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Face-to-face heterojunctions within 2D/2D porous NiCo oxyphosphide/g-C_(3)N_(4)towards efficient and stable photocatalytic H_(2)evolution

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nano Research 2023年第5期16卷 6568-6576页

作者： Genrui Zhang Xiaojing li na li Tingting Wu Lei Wang Key Laboratory of Eco-chemical Engineering Key Laboratory of Optic-electric Sensing and Analytical Chemistry of Life ScienceTaishan Scholar Advantage and Characteristic Discipline Team of Eco Chemical Process and TechnologyQingdao University of Science and TechnologyQingdao 266042China College of Chemical Engineering Qingdao University of Science and TechnologyQingdao 266042China College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdao 266042China College of Environment and Safety Engineering Qingdao University of Science and TechnologyQingdao 266042China

Constructing 2D/2D face-to-face heterojunctions is believed to be an effective strategy to enhance photocatalytic performance due to the enlarged contact interface and increased surface active ***,2D porous NiCo oxyphosphide(NiCoOP)was synthesized for the first time and coupled with graphitic carbon nitride(g-C_(3)N_(4))nanosheets to form 2D/2D heterojunctions via an in-situ phosphating *** optimal 4 wt.%2D/2D NiCoOP/g-C_(3)N_(4)(OPCN)photocatalyst achieves a hydrogen evolution rate of 1.4 mmol·h^(−1)·g^(−1),which is 33 times higher than that of pure g-C_(3)N_(4).The greatly improved photocatalytic performance of the composite photocatalysts could be attributed to the formation of interfacial surface bonding states and sufficient charge transfer channels for accelerating carrier separation and transfer and the porous structure of NiCoOP nanosheets with abundant surface active sites for promoting surface ***,the 2D/2D OPCN composite photocatalysts also exhibit superior stability during photocatalytic *** study not only designs new noble-metal-free NiCoOP/g-C_(3)N_(4)composite photocatalysts but also provides a new sight in fabricating face-to-face 2D/2D heterojunctions for their application in energy conversion areas.

关键词： 2D porous NiCo oxyphosphide(NiCoOP) graphitic carbon nitride(g-C_(3)N_(4))nanosheets 2D/2D heterojunction photocatalyst hydrogen evolution

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Fe-modified HZSM-5 catalysts for ethanol conversion into light olefins

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Journal of natural Gas Chemistry 2011年第4期20卷 423-427页

作者： Jiangyin Lu Yancong liu na li Key Laboratory of Oil and Gas Fine Chemicals of Ministry of Education Xinjiang University Urumqi 830046 Xinjiang China

A series of Fe/HZSM-5 catalysts with different iron loadings were prepared by impregnation *** was performed by N2 adsorption-desorption,X-ray diffraction（XRD）,NH3 temperature-programmed desorption（NH3-TPD）,temperature-programmed reduction （TPR）,temperature-programmed oxidation（TPO）and thermogravimetry（TG）*** content in the synthesized samples varied from 1.1 wt%to 20 wt%.The obtained samples have been used for ethanol conversion into light *** was found that the amount of strong acidity at 300 -5 50-C on Fe-modified samples was decreased,going with another new acid site appearance at 550- 600-C and that Fe/HZSM-5 catalysts were highly selective towards light olefins,especially the 9FZ *** addition,Fe-modified catalysts suppressed the conversion of ethanol to aromatics and paraffins and enhanced their anti-carbon deposit ability.

关键词： bio-ethanol light olefins HZSM-5 Fe modification

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linear-quadratic generalized Stackelberg games with jump-diffusion processes and related forward-backward stochastic differential equations

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Science China Mathematics 2021年第9期64卷 2091-2116页

作者： na li Jie Xiong Zhiyong Yu School of Statistics Shandong University of Finance and EconomicsJinan250014China Department of Mathematics and SUSTech International Center for Mathematics Southern University of Science and TechnologyShenzhen518055China School of Mathematics Shandong UniversityJinan250100China

A kind of linear-quadratic Stackelberg games with the multilevel hierarchy driven by both Brownian motion and Poisson processes is *** Stackelberg equilibrium is presented by linear forward-backward stochastic differential equations(FBSDEs)with Poisson processes(FBSDEPs)in a closed *** the continuity method,the unique solvability of FBSDEPs with a multilevel self-similar domination-monotonicity structure is obtained.

关键词： Stackelberg game forward-backward stochastic differential equation stochastic optimal control linear-quadratic problem Poisson process

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Cryo-EM Studies of Virus-Antibody Immune Complexes

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Virologica Sinica 2020年第1期35卷 1-13页

作者： na li Zhiqiang li Yan Fu Sheng Cao CAS Key Laboratory of Special Pathogens and Biosafety Wuhan Institute of VirologyWuhan 430071China Center for Biosafety Mega-Science Chinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China

Antibodies play critical roles in neutralizing viral infections and are increasingly used as therapeutic drugs and diagnostic tools. Structural studies on virus-antibody immune complexes are important for better understanding the molecular mechanisms of antibody-mediated neutralization and also provide valuable information for structure-based vaccine ***-electron microscopy(cryo-EM) has recently matured as a powerful structural technique for studying bio-macromolecular complexes. When combined with X-ray crystallography, cryo-EM provides a routine approach for structurally characterizing the immune complexes formed between icosahedral viruses and their antibodies. In this review, recent advances in the structural understanding of virus-antibody interactions are outlined for whole virions with icosahedral T = pseudo 3(picornaviruses) and T = 3(flaviviruses) architectures, focusing on the dynamic nature of viral shells in different functional states. Glycoprotein complexes from pleomorphic enveloped viruses are also discussed as immune complex antigens. Improving our understanding of viral epitope structures using virus-based platforms would provide a fundamental road map for future vaccine development.

关键词： Cryo-electron microscopy(Cryo-EM) Icosahedral Antigen Virion Immune complex

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Novel Poly(methyl methacrylate)-based Ionomers Used as Multifunctional Aids to Modify Poly(vinyl chloride)

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Chinese Journal of Polymer Science 2016年第4期34卷 483-490页

作者： li-na Zhang 宋义虎郑强 Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Zhejiang University Hangzhou 310027 China

Poly（methyl methacrylate）（PMMA） based ionomers with different lanthanum （La（III）） contents （PMMA-XLa） synthesized by free radical solution polymerization were applied to poly（vinyl chloride）（PVC） resins as a kind of multifunctional aids, and their performances were evaluated by measuring the static stability time, initial discoloration, transparency, fusion behavior and tensile strength of the modified PVC. The ionomers with proper lanthanum （La（III）） contents show a better thermal stability efficiency in comparison with traditional stabilizer lanthanum stearate. Meantime, they can accelerate PVC plasticization more efficiently than PMMA. The rigid PVC products stabilized with the ionomers present good transparency and enhanced tensile strength.

关键词： Rigid PVC Ionomers Thermal stability Plasticization Multifunction.

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In‐situ structural characterizations of electrochemical intercalation of graphite compounds

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Carbon Energy 2019年第2期1卷 200-218页

作者： na li Dong Su Beijing national Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijingChina Frontier Institute of Science and Technology jointly with College of Science Xi’an Jiaotong UniversityXi’anShaanxiChina

Graphite carbon has been successfully used for the anode materials of secondary ion batteries due to its capability of accommodating ions between graphite *** intercalation dynamics intrinsically determine the performance of the *** this review,we summarize recent research progresses of structural characterizations on graphite intercalation in electrochemical devices,especially on the in‐situ study on the intercalations of li/na/K ions,AlCl4−and other anions,or *** techniques,including X‐ray,electron microscopy,Raman,neutron scattering,nuclear magnetic resonance,and optical microscopy provide direct information of the reaction dynamics and help to understand the factors affecting the electrochemical performances of metallic ion batteries.

关键词： graphite intercalation in‐situ characterization li/na/K/Al ions batteries

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Boolean functions of an odd number of variables with maximum algebraic immunity

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Science in China(Series F) 2007年第3期50卷 307-317页

作者： li na QI WenFeng Department of Applied Mathematics Zhengzhou Information Engineering University Zhengzhou 450002China

In this paper, we study Boolean functions of an odd number of variables with maximum algebraic immunity. We identify three classes of such functions, and give some necessary conditions of such functions, which help to examine whether a Boolean function of an odd number of variables has the maximum algebraic immunity. Further, some necessary conditions for such functions to have also higher nonlinearity are proposed, and a class of these functions are also obtained. Finally, we present a sufficient and necessary condition for Boolean functions of an odd number of variables to achieve maximum algebraic immunity and to be also 1-resilient.

关键词： algebraic attacks algebraic immunity nonlinearity correlation immunity

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Double attention U-Net for brain tumor MR image segmentation

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International Journal of Intelligent Computing and Cybernetics 2021年第3期14卷 467-479页

作者： na li Kai Ren College of Computer Sciences South-Central University for NationalitiesWuhanChina

Purpose-Automatic segmentation of brain tumor from medical images is a challenging task because of tumor’s uneven and irregular *** this paper,the authors propose an attention-based nested segmentation network,named *** total,two types of attention mechanisms are introduced to make the U-Net network focus on the key feature *** proposed network has a deep supervised encoder-decoder architecture and a redesigned dense skip ***-Net introduces an attention mechanism between convolutional blocks so that the features extracted at different levels can be merged with a task-related ***/methodology/approach-In the coding layer,the authors designed a channel attention *** marks the importance of each feature graph in the segmentation *** the decoding layer,the authors designed a spatial attention *** marks the importance of different regional *** by fusing features at different scales in the same coding layer,the network can fully extract the detailed information of the original image and learn more tumor boundary ***-To verify the effectiveness of the DAU-Net,experiments were carried out on the BRATS2018 brain tumor magnetic resonance imaging(MRI)*** segmentation results show that the proposed method has a high accuracy,with a Dice similarity coefficient(DSC)of 89%in the complete tumor,which is an improvement of 8.04 and 4.02%,compared with fully convolutional network(FCN)and U-Net,***/value-The experimental results show that the proposed method has good performance in the segmentation of brain *** proposed method has potential clinical applicability.

关键词： Brain tumor segmentation U-Net model Double attention mechanism

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Simple fabrication of carboxymethyl cellulose and k-carrageenan composite aerogel with efficient performance in removal of fluoroquinolone antibiotics from water

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Frontiers of Environmental Science & Engineering 2022年第10期16卷 105-118页

作者： na li Boqiang Gao Ran Yang Hu Yang State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China Department of Environmental Science School of Tropical and Laboratory MedicineHainan Medical UniversityHaikou 571199China

3D composite aerogels(CMC-CG)composed of carboxymethyl cellulose andκ-carrageenan were designed and fabricated using the one-pot synthesis *** optimized CMC-CG showed a good mechanical property and a high swelling ratio due to its superior textural properties with a proper chemically cross-linked interpenetrating network ***-CG was utilized for the removal of various fluoroquinolones(FQs)from water and exhibited high adsorption performance because of effective electrostatic attraction and hydrogen bonding ***(CIP),a popular FQ,was used as the *** optimized CMC-CG had a theoretically maximal CIP uptake of approximately 1.271 mmol/g at the pH of *** adsorption capacity of CMC-CG was improved in the presence of some cations,Cu2+and Fe3+ions,at a low concentration through the bridging effect but was reduced at a high *** investigation of adsorption mechanisms,based on the adsorption kinetics,isotherms and thermodynamic study,Fourier transform infrared spectrometry and X-ray photoelectron spectroscopy analyses before and after adsorption,and changes in the adsorption performance of CMC-CG toward two molecular probes,further indicated that electrostatic attraction was the dominant interaction rather than hydrogen bonding in this ***-CG after saturated adsorption of CIP could be easily regenerated using a dilute naCl aqueous solution and reused ***,the disused aerogel could still be reused as a new adsorbent for effective adsorption of Cu2+***,this study suggested the promising applications of this composite aerogel as an eco-friendly,cost-effective,and recyclable adsorbent for thie efficient removal of FQs from water.

关键词： Composite aerogel of carboxymethy lcellulose andκ-carrageenan Fluoroquinolone antibiotics Adsorption performance Coexisting substances Adsorption mechanism Reusability

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Solutions of multiple vector refinement equations with infinite mask

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Applied Mathematics(A Journal of Chinese Universities) 2009年第2期24卷 209-213页

作者： li na liU Zhi-song Department of Mathematics Shandong Institute of Education Jinan 250013 China Information College Zhejiang Ocean University Zhoushan 316004 China

This paper is devoted to investigating the solutions of refinement equations of the form Ф（x）=∑α∈Z^s α（α）Ф（Mx-α）,x∈R^s,where the vector of functions Ф = （Ф1,… ,Фr）^T is in （L1（R^s））^r, α =（α（α））α∈Z^s is an infinitely supported sequence of r × r matrices called the refinement mask, and M is an s × s integer matrix such that lim n→∞ M^-n =0, with m = detM. Some properties about the solutions of refinement equations axe obtained.

关键词： refinement equation refinement mask multiple refinable function

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