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| 1 | Micro and nanolattice fabrication using projection micro litho stereo exposure additive manufacturing techniques and synchrotron X-ray 3D imaging-based defect characterization显示文摘Synchrotron radiation X-ray micro-computed tomography(SR-μCT)is a 3D imaging technique that is widely employed for the characterization of defects in advanced materials and structures.In this study,we characterize several typical defects in octettruss and re-entrant 3D lattice structures by using SR-μCT.The 3D micro-lattice structures are manufactured using projection micro litho stereo exposure(PμLSE)additive manufacturing technology.The as-fabricated 3D lattice samples are characterized using optical microscopy,and subsequently,by SR-μCT.Further more,a statistical analysis is performed to characterize the surface roughness and internal defects qualitatively,whereby the statistical geometrical parameters of struts along different directions and strut joints are analyzed and classified.Consequently,several typical defects are identified:(1)holes at the joints of the strut and irregular diameter deviations of the strut in the octet-truss lattice structure;(2)irregular diameter variations,bulges,dislocations,grooves,accumulations,and torsion in the re-entrant lattice structure.All of these defects are related to the building direction,the weight of the structure,bubbles,dust,and impurities during the PμLSE additive manufacturing process. | HU WenXia LIU LiWu WU WenWang XI Li LENG JinSong FANG DaiNing | 2020 | Science China(Technological Sciences)2020，63，4： | 2 |
| 2 | The soybean Dof‐type transcription factor genes, GmDof4 and GmDof11, enhance lipid content in the seeds of transgenic Arabidopsis plants显示文摘 | Hui‐WenWang BoZhang Yu‐JunHao JianHuang Ai‐GuoTian YongLiao | 2007 | The Plant Journal2007，，4： | 2 |
| 3 | Experiment and simulation of coiled nanofiber deposition behavior from near-field electrospinning显示文摘 | ZHENG Gaofeng LI Wenwang WANG Xiang | 2010 | Nano/Micro Engineered and Molecular Systems2010，，5： | 1 |
| 4 | Mechanical design and energy absorption of 3D novel hybrid lattice metamaterials显示文摘In this paper,three-dimensional(3D)novel hybrid lattice structures with exceptional mechanical properties and energy absorbing performances were proposed,and experimental and finite element simulation comparisons were performed to demonstrate their potential in mechanical application.First,different types of basic cubic unit cells were designed for constructing three types of novel hybrid metamaterials,in which stepped circulation of different unit cells was conceived to generate architected metamaterials.Afterwards,quasi-static compression experiments and finite element simulations were performed to study the deformation process and failure mechanisms of as-fabricated hybrid metamaterials.The energy absorption efficiency,specific energy absorption(SEA)indicators,and energy absorption capabilities of different hybrid lattice metamaterials were compared and analyzed.The results show that the deformation mechanisms of novel hybrid lattice were beneficial for generating remarkable elevated densification strain,and the energy absorption efficiency can be tailored by altering the types or sizes of basic unit cells.Strain-hardening and bilinear features were also obtained. | ZHANG Peng Biligetu QI DeXing XUE Rui LIU Kai HUANG ZhiXin WU WenWang LI Ying | 2021 | Science China(Technological Sciences)2021，64，10： | 1 |
| 5 | Effects of macrophytes and external carbon sources on nitrate removal from groundwater in constructed wetlands显示文摘 | Ying FengLin Shuh RenJing Tze WenWang | 2002 | Environmental Pollution2002，119，： | 1 |
| 6 | Damage evolution of PμLSE additive-manufactured micro-lattice metastructures: Synchrotron radiation 3D tomography image-based analysis显示文摘The manufacturing of additives with projection micro litho stereo exposure(PμLSE)has provided an opportunity for the fabrication of metastructures with complex microstructures at micro-nano resolutions.However,the performance evaluation of as-fabricated metastructures is challenging.The benefit of synchrotron radiation-based 3 D imaging techniques and advanced image processing methods makes it is feasible to study fabrication defects and damage processes of micro-nanoscale bodycentered cubic(BCC)lattices manufactured with PμLSE.First,synchrotron radiation technology is used to capture the structural features inside the micro-lattice samples.Subsequently,several types of statistical defects-based image finite element models are adopted to analyze the failure process of the structure under compression loading.Finally,comparisons between in situ experiments and numerical simulation results are performed for verification.The method of the combined non-destructive testing of synchrotron radiation and image finite element technology provides a robust technique for evaluating the performances of additive-manufactured micro-lattice with complex microstructures. | QingLiang Zeng WenWang Wu WenXia Hu Li Xi Ran Tao DaiNing Fang | 2020 | Science China(Physics,Mechanics & Astronomy)2020，63，10： | 1 |
| 7 | Microtensile tests of mechanical properties of nanoporous Au thin films显示文摘 | Re Xia Caixia Xu Wenwang Wu Xide Li Xi-Qiao Feng Yi Ding | 2009 | Journal of Materials Science2009，，17： | 1 |
| 8 | MAGNETIC PROPERTIES OF Nd_2(Fe_(1-x)M_x)_(14)B(M=C,Si)ALLOYS显示文摘The magnetic properties of Nd2(Fe1-xMx)14B(M=C and Si) compounds have been investi-gated.Substituting Fe by small amount of metalloid C and Si atoms,the compounds are intetragonal structure and have uniaxial anisotropy.The substitution of C for part of Fe de-creases the Curie temperature of the compounds and the intrinsic coercivity of bond samples atlow temperature.The replacement of Fe by Si makes the Curie temperature increase with amaximum at the vicinity of x=0.15.When the range of the content of Si is 0≤x≤0.10,thecoercivity distinctly increases at room temperature.from 62.7 kA/m at x=0 to138.7kA/m at x=0.06,where the residual magnetization has a maximum:in the mean timethe saturation magnetization decreases only by a small amount. | XING Feng JIANG Chao HE Wenwang Department of Physics,Peking University,Beijing,China | 1989 | Acta Metallurgica Sinica(English Letters)1989，2，8： | 0 |
| 9 | Efficient model for the elastic load of film-substrate system involving imperfect interface effects显示文摘In this paper,an efficient calculation method based on discrete Fourier transformation is developed for evaluating elastic load induced elastic deformation fields of film-substrate system.Making use of 2 D discrete Fourier transformation,the elastic fields induced by Hertz load is harvested in frequency domain,and the displacement and stress fields across the interface are enforced to satisfy the elasticity conditions for each Fourier modes.Given arbitrary distributed stress field at free surface plane of the three types of film-substrate systems,unique resultant elastic field within the can be harvested.Hertz load of half space,elastic film on elastic substrate,elastic film on rigid substrate system and elastic film-substrate system with three types of imperfect interface models are investigated:(1)the spring-like imperfect interface model which can be described as:u^fk|zf=-h-u^sk|z^s=0=KTσKZ and u^fz|zf=-h-u^sz|z^s=0=KNσZZ;(2)the dislocation-like interface model,where interface displacement and stress components relation can be described as:u^fi|zf=0=k^uiju^si|z^s=0 andσ^fiz|z^f=0=σ^siz|zf=0=σ^siz|z^s=0;(3)the force-like interface model,where interface displacement and stress components relation can be described as:u^fi|z^f=0=u^si|z^s=0 andσ^fiz|z^f=0=k^tijσ^siz|z^s=0 respectively.Finally,several simulation examples are performed for verification of the reliability and efficiency of the proposed semi-analytical methods. | Wenwang Wu Huabin Yu Rui Xue Tian Zhao Ran Tao Haitao Liao Zhongdong Ji | 2020 | Theoretical & Applied Mechanics Letters2020，10，6： | 0 |
| 10 | Magnetic Properties in the Pseudoternary SmFeMnC Alloys显示文摘The intrinsic magnetic properties of the tetragonal Sm_(14)Fe_(78-x)C_(8) system are investigated.In addition to the sudden drop of σ_(s) and T_(c), an ajiomalous variation of the lattice constants is found.The sign of K_(1) changes from negative to positive between x=15 and 20 at 1.5 Kf thus the cone-type anisotropy becomes uniaxial correspondingly.The intrinsic magnetic hardness effect at low temperature is observed at high Mn content. | XING Feng WANG Yingchun SUN Ling HE Wenwang | 1992 | Chinese Physics Letters1992，9，1： | 0 |
| 11 | Auxetic mechanical metamaterials: from soft to stiff显示文摘Auxetic mechanical metamaterials are artificially architected materials that possess negative Poisson’s ratio,demonstrating transversal contracting deformation under external vertical compression loading.Their physical properties are mainly determined by spatial topological configurations.Traditionally,classical auxetic mechanical metamaterials exhibit relatively lower mechanical stiffness,compared to classic stretching dominated architectures.Nevertheless,in recent years,several novel auxetic mechanical metamaterials with high stiffness have been designed and proposed for energy absorption,load-bearing,and thermal-mechanical coupling applications.In this paper,mechanical design methods for designing auxetic structures with soft and stiff mechanical behavior are summarized and classified.For soft auxetic mechanical metamaterials,classic methods,such as using soft basic material,hierarchical design,tensile braided design,and curved ribs,are proposed.In comparison,for stiff auxetic mechanical metamaterials,design schemes,such as hard base material,hierarchical design,composite design,and adding additional load-bearing ribs,are proposed.Multi-functional applications of soft and stiff auxetic mechanical metamaterials are then reviewed.We hope this study could provide some guidelines for designing programmed auxetics with specified mechanical stiffness and deformation abilities according to demand. | Xiang Li Weitao Peng Wenwang Wu Jian Xiong Yang Lu | 2023 | International Journal of Extreme Manufacturing2023，5，4： | 0 |
| 12 | Mechanics and Wave Propagation Characterization of Chiral S-Shaped Auxetic Metastructure显示文摘Auxetic metastructures have attracted tremendous attention because of their robust multifunctional properties and promising potential industrial applications.This paper studies the in-plane mechanical behaviors of a chiral S-shaped metastructure subjected to tensile loading in both X-direction and Y-direction and wave propagation properties using the finite element(FE)method.The relationships between structural parameters and elastic behaviors are also discussed.The results indicate that the orientation of chiral S-shaped metastructure under tensile loading in the X-direction exhibits higher auxeticity and stiffness.Then,the band structures and the edge modes of each band gap of the chiral S-shaped metastructure are explored,and the relations between band gap properties and structural parameters are also systematically analyzed.Moreover,we explore the wave mitigation of the chiral S-shaped metastructures by regulating the structural parameters.Finally,the transmission properties of the finite chiral S-shaped periodic metastructures are studied to confirm the results of band gap simulation.This study promotes the engineering application of vibration isolation of chiral structures based on the band gap theory. | Qingsong Zhang Wenjie Hong Jianfei Xu Yuhang Zhang Suhang Ding Wenwang Wu Re Xia | 2022 | Acta Mechanica Solida Sinica2022，35，4： | 0 |
| 13 | Surfaced-modified TiO_(2) Nanofibers with Enhanced Photodegradation Under Visible Light显示文摘Asynchronized surface modification method based on coaxial electrospinning was developed to fabricate high-efficiency photodegradative nanofiber for water purification. TiO_(2) nanoparticles assembled uniformly on the surface of polycaprolactone(PCL) nanofibers to form composite nanofibers through one step process. The maximal content of Ti element was 25.6%(mass fraction) in the PCL/TiO_(2) composite nanofibrous membrane, which exhibited hydrophilicity and excellent photodegradation under visible light in water. The Rhodamine B dye degraded 96.17% in 120 min under visible light by the PCL/TiO_(2) composite membrane. The adsorption behavior fitted Langmuir model well and indicated chemical related adsorption. This PCL/TiO_(2) composite nanofibrous membrane has super degradation properties and displays great application potential to environmental protection. | PENG Hao JIANG Jiaxin LIUYifang WANG Xiang LI Wenwang ZHENG Gaofeng | 2022 | Chemical Research in Chinese Universities2022，38，6： | 0 |
| 14 | The localigation of enzyme activity on the membran of endosome显示文摘 | GuangjunLi WenWang HoushuoLi | 2004 | 中国组织化学与细胞化学杂志2004，13，3： | 0 |
| 15 | Fracture toughness and destructive mechanism of ductile nanoporous metallic glass and its crystal-impregnated nanocomposite显示文摘Nanoporous metallic glasses(NPMGs)and crystalline/amorphous nanocomposites exhibit superior ductility over bulk macroscopic metallic glasses(MGs).Their fracture behaviors remain a mystery due to experimental technical limitations.In this work,the fracture behaviors of pre-cracked NPMGs and crystal-impregnated nanoporous metallic glasses(CINPMGs)are investigated through large-scale molecular dynamics simulations,and the MG and crystal phases are amorphous Cu_(50)Zr_(50)and crystalline B2CuZr,respectively.Fracture toughness is determined by simultaneously considering the surface energy and plastic dissipated energy.Our results confirm the excellent plasticity of both the pre-cracked NPMGs and CINPMGs.The progressive necking and ductile rupture of ligaments are responsible for generating NPMGs with prominent ductility and fracture toughness.Meanwhile,secondary cracking is also triggered,which can consume energy without extending the major crack,thus further improving fracture resistance.It is also found that the fracture toughness of NPMGs can be improved by increasing the solid fraction of MG,and linear relation between fracture toughness and solid fraction can be expected.Crystal impregnation effectively inhibits global failure as the crystal phase shields the individual amorphous ligaments.Homogeneous plastic flow characterized by shear bands is observed in CINPMGs,and this homogeneous global deformation is facilitated by the crystalline/amorphous interface.Besides,the fracture toughness of CINPMGs is higher than that of the constituent single phases,regardless of the volume fraction of each phase.Ashby material charts manifest that these two types of materials demonstrate promising potential in the material selection library for advanced structural design. | ZHANG YuHang XU JianFei HU YiQun SU Lei DING SuHang WU WenWang XIA Re | 2023 | Science China(Technological Sciences)2023，66，11： | 0 |
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