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A Novel Adaptive Kalman Filter Based on Credibility Measure

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IEEE/CAA Journal of Automatica Sinica 2023年第1期10卷 103-120页

作者： Quanbo ge Xiaoming Hu Yunyu Li Hongli He Zihao Song IEEE the School of Automation Nanjing University of Information Science and TechnologyNanjing 210044 Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment technology(CICAEEt) Nanjing University of Information Science&TechnologyNanjing 210044China KtH Royal Institute of technology Stockholm 10044Sweden the School of Automation Hangzhou Dianzi UniversityHangzhou 310000China the testing Institute Chinese Flight Test EstablishmentXi’an 710000China the School of Electrical and Automation Engineering East China Jiaotong UniversityNanchang 330000China

It is quite often that the theoretic model used in the Kalman filtering may not be sufficiently accurate for practical applications,due to the fact that the covariances of noises are not exactly *** previous work reveals that in such scenario the filter calculated mean square errors(FMSE)and the true mean square errors(tMSE)become inconsistent,while FMSE and tMSE are consistent in the Kalman filter with accurate *** can lead to low credibility of state estimation regardless of using Kalman filters or adaptive Kalman ***,it is important to study the inconsistency issue since it is vital to understand the quantitative influence induced by the inaccurate *** at this,the concept of credibility is adopted to discuss the inconsistency problem in this *** order to formulate the degree of the credibility,a trust factor is constructed based on the FMSE and the ***,the trust factor can not be directly computed since the tMSE cannot be found for practical *** on the definition of trust factor,the estimation of the trust factor is successfully modified to online estimation of the *** importantly,a necessary and sufficient condition is found,which turns out to be the basis for better design of Kalman filters with high ***,beyond trust factor estimation with Sage-Husa technique(tFE-SHt),three novel trust factor estimation methods,which are directly numerical solving method(tFE-DNS),the particle swarm optimization method(PSO)and expectation maximization-particle swarm optimization method(EM-PSO)are *** analysis and simulation results both show that the proposed tFE-DNS is better than the tFE-SHt for the case of single unknown noise ***,the proposed EMPSO performs completely better than the EM and PSO on the estimation of the credibility degree and state when both noise covariances should be estimated online.

关键词： Credibility expectation maximization-particle swarm optimization method(EM-PSO) filter calculated mean square errors(MSE) inaccurate models Kalman filter Sage-Husa true MSE(tMSE)

Study on magnetization reversal behavior for annealed Nd2Fe14B/α-Fe nancomposite alloys

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Journal of Rare Earths 2013年第8期31卷 759-764页

作者： ZHANG Pengyue PAN Minxiang ge Hongliang YUE Ming LIU Weiqiang College of Materials Science & Engineering China Jiliang University Hangzhou 310018 China College of Materials Science & Engineering Beijing University of Technology Beijing 100124 China

Effect of thermal annealing on the magnetization reversal behavior of α-Fe/Nd2Fe14B alloys was investigated. A drastic in- crease of the remanence Mr from 0.67 up to 0.87 t and remanence ratio Mr/Ms from 0.66 up to 0.76, respectively, was observed in the α-Fe/NdEFel413 alloys annealed at 610 ℃ as compared with the as-quenched sample. Whereas the further annealing at 680 ℃ resulted in a strong increase of the corecivity Hc as high as 491 kA/m but a slight decrease in Mr. the analysis result of the magnetization re- versal behavior showed that the maximum value of the integrated recoil loop area about 1.58 kJ/m3 was obtained in the α-Fe/Nd2Fe14B alloys at the annealing temperature of 610℃, significantly lower than other annealed samples. this indicated a sig- nificant advantage for the application of this material as permanent magnets in electrical machines and generators due to a low energy loss.

关键词： nanocomposite magnetization reversal behavior recoil loop rare earths

Life Cycle Assessment Analysis and Comparison of 1000 MW S-CO_(2)Coal Fired Power Plant and 1000 MW USC Water-Steam Coal-Fired Power Plant

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Journal of thermal Science 2022年第2期31卷 463-484页

作者： LI Mingjia WANG ge XU Jinliang NI Jingwei SUN Enhui Key Laboratory of thermo-Fluid Science and Engineering of Ministry of Education School of Energy&Power EngineeringXi’an Jiaotong UniversityXi’an 710049China Beijing Key Laboratory of Multiphase Flow and Heat transfer for Low Grade Energy Utilization North China Electric Power UniversityBeijing 102206China

the objective of this paper is to understand the benefits that one can achieve for large-scale supercritical CO_(2)(S-CO_(2))coal-fired power *** aspects of energy environment and economy of 1000 MW S-CO_(2)coal-fired power generation system and 1000 MW ultra-supercritical(USC)water-steam Rankine cycle coal-fired power generation system are analyzed and compared at the similar main vapor parameters,by adopting the neural network genetic algorithm and life cycle assessment(LCA)***-objective optimization of the 1000 MW S-CO_(2)coal-fired power generation system is further carried *** power generation efficiency,environmental impact load,and investment recovery period are adopted as the objective *** main vapor parameters of temperature and pressure are set as the decision *** results are concluded as ***,the total energy consumption of the S-CO_(2)coal-fired power generation system is 10.48 MJ/k Wh and the energy payback ratio is 34.37%.the performance is superior to the USC coal-fired power generation ***,the resource depletion index of the S-CO_(2)coal-fired power generation system is 4.38μPRchina,90,which is lower than that of the USC coal-fired power generation system,and the resource consumption is ***,the environmental impact load of the S-CO_(2)coal-fired power generation system is 0.742 m PEchina,90,which is less than that of the USC coal-fired power generation system,0.783 m PEchina,*** all environmental impact types,human toxicity potential HtP and global warming potential GWP account for the most environmental ***,the investment cost of the S-CO_(2)coal-fired power generation system is generally less than that of the USC coal-fired power generation system because the cost of the S-CO_(2)turbine is only half of the cost of the steam *** optimal turbine inlet temperature t_(5)becomes smaller,and the optimal turbine inlet pressure is unchanged at 622.082°C/30 MPa.

关键词： S-CO_(2)power plant ultra-supercritical water-steam Rankine cycle power plant life cycle assessment energy efficiency environment impact economic performance

Rate constants for the reaction of ozone with n-butyl, s-butyl and t-butyl methyl sulfides

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Chinese Science Bulletin 2008年第23期53卷 3620-3625页

作者： WANG Kun DU Lin ge MaoFa Beijing National Laboratory for Molecular Sciences (BNLMS) and State Key Laboratory for Structural Chemistry of Unstable and Stable Species Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China Graduate University of the Chinese Academy of Sciences Beijing 100039 China

the rate constants for the ozone reactions with n-butyl methyl sulfide (n-BMS, CH3CH2CH2CH2SCH3), sec-butyl methyl sulfide (s-BMS, CH3CH2(CH3)CHSCH3) and tert-butyl methyl sulfide (t-BMS, (CH3)3CSCH3) were measured using our smog chamber under supposedly pseudo-first-order conditions at 300±2 K and 760 torr. the experimental determined rate constants for n-butyl, s-butyl and t-butyl methyl sulfide are (1.23 ± 0.06)×10-19, (5.08 ± 0.19)×10?20 and (2.26 ± 0.14)×10?20 cm3·molecule-1·s-1, respectively. the reactivity-structure relationship of the reactions was discussed and used to illustrate the mechanism of the ozone reaction with thioethers. the results enrich the kinetics data of atmospheric chemistry.

关键词：丁基甲基硫化物臭氧动力学

Convergence Analysis and Error Estimate for Distributed Optimal Control Problems Governed by Stokes Equations with Velocity-Constraint

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Advances in Applied Mathematics and Mechanics 2022年第1期14卷 33-55页

作者： Liang ge Haifeng Niu Jianwei Zhou School of Mathematical Sciences University of JinanJinan 250022ShandongChina School of Mathematics and Information Science Henan Polytechnic UniversityJiaozuo 454000HenanChina School of Mathematics and Statistics Linyi UniversityLinyi 276005ShandongChina Division of Applied and Computational Mathematics Beijing Computational Science Research CenterBeijing 100193China

In this paper,spectral approximations for distributed optimal control problems governed by the Stokes equation are *** the constraint set on velocity is stated with *** conditions of the continuous and discretized systems are deduced with the Karush-Kuhn-tucker conditions and a Lagrange multiplier depending on the *** solve the equivalent systems with high accuracy,Galerkin spectral approximations are employed to discretize the constrained optimal control ***,we adopt a parameter l in the pressure approximation space,which also guarantees the inf-sup condition,and study a priori error estimates for the velocity and ***,an efficient algorithm based on the Uzawa algorithm is proposed and its convergence results are investigated with rigorous *** experiments are performed to confirm the theoretical results.

关键词： Optimal control spectral approximation Stokes equation convergence analysis

Noncoding RNAs:Different roles in tumorigenesis

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Chinese Science Bulletin 2012年第9期57卷 959-965页

作者： LIN Mei WU Jing SHAN ge School of Life Sciences University of Science and Technology of China Hefei 230026 China School of Life Science and technology Huazhong University of Science and Technology Wuhan 430074 China

A major portion of the mammalian genome is transcribed to produce large numbers of noncoding RNAs(ncRNAs).During the past decade,the discovery of small RNAs,including the microRNAs(miRNA) and small interfering RNAs(siRNA),has led to important advances in *** breadth of the ncRNA field of study has substantially expanded and many recent results have revealed a range of functions that can be attributed to the miRNAs and other *** example,H19 RNA,HOtAIR RNA,transcribed ultraconserved regions(t-UCRs),natural antisense RNA,transfer RNA and mitochondrial noncoding RNA have been suggested to play important roles in cancers and other diseases as well as in diverse cellular *** this review,we focus on the current status of several classes of ncRNAs associated with cancer with the emphasis on those that are not microRNAs.

关键词：非编码RNA 小分子RNA miRNAs RNA干扰肿瘤反义RNA 哺乳动物核糖核酸

Detection of t-wave Alternans in ECG Signals Using FRFt and tensor Decomposition

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Journal of Beijing Institute of technology 2021年第3期30卷 290-294页

作者： Chuanbin ge Shuli Zhao Yi Xin School of Life Science Beijing Institute of TechnologyBeijing 100081China Medical Supplies Center of Chinese PLA general Hospital Beijing 100036China

t-wave alternans(tWA)refers to the periodic beat-to-beat variation in the amplitude of t-wave in the electrocardiogram(ECG)signal in an *** has been proven to be a very important indicator of malignant arrhythmia risk stratification.A new method to detect tWA by combining fractional Fourier transform(FRFt)and tensor decomposition is ***,the t-wave vector is extracted from the ECG of each heartbeat,and its FRFt amplitudes at multiple orders are arranged to form a t-wave ***,a third-order tensor is composed of t-wave matrices of several consecutive heart *** tensor decomposition,projection matrices are obtained in three *** complexity of the projection matrix is measured by Shannon entropy to obtain feature vector to detect the presence of *** show that the sensitivity,specificity,and accuracy of the algorithm on the MIt-BIH database are 91.16%,94.25%,and 92.68%,*** method effectively utilizes the fractional domain information of ECG,and shows the promising potential of the FRFt in ECG signal processing.

关键词： t-wave alternans(tWA) electrocardiogram(ECG) fractional Fourier transform tensor decomposition

Acyclic 6-choosability of planar graphs without adjacent short cycles

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Science China Mathematics 2014年第1期57卷 197-209页

作者： WANG WeiFan ZHANG ge CHEN Min Department of Mathematics Zhejiang Normal University

A proper vertex coloring of a graph G is acyclic if G contains no bicolored *** a list assignment L={L(v)|v∈V}of G,we say that G is acyclically L-colorable if there exists a proper acyclic coloringπof G such thatπ(v)∈L(v)for all v∈*** G is acyclically L-colorable for any list assignment L with|L(v)|k for all v∈V(G),then G is acyclically *** this paper,we prove that every planar graph G is acyclically 6-choosable if G does not contain 4-cycles adjacent to i-cycles for each i∈{3,4,5,6}.this improves the result by Wang and Chen(2009).

关键词： acyclic coloring acyclic choosability planar graph 05C15

trachytic Rock and Associated Fenitization in the Bayan Obo Ore Deposit,Inner Mongolia,China:Evidence for Magmatic-Hydrothermal Mineralization Related to a Carbonatitic Complex

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Acta geologica Sinica(English Edition) 2000年第2期74卷 148-153页

作者： YUAN Zhongxin BAI ge ZHANG Zongqing Institute of Mineral Deposits Chinese Academy of Geological Sciences26 Baiwanzhuang Rd.Beijing 100037 Institute of geology Chinese Academy of geological Sciences 26 Baiwanzhuang Rd.Beijing 100037

trachytic rock and its altered rock—fenite—in the Bayan Obo ore district, Inner Mongolia, China, were referred to as slate or feldspar rock before, and identified by the authors for the first time (in 1992). In the paper the mineral assemblages, structures and textures and petrochemical compositions of the rocks, as well as the electron microprobe analysis of feldspars in the rocks are described. the Sm-Nd isochron age of the trachytic rock is 1096 ± 56 Ma, with INd=0.51100±4 (2 s?) and ?Nd(t)= ?4.4 ± 0.7. Alterations of the trachytic rock, including microclinization, riebeckitization, aegirinization and biotitization, and accompanied rare element and REE mineralizations are discussed. Based on the occurrence of the trachytic rock and associated fenitization it is deduced that the Bayan Obo Fe-Nb-REE ore deposit is genetically related to magmatic-hydrothermal activity of an alkali carbonatite complex.

关键词： trachytic rock fenitization Bayan Obo