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Roll Subsectional Cooling Adaptive Fuzzy Control Based on Fuzzy Model Inversion

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Journal of Iron and Steel Research International 2010年第4期17卷 39-44页

作者： SHAN xiu-ying liu Hong-min JIA Chun-yu Engineering Research Center of Rolling Equipment and Complete Technology of Ministry of Education State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 Hebei China

Flatness is an important equality indicator of strip rolling and roll subsectional cooling is an important method for flatness control, especially for high order flatness component control. It is very hard to build the mathematic model of roll subsectional cooling because of its characteristics of nonlinearity, hysteresis quality and strong coupling, etc. In order to improve the control effect of roll subsectional cooling control model, the roll subsectional cooling adaptive fuzzy control model based on fuzzy model inversion is built according to the separation principle of fuzzy form on the basis of the conventional fuzzy control model, where the parameters of the fuzzy controller can be dynamically regulated according to the change of rolling conditions. Simulation experiment results of the model indicate that the proposed roll subsectional cooling adaptive fuzzy control model based on fuzzy model inversion has high control precision and rapid response speed with strong self-learning and anti-interference capacity and a new method is provided for high precision flatness control.

关键词： fuzzy identification subsectional cooling adaptive fuzzy control flatness control

Cloning of a Vacuolar H^+-pyrophosphatase Gene from the Halophyte Suaeda corniculata whose Heterologous Overexpression Improves Salt,Saline-alkali and Drought Tolerance in Arabidopsis

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Journal of Integrative Plant Biology 2011年第9期53卷 731-742页

作者： Liang liu Ying Wang Nan Wang Yuan-Yuan Dong xiu-Duo Fan xiu-Ming liu Jing Yang Hai-Yan Li Ministry of Education Engineering Research Center of Bioreactor and Pharmaceutical Development Jilin Agricultural UniversityChangchun 130118China College of Life Sciences Jilin Agricultural UniversityChangchun 130118China

Salt,saline-alkali conditions,and drought are major environmental factors limiting plant growth and *** vacuolar H＋-translocating inorganic pyrophosphatase（V-H＋-PPase） is an electrogenic proton pump that translocates protons into vacuoles in plant *** of V-H＋-PPase increases in plants under a number of abiotic stresses,and is thought to have an important role in adaptation to abiotic *** this work,we report the isolation and characterization of the gene,ScVP,encoding a vacuolar inorganic pyrophosphatase（V-H＋-PPase） from the halophyte,Suaeda *** reverse transcription-polymerase chain reaction analysis showed that ScVP was induced in roots,stems and leaves under treatment with salt,saline-alkali and *** with wild-type（WT） Arabidopsis,transgenic plants overexpressing ScVP accumulated more Na＋ in leaves and roots,and showed increased tolerance to high salinity,saline-alkali and drought *** germination percentage of transgenic Arabidopsis seeds was higher than that of WT seeds under the abiotic *** root length of transgenic plants under salt stress was longer than that of WT ***,the rate of water loss during drought stress was higher in WT than in transgenic ***,these results indicate that ScVP plays an important role in plant tolerance to salt,saline-alkali and drought stress.

关键词： drought H^+-pyrophosphatase salt saline-alkali Suaeda corniculata.

Plants of Leptostrobus Heer （Czekanowskiales） from the Early Cretaceous and Late Triassic of China, with Discussion of the Genus

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Journal of Integrative Plant Biology 2006年第2期48卷 137-147页

作者： xiu-Qun liu Cheng-Sen Li Yu-Fei Wang Laboratory of Systematic and Evolutionary Botany Institute of Botany the Chinese Academy of Sciences Beijing 100093 China

Investigation of the Mesozoic seed plant Leptostrobus Heer from the Yangcaogou Formation of the Late Triassic and the Yixian Formation of the Early Cretaceous, Liaoning Province, China, provides new Insight Into Its general morphology and geographical distribution. The materials of L. cancer from the Yixian Formation described herein are later than all the past findings of this species and add to the record of L. cancer during the Early Cretaceous. Based on well-preserved specimens, the specific diagnosis Is slightly emended and the reconstructlon of L. cancer Is perfected. The materials from the Yangcaogou Formation of the Late Triassic are placed in L. spheericus, in addition, we review the history of investigation of the genus Leptostrobus since its establishment in 1876 and discuss the main characteristics of each species.

关键词： Early Cretaceous Late Triassic Leptostrobus Yangcaogou Formation Yixian Formation.

Multipolar Structure of Equilibrium Shear Flow Field in Toroidal Plasmas

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Communications in Theoretical Physics 2019年第1期71卷 91-96页

作者： liu-xiu He Ming-Hai liu Hua-Kun Cai School of Physics Huazhong University of Science and Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electric Engineering Huazhong University of Science and Technology

The multipolar velocity field structures are investigated by 2D momentum conservation equation with 3D equilibrium sheared flows in the full toroidal system. Numerical results show that the non-existence of radial velocity field in equilibrium surfaces is suitable only for the zero-order term of our 2D simulation. The non-zero-order radial velocity field is still preserved, even when converted to conventional magnetic surface coordinates. The distribution of velocity field vectors of the order of 1, 2, and 3 are presented respectively in 2, 4, and 6 polar fields with the local vortex structure. The excitation mechanisms of these velocity vortices are the coupling effects of the magneto-fluid structure patterns and the toroidal effects. These results can help us understand the complexity of core physics, the transverse transport across magnetic field by the radial plasma flow and the formation of velocity vortices.

关键词： equilibrium shear flow multipolar field vortex structure

Experimental study on a -60 °C cascade refrigerator with dual running mode

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第5期13卷 375-381页

作者： xiu-fang liu Jiong-hui liu Hong-li ZHAO Qiao-yu ZHANG Juan-li MA Institute of Refrigeration and Cryogenic Engineering Xi'an Jiaotong University Xi 'an 710049 China School of Mechanical and Power Engineering Henan Polytechnic University Jiaozuo 454000 China

In this study,an experimental setup is designed and built to investigate the feasibility and performance of the proposed dual-mode cascade refrigeration *** apparatus can be operated in two modes:dual-stage mode and single-stage mode such that the low temperature cycle(LTC) can be operated together with the high temperature cycle(HTC) or can run *** results validate the feasibility of independent operation of *** performance of the independent operation of LTC mode is theoretically investigated using experimental data as *** suggestions are made for the improvement of the coefficient of performance(COP) of the experimental ***,high COP of the cycle provides excellent application for the presented refrigeration cycle.

关键词： Cascade refrigeration Dual-mode Regenerator Optimization Effectiveness

A spherical parameterization approach based on symmetry analysis of triangular meshes

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第7期10卷 1009-1017页

作者： Jian-ping HU xiu-ping liu Zhi-xun SU Xi-quan SHI Feng-shan liu School of Mathematical Sciences Dalian University of Technology Dalian 116024 China Department of Applied Mathematics and Theoretical Physics Delaware State University Dover DE 19901 USA

We present an efficient spherical parameterization approach aimed at simultaneously reducing area and angle dis-tortions. We generate the final spherical mapping by independently establishing two hemisphere parameterizations. The essence of the approach is to reduce spherical parameterization to a planar problem using symmetry analysis of 3D meshes. Experiments and comparisons were undertaken with various non-trivial 3D models, which revealed that our approach is efficient and robust. In particular, our method produces almost isometric parameterizations for the objects close to the sphere.

关键词： Triangular mesh Spherical parameterization Symmetry analysis

Asymptotic Speed of Wave Propagation for A Discrete Reaction-Diffusion Equation

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Acta Mathematicae Applicatae Sinica 2006年第3期22卷 369-386页

作者： xiu-xiang liu Pei-xuan Weng School of Mathematics Science South China Normal University Guangzhou 510631 China

We deal with asymptotic speed of wave propagation for a discrete reactlon-diffusion equation. We find the minimal wave speed c★ from the characteristic equation and show that c★ is just the asymptotic speed of wave propagation. The isotropic property and the existence of solution of the initial value problem for the given equation are also discussed.

关键词： Discrete reaction-diffusion equation travelling wave solutions monotone iteration asymptotic speed of wave propagation isotropic property

Helium-Implanted Optical Planar Waveguides in Nd^(3+)-Doped Phosphate Glass

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Chinese Physics Letters 2011年第11期28卷 117-120页

作者： liu Chun-Xiao liu Tao liu xiu-Hong WEI Wei PENG Bo State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119 School of Physics Shandong UniversityJinan 250100 Graduate School of the Chinese Academy of Sciences Beijing 100049

We report the fabrication of planar waveguides in Nd^(3+)-doped phosphate glass by helium ion *** guiding properties of the waveguide are evaluated by a prism coupler and end-face coupling *** refractive index profile of the waveguide is reconstructed by using the intensity calculation *** and fluorescence investigations reveal that helium ion implantation causes only slight changes in the optical properties,suggesting the possible application of the fabricated structures as waveguide lasers.

关键词： waveguide implantation refractive

Linear Integral Analysis of Bar Rough Rolling by Strain Rate Vector

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Journal of Iron and Steel Research International 2010年第3期17卷 28-33页

作者： DENG Wei ZHAO De-wen QIN Xiao-mei GAO xiu-hua DU Lin-xiu liu Xiang-hua State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

A new linear integral method for bar hot rolling on roughing train was obtained. First, for plastic deformation energy rate, equivalent strain rate about Kobayashi＇s three-dimensional velocity field was expressed by two-dimensional strain rate vector; then, the two-dimensional strain rate vector was inverted into inner product and was integrated term by term. During those processes, boundary equation and mean value theorem were introduced; for friction and shear energy dissipation rate, definite integral was applied to the solution process. Sequentially, the total upper bound power was minimized, and the analytical expressions of rolling torque, separating force, and stress state factor were obtained. The calculated results by these expressions were compared with those of experimental values. The results show that the new linear integral method is available for bar rough rolling analysis and the calculated results by this method are a little higher than those of experimental ones. However, the maximum error between them is less than 10%.

关键词： bar rough rolling linear integration strain rate vector roll separating force