摘要：
To realize the retrospective measurement of public dose levels after a nuclear emergency, the optically stimulated luminescence radiation dose -response characteristics of salt were studied, and the relationship between the salt optically stimulated luminescence signal and ionizing radiation dose was determined. The effects of natural light, storage time, and pre heating temperature on the salt optically stimulated luminescence signal were examined. The results show that salt as a photoluminescence dose measurement material has the advantages of convenient sampling, high through put, short detection time, wide dose range, and low detection limit. The study lays the technical foundation for achieving the public dose assessment of salt pulse photoluminescence.
期刊：
EUROPEAN PHYSICAL JOURNAL A,2023年59(6):1-12 ISSN：1434-6001
通讯作者：
Li, XH
作者机构：
[Luo, Song; Li, Xiao-Hua; Qi, Lin-Jing; Zhang, Dong-Meng; Li, XH] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[He, Biao] Cent South Univ, Coll Phys & Elect, Changsha 410083, Peoples R China.;[Chu, Peng-Cheng] Qingdao Univ Sci & Technol, Sch Math & Phys, Qingdao 266033, Peoples R China.;[Li, Xiao-Hua; Li, XH] Univ South China, Natl Exemplary Base Int Sci & Technol, Collaborat Nucl Energy & Nucl Safety, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua; Li, XH] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Equ, Hengyang 421001, Peoples R China.
通讯机构：
[Li, XH ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;Univ South China, Natl Exemplary Base Int Sci & Technol, Collaborat Nucl Energy & Nucl Safety, Hengyang 421001, Peoples R China.;Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Equ, Hengyang 421001, Peoples R China.;Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contro, Changsha 410081, Peoples R China.
摘要：
Based on the Santhosh formula (Nucl Phys A 825:159, 2009), considering the blocking effect of unpaired nucleons and the orbital angular momentum taken away by the emitted
$$\alpha $$
particle, we put forward an improved formula to evaluate
$$\alpha $$
decay half-lives for superheavy nuclei. Using this formula, we systematically investigate the
$$\alpha $$
decay half-lives of 141 nuclei ranging from Z = 96 to Z = 118 with the corresponding root-mean-square (rms) deviations being 0.319 , 0.619 and 0.388 for 41 even–even, 78 odd-A and 22 odd–odd nuclei, respectively. In addition, this improved formula is generalized to predict
$$\alpha $$
decay half-lives for 100 nuclei with Z = 117, 118, 119 and 120. For comparison, the predicted results obtained by using phenomenological formulae, semi-microscopic and/or microscopic models are also present. The corresponding predictions consistently indicate that N = 184 may be the next possible neutron magic number.
摘要：
In order to solve the problem of low accuracy of tool wear detection due to the poor quality of generated data under small sample problems, a deep learning model based on data enhancement and feature fusion is proposed. Firstly, in order to solve the problem that there is no quality evaluation standard in the training process of the traditional generative adversarial network (GAN), the K nearest neighbor algorithm is proposed to test the data generated by the GAN model for the second time. The improved GAN model can be automatically trained to get the optimal model according to the second test results. Secondly, in order to enhance the anti-interference effect of the model, a double-path parallel convolutional neural network (DPCNN) which combines with the characteristics of frequency domain and time-frequency domain is constructed to analyze the wear data. Furthermore, the hyperparameters of the model are optimized by Bayesian optimization algorithm (BOA). Finally, the effectiveness of this method is verified in the saw blade wear detection experiment. The results show that the performance of this model is better than other models, and the accuracy rate in the experimental detection reaches 100%.
作者机构：
[Zhang, Yu-Peng; Li, Xiao-Hua; Chen, Xun; Chen, X] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Watanabe, Akira] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.
通讯机构：
[Chen, X ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
摘要：
The differential cross sections of elastic proton-proton (pp) and proton-antiproton (pp<overline> ) scattering are studied in a holographic QCD model, considering the strong and Coulomb interaction in the Regge regime. Based on previous studies of strong interactions described in terms of Pomeron and Reggeon exchange, we add the contribution of Coulomb interaction described by photon exchange. We present the momentum transfer dependence of the contribution rates for each component, especially for the Coulomb-nuclear interference, which refers to the cross term between both interactions. For the adjustable parameters for the strong interaction, we can adopt the values determined in previous studies, and there are no extra adjustable parameters that need to be determined for the Coulomb interaction. It is presented that the resulting differential cross sections are consistent with the data for pp and pp<overline> scattering.
通讯机构：
[Fei Mao] S;[Cong-Zhang Gao] I;Institute of Applied Physics and Computational Mathematics, Beijing 100088, People's Republic of China<&wdkj&>School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
摘要：
The electronic stopping power of magnesium for protons and He ions is studied by a nonequilibrium approach based on real-time time-dependent density-functional theory combined with Ehrenfest molecular-dynamics simulation. The electronic stopping power of Mg for energetic protons and He ions is calculated, and the microscopic excitation mechanism for the inner 2p electron of Mg and its contribution to electronic stopping power is revealed. In the low-energy range, the velocity proportionality of the electronic stopping power of Mg for protons is displayed. The low-energy stopping power of Mg for He ions displays deviations from the velocity proportionality, which is ascribed to the electronic structure of He ions that enables an additional energy-loss channel due to charge exchange. Our calculated stopping power is in a quantitative agreement with the experimental data up to the stopping maximum, and the stopping power including also 2p-electron excitation is considerably improved compared to that with only the valence electron taken into account. Our results showed that the contribution of p-electron excitation to the electronic stopping is remarkable in the high-velocity regime. The scaling relationship root S alpha/SH = q alpha/qH can be extended to low velocities provided that the mean steady-state charge is employed instead of assuming fully ionized charges and considering also 2p-electron excitation of Mg.
作者机构：
[Xie, Chao; Yu, Tao] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Luo, Run; Luo, R] Univ South China, Sch Resource & Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Revankar, Shripad T.] Purdue Univ, Sch Nucl Engn, W Lafayette, IN 47907 USA.
通讯机构：
[Yu, T ; Luo, R ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;Univ South China, Sch Resource & Environm & Safety Engn, Hengyang 421001, Peoples R China.
关键词：
molten-salt reactor;control system design;nonlinear distributed-parameter model;stability analysis
摘要：
A molten-salt reactor (MSR), in which the nuclear waste can be separated and taken away from the liquid fuel through online chemical treatment, has remarkable advantages in safety and economics. To ensure the safe operation of an MSR plant, it is necessary to carry out a controller design and stability analysis of the whole system. In this work, a nonlinear distributed-parameter model of an MSR plant with a graphite-moderated liquid core was established and verified by the reference model. By applying a joint feedforward and feedback control strategy, the power controller and steam temperature controller were designed to adjust the plant load. The Nyquist criterion was used to assess the stability of the control system. The system responses to four different perturbations at the nominal power level were simulated, and the results show that the designed controllers have good reliability. In addition, the control performance was tested in two load change cases: a step load reduction and a linear load change. The dynamic response characteristics of the system parameters show that the developed control system based on the nonlinear distributed-parameter model is capable of fast and accurate regulation.
摘要：
Scandium (Sc) and zirconium (Zr) often co-exists with each other and are difficult to separate effectively due to their similar behavior during separation. Herein, a series of adsorbents were synthesized by vacuum impreg-nation method for the separation of Sc and Zr. The results show that the Trialkylphosphine oxide silica-based modified adsorbent (TRPO/SiO2-P) has excellent adsorption selectivity (SFSc/Zr = 3694). It has fast adsorption and elution kinetics with equilibrium obtained within 30 min, and the adsorption matches the pseudo-second-order kinetic model and Langmuir isotherm model. Fourier transform infrared spectrometer (FT-IR), x-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) analysis showed that Sc and Zr was successfully adsorbed mainly through binding with P = O in Trialkylphosphine oxide (TRPO). Stoichiometry of Sc or Zr extraction by TRPO shows that one Sc or Zr combines with two TRPO molecules. In addition, the results of column experiments show that the separation and recovery of Sc and Zr can be achieved in the adsorption and elution stages, respectively, where the purity of Sc reaches 99.3 %. It shows the great potential of TRPO modified adsorbent for practical application in Sc and Zr dynamic separation process.
作者：
Shi, Z. Y.;Yuan, Y.;Wang, W. P.;Ma, Y. Y.;Sun, X. Y.;...
期刊：
PHYSICS OF PLASMAS,2023年30(4):043107 ISSN：1070-664X
通讯作者：
W. P. Wang<&wdkj&>Y. Y. Ma
作者机构：
[Leng, Y. X.; Shi, Z. Y.; Wang, W. P.; Lin, N.; Sun, X. Y.] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech SIOM, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China.;[Yuan, Y.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Ma, Y. Y.] Natl Univ Def Technol, Coll Adv Interdisciplinary Studies, Changsha 410073, Peoples R China.;[Sun, X. Y.] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
通讯机构：
[W. P. Wang] S;[Y. Y. Ma] C;College of Advanced Interdisciplinary Studies, National University of Defense Technology , Changsha 410073, China<&wdkj&>State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS) , Shanghai 201800, China
摘要：
In this study, an extreme ultraviolet (EUV) conversion efficiency (CE) of 6.9% was obtained in simulation by controlling the delay between a picosecond pre-pulse and a main-pulse with a wavelength of 2 μm; this value is about 7.5% higher than the ns pre-pulse scheme of the EUV emission produced by a 2 μm laser-driven tin-droplet target. In the simulation, the tin droplet expanded into hollow spherical structures after irradiation with a picosecond pre-pulse laser. Notably, compared with a nanosecond pre-pulse, in this case, the density of the tin plasma was lower, and the expansion range was wider for the same delay. Therefore, ps pre-pulse can make the tin plasma reach the optimal state of EUV emission in a shorter delay. In both pre-pulse schemes, the CE value maintains a high value (>5.7%) within a certain delay range (800 ns) between pre-pulse and main-pulse. In this study, the FLASH radiation hydrodynamic code and FLYCHK atomic code were used to investigate the energy conversion and spectra. The results obtained can be potentially useful for EUV lithography under a two-pulse scheme.
通讯机构：
[Jinjia Cao] S;School of Nuclear Science and Technology, University of South China , Hengyang 421001, People's Republic of China
摘要：
The eigen equation of pitch-angle distribution derived from the slowing-down distribution equation with an energetic particle source term is solved by using the Legendre series expansion method. An iteration matrix is established when pitch-angle scattering terms become important. The whole pitch-angle region is separated into three parts, two passing regions, and one trapped area. The slowing-down distribution for each region is finally obtained. The method is applied to solve the slowing-down equations with source terms that the pitch-angle distribution is Maxwellian-like, neutral beam injection, and radial drifts. The distribution functions are convergent for each source with different pitch-angle distribution. The method is suitable for solving a kinetic equation that pitch-angle scattering collision is important.
通讯机构：
[Luo, W ] U;[Zhou, WM ] C;Univ South China, Sch Nucl Sci & Technol, Hengyang, Peoples R China.;China Acad Engn Phys, Laser Fus Res Ctr, Sci & Technol Plasma Phys Lab, Mianyang, Peoples R China.
关键词：
isomeric yield ratio;photoneutron reaction;laser-accelerated electron beam;effective gamma-ray energy;Ho-164m,Ho- g
摘要：
Introduction: An accurate knowledge of the isomeric yield ratio (IR) induced by the photonuclear reaction is crucial to study the nuclear structure and reaction mechanisms. 165Ho is a good candidate for the investigation of the IR since the Ho target has a natural abundance of 100% and the residual nuclide has a good decay property.Methods: In this study, the photoneutron production of Ho-164m,Ho- g induced by laser-accelerated electron beams is investigated experimentally. The gamma-ray spectra of activated Ho foils are off-line detected. Since the direct transitions from the Ho-164m are not successfully observed, we propose to extract the IRs of the Ho-164m,Ho- g using only the photopeak counts from the ground-state decay.Results: The production yields of Ho-164m,Ho- g are extracted to be (0.45 +/- 0.10) x 10(6) and (1.48 +/- 0.14) x 10(6) per laser shot, respectively. The resulting IR is obtained to be 0.30 +/- 0.08 at the effective gamma-ray energy of 12.65 MeV.Discussion: The present data, available experimental data, and TALYS calculations are then compared to examine the role of the excitation energy. It is found that besides the giant dipole resonance, the excitation energy effect also plays a key role in the determination of the IRs.
通讯机构：
[Yu, T ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
摘要：
Owing to their high miniaturization potential and strong natural circulation capability, lead-bismuth reactors have been widely employed for nuclear energy utilization as well as military and civilian applications. However, there is a need to optimize the design of these reactors. To solve the complex high-dimensional nonlinear single-/multiobjective optimization problem of leadbismuth reactors, we proposed a single-/multiobjective optimization method (termed as RBF-OLHS-NGA/NSGA II method) for optimizing the reactor core, which is based on the radial basis function (RBF) surrogate model (for prediction), orthogonal Latin hypercube sampling, niche genetic algorithm (for single-objective optimization), and nondominated sorting genetic algorithm (for multiobjective optimization). In view of this approach, the design optimization procedure of the lead-bismuth reactor based on RBF (DOPPLER-R) was developed, which combined the reactor Monte Carlo (RMC) code and the steadystate thermo-hydraulic analysis calculation (STAC) code to sample, predict, and optimize reactor core parameters. Furthermore, the single-/multiobjective optimization approach was verified by considering the core fuel loading and active zone volume of SPALLER-4 as the optimization objectives. The results show that the RBF surrogate model can accurately and rapidly predict the core characteristic parameters of lead-bismuth reactors. When compared to the value calculated using the RMC code, the relative error associated with the predicted effective multiplication factor (k(eff)) is within +/- 0.1%. Compared to the unoptimized values, the single-objective optimized fuel loading reduced by 400 kg, multiobjective optimized fuel loading decreased by 455-493 kg (optimization ratio of 78%-84%), and active zone volume reduced by 166362-182888 cm(3) (optimization ratio of 72%-79%). These results prove that the proposed optimization method is feasible, exhibits high efficacy, and can provide new technical ideas for single-/multiobjective optimization of multiphysics, multivariable, and multiconstraint lead-bismuth reactors.
期刊：
Sustainable Energy & Fuels,2023年7(2):398-408 ISSN：2398-4902
通讯作者：
Zhi Zou<&wdkj&>Longcheng Liu
作者机构：
[Bian, Xiaolei; Zou, Zhi; Liu, Longcheng] KTH Royal Inst Technol, Sch Engn Sci Chem Biotechnol & Hlth, Dept Chem Engn, S-10044 Stockholm, Sweden.;[Liu, Longcheng; Meng, Shuo] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Zhi Zou; Longcheng Liu] D;Department of Chemical Engineering, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, 10044 Stockholm, Sweden<&wdkj&>Department of Chemical Engineering, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, 10044 Stockholm, Sweden<&wdkj&>School of Nuclear Science and Technology, University of South China, Hengyang, China
摘要：
The generation of electricity from salinity difference energy between seawater and freshwater through a Capacitive Mixing (CapMix) system with solid electrodes was limited by intermittent energy production. In this study, a single-cell CapMix system using flow-electrode (F-CapMix) with a cross-chamber configuration was examined to produce electricity continuously from simulated seawater and freshwater. The effects of the flow-electrode electrolyte concentration, activated carbon loading, amounts of carbon black, and connected external resistance on the system performance were investigated. The results suggest that the system performance can be enhanced by increasing the activated carbon loading and carbon black amounts. Furthermore, to achieve the maximum power density of the system, the external resistance should be matched to the internal resistance. The maximum power density of the presented single-cell F-CapMix system was 74.3 mW m(-2), which was comparable to those of previous CapMix and F-CapMix systems. In addition, this study also reveals that using only carbon black as the flow electrode is capable of producing electricity continuously for long-term operation. In summary, these results indicate the potential of F-CapMix and provide developing directions for further optimization.
通讯机构：
[Yun Liao; Meng Wang] S;School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan 421001, China<&wdkj&>Hunan Key Laboratory for the Design and Application of Actinide Complexes, University of South China, Hengyang, Hunan 421001, China<&wdkj&>School of Nuclear Science and Technology, University of South China, Hengyang, Hunan 421001, China
摘要：
Radon is a significant background source in rare event detection experiments. Activated carbon (AC) adsorption is widely used for effective radon removal. The selection of AC considers its adsorption capacity and radioactive background. In this study, using self-developed devices, we screened and identified a new kind of low-background AC from Qingdao Inaf Technology Company that has very high Radon adsorption capacity. By adjusting the average pore size to 2.3 nm, this AC demonstrates a radon adsorption capacity of 2.6 or 4.7 times higher than Saratech or Carboact activated carbon under the same conditions.
摘要：
A numerical approach is devised to calculate the shear Alfvén continuum inside and outside magnetic islands in cylindrical and stellarator plasmas. Equations for an appropriate set of coordinates and the arising equations for the continuum are derived and implemented in the CONTI code. An experiment-oriented representation of the results is chosen to allow a radial localization of the modes and a comparison of different magnetic configurations. Comparison is made with results of earlier analytic work for validation. Agreement is good but more details of the spectrum, such as the generation of island induced gaps inside and outside the separatrix, are found. While the code is easily usable and can be applied to any magnetic equilibrium accessible with VMEC, the calculations are plagued with convergence issues close to the separatrix. A calculation for a realistic W7-X equilibrium with islands is done where the island width is estimated with the HINT code.
摘要：
In this paper, LaFe0.75Cr0.25O3 was synthesized by a citric acid combusting sol-gel method. The basic structural information is reflected by XRD. According to Mossbauer spectroscopy, the inhomogeneous distribution of Cr contributes to magnetic dilution, thus appearing the coexistence of singlet and sextet. Simultaneously, the rare superparamagnetic relaxation appears due to "critical superparamagnetism" caused by small magnetic clusters with intervening sizes. Oxygen vacancies of synthesized sample are also found. The DC magnetization curve reveals the magnetization reversal phenomenon, which is related to the competition between the Dzyaloshinsky-Moriya interaction (DMI) and the magnetic anisotropy belonging to single ions. At 300 K, LCFO reveals weak magnetism. No magnetic transition is observed below 400 K.
