المؤلفون: Chao Han, Yu Zhang, Zeen Yao, Chang-Qi Liu, Junrun Wang, Dong-Ying Huo, Xiao-Hou Bai, Ma Zhanwen, Kang Wu, Jianjin Zhou, Zheng Wei, Xu Yang

المصدر: Journal of Radioanalytical and Nuclear Chemistry. 330:1091-1099

مصطلحات موضوعية: Physics, Health, Toxicology and Mutagenesis, Public Health, Environmental and Occupational Health, Low activity, Alpha particle, Grid, Pollution, Analytical Chemistry, Computational physics, Nuclear Energy and Engineering, Ionization chamber, Radiology, Nuclear Medicine and imaging, Development (differential geometry), Spectroscopy

الوصف: A Frisch-grid Ionization Chamber (FGIC) for the measurement of low activity of alpha-particle emitters has been built. The design and performance are described in this paper. According to the Shockley–Ramo theorem and the experiment, the key parameter grid inefficiency was studied in detail. The experimental and calculated values of the correction factor are shown to be in good agreement. In the measurement of the alpha-activities of a 234,238U sample, the detection efficiency was investigated based on the Monte-Carlo method. Considering this influence, the activity of alpha-particle emitters was identified.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::0446f2c309c3ebfa5b816079949455f1Test
https://doi.org/10.1007/s10967-021-08007-0Test

المؤلفون: QiaoYue Jiang, Zheng Wei, Xing-Yu Liu, Yu Zhang, Xu Yang, Chao Han, Zeen Yao, Xiao-Hou Bai, Hang Zhang, Chang-Qi Liu, Junrun Wang, Dong-Ying Huo, JinQiu Peng, Kang Wu

المصدر: Science China Technological Sciences. 64:1940-1946

مصطلحات موضوعية: Materials science, Nuclear fuel, Fission, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Nuclear engineering, Nuclear Theory, General Engineering, Nuclear power, Neutron temperature, Quality (physics), Neutron generator, Excited state, General Materials Science, Neutron, Nuclear Experiment, business

الوصف: A reliable 235U enrichment uniformity detection system based on a compact D-D neutron generator is developed to detect the 235U enrichment uniformity of different fuel elements in the same nuclear fuel rod. The high-yield compact D-D neutron generator provides 2.45 MeV D-D neutrons, decelerated by a moderator to thermal neutrons or epithermal neutrons, thereby inducing 235U fission to produce highly excited state fission fragments that undergo de-excitation via γ-ray emission. The system detects the 235U enrichment uniformity of a nuclear fuel rod by measuring γ-rays and establishing a relationship between the γ-ray count rate and 235U enrichment in nuclear fuel. The proposed system yields a confidence probability of 99.99% for a relative 235U enrichment deviation of 10% and a neutron yield of 5 × 108 n/s, and the detection accuracy increases with increasing neutron yield. Furthermore, the developed system can satisfy quality control requirements for nuclear fuel production to promote the safe development of nuclear power.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::18632eec2c692695ed222c67184e188dTest
https://doi.org/10.1007/s11431-021-1893-5Test

المؤلفون: Shao-jie LIU, Qian WANG, Pan-pan WANG, Chang-qi LIU, Qi-jing ZHU, Zhao YANG

المصدر: JOURNAL OF NATURAL RESOURCES. 38:529

مصطلحات موضوعية: General Agricultural and Biological Sciences

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::3064630de7d14e78b9c31da69eed6f8dTest
https://doi.org/10.31497/zrzyxb.20230216Test

المؤلفون: Yu Zhang, Xu Yang, Chang-Qi Liu, Kang Wu, Chao Han, Yuan He, Qin Xie, Junrun Wang, Zheng Wei, Xing-Yu Liu, Zeen Yao, Chang Huang, Xiao-Dong Su, Dong-Ying Huo, Xiao-Jun Bao

المصدر: Chinese Physics C. 45:114104

مصطلحات موضوعية: Physics, Nuclear and High Energy Physics, Nuclear transmutation, Fission, Neutron emission, Nuclear Theory, Astronomy and Astrophysics, Actinide, Nuclear physics, Semi-empirical mass formula, Nuclear fission, Neutron, Nuclear Experiment, Instrumentation, Excitation

الوصف: The scission point model is improved by considering the excitation-dependent liquid drop model to calculate mass distributions for neutron-induced actinide nuclei fission. Excitation energy effects influence the deformations of light and heavy fragments. The improved scission point model shows a significant advance with regard to accuracy for calculating pre-neutron-emission mass distributions of neutron-induced typical actinide fission with incident-neutron-energies up to 99.5 MeV. The theoretical frame assures that the improved scission point model is suitable for evaluating the fission fragment mass distributions, which will provide guidance for studying fission physics and designing nuclear fission engineering and nuclear transmutation systems.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::3859715716ff8cfee762336b4d5ab04dTest
https://doi.org/10.1088/1674-1137/ac2298Test

المؤلفون: Zhang Yu, Jun-Run Wang, Chao Han, Chang-Qi Liu, Dapeng Xu, Wei Zheng, Lu Xiaolong, Xiao-Dong Su, Yao Ze'en

المصدر: EPJ Web of Conferences, Vol 239, p 05015 (2020)

مصطلحات موضوعية: Physics, 010308 nuclear & particles physics, Fission, QC1-999, Monte Carlo method, Nuclear Theory, Actinide, Kinetic energy, 01 natural sciences, Nuclear physics, Nuclear fission, Scientific method, 0103 physical sciences, Evaluated data, Neutron, 010306 general physics, Nuclear Experiment

الوصف: A global potential-driving model with well-determined parameters is proposed by uniting the empirical asymmetric fission potential and the empirical symmetric fission potential, which can precisely calculate the pre-neutron-emission mass distributions for neutron-induced actinide nuclei fission. Based on the developed potential-driving model, Monte-Carlo code calculates the characteristics of fission reaction process for neutron-induced 241 Am fission. Typical calculated results, including yields, kinetic energy distributions, fission neutron spectrum and decay γ-ray spectrum, are compared with experimental data and evaluated data. It shows that the Monte-Carlo calculated results agree quite well with the experiment data, which indicate that Monte-Carlo code with the developed potential-driving model can reproduce and predict the characteristics of fission reaction process at reasonable energy ranges. Given the well predictions on the characteristics of fission reaction process, Monte-Carlo code with the developed potential-driving model can guide for the physical design of nuclear fission engineering.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7401dbe2e892c55c7b82d136c33d8f30Test
https://www.epj-conferences.org/articles/epjconf/pdf/2020/15/epjconf_nd2019_05015.pdfTest

المؤلفون: Ma Zhanwen, W. S. Wu, Chao Han, Chang-Qi Liu, Junrun Wang, Huang Zhiwu, X. D. Su, Zheng Wei, Xiao-Hou Bai, Yong Yang, Xiao-Long Lu, Zeen Yao, W. M. Li, Dapeng Xu, Shuang-Jiao Zhang, Yu Zhang, S. H. Peng

المصدر: The European Physical Journal A. 55

مصطلحات موضوعية: Physics, Nuclear reaction, Nuclear and High Energy Physics, Neutron generator, Deuterium, Nuclear fusion, Neutron source, Neutron, Atomic physics, Nuclear Experiment, Beam (structure), Neutron temperature

الوصف: A high-intensity accelerator-based D-D/D-T fusion neutron source (ZF-400) with a thick adsorption target is designed with an intensity of $ 10^{13}$ n/s. A high-current microwave ion source is used to produce a large current deuteron beam, and neutrons are generated by irradiating the deuteron beam on a deuterium-adsorption target or tritium-adsorption target. According to the particle-in-cell (PIC) code, the length of the whole high-current D+ beam transport line is 500cm, the D+ beam transfer efficiency is up to 96%, and various components can match each other. On the rotating target, the D+ beam spot size is about 20.0 mm with energy of 450 keV. Based on the heat conduction theory, the thick adsorption rotating target with water-cooling can withstand the D+ ions beam with 450 kV/50 mA and ensure that the temperature is less than 200 °C. According to the multi-layer computing model, neutron energy spectra, angular distributions and yields for the thick target can be calculated with remarkable precision. The neutron energy spectra are non-mono-energetic neutrons for the ZF-400 neutron generator, the neutron angular distributions are anisotropic distributions, and they can provide neutrons with an intensity of $ 2.8\times 10^{11}$ n/s (D-D) and $ 1.4\times 10^{13}$ n/s (D-T), respectively, with the deuteron of 450 keV/50 mA.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::b93488f3caa61cfd7f9d965566aea0aaTest
https://doi.org/10.1140/epja/i2019-12848-5Test

المؤلفون: Shuang-Jiao Zhang, Yu Zhang, Zheng Wei, Zhi-Jie Hu, Zeen Yao, Qin Xie, Chao Han, Zhi-Ming Hu, Xu Yang, Dong-Ying Huo, Xiao-Hou Bai, Chang-Qi Liu, Junrun Wang, Chang Huang, Kang Wu

المصدر: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 1006:165407

مصطلحات موضوعية: Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Monte Carlo method, Detector, Gamma ray, Scintillator, 01 natural sciences, Spectral line, 030218 nuclear medicine & medical imaging, Computational physics, 03 medical and health sciences, 0302 clinical medicine, Ultraviolet visible spectroscopy, Qualitative analysis, 0103 physical sciences, Scintillation counter, Instrumentation

الوصف: The EJ309 liquid scintillator detector and the developed gamma spectrum unfolding procedure are used to study the complex gamma spectra. The EJ309 liquid scintillator detector is calibrated by using measured response functions of the standard gamma sources 133Ba, 137Cs, and 60Co, which are verified by Monte Carlo simulations for detector calibration accuracy. A gamma spectra unfolding procedure is developed based on the One-fold Gold algorithm, which is used for unfolding simulated complex gamma spectra, experimentally measured response function of 133Ba and 137Cs, and composed complex gamma spectra using measured response function of 133Ba and 137Cs with different relative intensities (RI). The data of unfolded gamma-ray spectra are compared with the standard data. The results show that the EJ309 liquid scintillator detector and the developed gamma spectra unfolding procedure can quantitative and qualitative analysis of complex gamma spectra with reasonable accuracy.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::1bef218e5dba3bd87b6da2b7b92b3e21Test
https://doi.org/10.1016/j.nima.2021.165407Test

المؤلفون: Dong-Ying Huo, Chang-Qi Liu, Xiao-Hou Bai, Kai Zhang, Shuang-Jiao Zhang, Rui Guo, Yu Zhang, Chao Han, Chang Huang, Kang Wu, Yan-Yan Ding, Zhi-Yong Deng, Zeen Yao, Qin Xie, Zhi-Jie Hu, Yang-Bo Nie, Zhi-Ming Hu, Zheng Wei

المصدر: Chinese Physics C. 45:024002

مصطلحات موضوعية: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Branching fraction, Neutron emission, chemistry.chemical_element, Astronomy and Astrophysics, 01 natural sciences, Neutron temperature, chemistry, Deuterium, Excited state, 0103 physical sciences, ComputingMethodologies_DOCUMENTANDTEXTPROCESSING, Neutron, Beryllium, Atomic physics, 010306 general physics, Ground state, Instrumentation

الوصف: Novel measurements of the neutron energy spectra of the 9Be(d,n)10B reaction with a thick beryllium target are performed using a fast neutron time-of-flight (TOF) spectrometer for the neutron emission angles and , and the incident deuteron energies are 250 and 300 keV, respectively. The neutron contributions from the 9Be(d,n)10B reaction are distributed relatively independently for the ground state and the first, second, and third excited states of 10B. The branching ratios of the 9Be(d,n)10B reaction for the different excited states of 10B are obtained for the neutron emission angles and , and the incident deuteron energies are 250 and 300 keV, respectively. The branching ratio of the 9Be(d,n)10B reaction for the third excited state decreases with increase in the incident deuteron energy, and the branching ratios for the ground state and the second excited state increase with increase in the neutron emission angle.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::b7f5ff8943e20ab6985071eebee7a0d6Test
https://doi.org/10.1088/1674-1137/abce13Test

المؤلفون: Xiao-Long Lu, Chang-Qi Liu, Junrun Wang, Zimin Zhang, Ma Zhanwen, Zeen Yao, Xiao-Hou Bai, Yu Zhang, Zheng Wei, Huang Zhiwu

المصدر: Nuclear Science and Techniques. 30

مصطلحات موضوعية: Nuclear and High Energy Physics, Materials science, 010308 nuclear & particles physics, 01 natural sciences, Secondary electrons, Ion, Magnetic field, Nuclear Energy and Engineering, Neutron generator, Deuterium, Physics::Plasma Physics, Secondary emission, Electric field, 0103 physical sciences, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics

الوصف: A compact D–D neutron generator, with a peak neutron yield of D–D reactions up to 2.48 × 108 n/s is being developed at Lanzhou University in China for application in real-time neutron activation analysis. During tests, the problem of back acceleration of secondary electrons liberated from the neutron production target by deuterium ions bombardment was encountered. In this study, an electric field method and a magnetic field method for suppressing secondary electrons are designed and experimentally investigated. The experimental results show that the electric field method is superior to the magnetic field method. Effective suppression of the secondary electrons can be achieved via electrostatic suppression when the bias voltage between the target and the extraction-accelerating electrode is > 204 V. Furthermore, the secondary electron emission coefficient for the mixed deuterium ion (D1+, D2+, and D3+) impacting on molybdenum is estimated. In the deuterium energy range of 80–120 keV, the estimated secondary electron emission coefficients are approximately 5–5.5 for the mixed deuterium ion glancing incidence of 45° and approximately 3.5–3.9 for the mixed deuterium ion normal incidence.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::81e72fa9a46cd6fa2f4eca7a365bcd92Test
https://doi.org/10.1007/s41365-019-0596-0Test

المؤلفون: Quan Feng Li, Yu Fa Xu, Chang Qi Liu, Jin Hua Bian

المصدر: Applied Mechanics and Materials. 734:816-821

مصطلحات موضوعية: Motor efficiency, business.industry, engineering, Control engineering, General Medicine, engineering.material, business, Super efficiency, Automotive engineering, Finite element method, Induction motor, Electrical steel

الوصف: In order to increase the cost and material conditions as little as possible for improving the efficiency of the motor, and reduce the losses of the motor. This paper have YE3-132S-6X3 super-efficient motor loss analysis first. According to the characteristics of its loss analysis, this paper change the motor slot coordination, and through the finite element analysis, further has carried on the design of slot type and winding. Finally, in order to further reduce iron loss, this paper uses the new type of silicon steel, and then by comparing with the finite element analysis and experimental tests found YE3-132S-6X3 motor efficiency have achieved the purpose of the ultra-super efficient, and other performance parameters can also meet the requirements.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::1fbb2f5bec9cbfd97c9930a0fd5baa07Test
https://doi.org/10.4028/www.scientific.net/amm.734.816Test