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C8051F020 MCU在核谱测量系统中的应用研究 被引量:9
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作者 周建斌 周蓉生 黄锦华 《核电子学与探测技术》 CAS CSCD 北大核心 2005年第5期515-518,共4页
利用高性能的C 8051F 020单片机设计了一种核谱测量系统,系统与微机连接实现了谱数据的实时采集。直接利用C 8051F 020已经封装的一个12位的100kH z的逐次逼近型ADC,两路12位的电压型DAC中的一路,片上的4k字节XRAM,加上过峰检测电路构... 利用高性能的C 8051F 020单片机设计了一种核谱测量系统,系统与微机连接实现了谱数据的实时采集。直接利用C 8051F 020已经封装的一个12位的100kH z的逐次逼近型ADC,两路12位的电压型DAC中的一路,片上的4k字节XRAM,加上过峰检测电路构成多道分析系统。利用C 8051F 020上ADC 0的差分输入,一路为输入信号,一路为DAC 0的输出,实现滑尺,可以明显地改善测量谱仪的微分非线性。用N aI(T l)探测器的信号作测试,实测了137C s的谱图。 展开更多
关键词 滑尺 核谱测量 C8051F020 微分非线性 死时间
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USB接口技术在核谱测量系统中的应用研究 被引量:6
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作者 周建斌 黄锦华 《核电子学与探测技术》 CAS CSCD 北大核心 2004年第5期506-510,共5页
利用USB接口技术,采用USB100模块与高性能单片机W77E58结合设计了两种核谱测量系统与微机的接口方法,实现了核谱测量系统的实时数据采集。由于USB100模块已经封装了USB协议,接口非常简单,对于微机系统它是COM3或COM4,对于单片微机或其... 利用USB接口技术,采用USB100模块与高性能单片机W77E58结合设计了两种核谱测量系统与微机的接口方法,实现了核谱测量系统的实时数据采集。由于USB100模块已经封装了USB协议,接口非常简单,对于微机系统它是COM3或COM4,对于单片微机或其他信号处理单元它是一个简单的I/O端口,使得新一代的核谱测量系统可以非常方便地从ISA、RS232总线转向USB总线。对于采用RS232的测量系统,微机系统的测量程序可以完全兼容新的USB测量系统,稍作修改既可充分发挥USB接口的优越性能。 展开更多
关键词 USB接口 核谱测量系统 实时数据采集 死时间 W77E58单片机 兼容性
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一种新型测氡仪-α谱仪的研制 被引量:3
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作者 周建斌 任家富 童运福 《核电子学与探测技术》 CAS CSCD 北大核心 2005年第6期701-703,共3页
采用半导体探测器,利用核谱测量技术与嵌入式技术研制的新型测氡仪-α谱仪。可以很好的解决连续测氡与瞬时测氡以及α谱测量的要求。利用静电收集氡衰变子体进行测量,灵敏度高,现场获取结果,体积小,操作方便。可用于室内测氡、壤中测氡... 采用半导体探测器,利用核谱测量技术与嵌入式技术研制的新型测氡仪-α谱仪。可以很好的解决连续测氡与瞬时测氡以及α谱测量的要求。利用静电收集氡衰变子体进行测量,灵敏度高,现场获取结果,体积小,操作方便。可用于室内测氡、壤中测氡、水溶液测氡以及钍射气测量等领域。 展开更多
关键词 Α 子体 核谱测量 壤中氡
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一种新型测氡仪-α谱仪的性能与应用研究
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作者 周建斌 王磊 童运福 《核电子学与探测技术》 CAS CSCD 北大核心 2011年第7期823-826,共4页
分析了222Rn以及220Rn衰变产生α粒子的过程,以及采用半导体探测器,利用核谱测量技术与嵌入式技术研制的新型测氡仪-α谱仪的基本原理,通过各种测试结果的对比,确定了仪器的基本设计参数。通过对分析方法,标定方法的分析,认为该仪器可... 分析了222Rn以及220Rn衰变产生α粒子的过程,以及采用半导体探测器,利用核谱测量技术与嵌入式技术研制的新型测氡仪-α谱仪的基本原理,通过各种测试结果的对比,确定了仪器的基本设计参数。通过对分析方法,标定方法的分析,认为该仪器可以满足连续测氡与瞬时测氡以及α谱测量的要求。可用于室内测氡、壤中测氡、水溶液测氡以及钍射气测量等领域。 展开更多
关键词 Α 核谱测量 衰变 壤中氡
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低温高密核物质测量谱仪时间投影室的集团重建
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作者 朱毅 Shyam Kumar +7 位作者 胡晨露 陈梓轩 张亚鹏 赵凤仪 魏向伦 段利敏 许怒 仇浩 《原子核物理评论》 CAS CSCD 北大核心 2021年第4期416-422,共7页
低温高密核物质测量谱仪(CEE)是研究高重子数密度区核物质性质的重离子碰撞实验谱仪。使用了先进的SAMPA电子学读出芯片的时间投影室(TPC)是CEE最核心的探测器。在集团重建的过程中,同一排读出板的信号被首先重建成2维集团,然后根据2维... 低温高密核物质测量谱仪(CEE)是研究高重子数密度区核物质性质的重离子碰撞实验谱仪。使用了先进的SAMPA电子学读出芯片的时间投影室(TPC)是CEE最核心的探测器。在集团重建的过程中,同一排读出板的信号被首先重建成2维集团,然后根据2维集团的ADC加权平均位置重建击中点。当信号ADC随漂移时间变化呈峰-谷-峰结构时,一个集团可能被重建成两个或更多击中点,从而提高双径迹分辨能力。使用模拟信号的测试显示,该重建算法在方向可以达到0.100/0.043 cm的位置分辨能力和1.1/2.8 cm的双径迹分辨能力。 展开更多
关键词 低温高密物质测量 时间投影室 集团重建
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Structural Description of Polyaromatic Nucleus in Residue 被引量:1
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作者 Zhang Huicheng Yan Yongjie +1 位作者 Sun Wanfu Wang Jifeng 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2007年第3期35-42,共8页
The proton nuclear magnetic resonance spectroscopy (1H-NMR), the synchronous fluorescence spectrometry (SFS) and the ruthenium ions catalyzed oxidation (RICO) method were used to determine the chemical structure... The proton nuclear magnetic resonance spectroscopy (1H-NMR), the synchronous fluorescence spectrometry (SFS) and the ruthenium ions catalyzed oxidation (RICO) method were used to determine the chemical structure of polyaromatic nucleus in Oman residue fractions. The results of 1H-NMR analyses showed that the average numbers of aromatic rings in the aromatics, resins and asphaltenes units were 3.2, 5.6 and 8.2, respectively. SFS was used to investigate the distribution of aromatic rings in residue fractions, the main distribution range of aromatic rings in aromatics, resins and asphaltenes were 3 4 rings, 3--5 rings and more than 5 rings, respectively. The aromatic network in residue fractions was oxidized to produce numerous carboxylic acids. The types and content of benzenepolycarboxylic acids, such as phthalic acid, benzenetricarboxylic acids, benzenetetracarboxylic acids, benzenepentacarboxylic acid and benzenehexacarboxylic acid disclosed the condensed types of aromatic nuclei in the core. The biphenyl fraction (BIPH), the cata-condensed fraction (CATA), the peri-condensed fraction (PERI) and the condensed index (BCI) were calculated based on the benzenepolycarboxylic acids formed. The results implied that there was less biphenyl type structures in all residue fractions. The aromatics fraction was almost composed of the cata-condensed type system, and the asphaltenes fraction was wholly composed of the peri-condensed type system, while in the resins fraction co-existed the two types, herein the peri-con- densed type was predominant over the cata-condensed type. Based on the analytical results obtained in the study, the components --aromatics, resins and asphaltenes -- were given the likely structural models. 展开更多
关键词 proton nuclear magnetic resonance spectroscopy synchronous fluorescence spectrometry ruthenium ions catalyzed oxidation RESIDUE STRUCTURE
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Corresponding Factors Influencing Crude Oils Assay Using Low-field Nuclear Magnetic Resonance 被引量:4
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作者 Feng Yunxia Chu Xiaoli +1 位作者 Xu Yupeng Tian Songbai 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2014年第2期34-39,共6页
In this study, the main factors influencing the measurements by means of the off-line low-field 1H NMR in the lab were discussed base on a robust calibration model established by the PLS algorithm using 255 crude oil ... In this study, the main factors influencing the measurements by means of the off-line low-field 1H NMR in the lab were discussed base on a robust calibration model established by the PLS algorithm using 255 crude oil samples. The preheating temperature had a great influence on the viscosity of oil samples and the resolution of spectral analysis. The repeatability of spectral measurements was impacted by the metal and wax content of the oil samples. For the case of high wax content oils, the wax species began to crystallize in the course of determination that could affect the repeatability of spectral measurements. These factors have evidenced why the preheating devices and filter unit are necessary when low field NMR system is used in the online analysis process. The investigation is very important for the on-line application of the low field NMR. 展开更多
关键词 low-field NMR influencing factors crude oils assay
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Measurement of the Energy Spectrum of the Neutrons inside the Neutron Flux Trap Assembled in the Center of the Reactor Core IPEN/MB-01
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作者 Ulysses d'Utra Bitelli Luiz Ernesto Credidio Mura Diogo Feliciano dos Santos Rogério Jerez 《Journal of Energy and Power Engineering》 2014年第11期1817-1823,共7页
This paper presents the neutron energy spectrum in the central position of a neutron flux trap assembled in the core center of the research nuclear reactor IPEN/MB-01, obtained by an unfolding method. To this end, we ... This paper presents the neutron energy spectrum in the central position of a neutron flux trap assembled in the core center of the research nuclear reactor IPEN/MB-01, obtained by an unfolding method. To this end, we have used several different types of activation foils (Au, Sc, Ti, Ni, and plates) which have been irradiated in the central position of the reactor core (setting number 203) at a reactor power level (64.57±2.91 watts). The activation foils were counted by solid-state detector HPGe (high pure germanium detector) (gamma spectrometry). The experimental data of nuclear reaction rates (saturated activity per target nucleus) and a neutron spectrum estimated by a reactor physics computer code are the main input data to get the most suitable neutron spectrum in the irradiation position obtained through SANDBP (spectrum analysis neutron detection code-version Budapest University) code: a neutron spectra unfolding code that uses an iterative adjustment method. the integral neutron flux, (2.41 ± 0.01) × 10^9 n·cm^-2·s^-1 for the thermal The adjustment resulted in (3.85 ± 0.14) × 10^9 n·cm^-2·s^-1 for neutron flux, (1.09 ±0.02) × 10^9n·cm^-2·s^-1 for intermediate neutron flux and (3.41 ± 0.02) × 10^8 n·cm^-2·s^-1 for the fast neutrons flux. These results can be used to verify and validate the nuclear reactor codes and its associated nuclear data libraries, besides, show how much effective it can be that the use of a neutron flux trap in the nuclear reactor core to increase the thermal neutron flux without increase the operation reactor power level. The thermal neutral flux increased 4.04 ± 0.21 times compared with the standard configuration of the reactor core. 展开更多
关键词 Thermal neutron flux flux trap activation detectors neutron spectrum zero power reactor.
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Application of a quantitative ^1H NMR method for rapid extraction and determination of the content of paeonol in Cynanchum paniculatum 被引量:3
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作者 Xuejiao Li Jianwei Dong +3 位作者 Xiu Gao Guijun Li Junyou Shi Yanqing Zhang 《Journal of Chinese Pharmaceutical Sciences》 CAS CSCD 2020年第6期422-430,共9页
Cynanchum paniculatum(Bunge) Kitagawa is usually used as an herbal medicine for treating many diseases. Paeonol is the main active component, and its content is the key indicator for quality control of C. paniculatum.... Cynanchum paniculatum(Bunge) Kitagawa is usually used as an herbal medicine for treating many diseases. Paeonol is the main active component, and its content is the key indicator for quality control of C. paniculatum. In the present study, we developed a rapid, accurate and precise method for quantitation of paeonol in C. paniculatum using 1 H NMR spectra. The deuterated solvent of methanol-d4 enabled satisfactory separation of the signals to be integrated in 1 H NMR spectrum. H-6(δ 7.78) of 1 H NMR spectrum of C. paniculatum was selected as the feature signal for quantitation, and trimesic acid(TMA) was selected as an internal standard. Validation of the quantitative method was performed in terms of linearity, specificity, repeatability and stability. This is the first time to report quantitative 1 H NMR(qHNMR) applied to determine the content of paeonol in C. paniculatum and showed a wider linearity range than the reported quantitation of paeonol in others. The simple extraction of paeonol from C. paniculatum was rapid and will prompt the application of the developed method. This work implied that qHNMR represented a feasible alternative to HPLC-based methods for quantitation of paeonol in C. paniculatum, and it was suitable for the quality control of C. paniculatum. 展开更多
关键词 Cynanchum paniculatum Quantitative ^1H NMR PAEONOL Quantitative determination
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