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Dynamic stall control over a rotor airfoil based on AC DBD plasma actuation

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Advances in Aerodynamics 2021年第1期3卷 153-165页

作者： guangyin Zhao Yong Huang Yongdong Yang Guoqiang Li Hesen Yang State Key Laboratory of Aerodynamics China Aerodynamics Research and Development CenterMianyang 621000China Low Speed Aerodynamics Institute China Aerodynamics Research and Development CenterMianyang 621000China Science and Technology on Plasma Dynamics Laboratory Air Force Engineering UniversityXi’an 710038China.

At present,the control capability of dielectric barrier discharge(DBD)plasma actuation covers the flow velocity range of helicopter’s retreating blades,so it is necessary to extend it to the dynamic stall control of rotor airfoils.A DBD plasma actuator was adopted to control the dynamic stall of an oscillating CRA309 airfoil in this *** effectiveness of alternating current(AC)DBD plasma actuation on reducing the area of lift hysteresis loop of the oscillating airfoil was verified through pressure measurements at a Reynolds number of 5.2×10^(5).The influence of actuation parameters on the airfoil’s lift and moment coefficients was *** steady and unsteady actuation could effectively reduce the hysteresis loop area of the lift *** flow control effect of dynamic stall was strongly dependent on the history of angle of *** with the steady actuation,unsteady actuation had more obvious advantages in dynamic stall control,with reducing the area of lift hysteresis loop by more than 30%.The effects of plasma actuation on the airfoil’s flow field at both upward and downward stages were discussed at last.

关键词： Plasma actuation Flow separation Dynamic stall Hysteresis Dielectric barrier discharge

Murtagh安全诊断策略联合思维导图构建临床思维在全科教学门诊中的应用

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中国全科医学 2025年第6期28卷 673-680页

作者：杨玲杜雪平北京市西城区首都医科大学附属复兴医院月坛社区卫生服务中心 100045

全科教学门诊是培养住院医师规范化培训(简称住培)全科医生临床思维、提升全科诊疗能力的重要培训方法。本文用1例以乏力为主要表现的患者为教学案例,介绍全科教学门诊中采用澳大利亚著名全科医学专家John Murtagh提出的Murtagh安全诊... 详细信息

全科教学门诊是培养住院医师规范化培训(简称住培)全科医生临床思维、提升全科诊疗能力的重要培训方法。本文用1例以乏力为主要表现的患者为教学案例,介绍全科教学门诊中采用澳大利亚著名全科医学专家John Murtagh提出的Murtagh安全诊断策略启发住培全科医生对乏力进行诊断与鉴别诊断:(1)引起乏力的常见疾病有哪些?(2)哪些重要疾病是不能忽视的?(3)乏力有什么容易被遗漏的疾病?(4)是否存在潜在的容易被掩盖的疾病?(5)患者是否有话没有说?结合病史、体格检查和实验室检查结果初步诊断为抗中性粒细胞胞浆抗体相关性血管炎引起急进性肾小球肾炎可能性大,及时转诊,肾病理检查确诊乏力的病因为抗中性粒细胞胞浆抗体相关性肾小球肾炎,取得满意疗效。带教老师基于Murtagh安全诊断策略帮助住培全科医生构建乏力鉴别、分析的系统知识框架,从而提升住培全科医生的临床逻辑思维能力和解决临床实际问题的能力;以思维导图为辅助工具,将Murtagh安全诊断策略诊断与鉴别诊断思路可视化、形象化,优化教学效果。

关键词：全科医学 Murtagh安全诊断策略思维导图全科临床思维乏力抗中性粒细胞胞浆抗体相关性肾小球肾炎

Mechanical and corrosion properties of biodegradable magnesium mini-tubes with different grain morphologies:Size and distribution

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Journal of Materials Science & Technology 2024年第16期183卷 165-174页

作者： Xiang Wang Chun Chen Bozun Miao Zilong Wang Hua Huang Shaokang Guan guangyin Yuan National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240 China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China

Biodegradable magnesium(Mg)alloys have received much attention due to their biocompatibility and *** this study,to uncover the effects of grain morphologies,including grain size and distribution on mechanical and corrosion properties,biodegradable Mg-2.1Nd-0.2Zn-0.5Zr(wt.%)(denoted as JDBM)alloy mini-tubes for stent application with three typical microstructures were achieved success-fully by adjusting drawing *** with the bimodal structure exhibit the highest strengthductility balance attributed to the combined effects of fine grains and coarse grains,but show the fastest corrosion rate of about 1.00±0.136 mm/year mainly due to the formation of micro galvanic couples between coarse and fined *** with fine equiaxed grains show the lowest corrosion rate of about 0.17±0.059 mm/year,as well as uniform corrosion mode and mechanical properties of yield strength(YS)256±5.7 MPa,ultimate tensile strength(UTS)266±3.8 MPa,and elongation to failure(EL)13.5%±1.8%,attributed to the high-density grain *** with coarse equiaxed grains exhibit medium corrosion resistance and mechanical properties of about 175±4.8 MPa,221±4.0 MPa,and 21.53%±4.1%.Considering the mechanical and in vitro corrosion properties,biodegradable JDBM alloy implants are recommended to be composed of fine equiaxed grains,which can be used as microstructural targets for fabrication and processing.

关键词： Magnesium alloy Grain morphology Corrosion Mechanical properties Mini-tubes

Simulation-based optimization of control policy on multi-echelon inventory system for fresh agricultural products

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International Journal of Agricultural and Biological Engineering 2019年第2期12卷 184-194页

作者： guangyin Xu Jihao Feng Fenglei Chen Heng Wang Zhenfeng Wang College of Mechanical and Electrical Engineering Henan Agricultural UniversityZhengzhou 450002China Collaborative Innovation Center of Biomass Energy Henan Province.Zhengzhou 450002China Guizhou Province Branch of China National Tobacco Company Guiyang 550000China

As fresh agricultural products are perishable and vulnerable,reducing inventory cost is a strategic target for supply chain *** to design a reliable multi-echelon inventory control policy is still a great ***,the inventory cost of a three-level fresh agricultural products inventory system was firstly mathematically ***,the simulation-based optimization model of the multi-echelon inventory system for fresh agricultural products was proposed by using the Flexsim simulation software and the improved particle swarm optimization ***,the multi-echelon inventory system is simulated based on a large number of survey *** results demonstrate that the proposed simulation-based optimization model of multi-echelon inventory system for fresh agricultural products can provide decision-making and technical support for the formulation of inventory control policy,and also it shows that the modeling of system simulation is an effective method to solve the problem of complex system.

关键词： multi-echelon inventory system simulation-based optimization fresh agricultural products control policy Flexsim simulation software

Fabrication of ultra-high strength magnesium alloys over 540 MPa with low alloying concentration by double continuously extrusion

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Journal of Magnesium and Alloys 2018年第2期6卷 107-113页

作者： Hua Huang Hongwei Miao guangyin Yuan Zhongchang Wang Wenjiang Ding National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Innovation Institute for Materials Shanghai 200444China Department of Quantum Materials Science and Technology International Iberian Nanotechnology Laboratory(INL)Av.Mestre JoséVeiga s/nBragaPortugal

We prepare a new type of patented biodegradable biomedical Mg-Nd-Zn-Zr(JDBM)alloy system and impose double continuously extrusion(DCE)*** lowest processing temperature is 250℃for JDBM-2.1Nd and 310℃for JDBM-2.8Nd,which increases with the Nd *** highest yield strength of 541 MPa is achieved in JDBM-2.1 Nd samples when extruded at 250℃and the elongation is about 3.7%.Moreover,the alloy with a lower alloying element content can reach a higher yield strength while that with a higher alloying element content can reach a larger elongation after DCE ***,when extruded under the same conditions,the alloy with a higher alloying contents exhibits better tensile properties.

关键词： Magnesium alloys Microstructure Mechanical properties Double continuously extrusion

黄土区3种护坡植物三维可视化模拟与根系构型参数分析

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水土保持研究 2025年第1期32卷 218-226页

作者：张旭姚晨杜婷马志强朱宏杰汪艳杜峰中国科学院教育部水土保持与生态环境研究中心中国科学院水利部水土保持研究所中国科学院大学西北农林科技大学水土保持研究所

[目的]对植物根系数字化并进行三维实体可视化模拟，对于了解植物根系形态和为水保工程制图提供植物实物图库都具有重要的理论与实践意义。[方法]逐层挖掘黄土区酸枣、沙棘、狼牙刺3种护坡植物根系，使用3D数字化仪FasTrak获取根系三维... 详细信息

[目的]对植物根系数字化并进行三维实体可视化模拟，对于了解植物根系形态和为水保工程制图提供植物实物图库都具有重要的理论与实践意义。[方法]逐层挖掘黄土区酸枣、沙棘、狼牙刺3种护坡植物根系，使用3D数字化仪FasTrak获取根系三维点阵坐标后利用SketchUp软件对根系进行三维建模并提取根系构型参数。为了建立完整的植物地上地下三维实体图库，同时使用FreeScan UE激光扫描仪得到相应地上部点云数据，经Soildworks软件渲染后建立植物地上部三维模型。[结果](1)建立了3种植物的地上地下三维实体模型图；(2)3种植物的根幅/根深均大于1(1.10～3.41),根系在水平方向上占有优势，狼牙刺最小为1.10;(3)3种植物冠幅/根幅分别为酸枣(0.25)、沙棘(0.69)、狼牙刺(0.73),均小于1,植物根系较地上部在水平方向上占优；(4)3种植物Fitter拓扑指数均接近于1,分别为酸枣(0.915)、沙棘(0.802)、狼牙刺(0.771),接近于鱼尾型分支；(5)植物根系总根长、总表面积、总体积在上坡方向占比大于50%,均在上坡方向更有优势。[结论]所建立的植物三维模型图对植物还原度高，为整株植物三维可视化模拟提供了一种方法。

关键词：黄土区整株植物三维可视化模拟 SketchUp 根系形态

Lens-Like Effect in LiNbO_(3) : Fe Photorefractive Crystal

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Chinese Physics Letters 1993年第5期10卷 306-309页

作者： XU Jingjun LIU Junmin ZHANG guangyin LIU Simin Department of Physics Nankai UniversityTianjin 300071

The lens-like effects,both photorefractive effect and thermo-optical effect,were studied in the LiNbO_(3):Fe *** threshold light intensity above which the photorefractive effect was overwhelmed b-v the thermal effect was determined and the thermo-optical coefficient dn/dT is evaluated by the Z-scanning *** limiting characteristics of LiNbO_(3):Fe sheet is examined.

关键词： effect (3) Crystal

Enhanced dewatering characteristics of waste activated sludge with Fenton pretreatment： effectiveness and statistical optimization

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Frontiers of Environmental Science & Engineering 2014年第2期8卷 267-276页

作者： guangyin ZHEN Xueqin LU Baoying WANG Youcai ZHAO Xiaon CHAI Dongjie NIU Tiantao ZAO The State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and Engineering Tongji University Slmnghai 200092 China School of Environmental and Chemical Engineering Shanghai University Shanghai 200444 Chiaa Graduate School of Environmental Studies Tohoku University Sendai Miyagi 980-8579 Japan Shanghai Tongji Construction Co. Ltd Shanghai 200092 China

In this work, the enhanced dewaterabing characteristics of waste activated sludge using Fenton pretreatment was investigated in terms of effectiveness and statistical optimization. Response surface method （RSM） and central composite design （CCD） were applied to evaluate and optimize the effectiveness of important operational parameters, i.e., H202 concentrations, Fe2＋ concentrations and initial pH values. A significant quadratic polynomial model was obtained （R2= 0.9189） with capillary suction time （CST） reduction efficiency as the response. Numerical optimization based on desirability function was carried out. The optimum values for H202, Fe2, and initial pH were found to be 178 mg-g-1 VSS （volatile suspended solids）, *** VSS and 3.8, respectively, at which CST reduction efficiency of 98.25% could be achieved. This complied well with those predicted by the established polynomial model. The results indicate that Fenton pretreatment is an effective technique for advanced waste activated sludge dewatering. The enhancement of sludge dewaterability by Fenton＇s reagent lies in the migration of sludge bound water due to the disintegration of sludge flocs and microbial cells lysis.

关键词： Fenton pretreatment response surface meth- odology (RSM) capillary suction time (CST) dewater- abilty molecular weight distribution

In vitro and in vivo evaluations of Mg-Zn-Gd alloy membrane on guided bone regeneration for rabbit calvarial defect

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Journal of Magnesium and Alloys 2021年第1期9卷 281-291页

作者： Jiawen Si Hongzhou Shen Hongwei Miao Yuan Tian Hua Huang Jun Shi guangyin Yuan Guofang Shen Department of Oral and Craniomaxillofacial Surgery Shanghai Ninth People’s HospitalCollege of StomatologySchool of MedicineShanghai Jiao Tong UniversityShanghai Key Laboratory of StomatologyNational Clinical Research Center for Oral DiseasesShanghai200011China National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240 China

To develop a biodegradable membrane with guided bone regeneration(GBR),a Mg-2.0Zn-1.0Gd alloy(wt.%,MZG)membrane with Ca-P coating was designed and fabricated in this *** microstructure,hydrophilicity,in vitro degradation,cytotoxicity,antibacterial effect and in vivo regenerative performance for the membrane with and without Ca-P coating were *** coating,the membrane exhibited an enhance hydrophilicity and corrosion resistance,showed good in vitro cytocompatibility upon MC3T3E-1 cells,and exhibited excellent antibacterial effect against ***,Staphylococcus epidermis and Staphylococcus aureus,*** vivo experiment using the rabbit calvarial defect model confirmed that Ca-P coated MZG membrane underwent progressive degradation without inflammatory reaction and significantly improved the new bone formation at both 1.5 and 3 months after the *** the results strongly indicate that MZG with Ca-P coating have great potential for clinical application as GBR membranes.

关键词： Magnesium alloy membrane Calcium-phosphate coating Antibacterial Biodegradable Guided bone regeneration