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Neural network-based model predictive control with fuzzy-SQP optimization for direct thrust control of turbofan engine

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Chinese Journal of Aeronautics 2022年第12期35卷 59-71页

作者： Yangjing WANG Jinquan HUANG Wenxiang ZHOU Feng LU wenhao xu Jiangsu Province Key Laboratory of Aerospace Power System College of Energy and Power EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China

A nonlinear model predictive control method based on fuzzy-Sequential Quadratic Programming(SQP)for direct thrust control is proposed in this paper for the sake of improving the accuracy of thrust *** designed control system includes four parts,namely a predictive model,rolling optimization,online correction,and feedback *** the strong nonlinearity of engine,a predictive model is established by Back Propagation(BP)neural network for the entire flight envelope,whose input and output are determined with random forest algorithm and actual situation *** optimization typically uses SQP as the optimization algorithm,but SQP algorithm is easy to trap into local ***,the fuzzy-SQP algorithm is proposed to prevent this disadvantage using fuzzy algorithm to determine the initial value of *** addition to the traditional three parts of model predictive control,an online correction module is added to improve the predictive accuracy of the predictive model in the predictive time *** results show that the BP predictive model can reach a certain degree of predictive accuracy,and the proposed control system can achieve good tracking performance with the limited parameters within the safe range。

关键词： Direct thrust control Fuzzy-SQP algorithm Limit protection Neural network Nonlinear model predictive control Random forest Turbofan engine

Block Copolymer Supported Gold Nanoparticles Assemblies with Exposed Gold Surface

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Chemical Research in Chinese Universities 2022年第4期38卷 1118-1122页

作者： ZONG Chen LIU Guangnan xu wenhao CHEN Jie TANG Yun Department of Chemistry Laboratory of Advanced MaterialsShanghai Key Laboratory of Molecular CatalysisCollaborative Innovation Center of Chemistry for Energy MaterialsFudan UniversityShanghai200438P.R.China

Polymer-involved nanoparticles or nanoparticle assemblies are now facing a crossroad,where the exposure of nanoparticle and multiple nanoparticles cannot be obtained at the same ***,a new series of nanoparticle clusters is synthesized,where multiple gold nanoparticles assemble with amphiphilic block copolymers supporting *** exposure of gold nanoparticles of the structure is confirmed and increases the reduction rate of 4-nitrophenol by 60%.The assemblies can also be used as surface enhanced Raman scattering(SERS)probes with an enhancement factor(EF)as high as 3×10^(3).

关键词： Gold nanoparticle Block copolymer co-Assembly

Cold-induced retrotransposition of fish LINEs

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Journal of Genetics and Genomics 2017年第8期44卷 385-394页

作者： Shue Chen Mengchao Yu xu Chu wenhao Li Xiujuan Yin Liangbiao Chen Qingdao National Laboratory for Marine Science and Technology Qingdao 266237 China

Classes of retrotransposons constitute a large portion of metazoan genome. There have been cases re- ported that genomic abundance of retrotransposons is correlated with the severity of low environmental temperatures. However, the molecular mechanisms underlying such correlation are unknown. We show here by cell transfection assays that retrotransposition （RTP） of a long interspersed nuclear element （LINE） from an Antarctic nototbenioid fish Dissostichus mawsoni （droLl） could be activated by low temperature exposure, causing increased dmLl copies in the host cell genome. The cold-induced droll propagation was demonstrated to be mediated by the mitogen-activated protein kinases （MAPK）]p38 signaling pathway, which is activated by accumulation of reactive oxygen species （ROS） in cold-stressed conditions. Surprisingly, droLl transfected cells showed an increase in the number of viable cells after prolonged cold exposures than non-transfected cells. Features of cold inducibility of dmLl were reca- pitulated in LINEs of zebrafish origin both in cultured cell lines and tissues, suggesting existence of a common cold-induced LINE amplification in fishes. The findings reveal an important function of LINEs in temperature adaptation and provid insights into the MAPK/p38 stress responsive pathway that shapes LINE composition in fishes facing cold stresses. Copyright 2017, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, and Genetics Society of China. Published by Elsevier Limited and Science Press. All rights reserved.

关键词： RetrotransposonROSp38Cold adaptationLINE amplification

Analysis of Maximum Liquid Carrying Capacity Based on Conventional Tubing Plunger Gas Lift

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Energy Engineering 2024年第6期121卷 1521-1533页

作者： Yanqun Yu wenhao xu Yahui Huangfu Jinhai Liu Bensheng Wang Kai Liu College of Mechanical and Electronic Engineering China University of Petroleum(East China)Qingdao266580China Energy Technology&Services Oil Production Services Company CNOOCTianjin300450China

China’s unconventional gas fields have a large number of low-productivity and low-efficiency wells, many of whichare located in remote and environmentally harsh mountainous areas. To address the long-term stable productionof these gas wells, plunger-lift technology plays an important role. In order to fully understand and accurately graspthe drainage and gas production mechanisms of plunger-lift, a mechanical model of plunger-liquid column uplift inthe plunger-lift process was established, focusing on conventional plunger-lift systems and representative wellboreconfigurations in the Linxing region. The operating casing pressure of the plunger-lift process and the calculationmethod for the maximum daily fluid production rate based on the work regime with the highest fluid recovery ratewere determined. For the first time, the critical flow rate method was proposed as a constraint for the maximumliquid-carrying capacity of the plunger-lift, and liquid-carrying capacity charts for conventional plunger-lift withdifferent casing sizes were developed. The results showed that for 23/8 casing plunger-lift, with a well depth ofshallower than 808 m, the maximum drainage rate was 33 m3/d;for 27/8 casing plunger-lift, with a well depth ofshallower than 742 m, the maximum drainage rate was 50.15 m3/d;for 31/2 casing plunger-lift, with a well depthof shallower than 560 m, the maximum drainage rate was 75.14 m3/d. This research provides a foundation for thescientific selection of plunger-lift technology and serves as a decision-making reference for developing reasonableplunger-lift work regimes.

关键词： Unconventional well conventional tubing string plunger gas lift critical flow rate liquid carry-over chart version

All-optical object identification and threedimensional reconstruction based on optical computing metasurface

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Opto-Electronic Advances 2023年第12期6卷 5-14页

作者： Dingyu xu wenhao xu Qiang Yang Wenshuai Zhang Shuangchun Wen Hailu Luo Laboratory for Spin Photonics School of Physics and ElectronicsHunan UniversityChangsha 410082China School of Physics and Chemistry Hunan First Normal UniversityChangsha 410205China.

Object identification and three-dimensional reconstruction techniques are always attractive research interests in machine vision,virtual reality,augmented reality,and biomedical *** computing metasurface,as a two-dimensional artificial design component,has displayed the supernormal character of controlling phase,amplitude,polarization,and frequency distributions of the light beam,capable of performing mathematical operations on the input light ***,we propose and demonstrate an all-optical object identification technique based on optical computing metasurface,and apply it to 3D *** traditional mechanisms,this scheme reduces memory consumption in the processing of the contour surface *** identification and reconstruction of experimental results from high-contrast and low-contrast objects agree well with the real *** exploration of the all-optical object identification and 3D reconstruction techniques provides potential applications of high efficiencies,low consumption,and compact systems.

关键词： object identification three-dimensional reconstruction optical computing metasurface

Heterogeneity and function of cancer-associated fibroblasts in renal cell carcinoma

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Journal of the National Cancer Center 2023年第2期3卷 100-105页

作者： Haijia Tang wenhao xu Jiahe Lu Aihetaimujiang Anwaier Dingwei Ye Hailiang Zhang Department of Urology Fudan University Shanghai Cancer CenterFudan UniversityShanghaiChina Shanghai Genitourinary Cancer Institute ShanghaiChina Nanjing University of Chinese Medicine NanjingChina School of Cellular and Molecular Medicine University of BristolBristolUnited Kingdom

With the advancement of anticancer therapy,there is increasing interest in understanding the tumor microenvi-ronment(TME).Cancer-associated fibroblasts(CAFs)play a pivotal role in the TME and have been the focus of much research in recent *** play an active role in cancer progression through complex interactions with other cells in the TME,releasing regulatory factors,synthesizing and remodeling the extracellular ***-ever,research on the role of CAFs in renal cell carcinoma(RCC)is still in its nascent ***,we describe the origins and subgroups of CAFs,the roles of CAFs in the development and progression of RCC,the impact of CAFs on RCC prognosis,and the potential of CAFs as treatment targets in *** analyzing CAF subsets,biomarkers,and targeted therapies,we present the significance and contribution of CAFs in RCC ***,we highlight the distinct contribution of CAFs in advanced RCC through horizontal comparison with other *** paper provides a comprehensive perspective of recent and foundational studies on the role of CAFs in RCC and other types of cancers and new insights for further study of CAFs in RCC.

关键词： Cancer-associated fibroblasts Renal cell carcinoma Tumor microenvironment Tumor heterogeneity

RiceENCODE:A comprehensive epigenomicdatabase as a rice Encyclopedia of DNA Elements

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Molecular Plant 2021年第10期14卷 1604-1606页

作者： Liang Xie Minghao Liu Lun Zhao Kai Cao Peng Wang wenhao xu Wing-Kin Sung Xingwang Li Guoliang Li National Key Laboratory of Crop Genetic Improvement Hubei HongshanLaboratoryHuazhong Agricultural University1 Shizishan StreetHongshanDistrictWuhan 430070HubeiChina Agricultural Bioinformatics Key Laboratory of Hubei Province and HubeiEngineering Technology Research Center of Agricultural Big Data 3DGenomics Research CenterHuazhong Agricultural University1 ShizishanStreetHongshan DistrictWuhan 430070HubeiChina Department of Computer Science National University of SingaporeSingapore 117417Singapore Department of Computational and Systems Biology Genome Institute ofSingaporeSingapore 138672Singapore

Dear Editor,Rice(Oryza sativa)is one of the most important crops in the worldand a common model plant for genomic *** genomesofXian/IndicaandGeng/Japonicahave been completelysequenced and annotated with accurate genome *** the past few years,epigenomic information,including DNAmethylation,histone modification,and chromatin accessibility,has been characterized in theXian/IndicaandGeng/Japonicage-nomes(Zhao et al.,2020).Quite a few rice three-dimensionalgenome studies have been published in the meantime(Zhaoet al.,2019).However,it is still a big challenge for many groupsthat lack dedicated bioinformatic personnel or sufficientcomputational resources to utilize such epigenetic data.

关键词： sativa Oryza crops

Analysis of grinding mechanics and improved grinding force model based on randomized grain geometric characteristics

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Chinese Journal of Aeronautics 2023年第7期36卷 160-193页

作者： Mingzheng LIU Changhe LI Yanbin ZHANG Min YANG Teng GAO Xin CUI Xiaoming WANG wenhao xu Zongming ZHOU Bo LIU Zafar SAID Runze LI Shubham SHARMA School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266520China Hanergy(Qingdao)Lubrication Technology Co. LTDQingdao 266520China Sichuan Future Aerospace Industry LLC Shifang 618400China Department of Sustainable and Renewable Energy Engineering University of SharjahSharjah 27272United Arab Emirates Department of Biomedical Engineering University of Southern CaliforniaLos AngelesCA 90089–1111USA Department of Mechanical Engineering I.K.Gujral Punjab Technical UniversityJalandhar 144603India

Too high grinding force will lead to a large increase in specific grinding energy, resulting in high temperature in grinding zone, especially for the aerospace difficult cutting metal materials,seriously affecting the surface quality and accuracy. At present, the theoretical models of grinding force are mostly based on the assumption of uniform or simplified morphological characteristics of grains, which is inconsistent with the actual grains. Especially for non-engineering grinding wheel,most geometric characteristics of grains are ignored, resulting in the calculation accuracy that cannot guide practical production. Based on this, an improved grinding force model based on random grain geometric characteristics is proposed in this paper. Firstly, the surface topography model of CBN grinding wheel is established, and the effective grain determination mechanism in grinding zone is revealed. Based on the known grinding force model and mechanical behavior of interaction between grains and workpiece in different stages, the concept of grain effective action area is proposed. The variation mechanism of effective action area under the influence of grain geometric and spatial characteristics is deeply analyzed, and the calculation method under random combination of five influencing parameters is obtained. The numerical simulation is carried out to reveal the dynamic variation process of grinding force in grinding zone. In order to verify the theoretical model, the experiments of dry grinding Ti-6Al-4 V are designed. The experimental results show that under different machining parameters, the results of numerical calculation and experimental measurement are in good agreement, and the minimum error value is only 2.1 %, which indicates that the calculation accuracy of grinding force model meets the requirements and is feasible. This study will provide a theoretical basis for optimizing the wheel structure, effectively controlling the grinding force range, adjusting the grindi

关键词： Effective action area Grinding force Improved model Mechanical behaviour Randomized grain

Electrostatic atomization minimum quantity lubrication machining:from mechanism to application

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International Journal of Extreme Manufacturing 2022年第4期4卷 58-100页

作者： wenhao xu Changhe Li Yanbin Zhang Hafiz Muhammad Ali Shubham Sharma Runze Li Min Yang Teng Gao Mingzheng Liu Xiaoming Wang Zafar Said Xin Liu Zongming Zhou School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266520People's Republic of China State Key Laboratory of Ultra-Precision Machining Technology Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic UniversityHong KongPeople's Republic of China Mechanical Engineering Department King Fahd University of Petroleum and MineralsDhahran 31261Saudi Arabia Department of Mechanical Engineering IK Gujral Punjab Technical UniversityPunjab 144603India Department of Biomedical Engineering University of Southern CaliforniaLos AngelesCA 90089-1111United States of America College of Engineering University of SharjahSharjah 27272United Arab Emirates School of Mechanical Engineering Dalian University of TechnologyDalian 116024People's Republic of China Hanergy(Qingdao)Lubrication Technology Co.LTD Qingdao 266520People's Republic of China

Metal cutting fluids(MCFs)under flood conditions do not meet the urgent needs of reducing carbon ***-based minimum quantity lubrication(MQL)is an effective alternative to flood ***,pneumatic atomization MQL has poor atomization properties,which is detrimental to occupational ***,electrostatic atomization MQL requires preliminary exploratory ***,systematic reviews are lacking in terms of capturing the current research status and development direction of this *** study aims to provide a comprehensive review and critical assessment of the existing understanding of electrostatic atomization *** research can be used by scientists to gain insights into the action mechanism,theoretical basis,machining performance,and development direction of this ***,the critical equipment,eco-friendly atomization media(biolubricants),and empowering mechanisms of electrostatic atomization MQL are ***,the advanced lubrication and heat transfer mechanisms of biolubricants are revealed by quantitatively comparing MQL with MCF-based wet ***,the distinctive wetting and infiltration mechanisms of electrostatic atomization MQL,combined with its unique empowering mechanism and atomization method,are compared with those of pneumatic atomization *** experiments have shown that electrostatic atomization MQL can reduce tool wear by 42.4%in metal cutting and improve the machined surface Ra by 47%compared with pneumatic atomization ***,future development directions,including the improvement of the coordination parameters and equipment integration aspects,are proposed.

关键词： cutting grinding minimum quantity lubrication electrostatic atomization biolubricant