检索结果-南通市图书馆

An artificial neural network approach to estimate evapotranspiration from remote sensing and AmeriFlux data

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2013年第1期7卷 103-111页

作者： Zhuoqi CHEN Runhe SHI shupeng zhang College of Global Change and Earth System Science Beijing Normal University Beijing 100875 China Key Laboratory of Geographic Information Science East China Normal University Shanghai 200062 China

A simple and accurate method to estimate evapotranspiration （ET） is essential for dynamic monitor- ing of the Earth system at a large scale. In this paper, we developed an artificial neural network （ANN） model forced by remote sensing and AmeriFlux data to estimate ET. First, the ANN was trained with ET measurements made at 13 AmeriFlux sites and land surface products derived from satellite remotely sensed data （normalized difference vegetation index, land surface temperature and surface net radiation） for the period 2002-2006. ET estimated with the ANN was then validated by ET observed at five AmeriFlux sites during the same period. The validation sites covered five different vegetation types and were not involved in the ANN training. The coefficient of determination （RE） value for comparison between estimated and measured ET was 0.77, the root-mean- square error was 0.62 mm/d, and the mean residual was - 0.28. The simple model developed in this paper captured the seasonal and interannual variation features of ET on the whole. However, the accuracy of estimated ET depended on the vegetation types, among which estimated ET showed the best result for deciduous broadleaf forest compared to the other four vegetation types.

关键词： AmeriFlux artificial neural network （ANN）,evapotranspiration （ET） remote sensing

Satisfactory surgical outcome of T2 gastric cancer after modified D2 lymphadenectomy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Cancer Research 2017年第2期29卷 100-108页

作者： shupeng zhang Liangliang WU Xiaona Wang Xuewei Ding Han Liang Department of General Surgery the Fifth Central Hospital of Tianjin Tianjin 300450 China Department of Gastric Cancer Tianjin Medical University Cancer Institute & Hospital National Clinical Research Center of Cancer Key Laboratory of Cancer Prevention and Therapy Tianjin's Clinical Research Center for Cancer Tianjin 300060 China

Objective： Though D2 lymphadenectomy has been increasingly regarded as standard surgical procedure for advanced gastric cancer （GC）, the modified D2 （D 1＋7, 8a and 9） lymphadenectomy may be more suitable than D2 dissection for T2 stage GC. The purpose of this study is to elucidate whether the surgical outcome of modified D2 lymphadenectomy was comparable to that of standard D2 dissection in T2 stage GC patients. Methods： A retrospective cohort study with 77 cases and 77 controls matched for baseline characteristics was conducted. Patients were categorized into two groups according to the extent of lymphadenectomy： the modified D2 group （roD2） and the standard D2 group （D2）. Surgical outcome and recurrence date were compared between the two groups. Results： The 5-year overall survival （OS） rate was 71.4% for patients accepted mD2 lymphadenectomy and 70.1% for those accepted standard D2, respectively, and the difference was not statistically significant. Multivariate survival analysis revealed that curability, tumor size, TNM stage and postoperative complications were independently prognostic factors for T2 stage GC patients. Patients in the mD2 group tended to have less intraoperative blood loss （P=0.001） and shorter operation time （P〈0.001） than those in the D2 group. While there were no significant differences in recurrence rate and types, especially lymph node recurrence, between the two groups. Conclusions： The surgical outcome of mD2 lymphadenectomy was equal to that of standard D2, and the use of mD2 instead of standard D2 can be a better option for T2 stage GC.

关键词： Gastric carcinoma T2 modified D2 lymphadenectomy prognosis complication

Plant drought tolerance trait is the key parameter in improving the modeling of terrestrial transpiration in arid and semi-arid regions

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2022年第1期15卷 35-41页

作者： Xintao Liu Xingjie Lu Shulei zhang Zhongwang Wei Nan Wei shupeng zhang Hua Yuan Wei Shangguan Shaofeng Liu Jianfeng Huang Lu Li Xiulan Ye Jinxuan Zhou Wenke Hu Yongjiu Dai Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Guangdong Province Key Laboratory for Climate Change and Natural Disaster StudiesSchool of Atmospheric SciencesSun Yat‐sen UniversityGuangzhouChina

陆面过程蒸腾作用的模拟制约着天气,气候降水预测的精确度.近几十年来,为了更好地描述植被蒸腾的水力约束,陆面过程模式发展了基于植物性状的植物水力胁迫方案.然而,我们对于植物性状在蒸腾模拟中的地位仍然缺乏了解,植物性状对蒸腾的... 详细信息

陆面过程蒸腾作用的模拟制约着天气,气候降水预测的精确度.近几十年来,为了更好地描述植被蒸腾的水力约束,陆面过程模式发展了基于植物性状的植物水力胁迫方案.然而,我们对于植物性状在蒸腾模拟中的地位仍然缺乏了解,植物性状对蒸腾的重要性仍需进一步量化.本研究利用Morris方法评估植物性状参数在通用陆面模式植物水力胁迫方案(CoLM-P_(50)HS)中的重要性,针对17种植物性状,筛选出最为重要的:耐旱性状(P_(50)),气孔性状,和光合作用性状.在12个FLUXNET站点中,参数的重要性由归一化敏感度来衡量.P_(50)的重要性随着降水的减少而增加,而气孔性状和光合作用性状的重要性则随着降水的减少而减少.在干旱或半干旱地区,P_(50)比气孔性状和光合作用性状更重要,这意味着当植物经常经历干旱时,水力安全策略比植物生长策略更关键.而耐旱性状的巨大变异性进一步暗示了多种植物水力安全策略的共存.忽视P_(50)的变异性可能会对陆面过程模式蒸腾作用的模拟造成严重误差.因此,为了更好地表示植物水力功能的变异性,需要增加对耐旱性状的观测并耦合到陆面模式中.

关键词：蒸腾陆面过程模式敏感性分析植物水力胁迫方案植物性状

设计赋能创造价值——“手工艺50人论坛”2023世界峰会众家谈(三)

在线全文

学校读者我要写书评

暂无评论

雕塑 2024年第2期 12-19页

作者：张书鹏(整理) 不详

“手工艺50人论坛”2023世界峰会于2023年10月27日—28日,在温州市空港万豪酒店举行。来自世界六大洲的手工艺界大咖,齐聚盛会、开坛论道、碰撞思想,奉献智库观点、发表学术洞见、达成理论共识。从“瓷”“漆”“石”传统物质材料说起白... 详细信息

“手工艺50人论坛”2023世界峰会于2023年10月27日—28日,在温州市空港万豪酒店举行。来自世界六大洲的手工艺界大咖,齐聚盛会、开坛论道、碰撞思想,奉献智库观点、发表学术洞见、达成理论共识。从“瓷”“漆”“石”传统物质材料说起白明(清华大学美术学院陶瓷艺术设计系主任)。

关键词：清华大学美术学院陶瓷艺术设计手工艺万豪酒店理论共识论坛温州市

当代手造世界表现——“手工艺50人论坛”2023世界峰会众家谈(二)

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

雕塑 2024年第1期 4-11页

作者：张书鹏(整理) 不详

“手工艺50人论坛”2023世界峰会于2023年10月27日至28日,在温州市空港万豪酒店举行。来自世界六大洲的手工艺界大咖,共襄盛会,开坛论道,碰撞思想,奉献智库观点,发表学术洞见,达成理论共识。

关键词：手工艺万豪酒店论坛理论共识温州市

在线全文

学校读者我要写书评

暂无评论

中国工艺美术学会五届五次理事会成功举行

雕塑 2024年第3期 4-7页

作者：张书鹏(文/图/整理) 不详

2024年4月20-22日,中国工艺美术学会五届五次理事会暨五届八次常务理事会(扩大)会议在山东济南隆重召开。本刊择选部分代表会议演讲文稿,以飨读者。

关键词：工艺美术学会常务理事会山东济南五次

Assessment of global meteorological,hydrological and agricultural drought under future warming based on CMIP6

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2022年第1期15卷 49-55页

作者： Jianxin Zeng Jiaxian Li Xingjie Lu Zhongwang Wei Wei Shangguan shupeng zhang Yongjiu Dai Shulei zhang Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Guangdong Province Key Laboratory for Climate Change and Natural Disaster StudiesSchool of Atmospheric SciencesSun Yat-sen UniversityGuangzhouChina

在全球变暖背景下,分析和预测干旱的变化趋势和传播规律对于区域生态环境安全和灾害管理具有重要意义.本文基于第六次国际耦合模式比较计划(CMIP6),分析了SSP2-4.5和SSP5-8.5两种变暖情景下的气象(标准化降水指数SPI和标准化降水蒸发指... 详细信息

在全球变暖背景下,分析和预测干旱的变化趋势和传播规律对于区域生态环境安全和灾害管理具有重要意义.本文基于第六次国际耦合模式比较计划(CMIP6),分析了SSP2-4.5和SSP5-8.5两种变暖情景下的气象(标准化降水指数SPI和标准化降水蒸发指数SPEI),水文(标准化径流指数SRI)和农业(标准化土壤水分指数SSI)干旱情况.从1901年到2100年,全球范围内不同类型的干旱事件普遍都表现出空间范围,持续时间和严重程度上的增长,其中SPEI干旱的增长最为显著.干旱加剧的地区主要包括美国西南部,亚马逊地区,地中海地区,非洲南部,亚洲南部和澳大利亚.尽管结果显示SRI和SSI干旱程度强于SPI干旱,但不同模式对SPI干旱的预测具有更高的一致性.此外,研究发现气象干旱与水文干旱的相关性高于气象干旱与农业干旱的相关性,在温暖湿润地区尤为明显,同时水文干旱与短时间尺度的气象干旱具有更好的相关性.本文的研究结果将有助于气候变化下的干旱监测和水资源管理.

关键词：气候变化气象干旱水文干旱农业干旱干旱传播国际耦合模式比较计划

Optimizing photosynthetic and respiratory parameters based on the seasonal variation pattern in regional net ecosystem productivity obtained from atmospheric inversion

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2015年第34期60卷 1954-1961页

作者： Zhuoqi Chen Jing M.Chen Xiaogu Zheng Fei Jiang Jun Qin shupeng zhang Wenping Yuan Weiming Ju Gang Mo College of Global Change and Earth System Science Beijing Normal University International Institute for Earth System Science Nanjing University Department of Geography and Program in Planning University of Toronto Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau ResearchChinese Academy of Sciences

In this study, we explore the feasibility of optimizing ecosystem photosynthetic and respiratory parameters from the seasonal variation of the net carbon flux. An optimization scheme is proposed to estimate two key parameters(Vmax25and Q10) by exploiting the seasonal variation in the net ecosystem carbon flux retrieved by an atmospheric inversion system. This scheme is implemented to estimate Vmax25 and Q10of the boreal ecosystem productivity simulator(BEPS) to improve its NEP simulation in the boreal North American region. Then, in situ NEE observations at six eddy covariance sites are used to evaluate the NEE simulations from BEPS with initial and optimized parameters. The results show that the performance of the optimized BEPS is superior to that of the BEPS with the default parameter values. These results implicate that it is possible to optimize ecosystem model parameters by different sensitivities of Vmax25 and Q10during growing and non-growing seasons through atmospheric inversion or data assimilation techniques.

关键词：净生态系统生产力模式优化季节变化呼吸参数反演大气光合 BEPS

在线全文

学校读者我要写书评

暂无评论

电容去离子脱盐装置构型的研究进展

化学通报 2024年第3期87卷 282-289页

作者：周田恬赖倩韩春晓王长彬李云李洪祥宋海欧张树鹏杨绍贵南京师范大学环境学院南京210023 南京理工大学化学与化工学院南京210094

电容去离子(CDI)技术是一种新型的海水淡化技术,因其具有环境友好、操作简单和能耗低等优势而受到广大研究者的关注。在CDI技术中,电吸附的性能与装置的构型有着密切的联系。本文综述了目前常见的几种CDI装置,包括膜电容去离子(MCDI)、... 详细信息

电容去离子(CDI)技术是一种新型的海水淡化技术,因其具有环境友好、操作简单和能耗低等优势而受到广大研究者的关注。在CDI技术中,电吸附的性能与装置的构型有着密切的联系。本文综述了目前常见的几种CDI装置,包括膜电容去离子(MCDI)、流动电极电容去离子(FCDI)、杂化电极电容去离子(HCDI)、反式电极电容去离子(i-CDI)以及脱盐电池(DB),对这几种装置的发展历程和装置构型进行介绍,最后,对CDI的装置构型在未来的研究发展方向进行了展望,以期为CDI装置在电脱盐领域的研究和应用提供参考。

关键词：电容去离子装置构型脱盐