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Chinese Medical Journal 2020年第20期133卷 2515-2517页

作者： Juan-Juan Yao Meng-Meng Peng guan-hua zou Kai-Xin He De-Dong Ma Institute of Respiratory Monitoring and Support Shandong UniversityJinanShandong 250012China Clinical Medicine School of Shandong University JinanShandong 250010China Department of Pulmonary and Critical Care Medicine Qilu HospitalShandong UniversityJinanShandong 250012China

To the Editor:The essence of high-flow nasal cannula(HFNC)is a constant-flow mode in non-invasive ventilator(NIVCFM).The main mechanisms of NIVCFM/HFNC are dead-space washout and generation of low-level airway pressur... 详细信息

关键词： nasal airway ventilator

Imputation of Mean of Ratios for Missing Data and Its Application to PPSWR Sampling

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Acta Mathematica Sinica,English Series 2010年第5期26卷 863-874页

作者： Guo hua zou Ying Fu LI Rong ZHU Zhong guan Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 P. R. China Department of Mathematical Sciences University of Houston-Clear Lake Houston TX 77058-1098 USA Department of Mathematical Sciences Indiana University South Bend South Bend IN 46634-7111 USA

In practical survey sampling, nonresponse phenomenon is unavoidable. How to impute missing data is an important problem. There are several imputation methods in the literature. In this paper, the imputation method of the mean of ratios for missing data under uniform response is applied to the estimation of a finite population mean when the PPSWR sampling is used. The imputed estimator is valid under the corresponding response mechanism regardless of the model as well as under the ratio model regardless of the response mechanism. The approximately unbiased jackknife variance estimator is also presented. All of these results are extended to the case of non-uniform response. Simulation studies show the good performance of the proposed estimators.

关键词： imputation item nonresponse jackknife variance estimator non-uniform response PP-SWR sampling

Skeletal phenotypes and molecular mechanisms in aging mice

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Zoological Research 2024年第4期45卷 724-746页

作者： Qiao guan Yuan Zhang Zhi-Kun Wang Xiao-hua Liu Jun zou Ling-Li Zhang School of Exercise and Health Shanghai University of SportShanghai 200438China College of Athletic Performance Shanghai University of SportShanghai 200438China

Aging is an inevitable physiological process,often accompanied by age-related bone loss and subsequent bone-related diseases that pose serious health *** on skeletal diseases caused by aging in humans is challenging due to lengthy study durations,difficulties in sampling,regional variability,and substantial ***,mice are preferred for such studies due to their similar motor system structure and function to humans,ease of handling and care,low cost,and short generation *** this review,we present a comprehensive overview of the characteristics,limitations,applicability,bone phenotypes,and treatment methods in naturally aging mice and prematurely aging mouse models(including SAMP6,POLG mutant,LMNA,SIRT6,ZMPSTE24,TFAM,ERCC1,WERNER,and KL/KL-deficient mice).We also summarize the molecular mechanisms of these aging mouse models,including cellular DNA damage response,senescence-related secretory phenotype,telomere shortening,oxidative stress,bone marrow mesenchymal stem cell(BMSC)abnormalities,and mitochondrial ***,this review aims to enhance our understanding of the pathogenesis of aging-related bone diseases.

关键词： Aging Premature aging Mice Bone Gene knockout

Shuttle-run synchronization in mobile ad hoc networks

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Frontiers of physics 2015年第3期10卷 105-112页

作者： Sheng-Fei Ma Hong-Jie Bi Yong zou Zong-hua Liu Shu-guang guan Department of Physics East China Normal University Shanghai 200241 China State Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China

In this work, we study the collective dynamics of phase oscillators in a mobile ad hoc network whose topology changes dynamically. As the network size or the communication radius of individual oscillators increases, the topology of the ad hoc network first undergoes percolation, forming a giant cluster, and then gradually achieves global connectivity. It is shown that oscillator mobility generally enhances the coherence in such networks. Interestingly, we find a new type of phase synchronization/clustering, in which the phases of the oscillators are distributed in a certain narrow range, while the instantaneous frequencies change signs frequently, leading to shuttle-run-like motion of the oscillators in phase space. We conduct a theoretical analysis to explain the mechanism of this synchronization and obtain the critical transition point.

关键词： synchronization phase transition ad hoc network

Coronaviruses and gastrointestinal diseases

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Military Medical Research 2021年第2期8卷 196-201页

作者： Xi Luo guan-Zhou Zhou Yan Zhang Li-hua Peng Li-Ping zou Yun-Sheng Yang Department of Gastroenterology and Hepatology the First Medical CenterChinese PLA General HospitalBeijing 100853China Department of Pediatrics the First Medical CenterChinese PLA General HospitalBeijing 100853China

The effects of coronaviruses on the respiratory system are of great concern,but their effects on the digestive system receive much less *** that infect mammals have shown gastrointestinal pathogenicity and caused symptoms such as diarrhea and *** data have shown that human coronaviruses,including the newly emerged SARS-CoV-2,mainly infect the respiratory system and cause symptoms such as cough and fever,while they may generate gastrointestinal ***,there is little about the relation between coronavirus and digestive *** review specifically addresses the effects of mammalian and human coronaviruses,including SARS-CoV-2,on the digestive tract,helping to cope with the new virus infection-induced disease,COVID-19.

关键词： Mammal coronaviruses Human coronaviruses Digestive system Coronavirus disease 2019(COVID-19)

Decoupling Scheme for Virtual Synchronous Generator Controlled Wind Farms Participating in Inertial Response

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Journal of Modern Power Systems and Clean Energy 2021年第2期9卷 347-355页

作者： Jiangbei Xi hua Geng Xin zou the Department of Automation Tsinghua UniversityBeijingChina the State Grid Economic and Technological Research Institute Co.Ltd. BeijingChina

In this paper,the dynamic coupling between the wind turbine rotor speed recovery(WTRSR)and inertial response of the conventional virtual synchronous generator(VSG)controlled wind farms(WFs)is *** distinguishing features are ***,the inertial response characteristics of VSG controlled WFs(VSG-WFs)are impaired by the dynamic ***,when the influence of WTRSR is dominant,the inertial response characteristics of VSG-WFs are even worse than the condition under which WFs do not participate in the response of grid ***,this phenomenon cannot be eliminated by only enlarging the inertia parameter of VSG-WFs,because the influence of WTRSR would also increase with the enhancement of inertial response.A decoupling scheme to eliminate the negative influence is then proposed in this *** starting the WTRSR process after inertial response period,the dynamic coupling is eliminated and the inertial response characteristics of WFs are ***,the effectiveness of the analysis and the proposed scheme are verified by simulation results.

关键词： Wind turbine rotor speed recovery(WTRSR) inertial response virtual synchronous generator(VSG) decoupling scheme

Brownfield Redevelopment Toward Sustainable Urban Land Use in China

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Chinese Geographical Science 2007年第2期17卷 127-134页

作者： CAO Kang guan hua School of Geographic and Oceanographic Sciences Nanjing University Nanjing 210093 China

Brownfield redevelopment is a new urban land use strategy to pursue the ideal of sustainable development. It relieves environmental pressure and resolves the glaring contradiction between urban land idleness and urban sprawl. It addresses issues of urban land use and farmland protection in China. This paper compares brownfield with greenfield, and defines brownfield and its redevelopment. It elaborates general and special government policies for this sustainable land use strategy in the context of China. General policies contain two aspects: clarifying brownfield redevelopment's priority in Chinese urban planning and land use and setting a general quantitative redevelopment target. The extent of the government's special policies, which aim at coordinating three factors in the redevelopment process, namely govern- ments, developers and users, are divided into five areas: statistics and categorization, assessment and remediation, fi- nancial supports and tax incentives, environmental and legal liability, and publicity and guidance. The paper concludes the major functions of different levels of Chinese government in the redevelopment process, i.e. making general strategy, formulating legislation, spectifying regulations and technical standards, estimating and categorizing brownfield sites, drawing up brownfield planning, providing information and financial support, guiding developers, publicizing the strategy to the public, and checking reuse results.

关键词： brownfield redevelopment sustainable development land use

High temperature thermo-photocatalysis driven carbon removal in direct biogas fueled solid oxide fuel cells

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Chinese Chemical Letters 2021年第11期32卷 3548-3552页

作者： Doudou Gu guan Zhang Jing zou Institute of Hydrogen and Fuel Cell Harbin Institute of TechnologyShenzhenShenzhen 518055China General Education Division School of Humanities Social ScienceThe Chinese University of Hong KongShenzhenShenzhen 518172China School of Civil and Environmental Engineering Harbin Institute of TechnologyShenzhenShenzhen 518055China

Solid oxide fuel cells(SOFCs)can directly convert renewable biogas into electricity with high efficiency at high temperature,however the long-term stability of SOFCs is significantly affected by the carbon deposition on the anode during cell ***,we report a novel carbon removal approach by high temperature infrared light driven photocatalytic *** the comparison of electrochemical performance of Ni-YSZ anode and TiO_(2)modified Ni-YSZ anode in the state-of-the-art single cell(Ni-YSZ/YSZ/LSCM),the modified anodes exhibit markedly improved peak powder density with simulated biogas fuel(70%CH_(4)+30%CO_(2))at 850℃with less coking after 40 h *** high activity and carbon deposition resistance of the modified anode is possibly attributed to the in situ generated hydroxyl radical from the reduced TiO_(x)powder under high temperature infrared light excitation,which is supported by detailed analysis of microstructural information of anodes and the powder-based thermo-photocatalytic experiments.

关键词： Thermo-photocatalysis Infrared light excitation Carbon removal Biogas utilization Solid oxide fuel cells

Synthesis of Pb(OH)2/rGO Catalyst for Conversion of Sugar to Lactic Acid in Water

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Chinese Journal of Chemical Physics 2015年第4期28卷 -页

作者： guan-hua Hou Li-feng Yan Department of Chemical Physics Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) University of Science and Technology of China Hefei 230026 China

Conversion of sugars from biomass to platform chemicals or fuels is an attracting topic for the utilization of biomass. Pb2+ ion is an efficient catalyst for the degradation of sugar to lactic acid, and it will be better to fix lead on a solid catalyst to reduce the risk of exposure of Pb2+ to environment. Here, a simple method has been developed to prepare a composite catalyst of Pb(OH)2/rGO, where the nanoparticles of Pb(OH)2 in size of 2–5 nm were prepared and fixed over the as-prepared reduced graphene oxide (rGO) nanosheets. The as-obtained catalyst showed an efficient catalytic activity to degrade glucose, fructose, and cellulose in aqueous solution, and the major product is lactic acid. The yield of lactic acid reached 58.7% when fructose was used as the feedstock (433 K and 2.5 MPa N2), and the catalyst can be recycled with high activity. Cellulose can also be directly converted into lactic acid in aqueous solution over the catalyst without extra acid or alkali, and the maximum yield of lactic acid is 31.7%.

关键词： Graphene Lead hydroxide Nanoparticles Composite Catalyst Lactic acid

BLUP Estimation of Linear Mixed-effects Models with Measurement Errors and Its Applications to the Estimation of Small Areas

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Acta Mathematica Sinica,English Series 2014年第12期30卷 2027-2044页

作者： Rong ZHU Guo hua zou Academy of Mathematics and Systems Science Chinese Academy of Sciences

The linear mixed-effects model （LMM） is a very useful tool for analyzing cluster data. In practice, however, the exact values of the variables are often difficult to observe. In this paper, we consider the LMM with measurement errors in the covariates. The empirical BLUP estimator of the linear combination of the fixed and random effects and its approximate conditional MSE are derived. The application to the estimation of small area is provided. Simulation study shows good performance of the proposed estimators.

关键词： BLUP linear mixed-effects models measurement errors small area estimation