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Delay-dependent robust passivity control for uncertain time-delay systems

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Journal of Systems Engineering and Electronics 2007年第4期18卷 879-884页

作者： li Guifang li huiying Yang Chengwu Flight Coll. of Nanjing Univ. of Aeronautics and Astronautics Nanjing 210006 P. R. China 810 Division School of Power Engineering Nanjing Univ. of Science and Technology Nanjing 210094 P. R. China

The robust passivity control problem is addressed for a class of uncertain delayed systems with timevarying delay. The parameter uncertainties are norm-bounded. First, the delay-dependent stability sufficient condition is obtained for the nominal system, and then, based-on the former, the delay-dependent robust passivity criteria is provided and the corresponding controller is designed in terms of linear matrix inequalities. Finally, a numerical example is given to demonstrate the validity of the proposed approach.

关键词： passive control time-varying delay delay-dependent parameter uncertainties linear matrix inequality (LMI)

Understanding coupled coordination relationships between social and ecological functions of urban green spaces

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Geo-Spatial Information Science 2023年第3期26卷 431-445页

作者： Dianfeng liu huiying li Mingli Qiu Yaolin liu School of Resource and Environmental Sciences Wuhan UniversityWuhanChina Key Laboratory of Digital Cartography and Land Information Engineering Ministry of Natural ResourcesWuhan UniversityWuhanChina

Urban Green Spaces(UGSs)can provide social and ecological benefits,and the coordination of these two functions will largely advance human-nature harmony in *** such,we proposed a comprehensive framework to evaluate UGSs multifunctionality,*** coupling coordination relationship of ecological connectivity and spatial accessibility of *** City in Central China was taken as a case study,and multiple ecosystem service values of green space patches and the disordered use of UGSs multifunctionality were *** results demonstrated low-level coupling coordination of UGSs multifunctionality in *** than 70%of UGSs were imbalanced,27.91%of which featured small sizes,low connectivity and *** suggest that planners should optimize UGSs arrangement to improve species reachability,especially for species with dispersal distance less than 4 km,and to create 15-minute community life circles for residents at the same *** findings are expected to support the promotion of UGSs multifunctionality and the balance of urban development and habitat conservation.

关键词： Urban green spaces coupling coordination analysis spatial accessibility ecological connectivity Wuhan city

DFT/TDDFT investigation on bis-cyclometalated alkynylgold(Ⅲ)complex: Comparison of absorption and emission properties

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Science China Chemistry 2013年第5期56卷 641-647页

作者： li LeiJiao BAI FuQuan ZHANG HongXing li huiying State Key Laboratory of Theoretical and Computational Chemistry Institute of Theoretical Chemistry Jilin University Jilin Institute of Chemical Technology College of Computer Science and Technology Jilin University

absorption and phosphorescent mechanism of three Au（III） complexes, Au（2,5-F2C6H3-C^CAC）（C = C-C6H4N（C6Hs）2 [Au25FPh], Au（3,5-F2C6Ha-CACAC）（C=C-C6H4N（C6Hs）2 [Au35FPh], and Au（3,5-F2C6H3-CAC^C）（C=C-C6H4N（1H- indole）2 [Au35FID], are calculated and compared using density functional theory （DFT） and time-dependent DFT （TDDFT）. The calculated results reveal that enlarging the center CACAC ligand will result in the enhanced LMCT participation. This theoretical contribution allows design of new Au（III） complexes with higher phosphorescence efficiency.

关键词： Gold(Ⅲ) absorption phosphorescence density functional calculations

Microstructure and properties of in situ synthesized TiB_2+WC reinforced composite coatings

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Rare Metals 2008年第5期27卷 451-456页

作者： li Jun ZHANG huiying li Wenge ZHANG Guangjun School of Materials Engineering Shanghai University of Engineering Science Shanghai 201620 China

Nickel-based composite coatings reinforced by in situ synthesized TiB2 and WC particles were deposited on stainless steel by laser cladding, and their microstmcture and mechanical properties were investigated. The results show that the coatings are mainly composed of 7-Ni cellular dendrites and dispersed spherical/strip/network shaped TiB2 and equiaxial WC particles. The initial WC particles are dissolved to become fine and mostly dispersed within Y-Ni cellular dendrites. The coating prepared at a special laser energy of 0.225 kJ@mm^-2 is uniform, continuous, and free of pores and cracks. With the decrease in special energy density, TiB2 phase changes from fine spherical particles which cluster together to strip shape with different morphologies and further crystallizes to form network structure, and the dispersion zone also gradually changes from intragranular to intergranular phase. The coating possesses a higher microhardness compared with the substrate, and it has a good metallurgical bond with the substrate and excellent cracking resistance.

关键词： laser cladding in situ synthesis composite coating microstructure

Development of an on-line measurement system for water-soluble organic matter in PM_(2.5) and its application in China

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Journal of Environmental Sciences 2018年第7期30卷 33-40页

作者： huiying li Xiaofeng Huang liming Cao Yuhong Zhai liwu Zeng lingyan He Key Laboratory for Urban Habitat Environmental Science and Technology School of Environment and Energy Peking University Shenzhen Graduate School

Water-soluble organic matter（WSOM） represents a critical fraction of fine particles（PM2.5）in the air, but its changing behaviors and formation mechanisms are not well understood yet, partly due to the lack of fast techniques for the ambient measurements. In this study,a novel system for the on-line measurement of water-soluble components in PM2.5, the particle-into-liquid sampler（PILS）–Nebulizer–aerosol chemical speciation monitor（ACSM）, was developed by combining a PILS, a nebulizer, and an ACSM. High time resolution concentrations of WSOM, sulfate, nitrate, ammonium, and chloride, as well as mass spectra, can be obtained with satisfied quality control results. The system was firstly applied in China for field measurement of WSOM. The mass spectrum of WSOM was found to resemble that of oxygenated organic aerosol, and WSOM agreed well with secondary inorganic ions. All evidence collected in the field campaign demonstrated that WSOM could be a good surrogate of secondary organic aerosol（SOA）. The PILS–Nebulizer–ACSM system can thus be a useful tool for intensive study of WSOM and SOA in PM2.5.

关键词： PM2.5 Water-soluble organic matter Secondary organic matter On-line measurement Mass spectrum

松脂醇二葡萄糖苷激活Wnt/β-catenin信号通路保护成骨细胞

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中国组织工程研究 2025年第2期29卷 339-346页

作者：余鹏孟东方李慧英刘洪飞贺自克河南中医药大学骨伤学院河南省郑州市450000 河南中医药大学第一附属医院河南省郑州市450000 辽宁中医药大学辽宁省沈阳市110847 河南省中医院河南省郑州市450000

背景:松脂醇二葡萄糖苷可以促进骨形成与骨基质的合成,加速骨组织修复,但其对成骨细胞的影响和作用机制仍需进一步探索。目的:基于Wnt/β-catenin信号通路探讨松脂醇二葡萄糖苷对地塞米松干预成骨细胞的影响和作用机制。方法:设置不同... 详细信息

背景:松脂醇二葡萄糖苷可以促进骨形成与骨基质的合成,加速骨组织修复,但其对成骨细胞的影响和作用机制仍需进一步探索。目的:基于Wnt/β-catenin信号通路探讨松脂醇二葡萄糖苷对地塞米松干预成骨细胞的影响和作用机制。方法:设置不同浓度的地塞米松组和松脂醇二葡萄糖苷组对成骨细胞干预24 h,筛选最佳干预浓度;使用地塞米松、松脂醇二葡萄糖苷和Wnt/β-catenin抑制剂XAV-939对成骨细胞进行干预,设置对照组、地塞米松组、抑制剂组、松脂醇二葡萄糖苷组、松脂醇二葡萄糖苷+抑制剂组。CCK-8法检测细胞活性,检测各组细胞碱性磷酸酶和半胱氨酸天冬氨酸蛋白酶3/7酶活性,Annexin V/PI染色与EdU法检测细胞凋亡与增殖情况,Real-Time qPCR检测Wnt3a、β-catenin、c-myc、骨钙素、Ⅰ型胶原蛋白的mRNA表达水平,Western Blot检测Wnt3a、β-catenin、c-myc、骨钙素、Ⅰ型胶原蛋白的蛋白表达水平。结果与结论:①地塞米松和松脂醇二葡萄糖苷干预成骨细胞24 h后,发现浓度为10μmol/L的地塞米松细胞抑制率为实验最佳干预浓度;松脂醇二葡萄糖苷浓度在100μmol/L时,细胞增殖最为明显;②与地塞米松组比较,松脂醇二葡萄糖苷组的碱性磷酸酶活性显著增强(P<0.05),半胱氨酸天冬氨酸蛋白酶3/7酶活性显著降低(P<0.05);Annexin V/PI染色和EdU法细胞增殖检测结果表明,松脂醇二葡萄糖苷可抑制地塞米松干预后成骨细胞的凋亡,促进成骨细胞增殖;③与地塞米松组和抑制剂组比较,松脂醇二葡萄糖苷组和松脂醇二葡萄糖苷+抑制剂组中Wnt3a、β-catenin、c-myc、骨钙素、Ⅰ型胶原蛋白mRNA和蛋白表达水平均显著升高(P<0.05);④结果表明,松脂醇二葡萄糖苷可以抑制地塞米松干预后的成骨细胞凋亡,通过激活Wnt/β-catenin信号通路来保护成骨细胞活性,促进成骨细胞增殖,可能发挥延缓激素性股骨头坏死的作用。

关键词：松脂醇二葡萄糖苷激素性股骨头坏死成骨细胞细胞活性 Wnt/β-catenin信号通路细胞增殖细胞凋亡

In vitro study of micro-dystrophin gene-modified mesenchymal stem cells

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Neural Regeneration Research 2010年第7期5卷 496-501页

作者： Daidi Zhao Zhiyun lian libin liu li Luo huiying li Ju liu Hongyu Zhou Department of Neurology West China Hospital of Sichuan University Chengdu 610041 Sichuan Province China

BACKGROUND： Studies have shown that the transplantation of mesenchymal stem cells （MSCs） improves dystrophin expression in muscle cell membrane of mdx mice and plays a role in ameliorating sport injuries to the myocyte. In addition, dystrophin gene plasmid injection exhibits therapeutic effect in mdx mice. However, these two methods exhibit shortcomings, such as low rate of post-transplantation expression. Therefore, the present study determined the combinatorial effects of these two methods. OBJECTIVE： To transfect and observe effects of pSL139 plasmid carrying the micro-dystrophin gene into MSCs, as well as in vitro micro-dystrophin gene expression in transfected MSCs. DESIGN, TIME AND SETTING： A comparative, molecular biology study was performed at the Laboratory of Tissue Engineering, West China Medical Center, Sichuan University from March 2007 to February 2008. MATERIALS： The pSL139 plasmid was cloned and provided by the Department of Neurology, Washington University, USA. lipofectamine 2000 was purchased from Invitrogen, USA. Mouse anti-human dystrophin N-based terminal monoclonal antibody was purchased from Chemicon, USA. METHODS： Differential velocity adherent technique and density gradient centrifugation were combined to separate and culture MSCs from C57/BL10 mice. The cells were induced to trans-differentiate into osteoblasts. Subsequently, the lipofectamine 2000 method was used to mediate transfection of plasmid pSL139 into third generation MSCs. MAIN OUTCOME MEASURES： Semi-quantitative reverse transcription polymerase-chain reaction and immunofluorescence were respectively employed to detect micro-dystrophin mRNA and protein expressions in MSCs. RESULTS： At 48 hours after MSC transfection with plasmid pSL139, a 379-kb target band was observed by agarose gel electrophoresis. Immunofluorescence revealed micro-dystrophin expression up to 45%-55%. CONCLUSION： Micro-dystrophin mRNA and protein were highly expressed in pSL139-transfected MSCs, which provided

关键词： Duchenne muscular dystrophy mesenchymal stem cells micro-dystrophin gene modification

lithiophilic CoF_(2)@C hollow spheres towards spatial lithium deposition for stable lithium metal batteries

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Journal of Energy Chemistry 2024年第10期97卷 55-67,I0002页

作者： Jianxing Wang Shuhao Yao Runming Tao Xiaolang liu Jiazhi Geng Chang Hong huiying li Guiyun Yu Haifeng li Xiao-Guang Sun Jianlin li Jiyuan liang School of Optoelectronic Materials&Technology jianghan UniversityWuhan 430056HubeiChina Institute for Advanced Materials and Manufacturing University of TennesseeKnoxilTN 37996USA School of Chemistry&Chemical Engineering Yancheng Institute of TechnologyYancheng 224051JiangsuChina Chemical Sciences Division Oak Ridge National LaboratoryOak RidgeTN 37831USA Applied Materials Division Argonne National LaboratoryLemontIL 60439USA

lithium metal(LM)is a promising anode for next-generation batteries due to its high theoretical capacity and low electrode ***,side reactions,volume change,and unwanted lithium dendrite growth seriously limit the practical application of ***,with the aid of a hard template approach,a novel lithiophilic CoF_(2)-carbon hollow sphere(CoF_(2)@C-HS)composite material is successfully prepared via a facile in-situ fluorination and etching *** lithiophilic CoF_(2) acts as nucleation sites to reduce nucleation overpotential as well as induces the spatial li deposition and the formation of liFrich solid electrolyte interphase(SEI),and the hollow carbon matrix can enhance the electrical conductivity and offer free space for LM *** simulations reveal that the synergistic effect of lithiophilic CoF_(2) and hollow carbon matrix homogenizes the electric field distribution and li~+*** from these advantages,the CoF_(2)@C-HS-modified copper substrate electrode delivers an enhanced Coulombic efficiency(CE)of 93.7%for 280 cycles at 1 mA cm^(-2)and 1 mA h cm^(-2).The symmetrical cell using CoF_(2)@C-HS can stably cycle more than 1800 h with a low voltage hysteresis of 11 mV at a current density of 0.5 MA cm^(-2)and an areal capacity of 0.5 mA h cm^(-2).Moreover,the li@CoF_(2)@C-HS composite anode enables more than 300 stable cycles at 1 C with a capacity retention of 95%in liFePO_(4)-based full cell and 110 stable cycles at 1 C in liNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)-based highvoltage full *** work might shed a new light on designing lithiophilic hosts to spatially confine LM deposition,realizing dendrite-free LM anodes and the practical applications of LM batteries.

关键词： lithium metal anode Spatial deposition Stability Nanocomposite lithiophilic CoF_(2)

Engineering practice of mechanical soil aeration for the remediation of volatile organic compound-contaminated sites in China： Advantages and challenges

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Frontiers of Environmental Science & Engineering 2016年第6期10卷 17-27页

作者： Yan Ma Xiaoming Du Yi Shi Deyi Hou Binbin Dong Zhu Xu huiying li Yunfeng Xie Jidun Fang Zheng li Yunzhe Cao Qingbao Gu Fasheng li School of Chemical and Environmental Engineering China University of Mining & Technology Beijing 100083 China Department of Soil Pollution Control State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing 100012 China School of Environment Tsinghua University Beijing 100084 China Beijing Key Laboratory for Risk Modeling and Remediation of Contaminated Sites Beijing Municipal Research Institute of Environmental Protection Beijing 100037 China Shandong Key Laboratory of Eco-Environmental Science for Yellow River Delta Binzhou University Binzhou 256600 China

In recent years, many industrial enterprises located in the urban centers of China have been relocated owing to the rapid increase in urban development. At the sites abandoned by these enterprises, volatile organic compounds have frequently been detected, sometimes at high concentrations, particularly at sites abandoned by chemical manufacturing enterprises. With the redevelopment of sites and changes in land-use tvpe associated with these sites, substantial amounts of contaminated soils now require remediation. ＂Since China is a developing country, soil remediation warrants the usage of techniques that are suitable for addressing the unique challenges faced in this country. Land shortage is a common problem in China; the large numbers of contaminated sites, tight development schedules, and limited financial resources necessitate the development of .cost-effective methods for land *** soil aeration is a simple, effective, and low-cost soil remediation tectm^que mat is particularly suitable for the remediation of large volatile organic compound-contaminated sites. Its effectiveness has been confirmed by conducting laboratory studies, pilot tests, and full-scale *** study reviews current engineei-ing practice and developmental trends of mechanical soil aeration and analyzes the advantages and disadvantages of this technology for application in China as an emerging soil remediation market. The findings of this study might aid technology development in China, as well as assist other developing countries in the assessment and implementation of costeffective hazardous waste site soil remediation programs.

关键词： Soil contamination Volatile organic compound Mechanical soil aeration Engineering practice China