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| 1 | RBMDO Using Gaussian Mixture Model-Based Second-Order Mean-Value Saddlepoint Approximation显示文摘Actual engineering systems will be inevitably affected by uncertain factors.Thus,the Reliability-Based Multidisciplinary Design Optimization(RBMDO)has become a hotspot for recent research and application in complex engineering system design.The Second-Order/First-Order Mean-Value Saddlepoint Approximate(SOMVSA/-FOMVSA)are two popular reliability analysis strategies that are widely used in RBMDO.However,the SOMVSA method can only be used efficiently when the distribution of input variables is Gaussian distribution,which significantly limits its application.In this study,the Gaussian Mixture Model-based Second-Order Mean-Value Saddlepoint Approximation(GMM-SOMVSA)is introduced to tackle above problem.It is integrated with the Collaborative Optimization(CO)method to solve RBMDO problems.Furthermore,the formula and procedure of RBMDO using GMM-SOMVSA-Based CO(GMM-SOMVSA-CO)are proposed.Finally,an engineering example is given to show the application of the GMM-SOMVSA-CO method. | Debiao Meng Shiyuan Yang Tao Lin Jiapeng Wang Hengfei Yang Zhiyuan Lv | 2022 | Computer Modeling in Engineering & Sciences2022，，8： | 6 |
| 2 | Several boundary identification methods of gravity data and application in Vientiane of Laos area显示文摘The authors studied the potential field boundary identification of the new technology in order to find out the possible fractures or contact zones using the following methods such as tilt derivative,horizontal derivative of tilt derivative,normalized standard deviation and normalized differential method. Combined with Euler deconvolution and small subdomain filtering,the actual data processing results show that these methods are all able to identify wider range extending fractures and obtain abundant geological information. The horizontal derivative of tilt derivative and normalized differential method have a better resolution for the small cutting fractures and lacunae in the studied area. They provide a reliable basis for study of the cutting relationship between fractures. | LI Lin WU Yangang YANG Changbao HUAN Hengfei GUO Cancan | 2014 | Global Geology2014，17，1： | 2 |
| 3 | The influence of microtexture on the formation mechanism of nodules in Zircaloy-4 alloy tube显示文摘Corrosion re sistance of Zircaloy-4 alloy tube in superheated steam at 673 K/10.3 MPa is anisotropic.A part of the surface undergoes uniform corrosion while the other suffers nodular corrosion.Narrow and wide nodules are observed after an exposure period of 3 and 30 days,respectively.A new matrix transformation method is established in order to study the formation mechanism of nodules in the cross-section(CS) of Zircaloy-4 alloy tube using the EBSD technique,while the CS perpendicular to axial direction(AD).The results reveal that the microtexture is a key factor behind the two types of corrosion.Furthermore,the oxide layers grow anisotropically over the corroded surface.A thick oxide layer forms over the nodular corrosion region on the grains with c-axis oriented in the range of 40° around tangential direction(TD),whereas a thin oxide layer over the uniform corrosion region is detected on the grains with c-axis oriented in the range of 68° around TD.In short,the anisotropic growth of oxide layer was caused by the change of microtexture of the Zr-4 alloy tube,and this anisotropic growth of oxide layer contributed to the nodules formation. | Yingdong Zhang Fusen Yuan Fuzhou Han Muhammad Ali Wenbin Guo Geping Li Chengze Liu Hengfei Gu | 2020 | Journal of Materials Science & Technology2020，47，12： | 2 |
| 4 | A new difference scheme with high accuracy and absolute stability for solving convectiondiffusion equations显示文摘 | DING Hengfei ZHANG Yunxin | 2009 | J Comput and Appl Math2009，230，2： | 1 |
| 5 | Does ultrasonographic measurement of the inferior vena cava diameter correlate with central venous pressure in the assessment of intravascularvolume in patients undergoing gastrointestinal surgery?显示文摘 | Xiaobao Z Hengfei L Pin Z | 2014 | JSurg Res2014，191，2： | 1 |
| 6 | Curcumin is a biologically active copper chelator with antitumor activity显示文摘 | Wei Zhang Changmai Chen Hengfei Shi Manyi Yang Yu Liu Ping Ji Huijun Chen Ren Xiang Tan Erguang Li | 2015 | Phytomedicine2015，，： | 1 |
| 7 | A New Difference Scheme with High Accuracy and Absolute Stability for Solving Convection_ Diffusion Equations 显示文摘 | Hengfei Ding Yuxin Zhang | 2009 | Journal of Computational and Applied Mathematics2009，，230： | 1 |
| 8 | Numerical Algorithm for the Time-Caputo and Space-Riesz Fractional Diffusion Equation显示文摘In this paper,we develop a novel fi nite-diff erence scheme for the time-Caputo and space-Riesz fractional diff usion equation with convergence order O(τ^2−α+h^2).The stability and convergence of the scheme are analyzed by mathematical induction.Moreover,some numerical results are provided to verify the eff ectiveness of the developed diff erence scheme. | Yuxin Zhang Hengfei Ding | 2020 | Communications on Applied Mathematics and Computation2020，2，1： | 1 |
| 9 | Does ultrasonographic measurement of the inferior vena cava diameter correlate with central venous pressure in the assessment of intravascular volume in patients undergoing gastrointestinal surgery?显示文摘 | Xiaobao Zhang Hengfei Luan Pin Zhu Jiying Feng Jizheng Cui Zhibin Zhao | 2014 | Journal of Surgical Research2014，，： | 1 |
| 10 | Nano-refinement of the face-centered cubic Zr(Fe,Cr)_(2)secondary phase particles in Zircaloy-4 alloy via localized-shearing/bending-driven fracture under high-temperature compression显示文摘Nanoparticles are extensively introduced to improve the mechanical,physical,and chemical properties of alloys.In the present study,the underlying nano-refinement mechanisms of face-centered cubic Zr(Fe,Cr)_(2)secondary phase particles(SPPs)that precipitated in Zircaloy-4 alloy under high-temperature compression were investigated in detail by utilizing high-resolution transmission electron microscopy(HRTEM)and conventional TEM techniques.The frequently observed Zr(Fe,Cr)_(2)SPPs were incoherent with the matrix and exhibited brittle fracture behaviors without measurable plasticity.HRTEM observations revealed two mechanisms underlying the nano-refinement of incoherent micro-sized SPPs via localized shear fracture on{11¯2}SPP and nanoprecipitate-assisted bending fracture,respectively.The latter was,for the first time,found to occur when the movements of large SPPs were blocked by nanometer-sized SPP during alloy deformation.Accordingly,two force models were proposed to visualize their potential nano-refinement processes.The knowledge attained from this study sheds new light on the deformation behaviors of Zr(Fe,Cr)_(2)SPPs and their associated size refinement mechanisms under high-temperature compression,and is expected to greatly benefit the process optimization of zirconium alloys to achieve precipitate nano-refinement. | Fuzhou Han Geping Li Fusen Yuan Wenbin Guo Jie Ren Qichen Wang Yingdong Zhang Ali Muhammad Chengze Liu Hengfei Gu | 2023 | Journal of Materials Science & Technology2023，，34： | 0 |
| 11 | Photonic graphene with reconfigurable geometric structures in coherent atomic ensembles显示文摘Photonic graphene,possesses a honeycomb-like geometric structure,provides a superior platform for simulating photonic bandgap,Dirac physics,and topological photonics.Here,the photonic graphene with reconfigurable geometric structures is demonstrated in a 5S_(1/2)–5P_(3/2)–5D_(5/2) cascade-type 85Rb atomic ensembles.A strong hexagonal-coupling field,formed by the interference of three identical coupling beams,is responsible for optically inducing photonic graphene in atomic vapor.The incident weak probe beam experiences discrete diffraction,and the observed pattern at the output plane of vapor cell exhibits a clear hexagonal intensity distribution.The complete photonic graphene geometries from transversely stretched to longitudinally stretched are conveniently constructed by varying the spatial arrangement of three coupling beams,and the corresponding diffraction patterns are implemented theoretically and experimentally to map these distorted geometric structures.Moreover,the distribution of lattice sites intensity in photonic graphene is further dynamically adjusted by two-photon detuning and the coupling beams power.This work paves the way for further investigation of light transport and graphene dynamics. | Fuqiang Niu Hengfei Zhang Jinpeng Yuan Liantuan Xiao Suotang Jia Lirong Wang | 2023 | Frontiers of physics2023，18，5： | 0 |
| 12 | A GREENING NATION China’s achievements in afforestation have fueled confidence in the country’s ability to meet its commitment to increasing forest stock显示文摘China has been conducting a“greening the motherland”campaign as part of its national environmental policy.Chinese people are usually educated on the importance of planting trees and start practicing at a young age.Thanks to decades of sustained efforts,vast expanses of desert in China have turned green,resulting in a greatly-improved local environment. | Zheng Meichen Hong Hengfei Chen Manjiao | 2021 | China Report ASEAN2021，6，8： | 0 |
| 13 | Segmentation of the Ventricle Membranes in Short-Axis Sequences by Optical Flow Base on DLSRE Model显示文摘Recent studies have pointed out that the boundary of the extracted ventricle membranes is unsmooth,and the segmentation of the cardiac papillary muscle and trabecular muscle do inconformity the clinical requirements.To address these issues,this paper proposes an automatic segment algorithm for continuously extracting ventricle membranes boundary,which adopts optical flow field information and sequential images information.The images are cropped by frame difference method,which according to the continuity of adjacent slices of cardiac MRI images.The roughly boundary of epicardium is extracted by the Double level set region evolution(DLSRE)model,which combines image global information,local information and edge information.The ventricle endocardium and epicardial contours are tracked according to the optical flow field information between image sequences.The segmentation results are optimized by Delaunay triangulation algorithm.The experimental results demonstrate that the proposed method can improve the accuracy of segmenting the ventricle endocardium and epicardium contours,and segment the contour of the smooth ventricle membrane edge that meets the clinical definition. | LI Lin WU Hengfei LI Junhua | 2021 | Chinese Journal of Electronics2021，30，3： | 0 |
| 14 | A Study of the Pion from BLFQ显示文摘We study the properties of the pion through the light-front wave function(LFWF)obtained from a basis lightfront quantization(BLFQ)approach[1−4].BLFQ is a nonperturbative approach to quantum field theory based on the Hamiltonian formalism.In order to make the numerical calaulation feasible. | Lan Jiangshan Chandan Mondal Zhao Hengfei Zhao Xingbo | 2019 | IMP & HIRFL Annual Report2019，，1： | 0 |
| 15 | Extent and spatial distribution of terrace abandonment in China显示文摘Driven by urbanization and industrialization,arable land in hilly and mountainous regions of China is gradually becoming marginalized,with the extent of arable land abandonment rapidly expanding from poor-quality sloping arable land to high-quality terraces.The abandonment of large-scale terraces will lead to a series of socio-economic and ecological effects.A national sample survey was used to investigate the extent and spatial distribution of terrace abandonment in China,and a total of 560 valid village questionnaires from 329 counties were collected in the mountainous areas of China.The main findings are as follows:(1)The phenomenon of terrace abandonment was widespread throughout the country,with 54% of the total surveyed villages exhibiting terrace abandonment,and the area of abandoned terraces accounting for 9.79% of the total.(2) The degree of terrace abandonment is high in the south and low in the north.The most serious region with abandonment was the hilly and mountainous areas in the south,especially in the middle and lower Yangtze River region.(3)The main driving factors of terrace abandonment were rural labor migration,agricultural mechanization level,irrigation conditions,and transportation conditions for cultivation.Targeted measures should be taken based on the specific conditions of each area to alleviate terrace abandonment.Measures such as improving terrace mechanization are universally applicable.Specifically,low-quality terraces can be withdrawn orderly,and for high-quality terraces,multiple measures are needed to consolidate agricultural production,such as adjusting the planting structure,strengthening agricultural infrastructure construction,and encouraging the transfer of land-use rights as well as large-scale operation. | DONG Shijie XIN Liangjie LI Shengfa XIE Hualin ZHAO Yuluan WANG Xue LI Xiubin SONG Hengfei LU Yahan | 2023 | Journal of Geographical Sciences2023，33，7： | 0 |
| 16 | A new type face-centered cubic zirconium phase in pure zirconium显示文摘So far,only two orientation relationships(OR)between hexagonal close-packed(HCP)(αphase)and facecentered cubic(FCC)structures in zirconium and titanium alloys have been reported.Here a new type FCC phase(named γ phase)with OR:<11■0>_(α)‖<100>_(γ) and{0001}_(α)‖{002}_(γ) was observed for the first time in annealed pure zirconium by means of transmission electron microscopy(TEM)technique.The α→γ phase transformation can be accomplished via expansion along[1■00]direction and slip of Shockley partial dislocation with 1/3[1■00]on(0001)basal planes. | Fusen Yuan Geping Li Fuzhou Han Yingdong Zhang Ali Muhammad Wenbin Guo Jie Ren Chengze Liu Hengfei Gu Gaihuan Yuan | 2021 | Journal of Materials Science & Technology2021，，22： | 0 |
| 17 | Synthesis and potential osteogenic applications of Wnt3a-loaded ZIF-8 nanoparticles显示文摘The Wnt signaling pathway plays a critical role in bone homeostasis,and the related protein therapy strategies have been reported to have great potential in osseointegration;however,they face formidable challenges such as complex external environments and unavoidable protein denaturation.In this work,we report a novel approach combining the synthesis of metal–organic frameworks(MOFs)and protein encapsulation in a one-pot process based on zeolitic imidazolate framework-8(ZIF-8)and Wnt3a protein,with improved biomechanical behavior and enhanced protein biological response.This combination was designed to enhance the Wnt3a protein function through the improved chemical stability provided by the ZIF-8 crystals.Additionally,the zinc ions contained in the ZIF-8 crystals induced bone homeostasis,further favoring the osteogenesis.The results showed that the Wnt3a protein-loaded ZIF-8 crystals served as efficient drug delivery vehicles to promote osteogenesis,preventing protein denaturation.In particular,Wnt3a-loaded ZIF-8 nanoparticles(Wnt3a@ZIF-8 NPs)had higher efficacy on bone marrow mesenchymal stem cells(BMSCs)than ZIF-8 NPs or Wnt3a proteins,contributing to the osteogenesis through ZIF-8 crystals and intracellular Wnt3a proteins released from Wnt3a@ZIF-8 NPs.Furthermore,polymerase chain reaction(PCR)analysis showed that the osteogenic pathways were upregulated.Overall,the present one-pot process can open up new avenues to develop signaling protein-delivery systems for applications in protein therapy strategies. | Hengfei Wang Song Chen Zihan He Junyu Chen Zhou Zhu Qianbing Wan Jian Wang Xibo Pei | 2024 | Chinese Chemical Letters2024，35，3： | 0 |
| 18 | Fabrication of Pd-Nb bimetallic doped organosilica membranes by different metal doping routes for H_(2)/CO_(2) separation显示文摘Monometallic doping has proved its superiority in improving either permselectivity or H_(2) permeability of organosilica membranes for H_(2)/CO_(2) separation,but it is still challenging to break the trade-off effect.Herein,we report a series of Pd-Nb bimetallic doped 1,2-bis(triethoxysilyl)ethane(Pd-Nb-BTESE,PNB)membranes with different metal doping routes for simultaneously improving H_(2) permeance and H_(2)/CO_(2) permselectivity by the synergetic effects of Pd and Nb.The doped Pd can exist in the BTESE network as nanoparticles while the doped Nb is incorporated into BTESE network forming Nb-O-Si covalent bonds.The metal doping routes significantly influence the microstructure of PNB networks and gas separation performance of the PNB membranes.We found that the PNB membrane with Pd doping priority(PNB-Pd)exhibited the highest surface area and pore volume,comparing with Nb doping priority(PNB-Nb)or Pd-Nb simultaneous doping(PNB-PdNb).The PNB-Pd membrane could not only exhibit an excellent H_(2) permeance of~10^(−6) mol·m^(−2)·s^(−1)·Pa^(−1) but also a high H_(2)/CO_(2) permselectivity of 17.2.Our findings may provide novel insights into preparation of bimetallic doped organosilica membranes with excellent H_(2)/CO_(2) separation performance. | Hengfei Zhang Yibin Wei Shufeng Niu Hong Qi | 2021 | Chinese Journal of Chemical Engineering2021，34，8： | 0 |
| 19 | Uncertainty-based Multidisciplinary Design Optimization using An Approximated Second-Order Reliability Analysis Strategy显示文摘In uncertainty-based multidisciplinary design optimization(UBMDO),all reliability limitation factors are maintained due to minimize the cost target function.There are many reliability evaluation methods for reliability limitation factors.The second-order reliability method(SORM)is a powerful most possible point(MPP)-based method.It can provide an accurate estimation of the failure probability of a highly nonlinear limit state function despite its large curvature.But the Hessian calculation is necessary in SORM,which results in a heavy computational cost.Recently,an efficient approximated second-order reliability method(ASORM)is proposed.The ASORM uses a quasi-Newton method to close to Hessian without the direct calculation of Hessian.To further improve the UBMDO efficiency,we also introduce the performance measure approach(PMA)and the sequential optimization and reliability assessment(SORA)strategy.To solve the optimization design problem of a turbine blade,the formula of MDO with ASORM under the SORA framework(MDO-ASORM-SORA)is proposed. | Zhiyuan LYU Hongtao WANG Hengfei YANG Jiapeng WANG Ketema Mikiyas Solomon Debiao MENG | 2022 | Mechanical Engineering Science2022，4，1： | 0 |
| 20 | A Note on Numerical Algorithm for the Time-Caputo and Space-Riesz Fractional Diffusion Equation显示文摘Recently,Zhang and Ding developed a novel finite difference scheme for the time-Caputo and space-Riesz fractional diffusion equation with the convergence order 0(ι^(2-a)+h^(2))in Zhang and Ding(Commun.Appl.Math.Comput.2(1):57-72,2020).Unfortunately,they only gave the stability and convergence results for a∈(0,1)andβ∈[7/8+^(3)√621+48√87+19/8^(3)√621+48√87,2]In this paper,using a new analysis method,we find that the original difference scheme is unconditionally stable and convergent with orderΟ(ι^(2-a)+h^(2))for all a∈(0,1)andβ∈(1,2].Finally,some numerical examples are given to verify the correctness of the results. | Junhong Tian Hengfei Ding | 2021 | Communications on Applied Mathematics and Computation2021，3，4： | 0 |
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