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Three-dimensional fracture of UO_(2)ceramic pellets by phase field modeling

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Science China(Physics,Mechanics & Astronomy) 2025年第1期68卷 165-176页

作者： Wei Xiong xuan Ye Hongzhang Cheng Xiaoming liu Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy TechnologyKey Laboratory of Advanced Reactor Engineering and Safety of Ministry of EducationTsinghua UniversityBeijing 100084China State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

Fracture is the primary failure type for the UO_(2)ceramic pellets,which are operated under irradiation and thermal processes,and physically confined by the *** this work,by combining closely coupled physical processes of heat conduction,heat transfer,and mechanical deformation with the cohesive phase field framework,we proposed a high-precision modeling of quasistatic cracking of three-dimensional(3D)UO_(2)ceramic fuel pellets under high temperature and *** simulation results agree well with the experimental results,indicating that the proposed method has the potential to capture 3D crack modes in the interested time ***,we studied the relation of the 3D fracture patterns of fuel pellets with the peak power *** was found that the power level plays a critical role in determining the competition between radial and circumferential cracks,as well as transverse penetrating cracks.

关键词： phase field method nuclear fuel pellet coupled thermo-mechanical model thermal fracture

Performance and electromagnetic mechanism of radar-and infraredcompatible stealth materials based on photonic crystals

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International Journal of Minerals,Metallurgy and Materials 2025年第3期32卷 710-717页

作者： Yanming liu xuan Yang Lixin xuan Weiwei Men Xiao Wu Yuping Duan AVIC Research Institute for Special Structures of Aeronautical Composite Ji’nan 250023China Aviation Key Lab of Science and Technology on High Performance Electromagnetic Windows Ji’nan 250023China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116085China

Traditional stealth materials do not fulfill the requirements of high absorption for radar waves and low emissivity for infrared ***,they can be detected by various technologies,considerably threatening weapon ***,a stealth material compatible with radar and infrared was designed based on the photonic bandgap characteristics of photonic *** radar stealth lay-er(bottom layer)is a composite of carbonyl iron/silicon dioxide/epoxy resin,and the infrared stealth layer(top layer)is a 1D photonic crystal with alternately and periodically stacked germanium and silicon *** composition optimization and structural adjust-ment,the effective absorption bandwidth of the compatible stealth material with a reflection loss of less than-10 dB has reached 4.95 *** average infrared emissivity of the proposed design is 0.1063,indicating good stealth *** theoretical analysis proves that photonic crystals with this structural design can produce infrared waves within the photonic bandgap,achieving high radar wave transmittance and low infrared *** stealth is achieved without affecting the absorption performance of the radar stealth layer,and the conflict between radar and infrared stealth performance is *** work aims to promote the application of photonic crystals in compatible stealth materials and the development of stealth technology and to provide a design and theoretical found-ation for related experiments and research.

关键词： microwave absorption infrared stealth photonic crystal compatible stealth

Efficacy and Safety of Aspirin for Prevention of Hepatocellular Carcinoma:An Updated Meta-analysis

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Journal of Clinical and Translational Hepatology 2022年第5期10卷 835-846页

作者： Lun-Jie Yan Sheng-Yu Yao Hai-Chao Li Guang-Xiao Meng kai-xuan liu Zi-Niu Ding Jian-Guo Hong Zhi-Qiang Chen Zhao-Ru Dong Tao Li Department of General Surgery Qilu HospitalShandong UniversityJinanShandongChina Department of Hepatobiliary Surgery The second Hospital of Shandong UniversityJinanShandongChina

Background and Aims:Previous meta-analyses have shown that aspirin use may reduce the risk of hepatocellular carcinoma(HCC).However,the optimal dose,frequency,and duration of aspirin use or the safety and efficacy of aspirin in target populations for HCC prevention remain *** study aim was to investigate the efficacy and safety of aspirin for prevention of ***:Publications were retrieved by a comprehensive literature research of several *** on a random-effects model,hazard ratios(HRs)and the corresponding 95%confidence intervals(CIs)were used to assess the pooled *** dose-response relationship between aspirin use and HCC risk was assessed with a restricted cubic spline ***:Twenty-two studies were included in the *** use was associated with a reduced risk of HCC(HR=0.64,95%CI:0.56–0.75).The effect was robust across sex and age;however,women and the non-elderly had the greatest benefit from aspirin *** preventive effect was well reproduced in those with *** use and long-term use of aspirin appeared to offer greater *** 100 mg/d was associated with maximum reduction of HCC *** use did slightly increase the risk of bleeding(HR=1.14,95%CI:1.02–1.27).Conclusions:Our meta-analysis confirmed that use of aspirin significantly reduced the incident risk of *** and long-term aspirin use offers a greater *** use was associated with an increased risk of *** recommend 100 mg/d aspirin as a feasible dose for further research on primary prevention of HCC in a broad at-risk population.

关键词： Aspirin Hepatocellular carcinoma Prevention Meta-analysis Doseresponse analysis

Insight into catalytic performance and reaction mechanism for toluene total oxidation over Cu-Ce supported catalyst

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Journal of Environmental Sciences 2025年第3期149卷 476-487页

作者： xuan Liang Jin Zhang Juntai Tian Zenghua Xie Yue liu Peng liu Daiqi Ye School of Environment and Energy South China University of TechnologyGuangzhou 510006China National Engineering Laboratory for VOCs Pollution Control Technology and Equipment Guangzhou 510006China Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control South China University of TechnologyGuangzhou 510006China Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal South China University of TechnologyGuangzhou 510006China

Herein,three supported catalysts,CuO/Al_(2)O_(3),CeO_(2)/Al_(2)O_(3),and CuO-CeO_(2)/Al_(2)O_(3),were synthesized by the convenient impregnation method to reveal the effect of CeO_(2)addition on catalytic performance and reaction mechanism for toluene *** with CuO/Al_(2)O_(3),the T_(50)and T_(90)(the temperatures at 50%and 90%toluene conversion,respectively)of CuO-CeO_(2)/Al_(2)O_(3)were reduced by 33 and 39°C,respectively.N_(2)adsorptiondesorption experiment,XRD,SEM,EDS mapping,Raman,EPR,H_(2)-TPR,O_(2)-TPD,XPS,NH_(3)-TPD,Toluene-TPD,and in-situ DRIFTS were conducted to characterize these *** excellent catalytic performance of CuO-CeO_(2)/Al_(2)O_(3)could be attributed to its strong coppercerium interaction and high oxygen vacancies ***,in-situ DRIFTS proved that CuO-CeO_(2)/Al_(2)O_(3)promoted the conversion of toluene to benzoate and accelerated the deep degradation path of *** work provided valuable insights into the development of efficient and economical catalysts for volatile organic compounds.

关键词： Cu-Ce supported catalyst Copper-cerium interaction Oxygen vacancies Toluene oxidation Reaction mechanism

前路经椎体内入路全内镜下减压治疗单节段颈椎间盘突出症临床研究

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中国修复重建外科杂志 2020年第5期34卷 543-549页

作者：杨俊松楚磊邓忠良 kai-xuan liu 邓锐陈浩刘鹏刘团江荣雪芹郝定均西安交通大学附属红会医院脊柱外科西安710054 重庆医科大学附属第二医院骨科重庆400010 美国新泽西州大西洋脊柱中心美国新泽西州07052 海南省第三人民医院疼痛脊柱微创中心海南三亚572000

目的探讨前路经椎体内入路全内镜下减压治疗单节段颈椎间盘突出症的临床可行性。方法回顾分析2014年9月—2016年3月收治的符合选择标准的21例接受前路经椎体内入路全内镜下减压治疗的颈椎间盘突出症患者。男12例,女9例;年龄32~65岁,平均... 详细信息

目的探讨前路经椎体内入路全内镜下减压治疗单节段颈椎间盘突出症的临床可行性。方法回顾分析2014年9月—2016年3月收治的符合选择标准的21例接受前路经椎体内入路全内镜下减压治疗的颈椎间盘突出症患者。男12例,女9例;年龄32~65岁,平均48.5岁。症状持续时间6~18周,平均10.5周。脊髓症状Nurick分级1级2例,2级7例,3级12例。手术节段:C3、42例,C4、58例,C5、69例,C6、72例。记录手术时间以及相关并发症。手术前后于颈椎X线片上测量颈椎手术椎体及病变节段椎间隙中心垂直高度,采用疼痛视觉模拟评分(VAS)及日本骨科协会(JOA)评分评价疼痛及功能改善情况。术后3个月复查颈椎MRI,术后12个月复查颈椎CT,进一步评估患者脊髓减压情况及椎体内骨道愈合情况。结果21例患者均顺利完成手术,手术时间85~135 min,平均96.5 min。患者均获随访,随访时间24~27个月,平均24.5个月。未发生髓核残留、脊髓神经损伤、食道大血管损伤、胸腔积液、终板塌陷、椎管内血肿等并发症;随访期间未见同节段椎间盘再突出以及颈椎失稳、后凸畸形等。术后12个月颈肩痛VAS评分及JOA评分均较术前显著改善(P<0.05)。术后3个月颈椎MRI示脊髓神经减压充分,硬膜囊无明显受压,T2像上髓内高信号均较术前有不同程度减退;术后12个月CT示患者椎体内骨道均实现骨性愈合。术后24个月,病变节段椎间隙中心垂直高度较术前下降(t=2.043,P=0.035),但手术椎体中心垂直高度与术前比较差异无统计学意义(t=0.881,P=0.421)。结论前路经椎体内入路全内镜下减压将脊柱内镜与椎体内入路的优势相结合,可对脊髓腹侧提供理想、彻底的减压,并获得满意的临床及影像学结果。

关键词：颈椎间盘突出症脊柱内镜经椎体内入路髓核摘除

Electrospraying Si/SiO_(x)/C and Sn/C nanosphere arrays on carbon cloth for high-performance flexible lithium-ion batteries

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Journal of Semiconductors 2025年第1期46卷 234-243页

作者： Di Chen Rui Li Chunxue liu kai Jiang School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081China College of Physics and Mathematics University of Science and TechnologyBeijing 100083China Falculty of Hepato-Pancreato-Biliary Surgery Chinese PLA General HospitalInstitute of Hepatobiliary Surgery of Chinese PLA& Key Laboratory of Digital Hepetobiliary SurgeryChinese PLABeijing 100853China

Exploring electrode materials with larger capacity,higher power density and longer cycle life was critical for developing advanced flexible lithium-ion batteries(LIBs).Herein,we used a controlled two-step method including electrospraying followed with calcination treatment by CVD furnace to design novel electrodes of Si/Si_(x)/C and Sn/C microrods array consisting of nanospheres on flexible carbon cloth substrate(denoted as Si/Si_(x)/C@CC,Sn/C@CC).Microrods composed of cumulated nanospheres(the diameter was approximately 120 nm)had a mean diameter of approximately 1.5μm and a length of around 4.0μm,distributing uniformly along the entire woven carbon *** of Si/Si/Si_(x)/C@CC and Sn/C@CC products were synthesized as binder-free anodes for Li-ion battery with the features of high reversible capacity and excellent *** Si/Six/C electrode exhibited high specific capacity of about 1750 mA∙h∙g^(−1)at 0.5 A∙g^(−1)and excellent cycling ability even after 1050 cycles with a capacity of 1388 mA∙h∙g^(−1).Highly flexible Si/Si_(x)/C@CC//LiCoO_(2)batteries based on liquid and solid electrolytes were also fabricated,exhibiting high flexibility,excellent electrical stability and potential applications in flexible wearable electronics.

关键词： electrospraying Si/SiO_(x)/C Sn/C lithium-ion batteries

On load dependence of detachment rate of kinesin motor

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Chinese Physics B 2025年第1期34卷 498-505页

作者： Xiao-xuan Shi Yao Wang Yu-Ru liu Ping Xie School of Pharmaceutical Engineering Chongqing Chemical Industry Vocational CollegeChongqing 401220China Laboratory of Soft Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Kinesin is an archetypal microtubule-based molecular motor that can generate force to transport cargo in cells. The load dependence of the detachment rate is an important factor of the kinesin motor, the determination of which is critically related to the chemomechanical coupling mechanism of the motor. Here, we use three models for the load dependence of the detachment rate of the kinesin motor to study theoretically and numerically the maximal force generated and microtubuleattachment duration of the motor. By comparing the theoretical and numerical results with the available experimental data,we show that only one model can explain well the available experimental data, indicating that only this model can be applicable to the kinesin motor.

关键词： kinesin detachment rate generated force chemomechanical coupling mechanism optical trapping

A novel method for simultaneous measurement of^(222)Rn and^(220)Rn progeny concentrations measured by an alpha spectrometer

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Nuclear Science and Techniques 2025年第1期36卷 127-139页

作者： Zhong-kai Fan Jia-Le Sun Hao-xuan Li Xiang-Ming Cai Hui Yang Shou-Kang Qiu Yan-Liang Tan Jian Shan School of Nuclear Science and Technology University of South ChinaHengyang 421001China College of Physics and Electronic Engineering Hengyang Normal UniversityHengyang 421008China

The accumulation of^(222)Rn and^(220)Rn progeny in poorly ventilated environments poses the risk of natural radiation exposure to the public.A previous study indicated that satisfactory results in determining the^(222)Rn and^(220)Rn progeny concentrations by measuring the total alpha counts at five time intervals within 560 min should be expected only in the case of high progeny concentrations in *** complete the measurement within a relatively short period and adapt it for simultaneous measurements at comparatively lower^(222)Rn and^(220)Rn progeny concentrations,a novel mathematical model was proposed based on the radioactive decay *** model employs a nonlinear fitting method to distinguish nuclides with overlapping spectra by utilizing the alpha particle counts of non-overlapping spectra within consecutive measurement cycles to obtain the concentrations of^(222)Rn and^(220)Rn progeny in *** verification experiments were conducted using an alpha *** experimental results demonstrate that the concentrations of^(222)Rn and^(220)Rn progeny calculated by the new method align more closely with the actual circumstances than those calculated by the total count method,and their relative uncertainties are all within±16%.Furthermore,the measurement time was reduced to 90 min,representing an acceleration of 84%.The improved capability of the new method in distinguishing alpha particles with similar energies emitted from ^(218)Po and^(212)Bi,both approximately 6 MeV,contributed to realizing more accurate *** proposed method has the potential advantage of measuring relatively low concentrations of^(222)Rn and^(220)Rn progeny in air more quickly via air filtration.

关键词： ^(222)Rn ^(220)Rn Progeny concentration Nonlinear fitting method Alpha spectrometer

Construction of attapulgite-based one-dimensional nanonetwork composites with corrosion resistance for high-efficiency microwave absorption

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International Journal of Minerals,Metallurgy and Materials 2025年第3期32卷 689-698页

作者： kai Xu Qingqing Gao Shaoqi Shi Pei liu Yinxu Ni Zhilei Hao Gaojie Xu Yan Fu Fenghua liu School of Materials Science and Chemical Engineering Ningbo UniversityNingbo 315211China Zhejiang Key Laboratory of Additive Manufacturing Materials Ningbo Institute of Materials Technology&EngineeringChinese Academy of SciencesNingbo 315201China Northwest Yongxin Coatings Limited Company Lanzhou 730046China

Exploring high-efficiency and broadband microwave absorption(MA)materials with corrosion resistance and low cost is ur-gently needed for wide practical ***,the natural porous attapulgite(ATP)nanorods embedded with TiO_(2)and polyaniline(PANI)nanoparticles are synthesized via heterogeneous precipitation and in-situ *** obtained PANI-TiO_(2)-ATP one-di-mensional(1D)nanostructures can intertwine into three-dimensional(3D)conductive network,which favors energy *** min-imum reflection loss(RL_(min))of the PANI-TiO_(2)-ATP coating(20wt%)reaches-49.36 dB at 9.53 GHz,and the effective absorption band-width(EAB)can reach 6.53 GHz with a thickness of 2.1 *** excellent MA properties are attributed to interfacial polarization,mul-tiple loss mechanisms,and good impedance matching induced by the synergistic effect of PANI-TiO_(2)nanoparticle shells and ATP *** addition,salt spray and Tafel polarization curve tests reveal that the PANI-TiO_(2)-ATP coating shows outstanding corrosion resist-ance *** study provides a low-cost and high-efficiency strategy for constructing 1D nanonetwork composites for MA and corrosion resistance applications using natural porous ATP nanorods as carriers.

关键词： microwave absorption corrosion resistance attapulgite TiO_(2) polyaniline