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Squid-inspired and wirelessly controllable display for active camouflage in aquatic-environment

npj Flexible Electronics 2024年第1期8卷 900-909页

作者： Doyoung Kim Seung Won Seon Minkyung Shin Jihwan Kim Bogeun Kim Janghoon Joo Sang Uk Park Wooseok Kim Hee Kyu Lee Byeong Woon Lee Se Gi Lee Su Eon Lee Ji-Hun Seo Seung Ho Han Bong Hoon Kim Sang Min Won Department of Electrical and Computer Engineering Sungkyunkwan University2066Seobu-roJangan-guSuwon 16419Republic of Korea Department of Smart Wearable Engineering Soongsil UniversitySeoul 06978Republic of Korea Electronic Convergence Materials and Devices Research Center Korea Electronics Technology Institute(KETI)Seongnam 13509Republic of Korea Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea Department of Robotics and Mechatronics Engineering DGISTDaegu 42988Republic of Korea

Achieving optimal camouflage in an aquatic environment necessitates the ability to modulate transmittance in response to the surrounding obscurity and potential *** adaptation involves a dynamic transition from transparency to a deep-blue color,especially in low-light or dark *** a strategy promotes a seamless assimilation with the surroundings,enabling the absorption of searchlights and,subsequently,diminishing the risk of detection by ***,the presence of sophisticated mechanisms that facilitates stable and efficient control of transmittance is imperative,enabling smooth transition between transparent and deep-blue hues within the aquatic *** study presents nature-inspired programmable camouflage system that integrates an electrochromic display as the primary transmittance change element and a wireless base module for power and data *** technology offers a robust and flexible construction,ensuring stable operation as demonstrated through mechanical-fatigue experiments and quantitative simulation.A custom circuit and a power-control software package enable active control of multiple electrochromic displays while submerged in water.

关键词： transparency submerged lights

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In situ SOH monitoring and estimation through ultrasonic detecting techniques

In situ SOH monitoring and estimation through ultrasonic det...

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2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

作者： Shen, Yi Zou, Bingchen Xu, Maoshu Wang, Sheng Li, Haomiao Wang, Kangli Jiang, Kai Huazhong University of Science and Technology Department of Materials Science and Engineering Wuhan China Huazhong University of Science and Technology Department of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798350316445

Monitoring and estimating the lifetime of lithium-ion batteries are essential for long-time battery operation. However, traditional battery state-of-health (SOH) detecting methods are either inaccurate or time-consuming, which gives rise to more convenient and accurate methods. Ultrasonic detecting technique is a promising candidate in non-destructive, easy-operating, and precise battery SOH monitoring. In this paper, we report a novel data-obtaining method for battery SOH monitoring and estimation. The capacity fading process is perfectly reflected through ultrasonic detecting as well as the specific electrochemical reaction. Moreover, ultrasonic signals are applied to estimate battery SOH through the long short-term memory model. The Root Mean Square Error of 20-cycle estimation under 4C is 0.00748, which opens a door for applying ultrasonic detecting methods in battery SOH estimation. © 2023 IEEE.

关键词： lithium-ion battery state-of-health estimation ultrasonic detecting

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Design of a Wideband Transmitarray Phaser Using Vivaldi Antenna for Dispersive Delay Radiation

Design of a Wideband Transmitarray Phaser Using Vivaldi Ante...

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2023 International Applied Computational Electromagnetics Society Symposium, ACES-China 2023

作者： Wei, Yifei Wang, Hong Zhang, Qingfeng Southern University of Science and Technology Department of Electrical and Electronic Engineering Shenzhen China Southern University of Science and Technology Department of Materials Science and Engineering Shenzhen China

ISBN: (纸本)9781733509657

In this paper, a broadband transmitarray antenna for dispersive delay radiation based Vivaldi antenna operating at 0.1 THz band is presented. The unit cell consists of two Vivaldi antennas that transmit and receive signals and a linear group delay engineering non-common-pass transmission line network. The whole structure is designed on the low temperature co-fired ceramic (LTCC) substrate and can achieve 0.06ns variation of phase group delay in the operating band (75-105GHz) which can operates as a phaser. The return loss of the whole system is greater than 17 dB in the operating band, indicating that the structure can be practically processed. The proposed transmi-tar ray antenna phasers have potential applications in reducing the accuracy requirements of digital-to-analog converters and in millimeter-wave and terahertz analog signal processing. © 2023 Applied Computational Electromagnetics Society (ACES).

关键词： Temperature

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Recent advances in bio-integrated electrochemical sensors for neuroengineering

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Fundamental Research 2025年第1期5卷 29-47页

作者： Shulin Chen Tzu-Li Liu Yizhen Jia Jinghua Li Department of Materials Science and Engineering The Ohio State UniversityColumbusOH 43210USA Chronic Brain Injury Program The Ohio State UniversityColumbusOH 43210USA

Detecting and diagnosing neurological diseases in modern healthcare presents substantial challenges that directly impact patient *** complex nature of these conditions demands precise and quantitative monitoring of disease-associated biomarkers in a continuous,real-time *** chemical sensing strategies exhibit restricted clinical effectiveness due to labor-intensive laboratory analysis prerequisites,dependence on clinician expertise,and prolonged and recurrent ***-integrated electronics for chemical sensing is an emerging,multidisciplinary field enabled by rapid advances in electrical engineering,biosensing,materials science,analytical chemistry,and biomedical *** review presents an overview of recent progress in bio-integrated electrochemical sensors,with an emphasis on their relevance to neuroengineering and *** traverses vital neurological biomarkers and explores bio-recognition elements,sensing strategies,transducer designs,and wireless signal transmission *** integration of in vivo biochemical sensors is showcased through *** review concludes by outlining future trends and advancements in in vivo electrochemical sensing,and highlighting ongoing research and technological innovation,which aims to provide inspiring and practical instructions for future research.

关键词： Biochemical sensing Neuroengineering Bioimplants Analytical chemistry Bio-integrated electronics

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FeSb@N-doped carbon quantum dots anchored in 3D porous N-doped carbon with pseudocapacitance effect enabling fast and ultrastable potassium storage

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Nano Research 2022年第1期15卷 217-224页

作者： Zhihui Li Qingmeng Gan Yifan Zhang Jing Hu Peng Liu Changhong Xu Xibing Wu Yilin Ge Feng Wang Qingrong Yao Zhouguang Lu Jianqiu Deng School of Materials Science and Engineering&Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin 541004China Department of Materials Science and Engineering Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and DevicesSouthern University of Science and TechnologyShenzhen 518055China

Potassium-ion batteries(PIBs)are promising ne15t-generation energy storage candidates due to abundant resources and low ***-based materials with high theoretical capacity(660 mAh·g^(-1))and low working potential are considered as promising anode for *** remaining challenge is poor stability and slow *** this work,FeSb@N-doped carbon quantum dots anchored in three-dimensional(3D)porous N-doped carbon(FeSb@C/Nc3DC/N),a Sb-based material with a particular structure,is designed and constructed by a green salt-template *** an anode for PIBs,it exhibits extraordinarily high-rate and long-cycle stability(a capacity of 245 mAh·g^(-1) at 3,080 mAh·g^(-1) after 1,000 cycles).The pseudocapacitance contribution(83%)is demonstrated as the origin of high-rate performance of the FeSb@C/NС3DC/N ***,the potassium storage mechanism in the electrode is systematically investigated through ex-situ characterization techniques including ex-situ transmission electron microscopy(TEM)and X-ray photoelectron spectroscopy(XPS).Overall,this study could provide a useful guidance for future design of high-performance electrode materials for PIBs.

关键词： potassium-ion batteries anode fesb alloy quantum dots high rate pseudocapacitance

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A Study on the Performance Improvement of Axial Flux Permanent Magnet Machines Based on Stator and Rotor Design Modifications

A Study on the Performance Improvement of Axial Flux Permane...

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2024 IEEE Energy Conversion Congress and Exposition, ECCE 2024

作者： Yun, Jangho Grainger, Brandon Ohodnicki, Paul University of Pittsburgh Department of Mechanical Engineering and Materials Science PittsburghPA United States University of Pittsburgh Department of Electrical and Computer Engineering PittsburghPA United States

ISBN: (纸本)9798350376067

Axial flux permanent magnet (AFPM) machines have technological competitiveness for electric propulsion systems that require compact structures and high-power density. However, challenging design and manufacturing problems that reduce the cost competitiveness cause designers to limit designable variables. In this paper, the effects of slot/pole combination, semi-closed slot, magnetic wedge, and segmented PM on performance in double-sided rotor and double-sided stator geometries designed with stator open slots were investigated through 3-D finite element analysis (FEA). FEA results show that the design variables have a significant impact on torque, torque ripple, and losses. Semi-closed slots or magnetic wedges reduce PM losses for each open slot model by more than 80%, significantly reducing losses compared to segmented PMs, and also reducing torque ripple. As an alternative to stator design modification, results indicate the open slot model can be considered with a slot/pole combination for low cogging torque to reduce torque ripple and segmented PMs to reduce PM losses. © 2024 IEEE.

关键词： Stators

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Block Sequence Effects on the Self-Assembly Behaviors of Polypeptide-Based Penta-Block Copolymer Hydrogels

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ACS Applied materials and Interfaces 2024年第5期16卷 6674-6686页

作者： Wang, Ke-Hsin Liu, Chung-Hao Tan, Dun-Heng Nieh, Mu-Ping Su, Wei-Fang Department of Materials Science and Engineering National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei10617 Taiwan Polymer program Institute of Materials Science University of Connecticut 25 King Hill Road Unit 3136 StorrsCT06269-3136 United States Department of Chemical and Biomolecular Engineering University of Connecticut StorrsCT06269 United States Department of Materials Engineering Ming-Chi University of Technology 84 Gungjuan Rd. New Taipei City243303 Taiwan

Peptide-based hydrogels have great potential for applications in tissue engineering, drug delivery, and so on. We systematically synthesize, characterize, and investigate the self-assembly behaviors of a series of polypeptide-based penta-block copolymers by varying block sequences and lengths. The copolymers contain hydrophobic blocks of poly(γ-benzyl-l-glutamate) (PBG, Bx) and two kinds of hydrophilic blocks, poly(l-lysine) (PLL, Ky) and poly(ethylene glycol) (PEG, EG34), where x and y are the number of repeating units of each block, where PBG and PLL blocks have unique functions for nerve regeneration and cell adhesion. It shows that a sufficient length of the middle hydrophilic segment capped with hydrophobic end PBG blocks is required. They first self-assemble into flower-like micelles and sequentially form transparent hydrogels (as low as 2.3 wt %) with increased polymer concentration. The hydrogels contain a microscale porous structure, a desired property for tissue engineering to facilitate the access of nutrient flow for cell growth and drug delivery systems with high efficiency of drug storage. We hypothesize that the structure of Bx-Ky-EG34-Ky-Bx agglomerates is beyond micron size (transparent), while that of Ky-Bx-EG34-Bx-Ky is on the submicron scale (opaque). We establish a working strategy to synthesize a polypeptide-based block copolymer with a wide window of sol-gel transition. The study offers insight into rational polypeptide hydrogel design with specific morphology, exploring the novel materials as potential candidates for neural tissue engineering. © 2024 The Authors. Published by American Chemical Society

关键词： Block copolymers

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MnBi IPMSM and PMASynRM Torque Density Limitations due to Temperature-Dependent Demagnetization

MnBi IPMSM and PMASynRM Torque Density Limitations due to Te...

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2024 IEEE Energy Conversion Congress and Exposition, ECCE 2024

作者： Brody, Ryan Ohodnicki, Paul Grainger, Brandon University of Pittsburgh Department of Electrical and Computer Engineering PittsburghPA United States University of Pittsburgh Department of Mechanical Engineering and Materials Science PittsburghPA United States

ISBN: (纸本)9798350376067

Permanent magnets (PM) demagnetization occurs when applying external fields opposite the PM's polarity. To a certain degree, this effect is reversible and useful in high-speed permanent magnet synchronous motors (PMSMs) by enabling flux weakening control and reluctance torque. However, relatively large external fields cause irreversible demagnetization, damaging the magnet and, thus, the motor. In PMSMs, irreversible demagnetization can significantly limit torque density, especially when using rare earth (RE) free PMs with low coercivity. Irreversible demagnetization risk can be controlled in motor designs to increase torque density if the motor drive is designed appropriately, but the impact of this relationship has yet to be quantified statistically. Therefore, this paper does so by designing and comparing PMSMs with varying demagnetization risk and comparing their performance in terms of torque density and short circuit current. The motor designs presented here are based on the specifications for the 2011 Nissan Leaf, and electric vehicles (EVs) contribute significantly to RE PM demand by typically using interior permanent magnet motors (IPMSMs) with RE PMs. Therefore, the authors also assess demagnetization risk during EV drive cycles for the MnBi motor designs presented here. Because demagnetization effects are particularly limiting in permanent magnet assisted synchronous reluctance motors (PMASynRM) that use MnBi PMs, this paper focuses on various MnBi PMASynRM designs and compare them to a MnBi IPMSM design previously published by the authors. © 2024 IEEE.

关键词： Demagnetization

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Stabilizing Schottky junction in conjugated polymer diodes enables long-term reliable radio-frequency energy harvesting on plastic

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npj Flexible Electronics 2024年第1期8卷 487-497页

作者： Yongwoo Lee Boseok Kang Sungjune Jung Jimin Kwon Departemnt of Electrical Engineering Ulsan National Institute of Science and Technology(UNIST)50 UNIST-GilUlsan44919Republic of Korea SKKU Advanced Institute of Nanotechnology(SAINT) Department of Nano Science and Technologyand Department of Nano EngineeringSungkyunkwan University(SKKU)Suwon16419Republic of Korea Departemnt of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)77 Cheongam-RoPohang37673Republic of Korea

Due to their inherent flexibility,solution-processable conjugated polymers are increasingly being considered for the cost-effective production of thin-film semiconductor devices used in Internet of Everything(IoE)*** considerable improvements in charge carrier mobilities,the final challenge impeding the commercialization of conjugated polymers may be improving their environmental and electrical *** studies have improved the stability of computing devices(i.e.,transistors)by eliminating interface traps and water molecules within conjugated ***,the stability issue of Schottky diodes,which play a crucial role in configuring thinfilm IoE devices used in wireless communication and energy harvesting,has been largely *** study reveals that aluminum,which is commonly used as a cathode metal in polymer Schottky diodes,creates a nonstoichiometric effect when deposited on conjugated polymers,thereby leading to the formation of charge traps over time,which reduces the rectification ratio of the Schottky diodes and induces a significant bias stress effect during *** address this issue,we introduce a zinc-oxide sacrificial interlayer between the conjugated polymer and *** interlayer effectively eliminates the penetrated Al metal or ionized Al-induced nonstoichiometric effect without reducing the charge injection efficiency,achieving exceptional environmental and operational *** printed polymer Schottky diodes demonstrate consistent rectifying operation at 13.56MHz for several months with negligible changes in electrical characteristics.

关键词： diodes Schottky polymer

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Application of a Self-Assembly Sensing Layer to Grating Sensor Cabinets for Biomedical Sensing of Rheumatoid Arthritis Antigen-Antibodies

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IEEE Sensors Journal 2024年第7期24卷 10039-10047页

作者： Wen, Hsin-Yi Hsu, Hsiang-Cheng Feng, Wen-Kai Jhan, Kai-Siang Yeh, Yao-Tsung Chiang, Chia-Chin National Kaohsiung University of Science and Technology Department of Chemical and Materials Engineering Kaohsiung80778 Taiwan National Kaohsiung University of Science and Technology College of Maritime Department of Ph.D. Program in Maritime Science and Technology Kaohsiung807618 Taiwan National Kaohsiung University of Science and Technology Department of Mechanical Engineering Kaohsiung80778 Taiwan Fooyin University Department of Medical Laboratory Science and Biotechnology Kaohsiung83102 Taiwan

In this article, we harnessed biomedical applications in laser-assisted etching long-period fiber gratings (LLPFGs) sensors, subsequently deploying them within the realm of biomedical applications. The primary aim of this study was to devise a sensitive method for the detection of antigen-antibodies associated with rheumatoid arthritis (RA) using LLPFGs. Sensing the antigen binding took place on the surface of the optical fiber through a self-assembling process. Given the inherent limitations of conventional rheumatoid factor (RF) testing in terms of specificity, we introduced an innovative serum-based approach geared toward the identification of anti-cyclic citrullinated peptide (Anti-CCP) antibodies. This method exhibited an impressive diagnostic accuracy rate of approximately 80% for RA cases, coupled with an exceptional specificity level of 98% for individuals without RA. The incorporation of LLPFGs in the detection of RA antigen-antibodies presents a highly promising avenue for enhancing the precision and reliability of RA diagnosis. Furthermore, this research aligns closely with the United Nations Sustainable Development Goal (SDG)3, which strives to promote well-being across all age groups and advance sustainable development by addressing health-related challenges, including the accurate diagnosis of diseases like RA. © 2023 IEEE.

关键词： Antibodies

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