检索结果-内蒙古大学图书馆

A Hybrid Level Set Optimization Design Method of Functionally Graded Cellular Structures Considering Connectivity

Computers, Materials & Continua 2024年第4期79卷 1-18页

作者： Yan Dong Kang Zhao Liang Gao Hao Li The State Key Lab of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan430074China Institute of Systems Engineering China Academy of Engineering PhysicsMianyang621900China

With the continuous advancement in topology optimization and additive manufacturing(AM)technology,the capability to fabricate functionally graded materials and intricate cellular structures with spatially varying microstructures has grown ***,a critical challenge is encountered in the design of these structures–the absence of robust interface connections between adjacent microstructures,potentially resulting in diminished efficiency or macroscopic failure.A Hybrid Level Set Method(HLSM)is proposed,specifically designed to enhance connectivity among non-uniform microstructures,contributing to the design of functionally graded cellular *** HLSM introduces a pioneering algorithm for effectively blending heterogeneous microstructure ***,an interpolation algorithm is presented to construct transition microstructures seamlessly connected on both ***,the algorithm enables the morphing of non-uniform unit cells to seamlessly adapt to interconnected adjacent *** method,seamlessly integrated into a multi-scale topology optimization framework using the level set method,exhibits its efficacy through numerical examples,showcasing its prowess in optimizing 2D and 3D functionally graded materials(FGM)and multi-scale topology *** essence,the pressing issue of interface connections in complex structure design is not only addressed but also a robust methodology is introduced,substantiated by numerical evidence,advancing optimization capabilities in the realm of functionally graded materials and cellular structures.

关键词： Hybrid level set method functionally graded cellular structure connectivity interpolated transition optimization design

来源：评论

学校读者我要写书评

暂无评论

Development of titanium diaphragms for space propellant tank

Development of titanium diaphragms for space propellant tank

引用

2022 International Conference on Advanced Control, Automation and Robotics, ICACAR 2022

作者： Zhang, Hai Gu, Sendong Zhang, Jianjun Ouyang, Ruijie Yu, Bin Yang, Wenbo Zhang, Xiao Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Lanzhou China

The fundamental structure of the space propellant tank is introduced. The design flow and the numerical simulation method of a typical metal diaphragm are proposed. Then, a range of 237mm diameter titanium diaphragms with different bottom fillet radiuses are designed. Based on the arc-length method, a series of finite element models of the reversal process of these titanium diaphragms are developed. With the aid of the models, this paper analyzes the effect of bottom fillet radius on pressures differential to roll the titanium diaphragms. The results show that the critical pressure increases with the decrease of the bottom fillet radius. A near linear increase is found, which indicated that the bottom fillet radius has a certain effect on the critical pressure. The maximum equivalent von mises stress increases with the decrease of the bottom fillet radius. The increase leads to the increase of the critical pressure. In addition, the deformation of the diaphragms becomes more and more instable with the decrease the bottom fillet radius. © Published under licence by IOP Publishing Ltd.

关键词： Titanium

来源：评论

学校读者我要写书评

暂无评论

Simultaneous fabrication of porous metals and metallic nanowires via atmospheric pressure plasma-assisted electro-dealloying

引用

science China(Technological sciences) 2023年第1期66卷 165-172页

作者： LU AnKang LI HanYu YU Yao LIU Lin State Key Lab for Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Wuhan National High Magnetic Field Center and Sechool of Physics Huazhong University of Science and TechnologyWuhan 430074China

Porous metals and metallic nanowires have gained significant attention for their potential applications in catalysis, sensing, and energy storage. Developing a versatile and efficient method for fabricating these functional materials is crucial but remains challenging. Herein, we report a novel and facile electro-dealloying strategy to simultaneously fabricate porous metals and metallic nanowires using atmospheric radio-frequency(RF) capacitively coupled plasmas. The synergistic effect of the heating and plasma sheath’s electric field lead to the nonequilibrium melting of the alloy, resulting continuous ejection of the melted segments to form nanowires and let the unmelted residual parts evolve into a porous structure. This method is applicable to alloys with large melting point differences of their constituent elements, and provides a promising approach to fabricate porous metals and metallic nanowires for a wide range of functional applications.

关键词： atmospheric plasma porous metals metallic nanowires electro-dealloying

来源：评论

学校读者我要写书评

暂无评论

Superconducting properties of rare-earth boron hydrides at high pressure studied by first-principles calculations

引用

Physical Review B 2024年第6期110卷 L060514页

作者： Simin Li Weiguo Sun Hanyu Liu Cheng Lu Feng Peng College of Physics and Electronic Information Institute of High Pressure Physics School of Physical Science and Technology International Center for Computational Method and Software and State Key Lab of Superhard Materials College of Physics School of Mathematics and Physics

It is a long-thought proposal that dense light-element molecular hydrides, such as diborane (B2H6) and methane (CH4), offer an ideal platform to search for phonon-mediated superconductors. However, these hydrides are often unstable under sufficiently high pressure, e.g., B2H6 decomposed into BH and H2 at pressures of above 153 GPa, which are unlikely to exhibit high superconductivity. Here, we find a feasible route to stabilize these light-element molecular hydrides with high superconductivity under high pressure by high-throughput structure searches and first-principles calculations. We uncover a series of stable H-rich rare-earth (R) metal based boron hydrides RB2H10 with polydiborane networks. Strikingly, YB2H10 is predicted to be a high-temperature superconductor with unprecedentedly critical temperature ( Tc ) of up to 93 K under 150 GPa. The present findings open a route to stabilize the unstable diborane by bringing the additional R metals into the lattice under high pressure, as well as tuning the superconductivity among diborane-based hydrides and other similar dense light-element molecular hydrides.

关键词： Pressure effects Structural properties Superconducting phase transition High-temperature superconductors Density functional theory First-principles calculations

来源：评论

学校读者我要写书评

暂无评论

Ion thruster accelerator grid erosion mechanism under extreme conditions of cylindrical erosion and chamfer erosion

引用

Chinese Journal of Aeronautics 2023年第6期36卷 128-139页

作者： Guangqing XIA Jiahui LI Chang LU Hai GENG Vladimir A.SAETCHNIKOV Juan LI Yanlong WANG State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentDalian University of TechnologyDalian 116024China Key Laboratory of Advanced Technology for Aerospace Vehicles of Liaoning Province Dalian University of TechnologyDalian 116024China Collaborative Innovation Center of Micro&Nano Satellites of Hebei Province North China Institute of Aerospace EngineeringLangfang 065000China Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of PhysicsLanzhou 73000China Physics and Aerospace Technology Department Belarusian State UniversityMinsk 220030Belarus

In this paper,the abnormal experimental phenomenon on barrel erosion under extreme working conditions in the ultra-long life experiment(>10000 h)of ion thruster ion optics is studied by the Immersed-Finite-Element Particle-In-Cell Monte-Carlo-Collision(IFE-PIC-MCC)method and the grid erosion evaluation *** transport process of beam ions and Charge Exchange(CEX)ions in the grid system,and the characteristics and mechanisms of the aperture barrel erosion under extreme erosion conditions(*** cylindrical erosion and chamfer erosion)were systematically *** to the advantage of the IFE method for dealing with complex boundaries in structured mesh,the aperture barrel erosion morphology of the accelerator grid is reconstructed accurately based on the experimental *** results show that,with the evolution of working conditions,the mechanism of the aperture barrel erosion changes significantly,which relies heavily on the accelerator grid *** change of the accelerator grid aperture barrel morphology has a significant effect on the behavior of CEX ions,and only affects the local electric field distribution,but has no effect on the upstream plasma *** the erosion progresses,the erosion position moves downstream along the grid aperture axis direction,and the erosion range becomes *** of the erosion phase,the erosion rate of the CEX ions located downstream of the decelerator grid is the *** erosion rate is related to the mean incident energy and angle,and their variation is closely related to the position and trajectory of CEXions.

关键词： Accelerator grid Charge Exchange(CEX)ions Erosion IFE-PIC-MCC Ion propulsion

来源：评论

学校读者我要写书评

暂无评论

Durability assessment and experimental validation of the ion optics system for ion thrusters

Durability assessment and experimental validation of the ion...

引用

2024 International Conference on Optoelectronic Materials and Devices, ICOMD 2024

作者： Yang, Wei Zuo, Chunlian Sun, Mingming Yang, Zhifeng Chongqing University of Science and Technology Chongqing404100 China Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou730000 China Angang Group Yongtong Ductile Cast Iron Pipe Co. Ltd. Anyang455000 China

ISBN: (数字)9781510689046

ISBN: (纸本)9781510689039

The finite element method and the PIC-MCC method were employed to simulate and calculate the hot gap and etching rates of different regions within the ion optics system of the 30cm ion thruster, aiming to estimate its in-orbit service life. Upon reaching thermal equilibrium, it was observed that the decelerator grid exhibited a central depression characteristic in its overall deformation, while the accelerator grid displayed a uniform protrusion. Within a central area with a diameter ranging from 0 to 70 mm, there was an average decrease of 0.057 mm in the gap between the two grids. In an annular region with a diameter ranging from 70 to 140 mm, this average gap increased to 0.129 mm. Over a period of 1500 hours, The etching rate of the apertures located at the periphery of the decelerator grid was found to be as high as 6.25×10-14 kg/s;however, by 5700 hours, this rate had decreased by only15.4% compared to that at hour1500. At this time, the etching rates for apertures at both center and edge positions on the accelerator grid, and also for the central area of the decelerator grid, had decreased to 8.0%, 4.1%, and 3.6%. individually, in comparison with their respective rates at 1500 hours. The results obtained froma life time test conducted over 5700-hours indicated that etching of the central hole in the decelerator grid as well as the central and edge holes in the accelerator grid followed a basical linear trend. All simulation results compared to experimental data had an error within 10%. © 2025 SPIE.

关键词： Ion propulsion

来源：评论

学校读者我要写书评

暂无评论

Numerical simulation of the start-up process of a miniature ion thruster

引用

Plasma science and technology 2022年第7期24卷 63-73页

作者： Xinyong YANG Liqiu WEI Wenjia JIANG Tianyuan JI Liwei ZHOU Hong LI Yongjie DING Jingfeng TANG Ning GUO Daren YU School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001People's Republic of China Key Laboratory of Aerospace Plasma Propulsion Ministry of Industry and Information TechnologyHarbin 150001People's Republic of China Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of PhysicsLanzhou 730000People's Republic of China

A particle-in-cell Monte Carlo collision model of a discharge chamber is established to investigate the start-up process of a miniature ion *** present the discharge characteristics at different stages(the initial stage,development stage,and stable stage)according to the trend of the discharge current with *** discharge current is the sum of the sidewall current and the backplate *** the start-up process,the sidewall current lags behind the backplate *** variation and distribution characteristics of the discharge current over time are determined by the electron density distribution and electric potential distribution.

关键词： miniature ion thruster discharge chamber start-up process Monte Carlo collision

来源：评论

学校读者我要写书评

暂无评论

Larger in-plane upper critical field and superconducting diode effect observed in topological superconductor candidate InNbS_(2)nanoribbons

引用

Nano Research 2024年第7期17卷 6686-6694页

作者： Bo Zheng Changlong Wang Xukun Feng Xiaozhen Sun Shasha Wang Dawei Qiu Xiang Ma Ruimin Li Guanglei Cheng Lan Wang Yalin Lu Peng Li Shengyuan A.Yang Bin Xiang Department of Materials Science and Engineering CAS Key Lab of Materials for Energy ConversionAnhui Laboratory of Advanced Photon Science and TechnologyUniversity of Science and Technology of ChinaHefei 230026China Research Laboratory for Quantum Materials Singapore University of Technology and DesignSingapore 487372Singapore School of Microelectronics University of Science and Technology of ChinaHefei 230052China CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences University of Science and Technology of ChinaHefei 230026China Lab of Low Dimensional Magnetism and Spintronic Devices School of PhysicsHefei University of TechnologyHefei 230009China Research Laboratory for Quantum Materials IAPMEUniversity of MacaoMacaoChina

Recently,the coexistence of topology and superconductivity has garnered considerable ***,the dimensionality of these materials is crucial for the realization of topological quantum ***,the naturally grown materials,especially with one-dimensional feature that exhibits the coexistence of topology and superconductivity,still face challenges in terms of experimental realization and scalability,which hinders the fundamental research development and the potential to revolutionize quantum ***,we report the first experimental synthesis of quasi-one-dimensional InNbS_(2)nanoribbons that exhibit the coexistence of topological order and superconductivity via a chemical vapor transport ***,the inplane upper critical field of InNbS_(2)nanoribbons exceeds the Pauli paramagnetic limit by more than 2.2 times,which can be attributed to the enhanced spin-orbit coupling and the weakened interlayer interaction between the NbS_(2)layers induced by the insertion of In atoms,making InNbS_(2)exhibit spin-momentum locking similar to that of monolayer NbS_(2).Moreover,for the first time,we report the superconducting diode effect in a quasi-one-dimensional superconductor system without any inherent geometric *** measured maximum efficiency is manifested as 14%,observed atμ0H≈±60 mT,and we propose that the superconducting diode effect can potentially be attributed to the presence of the nontrivial topological *** work provides a platform for studying exotic phenomena in condensed matter physics and potential applications in quantum computing and quantum information processing.

关键词： topological order superconductivity nanoribbon superconducting anisotropy superconducting diode

来源：评论

学校读者我要写书评

暂无评论

Fluconazole adsorption and release study using KIT-6 for targeted and controlled drug delivery system

引用

Materials Research Innovations 2025年第2期29卷 64-74页

作者： Kumari, Sushma Ahuja, Munish Duhan, Surender Drug Delivery System Lab Department of Physics Deenbandhu Chhotu Ram University of Science and Technology Sonepat India Drug Delivery Research Laboratory Department of Pharmaceutical Sciences Guru Jambheshwar University of Science and Technology Hisar India

This study presents the development of a mesoporous silica, i.e. KIT-6 synthesised using the hydrothermal technique, followed by the loading of fluconazole as the model drug using the post-impregnation method. The results of drug entrapment studies exposed that 76% of the drug was entrapped in the silica matrix. The drug release rate was investigated in phosphate buffer with pH = 6.8. The fluconazole-loaded KIT-6 prolonged the drug’s release for 12 hours, ensuring Higuchi’s square root kinetics, with diffusion via the matrix as the releasing mechanism, which revealed that the release rate was under control. The MTT assay-based biocompatibility experiments on Vero cells show that the pure and drug-loaded composite systems have minimal cytotoxicity. Hence, drug delivery and adsorption may be facilitated, and repeated administration of drugs is reduced by a controlled drug release rate using the prepared silicious composite. © 2024 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Controlled drug delivery

来源：评论

学校读者我要写书评

暂无评论

Study of the response of 10B-doped MCP to wide-energy range neutrons from eV to MeV

引用

Nuclear science and Techniques 2024年第8期35卷 132-141页

作者： Qiang Li Li‑Jiao Wang Xiang‑Biao Qiu Jing‑Wen Li Wei Xu Tao Li Ze‑Bin Lin Chang‑Jun Ning Yong‑Hao Chen Rui‑Rui Fan Kang Sun Jing‑Yu Tang Rong Zhang Han‑Tao Jing Bo Mei Qi An Hao‑Fan Bai Jiang‑Bo Bai Jie Bao Ping Cao Qi‑Ping Chen Zhen Chen Zeng‑Qi Cui An‑Chuan Fan Chang‑Qing Feng Fan‑Zhen Feng Ke‑Qing Gao Min‑Hao Gu Chang‑Cai Han Zi‑Jie Han Guo‑Zhu He Yong‑Cheng He Yang Hong Yi‑Wei Hu Han‑Xiong Huang Wei‑Hua Jia Hao‑Yu Jiang Wei Jiang Zhi‑Jie Jiang Zheng‑Yao Jin Ling Kang Bo Li Chao Li Gong Li Jia‑Wen Li Xiao Li Yang Li Jie Liu Rong Liu Shu‑Bin Liu Guang‑Yuan Luan Bin‑Bin Qi Jie Ren Zhi‑Zhou Ren Xi‑Chao Ruan Zhao‑Hui Song Zhi‑Xin Tan Sheng‑Da Tang Peng‑Cheng Wang Zhao‑Hui Wang Zhong‑Wei Wen Xiao‑Guang Wu Xuan Wu Li‑Kun Xie Yi‑Wei Yang Han Yi Yong‑Ji Yu Guo‑Hui Zhang Lin‑Hao Zhang Mo‑Han Zhang Qi‑Wei Zhang Xian‑Peng Zhang Yu‑Liang Zhang Yue Zhang Zhi‑Yong Zhang Mao‑Yuan Zhao Lu‑Ping Zhou Zhi‑Hao Zhou Ke‑Jun Zhu Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Dongguan Songshan Lake Future School Dongguan 523808China North Night Vision Science&Technology(Nanjing)Research Institute Co.Ltd. Nanjing 211106China Sino‑French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China 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 Data China Institute of Atomic EnergyBeijing 102413China USTC Archaeometry Lab University of Science and Technology of ChinaHefei 230026China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China

Neutron-sensitive microchannel plates(nMCPs)have applications in neutron detection,including energy spectrum measurements,neutron-induced cross sections,and neutron imaging.10B-doped MCPs(B-MCPs)have attracted significant attention owing to their potential for exhibiting a high neutron detection efficiency over a large neutron energy *** spatial and temporal resolutions are useful for neutron energy-resolved ***,their practical applications still face many technical *** this study,a B-MCP with 10 mol%10B was tested for its response to wide-energy neutrons from eV to MeV at the Back-n white neutron source at the China Spallation Neutron *** neutron detection efficiency was calibrated at 1 eV,which is approximately 300 times that of an ordinary MCP and indicates the success of 10 B *** factors that caused the reduction in the detection efficiency were simulated and *** neutron energy spectrum obtained using B-MCP was compared with that obtained by other measurement methods,and showed very good consistency for neutron energies below tens of *** response is more complicated at higher neutron energy,at which point the elastic and nonelastic reactions of all nuclides of B-MCP gradually become *** is beneficial for the detection of neutrons,as it compensates for the detection efficiency of B-MCP for high-energy neutrons.

关键词： Neutron radiation image 10B-doped MCP Neutron response Wide-energy range neutrons

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：