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Dual Power Allocation Optimization Based on Stackelberg Game in Heterogeneous Network with Hybrid Energy Supplies

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China Communications 2017年第10期14卷 84-94页

作者： Shiyu Ji Liangrui Tang mengxi zhang Shimo Du State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University China Mobile Communication Group Ltd Zhe Jiang Branch

In heterogeneous network with hybrid energy supplies including green energy and on-grid energy, it is imperative to increase the utilization of green energy as well as to improve the utilities of users and networks. As the difference of hybrid energy source in stability and economy, thus, this paper focuses on the network with hybrid energy source, and design the utility of each user in the hybrid energy source system from the perspective of stability, economy and environment pollution. A dual power allocation algorithm based on Stackelberg game to maximize the utilities of users and networks is proposed. In addition, an iteration method is proposed which enables all players to reach the Stackelberg equilibrium(SE). Simulation results validate that players can reach the SE and the utilities of users and networks can be maximization, and the green energy can be efficiently used.

关键词： dual power allocation Stackelberg game heterogeneous network hybrid energy source

An experimental evaluation of pile-anchor strengthening mechanics for existing tunnels in landslide region

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Underground Space 2022年第2期7卷 199-218页

作者： Zhiguo zhang Lei Fang Qihua Zhao mengxi zhang Yutao Pan Bingbing Ma School of Environment and Architecture University of Shanghai for Science and Technology516 Jungong RoadShanghai 200093China Key Laboratory of Geohazard Prevention of Hilly Mountains Ministry of Natural ResourcesFujian Key Laboratory of Geohazard PreventionFuzhou 350002China Department of Civil and Environmental Engineering National University of SingaporeSingapore State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengduSichuan 610059China Department of Civil Engineering Shanghai UniversityShanghai 200444China

The landslides have an important influence on the force and deformation of existing tunnels,which may adversely affect the liner structures and even endanger normal *** scholars have made few efforts to investigate the reinforcement measures for existing tunnels in the landslide region,and even paid less attention to probe into the pile-anchor strengthening mechanics.A new kind of pile-anchor strengthening system for existing tunnels has been proposed in this paper considering the influences of deforming land-slides,in which the anti-slide pile,the anchor cable and the tunnel lining were integrated as one force *** order to observe the pile-anchor strengthening mechanics,three physical model tests for comparative analyses were established in case of the tunnel axis parallel to the sliding direction of landslide,including the conditions without reinforcements,only with anti-slide pile and full with the pile-anchor strengthening *** for the pile-anchor strengthening model tests,the extra experimental evaluation for the interaction mechanics between existing tunnel and landslide was added,such as,the tunnel diameter of 40 and 50 mm and the pile-anchor of three and six *** addition,three-dimensional numerical models were implemented to analyze the landslide deformation and the internal force of tunnels after installing the pile-anchor strengthening *** with non-reinforcement,the bending moment of tunnel and contact stress at interface between tunnel and landslide at the position of 200 m away from tunnel entrance with six pairs pile-anchor reinforcement dropped by 97.2% and 50%.The results show that the deformation of landslide,the bending moment of existing tunnel and the contact stress at the interface between tunnel and landslide pronouncedly diminish after taking the pile-anchor strengthening *** new combined pile-anchor system has higher bearing capacity and stability,which can further improve the operation

关键词： Tunnel-landslide interaction Anchor cable Pile-anchor strengthening mechanics Physical model test

Sealing functional ionic liquids in conjugated microporous polymer membrane by solvent-assisted micropore tightening

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Nano Research 2022年第3期15卷 2552-2557页

作者： mengxi zhang Anke Yu Xiangyu Wu Pengpeng Shao Xin Huang Dou Ma Xianghao Han Jing Xie Xiao Feng Bo Wang Frontiers Science Center for High Energy Material Advanced Technology Research Institute(Jinan)Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion MaterialsKey Laboratory of Cluster ScienceMinistry of EducationSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China

Porous organic polymers hold great promise for molecular sieving membrane *** the inclusion of functional ionic liquid(IL)in the pores offers a facile way to manipulate their separation properties,the IL leaching during the separation process is difficult to ***,we report a strategy to in-situ encapsulate ILs into the micropores of the conjugated microporous polymer membrane via a 6-min electropolymerization and further seal the aperture of the pores to prevent ILs leaching by solvent-assisted micropore tightening(SAMT).Upon screening the binding energy between different ILs and gas molecules,two ILs were selected to be incorporated into the membrane for CO_(2)/CH_(4) and O_(2)/N_(2) gas *** resultant separation performances surpass the 2008 Robeson upper ***,the ILs can be locked in the micropores by a facile high surface tension solvent treatment process to improve their separation stability,as evidenced by a 7-day continuous *** simple and controllable process not only enables efficient and steady separation performance but also provides an effective strategy for confining and sealing functional guest molecules in the porous solids for various applications.

关键词： conjugated microporous polymer organic porous membrane in-situ encapsulation pore sealing membrane separation

养老机构老年人跌倒风险综合评估工具的研制与检验

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中国全科医学 2025年第4期28卷 491-498页

作者：罗园张华王三香张孟喜邓雨茜冉海烨刘佳欣张毅陈希吴一波赵丽萍首都医科大学护理学院北京市100069 中南大学湘雅护理学院湖南省长沙市410013 长沙老年康复护理院护理部湖南省长沙市410007 湖南阿默养老服务有限公司湖南省长沙市410011 中南大学湘雅二医院临床护理教研室湖南省长沙市410011 湖南中南大学湘雅口腔医院口腔健康研究湖南省重点实验室湖南省长沙市410000 北京大学公共卫生学院北京市100191

背景我国自1999年宣布进入老龄化社会以来,人口老龄化程度日益严重,养老机构成为老年人养老热门选择,但跌倒问题频发且现有评估工具效果不佳。目的研制养老机构老年人跌倒风险综合评估工具并检验其信效度。方法2021年3—12月,通过文献... 详细信息

背景我国自1999年宣布进入老龄化社会以来,人口老龄化程度日益严重,养老机构成为老年人养老热门选择,但跌倒问题频发且现有评估工具效果不佳。目的研制养老机构老年人跌倒风险综合评估工具并检验其信效度。方法2021年3—12月,通过文献回顾、半结构式访谈、2轮专家函询及预调查,形成量表初始条目,并在养老机构随机选择老年人和养老护理员进行调查。采用SPSS 26.0和AMOS 26.0软件进行信效度分析和评价,采用相关系数法、临界比值法、内部一致性分析及探索性因素分析进行条目分析和筛选,选用内在信度、分半信度、评定者间信度和同质性信度检验评估工具的信度,选用表面效度、内容效度、效标关联效度、结构效度和区分效度检验评估工具的效度,采用受试者工作特征曲线检验评估工具的预测能力。结果构建的评估工具包括3个子工具:(1)老年人跌倒风险评估量表;(2)老年人跌倒史风险追踪调查表;(3)老年人跌倒风险每日检查清单。老年人跌倒风险评估量表总Cronbach'sα系数为0.73,评定者间系数为0.85;探索性因子分析提取3个公因子,累识方差贡献率为57.95%;验证性因子模型拟合度参数中的卡方自由度比值(χ^(2)/df)、拟合优度指数(GFI)、调整后拟合优度指数(AGFI)、基于标准化适度指标(NFI)、比较拟合指数(CFI)、Tucker-Lewis系数(TLI)、近似误差均方根(RMSEA)分别为2.43、0.95、0.91、0.89、0.93、0.91、0.07,区分效度经验证存在统计学意义(P<0.001)。预测能力分析结果显示,以Morse跌倒评估表(MFS)≥55分为标准时,受试者工作特征曲线下面积(AUC)为0.87;以MFS≤25分为标准时,AUC为0.84。老年人跌倒史风险追踪调查表和老年人跌倒风险每日检查清单经专家和养老护理员的评价后,形成最终版本。结论本研究开发养老机构老年人跌倒风险综合评估工具,包含3个子量表,三者间相辅相成,完善养老机构从评估到预防的全路径,具有良好的信效度和预测能力,可为日后我国养老机构跌倒预防及管理提供参考。

关键词：意外跌倒老年人养老机构风险评估

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软土城区土压平衡盾构上下交叠穿越地铁隧道的变形预测及施工控制

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岩石力学与工程学报 2013年第S2期32卷 3428-3439页

作者：张治国张孟喜上海理工大学环境与建筑学院上海200093 上海大学土木工程系上海200072 兰州大学西部灾害与环境力学教育部重点实验室甘肃兰州730000

由于城市高楼密集,地铁隧道网络发达,建筑物桩基、市政管线和既有隧道等地下构筑物对新建隧道空间形成较大限制,因此施工盾构往往不可避免地叠交穿越绕行既有构筑物。尤其是上下叠交的隧道穿越存在着重大施工风险,对既有隧道的安全运营... 详细信息

由于城市高楼密集,地铁隧道网络发达,建筑物桩基、市政管线和既有隧道等地下构筑物对新建隧道空间形成较大限制,因此施工盾构往往不可避免地叠交穿越绕行既有构筑物。尤其是上下叠交的隧道穿越存在着重大施工风险,对既有隧道的安全运营构成极大安全隐患。结合上海轨道交通工程实践,采用简化理论方法、三维有限元数值模拟方法以及现场监测方法,揭示软土城区土压平衡盾构机上下交叠穿越地铁隧道的变形规律,提出上下交叠穿越地铁隧道的盾构施工参数设定规律以及安全控制技术措施。其中简化理论方法基于Winkler地基模型,得到盾构上下交叠穿越引起的既有隧道纵向沉降的计算表达式;三维数值模拟方法优化施工方法和盾构掘进参数,分析盾构隧道以较大斜交角度上下叠交施工穿越的实际工况;现场监测方法提供土压平衡盾构机上下交叠穿越地铁隧道的变形数据以及切口土压力、同步注浆、推进速度、管片拼装高程以及刀盘扭矩等施工参数的设定规律。研究成果可为合理制定城市地铁隧道交叠穿越运营隧道的保护措施提供一定理论依据,也可为其他类似多线叠交盾构隧道穿越工程提供一定的施工借鉴和参考。

关键词：隧道工程土压平衡盾构上下交叠穿越掘进参数 Winkler地基三维有限元数值模拟现场监测

Model test on sand retaining wall reinforced with denti-strip inclusions

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Science China(Technological Sciences) 2008年第12期51卷 2259-2269页

作者： zhang mengxi1 & ZHOU Huai1,2 1 Department of Civil Engineering,Shanghai University,Shanghai 200072,China 2 Shanghai Chengtou City Land(Group) Corporation,Shanghai 200438,China Department of Civil Engineering Shanghai University Shanghai 200072 China Shanghai Chengtou City Land (Group) Corporation Shanghai 200438 China

In conventional reinforced soil structures,the reinforcements are often laid hori-zontally in the *** this paper,a new concept of soil reinforced with denti-strip inclusions was proposed and a series of laboratory model tests were carried out on sand retaining wall reinforced with denti-strip *** the horizontal displacements of the facing,the lateral earth pressures acting on vertical elements were measured.A microscopic measurement was performed to investigate the deformation and progressive failure of the sand within model retaining *** on the image analytical technique,the bearing capability and interaction mechanism of reinforced sand retaining wall were *** model of the initial shear failure and potential failure surface were also put *** the experimental results,it is shown that denti-strip inclusions can increase the bearing capability of retaining wall significantly and restrict the facing displacements efficiently,as compared with conventional horizontal reinforcement.

关键词： denti-strip inclusions reinforced sand retaining wall model test horizontal facing displacements lateral earth pressure on denti-elements failure surface

Human mobility data in the COVID-19 pandemic:characteristics,applications,and challenges

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International Journal of Digital Earth 2021年第9期14卷 1126-1147页

作者： Tao Hu Siqin Wang Bing She mengxi zhang Xiao Huang Yunhe Cui Jacob Khuri Yaxin Hu Xiaokang Fu Xiaoyue Wang Peixiao Wang Xinyan Zhu Shuming Bao Wendy Guan Zhenlong Li Department of Geography Oklahoma State UniversityStillwaterOKUSA Center for Geographic Analysis Harvard UniversityCambridgeMAUSA School of Earth and Environmental Sciences The University of QueenslandSt LuciaAustralia Institute for Social Research University of MichiganAnn ArborMIUSA School of Health Ball State UniversityMuncieINUSA Department of Geosciences University of ArkansasFayettevilleARUSA Department of Geography University of ConnecticutStorrsCTUSA Lake Erie College of Osteopathic Medicine Seton Hill UniversityGreensburgPAUSA School of Resource and Environmental Sciences Wuhan UniversityWuhanPeople’s Republic of China State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanPeople’s Republic of China China Data Institute Ann ArborMIUSA Geoinformation and Big Data Research Laboratory Department of GeographyUniversity of South CarolinaColumbiaSCUSA

The COVID-19 pandemic poses unprecedented challenges around the *** studies have applied mobility data to explore spatiotemporal trends over time,investigate associations with other variables,and predict or simulate the spread of *** objective was to provide a comprehensive overview of human mobility open data to guide researchers and policymakers in conducting data-driven evaluations and decision-making for the COVID-19 pandemic and other infectious disease *** summarized the mobility data usage in COVID-19 studies by reviewing recent publications on COVID-19 and human mobility from a data-oriented *** identified three major sources of mobility data:public transit systems,mobile operators,and mobile phone *** approaches have been commonly used to estimate human mobility:public transit-based flow,social activity patterns,index-based mobility data,and social media-derived mobility *** compared mobility datasets’characteristics by assessing data privacy,quality,space–time coverage,high-performance data storage and processing,and *** also present challenges and future directions of using mobility *** review makes a pivotal contribution to understanding the use of and access to human mobility data in the COVID-19 pandemic and future disease outbreaks.

关键词： COVID-19 public health human mobility open data mobile phone mobility index

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双层立体加筋砂土的强度特性

岩石力学与工程学报 2006年第z1期25卷 3289-3298页

作者：张孟喜王振武上海大学土木工程系上海200072

在提出立体加筋方式的基础上,对水平–竖向复合加筋和竖向加筋两种加筋形式的立体加筋砂土进行大量的三轴试验。结果表明,相对于无筋土及传统的水平加筋砂土而言,立体加筋砂土强度有大幅度提高。对比分析竖向加筋率与立体加筋砂土强度... 详细信息

在提出立体加筋方式的基础上,对水平–竖向复合加筋和竖向加筋两种加筋形式的立体加筋砂土进行大量的三轴试验。结果表明,相对于无筋土及传统的水平加筋砂土而言,立体加筋砂土强度有大幅度提高。对比分析竖向加筋率与立体加筋砂土强度之间的关系,比较不同围压下的强度变化。在试验基础上,分析立体加筋砂土的工作机制,并利用极限平衡理论建立双层立体加筋土的强度模型,最后将竖向加筋砂土的部分试验结果与理论值进行对比,结果表明二者基本吻合。

关键词：土力学立体加筋工作机制强度模型三轴试验

Study on the Extraction Process of Total Flavonoids from Morinda citrifolia L.

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Agricultural Biotechnology 2021年第3期10卷 63-65页

作者： mengxi zhang Donghai CHU Ruitong ZHAN Jiangjun LI Bing HU School of Biomedical and Chemical Engineering Liaoning Institute of Science and TechnologyBenxi 117004China

[Objectives]This study was conducted to explore the best extraction technology of total flavonoids from Morinda citrifolia L.[Methods]An orthogonal test was carried out to select the best extraction process with the yield of total flavonoids in the extract as the investigation index.[Results]Among the four factors of experimental design,the extraction time had a very significant impact on the results,the ethanol concentration had a significant impact on the results,and the extraction temperature and ethanol dosage had no significant impacts on the *** optimal extraction process conditions for the total flavonoids of *** were as follows:extraction time 1.5 h,ethanol concentration 90%,extraction temperature 60-65℃,and ethanol dosage 1∶20(g/ml).The total flavonoids in *** fruit were extracted according to the optimal extraction process conditions,and the yield was 2.936%.[Conclusions]This study provides a theoretical basis for obtaining the optimal extraction process conditions for total flavonoids of ***.

关键词： Orthogonal test Morinda citrifolia L. Total flavonoids Ultraviolet spectrophotometry