分布式光伏(distributed photovoltaic,DPV)的大规模无序接入为山区配电网带来了过电压、功率倒送等问题,影响配电网的稳定运行。如何准确计算山区配电网DPV承载能力已成为目前亟待研究和解决的重要问题。针对这一问题,以山区配电网所...分布式光伏(distributed photovoltaic,DPV)的大规模无序接入为山区配电网带来了过电压、功率倒送等问题,影响配电网的稳定运行。如何准确计算山区配电网DPV承载能力已成为目前亟待研究和解决的重要问题。针对这一问题,以山区配电网所能接入的DPV最大容量为目标函数,构建考虑储能系统(energy storage system,ESS)容量健康退化和含有ESS的智能软开关(soft open point integrated with energy storage,E-SOP)的确定性模型。其次,分析DPV出力曲线,并在确定性模型的基础上构建山区柔性配电网DPV承载能力双层鲁棒模型。然后,根据KKT条件将模型转化为混合整数线性规划问题,并采用Gurobi求解器求得模型评估结果。最后,通过改进的IEEE33节点山区柔性配电网进行算例分析,研究ESS容量健康退化和DPV出力不确定性对DPV承载能力的影响。算例分析表明所提模型使DPV承载能力提高了8.43%,验证了该模型的可行性和有效性。展开更多
Interactions among ecosystem services(ESs)are spatially heterogeneous,shaped by both stable(unidirectional)and unstable(context-dependent)influences of socio-economic development and climate change.These complexities ...Interactions among ecosystem services(ESs)are spatially heterogeneous,shaped by both stable(unidirectional)and unstable(context-dependent)influences of socio-economic development and climate change.These complexities pose significant challenges for spatially adaptive ecosystem management.Ecosystem service bundles(ESBs),as recurring combinations of ESs,offer a valuable framework to capture such interactions.Here,we proposed an integrated analytical framework that combines K-means clustering,the geographical detector(GD)model,and geographically and temporally weighted regression(GTWR)models to evaluate how socio-economic and climatic drivers influence ESBs across space and time.Using Hanshui River Basin(HRB)in central China as a case study,we quantified ES dynamics from 2000 to 2020,identified ESBs and stable and unstable effects of multiple drivers.The results showed that carbon sequestration(CS),water yield(WY),and aesthetic landscape(AL)increased by 32.80%,9.00%,and 7.34%,respectively,while soil retention(SR)and food supply(FS)declined by 8.38%and 5.36%.Five distinct ESBs were identified,namely ecologically fragile bundle(EFB),agricultural production bundle(APB),water supply bundle(WSB),forest ecological bundle(FEB),and ecological conservation bundle(ECB).Among these,FEB expanded to more than 35.75%of the HRB,and APB exhibited the sharpest decline(-28.64%).Land use intensity(LUI)was the primary driver of the spatial heterogeneity of ESBs,while synergistic and nonlinear interactions among multiple factors increasingly amplified their effects over time.Notably,annual precipitation(AP)emerged as the only stable basin-scale driver,consistently enhancing ES performance,while gross domestic product(GDP)and normalized difference vegetation index(NDVI)had stable yet spatially differentiated effects across bundles.Our findings highlight the significance of distinguishing stable/unstable driver effects on ES dynamics to inform regionally adaptive ecosystem governance.The proposed framework provides valuable insights into ES interactions,identify spatial priorities,and support policy interventions that balance ecological conservation with socio-economic development.展开更多
药物疹伴嗜酸性粒细胞增多和系统症状（drug reaction with eosinophilia and systemic symptoms，DRESS），又称药物超敏反应综合征（drug hypersensitivity syndrom，DIHS）是一种具有特异症候的重症药疹，致死率大约为10％。2006年2...药物疹伴嗜酸性粒细胞增多和系统症状（drug reaction with eosinophilia and systemic symptoms，DRESS），又称药物超敏反应综合征（drug hypersensitivity syndrom，DIHS）是一种具有特异症候的重症药疹，致死率大约为10％。2006年2月15日，我科收治了1例DRESS综合征的患者，经过精心的治疗及护理，患者于住院13d后病情好转出院，现报道如下。展开更多
Spatio-temporal semantics based on ＂object views＂ or ＂event views＂ has few abilities to represent and model the continuity and gradual oceanic phenomena or objects, which seriously limits the specific marine appli...Spatio-temporal semantics based on ＂object views＂ or ＂event views＂ has few abilities to represent and model the continuity and gradual oceanic phenomena or objects, which seriously limits the specific marine applications and knowledge discovery and data mining, so this paper proposes a hierarchical abstraction semantics with ＂marine spatio-temporal process-life span phases-evolution sequences--state units＂ and process objects included by level with ＂marine process objects--phase objects--sequence object---state objects＂ with the oceanic process characteristics into the marine process semantics. In addition, this paper designs the storage and representation of marine process objects using the backus normal forms （BNF） and abstract data type （ADT）. Base on E1 Nifio Southern Oscilation （ENSO） index and Chinese rain gauging station data, this paper also gives a case of study. The spatio-temporal analysis between ENSO process and Chinese rainfall anomalies shows that the marine spatio-temporal semantics not only can illustrate the spatial distribution of Chinese rainfall anomalies in different time scales at ENSO process, life span phases and state units, but also analyze the dynamic changes of Chinese rainfall anomalies in different life span phases or state units within ENSO evolution.展开更多
文摘分布式光伏(distributed photovoltaic,DPV)的大规模无序接入为山区配电网带来了过电压、功率倒送等问题,影响配电网的稳定运行。如何准确计算山区配电网DPV承载能力已成为目前亟待研究和解决的重要问题。针对这一问题,以山区配电网所能接入的DPV最大容量为目标函数,构建考虑储能系统(energy storage system,ESS)容量健康退化和含有ESS的智能软开关(soft open point integrated with energy storage,E-SOP)的确定性模型。其次,分析DPV出力曲线,并在确定性模型的基础上构建山区柔性配电网DPV承载能力双层鲁棒模型。然后,根据KKT条件将模型转化为混合整数线性规划问题,并采用Gurobi求解器求得模型评估结果。最后,通过改进的IEEE33节点山区柔性配电网进行算例分析,研究ESS容量健康退化和DPV出力不确定性对DPV承载能力的影响。算例分析表明所提模型使DPV承载能力提高了8.43%,验证了该模型的可行性和有效性。
基金Under the auspices of National Natural Science Foundation of China(No.42171414)。
文摘Interactions among ecosystem services(ESs)are spatially heterogeneous,shaped by both stable(unidirectional)and unstable(context-dependent)influences of socio-economic development and climate change.These complexities pose significant challenges for spatially adaptive ecosystem management.Ecosystem service bundles(ESBs),as recurring combinations of ESs,offer a valuable framework to capture such interactions.Here,we proposed an integrated analytical framework that combines K-means clustering,the geographical detector(GD)model,and geographically and temporally weighted regression(GTWR)models to evaluate how socio-economic and climatic drivers influence ESBs across space and time.Using Hanshui River Basin(HRB)in central China as a case study,we quantified ES dynamics from 2000 to 2020,identified ESBs and stable and unstable effects of multiple drivers.The results showed that carbon sequestration(CS),water yield(WY),and aesthetic landscape(AL)increased by 32.80%,9.00%,and 7.34%,respectively,while soil retention(SR)and food supply(FS)declined by 8.38%and 5.36%.Five distinct ESBs were identified,namely ecologically fragile bundle(EFB),agricultural production bundle(APB),water supply bundle(WSB),forest ecological bundle(FEB),and ecological conservation bundle(ECB).Among these,FEB expanded to more than 35.75%of the HRB,and APB exhibited the sharpest decline(-28.64%).Land use intensity(LUI)was the primary driver of the spatial heterogeneity of ESBs,while synergistic and nonlinear interactions among multiple factors increasingly amplified their effects over time.Notably,annual precipitation(AP)emerged as the only stable basin-scale driver,consistently enhancing ES performance,while gross domestic product(GDP)and normalized difference vegetation index(NDVI)had stable yet spatially differentiated effects across bundles.Our findings highlight the significance of distinguishing stable/unstable driver effects on ES dynamics to inform regionally adaptive ecosystem governance.The proposed framework provides valuable insights into ES interactions,identify spatial priorities,and support policy interventions that balance ecological conservation with socio-economic development.
文摘药物疹伴嗜酸性粒细胞增多和系统症状（drug reaction with eosinophilia and systemic symptoms，DRESS），又称药物超敏反应综合征（drug hypersensitivity syndrom，DIHS）是一种具有特异症候的重症药疹，致死率大约为10％。2006年2月15日，我科收治了1例DRESS综合征的患者，经过精心的治疗及护理，患者于住院13d后病情好转出院，现报道如下。
基金The National Basic Research Program of China under contract No.2009CB723903the National Natural Science Foundation of China under contract Nos 40901194 and 40801162+2 种基金the Director Foundation of CEODECASunder contract No.Y2ZZ06101B
文摘Spatio-temporal semantics based on ＂object views＂ or ＂event views＂ has few abilities to represent and model the continuity and gradual oceanic phenomena or objects, which seriously limits the specific marine applications and knowledge discovery and data mining, so this paper proposes a hierarchical abstraction semantics with ＂marine spatio-temporal process-life span phases-evolution sequences--state units＂ and process objects included by level with ＂marine process objects--phase objects--sequence object---state objects＂ with the oceanic process characteristics into the marine process semantics. In addition, this paper designs the storage and representation of marine process objects using the backus normal forms （BNF） and abstract data type （ADT）. Base on E1 Nifio Southern Oscilation （ENSO） index and Chinese rain gauging station data, this paper also gives a case of study. The spatio-temporal analysis between ENSO process and Chinese rainfall anomalies shows that the marine spatio-temporal semantics not only can illustrate the spatial distribution of Chinese rainfall anomalies in different time scales at ENSO process, life span phases and state units, but also analyze the dynamic changes of Chinese rainfall anomalies in different life span phases or state units within ENSO evolution.
