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| 1 | Study of time-domain digital pulse shaping algorithms for nuclear signals显示文摘With the development on high-speed integrated circuit,fast high resolution sampling ADC and digital signal processors are replacing analog shaping amplifier circuit.This paper firstly presents the numerical analysis and simulation on R-C shaping circuit model and C-R shaping circuit model.Mathematic models are established based on 1st order digital differential method and Kirchhoff Current Law in time domain,and a simulation and error evaluation experiment on an ideal digital signal are carried out with Excel VBA.A digital shaping test for a semiconductor X-ray detector in real time is also presented.Then a numerical analysis for Sallen-Key(S-K) low-pass filter circuit model is implemented based on the analysis of digital R-C and digital C-R shaping methods.By applying the 2nd order non-homogeneous differential equation,the authors implement a digital Gaussian filter model for a standard exponential-decaying signal and a nuclear pulse signal.Finally,computer simulations and experimental tests are carried out and the results show the possibility of the digital pulse processing algorithms. | ZHOU Jianbin ZHOU Wei LEI Jiarong TUO Xianguo ZHU Xing LIU Yi | 2012 | Nuclear Science and Techniques2012，23，3： | 34 |
| 2 | Unfolding the fast neutron spectra of a BC501A liquid scintillation detector using GRAVEL method显示文摘Accurate knowledge of the neutron energy spectra is useful in basic research and applications. The overall procedure of measuring and unfolding the fast neutron energy spectra with BC501 A liquid scintillation detector is described. The recoil proton spectrum of 241Am-Be neutrons was obtained experimentally. With the NRESP7 code, the response matrix of detector was simulated.Combining the recoil proton spectrum and response matrix, the unfolding of neutron spectra was performed by GRAVEL iterative algorithm. A MatLab program based on the GRAVEL method was developed. The continuous neutron spectrum of 241Am-Be source and monoenergetic neutron spectrum of D-T source have been unfolded successfully and are in good agreement with their standard reference spectra. The unfolded 241Am-Be spectrum are more accurate than the spectra unfolded by artificial neural networks in recent years. | CHEN YongHao CHEN XiMeng LEI JiaRong AN Li ZHANG XiaoDong SHAO JianXiong ZHENG Pu WANG XinHua | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，10： | 3 |
| 3 | Feasibility study of a SiC sandwich neutron spectrometer显示文摘 | Wu Jian Lei Jiarong Jiang Yong | 2013 | Nucl Instrum Meth A2013，708，： | 1 |
| 4 | Edge Ohmic Heating Experiment on HT-6M Tokamak显示文摘An improved ohmic confinement has been achieved on HT-6M tokamak after application of edge ohmic heating pulse which makes plasma current rapidly ramp up(0.4 ms)in a ramp rate of 12 MA/s.The improved ohmic confinement phase is characterized by(a)energy and particle confinement time increase,(b)non-symmetric increased density ne,(c)reduced Hαradiation,(d)increased Te and steeper Te,ne profile at the edge.The results from soft x-ray sawteeth inversion radius andβ_(p)+l_(i)/2 implied the anomalous current penetration. | GAO Xiang FAN Shuping LI Jian’gang MENG Yuedong LUO Jiarong YIN Fhxian ZENG Lei DING LianchengLIN Bili ZHANG Wei HAN Yuqing TONG Xingde LUO Lanchang GONG Xianzu JIANG Jiaguang WU Mingjun YIN Fei | 1994 | Chinese Physics Letters1994，11，3： | 0 |
| 5 | Optical Properties of Nb^+ Ions Implanted Sapphire before and after Annealing显示文摘Sapphire crystals with different orientations may cone from implantation of Nb+ ions under different conditions andsuccedent annealing at reducing atmosphere. Optical analysis results show that the main optical absorption bands layin the higher energy side of the spectra in the samples. The absorption curves were evaluated by Gaussian fitting basedon the F-type centers, which were confirmed by luminescence measurements. The results of Gaussian fitting showthat there were F center, F+ center, F2 center, F2+ center and F2+2 center in the Nb+ ions implanted sapphire. Afterannealing at different temperature, all types of color centers decreased, and the higher the annealing temperature,the more the defects decreased. Sub-micrometer particles were observed by the scanning electron microscopy. | Xinlian WANG Jiarong LEI Dezhi WANG Ningkang HUANG | 2005 | Journal of Materials Science & Technology2005，21，6： | 0 |
| 6 | Evaluation of Wheat Stripe Rust Resistance in Sichuan Province显示文摘Wheat stripe rust,caused by Puccinia striiformis Westend. f. sp. tritici Erikss.( Pst),is one of the most destructive diseases of wheat( Triticum aestivum L.) worldwide. Sichuan province plays an important role in stripe rust epidemic in China. To identify and evaluate wheat stripe rust resistance in Sichuan Province,134 wheat cultivars( lines) were inoculated with seven Pst races at seedling stage and adult stage. The results indicated that the resistance frequencies of wheat cultivars( lines) against seven races CYR31,Su11-7,CYR29,Su11-4,CYR32,CYR33 and V26 were 92. 4%,92. 5%,89. 3%,89. 4%,87. 3%,85. 0% and 82. 8%,respectively. Among 134 materials,76( 56. 0%) performed resistance against all tested races both in seedling and adult stages. The virulence of new pathogenic type V26 of Pst on wheat cultivars( lines) was stronger than the dominant races CYR32 and CYR33. All wheat cultivars( lines) were classified into three types according to analysis of resistance spectrum; 66. 4% of cultivars( lines) showed all-stage resistance,17. 9% were adult-plant resistance,and 15. 7% were susceptible. This indicated that although the overall resistance level of wheat cultivars( lines) in Sichuan Province was very high,the resistance type was simple. Therefore,it is important to identify new resistance genes and enhance resistance gene diversity. Meanwhile,pyramiding breeding of all-stage resistance gene and adult-plant resistance gene could be gradually developed,to achieve durable resistance of wheat cultivars(lines) against stripe rust in Sichuan Province. | Ren Yong Zhou Qiang Du Xiaoying He Yuanjiang Tao Ju Lei Jiarong Ou Junmei Zhou Fa Li Shengrong | 2016 | Plant Diseases and Pests2016，7，3： | 0 |
| 7 | Hemodynamics in renal arteries with partial coverage after endovascular aneurysm repair affected by renal orientations显示文摘Endovascular aortic repair(EVAR)has been increasingly used to treat abdominal aortic aneurysm(AAA)due to its lower mortality and shorter recovery time.However,the complications caused by renal artery coverage remained a major concern.In this study,three types of renal orientation and five types of partial renal coverage degree were adopted to numerically investigate the flow pattern,wall shear stress distribution,and blood perfusion during a cardiac cycle.The results show that as for the mild partial coverage(=<30%),the renal artery with a downward orientation suffered fewer unfavorable wall shear stress(WSS)distribution and more blood perfusion.It should be noted that the renal artery with horizontal orientation suffered more unfavorable WSS distribution.In terms of severe coverage(≥50%),all of the renal arteries displayed highly disturbed wall shear distribution,resulting in a significant reduction in blood perfusion It was interesting to note that the artery with an upward orientation had a smaller rate of reduction in blood perfusion.It can be concluded that as for the mild renal coverage after EVAR,renal arteries with downward orientation may have the advantage of reducing the possibility of renal occlusion,while renal arteries with horizontal orientation may increase the unfavorable wall shear distribution.On the other hand,as for serious coverage(≥50%),high risk of renal ischemia remains the main concern for all types of renal arteries due to highly disturbed wall shear distribution would significantly increase regardless of renal orientation. | Jun Wen Xinhui Liu Jianguo Lei Jiarong Wang Xiyang Chen Tinghui Zheng Ding Yuan | 2023 | Medicine in Novel Technology and Devices2023，，2： | 0 |
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