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Designing Symmetric Gradient Honeycomb Structures with Carbon‑Coated Iron‑Based Composites for High‑Efficiency Microwave Absorption

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Nano-Micro Letters 2024年第11期16卷 224-241页

作者： yu Zhang Shu‑Hao ya.g yue Xin Bo Cai Peng‑Fei Hu Hai‑ya.g Dai Chen‑Ming Liang yun‑Tong Meng Ji‑Hao Su Xiao‑juan Zhang Min Lu Guang‑Sheng Wang School of Chemistry Beihang UniversityBeijing 100191People’s Republic of China School of Electronics and Information Zhengzhou University of Light IndustryZhengzhou 450002People’s Republic of China School of Chemical Engineering Northeast Electric Power UniversityJilin 132000People’s Republic of China College of Chemistry and materials Engineering Beijing Technology and Business UniversityBeijing 100048People’s Republic of China

The impedance matching of absorbers is a vital factor affecting their microwave absorption(ma)*** this work,we controllably synthesized material of Institute Lavoisier 88C(MIL-88C)with varying aspect ratios(AR)as a precursor by regulating oil bath conditions,followed by one-step thermal decomposition to obtain carbon-coated iron-based *** the precursor MIL-88C(Fe)preparation conditions,such as the molar ratio between metal ions and organic ligands(M/O),oil bath temperature,and oil bath time,influenced the phases,graphitization degree,and AR of the derivatives,enabling low filler loading,achieving well-matched impedance,and ensuring outstanding ma *** MOF-derivatives 2(MD_(2))/polyvinylidene Difluoride(PVDF),MD_(3)/PVDF,and MD4/PVDF absorbers all exhibited excellent ma properties with optimal filler loadings below 20 wt%and as low as 5 wt%.The MD_(2)/PVDF(5 wt%)achieved a maximum effective absorption bandwidth(EAB)of 5.52 GHz(1.90 mm).The MD_(3)/PVDF(10 wt%)possessed a minimum reflection loss(RL_(min))value of−67.4 at 12.56 GHz(2.13 mm).A symmetric gradient honeycomb structure(SGHS)was constructed utilizing the high-frequency structure simulator(HFSS)to further extend the EAB,achieving an EAB of 14.6 GHz and a RL_(min) of−59.0 *** research offers a viable inspiration to creating structures or materials with high-efficiency ma properties.

关键词： MIL-88C(Fe) Fe/Fe_(3)O_(4)/Fe_(3)C@C Controllable preparation Symmetric gradient honeycomb structure Microwave absorbing

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Molecular mechanism of hypoxia and alpha-ketoglutaric acid on collagen expression in scleral fibroblasts

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International Journal of Ophthalmology(English edition) 2024年第10期17卷 1780-1790页

作者： yun Sun Zhuo-Zheng Li Jing ya.g ya.Ru Sha Xin-yu Hou Hong Fu Jia-Yin Li Shu-Chang Bai Yong-Fang Xie Guo-Hui Wang School of Life Science and Technology Shandong Second Medical UniversityWeifang 261053Shandong ProvinceChina

AIM:To investigate the molecular mechanisms underlying the influence of hypoxia and alpha-ketoglutaric acid(α-KG)on scleral collagen ***:Meta-analysis and clinical statistics were used to prove the changes in choroidal thickness(ChT)during *** establishment of a hypoxic myopia model(HYP)for rabbit scleral fibroblasts through hypoxic culture and the effects of hypoxia andα-KG on collagen expression were demonstrated by Sirius red *** analysis was used to verify the genes and pathways that hypoxia andα-KG affect collagen ***,real-time quantitative reverse transcription polymerase chain reaction(RT-qPCR)was used for reverse ***:Meta-analysis results aligned with clinical statistics,revealing a thinning of ChT,leading to scleral *** red staining indicated lower collagen expression in the HYP group and higher collagen expression in the HYP+α-KG group,showed that hypoxia reduced collagen expression in scleral fibroblasts,whileα-KG can elevated collagen expression under HYP *** analysis unveiled the related genes and signaling pathways of hypoxia andα-KG affect scleral collagen expression and the results were verified by ***:The potential molecular mechanisms through which hypoxia andα-KG influencing myopia is unraveled and three novel genes TLCD4,TBC1D4,and EPHX3 are *** findings provide a new perspective on the prevention and treatment of myopia via regulating collagen expression.

关键词： sclera scleral collagen expression hypoxia alpha-ketoglutaric acid myopia

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基于DC-Unet的混凝土桥梁表观裂缝识别方法

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长安大学学报（自然科学版） 2024年第3期44卷 66-75页

作者：马亚飞孙文康何羽王磊长沙理工大学土木工程学院湖南长沙410114

为解决服役混凝土桥梁表观损伤检测存在误检率高、受背景噪声影响大等问题,提出一种基于DC-Unet的表观裂缝识别方法。首先,使用密集残差连接模块(DRCM)替换U-net模型中每次下采样和上采样前以及最后1×1卷积前的卷积操作,增加了模型深度... 详细信息

为解决服役混凝土桥梁表观损伤检测存在误检率高、受背景噪声影响大等问题,提出一种基于DC-Unet的表观裂缝识别方法。首先,使用密集残差连接模块(DRCM)替换U-net模型中每次下采样和上采样前以及最后1×1卷积前的卷积操作,增加了模型深度;其次,在模型第1次上采样前的位置融入空洞空间池化金字塔模块,扩大了模型感受野,提升了模型获取多层次表观裂缝特征的能力;最后,将结合了空间和通道的注意力模块以残差连接的方式融入DRCM结构中,提高了模型对表观裂缝特征区域的关注,使用Labelme软件标注50张3 648像素×2 736像素分辨率的表观裂缝图像,基于窗口滑动算法构建了包含1 347张混凝土表观裂缝图像及标签图像的TimCracks数据集,将提出的表观裂缝识别方法与U-net模型、SegNet模型、U-net++模型、传统OTSU阈值分割算法和基于Canny算子的边缘检测算法进行了比较。结果表明:提出的方法能准确分割识别混凝土桥梁表观裂缝,具有精度高和抗噪性好等优势,在表观裂缝图像背景存在涂层干扰及不光滑褶皱状况下均可有效降低误检率,裂缝识别准确率、交并比和F_(1)-score分别达96.28%、73.80%和84.91%,3个评价指标较U-net模型、SegNet模型、U-net++模型均有提升,与传统裂缝分割算法相比,提出的DC-Unet网络解决了传统方法的误检问题,能将裂缝从涂层背景中有效分割。

关键词：桥梁工程混凝土裂缝 U-net结构密集残差连接空洞空间池化金字塔损伤检测

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航空发动机振动故障模式的量化方法研究

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振动工程学报 2024年第3期37卷 528-538页

作者：马会防陈亚龙虞磊郎欣周怡中国航发商用航空发动机有限责任公司上海200241

为快速、高效地排除复杂系统的振动故障,本文提出了振动故障模式的量化方法,可基于量化结果进行振动故障模式的重点验证。分析了振动故障树的技术特点,指出其不适用于复杂系统的振动故障分析;从故障模式的发生概率、故障模式的可验证性... 详细信息

为快速、高效地排除复杂系统的振动故障,本文提出了振动故障模式的量化方法,可基于量化结果进行振动故障模式的重点验证。分析了振动故障树的技术特点,指出其不适用于复杂系统的振动故障分析;从故障模式的发生概率、故障模式的可验证性等维度对振动故障模式进行量化;结合某航空发动机核心机的振动故障,给出了振动故障模式量化方法的具体应用。实践证明振动故障模式的量化方法是可行、有效的,且具有较高的工程应用价值。

关键词：航空发动机故障模式量化

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Frontiers in high entropy alloys and high entropy functional materials

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Rare Metals 2024年第10期43卷 4639-4776页

作者： Wen-Tao Zhang Wen Huang Fu-Jie yu Qi Zhao Xin-Dong Zhu Tao Feng ya. Jiang Xiao-Ming Li Xue-Fei Miao He Zhu Si Lan Xue-Qian Wang Bao-Long Shen Zhe Jia Feng-Qi Zhang Wei Wang Qi Liu ya.g Ren Xun-Li Wang Xiao-ya.Cui Xiao-ya.g Wang ya.Nan Chen Bing-Bing Fan Meng-Ru Li Qi-Long Gao Jia-Ming Guo Zeng-Bao Jiao Zhi-Min Guo yu-Ping Zhao Qian yu Rui Huang Ling-Kun Zhang Yi-Ping Lu Xu-Bo Li Huai-Jun Lin ya. ma Wei-Ming ya.g Zhi-Hua Shen Hai-ya. He Yong-Gang Sun Yong-Jiang Huang De-Zhuang Wang Qing-Feng Liu Fei-ya.g Wang Hui Liu Hong-Hui Wu Li-Qiang Wang ya.g Lu Nan Wang Tian-Li Wang Wei-Bing Liao Yi-Han Wang yuan Wu yu-Zhen Yin Jie Pan Yi Zhang Qing Wang Jian-ya.g Zhang Tao ya.g ya.ir Sohail Jin-yu Zhang Hua Ji Qiang Li Wei-Di Liu Zhi-Gang Chen Xiong-Jun Liu Wen ma Liang mao Zhen-Duo Wu School of materials Science and Engineering Nanjing University of Science and Technology Jiangsu Key Laboratory for Advanced Metallic materials School of Materials Science and Engineering Southeast University Department of Physics City University of Hong Kong School of materials Science and Engineering Tianjin University School of Physics and Microelectronics Zhengzhou University Department of Mechanical Engineering Research Institute for Advanced Manufacturing The Hong Kong Polytechnic University Center of Electron Microscopy and State Key Laboratory of Silicon materials School of Materials Science and Engineering Zhejiang University Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology Institute of Advanced Wear & Corrosion Resistance and Functional materials Jinan University School of Mechanics and Civil Engineering China University of Mining and Technology School of Physical Sciences Great Bay University School of materials Science andEngineering Harbin Institute of Technology State Key Laboratory of materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Beijing Advanced Innovation Center for materials Genome Engineering Research Institute for Carbon Neutrality University of Science and Technology Beijing Department of Mechanical Engineering The University of Hong Kong School of Computing Macquarie University Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University State Key Laboratory for Advanced Metals and materials University of Science and Technology Beijing State Key Laboratory of materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Institute of materials Shanghai University Department of materials Science and Engineering C

Owing to their exceptional properties, high-entropy alloys(HEAs) and high-entropy materials have emerged as promising research areas and shown diverse applications. Here,the recent advances in the field are comprehensively reviewed,organized into five sections. The first section introduces the background of HEAs, covering their definition, significance,application prospects, basic properties, design principles, and microstructure. The subsequent section focuses on cutting-edge high-entropy structural materials, highlighting developments such as nanostructured alloys, grain boundary engineering,eutectic systems, cryogenic alloys, thin films, micro-nano-lattice structures, additive manufacturing, high entropy metallic glasses, nano-precipitate strengthened alloys, composition modulation, alloy fibers, and refractory systems. In the following section, the emphasis shifts to functional materials, exploring HEAs as catalysts, magneto-caloric materials, corrosion-resistant alloys, radiation-resistant alloys, hydrogen storage systems, and materials for biomedicine. Additionally, the review encompasses functional high-entropy materials outside the realm of alloys, including thermoelectric, quantum dots, nanooxide catalysts, energy storage materials, negative thermal expansion ceramics,and high-entropy wave absorption materials. The paper concludes with an outlook, discussing future directions and potential growth areas in the field. Through this comprehensive review,researchers, engineers, and scientists may gain valuable insights into the recent progress and opportunities for further exploration in the exciting domains of high-entropy alloys and functional materials.

关键词： Cutting-edge structural materials Cutting-edgefunctional materials High entropy alloys

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一种基于生成对抗架构的目标检测增强算法

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计算机学报 2024年第3期47卷 647-661页

作者：张昀黄橙施健张玉瑶黄经纬于舒娟黄丽亚南京邮电大学电子与光学工程学院、柔性电子(未来技术)学院南京210000

目标检测网络的性能往往受制于特征提取网络的深度,而网络参数的大量增加只能带来检测系统性能的少量提升,同时需要引进许多额外的网络细节设计,这些都会导致训练难度的增加.本文提出了一种基于生成对抗训练的目标检测方法,它以减少特... 详细信息

目标检测网络的性能往往受制于特征提取网络的深度,而网络参数的大量增加只能带来检测系统性能的少量提升,同时需要引进许多额外的网络细节设计,这些都会导致训练难度的增加.本文提出了一种基于生成对抗训练的目标检测方法,它以减少特征分布的EM距离(Wasserstein距离)为训练目标.具体来说,我们将检测网络从整个架构中提取出来,并对特征提取网络进行深入的对抗性训练.实验证明,本文提出的架构进一步提高了网络的特征提取能力,并且没有导致参数的增加.在MS COCO 2017数据集上,本文的架构将基于ResNet101的CenterNet网络性能从36.1%maP提高到37.2%maP,将基于Hourglass-104的maP从42.2%提高到43.0%.

关键词：计算机视觉目标检测生成对抗训练特征提取分类预测

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Echocardiographic Measurements in Normal Chinese Adults(EMINCA)II focusing on left ventricular and left atrial size and function by three-dimensional echocardiography

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Frontiers of Medicine 2024年第4期18卷 649-663页

作者： Yingbin Wang yu Zhang Guihua ya. Hong Tang Lixin Chen Lixue Yin Tiangang Zhu Jianjun yuan Wei Han Jun ya.g Xianhong Shu ya.ya.g yulin Wei ya.li Guo Weidong Ren Dongmei Gao Guilin Lu Ji Wu Hongning Yin yuming Mu Jiawei Tian Lijun yuan Xiaojing ma Hongya. Dai yunchuan Ding Mingya. Ding Qing Zhou Hao Wang Di Xu Mei Zhang yun Zhang State Key Laboratory for Innovation and Transformation of Luobing Theory Key Laboratory of Cardiovascular Remodeling and Function ResearchChinese Ministry of EducationChinese National Health Commission and Chinese Academy of Medical SciencesDepartment of CardiologyQilu Hospital of Shandong UniversityJinan250012China Department of Cardiology Qilu Hospital of Shandong University(Qingdao)Qingdao266000China Department of Ultrasonography West China HospitalSichuan UniversityChengdu610041China Department of Ultrasonography Shenzhen People’s Hospital/The Second Clinical Medical College of Jinan UniversityShenzhen518020China Department of Ultrasonography Electronic Science and Technology University of ChinaThe Affiliated Sichuan Provincial People’s HospitalChengdu610072China Department of Cardiology Peking University People’s HospitalBeijing100044China Department of Ultrasonography Henan Provincial People’s HospitalZhengzhou463599China Department of Cardiology The First Affiliated Hospital of Harbin Medical UniversityHarbin150007China Department of Echocardiology The First Affiliated Hospital of China Medical UniversityShenyang110001China Department of Echocardiology Zhongshan HospitalFudan UniversityShanghai200032China Department of Echocardiology Beijing Anzhen HospitalCapital Medical UniversityBeijing100029China Department of Cardiology Sun Yat-sen Memorial HospitalSun Yat-sen UniversityGuangzhou510120China Department of Ultrasonography The Southwest Hospital of AMUChongqing400038China Department of Ultrasonography Shengjing Hospital of China Medical UniversityShenyang110136China Department of Ultrasonography China-Japan Union hospital of Jilin UniversityChangchun130033China Department of Ultrasonography First Affiliated HospitalSchool of MedicineShihezi UniversityShihezi832000China Department of Ultrasonography The First Affiliated Hospital of Guangxi Medical UniversityNanning537406China Department of Echocardiology The Second Hospital of Hebei Medical Uni

Current guidelines encourage large studies in a diverse population to establish normal reference ranges for three-dimensional(3D)echocardiography for different ethnic *** study was designed to establish the normal values of 3D-left ventricular(LV)and left atrial(LA)volume and function in a nationwide,population-based cohort of healthy Han Chinese adults.A total of 1117 healthy volunteers aged 18–89 years were enrolled from 28 collaborating laboratories in *** sets of 3D echocardiographic instruments were used,and full-volume echocardiographic images were recorded and transmitted to a core laboratory for image analysis with a vendor-independent off-line ***,866 volunteers(mean age of 48.4 years,402 men)were qualified for final *** parameters exhibited substantial differences between different sex and age groups,even after indexation by body surface *** normal ranges of 3D-LV and 3D-LA volume and function differed from those recommended by the American Society of Echocardiography and the European Association of Cardiovascular Imaging guidelines,presented by the World Alliance Societies of Echocardiography(WASE)study,and from the 2D values in the EMINCA *** normal reference values of 3D echocardiography-derived LV and LA volume and function were established for the first time in healthy Han Chinese *** ranges of 3D-LV and 3D-LA echocardiographic measurements stratified with sex,age,and race should be recommended for clinical applications.

关键词： three-dimensional echocardiography left ventricle left atrium normal reference values Chinese adults

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胞磷胆碱对脑出血小鼠Keap1/Nrf2/ARE信号通路的影响

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中国临床药理学杂志 2024年第8期40卷 1175-1179页

作者：卢苇尤红张敏何宝峰马瑞高雅雅马鑫宇甘肃中医药大学第一临床医学院甘肃兰州730000 甘肃中医药大学药学院甘肃兰州730000 甘肃省人民医院中法神经康复科甘肃兰州730000

目的基于Kelch样ECH关联蛋白1/核因子E2相关因子2/抗氧化反应元件(Keap1/Nrf2/ARE)信号通路探讨康复训练联合胞磷胆碱对小鼠脑出血模型的神经保护作用及潜在作用机制。方法将C57BL/6雄性小鼠采用随机数字表法分为假手术组(假手术处理... 详细信息

目的基于Kelch样ECH关联蛋白1/核因子E2相关因子2/抗氧化反应元件(Keap1/Nrf2/ARE)信号通路探讨康复训练联合胞磷胆碱对小鼠脑出血模型的神经保护作用及潜在作用机制。方法将C57BL/6雄性小鼠采用随机数字表法分为假手术组(假手术处理)、模型组(用Ⅶ型胶原酶右侧尾壳核脑出血模型)、胞磷胆碱组(模型+胞磷胆碱64 mg·kg^(-1))、康复训练组(康复训练)及联合组(模型+康复训练+胞磷胆碱64 mg·kg^(-1))。观察脑出血小鼠改良神经损害程度评分(mNSS),用比色法检测脑组织丙二醛(MDA)、超氧化物歧化酶(SOD)、过氧化氢酶(CAT)的表达,用蛋白质印迹法和逆转录-定量聚合酶链反应检测脑组织Keap1、Nrf2、血红素氧合酶-1 (HO-1)、醌氧化还原酶1(NQO1)蛋白和mRNA的表达。结果假手术组、模型组、胞磷胆碱组、康复训练组及联合组mNSS评分分别为0、(1.56±0.73)、(1.00±0.00)、(0.78±0.44)和(0.67±0.50)分,MDA水平分别为(6.93±0.92)、(22.97±0.77)、(19.26±1.73)、(13.21±0.78)和(7.25±0.97)nmol·mgprot-1,Keap1蛋白相对表达水平分别为0.79±0.03、1.02±0.04、0.95±0.10、0.90±0.09和0.86±0.05,Nrf2蛋白相对表达水平分别为0.94±0.12、0.71±0.08、0.90±0.07、0.98±0.12和1.33±0.25。模型组上述指标与假手术组比较,在统计学上差异均有统计学意义(P<0.05,P<0.01);胞磷胆碱组、康复训练组上述指标与模型组比较,在统计学上差异均有统计学意义(P<0.05,P<0.01);联合组上述指标与胞磷胆碱组、康复训练组比较,除Keap1蛋白相对表达水平外,在统计学上差异均有统计学意义(均P<0.01)。结论康复训练、胞磷胆碱均可减轻脑出血小鼠的神经功能缺损症状,作用机制可能为激活Keap1/Nrf2/ARE信号通路发挥抗氧化应激作用,且联合使用效果最佳。

关键词：胞磷胆碱 Kelch样ECH关联蛋白1/核因子E2相关因子2/抗氧化反应元件信号通路康复训练神经保护

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政府采购对企业债务风险的影响研究

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财政研究 2024年第3期 111-128,F0003页

作者：于小悦马新啸王竹泉高雅中国海洋大学管理学院中国海洋大学管理学院、中国企业营运资金管理研究中心

在当前我国经济企稳回升的关键阶段,如何精准识别并有效防范企业债务风险已成为国家治理层面的重要话题。本文构建了与宏观杠杆率相适应的微观企业债务风险指标体系,考察政府采购对于企业债务风险的影响。研究发现:政府采购能够显著降... 详细信息

在当前我国经济企稳回升的关键阶段,如何精准识别并有效防范企业债务风险已成为国家治理层面的重要话题。本文构建了与宏观杠杆率相适应的微观企业债务风险指标体系,考察政府采购对于企业债务风险的影响。研究发现:政府采购能够显著降低企业债务风险。机制检验表明,政府采购能够有效提升企业价值创造能力,并通过增加商业信用融资降低企业债务融资依赖,从而降低企业债务风险;异质性检验表明,上述效应在高行政级别的政府客户、异地政府客户和成长期企业样本中更明显。本文对理解政府采购的微观经济社会后果具有参考价值。

关键词：企业债务风险政府采购价值创造能力金融性负债

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核因子E2相关因子2信号通路在病理性瘢痕中作用的研究进展

引用

中华整形外科杂志 2024年第3期40卷 343-348页

作者：龚玲李宇马娟迟宏羽董祥林新疆医科大学第一附属医院整形科乌鲁木齐830011

核因子E2相关因子2(Nrf2)是细胞维持氧化还原稳态的主要调节因子,Nrf2信号通路具有抗炎、抗氧化应激、抗纤维化等作用,在伤口愈合及病理性瘢痕形成及进展中起着重要作用。该文对氧化应激、Nrf2信号通路对病理性瘢痕作用的相关研究进行... 详细信息

核因子E2相关因子2(Nrf2)是细胞维持氧化还原稳态的主要调节因子,Nrf2信号通路具有抗炎、抗氧化应激、抗纤维化等作用,在伤口愈合及病理性瘢痕形成及进展中起着重要作用。该文对氧化应激、Nrf2信号通路对病理性瘢痕作用的相关研究进行了综述,并对Nrf2信号通路、氧化应激和病理性瘢痕之间的相互关系进行了阐述,以为病理性瘢痕的机制研究及临床防治提供新的视角。

关键词：瘢痕,肥大性瘢痕疙瘩核因子E2相关因子2信号通路活性氧病理性瘢痕伤口愈合

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