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Public transport inclusion and active aging: A systematic review on elderly mobility

Journal of Traffic and Transportation Engineering(English Edition) 2024年第2期11卷 312-347页

作者： na zhang Qi Yang School of Humanities Chang'an UniversityXi'an 710064China School of Transportation Engineering Chang'an UniversityXi'an 710064China School of Economics and Management Chang'an UniversityXi'an 710064China

Global aging has brought attention to addressing the elderly mobility dilemma,and a commitment to address inclusive transport in *** inclusion for older adults aims at establishing an age-friendly transport *** a direct policy goal and promoting active aging as an indirect social goal,to help older populations gain access to transport and social *** on the analysis of scientific knowledge mapping over the past 30 years,this study visualizes the hotspots and trends in elderly mobility *** a qualitative analysis of 138 papers,this paper reviews the theoretical foundations for transport inclusion and three themes of elderly mobility research,proposes a framework for public transport(PT)inclusion research as well as future research *** study suggests that transport inclusion can help enhance elderly health,social participation,and subjective *** can improve their travel opportunities for active aging in four ways:opportunity accessibility,physical accessibility,age-friendly informationalization,and cost *** research should pay attention to examining the mechanism of perceived transport inclusion on active aging,expanding the multilevel research space of the capability approach(CA),and exploring the subjectiveobjective integrated research model for PT *** research contributes to the overall knowledge of the theoretical and empirical researches on PT inclusion for the elderly and promotes the integrated application of interdisciplinary knowledge in the field.

关键词： Transportation engineering Elderly mobility Transport-related social exclusion Transport inclusion Active aging

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Estimating leaf area index by inversion of reflectance model for semiarid natural grasslands

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Science China Earth Sciences 2009年第1期52卷 66-84页

作者： zhang na ZHAO YingShi College of Resources and Environment Graduate University of Chinese Academy of SciencesBeijing 100049China

The study developed an integrated reflectance model combining radiative transfer and geometric optical properties in order to inverse leaf area index(LAI) of semiarid natural *** order to better link remote sensing information with land plants,and facilitate regional and global climate change studies,the model introduced a simple but important geometrical similarity parameter related to plant crown *** model revealed the influences of different plant crown shapes(such as spherical,cylindrical/cuboidal and conic crowns) on leaf/branch angle distribution frequencies,shadow ground coverage,shadowed or sunlit background fractions,canopy reflectance,and scene *** modeled reflectance data agreed with the measured ones in the three Leymus chinensis steppes with different degradation degrees,which validated the reflectance *** lower the degradation degree was,the better the modeled data agreed with the measured *** this reflectance model was coupled with the optimization inversion method,LAI over the entire study region was estimated once every eight days using the eight-day products of surface reflectance obtained by multi-spectral Moderate-Resolution Imaging Spectroradiometer(MODIS) during the growing seasons in *** temporal and spatial patterns of inversed LAI for the steppes with different cover degrees,swamps,flood plains,and croplands agreed with the general laws and measurements very *** for unused land cover types(sands,saline,and barren lands) and forestlands,totally accounting for about 10% of the study region,the reasonable LAI values were not derived by inversing,requiring further revising of the model or the development of a new model for them.

关键词： leaf area index plant crown shape geometrical similarity parameter reflectance model radiative transfer geometric optics inversion semiarid natural grassland

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Determination and ecological risk assessment of arsenic and mercury in sediments from the Changjiang River Estuary and adjacent East China Sea

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Acta Oceanologica Sinica 2021年第4期40卷 32-38页

作者： Yu'na zhang Qianwen Wang Central Laboratory Qingdao Agricultural UniversityQingdao 266109China

Arsenic(As)and mercury(Hg)are pollutants presented in marine environment.A process of atomic fluorescence spectrometry was proposed for the simultaneous determination of As and Hg in marine sediment samples(n=38)collected from the Changjiang River Estuary and adjacent East China *** proposed method used an optimized pretreatment procedure in an aqua regia–H_(2)O digestion *** of As and Hg increased to97%and 98%,respectively,with suitable precisions(2.7%–4.1%)under optimized process *** and Hg were widely presented in these samples,with the ranges of content values were 2.39–8.77μg/g for As and48.03–410.8 ng/g for *** indicate that anthropogenic factors strongly influence the abundances of As and Hg in investigated *** preliminary environmental risk assessment was investigated using the Igeoaccumulation index(Igeo)and anthropogenic contribution rate(M).Findings reveal that Hg demonstrates a strong ecological risk(with average values of 1.3 and 72%for Igeo and M,respectively)in the sediments from the Changjiang River Estuary and adjacent East China ***,Hg should be considered in future investigations.

关键词： arsenic mercury marine sediment spatial distributions ecological risk

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Jensen’s Inequality Under Nonlinear Expectation Generated by BSDE with Jumps

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Acta Mathematicae Applicatae Sinica 2019年第4期35卷 873-884页

作者： na zhang Guang-yan JIA School of Science Tianjin University of Technology Tianjin 300384 China Zhongtai Securities Institute for Financial Studies Shandong University Jinan 250100 China

In this paper, we study Jensen’s inequality under f-expectation, which is a nonlinear expectation generated by backward stochastic differential equations(BSDEs) with jumps. We connect f-convex functions with the viscosity solutions of a kind of integral partial differential equations(IPDEs) with non-local *** find that under Lipschitz condition, the f-convex function is still convex in the usual sense, i.e., the jumps shrink the range of ‘convex’ functions.

关键词： backward stochastic differential equation with jumps f-convexity Jensen’s inequality

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A New Representation for Second Order Stochastic Integral-differential Operators and Its Applications

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Acta Mathematicae Applicatae Sinica 2015年第1期31卷 59-70页

作者： Guang-yan JIA na zhang Qilu Securities Institute for Financial Studies Shandong University College of Management and Economics Tianjin University China Center for Social Computing Tianjin University

In this paper, we＇ll prove new representation theorems for a kind of second order stochastic integral- differential operator by stochastic differential equations （SDEs） and backward stochastic differential equatio... 详细信息

关键词： backward stochastic differential equation with jumps representation theorem stochastic integral-differential operator f-expectation

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Small-divisor Equation of Higher Order with Large Variable Coefficient and Application to the Coupled KdV Equation

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Acta Mathematica Sinica,English Series 2011年第10期27卷 2005-2032页

作者： Mei na GAO Jing zhang School of Mathematical Sciences Fudan University Shanghai 200433 P. R. China

In this paper, we establish an estimate for the solutions of small-divisor equation of higher order with large variable coefficient. Then by formulating an infinite-dimensional KAM theorem which allows for multiple normal frequencies and unbounded perturbations, we prove that there are many periodic solutions for the coupled KdV equation subject to small Hamiltonian perturbations.

关键词： KAM theorem small-divisor equation with large variable coefficient coupled KdV equation

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Novel Poly(methyl methacrylate)-based Ionomers Used as Multifunctional Aids to Modify Poly(vinyl chloride)

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Chinese Journal of Polymer Science 2016年第4期34卷 483-490页

作者： Li-na zhang 宋义虎郑强 Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Zhejiang University Hangzhou 310027 China

Poly（methyl methacrylate）（PMMA） based ionomers with different lanthanum （La（III）） contents （PMMA-XLa） synthesized by free radical solution polymerization were applied to poly（vinyl chloride）（PVC） resins as a kind of multifunctional aids, and their performances were evaluated by measuring the static stability time, initial discoloration, transparency, fusion behavior and tensile strength of the modified PVC. The ionomers with proper lanthanum （La（III）） contents show a better thermal stability efficiency in comparison with traditional stabilizer lanthanum stearate. Meantime, they can accelerate PVC plasticization more efficiently than PMMA. The rigid PVC products stabilized with the ionomers present good transparency and enhanced tensile strength.

关键词： Rigid PVC Ionomers Thermal stability Plasticization Multifunction.

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Carbon quantum dots/BiVO_4 composite with enhanced photocatalytic activity

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Science China(Technological Sciences) 2019年第2期62卷 356-360页

作者： zhang ZhiJie HUANG HaiRui XU JiaYue zhang na zhang Cheng Institute of Crystal Growth School of Materials Science and Engineering Shanghai Institute of Technology

In this study, we report the facile fabrication of a carbon quantum dots(CQDs)/BiVO_4 composite with efficient photocatalytic activity. Due to the excellent upconversion photoluminescence, as well as the photo-induced electron transfer and reservoir properties of CQDs, the CQDs/BiVO_4 composite exhibited superior photocatalytic performance in the degradation of rhodamine B(RhB) under the irradiation of simulated solar light. This study provides a strategy for the development of high-performance catalysts based on CQDs.

关键词： carbon quantum dots BiVO4 photocatalysis composite electron transfer

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A New Cleaner Power Generation System Based on Self-Sustaining Supercritical Water Gasification of Coal

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Journal of Thermal Science 2022年第5期31卷 1380-1391页

作者： LIU Changchun HAN Wei WANG Zefeng zhang na Institute of Engineering Thermophysics Chinses Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China

A new cleaner power generation system(IPGS) is proposed and investigated in this paper. Integrating combined cycle with supercritical water gasification of coal, the thermodynamic energy of the produced syngas is cascade utilized according to its temperature and pressure, both sensible and latent heat of the syngas can be recycled into the system, and thereby the net power efficiency can be about 6.4 percentage points higher than that of the traditional GE gasification based power plant(GEPP). The exergy analysis results show that the exergy efficiency of the proposed system reaches 52.45%, which is 13.94% higher than that of the GEPP, and the improvement in exergy efficiency of the proposed system mainly comes from the exergy destruction decline in the syngas energy recovery process, the condensation process and the syngas purification process. The syngas combustion process is the highest exergy destruction process with a value of 157.84 MW in the proposed system. Further performance improvement of the proposed system lies in the utilization process of syngas. Furthermore, system operation parameters have been examined on the coal mass fraction in the supercritical water gasifier(GF), the gasification temperature, and the gasification pressure. The parametric analysis shows that changes in coal concentration in the GF exert more influence on the exergy efficiency of the system compared with the other two parameters.

关键词： power generation clean production supercritical water gasification coal gasification cascade utilization combined cycle

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Proposal and Assessment of an Engine-Based Distributed Steam and Power Cogeneration System Integrated with an Absorption-Compression Heat Pump

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Journal of Thermal Science 2020年第5期29卷 1165-1179页

作者： LIU Changchun HAN Wei WANG Zefeng zhang na Institute of Engineering Thermophysics Chinses Academy of SciencesBeijing 100190China Beijing Key Laboratory of Distributed Combined Cooling Heating and Power System Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Internal combustion engine-based poly-generation systems have been widely used for energy savings and emissions *** maximize their thermodynamic and environmental performance potentials,the efficient recovery of flue gas and jacket water heat is *** a conventional internal combustion engine-based steam and power cogeneration system,the low-temperature(less than 170°C)heat from flue gas and jacket water is usually directly discharged to the environment,which dramatically reduces the thermal and economic *** this work,a high-temperature heat pump is employed to recover this part of low-temperature heat for steam *** sensible heat of the flue gas and jacket water is cascade utilized in a steam generator and a heat *** results show that the process steam yield of the proposed system is almost doubled(increased by 703 kg/h)compared to that of an engine-based cogeneration system without a heat *** proposed system can reduce natural gas consumption,C 02 and NOx emissions by approximately 199069 m3,372.64 tons and 3.02 tons per year,respectively,with a primary energy ratio and exergy efficiency of 72.52%and 46.28%,***,the proposed system has a lower payback period with a value of 5.11 years,and the determining factors that affect the payback period are natural gas and electricity *** total net present value of the proposed system within its lifespan is 2441581 USD,and an extra profit of 785748 USD can be obtained compared to the reference *** is a promising approach for replacing gas boilers for process steam production in industrial sectors.

关键词： steam and power cogeneration HACHP ICE high-temperature heat pump

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