期刊：
Journal of Nuclear Materials,2025年608:155725 ISSN：0022-3115
通讯作者：
Xian Tang<&wdkj&>Guo-Dong Cheng
作者机构：
[Hongtao Zhang; Xian Tang] School of Nuclear Science and Technology, University of South China, Hengyang 421001, China;[Qiang Li; Guo-Dong Cheng] School of Computer, University of South China, Hengyang 421001, China;[Long Yan] Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
通讯机构：
[Xian Tang; Guo-Dong Cheng] S;School of Nuclear Science and Technology, University of South China, Hengyang 421001, China<&wdkj&>School of Computer, University of South China, Hengyang 421001, China
摘要：
The effect of temperatures ranging from 0 K to 1000 K on the positron lifetime of He- or H-vacancy complexes in 3 C -SiC are studied using first-principles calculations. We observed a steady decrease in the formation energy of H-vacancy complexes upon additional H introduction, in contrast to the variation tendency of formation energies seen in He-vacancy complexes. The intrinsic vacancies ( V Si , V C , and V Si + C ) exhibit different decrease in positron lifetime with the addition of He or H atoms, with the effect of He being more pronounced. Moreover, V C and its impurity-vacancy complexes are almost incapable of trapping delocalized positrons, with positron lifetimes close to those of the bulk. Positron lifetime calculations for the complexes show no significant temperature dependence from 0 K to 1000 K, except in the case of V C . The above results are interpreted by analysis of electron density, positron density, positron ground-state energy, and positron trapping energy analysis. The results provide a reference for future in-situ temperature-dependent positron lifetime experiments on impurity-vacancy complexes in 3 C -SiC.
The effect of temperatures ranging from 0 K to 1000 K on the positron lifetime of He- or H-vacancy complexes in 3 C -SiC are studied using first-principles calculations. We observed a steady decrease in the formation energy of H-vacancy complexes upon additional H introduction, in contrast to the variation tendency of formation energies seen in He-vacancy complexes. The intrinsic vacancies ( V Si , V C , and V Si + C ) exhibit different decrease in positron lifetime with the addition of He or H atoms, with the effect of He being more pronounced. Moreover, V C and its impurity-vacancy complexes are almost incapable of trapping delocalized positrons, with positron lifetimes close to those of the bulk. Positron lifetime calculations for the complexes show no significant temperature dependence from 0 K to 1000 K, except in the case of V C . The above results are interpreted by analysis of electron density, positron density, positron ground-state energy, and positron trapping energy analysis. The results provide a reference for future in-situ temperature-dependent positron lifetime experiments on impurity-vacancy complexes in 3 C -SiC.
作者：
Guo, Xi;Contreras, Miguel Angel Martin;Chen, Xun;Xiang, Dong
期刊：
中国物理C,2025年49(1):013104 ISSN：1674-1137
通讯作者：
Guo, X
作者机构：
[Guo, Xi; Chen, Xun; Xiang, Dong; Contreras, Miguel Angel Martin; Guo, X] Univ South China, Sch Nucl Sci & Technol, Hengyang 421000, Peoples R China.
通讯机构：
[Guo, X ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421000, Peoples R China.
关键词：
baryon spectroscopy;AdS/QCD;holographic QCD
摘要：
In this study, we discuss the description of neutral Sigma baryons with I(J(P))= 1(1/2(+))and I(J(P)) = 1(3/2(+)) using two bottom-up approaches: the deformed background and static dilaton models. In both models, we consider a non-linear Regge trajectory extension motivated by the strange nature of Sigma baryons. We find that both models describe these systems with an RMS error smaller than 10%. We also perform a configurational entropy calculation in both models to discuss hadronic stability.
作者机构：
[Zhang, Le; Cai, Fei-Yang] Hubei Normal Univ, Coll Phys & Elect Sci, Huangshi 435002, Peoples R China.;[Chen, Xun; Chen, X] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Chen, X ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
holographic QCD;hybrid potential;heavy quark
摘要：
Using gauge/gravity duality, we studied the exotic hybrid pseudopotentials at finite temperature and chemical potential. The Sigma hybrid meson can be described by a model including an object called "defect'' on a string linking the quark and antiquark. The Sigma(-)(u) hybrid potential at zero temperature and chemical potential was first proposed by Andreev and is perfectly described. In this study, we extended the aforementioned model to finite chemical potential and compared the separate distance and pseudopotentials of Sigma(+)(g) and Sigma u-. Unlike the Sigma(+)(g) ground state, the Sigma(-)(u) hybrid pseudopotentials no longer exhibit Coulomb-like behavior at short distances. In addition, temperature and chemical potential have a significant impact on the Sigma(-)(u) hybrid pseudopotentials. The screen distances and hybrid pseudopotentials of Sigma(-)(u) significantly decrease when increasing temperature and chemical potential. We represented the melting diagram of Sigma(+)(g) and Sigma(-)(u) in the T-mu plane and confirmed that the quark-antiquark pair in Sigma(-)(u) excited state is easier to melt than that in Sigma(+)(g) ground state.
期刊：
Journal of Environmental Radioactivity,2025年285:107669 ISSN：0265-931X
通讯作者：
Yanliang Tan
作者机构：
[Xinyue Yang; Huiying Li; Ruomei Xie; Shuaibin Liu; Shuai Yuan; Haibo Yi; Jiale Sun; Zhipeng Liu; Jiulin Wu; Shicheng Luo; Xianfa Mao; Chenxi Zu; Feng Xiao; Hongbo Xu; Hongzhi Yuan; Yanliang Tan] College of Physics and Electronic Engineering, Hengyang Normal University, Hengyang, Hunan Province, 421008, China;[Zhongkai Fan] School of Nuclear Science and Technology, University of South China, Hengyang, Hunan Province, 421001, China
通讯机构：
[Yanliang Tan] C;College of Physics and Electronic Engineering, Hengyang Normal University, Hengyang, Hunan Province, 421008, China
摘要：
The CR-39 solid-state nuclear track detector is a commonly used instrument for passively measuring radon. When using CR-39 to measure the radon exhalation rate from the surface of a medium, the effects of leakage are often overlooked. However, to a certain extent, system leakage can affect the accuracy of the measurement results. Therefore, the effect of different effective decay constants (including leakage) on the radon exhalation rate is worth studying. In this study, both theoretical and experimental validation methods were used to verify the effect of the uncertainty of the effective decay constant on the results of CR-39 measurements of radon exhalation rate from the medium surface. In the theoretical validation, different values of radon exhalation rate can be obtained by substituting different effective decay constants into the CR-39 formula for measuring radon exhalation rate while keeping the other variables constant. In the experimental validation, the radon exhalation rate in the same medium was measured using both CR-39 and RAD7. Since the traditional passive method (CR-39 solid-state nuclear track detector) cannot directly obtain the effective decay constant, the effective decay constant in the CR-39 measurement experiment was replaced by the effective decay constant value fitted from the RAD7 experimental data. The results showed that the radon exhalation rate value measured by CR-39 was much larger than that measured by RAD7. From the theoretical and experimental validation, it is concluded that the uncertainty of the effective decay constant has a significant effect on the radon exhalation rate measured by CR-39.
The CR-39 solid-state nuclear track detector is a commonly used instrument for passively measuring radon. When using CR-39 to measure the radon exhalation rate from the surface of a medium, the effects of leakage are often overlooked. However, to a certain extent, system leakage can affect the accuracy of the measurement results. Therefore, the effect of different effective decay constants (including leakage) on the radon exhalation rate is worth studying. In this study, both theoretical and experimental validation methods were used to verify the effect of the uncertainty of the effective decay constant on the results of CR-39 measurements of radon exhalation rate from the medium surface. In the theoretical validation, different values of radon exhalation rate can be obtained by substituting different effective decay constants into the CR-39 formula for measuring radon exhalation rate while keeping the other variables constant. In the experimental validation, the radon exhalation rate in the same medium was measured using both CR-39 and RAD7. Since the traditional passive method (CR-39 solid-state nuclear track detector) cannot directly obtain the effective decay constant, the effective decay constant in the CR-39 measurement experiment was replaced by the effective decay constant value fitted from the RAD7 experimental data. The results showed that the radon exhalation rate value measured by CR-39 was much larger than that measured by RAD7. From the theoretical and experimental validation, it is concluded that the uncertainty of the effective decay constant has a significant effect on the radon exhalation rate measured by CR-39.
作者机构：
[Changyang Wang; Yiren Wu; Zheng Li; Dong Xie] College of Nuclear Science and Technology, University of South China, Hengyang 421200, Hunan, PR China;[Hua Tang] Hunan Commercial Technician Institute, Zhuzhou 412000, Hunan, PR China;[Zeyi Lu] Guangxi Key Laboratory of Nuclear Physics and Nuclear Technology, College of Physics and Technology, Guangxi Normal University, Guilin, 541004, China;Zhuhai Tsinghua University Research Institute Innovation Center, 101 University Ave, Tangjiawan Zhuhai 519000, Guangdong, PR China;[Min Liu] College of Nuclear Science and Technology, University of South China, Hengyang 421200, Hunan, PR China<&wdkj&>Zhuhai Tsinghua University Research Institute Innovation Center, 101 University Ave, Tangjiawan Zhuhai 519000, Guangdong, PR China
通讯机构：
[Min Liu] C;College of Nuclear Science and Technology, University of South China, Hengyang 421200, Hunan, PR China<&wdkj&>Zhuhai Tsinghua University Research Institute Innovation Center, 101 University Ave, Tangjiawan Zhuhai 519000, Guangdong, PR China
摘要：
Mn 0.4 Zn 0.6 Fe 2-2 x Cr 2 x O 4 ( x = 0, 0.1, 0.2, 0.3, and 0.4) powder samples were prepared using the sol-gel method. X-ray powder diffraction (XRD) showed that all samples belong to the cubic spinel crystal system with an Fd-3m space group. The Scanning Electron Microscope (SEM) results show that the substitution of Cr leads to a reduction in grain size. The magnetothermal curves obtained from the Multi-Purpose Physical Property Measurement System (PPMS-9) indicated the presence of a spin glass state at low temperatures. With increasing Cr 3+ doping, the Curie temperature decreased and dropped below room temperature at x=0.4. The unsaturated hysteresis loops of the samples reveal the presence of anomalous paramagnetism below the Curie temperature. Mössbauer spectrum confirmed the coexistence of ferromagnetism and paramagnetism at room temperature. Mössbauer spectrum analysis indicates an interesting superparamagnetic cluster phenomenon caused by the presence of excess non-magnetic ions in the sample. Additionally, Cr doping altered the distribution of metal ions in the samples, causing fluctuations in the area of the superparamagnetic clusters, which verifies that this phenomenon is primarily driven by the magnetic behavior influenced by non-magnetic ions.
Mn 0.4 Zn 0.6 Fe 2-2 x Cr 2 x O 4 ( x = 0, 0.1, 0.2, 0.3, and 0.4) powder samples were prepared using the sol-gel method. X-ray powder diffraction (XRD) showed that all samples belong to the cubic spinel crystal system with an Fd-3m space group. The Scanning Electron Microscope (SEM) results show that the substitution of Cr leads to a reduction in grain size. The magnetothermal curves obtained from the Multi-Purpose Physical Property Measurement System (PPMS-9) indicated the presence of a spin glass state at low temperatures. With increasing Cr 3+ doping, the Curie temperature decreased and dropped below room temperature at x=0.4. The unsaturated hysteresis loops of the samples reveal the presence of anomalous paramagnetism below the Curie temperature. Mössbauer spectrum confirmed the coexistence of ferromagnetism and paramagnetism at room temperature. Mössbauer spectrum analysis indicates an interesting superparamagnetic cluster phenomenon caused by the presence of excess non-magnetic ions in the sample. Additionally, Cr doping altered the distribution of metal ions in the samples, causing fluctuations in the area of the superparamagnetic clusters, which verifies that this phenomenon is primarily driven by the magnetic behavior influenced by non-magnetic ions.
期刊：
SEPARATION AND PURIFICATION TECHNOLOGY,2025年358:130299 ISSN：1383-5866
通讯作者：
Qingliang Wang<&wdkj&>Fang Hu
作者机构：
[Zhao, Xu] School of Nuclear Science and Technology, University of South China, Hengyang 421001, Hunan, China;[Lei, Zhiwu; Li, Haoshuai; Su, Yucheng; Ali, Khan Muhammad Yaruq; Hu, Eming; Wang, Hongqiang; Wang, Qingliang; Hu, Fang] School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, Hunan, China;[Hou, Hongshuai] State Key Laboratory of Powder Metallurgy, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;[Sun, Yige] College of Resources and Environment, Anhui Agricultural University, Hefei 230000, Anhui, China;Non–ferrous Heavy Metal Pollution Control Equipment Hunan Engineering Laboratory, Science Environmental Protection Co., Ltd., Changsha 410000, Hunan, China
通讯机构：
[Qingliang Wang; Fang Hu] S;School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, Hunan, China
摘要：
With the sensitization of carbon neutrality, the efficient removal of beryllium from beryllium-containing wastewater has gained increasing research interest in the environmental field. In this study, carbon dots (CDs)/phosphonated chitosan hydrogel (PCH@CDs) are prepared by cross-linking nanometer CDs with phosphoric acid, calcium hydroxide, and chitosan. The doping with CDs increases the number of adsorption active sites (AAS) on PCH@CDs, thereby improving the removal rates of small molecular pollutants. The adsorption isotherm results show that the maximum amount of Be(II) adsorbed by PCH@CDs in neutral water is approximately 59.84 mg/g. The excellent adsorption of Be(II) by PCH@CDs can be attributed to the homogeneous dispersion of CDs in PCH@CDs, which results in significant exposure of CDs binding sites to Be(II). In addition, the surface of PCH@CDs contains many phosphate groups, including N–H and O–H, which have strong synergistic adsorption capacity for Be(II). In simulated wastewater, the Be(II) distribution coefficient of PCH@CDs is 6.56 × 10 5 mL/g, which is significantly higher than that of other coexisting ions. Furthermore, PCH@CDs can reduce the Be(II) concentration to less than 5 µg/L when treating Be(II)-containing solutions with an initial Be(II) concentration of less than 5 mg/L.
With the sensitization of carbon neutrality, the efficient removal of beryllium from beryllium-containing wastewater has gained increasing research interest in the environmental field. In this study, carbon dots (CDs)/phosphonated chitosan hydrogel (PCH@CDs) are prepared by cross-linking nanometer CDs with phosphoric acid, calcium hydroxide, and chitosan. The doping with CDs increases the number of adsorption active sites (AAS) on PCH@CDs, thereby improving the removal rates of small molecular pollutants. The adsorption isotherm results show that the maximum amount of Be(II) adsorbed by PCH@CDs in neutral water is approximately 59.84 mg/g. The excellent adsorption of Be(II) by PCH@CDs can be attributed to the homogeneous dispersion of CDs in PCH@CDs, which results in significant exposure of CDs binding sites to Be(II). In addition, the surface of PCH@CDs contains many phosphate groups, including N–H and O–H, which have strong synergistic adsorption capacity for Be(II). In simulated wastewater, the Be(II) distribution coefficient of PCH@CDs is 6.56 × 10 5 mL/g, which is significantly higher than that of other coexisting ions. Furthermore, PCH@CDs can reduce the Be(II) concentration to less than 5 µg/L when treating Be(II)-containing solutions with an initial Be(II) concentration of less than 5 mg/L.
期刊：
Reliability Engineering & System Safety,2025年256:110794 ISSN：0951-8320
通讯作者：
Zeng, WJ
作者机构：
[Li, Zheng; Chen, Chuqi; Li, Xiaoyu; Wang, Linna; Zeng, Wenjie; Zeng, WJ] Univ South China, Sch Nucl Sci & Technol, Hengyang City 421001, Peoples R China.
通讯机构：
[Zeng, WJ ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang City 421001, Peoples R China.
关键词：
Small pressurized water reactor;Nuclear power plant;Coordinated control system;Uncertainty quantification;Sensitivity analysis
摘要：
Parameter uncertainty is an inherent characteristic of control systems. To assess the impact of parameter uncertainty on the system, the dynamic performance assessment with uncertainty quantification and sensitivity analysis is proposed. The input sample set is obtained by Wilks' method and Latin hypercube sampling, then dynamic simulation and statistics are used to realize the uncertainty quantification of output parameters and the identification of key output parameters. The central composite design and second-order polynomial are used to build the agent model for the Sobol's method. Taking the small pressurized water reactor nuclear power plant as an example, a performance assessment platform of coordinated control system is developed through graphical user interface with fast load decrease conditions. The study shows that all the transient safety parameters except reactor core relative power and secondary-side outlet temperature of once-through steam generator (OTSG) satisfy the technical requirements, and the control system has a certain safety margin. Meanwhile, the adjustment time of reactor core relative power and secondary-side outlet temperature of OTSG is highly sensitive to primary-side flowrate of OTSG under the small range of variable load, and sensitive to the opening pressure of the steam dump valve under the large range of variable load.
Parameter uncertainty is an inherent characteristic of control systems. To assess the impact of parameter uncertainty on the system, the dynamic performance assessment with uncertainty quantification and sensitivity analysis is proposed. The input sample set is obtained by Wilks' method and Latin hypercube sampling, then dynamic simulation and statistics are used to realize the uncertainty quantification of output parameters and the identification of key output parameters. The central composite design and second-order polynomial are used to build the agent model for the Sobol's method. Taking the small pressurized water reactor nuclear power plant as an example, a performance assessment platform of coordinated control system is developed through graphical user interface with fast load decrease conditions. The study shows that all the transient safety parameters except reactor core relative power and secondary-side outlet temperature of once-through steam generator (OTSG) satisfy the technical requirements, and the control system has a certain safety margin. Meanwhile, the adjustment time of reactor core relative power and secondary-side outlet temperature of OTSG is highly sensitive to primary-side flowrate of OTSG under the small range of variable load, and sensitive to the opening pressure of the steam dump valve under the large range of variable load.
摘要：
In uranium(VI) (U(VI)) photoreduction, it is still a challenge to simultaneously degrade naturally coexisting organics and explore their impact on U(VI) photoreduction. Meanwhile, how to boost the separation and transport capability of photo-induced carriers is also a hot topic of current research. In this work, an ultrathin Bi 2 WO 6 /Bi 2 MoO 6 Z-type heterojunction was developed for the simultaneous treatment of U(VI) and its co-existing organics (tannic acid (TA)). Ultrathin interface engineering increased the contact area and shortened the transmission distance of photo-induced carriers. As a result, ultrathin Bi 2 WO 6 /Bi 2 MoO 6 exhibited highly efficient U(VI) removal rate (95.8 %) and TA degradation rate (97.2 %), which were much higher than those of bulk Bi 2 WO 6 /Bi 2 MoO 6 and single ultrathin Bi 2 WO 6 . In addition, the material possessed excellent stability and recyclability. Importantly, TA not only enhanced U(VI) removal by eliminating holes, but also favored U(VI) removal by serving as a bridge to the catalyst for U(VI) adsorption. Finally, a new mechanism was proposed.
In uranium(VI) (U(VI)) photoreduction, it is still a challenge to simultaneously degrade naturally coexisting organics and explore their impact on U(VI) photoreduction. Meanwhile, how to boost the separation and transport capability of photo-induced carriers is also a hot topic of current research. In this work, an ultrathin Bi 2 WO 6 /Bi 2 MoO 6 Z-type heterojunction was developed for the simultaneous treatment of U(VI) and its co-existing organics (tannic acid (TA)). Ultrathin interface engineering increased the contact area and shortened the transmission distance of photo-induced carriers. As a result, ultrathin Bi 2 WO 6 /Bi 2 MoO 6 exhibited highly efficient U(VI) removal rate (95.8 %) and TA degradation rate (97.2 %), which were much higher than those of bulk Bi 2 WO 6 /Bi 2 MoO 6 and single ultrathin Bi 2 WO 6 . In addition, the material possessed excellent stability and recyclability. Importantly, TA not only enhanced U(VI) removal by eliminating holes, but also favored U(VI) removal by serving as a bridge to the catalyst for U(VI) adsorption. Finally, a new mechanism was proposed.
通讯机构：
[Zeng, QY ; Xiao, Y ; Zhang, QS] U;Univ South China, Sch Resource & Environm & Safety Engn, Hengyang 421001, Peoples R China.;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
摘要：
Photocatalytic extraction of uranium from solution is one of the most promising technologies for uranium recovery. However, the presence of axial bonds between the two oxygen atoms in UO 2 2+ creates a high activation barrier for electron transfer, which hinders the reduction of UO 2 2+ , making it more challenging to reduce U( VI ) to U( IV ) with conventional photocatalysis. Herein, an ingenious strategy for the efficient removal of uranium from aqueous solutions, utilizing the photocatalytic hydrogen evolution reaction (HER) process, is proposed. In this process, a novel and highly stable bimetallic Co 9 Ni 1 -HOF was employed as a high HER performance photocatalyst, with an overpotential of 355 mV at 10 mA cm −2 . Benefiting from the excellent HER activity of Co 9 Ni 1 -HOF, efficient uranium removal (∼95.6%) within 60 min of illumination was achieved. The superior uranium removal performance could be ascribed to the enhanced HER performance due to the incorporation of Ni and the high affinity between U and OH*, resulting from the electron transfer between U and O and N, as confirmed by a series of experiments and density functional theory calculations. This work provides a new approach for the efficient removal of uranium using photocatalytic HER performance.
期刊：
Chemical Engineering Journal,2025年505:159469 ISSN：1385-8947
通讯作者：
Guibal, E;Hamza, MF
作者机构：
[Salih, Khalid A. M.; Zhou, Kanggen] Cent South Univ, Sch Met & Environm, Changsha 410083, Peoples R China.;[Guibal, Eric; Guibal, E] IMT Mines Ales, Polymers Compos & Hybrids PCH, Ales, France.;[Basiony, Ebtesam A.; Nassar, Lobna A.; Abdel-Rahman, Adel A. -H.] Menoufia Univ, Fac Sci, Chem Dept, Shibin Al Kawm 32511, Egypt.;[Ning, Shunyan; Wei, Yuezhou; Hamza, Mohammed F.; Hamza, MF] Univ South China, Sch Nucl Sci & Technol, Heng Yang 421001, Peoples R China.;[Wei, Yuezhou] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai, Peoples R China.
通讯机构：
[Hamza, MF ] U;[Guibal, E ] I;IMT Mines Ales, Polymers Compos & Hybrids PCH, Ales, France.;Univ South China, Sch Nucl Sci & Technol, Heng Yang 421001, Peoples R China.
关键词：
Carbamoylacetamide derivative grafted-chitosan;Enhancing U(VI) sorption by ion imprinting: improved uptake kinetics and selectivity;Comparative studies of ion-imprinting and non-imprinting sorbents;Remarkable stability after 10 cycles of sorption and desorption;Efficient uranium recovery from acidic ore leachate
摘要：
Uranium recovery from complex effluents requires the combination of different processes including metal sorption from low-concentration solutions containing several competitor metal ions. The design of efficient sorbents (BTC/CH(s), 2-(benzo[d]thiazol-2-yl)-N-carbamoyl acetamide grafted chitosan) that combine both high sorption capacity and high selectivity was achieved by adopting a dual strategy: (a) selecting efficient functional groups (amine, amide, thioester, and hydroxyl groups, in BTC/CH sorbents), and (b) adapting the arrangement of reactive groups appropriately to fit the specific shape of the complexes (ion-imprinting IP vs. non-ion-imprinted NIP materials). This dual strategy was applied to design a chitosan-based sorbent with high sorption capacity (≈1.5 mmol U g −1 ), fast uptake (equilibrium: 15–20 min), remarkable stability (limited loss of performances after 10 reuse cycles), and strong selectivity (tested on both equimolar multi-component solutions and pre-treated acid leachate), at moderately acidic pH (i.e., 4). Ion-templating strategy effectively improved selectivity by 5–10-folds. Uptake kinetics was fitted by the pseudo-first order rate equation, while the sorption isotherms were finely simulated by the Temkin equation. The sorption was exothermic, spontaneous, and the ion-templating allowed reaching more organized structure. The sorbent was highly selective against base metals, alkali and alkali-earth metals, but less efficient for the separation from thorium or rare-earth elements. The sorbent was successfully used for the recovery of residual uranyl from acidic leachates pre-treated with resins (Amberlite IRA-400 and DOWEX 50, for the recovery of U and rare-earth elements, respectively) and precipitation step (removal of Al(III)/Fe(III) at pH 4). The sorbents were characterized by elemental analysis, FTIR and XPS spectroscopy for analyzing the chemical structure of the materials and identifying their interactions with U(VI). Textural properties and pHpzc values were analyzed for supporting sorption behaviors.
Uranium recovery from complex effluents requires the combination of different processes including metal sorption from low-concentration solutions containing several competitor metal ions. The design of efficient sorbents (BTC/CH(s), 2-(benzo[d]thiazol-2-yl)-N-carbamoyl acetamide grafted chitosan) that combine both high sorption capacity and high selectivity was achieved by adopting a dual strategy: (a) selecting efficient functional groups (amine, amide, thioester, and hydroxyl groups, in BTC/CH sorbents), and (b) adapting the arrangement of reactive groups appropriately to fit the specific shape of the complexes (ion-imprinting IP vs. non-ion-imprinted NIP materials). This dual strategy was applied to design a chitosan-based sorbent with high sorption capacity (≈1.5 mmol U g −1 ), fast uptake (equilibrium: 15–20 min), remarkable stability (limited loss of performances after 10 reuse cycles), and strong selectivity (tested on both equimolar multi-component solutions and pre-treated acid leachate), at moderately acidic pH (i.e., 4). Ion-templating strategy effectively improved selectivity by 5–10-folds. Uptake kinetics was fitted by the pseudo-first order rate equation, while the sorption isotherms were finely simulated by the Temkin equation. The sorption was exothermic, spontaneous, and the ion-templating allowed reaching more organized structure. The sorbent was highly selective against base metals, alkali and alkali-earth metals, but less efficient for the separation from thorium or rare-earth elements. The sorbent was successfully used for the recovery of residual uranyl from acidic leachates pre-treated with resins (Amberlite IRA-400 and DOWEX 50, for the recovery of U and rare-earth elements, respectively) and precipitation step (removal of Al(III)/Fe(III) at pH 4). The sorbents were characterized by elemental analysis, FTIR and XPS spectroscopy for analyzing the chemical structure of the materials and identifying their interactions with U(VI). Textural properties and pHpzc values were analyzed for supporting sorption behaviors.
摘要：
This study, adhering to the Chinese standard GB/T 34008-2017, introduces a penalty-function-based particle swarm optimization algorithm and proposes an innovative approach for optimizing the aggregate mix ratio in radiation-shielding concrete. Utilizing barite, magnetite, and hematite as aggregates, the proposed optimization method yielded optimal mix ratios tailored for shielding 4.5 and 10 MeV neutrons while achieving target compressive strengths of 35 and 40 MPa. Geant4 simulations and experimental validations confirm that the optimized concrete offers robust neutron and gamma-ray shielding properties. Compared to conventional concrete, it achieves a 20.89% reduction in maximum neutron absorption dose and enhances the gamma-ray linear attenuation coefficient by up to 43.17%. The developed optimization method offers valuable guidance for shielding design in nuclear technology application laboratories.
摘要：
Ruthenium removal from complex solutions (highly saline effluents, seawater) is a critical challenge. Herein, the sorption capacity of chitosan/SiO2 composite beads (Ch-Si) for ruthenium nitrosyl is increased three-fold after phosphoramidate grafting (DPA-Ch-Si, 1.6 mmol Ru g−1) at pH 5. Uptake kinetics and sorption isotherms are compared at pH0: 3, 5 and 10; playing with the mode of agitation (mechanical, MA, vs. ultrasonic treatment, UT). The sorbent maintains good sorption capacities at pH 3 and 10. Uptake kinetics modeled by pseudo-first order rate equation is boosted by functionalization. For Ch-Si, sorption isotherms are modeled by the Langmuir or Sips equations (depending on the pH), while for DPA-Ch-Si the best fits depend on pH, temperature and mode of agitation. Ruthenium sorption is spontaneous and endothermic for the two sorbents. For DPA-Ch-Si, the sorption capacity increases from 1.62 to 1.70 mmol Ru g−1 to 2.23–2.32 mmol Ru g−1 (T increasing from 21 to 50 °C). Nitric acid solution (0.3 M) reveals highly efficient for back extraction; ruthenium is completely released in <15 min. The functionalized sorbent can be reused for a minimum of 10 cycles, with limited loss in performance. Phosphoramidation improves sorption selectivity for the treatment of equimolar multicomponent solutions (Na, Ca, Mg, Fe, Al, U, and Nd). The effect of pH on sorption selectivity is evaluated in simple multi-metal solutions and complex environment. In seawater, the selective recovery of ruthenium is favored at pH close to 10. These tests confirm the promising perspectives offered for ruthenium removal from complex environments. Physicochemical characterizations of the sorbent (and their modes of interaction with ruthenium nitrosyl) included SEM, BET, TGA, FTIR, XPS, and elemental analyses.
Ruthenium removal from complex solutions (highly saline effluents, seawater) is a critical challenge. Herein, the sorption capacity of chitosan/SiO2 composite beads (Ch-Si) for ruthenium nitrosyl is increased three-fold after phosphoramidate grafting (DPA-Ch-Si, 1.6 mmol Ru g−1) at pH 5. Uptake kinetics and sorption isotherms are compared at pH0: 3, 5 and 10; playing with the mode of agitation (mechanical, MA, vs. ultrasonic treatment, UT). The sorbent maintains good sorption capacities at pH 3 and 10. Uptake kinetics modeled by pseudo-first order rate equation is boosted by functionalization. For Ch-Si, sorption isotherms are modeled by the Langmuir or Sips equations (depending on the pH), while for DPA-Ch-Si the best fits depend on pH, temperature and mode of agitation. Ruthenium sorption is spontaneous and endothermic for the two sorbents. For DPA-Ch-Si, the sorption capacity increases from 1.62 to 1.70 mmol Ru g−1 to 2.23–2.32 mmol Ru g−1 (T increasing from 21 to 50 °C). Nitric acid solution (0.3 M) reveals highly efficient for back extraction; ruthenium is completely released in <15 min. The functionalized sorbent can be reused for a minimum of 10 cycles, with limited loss in performance. Phosphoramidation improves sorption selectivity for the treatment of equimolar multicomponent solutions (Na, Ca, Mg, Fe, Al, U, and Nd). The effect of pH on sorption selectivity is evaluated in simple multi-metal solutions and complex environment. In seawater, the selective recovery of ruthenium is favored at pH close to 10. These tests confirm the promising perspectives offered for ruthenium removal from complex environments. Physicochemical characterizations of the sorbent (and their modes of interaction with ruthenium nitrosyl) included SEM, BET, TGA, FTIR, XPS, and elemental analyses.
摘要：
This study successfully synthesized Mg 0.5 Ni 0.5 Fe 2- x Nd x O 4 ( x =0, 0.01, 0.03, 0.05) spinel ferrites using the sol-gel method. X-ray diffraction analysis revealed that doping with Nd 3+ enhanced lattice distortion, and a secondary NdFeO 3 phase emerged at higher concentrations. Mössbauer spectroscopy analysis revealed that Nd 3+ doping modified the distribution of metal cations within the samples and yielded theoretical values for the samples’ magnetic moments. Magnetic analysis indicated that magnetic parameters, including saturation magnetization, remanence, and coercivity, displayed irregular variations with increasing Nd 3+ concentration, peaking at x =0.03, while the presence of the NdFeO 3 secondary phase induced abnormal changes. These irregular variations may be attributed to the combined effects of microscopic magnetic mechanisms regulating the sample’s magnetic response, such as lattice structure, metal cation distribution, the Yafet-Kittel spin canting effect, and the presence of the NdFeO 3 secondary phase.
This study successfully synthesized Mg 0.5 Ni 0.5 Fe 2- x Nd x O 4 ( x =0, 0.01, 0.03, 0.05) spinel ferrites using the sol-gel method. X-ray diffraction analysis revealed that doping with Nd 3+ enhanced lattice distortion, and a secondary NdFeO 3 phase emerged at higher concentrations. Mössbauer spectroscopy analysis revealed that Nd 3+ doping modified the distribution of metal cations within the samples and yielded theoretical values for the samples’ magnetic moments. Magnetic analysis indicated that magnetic parameters, including saturation magnetization, remanence, and coercivity, displayed irregular variations with increasing Nd 3+ concentration, peaking at x =0.03, while the presence of the NdFeO 3 secondary phase induced abnormal changes. These irregular variations may be attributed to the combined effects of microscopic magnetic mechanisms regulating the sample’s magnetic response, such as lattice structure, metal cation distribution, the Yafet-Kittel spin canting effect, and the presence of the NdFeO 3 secondary phase.
作者机构：
[Qingsong Zhang; Weidi Qin; Chunlei Zhang] School of Resource & Environment and Safety Engineering, University of South China, Hengyang, 421001, China;[Meng Sun; Hui Yu] School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun, 130000, China;[Liangshu Xia] School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China;[Yang Xiao] School of Resource & Environment and Safety Engineering, University of South China, Hengyang, 421001, China<&wdkj&>School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China
通讯机构：
[Yang Xiao] S;School of Resource & Environment and Safety Engineering, University of South China, Hengyang, 421001, China<&wdkj&>School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China
摘要：
Multilayer ZnO nanoflowers constructed by many nanograins with highly exposed {0001} facet have been prepared. The grain size and exposed {0001} facet is adjusted by hydrothermal condition and citrate-assisted steric hindrance, respectively. Subsequently, the gas sensing performances of the as-prepared ZnO sensors with various hydrothermal temperatures and times were investigated. The detailedly sensing experiments demonstrated that when the hydrothermal temperature and time are 120 °C and 9h, respectively, the obtained ZnO nanoflower sensor (ZnO-120-9) possesses optimal response of 80.3 towards 100 ppm NO x gas concentration at 180 °C. Meanwhile, ZnO-120-9 exhibits excellent selectivity, rapid response and recovery time, and also shows an obvious response signal at 0.5 ppm NO x exposure, which manifests that the lower concentration detection is also attainable. The superior performance of ZnO-120-9 towards NO x is due to the highly exposed {0001} facet and the size comparable to Debye length. As a result, such structure is conducive to the adsorption of more oxygen species and significant reduction of resistance, and they improve the sensitivity of a sensor.
Multilayer ZnO nanoflowers constructed by many nanograins with highly exposed {0001} facet have been prepared. The grain size and exposed {0001} facet is adjusted by hydrothermal condition and citrate-assisted steric hindrance, respectively. Subsequently, the gas sensing performances of the as-prepared ZnO sensors with various hydrothermal temperatures and times were investigated. The detailedly sensing experiments demonstrated that when the hydrothermal temperature and time are 120 °C and 9h, respectively, the obtained ZnO nanoflower sensor (ZnO-120-9) possesses optimal response of 80.3 towards 100 ppm NO x gas concentration at 180 °C. Meanwhile, ZnO-120-9 exhibits excellent selectivity, rapid response and recovery time, and also shows an obvious response signal at 0.5 ppm NO x exposure, which manifests that the lower concentration detection is also attainable. The superior performance of ZnO-120-9 towards NO x is due to the highly exposed {0001} facet and the size comparable to Debye length. As a result, such structure is conducive to the adsorption of more oxygen species and significant reduction of resistance, and they improve the sensitivity of a sensor.
摘要：
We present new data on the
$$^{63}$$
Cu(
$$\gamma$$
, n) cross-section studied using a quasi-monochromatic and energy-tunable
$$\gamma$$
beam produced at the Shanghai Laser Electron Gamma Source to resolve the long-standing discrepancy between existing measurements and evaluations of this cross-section. Using an unfolding iteration method,
$$^{63}$$
Cu(
$$\gamma$$
, n) data were obtained with an uncertainty of less than 4%, and the inconsistencies between the available experimental data were discussed. The
$$\gamma$$
-ray strength function of
$$^{63}$$
Cu(
$$\gamma$$
, n) was successfully extracted as an experimental constraint. We further calculated the cross-section of the radiative neutron capture reaction
$$^{62}$$
Cu(n,
$$\gamma$$
) using the TALYS code. Our calculation method enables the extraction of (n,
$$\gamma$$
) cross-sections for unstable nuclides.
通讯机构：
[Zhang, S ; Chen, LW] A;[Chen, LW ] C;[Li, XX ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;Adv Energy Sci & Technol Guangdong Lab, Huizhou 516000, Peoples R China.
关键词：
Classical trajectory Monte Carlo;Heavy ion-water molecule collision;Inelastic cross sections
摘要：
Inelastic collisions are the dominant cause of energy loss in radiotherapy. In the energy range around the Bragg peak, single ionization (SI) and single-electron capture (SC) are the primary inelastic collisions that lead to energy loss. This study employs the classical trajectory Monte Carlo method to study the SI and SC processes of H
$$_{2}$$
O molecules using He
$$^{2+}$$
and C
$$^{6+}$$
projectiles in the energy range of 10 keV/u to 10 MeV/u. The total cross sections, single differential cross sections, impact parameter dependence of SI and SC, and fragmentation cross sections were investigated. Results illustrate that the cross section for SI is the highest when the projectile energy is close to the Bragg peak energy. When the projectile energy is below the Bragg peak energy, the ionized electrons in the forward direction dominate, and the removal of electrons can be associated with large impact parameters. As the projectile energy increases, the emission angle of the electrons gradually transitions from small angles (
$$0^{\circ} \sim 30^{\circ}$$
) to large angles (
$$60^{\circ} \sim 120^{\circ}$$
), and the removal of electrons is associated with small impact parameters. The energy distributions of the ionized electron are similar when the projectile energy is equal to, below or above the Bragg peak energy. The fragmentation cross sections after SI and SC in the energy range around the Bragg peak were also estimated.
期刊：
Journal of High Energy Physics,2025年2025(2):1-27 ISSN：1029-8479
通讯作者：
Chen, X
作者机构：
[Chen, Xun; Chen, X] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Chen, Xun; Chen, X] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Huang, Mei] Univ Chinese Acad Sci, Sch Nucl Sci & Technol, Beijing 100049, Peoples R China.
通讯机构：
[Chen, X ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.
关键词：
Gauge-Gravity Correspondence;Phase Diagram or Equation of State;Quark-Gluon Plasma
摘要：
QCD phase diagram in the T - mu plane and the equation of state for pure gluon, 2-flavor, 2+1-flavor systems, and 2+1+1-flavor systems have been investigated using the Einstein-Maxwell-Dilaton (EMD) framework at finite temperature and chemical potential. By inputting lattice QCD data for the equation of state and baryon number susceptibility at zero chemical potential into holographic model, all the parameters can be determined with the aid of machine learning algorithms. Our findings indicate that the deconfinement phase transition is of first order for the pure gluon system with critical temperature Tc = 0.265 GeV at vanishing chemical potential. The phase transition for the 2-flavor, 2+1-flavor systems, and 2+1+1-flavor systems are crossover at vanishing chemical potential and first-order at high chemical potential, and the critical endpoint (CEP) in the T - mu plane locates at (mu Bc\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {\mu}_B<^>c $$\end{document} = 0.46 GeV, Tc= 0.147 GeV), (mu Bc\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {\mu}_B<^>c $$\end{document} = 0.74 GeV, Tc = 0.094 GeV), and (mu Bc\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {\mu}_B<^>c $$\end{document} = 0.87 GeV, Tc = 0.108 GeV), respectively. Additionally, the thermodynamic quantities of the system for different flavors at finite chemical potential are presented in this paper. It is observed that the difference between the 2+1-flavor and 2+1+1-flavor systems is invisible at vanishing chemical potential and low temperature. The location of CEP for 2+1+1-flavor system deviates explicitly from that of the 2+1-flavor system with the increase of chemical potential. Both 2+1-flavor and 2+1+1-flavor systems differ significantly from the 2-flavor system. Moreover, at zero temperature, the critical chemical potential is found to be mu B = 1.1 GeV, 1.6 GeV, 1.9 GeV for the 2-flavor, 2+1-flavor and 2+1+1-flavor systems, respectively.
作者机构：
[Ye, Fengjiao; Tang, Xian; Xie, Xiangmin; Xu, Meicheng; Wu, Haibiao] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Huang, Dong] Hunan Univ, Coll Mat Sci & Engn, Hunan Prov Key Lab Adv Carbon Mat & Appl Technol, Changsha 410082, Peoples R China.;[Huang, Dong] Hunan Toyi Carbon Mat Technol Co Ltd, Hunan Prov Engn Res Ctr High Performance Pitch bas, Changsha 410205, Peoples R China.;[Cao, Xingzhong; Xie, Xiangmin; Cao, XZ; Xu, Meicheng] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.;[Cao, Xingzhong; Cao, XZ] Henan Acad Sci, Ctr High Energy Phys, Zhengzhou 450046, Peoples R China.
通讯机构：
[Tang, X ] U;[Cao, XZ ] C;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.;Henan Acad Sci, Ctr High Energy Phys, Zhengzhou 450046, Peoples R China.
摘要：
Carbon/carbon (C/C) composites are critical structural materials for advanced reactors, including molten salt reactors. However, the irradiation mechanisms, particularly the differences in irradiation-induced damage between fibers and matrices, remain inadequately understood. In this study, the irradiation behavior of mesophase-pitch-based carbon-fiber-reinforced carbon matrix composites was investigated under 1.8-MeV Ar-ion irradiation at a dose of 3 × 1016 ions/cm2 at room temperature. Following irradiation, both the carbon fiber and matrix underwent amorphization and exhibited significant changes in surface morphology, the matrix exhibiting pronounced volumetric shrinkage compared to the fiber. Additionally, irradiation resulted in the degradation of the ordered graphite layers and closure of the initial cracks within the fiber and matrix. Notably, the matrix contained a greater number of initial cracks and crack closure was more pronounced during irradiation compared to the fiber. The differential shrinkage observed between the fiber and matrix is primarily attributed to the differences in the irradiation-induced closure behavior of the initial cracks in each component. These findings provide insights into enhancing the irradiation performance of C/C composites by adjusting the microstructural composition of the fiber and matrix.
Carbon/carbon (C/C) composites are critical structural materials for advanced reactors, including molten salt reactors. However, the irradiation mechanisms, particularly the differences in irradiation-induced damage between fibers and matrices, remain inadequately understood. In this study, the irradiation behavior of mesophase-pitch-based carbon-fiber-reinforced carbon matrix composites was investigated under 1.8-MeV Ar-ion irradiation at a dose of 3 × 1016 ions/cm2 at room temperature. Following irradiation, both the carbon fiber and matrix underwent amorphization and exhibited significant changes in surface morphology, the matrix exhibiting pronounced volumetric shrinkage compared to the fiber. Additionally, irradiation resulted in the degradation of the ordered graphite layers and closure of the initial cracks within the fiber and matrix. Notably, the matrix contained a greater number of initial cracks and crack closure was more pronounced during irradiation compared to the fiber. The differential shrinkage observed between the fiber and matrix is primarily attributed to the differences in the irradiation-induced closure behavior of the initial cracks in each component. These findings provide insights into enhancing the irradiation performance of C/C composites by adjusting the microstructural composition of the fiber and matrix.
期刊：
Nuclear Engineering and Design,2025年433:113872 ISSN：0029-5493
通讯作者：
Liu, HL
作者机构：
[Liu, Hongliang; Ouyang, Zigen; Liu, HL; Liu, Wangheng] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Zeng, Wenjie] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Liu, Hua] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Liu, HL ] U;Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.
关键词：
Adaptive learning observer;Radial basis function neural networks;Fixed-time fault-tolerant control;Control rod drive mechanism faults;Load following for modular high-temperature;gas-cooled reactor
摘要：
Load following of the Modular High-Temperature Gas-Cooled Reactor (MHTGR) under Control Rod Drive Mechanism (CRDM) faults and disturbances remains a major challenge. This paper focuses on proposing a fixed-time fault-tolerant control method for this issue without considering the sensitivities associated with parameter setting. Firstly, to reconstruct some unmeasurable states of the MHTGR and the values of CRDM faults, an adaptive learning observer is established. Based on the learning characteristic of Radial Basis Function Neural Networks (RBFNN), the lumped uncertainties can be approximated. And then a fixed-time fault-tolerant controller is developed to ensure that the actual load output of the MHTGR actually tracks the expected output power within a fixed time, which can be determined through the system and controller parameters. Finally, simulations under two operational conditions demonstrate the control method is effective and feasible to the MHTGR system under disturbance and CRDM faults.
Load following of the Modular High-Temperature Gas-Cooled Reactor (MHTGR) under Control Rod Drive Mechanism (CRDM) faults and disturbances remains a major challenge. This paper focuses on proposing a fixed-time fault-tolerant control method for this issue without considering the sensitivities associated with parameter setting. Firstly, to reconstruct some unmeasurable states of the MHTGR and the values of CRDM faults, an adaptive learning observer is established. Based on the learning characteristic of Radial Basis Function Neural Networks (RBFNN), the lumped uncertainties can be approximated. And then a fixed-time fault-tolerant controller is developed to ensure that the actual load output of the MHTGR actually tracks the expected output power within a fixed time, which can be determined through the system and controller parameters. Finally, simulations under two operational conditions demonstrate the control method is effective and feasible to the MHTGR system under disturbance and CRDM faults.
摘要：
The design of complex reactor shielding structures requires consideration of neutron and photon radiation levels in various regions, as well as trade-offs in weight, volume, and cost, leading to a substantial increase in shielding calculation parameters and optimization objectives. This study introduces a high-dimensional multi-objective shielding optimization method based on a multi-parameter shielding calculation surrogate model, with significant improvements to the FCNN-NSGAIII shielding optimization method which integrates a neural network with a genetic algorithm. For the optimization of complex reactor shielding structures under diverse source item energy spectra, the multi-parameter surrogate model achieves a prediction error reduction of an order of magnitude to 3.65% compared to traditional neural networks. Furthermore, the k_NSGAIII optimization algorithm, enhanced with a knee-point strategy, demonstrates a greater relative set coverage indicator than the NSGAIII algorithm, indicating its ability to identify superior shielding design schemes.
The design of complex reactor shielding structures requires consideration of neutron and photon radiation levels in various regions, as well as trade-offs in weight, volume, and cost, leading to a substantial increase in shielding calculation parameters and optimization objectives. This study introduces a high-dimensional multi-objective shielding optimization method based on a multi-parameter shielding calculation surrogate model, with significant improvements to the FCNN-NSGAIII shielding optimization method which integrates a neural network with a genetic algorithm. For the optimization of complex reactor shielding structures under diverse source item energy spectra, the multi-parameter surrogate model achieves a prediction error reduction of an order of magnitude to 3.65% compared to traditional neural networks. Furthermore, the k_NSGAIII optimization algorithm, enhanced with a knee-point strategy, demonstrates a greater relative set coverage indicator than the NSGAIII algorithm, indicating its ability to identify superior shielding design schemes.
