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Research 2024年第2期2023卷 691-702页

作者： Zhongjie Li Chao Yang Qin Zhang geng chen Jingyuan Xu Yan Peng Hengyu Guo School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444P.R.China Institute of Artificial Intelligence Shanghai UniversityShanghai 200444P.R.China National Engineering Research Center of Turbo-Generator Vibration School of Energy and EnvironmentSoutheast UniversityNanjing 210096P.R.China institute of Microstructure Technology Karlsruhe Institute of TechnologyKarlsruhe 76344Germany Shanghai Artificial Intelligence Laboratory Shanghai 200444P.R.China Department of Applied Physics Chongqing UniversityChongqing 400044P.R.China

The influence of a mechanical structure's volume increment on the volume power density (VPD) of triboelectric nanogenerators (TENGs) is often neglected when considering surface charge density and surface power density. This paper aims to address this gap by introducing a standardized VPD metric for a more comprehensive evaluation of TENG performance. The study specifically focuses on 2 frequency-up mechanisms, namely, the integration of planetary gears (PG-TENG) and the implementation of a double-cantilever structure (DC-TENG), to investigate their impact on VPD. The study reveals that the PG-TENG achieves the highest volume average power density, measuring at 0.92 W/m^(3). This value surpasses the DC-TENG by 1.26 times and the counterpart TENG by a magnitude of 69.9 times. Additionally, the PG-TENG demonstrates superior average power output. These findings introduce a new approach for enhancing TENGs by incorporating frequency-up mechanisms, and highlight the importance of VPD as a key performance metric for evaluating TENGs.

关键词： increment neglected considering

Investigation on cavitating turbulent flow for the twisted NACA66 hydrofoil using a PANS model with helicity modification

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Journal of Hydrodynamics 2024年第2期36卷 219-231页

作者： chen geng Zhao-hui Qian Ke-xin Zheng Wei-xiang Ye Xian-wu Luo State Key Laboratory of Hydroscience cand Engineering Deparment of Energy and Power EngineeringTsinghua UniversityBeijing 100084China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China

In the present paper,the unsteady cavitating turbulent flow over the twisted NACA66 hydrofoil is investigated based on an modified shear stress transfer k-ωpartially averaged Navier-Stokes(MSST PANS)model,i.e.,new MSST PANS(NMSST PANS)model,where the production term of kinetic energy in the turbulence model is modified with *** with the experimental data,cavitation evolution and its characteristic frequency are satisfactorily predicted by the proposed NMSST PANS *** is revealed that the interaction among the main flow,the reentrant jets,and sheet cavitation causes the formation of the primary shedding cavity near the mid-span and the secondary shedding cavity at each side of the twisted hydrofoil,and further induces the remarkable pressure gradient around shedding *** with the development of the primary and the secondary shedding cavities,the great pressure gradient associated with large cavity volume variation promotes the vortical flow generation and the spatial deformation of vortex structure during cavitation evolution,and results in the primary and the secondary U-type ***,dynamic mode decomposition(DMD)analysis is utilized to confirm the interaction among the main flow,the main reentrant jet and two side reentrant jets,and *** results indicate that the proposed NMSST PANS model is suitable to simulate the complicated cavitating turbulent flow for various engineering applications.

关键词： Cavitating turbulent flow partially averaged Navier-Stokes(PANS)model hydrofoil numerical simulation

Charge Accumulation Characteristics of SF6-Epoxy Interface Under Negative Repetitive Nanosecond Pulses

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CSEE Journal of Power and Energy Systems 2024年第4期10卷 1808-1815页

作者： Shaocong Wu geng chen Yuming Shao Hao Xu Xuanning Zhang Yanyu Liang Youping Tu State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources and the Beijing Key Laboratory of High Voltage and EMC North China Electric Power UniversityBeijing 102206China

Repetitve nanosecond impulses in gas-insulated metal-enclosed switchgear (GIS) are likely to trigger inside flashover. Interface charges on the spacer in GIS are considered one of the main factors damaging insulation performance and may be induced by overvoltage. For good understanding of insulation failures, accumulation characteristics of charges between SF6 and epoxy spacers under repetitive nanosecond impulses are investigated. It can be found under nanosecond impulses, the charge source in gas volume contributes to interface charge accumulation predominantly. Interface charges will be promoted by impulse number and amplitude. Accumulation processes are analyzed based on runaway electrons mechanism. When impulse amplitude exceeds a threshold value, discharge in the gas volume turns to a runaway mode. A runaway electron leads to the interface charge accumulation. Affected by motion of the runaway electrons, the potential peak gradually moves close to the grounded electrode when impulse amplitude is raised. Meanwhile, increasing impulse number can enhance surface potential. Surface potential will reach saturation eventually. However, memory effect of the repetitive impulse discharge makes the half-peak width of the surface potential at the interface change little. Design of GIS gas-solid insulations can refer to this research.

关键词： GIS interface charge repetitive nano-second pulse SF6

Intelligent overheating fault diagnosis for overhead transmission line using semantic segmentation

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High Voltage 2024年第2期9卷 309-318页

作者： Xiangyu Yang Youping Tu Zhikang Yuan Zhong Zheng geng chen Cong Wang Yan Xu Beijing Key Laboratory of High Voltage and EMC North China Electric Power UniversityBeijingChina College of Electronic and Information Engineering Tongji UniversityShanghaiChina

The strain clamps and leading wires are important components that connect conductors on overhead transmission lines and conduct *** operation,poor contact between these components can cause abnormal overheating,leading to electric failures and threatening power system ***,the use of unmanned aerial vehicles equipped with infrared thermal imagers for strain clamp and leading wire maintenance has become increasingly *** learning-based image recognition shows promising prospects for intelligent fault diagnosis of overheating faults.A pre-treatment method is proposed based on dynamic histogram equalisation to enhance the contrast of infrared *** DeepLab v3+network,loss function,and existing networks with different backbones are *** DeepLab v3+network with ResNet101 and convolutional block attention module added,and the Focal Loss function achieved the highest performance with an average pixel accuracy of 0.614,an average intersection over union(AIoU)of 0.567,an F1 score of 0.644,and a frequency weighted intersection over union of 0.594 on the test *** optimised Atrous rates has increased the AIoU by 12.91%.Moreover,an intelligent diagnosis scheme for evaluating the defect state of the strain clamps and leading wires is proposed and which achieves a diagnostic accuracy of 91.0%.

关键词： union fault diagnosis

Berberine Enhances Intestinal Mucosal Barrier Function by Promoting Vitamin D Receptor Activity

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Chinese Journal of Integrative Medicine 2024年第2期30卷 143-151页

作者： HUANG Yong-quan LIU Jia-lin chen geng-xin SHEN Dan-ting ZHU Wang chen Xin-lin LIU Feng-bin HOU Qiu-ke Graduate School Guangzhou University of Chinese MedicineGuangzhou(510405)China Department of Orthopedics the Second Affiliated Hospital of Guangzhou University of Chinese MedicineGuangzhou(510006)China Department of Preventive Medicine and Health Statistics Guangzhou University of Chinese MedicineGuangzhou(510006)China Department of Gastroenterology the First Affiliated Hospital of Guangzhou University of Chinese MedicineGuangzhou(510405)China

Objective:To evaluate if berberine can act on vitamin D receptors(VDR)and thereby regulate the expression of tight junction proteins(TJPs)in irritable bowel syndrome-diarrhea-predominant(IBS-D)***:The newborn rats were induced into IBS-D rat model via neonatal maternal separation combined with acetic acid chemical *** modeling,the model was evaluated and rats were divided into the control group and berberine treatment groups(0.85,1.7 and 3.4 mg/kg,once a day for 2 weeks).The distal colon was obtained and colonic epithelial cells(CECs)were isolated and cultured after IBS-D model *** vitamin D receptor response element(VDRE)reporter gene was determined in the CECs of IBS-D rats to analyze the effect of berberine on the VDRE *** overexpression or silencing technology was used to analyze whether VDR plays a role in promoting intestinal barrier repair,and to determine which region of VDR plays a role in berberine-regulated intestinal ***:The IBS-D rat model was successfully constructed and the symptoms were improved by berberine in a dose-dependent manner(P<0.05).The activity of VDRE promoter was also effectively promoted by berberine(P<0.05).Berberine increased the expression of TJPs in IBS-D CECs(P<0.05).VDR expression was significantly increased after transfection of different domains of VDR when compared to normal control and basic plasmid groups(all P<0.05).RT-qPCR and Western blot results showed that compared with the blank group,expressions of occludin and zonula occludens-1 were significantly higher in VDR containing groups(all P<0.05).Berberine plus pCMV-Myc-VDR-N group exerted the highest expression levels of occludin and zonula occludens-1(P<0.05).Conclusion:Berberine enhances intestinal mucosal barrier function of IBS-D rats by promoting VDR activity,and the main site of action is the N-terminal region of VDR.

关键词： berberine Chinese medicine irritable bowel syndrome-diarrhea-predominant vitamin D receptors intestinal mucosal barrier tight junction proteins

农村公共阅读空间的弱化特征及优化策略——基于中部3省27个行政村的田野调查

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中国图书馆学报 2024年第4期050卷 100-115页

作者：陈庚周若依武汉大学国家文化发展研究院

农村公共阅读空间构建是推动农村阅读服务转型和乡村文化振兴的重要路径。本文采用田野调查及扎根理论研究方法，从空间视角阐释农村阅读服务问题，凝练出“空间生产—空间参与—空间获得”三维研究框架。研究发现农村公共阅读空间呈弱... 详细信息

农村公共阅读空间构建是推动农村阅读服务转型和乡村文化振兴的重要路径。本文采用田野调查及扎根理论研究方法，从空间视角阐释农村阅读服务问题，凝练出“空间生产—空间参与—空间获得”三维研究框架。研究发现农村公共阅读空间呈弱化特征。在空间生产维度上，物理资源基本齐备，制度和文化生产相对式微；在空间参与维度上，农村居民阅读参与的能力、意愿和实践“三低”,主体能动性不强；在空间获得维度上，低质的功能体验、浅层的价值获得和阅读身份认同不足并存。这些特征由体制性、技术性、社会性和主体性等因素引致，需因应施策。农村公共阅读空间的优化，应以需求为本位调整空间生产逻辑，以效用拓展为目标实现空间功能复合化和布局网络化，以地方特色资源为基础形构内嵌式空间结构，以数字技术变迁为引领构建虚拟阅读空间，以内生需求激发为旨归促进村民文化资本积累。表3。参考文献43。

关键词：农村公共阅读空间农家书屋阅读服务乡村文化振兴

农村公共阅读空间的效用评价及其优化策略——基于562位村民的调查分析

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图书馆学研究 2024年第5期 118-127页

作者：陈庚陈媛武汉大学国家文化发展研究院

农村公共阅读空间建设是推动公共文化服务高质量发展、推进乡村文化振兴的重要内容。在借鉴公共阅读空间相关研究的基础上,基于对562位村民的实践调研数据,探究我国农村公共阅读空间的效用评价和优化策略。研究发现:我国农村公共阅读空... 详细信息

农村公共阅读空间建设是推动公共文化服务高质量发展、推进乡村文化振兴的重要内容。在借鉴公共阅读空间相关研究的基础上,基于对562位村民的实践调研数据,探究我国农村公共阅读空间的效用评价和优化策略。研究发现:我国农村公共阅读空间效用评价维度可分为制度空间、知识空间、社交与休闲空间;村民对于制度空间最为满意,知识空间次之,社交与休闲空间位居最后;各效用评价维度的次维度之间亦表现出差异。建议通过激发农村本土活力以优化制度空间,强化数字服务以赋能知识空间,加快资源整合以强化社交与休闲空间。

关键词：农村公共阅读空间效用评价公共文化服务农家书屋

博物馆文创产品消费获得感及其影响因素研究——以湖北省博物馆和武汉博物馆为例

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东南文化 2024年第1期 179-189页

作者：陈庚李晨鹭武汉大学国家文化发展研究院湖北武汉430072

博物馆文创产品消费是当下博物馆功能价值延展的重要路径。博物馆文创产品消费的获得感是评价博物馆文创产品消费效用的根本标尺,可包含认知、情感、社会和功能四个维度。对湖北省博物馆和武汉博物馆观众的实证研究显示,博物馆文创产品... 详细信息

博物馆文创产品消费是当下博物馆功能价值延展的重要路径。博物馆文创产品消费的获得感是评价博物馆文创产品消费效用的根本标尺,可包含认知、情感、社会和功能四个维度。对湖北省博物馆和武汉博物馆观众的实证研究显示,博物馆文创产品消费的获得感整体处于中等偏上水平,认知与情感获得相对较优,社会和功能获得次之。年龄、职业、文创产品消费计划性、文创产品消费频率、文创产品消费占文娱消费的比重、文创产品消费的时间精力投入均与获得感存在显著相关性,其中文创产品消费计划性、文创产品消费频率对获得感有显著的正向影响,年龄对获得感有显著的负向影响。对当前文创产品消费获得感的测量和影响因素分析,可为促进博物馆文创产品消费和提升消费获得感提供理论依据。

关键词：博物馆文创产品文创产品消费消费获得感影响因素

Curcumin for gastric cancer:Mechanism prediction via network pharmacology,docking,and in vitro experiments

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World Journal of Gastrointestinal Oncology 2024年第8期16卷 3635-3650页

作者： Peng-Hui Yang Ya-Nan Wei Bi-Juan Xiao Si-Yi Li Xin-Long Li Liang-Jun Yang Hua-Feng Pan geng-Xin chen The Second School of Clinical Medicine Guangzhou University of Chinese MedicineGuangzhou 510006Guangdong ProvinceChina Science and Technology Innovation Center Guangzhou University of Chinese MedicineGuangzhou 510006Guangdong ProvinceChina Department of Traditional Chinese Medicine The People's Hospital of LonghuaShenzhen 518109Guangdong ProvinceChina Department of Gastroenterology Tongde Hospital of Zhejiang ProvinceHangzhou 310012Zhejiang ProvinceChina Centre for Translational Medicine The Second Affiliated Hospital of Guangzhou University of Chinese MedicineGuangzhou 510120Guangdong ProvinceChina

BACKGROUND Curcumin originates from the natural herb turmeric,and its antitumor effects have been known about for a long ***,the mechanism by which curcumin affects gastric cancer(GC)has not been *** To elucidate the potential mechanisms of curcumin in the treatment of *** Network pharmacological approaches were used to perform network analysis of *** first analyzed Lipinski’s Rule of Five for the use of *** latent targets were predicted using the PharmMapper,SwissTargetPrediction and DrugBank network *** disease targets were mined through the GeneCard,OMIM,DrugBank and TTD network ***,GO enrichment,KEGG enrichment,protein-protein interaction(PPI),and overall survival analyses were *** results were further verified through molecular docking,differential expression analysis and cell *** We identified a total of 48 curcumin-related genes with 31 overlapping GC-related *** intersection targets between curcumin and GC have been enriched in 81 GO biological processes and 22 significant *** PPI analysis,6 hub targets were identified,namely,estrogen receptor 1(ESR1),epidermal growth factor receptor(EGFR),cytochrome P450 family 3 subfamily A member 4(CYP3A4),mitogen-activated protein kinase 14(MAPK-14),cytochrome P450 family 1 subfamily A member 2(CYP1A2),and cytochrome p450 family 2 subfamily B member 6(CYP2B6).These factors are correlated with decreased survival rates among patients diagnosed with *** docking analysis further substantiated the strong binding interactions between Curcumin and the hub target *** experimental findings demonstrated that curcumin not only effectively inhibits the growth of BGC-823 cells but also suppresses their *** levels of hub targets CYP3A4,MAPK14,CYP1A2,and CYP2B6 in BGC-823 cells were significantly increased in each dose *** Curcumin can play an anti-GC role through a variety of

关键词： Curcumin Gastric cancer Network pharmacology Molecular docking Survival analysis

基于纹理图像和用户动作信息的纹理触觉再现方法研究

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仪器仪表学报 2024年第4期45卷 145-154页

作者：陈大鹏陈庚刘佳方映平张运杰南京信息工程大学自动化学院南京210044 江苏省智能气象探测机器人工程研究中心南京210044 江苏省大气环境与装备技术协同创新中心南京210044

近年来,对虚拟表面纹理进行工具介导的振动触觉再现已经成为触觉领域的一个研究热点。针对已有的纹理触觉渲染方法还存在适用范围窄、泛化能力弱、交互真实感低等问题,以改进后的MelGAN为基本网络,构建了一种新的纹理触觉渲染模型。该... 详细信息

近年来,对虚拟表面纹理进行工具介导的振动触觉再现已经成为触觉领域的一个研究热点。针对已有的纹理触觉渲染方法还存在适用范围窄、泛化能力弱、交互真实感低等问题,以改进后的MelGAN为基本网络,构建了一种新的纹理触觉渲染模型。该模型以纹理图像和用户的实时动作信息为输入,在能够高保真地生成振动触觉信号的同时,对常见纹理图像拥有更好的泛化能力。此外,设计了一款具有动作信息实时采集和振动触觉表达功能的笔式装置。在采集了数据库之外的真实纹理表面的振动触觉信号后,比较了提出的模型与已有方法在信号生成方面的性能差异。结果表明,模型实现了最低的均方根误差(0.173),验证了其对未建模纹理进行触觉渲染的能力。最后,使用笔式装置进行了两项用户实验。平均6.01的主观相似度评分说明,即使是数据库之外的新纹理,模型也能为用户提供较高的纹理交互真实感。

关键词：纹理触觉渲染深度学习动作信息笔式交互振动触觉反馈