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Synchronization criteria for multiple memristor-based neural networks with time delay and inertial term

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Science China(Technological Sciences) 2018年第4期61卷 612-622页

作者： li Ning cao JinDe College of Mathematics and Information Science Henan University of Economics and Law School of Mathematics and Research Center for Complex Systems and Network Sciences Southeast University

This present work uses different methods to synchronize the inertial memristor systems with linear coupling. Firstly, the mathematical model of inertial memristor-based neural networks(IMNNs) with time delay is proposed, where the coupling matrix satisfies the diffusion condition, which can be symmetric or asymmetric. Secondly, by using differential inclusion method and Halanay inequality, some algebraic self-synchronization criteria are obtained. Then, via constructing effective Lyapunov functional, designing discontinuous control algorithms, some new sufficient conditions are gained to achieve synchronization of networks. Finally, two illustrative simulations are provided to show the validity of the obtained results, which cannot be contained by each other.

关键词： memristor-based neural networks(MNNs) inertial term synchronization discontinuous control

POLYMER NETWORK-POLY(ETHYLENE GLYCOL)COMPLEXES WITH SHAPE MEMORY EFFECT

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Chinese Journal of Polymer Science 2003年第1期21卷 29-33页

作者： Yi-ping cao C.W.Yip 等 InstituteofOrganicChemistry ChineseAcademyofSciencesChengdu610041China DepartmentofAppliedBiologyandChemicalTechnology hongKongPolytechnicUniversityHungHomkowloonHongKongChina

The complexes of poly(methacrylic acid-co-methyl methacrylate) network with poly(ethylene glycol) stabilized byhydrogen bonds were prepared. By introducing the poly(ethylene glycol), a large difference in storage modulus below andabove the glass transition temperature occurred and the complexes exhibited shape memory behaviors. The morphology ofcomplexes was studied by using DSC, WAXD, and DMA. The results indicate that the fixed phase of this kind of novelshape memory materials is the network, and the reversible phase is the amorphous state of PEG:PMAA complex phase. Theshape recoverability almost reaches 100%. This type of complexes can be regarded as a novel shape memory network.

关键词： Hydrogen bonded complex Shape memory effect Storage modulus ratio

Aromatic inorganic acid radical

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Science China Chemistry 2019年第12期62卷 1656-1665页

作者： Jiawen Zhou Weiya Zhu Miao Zeng Qingqing Yang ping li linfeng Lan Junbiao Peng Yuan li Fei Huang Yong cao State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and DevicesSouth China University of TechnologyGuangzhou 510640China Key Laboratory for Organic Electronics and Information Displays&Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing University of Posts&TelecommunicationsNanjing 210023China

Stable radicals are challenging to prepare due to their intrinsic high ***,three trisphenolamine radicals were readily synthesized and exhibited unexpected thermal/electrochemical stability and semiconductor *** three nitroxide radicals could be considered as a class of aromatized nitro groups or HNO3 *** closed-shell nitro-like and open-shell nitroxide resonance structure contribute to their outstanding ***,the tunable ground states,extremely low band gap and p-type charge transport properties were systematically *** importantly,the work presents the concept of aromatic inorganic acid radical(AIAR)and aggregation-induced radical(AIR)mechanism to understand the intrinsic structureproperty relationship of these *** addition,we provide a novel strategy for the design of stable and low bandgap radicals for organic electronics,magnetics,spintronics,etc.

关键词： organic electronics aromatic nitric acid radical aggregation-induced radical polycyclic aromatic hydrocarbons spintronics

Synthesis and Cleavage Activity of Artifical Minic Polypeptides

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Chinese Chemical Letters 2006年第9期17卷 1197-1200页

作者： Yong YE Xiao lian HU ping li Ming Yu NIU li Feng cao Yu Fen ZHAO Department of Chemistry Key Laboratory of Chemical Biology and Organic Chemistry Zhengzhou University Zhengzhou 450052 Key laboratory of Bioorganic Phosphorus Chemistry ＆ Chemical Biology （Ministry of Education） Department of Chemistry Tsinghua University Beijing 100084

Two artificial minic polypeptides which are synthetic analogues of natural products with DNA affinity were synthesized, and theirs cleavage activity with DNA were examined. The structures of these compounds was confir... 详细信息

关键词： DNA artificial minic polypeptide cleavage agents.

An Injectable Hydrogel with or without Drugs for Prevention of Epidural Scar Adhesion after Laminectomy in Rats

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Chinese Journal of Polymer Science 2016年第2期34卷 147-163页

作者： lin Chen Xiang-qian li Lu-ping cao Xi-lei li Jun-rong Meng 董健俞麟 Jian-dong Ding State Key Laboratory of Molecular Engineering of Polymers&Department of Macromolecular Science Fudan UniversityShanghai 200433China Department of Orthopaedic Surgery Zhongshan HospitalFudan UniversityShanghai 200032China

Epidural scarring occurs inevitably in the defect after spinal laminectomy, and thus how to prevent or reduce it becomes a challenging topic. In the present study, an injectable hydrogel and its dexamethasone （DEX）-loaded hydrogel systems were adopted to prevent epidural scarring in a postlaminectomy rat model. The hydrogel system composed of poly（D,L-lactic acid-co-glycolic acid）-poly（ethylene glycol）-poly（D,L-lactic acid-co-glycolic acid）（PLGA-PEG-PLGA） triblock copolymers was a free-flowing sol at room temperature, and spontaneously turned into a semi-solid gel at body temperature. A lumbar 3 total laminectomy was performed on Sprague Dawley （SD） rats, and the efficacy of the injectable hydrogel with or without drugs in preventing epidural scar formation was evaluated via the gross anatomical observation and histological examination at one month post-surgery. The results demonstrate that the use of hydrogel alone reduced epidural scarring significantly, whereas the efficacy of the DEX-loaded hydrogels presented an irregular dose-dependency of drug and even the inappropriate drug doses resulted in the negative results. Therefore, the present study confirms that the PLGA-PEG- PLGA hydrogel holds potential as a barrier device to decrease peridural scarring, and reveals that the sustained delivery of the steroid hormone DEX to prevent surgery-related adhesions in the laminectomy defect is complex. Moreover, our in vivo studies also remind the researchers to pay attention to the irregular dose-dependency of the hormone drugs.

关键词： Thermo-reversible hydrogel Epidural scarring Laminectomy Steroid hormone.

Theoretical Studies on Structures, Stabilities, NMR Spectra and Designing Methods of Dihedral Fullerenes of C3 Series

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Chemical Research in Chinese Universities 2014年第6期30卷 1032-1043页

作者： li ping College of Chemistry Sichuan University Chengdu 610064 P. R. China

Using bowl shaped carbon intermediates to construct dihedral fullerenes is an advisable method. Assu- ming that cap shaped C21 extends the size through building pentagons and hexagons at the U and V clefts of the brims, a series of homologous carbon intermediates was generated, in which most of the members have been unknown up to now. The joins between these homologous intermediates gave the C3 dihedral series under the restriction of C3 sym- metrical axis. The investigations point out that the stabilities of these fullerenes not only relate to the shapes of cages and the co-planarities of polygons, but also associate with the equalizations of bond lengths and the pentagonal dis- tributions. The stabilities reveal that the pentagonal distribution in cages is not negligible to the Jr delocalization, be- sides the co-planarities of hexagons and pentagons. Analyzing the possible Stone-Wales（SW） rearrangements in those fullerenes with dehydrogenated pyracyclene units（DPUs） can help us to find out the highly stable isomers. Based on the geometrical optimizations, the calculations provided the theoretical chemical shifts of unknown fullerenes and the data reconfirmed the existence of members C78 and C84. The symmetry adaptation analyses for the frontier orbitals support the formative mechanism of consecutive pentagonal and hexagonal fusions, but the simulated routes are more complicated than the pentagon road（PR） mechanism, which include not only C2 but also C3 additive reactions.

关键词： Dihedral fullerene Curvature Distortion Pentagon and hexagon Chemical shift Stone-Wales(SW) ar-rangement Density functional theory

Low complexity DOA estimation for massive UCA with single snapshot

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Journal of Systems Engineering and Electronics 2022年第1期33卷 22-27页

作者： li ping li Jianfeng ZHAO Gaofeng College of Electronic and Information Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China

In this paper, a low complexity direction of arrival(DOA) estimation method for massive uniform circular array(UCA) with single snapshot is ***, the coarse DOAs are estimated by finding the peaks from the circular convolution between a fixed coefficient vector and the received data ***, in order to refine coarse DOA estimates, we reconstruct the direction matrix based on the coarse DOA estimations and take the first order Taylor expansion with DOA estimation offsets into ***, the refined estimations are obtained by compensating the offsets, which are obtained via least squares(LS) without any complex *** addition, the refinement can be iteratively implemented to enhance the estimation *** to the offset search method, the proposed method achieves a better estimation performance while requiring lower *** simulations are presented to demonstrate the effectiveness of the proposed method.

关键词： direction of arrival(DOA)estimation massive uniform circular array Taylor expansion low complexity

Stabilization and Multiple-Responsive Recognition of Natural Base Pairs in Water by a Cationic Cage

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CCS Chemistry 2022年第9期4卷 2914-2920页

作者： lin Cheng ping Tian Qingfang li Anyang li liping cao College of Chemistry and Materials Science Northwest UniversityXi’an 710069

The hydrogen-bonded(H-bonded)base pairs,double H-bonded A•T and triple H-bonded G•C in DNA,are important units for storing,encoding,and expressing genetic *** to the interference from water,however,the formation of H-bonded base pairs from short deoxynucleotide fragments such as mono-or di-deoxynucleotide are not easily achieved in aqueous solutions.

关键词： host–guest chemistry chiral recognition adaptive chirality tetraphenylethene-based cationic cage base pair

Cooperation and Competition Strategy Analysis of Decision-Making Units Based on Efficiency Game

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Journal of Systems Science and Systems Engineering 2020年第2期29卷 235-248页

作者： li cao Zhanxin Ma Muren School of Mathematics Science Inner Mongolia UniversityHohhot 010021China College of Computer and Information Inner Mongolia Medical UniversityHohhot 010051China School of Economics and Management Inner Mongolia UniversityHohhot 010021China Key Laboratory of Rail Transit Beijing Jiaotong UniversityBeijing 100044China School of Economics and Management Inner Mongolia University of TechnologyHohhot 010110 China

Data envelopment analysis(DEA)method based on game theory effectively ranks the decisionmaking units(DMUs)by the view of cooperation or *** DEA method based on partial ordered set theory depicts the relationships among ***,these methods are unable to reveal the complex cooperation and competition relationships among *** this paper,an optimal model for DMU group game strategy is proposed based on the generalized DEA method and game *** to this model,we can effectively depict the efficiency change of ***,the effect of various game relationships on individual and the union of DMUs can be *** is of positive significance for decision makers to find partners and moderate the cooperation and competition situation of their ***,the cooperation and competition relationships of 9 express enterprises in a certain area in China are analyzed by using the method proposed in this paper.

关键词： Generalized DEA game theory cross efficiency cooperation and competition