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A new ent-labdane eiterpenoid lactone from Andrographis paniculata

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chinese Chemical Letters 2009年第3期20卷 317-319页

作者： xiao chi ma Bao Jing Zhang Sha Deng Shan Shan Huang Ke Xin Liu Jing Ming Jia School of Pharmaceutical Sciences Dalian Medical University Dalian 116027 PR China School of Traditional chinese Medicines Shenyang Pharmaceutical University Shengyang 110016 China

A new ent-labdane diterpenoid lactone with a new natural product was isolated from Andrographis paniculata. Their structures were elucidated on the basis of spectral evidences including 2D NMR.

关键词： Andrographis paniculata Ent-labdane diterpenoid Acanthaceae Lactone

Finite-time Prescribed Performance Time-Varying Formation Control for Second-Order Multi-Agent Systems With Non-Strict Feedback Based on a Neural Network Observer

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IEEE/CAA Journal of Automatica Sinica 2024年第4期11卷 1039-1050页

作者： chi ma Dianbiao Dong the School of Mechanical Engineering Northwestern Polytechnical UniversityXi’an 710072China

This paper studies the problem of time-varying formation control with finite-time prescribed performance for nonstrict feedback second-order multi-agent systems with unmeasured states and unknown *** eliminate nonlinearities,neural networks are applied to approximate the inherent dynamics of the *** addition,due to the limitations of the actual working conditions,each follower agent can only obtain the locally measurable partial state information of the leader *** address this problem,a neural network state observer based on the leader state information is ***,a finite-time prescribed performance adaptive output feedback control strategy is proposed by restricting the sliding mode surface to a prescribed region,which ensures that the closed-loop system has practical finite-time stability and that formation errors of the multi-agent systems converge to the prescribed performance bound in finite ***,a numerical simulation is provided to demonstrate the practicality and effectiveness of the developed algorithm.

关键词： Finite-time control multi-agent systems neural network prescribed performance control time-varying formation control

A new ent-labdane diterpenoid lactone from Andrographis paniculata

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chinese Chemical Letters 2010年第5期21卷 587-589页

作者： xiao chi ma Zhan Ping Gou Chang Yuan Wang Ji Hong Yao Xiu Lan Xin Yuan Lin Ke Xin Liu School of Pharmacy Dalian Medical UniversityDalian 116044China School of Pharmacology Guangdong Medical CollegeDongguan 523808China Biotechnology Application Center Beijing Vocational College of Electronic Science and TechnologyBeijing 100029China

A new ent-labdane diterpenoid lactone was isolated from Andrographis *** structure was identified on the basis of spectral data including 2D NMR.

关键词： Andrographis paniculata Ent-labdane diterpenoid Lactone

Existence of long-range magnetic order in Heisenberg spin nanoribbons with edge modification

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Communications in Theoretical Physics 2024年第7期76卷 134-144页

作者： Da-cheng ma Ling-yi Cui Chu-xiao Sun xiao-dan chi Zheng-Nan XianYu An Du College of Science Northeastern UniversityShenyang 110819China Department of Basic Science Dalian Naval AcademyDalian 116018China Department of Physics College of SciencesShenyang University of Chemical TechnologyShenyang 110142China National Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern UniversityChina Key Laboratory of Data Analytics and Optimization for Smart Industry(Northeastern University) Ministry of EducationChina

Long-range magnetic order appears on a side decorated Heisenberg spin nanoribbon at nonzero temperature,although no spontaneous magnetization exists in a one-or two-dimensional isotropic Heisenberg model at any nonzero temperature according to the Mermin-Wagner *** use of the spin Green's function method,we calculated the magnetizations of Heisenberg nanoribbons decorated by side spins with single-ion anisotropy and found that the system exhibits a nonzero transition temperature,whether the decorated edge spins of the system link together or separate from each *** the width of the nanoribbon achieves infinite limit,the transition temperatures of the system tend to the same finite constant eventually whether one edge or both edges are decorated by side spins in the *** results reveal that the magnetism of a low-dimensional spin system is different from that of a threedimensional spin *** the single-ion anisotropy of edge spins in a Heisenberg spin nanoribbon can be modulated by an electric field experimentally,various useful long-range magnetic orders of the system can be *** work can provide a detailed theoretical basis for designing and fabricating next-generation low-dimensional magnetic random-access memory.

关键词： Nanoribbon magnetic anisotropy long-range magnetic order Heisenberg model transition temperature

Two new diterpene and sesquiterpene from Pteris dispar

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chinese Chemical Letters 2011年第12期22卷 1451-1453页

作者： Zhan Ping Gou Nian Ci Liang Jie Hou Li Li Yan Tian Chang Yuan Wang Xun Cui Bao Jing Zhang xiao chi ma Guangdong Key Laboratory of Research and Development of Natural Drugs Guangdong Medical CollegeZhanjiang 524023China School of Pharmacy Dalian Medical UniversityDalian 116044China Department of Oriental Pharmacy Woosuk UniversityWanju-gunJeonbuk 565-701Republic of Korea

A new diterpene and a new sesquiterpene were isolated from Pteris dispar and identified on the basis of spectral data including 2D *** 1 and 2 showed potent cytotoxic activity against KB cell.

关键词： Pteris dispar ent-Kaurane Sesquiterpenoid

Uncarialins J-M from Uncaria rhynchophylla and Their Anti-depression Mechanism in Unpredictable Chronic Mild Stress-Induced Mice via Activating 5-HT_(1A) Receptor

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chinese Journal of Chemistry 2021年第5期39卷 1331-1343页

作者： Zhen-Long Yu Rong Bai Jun-Jun Zhou Hui-Lian Huang Wen-Yu Zhao xiao-Kui Huo Ya-Hui Yang Zhi-Lin Luan Bao-Jing Zhang Cheng-Peng Sun xiao-chi ma Dalian Key Laboratory of Metabolic Target Characterization and Traditional chinese Medicine Intervention National&Local Joint Engineering Research Center for Drug Development of Neurodegenerative DiseaseCollege of PharmacyCollege(Institute)of Integrative MedicineDalian Medical UniversityDalianLiaoning 116044China Department of Pharmacy Shanghai East HospitalTongji UniversityShanghai 200120China Laboratory of Modern Preparation of Traditional chinese Medicine Ministry of EducationJiangxi University of Traditional Chinese MedicineNanchangJiangxi 330103China

Uncaria rhynchophylla has been widely used to treat central nervous system diseases for a long *** investigation of ***,eleven monoterpene indole alkaloids,including four new compounds uncarialins J-M(1-4)and seven known analogues(5-11),were isolated and *** structural characterization was conducted using HRESIMS,1D and 2D NMR,electronic circular dichroism(ECD)spectra,and quantum chemical *** 1,2,7,and 9-11 displayed significant ag-onistic effects towards 5-HT_(1A) receptor,and their EC_(50) values were 7.86,732,2.24,1.18,1.52,and 3.75μmol/L,***,in vivo experimental results fully revealed that hirsuteine(7)displayed a significant antidepression effect in unpredictable chronic mild stress(UCMS)-induced depression mice mainly via regulating 5-HT_(1A) signaling *** docking and site-directed amino acid mutation verified that amino acid residues Aspll6 and Asn386 were the binding sites of hirsuteine(7)with 5-HT_(1A) *** addition,pre-treatment of mice with WAY 100635 also blocked the anti-depression effect of hirsuteine(7),which further demonstrated that 5-HT_(1A) receptor was a potential target of hirsuteine(7)to effectively treat *** findings indicated the therapeutic material basis of *** and the anti-depression underlying mechanism of hirsuteine(7),and further provided the useful guidance for the development of hirsuteine(7)as a potential antidepressant candidate.

关键词： Monoterpene indole alkaloids Hirsuteine Depression 5-HT_(1A)receptor Site-directed amino acid mutation

Protective layer for stable lithium-metal anodes at 60 ma·h/cm^(2) and 60 ma/cm^(2) with ion channel and inductive effect

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Journal of materiomics 2024年第6期10卷 1252-1260页

作者： xiao Zhang Zhiwei Chen Jiaojiao Han Qiang Wang Jinshan Wang Juhua Luo Jianguang Xu chi Chen Wei Yao School of materials Science and Engineering Jiangsu Provincial Key Laboratory of Eco-Environmental MaterialsYancheng Institute of TechnologyYancheng 224051China School of materials and Energy Shanghai Key Laboratory of Engineering Materials Application and EvaluationShanghai Polytechnic UniversityShanghai 201209China CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Xiamen Key Laboratory of Rare Earth Photoelectric Functional materials and Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen 361021China

Contradiction between ultrafast nucleation and deposition rates of lithium(Li)crystals at high rate and heterogeneity of Li^(+)flux resulting from concentration polarization has compromised the performance of Li metal anodes especially at high areal capacity and current ***,multifunctional protective layer consisting of MoO_(3) nanobelt films(MoO_(3)-NF)is introduced on the surface of Li by a simple rolling *** strong binding energy between Li and MoO_(3) guides the homogeneous nucleation and deposition of Li,while the nanobelt networks provide effective ion channels for uniform distribution of the Li+*** of the novel multifunctional protective layer,the MoO_(3)-NF@Li anodes demonstrate a remarkable stability for 800 h with ultralow overpotential of 159 mV at extreme harsh conditions of 60 ma·h/cm^(2) and 60 ma/cm^(2).MoO_(3)-NF@Li||LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2) full-cells can run 100 cycles with a superior capacity retention of 84.2%under practical test conditions,demonstrating great potential for high output and energy-density metal batteries.

关键词： Multifunctional protective layer Ion channel Inductive effect High areal capacity Li metal anodes

Fluoro-functionalized plant biomass adsorbent:Preparation and application in extraction of trace perfluorinated compounds from environmental water samples

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Journal of Environmental Sciences 2024年第3期137卷 703-715页

作者： Xi Tan Yan Shi Chun-Feng ma Quan chi Yu-Hang Yang Wen-Xiang Zhang Hua-Ming xiao Xian Wang Key Laboratory of Analytical Chemistry of the State Ethnic Affairs Commission School of Chemistry and Materials ScienceSouth-Central Minzu UniversityWuhan 430074China School of Pharmaceutical Sciences South-Central Minzu UniversityWuhan 430074China Key Laboratory of Oilseeds Processing of Ministry of Agriculture Hubei Key Laboratory of Lipid Chemistry and NutritionOil Crops Research Institute of the Chinese Academy of Agricultural SciencesWuhan 430062China

Perfuorinated compounds(PFCs)are toxic and widely present in the environment,and therefore effective adsorbents are required to remove PFCs from environmental *** the present study,a new type of fuorinated biomass materials was synthesized via an ingenious fuorosilanization *** adsorbents were applied for the adsorption of 13typical PFCs,including perfuorocarboxylic acids(PFCAs)and perfuorosulfonic acids(PFSAs).By comparing their adsorption performance,Fluorinated cedar slag(FCS)was discovered to have the best absorption efficiency and enabled highly efficient enrichment of *** adsorption recovery of FCS with the investigated PFCs is greater than 90%under the optimal adsorption *** to the high affinity of F-F sorbent-sorbate interaction,FCS had good adsorption capacities of PFCs from aqueous solution,with the maximum adsorption capacity of 15.80 mg/g for PFOS and 10.71 mg/g for PFOA,***,the adsorption time could be achieved in a short time(8 min).Using the FCS absorbent,an innovative FCS-solid phase extraction assisted with high performance liquid chromatography-electrospray-tandem mass spectrometry(FCS-SPE-HPLC-ESI-MS/MS)method was first developed to sensitively detect PFCs in the environmental water *** intra-day and inter-day recovery rates of the 13 compounds ranged from 90.7%-104.3%,with the RSD of 2.1%-4.7%(intra-day)and 2.5%-8.5%(inter-day),*** research demonstrates the potential of the newly fuoro-functionalized plant biomass to adsorb PFCs from environmental water,with the advantages of high adsorption efficiencies,high antiinterference,easy operation and low economic cost.

关键词： Fluoro-functionalized biomass Perfuorinated compounds(PFCs) Adsorption efficiency mass spectrometry(MS) Fluorinated cedar slag(FCS)

A new method for evaluating wedges of steel plates and strips

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Journal of Iron and Steel Research International 2024年第7期31卷 1719-1735页

作者： xiao-bao ma xiao-xin ma Tao Wang Zhong-kai Ren Yu-cheng Ren College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina Ministry of Education Engineering Research Center of Advanced Metal Composite Forming Technology and Equipment Taiyuan University of TechnologyTaiyuan 030024ShanxiChina National Key Laboratory of Metal Forming Technology and Heavy Equipment Taiyuan University of TechnologyTaiyuan 030024ShanxiChina china National Heavy machinery Research Institute Co. Ltd.Xi'an 710018ShaanxiChina Faculty of Mechanical Engineering Hebei University of ArchitectureZhangjiakou 075000HebeiChina

To overcome the inaccuracy problem of the traditional wedge evaluation of steel plates and strips caused by the ran-domness of the thicknesses of two local points and improve the reliability of the wedge index,the double-centroid method for the wedge evaluation was proposed,and a model based on the centroid theory was ***,an integral model for the discrete thickness values of the cross-section profiles was *** discussion focused on the distinct characteristics of the two-point method,asymmetric method,and double-centroid method in evaluating the asymmetric distribution of *** three methods were employed to evaluate the wedge values of both the theoretical and measured cross-sections of steel plates and strips,and the accuracies of three wedge evaluation models were analyzed and *** results showed that the double-centroid method objectively reflects the degree and variation characteristics of the wedge values of the cross-sections of steel plates and strips,and this method is feasible,reliable,and outstanding.

关键词： Steel plate and strip Wedge Two-point method Double-centroid method Reliability