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A low-cost in-situ CO_(2) sensor based on a membrane and NdIr for long-term measurement in seawater

Journal of Oceanology and Limnology 2022年第3期40卷 986-998页

作者： Meng LI Baolu dU Jinjia GUO Zhihao ZHANG Zeyu LU rong’er ZHENG College of Information Science and Engineering Ocean University of ChinaQingdao 266100China R&D Center for Marine Instruments and Apparatuses Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China

The multi-point simultaneous long-term measurement of CO_(2) concentration in seawater can provide more-valuable data for further understanding of the spatial and temporal distribution of CO_(2).Thus,the requirement for a low-cost sensor with high precision,low power consumption,and a small size is becoming *** this work,an in-situ sensor for CO_(2) detection in seawater,based on a permeable membrane and non-dispersive infrared(NdIr)technology,is *** sensor has a small size(Ф66 mm×124 mm),light weight(0.7 kg in air),low power consumption(<0.9 W),low cost(d high-pressure tolerance(<200 m).After laboratory performance tests,the sensor was found to have a measurement range of(0–2000)×10^(-6),and the gas linear correlation r^(2) is 0.99,with a precision of about 0.98%at a sampling rate of 1 s.A comparison measurement was carried out with a commercial sensor in a pool for 7 days,and the results showed a consistent ***,the newly developed sensor was deployed in Qingdao nearshore water for 35 *** results proved that the sensor could measure the dynamic changes of CO_(2) concentration in seawater continuously,and had the potential to carry out long-term observations on an oceanic *** is hoped that the sensor could be applied to field ocean observations in near future.

关键词： in-situ sensor dissolved CO_(2) long-term measurement permeable membrane non-dispersive infrared(NdIr) low-cost

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Modification of gelatin and photocured 3d-printed resin to prepare biomimetic phantoms for ultrasound-guided minimally invasive surgeries

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Polymer engineering and Science 2023年第2期63卷 413-425页

作者： Chen, Chien-Hua Huang, Yi-Fan Chen, Po-Hao Hsu, Yu-Tung Jaw, Fu-Shan Ho, Ming-Hua Department of Biomedical Engineering National Taiwan University Taipei City Taiwan Department of Chemical Engineering National Taiwan University of Science and Technology Taipei City Taiwan R&D Center for Membrane Technology National Taiwan University of Science and Technology Taipei Taiwan

The main challenge of ultrasound-guided minimally invasive surgeries is to carry out treatments through small boreholes in the patient's body surface with sub-millimetric accuracy and facility offered by ultrasound instruments. Thus, the phantoms' biomimetic appearances, acoustic characteristics, and mechanical properties are essential for healthcare professionals. In this study, gelatin and 3d-printed photo-resin phantoms were developed for hard and soft tissues, respectively. Using glutaraldehyde (GA) and formaldehyde (FA) to crosslink gelatin phantoms, the mechanical strength, ultrasound velocity, acoustic impedance, needle insertion forces, and antiseptic periods were improved, and the addition of silica nanoparticles raised the acoustic impedance. For 3d-printed phantoms, the acoustic impedance ascended with hydrophilic polyethylene glycol diacrylate (PEGdA) oligomers. The additives applied in this study successfully made the gelatin and photo-resin phantoms more mimetic to muscle and bone tissues, allowing their application in preoperative preparations. © 2023 The Authors. Polymer engineering & Science published by Wiley Periodicals LLC on behalf of Society of Plastics Engineers.

关键词： 3d printers

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High-Performance Nitrogen Selectivity through Selective Nitrate reduction on Nickel-Supported Copper Foam Architectures

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Process Safety and Environmental Protection 2025年

作者： Thi Nhat-Tuyen Nguyen Kiruthika Mariappan Jih-Hsing Chang Tsin-Hai Wang Subramanian Sakthinathan Chao-Lin Liu Ching-Lung Chen International Ph.D. Program in Innovative Technology of Biomedical Engineering and Medical Devices Ming Chi University of Technology New Taipei City 243303 Taiwan Department of Safety Health and Environmental Engineering Ming Chi University of Technology New Taipei City 243303 Taiwan Department of Environmental Engineering and Management Chaoyang University of Technology Taichung 413310 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Zhongli 32003 Taiwan Department of Materials and Mineral Resources Engineering National Taipei University of Technology No.1 Section 3 Chung-Hsiao East Road Taipei 106 Taiwan Department of Chemical Engineering Ming Chi University of Technology New Taipei City 243303 Taiwan R&D Center of Biochemical Engineering Technology Ming Chi University of Technology New Taipei City 243303 Taiwan Center for Environmental Sustainability and Human Health Ming Chi University of Technology New Taipei City 243303 Taiwan Center for Sustainability and Energy Technologies Chang Gung University Taoyuan 33302 Taiwan

In this study, Nickel@Copper (Ni@Cu) bimetallic electrodes were fabricated via electrodeposition to assess their efficacy in electrochemical nitrate reduction (ENr). The Ni@Cu 3m electrodes achieved a remarkable nitrate (NO 3 − ) reduction efficiency of 96.09% and nitrogen selectivity of 96.08% at a current density of 1.36 mA/cm² over an 8-hour reaction period. Extensive characterization techniques, including TEM, XPS, and Xrd, were employed to analyze the structural and morphological features of the electrodes. Cyclic voltammetry was used to examine electron transfer interactions between surface nitrogen (N 2 ) species and copper foam electrodes, nitrate (NO 3 − ) reduction commenced within a potential range of −0.8 V to 0.1 V. The Ni loading on copper foam was optimized to enhance catalytic performance, and the effect of different pH levels on activity was systematically studied. The Ni@Cu 3m electrodes demonstrated excellent long-term stability over 10 cycles, maintaining high efficiency and selectivity over multiple cycles. These results highlight the strong potential of bimetallic electrodes as efficient and reliable candidates for NO 3 − reduction in wastewater treatment applications.

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A Novel Pulse Excitation Circuit Model and Analysis of Its Magnetic Induction Advantages 4

A Novel Pulse Excitation Circuit Model and Analysis of Its M...

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2023 4th International Conference on Mechanical Instrumentation and Automation, ICMIA 2023

作者： Li, Zhi Chao Zhang, Chun Guang Liu, Jia rui Chu, Shuai Gong, Ying Jiao Geng, Wei R&D Center National Engineering Research Center of Transducer Beihai Street 242 Shenyang China R&D Center SINOMACH Sensing Technology Co. Ltd. Beihai Street 242 Shenyang China

In this paper, we discuss the excitation module in the magnetic induction system. First, we start from the traditional sinusoidal input resonant excitation circuit and give the frequency domain equation of its excitation current. Then, we propose a new module based on pulse excitation and give the corresponding excitation equation in the frequency domain. After that, we deduce the mathematical model of excitation gain of new and old modules using application and technology and finally obtain intuitive mathematical analysis graphics for engineering promotion. © Published under licence by IOP Publishing Ltd.

关键词： Timing circuits

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A Calculation method for indicated mean effective pressure based on harmonic analysis of pressure waveform

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International Journal of Engine research 2003年第2期4卷 87-101页

作者： Tsuchiya, K. Nagashima, K. Department of Mechanical Engineering Informatics School of Science and Technology Meiji University Japan Honda Motor Tochigi R&D Center Japan

A new method for calculating indicated mean effective pressure (i.m.e.p.) was derived from harmonic analysis of pressure waveform in working space, instead of conventional numerical integration of the pressure-volume (P-V) diagram. The method is applicable to a number of displacement-type machines including engines. This paper first introduces a generalized i.m.e.p. equation, then derives the specific i.m.e.p. equations for various mechanisms such as the piston-crank, swash plate, etc. The proposed i.m.e.p. equations introduced show that i.m.e.p. is determined by very low frequency components, of less than several hundred Hz, included in the pressure waveform. The reason is that the amplitude of volumetric variation becomes rapidly smaller as the order of its harmonics increases. This means that the i.m.e.p. equations proposed are more accurate where the number n of sam-pling pressure data per cycle is decreased and allow highspeed calculation as compared with the conventional method. The error of the i.m.e.p. equation for internal combustion engines with a piston-crank driving mechanism is less than ±0.1 per cent. For a Stirling engine with a ross yoke drving mechanism the erros is less than 0.4 per cent, even if n is decreased until four per cycle because the pressure waveform is close or similar to the sinusoidal wave. The digital i.m.e.p. meter developed as an application of the i.m.e.p. equation is also described, and its validation is discussed. © 2003, Institution of Mechanical Engineers. All rights reserved.

关键词： control indicated mean effective pressure (i.m.e.p.) measurement on-board i.m.e.p. meter

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designing high k dielectric films with LiPON-Al_(2)O_(3)hybrid structure by atomic layer deposition

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Chinese Physics B 2022年第5期31卷 647-651页

作者： Ze Feng Yitong Wang Jilong Hao Meiyi Jing Feng Lu Weihua Wang Yahui Cheng Shengkai Wang Hui Liu Hong dong Engineering Research Center of Thin Film Optoelectronics Technology Ministry of EducationNankai UniversityTianjin 300350China High-Frequency High-Voltage Device and Integrated Circus R&D Center Institute of Microelectronics of the Chinese Academy of SciencesBeijing 100029China

A large amount of ultra-low-power consumption electronic devices are urgently needed in the new era of the internet of things,which demand relatively low frequency ***,atomic layer deposition has been utilized to fabricate the ion polarization dielectric of the Li PON-Al_(2)O_(3) hybrid *** Li PON thin film is periodically stacked in the Al_(2)O_(3) *** hybrid structure presents a frequency-dependent dielectric constant,of which k is significantly higher than the aluminum oxide matrix from 1 k Hz to 200 k Hz in *** increased dielectric constant is attributed to the lithium ions shifting locally upon the applied electrical field,which shows an additional polarization to the Al_(2)O_(3) *** work provides a new strategy with promising potential to engineers for the dielectric constant of the gate oxide and sheds light on the application of electrolyte/dielectric hybrid structure in a variety of devices from capacitors to transistors.

关键词： high k dielectric atomic layer deposition polarization

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Fabrication of Linear Polarization-Separating Silicon Metalens at Long-Wavelength Infrared 1

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15th International Conference on Sensing technology, ICST 2022

作者： Ishizuka, Noe Li, Jie Fuji, Wataru Ikezawa, Satoshi Iwami, Kentaro Department of Mechanical Systems Engineering Tokyo University of Agriculture and Technology Fuchu Japan Opto-Science R&D Department R&D Technology Center Tamron Co. Ltd. Saitama Japan

ISBN: (数字)9783031298714

ISBN: (纸本)9783031298707

A polarization-separating metalens at the long-wavelength infrared was designed, developed, and demonstrated. The silicon quadrangular pillars are adopted as meta-atoms to achieve full 2π phase coverage at the design wavelength of 10.6 μm for both of two orthogonal linear polarizations with high transmittance. Their dimensions were determined by electromagnetic field analysis based on a finite element method, and transmittances of more than 70% were obtained in all meta-atoms. The metalens was fabricated through electron beam lithography and reactive ion etching, and SEM observation showed that the fabrication was done while maintaining good verticality. An imaging test was performed using a commercially available micro-bolometer, and it was confirmed that the light was focused at different positions for each linear polarization. In the case of 45°-polarized illumination, it was confirmed that the light was focused at both locations. The fabricated metalens successfully showed the ability of linear polarization separation of a thermal image. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Silicon

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Heat Transfer between Casting and die during High Pressure die Casting Process of AM50 Alloy-Modeling and Experimental results

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Journal of Materials Science & technology 2008年第1期24卷 131-135页

作者： Zhipeng GUO Shoumei XIONG Sang-Hyun Cho Jeong-Kil Choi Key Laboratory for Advanced Manufacturing by Materials Processing Technology Department of Mechanical Engineering Tsinghua University Beijing 100084 China Advanced Material R＆D Center Korean Institute of Industrial Technology 994-32 Dongchun-Dong Yonsu-Ku Inchon Korea

A method based on die casting experiments and mathematic modeling is presented for the determination of the heat flow density （HFd） and interfacial heat transfer coefficient （IHTC） during the high pressure die casting （HPdC） *** were carried out using step shape casting and a commercial magnesium alloy,*** profiles were measured and recorded using thermocouples embedded inside the die. Based on these temperature readings,the HFd and IHTC were successfully determined and the calculation results show that the HFd and IHTC at the metal-die interface increases sharply right after the fast phase injection process until approaching their maximum values,after which their values decrease to a much lower level until the dies are *** patterns of heat transfer behavior were found between the die and the casting at different *** thinner the casting was,the more quickly the HFd and IHTC reached their steady ***,the values for both the HFd and IHTC values were different between die and casting at different thicknesses.

关键词：： Interfacial heat transfer coefficient High pressure die casting process AM50 Magnesium alloy

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Experimental research on static strength of c-shaped steel structure in photovoltaic agricultural greenhouse 4

Experimental research on static strength of c-shaped steel s...

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2020 4th International Conference on Electrical, Mechanical and Computer engineering, ICEMCE 2020

作者： Zhimei, Wen Yulei, Zhao School of Energy and Construction Engineering Shandong Huayu University of Technology Clean Air Conditioning Engineering Technology R&D Center Dezhou253000 China

Based on the research characteristics of the C-shaped steel structure of the photovoltaic agricultural greenhouse, the stress and strain under the design load of the solar cell module support are tested. Compared with the ANSYS simulation and test data, the test results are in good agreement with the simulation analysis results. The maximum stress measured by the main steel frame structure under the required load is far less than the steel stress value, the structural safety strength is high, there is a big reduction Heavy margin. The research results can provide a reference for the engineering design of the photovoltaic agricultural greenhouse steel frame structure. © 2020 Institute of Physics Publishing. All rights reserved.

关键词： Solar power generation

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A succinct enhanced luminescence strategy for fluorescent ionic liquids and the application for detecting CO_(2)

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Green Energy & Environment 2022年第5期7卷 1093-1101页

作者： Siying Che Jiachen Guo Lu Gan Qiaoxin Xiao Haoran Li Yuanbin She Congmin Wang College of Chemical Engineering Zhejiang University of TechnologyHangzhou310014China Department of Chemistry ZJU-NHU United R&D CenterZhejiang UniversityHangzhou310027China Key Laboratory of Biomass Chemical Engineering of Ministry of Education Zhejiang UniversityHangzhou310027China

An interesting phenomenon was found that fluorophore was introduced into ionic liquid(IL)to magnify fluorescence signal via the thermally activated delayed fluorescence process;thus up to 15 fold enhancements were ***,we reported a succinct enhanced luminescence strategy to reduce single-triplet energy split by the tunability of *** strategy could be extended to more kinds of ILs by the virtue of a preliminary dFT calculation ***,the optical feature of IL sensor made it a promising candidate as a gas fluorescence sensor.

关键词： luminescence ionic liquids

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