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Particuology 2016年第1期14卷 44-60页

作者： Jun-Yee Leong Weng-Hoong Lam Kiang-Wei Ho Wan-Ping Voo micky fu-xiang lee Hui-Peng Lim Swee-Lu Lim Beng-Ti Tey Denis Poncelet alan Lagoon Selatan Bandar Sunway Selangor 46150 Malaysia Advanced Engineering Platform Monash University Malaysia Jalan Lagoon Selatan Bandar Sunway Selangor 46150 Malaysia Oniris UMR CNRS 6144 GEPEA rue de la Geraudiere BP82225 Nantes 44322 France

Alginate is a biopolymer that has exceptional gelling properties, which allow easy gel formation under safe and mild conditions. Consequently, it is often used to encapsulate a variety of cargos, such as cells, enzymes, and lipids, and is typically employed as a model to study hydrogel-based encapsulation sys- tems. Since the first use of alginate in the encapsulation field in the 1970s, many methods have been developed to produce alginate hydrogel particles of different sizes, structures, and morphologies. This review provides an overview of the current progress in the fabrication of alginate hydrogels with vari- ous particle designs, including a discussion of dispersion techniques to pre-template alginate particles, gelation mechanisms, considerations in selecting suitable fabrication methods, and future directions.

关键词： Alginate lonotropic gelation Immobilization Encapsulation Hydrogel

Secure Image Hiding Scheme Based on Magic Signet

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Journal of Electronic Science and Technology 2020年第1期18卷 93-101页

作者： Chin-Feng lee Ying-xiang Wang Department of Information Management Chaoyang University of TechnologyTaichung 41349

Image data hiding technology is secret communications that carry hidden data in such a way that no one except the sender and intended recipients can even realize there is a hidden message. High embedding capacity,good images quality, and security are three important essentials. In this paper, each confidential hexadecimal will be carried by two cover pixels based on a magic matrix generated from a square template to reach the goal of higher embedding capacity while keeping good image visualization. Experimental results reveal that the proposed scheme guarantees higher embedding capacity of 2 bits per pixel and has the peak signal-to-noise ratio(PSNR) of 44.7 dB on average. Moreover, secret keys are used to ensure security consideration.

关键词： Data hiding embedding capacity steganography visual quality

Subintimal recanalization for non-acute occlusion of intracranial vertebral artery in an emergency endovascular procedure:A case report

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World Journal of Clinical Cases 2023年第24期11卷 5762-5771页

作者： Jun-Feng fu xiang-Ling Zhang Shun-Yin lee Fo-Ming Zhang Jin-Song You The Second Clinical College Guangzhou University of Chinese MedicineGuangzhou 510000Guangdong ProvinceChina Department of Neurosurgery The Second Affiliated HospitalGuangzhou University of Chinese MedicineGuangzhou 510000Guangdong ProvinceChina

BACKGROUND Endovascular recanalization of non-acute intracranial artery occlusion is technically difficult,particularly when the microwire enters the *** the subintimal tracking and re-entry technique has been well established in the endovascular treatment of coronary artery occlusion,there is limited experience with its use in intracranial occlusion due to anatomical variations and a lack of dedicated *** SUMMARY A 74-year-old man was admitted to the hospital two days after experiencing acute weakness in both lower extremities,poor speech,and *** admission,imaging revealed acute ischemic stroke and non-acute occlusion of bilateral intracranial vertebral arteries(ICVAs).On the fourth day of admission,the patient's condition deteriorated and an emergency endovascular recanalization of the left ICVA was *** this procedure,a microwire was advanced in the subintima of the vessel wall and successfully reentered the distal true *** stents were implanted in the *** patient's Modified Rankin Scale was 1 at three months *** We present a technical case of subintimal recanalization for non-acute ICVA occlusion in an emergency endovascular ***,we emphasize the necessity for caution when applying the subintimal tracking approach in intracranial occlusion due to the significant dangers involved.

关键词： Subintimal tracking and re-entry Large artery intracranial occlusive disease Chronic total occlusion Endovascular treatment Acute ischemic stroke Case report

Single-molecule devices reveal step-by-step dynamics of hydrogen bonds

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Science China Chemistry 2018年第6期61卷 639-640页

作者： Lifa Ni Dong xiang Takhee lee Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology College of Electronic Information and Optical Engineering Nankai University Department of Physics and Astronomy Seoul National University

Intermolecular interactions,including hydrogen bonding,hydrophobic interactions,halogen bonding etc.,are ubiquitous in nature,which play key roles in the basic chemical,physical and biochemical process of *** them,hydrogen bonds are particularly attractive because they dominate many important structures and functions in nature from elegant base-pair interactions in DNAs to sophisticated protein folding and are regarded as an important element in the discovery of new *** better elucidate fundamental mechanisms,

关键词：氢结合单个分子动力学设备相互作用生物化学分子间 DNA

A flexible three-dimensional electrode mesh:An enabling technology for wireless brain-computer interface prostheses

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Microsystems & Nanoengineering 2016年第1期2卷 222-229页

作者： Zhuolin xiang Jingquan Liu Chengkuo lee Department of Electrical and Computer Engineering National University of Singapore4 Engineering Drive 3Singapore 117583Singapore Singapore Institute for Neurotechnology(SINAPSE) National University of Singapore28 Medical Drive#05-CORSingapore 117456Singapore Center for Intelligent Sensors and MEMS National University of Singapore4 Engineering Drive 3Singapore 117583Singapore NUS Suzhou Research Institute(NUSRI) Suzhou Industrial ParkSuzhou 215123China National Key Laboratory of Science and Technology on Micro/Nano Fabrication Department of Micro/NanoElectronicsShanghai Jiao Tong UniversityShanghai 200240China

The neural interface is a key component in wireless brain–computer *** this study,we demonstrate that a unique three-dimensional(3D)microneedle electrode on a flexible mesh substrate,which can be fabricated without complicated micromachining techniques,is conformal to the tissues with minimal ***,we demonstrate that it can be applied to different functional layers in the nervous system without length *** microneedle electrode is fabricated using drawing lithography technology from biocompatible *** this approach,the profile of a 3D microneedle electrode array is determined by the design of a two-dimensional(2D)pattern on the mask,which can be used to access different functional layers in different locations of the *** to the sufficient stiffness of the electrode and the excellent flexibility of the mesh substrate,the electrode can penetrate into the tissue with its bottom layer fully conformal to the curved brain ***,the exposed contact at the end of the microneedle electrode can successfully acquire neural signals from the brain.

关键词： drawing lithography flexible electrode neural interfaces 3D microneedle electrode

An Image Edge Detection Algorithm Based on Multi-Feature fusion

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Computers, Materials & Continua 2022年第12期73卷 4995-5009页

作者： Zhenzhou Wang Kangyang Li xiang Wang Antonio lee School of Information Science and Engineering Hebei University of Science and TechnologyShijiazhuang050000China Department of Geophysical Engineering Karadeniz Technical UniversityTrabzon61080Turkey

Edge detection is one of the core steps of image processing and computer *** and fine image edge will make further target detection and semantic segmentation more ***-Nested edge detection(HED)edge detection network has been proved to be a deep-learning network with better performance for edge ***,it is found that when the HED network is used in overlapping complex multi-edge scenarios for automatic object *** will be detected edge incomplete,not smooth and other *** solve these problems,an image edge detection algorithm based on improved HED and feature fusion is *** the one hand,features are extracted using the improved HED network:the HED convolution layer is *** residual variable convolution block is used to replace the normal convolution enhancement model to extract features from edges of different sizes and ***,the empty convolution is used to replace the original pooling layer to expand the receptive field and retain more global information to obtain comprehensive feature *** the other hand,edges are extracted using Otsu algorithm:Otsu-Canny algorithm is used to adaptively adjust the threshold value in the global scene to achieve the edge detection under the optimal threshold ***,the edge extracted by improved HED network and Otsu-Canny algorithm is fused to obtain the final *** results show that on the Berkeley University Data Set(BSDS500)the optimal data set size(ODS)F-measure of the proposed algorithm is 0.793;the average precision(AP)of the algorithm is 0.849;detection speed can reach more than 25 frames per second(FPS),which confirms the effectiveness of the proposed method.

关键词： Computer vision edge detection deep learning feature fusion residual convolution

What makes the Tc of monolayer FeSe on SrTiO3 so high： a sign-problem-free quantum Monte Carlo study

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Science Bulletin 2016年第12期61卷 925-930页

作者： Zi-xiang Li Fa Wang Hong Yao Dung-Hai lee Institute for Advanced Study Tsinghua UniversityBeijing 100084China International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China Department of Physics University of CaliforniaBerkeleyCA 94720USA Materials Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA

Monolayer FeSe films grown on SrTiO_3(STO)substrate show superconducting gap-opening temperatures(T_c) which are almost an order of magnitude higher than those of the bulk FeSe and are highest among all known Fe-based superconductors. Angle-resolved photoemission spectroscopy observed ‘‘replica bands' ' suggesting the importance of the interaction between FeSe electrons and STO phonons. These facts rejuvenated the quest for T_c enhancement mechanisms in iron-based, especially ironchalcogenide, superconductors. Here, we perform the first numerically-exact sign-problem-free quantum Monte Carlo simulations to iron-based superconductors. We(1) study the electronic pairing mechanism intrinsic to heavily electron doped FeSe films, and(2) examine the effects of electron–phonon interaction between FeSe and STO as well as nematic fluctuations on T_c. Armed with these results, we return to the question ‘‘what makes the Tcof monolayer FeSe on SrTiO_3 so high?'' in the conclusion and discussions.

关键词： High temperature superconductivity Pairing mechanism Iron-based superconductivity FeSe/STO Sign-problem-free quantum Monte-Carlosimulation

Symmetry protected topological Luttinger liquids and the phase transition between them

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Science Bulletin 2018年第12期63卷 753-758页

作者： Hong-Chen Jiang Zi-xiang Li Alexander Seidel Dung-Hai lee Stanford Institute for Materials and Energy Science SLAC and Stanford UniversityMenlo ParkCA 94025USA Department of Physics University of CaliforniaBerkeleyCA 94720USA Department of Physics Washington University.St.LouisMO 63130USA Materials Sciences Division.Lawrence Berkeley National Laboratory BerkeleyCA 94720USA

We show that a doped spin-1/2 ladder with antiferromagnetic intra-chain and ferromagnetic inter-chain coupling is a symmetry protected topologically non-trivial Luttinger *** on a large easy-plane spin anisotropy drives the system to a topologically-trivial Luttinger *** phases have full spin gaps and exhibit power-law superconducting pair *** Cooper pair symmetry is singlet dxy in the non-trivial phase and triplet Sz? 0 in the trivial *** topologically non-trivial Luttinger liquid exhibits gapless spin excitations in the presence of a boundary,and it has no non-interacting or mean-field theory analog even when the fluctuating phase in the charge sector is *** a function of the strength of spin anisotropy there is a topological phase transition upon which the spin gap *** speculate these Luttinger liquids are relevant to the superconductivity in metalized integer spin ladders or chains.

关键词： Topological Luttinger liquids Symmetry protected topological phase Phase transition Superconductivity Density-matrix renormalization group

Cross Trajectory Gaussian Process Regression Model for Battery Health Prediction

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Journal of Modern Power Systems and Clean Energy 2021年第5期9卷 1217-1226页

作者： Jianshe Feng Xiaodong Jia Haoshu Cai Feng Zhu xiang Li Jay lee NSF I/UCR Center for Intelligent Maintenance Systems Department of Mechanical EngineeringUniversity of CincinnatiCincinnatiUSA

Accurate battery capacity prediction is important to ensure reliable battery operation and reduce the ***,the complex nature of battery degradation and the presence of capacity regeneration phenomenon render the prediction task very *** address this problem,this paper proposes a novel and efficient algorithm to predict the battery capacity trajectory in a multi-cell *** proposed method is a new variant of Gaussian process regression(GPR)model,and it utilizes similar trajectories in the historical data to enhance the prediction of desired capacity *** importantly,the proposed method adds no extra computation cost to the standard *** demonstrate the effectiveness of the proposed method,validation tests on two different battery datasets are implemented in the case *** prediction results and the computation cost are carefully benchmarked with cuttingedge GPR approaches for battery capacity prediction.

关键词： Prognostic lithium-ion battery Gaussian process regression state of health

Effects of Applied Stresses on Martensite Transformation in AISI4340 Steel

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Journal of Iron and Steel Research International 2007年第6期14卷 63-67页

作者： ZHAO Hong zhuang Seok-jae lee Young-kook lee LIU xiang-hua WANG Guo-dong State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China Department of Metallurgical Engineering Yonsei University Seoul 120-749 South Korea

This study aims at the experimental analysis of the transformation induced plasticity （TRIP） phenomenon. Experiments are conducted in which martensite is allowed to grow under the influence of a series of externally applied stresses. The magnitude of the applied stresses is less than 67% of the yield strength of austenite σγ （Ts）. Since there is no obvious difference between the transformation plasticity under tension and the compression for the lower applied stresses, only compressive stresses are applied. The results confirm that the transformation plasticity is proportional to the applied stress if the latter does not exceed 67 % of σγ （Ts）. The TRiP-strain, the kinetics, and their dependence on the applied stresses are studied. The comparison between calculated results and experimental results shows that the model accurately describes the phenomenon.

关键词： applied stress TRIP martensite transformation low-alloy steel