检索结果-南通市图书馆

Peak earthquake response of structures under multi-component excitations

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2007年第4期6卷 357-370页

作者： jianwei Song Zach liang Yi-Lun Chu George C. Lee Department of Civil Structural and Environmental Engineering State University of New York at Buffalo USA

Accurate estimation of the peak seismic responses of structures is important in earthquake resistant design. The internal force distributions and the seismic responses of structures are quite complex, since ground motions are multidirectional. One key issue is the uncertainty of the incident angle between the directions of ground motion and the reference axes of the structure. Different assumed seismic incidences can result in different peak values within the scope of design spectrum analysis for a given structure and earthquake ground motion record combination. Using time history analysis to determine the maximum structural responses excited by a given earthquake record requires repetitive calculations to determine the critical incident angle. This paper presents a transformation approach for relatively accurate and rapid determination of the maximum peak responses of a linear structure subjected to three-dimensional excitations within all possible seismic incident angles. The responses can be deformations, internal forces, strains and so on. An irregular building structure model is established using SAP2000 program. Several typical earthquake records and an artificial white noise are applied to the structure model to illustrate the variation of the maximum structural responses for different incident angles. Numerical results show that for many structural parameters, the variation can be greater than 100%. This method can be directly applied to time history analysis of structures using existing computer software to determine the peak responses without carrying out the analyses for all possible incident angles. It can also be used to verify and/or modify aseismic designs by using response spectrum analysis.

关键词： multi-component ground motion time history analysis peak structural response axis rotation

Investigation of an Intensifying-flux Variable Flux-leakage Interior Permanent Magnet Machine for Wide Speed Range

在线全文

学校读者我要写书评

暂无评论

CES Transactions on Electrical Machines and Systems 2022年第2期6卷 207-215页

作者： Xiping Liu Dabin Liu Siting Zhu jianwei liang School of Electrical Engineering and Automation Jiangxi University of science and technologyGanzhou 34100China

In this paper,a novel intensifying-flux variable flux-leakage interior permanent magnet(IFVF-IPM)machine is proposed,in which flux barriers were designed deliberately between the adjacent poles to obtain intensifying-flux effect and variable flux-leakage *** rotor topology and design principles of the proposed machine are also ***,a multi-objective optimization method is adopted based on the sensitivity analysis,and some design variables of IFVF-IPM machine with strong sensitivity are selected to optimization progress by using the non-dominated sorting genetic algorithm-Ⅱ(NSGA-Ⅱ).Moreover,the electromagnetic characteristics of conventional IPM machine,conventional IFVF-IPM machine(CIFVF-IPM)and the novel IFVF-IPM machine are compared based on the finite element analysis(FEA)method which includes flux linkage,inductances characteristic,torque-speed envelops and power characteristic,as well as evaluation of the risk of irreversible ***,the experiment results show that the IFVF-IPM machine has a better performance in flux weakening capability for wide speed range and a lower risk of irreversible demagnetization,which indicates the validity and feasibility of the proposed machine.

关键词： Interior permanent magnet(IPM)machine Intensifying-flux Variable flux-leakage Electromagnetic performance Demagnetization Finite element analysis(FEA) Wide speed range

Design and Optimization of a Mechanical Variable-Leakage-Flux Interior Permanent Magnet Machine with Auxiliary Rotatable Magnetic Poles

在线全文

学校读者我要写书评

暂无评论

CES Transactions on Electrical Machines and Systems 2021年第1期5卷 21-29页

作者： Tongze Sun Xiping Liu Yongling Zou Chaozhi Huang jianwei liang School of Electrical Engineering and Automation Jiangxi University of Science and technologyGanzhou 34100China

A novel mechanical variable-leakage-flux interior permanent magnet machine(MVLF-IPMM)is proposed for electric vehicles(EVs)in this paper,which employs a mechanical flux-regulating device and auxiliary rotatable magnetic *** magnetic poles acting as the flux adjustors can be rotated by the additional device to vary the leakage flux in magnetic circuit and realize the adjustment of the PM flux *** to the flux-regulating effect,the flux distribution in this machine is complex and ***,the working principle is illustrated in *** obtain the perfect coordination between the dominant magnetic poles and auxiliary magnetic poles,a multi-objective optimization method is presented based on the parameter sensitivity analysis combining with the Coefficient of Prognosis(CoP).Then,some design parameters with strong sensitive are selected by the sensitivity analysis and the initial model of the proposed motor is optimized by utilizing the multi-objective genetic algorithm(MOGA).According to the result of the optimization,the machine performances of the initial and the optimal design under the different flux states are compared and analyzed to verify the validity of the new variable-flux motor and the optimization method.

关键词： Finite element analysis(FEA) flux regulation Interior permanent magnet machine multi-objective optimization sensitivity analysis.

Design and Optimization of Reverse Salient Permanent Magnet Synchronous Motor Based on Controllable Leakage Flux

在线全文

学校读者我要写书评

暂无评论

CES Transactions on Electrical Machines and Systems 2021年第2期5卷 163-173页

作者： Longxin Du Xiping Liu Jiesheng Fu jianwei liang Chaozhi Huang Jiangxi University of Science and Technology Ganzhou 341000China

In this paper,a controllable leakage flux reverse salient permanent magnet synchronous motor(CLF-RSPMSM)is designed,which has the advantages of wide speed range and low irreversible demagnetization ***,the principle of controllable leakage flux and reverse saliency effect is introduced,and the design of the rotor flux barrier is emphatically ***,multiple design variables are stratified by the comprehensive sensitivity method,and the main variables are screened *** the relationship between the main variables and the optimization goal is discussed according to the response surface ***,a sequential nonlinear programming algorithm(SNP)is used to optimize the three optimization objectives ***,the electromagnetic performance of the proposed motor is compared with the initial IPM motor,the mechanical strength of the proposed rotor is analyzed,and the results verify the effectiveness of the design and optimization method of the proposed motor.

关键词： Controllable leakage flux reverse saliency comprehensive sensitivity multi-objective optimization wide speed range

A pilot phase Ⅱ study of neoadjuvant triplet chemotherapy regimen in patients with locally advanced resectable colon cancer

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Cancer Research 2016年第6期28卷 598-605页

作者： Haitao Zhou Yan Song Jun Jiang Haitao Niu Hong Zhao jianwei liang Hao Su Zheng Wang Zhixiang Zhou Jing Huang Department of Colorectal Surgery National Cancer Center/Cancer HospitalChinese Academy of Medical Science&Peking Union Medical CollegeBeijing 100021China Department of Medical Oncology National Cancer Center/Cancer HospitalChinese Academy of Medical Science&Peking Union Medical CollegeBeijing 100021China Department of Imageology National Cancer Center/Cancer HospitalChinese Academy of Medical Science&Peking Union Medical CollegeBeijing 100021China Department of Abdominal Surgery National Cancer Center/Cancer HospitalChinese Academy of Medical Science&Peking Union Medical CollegeBeijing 100021China

Objective： This study aims to investigate the feasibility, safety and efficacy of triplet regimen of neoadjuvant chemotherapy in patients with locally advanced resectable colon ***： Patients with clinical stage IIIb colon cancer received a perioperative triple chemotherapy regimen（oxaliplatin 85 mg/m2 and irinotecan 150 mg/m2, combined with folinic acid 200 mg, 5-fluorouracil 500 mg bolus and then 2,400 mg/m2 by 44 h infusion or capecitabine 1 g/m2 or S-1 40–60 mg b.i.d orally d 1–10, repeated at 2-week intervals） for 4 cycles. Complete mesocolic excision was scheduled 2–6 weeks after completion of neoadjuvant treatment and followed by a further 6 cycles of FOLFOXIRI or XELOX. Primary outcome measures of this stage II trial were feasibility, safety, tolerance and efficacy of neoadjuvant ***： All 23 patients received neoadjuvant chemotherapy and underwent surgery. Twenty-one patients（91.3%） had reductions in tumor volume after neoadjuvant treatment, and 13 patients（56.5%） had grade 3–4toxicity. No patients had severe complications from surgery. Preoperative therapy resulted in significant downstaging of T-stage and N-stage compared with the baseline clinical stage including one pathological complete ***： Neoadjuvant triple chemotherapy has high activity and acceptable toxicity and perioperative morbidity, and is feasible, tolerable and effective for locally advanced resectable colon cancer.

关键词： 5-Fluorouracil colon cancer irinotecan oxaliplatin neoadjuvant chemotherapy

A Cross Attention Transformer-Mixed Feedback Video Recommendation Algorithm Based on DIEN

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2025年第1期82卷 977-996页

作者： jianwei Zhang Zhishang Zhao Zengyu Cai Yuan Feng liang Zhu Yahui Sun College of Software Engineering Zhengzhou University of Light IndustryZhengzhou450000China Faculty of Information Engineering Xuchang Vocational Technical CollegeXuchang461000China College of Computer Science and Technology Zhengzhou University of Light IndustryZhengzhou450000China College of Electronics and Information Zhengzhou University of Light IndustryZhengzhou450000China

The rapid development of short video platforms poses new challenges for traditional recommendation *** systems typically depend on two types of user behavior feedback to construct user interest profiles:explicit feedback(interactive behavior),which significantly influences users’short-term interests,and implicit feedback(viewing time),which substantially affects their long-term ***,the previous model fails to distinguish between these two feedback methods,leading it to predict only the overall preferences of users based on extensive historical behavior ***,it cannot differentiate between users’long-term and shortterm interests,resulting in low accuracy in describing users’interest states and predicting the evolution of their *** paper introduces a video recommendationmodel calledCAT-MFRec(CrossAttention Transformer-Mixed Feedback Recommendation)designed to differentiate between explicit and implicit user feedback within the DIEN(Deep Interest Evolution Network)*** study emphasizes the separate learning of the two types of behavioral feedback,effectively integrating them through the cross-attention ***,it leverages the long sequence dependence capabilities of Transformer technology to accurately construct user interest profiles and predict the evolution of user *** results indicate that CAT-MF Rec significantly outperforms existing recommendation methods across various performance *** advancement offers new theoretical and practical insights for the development of video recommendations,particularly in addressing complex and dynamic user behavior patterns.

关键词： Video recommendation user interest cross-attention transformer

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

极细颗粒黏土渗流特性试验研究

岩石力学与工程学报 2010年第6期29卷 1222-1230页

作者：梁健伟房营光华南理工大学土木与交通学院广东广州510641 华南理工大学亚热带建筑科学国家重点实验室广东广州510641

为深入研究极细颗粒黏土的渗流特性,采用可调节水头高度的常水头渗透试验装置,利用不同离子浓度的孔隙液和蒸馏水,分别对极细颗粒人工土和广州南沙天然软土进行渗透试验。试验结果显现土体渗流的2个重要的特性,一是随着孔隙液离子浓度... 详细信息

为深入研究极细颗粒黏土的渗流特性,采用可调节水头高度的常水头渗透试验装置,利用不同离子浓度的孔隙液和蒸馏水,分别对极细颗粒人工土和广州南沙天然软土进行渗透试验。试验结果显现土体渗流的2个重要的特性,一是随着孔隙液离子浓度的增大,试样的渗透系数随之增加;二是随着水力梯度的降低,对于不同离子浓度的孔隙液情况,试样的渗透系数出现增大或者减小的"异常"现象。试验结果和机制分析认为,土颗粒表面电荷的微电场作用和渗流孔隙的微尺度效应是影响极细颗粒黏土的渗流特性的重要原因,而颗粒比表面积、表面电位、孔隙液离子浓度和孔隙尺度则是改变渗流特性的重要影响参数。对上述2个渗流特性分别采用"微电场效应"和"微尺度效应"作出解释,其中对软土渗流"异常"现象的真实原因仍需要更多的试验和进一步的研究探讨。

关键词：土力学极细颗粒黏土广州南沙天然软土 “异常”渗流特性渗流的微电场效应渗流的微尺度效应等效渗透系数

倾角对含气膜孔镍基单晶试件的蠕变损伤影响的数值模拟（英文）

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2015年第11期44卷 2656-2660页

作者：梁建伟温志勋岳珠峰西北工业大学陕西西安710129

针对含不同倾角气膜孔的镍基单晶试件的蠕变损伤发展进行了数值模拟,研究了倾角对蠕变特性的影响。气膜孔的倾角分别为0°,15°,30°和45°。结果表明,倾角不同,气膜孔周围的分切应力分布也不同。当倾角为0°,15°和30°时,裂纹扩展方... 详细信息

针对含不同倾角气膜孔的镍基单晶试件的蠕变损伤发展进行了数值模拟,研究了倾角对蠕变特性的影响。气膜孔的倾角分别为0°,15°,30°和45°。结果表明,倾角不同,气膜孔周围的分切应力分布也不同。当倾角为0°,15°和30°时,裂纹扩展方向为θ=±54°,而当倾角为45°时,裂纹沿着θ=±46°的方向进行扩展。倾角为30°的试件有最长的失效寿命。在气膜孔周围的高应力区,分切应力、Mises等效应力和沿拉伸方向的应力σ_(11)均出现了应力松弛现象,且随着时间的延长,应力都达到了稳定值。此外,倾角也影响着蠕变损伤的分布,当倾角为0°,15°,30°和45°时,最大损伤点分别出现在与水平方向成0°,0°,13°和26°的位置。

关键词：单晶高温合金气膜孔倾角蠕变损伤

在线全文

学校读者我要写书评

暂无评论

饲料企业产品质量控制探讨

中国饲料 2006年第2期 37-39页

作者：梁建伟广东温氏食品集团

本文从饲料配方设计、原料质量、生产过程、管理制度等方面阐述了饲料企业产品质量控制的关键点。

关键词：饲料企业产品质量控制