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A simulation study of a windowless gas-stripping room in an E//B neutral particle analyzer

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Nuclear Science and Techniques 2021年第7期32卷 22-30页

作者： Yuan Luo Wei-Ping Lin Pei-Pei Ren Guo-Feng Qu Jing-Jun Zhu Xing-Quan Liu Xiao-Bing Luo Zhu An roy Wada Lin-Ge Zang Yu-Fan Qu Zhong-Bing Shi Key Laboratory of Radiation Physics and Technology of the Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610064China Cyclotron Institute Texas A&M UniversityCollege StationTX 77843USA School of Physics Henan Normal UniversityXinxiang 453007China Southwestern Institute of Physics Chengdu 610064China

The neutral particle analyzer(Npa)is one of the crucial diagnostic devices in a Tokamak *** stripping unit is one of the main parts of the Npa.A windowless gas-stripping room with two differential pipes has been constructed in a parallel electric and magnetic fields(E//B)*** pressure distributions in the stripping chamber are simulated by ANSYS Fluent together with MolFlow+.Based on the pressure distributions obtained from the simulation,the stripping efficiency of the E//B Npa is studied using *** reaction physics is modified to track the charge state of each particle in a cross-section-based method in *** transmission rates(R)and stripping efficiencies f_(+1)are examined for particle energies ranging from 20 to 200 keV with the input pressure(P_(0)),ranging from 20 to 400 *** to the combined global efficiency,R×f_(+1),P_(0)=240 pa is obtained as the optimum pressure for the maximum global efficiency in the incident energy range investigated.

关键词： Neutral particle analyzer Windowless gas-stripping chamber Stripping efficiency Ansys Fluent MolFlow+ GEANT4

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伊朗谜一样的国度

今日民航 2009年第3期 34-41页

作者： pa

电视中,每天都有关于伊朗的报道,伴随美国要打击伊朗的叫嚣,让人有种大战迫在眉睫的紧张。我唯恐伊朗再不去,这个国家就会像伊拉克一样,彻底改变当今的面貌。于是在好友的帮助下,展开了这次向往已久的伊朗之行。

关键词：霍梅尼德黑兰

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狮子王辛巴的荣耀

今日民航 2009年第3期 42-48页

作者： pa

寒流袭击的那天,没有冬天的广州突然出奇的寒冷。面对中国百年不遇的寒冷天气,我选择了逃离。连续飞行了14小时,穿越了5个时区,我降落在南半球被阳光燃烧着的肯尼亚首都内罗毕(NAIROBI)。我和一个中国人以及两个法国人,带上本地的黑人... 详细信息

寒流袭击的那天,没有冬天的广州突然出奇的寒冷。面对中国百年不遇的寒冷天气,我选择了逃离。连续飞行了14小时,穿越了5个时区,我降落在南半球被阳光燃烧着的肯尼亚首都内罗毕(NAIROBI)。我和一个中国人以及两个法国人,带上本地的黑人司机、厨师和充足的食品、水以及扎营设备,开着那辆带天窗的专业狩猎远征(SAFARI)越野车,做一次彻底的狩猎远征。

关键词：野生动物东非大草原肯尼亚内罗毕活火山狮子王

Double-stranded DNA breaks and gene functions in recombination and meiosis

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Cell Research 2006年第5期16卷 402-412页

作者： Wuxing Li~1 Hong Ma~1 ~1The Department of Biology,The Intercollege Graduate Degree Program in Plant Physiology,The Huck Institutes of the Life Sciences,The Pennsylvania State University,University park,pa 16802,USA The Department of Biology The Intercollege Graduate Degree Program in Plant Physiology The Huck Institutes of the Life Sciences The Pennsylvania State University University Park USA

Meiotic prophase Ⅰ is a long and complex *** recombination is an important process that occursbetween homologous chromosomes during meiotic prophase Ⅰ.Formation of chiasmata,which hold homologous chro-mosomes together until the metaphase Ⅰ to anaphase Ⅰ transition,is critical for proper chromosome *** have suggested that the SPO 11 proteins have conserved functions in a number of organisms in generating sites ofdouble-stranded DNA breaks (DSBs) that are thought to be the starting points of homologous *** these sites of DSBs requires the function of RecA homologs,such as RAD51,DMC 1,and others,as suggested bymutant studies;thus *** to repair these meiotic DSBs results in abnormal chromosomal alternations,leading todisrupted *** discoveries on the functions of these RecA homologs have improved the understanding of themechanisms underlying meiotic homologous recombination.

关键词： meiosis homologous recombination double-stranded DNA breaks SPO11 RAD51 DMC1

A Note on the Toughness of Generalized Petersen Graphs

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Journal of Mathematical Research with Applications 1992年第2期 183-186页

作者： Chong-Yun Chao Han Shaocen(Dept. of Math, & Stat., Univ. of Pittsburgh, Pittsburgh, pa 15260 USA)

We show that,for each integer n≥5,the toughness of a generalized Petersengraph with 2n vertices is less than or equal to 4/3,and 4/3 is the best upper bound.

关键词： A Note on the Toughness of Generalized Petersen Graphs

Magnetic Properties and Thermal Stability of Pr_(1-x)La_xCo_(5-y)Alloys

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Journal of Materials Science & Technology 1995年第6期11卷 463-465页

作者： Fazeng LIAN (Dept. of Materials Science and Engineering, Northeastern University, Shenyang, 110006, China)Meiqing HUANG, S.Simizu and W.E.Wallace (Carnegie Mellon Institute, Carnegie Mellon University, Pittsburgh, pa 15213, USA) Northeastern Univ Shanghai China

Pr1-xLaxCo5-y (x=0, 0.15. 0.25, 0.35,1.0, y=0.5, 0.7, 0.9, 1.0) alloys were investigated. The effect of the variation of x and y on magnetic properties and thermal stability of the alloys were studied. The magnetic properties for the Pr0.85La0.15Co4.3 and Pr0.75La0.25Co4.1 magnets are iHc=368 kA/m, Br=0.91 T, (BH)max=145.6 kJ/m3, αBr=-0.03%/℃ and iHc=568 kA/m,Br=0.8 T, (BH)max=127.2 kJ/m3,αBr,=-0.06%/℃, respectively The phase structures of as-cast alloys and magnets were investigated

关键词： La x)La_xCo Magnetic Properties and Thermal Stability of Pr y)Alloys

Twinning in Intermetallic Compounds Are Long Shear Vectors and/or Shuffles Really Necessary?

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Journal of Materials Science & Technology 1993年第5期9卷 313-321页

作者： F.M.Chu David P.Pope Dept.of Materials Science and Engineering,University of Pennsylvania,Philadelphia,pa 19104,USA

In this paper the geometric description and general theory of mechanical twinning are reviewed, the twins in general lattices and superlattices are summarized, and the kinetic process by which mechanical twins form is revisited. A case study of mechanical twinning of HfV2+Nb, (cubic) Laves phase, is presented and the synchroshear of selected atomic layers is proposed to explain the physical process of twin formation. If the twins form in this way, then long shear vectors and / or atomicshuffles are not really necessary.

关键词： twin intermetallic compounds shear vector shuffles

RE-EXAMINATION OF THE DNA-MEDIATED TRANSFORMATION IN GOLDFISH

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Science in China,Ser.B 1983年第7期26卷 700-707页

作者： LILLIAN C.NIU Department of Biology Temple University Philadelphia pa. 19112 USA

DNAs were isolated from goldfish, and the balancer bearing species of newt. They were injected separately into fertilized goldfish eggs. A balancer developed in some newt-DNA injected *** injected goldfish eggs occasionally developed a non-balancer process. These results demonstrated the newt DNA-mediated transfer of the species character from newt to goldfish. The injected DNA was localized by the method of autoradiography using H3-cDNA. Silver grains were found in areas over the colchicine induced metaphase. The incorporation of foreign DNA into chromosomes provides a material basis for genetic transformation.

关键词： DNA RE-EXAMINATION OF THE DNA-MEDIATED TRANSFORMATION IN GOLDFISH

单核细胞向巨噬细胞分化过程中CD44mRNA表达和黏附功能的变化

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上海交通大学学报（医学版） 2008年第9期28卷 1091-1094页

作者：时国朝周灵 Lavailee pa Hoidal JR 徐平上海交通大学医学院瑞金医院呼吸科上海200025 犹他大学健康科学中心内科美国盐湖城犹他84132

目的探讨单核细胞向巨噬细胞分化过程中CD44 mRNA表达和黏附功能的变化。方法应用豆蔻佛波醇乙酯(PMA)诱导单核细胞系U937向巨噬细胞分化;应用RT-PCR分析U937细胞CD44 mRNA表达变化,并以β-actin作为内参进行半定量评价,并对主要条带进... 详细信息

目的探讨单核细胞向巨噬细胞分化过程中CD44 mRNA表达和黏附功能的变化。方法应用豆蔻佛波醇乙酯(PMA)诱导单核细胞系U937向巨噬细胞分化;应用RT-PCR分析U937细胞CD44 mRNA表达变化,并以β-actin作为内参进行半定量评价,并对主要条带进行测序;应用荧光染料BCECF/AM作为探针,测定黏附于激活的内皮细胞上的U937细胞数目。结果与对照组比较,PMA诱导的U937细胞CD44 mRNA总体表达显著增加(P=0.01037),异构体/标准CD44比例显著上升(P=0.0005551),测序结果显示PMA刺激后显著增加的是947 bp(V8+V9+V10)和1208 bp(V7+V8+V9+V10)CD44异构体。同时,PMA刺激后U937细胞黏附功能显著增加(P=0.0029)。结论单核细胞向巨噬细胞分化过程中CD44 mRNA,特别是947bp(V8+V9+V10)和1208 bp(V7+V8+V9+V10)CD44异构体的表达显著增加,可能与细胞黏附功能的增强相关。

关键词：单核细胞 CD44 黏附功能选择性剪切