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The activation properties of SIMP steel have been simulated under the conditions of the water cooled ceramic breeder (WCCB) blanket for China Fusion Engineering Test Reactor (CFETR) by coupling of the MCNP (Monte Carlo N-Particle Transport Code) and FISPACT activation code. The simulation results of specific activity, decay heat, contact dose rate and radiation damage of SIMP steel have been fully compared with other RAFM steel such as EUROFER-97, F82H and so on. The comparisons show that the SIMP has good activation performance corresponding to low activation performance of RAFM. It is conclusion that the SIMP can be chosen as one candidate structural material used for future fusion reactor blanket.     

Erd?s-Ginzburg-Ziv定理的一个新证明

本文给出Erd?s-Ginzburg-Ziv定理的一个新证明     

GC-MS法测定涂料中的四溴双酚A

建立了GC-MS法检测涂料中四溴双酚A的分析方法,并对样品前处理条件和GC-MS分析条件进行优化。采用二氯甲烷-丙酮(1∶1)混合溶剂超声提取样品,萃取液经硅胶小柱净化,平行蒸发定量浓缩后采用气相色谱-质谱法测定,外标法定量。结果显示,四溴双酚A标准溶液在1~50 mg/L范围内线性关系良好,相关系数大于0.999;方法的定量下限(LOQ)为2 mg/kg,加标回收率为83.2%~104%,相对标准偏差(RSD,n=8)为2.6%~4.7%。该方法操作简便、分析快速、结果准确,可满足涂料中四溴双酚A的定性定量分析要求。     

80keV N离子注入对ZnO薄膜结构的影响

室温下用80keVN离子注入ZnO薄膜样品,注量分别为5.01014,5.01015和5.01016ions/cm2,然后用X射线衍射和透射电镜技术对样品的结构特性进行了表征。实验结果表明,由高度(002)择优取向的致密柱状晶构成的薄膜中,注入5.0×1015ions/cm2时,观测到缺陷生成和局域无序化现象,但薄膜总体结构仍保持柱状晶和(002)择优取向;随着注量的增大,晶格常数c和压应力呈增大趋势。对注入N离子对ZnO薄膜结构特性的影响机理进行了简单的讨论。     

Fe/Nb多层膜中离子辐照效应研究(英文)

〗采用磁控溅射技术在Si衬底上沉积Si/\[Fe(10 nm)/Nb(4 nm)/Fe(4 nm)/Nb(4 nm)\]2/ \[Fe(4 nm)/Nb(4 nm)\]4多层膜。 用2 MeV的 Xe离子在室温下辐照多层膜。采用俄歇深度剖析、X射线衍射和振动样品磁强计分析辐照引起的多层膜元素分布、 结构及磁性变化。AES深度剖析谱显示当辐照注量达到1.0×1014 ions/cm2时, 多层膜界面两侧元素开始混合; 当辐照注量达到2.0×1016ions/cm2时, 多层膜层状结构消失, Fe层与Nb层几乎完全混合。XRD谱显示, 当辐照注量达到1.0×1014ions/cm2时, Nb的衍射峰和Fe的各衍射峰的峰位相对于标准卡片向小角方向偏移, 这说明辐照引起Nb基和Fe基FeNb固溶体相的形成;当辐照注量大于1.0×1015 ions/cm2时, 辐照引起非晶相的出现。 VSM测试显示,多层膜的磁性随着结构的变化而变化。 在此实验基础上, 对离子辐照引起界面混合现象的机理进行了探讨。The behavior of the metallic multilayers of Si/\[Fe(10 nm)/Nb(4 nm)/Fe(4 nm)/ Nb(4 nm)\]2/\[Fe(4 nm)/Nb(4 nm)\]4 under 2 MeV Xe ion irradiation has been investigated by depth profile analysis of Auger electron spectroscopy,X ray diffraction and vibrating sample magnetometer. The obtained experimental results show that the inter mixing between Fe and Nb layers occurs in the 1.0×1014 ions/cm2 irradiated multilayer sample which results in the formation of Nb based and Fe based FeNb solid solution. For the samples irradiated to fluence larger than 1.0×1014 ions/cm2, amorphisation is observed, and moreover, the layered structure of the multilayer samples is broken up completely for the samples under 1.0×1016 or 2.0×1016 ions/cm2 irradiation. Vibrating sample magnetometer measurement also reveals that the magnetization of the samples changes with the evolution of the structure of multilayers. Possible mechanism of the modification in Fe/Nb multilayers induced by Xe ion irradiation is briefly discussed.     

微束辐照装置及其在生物和材料领域中的应用

自从20世纪50年代开始利用微束辐照生物活细胞以来,由于微束独特的辐照特征, 其在生物学、 材料学、 生物医学、航空航天科学、环境科学、地质学、微加工等领域得到了广泛的应用。 在前人大量研究的基础上, 对微束装置及其应用进行总结概括。 展望了微束的发展趋势并简单介绍中国科学院近代物理研究所正在兴建的中高能重离子微束辐照装置。 Collimated proton microbeam has been used to irradiate the biological living cells since 1850s. Due to its unique characteristic in irradiation, microbeam has been extensively applied to many research fields,such as biology, material science, biomedicine,aeronautics and stronautics, environmental science, geology,micromachining and so on. Based on the much research of predecessors, the microbeam facilities and their corresponding applications are summarized in this paper. At last,prospects on the development trend of microbeam are made, and the intermediate energy and high energy heavy ion microbeam irradiation facility being constructed at the Institute of Modern Physics of Chinese Academy of Sciences is briefly introduced.     

石墨炉原子吸收光谱法直接测定生态纺织品萃取汗液中痕量铅

纺织品萃取汗液中痕量Pb是生态纺织品标准重点限制项目,然而,由于生态纺织品标准中对Pb的限量极为严格,而且萃取汗液基体成分复杂,高浓度NaCl基体的背景吸收干扰强烈,使得纺织品萃取汗液中痕量Pb一直是生态纺织品检测的一个难点.文章采用石墨炉原子吸收光谱法(GFAAS)直接测定生态纺织晶萃取汗液巾的痕量元素Pb.通过对NH4H2PO4,NH4NO3,Pd(NO3)2,Ni(NO3)2,抗坏血酸等单个或混合基体改进剂进行筛选,并对石墨炉原子化工作条件和基体改进剂用量进行优化.试验结果表明,加入5μL 50 g·L-1 NH4NO3与100 mg·L-1 Pd溶液(1:1)混合试剂,可以有效地抑制Pb的挥发,降低背景信号.仪器检出限可达到0.7μg·L-1,方法精密度RSD为3.2%,实际纺织品样品加标回收率为95.5%～105%之间.     

数据驱动模型的血液物种光谱检测技术

介绍一种基于光谱检测和数据驱动模型的非接触式血液物种识别技术。选取了4个物种(猴144,大鼠203,狗133,人169)共计649个血样作为原始样本。超连续谱激光光源的波长范围是450～2 400 nm。分别采集抗凝管盛装血液样本的后向散射可见光谱(294～1 160 nm)和十个不同空间位点的前向散射近红外光谱(1 021～1 757 nm),将十一条光谱数据顺序连接为一维数据作为每个样本的原始数据。利用主成分分析法对数据集进行特征信息提取,保留原始差异信息量的99.99%,同时将数据量压缩为原始数据量的1.5%,提高分类识别的运算效率。对不同数量的训练集和验证集进行训练预测实验表明,十折交叉验证的识别误差率随着样本数量的增加而降低,样本库规模的增大可以提高识别的精确度。由于数据驱动模型是基于机器学习算法的数据流处理模型,因而可以采用多种不同的分类算法实现。通过比较人工神经网络、支持向量机、偏最小二乘回归、多元线性回归、随机森林和朴素贝叶斯的识别效果可以发现,不同算法的识别效果具有类别差异性,即各个算法的正确识别率排序在不同的物种中是有差异的。因而实际应用中,在选择数据驱动模型时,除了需要考虑算法的整体识别率之外,当对部分类别的识别效果有额外要求时,还应该考虑算法本身的类别差异性。     

Splitting Unknown Qubit State Using Five-Qubit Entangled State

In this paper, we demonstrate how a five-qubit entangled state can be used to realize the deterministic Quantum State Sharing (QSTS) of a single and two-qubit state among three parties by performing von-Neumann measurement and bell-state measurements. In our scheme, any of the two agents has the ability to reconstruct the original state if he/she collaborates with the other agent,otherwise an individual agent does not have enough information to reconstruct the original state. The paper also outlines the various measurements and mathematical framework of the scheme. The security analysis of our scheme against two attacks scenarios prove that the scheme is secure against an eavesdropper attack and a malicious attacks.     

离子辐照单晶Si损伤效应的研究

回顾了低能离子注入单晶Si经由核弹性碰撞引起的损伤特征及其常规的研究方法,介绍了快重离子辐照单晶Si经由电子能损引起的损伤特点及研究现状,并对该领域的研究作了展望. The radiation damage in silicon induced by low energy ion implantation was briefly reviewed together with a short introduction to the common techniques in the area. The damage characteristics of swift heavy ion irradiation in silicon and its investigations were introduced with emphasis on the effects induced by processes of electronic energy losses. It is shown that swift heavy ion can induce defects far beyond the projected range and up to 28 MeV/μm the electronic energy ...