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Optimizing Emission Stability in Blue Perovskite Light-Emitting Diodes via Oxygen-Plasma Treatment of NixOy Hole Transport Layer

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advanced Optical Materials 2024年第11期12卷

作者： Yan, Zhen-Li Huang, Hong-Yu Benas, Jean-Sebastien Yang, Ching-Wei Su, Chun-Jen Liang, Fang-Cheng Chen, Wei-Cheng Tsai, Hsinhan Jeng, Ru-Jong Kuo, Chi-Ching Institute of Polymer Science and Engineering and Advanced Research Center for Green Materials Science and Technology National Taiwan University Taipei10617 Taiwan Institute of Organic and Polymeric Materials Research and Development Center of Smart Textile Technology National Taipei University of Technology Taipei10608 Taiwan National Synchrotron Radiation Research Center 101 Hsin-Ann Road Hsinchu Science Park Hsinchu30076 Taiwan Department of Chemistry University of California Berkeley BerkeleyCA94720 United States

Currently, wide-color gamut perovskite light-emitting diodes (PeLEDs) are commonly controlled through halide composition tuning. However, the formation of perovskite crystals involving different ion radii of halogens often results in structural fragility and ionic defects, leading to emission instability during operation. This study showcases a novel approach to achieving a homogeneous and low-defect crystalline state by regulating the thermodynamic nucleation mechanism of sky-blue perovskite, thereby enhancing emission stability. Utilizing oxygen-plasma treatment, a highly uniform surface energy is ensured for the nickel oxide acting as a hole transport layer. This treatment not only induces homogeneous nucleation of the perovskite layer but also effectively suppresses crystal defects. Simultaneously, the uniform surface energy alleviates halide phase separation caused by Ostwald ripening. Upon optimizing the fabrication conditions for sky-blue perovskite, the resulting PeLEDs, featuring an electroluminescent peak at 486 nm, attain a luminance of 1125.3 cd m−2 with exceptional electroluminescent stability and a T50 lifetime. Furthermore, gaining insights into the thermodynamic nucleation mechanism in mix-halides and perovskites contributes to the advancement of research on sky-blue PeLEDs and offers valuable perspectives for future development. © 2024 Wiley-VCH GmbH.

关键词： Nucleation

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Mgtio3-Catio3 Microwave Dielectric Ceramics For High Performance Dielectric Resonator Antenna By Optimized Epoxy Gelcasting

SSRN

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SSRN 2024年

作者： Zhu, Yu Li, Xiaokang Guo, Baolin Wu, Yiwen Wu, Bowen Zhai, Lipeng Shi, Jin Yao, Qing School of Mechanical Engineering Nantong University Nantong226019 China School of Information Science and Technology Research Center for Intelligent Information Technology Nantong Key Laboratory of Advanced Microwave Technology Nantong University Nantong226019 China

MgTiO3-CaTiO3 ceramics have been widely used in 5G antenna systems. In this study, the MgTiO3-CaTiO3 ceramics were fabricated by epoxy gelcasting and compared with dry pressing. The effects of slurry rheological properties and sintering temperature on the microstructure and microwave dielectric properties of ceramics were studied. It was found that epoxy gelcasting could significantly increase the Q×f value. The Q×f value of the epoxy gelcasting reached 63377 GHz, representing a 17.3% increase compared to the dry pressing value of 54000 GHz. Additionally, the sintering temperature was reduced by 25 ℃. Furthermore, the high Q×f value of the EGDGE-PEI gelcasting optimised MgTiO3-CaTiO3 ceramics suggests great potential for use in 5G antenna systems. The MgTiO3-CaTiO3 dielectric resonator antenna was designed and fabricated, exhibiting a resonance frequency of 4.18 GHz with a bandwidth of approximately 100 MHz. The simulated gain and efficiency were found to be 6.46 dBi and 96.2%, respectively. © 2024, The Authors. All rights reserved.

关键词： Microwave antennas

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Anti-infection mechanism of a novel dental implant made of titanium-copper(TiCu)alloy and its mechanism associated with oral microbiology

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Bioactive Materials 2022年第2期7卷 381-395页

作者： Hui Liu Yulong Tang Shuyuan Zhang Huan Liu Zijian Wang Yue Li Xinluan Wang Ling Ren Ke Yang Ling Qin School of Materials Science and Engineering University of Science and Technology of China96 Jinzhai RoadHefei230026China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang110016China Department of Stomatology General Hospital of Northern Military Area83 Wenhua RoadShenyang110016China Translational Medicine R&D Center Institute of Biomedical and Health EngineeringShenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen518057China Musculoskeletal Research Laboratory of Department of Orthopaedics&Traumatology and Innovative Orthopaedic Biomaterial and Drug Translational Research Laboratory of Li Ka Shing Institute of Health The Chinese University of Hong KongHong Kong Special Administrative Region of China

This work was focused on study of anti-infection ability and its underlying mechanism of a novel dental implant made of titanium-copper(TiCu)*** general,most studies on antibacterial implants have used a single pathogen to test their anti-infection ability using infectious animal ***,dental implant-associated infections are polymicrobial *** innovatively combine the classic ligature model in dogs with sucrose-rich diets to induce oral infections via the canine native oral *** anti-infection ability,biocompatibility and underlying mechanism of TiCu implant were systematically investigated in comparison with pure Ti implant via general inspection,hematology,imageology(micro-CT),microbiology(16S rDNA and metagenome),histology,and Cu ion *** with Ti implant,TiCu implant demonstrated remarkable anti-infection potentials with excellent ***,the underlying anti-infection mechanism of TiCu implant was considered to involve maintaining the oral microbiota *** was found that the carbohydrates in the plaques formed on the surface of TiCu implant were metabolized through the tricarboxylic acid cycle(TCA)cycles,which prevented the formation of an acidic microenvironment and inhibited the accumulation of acidogens and pathogens,thereby maintaining the microflora balance between aerobic and anaerobic bacteria.

关键词： Titanium-copper alloy implants Anti-infection Oral microbiology Biosafety

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Effect of molybdenum on interfacial properties of titanium carbide reinforced Fe composite

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Journal of Materials science & technology 2022年第12期107卷 252-258页

作者： Seungchan Cho Junghwan Kim Ilguk Jo Jae Hyun Park Jaekwang Lee Hyun-Uk Hong Bong Ho Lee Wook Ryol Hwang Dong-Woo Suh Sang-Kwan Lee Sang-Bok Lee Composites Research Division Korea Institute of Materials Science(KIMS)Changwon 51508South Korea Advanced Materials Engineering Dong-Eui UniversityBusan 47340South Korea Department of Aerospace and Software Engineering Gyeongsang National UniversityJinju 52828South Korea Department of Physics Pusan National UniversityBusan 46241South Korea Department of Materials Convergence and System Engineering Changwon National UniversityChangwon 51140South Korea Center for Core Research Facilities Daegu Gyeongbuk Institute of Science and TechnologyDaegu 42988South Korea School of Mechanical Engineering Gyeongsang National UniversityJinju 52828South Korea Graduate Institute of Ferrous Technology Pohang University of Science and TechnologyGyeongbuk 37673South Korea

This study shows that the mechanical strength of the composite of Fe matrix and titanium carbide(Ti C)ceramic particles is significantly enhanced with addition of molybdenum(Mo) atoms. Ti C reinforced Fe(Fe-0.2C-7Mn) composites with and without Mo were fabricated by a liquid pressing infiltration(LPI)process and the effect of Mo on interfacial properties of TiC–Fe composite was investigated using atomic probe tomography(APT) analysis, molecular dynamics(MD) simulations, first-principle density functional theory(DFT), and thermodynamic calculations. First, DFT calculations showed that total energies of the Mo-doped Ti C–Fe superlattices strongly depend on the position of Mo defects, and are minimized when the Mo atom is located at the TiC/Fe interface, supporting the probable formation of MoC-like interphase at the TiC/Fe interface region. Then, APT analysis confirmed the DFT predictions by finding that about6.5 wt.% Mo is incorporated in the Ti C–Fe(Mo) composite and that sub-micrometer thick(Ti,Mo)C interphase is indeed formed near the interface. The MD simulations show that Mo atoms migrate to the Mo-free TiC–Fe interface at elevated temperatures and the mechanical strength of the interface is considerably enhanced, which is in good agreement with experimental observations.

关键词： Metal matrix composites(MMCs) Titanium carbide Fe matrix composite Infiltration Molybdenum Interfacial property

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7-2: Truly Bi-stable Ferroelectric Liquid Crystal Based Modulators

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SID Symposium Digest of Technical Papers 2024年第1期55卷 49-52页

作者： Vigneshwaran Swaminathan Valerii Vashchenko Olena Vashchenko Debjyoti Bhadra Chris Mathew Hoi-sing Kwok Abhishek. K. Srivastava State Key Laboratory of Advanced Displays and Optoelectronics Technologies and Center for Display Research Department of Electronics and Computer Engineering Hong Kong University of Science and Technology Clear Water Bay Road Kowloon Hong Kong

We developed a novel method for achieving long-term (>24 hours) true bi-stability in helix-free Ferroelectric Liquid Crystals (FLCs). Instead of employing asymmetric boundary conditions, traditionally used for achieving bi-stability, we utilized symmetric boundary conditions and carefully optimized the anchoring conditions on both the top and bottom substrates using the photoalignment technology. The key to the newly observed long term bi-stability is the twisted alignment structure. Surface roughness was found to play a crucial role in achieving sustained bi-stability. This breakthrough holds promise for developing truly bi-stable, fast modulators for photonic applications.

关键词： Bi-Stability Faster response time High efficiency High Contrast Modulators Memory effect photoalignment Novel Ferroelectric Liquid Crystals

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层状Ti-Ta二元金属-金属复合材料的疲劳性能研究

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Journal of Central South University 2023年第9期30卷 2878-2889页

作者：徐圣航韩梦沈凯杰曹远奎付遨丁超汤慧萍 Advanced Materials Additive Manufacturing Innovation Research Center Hangzhou City UniversityHangzhou 310015China College of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

二元金属复合材料在航空航天、高端装备等领域具有广阔的应用前景。金属-金属之间的界面通常会对疲劳裂纹的萌生和传播产生影响,但目前关于层状金属-金属复合材料的疲劳性能的研究较为有限。本文通过粉末冶金方法制备一种Ti-Ta金属-金... 详细信息

二元金属复合材料在航空航天、高端装备等领域具有广阔的应用前景。金属-金属之间的界面通常会对疲劳裂纹的萌生和传播产生影响,但目前关于层状金属-金属复合材料的疲劳性能的研究较为有限。本文通过粉末冶金方法制备一种Ti-Ta金属-金属层状结构复合材料,并进行热变形处理,系统研究了在不同交变应力下的疲劳寿命和断口形貌。结果表明:Ti-Ta金属-金属层状复合材料的疲劳强度为450 MPa,显著高于纯Ti的。在疲劳断口中,Ta区域呈现出明显的疲劳条纹特征,而Ti区域则在疲劳稳定传播区内呈现解理断裂。此外,Ti和Ta区域之间的界面可以抑制裂纹的扩展,并改变裂纹扩展的方向。由于裂纹传播的方向不断变化,疲劳断口表面呈现出一种“阶梯状”的微观结构。本研究为层状金属-金属复合材料的疲劳裂纹扩展提供了一种新的模型。

关键词：金属-金属复合材料 Ti-Ta合金粉末冶金疲劳性能寿命预测显微组织

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Flexible bioelectronic innovation for personalized health management

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Cancer Innovation 2023年第3期2卷 167-171页

作者： Maowen Xie Guang Yao Yuan Lin School of Materials and Energy University of Electronic Science and Technology of ChinaChengduSichuanChina State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengduSichuanChina Medico-Engineering Cooperation on Applied Medicine Research Center University of Electronic Science and Technology of ChinaChengduSichuanChina Shenzhen Institute for Advanced Study University of Electronic Science and Technology of ChinaShenzhenGuangdongChina

1|INTRODUCTION With the rapid developments in intelligent medical care and interdisciplinary science,innovative flexible bioelectronics(FBEs)are emerging for monitoring health,diagnosing and treating diseases,and even... 详细信息

关键词： bioelectronics flexible innovation

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Classification Models and Variable Selection for SME Credit Risk Assessment in Balance the Data Set 10

Classification Models and Variable Selection for SME Credit ...

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10th International Conference on Digital Arts, Media and technology and 8th ECTI Northern Section Conference on Electrical, Electronics, Computer and Telecommunications Engineering, ECTI DAMT and NCON 2025

作者： Intharasompong, Sornthun Jitpattanakul, Anuchit Mekruksavanich, Sakorn Wongwiwat, Piyada Phaphan, Wikanda King Mongkut's University of Technology North Bangkok Faculty of Applied Science Department of Applied Statistics Bangkok10800 Thailand King Mongkut's University of Technology North Bangkok Faculty of Applied Science Department of Mathematics Bangkok10800 Thailand Intelligent and Nonlinear Dynamic Innovations Research Center Thailand University of Phayao School of Information and Communication Department of Computer Engineering 56000 Thailand Suansunandha Rajabhat University Faculty of Science and Technology Bangkok10800 Thailand Research Group in Statistical Learning and Inference Thailand

ISBN: (纸本)9798331543273

Small and medium-sized enterprises (SMEs) are frequently considered high credit risk, making it difficult to obtain loans from banks. A viable substitute for assessing borrower creditworthiness more impartially is using machine learning-based credit risk assessment (CRA) algorithms. This study evaluated the performance of five machine learning techniques: decision tree, support vector machine, gradient boosting, K-nearest neighbor, and Naïve Bayes. We evaluated each model with K-fold cross-validation and utilized the Stepwise selection method for the variable selection. To address the underlying data imbalance, we balanced the dataset with the SMOTE technique, which showed that normal loans were more widespread than Non-Performing Loans (NPLs). After balancing the data, the Gradient Boosting model displayed the best accuracy, F-measure, and robustness without variable selection, making it the most effective model for predicting SME loans. © 2025 IEEE.

关键词： Risk assessment

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Nutritional properties of Europen eel(Anguilla anguilla)bone peptide-calcium and its apoptosis effect on Caco-2 cells

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Food science and Human Wellness 2022年第6期11卷 1482-1490页

作者： Hui Teng Yuewei Qian Xiaoyun Fan Hui Cao Yuting Tian Lei Chen Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety Guangdong Province Engineering Laboratory for Marine Biological ProductsGuangdong Provincial Engineering Technology Research Center of SeafoodKey Laboratory of Advanced Processing of Aquatic Product of Guangdong Higher Education InstitutionCollege of Food Science and TechnologyGuangdong Ocean UniversityZhanjiang 524088China College of Food Science Fujian Agriculture and Forestry UniversityFuzhou 350002China

The present study aimed at making a rational usage for European eel bone by-products by preparing Europen eel bone peptide chelated calcium(EBPC-Ca).Nutritional properties and bioactivity of EBPC-Ca were *** showed that nutritional properties of calcium ions will cause intra-and inter-molecular folding and aggregation of peptide to uniformly form EBPC-Ca *** chelated compound of EBPC and calcium ion triggered a strong apoptosis in heterogeneous human epithelial colorectal adenocarcinoma(Caco-2)in concentration-and time-dependent *** blot analysis revealed that the EBPC-Ca induced apoptosis may be the result of a blocked autophagy flux through mitochondrial-dependent ***,the increase in FGF-23 protein expression inhibited the absorption of calcium ions and alleviated cell *** was also found that the cell apoptosis occurs with significant increases in the levels of reactive oxygen species(ROS)and Ca^(2+)in the cells,indicating the anti-tumor potential of EBPC-Ca may involve multiple channels.

关键词： Europen eel bone Peptide Calcium Nutritional properties Caco-2 Apoptosis

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Corrigendum to“Bi-continuous Mg-Ti interpenetrating-phase composite as a partially degradable and bioactive implant material”[Journal of Materials science&technology 146(2023)211-220]

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Journal of Materials science & technology 2024年第3期170卷 255-257页

作者： Chenxi Dou Mingyang Zhang Dechun Ren Haibin Ji Zhe Yi Shaogang Wang Zengqian Liu Qiang Wang Yufeng Zheng Zhefeng Zhang Rui Yang Liaoning Provincial Key Laboratory of Oral Diseases School and Hospital of StomatologyChina Medical UniversityShenyang 110001China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China School of Materials Science and Engineering Peking UniversityBeijing 100871China Center for Adaptive System Engineering School of Creativity and ArtShanghaiTech UniversityShanghai 201210China

The authors are very sorry for their carelessness that there are some problems with Fig.3 in the original manuscript.

关键词： composite phase partially

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