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	1. Evaluation on correction factor for in-line X-ray phase contrast Computed Tomography
	Jin MingLi ,Huang Zhifeng ,Zhang Li ,Yin Hongxia ,Liu Yunfu,Wang Zhenchang ,Xiao Tiqiao
	Nuclear Science and Technology 06 March 2011
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	Abstract:X-ray in-line phase contrast computed tomography (CT) is an effective nondestructive tool, providing 3D distribution of the refractive index of weakly absorbing low-Z object with high resolution and image contrast, especially with high-brilliance third-generation synchrotron radiation sources. Modified Bronnikov's algorithm (MBA), one of the in-line phase contrast CT reconstruction algorithms, can reconstruct the refractive index distribution of a pure phase object with a single computed tomographic data set. The key idea of the MBA is to use a correction factor in the filter function to stabilize the behavior at low frequencies. In this paper, we evaluate the influences of the correction factor to the final reconstruction results of the absorption-phase-mixed objects with analytical simulation and actual experiments. The limitations of the MBA are discussed finally..
	TO cite this article:Jin MingLi ,Huang Zhifeng ,Zhang Li , et al. Evaluation on correction factor for in-line X-ray phase contrast Computed Tomography[OL].[ 6 March 2011] http://en.paper.edu.cn/en_releasepaper/content/4413752


	2. Stabilization of Airborne Gamma-Ray Spectra From NaI(Tl) Detector
	Qin Zhangjian,Wu Qifan,Cheng Jianping
	Nuclear Science and Technology 07 September 2009
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	Abstract:NaI(Tl) detectors are always used in Airborne Gamma-Ray Spectrometry. They have the advantages of being efficient for high-energy gamma rays and can be used without cooling. Due to both NaI(Tl) scintillator and photomultiplier tube being sensitive to temperature, spectral drift will occur responding to ambient temperature. An approach is presented to stabilize the NaI(Tl) spectral drift by covering thermal-protective coating on the surface of NaI(Tl) detectors to keep the ambient temperature constantly as far as possible, and by adjusting gain to stabilize the spectra in every incremental time. A new peak-seeking algorithm and a fast convergent algorithm for adjusting gain to stabilize spectra are set forth in the paper. Spectral drifting channels are less than 0.6 in 4 hours, and the quality of NaI(Tl) spectra is improved much, when this approach is used.
	TO cite this article:Qin Zhangjian,Wu Qifan,Cheng Jianping. Stabilization of Airborne Gamma-Ray Spectra From NaI(Tl) Detector[OL].[ 7 September 2009] http://en.paper.edu.cn/en_releasepaper/content/34987

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	3. Influence of Transition Region’s Thickness on Calculated Time and Precision in Regional Monte Carlo Dose Calculation
	Huaqing ZHENG,Song Gang,Li Gui,Meng Yao,Lan Haiyang,Hu Bitao,Wu Yican
	Nuclear Science and Technology 29 April 2009
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	Abstract:The purpose of this study was to explore the influence of transition region’s thickness on calculated time and precision in regional Monte Carlo dose calculation. Monte Carlo code DOSXYZnrc in the EGSnrc system was used to simulate the transport of particles in water phantom, calculate the dose distribution in water phantom with various transition regions’ thickness along and off the central axis. The results showed that along the direction of central axis, the decrease of transition region’s thickness could reduce the calculated time linearly; off the direction of central axis, there was a Gaussian attenuation relationship between transition region’s thickness and calculated time; still had the precision of the ROI(region of interested) been acceptable in clinic when enlarged ROI with reasonable transition region’s thickness. Thereby, in Monte Carlo dose calculation method, when replaced the whole phantom with a reasonable enlarged ROI, the precision of the ROI would be good enough comparing with the result of the whole phantom, while the calculated time would become shorter greatly.
	TO cite this article:Huaqing ZHENG,Song Gang,Li Gui, et al. Influence of Transition Region’s Thickness on Calculated Time and Precision in Regional Monte Carlo Dose Calculation[OL].[29 April 2009] http://en.paper.edu.cn/en_releasepaper/content/31813


	4. Monte Carlo studies of the Characteristics of Micromegas Detector
	Hu Bitao,Wang Wenxin,Zhang Yi,Yang Herun
	Nuclear Science and Technology 10 February 2009
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	Abstract:In order to understand gas detector behavior better, the simulation with Garfield was widely developed in many aspects. In this paper, the physical processes of electron drift and multiplication in Micromegas detector were studied using a 3D simulation. The gain and spatial resolution under different conditions were investigated and compared with experimental data. A good agreement found in the present work suggests that 3D simulation is a powerful tool for detector research and optimization.
	TO cite this article:Hu Bitao,Wang Wenxin,Zhang Yi, et al. Monte Carlo studies of the Characteristics of Micromegas Detector[OL].[10 February 2009] http://en.paper.edu.cn/en_releasepaper/content/28680


	5. Numerical simulation for space charge dominated beam transport
	Lü Jian-Qin
	Nuclear Science and Technology 02 February 2009
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	Abstract:To simulate the intense bunched beam transport, a computer program LEADS-3D has been developed. The particle trajectories are analyzed with the Lie algebraic method. Third order approximation of the trajectory solutions is made with space charge forces off, and second order approximation is made with space charge forces on. The particle distribution in the 3-D ellipsoid is uniform or Gaussian. Most of the conventional beam optics elements are incorporated in the code. The optimization procedures are provided to fit the beam lines to satisfy the given optical conditions.
	TO cite this article:Lü Jian-Qin. Numerical simulation for space charge dominated beam transport[OL].[ 2 February 2009] http://en.paper.edu.cn/en_releasepaper/content/28359


	6. The study of neutron CT with Micromegas as a neutron detector
	zhoujianrong,zhangyi,hubitao
	Nuclear Science and Technology 18 December 2008
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	Abstract:In this paper, the possibility using micromegas (Micro-Mesh Gaseous Structure) as neutron detector in 14 MeV neutron computed tomography (CT) is studied by simulation. The simulation results show that micromegas neutron detector has high spatial resolution and is a good candidate for neutron radiography. The three-dimensional images of plant roots in soil are successfully and clearly obtained by the 14 MeV neutron CT with micromegas as neutron detector. In the present simulation, MCNP is employed for 14MeV neutron transport in the sample and Matlab for the 3-D photograph reconstruction.
	TO cite this article:zhoujianrong,zhangyi,hubitao. The study of neutron CT with Micromegas as a neutron detector[OL].[18 December 2008] http://en.paper.edu.cn/en_releasepaper/content/26718


	7. Hydrogen absorption and desorption properties of titanium
	Yu Xiangqing ,Bian Hai ,Ge Qin ,Wang Wenxiu ,Yang Zhen ,Zhang Limin ,Liu Zhengmin
	Nuclear Science and Technology 18 November 2008
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	Abstract:The study on hydrogen absorption and desorption properties of titanium under an initial hydrogen pressure of 0.25 MPa at different temperature was fulfilled, the hydrogen absorption rate constant k value is 7.364×10-3s-1 under an initial hydrogen pressure of 0.25 MPa at 773 K. The depth profile of hydrogen in titanium was performed by secondary ion mass spectroscopy, the relative hydrogen content is invariable between about 700nm and 1250nm in titanium. The X-ray diffraction and scanning electron microscope studies on titanium hydride were performed, the TiH phase was found after hydrogen desorption of titanium at 773 K after heating for 5400 seconds.
	TO cite this article:Yu Xiangqing ,Bian Hai ,Ge Qin , et al. Hydrogen absorption and desorption properties of titanium[OL].[18 November 2008] http://en.paper.edu.cn/en_releasepaper/content/25808


	8. Deposition of Potential Energy in Solid by the Interaction of Slow Highly Charged Ions with Solid Surface
	Guixia Yang,Tieshan Wang,Shengjin Liu,Yuncheng Han,Liang Chen,Xiang Yang,Xiuyu Yang
	Nuclear Science and Technology 04 November 2008
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	Abstract:The defects on a highly oriented pyrolytic graphite (HOPG) surface induced by slow highly charged Arq+ ions with impact energy of 20-2000qeV are investigated with scanning probe microscopy (SPM). The average lateral size and height of nano-dots were obtained. Their dependency on the potential and kinetic energy of HCIs were discussed. A Coulomb Explosion (CE) model was applied to analysis nano-defect effect. According to the calculated results, the ratio of the potential energy of HCI deposited on the solid surface can be known. Besides, formation mechanism and height of the nano-dots are discussed.
	TO cite this article:Guixia Yang,Tieshan Wang,Shengjin Liu, et al. Deposition of Potential Energy in Solid by the Interaction of Slow Highly Charged Ions with Solid Surface[OL].[ 4 November 2008] http://en.paper.edu.cn/en_releasepaper/content/25380


	9. Experimental study on heavy ion single event effects in SOI SRAMs
	Li Yonghong,He Chaohui,Zhao Fazhan, Guo Tianlei,Liu Gang,Han Zhengsheng,Guo Gang,Liu Jiancheng, Teng rui, Hui Ning,Chen Quan
	Nuclear Science and Technology 03 September 2008
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	Abstract:64K silicon-on-insulator (SOI) SRAMs were exposed to different heavy ions, Cu, Br, I, Kr. Experiment results show that the heavy ion single event upset(SEU) threshold Linear Energy Transfer (LET) in the 64K SOI SRAMs is about 71.8 MeV.cm2/mg. According to the experimental results, the single-event upset rate（SEUR）in space orbits are calculated and they are at the order of 10-13 upset/(day.bit) .
	TO cite this article:Li Yonghong,He Chaohui,Zhao Fazhan, et al. Experimental study on heavy ion single event effects in SOI SRAMs[OL].[ 3 September 2008] http://en.paper.edu.cn/en_releasepaper/content/23714


	10. Conductance behavior inside single conical nanopore
	Guo Wei ,Xue Jianming ,Wang Yugang,Liu Qi
	Nuclear Science and Technology 13 November 2006
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	Abstract:We investigated the asymmetrical conductance behavior of a polymer based conical nanopore. The current rectification effect happened inside this negatively charged conical nanopore is influenced by the concentration and pH value of the electrolyte. Theoretical analysis and calculation based on Poisson-Nernst-Planck (PNP) equations were conducted to understand the mechanism of the asymmetrical conductance behavior. The difference in transmembrane current at opposite voltage bias is induced by the difference in ionic strength in external field. For pores with extremely tiny tip down to 2 nanometers, its rectification coefficients are particularly high. We attribute this effect to the overlap of the electrical double layer. In addition, we have also demonstrated the model calcium ions detector based on our conical nanopore system. It is sensitive to both pH values of the environmental solution and the concentration of the calcium ions presence, and, its resolution power is high.
	TO cite this article:Guo Wei ,Xue Jianming ,Wang Yugang, et al. Conductance behavior inside single conical nanopore[OL].[13 November 2006] http://en.paper.edu.cn/en_releasepaper/content/9501

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