based on an improved hash function to ensure that the user's private information will not be leaked. Although their method is highly efficient and has Mutual Authentication, Forward Security, Backward Security, and security against attacks such as Replay, Location, and Fake, once out of synchronization occurs, the method must reestablish synchronization data. Therefore, this article will propose a lightweight synchronization method. © 2023 IEEE.

关键词： authentication algorithm hash function near field communication privacy

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A Fitness Movement Evaluation System Using deep Learning 15

A Fitness Movement Evaluation System Using Deep Learning

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15th International Conference on Knowledge and Systems engineering, KSE 2023

作者： Chang, Chin-Chih Wei, Chi-Hung Wu, Hao-Wei Hsiao, Sean Chung Hua University Department of Computer Science and Information Engineering Hsinchu City Taiwan Ph.D. Program in Engineering Science Chung Hua University Hsinchu City Taiwan Bachelor Program in Applied Foreign Language and Smart Commerce Chung Hua University Hsinchu City Taiwan

ISBN: (纸本)9798350329742

This paper proposes a fitness movement evaluation system using deep learning. The system uses a deep convolutional neural network (CNN) to extract features from pictures of fitness movements. The features are then used to classify the movements into different categories. The system is evaluated on a dataset of pictures of fitness movements. The results show that the system can accurately classify the movements into different categories. The system is designed to provide feedback to users on their fitness movements. The proposed system is a valuable tool for fitness enthusiasts. The main contribution of this paper is to propose a way to give users a score for their fitness movement. It can help users improve their fitness and track their progress over time. The system is also a valuable tool for fitness professionals. It can help professionals develop new fitness programs and provide feedback to their clients. © 2023 IEEE.

关键词： Convolutional neural networks

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Mitigation Strategies of Land Use for Zengwen Reservoir and Its Catchment: Post-disaster of Typhoon Morakot

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World Journal of engineering and Technology 2014年第3期2卷 71-77页

作者： Miao-Yun Chen I-Chang Chow Feng Chia University Ph.D. Program in Civil and Hydraulic Engineering Taichung Taiwan

Mitigation and adaptation have become two main strategies that governments around the world are focusing on in response to the threat of global climate change. In August 2009, Typhoon Morakot heavily damaged the central and southern parts of Taiwan, causing irreversible damage to the environment, especially in the mountain areas. In this study, the goal is to attain sustainable reservoir management, thus comprehensive storm water management is used to develop mitigation strategies. Overlay-map methods of GIS, along with vulnerability analysis and land use sustainability analysis, are used to map out optimal land use patterns containing development potentials, growth limits, and suitability concerns that aim to reduce the impact of human development on the ecological environment. Finally, the mitigation strategies proposed by this study for the land use of Zengwen Reservoir and its catchment will be implement shortly.

关键词： Global Climate Change Environment Vulnerability Sensitive Area Suitability Analysis Mitigation Adaptation Map Overlay Comprehensive Storm Water Management Catchment

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An Application-Aware Clustering Strategy in Vehicular Ad Hoc Network 6

An Application-Aware Clustering Strategy in Vehicular Ad Hoc...

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6th International Conference on Computing, Electronics and Communications engineering, iCCECE 2023

作者： Wei, Chi-Hung Chang, Chin-Chih Chu, Chien-Hao Hsiao, Sean Chung Hua University Ph.D. Program in Engineering Science Hsinchu City Taiwan Chung Hua University Department of Computer Science and Information Engineering Hsinchu City Taiwan Chung Hua University Bachelor Program in Applied Foreign Language and Smart Commerce Hsinchu City Taiwan

ISBN: (纸本)9798350340921

VANET (Vehicular Ad Hoc Network) was developed to address the unique challenges of communication in a mobile vehicular environment. This technology can enhance driving safety and traffic control. Moreover, similar principles can be applied to unmanned aerial vehicles and robotics. When transmitting data in moving vehicles, it is challenging as access points and base stations keep changing, requiring handovers between different access points and base stations. Clustering is a popular approach used to address this challenge. Common clustering strategies are based on the proximity, communication range, the density, the application requirements of the moving vehicles, or hybrid of them. In this paper, we propose a clustering strategy based on the application sublayer in the vehicle communication protocol. If two computing devices on the move run the same application, they can be grouped together. The contribution of this research is to develop a clustering mechanism based on the application with very low overhead. We also validate the proposed method through simulations. The simulation results indicate that the proposed method is feasible. © 2023 IEEE.

关键词： Vehicular ad hoc networks

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