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Global trend of review articles focused on cardiopulmonary bypass:Perspectives from bibliometrics

World Journal of Methodology 2025年第2期15卷 166-173页

作者： Lei Deng Rui Zhou Xian-Jie Zhang yan-Hua peng Department of Gastroenterology Deyang People’s HospitalDeyang 618000Sichuan ProvinceChina Department of Anesthesiology and Perioperative Medicine Shanghai Fourth People's HospitalSchool of MedicineTongji UniversityShanghai 200434China Department of Anesthesiology Deyang People’s HospitalDeyang 618000Sichuan ProvinceChina

BACKGROUND Cardiopulmonary bypass(CPB)is a life-support technology widely used in *** articles reflect research advances in a certain topic or field within a certain period of *** To perform a bibliometric analysis of the review articles that focused on CPB for cardiovascular *** This study was based on a bibliometric *** were acquired from the Web of Science and basic bibliometric parameters were analyzed and visualized using VOSviewer and *** We identified 141 review articles on ***,the number of publications increased,and most of them were published in the 2010s(n=57,40.4%)and the 2020s(n=45,31.9%).There were 113(80.1%)narrative review articles,21(14.9%)meta-analysis studies and 7(5.0%)systematic review *** United States(n=25,17.7%)and China(n=21,14.9%)were the leading countries in terms of publication *** articles were published in 98 different *** Journal of Cardiothoracic and Vascular Anesthesia(n=14,10.0%)and Perfusion-United Kingdom(n=11,7.8%)were preferred by the *** high-frequency keywords included inflammatory response,children,acute kidney injury,meta-analysis and off-pump,except for CPB and cardiac *** response had the closest relationship with CPB during cardiac *** complications of CPB,including inflammatory response,kidney injury and ischemia,caught lots of *** The rapid increase of review papers shows that the research on CPB in cardiac surgery is increasingly being emphasized by scholars and clinical staff ***-analysis has been widely conducted to analyze clinical controversies and further guide clinical *** to improving the outcomes of patients undergoing cardiac surgery with CPB are the hot spots in this field.

关键词： Cardiopulmonary bypass Review article Bibliometric analysis Cardiac surgery Hot spots

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Thermal and mechanical behavior of casting copper alloy wheel during wheel and belt continuous casting process

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China Foundry 2024年第1期21卷 82-90页

作者： Kun Gao yan peng School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina

To investigate the thermal and mechanical behavior of casting wheel,a two-dimensional thermoelastic-plastic finite element model was used to predict the temperature,stress and distortion distribution of the casting wheel during the wheel and belt continuous casting *** effects of grinding thickness and casting speed on the thermal and mechanical behaviors of the center of the hot face of the casting wheel were discussed in *** each rotation,the casting wheel passes through four different spray *** results show that the temperature distribution of the casting wheel in different spray zones is similar,the temperature of the hot face is the highest and the temperature reaches the peak in the spray zoneⅢ.The stress and distortion depend on the temperature distribution,and the maximum stress and distortion of the hot face are 358.2 MPa and 1.82 mm,*** temperature at the center of the hot face decreases with increasing grinding thickness and increases with increasing casting speed.

关键词： casting wheel finite element model grinding thickness casting speed hot face spray zones

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Numerical simulation of fluid flow and free surface fluctuations during wheel and belt casting process

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Journal of Iron and Steel Research International 2024年第5期31卷 1117-1126页

作者： Kun Gao yan peng National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao066004HebeiChina

The unstable fluid flow and severe free surface fluctuations in the wheel and belt caster can affect the quality of the cast *** lower level height tends to entrap inclusions in the molten *** the other hand,the higher level height makes the production process more dangerous due to the overflow of high temperature fluid from the mold.A computational model of the molten metal pouring process was *** transient fluid flow and free surface fluctuations behavior were calculated using the three-dimensional large eddy simulation model and the volume of fluid *** results show that the flow velocity of the main jet gradually decreases under the influence of the low kinetic energy fluid in the *** is an obvious oscillation in the tail of the jet,while the flow field is asymmetric in *** jet is closer to the inside radius side due to the Coanda effect,and there is a recirculation zone on the inside radius and the outside radius respectively,according to the 10 s time-averaged *** with the industrial observation and simulation results,the shape of the free surface is a wave that varies with *** addition,the free surface height is lowest and the flow velocity is highest in the region near the jet.

关键词： Fluid flow Free surface Wheel and belt caster Large eddy simulation Volume of fluid method

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SYSTEM FOR TORQUE CONVERTER DESIGN AND ANALYSIS BASED ON CAD/CFD INTEGRATED PLATFORM

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Chinese Journal of Mechanical Engineering 2008年第4期21卷 35-39页

作者： WU Guangqiang yan peng College of Automotive Tongji UniversityShanghai 201804 China

A 3D torque converter design system is developed based on numerical investigation into flow field and CAD technology. The 3D steady-state flow field simulation is undertaken by using time averaged Reynolds equation and k-epsilon turbulence model, with mixing-plane boundary conditions at three section interfaces. The blades are designed according to the flow field characteristics by using a reverse design method in the system. The accurateness of numerical analysis and the validity of design system are verified by the fluid field experiment of desingn example of the torque converter. This kind of design and analysis system for torque converter based on integration of comput ationol fluid dynamics （CFD） and CAD is a powerful tool for torque converter manufacturing, but also a prettg important significance for research and development.

关键词： Torque converter Flow field investigation Secondary flow

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A beam flexure-based nanopositioning stage supporting laser direct-write nanofabrication

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Science China(Physics,Mechanics & Astronomy) 2016年第8期59卷 50-55页

作者： Zhen Zhang peng Wang peng yan YingChun Guan State Key Laboratory of Tribology and Institute of Manufacturing Engineering Department of Mechanical EngineeringTsinghua University Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipments and Control Tsinghua University State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Key Laboratory of High-efficiency and Clean Mechanical Manufacture Ministry of Education School of Mechanical EngineeringShandong University School of Automation Science and Electrical Engineering Beihang University School of Mechanical Engineering and Automation Beihang University

A nanopositioning system of both millimetric stroke and nanometric tracking accuracy is a key component for nanofabrication in many applications. In this paper, a novel bi-axial beam-flexure nano servo stage is proposed to support a direct writing system for femtosecond laser nanofabrication. The important features of the stage lie in: a mirror symmetric instead of rotational symmetric configuration is adopted to restrict cross axis coupling, and a novel Z-shaped guidance module is proposed to achieve relative large linear stiffness range, in addition a redundant constraints module is introduced to increase off-axis stiffness of the stage. Mechanical analysis and system identification are provided, with which a feedback control algorithm demonstrates the tracking capability for laser fabrication purposes. Based on the fabricated XY nano-stage, real time control and measurements are deployed, demonstrating the millimetric operating workspace and 77.8 nm(RMS) error of tracking a circular trajectory.

关键词： laser nanofabrication direct writing servo and control system

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Effect of Deformation on Microstructure and Mechanical Properties of Medium Carbon Steel During Heat Treatment Process

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Chinese Journal of Mechanical Engineering 2021年第5期34卷 296-305页

作者： yan peng Caiyi Liu Ningning Wang National Engineering Research Center for Equipment and Technology of Cold Rolled Strip Yanshan UniversityQinhuangdao 066004China

The current research of the Q-P and Q-P-T process has been focused on controlling the heating temperature and holding time,or adding alloy elements into the steel to induce precipitation strengthening and improve the strength and plasticity of the *** this article,based on a quenching-partitioning-tempering(Q-P-T)process combined with a hot deformation technology,a deforming-quenching-partitioning-tempering(D-Q-P-T)process was applied to medium carbon *** effect of the heat treatment parameters on the microstructure and mechanical properties of experimental steel under deformation was *** use of a scanning electron microscope(SEM),transmission electron microscopy(TEM)and tensile tests,the optimal heat treatment conditions for realizing high strength and plasticity that meet the safety requirements were *** mechanism for the D-Q-P-T process to improve the strength and plasticity of experimental steel was discussed.A multiphase composite structure of lath martensite and retained austenite was *** with the Q-P-T process,use of the D-Q-P-T process can increase the strength of steel by 57.77 MPa and the elongation by 5%.This study proposes a method to improve the strength and plasticity of steel.

关键词： Deforming-quenching-partitioning-tempering Microstructure Mechanical properties Product of strength and ductility(R_(m)×A)

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A Novel Text Retrieval Algorithm for Public Crisis Cases

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Chinese Journal of Electronics 2019年第4期28卷 712-717页

作者： peng yan WANG Jie JIAO Lulin School of Management Capital Normal University

Public crisis has the characteristics of suddenness and uncertainty, and it is necessary to combine the knowledge with the experience of other similar situations to make decisions effectively and *** work combines artificial intelligent theory with information technology and brings case-based reasoning to build models consisting of the features of public crisis. We explore the case-representation approach and build a case-based retrieval algorithm. Combining the specificness of Case-based reasoning(CBR) technology in the monitoring of public crisis events, a new case retrieval algorithm for public crisis cases, named as Combined multi-similarity with set of simi-larity matching algorithm based on sememe(CMSBS), is proposed to analyze the cases with high similarity to current *** CMSBS algorithm considers the structural and semantic similarities between two public crisis cases comprehensively. Simulation experiments are performed to validate the representation method of the knowledge,and the simulation results demonstrate that the CMSBS algorithm has superior performance in the average number of matching cases and matching accuracy rate and can work well in providing reference cases for subsequent events.

关键词： Knowledge representation Case retrieval Public crisis Case-based reasoning

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Coupled Dynamic Modeling of Rolls Model and Metal Model for Four High Mill Based on Strip Crown Control

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Chinese Journal of Mechanical Engineering 2013年第1期26卷 144-150页

作者： SUN Jianliang peng yan LIU Hongmin National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan University State Key Laboratory of Metastable Materials Science & Technology Yanshan University

The crown is a key quality index of strip and plate, the rolling mill system is a complex nonlinear system, the strip qualities are directly affected by the dynamic characteristics of the rolling mil. At present, the studies about the dynamic modeling of the rolling mill system mainly focus on the dynamic simulation for the strip thickness control system, the dynamic characteristics of the strip along the width direction and that of the rolls along axial direction are not considered. In order to study the dynamic changes of strip crown in the roiling process, the dynamic simulation model based on strip crown control is established. The work roll and backup roll are considered as elastic continuous bodies and the work roll and backup roll are joined by a Winkler elastic layer. The rolls are considered as double freely supported beams. The change rate of roll gap is taken into consideration in the metal deformation, based on the principle of dynamic conservation of material flow, the two dimensional dynamic model of metal is established. The model of metal deformation provides exciting force for the rolls dynamic model, and the roils dynamic model and metal deformation model couple together. Then, based on the two models, the dynamic model of rolling mill system based on strip crown control is established. The Newmark-13 method is used to solve the problem, and the dynamic changes of these parameters are obtained as follows：（1） The bending of work roll and backup roll changes with time; （2） The strip crown changes with time; （3） The distribution of rolling force changes with time. Take some cold tandem rolling mill as subject investigated, simulation results and the comparisons with experimental results show that the dynamic model built is rational and correct. The proposed research provides effective theory for optimization of device and technological parameters and development of new technology, plays an important role to improve the strip control precision and str

关键词： strip crown transverse vibration of rolls dynamic simulation dynamic conservation of material flow

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Establishment Method of Shape Standard Curve Based on Stepwise Optimization and Its Compensation Models

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Chinese Journal of Mechanical Engineering 2011年第1期24卷 105-112页

作者： SUN Yabo LIU Hongmin peng yan Engineering Research Center of Rolling Equipment and Complete Technology of Ministry of Education Yanshan University Qinhuangdao 066004 China State Key Laboratory of Metastable Materials Science ＆ Technology Yanshan University Qinhuangdao 066004 China

There are very few researches on the shape standard curve currently,and they merely remain on the level of description of the general concept and production experiences,lacking of the in-depth theoretical analysis,and the concrete principle,method and steps for determining the shape standard curve are not put forward,therefore,they are not applicable in industrial *** is the weakest spot in the research on the basic shape *** this paper,the basic shape standard curve and the transverse distribution curve of the exit thickness are attained with stepwise optimization,which is based on the theoretical calculation method of the shape standard curve of strip mills proposed by *** calculating the shape discrimination model and the shape forecast model separately,the simultaneous iterative calculation by the previous method is avoided,and the speed and stability of calculation are *** compensation models of the transverse temperature difference of the strip,the shape detection roller deflection and the shape of the strip coil are established,respectively,meantime,the basic shape standard curves are compensated,and the relatively perfect theoretical establishment method of the shape standard curve is *** simulation and calculation are done on a 1 220 mm five-stand cold strip tandem *** simulation and calculation result shows that the principle,method and steps for determining the shape standard curve are correct and feasible,and the correctness of theoretical analysis and calculation is *** paper proposes an idea and a method for the establishment of the shape standard curve in the rolling processes of cold strip mills,which develop the theory and model of the shape standard curve and improve the quality and efficiency of the shape control in the rolling processes of cold strip mills.

关键词： strip rolling shape crown shape standard curve stepwise optimization compensation model

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A generalized L_2-discrepancy for cubature and uncertainty quantification of nonlinear structures

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Science China(Technological Sciences) 2016年第6期59卷 941-952页

作者： CHEN Jian Bing SONG peng yan State Key Laboratory of Disaster Reduction in Civil Engineering & School of Civil Engineering Tongji University College of Civil Engineering and Architecture Hebei University

The numerical method for multi-dimensional integrals is of great importance, particularly in the uncertainty quantification of engineering structures. The key is to generate representative points as few as possible but of acceptable accuracy. A generalized L2（GL2）-discrepancy is studied by taking unequal weights for the point set. The extended Koksma-Hlawka inequality is discussed. Thereby, a worst-case error estimate is provided by such defined GL2-discrepancy, whose dosed-form expression is available. The characteristic values of GL2-discrepancy are investigated. An optimal strategy for the selection of the representative point sets with a prescribed cardinal number is proposed by minimizing the GL2-discrepancy. The three typical examples of the multi-dimensional integrals are investigated. The stochastic dynamic response analysis of a nonlinear structure is then studied by incorporating the proposed method into the probability density evolution method. It is shown that the proposed method is advantageous in achieving tradeoffs between the efficiency and accuracy of the exemplified problems. Problems to be further studied are discussed.

关键词： Koksma-Hlawka inequality cubature L2-discrepancy nonlinear structure stochastic dynamics

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