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Design of an Indirect-Drive Pulse Shape for ~1.6 MJ Inertial Confinement Fusion Ignition Capsules

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Chinese Physics Letters 2014年第4期31卷 89-92页

作者： WANG Li-Feng WU Jun-Feng YE Wen-Hua FAN Zheng-Feng he xian-tu Institute of Applied Physics and Computational Mathematics Beijing 100094 heDPS Center for Applied Physics and Technology Peking Universir~y Beijing 100871

We present a design of indirect-drive pulse shape for inertial confinement fusion ignition capsules using laser energy 1.6 MJ with a moderate gain （~10） on the Shenguang 1V laser facility. The trade-off fuel compression （pressure） for resistance to the hydrodynamic instability （HI） in the recent high-foot （HF） implosion campaign [Dittrieh T t et al Phys. Rev. Lett. 112 （2014）055002] is recovered. The proposed design modifies the ＂main＂ pulse shape, which features a decompression-recompression step for the fuel shell resulting in higher areal density than that of the ＂simple＂ HF design, and thereby approaches the conditions required for ignition avoiding at the expense of more laser energy while holding the HI under control.

关键词： INERTIAL confinement fusion HYDRODYNAMICS DEUTERIUM TRITIUM SHOCK waves

Bursting behaviours in cascaded stimulated Brillouin scattering

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Chinese Physics B 2012年第1期21卷 310-313页

作者： Liu Zhan-Jun he xian-tu Zheng Chun-Yang Wang Yu-Gang Institute of Applied Physics and Computational Mathematics Beijing 100094China State Key Laboratory of Nuclear Physics and Technology Center for Applied Physics and TechnologyPeking UniversityBeijing 100871China

Stimulated Brillouin scattering is studied by numerically solving the Vlasov Maxwell system. A cascade of stim- ulated Brillouin scattering can occur when a linearly polarized laser pulse propagates in a plasma. It is found that a stimulated Brillouin scattering cascade can reduce the scattering and increase the transmission of light, as well as intro- duce a bursting behaviour in the evolution of the laser-plasma interaction. The bursting time in the reflectivity is found to be less than half the ion acoustic period. The ion temperature can affect the stimulated Brillouin scattering cascade, which can repeat several times at low ion temperatures and can be completely eliminated at high ion temperatures. For stimulated Brillouin scattering saturation, higher-harmonic generation and wave wave interaction of the excited ion acoustic waves can restrict the amplitude of the latter. In addition, stimulated Brillouin scattering cascade can restrict. the amplitude of the scattered light.

关键词： bursting behaviour stimulated Brillouin scattering cascade

Dipole AlfvenVortex with Finite Ion Larmor Radius in a Low-Beta Plasma

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Chinese Physics Letters 2000年第7期17卷 517-518页

作者： WANG Xu-Yu he xian-tu LIU Zhen-Xing CAO Jin-Bin Institute of Applied Physics&Computational Mathematics Beijing 100088 Laboratory of Space Weather Center for Space Science&Applied ResearchChinese Academy of SciencesBeijing 100080

A set of nonlinear fluid equations which include the effects of ion gyroradius is derived to describe Alfven vortex. The correction of finite ion gyroradius to the Alfven vortex in the inertial region is much more significant than that in the kinetic region. The amplitude of the vortex is enhanced in both regions. The scale of the vortex in the kinetic region becomes larger whereas it becomes smaller in the inertial region.

关键词： vortex Radius radius

System-size effect on the friction at liquid-solid interfaces

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Applied Mathematics and Mechanics(English Edition) 2020年第3期41卷 471-478页

作者： Liang ZHAO Jiajia SUN xian WANG Li ZENG Chunlei WANG Yusong tu College of Physical Science and Technology Yangzhou UniversityYangzhou 225009Jiangsu ProvinceChina School of Physics and Electronics Nanning Normal UniversityNanning 530023China Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201800China

The friction at the liquid-solid interfaces is widely involved in various phenomena ranging from nanometer to micrometer scales. By the molecular dynamic(MD)simulation, the friction properties of liquid-solid interfaces at the molecular level are calculated via the Green-Kubo relation. It is found that the system size will influence the value of the friction coefficient, especially for the solid surfaces with the larger polar charge. The value of the friction coefficient decreases with the increase in the system size and converges at large system sizes. The large polar charge will lead to a significant friction coefficient. However, the diffusion of water molecules on this surface is almost a constant, indicating that the diffusion coefficient seems to be independent of the system size and polar charge. This work provides insights for the selection of the system size in modeling the frictional properties of hydrophobic/hydrophilic surfaces.

关键词： Green-Kubo relation liquid-solid interface system-size effect friction coefficient

Controlling the coal dust at transshipment point: A study of the foam-sol foaming device

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International Journal of Mining Science and Technology 2014年第5期24卷 625-630页

作者： Xi Zhilin Jiang Manman Sun Changping tu xian School of Environmental Science and Safety Engineering Tianjin University of Technology Tianjin Key Laboratory for Control Theory & Application in Complicated Systems Tianjin University of Technology School of Electrical Engineering Tianjin University of Technology

In order to effectively control the dust at the transshipment point with foam-sol, this paper attempted to study the characteristics of dust diffusion at transshipment point and the foam-sol foaming device with diffusion outlet was also designed in this paper. To study the diffusion rules of coal dust, fluent discrete phase model was utilized in the numerical simulation, as the coal dust was thrown down at a horizontal velocity of 2.5 m/s. A foam-sol foaming device was designed, through which foaming agent could be automatically sucked into the Venturi by the negative pressure. The automatic controller was also equipped,which could transform the energy of the compressed air into the constant pressure difference so that the gelling agent could be qualitatively added into the gel container. The diffusion outlet that could spray out foam-sol in a continuous, conical and 3D manner was also designed. Moreover, this paper also carried out the contrast experiments on dust removal efficiency among water, aqueous foam and foam-sol. The results clearly show that the symmetrical whirlpools appeared below the inlet where the largest whirlpool diameter was 0.52 m, and the horizontal distance from swirl range to the inlet was approximately0.69 m. By using the self-designed foaming device, the foaming was multiplied by 30 times and the volume ratio with water and foaming agent reached 95%:5%. In this context, the gas pressure was controlled at 0.3 MPa, with gas flow at 15 m3/h and water flow at 0.5 m3/h, with water pressure controlled between0.34 and 0.36 MPa. The foam-sol has the highest dust removal efficiency than other agents.

关键词： Coal dust Foaming device Foam-sol Transshipment point Diffusion outlet

Numerical Simulation of Multi-Layer Penetration Process of Binder Droplet in 3DP Technique

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Computer Modeling in Engineering & Sciences 2020年第7期124卷 227-241页

作者： xiangyu Gao Weidong Yang Hongxuan xian Xiyuan tu Yuanyuang Wang School of Mechanical Engineering Hebei University of TechnologyTianjin300130China

This paper studies the binder droplet injection process in the 3DP *** mathematical model of the binder penetration process for multi-nozzle and multi-layer in 3DP technique is established,by using the conservation Level set *** to the two-dimensional plane model of three-dimensional spatial structure of sand bed,the construction method of an equivalent cylindrical mapping infiltration model is proposed to represent the porosity of the model in the two-dimensional plane,which is exactly the same as that in the three-dimensional space,as well as closer to the arrangement of the three-dimensional space,and to realize the differentiation between the pores and the *** method of spraying droplets alternately by multiple nozzles simulates the staggered arrangement of multiple array-type nozzles and prints the current layer completely at one *** numerical simulation of multi-layer penetration process is realized by using the method of continuous *** simulation model of the binder penetration process by using multi-nozzle and multi-layer is established to simulate the whole process of the binder from the nozzle to impacting on the sand bed and then to penetrating into the sand bed,which reflects the complete penetration process and predicts the sand agglomeration.

关键词： Additive manufacturing binder penetration numerical simulation

Schisandrin B Inhibits NLRP3 Inflammasome Pathway and Attenuates Early Brain Injury in Rats of Subarachnoid hemorrhage

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Chinese Journal of Integrative Medicine 2022年第7期28卷 594-602页

作者： CheN Song DING Yi-hang SHI Song-sheng tu xian-kun Department of Neurosurgery Fujian Medical University Union HospitalNeurosurgery Research Institute of Fujian ProvinceFuzhou 350001China

Objective: To determine whether Schisandrin B(Sch B) attenuates early brain injury(EBI) in rats with subarachnoid hemorrhage(SAH). Methods: Sprague-Dawley rats were divided into sham(sham operation), SAH, SAH+vehicle, and SAH+Sch B groups using a random number table. Rats underwent SAH by endovascular perforation and received Sch B(100 mg/kg) or normal saline after 2 and 12 h of SAH. SAH grading, neurological scores, brain water content, Evan’s blue extravasation, and terminal transferase-mediated dUTP nick end-labeling(tuNEL) staining were carried out 24 h after SAH. Immunofluorescent staining was performed to detect the expressions of ionized calcium binding adapter molecule 1(Iba-1) and myeloperoxidase(MPO) in the rat brain, while the expressions of B-cell lymphoma 2(Bcl-2), Bax, Caspase-3, nucleotide-binding oligomerization domain-like receptor family pyrin domain-containing 3(NLRP3), apoptosis-associated specklike protein containing the caspase-1 activator domain(ASC), Caspase-1, interleukin(IL)-1β, and IL-18 in the rat brains were detected by Western blot. Results: Compared with the SAH group, Sch B significantly improved the neurological function, reduced brain water content, Evan’s blue content, and apoptotic cells number in the brain of rats(Phe elevated expressions of Bax, Caspase-3, NLRP3, ASC, Caspase-1, IL-1β, and IL-18 in the rat brain(Phe Bcl-2 expression(Phe inhibition of neuroinflammation, neuronal apoptosis, and the NLRP3 inflammatory signaling pathway.

关键词： schisandrin B subarachnoid hemorrhage early brain injury inflammation neuronal apoptosis nucleotide-binding oligomerization domain-like receptor family pyrin domain-containing 3 Chinese medicine

A High-Ductility Mg–Zn–Ca Magnesium Alloy

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Acta Metallurgica Sinica(English Letters) 2019年第1期32卷 23-30页

作者： Teng tu xian-Hua Chen Jiao Chen Chao-Yue Zhao Fu-Sheng Pan College of Materials Science and Engineering Chongqing University National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing Academy of Science and Technology

A new kind of Mg–2 Zn–0.6 Ca(wt%) alloy was fabricated by casting and hot extrusion as a high-ductility structural material. The extruded alloy exhibits a superior elongation of ～30%, yield strength of 130 MPa and ultimate tensile strength of 280 MPa along the extrusion direction at room temperature. Microstructure, texture and tensile properties of the extruded alloy were investigated in details. The remarkable improvement of ductility is ascribed to the weakened basal texture, refined grains and a small number of second phase in the alloy.

关键词： Magnesium alloy Mg–Zn–Ca High ductility Extrusion Texture

A novel hole cold-expansion method and its effect on surface integrity of nickel-based superalloy

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Journal of Materials Science & Technology 2020年第24期59卷 129-137页

作者： xianCao Ping ZhangShuang Liu Xue-Lin Lei Run-Zi Wang xian-Cheng Zhang Shan-tung tu Key Laboratory of Pressure Systems and Safety Ministry of EducationSchool of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China

Preferred surface integrity around the hole wall is one of the key parameters to ensure the optimized performance of hole components for nickel-based *** novel hole cold expansion technique introduced in this work involves the laser texturing process(LTP)followed by the hertz contact rotary expansion process(HCREP),where the cylindrical sleeve is the critical component connecting the abovementioned two *** purpose of LTP is to obtain the most optimized strengthened cylindrical sleeve surface,preparing for the following ***,the HCREP acts on the nickel-based hole components by the rotary extruding movements of the strengthened sleeve and conical mandrel *** compared to the as-received GH4169 material,the surface integrity characterization for the strengthened hole shows that a plastic deformation layer with finer grains,higher micro-hardness,deeper compressive residual stress(CRS)distribution and lower surface roughness is formed at the hole *** addition,transmission electron microscope(TEM)observations reveal the microstructure evolution mechanism in the strengthened *** refinement near the hole wall is regarded as the fundamental reason for improving the surface integrity,where the aggregated dislocations and recombined dislocation walls can be clearly observed.

关键词： Cold expansion process Laser texturing process Surface integrity Microstructure evolution