CU纳米线的高温原位加热XRD研究

采用电化学沉积方法,在孔径约50 nm的阳极氧化铝模板中生长Cu纳米线,经过高温原位加热XRD实验,证实了其热膨胀系数约2.6×10-5 K-1,稍大于块体Cu,与文献中Cu纳米线近似为零的热膨胀系数有明显的区别.对这一现象进行了简要的讨论后得出结论认为:基于模板生长的Cu纳米线,其晶格完整程度是决定热膨胀的重要因素.     

BEPCII电子日志系统

由于北京正负电子对撞机重大改造工程(BEPCII)建设和未来运行的要求,需要提供一个开放的电子日志平台,供BEPCII开发和运行人员进行日志录入并通过网页访问电子日志系统,摆脱传统的书面形式的日志,给大家提供一个公开透明的日志平台.本电子日志系统以德国DESY的电子日志系统为模板研制而成.用了目前比较成熟的JSP技术来生成动态Web应用.本文将介绍BEPCII电子日志系统的研发背景和过程.     

Theoretical research on the transport and ionization rate coefficients in glow discharge dusty plasma

The electron kinetic model for investigating the transport and ionization rate coefficients of argon glow discharge dusty plasma is developed from the Boltzmann equation.Both of the electron-neutral and electron-dust collisions are considered as collision terms in the kinetic equation.The kinetic equation is simplified by employing the local approximation and nonlocal approach under the same discharge conditions,and the corresponding simplified kinetic equations are known as local and nonlocal kinetic equations respectively.Then the electron energy distribution function(EEDF)is obtained by numerically solving the local and nonlocal kinetic equations and the dust charging equations simultaneously.Based on the obtained EEDFs,the effective electron temperature,electron mobility,electron diffusion coefficient and ionization rate coefficient are calculated for different discharge conditions.It is shown that the EEDFs calculated from the local kinetic model clearly differ from the nonlocal EEDFs and both the local and nonlocal EEDFs are also clearly different with Maxwellian distributions.The appearance of dust particles results in an obvious decrease of high energy electrons and increase of low energy electrons when axial electric field is low.With the increase of axial electric field,the influence of dust particles on the EEDFs becomes smaller.The electron mobility and diffusion coefficients calculated on the basis of local and nonlocal EEDFs do not differ greatly to the dust-free ones.While,when dust density nd=10^6 cm^?3,the electron mobility increases obviously compared with the dust-free results at low axial electric field and decreases with the increasing axial electric field until they are close to the dust-free ones.Meanwhile,electron diffusion coefficients for dusty case become smaller and decrease with the increasing axial electric field.The ionization rate coefficients decrease when dust particles are introduced and they approach the dust-free results gradually with the increasing axial electric field.     

“第一届中国(国际)核电仪控技术大会”征文通知

各有关单位:随着我国核电的快速发展,对满足核电需求的仪控技术与装置的研究、设计、制造、选型、应用、维护以及国产化水平都提出了越来越高的要求。为了更好地推动我国核电仪控技术的发展,促进产学研用的紧密结合,同时促进我国核电学术界的国际交流,中国核学会与中国仪器仪表学会共同研究决定联合举办第一届中国(国际)核电仪控技术大会。     

Analysis of the characteristics of the plasma of an RF driven ion source for a neutral beam injector

A radio frequency(RF)driven ion source is a very important component of a neutral beam injector for large magnetic confinement fusion devices.In order to study the key technology and physics of an RF driven ion source for a neutral beam injector in China,an RF ion source test facility was developed at the Institute of Plasma Physics,Chinese Academy of Sciences.In this paper,a two-dimensional fluid model is used to simulate the fundamental physical characteristics of RF plasma discharge.Simulation results show the relationship of the characteristics of plasma(such as electron density and electron temperature)and RF power and gas pressure.In order to verify the effectiveness of the model,the characteristics of the plasma are investigated using a Langmuir probe.In this paper,experimental and simulation results are presented,and the possible reasons for the discrepancies between them are given.This paper can help us understand the characteristics of RF plasma discharge,and give a basis for further R&D for an RF ion source.     

真丝绸的低压汞灯光引发接枝共聚研究

本工作用低压汞灯作为光源,以丙烯酸羟丙酯(2-Hydroxypropyl acrylate,HPA)为单体,对真丝绸的紫外光光化学接技改性进行了系统研究,反应体系中无任何引发剂或者光敏剂.用衰减全反射红外光谱(Attenuated total reflectance infrared spectroscopy,ATR-IR)、差示扫描量热法(Differential scanning calo-danetry,DSC)和热重分析(Thermal gravity analysis,TGA)等对光接枝产物进行了表征.探索了光照反应时间、单体浓度、pH值、多官能团单体的存在对接枝率的影响规律.研究表明,此方法可获得较高的接枝率,且低压汞灯具有无污染、设备简便价格低廉、寿命长,易于操作等优点,是一种有效的真丝绸改性方法.     

纪念王淦昌先生诞辰100周年

2007年5月28日,是我国杰出的核物理学家、中国核学会第一任理事长王淦昌先生诞辰100周年纪念日.中国核学会与相关单位一起举办了一系列活动,缅怀先辈,激励后人. 王淦昌先生是我国杰出的核物理学家、中国科学院资深院士、"两弹一星"功勋奖章获得者、中国实验原子核物理和宇宙射线及粒子物理研究的奠基人.     

Optimization of the Water-Cooled Structure for the Divertor Plates in EAST Based on an Orthogonal Theory

An orthogonal experimental scheme was designed for optimizing a water-cooled structure of the divertor plate.There were three influencing factors:the radius R of the watercooled pipe,and the pipe spacing L₁ and L₃.The influence rule of different factors on the cooling effect and thermal stress of the plate were studied,for which the influence rank was respectively R>L₁>L₃ and L₃>R>L₁.The highest temperature value decreased when R and L₁increased,and the maximum thermal stress value dropped when R,L₁ and L₃ increased.The final optimized results can be summarized as:R equals 6 mm or 7 mm,L₁ equals 19 mm,and L₃ equals 20 mm.Compared with the initial design,the highest temperature value had a small decline,and the maximum thermal stress value dropped by 19%to 24%.So it was not ideal to improve the cooling effect by optimizing the geometry sizes of the water-cooled structure,even worse than increasing the flow speed,but it was very effective for dropping the maximum thermal stress value.The orthogonal experimental method reduces the number of experiments by 80%,and thus it is feasible and effective to optimize the water-cooled structure of the divertor plate with the orthogonal theory.     

Recent Progress of the HL-2A Multi-Channel HCOOH Laser Interferometer/Polarimeter

A multichannel methanoic acid（HCOOH,λ= 432.5μm） laser interferometer/polarimeter is being developed from the previous eight-channel hydrogen cyanide（HCN,λ=337 μm） laser interferometer in the HL-2A tokamak.A conventional Michelson-type interometer is used for the electron density measurement,and a Dodel-Kunz-type polarimeter is used for the Faraday rotation effect measurement,respectively.Each HCOOH laser can produce a linearly polarized radiation at a power lever of ³0 mW,and a power stability <10%in 50 min.A beam waist（diameter d₀≈12.0 mm,about 200 mm away from the outlet） is finally determined through a chopping modulation technique.The latest optical layout of the interferometer/polarimeter has been finished,and the hardware data processing system based on the fast Fourier transform phasecomparator technique is being explored.In order to demonstrate the feasibility of the diagnostic scheme,two associated bench simulation experiments were carried out in the laboratory,in which the plasma was simulated by a piece of polytetrafluoroethene plate,and the Faraday rotation effect was simulated by a rotating half-wave plate.Simulation results agreed well with the initial experimental conditions.At present,the HCOOH laser interferometer/polarimeter system is being assembled on HL-2A,and is planned to be applied in the 2014-2015 experimental campaign.     

Instructions for Manuscript Preparation

<正>Plasma Science and Technology(PST)is a journal reporting novel experimental and theoretical results and progress of interdisciplinary and application sciences in the fields related to Plasma Physics.Specific interested areas include:basic plasma phenomena;magnetically confined plasma;inertially confined plasma;astrophysics and space plasma;low temperature plasma;plasma     

Boundary Effect of Planar Glow Dielectric Barrier Discharge and Its Influence on the Discharge Structure

The dielectric barrier discharge(DBD) in the glow regime in neon has been investigated by experiment and two-dimensional(2D) fluid modeling.The discharge was carried out in a planar DBD system with segmented-electrodes driven by square-wave voltage.The results show that the glow DBD originates in the center of the electrode and expands outward to the electrode edge during each half cycle of the voltage,forming a radial structure.The discharge decays firstly in the inner area but sustains longer in the edge area,showing a reversed discharge area.The discharge cannot completely cover the entire electrode surface,but remains a border of non- or weak discharge.The fluid modeling shows a similar result in agreement with the experiments.The simulations indicate that the electric field in the edge area is distorted due to the boundary effect so that the electric field and charge distribution are different from that in the inner part.The distorted field reduces the longitudinal component near the edge and causes the local field to be lower than that in the center,and hence makes the discharge behindhand.It also induces a transverse field that makes the discharge extend radially outward to the edge.The boundary effect plays an important role in the glow DBD structure.     

Instructions for Manuscript Preparation

<正>Plasma Science and Technology(PST)is a journal reporting novel experimental and theoretical results and progress of interdisciplinary and application sciences in the fields related to Plasma Physics.Specific interested areas include:basic plasma phenomena;magnetically confined plasma;inertially confined plasma;astrophysics and space plasma;low temperature plasma;plasma technology and fusion engineering.     

美国能源部部长发起新的威胁隆低倡议

美国能源部(DOE)部长Spencer Abrabam在2004年5月26日与国际原子能机构(IAEA)高官举行的会谈中，宣布了一项新的全球性倡议，旨在加快防止高危核材料和放射性材料落入恐怖分子或无赖国家的手中。Abrabam说，这项被称作“全球威胁降低倡议(GTRI)”的计划是用来应对各种核材料造成的威胁，     

越南发展核电的必要性

【美国《核新闻》2004年7月报道】英国原子能管理局（UKAEA）以754万英镑（1300万美元）的价格将位于多塞特郡的温弗里斯（Winfrith）技术中心出售给作为合作伙伴的英国国家重建局。这对UKAEA而言是一个重大的里程碑，因为UKAEA的任务是进行核设施的退役工作并取消其许可证，以及恢复这些场址以作他用。UKAEA的温弗里斯技术中心占地125英亩，其核实验室和仪器厂房经过整修，容纳了约40家机构，其中包括生态学和水文地理学中心以及国防科学和技术实验室等技术组织。在取消许可证的第一阶段工作完成后，UKAEA计划到2020年之前彻底…     

保加利亚科兹洛杜伊核电厂签署建造干式乏燃料贮存设施的建造合同

【美国《核新闻》2004年8月刊报道】美国能源部(DOE)已选择AMEC公司的GeoMelt技术来处置汉福德场区的放射性废物。根据一份有效期将持续到2006年9月总价值达到5300万美元的合同,AMEC将在汉福德场区设计、建造和运营一座GeoMelt玻璃固化中间工厂。AMEC表示,中间工厂的建设和运营将为一座或多座工业规模的GeoMelt工厂(该项目总价值约14亿美元,工程将持续到2028年。)提供设计、建造和运营经验。GoeMelt技术是在一个可耐高温的容器中使用电极来熔融受到污染的土壤和废物。熔融温度能达到2000℃。该工艺在通过高温分解反应和催化反应来…     

美国核武器中心的未来蓝图

【美国核军工管理局网站2006年4月5日报道】美国核军工管理局(NNSA)主管国防计划的副局长Tom P.D’Agostino于2006年4月5日向众议院武器装备委员会描述了美国核武器中心的未来蓝图。指导原则为了满足美国2002年《核态势评估报告》(NPR)所提出的建立灵活反应1的核武器基础设施的要求,美国能源部(DOE)将与国防部(DOD)展开密切合作,以便能在下述原则的指导下实现美国库存核武器及其基础设施的转型:确保美国核威慑力量的长期安全性和可靠性;为现有的库存核武器提供支持,并同时实现向未来库存核武器和基础设施的转型;实施可靠替换弹头(RR…     

A Steam-Plasma Igniter for Aluminum Powder Combustion

High-temperature ignition is essential for the ignition and combustion of energetic metal fuels,including aluminum and magnesium particles which are protected by their highmelting-temperature oxides.A plasma torch characterized by an ultrahigh-temperature plasma plume fulfills such high-temperature ignition conditions.A new steam plasma igniter is designed and successfully validated by aluminum power ignition and combustion tests.The steam plasma rapidly stabilizes in both plasma and steam jet modes.Parametric investigation of the steam plasma jet is conducted in terms of arc strength.A high-speed camera and an oscilloscope method visualize the discharge characteristics,and optical emission spectroscopy measures the thermochemical properties of the plasma jet.The diatomic molecule OH fitting method,the Boltzmann plot method,and short exposure capturing with an intensified charge coupled device record the axial distributions of the rotational gas temperature,excitation temperature,and OH radical distribution,respectively.The excitation temperature at the nozzle tip is near 5500 K,and the gas temperature is 5400 K.     

人物介绍——黄树桃

黄树桃,男,汉族,1966年2月生,湖南娄底人;高级工程师(研究员级),硕士生导师,博士生副导师。1988年毕业于华东地质学院铀矿地质专业,获学士学     

国际原子能机构

国际原子能机构(原子能机构)是世界的核合作中心,1957年作为联合国系统内原子用于和平的政府间组织创建,它以帮助防止核武器扩散以及为人类发展推动有益核技术的安全、有保证以及和平的利用等必不可少的方式促进全球的和平、发展和安全。原子能机构的使命涵盖3个主要工作支柱,权限源于其《规约》: