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The Ergodicity of a Class of Almost Anosov Systems

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Acta Mathematica Sinica,English Series 2013年第1期29卷 193-198页

作者： yun hua zhou College of Mathematics and Statistics Chongqing University

In this paper, we prove that some volume-preserving almost Anosov systems are ergodic if they are essentially accessible. The key idea is that there are stable and unstable manifolds with uniform size on the orbits Of... 详细信息

关键词： Ergodicity almost Anosov essential accessibility

Effects of single lance configuration on coal combustion process in tuyere from viewpoint of coal plume

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Journal of Iron and Steel Research International 2021年第7期28卷 785-798页

作者： yun-hua zhou Ping zhou Jia-yun Dan Hong-jie Yan Dong-ling Wu Valin Xiangtan Iron and Steel Corporation Xiangtan 411101HunanChina School of Energy Science and Engineering Central South UniversityChangsha 410083HunanChina

Pulverized coal utilization in the blast furnace is decided by the particle flow and combustion behaviors in the *** a specific operating condition,these behaviors are directly related to the lance configuration in the upstream tuyere *** on single straight lance,six types of single lance configurations were designed by assembling four parameters in different *** four parameters are the lance diameter,lance insertion angle,and the horizontal and vertical distances from the lance tip to the tuyere *** different lance configuration schemes applied,the pulverized coal combustion process in the lance-blowpipe-tuyere zone was *** simulation results regarding particle diffusion and combustion behaviors were characterized by three indicators from the viewpoint of a coal *** are the plume diffusion angle,diffusion uniformity,and the average plume temperature at the tuyere *** promote coal utilization,the values of these indicators under different configurations were analyzed,yielding two optimal *** first one is to reduce the lance length immersed in the blowpipe-tuyere by 100 *** other is to increase the horizontal distance from the lance tip to the tuyere outlet by 50 mm,and the insertion angle to 11° with the lance tip located at the tuyere *** findings can enhance the understanding of the influence mechanism of lance con-figuration on the coal utilization and provide guidelines for the design of new lance configurations.

关键词： Pulverized coal plume Particle dispersion Lance configuration Blast furnace

Sub-additive Topological and Measure-theoretic Tail Pressures

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Acta Mathematica Sinica,English Series 2017年第12期33卷 1617-1631页

作者： Jing Lan PENG yun hua zhou College of Mathematics and Statistics Chongqing University Chongqing 401331 P. R. China

In this paper, we give some definitions of the topological tail pressures for sub-additive potentials and prove that they are equivalent if the potentials are continuous. Under some assumptions, we get a variational principle which exhibits the relationship between topological tail pressure and measure-theoretic tail entropy. Finally, we define a new measure-theoretic tail pressure for sub-additive potentials and some interesting properties of it are obtained.

关键词： Tail pressure variational principle sub-additive potential

Sub-additive Unstable Topological Pressure of Diffeomorphisms

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Acta Mathematica Sinica,English Series 2022年第12期38卷 2285-2298页

作者： Wen Da ZHANG Zhi Qiang LI yun hua zhou College of Mathematics and Statistics Chongqing Jiaotong UniversityChongqing 400074P.R.China College of Mathematics and Statistics Chongqing UniversityChongqing 401331P.R.China

In this paper,we study unstable topological pressure for C^(1)-smooth partially hyperbolic diffeomorphisms with sub-additive ***,without any additional assumption,we have established the expected variational principle which connects this unstable topological pressure and the unstable measure theoretic entropy,as well as the corresponding Lyapunov exponent.

关键词： Partially hyperbolic systems unstable topological pressure sub-additive potentials

Behavioral Risk Profile of Men Who Have Sex with Men in Beijing, China： Results from a Cross-sectional Survey with Randomized Response Techniques

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Chinese Medical Journal 2016年第5期129卷 523-529页

作者： Guo-Zhu Geng Ge Gao Yu-hua Ruan Ming-Run Yu yun-hua zhou Department of Epidemiology and Health Statistics School of Public Health Medical College of Soochow University Suzhou Jiangsu 215123 China Chinese Center for Disease Control and Prevention State Key Laboratory of Infectious Disease Prevention and Control Collaborativelnnovation Center for Diagnosis and Treatment of Infectious Diseases Beijing 102206 China Department of STD/AIDS and Dermatology Taizhou City Center for Disease Control and Prevention Taizhou Jiangsu 225300 China

Background：Human immunodeficiency virus （HIV） is spreading rapidly among men who have sex with men （MSM） in *** questionnaires or direct interviews have been frequently used to study their *** aim of the study was to describe the behavioral risk profile of the MSM in Beijing using the randomized response techniques （RRTs）.Methods：A cross-sectional survey of sexual behavior among a sample of MSM was conducted in two HIV counseling and testing clinics in *** survey was carried out with an anonymous questionnaire containing sensitive questions on sexual *** obtain the honest responses to the sensitive questions,three distinctive RRTs were used in the questionnaire：（1） Additive randomized response model for quantitative questions,（2） randomized response model for multiple choice questions,and （3） Simmons randomized response model for binomial *** for the point estimate,variance,and confidence interval （CI） were provided for each specific ***：Using RRTs in a sample of 659 participants,the mean age at first homosexual encounter was estimated to be 21.7 years （95% CI：21.2-22.2）,and each had sex with about three （2.9,95% CI：2.4-3.4） male partners on average in the past *** estimated rate for consistent condom use was 56.4% （95% CI：50.1-62.8%）.In addition,condom was estimated to be used among 80.0% （95% CI：74.1-85.9%） of the population during last anal sex with a male ***：Our study employed RRTs in a survey containing questions on sexual behavior among MSM,and the results showed that RRT might be a useful tool to obtain truthful feedback on sensitive information such as sexual behavior from the respondents,especially in traditional Chinese cultural settings.

关键词： Condom Use, Cross-sectional Survey: Men Who Have Sex with Men Randomized Response Technique, Sexual Behavior

Hydrophobic long-chain two-dimensional perovskite scintillators for underwater X-ray imaging

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Rare Metals 2024年第1期43卷 175-185页

作者： Jin-Xiao Zheng Zi-An zhou Tiao Feng Hui Li Cheng-hua Sun NüWang Yang Tian Yong Zhao Shu-yun zhou Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Laboratory of Bioinspired Smart Interfacial Science and Technology of the Ministry of Education Beijing Key Laboratory of Bioinspired Energy Materials and DevicesSchool of ChemistryBeijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijing 100191China Department of Engineering Physics Tsinghua University and Key Laboratory of Particle and Radiation Imaging Ministry of EducationTsinghua UniversityBeijing 100084China e-mail:yangt@***

The underwater X-ray imaging technology development is significant to subaqueous target reconnaissance/detection/identification, subfluvial archaeology,submerged resource exploration, etc. As the core of X-ray imaging detection, the scintillator has been plagued by inherent moisture absorption and decomposition, and strict requirements for seamless packaging and ***, we designed a manganese-doped two-dimensional(2D) perovskite scintillator modified by hydrophobic longchain organic amine through the combination of component and doping engineering. The modified perovskites show high water repellency that can be used as an underwater X-ray scintillator. X-ray images of aquatic organisms or other objects with a high spatial resolution of10 lp·mm^(-1) at a big view field(32 mm × 32 mm) were obtained by scintillation screen. This hydrophobic perovskite scintillator based on molecular design is of great promise in underwater X-ray nondestructive testing technology development.

关键词： Two-dimensional perovskite Hydrophobic Scintillators Underwater X-ray imaging Underwater nondestructive testing technology

Updates of developments in interventional therapy for elderly patients with cardiovascular diseases

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Journal of Geriatric Cardiology 2024年第1期21卷 1-3页

作者： hua SHEN Xun-Xun FENG Qian-yun GUO Yu-Jie zhou Beijing Key Laboratory of Precision Medicine of Coronary Atherosclerotic Disease Beijing Institute of Heart Lung and Blood Vessel DiseaseClinical Center for Coronary Heart DiseaseDepartment of CardiologyBeijing Anzhen HospitalCapital Medical UniversityBeijingChina

Cardiovascular diseases(CVD)are the leading cause of death in the world and one of the most common diseases in the elderly,with high prevalence and poor prognosis,which seriously affect the health of the elder *** report showed that global deaths from CVD increased from 12.4 million in 1990 to 19.8 million in 2022,reflecting the global population growth and aging,as well as the impact of metabolic,environmental,and behavioral risks.[1]With the progress of aging population,the burden of CVD in the elderly in China has increased year by year,and factors including multiple complications,organ function decline,and high complication rate have made the interventional treatment of CVD in the elderly one of the difficulties and focuses in the field of cardiology in China.

关键词： diseases patients prognosis

Multi-time Collaborative Restoration for Integrated Electrical-gas Distribution Systems Based on Rolling Optimization

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 660-671页

作者： Jingyang yun Zheng Yan yun zhou Peichao Zhang Weidong Hu Key Laboratory of Control of Power Transmission and Conversion of Ministry of Education Department of Electrical EngineeringShanghai Jiao Tong University

This paper proposes a multi-time collaborative restoration model for integrated electricity-gas distribution sys-tems(IEGDSs)considering multiple resources after extreme weather *** on the linearized power flow constraints of the unbalanced electrical distribution system(EDS)and gas distribution system(GDS),this problem can be formulated as a mixed-integer linear programming(MILP)*** improve the efficiency and veracity of the solution,a rolling optimiza-tion based two-stage method is developed with the first stage solved by a linear approximation model,and the second stage solved by real-time updated rolling *** solving the MILP problem using rolling optimization,the proposed model and solution method achieve efficient and reliable collaborative restoration of IEGDS considering multiple resources and unbal-anced operation characteristics of *** effectiveness of the proposed model and method is validated by using an IEGDS made of a 37-bus unbalanced EDS and 11-node *** Terms-Electricity-gas system,mix-integer linear programming,power system restoration.

关键词： Electricity-gas system mix-integer linear programming power system restoration

The Ergodicity of a Class of Almost Anosov Systems

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数学学报(中文版) 2013年第2期 292-292页

作者： yun hua zhou

In this paper,we prove that some volume-preserving almost Anosov systems are ergodic if they are essentially *** key idea is that there are stable and unstable manifolds with uniform size on the orbits of the hyperbol... 详细信息

关键词： The Ergodicity of a Class of Almost Anosov Systems