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Fluorescence Spectra of Model Compounds for Light-emitting Alternating Copolymers in Heterogeneous Environments

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Chinese Chemical Letters 2001年第4期12卷 369-372页

作者： Jun Lin yang Hong Zhen LIN Min ZHENG feng Lian bai Organic Solids Laboratory Center for Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100080

In this paper, the fluorescence spectra of model compounds of light-emitting alternating copolymers. M (TPA-PPV) and M (TPA-PAV) (Scheme 1) were studied and the effect of KNO3 on the interaction between model compounds and ionic micelle-watts interface was also investigated. It is found that (I) The fluorescence changes of M (TPA-PPV) are related to the state of CTAB and SDS solution. (II)Aggregated state can be formed in M (TPA-PAV) solution at low concentration of CTAB. (III) Higher concentration of KNO3 may affect the interaction between model compounds and ionic micelle-water interface.

关键词： alternating copolymer charge transfer ionic micelle-water interface salt effect cetyl-trimethylammonium bromide sodium dodecylsulfate

DroidEcho:an in-depth dissection of malicious behaviors in Android applications

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Cybersecurity 2018年第1期1卷 126-142页

作者： Guozhu Meng Ruitao feng Guangdong bai Kai Chen yang Liu SKLOIS Institute of Information EngineeringChinese Academy of SciencesBeijingChina Nanyang Technological University SingaporeSingapore Singapore Institute of Technology SingaporeSingapore School of Cyber Security University of Chinese Academy of SciencesBeijingChina

A precise representation for attacks can benefit the detection of malware in both accuracy and ***,it is still far from expectation to describe attacks precisely on the Android *** addition,new features on Android,such as communication mechanisms,introduce new challenges and difficulties for attack *** this paper,we propose abstract attack models to precisely capture the semantics of various Android attacks,which include the corresponding targets,involved behaviors as well as their execution ***,we construct a novel graph-based model called the inter-component communication graph(ICCG)to describe the internal control flows and inter-component communications of *** models take into account more communication channel with a maximized preservation of their program *** the guidance of the attack models,we propose a static searching approach to detect attacks hidden in *** reduce false positive rate,we introduce an additional dynamic confirmation step to check whether the detected attacks are false *** show that DROIDECHO can detect attacks in both benchmark and real-world applications effectively and efficiently with a precision of 89.5%.

关键词： Semantic attack model Android malware detection Inter-component communication graph Privacy leakage

Phosphorous-Based Pillar[5]arenes for Uranyl Extraction

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Chinese Journal of Chemistry 2015年第3期33卷 361-367页

作者： Bing bai Yuyu Fang Quan Gan Yuanyou yang Lihua Yuan Wen feng Institute of Nuclear Science and Technology Key Laboratory for Radiation Physics and Technology of Ministry of EducationCollege of ChemistrySichuan UniversityChengduSichuan 610064China

One phosphine oxide-based pillar[5]arene 1a and two novel phosphorous-based pillar[5]arenes 1b and 1c were synthesized for use as extractants in solvent extraction of 22UO+.The results from host-guest interactions pertinent to the extracted complexes of 1a-1c revealed a significant difference in complexation capability between 1a and 1b(or 1c)by using 1H NMR,31P NMR and FT-IR *** extraction of 22UO+in separate extraction sys-tem and in simulated nuclear industry effluent containing 12 competing ions demonstrated the superior efficiency and selectivity of 1a towards 22UO+over other cations in acidic ***-log plot analysis indicated the 1∶1 stoichiometry(ligand/metal)for the extracted complex formed between the ligand and 22UO+.

关键词： phosphorus-based pillararene solvent extraction uranium selectivity

Highly efficient solid-state luminescence of carbonized polymer dots without matrix

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Chinese Chemical Letters 2023年第6期34卷 412-416页

作者： Rui Li Junjun Liu Chunlei Xia Tanglue feng Zhicheng Zhu bai yang State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China

Development of high-performance solid state luminescent carbon-based nanomaterials remains ***,strong blue-green fluorescent carbonized polymer dots(CPDs)from o-aminobenzenethiol and thiosalicylic acid(o ABT-TSA-CPDs)with an absolute photoluminescence quantum yield(PLQY)of 76%in solid state without matrix were *** adjusting the reaction temperature and time,the PL centers were proved to be carbon core state and surface state associated to carbonyl group which was the source of strong fluorescence emission in solid *** mechanism of the unique phenomenon of enhanced emission from ethanol solution(PLQY=7%)to powder(PLQY=76%)was investigated by analyzing the chemical properties and structures of o ABT-TSA-CPDs at different temperatures and o ABT-TSACPDs/PVC composites,and was confirmed as fixation of PL centers.

关键词： Carbonized polymer dots Solid-state fluorescence Matrix-free High performance Enhanced photoluminescence quantum yield

AN EXPLICIT PSEUDO-SPECTRAL SCHEME WHIT ALMOST UNCONDITIONAL STABILITY FOR THE CAHN-HILLIARD EQUATION

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Journal of Computational Mathematics 2000年第2期18卷 165-172页

作者： bai-nian Lu Rui-feng Zhang Department of Mathematics Shaanxi Normal UniversityXi’an 710062China Department of Mathematics Kaifeng Normal CollageKaifengChina

Proposes an explicit fully discrete three-level pseudo-spectral scheme with unconditional stability for the Cahn-Hilliard equation. Equations for pseudo-spectral scheme; Analysis of linear stability of critical points.

关键词： Cahn-Hilliard equation pseudo-spectral scheme almost unconditional stability linear stability for criticlal points numerical experiments

Transcriptome profiling using RNA-seq to provide insights into foxtail millet seedling tolerance to short-term water deficit stress induced by PEG-6000

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Journal of Integrative Agriculture 2019年第11期18卷 2457-2471页

作者： XU Bing-qin GAO Xiao-li GAO Jin-feng LI Jing yang Pu feng bai-li College of Agronomy Northwest A&F University/State Key Laboratory of Crop Stress Biology for Arid Areas Ministry of Science and Technology

Foxtail millet(Setaria italica L.)with high drought resistance,is grown widely in arid and semi-arid regions of the world,and it is a new model plant for genetic and molecular *** uncover the molecular mechanisms of stress-tolerance in different genotypes of foxtail millet,physiological analyses combined with transcriptional profiling were conducted using a time-course analysis on two foxtail millet genotypes Damaomao(DM)and Hongnian(HN).The genotype DM performed better than HN under water deficiency,with more moderate relative water content(RWC)and chlorophyll *** physiological and RNA-seq investigations revealed that the two genotypes possessed high conservatism in some vital biological pathways which respond to drought stress,involving hormone synthesis,proline,and soluble sugar synthesis,and reactive oxygen species(ROS)***,some genes related to these pathways showed different expression ***,the lower malondialdehyde(MDA)content in HN than DM may be explained by the observation that HN contained more activated genes in the ascorbate-glutathione cycle using KEGG pathway ***,abscisic acid(ABA)response genes,ROS scavengers which were probably involved in signaling responses,a set of enzymes involved in proline and soluble sugar synthesis,channel protein genes,and transcription factors,encompassed the early strategy of foxtail millet response to *** findings provide a comprehensive molecular view of how different foxtail millet genotypes respond to short-term osmotic stress.

关键词： transcriptome foxtail millet osmotic stress RNA-seq gene expression

Solidification and utilization of water-based drill cuttings to prepare ceramsite proppant with low-density and high performance

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Petroleum Science 2022年第5期19卷 2314-2325页

作者： Hang yang Yun-Li Liu Guo-Liang bai Zhen feng Yi Zhang Shi-Bin Xia School of Resources and Environmental Engineering Wuhan University of TechnologyWuhan430070HubeiPR China State Key Laboratory of Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhan430072HubeiPR China

Water-based drill cuttings(WBDC)and bauxite are used as raw materials to prepare proppants with low density and high *** effects of sintering temperature,sintering period,mixture ratios of materials,doping with iron oxide,and acid modification of WBDC on the properties of proppants are *** proppant performance is evaluated according to the national standard SY/*** morphology of the proppant is analyzed using scanning electron microscopy(SEM).The crystal phase structure of the proppant is studied using X-ray diffraction(XRD).Thermal analysis of the proppant sintering process is performed using thermogravimetry(TG).Proppant Z-23 completely satisfied the SY/T5108-2014 *** study provides a new perspective for the resource utilization of water-based drill cuttings and preparation of low-density proppants.

关键词： Water-based drill cuttings Proppant Thermal analysis Solid waste

Reorganizing electronic structure of Li3V2(PO4)3 using polyanion(BO3)^3-:towards better electrochemical performances

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Rare Metals 2017年第5期36卷 397-402页

作者： Yu Li Ying bai Zhi yang Zhao-Hua Wang Shi Chen feng Wu Chuan Wu School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Collaborative Innovation Center of Electric Vehicles in Beijing Beijing 100081China

Doping modification of electrode materials is a sought-after strategy to improve their electrochemical performance in the secondary batteries field. Herein,polyanion（BO3）^3-doped Li3V2（PO4）3 cathode materials were successfully synthesized via a wet coordination method. The effects of（BO3）^3- doping content on crystal structure, morphology and electrochemical performance were explored by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, cyclic voltammetry（CV） and electrochemical impedance spectroscopy（EIS）. All the asprepared samples have the same monoclinic structure;among them, Li3V2（PO4）（2.75）（BO3）（0.15） sample has relatively uniform and optimized particle size. In addition, this sample has the highest discharge capacity and the best cycling stability, with an initial discharge capacity of 120.4mAh·g^-1, and after 30 cycles at a rate of 0.1C, the discharge capacity still remains 119.3 mAh·g^-1. It is confirmed that moderate polyanion（BO3）^3- doping can rearrange the electronic structure of the bulk Li3V2（PO4）3,lower the charge transfer resistance and further improve the electrochemical behaviors.

关键词： Lithium-ion batteries Cathode materials Li3V2(PO4)3 Polyanion doping (BO3)^3-

Schemes for Generating Different Nonlinear Schrodinger Integrable Equations and Their Some Properties

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Acta Mathematicae Applicatae Sinica 2022年第3期38卷 579-600页

作者： Yu-feng ZHANG Hai-feng WANG Na bai School of Mathematics China University of Mining and TechnologyXuzhou 221116China School of Computer Science and Technology China University of Mining and TechnologyXuzhou 221116China

In the paper,we want to derive a few of nonlinear Schrodinger equations with various formats and investigate their properties,such as symmetries,single soliton solutions,multi-soliton solutions,and so *** of all,we propose an efficient and straightforward scheme for generating nonisospectral integrable hierarchies of evolution equations for which a generalized nonisospectral integrable Schrodinger hierarchy(briefly GNISH)singles out,from which we get a derivative nonlinear Schrodinger equation,a generalized nonlocal Schrodinger integrable system and furthermore we investigate the symmetries and conserved qualities of the ***,we apply the dbar method to obtain a generalized nonlinear Schr?dinger-Maxwell-Bloch(GNLS-MB)equation and its hierarchy by introducing a generalized Zakhrov-Shabat spectral problem,whose soliton solutions and gauge transformations are obtained.

关键词： nonisospectral integrable hierarchy Schroodinger equation symmetry