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Optimal Structural Parameters for a Plastic Centrifugal Pump Inducer

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Fluid Dynamics & Materials Processing 2023年第4期19卷 869-899页

作者： Wenbin Luo Lingfeng Tang Yuting Yan yifang shi School of Mechanical Engineering Anhui Polytechnic UniversityWuhu241000China Hohai University Nanjing210098China

The aim of the study is to determine the optimal structural parameters for a plastic centrifugal pump inducer within the framework of an orthogonal experimental method.For this purpose,a numerical study of the related flow field is performed using CFX.The shaft power and the head of the pump are taken as the evaluation indicators.Accordingly,the examined variables are the thickness(S),the blade cascade degree(t),the blade rim angle(β1),the blade hub angle(β2)and the hub length(L).The impact of each structural parameter on each evaluation index is examined and special attention is paid to the following combinations:S2 mm,t 2,β1235°,β2360°and L 140 mm(corresponding to a maximum head of 98.15 m);S 5 mm,t 1.6,β1252°,β2350°and L 140 mm(corresponding to a minimum shaft power of 63.06 KW).Moreover,using least squares and fish swarm algorithms,the pump shaft power and head are further optimized,yielding the following optimal combination:S 5 mm,t 1.9,β1252°,β2360°and L 145 mm(corresponding to the maximum head of 91.90 m,and a minimum shaft power of 64.83 KW).

关键词： Plastic centrifugal pump inducer cascade degree shaft power parameter optimization

Optimization of the Structural Parameters of a Plastic Centrifugal Pump in the Framework of a Flow Field Analysis

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Fluid Dynamics & Materials Processing 2022年第3期18卷 789-813页

作者： Wenbin Luo Youmin Wang Yuting Yan yifang shi Zhendong Zhang School of Mechanical Engineering Anhui Polytechnic UniversityWuhu241000China Hohai University Nanjing210098China Anhui Institute of Information Technology Wuhu241199China

In order to determine the optimal structural parameters of a plastic centrifugal pump in the framework of an orthogonal-experiment approach,a numerical study of the related flow field has been performed using CFX.The thickness S,outlet angleβ2,inlet angleβ1,wrap angle,and inlet diameter D1 of the splitter blades have been considered as the variable factors,using the shaft power and efficiency of the pump as evaluation indices.Through a parametric analysis,the relative importance of the influence of each structural parameter on each evaluation index has been obtained,leading to the following combinations:β119°,β235°,S 2 mm,wrap angle 154°,and D185 mm(corresponding to the maximum efficiency of 75.48%);β119°,β220°,S 6 mm,wrap angle 158°,and D181 mm(corresponding to the minimum shaft power of 75.48%).Moreover,the grey correlation method has been applied to re-optimize the shaft power and efficiency of the pump,leading to the following optimal combination:β119°,β215°,S 4 mm,D181 mm,and wrap angle 152°(corresponding to the maximum efficiency of 71.81%and minimum shaft power of 2.187 kW).

关键词： Plastic centrifugal pump splitter blade orthogonal experiment grey correlation method optimal combination

Scaling Notebooks as Re-configurable Cloud Workflows

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Data Intelligence 2022年第2期4卷 409-425页

作者： Yuandou Wang Spiros Koulouzis Riccardo Bianchi Na Li yifang shi Joris Timmermans W.Daniel Kissling Zhiming Zhao Multiscale Networked Systems Informatics InstituteUniversity of Amsterdam1098XH AmsterdamThe Netherlands Life Watch ERIC Virtual Lab&InnovationCenter(VLIC)Science Park 9041098XH AmsterdamThe Netherlands Institute for Biodiversity and Ecosystem Dynamics(IBED) 1098xH AmsterdamThe Netherlands

Literate computing environments,such as the Jupyter(i.e.,Jupyter Notebooks,JupyterLab,and JupyterHub),have been widely used in scientific studies;they allow users to interactively develop scientific code,test algorithms,and describe the scientific narratives of the experiments in an integrated document.To scale up scientific analyses,many implemented Jupyter environment architectures encapsulate the whole Jupyter notebooks as reproducible units and autoscale them on dedicated remote infrastructures(e.g.,highperformance computing and cloud computing environments).The existing solutions are stl limited in many ways,e.g.,1)the workflow(or pipeline)is implicit in a notebook,and some steps can be generically used by different code and executed in parallel,but because of the tight cell structure,all steps in the Jupyter notebook have to be executed sequentially and lack of the flexibility of reusing the core code fragments,and 2)there are performance bottlenecks that need to improve the parallelism and scalability when handling extensive input data and complex computation.In this work,we focus on how to manage the workflow in a notebook seamlessly.We 1)encapsulate the reusable cells as RESTful services and containerize them as portal components,2)provide a composition tool for describing workflow logic of those reusable components,and 3)automate the execution on remote cloud infrastructure.Empirically,we validate the solution's usability via a use case from the Ecology and Earth Science domain,illustrating the processing of massive Light Detection and Ranging(LiDAR)data.The demonstration and analysis show that our method is feasible,but that it needs further improvement,especially on integrating distributed workflow scheduling,automatic deployment,and execution to develop as a mature approach.

关键词： Scientific experiments Jupyter Notebooks Workflow management Ecosystem structure data products Cloud Scalability

A split target detection and tracking algorithm for ballistic missile tracking during the re-entry phase

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Defence Technology（防务技术） 2020年第6期16卷 1142-1150页

作者： Muhammad Asad Sumair Khan Ihsanullah Zahid Mehmood yifang shi Sufyan Ali Memon Uzair Khan Department of Electrical and Computer Engineering COMSATS University IslamabadAbbottabad CampusPakistan Department of Computer Science COMSATS University IslamabadAbbottabad CampusPakistan Electrical Engineering Department Indus UniversityKarachiPakistan Department of Automation Hangzhou Dianzi UniversityXiasha Higher Education Zone2nd StreetHangzhou310018China

In the re-entry phase of a ballistic missile,decoys can be deployed as a mean to overburden enemy defenses.This results in a single track being split into multiple track-lets.Tracking of these track-lets is a critical task as any miss in the tracking procedure can become a cause of a major threat.The tracking process becomes more complicated in the presence of clutter.The low detection rate is one of the factors that may contribute to increasing the difficulty level in terms of tracking in the cluttered environment.This work introduces a new algorithm for the split event detection and target tracking under the framework of the joint integrated probabilistic data association(JIPDA)algorithm.The proposed algorithm is termed as split event-JIPDA(SE-JIPDA).This work establishes the mathematical foundation for the split target detection and tracking mechanism.The performance analysis is made under different simulation conditions to provide a clear insight into the merits of the proposed algorithm.The performance parameters in these simulations are the root mean square error(RMSE),confirmed true track rate(CTTR)and confirmed split true track rate(CSTTR).

关键词： Split event probability JIPDA Data association Ballistic missile Estimation

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全生命周期视域下实验室安全运行机制研究

实验室科学 2024年第3期27卷 171-174,178页

作者：石义芳杨进广东药科大学医药信息工程学院广东广州510006

高校实验室安全日益受到政府和各高校的高度重视,但安全事故仍然时有发生,实验室安全问题日益凸显,其管理面临巨大的困难和挑战,缺乏运行流畅的安全运行机制是关键因素之一。实验室安全始终处于不断变化的状态,从全生命周期的视角,建立... 详细信息

高校实验室安全日益受到政府和各高校的高度重视,但安全事故仍然时有发生,实验室安全问题日益凸显,其管理面临巨大的困难和挑战,缺乏运行流畅的安全运行机制是关键因素之一。实验室安全始终处于不断变化的状态,从全生命周期的视角,建立“抓源头、知状态、顺流程、控行为、明责任”的实验室动态安全运行机制,做到全过程、全要素、全方位的管理和控制,这对消除安全隐患、有效防范实验室事故发生、确保实验室安全有重要意义。

关键词：实验室安全全生命周期安全运行机制

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基于深度强化学习的多目标跟踪技术研究

无线电通信技术 2024年第1期50卷 187-192页

作者：杨麒霖刘俊管坚莫倩倩陈华杰谷雨石义芳杭州电子科技大学通信信息传输与融合技术国防重点学科实验室浙江杭州310018

在随机有限集多目标跟踪过程中,由于跟踪问题的复杂性,会耗费大量的计算成本,特别是在目标和杂波密集的复杂情况中,计算成本呈指数增长。随机有限集中通常采用的分配算法——例如Murty算法的时间复杂度为滤波器生成的代价矩阵规模的三... 详细信息

在随机有限集多目标跟踪过程中,由于跟踪问题的复杂性,会耗费大量的计算成本,特别是在目标和杂波密集的复杂情况中,计算成本呈指数增长。随机有限集中通常采用的分配算法——例如Murty算法的时间复杂度为滤波器生成的代价矩阵规模的三次方。为了减少跟踪耗时,结合组合优化的思想,将代价矩阵重定义为二分图,采用了一种基于深度强化学习的二分图匹配算法,取代传统随机有限集中的分配算法,并通过仿真实验验证了所提方法的可行性。实验表明,所提方法在保证跟踪性能的前提下减少了跟踪耗时,提升了跟踪实时性。

关键词：随机有限集强化学习组合优化

椎旁肌退变与L5/S1峡部裂性腰椎滑脱程度的关系

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中国脊柱脊髓杂志 2024年第5期34卷 484-489页

作者：宋萌晨拾一方李龙域张立博贾杰龚克时利军尚春风尚国伟陈松峰寇红伟毛克亚刘宏建郑州大学第一附属医院骨科郑州市450052 中国人民解放军总医院骨科北京市100853

目的:探究椎旁肌退变与L5/S1峡部裂性腰椎滑脱程度的关系。方法:回顾性分析2020年1月1日~2023年12月31日郑州大学第一附属医院骨科收治的108例L5/S1双侧峡部裂患者的临床资料,其中女62例,男46例,年龄26~86(52.8±10.4)岁,所有患者腰椎... 详细信息

目的:探究椎旁肌退变与L5/S1峡部裂性腰椎滑脱程度的关系。方法:回顾性分析2020年1月1日~2023年12月31日郑州大学第一附属医院骨科收治的108例L5/S1双侧峡部裂患者的临床资料,其中女62例,男46例,年龄26~86(52.8±10.4)岁,所有患者腰椎侧位及动力位X线、腰椎CT和腰椎MRI等影像学资料完整。根据是否伴有滑脱及Meyerding分度将患者分为无滑脱组(28例)、Ⅰ度滑脱组(46例)和Ⅱ度滑脱组(34例)。在腰椎轴位MRI的L5下终板层面测量椎体横截面积(V CSA)、竖脊肌横截面积(ES CSA)、多裂肌横截面积(MF CSA)以及关节突关节角度(FJA),并计算平均关节突关节角度(mFJA)、多裂肌相对横截面积(MF rCSA)、竖脊肌相对横截面积(ES rCSA)、多裂肌脂肪浸润率(MF FIR)及竖脊肌脂肪浸润率(ES FIR)。比较三组间年龄、性别、体质指数(BMI)、病程、V CSA、mFJA、MF CSA、ES CSA、MF rCSA、ES rCSA、MF FIR以及ES FIR之间的差异,并使用有序Logistics回归分析年龄、性别、病程、BMI、mFJA、MF rCSA、ES rCSA、MF FIR、ES FIR等参数与峡部裂性腰椎滑脱程度的关系。结果:各组间年龄、体重、BMI、V CSA、mFJA无统计学差异(P>0.05)。无滑脱组女性患者(29%)占比显著低于Ⅰ度滑脱组(61%)和Ⅱ度滑脱组(76%)(P0.05),Ⅱ度滑脱组的ES CSA和ES rCSA(3183.2±1196.38mm^(2)和2.14±1.11)显著高于Ⅰ度滑脱组(2579.28±896.56mm^(2)和1.65±0.65)及无滑脱组(2401.40±742.98mm^(2)和1.56±0.58)(P0.05);有序Logistics回归分析结果显示,女性(OR=2.81,95%CI:1.120~7.062,P=0.028)及MF FIR增加(OR=1.044,95%CI:1.003~1.088,P=0.034)是峡部裂性腰椎滑脱程度加重的独立危险因素(P<0.05)。结论:滑脱程度较重的双侧峡部裂患者多裂肌脂肪浸润更严重,并且出现了竖脊肌的肥大,女性及MF FIR增加是峡部裂性腰椎滑脱程度加重的独立危险因素。

关键词：峡部裂性腰椎滑脱椎旁肌脂肪浸润横截面积

Track-to-track association using fuzzy membership function and clustering for distributed information fusion

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骨质疏松症合并中重度椎旁肌脂肪浸润快速评分系统预测腰椎退变性疾病手术效果

第37届中国控制会议

作者： Shuaixin Hong Dongliang Peng yifang shi Automation School Hangzhou Dianzi University

In distributed information fusion application, developing an efficient track-to-track association approach becomes crucially important which may significantly benefit the sequent track-to-track fusion procedure. This paper proposes a novel track-to-track association method specialized for distributed multitarget tracking using more than two sensors. In order to mathematically interpret how probable that the two tracks from two different sensors are tracking the same targets, the fuzzy membership of the two tracks are calculated, whose value is between 0 and 1, with bigger values indicating higher probability that the two tracks originate from the same target. Based on the calculated fuzzy membership matrix, the clustering methodology is then utilized to pick out the group of tracks tracking the same target. The simulation results validate the efficiency and superiority over the existing approach.

关键词： Distributed information track-to-track association fuzzy membership function clustering

来源： cnki会议评论

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中华实验外科杂志 2024年第1期41卷 157-161页

作者：拾一方李龙域贾杰尚春风陈松峰冷子宽尚国伟寇红伟毛克亚刘宏建郑州大学第一附属医院骨科医学部郑州450000 解放军总医院骨科医学部北京100853

目的探讨骨质疏松症(OP)合并中重度椎旁肌脂肪浸润快速评分系统对腰椎退变性疾病(LDD)手术效果的预测价值。方法分析2021年1月至2022年1月符合纳入标准于郑州大学第一附属医院郑东院区接受PLIF手术的141例患者作为研究对象,依据OP和中... 详细信息

目的探讨骨质疏松症(OP)合并中重度椎旁肌脂肪浸润快速评分系统对腰椎退变性疾病(LDD)手术效果的预测价值。方法分析2021年1月至2022年1月符合纳入标准于郑州大学第一附属医院郑东院区接受PLIF手术的141例患者作为研究对象,依据OP和中重度椎旁肌脂肪浸润的诊断分为无合并症组49例、OP或中重度椎旁肌脂肪浸润组68例和OP合并中重度椎旁肌脂肪浸润组24例,统计性别、年龄、症状持续时间、BMI、骨密度、术后出院日、出血量、手术节段数、双侧L3、L4、L5椎体下终板层面肌肉面积和脂肪浸润情况以及术前和术后复查时的疼痛视觉模拟评分(VAS)、Oswestry功能障碍指数问卷表(ODI)评分作为统计数据,按照有无合并症分为A组(无合并症组),B组(OP或中重度椎旁肌脂肪浸润组),C组(OP和中重度椎旁肌脂肪浸润组),应用SPSS(V26.0)进行统计分析,采用单因素方差分析,t检验比较3组患者手术预后指标。结果本研究中3组患者中性别、年龄、症状持续时间、BMI、术后出院日、出血量、手术节段数差异无统计学意义(P>0.05),3组患者各层面椎旁肌FCSA和FI%在大多数测量位点差异有统计学意义(P<0.05)。术后12个月C组VAS评分高于A、B组[(2.54±1.18)分比(0.84±1.11)、(1.29±1.19)分,F=17.63,P<0.05],ODI评分也高于A、B组[(24.25±11.78)分比(13.02±8.84)、(15.37±7.95)分,F=12.93,P<0.05],术后6个月C组VAS评分高于A、B组[(2.63±1.10)分比(0.94±1.09)、(1.34±1.23)分,F=17.34,P<0.05],ODI评分高于A、B组[(24.00±12.22)分比(13.61±8.91)、(16.31±8.72)分,F=10.19,P<0.05],术后3个月C组VAS评分高于A、B组[(4.04±1.23)分比(3.08±1.06)、(3.56±1.29)分,F=5.46,P<0.05],ODI评分也高于A、B组[(24.21±12.20)分比(17.04±8.38)、(21.26±11.45)分,F=4.10,P<0.05]。结论快速评分系统能够在一定程度上预测手术效果,为有相关合并症的LDD的治疗及围术期管理提供参考。

关键词：骨质疏松症椎旁肌脂肪浸润手术效果