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Modeling Reynolds stress anisotropy invariants via machine learning

Acta Mechanica Sinica 2024年第6期40卷 50-63页

作者： Xianglin Shan Xuxiang Sun wenbo cao Weiwei Zhang Zhenhua Xia School of Aeronautics Northwestern Polytechnical UniversityXi’an710072China Department of Engineering Mechanics Zhejiang UniversityHangzhou310027China

The presentation and modeling of turbulence anisotropy are crucial for studying large-scale turbulence structures and constructing turbulence ***,accurately capturing anisotropic Reynolds stresses often relies on expensive direct numerical simulations(DNS).Recently,a hot topic in data-driven turbulence modeling is how to acquire accurate Reynolds stresses by the Reynolds-averaged Navier-Stokes(RANS)simulation and a limited amount of data from *** existing studies use mean flow characteristics as the input features of machine learning models to predict high-fidelity Reynolds stresses,but these approaches still lack robust generalization *** this paper,a deep neural network(DNN)is employed to build a model,mapping from tensor invariants of RANS mean flow features to the anisotropy invariants of high-fidelity Reynolds *** the aspects of tensor analysis and input-output feature design,we try to enhance the generalization of the model while preserving invariance.A functional framework of Reynolds stress anisotropy invariants is derived *** irreducible invariants are then constructed from a tensor group,serving as alternative input features for ***,we propose a feature selection method based on the Fourier transform of periodic *** results demonstrate that the data-driven model achieves a high level of accuracy in predicting turbulence anisotropy of flows over periodic hills and converging-diverging ***,the well-trained model exhibits strong generalization capabilities concerning various shapes and higher Reynolds *** approach can also provide valuable insights for feature selection and data generation for data-driven turbulence models.

关键词： Reynolds stress Anisotropy invariant Tensor analysis Machine learning

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Non-coding RNA as future target for diagnose and treatment of perineural invasion in cancers

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BIOCELL 2024年第6期48卷 923-934页

作者： BINGJIE LI wenbo cao JINJING XIAO YIXIAO CHEN QIYING WEI MINGJIN YUE SAIJUN MO Department of Pathophysiology School of Basic Medical SciencesZhengzhou UniversityZhengzhouChina Collaborative Innovation Center of Henan Province for Cancer Chemoprevention ZhengzhouChina State Key Laboratory of Esophageal Cancer Prevention and Treatment ZhengzhouChina Department of Research and Development Henan Tianxing Education and Media Company LimitedZhengzhouChina

Perineural invasion(PNI),a particularly insidious form of tumor metastasis distinct from hematogenous or lymphatic spread,has the capacity to extend well beyond the primary tumor site,inﬁltrating distant regions devoid of lymphatic or vascular *** often heralds a decrease in patient survival rates and is recognized as an indicator of an unfavorable prognosis across a variety of *** its clinical signiﬁcance,the underlying molecular mechanisms of PNI remain elusive,complicating the development of speciﬁc and efﬁcacious diagnostic and therapeutic *** the realm of cancer research,non-coding RNAs(ncRNAs)have attracted considerable attention due to their multifaceted roles and cancer-speciﬁc expression proﬁles,positioning them as promising candidates for applications in cancer diagnostics,prognostics,and *** the various types of ncRNAs,microRNAs(miRNAs),long non-coding RNAs(lncRNAs),and circular RNAs(circRNAs)have emerged as inﬂuential players in *** involvement is increasingly recognized as a contributing factor to tumor progression and therapeutic *** study synthesizes and explores the diverse functions and mechanisms of ncRNAs in relation to PNI in *** comprehensive review aims to shed light on cutting-edge perspectives that could pave the way for innovative diagnostic and therapeutic approaches to address the challenges posed by PNI in oncology.

关键词： Perineural invasion Non-coding RNA Diagnose and treatment Cancer Biomarker

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Synthesis and luminescence properties of the europium quaternary complexes nanoparticles

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Science China Chemistry 2014年第6期57卷 791-796页

作者： WANG DongMei cao wenbo FAN Jian College of Chemical and Environmental Engineering Shandong University of Science and Technology Key Laboratory of Supramolecular Structure & Materials College of ChemistryJilin University

In this paper,the nanometer-sized(200 nm)quaternary rare-earth complex Eu(BA)(TTA)2phen was successfully prepared by using the method of optimizing chemical *** characterizations of these nanoparticles were performed by using elemental analysis,thermogravimetric analysis,infrared spectroscopy,fluorescence spectroscopy,transmission electron microscopy and luminescence *** results indicate that they are better than common ternary complexes at light-emitting performance,luminescence properties,thermal stability,uniformity and particle size;they can also be further mixed with a suitable polymer to form functional rare earth *** to the common solid materials,the quaternary complex has better and unique characteristics such as nanoparticle size effect and surface effect.A foundation had been laid for the further expansion of its application in the field of light-emitting and magnetic materials.

关键词： luminescence properties europium nanoparticles

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基于双边补偿期权的PPP项目价值评估模型及应用研究——以昆明东格高速公路项目为例

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财务管理研究 2024年第5期 22-29页

作者：吴孝灵谭深曹文博瞿萌南京财经大学南京210023 江苏扬子江鼎荟创新投资有限公司南京210000

针对PPP项目补偿受项目收益不确定性的影响,首先在收益确定假设下构建项目特许权价值模型,给出事前补偿机制;其次基于项目收益不确定性,借鉴期权对风险转移的思想,引入政府与社会资本共同持有双边补偿期权,构建双边补偿期权下的PPP项目... 详细信息

针对PPP项目补偿受项目收益不确定性的影响,首先在收益确定假设下构建项目特许权价值模型,给出事前补偿机制;其次基于项目收益不确定性,借鉴期权对风险转移的思想,引入政府与社会资本共同持有双边补偿期权,构建双边补偿期权下的PPP项目价值评估模型;最后将所构建模型应用于昆明东格高速公路项目的价值评估,进行案例研究。研究发现,当项目收益不确定性较大时,PPP项目适合采取双边期权补偿,该补偿方式相较于事前补偿更有助于促进政府方和社会资本方通过共担风险提高PPP项目价值;而当项目收益不确定性较低时,PPP项目适合采取事前补偿,该补偿方式相较于双边期权补偿对激励社会资本方积极投资PPP项目具有更实际的价值。

关键词： PPP项目政府补偿双边期权价值评估

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Fabrication of magnetically recyclable yolk-shell Fe_(3)O_(4)@TiO_(2) nanosheet/Ag/g-C_(3)N_(4) microspheres for enhanced photocatalytic degradation of organic pollutants

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Nano Research 2021年第7期14卷 2363-2371页

作者： Yan Lv Lin Yue Imran Mahmood Khan You Zhou wenbo cao Sobia Niazi Zhouping Wang State Key Laboratory of Food Science and Technology Jiangnan UniversityWuxi 214122China School of Food Science and Technology Jiangnan UniversityWuxi 214122China International Joint Laboratory on Food Safety Jiangnan UniversityWuxi 214122China Collaborative Innovation Center of Food Safety and Quality Control of Jiangsu Province Jiangnan UniversityWuxi 214122China School of Food Science and Technology National Engineering Research Center of SeafoodDalian Polytechnic UniversityDalian 116024China

Herein,we report the fabrication of Fe_(3)O_(4)@TiO_(2) nanosheet/Ag/g-C_(3)N_(4)(Fe_(3)O_(4)@ns-TiO_(2)/Ag/g-C_(3)N_(4))composite photocatalysts with well-designed hierarchical yolk-shell *** endow the composites with fascinating features,multiple functional components are perfectly integrated into the definite *** photodegradation experiments of organic pollutants revealed a significant enhancement in photocatalytic activity of developed composites as compared to P25,which is mainly due to the synergetic interaction of the tailored three-dimensional(3D)yolk-shell porous nanostructure,extended sunlight response range,and retarded the recombination probability of photogenerated *** importantly,the hybrid samples exhibited superior magnetic properties due to the magnetic *** excellent magnetic recyclability and reusability of the photocatalysts are verified by the magnetic hysteresis loop and cyclic photocatalytic degradation experiments,which is significant for the green and sustainable applications of *** its remarkable photocatalytic performance and expectant magnetic recyclability,the composite photocatalysts are expected to be a promising candidate to dispose of future environmental issues.

关键词： TiO_(2)nanosheet Ag nanoparticles g-C_(3)N_(4) hierarchical yolk-shell structure photocatalysis magnetic separation

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Machine learning of partial differential equations from noise data

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Theoretical & Applied Mechanics Letters 2023年第6期13卷 441-446页

作者： wenbo cao Weiwei Zhang School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China

Machine learning of partial differential equations(PDEs)from data is a potential breakthrough for addressing the lack of physical equations in complex dynamic ***,sparse regression has emerged as an attractive ***,noise presents the biggest challenge in sparse regression for identifying equations,as it relies on local derivative evaluations of noisy *** study proposes a simple and general approach that significantly improves noise robustness by projecting the evaluated time derivative and partial differential term into a subspace with less *** method enables accurate reconstruction of PDEs involving high-order derivatives,even from data with considerable ***,we discuss and compare the effects of the proposed method based on Fourier subspace and POD(proper orthogonal decomposition)***,the latter yields better results since it preserves the maximum amount of information.

关键词： Partial differential equation Machine learning Sparse regression Noise data

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性别对急性缺血性卒中患者机械取栓术预后的影响

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中国脑血管病杂志 2024年第2期21卷 85-92页

作者：贾鹏曹文博杨斌谌燕飞王亚冰马青峰高鹏焦力群滨州医学院第二临床医学院山东省烟台市264100 首都医科大学宣武医院神经外科首都医科大学宣武医院神经内科

目的探讨性别差异对前循环急性大血管闭塞性卒中(AIS-LVO)患者机械取栓术预后的影响。方法回顾性连续纳入2019年1月至2021年12月在首都医科大学宣武医院神经外科接受机械取栓治疗的前循环AIS-LVO患者,于机械取栓术后90 d将改良Rankin量... 详细信息

目的探讨性别差异对前循环急性大血管闭塞性卒中(AIS-LVO)患者机械取栓术预后的影响。方法回顾性连续纳入2019年1月至2021年12月在首都医科大学宣武医院神经外科接受机械取栓治疗的前循环AIS-LVO患者,于机械取栓术后90 d将改良Rankin量表(mRS)评分0~2分定义为预后良好,mRS评分3~6分定义为预后不良。收集患者基线资料(年龄、性别)、临床资料;临床资料包括血管疾病危险因素[高血压病、糖尿病、高脂血症、冠状动脉粥样硬化性心脏病(简称“冠心病”)、心房颤动、吸烟史、饮酒史、卒中史]、抗血小板聚集和抗凝药物使用史、基线美国国立卫生研究院卒中量表(NIHSS)评分、脑梗死分型、静脉溶栓、麻醉类型、发病至急诊时间、穿刺至血管再通时间(PTR)、发病至血管再通时间、基线Alberta卒中项目早期CT评分(ASPECTS)、闭塞部位、侧支循环状态、术后即刻再通情况。分别以性别、预后进行分组(男性组与女性组、预后不良组与预后良好组),比较两组患者基线和临床资料的差异。采用单因素Logistic回归分析性别在不同预后组间的差异,并采用Logistic多因素回归分析评估性别是否对机械取栓术患者的预后产生影响。结果共纳入了347例前循环AIS-LVO患者,其中女性组126例,男性组221例;预后良好组169例,预后不良组178例。(1)女性组患者年龄、心房颤动比例、基线NIHSS评分均高于男性组[70.5(59.0,80.0)岁比64.0(56.0,71.0)岁,Z=19.720;41.3%(52/126)比21.7%(48/221),χ^(2)=14.950;16(13,19)分比14(11,18)分,Z=9.670],吸烟、饮酒比例均低于男性组[5.6%(7/126)比54.8%(121/221),χ^(2)=83.420;3.2%(4/126)比49.8%(110/221),χ^(2)=78.990],组间差异均有统计学意义(均P0.05)。(2)单因素分析显示,预后不良组女性比例、年龄、冠心病比例、卒中史比例、NIHSS评分、PTR均高于预后良好组[41.6%(74/178)比30.8%(52/169),70(61,77)岁比64(54,70)岁,31.5%(56/178)比16.0%(27/169),23.0%(41/178)比13.6%(23/169),17(13,20)分比13(11,17)分,39(29,69)min比36(25,50)min],而ASPECTS、良好侧支比例、血管成功再通比例均低于预后良好组[8(7,9)分比9(8,10)分,15.7%(28/178)比55.0%(93/169),86.0%(153/178)比98.2%(166/169)],组间差异均有统计学意义(均P0.05)。结论接受取栓治疗的前循环AIS-LVO预后良好患者中女性比例低于预后不良者,但性别并非前循环AIS-LVO患者接受机械取栓术预后的影响因素。本研究结果尚需多中心、大样本数据进一步验证。

关键词：卒中机械取栓性别差异预后

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基于微信平台的全程护理模式在大肠息肉日间手术中的应用效果

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医药高职教育与现代护理 2024年第2期7卷 139-143页

作者：陈玉珍李聪懿陈斌张苑榆肖婕曹文波粤北人民医院消化内科广东韶关512000

目的建立基于微信平台的全程护理模式在大肠息肉日间手术中的应用,并评价其应用效果。方法选取2021年7月至2022年6月粤北人民医院消化内科拟行大肠息肉日间手术的患者200例为研究对象,采用随机数字表法随机分为对照组和观察组,各100... 详细信息

目的建立基于微信平台的全程护理模式在大肠息肉日间手术中的应用,并评价其应用效果。方法选取2021年7月至2022年6月粤北人民医院消化内科拟行大肠息肉日间手术的患者200例为研究对象,采用随机数字表法随机分为对照组和观察组,各100例。对照组采用传统宣教方式和护理措施,观察组则采用基于微信平台的全程护理模式,比较两组患者的肠道准备质量指标、手术质量安全指标和患者满意度等。结果 (1)对照组和观察组最终分别纳入97例和95例患者;(2)与对照组相比,观察组患者的盲肠插管时间较短,肠道准备质量评分(BBPS评分)、肠道准备优良率均较高(均P<0.05);(3)观察组患者的术后总并发症发生率低于对照组,患者满意度高于对照组(均P<0.05)。结论基于微信平台的全程护理模式有助于改善大肠息肉日间手术患者的肠道准备质量、降低手术并发症发生率、提升患者满意度。

关键词：大肠息肉日间手术微信平台全程护理

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Preface for Feature Topic on Human Driver Behaviours for Intelligent Vehicles

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Automotive Innovation 2024年第1期7卷 1-3页

作者： Dongpu cao Argyrios Zolotas Meng Wang Mohammad Pirani wenbo Li School of Vehicle and Mobility Tsinghua University30 Shuangqing Rd.Beijing 100084China School of Aerospace Cranfield UniversityCranfieldUK Friedrich List Faculty of Transport and Traffic Sciences Technische Universität DresdenDresdenGermany Department of Mechanical and Mechatronics Engineering University of WaterlooWaterlooCanada

1 Introduction With the advancement of sensing,machine learning,and computing systems,automated driving applications have been growing rapidly *** with the devel-opment of communication technologies such as dedicated short-range communication,extensively emerging intelli-gent vehicles have been developed to connect with vehicles,pedestrians,infrastructures,and clouds in the transportation ***,intelligent vehicles have become intelligent mobile terminal that carries rich functions and services.

关键词： Driver Together driving

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Data-driven and physical-based identification of partial differential equations for multivariable system

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Theoretical & Applied Mechanics Letters 2022年第2期12卷 127-131页

作者： wenbo cao Weiwei Zhang School of aeronautics Northwestern Polytechnical UniversityXi’an 710072China

Data-driven partial differential equation identification is a potential breakthrough to solve the lack of physical equations in complex dynamic ***,existing equation identification methods still cannot effectively identify equations from multivariable complex *** this work,we combine physical constraints such as dimension and direction of equation with data-driven method,and successfully identify the Navier-Stocks equations from the flow field data of Karman vortex *** method provides an effective approach to identify partial differential equations of multivariable complex systems.

关键词： Partial differential equation identification Data-driven Multivariable system Dimensional analysis

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