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基于X65钢的摩擦螺柱焊可行性焊接工艺

上海交通大学学报 2016年第12期50卷 1898-1901页

作者：田路高辉焦向东北京石油化工学院能源工程先进连接技术研究中心北京102617

影响管线钢摩擦螺柱焊焊接性能的主要焊接工艺参数包括主轴转速、进给速度、焊接压力.在参考其他摩擦焊研究方法的基础上,以X65钢为对象,利用实验室现有的摩擦焊设备,进行大量不同工艺参数组合下的焊接试验.通过对焊接接头的宏观形貌、... 详细信息

影响管线钢摩擦螺柱焊焊接性能的主要焊接工艺参数包括主轴转速、进给速度、焊接压力.在参考其他摩擦焊研究方法的基础上,以X65钢为对象,利用实验室现有的摩擦焊设备,进行大量不同工艺参数组合下的焊接试验.通过对焊接接头的宏观形貌、金相、力学等性能的测试分析来评定接头质量,期望得出以X65钢为代表的管线钢摩擦螺柱焊的可行性焊接工艺,为实际生产提供指导.

关键词：摩擦螺柱焊金相分析力学性能

Input-output approach to robust stability and stabilization for uncertain singular systems with time-varying discrete and distributed delays

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第4期9卷 546-551页

作者： hui-jiao WANG An-ke XUE Yun-fei GUO Ren-quan lu Institute of Automation Zhej iang Sci- Tech University Hangzhou 310018 China Institute of Information and Control Hangzhou Dianzi University Hangzhou 310018 China

Based on input-output approach, the robust stability and stabilization problems for uncertain singular systems with time-varying delays are investigated. The parameter uncertainties are assumed to be norm-bounded and the time-varying delays include both discrete delay and distributed delay. By introducing a new input-output model, the time-delay system is embedded in a family of systems with a forward system without time delay and a dynamical feedback uncertainty. A sufficient and necessary condition, which guarantees the system regular, impulse-free and stable for all admissible uncertainties, is obtained. Based on the strict linear matrix inequality, the desired robust state feedback controller is also obtained. Finally, a numerical example is provided to demonstrate the application of the proposed method.

关键词： Robust stability Input-output stability Singular system Time-varying delay Linear matrix inequality (LMI)

Delay-dependent robust control for uncertain discrete singular systems with time-varying delay

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第8期9卷 1034-1042页

作者： hui-jiao WANG Xiao-dong ZHAO An-ke XUE Ren-quan lu Institute of Automation Zhejiang Sci- Tech University Hangzhou 310018 China Institute of Information and Control Hangzhou Dianzi University Hangzhou 310018 China

The design problem of delay-dependent robust control for uncertain discrete singular systems with time-varying delay is addressed in this paper. The uncertainty is assumed to be norm-bounded. By establishing a finite sum inequality based on quadratic terms, a new delay-dependent robust stability condition is derived and expressed in terms of linear matrix inequalities (LMIs). A suitable robust state feedback control law is presented, which guarantees that the resultant closed-loop system is regular, causal and stable for all admissible uncertainties. Numerical examples are given to demonstrate the applicability of the proposed method.

关键词： Uncertain discrete singular system Time-varying delay Robust control Linear matrix inequality (LMI)

Buckling Properties of Water-Drop-Shaped Pressure Hulls with Various Shape Indices Under Hydrostatic External Pressure

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China Ocean Engineering 2024年第1期38卷 1-17页

作者： DING Xiao-de ZHANG Jian WANG Fang jiao hui-feng WANG Ming-lu School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Shanghai Engineering Research Center of Marine Renewable Energy College of Engineering Science and Technol-ogyShanghai Ocean UniversityShanghai 201306China China Ship Scientific Research Center Wuxi 214082China

The water-drop-shaped pressure hull has a good streamline,which has good application prospect in the underwater ***,this study conducted analytical,experimental and numerical investigation of the buckling properties of water-drop-shaped pressure hulls under hydrostatic pressure.A water-drop experiment was conducted to design water-drop-shaped pressure hulls with various shape *** critical loads for the water-drop-shaped pressure hulls were resolved by using Mushtari’s *** numerical simulations including linear buckling analysis and nonlinear buckling analysis including eigenmode imperfections were *** results indicated that the critical loads resolved by Mushtari's formula were in good agreement with the linear buckling loads from the numerical *** formula can be extended to estimate the buckling capacity of water-drop-shaped pressure *** addition,three groups of pressure hulls were fabricated by using stereolithography,a rapid prototyping ***,three groups of the pressure hulls were subjected to ultrasonic measurements,optical scanning,hydrostatic testing and numerical *** experimental results were consistent with the numerical *** results indicate that the sharp end of the water-drop-shaped pressure hulls exhibited instability compared with the blunt *** paper provides a new solution to the limitations of experimental studies on the water-drop-shaped pressure hulls as well as a new configuration and evaluation method for underwater observatories.

关键词： buckling pressure hull water drop underwater observatory

An Artificial Neural Network Model Combined with Dietary Retinol Intake from Different Sources to Predict the Risk of Nonalcoholic Fatty Liver Disease

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Biomedical and Environmental Sciences 2023年第12期36卷 1123-1135页

作者： LIU Can ZHOU Shi hui SU Hong YANG Wen Qin lu jiao School of Public Health Shanxi Medical UniversityTaiyuan 030001ShanxiChina School of Management Shanxi Medical UniversityTaiyuan 030001ShanxiChina Department of Medical Administration Affiliated Qingdao Central Hospital of Qingdao UniversityQingdao 266000ShandongChina Primary Medical Department Affiliated Qingdao Central Hospital of Qingdao UniversityQingdao 266000ShandongChina Digestive Endoscopy Minimally Invasive Surgery Center Shanxi Provincial Cancer HospitalChinese Academy of Medical Sciences Cancer Hospital Shanxi HospitalAffiliated Cancer Hospital of Shanxi Medical UniversityTaiyuan 030013ShanxiChina School of Public Policy and Administration Xi'an Jiaotong UniversityXi'an 710049ShaanxiChina

Objective This study aimed to develop an artificial neural network(ANN) model combined with dietary retinol intake from different sources to predict the risk of non-alcoholic fatty liver disease(NAFLD) in American *** Data from the 2007 to 2014 National Health and Nutrition Examination Survey(NHANES)2007–2014 were analyzed. Eligible subjects(n = 6,613) were randomly divided into a training set(n1 =4,609) and a validation set(n2 = 2,004) at a ratio of 7:3. The training set was used to identify predictors of NAFLD risk using logistic regression analysis. An ANN was established to predict the NAFLD risk using a training set. Receiver operating characteristic(ROC) curve analysis was performed to evaluate the accuracy of the model using the training and validation *** Our study found that the odds ratios(ORs) and 95% confidence intervals(CIs) of NAFLD for the highest quartile of plant-derived dietary retinol intake(i.e., provitamin A carotenoids, such as β-carotene)(OR = 0.75, 95% CI: 0.57 to 0.99) were inversely associated with NAFLD risk, compared to the lowest quartile of intake, after adjusting for potential confounders. The areas under the ROC curves were 0.874 and 0.883 for the training and validation sets, respectively. NAFLD occurs when its incidence probability is greater than *** The ANN model combined with plant-derived dietary retinol intake showed a significant effect on NAFLD. This could be applied to predict NAFLD risk in the American adult population when government departments formulate future health plans.

关键词： NAFLD Plant-derived dietary retinol intake ANN Prediction model NHANES

Tensile deformation behavior and mechanical properties of a bulk cast Al0.9 CoFeNi2 eutectic high-entropy alloy

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Journal of Materials Science & Technology 2021年第2期61卷 119-124页

作者： hui Jiang Dongxu Qiao Wenna jiao Kaiming Han Yiping lu Peter K.Liaw College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Stare Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China Department of Materials Science and Engineering the University of TennesseeKnoxvilleTN37996USA

In this study,a new Al0.9CoFeNi2 eutectic high entropy alloy(EHEA) was designed,and the microstructures as well as the deformation behavior were *** bulk cast Al0.9CoFeNi2 EHEA exhibited an order face-centered cubic FCC(L12) and an order body-centered cubic(B2) dual-phase lamellar eutectic *** volume fractions of FCC(L12) and B2 phases are measured to be 60 % and 40 %,*** combination of the soft and ductile FCC(L12) phase together with the hard B2 phase resulted in superior strength of 1005 MPa and ductility as high as 6.2 % in tension at room *** Al0.9CoFeNi2 EHEA exhibited obvious three-stage work hardening characteristics and high workhardening *** evolving dislocation substructure s during uniaxial tensile deformation found that planar slip dominates in both FCC(L12) and B2 phases,and the FCC(L12) phase is easier to deform than the B2 *** post-deformation transmission electron microscopy revealed that the sub-structural evolution of the FCC(L12) phase is from planar dislocations to bending dislocations,high-density dislocations,dislocation network,and then to dislocation walls,and Taylor lattices,while the sub-structural evolution of the B2 phase is from a very small number of short dislocations to a number of planar ***,obvious ductile fracture in the FCC(L12) phase and a brittle-like fracture in the B2 phase were observed on the fracture surface of the Al0.9CoFeNi2 *** re search results provide some insight into the microstructure-property relationship.

关键词： Eutectic high-entropy alloy Microstructure Mechanical properties Deformation behavior

Effects of cluster land reclamation projects on storm surge injiaojiang Estuary,China

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Water Science and Engineering 2017年第1期10卷 59-69页

作者： Zhi-lin Sun Sen-jun Huang Jian-ge jiao hui Nie Mei lu Ocean College Zhejiang UniversityHangzhou 310058China Science and Technology Department Zhejiang University of Water Resources and Electric PowerHangzhou 310018China Zhejiang Province Ocean and Fisheries Bureau Hangzhou 310007China

Variations in coastline geometry caused by coastal engineering affect tides, storm surges, and storm tides. Three cluster land reclamation projects have been planned for construction in the jiaojiang Estuary during the period from 2011 to 2023. They will cause significant changes in coastline geometry. In this study, a surge-tide coupled model was established based on a three-dimensional finite-volume coastal ocean model （FVCOM）. A series of numerical experiments were carried out to investigate the effects of variations in coastline geometry on tides, storm surges, and storm tides. This model was calibrated using data observed at the Haimen and Ruian gauge stations and then used to reproduce the tides, storm surges, and storm tides in the jiaojiang Estuary caused by Typhoon Winnie in 1997. Results show that the high tide level, peak storm surge, and high storm tide level at the Haimen Gauge Station increased along with the completion of reclamation projects, and the maximum increments caused by the third project were 0.13 m, 0.50 m, and 0.43 m, respectively. The envelopes with maximum storm tide levels of 7.0 m and 8.0 m inside the river mouth appeared to move seaward, with the latter shifting 1.8 km, 3.3 km, and 4.4 km due to the first project, second project, and third project, respectively. The results achieved in this study contribute to reducing the effects of, and preventing storm disasters after the land reclamation in the jiaojiang Estuary.

关键词： Cluster land reclamation Coastline geometry variation Storm surge jiaojiang Estuary Typhoon Winnie

Identification of microRNA-mRNA regulatory networks and pathways related to retinoblastoma across human and mouse

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International Journal of Ophthalmology(English edition) 2020年第4期13卷 535-544页

作者： Rui Tian He Zou lu-Fei Wang Mei-jiao Song lu Liu hui Zhang Department of Ophthalmology the Second Hospital of Jilin UniversityChangchun 130000Jilin ProvinceChina

AIM: To explore the m RNA and pathways related to retinoblastoma(RB) genesis and ***: Microarray datasets GSE29683(human) and GSE29685(mouse) were downloaded from NCBI GEO database. Homologous genes between the two species were identified using WGCNA, followed by protein-protein interaction(PPI) network construction and gene enrichment analysis. Disease-related mi RNAs and pathways were retrieved from mi R2 Disease database and Comparative Toxicogenomics Database(CTD), ***: A total of 352 homologous genes were identified. Two pathways including "cell cycle" and "pathway in cancer" in CTD and enrichment analysis were identified and seven mi RNAs(including hsa-mi R-373, hsa-mi R-34 a, hsami R-129, hsa-mi R-494, hsa-mi R-503, hsa-let-7 and hsami R-518 c) were associated with RB. mi RNAs modulate "cell cycle" and "pathway in cancer" pathways via regulating 13 genes(including CCND1, CDC25 C, E2 F2, CDKN2 D and TGFB2).CONCluSION: These results suggest that these mi RNAs play crucial roles in RB genesis through "cell cycle" and "pathway in cancer" pathways by regulating their targets including CCND1, CDC25 C, E2 F2 and CDKN2 D.

关键词： Kyoto Encyclopedia of Genes and Genomes pathway micro RNA retinoblastoma weighted gene co-expression network analysis

Characterization of creep behavior of TiAl alloy with high Nb content at elevated temperatures

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Rare Metals 2016年第1期35卷 106-112页

作者： Cheng-Li Dong hui-Chen Yu Ze-hui jiao Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Science and Technology on Advanced High Temperature Structural Materials LaboratoryBeijing Institute of Aeronautical Materials Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials

Creep experiments of the TiAl alloy with high Nb content were conducted to consider both the temperature dependence and stress dependence of its creep *** creep curves were characterized by Theta constitutive model,and Newton-Gauss method was applied to obtain the material *** on the rupture strain,the rupture life of the TiAl alloy was able to be predicted by Theta constitutive *** results show that the creep curves of the TiAl alloy contain primary creep,secondary creep and tertiary creep stages,especially for the lower *** rupture life of the TiAl alloy decreases with the increase in either applied stress or *** constitutive model is able to describe the creep deformation of the TiAl alloy accurately,and the predicted life agrees well with the experimental result.

关键词： TiAl alloy Creep Rupture Life prediction Theta constitutive model