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Magnesium matrix composite reinforced by nanoparticles-A review

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Journal of Magnesium and Alloys 2021年第1期9卷 57-77页

作者： K.b.nie X.J.Wang K.K.Deng X.s.Hu K.Wu state Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China College of Materials science and engineering Taiyuan University of TechnologyTaiyuan 030024China

significant progress has been made in magnesium-based composites during recent decades,especially for the appearance of magnesium matrix composite reinforced by *** nanoparticles added not only exhibit a good strengthening effect,but also maintain the initial toughness of the matrix,effectively balancing the contradiction between the strength and plasticity in the traditional magnesium matrix *** magnesium matrix nanocomposites with excellent mechanical properties have pushed the development of magnesium matrix composites to a new ***,it is very difficult to disperse the nanoparticles in metal melt especially in magnesium melt which is different from other metal melts and dangerous during the cast *** means that the preparation of magnesium matrix nanocomposite is extremely ***,the magnesium matrix nanocomposites possess a distinctive characteristic in deformation behavior,strengthening and toughening mechanism due to their special size effect of ***,this review will focus on the new preparation technologies,deformation behavior,mechanical properties and strengthening and toughening *** potential applications,development trends and future research ideas of magnesium matrix nanocomposite are also prospected.©2020 Published by elsevier *** behalf of Chongqing University.

关键词： Magnesium matrix nanocomposite Microstructure Mechanical properties strengthening mechanism

The schwarzian Derivative of Harmonic Mappings in the Plane

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Chinese Annals of Mathematics,series b 2020年第2期41卷 193-208页

作者： Liping nie Zongxin YANG Institute of Mathematics and Informatics Jiangxi Normal UniversityNanchang 330022China

In this paper, the authors introduce a definition of the schwarzian derivative of any locally univalent harmonic mapping defined on a simply connected domain in the complex plane. Using the new definition, the authors prove that any harmonic mapping f which maps the unit disk onto a convex domain has schwarzian norm ||sf||≤ 6. Furthermore, any locally univalent harmonic mapping f which maps the unit disk onto an arbitrary regular n-gon has schwarzian norm||sf||≤8/3.

关键词： schwarzian derivative schwarzian norm Harmonic mapping

Nanotechnology-based combinational strategies toward the regulation of myofibroblasts and diseased microenvironment in liver fibrosis and hepatic carcinoma

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Nano Research 2023年第12期16卷 13042-13055页

作者： Fenfen Li Ying Zhao Guangjun nie school of Pharmaceutical sciences Zhengzhou UniversityZhengzhou 450001China CAs Center for excellence in Nanoscience National Center for Nanoscience and TechnologyBeijing 101408China Center of Materials science and Optoelectronics engineering University of Chinese Academy of SciencesBeijing 100049China GbA National Institute for Nanotechnology Innovation Guangzhou 510530China

Liver fibrosis and hepatic carcinoma(HCC)pose a huge challenge worldwide due to the lack of effective treatment options for end-stage liver *** to their functions and roles,hepatic myofibroblasts mainly include nontumoral fibroblasts(mainly activated hepatic stellate cells(HsCs)),which are involved in the wound-healing process of liver fibrosis,and cancer-associated fibroblasts(CAFs)in hepatic *** play a significant role in regulating extracellular matrix(eCM)deposition in progressive liver *** can be derived from activated HsCs and differentiate into eCM-producing ***,growing evidence shows that CAFs are the primary regulators of the HCC microenvironment,releasing growth factors and cytokines and suppressing the antitumor immune *** therapeutic strategies show reduced drug resistance and side ***-based combined strategies aim to improve the delivery efficiency of various therapeutic agents with reduced toxicity via multiple *** this review,we will discuss recent developments in combinational strategies based on nanotechnology that regulate myofibroblasts and the diseased microenvironment for liver fibrosis and HCC *** will also identify the major challenges that the field is facing and offer some insights for future drug discovery.

关键词： fibroblasts liver fibrosis hepatic carcinoma nanotechnology

Highly sensitive tuning of lattice thermal conductivity of graphenelike borophene by fluorination and chlorination

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Nano Research 2020年第4期13卷 1171-1177页

作者： Tingwei Li Ge nie Qiang sun Department of Materials science and engineering Peking UniversityBeijing 100871China state Key Laboratory of Coal-based Low Carbon energy ENN Science&Development Co.Ltd.Langfang 065001China Center for Applied Physics and Technology Peking UniversityBeijing 100871China

boron-based 2D materials are of current ***,graphene-like geometry is unstable for b due to the electron deficiency,which can be stabilized by introducing H,F and ***,using density functional theory combined with phonon boltzmann transport equation,we perform systematic studies on how the functionalization changes the lattice thermal conductivity(LTC).We find that when going from hydrogenation to fluorination and chlorination,the LTC along zigzag direction changes from 367.6 to 211.3 and 43.0 W/(rrvK),while the corresponding values in armchair direction are 279.6,198.9,and 41.6 W/(m·K),*** huge differences imply the sensitivity of LTC to functionalization,which can be attributed to the enhanced anharmonicity as revealed by analyzing group velocity,Gruneisen parameter,anharmonic scattering rates,and three-phonon scattering space.

关键词： graphene-like borophene lattice thermal conductivity fluorination chlorination calculation

Regular submanifolds in Conformal space Q_p^n

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Chinese Annals of Mathematics,series b 2012年第5期33卷 695-714页

作者： Changxiong nie Chuanxi WU Faculty of Mathematics and Computer sciences -Hubei University Wuhan 430062 China. E-maih chxnie~*** Institute of Mathematics sciences Hubei University Wuhan 430062 China. E-maih cxwu@***

The authors study the regular submanifolds in the conformal space Qp^n and introduce the submanifold theory in the conformal space Qp^n. The first variation formula of the Willmore volume functional of pseudo-Riemannian submanifolds in the conformal space Qp^n is given. Finally, the conformal isotropic submanifolds in the conformal space

关键词： Conformal space Conformal invariants Willmore submanifolds Conformal isotropic

Recent advances in small-scale hydrogel-based robots for adaptive biomedical applications

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Nano Research 2024年第2期17卷 649-662页

作者： Mingzhe nie Qilong Zhao Xuemin Du Institute of biomedical&Health engineering Shenzhen Institute of Advanced Technology(SIAT)Chinese Academy of Sciences(CAS)Shenzhen 518055China

small-scale robots,ranging in size from micrometers to centimeters,have gained significant attention in the biomedical ***,conventional small-scale robots made of rigid materials encounter challenges in adapting themselves to the soft tissues and complicated environments of human *** to the rigid counterpart,small-scale hydrogel-based robots hold great promises due to their tissue-like low modulus,outstanding biocompatibility and accessible stimuli-responsive *** attributes offer small-scale hydrogel-based robots with multimodal locomotion and reinforced functions,further enhancing the adaptability in manipulation and tasks execution for various biomedical *** this review,we present recent advances in small-scale hydrogel-based *** first summarize the design principles of small-scale hydrogel-based robots including materials,fabrication techniques and manipulation strategies,then highlighting their upgraded functions and adaptive biomedical ***,we discuss existing challenges and future perspectives for small-scale hydrogel-based robots.

关键词： small-scale robot hydrogel locomotion multi-function adaptability

COUPLING DIsTINCT AND CONTINUOUs MeDIUM MODeL FOR FLOW ANALYsIs IN A FRACTUReD ROCK MAss AND ITs APPLICATION

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Journal of Hydrodynamics 1998年第2期10卷 94-104页

作者： Wang, Hongtao nie, Yongfeng Tsinghua Univ Beijing China

Method for analyzing a three-dimensional ground water flow in fractured rock mass was presented, in which flow in dominant fracture system was described by a distinct medium model, while flow in network fracture system plus rock matrices was described by a continuous medium model. Two models were coupled by using hydraulic head and flux. The method can be applied to a large sized domain. In addition, a method by using network geometry data to calculate its equivalent porous permeability was also discussed. The results of a theoretical calculation show that the coupled method can effectively analyze ground water flow in fractured rock mass.

关键词： Fracture Mathematical models Mechanical permeability Porous materials Rocks

Lateral stiffness of steel plate shear walls

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science China(Technological sciences) 2014年第1期57卷 151-162页

作者： nie JianGuo ZHU Li Department of Civil engineering Tsinghua University

The steel plate shear wall system has been used in a number of buildings as an innovative lateral force resistant *** often exist in the steel plate shear walls due to the various functional requirements of *** openings may negatively impact the lateral stiffness of steel plate shear ***,an experimental research was instituted to investigate the seismic behavior of steel plate shear walls,with and without *** experimental results showed that steel plate shear walls have the satisfying seismic behavior,and,as expected,the strength and stiffness characteristics of the walls were reduced due to *** a single-story wall panel Fe model and an analytical deep beam model are developed in order to find the critical factors dominating the thickness reduction coefficient of wall panels with the ***,extensive parametric analysis is conducted to derive a simplified formula for the determination of the thickness reduction coefficient of wall panels with the opening for substituting solid wall panels with reduced thickness for actual wall panels with the ***,the design method for calculating the lateral stiffness is verified by some experimental programs and recommended for the routine practice of steel plate shear walls.

关键词： steel plate shear walls wall panels with the opening thickness reduction coefficient lateral stiffness design method analytical deep beam model

sPATIALLY-LOCALIZeD sCAFFOLD PROTeINs MAY FACILITATe TO TRANsMIT LONG-RANGe sIGNALs

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Acta Mathematica scientia 2009年第6期29卷 1657-1669页

作者： Xinfeng Liu Qing nie Department of Mathematics University of South Carolina Columbia SC 29208 USA Department of Mathematics Center for Mathematical and Computational Biology University of California Irvine CA 92697 USA

scaffold proteins play an important role in the promotion of signal transmission and specificity during cell signaling. In cells, signaling proteins that make up a pathway are often physically orgnaized into complexes by scaffold proteins [1]. Previous work [2] has shown that spatial localization of scaffold can enhance signaling locally while simultaneously suppressing signaling at a distance, and the membrane confinement of scaffold proteins may result in a precipitous spatial gradient of the active product protein, high close to the membrane and low within the cell. However, cell-fate decisions critically depend on the temporal pattern of product protein close to the nucleus. In this paper, when phosphorylation signals cannot be transfered by diffusion only, two mechanisms have been proposed for long-range signaling within cells： multiple locations of scaffold proteins and dynamical move.e.t of scaffold proteins. Thus, here we have unveiled how the spatial propagation of the phosphorylated product protein within a cell depends on the spatially and temporal localized scaffold proteins. A class of novel and fast numerical methods for solving stiff reaction diffusion equations with complex domains is briefly introduced.

关键词： scaffold proteins signal pathway reaction-diffusion equations