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Optimal Operation Strategy Analysis with Scenario Generation Method Based on Principal Component Analysis,Density Canopy,and K-medoids for Integrated Energy Systems

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 89-100页

作者： Bingtuan Gao Yunyu Zhu yuanmei li School of Electrical Engineering Southeast UniversityNanjingChina

The operation of integrated energy systems(IESs)is confronted with great challenges for increasing penetration rate of renewable energy and growing complexity of energy forms.Scenario generation is one of ordinary methods to alleviate the system uncertainties by extracting several typical scenarios to represent the original high-dimensional data.This paper proposes a novel representative scenario generation method based on the feature extraction of panel data.The original high-dimensional data are represented by an aggregated indicator matrix using principal component analysis to preserve temporal variation.Then,the aggregated indicator matrix is clustered by an algorithm combining density canopy and K-medoids.Together with the proposed scenario generation method,an optimal operation model of IES is established,where the objective is to minimize the annual operation costs considering carbon trading cost.Finally,case studies based on the data of Aachen,Germany in 2019 are performed.The results indicate that the adjusted rand index(ARI)and silhouette coefficient(SC)of the proposed method are 0.6153 and 0.6770,respectively,both higher than the traditional methods,namely K-medoids,K-means++,and density-based spatial clustering of applications with noise(DBSCAN),which means the proposed method has better accuracy.The error between optimal operation results of the IES obtained by the proposed method and all-year time series benchmark value is 0.1%,while the calculation time is reduced from 11029 s to 188 s,which verifies that the proposed method can be used to optimize operation strategy of IES with high efficiency without loss of accuracy.

关键词： Scenario generation principal component analysis(PCA) density canopy K-medoids integrated energy system

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Drainage of paddy terraces impacts structures and soil properties in the globally important agricultural heritage of Hani Paddy Terraces,China

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International Soil and Water Conservation Research 2024年第1期12卷 64-76页

作者： Ming Wang li Rong Yanbo li Jiangcheng Huang yuanmei Jiao Xiaoyan Wei Institute of International Rivers and Eco-Security Kunming650500China Yunnan Key Laboratory of International Rivers and Transboundary Eco-Security Kunming650500China Power China Kunming Engineering Corporation limited Kunming650051China Department of Geography Yunnan Normal UniversityKunming650500China Yunnan Provincial Archives of Surveying and Mapping(Yunnan Provincial Geomatics Centre) Kunming650032China

Marginalization and abandonment of paddy terraces are widespread,but their effects on the sustainability of subsequent agricultural production are still unknown.Hani Paddy Terraces,included in Globally Important Agriculture Heritage Systems,are threatened by paddy fields drainage.Here,changes in terrace structure,the productivity of topsoil(0-20 cm),and soil water holding capacity at 0-70 cm depth were determined in a case study of Hani Paddy Terraces in Amengkong River Basin in Yuanyang County in Southwestern China,which had been converted into dryland terraces for 2-14 years.Our results showed that:(1)The degree of terrace structures degradation exhibited a U-shaped curve with increasing time since draining,with those drained for 5-9 years having the best structure;(2)Soil productivity index decreased first and then increased with time after conversion;(3)Maximum water holding capacity at 0-70 cm soil depth dramatically decreased after conversion and such trend became increasingly obvious with increasing time since conversion.Our study revealed that drainage of paddy terraces along with associated changes in crop and field management led to an increase in soil productivity,but degradation of terrace structures and a decrease in water holding capacity will inhibit restoration to paddy terraces.These findings enhance the understanding of the biophysical changes due to marginalization in paddy terraces.

关键词： Hani paddy terraces Terraces marginalization Terrace structure degradation Soil productivity Water holding capacity

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乙型肝炎病毒整合DNA在慢性乙型肝炎中的作用研究进展

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中华肝脏病杂志 2024年第2期32卷 164-167页

作者：陈媛美刘锦朱传武朱莉苏州大学附属传染病医院肝病科苏州215131 苏州大学附属传染病医院感染科苏州2215131 苏州大学医学院苏州215131

乙型肝炎病毒(HBV)慢性感染会导致患者发生肝硬化、肝细胞癌的概率大大增加。现有的抗病毒治疗方案虽然对延缓病情进展,改善预后有一定的作用,但仍不能有效地达到功能性治愈。整合HBV DNA可能是造成该现象的原因之一。因此,现就整合HBV ... 详细信息

乙型肝炎病毒(HBV)慢性感染会导致患者发生肝硬化、肝细胞癌的概率大大增加。现有的抗病毒治疗方案虽然对延缓病情进展,改善预后有一定的作用,但仍不能有效地达到功能性治愈。整合HBV DNA可能是造成该现象的原因之一。因此,现就整合HBV DNA在维持肝脏慢性炎症,逃避现有的抗病毒治疗手段并且诱导肝细胞癌的可能作用机制进行综述,进一步加深对整合HBV DNA在慢性乙型肝炎发生和发展中作用的认识,为制定更优治疗策略提供思路和参考。

关键词：乙型肝炎病毒整合HBV DNA 慢性乙型肝炎病毒感染病毒复制功能性治愈

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Asymmetric expression of CA2 and CA13 linked to calcification in the bilateral mandibular condyles cause crossed beaks in chickens

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Journal of Integrative Agriculture 2024年第7期23卷 2379-2390页

作者： Lei Shi Yanyan Sun Yunlei li Hao Bai Jingwei Yuan Hui Ma yuanmei Wang Panlin Wang Aixin Ni linlin Jiang Pingzhuang Ge Shixiong Bian Yunhe Zong Jinmeng Zhao Adamu MIsa Hailai HTesfay Jilan Chen State Key Laboratory of Animal Biotech Breeding/Key Laboratory of Animal(Poultry)Genetics Breeding and Reproduction of Ministry of Agriculture and Rural Affairs/Institute of Animal Sciences Chinese Academy of Agricultural SciencesBeijing 100193China College of Animal Science and Technology Hebei Agricultural UniversityBaoding 071001China Joint International Research Laboratory of Agriculture and Agri-Product Safety Ministry of Education/Institutes of Agricultural Science and Technology DevelopmentYangzhou UniversityYangzhou 225009China

Crossed beak is a complex mode of inheritance with prevalence ranging from 0.2 to 7.4%in at least 12 chicken strains worldwide.To reveal the intrinsic factors causing crossed beaks,genes expression patterns in bilateral mandibular condyle between affected and normal birds were characterized by RNA sequencing analysis in the present studies.Crossed beak was induced by short length of unilateral mandibular ramus,and a total of 110 differentially expressed genes were up-or down-regulated in the affected(short)mandibular condyle side as compared to the normal side.Carbonic anhydrase 2(CA2)and Carbonic anhydrase 13(CA13)were enriched in the carbonate dehydratase activity,and high-expressed in mandibular condyle and osteoblasts(P<0.05).However,both were low-expressed in short mandibular condyle side of affected birds(P<0.05).The carbonate dehydratase inhibitor experiments confirmed that there is positive association between the calcification and carbonic anhydrase isoenzymes.Quantitative analysis with cetylpyridinium chloride showed a decrease in calcification when the cells were transfected with an anti-CA13 shRNA.Our research suggested that CA2 and CA13 are down-calcified in shortside mandibular condyle,and caused mandibular ramus to grow slowly.CA2 and CA13 have the critical role in crossed beaks by regulating calcification of mandibular condyle.

关键词： chicken crossed beak carbonic anhydrase calcification CA2 CA13

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气候变化和人类活动对环塔里木盆地植被覆盖度的影响

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东北林业大学学报 2024年第5期52卷 75-81页

作者：张元梅孙桂丽鲁艳李利新疆农业大学乌鲁木齐830052 中国科学院新疆生态与地理研究所

塔里木盆地生态系统脆弱,易受到人类活动的影响,植被对维持塔里木盆地生态系统稳定性具有极其重要的作用。以塔里木盆地边缘的绿洲区域、绿洲外围植被分布区及塔克拉玛干沙漠公路周围植被分布区作为研究区域,将植被覆盖度(FVC)作为反映... 详细信息

塔里木盆地生态系统脆弱,易受到人类活动的影响,植被对维持塔里木盆地生态系统稳定性具有极其重要的作用。以塔里木盆地边缘的绿洲区域、绿洲外围植被分布区及塔克拉玛干沙漠公路周围植被分布区作为研究区域,将植被覆盖度(FVC)作为反映植被变化的监测指标,利用归一化植被指数(NDVI)、气温、降水、植被类型数据,采用像元二分模型、一元线性回归法、残差分析等方法,分析了植被覆盖度的时空变化,以及气候变化和人类活动对环塔里木盆地、各植被类型植被覆盖度的影响。结果表明:(1)2000—2022年环塔里盆地植被覆盖度每10年增长0.008,各植被类型的植被覆盖度均呈现上升趋势,空间上植被覆盖度呈现“北高南低”的分布格局。气候变化影响的大部分区域植被覆盖度基本不变,人类活动影响的植被覆盖度以改善为主;(2)植被覆盖度的变化主要由气候变化和人类活动共同主导,但人类活动的影响大于气候变化。气候变化和人类活动共同作用时,植被覆盖度改善和退化的面积占比分别为19.79%、49.55%;(3)在植被覆盖度改善区,人类活动的相对贡献率整体较高。在植被覆盖度退化区,气候变化对绿洲区域内植被的相对贡献率更高,在绿洲区域外人类活动的相对贡献率更高。

关键词：环塔里木盆地植被覆盖度气候变化人类活动

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“透物见人”赋予西藏考古人文温度

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China's Tibet 2023年第2期34卷 37-40页

作者： li yuanmei 不详

In 1984,Shaanxi Province dispatched an archeological study team to Xizang to conduct the first general survey of cultural relics across the autonomous region.This was also known as the second nationwide general survey... 详细信息

关键词： nationwide ARCH autonomous

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昆仑山北坡两种优势荒漠灌木的生物量预测模型

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干旱区研究 2024年第2期41卷 284-292页

作者：张元梅孙桂丽鲁艳李利张志浩张栋栋新疆农业大学林学与风景园林学院新疆乌鲁木齐830052 干旱区林业生态与产业技术重点实验室新疆乌鲁木齐830052 中国科学院新疆生态与地理研究所新疆荒漠植物根系生态与植被修复重点实验室新疆乌鲁木齐830011 新疆策勒荒漠草地生态系统国家野外科学观测研究站新疆策勒848300 石河子大学生命科学学院新疆石河子832003

构建数学模型是估算灌木生物量的重要方法之一。本研究以中昆仑山北坡山前荒漠带常见的两种荒漠灌木红砂(Reaumuria soongarica)和合头草(Sympegma regelii)为研究对象。采用全株收获法采集植株,分别以株高(H)、冠幅面积(S)、植株体积(V... 详细信息

构建数学模型是估算灌木生物量的重要方法之一。本研究以中昆仑山北坡山前荒漠带常见的两种荒漠灌木红砂(Reaumuria soongarica)和合头草(Sympegma regelii)为研究对象。采用全株收获法采集植株,分别以株高(H)、冠幅面积(S)、植株体积(V)为自变量,植株地上生物量(W_(1))、地下生物量(W_(2))、全株生物量(W_(3))为因变量,建立函数模型,选取决定系数(R^(2))、估计标准差(SEE)、回归检验显著水平(P值)为评价指标,以P<0.001为前提,选取R^(2)尽量大、SEE尽量小的模型为红砂和合头草生物量最优预测模型。结果显示:红砂和合头草的生物量最优预测模型均为二次函数模型,合头草全株最优预测模型为一次函数模型除外。红砂植株体积(V)与生物量的相关性最高,生物量最优预测模型R^(2)为0.820~0.920。合头草冠幅面积(S)与生物量相关性最高,生物量最优预测模型R^(2)为0.935~0.973。红砂和合头草生物量最优预测模型均通过(P<0.001)显著性检验,拟合率在84.1%~95.6%之间,可用于生物量估算,本研究为预测荒漠生态系统碳储量和评价碳汇潜力提供科学依据。

关键词：荒漠灌木生物量预测模型昆仑山

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Characters on the Poverty Alleviation Frontline in Chamdo

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China's Tibet 2020年第4期31卷 59-66页

作者： Ou Fan li yuanmei 不详

Chamdo City is situated toward the east of the Tibet Autonomous Region,in the part that seems like a neck sticking out between China's Sichuan,Qinghai,and Yunnan Provinces.This is where the twomain highways can be found connecting Sichuan and Yunnan to the region.It was also a crucial juncture of the ancient Tea-Horse Road.The average altitude of Chamdo hovers around 3,500 meters above sea level and is very well known for its abundance of zigzagging and intersecting ravines and gullies,barren lands,and a climate that at best can make human ha bitation difficult.This is why poverty has plagued the people of this place for generations,and even though efforts have been rather admirable in their gravity,helping locals has by far been no easy task due to the amount of money that had and has to be poured into related projects,the depth of poverty the people found themselves in,and the major hurdles that had to be traversed.

关键词： connecting money situated

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跨越喜马拉雅的战“疫”

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China's Tibet 2022年第2期33卷 4-13页

作者： Wu Jianying Yi Wenwen li yuanmei Huang Wenjuan(Translated) 不详

In the silent war against COVID-19,Chinese national traditional medicine (meaning all types of traditional medicine among China’s56 ethnic groups) has been playing significant and irreplaceable roles to save people’s lives.One of the major facets of these traditional practices,especially in the highland plateau region,is the traditional Tibetan medicine.

关键词： replace Tibetan plateau

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千年八廓街的保护传承与更新

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China's Tibet 2023年第1期34卷 28-33页

作者： li yuanmei Sun Jian Zhou Jing Huang Wenjuan(译) 不详

Barkor Street in Lhasa is one of the most well-known historical districts in China.Each and every corner is always brimming with countless stories to tell.The district is seated in Lhasa’s downtown,a unique,ancient,vibrant venue.That is why a group of experts consisting of Madra Sonam Drudra(the deputy secretarygeneral and one of the esteemed experts of the Chinese Ethnic Minority Architecture Association) and several other respected names in the field recently conducted a systematic research program with regard to the preservation and perseverance of the ancient district.Based on that research.

关键词：八廓街 district ancient

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