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Superior mechanical and thermal properties than diamond:Diamond/lonsdaleite biphasic structure

Journal of Materials Science & technology 2020年第13期47卷 114-122页

作者： Bo Yang Xianghe Peng Yinbo Zhao Deqiang Yin Tao Fu Cheng Huang College of Aerospace Engineering Chongqing UniversityChongqing 400044China State Key Laboratory of Coal Mining Disaster Dynamics and Control Chongqing UniversityChongqing 400044China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China

It has been found recently in experiments that diamond/lonsdaleite biphase could possess excellent thermal-mechanical properties,implying that the properties of carbon materials can be improved by reasonably designing their internal *** mechanism of the excellent performance arising from biphasic structure is still unknown and needs to be *** this paper,we established a series of possible diamond/lonsdaleite biphasic structures and revealed the optimization mechanism of the biphasic structure using first principles *** shows in our ab-initio molecular dynamics simulations that the lonsdaleite cannot exist stably at room temperature,which could explain why pure lonsdaleite can hardly be found or *** analysis shows that partial slip would occur in the lonsdaleite region if the applied strain is sufficiently large,leading to the transition from biphasic phase to cubic ***,further shear strain would be applied along the hard shear direction of the cubic structure,resulting in an ascent of *** results presented could offer an insight into the structural transformation at high temperature and large strain.

关键词： Ultrahard carbon materials Biphasic structure Extreme shear strain Phase transition First principle calculation

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3D Visual Simulation of Swaying Motion of Surface Vessel Based on Given Power Spectral Density 33

3D Visual Simulation of Swaying Motion of Surface Vessel Bas...

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第33届中国控制与决策会议

作者： Zhilin Liu Zhongxin Wang Jiayue Jiang Shouzheng Yuan Key Laboratory of Intelligent Technology and Application of Marine Equipment (Harbin Engineering University) Ministry of Education College of Intelligent Systems Science and Engineering Harbin Engineering University

ISBN: (纸本)9781665431293

When the surface vessel is parked on the sea,it can be affected by various external interference,*** six-degree-of-freedom swaying motion can be produced by sea *** order to better study the swaying motion of the surface vessel under the irregular waves,based on the given swaying power spectral density,a method of converting power spectral density into time-domain signals is proposed,and then the spectrum analysis method can be adopted to carry out the research of the surface vessel *** virtual simulation technology is used so as to visually observe the motion of the surface vessel under random *** model required for simulation is established in the Multigen Creator software,and the environment required for simulation is configured in Vega ***,VC++is used to develop the software framework,human-computer interaction,and other functions,where the Matlab engine should be called for the design of algorithm ***,serial communication technology is used to realize real-time physical communication,completing the design of the 3 D visual simulation *** simulation results show that the power spectral density can be effectively converted into a time-domain signal through the given algorithm,and the swaying motion of surface vessel can be reproduced under the converted time-domain signal using the three-dimensional simulation software.

关键词： Surface Vessel Sway Power Spectral Density Time-domain Visual Simulation

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Bending strength and fracture surface topography of natural fiber-reinforced shell for investment casting process

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China Foundry 2016年第3期13卷 211-216页

作者： Kai Lü Xiang-dong Liu Zhao-xin Du Yan-fen Li School of Materials Science and Engineering inner Mongolia University of Technology Hohhot 010051 China Key Laboratory of Materials Processing & Control Engineering of Inner Mongolia Autonomous Region Hohhot 010051 China

In order to improve the properties of silica sol shell for investment casting process, various contents of cattail fibers were added into the slurry to prepare a fiber-reinforced shell in the present study. The bending strength of fiber-reinforced shell was investigated and the fracture surfaces of shell specimens were observed using SEM. It is found that the bending strength increases with the increase of fiber content, and the bending strength of a green shell with 1.0 wt.% fiber addition increases by 44% compared to the fiber-free shell. The failure of specimens of the fiber-reinforced green shell results from fiber rupture and debonding between the interface of fibers and adhesive under the bending load. The micro-crack propagation in the matrix is inhibited by the micro-holes for ablation of f ibers in specimens of the f iber-reinforced shell during the stage of being fired. As a result, the bending strength of specimens of the fired shell had no significant drop. Particularly, the bending strength of specimens of the fired shell reinforced with 0.6wt.% fiber reached the maximum value of 4.6 MPa.

关键词： fiber-reinforced shell investment casting bending strength fracture surface topography

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CRISPR/Cas9-mediated metabolic engineering for enhanced PUFA production in Schizochytrium limacinum

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Chemical engineering Journal 2025年

作者： Yu Duan Limei Chen Longxue Ma Yida Zhai Yi Hu Guohua Li Guofu Chen Demao Li School of Marine Science and Technology Harbin Institute of Technology (Weihai) Weihai 264209 China School of Environment Harbin Institute of Technology Harbin 150090 China Tianjin Key Laboratory for Industrial Biological System and Bioprocessing Engineering Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences Tianjin 300308 China

The Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR)/CRISPR-associated protein (Cas) system has been successfully applied to various oil-producing microorganisms due to its high flexibility and efficiency. However, the underdeveloped genetic transformation system in Schizochytrium limacinum has hindered its broader application. To address this limitation, this study constructed a novel Agrobacterium tumefaciens -mediated screening system, which increased the transformation efficiency of S. limacinum SR21 by 77.13% through acetate-based selection. Furthermore, an endogenous Pol III promoter (tRNA Gly )-driven CRISPR/Cas9 expression system was developed, achieving gene editing in S. limacinum SR21 with an editing efficiency of 48.38%. Building on this, the established genetic transformation system was applied to metabolic engineering for DHA and EPA production in S. limacinum SR21. In response to EPA, the incomplete fatty acid synthase (FAS) pathway in S. limacinum SR21 was metabolically reassembled, realizing the de novo synthesis of EPA derived from the FAS pathway. As for DHA, the polyketide synthases (PKS) pathway in S. limacinum SR21 was strengthened by implementing a “push-pull-block” metabolic engineering strategy. Compared to the wild-type strain, the lipid content of the engineered strain increased to 77.14%, with DHA and Polyunsaturated Fatty Acid (PUFA) levels rising to 55.10% and 70.47%, respectively. In conclusion, this work provides a robust Agrobacterium tumefaciens -mediated screening system, offering a valuable reference for genetic transformation research. The developed CRISPR/Cas9 system establishes a technical foundation for advancing metabolic engineering in S. limacinum SR21. The genetically engineered SR21-ΔPEX10-ACC1-DGAT strain has the potential to produce high-purity DHA through further fermentation optimization. Additionally, the heterologous assembly of the FAS pathway provides a novel approach to co-production of the PUFA

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Master crack types and typical acoustic emission characteristics during rock failure

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International Journal of Coal Science & technology 2023年第1期10卷 73-86页

作者： Tongbin Zhao Pengfei Zhang Yaxun Xiao Weiyao Guo Yulong Zhang Xiufeng Zhang State Key Laboratory of Mining Disaster Preventionand Control Co-founded By Shandong Provinceand the Ministry of Science and Technology ShandongUniversity of Science and TechnologyQingdao 266590China College of Energy and Mining Engineering ShandongUniversity of Science and TechnologyQingdao 266590China State Key Laboratory of Geomechanics and GeotechnicalEngineering Institute of Rock and Soil MechanicsChineseAcademy of SciencesWuhan 430071China Research Center for Rock Burst Control Shandong EnergyGroup Co.Ltd.Jinan 250014China

Acoustic emission(AE)signals contain substantial information about the internal fracture characteristics of rocks and are useful for revealing the laws governing the release of energy stored *** here is the evolution of rock failure with diferent master crack types as investigated using Brazilian splitting tests(BSTs),direct shear tests(DSTs),and uniaxial compression tests(UCTs).The AE parameters and typical modes of each fracture type were obtained,and the energy release characteristics of each fracture mechanism were *** the observed changes in the AE parameters,the rock fracture process exhibits characteristics of staged *** scale and energy level of crack activity in the BSTs were signifcantly lower than those in the DSTs and *** proportion of tensile cracks in the BSTs was 65%–75%,while the proportions of shear cracks in the DSTs and UCTs were 75%–85%and 70%–75%,*** the rock loading process under diferent conditions,failure was accompanied by an increased number of shear *** amplitude,duration,and rise time of the AE signal from rock failure were larger when the failure was dominated by shear cracks rather than tensile ones,and most of the medium-and high-energy signals had medium to low *** calculating the proposed energy amplitude ratio,the energy release of shear cracks was found to exceed that of tensile cracks at the same fracture scale.

关键词： Rock failure Fracture mechanism Acoustic emission Master crack type Energy release

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Wrinkling modes of graphene oxide assembled on curved surfaces

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Nano Research 2023年第2期16卷 1801-1809页

作者： Kaiwen Li Zhanpo Han Lidan Wang Jiaqing Wang Chuanwei Zhang Jiahao Lin Shiyu Luo Li Peng Wenzhang Fang Yingjun Liu Ziliang Wu Yeqiang Tan Chao Gao Zhen Xu MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringKey Laboratory of Adsorption and Separation Materials&Technologies of Zhejiang ProvinceZhejiang UniversityHangzhou 310027China State Key Laboratory of Bio-Fibers and Eco-Textiles Collaborative Innovation Center of Marine Biobased Fiber and Ecological Textile TechnologySchool of Materials Science and EngineeringQingdao UniversityQingdao 266071China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030000China

Assembling two-dimensional(2D)sheets into macroscopic three-dimensional(3D)forms has created a promising material family with rich *** wrinkles are intrinsic features of 2D sheets in their 3D ***,the precise wrinkling modulation optimizes the transition of outstanding properties of 2D sheets to expected performances of assembled materials and dominates their fabrication *** wrinkling evolution of 2D sheets assembling onto flat surfaces has been extensively understood,however,the wrinkling behaviors on the more generally curved surface still remain ***,we investigate the wrinkling behaviors of graphene oxide sheets assembled onto curved surfaces and reveal the selection rule of wrinkling modes that determined by the curvature mismatch between 2D sheets and target *** uncover that three wrinkling modes including isotropic cracked land,labyrinth,and anisotropic curtain phases,respectively emerge on flat,spherical,and cylindrical surfaces.A favorable description paradigm is offered to quantitatively measure the complex wrinkling patterns and assess the curvature mismatch constraint underlying the wrinkling mode *** research provides a general and quantitative description framework of wrinkling modulation of 2D materials such as high performance graphene fibers,and guides the precise fabrication of particles and functional coatings.

关键词： two-dimensional(2D)sheets three-dimensional(3D)assembles curved surfaces wrinkling modes selection curvature mismatch constraint wrinkling modulation

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Automatic test of space rendezvous and docking GNC software

Automatic test of space rendezvous and docking GNC software

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2012 International Conference on Information technology and Software engineering, ITSE 2012

作者： Wang, Zhenhua Chen, Zhaohui Zhang, Guofeng Zhang, Hanxiao Beijing Institute of Control Engineering Beijing 100190 China Key Laboratory of Space Intelligent Control Technology Beijing 100190 China

ISBN: (纸本)9783642345302

The GNC for the space rendezvous and docking is a complex system. Software testing is the practical methodology to ensure the reliability and robustness of software in industrial domain. Too much effort is taken in software testing because it is extremely high that the reliability and robustness of software on GNC. This chapter proposes an automatic testing methodology towards the software of GNC for the space rendezvous and docking. There are several phases in the process of such methodology: management of test case and test scripts, automatic execution of the testing process, test data interpretation and test defect management. Practical experiments show that the proposed automatic testing methodology significantly improves the software development process efficiently. Therefore, it plays an important role in developing and validating the software on GNC. © 2013 Springer-Verlag.

关键词： Software testing

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G-CNTs/PVDF mixed matrix membranes with improved antifouling properties and filtration performance

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Frontiers of Environmental Science & engineering 2019年第6期13卷 23-33页

作者： Xiaoyan Guo Chunyu Li Chenghao Li Tingting Wei Lin Tong Huaiqi Shao Qixing Zhou Lan Wang Yuan Liao Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media PollutionTianjin Key Laboratory of Environmental Remediation and Pollution ControlCollege of Environmental Science and EngineeringNankai UniversityTianjin 300350China Sino-Canada Joint R&D Centre for Water and Environmental Safety College of Environmental Science and EngineeringNankai UniversityTianjin 300350China College of Chemical Engineering and Materials Science Tianjin University of Science&TechnologyTianjin 300457China

Although carbon nanomaterials have been widely used as effective nanofillers for fabrication of mixed matrix membranes(MMMs)with outstanding performances,the reproducibility of the fabricated MMMs is still hindered by the non-homogenous dispersion of these carbon nanofillers in membrane ***,we report an effective way to improve the compatibility of carbon-based nanomaterials with membrane *** chemically conjugating the oxidized CNTs(o-CNTs)and GO using hexanediamine as cross-linker,a novel carbon nanohybrid material(G-CNTs)was synthesized,which inherited both the advanced properties of multi-walled carbon nanotubes(CNTs)and graphene oxide(G0).The G-CNTs incorporated polyvinylidene fluoride(PVDF)MMMs(GCNTs/PVDF)were fabricated via a non-solvent induced phase separation(NIPS)*** filtration and antifouling performances of G-CNTs/PVDF were evaluated using distillate water and a1g/L bovine serum albumin(BSA)aqueous solution under 0.10 *** to the MMMs prepared with o-CNTs,GO,the physical mixture of o-CNTs and GO and pure PVDF membrane,the G-CNTs/PVDF membrane exhibited the highest water flux up to 220 L/m%and a flux recovery ratio as high as 90%,as well as the best BSA rejection *** excellent performances should be attributed to the increased membrane pore size,porosity and hydrophilicity of the resulted *** successful synthesis of the novel nanohybrid G-CNTs provides a new type of nanofillers for MMMs fabrication.

关键词： Carbon nanotubes Graphene oxide Mixed matrix membrane Nanohybrid Antifouling membrane Membrane hydrophilicity

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Corrigendum to “Fatigue behavior of 2.5D woven composites based on the first-order bending vibration tests” [Compos. Struct. 284 (2022) 115218]

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Composite Structures 2025年 352卷

作者： Yana Wang Yu Gong Qin Zhang Yuhuai He Zhanfang Liu Ning Hu Aeronautical Material Testing Research Center AECC Beijing Institute of Aeronautical Materials Beijing 100095 China Beijing Key Laboratory of Aeronautical Material Testing and Evaluation Beijing 100095 China Key Laboratory of Aeronautical Material Testing and Evaluation Aero Engine Corporation of China Beijing 100095 China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing 400044 China College of Aerospace Engineering Chongqing University Chongqing 400044 China State Key Laboratory of Automotive Simulation and Control Jilin University Changchun 130022 China School of Mechanical Engineering Hebei University of Technology Tianjin 300401 China

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The influence of nonlinear shear stress on partially averaged Navier-Stokes(PANS)method

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Journal of Hydrodynamics 2017年第3期29卷 479-484页

作者：刘锦涛郭鹏程陈铁军吴玉林 Beijing Institute of Control Engineering Beijing 100190China State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area Xi'an University of TechnologyXi'an710048China Department of Thermal Engineeering Tsinghua UniversityBeijing 100084China

In most of partially averaged Navier-Stokes（PANS）methods,the Reynolds stress is solved by a linear hypothesis isotropic *** could not capture all kinds of vortexes in *** this paper,a PANS model is modified from the RNG k-？turbulence model and is used to investigate the influence of the nonlinear shear stress on the simulation of the high pressure gradient flows and the large curvature *** are made between the result obtained by using the PANS model modified from the RNG k-？model and that obtained by using the nonlinear PANS *** flow past a curved rectangular duct is calculated by using the PANS *** obtained nonlinear shear stress agrees well with the experimental results,especially in the high pressure gradient *** calculation results show that the nonlinear PANS methods are more reliable than the linear PANS methods for the high pressure gradient flows,the large curvature flows,and they can be used to capture complex vortexes in a turbomachinary.

关键词： Nonlinear PANS method circular cylinder velocity distribution unsolved eddy viscosity

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