检索结果-南通市图书馆

A systematic framework of constructing surrogate model for slider track peeling strength prediction

在线全文

学校读者我要写书评

暂无评论

Science China Technological Sciences 2024年第10期67卷 3261-3274页

作者： DONG xingjian CHEN Qian LIU WenBo WANG Dong PENG ZhiKe MENG Guang State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University KEIPER Seating Mechanisms Co. Ltd. Department of Industrial Engineering and Management Shanghai Jiao Tong University

Peeling strength can comprehensively reflect slider track safety and is crucial in car seat safety assessments. Current methods for determining slider peeling strength are primarily physical testing and numerical simulation. However, these methods encounter the potential challenges of high costs and overlong time consumption which have not been adequately addressed. Therefore, the efficient and low-cost surrogate model emerges as a promising solution. Nevertheless, currently used surrogate models suffer from inefficiencies and complexity in data sampling, lack of robustness in local model predictions, and isolation between data sampling and model prediction. To overcome these challenges, this paper aims to set up a systematic framework for slider track peeling strength prediction, including sensitivity analysis, dataset sampling, and model prediction. Specifically, the interpretable linear regression is performed to identify the sensitivity of various geometric variables to peeling strength. Based on the variable sensitivity, a distance metric is constructed to measure the disparity of different variable groups. Then, the sparsity-targeted sampling(STS) is proposed to formulate a representative dataset. Finally, the sequentially selected local weighted linear regression(SLWLR) is designed to achieve accurate track peeling strength prediction. Additionally, a quantitative cost assessment of the supplementary dataset is proposed by utilizing the minimum adjacent sample distance as a mediator. Experimental results validate the efficacy of sequential selection and the weighting mechanism in enhancing localization ***, the proposed SLWLR method surpasses similar approaches and other common surrogate methods in terms of prediction performance and data quantity requirements, achieving an average absolute error of 3.3 kN in the simulated test dataset.

关键词： slider track peeling strength surrogate model sensitivity analysis data sampling local weighted linear regression

Low-frequency bandgap and vibration suppression mechanism of a novel square hierarchical honeycomb metamaterial

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2024年第10期45卷 1841-1856页

作者： xingjian DONG Shuo WANG Anshuai WANG Liang WANG Zhaozhan ZHANG Yuanhao TIE Qingyu LIN Yongtao SUN State Key Laboratory of Mechanical Systems and Vibration Shanghai Jiao Tong UniversityShanghai 200240China Department of Mechanics Tianjin UniversityTianjin 300350China Tianjin Key Laboratory of Nonlinear Dynamics and Control Tianjin UniversityTianjin 300350China School of Mechanical and Automotive Engineering Guangxi University of Science and TechnologyLiuzhou 545006Guangxi Zhuang Autonomous RegionChina

The suppression of low-frequency vibration and noise has always been an important issue in a wide range of engineering *** address this concern,a novel square hierarchical honeycomb metamaterial capable of reducing low-frequency noise has been *** combining Bloch’s theorem with the finite element method,the band structure is *** results indicate that this metamaterial can produce multiple low-frequency bandgaps within 500 Hz,with a bandgap ratio exceeding 50%.The first bandgap spans from 169.57 Hz to 216.42 *** reveal the formation mechanism of the bandgap,a vibrational mode analysis is *** analysis demonstrates that the bandgap is attributed to the suppression of elastic wave propagation by the vibrations of the structure’s two protruding corners and overall expansion ***,detailed parametric analyses are conducted to investigate the effect ofθ,i.e.,the angle between the protruding corner of the structure and the horizontal direction,on the band structures and the total effective bandgap *** is found that reducingθis conducive to obtaining lower frequency *** propagation characteristics of elastic waves in the structure are explored by the group velocity,phase velocity,and wave propagation ***,the transmission characteristics of a finite periodic structure are investigated *** results indicate significant acceleration amplitude attenuation within the bandgap range,confirming the structure’s excellent low-frequency vibration suppression capability.

关键词： wave propagation vibration suppression metamaterial low-frequency bandgap

Development of Spectral Features for Monitoring Rice Bacterial Leaf Blight Disease Using Broad-Band Remote Sensing Systems

在线全文

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2024年第4期93卷 745-762页

作者： Jingcheng Zhang xingjian Zhou Dong Shen Qimeng Yu Lin Yuan Yingying Dong College of Artificial Intelligence Hangzhou Dianzi UniversityHangzhou310018China School of Information Engineering Zhejiang University of Water Resources and Electric PowerHangzhou310018China Key Laboratory of Digital Earth Science Aerospace Information Research InstituteChinese Academy of SciencesBeijing100094China

As an important rice disease, rice bacterial leaf blight (RBLB, caused by the bacterium Xanthomonas oryzae ***), has become widespread in east China in recent years. Significant losses in rice yield occurred as a result ofthe disease’s epidemic, making it imperative to monitor RBLB at a large scale. With the development of remotesensing technology, the broad-band sensors equipped with red-edge channels over multiple spatial resolutionsoffer numerous available data for large-scale monitoring of rice diseases. However, RBLB is characterized by rapiddispersal under suitable conditions, making it difficult to track the disease at a regional scale with a single sensorin practice. Therefore, it is necessary to identify or construct features that are effective across different sensors formonitoring RBLB. To achieve this goal, the spectral response of RBLB was first analyzed based on the canopyhyperspectral data. Using the relative spectral response (RSR) functions of four representative satellite or UAVsensors (i.e., Sentinel-2, GF-6, Planet, and Rededge-M) and the hyperspectral data, the corresponding broad-bandspectral data was simulated. According to a thorough band combination and sensitivity analysis, two novel spectralindices for monitoring RBLB that can be effective across multiple sensors (i.e., RBBRI and RBBDI) weredeveloped. An optimal feature set that includes the two novel indices and a classical vegetation index was *** capability of such a feature set in monitoring RBLB was assessed via FLDA and SVM algorithms. The resultdemonstrated that both constructed novel indices exhibited high sensitivity to the disease across multiple ***, the feature set yielded an overall accuracy above 90% for all sensors, which indicates its cross-sensorgenerality in monitoring RBLB. The outcome of this research permits disease monitoring with different remotesensing data over a large scale.

关键词： Rice bacterial leaf blight analysis of spectral response multispectral data simulation vegetation indices cross-sensor disease monitoring

ORE-BEARING FORMATIONS AND RESOURCES PROSPECTS OF THE PRECAMBRIAN TERRANES IN SOUTH CHINA

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

ORE-BEARING FORMATIONS AND RESOURCES PROSPECTS OF THE PRECAM...

Sema3A secreted by sensory nerve induces bone formation under mechanical loads

International Conference of Mineralization in Precambrian Terranes & Unesco/Iugs Igcp 443 Annual Meeting and Field Correlation 2003

作者： Jurui He, Aiguo Wang, xingjian rui and Chunhai Li Nanjing Institute of Geology and Mineral Resources, Nanjing 210016, P.R. Chian

1 Tectonic background The South China include Yangtze Plate, Cathaysia Plate and Qinzhou-Hangzhou suture zone between *** east area of South China, the Precambrian systems mostly occur in Jiuling and Wuyi Mountain terranes and the Qinzhou and Hangzhou suture *** Yangtse and Cathaysia Plates underwent two tectogeneses at 1.9-1.7 Ga and 1.0 Ga and combined into the South China *** 0.1-0.2 Ga's weathering and

关键词： ORE-BEARING FORMATIONS AND RESOURCES PROSPECTS OF THE PRECAMBRIAN TERRANES IN SOUTH CHINA

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

International Journal of Oral Science 2024年第1期16卷 62-72页

作者： Hongxiang Mei Zhengzheng Li Qinyi Lv xingjian Li Yumeng Wu Qingchen Feng Zhishen Jiang Yimei Zhou Yule Zheng Ziqi Gao Jiawei Zhou Chen Jiang Shishu Huang Juan Li State Key Laboratory of Oral Diseases&National Center for Stomatology&National Clinical Research Center for Oral Diseases&West China Hospital of Stomatology Sichuan UniversityChengduChina Department of Orthopedic Surgery and Orthopedic Research Institute West China HospitalSichuan UniversityChengduChina

Bone formation and deposition are initiated by sensory nerve infiltration in adaptive bone remodeling. Here, we focused on the role of Semaphorin 3A(Sema3A), expressed by sensory nerves, in mechanical loads-induced bone formation and nerve withdrawal using orthodontic tooth movement(OTM) model. Firstly, bone formation was activated after the 3rd day of OTM,coinciding with a decrease in sensory nerves and an increase in pain threshold. Sema3A, rather than nerve growth factor(NGF),highly expressed in both trigeminal ganglion and the axons of periodontal ligament following the 3rd day of OTM. Moreover, in vitro mechanical loads upregulated Sema3A in neurons instead of in human periodontal ligament cells(hPDLCs) within 24 ***, exogenous Sema3A restored the suppressed alveolar bone formation and the osteogenic differentiation of hPDLCs induced by mechanical overload. Mechanistically, Sema3A prevented overstretching of F-actin induced by mechanical overload through ROCK2 pathway, maintaining mitochondrial dynamics as mitochondrial fusion. Therefore, Sema3A exhibits dual therapeutic effects in mechanical loads-induced bone formation, both as a pain-sensitive analgesic and a positive regulator for bone formation.

关键词： Sema3A formation overload

新疆阿尔泰地区原生金矿的预测和普查评价的最佳决策系统

在线全文

学校读者我要写书评

暂无评论

江苏地质 1992年第Z1期 253-257页

作者：芮行健张松林张定源地质矿产部南京地质矿产研究所地质矿产部南京地质矿产研究所南京 210016

矿产地质科研和地质勘查的终极目标是发现当前有工业价值的矿床。如何在一定的时间内,用有限的人力、物力和财力,最有效地利用科学技术的最新成就,实现上述目标,是当前地质矿产部门面临的紧迫课题。其中,研究和推广先进的预测和普查方法... 详细信息

矿产地质科研和地质勘查的终极目标是发现当前有工业价值的矿床。如何在一定的时间内,用有限的人力、物力和财力,最有效地利用科学技术的最新成就,实现上述目标,是当前地质矿产部门面临的紧迫课题。其中,研究和推广先进的预测和普查方法,对于提高地质勘查工作的效果和效益具有重要意义。系统分析是系统论和管理学相互渗透、互相溶合而成的一种崭新的科学决策方法。

关键词：原生金矿预测普查评价系统新疆

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

朱熹《诗》说与《诗序》异同研究之检讨

现代哲学 2024年第3期 134-144页

作者：车行健台湾政治大学中文系中国台湾

朱熹《诗经》论说与汉代毛郑旧说的关系是《诗经》学史中的重大问题,朱熹与《毛诗序》存在重大分歧,由此形成尊《序》用《序》与疑《序》废《序》两种截然不同的把握诗义的进路。然而朱熹对《诗序》的疑废态度自明清以来受到学界的挑战... 详细信息

朱熹《诗经》论说与汉代毛郑旧说的关系是《诗经》学史中的重大问题,朱熹与《毛诗序》存在重大分歧,由此形成尊《序》用《序》与疑《序》废《序》两种截然不同的把握诗义的进路。然而朱熹对《诗序》的疑废态度自明清以来受到学界的挑战质疑,姚际恒更言之凿凿地指控朱熹“从《序》者十之五”。当代学者步武姚氏的足迹,运用更精密严谨的量化统计方法来研治此问题,取得丰硕成果。然而迄今为止,学界的研究结果仍存在极大差异,难以取得一致结论。本文针对当代15位学者的研究成果做全面检讨和反省,除检视其研究程序和评析所得出的结论之外,更聚焦方法的使用,希冀以此做为进一步研究与解决此问题之基础。

关键词：《诗经》《毛诗序》朱熹《诗集传》《诗序辨说》

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

新疆诺尔特地区化探特征及成矿潜力分析

地质论评 2010年第2期56卷 215-223页

作者：董永观芮行健周刚张传林袁旭音丁汝福南京地质矿产研究所南京210016 新疆阿勒泰第四地质大队新疆阿勒泰836500 北京矿产地质研究院北京100012

新疆阿尔泰诺尔特地区经历了前泥盆纪基底陆壳演化期、上叠盆地发育期、上叠盆地的关闭期和造山后期4个阶段;在地质演化过程中伴随着一系列成矿作用。区域化探资料显示,区内下石炭统中—酸性火山岩出露区以Au、Pb、Zn、Cu为特色的化探... 详细信息

新疆阿尔泰诺尔特地区经历了前泥盆纪基底陆壳演化期、上叠盆地发育期、上叠盆地的关闭期和造山后期4个阶段;在地质演化过程中伴随着一系列成矿作用。区域化探资料显示,区内下石炭统中—酸性火山岩出露区以Au、Pb、Zn、Cu为特色的化探综合异常带规模大,强度高,化探异常浓集中心明显,在部分异常区内已经先后发现多处金、铜、多金属矿床、矿点和矿化点。区域构造演化富集了成矿元素,特别是下石炭统红山嘴组火山岩为金、铜、铅、锌矿源层,燕山期岩浆活动对矿源层中的成矿元素进一步富集,并在构造有利部位成矿。本文通过研究区区域成矿条件和区域化探异常特征分析,指出诺尔特地区具有较大的找矿潜力。

关键词：成矿条件区域化探异常成矿潜力诺尔特新疆阿尔泰

在线全文

学校读者我要写书评

暂无评论

基于结构方程模型的共享停车选择行为研究

重庆交通大学学报（自然科学版） 2024年第2期43卷 40-47页

作者：宋睿秦婉嫕施雯薛行健中南林业科技大学物流与交通学院湖南长沙410004 中南林业科技大学风景园林学院湖南长沙410004

共享停车对解决城市交通停车难题有重要意义。为分析城市共享停车用户选择行为的影响因素,构建了基于混合的多项选择模型。该模型上层通过引入感知风险、知识水平和服务质量这3个潜变量扩展了技术接受度模型;利用结构方程模型分析各潜... 详细信息

共享停车对解决城市交通停车难题有重要意义。为分析城市共享停车用户选择行为的影响因素,构建了基于混合的多项选择模型。该模型上层通过引入感知风险、知识水平和服务质量这3个潜变量扩展了技术接受度模型;利用结构方程模型分析各潜变量间的结构关系和路径显著性,验证了模型提出的假设,将上层估计的潜变量和社会属性变量带入下层多项Logit模型并对模型参数进行标定。研究结果显示:停车用户潜变量、个人及家庭属性和停车特征均对用户选择共享停车具有显著性影响;相较路边停车,共享停车无论是服务质量还是安全性均对用户吸引力更大,但是跟专业化运营的公共停车场相比优势不够明显。

关键词：交通运输工程共享停车选择行为多项选择模型结构方程感知风险