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Responsive hyperbranched poly(formyl-1,2,3-triazole)s toward quadruple-modal information security protection

Science China Chemistry 2022年第4期65卷 771-777页

作者： Baixue Li zhen Li Kai You Anjun qin Ben Zhong Tang State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular AggregatesCenter for Aggregation Induced EmissionSouth China University of TechnologyGuangzhou 510640China Shenzhen Institute of Molecular Aggregate Science and Engineering School of Science and EngineeringThe Chinese University of Hong KongShenzhen 518172China Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006China Foshan Nanhai Guangdong Technology University CNC Equipment Cooperative Innovation Institute Foshan 528225China

Secrecy has received tremendous attention in modern information society. Innovative polymer-based fluorescent materials with multiple mode emission are quite desirable to achieve multistage data security. Herein, a series of soluble and thermally stable hyperbranched poly(formyl-1,2,3-triazole)s(hb-PFTAs) with high molecular weights were facilely prepared by catalyst-free polycycloaddition of aldehyde-activated internal triyne and diazides. Functional moieties of triphenylamine and binaphthyl could be incorporated into the polymers to offer them with unique fluorescence and circular dichroism properties, *** taking advantage of activated ethynyl and aldehyde groups on their peripheries and in the internal branch chains, the hbPFTAs can undergo efficient single-and double-stage post-functionalization. More importantly, based on the remarkable fluorescence responses to hydrazine and hydrochloric acid, the hyperbranched polymers are featured with triple-mode fluorescent patterns and have been applied in quadruple-modal information encryption and storage with enhanced security and density. Collectively, this work not only enriches the structural diversity of the existing triazole-based material library, but also provides new polymeric materials for data and information security application.

关键词： activated internal triyne hyperbranched poly(formyl-1,2,3-triazole)s post-polymerization modification multilevel information security

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Fibrous Separator with Surface Modification and Micro-Nano Fibers Lamination Enabling Fast Ion Transport for Lithium-Ion Batteries

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Chinese Journal of Polymer Science 2023年第2期41卷 222-232页

作者： Yi-Ge Zhou Li Fan He-qin Li Yu-Jia Cui Shu-Fa Yu zhen-zhen Wei Yan Zhao College of Textile and Clothing Engineering National Engineering Laboratory for Modern SilkSoochow UniversitySuzhou215123China Jiangsu Yingyang Nonwoven Machinery Co. LTD.Changshu215500China

Appropriate materials collaborated with reasonable structure can significantly increase the separator performance for lithium-ion *** this work,taking the advantages of microfibrous and nanofibrous membranes and compensating for their defects,we developed a composited separator(GOPPH)with excellent overall performance by first wetting-modifying the polyethylene terephthalate microfibers and then laminating a polyvinylidene fluoride-hexafluoropropylene nanofiber *** a combination not only offers the GOPPH separator,from the perspective of structure,with high porosity and hierarchical structure in terms of fiber diameter and pore size,but also provides satisfactory features including wettability,mechanical strength and thermal shutdown function that benefit from the selected ***,as determined by experimental and theoretical approaches,the obtained GOPPH separator exhibits considerably enhanced lithium ion transport ability with a high lithium ion transference number and transport rate,which thereby endowing the cell with superior cycling stability with a capacity retention of 93%after 200 cycles at 1 ***,considering battery safety and performance,the GOPPH fibrous membrane could be a promising separator candidate for lithium-ion batteries.

关键词： Fibrous separator Surface modification Micro-nano fiber lamination Ion transport Lithium-ion batteries

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Effect of Application of a Bacteria Inoculant and Wheat Bran on Fermentation Quality of Peanut Vine Ensiled Alone or with Corn Stover

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Journal of Integrative Agriculture 2013年第3期12卷 556-560页

作者： qin Meng-zhen SHEN Yi-xin College of Animal Science and Technology Nanjing Agricultural University

To find an effective method for ensiling peanut vine （PV）, fermentation characteristics and nutritional values of PV silage and the mixture of PV with corn stover （CS） silage in a ratio of 1 ： 1 fresh weight, prepared by adding lactic acid bacteria （LAB）, 10% wheat bran （WB） and LAB＋WB at ensiling were evaluated in 2009 and 2010. The fermentation qualities of PV silage ensiled with the LAB and WB additives were improved compared with those of the control （PV ensiled alone）. However, the pH did not decline to the critical level of 4.2, and the nutritional values of the silage were not protected against losses in the LAB and WB addition silages. Ensiling PV in mixture with CS generated optimal moisture content and buffering capacity （BC） of ensiled materials. After adding the LAB and WB additives to mixture silage, especially adding LAB＋WB, the fermentation qualities and nutritional values of the mixture silage were improved significantly （P〈0.05）, and the Flieg＇s score reached to 99. The result suggested that it is a feasible method to ensile the mixed materials of PV with CS by adding LAB and high concentration of water soluble-carbohydrate materials for providing a good fermentation quality of PV silage.

关键词： peanut vine corn stover lactic bacteria acid wheat bran straw fermentation quality

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Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

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Optoelectronics Letters 2008年第4期4卷 276-279页

作者： DONG Wu-qin JIA zhen-hong College of Information Science and Engineering Xinjiang university Urumqi 830046 China

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.

关键词：应力测量光纤传感器布里渊散射增益系数理论分析

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Picroside Ⅱ down-regulates matrix metalloproteinase-9 expression following cerebral ischemia/reperfusion injury in rats

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Neural Regeneration Research 2010年第18期5卷 1403-1407页

作者： Xiang Li Xinying Xu zhen Li Yunliang Guo qin Li Xiaodan Li zhen Zhou Department of Ultrasound Affiliated Hospital of Qingdao University Medical College Qingdao 266003 Shandong Province China Institute of Cerebrovascular Disease Qingdao University Medical College Qingdao 266003 Shandong Province China Yuhuangding Hospital Qingdao University Medical College Qingdao 266003 Shandong Province China Experimental Center of Surgery Qingdao University Medical College Qingdao 266003 Shandong Province China

Studies have shown that Picroside Ⅱ attenuates inflammatory reactions following brain ischemia through the inhibition of the TLR-4-NF-KB signal transduction pathway, and ameliorates cerebral edema through the reduction of aquaporin-4 expression. Matrix metalloproteinase-9 （MMP-9）, located downstream of the TLR-4-NF-KB signal transduction pathway, can degrade the neurovascular matrix, damage the blood-brain barrier to induce cerebral edema, and directly result in neuronal apoptosis and brain injury, Therefore, the present study further observed MMP-9 expression in the brain tissues of rats with cerebral ischemia/reperfusion injury following Picroside Ⅱ treatment. Results demonstrated that Picroside Ⅱ significantly reduced MMP-9 expression in ischemic brain tissues, as well as neuronal apoptosis and brain infarct volume, suggesting Picroside Ⅱ exhibits neuroprotection by down-regulating MMP-9 expression and inhibiting cell apoptosis.

关键词： Picroside Ⅱ cerebral ischemia/reperfusion injury apoptosis matrix metalloproteinase-9 rats neural regeneration

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Improved phenomenological nuclear charge radius formulae with kernel ridge regression

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Chinese Physics C 2022年第7期46卷 129-137页

作者： Jian-qin Ma zhen-Hua Zhang Mathematies and Physics Department orth China Electric Power UniversityBeijing 102206China

The kernel ridge regression(KRR)method with Gaussian kernel is used to improve the description of the nuclear charge radius by several phenomenological *** widely used A^(1/3)A^(1/3),N^(1/3)N^(1/3)and Z^(1/3)Z^(1/3)formulae,and their improved versions by considering the isospin dependence are adopted as *** parameters in these six formulae are refitted using the Levenberg-Marquardt method,which give better results than the previous *** radius for each nucleus is predicted with the KRR network,which is trained with the deviations between experimental and calculated nuclear charge *** each formula,the resultant root-mean-square deviations of 884 nuclei with proton number Z≥8 Z≥8 and neutron number N≥8 N≥8 can be reduced to about 0.017fm after considering the modification of the KRR *** extrapolation ability of the KRR method for the neutron-rich region is examined carefully and compared with the radial basis function *** is found that the improved nuclear charge radius formulae by KRR method can avoid the risk of overfitting and have a good extrapolation *** influence of the ridge penalty term on the extrapolation ability of the KRR method is also *** last,the nuclear charge radii of several recently observed K and Ca isotopes have been analyzed.

关键词： nuclear charge radius phenomenological formulae kernel ridge regression

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ASYMPTOTIC BEHAVIOR OF SOLUTION BRANCHES OF NONLOCAL BOUNDARY VALUE PROBLEMS

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Acta Mathematica Scientia 2020年第2期40卷 341-354页

作者： Xian XU Baoxia qin zhen WANG Department of Mathematics Jiangsu Normal UniversityXuzhou 221116China School of Mathematics Qilu Normal UniversityJinan 250013China

In this article, by employing an oscillatory condition on the nonlinear term,a result is proved for the existence of connected component of solutions set of a nonlocal boundary value problem, which bifurcates from infinity and asymptotically oscillates over an interval of parameter values. An interesting and immediate consequence of such oscillation property of the connected component is the existence of infinitely many solutions of the nonlinear problem for all parameter values in that interval.

关键词： Global solution branches Leray-Schauder degree asymptotic oscillation property

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Molecular Phylogeny of the “True Citrus Fruit Trees” Group (Aurantioideae, Rutaceae) as Inferred from Chloroplast DNA Sequence

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Agricultural Sciences in China 2011年第1期10卷 49-57页

作者： LU zhen-hua ZHOU Zhi-qin XIE Rang-jin College of Horticulture and Landscape Architecture Southwest University Chongqing 400716 P.R.China Citrus Research Institute Chinese Academy of Agricultural Sciences/Southwest University Chongqing 400712 P.R.China zhengzhou Fruit Research Institute Chinese Academy of Agricultural Sciences Zhengzhou 450009 P.R. China

The genus Citrus L. has a long controversial taxonomy history, and a well-resolved molecular phylogeny of the ＂true citrus fruit trees＂ group in the future will provide new information for advancing breeding techniques and developing better conservation strategies. In the present study, three cpDNA fragments （TrnL-TrnF, PsbH-PetB, and TrnS-TrnG） of 30 genotypes chosen from the six genera of the ＂true citrus fruit trees＂ group were analyzed. A molecular phylogenetic tree of the ＂true citrus fruit trees＂ group ＂~as reconstructed based on plastid DNA sequences. The results confirmed that the ＂true citrus fruit trees＂ group was monophyletic, and thereby the group was divided into genera as previously suggested based on morphological characters. The cpDNA data also suggested that Poncirus might be the first genus separated from the other five genera in the group. The genus Fortunella were of hybrid origin and Citrus might be as its putative paternal parent. The genera Microcitrus, Eremocitrus, and Clymenia were possibly monophyletic and their common ancestor might branch out from Citrus. Furthermore, the phylogenetic relationships within the Citrus genus were discussed.

关键词： Rutaceae Aurantioideae true citrus fruit trees group molecular phylogenetics cpDNA sequence

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First-principles Study of Electron Transport Through Oligoacenes

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Chinese Journal of Chemical Physics 2009年第1期22卷 7-12页

作者： zhen Pan Qun-xiang Li qin-wei Shi Xiao-ping Wang Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China Hefei 230026 China

The electronic transport properties of oligoacenes sandwiched between two Au（111） surfaces with serial and parrallel configurations were investigeted by using a fully self-consistent nonequilibrium Green＇s function method combined with density functional calculations. This theoretical results show that the conductivity of oligoacenes with both sandwiched configurations at low bias voltage is mainly determined by the tail of the transmission peak from the perturbed highest occupied molecular orbital. When the molecular length increases, the zero-bias voltage conductance G（0） of oligoacenes with serial configuration neither follows Magoga＇s exponential law nor displays the even-odd oscillation effect, while the G（O） of the oligoacenes sandwiched with parallel configuration monotonically increases. The reduction of energy gaps, the alignment of the Fermi level, and the spatial distribution of the perturbed molecular orbitals are used to self-consistently explore the transport mechanism through oligoacenes.

关键词： Transport property Oligoacene Zero-bias voltage conductance First-principles calculation

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Constraints on water activity at the Zhurong landing site in Utopia Planitia,Mars

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Earth and Planetary Physics 2023年第3期7卷 356-370页

作者： Chengzheng Yong ZiYao Fang CongCong Zhang JunFeng zhen LiPing qin Deep Space Exploration Laboratory/Chinese Academy of Sciences Key Laboratory of Crust-Mantle Materials and Environments University of Science and Technology of ChinaHefei 230026China Chinese Academy of Sciences Center for Excellence in Comparative Planetology Hefei 230026China Chinese Academy of Sciences Key Laboratory for Research in Galaxies and Cosmology Department of AstronomyUniversity of Science and Technology of ChinaHefei 230026China

Mineralogical evidence of water–rock interactions is a strong indicator of the presence of liquid water on ancient *** observations have found widely distributed hydrated minerals in the southern highlands,whereas such discoveries have been rare in the younger northern ***’s first Mars exploration mission successfully landed a rover(Zhurong)in southern Utopia Planitia,providing an opportunity to analyze the exposed rocks in the northern *** data from the short-wave infrared(SWIR)spectrometer and the laser-induced breakdown spectrometer(LIBS)onboard the Zhurong rover,we found evidence for the widespread presence of hydrated minerals(probably sulfates or silica)around the landing *** basaltic-like elemental compositions of the targeted samples further indicated that hydrated minerals are likely minor *** results from Zhurong suggest that active aqueous activities occurred during the overall cold and dry Amazonian era on ***,further evaluations are needed on the duration and scale of these activities.

关键词： Zhurong rover hydrated mineral water activity Amazonian

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