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Humble Opinions on the Relationship between the Percentage of Urban Residents in an Urban Region and the Economic Status in This Region in China

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Chinese Journal of Population,Resources and Environment 2007年第4期5卷 57-63页

作者： wang xiaoxiao Urban and Regional Planning Program School of Planning Design and Construction Michigan State University East Lansing Michigan 48824 U.S.A.

It is a fact that in U.S. the immigration between rural areas and city areas is free, but in China this type of immigration is restricted by HUKOU system (Hukou, namely the household registration system, was designed to control rural-urban in China). All of those national policies in city areas are much better than those in rural areas, so those corresponding differences bring about great discrepancy of the economic status (mainly including GDP per person and income per resident) between rural and city areas in the same urban region, especially in different urban re- gions because the percentage of urban residents in those urban regions is in-equable. The present paper mainly researches the topic of relationship between the percentage of urban residents and the economic status in an urban region in China, including the relationship between the economic and the political functions of a settlement in China during the process of urbanization.

关键词： percentage of urban residents GDP per person in-come per resident urban region

Analysis on Public Transportation Influences on Real Estate Development in East Lansing

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Geo-Spatial Information Science 2011年第1期14卷 73-78页

作者： wang xiaoxiao YAN Jie College of Architecture Illinois Institute of Technology 60616 USA School of Planning Design and Construction Michigan State University 48824 USA

The purpose for this article is to research the relationship between public transportation and real estate based on the area of East *** methods are mainly used to analyze the data:correlation analysis and means analysis with the help of Statistical Package for the Social Sciences(SPSS) data analyzing *** are two analysis results:(1) the real estate,which is closer to public transportation,will have higher value than that is far from public transportation,and(2) the number of bus in one bus stop has no obvious relation with the value of real *** on these results,real estate developers could build residential real estate close to public transportation or bring public transportation in their real estate community by contract with transportation *** sum,they should reasonably use public transportation as attractive features to convince people to prefer to their houses.

关键词： public transportation real estate value East Lansing

Influences of air CO2 on hydrochemistry of drip water and implications for paleoclimate study in a stream-developed cave, SW China

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Acta Geochimica 2016年第2期35卷 172-183页

作者： xiaoxiao wang Yanhong Wu Licheng Shen Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China University of Chinese Academy of Sciences Beijing 100049China School of Geographical Sciences Southwest UniversityChongqing 400715 China

Cave air CO_2 is a vital part of the cave environment. Most studies about cave air CO_2 variations are performed in caves with no streams; there are few studies to date regarding the relationship of cave air CO_2 variations and drip water hydrochemistry in underground stream–developed caves. To study the relationship of underground stream, drip water, and cave air CO_2, monthly and daily monitoring of air CO_2 and of underground stream and drip water was performed in Xueyu Cave from 2012 to *** results revealed that there was marked seasonal variation of air CO_2 and stream hydrochemistry in the cave. Daily variations of cave air CO_2, and of stream and drip water hydrochemistry, were notable during continuous monitoring.A dilution effect was observed by analyzing hydrochemical variations in underground stream and drip water after rainfall. High cave air CO_2 along with low p H and low δ^(13)C DIC in stream and drip water indicated that air CO_2 was one of the dominant factors controlling stream and drip water hydrochemistry on a daily scale. On a seasonal scale, stream flows may promote increased cave air CO_2 in summer; in turn, the higher cave air CO_2 could inhibit degassing of drip water and make calcite δ^(13)C more negative. Variation of calcite δ^(13)C(precipitated from drip water) was in reverse of monthly temperature, soil CO_2, and cave air CO_2. Therefore,calcite δ^(13)C in Xueyu Cave could be used to determine monthly changes outside the cave. However, considering the different precipitation rate of sediment in different seasons,it was difficult to use stalagmites to reconstruct environmental change on a seasonal scale.

关键词： Carbon dioxide - Underground stream Dripwater Paleoclimate reconstruction Xueyu Cave

3D particle streak velocimetry by defocused imaging

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Particuology 2023年第1期72卷 1-9页

作者： Xiangrui Dong xiaoxiao wang Wu Zhou Fangting wang Xinran Tang Xiaoshu Cai School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer for Power Engineering Shanghai 200093China

Particle streak velocimetry (PSV) has become one of the important branches of flow filed measurements. It extracts velocity information from particle trajectories captured by single frame long exposure images. Since the defocus of moving particle is inevitable during a long exposure time and under a large magnification, a novel three-dimensional (3D) velocity measurement method named defocusing particle streak velocimetry (DPSV) is proposed in this paper. On the one hand, an extension from two-dimensional (2D) to 3D velocity measurement with a monocular system is carried out. The depth information of the particle, which reflects the position in the third dimension, is indicated by the defocusing degree (characteristic parameter σ) of the particle images. The variation of σ along the trajectory is recognized by surface fitting of the gray value distribution of particle images, assuming that σ varies linearly along the trajectory. On the other hand, based on the linear fitting for the straight trajectory, an arc fitting model is developed for curved trajectories which are commonly captured in turbulent flow. The relationship between σ and the particle depth position z is experimentally calibrated using a LED light and a diaphragm. Finally, the DPSV method is verified in a submerged jet flow field as well as in a microchannel flow field to obtain the 3D velocity field with single monocular system.

关键词： Defocusing particle streak velocimetry Curve trajectory Three-dimensional velocity Gray value distribution

Study on Confined Impinging Jet Mixer and Mechanism of Flash Nanoprecipitation

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China Petroleum Processing & Petrochemical Technology 2017年第3期19卷 32-37页

作者： Cao Shuyan Xu Xu wang xiaoxiao School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002

Nanoparticles have been given considerable attention and applied in many fields because of their properties that are superior to and more distinct than those of conventional materials. In practice, a stable and reproducible manufacturing process is highly desirable. This review presents the flash nanoprecipitation, a new technique that can rapidly produce nanoparticles. Moreover, the mixing process, the mechanism of particle formation, and the mixer design are ***, the factors controlling the size stability of the produced nanoparticles are summarised in this review.

关键词： flash nanoprecipitation mechanism particle stability

Double-uncertainty optimal operation of hybrid AC/DC microgrids with high proportion of intermittent energy sources

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Journal of Modern Power Systems and Clean Energy 2017年第6期5卷 838-849页

作者： Peng LI Pengfei HAN Shuai HE xiaoxiao wang Department of Electrical and Electronic Engineering North China Electric Power UniversityBaoding 071003Hebei ProvinceChina

This paper applies double-uncertainty optimization theory to the operation of AC/DC hybrid microgrids to deal with uncertainties caused by a high proportion of intermittent energy sources.A fuzzy stochastic expectation economic model for day-ahead scheduling based on uncertain optimization theory is proposed to minimize the operational costs of hybrid AC/DC *** fuzzy stochastic alternating direction multiplier method is proposed to solve the double-uncertainty optimization problem.A real-time intra-day unbalanced power adjustment model is established to minimize real-time adjustment *** comparative analysis of deterministic optimization,stochastic optimization and fuzzy stochastic optimization of day-ahead scheduling and real-time adjustment,the validity of fuzzy stochastic optimization based on a fuzzy stochastic expectation model is proved.

关键词： Double-uncertainty optimization Fuzzy stochastic ADMM Fuzzy stochastic expected value model High proportion of intermittent energy sources Hybrid AC/DC microgrid

Understanding the sluggish and highly variable transport kinetics of lithium ions in LiFePO_4

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Science China Chemistry 2023年第11期66卷 3297-3306页

作者： Youcheng Hu xiaoxiao wang Peng Li Junxiang Chen Shengli Chen Hubei Electrochemical Power Sources Key Laboratory Department of ChemistryWuhan UniversityWuhan 430072China CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

LiFePO_(4),one of the mainstream cathode materials of current EV batteries,exhibits experimental diffusion coefficients(D_(c))of Li^(+)which are not only several orders of magnitude lower than those predicted by the ionic hopping barriers obtained from theoretical calculations and spectroscopic measurements,but also span several orders from 10^(-14)to 10^(-18)cm^(2)s^(-1)under different states of charge(SOC)and the charging rates(C-rates).Atomic level understanding of such sluggishness and diversity of Li^(+)transport kinetics would be of significance in improving the rate performance of LiFePO_(4)through material and operation optimization but remain ***,we show that the high sensitivity of Li^(+)hopping barriers on the local Li–Li coordination environments(numbers and configurations)plays a key role in the ion transport *** is due a neural network-based deep potential(DP)which allows accurate and efficient calculation of hopping barriers of Li^(+)in LiFePO_(4)with various Li–Li coordination environments,with which the kinetic Monte-Carlo(KMC)method was employed to determine the D_(c)values at various C-rates and SOC across a broad ***,an accelerated KMC simulation strategy is proposed to obtain the D_(c)values under a wide range of SOC at low C-rates,which agree well with that obtained from the galvanostatic intermittent titration technique(GITT).The present study provides accurate descriptions of Li^(+)transport kinetics at both very high and low C-rates,which remains challenging to experiments and first-principles calculations,***,it is revealed that the gradient distributions of Li^(+)density along the diffusion path result in great asymmetry in the barriers of the forward and backward hopping,causing very slow diffusion of Li^(+)and the diverse variation of D_(c).

关键词： lithium iron phosphate diffusion coefficient machine-learning potential kinetic Monte Carlo simulations

Mo-doped Na3V2（PO4）3@C composites for high stable sodium ion battery cathode

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Frontiers of Materials Science 2018年第1期12卷 53-63页

作者： xiaoxiao wang Wanwan wang Baichuan ZHU Fangfang QIAN Zhen FANG College of Chemistry and Materials Science The Key Laboratory of Functional Molecular Solids (Ministry of Education) Anhui Laboratory of Molecule-Based Materials Center for Nano Science and Technology Anhui Normal University Wuhu 241000 China Division of Nanomaterials and Chemistry Hefei National Laboratory for Physical Sciences at the Microscale Department of Chemistry University of Science and Technology of China Hefei 230026 China

NASlCON-type Na3V2（PO4）3 （NVP） with superior electrochemical perfor- mance has attracted enormous attention with the development of sodium ion batteries. The structural aggregation as well as poor conductivity of NVP hinder its application in high rate perforamance cathode with long stablity. In this paper, Na3V2-xMox（PO4）3@C was successfully prepared through two steps method, including sol-gel and solid state thermal reduction. The optimal doping amount of Mo was defined by experiment. When x was 0.15, the Na3V1.85Mo0.15（PO4）3@C sample has the best cycle performance and rate performance. The discharge capacity of Na3V1.85Mo0.15（PO4）3@C could reach 117.26 mA.h.g-1 at 0.1 C. The discharge capacity retention was found to be 94.5% after 600 cycles at 5 C.

关键词： energy storage materials doping electrochemical reactions Na ionbattery

Optimization of furniture configuration for residential living room spaces in quality elderly care communities in Macao

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Frontiers of Architectural Research 2022年第2期11卷 357-373页

作者： xiaoxiao wang Ruiting Shi Fangru Niu Faculty of Humanities&Arts Macao University of Science and TechnologyMacao 999078China Faculty of Humanities and Social Sciences City University of MacaoMacao 999078China

The living conditions in Macao are characterized by a dense population,a land shortage,and old residences,especially on the Macao *** work investigates the demands and living conditions of different types of aged residents of the Youhan Community of Macao through a questionnaire survey and research *** demands and living conditions are then classified and summarized through quantitative analysis,and their correlations are *** on ergonomics and the physical,psychological,and behavioral patterns of aged people,issues that require attention when configuring furniture for different types of aged people in their residential living spaces are ***,several criteria for interior furniture configuration for different types of aged people are proposed by integrating the demands of different types of aged people with the concerns that need attention.A preliminarily quantifiable model is then proposed for living room furniture configuration from the perspective of aged people.

关键词： Macao Aged people Ergonomics Furniture configuration