检索结果-南通市图书馆

Excitation-dependent organic persistent luminescence

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

Science China Chemistry 2020年第4期63卷 423-425页

作者： bo zhou Dongpeng Yan Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001China

Organic persistent luminescence(OPL),which maintains obvious photoemission for a period of time after ceasing the external irradiation,has attracted wide attentions in many fields,such as biological imagings,sensors,photodynamic therapies,and molecular *** date,the long excitation-state lifetime and the high photoluminescent quantum yield under ambient conditions have been regarded as the intrinsic parameters for evaluating the OPL performance.

关键词： luminescence lifetime excitation

High density stacking faults of ■ compression twin in magnesium alloys

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2019年第10期35卷 2263-2268页

作者： bo zhou Manling Sui Beijing Key Laboratory of Microstructure and Properties of Solids Institute of Microstructure and Properties of Advanced Materials Beijing University of Technology

■ compression twins with high density stacking faults were studied at atomic scale using Cscorrection transmission electron microscopy. On one side of the ■ twin boundary, there were many steps arranged alternately with the coherent twin boundaries. Most of the steps were linked with stacking faults inside twins. Burgers vector of twinning dislocations and the mismatch strain at steps were characterized. Due to the compressive mismatch strain at steps, the high density stacking faults inside twins were formed at twin tips during twinning process. The localized strain at the steps would be related to the crack nucleation in magnesium alloys.

关键词： Magnesium Twin Stacking faults High resolution transmission electron microscopy

Organic polymers achieving smart room-temperature phosphorescence

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2019年第3期62卷 291-292页

作者： bo zhou Dongpeng Yan Beijing Key Laboratory of Energy Conversion and Storage Materials College of Chemistry Beijing Normal University

Room-temperature phosphorescence (RTP) has drawn widespread attention recently owing to the unique long-lived triplet excited states and potential applications in light-emitting diodes (LEDs)[1], optical imaging [2], photodynamic therapy [3], and information security [4]. Particularly, RTP materials can effectively utilize the triplet excitons to maximize the internal quantum yield in electroluminescent fields. However, to date, the most efficient phosphors are still limited to noble metal-containing compounds (such as iridium and platinum complexes), which have some intrinsic obstacles, such as metal scarcity and high bio-toxicity.

关键词： Room-temperature widespread Organic

Seasonal increase in nest defense,but not egg rejection,in a cuckoo host

在线全文

学校读者我要写书评

暂无评论

Avian Research 2024年第1期15卷 50-54页

作者： bo zhou Wei Liang Ministry of Education Key Laboratory for Ecology of Tropical Islands Key Laboratory of Tropical Animal and Plant Ecology of Hainan ProvinceCollege of Life SciencesHainan Normal UniversityHaikou 571158China Institute of Biological Resources Jiangxi Academy of ScienceNanchang 330096China

The interactions between avian brood parasites and their hosts provide an informative and easy-to-handle system for studying *** brood parasitism reduces the reproductive success of hosts,and thus,hosts have evolved anti-parasitic strategies,such as rejecting parasitic eggs and adopting aggressive nest defense strategies,to avoid the cost brought on by brood *** test whether host anti-parasitic strategies are adjusted with the risk of being parasitized when the breeding seasons of brood parasites and hosts are not synchronous,we conducted a field experiment assessing nest defense and egg recognition behaviors of the Isabelline Shrike(Lanius isabellinus),a host of the Common Cuckoo(Cuculus canorus).In the local area,the host Isabelline Shrike begins to breed in April,whereas the summer migratory Common Cuckoo migrates to the local area in May and begins to lay parasitic *** showed that nest defense behaviors of the Isabelline Shrike increases significantly after cuckoo arrival,showing higher aggressiveness to cuckoo dummies,with no significant difference in attack rates among cuckoo,sparrowhawk and dove dummies,but their egg rejection did not change *** results imply that Isabelline Shrikes may adjust their nest defense behavior,but not egg rejection behavior,with seasonality.

关键词： Aggression Anti-parasite strategy Egg rejection Mismatch cuckoo parasitism Nest defense

Alpha-clustering effects in heavy nuclei

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2018年第6期13卷 133-144页

作者： Zhongzhou Ren bo zhou School of Physics Science and Engineering Tongji University Shanghai 200092 China Institute for International Collaboration Hokkaido University Sapporo 060-0815 Japan

The study of cluster structures in light nuclei is extending to the heavy nuclei in these years. As for the stable N = Z nuclei, from the lighter 8Be, 12C nuclei to the heavier 20Ne and even the 40Ca and 44Ti medium nuclei, the a cluster structures have been well studied and confirmed. In heavy nuclei, due to the dominated mean field, the existence of α cluster structure is not clear as light nuclei but some clues were found for indicating the core＋ α cluster structure in some nuclei, in particular, the 208 pb＋α structure in 212Po. We review some recent progress about the theoretical and experimental explorations of the a-clustering effects in heavy nuclei. We also discuss the possible a cluster structure of heavy nuclei from the view of a decay.

关键词： α cluster structure nuclear cluster model α correlations α decay

NONLINEAR ESTIMATION METHODS FOR AUTONOMOUS TRACKED VEHICLE WITH SLIP

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 Mechanical Engineering 2007年第4期20卷 1-7页

作者： zhou bo HAN Jianda Robotics Laboratory Shenyang Institute of Automation Chinese Academy of Sciences Shenyang 110016 China Graduate School Chinese Academy of Sciences Beijing 100039 China

In order to achieve precise,robust autonomous guidance and control of a tracked vehicle,a kinematic model with longitudinal and lateral slip is established,Four different nonlinear filters are used to estimate both state vector and time-varying parameter vector of the created model *** first filter is the well-known extended Kalman *** second filter is an unscented version of the Kalman *** third one is a particle filter using the unscented Kalman filter to generate the importance proposal *** last one is a novel and guaranteed filter that uses a linear set-membership estimator and can give an ellipsoid set in which the true state *** four different approaches have different complexities,behavior and advantages that are surveyed and compared.

关键词： Tracked vehicle Nonlinear estimation Kalman filter Particle filter Set-membership filter

Stimuli-responsive organic phosphorescence through energy transfer

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2021年第4期64卷 509-510页

Organic room-temperature phosphorescence(RTP)has attracted much academic and engineering interest in the fields of bioimaging,light-emitting devices,and *** is documented that the triplet excitons for generating RTP i... 详细信息

关键词： phosphor RTP generating

Residual Closeness of Graphs with Given Parameters

在线全文

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of China 2023年第4期11卷 839-856页

作者： Mei-Qun Cheng bo zhou School of Mathematical Sciences South China Normal UniversityGuangzhou510631GuangdongChina

Robustness of the network topology is a key aspect in the design of computer networks. Residual closeness is a new graph-theoretic concept defined as a measure of network robustness due to the failure of individual vertices. We identify those graphs with maximum residual closeness among connected graphs with fixed connectivity, edge connectivity and bipartiteness, respectively.

关键词： Residual closeness Connectivity Edge connectivity Bipartiteness

Advances in enhanced oil recovery technologies for low permeability reservoirs

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

Petroleum Science 2022年第4期19卷 1622-1640页

作者： Wan-Li Kang bo-bo zhou Miras Issakhov Marabek Gabdullin Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao266580ShandongPR China School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPR China Kazakh-British Technical University Almaty050000Kazakhstan

Low permeability oil and gas resources are rich and have great potential all over the world, which has gradually become the main goal of oil and gas development. However, after traditional primary and secondary exploitation, there is still a large amount of remaining oil that has not been ***, in recent years, enhanced oil recovery(EOR) technologies for low permeability reservoirs have been greatly developed to further improve crude oil production. This study presents a comprehensive review of EOR technologies in low permeability reservoirs with an emphasis on gas flooding, surfactant flooding, nanofluid flooding and imbibition EOR technologies. In addition, two kinds of gel systems are introduced for conformance control in low permeability reservoirs with channeling problems. Finally,the technical challenges, directions and outlooks of EOR in low permeability reservoirs are addressed.

关键词： Enhanced oil recovery Low permeability reservoir Gas flooding Surfactant flooding Nanofluid flooding Imbibition Conformance control