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A Practical Approach to Improve the MODIS MCD43A Products in Snow-Covered Areas

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Journal of Remote Sensing

Journal of Remote Sensing 2023年第1期3卷 231-246页

作者： Anxin Ding Ziti Jiao xiaoning zhang Yadong Dong Alexander AKokhanovsky Jing Guo Hailan Jiang School of Resources and Environmental Engineering Hefei University of TechnologyHefei 230009China State Key Laboratory of Remote Sensing Science Beijing Normal UniversityBeijing 100875China Faculty of Geographical Science Institute of Remote Sensing Science and EngineeringBeijing Normal UniversityBeijing 100875China School of Mechatronical Engineering Beijing Institute of TechnologyBeijing 100081China Aerospace Information Research Institute Chinese Academy of Sciences and University of Chinese Academy of SciencesBeijing 100083China German Research Center for Geosciences Telegrafenberg14473 PotsdamGermany

The MODerate Resolution Imaging Spectroradiometer(MODIS)MCD43A products have been extensively applied in the remote sensing field,but recent researchers have demonstrated that these products still had the potential to be further improved by using the latest development of the kernel-driven model[RossThick-LiSparseReciprocal-Snow(RTLSRS)]in snow-covered areas,since the MCD43A product algorithm[RossThick-LiSparseReciprocal(RTLSR)]needed to be improved for the accurate simulation of snow bidirectional reflectance distribution function(BRDF)*** this paper,we proposed a practical approach to improve the MCD43A products,which used the Polarization and Directionality of the Earth's Reflectance(POLDER)observations and random forest algorithm to establish the relationship between the BRDF parameters(MCD43A1)estimated by the RTLSR and RTLSRS *** applied this relationship to correct the MCD43A1 product and retrieve the corresponding albedo(MCD43A3)and nadir reflectance(MCD43A4).The results obtained highlight several aspects:(a)The proposed approach can perform well in correcting BRDF parameters[root mean square error(RMSE)=~0.04].(b)The corrected BRDF parameters were then used to retrieve snow albedo,which matched up quite well with the results of the RTLSRS model.(c)Finally,the snow albedo retrieved by the proposed approach was assessed using ground-based albedo *** indicated that the retrieved snow albedo showed a higher accuracy as compared to the station measurements(RMSE=0.055,bias=0.005),which was better than the results of the MODIS albedo product(RMSE=0.064,bias=-0.018),especially at large *** results demonstrated that this proposed approach presented the potential to further improve the MCD43A products in snow-covered areas.

关键词： BRDF reflectance signature

Management of triplet excitons transition:fine regulation of Förster and dexter energy transfer simultaneously

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Light(Science & Applications) 2024年第2期13卷 302-315页

作者： Jiaqiang Wang Yujie Yang Xinnan Sun xiaoning Li Liyao zhang Zhen Li Institute of Molecular Aggregation Science Tianjin UniversityTianjin300072China School of Life Sciences Tianjin UniversityTianjin300072China Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials Department of ChemistryWuhan UniversityWuhan430072China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430072China Joint School of National University of Singapore Tianjin UniversityInternational Campus of Tianjin UniversityBinhai New CityFuzhou350207China

Understanding and management of triplet excitons transition in the same molecule remain a great ***,for the first time,by host engineering,manageable transitions of triplet excitons in a naphthalimide derivative NDOH were achieved,and monitored through the intensity ratio(ITADF/IRTP)between thermally activated delayed fluorescence(TADF)and room-temperature phosphorescence(RTP).Energy differences between lowest triplet excited states of host and guest were changed from 0.03 to 0.17 eV,and ITADF/IRTP of NDOH decreased by 200 times,thus red shifting the afterglow *** was proposed that shorter conjugation length led to larger band gaps of host materials,thus contributing to efficient Dexter and inefficient Förster energy ***,no transition to singlet state and only strongest RTP with quantum yield of 13.9%could be observed,when PBNC with loosest stacking and largest band gap acted as *** work provides novel insight for the management and prediction of triplet exciton transitions and the development of smart afterglow materials.

关键词： materials transition transitions

A case study on Landscape Component Niche based on Landscape Pattern Indices: Yanchi,Ningxia Province, China

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Research in Cold and Arid Regions 2020年第1期12卷 22-33页

作者： xiaoning zhang XueLu Liu Ghanney Philip XiaoDan Li QuanXi Wang YaNan Xu TingTing Hui College of Resources and Environmental Sciences Gansu Agricultural UniversityLanzhouGansu 730070China College of Management Gansu Agricultural UniversityLanzhouGansu 730070China

Yanchi County is located in the agro-pastoral ecotone and belongs to the ecologically fragile area of Northwest *** is important to study the evolution of landscape pattern to curb its environmental *** order to intuitively show how the landscape pattern of the study area changes over time,Landsat Thematic Mappers(TM)and Landsat Operational Land Imager(OLI)data of 1991,2000,2010 and 2017 were *** paper attempts to apply niche theories and methods into landscape ecology,and constructs a niche model of landscape components by using"n-dimentional hypervolume niche theory"and landscape pattern *** evaluating the spatial and temporal evolution of niche from the perspective of two-dimensional space to reflect the changes of landscape pattern in the study area over the past 26 years,new theories and methods were introduced for the characterization of landscape *** results indicate that:1)The larger the attribute and dominance value of landscape components,the higher the ecological niche and the stronger the control effect on the overall landscape.2)The ecological niche of each landscape component was significantly different,just as its control effect on the overall landscape.3)The dynamic change of the ecological niche of each landscape component was different,with grassland,unused land and arable land always in a high dominant position,although the ecological niche of construction land and water area was always *** general,the introduction of niche theory into the landscape ecology provided a new method to study the changes in regional landscape pattern.

关键词： landscape pattern landscape component niche landscape stability landscape dominance

Development of Zn^(2+)-controlled expression system for lactic acid bacteria and its application in engineered probiotics

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Synthetic and Systems Biotechnology 2024年第1期9卷 152-158页

作者： xiaoning Xu Lingwen zhang Yue Cui Jian Kong Tingting Guo State Key Laboratory of Microbial Technology Shandong UniversityNo.72 Binhai RoadQingdao266237PR China

Lactococcus lactis and Streptococcus thermophilus are considered as ideal chassis of engineered probiotics,while food-grade genetic tools are limited in those ***,a Zn^(2+)-controlled gene expression(ZICE)system was identified in the genome of *** CGMCC7.179,including a transcriptional regulator sczAst and a promoter region of cation transporter czcD(PczcDst).Specific binding of the SczAst to the palindromic sequences in PczcDst was demonstrated by EMSA analysis,suggesting the regulation role of SczAst on *** evaluate their possibility to control gene expression in vivo,the sczAst-PczcDst was employed to drive the expression of green fluorescence protein(GFP)gene in *** NZ9000 and *** CGMCC7.179,*** of the transformants could express GFP under Zn^(2+)induction,while no fluorescence without Zn^(2+)*** optimal conditions,Zn^(2+)was used at a final concentration of 0.8 mM in *** and 0.16 mM in *** at OD600 close to 0.4,and omitting yeast extract powder in the medium unexpectedly improved GFP expression level by *** the help of the ZICE system,engineered *** and *** strains were constructed to secret cytokine interleukin-10(IL-10)with immunogenicity,and the IL-10 content in the supernatant of the engineered *** was 59.37%of that under the nisin controlled expression *** study provided a tightly controlled expression system by the food-grade inducer Zn^(2+),having potential in development of engineered probiotics.

关键词： Lactococcus lactis Streptococcus thermophilus Food-grade expression system Engineered probiotic

电针中脘穴对大鼠胃内酸刺激诱导的胃伤害性反应的影响及其机制研究

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中医杂志 2024年第2期65卷 213-218页

作者：石宏杨兆坤王晓宇何伟宿杨帅张晓宁万红叶曲正阳景向红中国中医科学院针灸研究所北京市100700 北京市海淀区西北旺镇社区卫生服务中心

目的观察电针中脘穴对胃内酸刺激诱导的胃伤害性反应的影响并探讨与延髓内脏感觉和内脏运动核团神经元相关的作用机制。方法20只SD大鼠均以0.5 mol/L稀盐酸0.5 ml/100 g灌胃以诱导胃伤害性反应,随机选出8只统计灌胃前1 min与灌胃后第1、... 详细信息

目的观察电针中脘穴对胃内酸刺激诱导的胃伤害性反应的影响并探讨与延髓内脏感觉和内脏运动核团神经元相关的作用机制。方法20只SD大鼠均以0.5 mol/L稀盐酸0.5 ml/100 g灌胃以诱导胃伤害性反应,随机选出8只统计灌胃前1 min与灌胃后第1、5、10、15、20、25、30、35、40、45、50、55、60 min胃平滑肌肌电慢波信号(GSW)曲线下面积,以及延髓孤束核(NTS)和迷走神经背核(DMV)神经元细胞外放电频率;剩余12只大鼠于稀盐酸灌胃后5~25 min内给予中脘穴电针干预持续1 min,比较电针干预前后各1 min内GSW曲线下面积以及NTS和DMV神经元细胞外放电频率。结果与灌胃前比较,GSW曲线下面积在灌胃后第1、5、10、15、20、25 min明显增加,NTS兴奋性神经元(占比90%,57/63)细胞外放电频率在灌胃后第1、5、10、15、20、25、30、35、40 min明显升高,且均在灌胃后第1 min达到峰值(P0.05),其余时间点均明显降低(P0.05)。结论电针中脘穴可以改善胃内酸刺激诱导的胃伤害性反应,其可能通过减少内脏感觉的传入信息降低延髓NTS神经元的兴奋性而发挥作用。

关键词：胃伤害性反应酸刺激中脘穴电针孤束核迷走神经背核

Root microbiota shift in rice correlates with resident time in the field and developmental stage

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Science China(Life Sciences) 2018年第6期61卷 613-621页

作者： Jingying zhang Na zhang Yong-Xin Liu xiaoning zhang Bin Hu Yuan Qin Haoran Xu Hui Wang Xiaoxuan Guo Jingmei Qian Wei Wang Pengfan zhang Tao Jin Chengcai Chu Yang Bai State Key Laboratory of Plant Genomics Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing 100101 China CAS-JIC Centre of Excel'lence for Plant and Microbial Science (CEPAMS) Institute of Genetics and Developmental Biology Chinese Academy of Sciences (CAS) Beijing 100101 China College of Life Sciences University of Chinese Academy of Sciences Beijing 100039 China China National Genebank-Shenzhen BGI-Shenzhen Shenzhen 518083 China BGI-Qingdao Qingdao 266510 China

Land plants in natural soil form intimate relationships with the diverse root bacterial microbiota. A growing body of evidence shows that these microbes are important for plant growth and health. Root microbiota composition has been widely studied in several model plants and crops; however, little is known about how root microbiota vary throughout the plant's life cycle under field conditions. We performed longitudinal dense sampling in field trials to track the time-series shift of the root microbiota from two representative rice cultivars in two separate locations in China. We found that the rice root microbiota varied dramatically during the vegetative stages and stabilized from the beginning of the reproductive stage, after which the root microbiota underwent relatively minor changes until rice ripening. Notably, both rice genotype and geographical location influenced the patterns of root microbiota shift that occurred during plant growth. The relative abundance of Deltaproteobacteria in roots significantly increased overtime throughout the entire life cycle of rice, while that of Betaproteobacteria, Firmicutes, and Gammaproteobacteria decreased. By a machine learning approach, we identified biomarker taxa and established a model to correlate root microbiota with rice resident time in the field(e.g., Nitrospira accumulated from 5 weeks/tillering in field-grown rice). Our work provides insights into the process of rice root microbiota establishment.

关键词： rice root microbiota time-series shift biomarker taxa residence time in the field developmental stages modeling machine learning

Ballistic performance of spaced multi-ply soft fabrics: Experimental and numerical investigation

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Defence Technology（防务技术） 2024年第4期34卷 143-155页

作者： Zhongwei zhang xiaoning Yang Yuan Lin Ziming Xiong Yuhang Xiang Yi Zhou Mingyang Wang State Key Laboratory of Explosion&Impact and Disaster Prevention&Mitigation Army Engineering University of PLANanjing 210007China School of Mechanical Engineering Nanjing University of Science&TechnologyNanjing 210007China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200China Postdoctoral Station of Civil Engineering Army Engineering University of PLANanjing 210007China

It has been reported that the ply gap influences the ballistic resistance of spaced multi-ply fabric systems,but its working mechanism was not well-understood. This paper reports the experimental and numerical approaches and results of an investigation on the mechanisms that enable the improved ballistic performance of spaced multi-ply systems. Penetration tests were performed over a range of impact velocities ranging from 200 m/s to 400 m/s. The results confirmed that the ply gap is beneficial to the energy absorption capability of the systems. This is because the front plies tend to absorb more energy when they are not immediately constrained by the rear plies. During a ballistic event, the gap relieves the reflection of the compressive pulse, prolonging the projectile engagement time with the front plies;on the other hand, the rear plies become increasingly less active in dissipating energy as the gap *** the gap is sufficiently widened to avoid any interference between the plies before the failure of the front ply, the responses of the whole system no longer vary. It was also found that the ballistic performance of the spaced systems is influenced by ply thickness, impact velocity, and the stacking order of the ply gap.

关键词： Energy absorption capability Ply gap Ballistic performance The front ply The rear ply

Natural Factors Influencing Blown Sand Hazards in Beijing

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International Journal of Disaster Risk Science 2011年第2期2卷 23-31页

作者： Lianyou Liu Peijun Shi Xia Hu Tianke Liu Lanlan Guo Xiaoxiao zhang Yan Tang Yanli Lv BingyanSun Guoming zhang xiaoning zhang Weiqiang zhang Yanyan Yang Jingpu Wang Yiying Xiong Key Laboratory of Environmental Change and Natural Disasters Ministry of Education of ChinaBeijing Normal UniversityBeijing 100875China State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China

In this article, natural factors in the farmingpastoral ecotone that might have influenced the blown sand hazards in Beijing in 2000 are analyzed. In the farmingpastoral ecotone, blown sand activities took place primarily in springtime, during which 39.8 percent of the annual frequency of erosive winds above threshold occurred. The prevailing directions of the erosive winds were NNW, NW, NWW, and N, with frequencies of 47, 20, 13, and 9 percent respectively. Sand entrainment and dust emission are influenced by erosive wind frequency, soil moisture, and land use and cover change. Favorable wind characteristics and a lasting drought in 1999 and 2000 may have produced ideal conditions for land surface desiccation, vegetation degradation, and land surface mobility and the occurrence of intense sand-and dust storms in Beijing.

关键词： winds moisture drought

Host-Associated Quantitative Abundance Profiling Reveals the Microbial Load Variation of Root Microbiome

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Plant Communications 2020年第1期1卷 147-163页

作者： Xiaoxuan Guo xiaoning zhang Yuan Qin Yong-Xin Liu Jingying zhang Na zhang Kun Wu Baoyuan Qu Zishan He Xin Wang Xinjian zhang Stephane Hacquard Xiangdong Fu Yang Bai State Key Laboratory of Plant Genomics Institute of Genetics and Developmental BiologyInnovation Academy for Seed DesignChinese Academy of Sciences(CAS)Beijing 100101China CAS-JIC Centre of Excellence for Plant and Microbial Science(CEPAMS) Institute of Genetics and Developmental BiologyChinese Academy of Sciences(CAS)Beijing 100101China College of Advanced Agricultural Sciences University of Chinese Academy of SciencesBeijing 100039China State Key Laboratory of Plant Cell and Chromosome Engineering Institute of Genetics and Developmental BiologyInnovation Academy for Seed DesignChinese Academy of Sciences(CAS)Beijing 100101China College of Life Sciences University of Chinese Academy of SciencesBeijing100049China Shandong Provincial Key Laboratory of Applied Microbiology Ecology InstituteQilu University of Technology(Shandong Academy of Sciences)Jinan 250014China Max Planck Institute for Plant Breeding Research Cologne 50829Germany

Plant-associated microbes are critical for plant growth and survival under natural environmental *** date,most plant microbiome studies involving high-throughput amplicon sequencing have focused on the relative abundance of microbial ***,this technique does not assess the total microbial load and the abundance of individual microbes relative to the amount of host plant ***,we report the development of a host-associated quantitative abundance profiling(HA-QAP)method that can accurately examine total microbial load and colonization of individual root microbiome members relative to host plants by the copy-number ratio of microbial marker gene to plant *** validate the HAQAP method using mock experiments,perturbation experiments,and metagenomic *** HA-QAP method eliminates the generation of spurious outputs in the classical method based on microbial relative abundance,and reveals the load of root microbiome to host *** the HA-QAP method,we found that the copy-number ratios of microbial marker genes to plant genome range from 1.07 to 6.61 for bacterial 16S rRNA genes and from 0.40 to 2.26 for fungal internal transcribed spacers in the root microbiome samples from healthy rice and ***,using HA-QAP we found that an increase in total microbial load represents a key feature of changes in root microbiome of rice plants exposed to drought stress and of wheat plants with root rot disease,which significantly influences patterns of differential taxa and species interaction *** its accuracy and technical feasibility,HA-QAP would facilitate our understanding of genuine interactions between root microbiome and plants.

关键词： microbial load host-associated quantitative abundance profiling root microbiome