共查询到18条相似文献,搜索用时 75 毫秒
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核探针的概念起源于电子探针,它综合了离子束分析技术的特点,已成为很有应用前景的分析工具.本文结合上海新建成的核探针,介绍它们的原理、结构和部分应用. In concept,the scanning nuclear microprobe is similar to the scanning electron micro-probe,but has much higher sensitivity for microanalysis.The main features and the construction of thenew-built Nuclear Microprobe in Shanghai are described.It has been proved to be an ideal tool for mi-croanalysis in the fields of medical and biology,metallurg,microelectronics,archaeology and earthsciences.Its potentiality is demonstrated with examples in the applications of these fields. 相似文献
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本文概述了质子非弹性散射分析的新方法-LEA方法。LEA方法从实验上得到了有效相互作用的准确知识,为有效相互作用的理论研究提供了实验依据,同时,它也被用于提取冲子过剩核的中子跃迁密度,为核构型提供了新的严格检验。 相似文献
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基于上海应用物理研究所的扫描质子微探针系统,对扫描透射离子显微成像(STIM)技术进行了仿真分析和实验研究,建立了基于中值滤波方法的数据处理程序,获得了大鼠股骨切片的面密度分布和薄壁小球的离轴STIM图像。理论分析和实验结果显示:由在轴探测数据的中值滤波结果可以计算出定量的面密度分布信息,由能量窗滤波的离轴探测数据则可以给出高分辨的定性图像,这在薄样品、强束流、以及质子激发X荧光(PIXE)分析同时进行的STIM分析中尤为有用;增加获取的事件数、选择合适的滤波方法可以使测量误差远小于阻止本领计算带来的误差。该方法可以用于测量几十μm尺度样品的绝对质量以及辅助PIXE技术进行元素定量分布分析。 相似文献
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基于上海应用物理研究所的扫描质子微探针系统,对扫描透射离子显微成像(STIM)技术进行了仿真分析和实验研究,建立了基于中值滤波方法的数据处理程序,获得了大鼠股骨切片的面密度分布和薄壁小球的离轴STIM图像。理论分析和实验结果显示:由在轴探测数据的中值滤波结果可以计算出定量的面密度分布信息,由能量窗滤波的离轴探测数据则可以给出高分辨的定性图像,这在薄样品、强束流、以及质子激发X荧光(PIXE)分析同时进行的STIM分析中尤为有用;增加获取的事件数、选择合适的滤波方法可以使测量误差远小于阻止本领计算带来的误差。该方法可以用于测量几十μm尺度样品的绝对质量以及辅助PIXE技术进行元素定量分布分析。 相似文献
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复旦大学核微探针系统 总被引:1,自引:0,他引:1
复旦大学现代物理研究所利用国家“211工程”的资助,从英国Oxford Microbeams公司引进了微探针关键部件,建立了新的核微探针实验装置.介绍了该装置各个组成部分,包括束线,靶室,聚集、扫描系统以及数据采集系统等.现已得到线度为μm量级的离子束.A nuclear microprobe was set up at the Institute of Modern Physics of Fudan University.The key parts were imported from Oxford Microbeams Ltd.The hardware system of the microprobe,including beam line,target chamber,focusing system and DAQ system is introduced. About several micrometer could be achieved at present beam spot size. 相似文献
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简要介绍了国际上发展中的核科学和技术及其应用对微观核数据的需求和核数据理论计算中现有标准程序的基本情况,并做了相应的分析和比对 .同时也简要介绍了国际上核数据理论计算中模型方法研究的新进展.Developing nuclear data needs towards to sustainable development on fission reactor design and many nuclear applications out the field of fission reactor technology that are growing economic significance and that have substantial data requirements are introduced. International standard codes used in nuclear data evaluation and calculation are presented and compared with each other. Generally speaking, three rather wide groups of nuclear reaction models used usually are also described... 相似文献
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用于团簇碰撞研究的多路多道谱数据在线获取与处理系统 总被引:1,自引:0,他引:1
开发成功了基于ISA总线的智能高速AD数据采集接口电路。在一台PC微机中,可以同时使用多个该接口电路而不占用更多的PC机内存空间。在显示和处理数据时,数据采集速度不受影响。在Windows环境下开发成功了配套软件。用此接口电路构成了多路多道能谱数据获取与在线处理系统,并已成功地应用于微团簇与固体相互作用的实验研究中。 相似文献
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A Flash-ADC data acquisition system developed for a drift chamber array and a digital filter algorithm for signal processing 下载免费PDF全文
Han Yi Li-Ming L& uuml Zhao Zhang Wen-Jing Cheng Wei Ji Yan Huang Yan Zhang Hong-Jie Li Yin-Ping Cui Ming Lin Yi-Jie Wang Li-Min Duan Rong-Jiang Hu Zhi-Gang Xiao 《中国物理C(英文版)》2016,40(11):116102-116102
A Flash-ADC data acquisition (DAQ) system has been developed for the drift chamber array designed for the External-Target-Experiment at the Cooling Storage Ring at the Heavy Ion Research Facility, Lanzhou. The simplified readout electronics system has been developed using the Flash-ADC modules and the whole waveform in the sampling window is obtained, with which the time and energy information can be deduced with an offline processing. A digital filter algorithm has been developed to discriminate the noise and the useful signal. With the digital filtering process, the signal to noise ratio (SNR) is increased and a better time and energy resolution can be obtained. 相似文献
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针对目前舌诊研究中在舌体信息全面获取方面存在严重不足,将高光谱技术用到舌诊的研究中来,提出了一种基于X-Y振镜扫描式舌诊高光谱采集系统.通过模拟实验,采集与舌体大小相似图片的高光谱信息,验证了该系统可以用于舌体高光谱信息采集,实验结果表明,与现有舌诊客观化研究相比,该系统可以获得更多的舌体信息,为舌诊客观化研究提供了一... 相似文献
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H.M. Ledbetter 《Journal of Physics and Chemistry of Solids》1973,34(4):721-723
Accepted views concerning Poisson's ratio for central-force polycrystals are amended. For pulycrystals the ratio can vary from 1/4, which is actually a lower limit. An upper limit of Poisson's ratio exists also. Both limits can be calculated from single-crystal elastic data. The limits correspond to Voigt's and Reuss's states of uniform local strain and of uniform local stress, respectively. 相似文献