检索结果-内蒙古大学图书馆

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

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

来源：评论

学校读者我要写书评

暂无评论

Improved surface hydrophobicity of self-assembled transport layers enables perovskite/silicon tandem solar cells with efficiency approaching 31%

引用

Journal of Energy Chemistry 2025年第5期104卷 749-755页

作者： Jing Yang Jin Wang Biao Shi Yixin Dong Dongxue Liu Shenhzhi Xu Qian Huang Xiaona Du Fu Zhang Miao Yang Yongcai He Bo He Xiaoning Ru Shengzhong Liu Xixiang Xu Pengyang Wang Ying Zhao Xiaodan Zhang Three Gorges Corporation Science and Technology Research Institute Institute of Photoelectronic Thin Film Devices and Technology Renewable Energy Conversion and Storage Center State Key Laboratory of Photovoltaic Materials and CellsNankai University Tianjin Key Laboratory of Efficient Utilization of Solar Energy Haihe Laboratory of Sustainable Chemical Transformations Engineering Research Center of Thin Film Photoelectronic Technology of Ministry of Education Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University LONGi Central R&D Institute LONGi Green Energy Technology Co. Ltd.

[4-（3,6-dimethyl-9H-carbazol-9-yl）butyl]phosphonic acid （Me-4PACz） self-assembled monolayer （SAM）as the hole transport materials have been demonstrated remarkable potential in perovskite solar cells（PSCs）.However,the hydrophobicity of Me-4PACz presents a critical challenge for the fabrication of high-quality perovskite films due to its poor ***,a doped Al2O3with Me-4PACz to modify the Me-4PACz surface was *** one hand,this approach improved the wettability of the Me-4PACz film,enhancing the coverage,uniformity,and buried interface properties of the perovskite *** the other hand,compared to Al2O3modification alone,doping Al2O3with Me-4PACz allowed direct contact between the perovskite and Me-4PACz,resulting in better buried interface *** a result,we achieved an efficiency of 22.71% for single-junction wide-bandgap perovskite solar cells（1.68 eV）.Additionally,the efficiency of perovskite/silicon tandem solar cells was improved from 28.68%to 30.92%,with a significant reduction in ***,the tandem cells demonstrated no degradation after 4200 s of operation at the maximum power point.

关键词： Hydrophic Me-4PACz Perovskite/silicon Tandem solar cell

来源：评论

学校读者我要写书评

暂无评论

Iron recovery and dephosphorization behaviors from high-phosphorus oolitic hematite by gas-based direct reduction and magnetic separation

引用

Journal of Iron and Steel Research International 2025年第3期32卷 550-563页

作者： Fang Liu Yi-chi Zhang Wang Zeng Jun Ni Yun-peng Si Heng Zhou Tian-xiang Zhang Sheng-li Wu Ming-yin Kou State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China School of Automation and Electrical Engineering University of Science and Technology BeijingBeijing100083China

With the depletion of high-quality iron ore resources,high-phosphorus oolitic hematite(HPOH)has attracted great attention due to its large reserve and relatively high iron ***,HPOH is very difficult to be used in ironmaking process due to its special structure.A two-step method of gas-based direct reduction and magnetic separation was thus proposed to recover iron and reduce *** results showed that the powdery reduced iron produced contained 92.31%iron and 0.1%phosphorus,and the iron recovery was 92.65%under optimum reduction condition,which is suitable for following *** apatite will be reduced under long reduction time and a large reducing gas flow rate,resulting in more phosphorus found in the metallic *** the hydrogen–carbon ratio will inhibit the formation and growth of iron particles and prevent the breakage of oolitic *** adjustment of reduction temperature is recommended as it affects the oolitic structure and reduction.

关键词： High-phosphorus oolitic hematite Iron recovery Dephosphorization Gas-based direct reduction Magnetic separation

来源：评论

学校读者我要写书评

暂无评论

High-efficiency analysis of electromagnetic-thermal effects for absorbing honeycomb based on transformation optics

引用

Optics Express 2025年第1期33卷 944-953页

作者： Wang, Yun Wen, Kaihuai Yue, Xiuli Chen, Peiyan Han, Tiancheng Zhou, Peiheng Liang, Difei Deng, Longjiang National Engineering Research Center of Electromagnetic Radiation Control Materials State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of China Chengdu610054 China

Wave-absorbing honeycombs have garnered widespread attention due to their high-efficiency absorption, ultra-wideband absorption, lightweight nature, and high load-carrying capacity. However, as electromagnetic radiation power increases, the temperature of the absorbing honeycomb increases rapidly, even leading to burning. Therefore, it is significant to possess an efficient and accurate assessment of the thermal effects of absorbing honeycombs under electromagnetic radiation. However, the complex thin-walled structure of the honeycomb increases computational complexity, resulting in time-consuming, resource-intensive, and occasionally unsolvable actions. To address this issue, we implement transformation optics to expand the thin-walled structure and reconstruct the transformed electromagnetic and thermal property parameters. The transformed electromagnetic-thermal coupling simulation results were highly consistent with the actual model. Specially, the mesh count dropped from 272,717 to 17,621, the simulation time decreased from 15,792s to 242s, and the efficiency was improved by 65 times. The proposed methodology overcomes analysis difficulties on multi-scale complex structures, making it possible to analyze the honeycomb structures that traditional methods cannot handle. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Honeycomb structures

来源：评论

学校读者我要写书评

暂无评论

Improving aircraft nose wheel steering stability based on control continuation method

引用

Science China(Technological Sciences) 2025年第3期68卷 258-277页

作者： Qiaozhi YIN Dexu KONG Jiawei WANG Hong NIE Xiaohui WEI National Key Laboratory of Helicopter Aeromechanics Nanjing210016China State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing210016China Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle Nanjing210016China AVIC Nanjing Engineering Institute of Aircraft Systems Nanjing211106China

Aircraft steering instability during the taxiing process sometimes occurs resulting from the unstable bifurcation phenomena of the nonlinear steering dynamic system,which may lead to severe *** this study,the control parameter design of an aircraft nose wheel steering control system based on the control continuation method is proposed to reduce the number of unstable bifurcation points and enlarge the system stable region area in a certain parameter ***,the aircraft turning performance can be improved ***,a nonlinear aircraft rollout dynamic model is constructed,and the aircraft ground steering bifurcation characteristics are obtained under the open-loop steering control ***,the bifurcation performances under three closed-loop nose wheel steering controllers based on the feedback control method are compared,and the control parameter of the quadratic nonlinear controller with a better bifurcation control effect is selected as a second bifurcation parameter to analyze the directional system stability via two-parameter bifurcation ***,the influence of a crosswind on the aircraft ground steering bifurcation performance is studied for various control parameter ***,the control effects of a traditional proportional-integral-derivative(PID)nose wheel steering control law and the designed feedback controller are compared and ***,a semi-physical experiment of the aircraft nose wheel steering system is carried out,and different control parameter values are selected for test verification,which can further verify the control effect of the designed nonlinear feedback *** results indicate that the feedback control method is unable to vary the system bifurcation types,but appropriate control parameter design can effectively shrink the system instability region and even eliminate the unstable Hopf bifurcation points under some specific working conditions,improving the aircraft ground turning stability re

关键词： aircraft taxiing dynamics and stability nose wheel steering control system control continuation steering bifurcation characteristics quadratic feedback control

来源：评论

学校读者我要写书评

暂无评论

The superior ballistic performance of highly stretchable and flexible double-face knitted fabrics(DFKF):An experimental investigation

引用

Defence technology(防务技术) 2025年第3期45卷 119-136页

作者： Yi Zhou Xiangpeng Xin Yang Li Yang Zhou Rui Zhang Lizhi Xu State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China

When the protective and protected systems are detached,the former can be allowed to absorb the kinetic energy of the impacting projectile through large deformation without considering the back face signature of the *** paper presents a novel double-face knitted fabric(DFKF)designed for this very impacting *** tests equipped with high-speed camera were used to characterize the ballistic performance with the impact velocities ranging from 100 m/s to 450 m/*** results showed that the ballistic limits(V_(bl))of DFKF are approximately triple and double that of its counterpart UD and plain fabrics,*** mass-normalized metrics,the specific energy absorption(SEA)is 250%and 350%greater than the UD and plain fabrics at their corresponding V_(bl)*** quasi-static tests showed that the DFKF displayed greater resilience,crease recovery properties,and flexibility,which also made it an especially better candidate than UD and plain weaves for the design of umbrella surface *** was also found that DFKF is dependent on yarn count and the incorporation of spandex.A prototype anti-ballistic umbrella is manufactured using DFKF made of 200D multi-filament *** ballistic performance is also sensitive to the impact site when the umbrella is subjected to impact.

关键词： DFKF Ballistic performance SEA Resilience Energy absorption Anti-ballistic umbrella

来源：评论

学校读者我要写书评

暂无评论

The impact of the coupling relationship between projectile size and yarn dimension on the ballistic performance of plain weave fabric

引用

Defence technology(防务技术) 2025年第1期43卷 288-303页

作者： Kaiying Wang Xuan Zhou Wenke Ren Yiding Wu Yilei Yu Yi Zhou Lizhi Xu Guangfa Gao School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan430079China

Aramid fibers,due to their relatively high inter-yarn friction,high strength,high modulus,and other characteristics,have become a typical representative of flexible anti-ballistic materials in modern *** research on the anti-penetration of aramid fabrics mostly focuses unilaterally on the structure and performance of aramid fabrics or the shape and size of projectiles,with fewer studies on the coupled effect of both on ballistic *** study analyzes how the coupling relationship(or size effect)between the projectile and fiber bundle dimensions affects the fabric ballistic performance from a mesoscopic scale *** plain weave aramid fabric as the research object,considering different diameter projectiles,through a large number of ballistic impact tests and numerical simulations,parameters such as ballistic limit velocity,average energy absorption of fabric,and specific energy absorption ratio(average energy absorption of fabric divided by projectile cross-sectional area)are obtained for ballistic performance *** influence law of projectile size on the ballistic performance of high-performance fabrics is as follows:The relative range of fitted ballistic limit velocity at different target positions gradually decreases and then stabilizes as the projectile diameter increases,indicating that the fabric structure effect gradually disappears at a projectile diameter of 12 mm;The average ballistic limit velocity at three impact positions,P1,P2,and P3,provides the corresponding ballistic limit velocity for 1000D aramid fabric,which increases with projectile diameter but the rate of increase slows down at an inflection point,which in this study occurs where the fabric structure effect nearly disappears at a projectile diameter of 12 mm;The energy absorption ratio increases and then decreases as the projectile diameter increases from 4 mm to 20 mm,reaching a peak at the diameter of 12 mm due to the gradual disappearance of the fabri

关键词： Plain weave fabric Ballistic performance Aramid fiber Projectile size Ballistic experiment

来源：评论

学校读者我要写书评

暂无评论

Thermal strain engineering in cobalt-coordinated Mo2N for efficient ampere-level current density alkaline fresh/seawater hydrogen evolution electrocatalysis

引用

Journal of Energy Chemistry 2025年第4期103卷 282-293页

作者： Yuwen Hu Meilian Tu Tuzhi Xiong Yanxiang He Muhammad Mushtaq Hao Yang Zeba Khanam Yongchao Huang Jianqiu Deng M.-Sadeeq Balogun College of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy Hunan University School of Chemistry and Chemical Engineering University of South China School of Chemistry & Chemical Engineering Guangxi Key Laboratory of Electrochemical Energy Materials Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development Guangxi University Institute of Environmental Research at Greater Bay Key Laboratory for Water Quality and Conservation of the Pearl River Delta Ministry of Education Guangzhou University Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology State Key Laboratory of Non-Food Biomass and Enzyme Technology Guangxi Academy of Sciences

Lattice-strain engineering has demonstrated its capability to influence the electronic structure and catalytic performance of ***,we present a facile method for inducing thermal strain in cobalt/molybdenum nitride rod-shaped structures（denoted Co/Mo2N） via ammonia-assisted reduction,which effectively modulating the HER *** optimized Co/Mo2N-500,characterized by 3% tensile lattice strain,demonstrates exceptional HER activity with lower overpotentials of140 mV and 184 mV at high current density of 1000 mA cm-2in alkaline freshwater and seawater electrolytes,***/Mo2N also exhibits excellent long-term durability even at a high current density of 300 mA cm-2,surpassing its counterparts and benchmark Pt/C *** functional theory calculations validate that the tensile strain optimizes the d-band states,water dissociation,and hydrogen adsorption kinetics of the strained Mo2N in Co/Mo2N,thereby improving its catalytic *** work provides valuable insights into controlling lattice strain to develop highly efficient electrocatalysts towards advanced electrocatalytic applications.

关键词： Ampere-level current density Co/Mo2N Hydrogen evolution reaction Seawater splitting Thermal strain engineering

来源：评论

学校读者我要写书评

暂无评论

Fabrication of Porous SiC Coatings on Quartz Substrates by Laser Chemical Vapor Deposition

引用

Journal of Wuhan University of technology(Materials Science) 2025年第2期40卷 330-337页

作者： YANG Meijun CHEN Rui XU Qingfang GUO Bingjian LIU Kai TU Rong ZHANG Song State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

Laser etching and laser chemical vapor deposition(LCVD)techniques were proposed for the rapid preparation of high-purity,strongly bonded SiC porous micro-nano-coatings on quartz *** laser serves as an external driving force for the vertical growth of SiC whiskers,facilitating the formation of a porous nanostructure that resembles coral models found in the macroscopic biological *** porous nanostructures are beneficial for reducing thermal expansion mismatch and relieving residual *** is capable of eliminating the cracks on the surface of SiC coatings as well as enhancing the bonding of SiC coatings with quartz substrates to avoid coating detachment.

关键词： laser etching laser CVD quartz substrate SiC coating

来源：评论

学校读者我要写书评

暂无评论

Fast deposition of Ni doped YSZ coatings by cathode plasma electrolysis for solid oxide fuel cell applications

引用

Ceramics International 2025年第13期51卷 17268-17277页

作者： Liu, Chenxu Du, Ke Song, Chen Song, Yang Zhou, Chenchen Zhang, Jin Liu, Min Tian, Yu Meng, Yonggang State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China Institute of New Materials Guangdong Academy of Sciences National Engineering Laboratory of Modern Materials Surface Engineering Technology Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology Guangdong-Hong Kong Joint Laboratory of Modern Surface Engineering Technology Guangzhou510650 China School of Materials Science and Engineering Nanyang Technological University 639798 Singapore Beijing Key Laboratory for Corrosion Erosion and Surface Technology Institute of Advanced Materials and Technology University of Science and Technology Beijing Beijing100083 China

The fast fabrication of high-quality anode layers of solid oxide fuel cells (SOFCs) is a key factor for their efficient applications. In this work, a one-step method of cathode plasma electrolytic deposition (CPED) is developed to prepare Ni doped YSZ coatings with a thickness of 35–55 μm on porous stainless steel. Compared to the several hours required by traditional methods, a faster coating deposition that only takes 60 s is achieved owing to the effect of enormous energy of plasma arc at the solid-liquid interface in the CPED method. The preparation process is analyzed by recording the variation of current with voltage. The unique micro-structure of the coatings is observed, and the formation mechanism of the Ni doped YSZ coating during the CPED process is proposed. The deposited coatings show an excellent performance as the anode layers for SOFCs, with Sc2O3 stabilized ZrO2 coating prepared by atmospheric plasma spraying as electrolyte and La0.6Sr0.4Co0.2Fe0.8O3-δ as the cathode. The open circuit voltage of the cells reaches 1.000 V and the maximum power density reaches 817.4 mW cm−2 at 800 °C. The finding opens a novel pathway for the efficient preparation of anode materials for SOFCs. © 2025

关键词： Plasma spraying

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：