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Ion Acceleration in Laser-Plasma Interaction: Shock, Sheath, and Scaling

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Communications in Theoretical Physics 2009年第6期51卷 1125-1128页

作者： XIE Bai-Song wu hai-cheng Key Laboratory of Beam Technology and Materials Modification of the Ministry of Education Beijing Normal University Beijing 100875 China College of Nuclear Science and Technology Beijing Normal University Beijing 100875 China

Some notes and comments on ion acceleration in laser-plasma interaction is given, in particular for the implication of shock, sheath and sealing. A simple model is proposed for ion acceleration by the combination of shock and sheath. The obtained scaling relations between the maximum ion energy and laser parameters （power, pulse duration） as well plasma parameter （plasma density）for example α PL 7/12 Eion,max α TL1/3 and Eion,max α ne2/3,are compared to the previous works. Some deficiencies and implications of model and results are discussed.

关键词： laser-plasma acceleration shock waves plasma sheaths

Evaluation of 208,207,206,204Pb in CENDL-3.1

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Evaluation of 208,207,206,204Pb in CENDL-3.1

作者： TAO Xi wu hai-cheng

This work is calculating and evaluating n+Pb reaction,and the evaluation data is adopted in *** is an important structural nucleus,and widely used in nuclear physics and nuclear *** the abundances of Pb are 52.4%,22.1%,24.1%and 1.4%,the evaluation of Pb is most important. Based on a set of neutron optical model potential parameters from Han Yinlu,the total,elastic cross sections and elastic angular distributions are calculated in the region of incident neutron energy

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Re-evaluation of the Complete Set of Neutron Data for 58,60,61,62,64Ni in CENDL-3.1

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Re-evaluation of the Complete Set of Neutron Data for 58,60,...

作者： ZHANG Yue wu hai-cheng

In order to improve the evaluated elastic and inelastic angular distributions and double differential neutron emission spectra from CENDL-3.0 for Nickel,evaluation of the complete set of neutron data for Ni including new measurements up to 20 MeV are presented by using optical model,the pre-equilibrium and equilibrium reaction theories,and the distorted wave Born approximation theory,and considering the benchmark *** optical model parameters were

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Synthesis and properties of nickel borate acylate as a new rubber-steel cord adhesion promoter

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Journal of Central South University of Technology 2001年第4期8卷 244-248页

作者： LI Xiao ru 1,NIE Xi du 2,wu hai ying 1,cheng Ben cheng 1 (1 College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China 2 Hengyang Branch of Hunan University, Hengyang 412000, China) College of Chemistry and Chemical Engineering Central South University Changsha China Hengyang Branch of Hunan University Hengyang China

The synthetic method of nickel borate acylate (NBA), a kind of rubber steel cord adhesion promoter (AP), through nickel carbonate, borate and mixed carboxylic acid was studied. The preparation of nickel carbonate could be performed through reaction of nickel sulfate with sodium carbonate in aqueous solution, in which fractional conversion of nickel was more than 99.9%. The mixed nickel carboxylate was prepared by the reaction of nickel carbonate with isooctanoic acid and acetic acid, under strong stirring for 2 h, the mole ratio of these chemicals were 1∶1∶1.1 respectively, and water should be removed completely by adding of inert organic solvent after reaction was finished so as to avoid hydrolysis of tributyl borate in the second reaction. NBA was synthesized by reaction of mixed nickel carboxylate with tributyl borate under strong stirring at 200 250 ℃ for 6 h. By detection and comparison with 680C product from Manobond Company of England, the NBA synthesized through isooctanoic acid and tributyl borate was very similar to product 680C in IR data, 300% fixed extension strength, tensile strength, hardness and cure curve, and was slightly lower than those of product 680C in tensile failure extensibility and hot air aging. The experimental results show that the prepared NBA can be used as rubber steel cord AP.

关键词： nickel borate acylate adhesion promoter nickel carbonate borate

CENDL-3.1 Data Testing With Critical Benchmarks

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CENDL-3.1 Data Testing With Critical Benchmarks

作者： ZHANG Hua wu hai-cheng

China Evaluated Nuclear Data Library CENDL-3.1 was released in Dec *** of critical benchmarks from the International Handbook of Evaluated Criticality Safety Benchmark Experiments are used for CENDL-3.1 library data *** benchmarks are selected to cover fast,intermediate and thermal *** neutron multiplication factor k eigenvalue calculations have been performed by using continuous energy Monte-Carlo code ***-2.1 and CENDL-3.1 cross sections data files are both used in those calculations. The MCNP4C calculation with continuous energy CENDL-2.1 and CENDL-3.1 cross sections was

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^(233)U评价数据的临界基准检验

原子能科学技术 2012年第10期46卷 1158-1164页

作者：吴海成张华中国原子能科学研究院中国核数据中心北京102413

为检验和改进233 U核反应全套中子评价数据的质量,从国际核临界安全手册ICSBEP中选取快谱、超热谱和热谱临界基准实验装置,对中国评价核数据库CENDL-3.1、美国评价核数据库ENDF/B-Ⅶ.0、日本评价核数据JENDL-3.3和JENDL-4.0中的233 U评... 详细信息

为检验和改进233 U核反应全套中子评价数据的质量,从国际核临界安全手册ICSBEP中选取快谱、超热谱和热谱临界基准实验装置,对中国评价核数据库CENDL-3.1、美国评价核数据库ENDF/B-Ⅶ.0、日本评价核数据JENDL-3.3和JENDL-4.0中的233 U评价数据进行了基准检验。采用蒙特卡罗程序MCNP5计算了所选基准装置的有效增殖因数keff,并与基准值进行比较。运用基于能谱指标的趋势分析、灵敏度分析等方法进行了分析。在基准检验中,现有的233 U评价数据的主要问题是从热临界基准中能谱较硬的装置到超热谱基准装置再到部分快谱临界基准装置,较为普遍地存在keff的严重低估。从热堆设计角度考虑,ENDF/B-Ⅶ.0库233 U评价数据表现较好,但仍高估了共振俘获的贡献。

关键词：核数据基准检验 233U

中国物探仪器发展博览——地球物理学会60年发展之见证

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地球物理学进展 2007年第4期22卷 1338-1343页

作者：吴海成中国地球物理学会北京100029

本文阐述了中国物探仪器应用与研制发展进程中,各个阶段的情况及其特点.同时对今后发展战略和对策提出建议,供各级政府、相关企业、科研单位的决策者和管理者,以及相关的物探科研人员、生产人员参考.

关键词：物探仪器研制应用发展历程战略对策

Predicted Levels of 9Be Based on Theoretical Analysis of Neutron Double-Differential Cross Sections at En=14.1 and 18 MeV

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Predicted Levels of 9Be Based on Theoretical Analysis of Neu...

作者： DUAN Jun-feng ZHANG Jing-shang wu hai-cheng SUN Xiao-jun College of Physics and Technology Guangxi Normal University

By using the light nucleus reaction model,the calculations of the double-differential cross sections of outgoing neutrons from n +Be reactions are *** total outgoing neutrons are only come from the(n,2n)2a reaction channel in neutron induced Be ***(n,2n)2αreaction channel is achieved through six different reaction *** updated level schemes published in 2004 related to the n+Be reactions have been employed in this *** calculated results achieve good agreements with the measured data at E=7.1,8.09,9.09,10.26 ***,when the incident neutron

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磁共振成像系统中低阶平板式匀场线圈的设计

中国电机工程学报 2005年第24期25卷 154-159页

作者：武海澄刘正敏周荷琴中国科学技术大学自动化系安徽省合肥市230027

针对永磁型MRI系统设计了一种平板式匀场线圈,用以改善成像区的磁场均匀性。通过研究磁场球谐函数及其泰勒展开级数,导出了x、y、xz、xz2、x2?y2等低阶径向线圈设计方法,并提出了一种新的混合式轴向匀场线圈设计方法,该方法通过控制轴... 详细信息

针对永磁型MRI系统设计了一种平板式匀场线圈,用以改善成像区的磁场均匀性。通过研究磁场球谐函数及其泰勒展开级数,导出了x、y、xz、xz2、x2?y2等低阶径向线圈设计方法,并提出了一种新的混合式轴向匀场线圈设计方法,该方法通过控制轴向线圈中两组电流的组合实现了对不同轴向磁场分量的获取,简化了设计过程,并通过对各匀场线圈进行磁场仿真检测,规划了线圈半径,使设计方案更为合理。实验结果表明,用该线圈可以将磁场均匀度由27μT/T降为14μT/T,MRI图像质量得到明显改善。

关键词：匀场线圈均匀度磁感应强度磁共振成像永磁体