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Benchmark simulations of radiative transfer in participating binary stochastic mixtures in two dimensions

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Matter and Radiation at Extremes 2024年第6期9卷 81-93页

作者： Cong-Zhang Gao Ying Cai Jian-Wei Yin Zheng-Feng Fan Pei Wang shao-ping zhu Cheng-Wu Huang Yang Zhao Jia-Min Yang Institute of Applied Physics and Computational Mathematics Beijing 100088People’s Republic of China Laser Fusion Research Center China Academy of Engineering PhysicsMianyangSichuan 621900People’s Republic of China

We study radiative transfer in participating binary stochastic mixtures in two dimensions(2D)by developing an accurate and efficient simulation *** two different sets of physical parameters,2D benchmark results are presented,and it is found that the influence of the stochastic mixture on radiative transfer is clearly *** results confirm that previous multidimensional results obtained in different studies are basically consistent,which is interpreted in terms of the relationship between the photon mean free path l_(p)and the system size *** effects,including those due to scattering and radiation-material coupling,are also *** further understand the particle size effect,we employ a dimensionless parameter l_(p)/L,from which a critical particle size can be *** the basis of further 2D simulations,we find that an inhomogeneous mix is obtained for l_(p)/L>***,2D material temperature distributions reveal that self-shielding and particle-particle shielding of radiation occur,and are enhanced when l_(p)/L is *** work is expected to provide benchmark results to verify proposed homogenized models and/or other codes for stochastic radiative transfer in realistic physical scenarios.

关键词： stochastic radiative dimensions

Hybrid fluid–particle modeling of shock-driven hydrodynamic instabilities in a plasma

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Matter and Radiation at Extremes 2021年第3期6卷 24-32页

作者： Hong-bo Cai Xin-xin Yan Pei-lin Yao shao-ping zhu Institute of Applied Physics and Computational Mathematics Beijing 100094China Center for Applied Physics and Technology HEDPSand College of EngineeringPeking UniversityBeijing 100871China Center for Applied Physics and Technology HEDPSSchool of Physicsand College of EngineeringPeking UniversityBeijing 100871China Department of Engineering Physics Tsinghua UniversityBeijing 100084China Graduate School China Academy of Engineering PhysicsP.O.Box 2101Beijing 100088China Science and Technology on Plasma Physics Laboratory Laser Fusion Research CenterCAEP621900 MianyangChina

Shock-driven hydrodynamic instabilities in a plasma usually lead to interfacial mixing and the generation of electromagnetic fields,which are nonequilibrium processes coupling kinetics with meso-and macroscopic *** understanding and modeling of these physical processes are very challenging tasks for single-fluid hydrodynamic *** work presents a new framework that incorporates both kinetics and hydrodynamics to simulate shock waves and hydrodynamic instabilities in high-density *** this hybrid code,ions are modeled using the standard particle-in-cell method together with a Monte Carlo description of collisions while electrons are modeled as a massless fluid,with the electron heat flux and fluid–particle energy exchange being considered in the electron pressure *** high-density plasmas,Maxwell’s equations are solved using Ohm’s law instead of Ampere’s *** hybrid algorithm retains ion kinetic effects and their consequences for plasma interpenetration,shock wave propagation,and hydrodynamic ***,we investigate the shock-induced(or gravity-induced)turbulent mixing between a light and a heavy plasma,where hydrodynamic instabilities are initiated by a shock wave(or gravity).This study reveals that self-generated electromagnetic fields play a role in the formation of baroclinic vorticity along the interface and in late-time mixing of the *** results confirm the ability of the proposed method to describe shock-driven hydrodynamic instabilities in a plasma,in particular,nonequilibrium processes that involve mixing and electromagnetic fields at the interface.

关键词： hydrodynamic shock mixing

Review of the current status of fast ignition research atthe IAPCM

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High Power Laser Science and Engineering 2014年第1期2卷 4-12页

作者： Hong-bo Cai Si-zhong Wu Jun-feng Wu Mo Chen Hua Zhang Min-qing He Li-hua Cao Cang-tao Zhou shao-ping zhu Xian-tu He Institute of Applied Physics and Computational Mathematics Center for Applied Physics and Technology Peking University

We review the present status and future prospects of fast ignition(FI) research of the theoretical group at the IAPCM(Institute of Applied Physics and Computational Mathematics, Beijing) as a part of the inertial confinement fusion project. Since the approval of the FI project at the IAPCM, we have devoted our efforts to improving the integrated codes for FI and designing advanced targets together with the experimental group. Recent FI experiments [K. U. Akli et al., Phys. Rev. E 86, 065402(2012)] showed that the petawatt laser beam energy was not efficiently converted into the compressed core because of the beam divergence of relativistic electron beams. The coupling efficiency can be improved in three ways:(1) using a cone–wire-in-shell advanced target to enhance the transport efficiency,(2) using external magnetic fields to collimate fast electrons, and(3) reducing the prepulse level of the petawatt laser beam. The integrated codes for FI, named ICFI, including a radiation hydrodynamic code, a particle-in-cell(PIC) simulation code,and a hybrid fluid–PIC code, have been developed to design this advanced target at the IAPCM. The Shenguang-II upgraded laser facility has been constructed for FI research; it consists of eight beams(in total 24 kJ/3ω, 3 ns) for implosion compression, and a heating laser beam(0.5–1 kJ, 3–5 ps) for generating the relativistic electron beam. A fully integrated FI experiment is scheduled for the 2014 project.

关键词： fast ignition integrated simulation codes

A demonstration of extracting the strength and wavelength of the magnetic field generated by the Weibel instability from proton radiography

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High Power Laser Science and Engineering 2019年第3期7卷 37-44页

作者： Bao Du Hong-Bo Cai Wen-Shuai Zhang Shi-Yang Zou Jing Chen shao-ping zhu Institute of Applied Physics and Computational Mathematics Beijing 100094China HEDPS Center for Applied Physics and TechnologyPeking UniversityBeijing 100871China IFSA Collaborative Innovation Center Shanghai Jiao Tong UniversityShanghai 200240China STPPL Research Center of Laser FusionChina Academy of Engineering PhysicsMianyang 621900China Graduate School China Academy of Engineering PhysicsBeijing 100088China

The Weibel instability and the induced magnetic field are of great importance for both astrophysics and inertial confinement *** of the stochasticity of this magnetic field,its main wavelength and mean strength,which are key characteristics of the Weibel instability,are still unobtainable *** this paper,a theoretical model based on the autocorrelation tensor shows that in proton radiography of the Weibel-instability-induced magnetic field,the proton flux density on the detection plane can be related to the energy spectrum of the magnetic *** allows us to extract the main wavelength and mean strength of the two-dimensionally isotropic and stochastic magnetic field directly from proton radiography for the first *** calculations are conducted to verify our theory and show good consistency between pre-set values and the results extracted from proton radiography.

关键词： magnetic field plasma diagnostics proton radiography Weibel instability

Separating the contributions of electric and magnetic fields in deflecting the probes in proton radiography with multiple proton energies

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Matter and Radiation at Extremes 2021年第3期6卷 42-54页

作者： Bao Du Hong-Bo Cai Wen-Shuai Zhang Xiao-Fang Wang Dong-Guo Kang Luan Deng En-Hao Zhang Pei-Lin Yao Xin-Xin Yan Shi-Yang Zou shao-ping zhu Institute of Applied Physics and Computational Mathematics Beijing 100094China HEDPS Center for Applied Physics and TechnologyPeking UniversityBeijing 100871China IFSA Collaborative Innovation Center Shanghai Jiao Tong UniversityShanghai 200240China Department of Engineering and Applied Physics University of Science and Technology of ChinaHefei 230026China Graduate School China Academy of Engineering PhysicsBeijing 100088China Department of Engineering Physics Tsinghua UniversityBeijing 100084China STPPL Research Center of Laser FusionChina Academy of Engineering PhysicsMianyang 621900China

In proton radiography,degeneracy of electric and magnetic fields in deflecting the probe protons can prevent full interpretation of proton flux perturbations in the detection *** this paper,theoretical analyses and numerical simulations suggest that the contributions of the electric and magnetic fields can be separately obtained by analyzing the difference between the flux distributions of two discriminated proton energies in a single shot of proton *** eliminate the influence of field evolution on the separation,a strategy is proposed in which slow field evolution is assumed or an approximate estimate of field growth is *** could help achieve a clearer understanding of the radiographic process and allow further quantitative analysis.

关键词： magnetic fields assumed

Publisher’s Note:“Benchmark simulations of radiative transfer in participating binary stochastic mixtures in two dimensions”[Matter *** 9, 067802 (2024)]

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Matter and Radiation at Extremes 2024年第6期9卷 121-121页

This article was originally published online on 30 August *** to a production error,as originally published the author list was not in its intended *** online versions of this article were corrected on 9 September 202... 详细信息

关键词： dimensions radiative Extreme

不同浓度Netrin-1对人滋养细胞株TEV-1增殖凋亡的影响研究

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中华全科医学 2017年第1期15卷 30-32,75页

作者：钟少平刘霞朱小玉嘉兴市妇幼保健院(嘉兴学院附属妇儿医院)产科浙江嘉兴314015

目的探讨不同浓度Netrin-1对滋养细胞株TEV-1增殖凋亡的影响。方法行经0、10、100及1 000 ng/ml Netrin-1干预TEV-1 24 h后,采用噻唑兰MTT比色法检测细胞增殖指数、流式细胞法检测细胞凋亡率,采用免疫荧光组织化学方法鉴定TEV-1表达Netr... 详细信息

目的探讨不同浓度Netrin-1对滋养细胞株TEV-1增殖凋亡的影响。方法行经0、10、100及1 000 ng/ml Netrin-1干预TEV-1 24 h后,采用噻唑兰MTT比色法检测细胞增殖指数、流式细胞法检测细胞凋亡率,采用免疫荧光组织化学方法鉴定TEV-1表达Netrin-1情况,采用实时定量PCR及western印迹分别检测各组细胞Netrin-1mRNA及蛋白变化情况。结果以递增浓度的Netrin-1预处理TEV-1细胞24 h后,TEV-1细胞增殖行为无影响,但TEV-1细胞凋亡率随Netrin-1浓度增加而降低,当Netrin-1刺激浓度达1 000 ng/ml时,TEV-1细胞总凋亡率下降至(6.63±0.07)%,较空白组(0 ng/ml)凋亡率(14.44±0.85)%下降明显(P<0.01)。Netrin-1表达于滋养细胞细胞质。在培养的滋养细胞株TEV-1中加入不同剂量的Netrin-1干预24 h后,TEV-1 Netrin-1蛋白表达水平无明显变化。结论 Netrin-1能明显降低滋养细胞的凋亡程度,期间涉及机制与滋养细胞Netrin-1表达水平无关。

关键词： Netrin-1 滋养细胞细胞凋亡增殖

Effects of Bifidobacterium lactis BLa80 on fecal and mucosal flora and stem cell factor/c-kit signaling pathway in simulated microgravity rats

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World Journal of Gastroenterology 2025年第1期31卷 93-109页

作者： ping Zhang Ying zhu Pu Chen Tong Zhou Zhe-Yi Han Jun Xiao Jian-Feng Ma Wen Ma Peng Zang Ying Chen Graduate School Hebei North UniversityZhangjiakou 075000Hebei ProvinceChina Key Laboratory of Aerospace Nutrition and Food Engineering China Astronaut Research and Training CenterBeijing 100094China Department of Gastroenterology The Air Force Medical CenterBeijing 100142China Department of Blood Transfusion Air Force Medical CenterBeijing 100142China

BACKGROUND Simulated microgravity environment can lead to gastrointestinal motility *** pathogenesis of gastrointestinal motility disorders is closely related to the stem cell factor(SCF)/c-kit signaling pathway associated with intestinal flora and Cajal stromal ***,intestinal flora can also affect the regulation of SCF/c-kit signaling pathway,thus affecting the expression of Cajal stromal *** cells are the pacemakers of gastrointestinal *** To investigate the effects of Bifidobacterium lactis(***)BLa80 on the intestinal flora of rats in simulated microgravity and on the gastrointestinal motility-related SCF/c-kit *** The internationally recognized tail suspension animal model was used to simulate the microgravity environment,and 30 rats were randomly divided into control group,tail suspension group and drug administration tail suspension group with 10 rats in each group for a total of 28 *** tail group was given *** BLa80 by intragastric administration,and the other two groups were given water intragastric administration,the concentration of intragastric administration was 0.1 g/mL,and each rat was 1 mL/***&eosin staining was used to observe the histopathological changes in each segment of the intestine of each group,and the expression levels of SCF,c-kit,extracellular signal-regulated kinase(ERK)and p-ERK in the gastric antrum of each group were detected by Western blotting and *** fecal flora and mucosal flora of rats in each group were detected by 16S *** Simulated microgravity resulted in severe exfoliation of villi of duodenum,jejunum and ileum in rats,marked damage,increased space between villi,loose arrangement,shortened columnar epithelium of colon,less folds,narrower mucosal thickness,reduced goblet cell number and crypts,and significant improvement after probiotic *** microgravity reduced the expressions of SCF and c-kit,and increased the express

关键词： Simulated microgravity Rat Intestinal flora Gastrointestinal motility Stem cell factor/c-kit signaling pathway

高血压脑出血术后继发颅内G^+球菌感染的治疗方法及效果

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临床医学研究与实践 2019年第25期4卷 46-47页

作者：夏明邵珠平于效良徐州市肿瘤医院神经外科

目的探讨高血压脑出血(HICH)术后继发颅内G^+球菌感染的治疗方法及效果。方法回顾性分析42例因HICH行手术治疗且术后继发颅内G^+球菌感染患者的临床资料。在明确颅内感染的基础上,给予患者留置腰大池引流管,万古霉素全身及鞘内注射,比... 详细信息

目的探讨高血压脑出血(HICH)术后继发颅内G^+球菌感染的治疗方法及效果。方法回顾性分析42例因HICH行手术治疗且术后继发颅内G^+球菌感染患者的临床资料。在明确颅内感染的基础上,给予患者留置腰大池引流管,万古霉素全身及鞘内注射,比较患者不同时间点脑脊液常规及生化指标,分析治疗效果、不良反应发生情况及复发情况。结果患者治疗总有效率为100.0%;患者治疗后第1、3、7天及拔管前的脑脊液中的白细胞计数、总蛋白、葡萄糖及氯化物水平均优于治疗前(P<0.05);在治疗中及治疗后,患者均未出现药物过敏、癫痫等不良反应;所有患者均未出现颅内感染复发。结论留置腰大池引流管联合万古霉素全身及鞘内注射治疗HICH术后继发颅内G^+球菌感染患者的效果好,无不良反应发生,值得推广。

关键词：高血压脑出血颅内G+球菌感染腰大池置管引流