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MDA-JITL model for on-line mechanical property prediction

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Journal of Iron and Steel Research International 2023年第3期30卷 504-515页

作者： Fei-fei Li An-rui He yong Song Xiao-qing xu Shi-wei Zhang Yi qiang Chao Liu National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing 100083China China Academy of Machinery Science and Technology Beijing 100044China

Mechanical performance prediction is the key to the transformation and upgrading of steel enterprises to intelligent *** to time-varying manufacturing data,the traditional prediction model of mechanical properties of hotrolled strip may cause performance degradation or even failure in its *** MDA-JITL model was thus proposed to handle the modeling problem of complex time-varying *** parameters were first chosen and ***,a distance measurement method combining the importance of data attributes and time characteristics was designed to select the most suitable samples for on-line local *** that,using the chosen dataset,a linear local model was created to predict target ***,an uncertainty evaluation method was designed to evaluate the uncertainty of prediction ***,the appropriate dataset partition and off-line simulation experiment scheme were created based on the peculiarities of hot-rolling *** suggested model performs much better than the classic global model when applied to actual production data from a steel *** stability of its prediction accuracy is demonstrated in a simulation prediction for up to five ***,there is a high link between the uncertainty evaluation metrics and the prediction error of the model,reducing the field sampling rate by 30%in industrial applications in the latest year.

关键词： JITL Feature weighting Rolling training Prediction Mechanical property

Single color image super-resolution using sparse representation and color constraint

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Journal of Systems Engineering and Electronics 2020年第2期31卷 266-271页

作者： xu Zhigang MA qiang YUAN Feixiang School of Computer and Communication Lanzhou University of TechnologyLanzhou 730050China

Color image super-resolution reconstruction based on the sparse representation model usually adopts the regularization norm(e.g.,L1 or L2).These methods have limited ability to keep image texture detail to some extent and are easy to cause the problem of blurring details and color artifacts in color reconstructed *** paper presents a color super-resolution reconstruction method combining the L2/3 sparse regularization model with color channel *** method converts the low-resolution color image from RGB to *** L2/3 sparse regularization model is designed to reconstruct the brightness channel of the input low-resolution color *** the color channel-constraint method is adopted to remove artifacts of the reconstructed highresolution *** method not only ensures the reconstruction quality of the color image details,but also improves the removal ability of color *** experimental results on natural images validate that our method has improved both subjective and objective evaluation.

关键词： color image sparse representation super-resolution L2/3 regularization norm color channel constraint

Disruption of egg-specific protein causes female sterility in Bombyx mori

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Insect Science 2022年第1期29卷 128-138页

作者： Xia xu Yao-Hui Wang Zu-Lian Liu yong-qiang Wang Lin He Kai Li yong-Ping Huang Institute of Sericulture and Tea Research Zhejiang Academy of Agricultural SciencesHangzhou310021China Key Laboratory of Insect Developmental and Evolutionary Biology CAS Center for Excellence in Molecular Plant SciencesShanghai Institute of Plant Physiology and EcologyChinese Academy of SciencesShanghai200032China School of Life Science East China Normal UniversityShanghai200062China

Yolk proteins are the main source of nutrients during embryonic and early larval development in oviparous animals. Therefore, vitellogenesis is crucial for reproduction. The silkworm, Bombyx mori, is a model lepidopteran insect in which there are three yolk proteins: vitellin, 30-kDa protein, and egg-specific protein (Esp). In this study, we explored the gene function of Esp through transgenic clustered regularly interspaced palindromic repeats (CRISPR) / CRISPR-associated protein 9 technology-mediated mutations in the silkworm. We found that Esp mutation resulted in female sterility but had no effect on male fertility. Female mutants could lay eggs after mating, but the eggs were smaller and lighter colored than those laid by wild-type females. The most important finding is that the eggs laid by female mutants did not hatch. Furthermore, we observed stable inheritance of female sterility caused by Esp mutation through successive generations. Thus, Esp encodes a yolk protein that is crucial for female reproductive success and is a potential target for pest control.

关键词： Bombyx mori CRISPR/Cas9 Esp female sterility

Model Based Adaptive Control and Disturbance Compensation for Underwater Vehicles

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Chinese Journal of Mechanical Engineering 2018年第1期31卷 114-126页

作者： Hai Huang Guo-Cheng Zhang Ji-yong Li qiang Zhang Jin-Yu xu Hong-De Qin National Key Laboratory of Science and Technology on Autonomous Underwater Vehicle Harbin Engineering University

Underwater vehicles are being emphasized as highly integrated and intelligent devices for a significant number of oceanic operations. However, their precise operation is usually hindered by disturbances from a tether or manipulator because their propellers are unable to realize a stable suspension. A dynamic multi-body model-based adaptive controller was designed to allow the controller of the vehicle to observe and compensate for disturbances from a tether or manipulator. Disturbances, including those from a tether or manipulator, are deduced for the observation of the controller. An analysis of a tether disturbance covers the conditions of the surface, the underwater area, and the vehicle end point. Interactions between the vehicle and manipulator are mainly composed of coupling forces and restoring *** verify the robustness of the controller, path-following experiments on a streamlined autonomous underwater vehicle experiencing various disturbances were conducted in Song Hua Lake in China. Furthermore,path-following experiments for a tethered open frame remote operated vehicle were verified for accurate cruising with a controller and an observer, and vehicle and manipulator coordinate motion control during the simulation and experiments verified the effectiveness of the controller and observer for underwater operation. This study provides instructions for the control of an underwater vehicle experiencing disturbances from a tether or manipulator.

关键词： Underwater vehicle Adaptive control Disturbance observer Multi-body dynamic model

Topological gapless matters in three-dimensional ultracold atomic gases

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Frontiers of physics 2019年第4期14卷 21-46页

作者： yong xu Center for Quantum Information IIIS Tsinghua University Beijing 100084 China

Three-dimensional topological gapless matters with gapless degeneracies protected by a topological invariant defined over a closed manifold in momentum space have attracted considerable interest in various fields ranging from condensed matter materials to ultracold atomic gases. As a highly controllable and disorder free system, ultracold atomic gases provide a versatile platform to simulate topological gapless matters. Here, the current progress in studies of topological gapless phenomena in three-dimensional cold atom systems is summarized in the review. It is mainly focused on Weyl points, structured (type-Ⅱ) Weyl points, Dirac points, nodal rings and Weyl exceptional rings in cold atoms. Since interactions in cold atoms can be controlled via Feshbach resonances, the progress in both superfluids for attractive interactions and non-interacting cold atom gases is reviewed.

关键词： ultracold atomic gases Weyl points Dirac points nodal rings Weyl exceptional rings

Quasi-MOF-immobilized metal nanoparticles for synergistic catalysis

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Science China Chemistry 2020年第11期63卷 1601-1607页

作者： Liyu Chen Nobuko Tsumori qiang xu AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory(ChEM-OIL) National Institute of Advanced Industrial Science and Technology(AIST)YoshidaSakyo-kuKyoto 606-8501Japan Toyama National College of Technology 13 Hongo-machiToyama 939-8630Japan School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China

Through partial deligandation of metal-organic frameworks(MOFs),quasi-MOFs with a transition structure between MOFs and metal compounds(such as metal oxides,nitrides,sulfides,and phosphides)can be ***-MOFs can not only retain the porous structure of MOFs to a certain extent,but also expose the inorganic nodes to the guest species(e.g.,metal nanoparticles)to show enhanced metal-support interaction for synergistic *** concept was first demonstrated by our group through calcining Au/MIL-101 at different temperatures under Ar flow to adjust the interface between Au nanoparticles and the inorganic Cr–O *** obtained Au/quasi-MIL-101 showed superior enhanced catalytic activity in the oxidation of carbon *** study has inspired further research interest to fabricate other quasi-MOFs through controlled deligandation of mono-and bimetallic MOFs and their composites for the design of efficient catalysts.

关键词： MOFs metal nanoparticles metal-support interaction quasi-MOFs synergistic catalysis

Homotopy Coiflets wavelet solution of electrohydrodynamic flows in a circular cylindrical conduit

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Applied Mathematics and Mechanics(English Edition) 2020年第5期41卷 681-698页

作者： Anyang WANG Hang xu qiang YU State Key Lab of Ocean Engineering School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China College of Ocean Science and Engineering Shanghai Maritime UniversityShanghai 201306China

In previous studies, the nonlinear problem of electrohydrodynamic(EHD)ion drag flows in a circular cylindrical conduit has been studied by several authors. However, those studies seldom involve the computation for large physical parameters such as the electrical Hartmann number and the magnitude parameter for the strength of the nonlinearity due to the existence of strong nonlinearity in these extreme cases. To overcome this faultiness, the newly-developed homotopy Coiflets wavelet method is extended to solve this EHD flow problem with strong nonlinearity. The validity and reliability of the proposed technique are verified. Particularly, the highly accurate homotopy-wavelet solution is obtained for extreme large parameters, which seems to be overlooked *** about the effects of related physical parameters on the axial velocity field is presented.

关键词： homotopy-wavelet method Coiflets electrohydrodynamic(EHD)flow nonlinear boundary value problem(BVP)

Exploring the Predominant Factors Influencing the Oxygen Reduction Performance of PtCo/C Catalysts

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Chemical Research in Chinese Universities 2024年第4期40卷 753-760页

作者： LI Jinrong YU Xianghui SUN Qi PENG yong CAO Shuang HOU Chun-Chao xu qiang College of Chemistry and Chemical Engineering Institute for Sustainable Energy and ResourcesQingdao UniversityQingdao266071P.R.China Leibniz Institute for Catalysis e.V. Albert-Einstein-Strasse 29aRostock18059Germany School of Materials Science and Engineering Ocean University of ChinaQingdao266100P.R.China Shenzhen Key Laboratory of Micro/Nano-Porous Functional Materials(SKLPM) SUSTech-Kyoto University Advanced Energy Materials Joint Innovation Laboratory(SKAEM-JIL)Key University Laboratory of Highly Efficient Utilization of Solar Energy and Sustainable Development of GuangdongDepartment of Chemistry and Department of Materials Science and EngineeringSouthern University of Science and Technology(SUSTech)Shenzhen518055P.R.China

PtCo nanoalloys(NAs)deposited on carbon black are emerging as robust electrocatalysts for addressing the sluggish kinetic issue of oxygen reduction reaction(ORR).However,developing a simple and low-cost method to synthesize PtCo/C with excellent performance is still a great *** this work,a one-pot method was used to successfully obtain the PtCo NAs on commercial carbon supports of acetylene black and Ketjenblack ECP600JD,*** with those grown on Ketjenblack ECP600JD,the PtCo NAs grown on acetylene black exhibited higher electrochemical surface area(ECSA)and mass activity(MA),which may be attributed to the different particle sizes of PtCo NAs,distinct hydrophilicity,electroconductivity and charge distribution between the carbon supports and PtCo *** study provides valuable insights into the optimal design of carbon-supported ORR electrocatalysts with exceptional activity and durability.

关键词： Oxygen reduction reaction PtCo nanoalloy Carbon-supported nanostructure Acetylene black

Function spaces on local fields

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Science China Mathematics 2006年第1期49卷 66-74页

作者： SU Weiyi xu qiang Department of Mathematics Nanjing University Nanjing 210093 China Department of Mathematics Nanjing University Nanjing 210093 China

We study the function spaces on local fields in this paper, such as Triebel Btype and F-type spaces, Holder type spaces, Sobolev type spaces, and so on, moreover,study the relationship between the p-type derivatives and the Holder type spaces. Our obtained results show that there exists quite difference between the functions defined on Euclidean spaces and local fields, respectively. Furthermore, many properties of functions defined on local fields motivate the new idea of solving some important topics on fractal analysis.

关键词： local Held character group Triebel B-type and F-type spaces Holder type space.