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Surgical Technique for Reconstruction of Diaphyseal Defect with Endoprosthesis following Intercalary Resection in Femoral Shaft

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中华骨科杂志 2015年第3期35卷 I0010-I0012页

作者： yong-cheng Hu Department of Bone Oncology Tianfin Hospital Tianfin China

IntroductionThe options for reconstruction of diaphyseal skeletal defects after excision of bone tumors in the shaft of long bones include the use of autogenous vascularized fibular grafts1,autogenous extracorporeally inactivated bone2,massive allografts3,a combination of autogenous fibular grafts and allografts4,5 and intercalary endoprostheses6-8.

关键词：摘要编辑部编辑工作读者作者

Hydrodynamic Performance of A Dual-Floater Integrated System Com-bining Hybrid WECs and Floating Breakwaters

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China Ocean Engineering 2022年第6期36卷 969-979页

作者： FU Lei cheng yong School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China

The high investment and low return of wave energy converters(WECs)seriously hamper their large-scale commercial *** integration of WECs and floating breakwaters is conducive to enhance the competitiveness of wave energy *** objective of this paper is to investigate the hydrodynamic performance of a WEC-breakwater integrated system combining an upstream oscillating water column(OWC)and a downstream oscillating buoy(OB)via numerical simulations and physical experiments.A nonlinear numerical wave flume using Star-CCM+software is employed to obtain calculated results,where a tiny transverse gap is set between the flume wall and the block surface to simulate a similar two-dimensional(2D)*** corresponding physical experiments are also carried out in a practical wave flume to verified the numerical *** comparison of the isolated and hybrid system shows that the hybrid design leads to the decreased conversion efficiency of each WEC,but improves the transmission performance of the hybrid *** wave resonance between two devices causes the abrupt reduction of OWC efficiency and a positive correlation exists with the OB *** total efficiency of the hybrid system is raised by an optimal opening ratio,a shallow OWC draft and a short spacing *** for the OWC draft,other design parameters have weak effect on the wave attenuation of the hybrid *** paper can help understand hydrodynamics of the hybrid WECs integrated with breakwaters and improve their performances.

关键词： wave energy converters floating breakwater oscillating buoy oscillating water column numerical wave flume physical experiment

Weyl Representation of the Space-Time of the Vacuum C Metric when m =0

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Chinese Physics Letters 1996年第7期13卷 489-491页

作者： WANG yong-cheng Department of Physics Beijing Normal UniversityBeijing 100875

By using the imaginary Weyl coordinate method,the whole space-time of the vacuum C metric when m=0 can be represented by the Weyl coordinate *** addition,a revised transformation relation between Weyl and Minkowski coordinates has been introduced,and the whole space-time obtained by the Minkowski form of the metric can also be represented by Weyl coordinate system.

关键词： coordinate Minkowski Weyl

（Co）Homology and Universal Central Extension of Hom-Leibniz Algebras

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Acta Mathematica Sinica,English Series 2011年第5期27卷 813-830页

作者： yong Sheng cheng Institute of Contemporary Mathematics & College of Mathematics and Information Science He'nan University Kaifeng 475004 P. R. China Wu Wen- Tsun Key Laboratory of Mathematics University of Science and Technology of China Hefei 230026 P. R. China Department of Mathematics Tongji University Shanghai 200092 P. R. China

Hom-Leibniz algebra is a natural generalization of Leibniz algebras and Hom-Lie algebras. In this paper, we develop some structure theory （such as （co）homology groups, universal central extensions） of Hom-Leibniz ... 详细信息

关键词： Hom-Leibniz algebra (co)homology theory central extension

Time-Domain Higher-Order Boundary Element Method for Simulating High Forward-Speed Ship Motions in Waves

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China Ocean Engineering 2024年第5期38卷 904-914页

作者： ZHOU Xiao-guo cheng yong PAN Su-yong School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China

The hydrodynamic performance of a high forward-speed ship in obliquely propagating waves is numerically examined to assess both free motions and wave field in comparison with a low forward-speed *** numerical model is based on the time-domain potential flow theory and higher-order boundary element method,where an analytical expression is completely expanded to determine the base-unsteady coupling flow imposed on the moving condition of the *** ship in the numerical model may possess different advancing speeds,***,low speed,and high *** role of the water depth,wave height,wave period,and incident wave angle is analyzed by means of the accurate numerical *** is found that the resonant motions of the high forward-speed ship are triggered by comparison with the stationary *** specifically,a higher forward speed generates a V-shaped wave region with a larger elevation,which induces stronger resonant motions corresponding to larger wave *** shoaling effect is adverse to the motion of the low-speed ship,but is beneficial to the resonant motion of the high-speed *** waves obliquely propagate toward the ship,the V-shaped wave region would be broken due to the coupling effect between roll and pitch *** is also demonstrated that the maximum heave motion occurs in beam seas for stationary cases but occurs in head waves for high ***,the variation of the pitch motion with period is hardly affected by wave incident angles.

关键词： high forward speed oblique incident waves ship motion higher-order boundary element method time domain wave field

Metric of the Superposition of a Schwarzschild Black Hole and a Semi-infinite Rod:Vacuum C Metric

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Chinese Physics Letters 1997年第12期14卷 881-884页

作者： WANG yong-cheng Department of Physics Beijing Normal UniversityBeijing 100875

By using a coordinate origin translation and a scale transformation,of which both are constants,the metric of the superposition of a Schwarzschild black hole(SBH)and a semi-infinite rod(SIR)is transformed to the standard form of a vacuum C metric(VCM)in Weyl coordinate system,and for this reason the metric is a VCM *** of mass and acceleration parameters in the VCM are *** expressions show,as a result of the superposition,both the mass of the SBH and the acceleration parameter of the SIR take very great and complex changes.

关键词： infinite coordinate acceleration

Entanglement wedge cross-section with Gauss-Bonnet corrections and thermal quench

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Science China(Physics,Mechanics & Astronomy) 2021年第12期64卷 90-103页

作者： yong-Zhuang Li cheng-yong Zhang Xiao-Mei Kuang School of Science Jiangsu University of Science and TechnologyZhenjiang 212003China Department of Physics and Siyuan Laboratory Jinan UniversityGuangzhou 510632China Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China

The entanglement wedge cross section(EWCS) is numerically investigated statically and dynamically in a five-dimension Ad SVaidya spacetime with Gauss-Bonnet(GB) corrections, focusing on two identical rectangular strips on the boundary. In the static case, EWCS increases as the GB coupling constant α increases and disentangles at small separation between two strips for smaller α. For the dynamic case, such a monotonic relationship between EWCS and α holds but the two strips no longer disentangle monotonically as in the static case. In the early thermal quenching stage, the disentanglement occurs at smaller αwith larger separations. Two strips then disentangle at larger separation with larger α as time evolves. Our results indicate that the higher-order derivative corrections, like the entanglement measure in the dual boundary theory, also have nontrivial effects on the EWCS evolution.

关键词： Ad S/CFT correspondence holographic entanglement entropy Gauss-Bonnet gravity entanglement wedge cross section

SIMULATION OF HYDRAULIC TRANSIENTS IN HYDROPOWER SYSTEMS USING THE 1-D-3-D COUPLING APPROACH

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Journal of Hydrodynamics 2012年第4期24卷 595-604页

作者： ZHANG Xiao-xi cheng yong-guang State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China

Although the hydraulic transients in pipe systems are usually simulated by using a one-dimensional （l-D） approach, local three-dimensional （3-D） simulations are necessary because of obvious 3-D flow features in some local regions of the hydropower systems. This paper combines the 1-D method with a 3-D fluid flow model to simulate the Multi-Dimensional （MD） hydraulic transients in hydropower systems and proposes two methods for modeling the compressible water with the correct wave speed, and two strategies for efficiently coupling the 1-D and 3-D computational domains. The methods are validated by simulating the water hammer waves and the oscillations of the water level in a surge tank, and comparing the results ~with the 1-D solution data. An MD study is conducted for the transient flows in a realistic water conveying system that consists of a draft tube, a tailrace surge tank and a tailrace tunnel. It is shown that the 1-D-3-D coupling approach is an efficient and promising way to simulate the hydraulic transients in the hydropower systems in which the interactions between 1-D hydraulic fluctuations of the pipeline systems and the local 3-D flow patterns should be considered.

关键词： hydropower station hydraulic transients compressible water model coupling of 1-D and 3-D methods

Out-of-time-order correlators in the one-dimensional XY model

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Communications in Theoretical Physics 2020年第8期72卷 69-78页

作者： Jia-Hui Bao cheng-yong Zhang Department of Physics and Siyuan Laboratory Jinan UniversityGuangzhou 510632China School of Physics and Astronomy Sun Yat-sen University2 Daxue Rd.Zhuhai 519082China

We study the behavior of information spreading in the XY model, using out-of-time-order correlators(OTOCs). The effects of anisotropic parameter γ and external magnetic field λon OTOCs are studied in detail within thermodynamical limits. The universal form which characterizes the wavefront of information spreading still holds in the XY model. The butterfly speed vBdepends on(γ, λ). At a fixed location, the early-time evolution behavior of OTOCs agrees with the results of the Hausdorff–Baker–Campbell expansion. For long-time evolution,OTOCs with local operators decay as for power law t^-1, but those with nonlocal operators show different and nontrivial power law behaviors. We also observe temperature dependence for OTOCs when(γ=0, λ=1). At low temperature, the OTOCs with nonlocal operators show divergence over time.

关键词： out-of-time-order correlators information spreading integrable model