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移动荷载作用下悬浮隧道管体TMD减振分析及优化布置

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振动与冲击 2024年第1期43卷 165-171页

作者：杨赢金利成项贻强何余良绍兴文理学院土木工程学院浙江绍兴312000 浙江大学建筑工程学院杭州310058

为减小悬浮隧道管体在移动荷载作用下的动力响应,采用TMD作为振动控制措施并对减振效果进行了分析。将悬浮隧道管体简化为弹性地基梁,采用移动简谐力模拟汽车荷载,通过Morison方程计算管体振动过程中的流体附加惯性效应和阻尼效应,推导... 详细信息

为减小悬浮隧道管体在移动荷载作用下的动力响应,采用TMD作为振动控制措施并对减振效果进行了分析。将悬浮隧道管体简化为弹性地基梁,采用移动简谐力模拟汽车荷载,通过Morison方程计算管体振动过程中的流体附加惯性效应和阻尼效应,推导建立了移动荷载作用下管体-TMD系统振动控制方程组。采用Newmark-β法进行数值求解,分析了TMD对悬浮隧道管体的减振效果。针对悬浮隧道管体振动特征,提出采用分布式TMD的布置形式,并对移动速度、TMD阻尼比的影响进行了讨论。结论表明:TMD对移动简谐荷载作用下的悬浮隧道管体具有显著减振效果,最大位移减振率在50%以上。由于多阶模态参与振动,单一TMD的有效减振范围有限。在保持总质量不变的情况下,采用分布式TMD可以获得较好的整体减振效果。提高TMD质量比和降低移动荷载速度有助于提高TMD的减振效果。增大阻尼比会减弱TMD的效果,应综合考虑减振效果和工作空间的要求确定。

关键词：悬浮隧道(SFT) 移动荷载调谐质量阻尼器(TMD) 动力响应减振

应用型高校拔尖创新人才培养的价值意蕴、现实困境与实践进路

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江苏高教 2024年第9期 80-85页

作者：林于良梅平平苏州科技大学马克思主义学院江苏苏州215009 苏州科技大学学生工作处江苏苏州215009

应用型高校具有与区域社会和产业系统密切相关的显著识别特征,加强应用型高校拔尖创新人才培养,不仅是推进“三位一体”布局的关键举措,也是服务国家战略需求的职责和使命,更是满足学生成长需要的必然选择。然而,应用型高校也面临拔尖... 详细信息

应用型高校具有与区域社会和产业系统密切相关的显著识别特征,加强应用型高校拔尖创新人才培养,不仅是推进“三位一体”布局的关键举措,也是服务国家战略需求的职责和使命,更是满足学生成长需要的必然选择。然而,应用型高校也面临拔尖创新人才培养的政策协调效应不明显、选拔评价效率不高、课程体系交叉融合不够、多方主体参与人才培养的动力不足等发展困境。为此,应用型高校要从加强拔尖创新人才培养的顶层设计、完善拔尖创新人才的选拔培养机制、优化拔尖创新人才培养的课程体系、促进多主体参与拔尖创新人才培养等方面入手,持续提升拔尖创新人才自主培养能力和培养质量,为中国式现代化提供坚实的人才支撑。

关键词：应用型高校拔尖创新人才应用型课程体系选拔培养机制

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基于混合编码的皮肤病变图像分割

传感技术学报 2024年第3期37卷 476-483页

作者：彭静马玉良席旭刚杭州电子科技大学自动化学院浙江杭州310018

皮肤镜图像中的皮肤病变分割是计算机辅助诊断皮肤癌的关键。现有的卷积神经网络(CNNs)通常由于卷积操作的固有限制而忽视全局上下文信息。因此,提出了一种具有Transformer和CNN优点的混合编码器的皮损分割网络。首先,使用极坐标变换对... 详细信息

皮肤镜图像中的皮肤病变分割是计算机辅助诊断皮肤癌的关键。现有的卷积神经网络(CNNs)通常由于卷积操作的固有限制而忽视全局上下文信息。因此,提出了一种具有Transformer和CNN优点的混合编码器的皮损分割网络。首先,使用极坐标变换对原始图像进行预处理。接着利用CNN对不同尺度特征进行预提取,并将其作为Transformer编码器的输入序列,实现对序列数据的全局上下文建模,更好地捕获特征之间的长程依赖关系。最后,在解码器中加入了多级特征融合模块和注意力机制,解码不同尺度和编码块内的分层语义特征。提出的HET-Net网络在ISIC 201.数据集上JSI、DSC和ACC值分别达到了85.09%、91.43%和96.90%,在ISIC 201.+PH2数据集上分别达到了87.44%、93.02%和95.68%。与其他模型相比,所提模型取得了显著的结果,验证了模型的有效性。

关键词：皮损分割 Transformer 混合编码多级特征级联融合

Phase-stable wide-bandgap perovskites enabled by suppressed ion migration

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Journal of Energy Chemistry 2024年第9期96卷 120-128页

作者： Zhiyu Gao Yu Zhu Jingwei Zhu Cong Chen Zongjin Yi Yi Luo yuliang Xu Kai Wu Tianshu Ma Fangfang Cao Zijun Chen Fang Yao Juncheng Wang Wenwu Wang Chuanxiao Xiao Hao Huang Hongxiang Li Qianqian Lin Pei Cheng Changlei Wang Xia Hao Guanggen Zeng Dewei Zhao College of Materials Science and Engineering&Institute of New Energy and Low-Carbon Technology&Engineering Research Center of Alternative Energy Materials and Devices Ministry of EducationSichuan UniversityChengdu 610065SichuanChina School of Optoelectronic Science and Engineering&Collaborative Innovation Center of Suzhou Nano Science and Technology Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province&Key Lab of Modern Optical Technologies of Education Ministry of ChinaSoochow UniversitySuzhou 215006JiangsuChina Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201ZhejiangChina Ningbo New Materials Testing and Evaluation Center Co.Ltd Ningbo 315201ZhejiangChina State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structure&School of Resources Environment and MaterialsGuangxi UniversityNanning 530004GuangxiChina Key Lab of Artificial Micro-and Nano-Structures of Ministry of Education of China School of Physics and TechnologyWuhan UniversityWuhan 430072HubeiChina College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065SichuanChina

Wide-bandgap(>1.7 eV)perovskites suffer from severe light-induced phase segregation due to high bromine content,causing irreversible damage to devices ***,the strategies of suppressing photoinduced phase segregation and related mechanisms have not been fully ***,we report a new passivation agent 4-aminotetrahydrothiopyran hydrochloride(4-ATpHCl)with multifunctional groups for the interface treatment of a 1.77-eV wide-bandgap perovskite film.4-ATpH^(+)impeded halogen ion migration by anchoring on the perovskite surface,leading to the inhibition of phase segregation and thus the passivation of defects,which is ascribed to the interaction of 4-ATpH^(+)with perovskite and the formation of low-dimensional ***,the champion device achieved an efficiency of 1..32%with an open-circuit voltage(V_(OC))of 1.31. V and a fill factor of 83.32%.Moreover,4-ATpHCl modified device exhibited significant improved stability as compared with control *** target device maintained 80%of its initial efficiency after 51. h of maximum power output(MPP)tracking under 1.sun illumination,however,the control device showed a rapid decrease in efficiency after 267 ***,an efficiency of 27.38%of the champion 4-terminal all-perovskite tandem solar cell was achieved by mechanically stacking this wide-bandgap top subcell with a 1.25-eV low-bandgap perovskite bottom subcell.

关键词： Wide-bandgap perovskite Phase segregation lon migration Interface post-treatment All-perovskite tandems

改进YOLOv5s的弱光水下生物目标检测算法

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北京航空航天大学学报 2024年第2期50卷 499-507页

作者：陈宇梁董绍江孙世政闫凯波重庆交通大学机电与车辆工程学院重庆400074

针对水下光学图像目标检测过程中由于水中光线衰弱严重、图像环境复杂和拍摄设备移动等造成的生物识别精度低的问题,提出了基于改进YOLOv5s的弱光水下生物目标实时检测算法YOLOv5s-underwater。针对弱光水下光线衰弱的问题,引入了限制... 详细信息

针对水下光学图像目标检测过程中由于水中光线衰弱严重、图像环境复杂和拍摄设备移动等造成的生物识别精度低的问题,提出了基于改进YOLOv5s的弱光水下生物目标实时检测算法YOLOv5s-underwater。针对弱光水下光线衰弱的问题,引入了限制对比度自适应直方图均衡(CLAHE)算法对输入图像进行预处理,解决了颜色失真和图像毛糙的问题。针对复杂的弱光水下图像环境,提出了快速空间金字塔池化(SPPF)模块,解决了水下物体区分度低和特征损失严重的问题。针对拍摄设备移动带来的场景和形态变化问题,提出了一种基于旋转窗口的Swin-Transformer模块,提高了模型的泛化能力。针对水下小目标,修改了网络模型结构,提高了小目标的检测能力。仿真和实验结果表明:所提算法相较于YOLOv5s检测精度提高30.7%,证明了算法的有效性。

关键词：弱光水下生物目标 YOLOv5s 限制对比度自适应直方图均衡快速空间金字塔池化旋转窗口

Graphene enhances artemisinin production in the traditional medicinal plant Artemisia annua via dynamic physiological processes and miRNA regulation

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Plant Communications 2024年第3期5卷 31-46页

作者： Junfeng Cao Zhiwen Chen Luyao Wang Ning Yan Jialing Lin Lipan Hou Yongyan Zhao Chaochen Huang Tingting Wen Chenyi Li Saeed ur Rahman Zehui Liu Jun Qiao Jianguo Zhao Jie Wang Yannan Shi Wei Qin Tong Si yuliang Wang Kexuan Tang Frontiers Science Center for Transformative Molecules Joint International Research Laboratory of Metabolic and Developmental SciencesPlant Biotechnology Research CenterFudan-SJTU Nottingham Plant Biotechnology R&D CenterSchool of Agriculture and BiologyShanghai Jiao Tong UniversityShanghai 200240China Engineering Research Center of Coal-based Ecological Carbon Sequestration Technology of the Ministry of Education Key Laboratory of Graphene Forestry Application of National Forest and Grass AdministrationShanxi Datong UniversityDatong 037009China National Key Laboratory of Plant Molecular Genetics Institute of Plant Physiology and Ecology/CAS Center for Excellence in Molecular Plant SciencesChinese Academy of SciencesShanghai 200032China Hainan Institute Zhejiang UniversityYongyou Industry ParkYazhou Bay Sci-Tech CitySanya 572000China College of Agriculture and Biotechnology Zhejiang UniversityHangzhou 310058China Shandong Provincial Key Laboratory of Dryland Farming Technology College of AgronomyQingdao Agricultural UniversityQingdao 266109China Institute of Millet Crops Hebei Academy of Agriculture&Forestry Sciences/Hebei Branch of China National Sorghum Improvement CenterShijiazhuang 050035China

We investigated the effects of graphene on the model herb Artemisia annua,which is renowned for produc-ing artemisinin,a widely used pharmacological *** growth and biomass were promoted when *** was cultivated with low concentrations of graphene,an effect which was attributed to a 1.4-fold increase in nitrogen uptake,a 1.%–22%increase in chlorophyllfluorescence,and greater abun-dance of carbon cycling–related *** to 1. or 20 mg/L graphene resulted in a�60%increase in H2O2,and graphene could act as a catalyst accelerator,leading to a 9-fold increase in catalase(CAT)ac-tivity in vitro and thereby maintaining reactive oxygen species(ROS)***,graphene exposure led to an 80%increase in the density of glandular secreting trichomes(GSTs),in which artemisinin is biosynthesized and *** contributed to a 5%increase in artemisinin content inmature ***-estingly,expression of miR828 was reduced by both graphene and H2O2 treatments,resulting in induction of its target gene AaMYB1.,a positive regulator of GST *** molecular and genetic assays showed that graphene-induced H2O2 inhibits micro-RNA(miRNA)biogenesis through Dicers and regulates the miR828–AaMYB1. module,thus affecting GST *** results suggest that graphene may contribute to yield improvement in *** via dynamic physiological processes together with miRNA regulation,and it may thus represent a new cultivation strategy for increasing yield capacity through nanobiotechnology.

关键词： Artemisia annua artemisinin glandular secreting trichomes GSTs miRNA graphene

大型矿用电铲永磁外转子提升系统动力学特性研究

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机电工程 2024年第10期41卷 1824-1832页

作者：王余良吴娟太原理工大学机械与运载工程学院山西太原030024 山西省矿山流体控制工程实验室山西太原030024 矿山流体控制国家地方联合工程实验室山西太原030024

针对传统电铲提升系统存在传动效率低、能量损耗高、维护工作量大等问题,基于永磁外转子滚筒直接驱动提升装置,提出了一种电铲提升设计方案,并对永磁外转子提升系统的动力学特性进行了研究。首先,分析了电铲挖掘轨迹,建立了以时间为历... 详细信息

针对传统电铲提升系统存在传动效率低、能量损耗高、维护工作量大等问题,基于永磁外转子滚筒直接驱动提升装置,提出了一种电铲提升设计方案,并对永磁外转子提升系统的动力学特性进行了研究。首先,分析了电铲挖掘轨迹,建立了以时间为历程的挖掘轨迹函数表达式,确定了齿尖载荷、挖掘体积的计算方法,从而对挖掘过程中铲斗的受力进行了分析;然后,利用SolidWorks建立了电铲三维模型,将其导入SimulationX的CAD模块,建立了电铲多体动力学模型,并加载了外部载荷曲线以模拟铲斗挖掘过程中的受力情况;之后,将电铲多体动力学模型封装成MATLAB子系统,连接到Simulink的永磁外转子滚筒控制模块,采用了比例积分(PI)调节器和永磁同步电机(PMSM)矢量控制方法提高了滚筒的动态性能和抗扰动能力;最后,利用Simulink中的联合仿真模型对电铲挖掘过程进行了仿真分析,得到了提升力、推压力和电机功率等变化曲线。研究结果表明:与传统提升系统相比,永磁外转子滚筒提升系统节能降耗约27%,而电铲挖掘过程整体节能约1.%,并在1.30模拟样机试验台对提升推压力进行了对比验证。永磁外转子滚筒提升方案大大降低了挖掘能耗,为电铲绿色装备转型提供了参考。

关键词：矿用电铲提升设计动力学建模永磁提升系统联合仿真 SimulationX 比例积分调节器永磁同步电机矢量控制方法

A pathological joint-liver axis mediated by matrikine-activated CD4^(+)T cells

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Signal Transduction and Targeted Therapy 2024年第6期9卷 2679-2693页

作者： Junzhi Yi Hui Zhang Fangyuan Bao Zhichu Chen yuliang Zhong Tianning Ye Xuri Chen Jingyi Qian Mengya Tian Min Zhu Zhi Peng Zongyou Pan Jianyou Li Zihao Hu Weiliang Shen Jiaqi Xu Xianzhu Zhang Youzhi Cai Mengjie Wu Hua Liu Jing Zhou Hongwei Ouyang Department of Sports Medicine of the Second Affiliated Hospital and Liangzhu LaboratoryZhejiang University School of MedicineHangzhouChina Dr.Li Dak Sum&Yip Yio Chin Center for Stem Cells and Regenerative Medicine Zhejiang University School of MedicineHangzhouChina Stomatology Hospital School of StomatologyZhejiang University School of MedicineZhejiang Provincial Clinical Research Center for Oral DiseasesHangzhouChina The MOE Key Laboratory of Biosystems Homeostasis&Protection The Key Laboratory of Cancer Molecular Cell Biology of Zhejiang ProvinceLife Sciences InstituteZhejiang UniversityHangzhouChina Department of Orthopedics Huzhou Central HospitalAffiliated Huzhou HospitalZhejiang University School of MedicineHuzhouChina China Orthopedic Regenerative Medicine Group(CORMed) HangzhouChina Department of Orthopedics The First Affiliated HospitalZhejiang University School of MedicineHangzhouChina

The knee joint has long been considered a closed *** pathological effects of joint diseases on distant organs have not been ***,our clinical data showed that post-traumatic joint damage,combined with joint bleeding(hemarthrosis),exhibits a worse liver function compared with healthy *** mouse model,hemarthrosis induces both cartilage degeneration and remote liver ***,we found that hemarthrosis induces the upregulation in ratio and differentiation towards Th1. cells of CD4^(+)T cells in peripheral blood and *** of CD4^(+)T cells reverses hemarthrosis-induced liver *** of cartilage matrix induced by hemarthrosis upregulates serological type Ⅱ collagen(COL Ⅱ),which activates CD4^(+)T *** application of a COL Ⅱ antibody blocks the ***,bulk RNAseq and single-cell qPCR analysis revealed that the cartilage Akt pathway is inhibited by blood ***-articular application of Akt activator blocks the cartilage degeneration and thus protects against the liver impairment in mouse and pig *** together,our study revealed a pathological joint-liver axis mediated by matrikine-activated CD4^(+)T cells,which refreshes the organ-crosstalk axis and provides a new treatment target for hemarthrosis-related disease.

关键词： degeneration damage inhibited

复方中草药提取物改善高脂饮食诱导的小鼠脂代谢紊乱

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饲料工业 2024年第11期45卷 104-111页

作者：刘园金玉良吉林工程职业学院吉林四平136001 四平市第一人民医院吉林四平136000

研究旨在探究复方中草药方剂中的活性成分对高脂饮食小鼠脂代谢的影响。采用水提醇沉的方法提取复方中草药方剂(柴胡、决明子、泽泻、黄芪、姜黄、陈皮)中的活性成分,并将80只小鼠随机分为对照组(CK组)、高脂日粮组(HFD组)、复方中草药... 详细信息

研究旨在探究复方中草药方剂中的活性成分对高脂饮食小鼠脂代谢的影响。采用水提醇沉的方法提取复方中草药方剂(柴胡、决明子、泽泻、黄芪、姜黄、陈皮)中的活性成分,并将80只小鼠随机分为对照组(CK组)、高脂日粮组(HFD组)、复方中草药提取物低剂量组(L-CCME组)、复方中草药提取物高剂量组(H-CCME组)4组,试验为期6周。试验期间每周称重;试验结束时采集血清、肝脏和肠道组织,采用试剂盒检测血清三酰甘油(TG)、总胆固醇(TC)、高密度脂蛋白(HDL-C)、低密度脂蛋白(LDL-C)、白细胞介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)、谷丙转氨酶(ALT)和谷草转氨酶(AST)含量及肠道中IL-6和TNF-α含量;采用荧光定量PCR和蛋白质免疫印迹检测肝脏脂肪酸合成酶(FAS)和肉碱棕榈酰转移酶-I(CPT-I)表达量。结果表明:与CK组相比,HFD组小鼠血清中ALT、AST、TC和TG含量显著升高(P<0.05),表明造模成功。与HFD组相比,H-CCME组小鼠体重显著降低(P<0.05);试验结束时,与HFD组相比,H-CCME组小鼠TC、TG和LDL-C显著降低,HDL-C显著升高(P<0.05);此外,与HFD组相比,H-CCME组小鼠血清和肠道中IL-6和TNF-α水平显著降低(P<0.05),粪便中脂肪含量升高(P<0.05);与HFD组相比,H-CCME组小鼠肝脏中CPT-I mRNA和蛋白表达水平显著升高,FAS mRNA和蛋白表达水平显著降低(P<0.05)。说明复方中草药提取物能够有效治疗因高脂饲喂导致的脂质代谢异常,且最适添加量为400 mg/kg。

关键词：复方中草药提取物高脂饮食小鼠脂代谢活性成分