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四苯乙烯酰胺类化合物的合成及其高灵敏度、高选择性识别Cu2+

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有机化学 2024年第8期44卷 2581-2587页

作者：苏小龙李健鹏刘孟鑫邹莉杨得锁冯海涛宝鸡文理学院化学化工学院聚集诱导发光研究中心

设计合成了一种四苯乙烯基酰胺类荧光探针TPE-Py,并对其结构进行了表征.通过荧光发射光谱和He La细胞成像实验研究了其金属离子识别性能.结果表明:探针TPE-Py对Cu2+具有较好的选择性和灵敏性,在H2O/THF （V∶V=9∶1）溶液中对Cu2+显示... 详细信息

设计合成了一种四苯乙烯基酰胺类荧光探针TPE-Py,并对其结构进行了表征.通过荧光发射光谱和He La细胞成像实验研究了其金属离子识别性能.结果表明:探针TPE-Py对Cu2+具有较好的选择性和灵敏性,在H2O/THF （V∶V=9∶1）溶液中对Cu2+显示出荧光淬灭效应,且不受其他金属离子干扰.细胞成像实验表明,探针TPE-Py可以检测细胞脂滴中的Cu2+.

关键词：聚集诱导发光荧光探针离子识别细胞成像

On Ad-Nilpotent b-Ideals for Orthogonal lie Algebras

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Acta Mathematica Sinica,English Series 2013年第2期29卷 241-262页

作者： li li liu li LUO Department of Mathematics East China Normal University

Krattenthaler, Orsina and Papi provided explicit formulas for the number of ad-nilpotent ideals with fixed class of nilpotence of a Borel subalgebra of a classical lie algebra. Especially for types A and C they obtained refined results about these ideals with not only fixed class of nilpotence hut also fixed dimension. In this paper, we shall follow their algorithm to determine the enumeration of ad-nilpotent b-ideals with fixed class of nilpotence and dimension for orthogonal lie algebras, i.e., types B and D.

关键词： Orthogonal lie algebra Borel subalgebra ad-nilpotent ideal

A Critical study on Fire-induced Aerodynamics of Balcony Spill Plumes

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Journal of Thermal Science 2008年第3期17卷 281-287页

作者： Junmei li Yanfeng li Yun liu Suduo Xue The college of Architecture and Civil Engineering Beijing University of Technology Beijing 100124 China

Balcony spill plume is one of the main plume forms in an atrium fire, its thermal behavior which is important to the designers for the smoke control system design is still not well understood now. The fire-induced aerodynamics of balcony spill plume would be studied by the numerical method in this paper. Some uncertainties relating to the available calculation methods for the smoke production rate would be reexamined. Numerical results indicated that using an entrainment coefficient 0.11 would be better than 0.16 in describing the entrainment behavior, end effect should not be ignored for the plume being not two-dimensional （2-D）. Suitable empirical spill plume equations would be recommended for the smoke management system design.

关键词： balcony spill plume atrium fire numerical method smoke management

Energy investigations on the mechanical properties of magnesium alloyed by X = C, B, N, O and vacancy

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Frontiers of Materials Science 2013年第4期7卷 405-412页

作者： Xiao-Zhi WU li-li liu Rui WANG li-Yong GAN Qing liu National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing 400044 China College of Materials Science and Engineering Chongqing University Chongqing 400044 China College of Physics and Institute for Structure and Function Chongqing University Chongqing 401331 China Physical Sciences and Engineering Division KAUST 23955-6900 Saudi Arabia

The generalized stacking fault （GSF） energies and surface energies of magnesium and its alloys with alloying atoms X- C, B, N, O and vacancy have been investigated using the first-principles methods. It is found that the predominant reducing effects of the alloying atoms and vacancy on the stacking fault energy are resulted from the position of them in the 1st layer near the slip plane. The stacking fault energies are nearly the same as the pure magnesium while the alloying atoms and vacancy are placed in the 2nd, 3rd, 4th, 5th and 6th layers. It has been shown that O strongly reduces the GSF energy of Mg. The alloying atoms C, B and N increase the surface energy, but O and vacancy reduce the surface energy of Mg. The ductilities of Mg and Mg alloys have been discussed based on the Rice criterion by using the ratio between surface energy and unstable stacking fault energy.

关键词： magnesium stacking fault energy surface energy Rice criterion

SNMS: an intelligent transportation system network architecture based on WSN and P2P network

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The Journal of China Universities of Posts and Telecommunications 2007年第1期14卷 65-70页

作者： li li liu Yuan-an TANG Bi-hua Wireless Center Beijing University of posts and TelecommunicationsBeijing 100876 China

With the development of city road networks, the question of how to obtain information about the roads is becoming more and more important. In this article, sensor network with mobile station （SNMS）, a novel two-tiered intelligent transportation system （ITS） network architecture based on wireless sensor network （WSN） and peer-to-peer （P2P） network, is proposed to provide significant traffic information about the road and thereby, assist travelers to take optimum decisions when they are driving. A detailed explanation with regard to the strategy of each level as well as the design of two main components in the network, sensor unit （SU） and mobile station （MS）, is presented. Finally, a representative scenario is described to display the operation of the system.

关键词： SNMS WSN P2E SU MS

ZrCl_4/Hantzsch 1,4-dihydropyridine as a new and efficient reagent combination for the direct reductive amination of aldehydes and ketones with weakly basic amines

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Chinese Chemical Letters 2007年第4期18卷 458-460页

作者： Zhen Gang liu Nan li li Yang Zhong li liu Wei Yu State Key Laboratory of Applied Organic Chemistry Lanzhou University Lanzhou 730000 China

ZrCl4/Hantzsch 1,4-dihydropyridine is a mild and highly efficient reagent combination for the direct reductive amination. Weakly basic amines such as anilines substituted by electron-withdrawing group and heteroaromatic amines can be reductively alkylated with electron rich aldehydes and ketones under mild conditions to form the secondary amines in excellent yields.

关键词： Zirconium tetractfloride Hantzsch 1,4-dihydropyfidine Reductive amination

Catalyst-free Multicomponent Synthesis of β-Mercapto Diketones in Water

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Chinese Journal of Chemistry 2011年第9期29卷 1856-1862页

作者： li, li liu, Bokai WU, Qi lin, Xianfu Department of Chemistry Zhejiang University Hangzhou Zhejiang 310027 China

A simple, efficient and eco-friendly route has been developed for the synthesis of fl-mercapto diketones via a multicomponent reaction of an aldehyde, acetylacetone and thiol in water. This methodology affords a numbe... 详细信息

关键词： catalyst-free multicomponent reaction β-mercapto diketone water chemistry thiol

Dynamical Behavior of SEIR-SVS Epidemic Models with Nonlinear Incidence and Vaccination

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Acta Mathematicae Applicatae Sinica 2022年第2期38卷 282-303页

作者： Xiao-mei FENG li-li liu Feng-qin ZHANG School of Mathematics and Informational Technology Yuncheng UniversityYuncheng 044000China School of Mathematics and Informational Sciences Shaanxi Normal UniversityXi'an 710062China Complex Systems Research Center Shanxi UniversityTaiyuan 030006China Shanxi Key Laboratory of Mathematical Techniques and Big Data Analysis on Disease Control and Prevention Shanxi UniversityTaiyuan 030006China

For some infectious diseases such as mumps,HBV,there is evidence showing that vaccinated individuals always lose their immunity at different rates depending on the inoculation *** this paper,we propose an age-structured epidemic model using a step function to describe the rate at which vaccinated individuals lose immunity and reduce the age-structured epidemic model to the delay differential *** the age-structured model,we consider the positivity,boundedness,and compactness of the semiflow and study global stability of equilibria by constructing appropriate Lyapunov ***,for the reduced delay differential equation model,we study the existence of the endemic equilibrium and prove the global stability of ***,some numerical simulations are provided to support our theoretical results and a brief discussion is given.

关键词： vaccination age-structured epidemic model delay differential equation model stability Lyapunov functional

A novel and facile one-pot sulfonyloxylactonization of alkenoic acids

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Chinese Chemical Letters 2009年第12期20卷 1427-1430页

作者： Min Zhu li li Cai Qin liu College of Biological and Environmental Sciences Zhejiang Shuren University Hangzhou 310015 China

The novel and facile one-pot method for sulfonyloxylactonization of alkenoic acids was reported： when （diacetoxyiodo）- benzene, various 4-pentenoic acids or 5-hexenoic acid and sulfonic acids were mixed in CH2Cl2 at room temperature, sulfonyloxylactons were obtained in good to excellent yields in short times, some had two diastereoisomers.

关键词： Sulfonyloxylactonization (Diacetoxyiodo)benzene Alkenoic acid Synthesis