检索结果-南通市图书馆

Enhanced ionic diffusion interface in hierarchical metal-organic framework@layered double hydroxide for high-performance hybrid supercapacitors

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

Nano Research 2022年第10期15卷 8983-8990页

作者： Yanan Zhang Junlei chen chenyang Su keyao chen Huabin Zhang Yuhao Yang Wenhuan Huang Key Laboratory of Chemical Additives for China National Light Industry College of Chemistry and Chemical EngineeringShaanxi University of Science and TechnologyXi’an 710021China KAUST Catalysis Center King Abdullah University of Science and TechnologyThuwal 23955-6900Kingdom of Saudi Arabia

Layered double hydroxides(LDHs)with abundant accessible active sites are promising electrode materials for hybrid supercapacitor(HSC)due to their ultrahigh theoretical ***,the structural agglomeration of LDH leads to poor rate capability and ***,we construct a diffusion-controlled interface in hierarchical architecture of metal-organic framework(MOF)HKUST-1@cobalt-nickel LDH(denoted as HKUST-1@CoNiLDH)through an in situ etching/electro-deposition *** rapid charge transfer and ionic diffusion in HKUST-1@CoNiLDH deliver a remarkable specific capacity of 297.23 mAh·g^(−1) at 1 A·g^(−1),superior to mostly reported LDH-based *** importantly,the as-prepared HKUST-1@CoNiLDH//activated carbon HSC exhibit a high energy density of 39.8 Wh·kg^(−1) at a power density of 799.9 W·kg^(−1) with an outstanding capacitance retention of 90%after 5,000 charge–discharge *** in-depth understanding of the ionic diffusion among the MOF/LDH interfaces will greatly promote the further development of designing and synthesizing high performance energy conversion and storage devices.

关键词： supercapacitor layered double hydroxides(LDHs) metal-organic framework(MOF) electrodeposition interface

Climate Services for Water Resource Management in China: The Case Study of Danjiangkou Reservoir

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

Journal of Meteorological Research 2021年第1期35卷 87-100页

作者： Yujie WANG Xiang LI Song LIU Zhenyu HAN Lianchun SONG Zongjian KE keyao chen Key Laboratory of Meteorological Disaster Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science&TechnologyNanjing 210044 School of Atmospheric Sciences Nanjing University of Information Science&TechnologyNanjing 210044 National Climate Center China Meteorological AdministrationBeijing 100081 Hanjiang Water Resources&Hydropower Group Co. Ltd.Wuhan 430000

The efficiencies and effectiveness of water resource management are inextricably linked to climate services. This study demonstrates a climate information service for Danjiangkou Reservoir, which is the largest artificial lake in Asia, facing mounting challenges for flood control, water storage, and water diversion. Unlike traditional water resource management on the basis of short-term weather forecast and runoff monitoring, subseasonal to seasonal(S2S)and annual climate predictions as well as long-term climate change projections were well used to support the decision makers in Danjiangkou Reservoir. The National Climate Center(NCC) has projected the changes of future climate and extreme events by dynamically downscaling the Coupled Model Intercomparison Project phase 5(CMIP5)projections to 25-km resolution for the long-term planning of water resource management in Danjiangkou ***-time climate predictions based on climate models and downscaling interpretation and application methods at different timescales were also provided to meet the specific needs of earlier predictions and spatial refinement for the short-term diversion of the reservoir. Our results show that such climate services facilitated the Diversion Center of Danjiangkou Reservoir(DCDR) to reasonably control the operational water level, increased the ecological water supply to the northern portion of China by 844 million m^(3), and reduced as much as 1.67 billion m^(3) of abandoned water in 2019. In the future, it is necessary to develop climate prediction methods to increase spatial and temporal resolutions and prediction skills, and enhance interactions between providers and users.

关键词： climate service water resource management climate prediction climate projection reservoir

Strategies for Improving the Brightness of Aggregation-Induced Emission Materials at Aggregate Level

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2023年第10期41卷 1249-1259页

作者： Yixiong Gui keyao chen Yan Sun Yonghong Tan Wenshuai Luo Dongxia Zhu Yu Xiong Dingyuan Yan Dong Wang Ben Zhong Tang Center for AIE Research College of Materials Science and EngineeringShenzhen UniversityShenzhenGuangdong 518060China School of Science and Engineering Shenzhen Institute of Molecular Aggregate Science and EngineeringThe Chinese University of Hong KongShenzhenGuangdong 518172China Key Laboratory of Nanobiosensing and Nanobioanalysis at Universities of Jilin Province Department of ChemistryNortheast Normal UniversityChangchunJilin 130024China

The brightness of fluorescent agents directly determines the imaging performance as *** various fluorophores,small organic species are promising given its exact purity/composition and excellent ***,chromophores with planar geometry may suffer from the undesirable aggregation-caused quenching(ACQ)***,luminogens showing aggregation-induced emission(AIE)features are preferable as the aggregates which are the most common used *** this review,we mainly focus on the strategies employed for boosting the brightness of AIE-active luminogens(AIEgens).From molecule to mor-phology levels,approaches that regulate electronic transition processes of the molecule or the packing extent of aggregates in order to confine molecular motion,reduceπ-πstacking,disrupt fluorophore-water interactions,etc.,are *** the end,the current challenges and perspectives are briefly *** anticipate that this review will stimulate new insights and more efforts for the advancement of ultrabright AIEgens.

关键词： Aggregation-induced emission Fluorescence brightness Restriction of molecular motion Radiative energy decay Electron transfer π-πstacking

Multi-dimensional multiplexing optical secret sharing framework with cascaded liquid crystal holograms

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

Opto-Electronic Advances 2024年第1期7卷 28-35页

作者： keyao Li Yiming Wang Dapu Pi Baoli Li Haitao Luan Xinyuan Fang Peng chen Yanqing Lu Min Gu Institute of Photonic Chips University of Shanghai for Science and TechnologyShanghai 200093China Centre for Artificial-Intelligence Nanophotonics School of Optical-Electrical and Computer EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China National Laboratory of Solid State Microstructures and College of Engineering and Applied SciencesNanjing UniversityNanjing 210093China

Secret sharing is a promising technology for information encryption by splitting the secret information into different ***,the traditional scheme suffers from information leakage in decryption process since the amount of available information channels is ***,we propose and demonstrate an optical secret sharing framework based on the multi-dimensional multiplexing liquid crystal(LC)*** LC holograms are used as spatially separated shares to carry secret *** polarization of the incident light and the distance between different shares are served as secret keys,which can significantly improve the information security and ***,the decryption condition is also restricted by the applied external voltage due to the variant diffraction efficiency,which further increases the information *** implementation,an artificial neural network(ANN)model is developed to carefully design the phase distribution of each LC *** the advantage of high security,high capacity and simple configuration,our optical secret sharing framework has great potentials in optical encryption and dynamic holographic display.

关键词： holographic encryption optical secret sharing cascaded liquid crystal hologram multi-dimensional multiplexing

在线全文

学校读者我要写书评

暂无评论

《红楼梦》中的西府海棠及其相关问题考辨

曹雪芹研究 2023年第4期 94-103页

作者：陈珂尧北京大学考古文博学院

《红楼梦》中,怡红院里的西府海棠见证了诸多重要事件。西府海棠名称中的“西府”指今陕西宝鸡;怡红院中所种植的海棠明确为西府海棠,属蔷薇目蔷薇科苹果属,而曾出现在秦可卿卧室、用于室内观赏的木瓜则属蔷薇科木瓜属,海棠诗社所咏的... 详细信息

《红楼梦》中,怡红院里的西府海棠见证了诸多重要事件。西府海棠名称中的“西府”指今陕西宝鸡;怡红院中所种植的海棠明确为西府海棠,属蔷薇目蔷薇科苹果属,而曾出现在秦可卿卧室、用于室内观赏的木瓜则属蔷薇科木瓜属,海棠诗社所咏的白海棠属葫芦目秋海棠科,在文本中常笼统被冠以“海棠”,容易混淆,应注意区分。西府海棠有“违时开放”的特性,“海棠花妖”的情节反映出后四十回对前八十回“兆应”写作手法的“部分追随”;西府海棠也属于皇家园林的一部分,反映了一定的地域文化特征。

关键词：红楼梦西府海棠花期海棠花妖地域文化

社区居民对会展业经济影响感知研究--以广州琶洲村村民为例

在线全文

学校读者我要写书评

暂无评论

热带地理 2012年第2期32卷 113-120,127页

作者：罗秋菊陈可耀黄霞中山大学旅游学院广州510275 中山大学旅游发展与规划研究中心广州510275

广交会及广州琶洲会展中心已成为广州会展业的代表符号,广州琶洲村毗邻琶洲会展中心,是会展业促进城市化发展的典型城中村。本文以琶洲村村民为例,通过社区居民感知内容、感知结构及感知特征3个维度解析城市大力倡导发展的会展业对社区... 详细信息

广交会及广州琶洲会展中心已成为广州会展业的代表符号,广州琶洲村毗邻琶洲会展中心,是会展业促进城市化发展的典型城中村。本文以琶洲村村民为例,通过社区居民感知内容、感知结构及感知特征3个维度解析城市大力倡导发展的会展业对社区经济的影响。其区别于以往研究之处有二:一是把视角放在产生持续效应的会展中心和大型展会对周边社区的经济影响上,而非偶发性的体育事件和节庆活动;二是运用定性的方法重点挖掘社区居民的经济影响感知,而非运用追求普适性的定量方法。研究结果显示:社区经济对会展业的依赖性增强,主要表征在影响居民的收入来源、就业方式以及获取房屋及店铺的租金上;居民对于会展业的发展总体持乐观及支持态度,积极性感知弱化了会展所带来的其他消极性感知;村民不满足现有的外部交换关系,热切希望引入中高端的外来消费者参与到他们的经济交换之中。

关键词：会展业经济影响社区居民感知琶洲村

在线全文

学校读者我要写书评

暂无评论

基于MAR的工程制图助学系统研究

图学学报 2018年第3期39卷 587-593页

作者：侯守明连盼盼徐文鹏陈柯瑶河南理工大学计算机科学与技术学院河南焦作454100 鹤壁汽车工程职业学院河南鹤壁458030

在工程制图课程中根据二维图纸来构思三维形状,对于初学者来说有相当大的难度。针对传统基于PC端工程制图的多媒体辅助教学方式在交互性和易用性上的不足,研究基于移动增强现实的工程制图助学系统。采用无标记识别技术实现工程图样与三... 详细信息

在工程制图课程中根据二维图纸来构思三维形状,对于初学者来说有相当大的难度。针对传统基于PC端工程制图的多媒体辅助教学方式在交互性和易用性上的不足,研究基于移动增强现实的工程制图助学系统。采用无标记识别技术实现工程图样与三维数字化模型的自然交互,并在此基础上开发了一个功能齐全的助学APP,使用者可以通过手机摄像头扫描识别二维工程图,在屏幕上叠加显示三维模型以及其他相关教学资源,用户可实时完成模型缩放、旋转等操作,并且可对复杂的工程装配体模型进行拆卸和组装。实验结果表明,该系统不仅便于学生自主学习,而且在一定程度上改善了工程制图课程的教学环境。

关键词：增强现实工程制图无标记识别助学系统

在线全文

学校读者我要写书评

暂无评论

气候变化知识传播之思考

气候变化研究进展 2016年第2期12卷 162-166页

作者：王玉洁陈克垚周波涛李威朱飚甘肃省气象局西北区域气候中心兰州730020 南京大学大气科学学院南京210046 中国气象局国家气候中心北京100081

本文试图从经典的大众传播学基本理论和模式入手,梳理现有气候变化知识产品的编制方式、主要传播途径和相关实践经验,以期为未来气候变化信息传播研究和实践提供参考。分析表明:气候变化知识传播过程应遵循信息传播的基本规律,并充分考... 详细信息

本文试图从经典的大众传播学基本理论和模式入手,梳理现有气候变化知识产品的编制方式、主要传播途径和相关实践经验,以期为未来气候变化信息传播研究和实践提供参考。分析表明:气候变化知识传播过程应遵循信息传播的基本规律,并充分考虑气候变化知识自身所具有的复杂性和交叉性特点;在信息采集方面,应注重知识的科学性、系统性、准确性和权威性;在展示方式方面,应注重内容的可读性、趣味性、精练性和通俗性;在传播途径方面,除传统的大众媒介外,还需要注重利用新兴的互联网、社交媒体等平台,发挥人际关系网络作用;在国家经济社会发展的新形势下,需要进一步加强气候变化知识传播的理论、模式和实践等方面的创新性研究。

关键词：气候变化知识传播实践

冠状动脉定量血流分数与心脏磁共振评估冠心病患者心肌缺血的一致性研究

在线全文

学校读者我要写书评

暂无评论

中国医师杂志 2024年第1期26卷 18-24页

作者：惠可尧赵蕾张臣张洪博齐疏影高海马晓海首都医科大学附属北京安贞医院介入诊疗科北京100029 首都医科大学附属北京安贞医院医学影像科北京100029 首都医科大学附属北京安贞医院冠心病中心急诊冠脉病区北京100029

目的评价冠状动脉定量血流分数(QFR)和心脏磁共振(CMR)评估冠心病(CAD)患者心肌缺血的相关性和一致性。方法回顾性分析2017年8月至2022年3月在首都医科大学附属北京安贞医院行负荷CMR检查和冠状动脉造影的冠心病患者资料。CMR检查包括... 详细信息

目的评价冠状动脉定量血流分数(QFR)和心脏磁共振(CMR)评估冠心病(CAD)患者心肌缺血的相关性和一致性。方法回顾性分析2017年8月至2022年3月在首都医科大学附属北京安贞医院行负荷CMR检查和冠状动脉造影的冠心病患者资料。CMR检查包括心脏电影、负荷/静息心肌灌注成像和延迟增强序列。根据CMR检查结果将患者左室心肌节段分为正常节段组、异常节段组(进一步分为缺血节段组和梗死节段组)。在冠状动脉造影基础上,应用基于人工智能基础的平台(AngioPlus系统)计算患者经皮冠状动脉介入治疗术前冠状动脉QFR值。采用Kappa检验分析评价QFR和CMR诊断异常心肌的一致性;采用Mann-Whitney U检验比较组间QFR差异;采用受试者工作特征(ROC)曲线评价QFR诊断异常心肌的效能;采用Spearman相关分析明确患者心肌梗死面积与供血冠状动脉QFR值之间的关系。结果入组70例CAD患者中,男60例、女10例,年龄(54.1±11.1)岁。在血管水平,QFR和CMR诊断心肌损伤(含缺血和梗死)的一致性中等(Kappa值=0.514),检出CAD患者异常心肌节段的灵敏度为57%,特异度为91%,QFR预测CAD患者异常心肌的AUC值为0.769,最佳截断值为QFR=0.865,此时QFR预测CAD患者心肌损伤的灵敏度为67.2%,特异度为84.3%。正常节段组、缺血节段组和梗死节段组的血管QFR比较差异有统计学意义(P<0.001),其中梗死节段组QFR值明显低于其他两组(均P<0.01)。心肌梗死范围与供血冠状动脉QFR值呈负相关(r=-0.45,P<0.001)。在患者水平,QFR和CMR诊断心肌损伤(含缺血和梗死)的一致性中等(Kappa值=0.445),诊断CAD患者心肌损伤的灵敏度为74%,特异度为81%。结论与CMR比较,QFR检出CAD患者心肌损伤具有较好的特异度。梗死节段组QFR值明显低于缺血组和正常组。心肌梗死面积与供血冠状动脉QFR值呈负相关。

关键词：心脏成像技术磁共振成像定量血流分数冠心病心肌缺血