作者：
Lin Jun*;Liu Wei;Xu Zhong-Yang;Li Yan;Bao Liang-Man;...
期刊：
中国物理C,2009年33(11):1006-1009 ISSN：1674-1137
通讯作者：
Lin Jun
作者机构：
[Lin Jun; Li Yu-Lan; Liu Wei; Li Yan; Yu Xiao-Han; Bao Liang-Man] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China.;[Xu Zhong-Yang] Univ S China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[He Wei; Chen Dong-Liang] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.
摘要：
The characteristics of daytime and nighttime suburbs PM2.5 in Shanghai were analyzed by synchrotron based X-ray fluorescence during the period of October, 2006 and November, 2007. The mass concentrations of nighttime PM2.5 was approximately two times that of daytime PM2.5. Some elements, such as Zn, Cu, Mn, Cl were found enriched at night. The local sources might have significant contribution to the nighttime PM2.5 pollutions.
摘要：
The intercomparison measurements with Tn-Rn discriminative monitor were conducted at the Radon Laboratory of Nanhua University. The intercomparison results indicates that the Tn-Rn discrimination of most monitors (including the solid-state nuclear track detector of participant A and participant B, continuous monitors of RAD7 and RTM2100) keeps well in a wide range of the ratio of Tn to Rn. There are great differences of Tn measurement results among RAD7, RTM2100 and reference instrument. The discussion on the reason of these differences reveals the necessity of improvement on monitor calibration, Tn source make and the necessity of more international intercomparisons.
期刊：
Journal of the Chilean Chemical Society,2008年53(3):1588-1593 ISSN：0717-9707
通讯作者：
Wu, Yaxin
作者机构：
[Wen, Songnian; Nie, Changming; Jiang, Saihong; Wu, Yaxin] Univ S China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.;[Wu, Rongyan] Univ S China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Wu, Yaxin] U;Univ S China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.
关键词：
Ionicity index;Stretching vibration frequency;Ultraviolet absorption spectrum;X=O bond
摘要：
In this paper, we find that stretching vibration frequencies of the X=O for series of R1R2C=O, (RO)(2)CO, RCO2H, a-halogenated aldehydes, cross-RONO and R2NNO can be described by the ionicity indices of X and O atoms as follows: v = aINI((O))+bINI((X))+c, where a, b, c are regression constants, and INI(X), INI(O) represent the ionicity indices of X and O atoms. The efficiency of the model is verified by high correlation coefficients in the range of 0.960-1.000. Similarly, the ultraviolet absorption energy of ketones can also be characterized by the ionicity indices of C and O as Delta E = aINI((O)) +bINI((C))+c. The predicted results are in good agreement with the experimental ones. Furthermore, the good stability and powerful predictive ability of those models are proved by LOO method.
摘要：
Airborne particulate matter (APM) was collected in coarse fraction and in PM2.5 during spring of 2002 in Beijing suburban sampling site by Gent SFU sampler. More attention has been paid to the special “events” such as dust, storm and haze. Taking advantage of the combination of thermal or epithermal neutron irradiation with Compton suppression spectrometer system, twenty elemental (Al, Si, Ca, K, Dy, Cu, I, In, Ba, W, Sn, Sb, As, Ti, Br, V, Mn, Cl, Na, Zn) concentration were determined. Among them, several key trace elements that cannot be accomplished by the traditional neutron activation analysis (NAA) were determined. The analysis of trace elemental concentration in PM2.5 shows that the anthropogenic elements such as As, In, Sn, Sb have different trends than crustal elements. The back-trajectories of the high concentration anthropogenic pollution elements revealed their source region. Six potential sources were resolved by positive matrix factorization (PMF), two area type and four source type, as soil, limestone quarry, crop burning and mixture of residue motor and coal burning sampling sites. Taking into account of everyday air particle back trajectories, source compositions together with source regions were also identified.
期刊：
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS,2004年215(1-2):16-26 ISSN：0168-583X
通讯作者：
Fan, S
作者机构：
[Fan, S] Inst Atom Energy, Beijing 102413, Peoples R China.;Shanghai Univ, Sch Environm & Chem Engn, Shanghai 200436, Peoples R China.;Nanhua Univ, Nuclear Technol Coll, Hengyang 421000, Peoples R China.;NW Univ Xian, Dept Phys, Xian 710006, Peoples R China.
通讯机构：
[Fan, S] I;Inst Atom Energy, Beijing 102413, Peoples R China.
关键词：
Evaporation model;Excitation function for (n,p) reaction;Exciton model
摘要：
A semiempirical approach for the excitation functions of (n,p) reaction was obtained on the basis of evaporation and exciton models with the energies range up to 20 MeV. Within the nuclide mass region of 23 less than or equal to A less than or equal to 209, the adjusted parameter of the semiempirical method was investigated, it has a strong dependence on (N - Z + 1)/A and the incident neutron energy. The predictions of the excitation functions for (n,p) reaction for different nuclei are in good agreement with the experimental data. (C) 2003 Elsevier B.V. All rights reserved.
期刊：
IEEE TRANSACTIONS ON NUCLEAR SCIENCE,2003年50(3):446-452 ISSN：0018-9499
通讯作者：
Leung, JKC
作者机构：
[Leung, JKC] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China.;Univ Hong Kong, Safety Off, Hong Kong, Hong Kong, Peoples R China.;Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China.;Nanhua Univ, Sch Nucl Sci & Technol, Hunan, Peoples R China.;Minist Hlth, Lab Ind Hyg, Beijing, Peoples R China.
通讯机构：
[Leung, JKC] U;Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China.
