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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 Peninsula.This 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 analysis.The demands and living conditions are then classified and summarized through quantitative analysis,and their correlations are identified.Based 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 identified.Finally,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

A scheme for realizing nonreciprocal interlayer coupling in bilayer topological systems

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Frontiers of Optoelectronics 2023年第4期16卷 71-80页

作者： Xiaoxiao Wang Ruizhe Gu Yandong Li Huixin Qi Xiaoyong Hu Xingyuan wang Qihuang Gong State Key Laboratory for Mesoscopic Physics and Department of Physics Collaborative Innovation Center of Quantum Matter&Frontiers Science Center for Nano-OptoelectronicsBeijing Academy of Quantum Information SciencesPeking UniversityBeijing 100871China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Hefei National Laboratory Hefei 230088China College of Mathematics and Physics Beijing University of Chemical TechnologyBeijing 100029China

Nonreciprocal interlayer coupling is difcult to practically implement in bilayer non-Hermitian topological photonic systems.In this work,we identify a similarity transformation between the Hamiltonians of systems with nonreciprocal interlayer coupling and on-site gain/loss.The similarity transformation is widely applicable,and we show its application in one-and two-dimensional bilayer topological systems as examples.The bilayer non-Hermitian system with nonreciprocal interlayer coupling,whose topological number can be defned using the gauge-smoothed Wilson loop,is topologically equivalent to the bilayer system with on-site gain/loss.We also show that the topological number of bilayer non-Hermitian C6v-typed domaininduced topological interface states can be defned in the same way as in the case of the bilayer non-Hermitian Su–Schrieffer–Heeger model.Our results show the relations between two microscopic provenances of the non-Hermiticity and provide a universal and convenient scheme for constructing and studying nonreciprocal interlayer coupling in bilayer non-Hermitian topological systems.This scheme is useful for observation of non-Hermitian skin efect in three-dimensional systems.

关键词： Nonreciprocal Bilayer Interlayer coupling Topological photonics

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

Willingness of the General Public to Receive A COVID-19 Vaccine Booster—China,April–May 2021

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China CDC weekly 2022年第4期4卷 66-70页

作者： Xiaoxiao Wang Leyuan Liu Minyue Pei Xiaoguang Li Nan Li Research Center of Clinical Epidemiology Peking University Third HospitalBeijingChina Department of Infectious Diseases Peking University Third HospitalBeijingChina

Summary What is already known about this topic?A coronavirus disease 2019(COVID-19)vaccine booster is planned for administration to eligible individuals.Understanding the factors that influence attitudes towards the booster shot will help to identify groups that will most readily accept a booster dose.What is added by this report?Of the individuals polled,75.2%reported they would receive a booster shot.Sociodemographic characteristics influencing booster vaccine acceptance included age,gender,occupation,and education.Moreover,those who had been vaccinated against influenza,who believed herd immunity would be effective against severe acute respiratory syndrome coronavirus 2,and who reported reduced anxiety after vaccination were more likely to accept a booster dose.What are the implications for public health practice?A booster shot of the COVID-19 vaccine could be widely accepted.Communicating about the effectiveness of the COVID-19 vaccine and the impact of infection on people’s health could help increase public willingness to get a booster dose.

关键词： occupation immunity COV

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 challenging.Herein,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 kinetics.This 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 spectrum.Especially,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,respectively.Finally,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

Effects of High-Temperature Stress on Photosynthetic Characteristics and Antioxidant Enzyme System of Paeonia ostii

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Phyton-International Journal of Experimental Botany 2022年第3期91卷 599-615页

作者： Xiaoxiao Wang Ziwen Fang Daqiu Zhao Jun Tao College of Horticulture and Plant Protection Yangzhou UniversityYangzhou225009China Joint International Research Laboratory of Agriculture and Agri-Product Safety The Ministry of Education of ChinaYangzhou UniversityYangzhou225009China

Paeonia ostii is an economically important oil crop,which has been widely cultivated in the middle and lower reaches of the Yangtze River in China in recent years.Although P.ostii is highly adaptable to the environment,the prolonged high summer temperature in this region severely inhibits its growth,which adversely affects seed yield and quality.In this study,P.ostii plants were subjected to 20℃/15℃(day/night)and 40℃/35℃(day/night)temperatures for 15 days.The changes in physiological and biochemical indicators of P.ostii under high-temperature stress were initially investigated.The results showed that with the deepening of leaf etiolation,chlorophyll a and chlorophyll b concentration,carotenoid concentration,Soil Plant Analysis Development(SPAD)values and leaf relative water content decreased significantly,while both relative electrical conductivity(REC)and free proline concentration showed an upward trend.Meanwhile,the continuous accumulation of reactive oxygen species(ROS)in P.ostii plants,led to an increased activity of antioxidant enzymes including superoxide dismutase(SOD),peroxidase(POD),catalase(CAT)and ascorbate peroxidase(APX).Moreover,with the extension of the high-temperature treatment,the anatomical structures of P.ostii were destroyed,resulting in a decreased photochemical efficiency of the photosystem II(PSII)reaction center and photosynthesis was inhibited.Taken together,these results provide reference values for understanding the physiological response of P.ostii to hightemperature stress and establish a foundation for further research on the relevant underlying molecular mechanisms.

关键词： Antioxidant enzymes membrane damage photosynthesis reactive oxygen species

Investigation on insulation properties of HFO-1336mzz(E)and N_(2)/CO_(2)mixtures as SF_(6) substitutes in gas-insulated electrical applications

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High Voltage 2023年第1期8卷 48-58页

作者： Zhanyang Gao Yunbai Luo Ruichao Peng Xiaoxiao Wang Ping Yu Wenjun Zhou Engineering Research Center of Organosilicon Compounds&Materials Ministry of EducationCollege of Chemistry and Molecular SciencesWuhan UniversityWuhanChina School of Electrical Engineering and Automation Wuhan UniversityWuhanChina

The emissions of SF6 have been restricted owing to 3400 years of atmospheric lifetime and high global warming potential(GWP)as an insulating gas in gas-insulated electrical equipment.In this study,HFO-1336mzz(E)and N_(2)/CO_(2)mixtures are proposed as SF6 substitutes for their short atmospheric lifetime,low GWP and superior insulation performance.The GWP of HFO-1336mzz(E)is only 18 and its atmospheric lifetime is days to weeks.The breakdown voltage of 25%HFO-1336mzz(E)and N_(2)/CO_(2)mixtures is about 85%that of pure SF6 under alternating current.The self-recovery ability of HFO-1336mzz(E)and CO_(2)mixtures is superior to that of HFO-1336mzz(E)and N_(2)mixtures.The decomposition characteristic of HFO-1336mzz(E)shows that a tiny amount of its gas might initiate a carbonisation reaction to form carbon after multiple breakdown tests,which is verified by observations using energy dispersive X-rays spectroscopy and scanning electron microscope.The acute toxicity test of HFO-1336mzz(E)indicates that the gas is non-toxic.The results show that HFO-1336mzz(E)and N_(2)/CO_(2)mixtures are potential substitutes for SF6 in electrical applications.

关键词： SF6 electrical insulation

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 2013.The 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：大气CO2浓度洞穴滴水水化学中国西南古气候季节性变化开发土壤CO2

Fluoridation routes,function mechanism and application of fluorinated/fluorine-doped nanocarbon-based materials for various batteries:A review

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Journal of Energy Chemistry 2023年第10期85卷 363-393,I0011页

作者： Weicui Liu Nanping Deng Gang wang Ruru Yu Xiaoxiao Wang Bowen Cheng Jingge Ju Weimin Kang State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes School of Textile Science and EngineeringTiangong UniversityTianjin 300387China School of Material Science and Engineering Tiangong UniversityTianjin 300387China

With the popularity and widespread applications of electronics,higher demands are being placed on the performance of battery materials.Due to the large difference in electronegativity between fluorine and carbon atoms,doping fluorine atoms in nanocarbon-based materials is considered an effective way to improve the performance of used battery.However,there is still a blank in the systematic review of the mechanism and research progress of fluorine-doped nanostructured carbon materials in various batteries.In this review,the synthetic routes of fluorinated/fluorine-doped nanocarbon-based(CF_x)materials under different fluorine sources and the function mechanism of CF_x in various batteries are reviewed in detail.Subsequently,judging from the dependence between the structure and electrochemical performance of nanocarbon sources,the progress of CF_x based on different dimensions(0D–3D)for primary battery applications is reviewed and the balance between energy density and power density is critically discussed.In addition,the roles of CF_x materials in secondary batteries and their current applications in recent years are summarized in detail to illustrate the effect of introducing F atoms.Finally,we envisage the prospect of CF_x materials and offer some insights and recommendations to facilitate the further exploration of CF_x materials for various high-performance battery applications.

关键词： Nanocarbon materials Fluorinated/fluorine-doped effect Function mechanism Various batteries

Selection of Stable Reference Genes for Quantitative Real-Time PCR on Paeonia ostii T.Hong et J.X.Zhang Leaves Exposed to Different Drought Stress Conditions

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Phyton-International Journal of Experimental Botany 2022年第5期91卷 1045-1059页

作者： Yuting Luan Cong Xu Xiaoxiao Wang Daqiu Zhao Jun Tao College of Horticulture and Plant Protection Yangzhou UniversityYangzhou225009China Joint International Research Laboratory of Agriculture and Agri-Product Safety The Ministry of Education of ChinaYangzhou UniversityYangzhou225009China

The definition of relatively stable expressed internal reference genes is essential in both traditional blotting quantification and as a modern data quantitative strategy.Appropriate internal reference genes can accurately standardize the expression abundance of target genes to avoid serious experimental errors.In this study,the expression profiles of ten candidate genes,ACT1,ACT2,GAPDH,eIF1,eIF2,α-TUB,β-TUB,TBP,RNA Pol II and RP II,were calculated for a suitable reference gene selection in Paeonia ostii T.Hong et J.X.Zhang leaves under various drought stress conditions.Data were processed by the four regularly used evaluation software.A comprehensive analysis revealed that RNA Pol II was the most stable gene and eIF2 was the least stable one.In addition,the geNorm program provided the optimal choice of two reference gene combination,RNA Pol II andβ-TUB,for qRT-PCR normalization in P.ostii subjected to different drought stress levels.Our research provided convenience for gene expression analysis in P.ostii under drought stress and promoted research of effective methods to alleviate P.ostii drought stress in the future.

关键词： Paeonia ostii T.Hong et J.X.Zhang reference gene qRT-PCR drought stress