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| 1 | Nanotwinned and hierarchical nanotwinned metals:a review of experimental,computational and theoretical efforts显示文摘The recent studies on nanotwinned(NT)and hierarchical nanotwinned(HNT)face-centered cubic(FCC)metals are presented in this review.The HNT structures have been supposed as a kind of novel structure to bring about higher strength/ductility than NT counterparts in crystalline materials.We primarily focus on the recent developments of the experimental,atomistic and theoretical studies on the NT and HNT structures in the metallic materials.Some advanced bottom-up and top-down techniques for the fabrication of NT and HNT structures are introduced.The deformation induced HNT structures are available by virtue of severe plastic deformation(SPD)based techniques while the synthesis of growth HNT structures is so far almost unavailable.In addition,some representative molecular dynamics(MD)studies on the NT and HNT FCC metals unveil that the nanoscale effects such as twin spacing,grain size and plastic anisotropy greatly alter the performance of NT and HNT metals.The HNT structures may initiate unique phenomena in comparison with the NT ones.Furthermore,based on the phenomena and mechanisms revealed by experimental and MD simulation observations,a series of theoretical models have been proposed.They are effective to describe the mechanical behaviors of NT and HNT metals within the applicable scope.So far the development of manufacturing technologies of HNT structures,as well as the studies on the effects of HNT structures on the properties of metals are still in its infancy.Further exploration is required to promote the design of advanced materials. | Ligang Sun Xiaoqiao He Jian Lu | 2018 | npj Computational Materials2018，，1： | 14 |
| 2 | High-precision geochronology of the Early Cretaceous Yingcheng Formation and its stratigraphic implications for Songliao Basin,China显示文摘The Songliao Basin in Northeast Asia is the largest and longest-lived rift basin and preserves a nearcontinuous continental succession of the most of the Cretaceous period,providing great material to investigate the adaption of the terrestrial systems to the Cretaceous greenhouse climate and tectonic events.However,the paucity of precise and accurate radioisotopic ages from the Early Cretaceous strata of the Songliao Basin has greatly held back the temporal and causal correlation of the continental records to the global Early Cretaceous records.Three tuff layers intercalated in the Yingcheng Formation have been intercepted by the SK-2 borehole,which offer excellent materials for radioisotopic dating and calibration of the chronostratigraphy of the Lower Cretaceous sequence of Songliao Basin.Moreover,the Yingcheng Formation recorded the largest and the last of the two major volcanic events in Songliao Basin,which also represents a turning point in the basin evolution history of Songliao from syn-rift stage to post-rift stage.Here we report high-precision U–Pb zircon geochronology by the CA-ID-TIMS technique on three tuff samples from the Yingcheng Formation of the SK-2 borehole in the Songliao Basin to construct a greatly improved,absolute age framework for the Yingcheng Formation and provide crucial age constraints for the Songliao Lower Cretaceous Strata.The new CA-ID-TIMS geochronology constrained the Yingcheng Formation at 102.571+0.320/-2.346 Ma to ca.113 Ma,correlating to the Albian Stage.Combined with the previous published Songliao geochronology,the Quantou Formation is constrained to between 96.442+0.475/-0.086 Ma and 91.923+0.475/-0.086 Ma;the Denglouku Formation is constrained to between 102.571+0.320/-2.346 Ma and 96.442+0.475/-0.086 Ma;the age of the Shahezi Formation is estimated at ca.113 Ma to ca.118 Ma,which could extend to ca.125 Ma in some locations in Songliao Basin.The major unconformity between the Yingcheng Formation and the Denglouku Formation,which represents the transition of the basin from syn-rift to post-rift is thus confined to between 102.571+0.320/-2.346 Ma and 96.442+0.475/-0.086 Ma.This is roughly contemporaneous with the change in the direction of the paleo-Pacific plate motion from west-southwest to north or northwest in mid-Cretaceous,suggesting their possible connections. | Tiantian Wang Chengshan Wang Jahandar Ramezani Xiaoqiao Wan Zhiqiang Yu Youfeng Gao Huaiyu He Huaichun Wu | 2022 | Geoscience Frontiers2022，13，4： | 5 |
| 3 | Study on Seed Germination Conditions and in vitro Tissue Culture of Lilium formolongi显示文摘To facilitate the rapid production of lily(Lilium formolongi),conditions favoring the germination of dormant lily seeds and in vitro regeneration from tissue culture were studied,using the germinating plumule as the explants.The optimal inducing conditions for dormant lily dry seeds to germinate were low temperature(10 ℃) treatment for one hour followed by incubating at 18 ℃ with light illumination.After 8 days of incubation/induction,over 90% of the seeds were germinated.MS+6-BA 1.0 mg/L +NAA 0.5 mg/L was the most efficient medium formula in lily callus induction.MS+6-BA 2.0 mg/L +NAA 0.5 mg/L was the optimal medium for calli growth.1/2MS+NAA 1.0 mg/L was the medium gave the highest root inductive rate. | Bo WANG Yongping ZHU Xiaojie QIN Qiongjie LI Xiaoqiao WANG Fengmei HE | 2012 | Agricultural Biotechnology2012，1，3： | 2 |
| 4 | Strongly coupled simulation of fluid-structure interaction in a Francis hydroturbine显示文摘 | Wang Wenquan He Xiaoqiao Zhang Lixiang | 2009 | International Journal for Numerical Methods in Fluids2009，60，5： | 1 |
| 5 | Strongly coupled simulation of fluid-structure interaction in a Francis hydroturbine 显示文摘 | Wang Wenquan He Xiaoqiao Zhang Lixiang | 2009 | International Journal for Numerical Methods in Fluids2009，60，： | 1 |
| 6 | Strongly Coupled Simulation of Fluid-structure In- teraction in a Francis Hydroturbine显示文摘 | Wang Wenquan He Xiaoqiao Zhang Lixiang | 2009 | International Journal for Numerical Methods in Fluids2009，60，5： | 1 |
| 7 | Strongly coupled simulation of fluid-structure interaction in a Francis hydroturbine 显示文摘 | Wang Wenquan He Xiaoqiao Zhang Lixiang | 2009 | International Joumal for Numerical Methods in Fluids2009，60，： | 1 |
| 8 | Competitiveness of alga Microcystis aeruginosa co-cultivated with cyanobacterium Raphidiopsis raciborskii confirms its dominating position显示文摘Microcystis aeruginosa has always been regarded as the main culprit of cyanobacterial blooms in freshwater.However,in recent years,Raphidiopsis raciborskii has gradually replaced M.aeruginosa as the culprit of cyanobacterial blooms in some tropical and subtropical shallow lakes.To reveal which one plays a more dominant role,interactions between cylindrospermospin(CYN)-producing R.raciborskii and microcystins(MCs)-producing or non-MCs-producing M.aeruginosa strains were studied using bialgal cultures at different initial ratios of biomasses of the two species at 25℃.During the co-cultivation,the M.aeruginosa strains inhibited the growth and heterocyst formation of R.raciborskii filaments,and thus occupied a dominant position during the co-cultivation regardless of the initial biomass ratios in the cultures.In addition,the MCs-producing M aeruginosa strain contributed to a higher portion of the total biomass and exerted a stronger inhibitory effect on R.raciborskii compared with the non-MCs-producing strain.However,the growth of both MCs-producing and non-MCs-producing M.aeruginosa strains was stimulated by R.raciborskii in the co-cultures compared with M.aeruginosa monoculture,indicating that M.aeruginosa could outcompete R.raciborskii if given enough time,enabling it to develop into the dominant species even in very low initial concentration.To our best knowledge,this is the first report on the loss of heterocyst formation by a species of cyanobacteria that resulted from interactions between two different species of cyanobacteria.These findings indicate that it is difficult for R.raciborskii to replace the dominant position of M.aeruginosa under the experimental environmental condition,and the allelopathic effects of M.aeruginosa on R.raciborskii could significantly contribute to the success of M.aeruginosa. | Zengling MA Xiaoqiao ZHANG Renhui LI Min WANG Wenli QIN He ZHANG Gang LI Henguo YU Chuanjun DAI Min ZHAO | 2022 | Journal of Oceanology and Limnology2022，40，5： | 1 |
| 9 | The bi- stable behaviors of carbon-fibre/epoxy anti-symmetric com- posite shells显示文摘 | ZHANG Zheng WU Helong HE Xiaoqiao | 2012 | Composites Part B: Engineering2012，47，： | 1 |
| 10 | Super square carbon nanotube network: a new promising water desalination membrane显示文摘Super square(SS)carbon nanotube(CNT)networks,acting as a new kind of nanoporous membrane,manifest excellent water desalination performance.Nanopores in SS CNT network can efficiently filter NaCl from water.The water desalination ability of such nanoporous membranes critically depends on the pore diameter,permitting water molecule permeatration while salt ion obstruction.On the basis of the systematical analysis on the interaction among water permeability,salt concentration limit and pressure on the membranes,an empirical formula is developed to describe the relationship between pressure and concentration limit.In the meantime,the nonlinear relationship between pressure and water permeability is examined.Hence,by controlling pressure,optimal plan can be easily made to efficiently filter the saltwater.Moreover,steered molecular dynamics(MD)method uncovers bending and local buckling of SS CNT network that leads to salt ions passing through membranes.These important mechanical behaviours are neglected in most MD simulations,which may overestimate the filtration ability.Overall,water permeability of such material is several orders of magnitude higher than the conventional reverse osmosis membranes and several times higher than nanoporous graphene membranes.SS CNT networks may act as a new kind of membrane developed for water desalination with excellent filtration ability. | Ligang Sun Xiaoqiao He Jian Lu | 2016 | npj Computational Materials2016，，1： | 1 |
| 11 | Free Vibration Analysis of Single-Layered Graphene Sheets Based on a Continuum Model显示文摘 | Jinbao Wang Meiling Tian Xiaoqiao He Zhibo Tang | 2014 | 应用物理前沿(中英文版)2014，2，1： | 0 |
| 12 | Analysis of transient responses in a laminated piezoelectric cylindrical shell显示文摘A hybrid numerical method is proposed for analysis of transient responses in a multilayered piezoelectric cylindrical shell.In the present method,the associated equations of the displacement field and the electro-potential field are developed using an analytical-numerical method.The piezoelectric cylindrical shell is discretized into layered annular elements along the wall thickness direction.The governing equations are determined by Hamilton's Principle considering the coupling between the elastic and electric field in each element.The modal analysis and Fourier transformation with respect to the spatial cylindrical polar coordinates in the direction of wave propagation are introduced to formulate the displacement field and electro-potential field in the wave-number domain.The results of transient responses at any location can be obtained by performing an inverse Fourier transformation.The transient responses of an actual piezoelectric cylindrical shell excited by a coupled electro-mechanical circular line load are investigated as a numerical example.The computational results demonstrate the efficiency of the present method. | HAN Xu GONG Shuang HE XiaoQiao JIANG Chao | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，1： | 0 |
| 13 | Hierarchical-vortex polarization domain pattern in nano polycrystalline ferroelectric显示文摘Domain pattern is the carrier of electromechanical property.A novel domain pattern will open a gate for ferroelectric nano device.A distinctive topological domain pattern termed as hierarchical vortex(Hvo)has been found in polycrystalline ferroelectric based on the first-principles-based atomistic method.The Hvo pattern displays a unique structure,which is a flux-closing vortex encircle an anti-vortex or a vortex and anti-vortex pair(VA).Each Hvo structure could be regarded as a single vortex to forming a vortex-anti-vortex pair with anti-vortex or forming a vortex-vortex array with the vortex.The mechanism of HVo obtained in polycrystalline ferroelectric has been found that the grain boundary(GB)equals the domain wall when the first-order vortex is in the vortex.The HVo will open a new view of the domain topology pattern and its evolution. | Zhiyong Huang Qinan Li Yin Liang Xiaoqiao He Jiagang Wu Haidong Fan Xiaobao Tian | 2022 | Journal of Advanced Dielectrics2022，12，4： | 0 |
| 14 | Pushing the Electrochemical Performance Limits of Polypyrrole Toward Stable Microelectronic Devices显示文摘Conducting polymers have achieved remarkable attentions owing to their exclusive characteristics,for instance,electrical conductivity,high ionic conductivity,visual transparency,and mechanical tractability.Surface and nanostructure engineering of conjugated conducting polymers offers an exceptional pathway to facilitate their implementation in a variety of scientific claims,comprising energy storage and production devices,flexible and wearable optoelectronic devices.A two-step tactic to assemble high-performance polypyrrole(PPy)-based microsupercapacitor(MSC)is utilized by transforming the current collectors to suppress structural pulverization and increase the adhesion of PPy,and then electrochemical co-deposition of PPy-CNT nanostructures on rGO@Au current collectors is performed.The resulting fine patterned MSC conveyed a high areal capacitance of 65.9 mF cm^(−2)(at a current density of 0.1 mA cm^(−2)),an exceptional cycling performance of retaining 79%capacitance after 10,000 charge/discharge cycles at 5 mA cm^(−2).Benefiting from the intermediate graphene,current collector free PPy-CNT@rGO flexible MSC is produced by a facile transfer method on a flexible substrate,which delivered an areal capacitance of 70.25 mF cm^(−2) at 0.1 mA cm^(−2) and retained 46%of the initial capacitance at a current density of 1.0 mA cm^(−2).The flexible MSC is utilized as a skin compatible capacitive micro-strain sensor with excellent electromechanochemical characteristics. | Muhammad Tahir Liang He Lihong Li Yawei Cao Xiaoxia Yu Zehua Lu Xiaoqiao Liao Zeyu Ma Yanlin Song | 2023 | Nano-Micro Letters2023，15，4： | 0 |
| 15 | Theory and Calculation of the J-Integral for Coupled Chemo-Mechanical Fracture Mechanics显示文摘In this paper,by introducing a chemical field,the J-integral formulation is presented for the chemo-mechanical coupled medium based on the laws of thermodynamics.A finite element implementation of the J-integral was performed to study the mode I chemo-mechanical coupled fracture problem.For derivation of the coupled J-integral,the equivalent domain integral(EDI)method was applied to obtain the mode I J-integral,with expression of the area integrals based on constitutive relationships of a linear elastic small deformation for chemo-mechanical coupling,instead of the finite deformation problem.A finite element procedure is developed to compute the mode I J-integral,and numerical simulation of the y-direction stress field is studied by a subroutine UEL(User defined element)developed in ABAQUS software.Accuracy of the numerical results obtained using the mode I J-integral was verified by comparing them to a well-established model based on linear elastic fracture mechanics(LEFM).Furthermore,a numerical example was presented to illustrate path-independence of the formulated J-integral for a chemo-mechanical coupled specimen under different boundary conditions,showing a high accuracy and reliability of the present method.The variation laws of J-integral and the y-direction stress field with external chemical,mechanical loading and time are revealed.The J-integral value increases with larger external concentration loading in the same integral domain.The extent of diffusion is much greater with larger concentration,which leads to a stronger coupling effect due to the chemical field.This work provides new insights into the fracture mechanics for the chemo-mechanical coupled medium. | Wei Wei Qingsheng Yang Xia Liu Xiaoqiao He Kim-Meow Liew | 2018 | Computer Modeling in Engineering & Sciences2018，，6： | 0 |
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