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A Nonresonant Hybridized Electromagnetic-Triboelectric Nanogenerator for Irregular and Ultralow Frequency Blue Energy Harvesting

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research 2021年第1期2021卷 304-315页

作者： Weibo Xie Lingxiao Gao Lingke Wu Xin Chen Fayang Wang daqiao Tong Jian Zhang Jianyu Lan Xiaobin He Xiaojing Mu Ya Yang State Key Laboratory of Mechanical Transmissions Chongqing UniversityChongqing 400044China Key Laboratory of Optoelectronic Technology&Systems Ministry of Education International R&D Center of Micro-Nano Systems and New Materials TechnologyChongqing UniversityChongqing 400044China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083China College of Aerospace Engineering Chongqing UniversityChongqing 400044China Shanghai Academy of Spaceflight Technology Shanghai Institute of Space Power SourceShanghai 200245China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China Center on Nanoenergy Research School of Physical Science and TechnologyGuangxi UniversityNanningGuangxi 530004China

As a promising renewable energy source,it is a challenging task to obtain blue energy,which is irregular and has an ultralow frequency,due to the limitation of ***,a nonresonant hybridized electromagnetic-triboelectric nanogenerator was presented to efficiently obtain the ultralow frequency *** instrument adopted the flexible pendulum structure with a precise design and combined the working principle of electromagnetism and triboelectricity to realize the all-directional vibration energy acquisition *** results confirmed that the triboelectric nanogenerator(TENG)had the potential to deliver the maximum power point of about 470μW while the electromagnetic nanogenerator(EMG)can provide 523 mW at *** conversion efficiency of energy of the system reached 48.48%,which exhibited a remarkable improvement by about 2.96 times,due to the elastic buffering effect of the TENG with the double helix ***,its ability to collect low frequency wave energy was successfully proven by a buoy in Jialing *** woke provides an effective candidate to harvest irregular and ultralow frequency blue energy on a large scale.

关键词： generator precise instrument

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A 280 GHz Quadruple-Push Subharmonic down-Conversion Mixer with Load Impedance Optimization

A 280 GHz Quadruple-Push Subharmonic Down-Conversion Mixer w...

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Asia-Pacific Conference on Microwave

作者： Akihito Hirai Yuki Tsukui Shinya Yokomizo ryo Sakamaki Sho Ikeda Information Technology R&D Center Mitsubishi Electric Corporation Kamakura Kanagawa Japan Kamakura Engineering Office Mitsubishi Electric Engineering Co. Ltd. Kamakura Kanagawa Japan Defense & Space Systems Group Mitsubishi Electric Corporation Amagasaki Hyogo Japan National Institute of Advanced Industrial Science and Technology (AIST) Ibaraki Japan

This paper presents the design and fabrication of a 280 GHz quadruple-push subharmonic down-conversion mixer with optimized load impedance using a 45nm CMOS-SOI. A mixer-first architecture is widely used in sub-THz band receivers because of the difficulty of achieving high gain and low NF in low noise amplifiers. Moreover, in sub-THz band mixers, the 4th harmonic mixer is utilized to reduce the chip area and the power consumption by reducing the local oscillator frequency. The proposed 4th harmonic down-conversion mixer uses the ANd-gate switching topology for the mixer core and load impedance optimization to prevent degradation of the conversion gain. The proposed mixer achieved the measured conversion gain of −21.9 dB with a small chip area of 0.09 mm 2 by eliminating the bandpass filter.

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Leveraging pulse wave signal properties for coronary artery calcification screening in CKd patients

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Computers in Biology and Medicine 2025年 194卷 110519页

作者： Bialonczyk, Urszula Pstras, Leszek debowska, Malgorzata dai, Lu Qureshi, Abdul rashid Soderberg, Magnus Brismar, Torkel B. ripsweden, Jonaz Lindholm, Bengt Stenvinkel, Peter Poleszczuk, Jan Nalecz Institute of Biocybernetics and Biomedical Engineering Polish Academy of Sciences Warsaw Poland Aging Research Center Department of Neurobiology Care Sciences and Society Karolinska Institutet and Stockholm University Stockholm Sweden Renal Medicine and Baxter Novum Department of Clinical Science Intervention and Technology Karolinska Institutet Stockholm Sweden Pathology Clinical Pharmacology and Safety Sciences AstraZeneca R&D Gothenburg Sweden Unit of Radiology Department of Clinical Sciences Intervention and Technology Karolinska Institutet Stockholm Sweden

Background and aims: Chronic kidney disease (CKd) patients are particularly susceptible to coronary atherosclerosis, which can be assessed using computed tomography (CT)-based coronary artery calcium (CAC) score. However, such a costly examination might not always be required and cost-effective. This study investigates a novel screening approach utilizing pulse wave analysis combined with machine learning models to identify CKd patients at high risk for coronary atherosclerosis. Methods: We analyzed retrospective data from 124 CKd stage 5 patients who underwent kidney transplantation. Pulse wave signals were collected using SphygmoCor system (AtCor Medical, Sydney, Australia), and CAC scores were determined via CT scans. Machine learning models were developed using either pulse wave features or traditional risk factors (TrF) to detect high CAC scores (≥100 Agatston units). results: The pulse wave-based model outperformed TrF-based model in identifying high CAC scores, particularly among younger patients. Specifically, the pulse wave-based classifier showed superior balanced accuracy in all analyzed age groups and superior sensitivity in patients under 60 years old, especially in those under 50 years old. The overall balanced accuracy of the pulse wave-based model exceeded 80 %, suggesting its potential as a reliable screening tool for detecting high risk of coronary atherosclerosis in CKd patients. Conclusions: Pulse wave analysis combined with machine learning offers a promising, non-invasive method for preliminary CAC screening in CKd patients. This approach could enhance early risk identification and improve clinical management, although further research is needed to validate and refine this method in larger, more diverse populations. © 2025 The Author(s)

关键词： Noninvasive medical procedures

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Fabrication of High-Flux defect-Free Hollow Fiber Membranes derived from a Phenolphthalein-Based Copolyimide for Gas Separation

SSRN

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SSrN 2023年

作者： Chen, Bo Zhao, Guoke Lau, Cher Hon Wang, Fuwei Fan, Shuxin Niu, Chuang ren, Zhongzheng Tang, Gongqing Liu, Yiqun Qin, Peiyong Li, Pei College of Materials Science and Engineering Beijing University of Chemical Technology Beijing100029 China SINOPEC Beijing Research Institute of Chemical Industry Beijing100013 China Institute for Materials and Processes School of Engineering University of Edinburgh United Kingdom National Energy R&D Center for Biorefinery Tsinghua University China

In the realm of gas purifications, hollow fiber membranes have gained significant prominence due to their unique advantages. However, achieving defect-free membranes poses a considerable challenge. In this study, we addressed this challenge with a novel copolymer, 6FdA-dAM:dAP(2:1), comprising 4,4’-(hexafluoroisopropylidene) diphthalic anhydride (6FdA), 2,4.6-Trimethy-m-phenylenediamine (dAM), and a phenolphthalein-derived diamine of 3,3’-diaminophenolphthalein (dAP). We found that defect-free hollow fiber membranes could be prepared when 20 wt.% or more ethanol was added in the polymer dope solution, but this led to the formation of oval hollow fibers that would be flattened under high pressure. We solved this limitation by lowering ethanol content to 15 wt. %, adding 2 wt. % LiNO3, and increasing the air-gap distance. These measures reduced the difference in phase inversion rates between the surface region and the bulk phase of the nascent hollow fiber. The CO2 permeance of this defect-free hollow fiber membrane reached 282 GPU with a CO2/CH4 selectivity of 50.2. Highly permeable defective hollow fiber membranes were also developed using a polymer dope without LiNO3 and a low THF content of 5 wt.%. After coated by silicone rubber, the CO2 permeance of the membrane reached 554 GPU with a CO2/CH4 selectivity of 45.0. In mixed gas tests, the two membranes exhibited O2 permeances of approximately 43.3 and 75.3 GPU, with O2/N2 selectivities of 5.5 and 5.4, respectively. Their CO2 permeances were 281 and 465 GPU, with CO2/CH4 selectivities of 45 and 41, CO2/N2 selectivities of 35.7 and 33.3, respectively. These separation performances out-performed state-of-art polymeric hollow fiber membranes and demonstrated great potential for gas separation applications such as natural gas sweetening, flue gas treatment, and air separation. © 2023, The Authors. All rights reserved.

关键词： Carbon dioxide

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Parametric optimisation for 3d printing β-tricalcium phosphate tissue engineering scaffolds using direct ink writing

Smart Materials in Manufacturing

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Smart Materials in Manufacturing 2025年 3卷

作者： Belgin Paul, d.L. Praveen, Ayyappan Susila Arjunan, Arun Department of Mechanical Engineering Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology Tamil Nadu Chennai 600062 India Additive Manufacturing of Functional Materials Research Group Center for Engineering Innovation and Research University of Wolverhampton Telford Innovation Campus TF2 9NT United Kingdom

The quest for optimal bone tissue engineering materials has led to extensive research on tricalcium phosphate (TCP) ceramics, specifically the β-TCP phase, due to its superior biocompatibility and bioresorbability. Ensuring the structural fidelity and accuracy in creating porous architecture is very crucial for β-TCP scaffolds. In this regard, this study explores the critical role of 3d printing parameters such as pressure, nozzle diameter, print speed, and solid loading in determining the dimensional accuracy of β-tricalcium phosphate (β-TCP) scaffolds fabricated through direct ink writing (dIW). Experiments were conducted on a custom-built dIW system based on a four-factor, three-level L₉ Taguchi design. The influence of these parameters on dimensional accuracy was evaluated using Analysis of Variance (ANOVA). Optimal process conditions to print β-TCP were revealed as 3 bar pressure, 0.6 mm nozzle diameter, 5 mm/s print speed, and 55 vol% solid loading, yielding minimal dimensional error. ANOVA results highlighted nozzle diameter and pressure as significant factors, followed by solid loading and print speed. Validation experiments under these optimal conditions achieved a dimensional error of just 1.52 %. Additionally, the scaffold printed under optimal conditions demonstrated a compressive strength of 2.64 MPa. © 2024 The Authors

关键词： 3d printing Biomaterials direct ink writing Tissue engineering Tricalcium phosphate

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Evaluation of LiNiO2 with minimal cation mixing as a cathode for Li-ion batteries

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Chemical engineering Journal 2023年第1期456卷

作者： Yuwono, rio Akbar Wang, Fu-Ming Wu, Nae-Lih Chen, Yan-Cheng Chen, Hsi Chen, Jin-Ming Haw, Shu-Chih Lee, Jyh-Fu Xie, rui-Kun Sheu, Hwo-Shuenn Chang, Po-Ya Khotimah, Chusnul Merinda, Laurien Hsing, rocan Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei Taiwan Graduate Institute of Energy and Sustainability Technology National Taiwan University of Science and Technology Taipei Taiwan Department of Chemical Engineering Chung Yuan Christian University Taoyuan Taiwan R&D Center for Membrane Technology Chung Yuan Christian University Taoyuan Taiwan Department of Chemical Engineering National Taiwan University Taipei Taiwan National Synchrotron Radiation Research Center Hsinchu Taiwan

The electric vehicle (EV) market has grown tremendously in recent years, and is driving the development of lithium-ion batteries (LIBs) for energy storage. To meet the demand for high-energy–density and low-cost LIBs, Co-free and Ni-rich cathodes (e.g., LiNiO2;LNO) and Si anodes are being investigated. However, drawbacks of LNO, such as cation mixing, processing challenges, and safety risks significantly limit its commercialization. Increasing the oxygen partial pressure (pO2) during calcination of LNO has been shown to maintain its structural order and electrochemical performance. However, the mechanism by this observation is not well understood. In this research, three pO2 conditions were applied during the calcination of LNO cathodes. The calcination pO2 affects the sub-surface of LNO rather than the bulk region. Synchrotron spectroscopy and in-situ pressure analysis confirmed that Ni2+ and excess Li are present on the sub-surface of the LNO processed at the lowest pO2. Increasing the pO2 decreases the off-stoichiometry of LNO by providing additional oxygen to compensate for oxygen loss, especially at the sub-surface. A detailed mechanism by which the calcination pO2 affects LNO is proposed. An LIB with the LNO cathode calcined at the highest pO2 had a high initial capacity of 239.8 mA h g−1 (93.4 %), excellent fast charging cycle retention of half-cell and full cell at 55 °C, little gas evolution during cycling, and almost no weight change during storage in air. This calcining strategy prevents the cation mixing limitation of LNO, taking it one step closer to future EV application. © 2022 Elsevier B.V.

关键词： Lithium compounds

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Emulsion Gels with dual Antioxidant and Antibacterial Functions for Optimized Β-Carotene delivery: Utilizing Phenolic Acid-Modified Agarose

SSRN

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SSrN 2023年

作者： Fu, Liling ru, Yi Hong, Qinglin Weng, Huifen Zhang, Yonghui Chen, Jun Xiao, Anfeng Xiao, Qiong College of Ocean Food and Biological Engineering Jimei University Xiamen361021 China National R&D Center for Red Alga Processing Technology Xiamen361021 China Fujian Provincial Engineering Technology Research Center of Marine Functional Food Xiamen361021 China Xiamen Key Laboratory of Marine Functional Food Xiamen361021 China Foodstuff Co. Ltd. Zhangzhou363100 China

Agarose based on gel strength can not meet the needs of diverse applications, and the structural modification of agarose is helpful to improve its functional properties and promote the economic benefits of the agar industry chain. This study focuses on making agarose as an active delivery material with specific functions. Agarose (Na-Ag) was modified with phenolic acid (p-coumaric acid, caffeic acid, ferulic acid) to produce agarose derivatives. Structural characterization confirmed the successful grafting of phenolic acids onto agarose through esterification reactions at the C-6 hydroxyl position, enhancing its amphiphilic properties. Emulsifying activity increased from 6.73 for Na-Ag to 23.19 for p-coumaric acid-modified agarose (Pa-Ag), with similar improvements noted for caffeic acid (Ca-Ag) and ferulic acid (Fa-Ag) variants. Emulsion stability was visually and microscopically confirmed, showing uniform droplet distribution in modified agaroses. The study concludes that phenolic acid modifications significantly enhance the emulsifying properties and β-carotene encapsulation of agarose, suggesting a promising approach for improving the delivery and stability of lipophilic compounds in various industries. © 2023, The Authors. All rights reserved.

关键词： Organic acids

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Tactile-Sensitive NewtonianVAE for High-Accuracy Industrial Connector Insertion

arXiv

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arXiv 2022年

作者： Okumura, ryo Nishio, Nobuki Taniguchi, Tadahiro Digital&AI Technology Center Technology Division Panasonic Holdings Corporation Japan R&D Division Panasonic Connect Co. Ltd. Japan Ritsumeikan University College of Information Science and Engineering Japan

An industrial connector insertion task requires submillimeter positioning and grasp pose compensation for a plug. Thus, highly accurate estimation of the relative pose between a plug and socket is fundamental for achieving the task. World models are promising technologies for visuomotor control because they obtain appropriate state representation to jointly optimize feature extraction and latent dynamics model. recent studies show that the NewtonianVAE, a type of the world model, acquires latent space equivalent to mapping from images to physical coordinates. Proportional control can be achieved in the latent space of NewtonianVAE. However, applying NewtonianVAE to high-accuracy industrial tasks in physical environments is an open problem. Moreover, the existing framework does not consider the grasp pose compensation in the obtained latent space. In this work, we proposed tactile-sensitive NewtonianVAE and applied it to a USB connector insertion with grasp pose variation in the physical environments. We adopted a GelSight-type tactile sensor and estimated the insertion position compensated by the grasp pose of the plug. Our method trains the latent space in an end-to-end manner, and no additional engineering and annotation are required. Simple proportional control is available in the obtained latent space. Moreover, we showed that the original NewtonianVAE fails in some situations, and demonstrated that domain knowledge induction improves model accuracy. This domain knowledge can be easily obtained using robot specification and grasp pose error measurement. We demonstrated that our proposed method achieved a 100% success rate and 0.3 mm positioning accuracy in the USB connector insertion task in the physical environment. It outperformed SOTA CNN-based two-stage goal pose regression with grasp pose compensation using coordinate transformation. Copyright © 2022, The Authors. All rights reserved.

关键词： domain Knowledge

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Carbon nitride- and graphene-based materials for the photocatalytic degradation of emerging water pollutants

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Materials Advances 2024年第7期5卷 2668-2688页

作者： Indra Jaya Budiarso Valentinus Alphano dabur riska rachmantyo Hermawan Judawisastra Chechia Hu Arie Wibowo Master Program in Materials Science and Engineering Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 West Java Indonesia Doctoral Program in Materials Science and Engineering Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 West Java Indonesia Materials Science and Engineering Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 West Java Indonesia ariewibowo@itb.ac.id Department of Chemical Engineering National Taiwan University of Science and Technology Taipei 106 Taiwan R&D Center for Membrane Technology Chung Yuan Christian University Taoyuan 320 Taiwan Research Center for Nanoscience and Nanotechnology Institut Teknolgi Bandung Ganesha 10 Bandung 40132 West Java Indonesia

Photocatalytic degradation is a promising way to treat emerging pollutants in wastewater. recently, metal-free photocatalysts such as carbon nitride- and graphene-based materials have attracted much interest in the photocatalytic degradation of emerging water pollutants owing to their visible light activity and unique electrical properties, respectively. Graphitic carbon nitride (GCN) is considered a superior visible light–active photocatalyst because of its suitable bandgap (2.7 eV). Moreover, the facile synthesis process and the high chemical and thermal stability of GCN make it one of the research hotspots in photocatalytic wastewater treatment. Besides GCN, graphene and its derivatives are utilized to support main photocatalysts by enhancing their light absorption, pollutant adsorption, and photogenerated charge separation. Furthermore, the vast modification of these materials has promoted various outstanding performances in carbon nitride- and graphene-based photocatalysts in the application of pollutant degradation. In this review, we highlight recent developments in carbon nitride- and graphene-based photocatalysts (2018–2023), focusing on the strategies to improve the activity of GCN as a visible light–active photocatalyst and the role of graphene and its derivatives as supporting materials in wastewater pollutant remediation applications.

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Active Packaging Coatings Based on Agarose Caffeate: Preparation, Characterisation, and Application in Grass Carp (Ctenopharyngodon Idellus) Preservation

SSRN

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SSrN 2023年

作者： Fu, Liling ru, Yi Hong, Qinglin Zhang, Yonghui Weng, Huifen Yang, Qiuming Xiao, Qiong Xiao, Anfeng College of Ocean Food and Biological Engineering Jimei University Xiamen361021 China National R&D Center for Red Alga Processing Technology Xiamen361021 China Fujian Provincial Engineering Technology Research Center of Marine Functional Food Xiamen361021 China Xiamen Key Laboratory of Marine Functional Food Xiamen361021 China Foodstuff Co. Ltd. Zhangzhou363100 China

Caffeic acid was grafted to agarose by a nonradical synthesis method to overcome precipitation in agarose/caffeic acid blending. Structural characterization showed that the carboxyl group of caffeic acid was successfully grafted to the C6-OH of d-galactose in agarose, and the highest grafting ratio could reach 12.18%. Incorporating caffeic acid significantly increased the antioxidant and bacteriostatic activities. With the increase in grafting ratio from 0 to 12.18%, the scavenging ratio of dPPH increased from 0% to 50.09%, and the inhibition ratio of β-carotene bleaching increased from 7.49% to 72.21%. The bacteriostatic ratio of agarose caffeate (Cf-Ag) against Escherichia coli and Staphylococcus aureus could reach 100%. The fish preservation test indicated that Cf-Ag had positive effects on inhibiting bacterial growth and fat oxidation, reducing the water loss, and prolonging the overall quality of grass carp fillet during refrigeration, which was more effective than native agarose in extending the shelf life of fish. © 2023, The Authors. All rights reserved.

关键词： Fish

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