检索结果-内蒙古大学图书馆

Indirect neutron radiography experiment on dummy nuclear fuel rods for pressurized water reactors at CMRR

nuclear Science and Techniques 2024年第11期35卷 13-27页

作者： Yong Sun Qi-Biao Wang Peng-Cheng Li Ming Xia Bin Liu He-Yong Huo Wei Yin Yang Wu Sheng Wang Chao Cao Xin Yang Run-Dong Li Hang Li Bin Tang Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621000China School of Physics and Electronic Engineering Sichan University of Science and EngineeringZigong 643000China

nuclear energy is a vital source of clean energy that will continue to play an essential role in global energy production for future *** fuel rods are core components of nuclear power plants,and their safe utilization is *** to its inherent high radioactivity,indirect neutron radiography(INR)is currently the only viable technology for irradiated nuclear fuel rods in the field of energy *** study explores the experimental technique of indirect neutron computed tomography(INCT)for radioactive *** project includes the development of indium and dysprosium conversion screens of different thicknesses and conducts resolution tests to assess their ***,pressurized water reactor(PWR)dummy nuclear fuel rods have been fabricated by self-developing substitute materials for cores and outsourcing of mechanical *** research on the INR is performed using the developed dummy nuclear fuel *** sparse reconstruction technique is used to reconstruct the INR results of 120 pairs of dummy nuclear fuel rods at different angles,achieving a resolution of 0.8 mm for defect detection using INCT.

关键词： Conversion screen Dysprosium Indirect neutron computed tomography Dummy nuclear fuel rods

来源：评论

学校读者我要写书评

暂无评论

Control system design for a pressure-tube-type supercritical water-cooled nuclear reactor via a higher order sliding mode method

引用

nuclear Science and Techniques 2024年第1期35卷 145-154页

作者： M.Hajipour G.R.Ansarifar Department of Nuclear Engineering Faculty of PhysicsUniversity of IsfahanIsfahan 81746-73441Iran

nuclear power plants exhibit non-linear and time-variable ***,designing a control system that sets the reactor power and forces it to follow the desired load is complicated.A supercritical water reactor(SCWR)is a fourth-generation conceptual *** an SCWR,the non-linear dynamics of the reactor require a controller capable of control-ling the *** this study,a pressure-tube-type SCWR was controlled during reactor power maneuvering with a higher order sliding mode,and the reactor outgoing steam temperature and pressure were controlled *** an SCWR,the temperature,pressure,and power must be maintained at a setpoint(desired value)during power *** point kinetics equations with three groups of delayed neutrons were used in the ***-order and classic sliding mode controllers were separately manufactured to control the plant and were compared with the PI controllers speci-fied in previous *** controlled parameters were reactor power,steam temperature,and ***,for these parameters,the PI controller had certain instabilities in the presence of *** classic sliding mode controller had a higher accuracy and stability;however its main drawback was the chattering *** was highly accurate and stable and had a small computational *** reality,it followed the desired values without oscillations and chattering.

关键词： Supercritical water nuclear reactor Higher order sliding mode controller Steam temperature Steam pressure Point kinetics model

来源：评论

学校读者我要写书评

暂无评论

A polarized^(3)He system based on metastability-exchange optical pumping

引用

Science China(physics,Mechanics & Astronomy) 2024年第7期67卷 72-81页

作者： Yuting Wang Liangyong Wu Kaiyuan Zhang Mei Peng Siyu Chen Haiyang Yan State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Fudan UniversityShanghai 200433China Key Laboratory of Neutron Physics Institute of Nuclear Physics and ChemistryChina Academy of Engineering PhysicsMianyang 621900China

Hyperpolarized^(3)He nuclei have emerged as a significantly important approach in quantum precision measurement techniques,with extensive applications in fundamental physics,magnetometry,metrology,and *** this study,we report on the design and implementation of a^(3)He polarization system at the China Mianyang Research Reactor(CMRR),utilizing the metastabilityexchange optical pumping(MEOP)*** employed a Merritt coil system consisting of four square coils to furnish a uniform holding *** deployed a 2 W fiber laser to pump the metastable^(3)He atoms and conducted free induction decay(FID)detection of the polarized^(3)He nuclei using both pickup coil and optical *** the optical method,we used a50 m W linearly polarized distributed Bragg reflector(DBR)laser as the *** applied transverse light absorption polarimetry to measure the absolute nuclear polarization of the ground-state^(3)*** have developed cell fabrication capabilities at the CMRR,and cells at various pressures ranging from 100 to 1000 Pa have been fabricated and *** a typical borosilicate cell with 100 Pa pressure,the absolute polarization is measured as Pn≈70%,and the transverse relaxation time is estimated as T2≈0.5 ***,we constructed a few aluminosilicate cells,each carefully filled with pure^(3)He at a pressure of 100 ***,we conducted a comprehensive evaluation of their performance in the context of MEOP.

关键词： metastability exchange optical pumping polarized^(3)He magnetic resonance

来源：评论

学校读者我要写书评

暂无评论

Synergistic Effects of Gamma Irradiation,Tensile Stress and Moisture on the Radiolysis of Silicone Foam

引用

Chinese Journal of Polymer Science 2023年第12期41卷 1969-1978,I0011页

作者： Pu-Cheng Wang Qiang Liu Bo Liu Wei Huang You An Jian-Yong Liu Hong-Bing Chen Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621000China

The present work involves the investigation of the synergistic effects of gamma irradiation,tensile stress and absorbed moisture on the radiolysis behaviors of silicone foams by experiments and theoretical *** both the pristine and dehydrated samples,the permanent tensile set increases with the initial tensile *** analysis uncovers that the dehydrated samples exhibit greater permanent tensile sets,lower further elongation and higher Young’s modulus than the counterparts of the pristine samples with the same initial tensile strain and gamma dose,verifying the vital synergistic effects on crosslinking network and aggregation structures caused by moisture and gamma *** synergistic effects unveiled by reactive molecular dynamics at the atomic scale are due to the moisture-induced neutralization and stabilization of the macromolecular *** steric hindrance of moisture located at the interface of silica and polymer chains also conduces to the observed synergistic effects due to the inhibited crosslinking reactions.

关键词： Silicone foam Synergistic effect Gamma irradiation Tensile stress Moisture

来源：评论

学校读者我要写书评

暂无评论

Experimental and numerical study of radial and axial HTS magnetic couplers

引用

Superconductivity 2024年第4期12卷 9-21页

作者： Maxim Osipov Irina Martirosian Aleksandr Starikovskii Dmitrii Aleksandrov National Research Nuclear University MEPhI(Moscow Engineering Physics Institute) MoscowRussia

The paper presents the results of an experimental study and numerical cakulations of torques in magnetic cou-plers of various configurations.A comparison was made for model couplers based on permanent magnets(PMG)and couplers based on high-temperature superconducting(HTS)tapes cooled with liquid *** PMG-couplers,both coupler halves are made of pemmanent magnets,while in HTS-couplers,one coupler half is axial and radial configurations,with different clearances between the coupler *** results of experimental made of HTS-tapes stacks,and the second of permanent *** types of couplers are considered in both studies showed that in the configurations we considered,radial HTS-co uplers are superior to their axialanalogues in termsof the maximum torque between the coupler *** addition,in the considered configurations,PMG couplers excceded their HTS analogues in torque by *** finite element calculations usinga com-bined A-T-H form ulation were used to optimize the design of the *** model was verified using the obtained experimental data for moments in model *** model was used to calculate an optimized cou-pler with added HTS-windings,lowerHTS temperature and strongerpermanent *** calculation results showed that HTS-couplers can be comparable with their PMG analogues,at the same time they are significantly superior to them in damping external *** to the fact that the best characteristics were shown by model radial couplers with m inimal gaps between the coupler halves,radial couplers were manufactured based on windings of 10 and 20 layers of HTS-tapes and the torques in them weremeasured in theFCandZFC *** has been shown that in most operating conditions,10-layer couplers outperform 20-layer couplers.

关键词： High temperature superconductors CC‐tapes Superconducting levitation Magnetic couplers

来源：评论

学校读者我要写书评

暂无评论

Intrinsic lithiophilic carbon host derived from bacterial cellulose nanofiber for dendrite-free and long-life lithium metal anode

引用

Nano Research 2024年第5期17卷 4203-4210页

作者： Gangyi Xiong Jiayu Yu Yalan Xing Puheng Yang Shichao Zhang School of Materials Science and Engineering Beihang UniversityBeijing 100191China School of Physics Science and Nuclear Energy Engineering Beihang UniversityBeijing 100191China

Although lithium metal is considered a promising anode for advanced Li-S and Li-air batteries,the uncontrolled dendrite growth and infinite volume change impede its practical ***,we report an ideal framework composed of carbonized bacterial cellulose(CBC)nanofibers,which shows intrinsic lithiophilicity to molten lithium without any lithiophilic surface *** wetting behavior of molten lithium can be significantly improved because its surface functional groups provide thermodynamical driving force,and the high surface roughness derived from nanocracks leads to rapid infusion in *** hybrid anode exhibits long cycle life up to 2000 h and excellent deep stripping-platting capacity up to 20 mAh·cm^(-2).When the anode is assembled with LiFePO_(4) cathode,the full cell delivers a good cycling stability up to 700 *** is attributed to the intrinsic lithiophilic scaffold,which can not only lower the nucleation barrier of Li and provide uniform nucleation sites for stable Li stripping/plating,but also offer interspace to accommodate volume fluctuation of lithium during long *** work provides a new manner to achieve a series of intrinsic lithiophilic carbon skeletons based on the large family of biomass materials and organic materials.

关键词： intrinsic lithiophilicity lithium metal anode bacterial cellulose lithium dendrite long cycling life

来源：评论

学校读者我要写书评

暂无评论

Mesh‑free semi‑quantitative variance underestimation elimination method in Monte Caro algorithm

引用

nuclear Science and Techniques 2023年第1期34卷 157-171页

作者： Peng‑Fei Shen Xiao‑Dong Huo Ze‑Guang Li Zeng Shao Hai‑Feng Yang Peng Zhang Kan Wang Department of Engineering Physics Tsinghua UniversityBeijing 100084China China Nuclear Power Engineering Corporation Beijing 100840China

The inter-cycle correlation of fission source distributions(FSDs)in the Monte Carlo power iteration process results in variance underestimation of tallied physical quantities,especially in large local *** study provides a mesh-free semiquantitative variance underestimation elimination method to obtain a credible confidence interval for the tallied *** method comprises two procedures:Estimation and *** FSD inter-cycle correlation length is estimated in the Estimation procedure using the Sliced Wasserstein distance *** batch method was then used in the elimination *** FSD inter-cycle correlation length was proved to be the optimum batch length to eliminate the variance underestimation *** exemplified this method using the OECD sphere array model and 3D PWR BEAVRS *** results showed that the average variance underestimation ratios of local tallies declined from 37 to 87%to within±5%in these models.

关键词： Monte Carlo algorithm Power iteration process Inter-cycle correlation Variance underestimation Sliced Wasserstein distance

来源：评论

学校读者我要写书评

暂无评论

Research progress and development tendency on storage mechanism of multi-principal element alloys for hydrogen/tritium storage

引用

Rare Metals 2024年第11期43卷 5549-5572页

作者： Yi-Jie Chen Jian-Wei Zhang Can-Hui Xu Mu-Hong Li Shuang-Lin Hu Yue-Xia Wang Xiao-Tao Zu Hai-Yan Xiao Xiao-Song Zhou Shu-Ming Peng Hua-Hai Shen Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Key Laboratory of Nuclear Physics and Ion-Beam Application(MOE) Institute of Modern PhysicsDepartment of Nuclear Science and TechnologyFudan UniversityShanghai 200433China School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China

Sustainable clean energy is gradually replacing traditional fossil energy sources in important industrial applications and is placing higher demands on the technologies of energy storage and *** development of multi-principal element alloys(MPEAs)offers a new idea for safe solid-state hydrogen storage *** to the unique characteristics of complex components and severe lattice distortion,MPEAs are predicted to have better hydrogen storage performance and more probability for modulation and enhancement,allowing them to meet the requirements of different hydrogen storage *** unique structure characteristic potentially devotes the improvement of thermodynamic and kinetic performance,such as the hydrogen storage capacity and hydrogen adsorption/desorption ***,several important modulation factors originating from components and structures facilitate the understanding of the correlation between hydrogen storage properties and ***,we highlight the correlations of hydrogen storage mechanism,with the degree of lattice distortion,the element variation or segregation and valence electron ***,the development tendency on the hydrogen storage mechanism based on the advanced microscopy and computational approach is ***,the chemically short-range ordered structure in MPEAs is predicted as a potential modification factor of the hydrogen/tritium storage properties.

关键词： Multi-principal element alloys(MPEAs) Hydrogen/Tritium storage Hydrogenation mechanism Development tendency Advanced microscopy

来源：评论

学校读者我要写书评

暂无评论

Unveiling the early universe:Axion-like particles and their role in primordial structure formation

引用

Science China(physics,Mechanics & Astronomy) 2024年第11期67卷 178-179页

作者： Sergey G.Rubin National Research Nuclear University MEPhI(Moscow Engineering Physics Institute) Moscow 115409Russia

The groundbreaking discovery of gravitational waves(GWs)by the LIGO-VIRGO-KAGRO collaboration has revolutionized our understanding of the universe and opened up a new way of observing cosmic events. Unlike light waves... 详细信息

关键词： universe gravitational cosmic

来源：评论

学校读者我要写书评

暂无评论

Conceptual design of a Cs2LiLaBr6 scintillator‑based neutron total cross section spectrometer on the back‑n beam line at CSNS

引用

nuclear Science and Techniques 2023年第1期34卷 23-32页

作者： Da‑Jun Zhao Song Feng Pin‑Jing Cheng Rong Liu Wen Luo Hao‑Qiang Wang Jie‑Ming Xue Kun Zhu Bo Zheng School of Nuclear Science and Technology University of South ChinaHengyang 421001China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China

To reduce the experimental uncertainty in the 235 U resonance energy region and improve the detection efficiency for neutron total cross section measurements compared with those obtained with the neutron total cross section spectrometer(NTOX), a dedicated lithium-containing scintillation detector has been developed on the Back-n beam line at the China Spallation Neutron Source. The Fast Scintillator-based Neutron Total Cross Section(FAST) spectrometer has been designed based on a Cs2Li La Br6(CLLB) scintillator considering the γ-ray flash and neutron environment on the Back-n beam line. The response of the CLLB scintillator to neutrons and γ-rays was evaluated with different 6Li/7 Li abundance ratios using Geant4. The neutron-γdiscrimination performance of the CLLB has been simulated considering different scintillation parameters, physical designs,and light readout modes. A cubic 6Li-enriched( > 90%) CLLB scintillator, which has a thickness of 4-9 mm and side length of no less than 50 mm to cover the Φ 50 mm neutron beam at the spectrometer position, has been proposed coupling to a side readout SiPM array to construct the FAST spectrometer. The developed simulation techniques for neutron-γ discrimination performance could provide technical support for other neutron-induced reaction measurements on the Back-n beam line.

关键词： Neutron total cross section CLLB scintillator Geant4 Pulse shape discrimination(PSD)

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：