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Design and Analysis of a Magnetic Bearings with Three Degrees of Freedom

Chinese Journal of Mechanical Engineering 2019年第1期32卷 142-151页

作者： Ye yuan Yukun Sun Qianwen xiang School of Electrical and Information Engineering Jiangsu University College of Electrical Engineering Nanjing Institute of Technology

The current research of supporting and transmission system in flywheel energy storage system(FESS) focuses on the low consumption design. However, friction loss is a non-negligible factor in the high-speed but lightweight FESS energy and momentum storage with mechanical-type supporting system. In order to realize the support system without mechanical loss and to maximize the e ciency of the flywheel battery, a permanent magnet biased magnetic bearings(PMBMB) is applied to the FESS with the advantages of low loss, high critical speed, flexible controllability and compact structure. In this frame, the relevant research of three degrees of freedom(3-DOF) PMBMB for a new type FESS is carried out around the working principle, structural composition, coupling characteristics analysis, mathematical model, and structural design. In order to verify the performance of the 3-DOF PMBMB, the radial force mathematical model and the coupling determination equations of radial two DOF are calculated according to an equivalent magnetic circuit, and radial–axial coupling is analyzed through finite element analysis. Moreover, a control system is presented to solve the control problems in practical applications. The rotor returns to the balanced position in 0.05 s and maintains stable suspension. The displacement fluctuation is approximately 40 μm in the y direction and 30 μm in the x direction. Test results indicate that the dynamic rotor of the proposed flywheel energy storage system with PMBMB has excellent characteristics, such as good start-of-suspension performance and stable suspension characteristics. The proposed research provides the instruction to design and control a low loss support system for FESS.

关键词： Flywheel energy storage system Magnetic bearings Degrees of freedom Coupling Finite element analysis

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CMW-Net: an adaptive robust algorithm for sample selection and label correction

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National Science Review 2023年第6期10卷 19-23页

作者： Jun Shu xiang yuan Deyu Meng School of Mathematics and Statistics Xi'an Jiaotong University Ministry of Education Key Lab of Intelligent Networks and Network Security Xi'an Jiaotong University Peng Cheng Laboratory Pazhou Laboratory (Huangpu)

PROBLEM Deep neural networks (DNNs) have recently achieved impressive performance in various *** successis largely attributed to massive but carefully labeled data expected to properly and sufficiently simulate testing ***,the data collection and annotation processes are often expensiveand time consuming,making obtained training datasets in real-life applications error prone,especially with data biasfrom ideal testing distributions.

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Combination of ionic liquid dispersive liquid-phase microextraction and high performance liquid chromatography for the determination of triazine herbicides in water samples

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Chinese Chemical Letters 2014年第5期25卷 745-748页

作者： Qing-xiang Zhou yuan-yuan Gao College of Geosciences China University of Petroleum Beijing College of Environmental Science and Engineering Nankai University

A temperature-controlled ionic liquid dispersive liquid-phase microextraction in combination with high performance liquid chromatography was developed for the enrichment and determination of triazine herbicides such as cyanazine,simazine,and atrazine in water samples.1-Octyl-3-methylimidazolium hexafluorophosphate（[C8MIM][PF6]） was selected as the extraction *** experimental parameters were *** the optimal conditions,the linear range for cyanazine was in the concentration range of 0.5–80 mg/L and the linear range for simazine and atrazine was in the range of1.0–100 mg/*** limit of detection（LOD,S/N = 3） was in the ranges of 0.05–0.06 mg/L,and the intra day and inter day precision（RSDs,n = 6） was in the ranges of 3.2%–6.6% and 4.8%–8.9%,*** real water samples were analyzed with the developed method,and the experimental results showed that the spiked recoveries were *** these exhibited that the developed method was a valuable tool for monitoring such pollutants.

关键词： Temperature-controlled ionic liquid dispersive liquid-phase microextraction Ionic liquid Triazine herbicides High performance liquid chromatography

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The Global Well-posedness of Strong Solutions to 2D MHD Equations in Lei-Lin Space

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Acta Mathematicae Applicatae Sinica 2023年第3期39卷 647-655页

作者： Bao-quan yuan ya-min XIAO School of Mathematics and Information Science Henan Polytechnic UniversityJiaozuo 454000China

In this paper, we study the Cauchy problem of the 2D incompressible magnetohydrodynamic equations in Lei-Lin space. The global well-posedness of a strong solution in the Lei-Lin space χ^(-1)(R^(2)) with any initial data in χ^(-1)(R^(2)) ∩ L^(2)(R^(2)) is established. Furthermore, the uniqueness of the strong solution in χ^(-1)(R^(2)) and the Leray-Hopf weak solution in L^(2)(R^(2)) is proved.

关键词： 2D MHD equations strong solutions Lei-Lin space weak-strong uniqueness

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An on-line solid phase extraction-liquid chromatography tandem mass spectrometry method for the determination of perfluoroalkyl substances in the Antarctic ice core samples

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Chinese Chemical Letters 2015年第9期26卷 1073-1078页

作者： ya-Li Shi yuan-yuan Pan Li-Na Liang ya-Qi Cai State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental ScienceChinese Academy of Sciences Thermo Fisher Scientific(China)Co. Ltd.

An on-line solid phase extraction-high performance liquid chromatography-tandem mass spectrometry method for the analysis of perfluoroalkyl substances（PFASs） in water samples was *** optimal analytical conditions were obtained through the optimization of the extraction efficiency of online solid phase extraction column,sample loading rate and loading volume,and the concentration of ammonium acetate in mobile *** the optimal condition,the analytical method displayed good linearity（r^2〉0.99） for 12 PFASs（C5-C14 perfluoroalkyl carboxylic acids and C6/C8 perfluoroalkyl sulfonic acids） over a concentration range of 0.5-100 ng/*** limits of quantitation for samples were between 0.025 ng/L and 0.5 ng/L and the relative standard deviations（RSD） of five consecutive analyses were less than 10%for 1 ng/L standard *** results were obtained using this analytical method for the analysis of perfluoroalkyl substances in Antarctic ice core *** recoveries of all perfluoroalkyl substances were in a range of 73%-117%when the samples were spiked with standards at the concentrations of 2.5 ng/L and 25 ng/L.

关键词： Perfluoroalkyl substances On-line solid phase extraction LC-MS/MS Antarctic ice cores

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On the Generalization of the *** Problem

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Acta Mathematica Sinica,English Series 2009年第8期25卷 1269-1274页

作者： ya Ming LU yuan YI Research Center for Basic Science Xi'an Jiaotong University Xi'an 710049 P. R. China

Let n ≥ 2 be a fixed positive integer, q ≥ 3 and c be two integers with （n, q） = （c, q） = 1. We denote by rn（51, 52, C; q）（δ 〈 δ1,δ2≤ 1） the number of all pairs of integers a, b satisfying ab ≡ c（mod q）, 1 〈 a ≤δ1q, 1 ≤ b≤δ2q, （a,q） = （b,q） = 1 and nt（a＋b）. The main purpose of this paper is to study the asymptotic properties of rn （δ1, δ2, c; q）, and give a sharp asymptotic formula for it.

关键词： D. H. Lehmer problem Gauss sum Kloosterman sum

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Multilinear Singular Integral Operators with Generalized Kernels and Their Multilinear Commutators

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Acta Mathematica Sinica,English Series 2017年第11期33卷 1443-1462页

作者： yan LIN ya yuan XIAO School of Sciences China University of Mining and Technology Department of Mathematical Sciences Ball State University

In this paper, the authors study a class of multilinear singular integral operators with generalized kernels and their multilinear commutators with BMO functions. By establishing the sharp maximal estimates, the boundedness on product of weighted Lebesgue spaces and product of variable exponent Lebesgue spaces is obtained, respectively. Moreover, the endpoint estimate of this class of mutilinear singular integral operators is also established. These results can improve the corresponding known results of classical multilinear Calder6n-Zygmund operators and multilinear Calderon-Zygmund operators with Dini type kernels.

关键词： Multilinear singular integral sharp maximal function multilinear commutator BMO function

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A Note on the Lehmer Problem over Short Intervals

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Acta Mathematica Sinica,English Series 2011年第6期27卷 1115-1120页

作者： ya Ming LU yuan YI School of Science Xi'an Jiaotong University Xi'an 710049 P. R. China

Let p be an odd prime, c be an integer with （c,p） = 1, and let N be a positive integer withN ≤ p - 1. Denote by r（N, c;p） the number of integers a satisfying 1 ≤ a ≤ N and 2 a ＋ a, where a is an integer with 1 ≤a≤ p - 1, aa ≡ c （mod p）. It is well known that r（N, c;p） = 1/2N ＋ O（p1/2log2p）.The main purpose of this paper is to give an asymptotic formula for ∑p-1 c=1（τ（N,c;p）-1/2N）2.

关键词： Lehmer problem character sum Dirichlet L-function

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Direct synthesis of diaryl sulfides by copper-catalyzed coupling of aryl halides with aminothiourea

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Chinese Chemical Letters 2012年第4期23卷 391-394页

作者： xiang Mei Wu Wei ya Hu Department of Chemistry College of ScienceLishui UniversityLishui 323000China

An efficient and simple protocol of copper-catalyzed C-S bond formation between aryl halides and inexpensive and commercially available aminothiourea is reported.A variety of symmetrical diaryl sulfides can be synthes... 详细信息

关键词： Copper Diaryl sulfide Aryl halide Aminothiourea

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Transcriptome-based analysis of key genes and pathways affecting the linoleic acid content in chickens

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Journal of Integrative Agriculture 2023年第12期22卷 3744-3754页

作者： ZHAO Wen-juan yuan Xiao-ya xiang Hai MA Zheng CUI Huan-xian LI Hua ZHAO Gui-ping Guangdong Provincial Key Laboratory of Animal Molecular Design and Precise Breeding Foshan UniversityFoshan 528000P.R.China Institute of Animal Science Chinese Academy of Agricultural SciencesBeijing 100193P.R.China

Linoleic acid is an essential polyunsaturated fatty acid that cannot be synthesized by humans or animals themselves and can only be obtained *** amount of linoleic acid present has an impact on the quality and flavour of meat and indirectly affects consumer ***,the molecular mechanisms influencing the deposition of linoleic acid in organisms are not *** the molecular mechanisms of linoleic acid deposition are not well understood,to investigate the main effector genes affecting the linoleic acid content,this study aimed to screen for hub genes in slow-type yellow-feathered chickens by transcriptome sequencing(RNA-Seq)and weighted gene coexpression network analysis(WGCNA).We screened for candidate genes associated with the linoleic acid content in slow-type yellow-feathered broilers.A total of 399 Tiannong partridge chickens were slaughtered at 126 days of age,fatty acid levels were measured in pectoral muscle,and pectoral muscle tissue was collected for transcriptome *** sequencing results were combined with phenotypes for WGCNA to screen for candidate *** enrichment analysis was also performed on the genes that were significantly enriched in the modules with the highest correlation.A total of 13310 genes were identified after quality control of transcriptomic data from 399 pectoral muscle *** was performed,and a total of 26 modules were obtained,eight of which were highly correlated with the linoleic acid *** key genes,namely,MDH2,ATP5B,RPL7A and PDGFRA,were screened according to the criteria|GS|>0.2 and|MM|>*** functional enrichment results showed that the genes within the target modules were mainly enriched in metabolic *** this study,a large-sample-size transcriptome analysis revealed that metabolic pathways play an important role in the regulation of the linoleic acid content in Tiannong partridge chickens,and MDH2,ATP5B,RPL7A and PDGFRA were screened as important candidate

关键词： chicken linoleic acid transcriptome sequencing weighted gene coexpression network analysis(WGCNA) metabolic pathways

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