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RISS 인기검색어
- 검색키워드
- 저자 : Jinda Chen (검색결과 4 건)
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The investigation of a new fast timing system based on DRS4 waveform sampling system
Jinda Chen,Chengming Du,Jinda Chen,Herun Yang,Jie kong,Haibo Yang,Peng Ma,Guozhu Shi,limin Duan,Zhengguo Hu 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.2
In the study of nuclear structure, the fast timing technique can be used to measure the lifetime of excitedstates. In the paper, we have developed a new fast timing system, which is made up of two LaBr3:Cedetectors and a set of waveform sampling system. The sampling system based on domino ring samplerversion 4 chip (DRS4) can digitize and store the waveform information of detector signal, with a smallervolume and higher timing accuracy, and the waveform data are performed by means of digital waveformanalysis methods. The coincidence time resolution of the fast timing system for two annihilation 511 keVg photon is 200ps (FWHM), the energy resolution is 3.5%@511 keV, and the energy linear response in thelarge dynamic range is perfect. Meanwhile, to verify the fast timing performance of the system, the152Gd-21þ state form bþ decay of 152Eu source is measured. The measured lifetime is 45.3(±5.0)ps, veryclose to the value of the National Nuclear Data Center (NNDC: 46.2((±3.9)ps). The experimental resultsindicate that the fast timing system is capable of measuring the lifetime of dozens of ps. Therefore, thesystem can be widely used in the research of the fast timing technology.
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A real-time sorting algorithm for in-beam PET of heavy-ion cancer therapy device
Ke, Lingyun,Yan, Junwei,Chen, Jinda,Wang, Changxin,Zhang, Xiuling,Du, Chengming,Hu, Minchi,Yang, Zuoqiao,Xu, Jiapeng,Qian, Yi,She, Qianshun,Yang, Haibo,Zhao, Hongyun,Pu, Tianlei,Pei, Changxu,Su, Hong Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.10
A real-time digital time-stamp sorting algorithm used in the In-Beam positron emission tomography (In-Beam PET) is presented. The algorithm is operated in the field programmable gate array (FPGA) and a small amount of registers, MUX and memory cells are used. It is developed for sorting the data of annihilation event from front-end circuits, so as to identify the coincidence events efficiently in a large amount of data. In the In-Beam PET, each annihilation event is detected by the detector array and digitized by the analog to digital converter (ADC) in Data Acquisition Unit (DAQU), with a resolution of 14 bits and sampling rate of 50 MS/s. Test and preliminary operation have been implemented, it can perform a sorting operation under the event count rate up to 1 MHz per channel, and support four channels in total, count rate up to 4 MHz. The performance of this algorithm has been verified by pulse generator and <sup>22</sup>Na radiation source, which can sort the events with chaotic order into chronological order completely. The application of this algorithm provides not only an efficient solution for selection of coincidence events, but also a design of electronic circuit with a small-scale structure.
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Wei Zhang,Cheng Qu,ChangqingMu,Fengqi Li,Chen Luo,Jinda Wang,RanWang 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.1
The Bemisia tabaci (Gennadius) cryptic species complex comprises very destructive insect pests for agricultural cropsworldwide. In China, the B. tabaciMED species (also known as biotype ‘Q’), has supplanted theMEAM1 species (biotype ‘B’) which is threatening agricultural production around the country. The new anthranilic diamide insecticide, cyantraniliprole, provides one novel step for themanagement of B. tabaci and the development of resistance to other insecticides. Ryanodine receptors of insect are the main target sites of the diamide insecticides. In this study, the full-length cDNA of a ryanodine receptor gene (BtRyR) was cloned and characterized from B. tabaci MED. The cDNAs of BtRyR contain a 15,369-bp open reading frame with encoding 5122 amino acids (GenBank ID: KY244091). BtRyR shares 76–83% identity with other insect RyR isoforms and 42–45% identity with vertebrate RyR isoforms. Spatial and temporal expression of BtRyR mRNA was at the highest relative level in pseudopupae and head, and at the lowest expression level in egg and abdomen. The expression levels of whole body BtRyR mRNAwere increased remarkably after insecticide-treatments of adults with cyantraniliprole at 0.01 to 1 mg/l. This structural and expression data on BtRyR provides the basis for further understanding the selective action of cyantraniliprole.
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Evaluation of energy correction algorithm for signals of PET in heavy-ion cancer therapy device
Niu, Xiaoyang,Yan, Junwei,Wang, Xiaohui,Yang, Haibo,Ke, Lingyun,Chen, Jinda,Du, Chengming,Zhang, Xiuling,Zhao, Chengxin,Kong, Jie,Su, Hong Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.1
In order to solve the contradiction between requirements of high sampling rate for acquiring accurate energy information of pulses and large amount of data to be processed timely, the method with an algorithm to correct errors caused by reducing the sampling rate is normally used in front-end read-out system, which is conductive to extract accurate energy information from digitized waveform of pulse. The functions and effects of algorithms, which mainly include polynomial fitting with different fitting times, double exponential function fitting under different sampling modes, and integral area algorithm, are analyzed and evaluated, and some meaningful results is presented in this paper. The algorithm described in the paper has been used preliminarily in a prototype system of Positron Emission Tomography (PET) for heavy-ion cancer therapy facility.
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