检索结果-南通市图书馆

Accelerating spectral digital image correlation computation with Taylor series image reconstruction

Acta Mechanica Sinica 2024年第6期40卷 78-86页

作者： Shihao Han yuming he Yiyu Hu Jian Lei Yongbo Yang Department of Mechanics Huazhong University of Science and TechnologyWuhan430074China Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment Wuhan430074China Wuhan Sinorock Technology Co. LtdWuhan430074China

In this paper,we introduce an accelerating algorithm based on the Taylor series for reconstructing target images in the spectral digital image correlation method(SDIC).The Taylor series image reconstruction method is employed instead of the previous direct Fourier transform(DFT)image reconstruction method,which consumes the majority of the computational time for target image *** partial derivatives in the Taylor series are computed using the fast Fourier transform(FFT)of the entire image,following the principles of Fourier transform *** examine the impact of different orders of Taylor series expansion on accuracy and efficiency,we employ third-and fourth-order Taylor series image reconstruction methods and compare them with the DFT image reconstruction method through simulated *** a result of these enhancements,the computational efficiency using the third-and fourth-order Taylor series improves by factors of 57 and 46,respectively,compared to the previous *** terms of analysis accuracy,within a strain range of 0–0.1 and without the addition of image noise,the accuracy of the proposed method increases with higher expansion orders,surpassing that of the DFT image reconstruction method when the fourth order is ***,when different levels of Gaussian noise are applied to simulated images individually,the accuracy of the third-or fourth-order Taylor series expansion method is superior to that of the DFT reconstruction ***,we present the analyzed experimental results of a silicone rubber plate specimen with bilateral cracks under uniaxial tension.

关键词： Digital image correlation Taylor series expansion Image reconstruction Strain measurement

来源：

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

三峡库区碳酸岩岸坡消落带岩体劣化特性

引用

山地学报 2024年第1期42卷 70-80页

作者：张国栋夏文中何钰铭危灿三峡大学湖北长江三峡滑坡国家野外科学观测研究站湖北省水文地质工程地质勘察院

岸坡消落带是库水位升降形成的干湿交替作用区域。与岸坡其他地段相比，岸坡消落带水岩作用强烈，不断改造库岸的形貌特征，影响岸坡的整体或局部稳定性。消落带岩体劣化研究在劣化特征、劣化分类，以及劣化评价方法、指标研究方面存在... 详细信息

岸坡消落带是库水位升降形成的干湿交替作用区域。与岸坡其他地段相比，岸坡消落带水岩作用强烈，不断改造库岸的形貌特征，影响岸坡的整体或局部稳定性。消落带岩体劣化研究在劣化特征、劣化分类，以及劣化评价方法、指标研究方面存在不足。本文以三峡库区秭归和巴东干(支)流碳酸岩岸坡消落带岩体为研究对象，采取调(勘)查与试验、“比拟法”等综合分析方法，对碳酸岩消落区岩体劣化特征、过程及机制进行了系统研究，得到以下结论。(1)基于岸坡消落区岩体劣化的宏观效应，可划分为4种劣化类型；库水和地下水联动作用影响消落区岩体劣化的范围，沿深度方向呈现逐渐减弱的趋势，根据岩体劣化程度，可划分为3个区。(2)岩体各类结构面劣化最为严重，尤其是裂隙结构面，控制着岩体劣化的主要特征和类型。(3)库水作用方式和水的溶蚀性强弱影响岩体劣化的进展和演化发展模式。(4)根据库水与岸坡地下水联动程度，结合工程应用，提出了碳酸岩岸坡消落带岩体劣化的评价指标和评价方法。研究成果对消落带岩体劣化评价及岸坡稳定性演化评价具有一定的参考意义。

关键词：消落带碳酸岩岸坡水岩作用岩体劣化三峡库区

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

基于数字孪生仿真的半导体可重入混合流水车间联合调度优化研究

引用

机械设计 2024年第6期41卷 102-113页

作者：刘亮贺禹铭姚春琦霍艳芳天津工业大学经济与管理学院天津300387 天津大学管理与经济学部天津300072

在新一代信息技术与高端制造产业加速融合渗透的背景下,文中针对半导体车间订单动态到达、车间生产信息透明度低的问题,提出了一种基于数字孪生仿真的半导体可重入混合流水车间联合调度方法。首先,设计了一种基于AnyLogic的数字孪生仿... 详细信息

在新一代信息技术与高端制造产业加速融合渗透的背景下,文中针对半导体车间订单动态到达、车间生产信息透明度低的问题,提出了一种基于数字孪生仿真的半导体可重入混合流水车间联合调度方法。首先,设计了一种基于AnyLogic的数字孪生仿真架构,并在此基础上构建了高保真数字孪生仿真模型,对多源异构数据虚实交互、多维多尺度孪生模型运行机理进行了深入探讨;其次,综合考虑最大完工时间、碳排放量和AGV利用率建立联合调度模型,提出了一种结合数字孪生的ENSGA-Ⅱ算法进行求解,并将其嵌入AnyLogic孪生模型实现实时调度;最后,基于差异化场景和半导体车间任务实例,验证了所提方法的有效性。

关键词：半导体可重入混合流水车间数字孪生仿真联合调度 AnyLogic

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Second Generation Wavelet Finite Element and Rotor Cracks Quantitative Identification Method

引用

Chinese Journal of Mechanical Engineering 2010年第2期23卷 195-199页

作者： CheN Xuefeng LI Bing he yuming he Zhengjia State Key Laboratory for Manufacturing Systems Engineering Xi ＇an Jiaotong University Xi ＇an 710049 China

The presence of cracks in the rotor is one of the most dangerous and critical defects for rotating machinery. Defect of fatigue cracks may lead to long out-of-service periods, heavy damages of machines and severe economic consequences. With the method of finite element, vibration behavior of cracked rotors and crack detection was received considerable attention in the academic and engineering field. Various researchers studied the response of a cracked rotor and most of them are focused on the crack detection based on vibration behavior of cracked rotors. But it is often difficult to identify the crack parameters quantitatively. Second generation wavelets （SGW） finite element has good ability in modal analysis for singularity problems like a cracked rotor. Based on the fact that the feature of SGW could be designed depending on applications, a multiresolution finite element method is presented. The new model of SGW beam element is constructed. The first three natural frequencies of the rotor with different crack location and size were solved with SGW beam elements, and the database for crack diagnosis is obtained. The first three metrical natural frequencies are employed as inputs of the database and the intersection of the three frequencies contour lines predicted the normalized crack location and size. With the Bently RK4 rotor test rig, rotors with different crack location and size are tested and diagnosed. The experimental results denote the cracks quantitative identification method has higher identification precision. With SGW finite element method, a novel method is presented that has higher precision and faster computing speed to identify the crack location and size.

关键词： second generation wavelet finite element fault diagnosis crack

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparative study on pattern recognition receptors in non-teleost ray-finned fishes and their evolutionary significance in primitive vertebrates

引用

Science China(Life Sciences) 2019年第4期62卷 566-578页

作者： yuming he Hailin Pan Guojie Zhang Shunping he BGI Education Center University of Chinese Academy of Sciences China National Genebank BGI-Shenzhen State Key Laboratory of Genetic Resources and Evolution Kunming Institute of Zoology Chinese Academy of Sciences Centre for Social Evolution Department of Biology Universitetsparken 15 University of Copenhagen Key Laboratory of Aquatic Biodiversity and Conservation of the Chinese Academy of Sciences Institute of Hydrobiology Chinese Academy of Sciences

Pattern recognition receptors(PRRs) play important roles in innate immunity system and trigger the specific pathogen recognition by detecting the pathogen-associated molecular patterns. The main four PRRs components including Toll-like receptors(TLRs), RIG-I-like receptors(RLRs), NOD-like receptors(NLRs) and C-type lectin receptors(CLRs) were surveyed in the five genomes of non-teleost ray-finned fishes(NTR) including bichir(Polypterus senegalus), American paddlefish(Polyodon spathula), alligator gar(Atractosteus spatula), spotted gar(Lepisosteus oculatus) and bowfin(Amia calva), representing all the four major basal groups of ray-finned fishes. The result indicates that all the four PRRs components have been well established in these NTR fishes. In the RLR-MAVS signal pathway, which detects intracellular RNA ligands to induce production of type I interferons(IFNs), the MAVS was lost in bichir particularly. Also, the essential genes of recognition of Lipopolysaccharide(LPS) commonly in mammals like MD2, LY96 and LBP could not be identified in NTR fishes. It is speculated that TLR4 in NTR fishes may act as a cooperator with other PRRs and has a different pathway of recognizing LPS compared with that in mammals. In addition, we provide a survey of NLR and CLR in NTR fishes. The CLRs results suggest that Group V receptors are absent in fishes and Group II and VI receptors are well established in the early vertebrate evolution. Our comprehensive research of PRRs involving NTR fishes provides a new insight into PRR evolution in primitive vertebrate.

关键词： pattern recognition receptors(PRR) Toll-like receptors(TLR) RIG-I-like receptors(RLR) C-type lectin receptors(CLR) NOD-like receptors(NLR) innate immunity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

耦合碳转移及能量共享的多油气站场IES运行优化

引用

重庆理工大学学报（自然科学） 2024年第5期38卷 259-268页

作者：陈杰王玮焦玉博贺禹铭李栋宫敬中国石油大学(北京)机械与储运工程学院北京102249

在能源转型及“碳达峰、碳中和”背景下,构建基于多能互补的综合能源系统(IES)有助于提高油气站场的节能降耗水平。融入站间碳转移及能量共享,考虑能流供需平衡、CCUS-P2G模块及储能装置运行等约束,以运行成本最低为目标,提出一种针对... 详细信息

在能源转型及“碳达峰、碳中和”背景下,构建基于多能互补的综合能源系统(IES)有助于提高油气站场的节能降耗水平。融入站间碳转移及能量共享,考虑能流供需平衡、CCUS-P2G模块及储能装置运行等约束,以运行成本最低为目标,提出一种针对多油气站场IES协同运行的混合整数规划模型,确定各油气站场IES的最优运行方案。以3个油气站场组成的能量系统为研究对象,验证模型的优化性能。结果表明,设备间的相互协调可有效提升系统的能量利用率,消纳自然清洁能源,防止弃光、弃风。此外,相较各油气站场独立运行,多油气站场协同运行能降低11.8%的运行费用。该研究可为油气站场的低碳经济运行提供理论指导。

关键词：油气站场综合能源系统碳转移能量共享优化

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

DEFORMATION MEASUREMENT USING DUAL-FREQUENCY PROJECTION GRATING PHASE-SHIFT PROFILOMETRY

引用

Acta Mechanica Solida Sinica 2008年第2期21卷 110-115页

作者： Yanming Chen yuming he Eryi Hu Hongmao Zhu Department of Mechanics Huazhong University of Science and Technology Wuhan 430074 China

2π phase ambiguity problem is very important in phase measurement when a deformed object has a large out of plane displacement. The dual-frequency projection grating phaseshifting profilometry （PSP） can be used to solve such an issue. In the measurement, two properchosen frequency gratings are utilized to synthesize an equivalent wavelength grating which ensures the computed phase in a principal phase range. Thus, the error caused by the phase unwrapping process with the conventional phase reconstruct algorithm can be eliminated. Finally, experimental result of a specimen with large plastic deformation is given to prove that the proposed method is effective to handle the phase discontinuity.

关键词： dual-frequency phase-shift profilometry projection grating phase unwrapping deformation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A MODIFIED TORSION PENDULUM FOR MEASURING The SheAR MODULUS OF A SINGLE MICRO-SIZED FILAMENT

引用

Acta Mechanica Solida Sinica 2014年第3期27卷 221-233页

作者： Dabiao Liu yuming he Peng Hu Zhipeng Gan Huaming Ding Department of Mechanics Huazhong University of Science and Technology Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment

A modified torsion pendulum apparatus is developed for measuring the shear modu- lus of single filaments with uniform micro-sized diameter. A single filament fixed at both ends and with a ring-shaped mass attached at the middle is used as a clamped-clamped torsion pendulum. The shear modulus of single filaments can be expressed as a function of the oscillation frequency of the torsion pendulum. The oscillation motion is measured with a CCD laser displacement sensor, and its frequency is determined by the Fast Fourier Transform （FFT） method. The shear moduli of three types of filaments： copper wires, tungsten wires and carbon fibers are accurately measured with this technique. It is found that the size effect in shear moduli of both copper wires and tungsten wires is minor. Finally, the error analysis of our measurement technique is presented in detail.

关键词： torsion pendulum shear modulus size effect single filament

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

社区2型糖尿病自我管理行为与家庭功能相关性研究

引用

医学动物防制 2024年第1期40卷 51-55页

作者：麦志华何煜明邓巧妍袁俊王大虎黄志杰广州市番禺区大石街社区卫生服务中心广东广州511430 广州市疾病预防控制中心

目的探索社区2型糖尿病患者的自我管理行为与家庭功能的相关性,为制定家庭干预策略提供依据。方法利用系统抽样法抽取广州市番禺区某社区卫生服务中心2022年1月-2023年1月的2型糖尿病患者,采用糖尿病自我管理行为量表及家庭关怀指数问... 详细信息

目的探索社区2型糖尿病患者的自我管理行为与家庭功能的相关性,为制定家庭干预策略提供依据。方法利用系统抽样法抽取广州市番禺区某社区卫生服务中心2022年1月-2023年1月的2型糖尿病患者,采用糖尿病自我管理行为量表及家庭关怀指数问卷,评价患者的自我管理行为和家庭功能状况,采用t检验和方差分析进行单因素分析,采用Pearson相关进行相关性分析,采用多元线性回归分析探索糖尿病患者自我管理行为的相关影响因素。结果共回收有效问卷420份,有效回收率为91.70%。糖尿病患者自我管理行为总分为(48.55±14.08)分,家庭功能总分为(7.09±0.61)分,自我管理行为总分与家庭功能总分(r=0.237,P=0.023)呈正相关。年龄(β=0.156,t=2.534,P=0.031)、病程(β=1.105,t=6.741,P=0.018)、并发症(β=0.148,t=8.612,P=0.003)、家庭功能(β=0.668,t=2.621,P=0.038)是糖尿病患者自我管理行为的影响因素。结论社区2型糖尿病患者的家庭功能处于良好水平,自我管理行为处于中等水平,良好的家庭功能有助于自我管理行为的养成,在社区2型糖尿病患者的管理过程中增加家庭功能评价及家庭相关的干预措施具有现实意义。

关键词：社区糖尿病自我管理行为家庭功能影响因素相关性分析

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Novel Method for Power Analysis Based on Combinational Logic in Block Cipher Circuit

引用

Chinese Journal of Electronics 2014年第1期23卷 151-156页

作者： GUO Zheng GU Dawu YUAN Kan LIU Junrong he yuming School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai Huahong Integrated Circuit Co. Ltd.

In this paper, we propose a method that builds power model template according to input transitions of combinatorial logic circuit. By computing its correlation with the overall power consumption of a cryptographic circuit, we are able to recover the secret key. Several simulation-based experiments have been conducted,which verifies the feasibility of our method and shows that the combinatorial logic is also faced with the problem of information leakage in power analysis cases. Compared with DPA(Differential power analysis) and CPA(Correlation power analysis), our attack is fairly effective against the cryptographic circuits whose protection is only implemented on the register parts of the sequential circuit. In addition, a few topics for further research, as well as the advices for more precise power model and countermeasures,are presented at the end of the paper.

关键词： Side channel attack Power analysis Combinational logic Cryptographic circuits

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：