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| 1 | Open-loop and optimal control of cylinder wake via electromagnetic fields显示文摘The experimental and numerical investigations on electromagnetic control of cylinder wake have been performed in this paper. Experiments were conducted in a rotating annular tank filled with a low-conducting electrolyte. A cylinder with an electromagnetic actuator mounted on the surface was placed into the electrolyte. Force measurements have been carried out by strain gages attached to a fixed beam to which the hydrofoil is suspended and flow fields are visualized by dye markers. Based on the Navier-Stokes equations considering the electromagnetic body force, i.e. Lorentz force, in the ex- ponential-polar coordinates, the numerical investigations were carried out by means of an Alterna- tive-Direction Implicit algorithm and a Fast Fourier Transform algorithm. Experimental results have shown the same tendency with the numerical results. For the constant Lorentz forces, called open-loop control, the vortex shedding was fully suppressed. Meanwhile, the weak street disappeared and the drag force was reduced. Based on the Navier-Stokes equations, an adjoint-based ensemble optimiza- tion of control algorithms was developed and adjoint equations in the exponential-polar coordinates were derived. The equations were solved by numerical algorithm as mentioned above. The evolutions of the flow field in the control process were discussed according to the calculated variable optimal interaction parameters. | ZHANG Hui FAN BaoChun CHEN ZhiHua DONG Gang ZHOU BenMou | 2008 | Chinese Science Bulletin2008，53，19： | 9 |
| 2 | Effects of fibers on the mechanical properties of UHPC:A review显示文摘Ultra-high performance concrete(UHPC) developed rapidly in research and commercial use during the recent decade. Significant progress has been achieved in its material science and technology, including why and how to add discontinuous fiber reinforcement in it.This paper reviews the researches on understanding the effects of various fibers on the mechanical properties of UHPC, focus on the straight steel fibers but involving also deformed steel fibers, non-steel fibers as well as hybrid fibers. It also discusses the research methodology, prediction of mechanical properties by fiber factors, and the classification of UHPC mechanical properties related to this topic. It shows that(1) the experimental research is the main methodology for investigating the effect of the fibers on the mechanical properties of UHPC;the tensile performance of UHPC should be studied by uniaxial tensile tests and its representative indicators should include tensile strength, initial cracking strength, and peak tensile strain;(2) fiber plays an essential role in the reinforcement of the tensile strength, compressive strength, modulus of elasticity, and other material properties of UHPC, but in weakening the flowability of fresh UHPC. The positive and negative effects of fibers on the mechanical properties of UHPC should be considered,and the technology should be developed to maintain the flowability when high volume fraction of fibers is added in the UHPC;(3) the parameters of steel fibers affecting the mechanical properties of UHPC include volume fraction, size, shape, orientation and distribution, average bonding strength and minimum tensile strength, etc., which are mainly studied independently in the existing research. The studies on the combined effect of these parameters are limited but worthy of further investigation;(4) hybrid fibers could efficiently produce reinforcement effects for UHPC. It has great practical and research significance to conduct in-depth studies though the theoretical analysis and quantitative prediction are complex. | Jian Yang Baochun Chen Jiazhan Su Gang Xu Dong Zhang Jialiang Zhou | 2022 | Journal of Traffic and Transportation Engineering(English Edition)2022，9，3： | 4 |
| 3 | Adsorption of ionic liquid onto halloysite nanotubes: Mechanism and reinforcement of the modified clay to rubber显示文摘 | Guo Baochun Liu Xiaoliang Zhou Wenyou | 2010 | Journal of Macromolecular Science ( Part B ) : Physics2010，49，5： | 1 |
| 4 | Apparent polar wander path and tectonic movement of the North China Block in Phanerozoic显示文摘 | Yang Zhenyu Ma Xinghua Huang Baochun Sun Zhiming Zhou Yaoxiu | 1998 | Science in China Series D: Earth Sciences1998，，2： | 1 |
| 5 | A restudy of ostracode assemblages in the surface sediments of the Huanghai Sea显示文摘ArestudyofostracodeassemblagesinthesurfacesedimentsoftheHuanghaiSea￥ZhouBaochun;ZhaoQuanhong;HuangWeiandGaoJianxi(Departmento... | Zhou Baochun Zhao Quanhong Huang Wei and Gao Jianxi(Department of Marine and bohysics, TOngji University, Shanghai 200092, China First institute of Oceanography, State oceanic Administration, Qingdao 266071, China) | 1996 | Acta Oceanologica Sinica1996，15，2： | 0 |
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