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Subspace Identification for Closed-Loop Systems With Unknown Deterministic Disturbances

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IEEE/CAA Journal of Automatica Sinica 2023年第12期10卷 2248-2257页

作者： kuan Li Hao Luo Yuchen Jiang Dejia Tang Hongyan yang IEEE Shanghai Aerospace Control Technology Institute Shanghai 201109China the Control and Simulation Center School of AstronauticsHarbin Institute of TechnologyHarbin 150006China the Faculty of Information Technology Engineering Research Center of Digital CommunityMinistry of EducationBeijing University of TechnologyBeijing 100124China

This paper presents a subspace identification method for closed-loop systems with unknown deterministic disturbances.To deal with the unknown deterministic disturbances,two strategies are implemented to construct the row space that can be used to approximately represent the unknown deterministic disturbances using the trigonometric functions or Bernstein polynomials depending on whether the disturbance frequencies are known.For closed-loop identification,CCF-N4SID is extended to the case with unknown deterministic disturbances using the oblique projection.In addition,a proper Bernstein polynomial order can be determined using the Akaike information criterion(AIC)or the Bayesian information criterion(BIC).Numerical simulation results demonstrate the effectiveness of the proposed identification method for both periodic and aperiodic deterministic disturbances.

关键词： Bernstein polynomial closed-loop system subspace identification unknown deterministic disturbances

Simultaneous optimization of phononic and electronic transport in two-dimensional Bi2O2Se by defect engineering

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Science China(Information Sciences) 2023年第6期66卷 87-93页

作者： Fang yang Hong kuan NG Jing WU Yunshan ZHAO Junpeng LU School of Physics Southeast University Institute of Materials Research and Engineering Agency for ScienceTechnology and Research NNU-SULI Thermal Energy Research Center (NSTER) & Center for Quantum Transport and Thermal Energy Science (CQTES) School of Physics and TechnologyNanjing Normal University

Defect engineering represents one degree of freedom to tune the physical and chemical properties of two-dimensional (2D)materials.Here,we demonstrate that the thermal and electronic properties of 2D Bi2O2Se can be optimized simultaneously by introducing oxygen defects.2D Bi2O2Se and its oxygendeficient counterpart (Bi2Ox Se,x<2)can be controllably synthesized by the chemical vapor deposition(CVD)method.By introducing oxygen defects,the thermal conductivity of 2D Bi2O2Se is reduced by nearly three times,achieving an extremely low thermal conductivity of 0.68±0.06 W/mK at room temperature via the thermal bridge technique.This low thermal conductivity is enabled by the scattering of phonons by targeting of high-,mid-,and low-frequency phonons due to oxygen defects,strong anharmonicity,and nanostructure boundaries,respectively.Meanwhile,the mobility is also improved to 260–500 cm2·V-1·s-1and the usual polar optical phonon scattering in 2D Bi2O2Se is weakened owing to the introduction of oxygen defects.Our results promise potential applications for thermoelectric design,nanoelectronics,and thermal barrier coating devices based on emerging 2D materials.

关键词： 2D Bi 2 O 2 Se thermal conductivity oxygens defects phonon scattering mobility

Designing topological and correlated 2D magnetic states via superatomic lattice constructions of zirconium dichloride

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Nano Research 2023年第12期16卷 13509-13515页

作者： yang Song Wen-Han Dong kuan-Rong Hao Shixuan Du Lizhi Zhang Laboratory of Theoretical and Computational Nanoscience National Center for Nanoscience and TechnologyBeijing 100190China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China

Magnetic materials could realize the intriguing quantum anomalous Hall effect and metal-to-insulator transition when combined with band topology or electronic correlation,which have broad prospects in quantum information,spintronics,and valleytronics.Here,we propose the approach of designing novel two-dimensional(2D)magnetic states via d-orbital-based superatomic lattices.Specifically,we chose triangular zirconium dichloride disks as superatoms to construct the honeycomb superatomic lattices.Using first-principles calculations,we identified a series of 2D magnetic states with varying sizes of superatoms.We found the non-uniform stoichiometries and geometric effect of superatomic lattice give rise to spin-polarized charges arranged in different magnetic configurations,containing ferromagnetic coloring triangles,antiferromagnetic honeycomb,and ferromagnetic kagome lattices.Attractively,these magnetic states are endowed with nontrivial band topology or strong correlation,forming an ideal Chern insulator or antiferromagnetic Dirac Mott insulator.Our work not only reveals the potential of d-orbital-based superatoms for generating unusual magnetic configurations,but also supplies a new avenue for material engineering at the nanoscale.

关键词： topological state Chern insulator Dirac Mott insulator zirconium dichloride superatomic lattice kagome lattice

Three-dimensional modeling in complex liver surgery and liver transplantation

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Hepatobiliary & Pancreatic Diseases International 2022年第4期21卷 318-324页

作者： Jian-Peng Liu Jan Lerut Zhe yang Ze-kuan Li Shu-Sen Zheng Department of Hepatobiliary and Pancreatic Surgery Department of Liver TransplantationShulan(Hangzhou)HospitalZhejiang Shuren University School of MedicineHangzhou 310000China Starzl Unit of Abdominal Transplantation University Hospitals Saint LucUniversitécatholique LouvainBrusselsBelgium Division of Hepatobiliary Pancreatic Surgery the First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003China National Clinical Research Center of Infectious Diseases Hangzhou 310003China

Liver resection and transplantation are the most effective therapies for many hepatobiliary tumors and diseases.However,these surgical procedures are challenging due to the anatomic complexity and many anatomical variations of the vascular and biliary structures.Three-dimensional(3D)printing models can clearly locate and describe blood vessels,bile ducts and tumors,calculate both liver and residual liver volumes,and finally predict the functional status of the liver after resection surgery.The 3D printing models may be particularly helpful in the preoperative evaluation and surgical planning of especially complex liver resection and transplantation,allowing to possibly increase resectability rates and reduce postoperative complications.With the continuous developments of imaging techniques,such models are expected to become widely applied in clinical practice.

关键词： 3D printing models Liver surgery Liver transplantation

Hubble parameter estimation via dark sirens with the LISA-Taiji network

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National Science Review 2022年第2期9卷 52-62页

作者： Renjie Wang Wen-Hong Ruan Qing yang Zong-kuan Guo Rong-Gen Cai Bin Hu Department of Astronomy Beijing Normal University CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences College of Engineering Physics Shenzhen Technology University School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences

The Hubble parameter is one of the central parameters in modern cosmology,and describes the present expansion rate of the universe.The values of the parameter inferred from late-time observations are systematically higher than those inferred from early-time measurements by about 10%.To reach a robust conclusion,independent probes with accuracy at percent levels are crucial.Gravitational waves from compact binary coalescence events can be formulated into the standard siren approach to provide an independent Hubble parameter measurement.The future space-borne gravitational wave observatory network,such as the LISA-Taiji network,will be able to measure the gravitational wave signals in the millihertz bands with unprecedented accuracy.By including several statistical and instrumental noises,we show that,within a five-year operation time,the LISA-Taiji network is able to constrain the Hubble parameter within 1% accuracy,and possibly beats the scatters down to 0.5% or even better.

关键词： gravitational waves Hubble parameter super massive black hole

Effects of zero-valent iron added in the flooding or drainage process on cadmium immobilization in an acid paddy soil

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Journal of Environmental Sciences 2024年第4期138卷 19-31页

作者： Hanbing Meng Shiwen Hu Zebin Hong Wenting Chi Guojun Chen kuan Cheng QiWang Tongxu Liu Fangbai Li Kexue Liu yang yang Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementInstitute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China School of Resources and Planning Guangzhou Xinhua UniversityGuangzhou 510310China University of Chinese Academy of Sciences Beijing 100049China

Zero-valent iron(ZVI)is a promising material for the remediation of Cd-contaminated paddy soils.However,the effects of ZVI added during flooding or drainage processes on cadmium(Cd)retention remain unclear.Herein,Cd-contaminated paddy soil was incubated for 40days of flooding and then for 15 days of drainage,and the underlying mechanisms of Cd immobilization coupled with Fe/S/N redox processes were investigated.The addition of ZVI to the flooding process was more conducive to Cd immobilization.Less potential available Cd was detected by adding ZVI before flooding,which may be due to the increase in paddy soil pH and newly formed secondary Fe minerals.Moreover,the reductive dissolution of Fe minerals promoted the release of soil colloids,thereby increasing significantly the surface sites and causing Cd immobilization.Additionally,the addition of ZVI before flooding played a vital role in Cd retention after soil drainage.In contrast,the addition of ZVI in the drainage phase was not conducive to Cd retention,which might be due to the rapid decrease in soil pH that inhibited Cd adsorption and further immobilization on soil surfaces.The findings of this study demonstrated that Cd availability in paddy soil was largely reduced by adding ZVI during the flooding period and provide a novel insight into the mechanisms of ZVI remediation in Cd-contaminated paddy soils.

关键词： Paddy soil Zero-valent iron Cadmium Flooding and drainage Remediation

Optimization of vinegar-steaming process for Wuweizi (Fructus Schisandrae Chinensis) with response surface method

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Journal of Traditional Chinese Medicine 2013年第5期33卷 682-685页

作者： Yan Zhang Kangwei Li Kuan Yang Xing Fan Mengxin Zhang Teaching and Research Section of Pharmacognosy of Pharmacy Department Xi'an Medical University

OBJECTIVE:To optimize the vinegar-steaming process of Wuweizi(Fructus Schisandrae Chinensis)using the response surface method(RSM)based on the Box-Behnken design.METHODS:A regression model was constructed with the response variables,the content of Deoxyschizandrin,and the three explanatory factors:length of steaming time,the quantity of vinegar and length of moistening time to evaluate the effects on the processing of Wuweizi(Fructus SchisandraeChinensis).RESULTS:There was a linear relationship between the content of Deoxyschizandrin and the three explanatory factors.When the steaming time was5.49 h,with 2.365 g of vinegar added and a moistening time of 4.13 h,the content of Deoxyschizandrin reached the maximum predicted value of0.1076%,and under the conditions the average content of Deoxyschizandrin was 0.1058%.CONCLUSION:The correlation coefficient of thenonlinear mathematical model was relatively high and the model matched the data well,potentially providing a method for the study of the steaming process.

关键词：五味子甲素响应曲面法优化枳壳醋润湿时间羊草工艺

Surface modification of Li_(3)InCl_(6)provides superior electrochemical performance for LiMn_(2)O_(4)cathode materials

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Chinese Chemical Letters 2023年第5期34卷 505-508页

作者： Yixun Gu Kuan Yang Hongbin Yao Weijian Li Haiqing Zhan Xianquan Ming Guanhan Huang Guiliang Li Feng Zhan School of Resources Environment and Materials Guangxi UniversityNanning 530004China South Manganese Group Limited Nanning 530000China

Li Mn_(2)O_(4)(LMO)is the substance of choice for small and medium-sized energy storage materials in daily life.In this work,Li3InCl6(LIC)is prepared on the surface of LiMn_(2)O_(4)by hydrothermal method using InCl_(3)and LiCl as raw materials.This method stabilizes the LMO crystal structure by uniformly coating the LIC on the LMO surface and effectively maintains the morphology of LMO crystals during the cycling process.SEM and EDS analysis confirm the morphology and homogeneity of the synthesized material LIC on the LMO surface.The prepared material is put into a battery,and the charge-discharge test is carried out at 0.5 C and 1 C.The results show that the LIC surface-modified samples exhibit more than 6%higher cycling performance than the unmodified samples after long cycling.

关键词： Li-ion batteries Cathode material LiMn_(2)O_(4) Li_(3)InCl_(6) Surface modification

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辽西地区史前斧钺研究

北方文物 2023年第4期 79-86页

作者：杨宽安阳师范学院历史与文博学院

在史前斧钺研究中,“钺”的判定标准并不统一,导致钺的认定存在随意性。选定时空背景明确的辽西斧钺为研究对象,采取由已知到未知的推理方式,通过总结后世钺的文化内涵,确定史前斧和钺的判定标准。研究表明,辽西存在两种类型的“钺”:... 详细信息

在史前斧钺研究中,“钺”的判定标准并不统一,导致钺的认定存在随意性。选定时空背景明确的辽西斧钺为研究对象,采取由已知到未知的推理方式,通过总结后世钺的文化内涵,确定史前斧和钺的判定标准。研究表明,辽西存在两种类型的“钺”:一类是基于对社会生产力的重视,从本土文化的斧演化而来;另一类是从红山文化开始与域外的文化互动中产生,具有一定的社会与政治意义。两类钺的发展过程显示了辽西史前社会早期本土文化主导、中晚期与域外文化互动的文明化进程。

关键词：辽西地区史前斧钺文明起源