检索结果-南通市图书馆

Tuning of Sampled-Data ADRC for Nonlinear Uncertain Systems

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2016年第5期29卷 1187-1211页

作者： xue Wenchao HUANg Yi Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy of Sciences

This paper concerns with the parameters tuning of active disturbance rejection control(ADRC) for a class of nonlinear systems with sampling rate not fast enough. The theoretical results show the quantitative relationship between the sampling rate, the parameters of ADRC, the size of uncertainties in system and the properties of the closed-loop system. furthermore, the capability of the sampled-data ADRC under given sampling rate is quantitatively discussed.

关键词： Active disturbance rejection control (ADRC) extended state observer nonlinear uncertain systems parameters tuning sampled-data control.

Anomaly detection by exploiting the tracking trajectory in surveillance videos

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2020年第5期63卷 197-199页

作者： Zixuan xue Wei WU faculty of Information Technology Beijing University of Technology State Key Laboratory of Virtual Reality Technology and Systems Beihang University

Surveillance systems have become increasingly ubiquitous, which has led to a requirement to detect anomalies for efficiently preventing terrorism and reducing crimes. The increasing number of surveillance networks has imposed major technical challenges on intelligent anomaly detection because of the inconsistent appearance of pedestrians owing to posture deformation and clutter in video

关键词： Anomaly detection by exploiting the tracking trajectory in surveillance videos frame

greedy Optimization for K-Means-Based Consensus Clustering

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2018年第2期23卷 184-194页

作者： xue Li Hongfu Liu School of Economics and Management Tsinghua University Beijing 100084 China. Department of Electrical and Computer Engineering Northeastern University Boston MI 02115 USA.

Consensus clustering aims to fuse several existing basic partitions into an integrated one; this has been widely recognized as a promising tool for multi-source and heterogeneous data clustering. Owing to robust and high-quality performance over traditional clustering methods, consensus clustering attracts much attention, and much efforts have been devoted to develop this field. In the literature, the K-means-based Consensus Clustering(KCC) transforms the consensus clustering problem into a classical K-means clustering with theoretical supports and shows the advantages over the state-of-the-art methods. Although KCC inherits the merits from K-means,it suffers from the initialization sensitivity. Moreover, the current consensus clustering framework separates the basic partition generation and fusion into two disconnected parts. To solve the above two challenges, a novel clustering algorithm, named greedy optimization of K-means-based Consensus Clustering(gKCC) is *** by the well-known greedy K-means that aims to solve the sensitivity of K-means initialization, gKCC seamlessly combines greedy K-means and KCC together, achieves the merits inherited by gKCC and overcomes the drawbacks of the precursors. Moreover, a 59-sampling strategy is conducted to provide high-quality basic partitions and accelerate the algorithmic speed. Extensive experiments on 36 benchmark datasets demonstrate the significant advantages of gKCC over KCC and KCC++ in terms of the objective function values and standard deviations and external cluster validity.

关键词： K-means consensus clustering initialization greedy optimization

Releasing characteristics of phosphorus and other substances during thermal treatment of excess sludge

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2007年第10期19卷 1153-1158页

作者： xue Tao HUANg Xia Department of Environmental Science and Engineering State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua University Beijing 100084 China

The releasing characteristics of phosphorus, nitrogen compounds, organics, and some metal cations during thermal treatment of excess sludge were investigated. It was found that during heating not only phosphorus, but also nitrogen compounds, organics, and some metal cations could be released in abundance. The maximum orthophosphate （ortho-P） release of about 90 mg/L in concentration was observed at 50℃ in 1 h. Except for volatile fatty acids （VfAs）, comparatively little total nitrogen （TN）, total organic carbon （TOC）, and metal cations were released at the same time. Such results might favor further process of phosphorus recovery. VfAs were considerably released only at 50℃. Acetic, butyric, and propionic acid were the most abundant components in turn and their releasing profiles exhibited good linear relationship with time （R2 = 0.9977, 0.9624, and 0.8908, respectively）. The concentrations of Mg^2＋ and K^＋ increased with time and temperature during thermal treatment, but Ca^2＋ decreased. The release of Mg^2＋ and K^＋ agreed well with TP release （R^2 = 0.9892 and 0.9476, respectively）. Temperature in the experimental range had very little impact on the linear relationships, especially of Mg^2＋. Moreover, the parameter of mixed liquor suspended solids （MLSS） was found to be an important factor for thermal sludge treatment as the released ortho-P and total phosphorus （TP） at 50℃ increased more than one-fold when MLSS was increased from 4000 to 8000 mg/L.

关键词： phosphorus recovery excess sludge volatile fatty acids (VfAs) metal cations

Rare earth and transitional metal colloidal supercapacitors

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2015年第11期58卷 1768-1778页

作者： CHEN Kunfeng xue Dongfeng State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences

The search of electrode materials with high electrochemical activity is one of key solutions to actualize both high energy density and high power density in a supercapacitor. Recently, we have developed one novel kind of rare earth and transitional metal colloidal supercapacitors, which can deliver higher specific capacitance than electrical double-layer capacitors(EDLC) and traditional pseudocapacitors. The electrode materials in colloidal supercapacitors are in-situ formed electroactive colloids, which were transformed from commercial rare earth and transitional metal salts in alkaline electrolyte by chemical and electrochemical assisted coprecipitation. In these colloidal supercapacitors, multiple-electron faradaic redox reactions can be utilized, which can deliver ultrahigh specific capacitance often larger than one-electron capacitance. Multiple-valence metal cations used in our designed colloidal supercapacitors mainly include Ce3+, Yb3+, Er3+, fe3+, Mn2+, fe2+, Co2+, Ni2+, Cu2+, Sn2+ and Sn4+. The colloidal supercapacitors can be served as the promising next-generation high performance supercapacitors.

关键词： supercapacitor colloidal electrode electroactive cation rare earth cation transitional metal cation

Pulling growth technique towards rare earth single crystals

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2018年第9期61卷 1295-1300页

作者： SUN CongTing xue Dongfeng State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences

Pulling growth technique serves as a popular method to grow congruent melting single crystals with multiscale sizes ranging from micrometers to *** order to obtain high quality single crystals,the crystal constituents would be arranged at the lattice sites by precisely controlling the crystal growth *** interface is the position where the phase transition of crystal constituents occurs during pulling growth *** precise control of energy at the growing interface becomes a key technique in pulling *** this work,we review some recent advances of pulling technique towards rare earth single crystal *** Czochralski pulling growth,the optimized growth parameters were designed for rare earth ions doped Y_3Al_5O_(12)and Ce:(Lu_(1-x)Y_x)_2Si O_5on the basis of anisotropic chemical bonding and isotropic mass transfer calculations at the growing *** fast growth of high quality rare earth single crystals is realized by controlling crystallization thermodynamics and kinetics in different size *** the other hand,the micro pulling down technique can be used for high throughput screening novel rare earth optical *** growth interface control is realized by improving the crucible bottom and temperature field,which favors the growth of rare earth crystal *** rare earth laser crystal fiber can serve as another kind of laser gain medium between conventional bulk single crystal and glass *** future work on pulling technique might focus on the mass production of rare earth single crystals with extreme size and with the size near that of devices.

关键词： pulling growth technique rare earth single crystals Czochralski pulling growth, micro pulling down growth Y3Al5O12 Ce:(Lu1-xYx)2SiO5 chemical bonding theory of single crystal growth

Energy internet or comprehensive energy network?

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2015年第3期3卷 297-301页

作者： Yusheng xue State grid Electric Power Research Institute Nanjing 211000China

What needs to be developed from the concept of"Smart grid"is that:when renewable energy sources are absolutely prevailing in power generation,distributed power generation and distributed energy storage systems are widespread across the grid,and electric vehicle charging loads are prevailing in power load demands,how can the power grid support electric power as a core secondary energy source,undertake the role of a bridge between primary energy and end-use energy,and achieve the coordination and the optimization in macro energy perspective;how to guarantee the security of both macro energy and environment as well as the reliability of *** a new term is needed,it should be Comprehensive Energy Network,not Energy Internet.

关键词： Energy security Environmental security Primary energy Electric power End-use energy Smart grid Energy internet Comprehensive energy network

Heterogeneity of mature oligodendrocytes in the central nervous system

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第5期20卷 1336-1349页

作者： Chao Weng Adam M.R.groh Moein Yaqubi Qiao-Ling Cui Jo Anne Stratton g.R.Wayne Moore Jack P.Antel Neuroimmunology Unit Montreal Neurological Institute-HospitalDepartment of Neurology and NeurosurgeryMcGill UniversityMontrealQCCanada Department of Neurology Renmin Hospital of Wuhan UniversityWuhanHubei ProvinceChina

Mature oligodendrocytes form myelin sheaths that are crucial for the insulation of axons and efficient signal transmission in the central nervous *** evidence has challenged the classical view of the functionally static mature oligodendrocyte and revealed a gamut of dynamic functions such as the ability to modulate neuronal circuitry and provide metabolic support to *** the recognition of potential heterogeneity in mature oligodendrocyte function,a comprehensive summary of mature oligodendrocyte diversity is *** delve into early 20th-century studies by Robertson and Río-Hortega that laid the foundation for the modern identification of regional and morphological heterogeneity in mature ***,recent morphologic and functional studies call into question the long-assumed homogeneity of mature oligodendrocyte function through the identification of distinct subtypes with varying myelination ***,modern molecular investigations,employing techniques such as single cell/nucleus RNA sequencing,consistently unveil at least six mature oligodendrocyte subpopulations in the human central nervous system that are highly transcriptomically diverse and vary with central nervous system *** and disease related mature oligodendrocyte variation denotes the impact of pathological conditions such as multiple sclerosis,Alzheimer's disease,and psychiatric ***,caution is warranted when subclassifying mature oligodendrocytes because of the simplification needed to make conclusions about cell identity from temporally confined *** studies leveraging advanced techniques like spatial transcriptomics and single-cell proteomics promise a more nuanced understanding of mature oligodendrocyte *** research avenues that precisely evaluate mature oligodendrocyte heterogeneity with care to understand the mitigating influence of species,sex,central nervous system region,age,and disease,

关键词： aging central nervous system diseases electron microscopy heterogeneity immunohistochemistry myelin sheath natural history neuroglia oligodendroglia single-cell gene expression analysis

A novel LAAS pseudo-range error over-bound method based on improved pseudo-range error distribution model

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2013年第3期26卷 638-645页

作者： xue Rui Wang Zulin School of Electronics and Information Engineering Beihang University

The high level of safety demand of civil aviation requests local area augmentation system （LAAS） extremely high navigation integrity performance. A new LAAS pseudo-range error overbound method is proposed in this paper to improve the integrity of LAAS. firstly, a more practical pseudo-range error distribution model is established. Then, by calculating the relationship between the statistical uncertainty of the model parameter and the integrity risk, a new method is proposed to calculate the pseudo-range error over-bound model. This method can effectively reduce the inflation factor and the resulting conservativeness of the over-bound model. Comparative experiments show that the method proposed in this paper performs better and satisfies the requirements of real applications.

关键词： Augmentation system Error statistics Probability density function Parameter estimation Satellite navigation Signal analysis Uncertainty analysis