检索结果-内蒙古大学图书馆

Application Prospect of Fission-Powered Spacecraft in Solar System Exploration Missions

Space(science & technology) 2021年第1期2021卷 309-323页

作者： Y.Xia J.Li R.Zhai J.Wang B.Lin Q.Zhou Beijing Institute of Spacecraft Environment Engineering BeijingChina Science and Technology on Reliability and Environmental Engineering Laboratory BeijingChina Institute of Nuclear and New Energy Technology of Tsinghua University The Key Laboratory of Advanced Reactor Engineering and SafetyMinistry of EducationBeijingChina

Fission power is a promising technology,and it has been proposed for several future space *** is being considered for highpower missions whose goal is to explore the solar system and even *** fission power has made great progress when NASA’s 1 kWe Kilowatt Reactor Using Stirling technology(KRUSTY)prototype completed a full power scale nuclear test in *** success stimulated a new round of research competition among the major space *** article reviews the development of the Kilopower reactor and the KRUSTY system *** summarizes the current missions that fission reactors are being considered as a power and/or propulsion *** projects include visiting Jupiter and Saturn systems,Chiron,and Kuiper belt object;Neptune exploration missions;and lunar and Mars surface base *** studies suggest that the Fission Electric Propulsion(FEP)/Fission Power System(FPS)is better than the Radioisotope Electric Propulsion(REP)/Radioisotope Power System(RPS)in the aspect of cost for missions with a power level that reaches~1 kWe,and when the power levels reaches~8 kWe,it has the advantage of lower *** a mission that travels further than~Saturn,REP with plutonium may not be cost acceptable,leaving FEP the only *** missions prefer the use of FPS because it satisfies the power level of 10’s kWe,and FPS vastly widens the choice of possible landing *** to the current situation,we are expecting a flagship-level fission-powered space exploration mission in the next 1-2 decades.

关键词： satis Saturn isotope

来源：评论

学校读者我要写书评

暂无评论

Passivating buried interface with multifunctional novel ionic liquid containing simultaneously fluorinated anion and cation yielding stable perovskite solar cells over 23% efficiency

引用

Journal of Energy Chemistry 2022年第6期31卷 659-666,I0018页

作者： Deyu Gao Liqun Yang Xiaohui Ma Xueni Shang Chen Wang Mengjia Li Xinmeng Zhuang Boxue Zhang Hongwei Song Jiangzhao Chen Cong Chen School of Material Science and Engineering State Key Laboratory of Reliability and Intelligence of Electrical EquipmentHebei University of TechnologyTianjin 300130China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012JilinChina Chimie ParisTech PSL Research UniversityCNRSInstitut de Recherche de Chimie Paris(IRCP)UMR824711 rue P.et M.CurieF-75005 ParisFrance Key Laboratory of Optoelectronic Technology&Systems(Ministry of Education) College of Optoelectronic EngineeringChongqing UniversityChongqing 400044China

Interfacial defects and energy barrier would result in serious interfacial non-radiative recombination *** addition,the quality of perovskite films is highly dependent on deposition ***,there is an urgent desire to develop multifunctional interface modulators to manage the interface between electron transport layer and perovskite ***,we report a multifunctional buried interface modulation strategy that 4-fluoro-phenylammonium tetrafluoroborate (FBABF_(4)) consisting of simultaneously fluorinated anion and cation is inserted between SnO_(2)layer and perovskite *** is uncovered by time-of-flight secondary ion mass spectroscopy that the anion and cation in modifier are mainly located at this interface,which is put down to coordination bond of the fluorine atom on BF_(4)^(-) with SnO_(2),and the hydrogen bond of the fluorine atom on FBA^(+) with *** suggests that simultaneous fluorination of anion and cation in the ionic liquid molecule is of crucial importance to ameliorate interfacial contact through chemical *** interface modification approach enables the realization of interfacial defect passivation,interfacial energy band alignment modulation,and perovskite crystallization manipulation,which are translated into enhanced efficiency and stability as well as significantly suppressed *** multiple functions of FBABF_(4) endow the modified solar cells excellent photovoltaic performance with an efficiency exceeding 23%along with appealing long-term *** work highlights the critical role of fluorination strategy in engineering multifunctional organic salt modulators for improving interfacial contact.

关键词： Perovskite solar cells Interface engineering Buried interface Ionic liquid Multifunctional

来源：评论

学校读者我要写书评

暂无评论

Multiply charged topological phonons in K2Pb2O3

引用

Physical Review B 2024年第23期109卷 235415-235415页

作者： Chenyang Wang Lei Jin Lu Tian Wei-Wang Yu Xiaoming Zhang Guodong Liu Ying Liu State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China and School of Materials Science and Engineering https://***/018hded08 Hebei University of Technology Tianjin 300130 China

Topological phonons have attracted tremendous attention in recent years, particularly when topological phonons have nonzero topological numbers and exhibit many peculiar physical phenomena. However, studies on the coexistence of different phonons with nonzero topological charge are quite limited. Here, we reveal a realist material K2Pb2O3, which can realize the coexistence of three types of phonons, namely charge-1 Weyl point (WP), charge-2 triple point (TP), and charge-4 WP. We perform symmetry analysis for these points, presenting symmetry conditions to realize these topological phonons, and constructing an effective model to describe them. Meanwhile, we calculate the phonon spectrum, topological surface states, and the constant frequency slice for K2Pb2O3, and we perform the Wilson loop method to calculate the Chern number for WPs and TPs in the material. The results indicate that the material K2Pb2O3 has charge-1 WPs, charge-2 TPs, and charge-4 WPs at high-symmetry points in the range of 13–19 THz. In particular, the phonon spectrum within this range solely contains the bands responsible for forming these topological band-crossing points. The Fermi arcs emanating from the projections of a charge-1 WP, a charge-2 TP, and a charge-4 WP are connected with each other, forming a long Fermi arc extended in the whole Brillouin zone, which greatly facilitates observation in experiment by neutron scatterings or high-resolution electron energy loss spectroscopy. Our work provides a platform for studying charge-1 WP, charge-2 TP, and charge-4 WP in a phononic system.

关键词： Charge Fermi surface Phonons Surface states Topological materials First-principles calculations

来源：评论

学校读者我要写书评

暂无评论

Simulation and experiment of microstrip lines temperature rise based on COMSOL Multiphysics 7

Simulation and experiment of microstrip lines temperature ri...

引用

7th IEEE International Symposium on Electromagnetic Compatibility, ISEMC 2023

作者： Huang, Lijuan Liao, Jinfu Fang, Wenxiao Wang, Jianying School of Electronic and Information Engineering South China Normal University Foshan China Science and Technology on Reliability Physics and Application of Electronic Component Laboratory Guangzhou China School of Integrated Circuit Sun Yat-Sen University Guangzhou China

ISBN: (纸本)9798350333107

Conductor loss and dielectric loss of the microstrip line can lead to temperature rise and limit the power capacity of the microstrip circuit. This involves the interaction (coupling) between the electric and temperature fields. In this study, the factors affecting the temperature rise of the microstrip line were analyzed by means of the parallel plate model. In addition, based on COMSOL Multiphysics simulation software, the influence of dielectric dissipation factor tanδ of microstrip lines of FR4 and RO4350B on the temperature rise per unit input power (TRPIP) was simulated. The simulation results under the set basic parameters show that the TRPIP of the strip conductors of the FR4-substrate microstrip lines with tanδ of 0.02 is about 4.8 °C, and that of RO450B-substrate microstrip lines with tanδ of 0.0037 is about 1.38 °C. Finally, in order to verify the simulation results, a non-invasive measuring device with an infrared camera was constructed to measure the heat distribution on the surface of the microstrip line. © 2023 IEEE.

关键词： Multiphysics

来源：评论

学校读者我要写书评

暂无评论

Accessibility Evaluation Method based on D-H Model and Comfort 31st

Accessibility Evaluation Method based on D-H Model and Comfo...

引用

31st European Safety and reliability Conference, ESREL 2021

作者： Wu, Hongduo D., Zhou Y., Liang Z., Guo Y., Wang School of Reliability and System Engineering Beihang University China State Key Laboratory of Virtual Reality Technology and Systems China State Key Defense Science and Technology Laboratory on Reliability and Environmental Engineering China

ISBN: (纸本)9789811820168

In virtual maintenance, the most widely used accessibility evaluation method is to use virtual human entity accessibility envelope surface to judge and evaluate. However, this method can only give two kinds of evaluation results: reachable and unreachable. There is not enough data and theoretical support for the construction of envelope surface, and the precision and accuracy of evaluation need to be improved. In this paper, a parameterized accessibility evaluation method and the construction method of accessibility envelope surface are proposed. Firstly, a 6-joint and 5-link Denavit-Hartenberg (D-H) link model is established from the waist to the fingertip of the human body, and the range of 10 degrees of freedom and angles of the 4 joints are determined according to ergonomics. Then, the reachable points are generated by Monte Carlo simulation. The accessibility envelope surface is composed of the outermost random reachable points. Then, comfort is introduced to refine the accessibility evaluation level, and a multi-level accessibility evaluation system based on comfort is constructed according to the rapid upper limb assessment (RULA). Finally, the comparison experiment with the reachable envelope provided by DELMIA in virtual environment and real environment shows that the proposed method has better evaluation accuracy and precision. Based on this method, an accessibility evaluation tool has been developed in CATIA and has been applied in some scientific research institutes. © ESREL 2021. Published by Research Publishing, Singapore.

关键词： Ergonomics

来源：评论

学校读者我要写书评

暂无评论

A new structural reliability analysis method in presence of mixed uncertainty variables

引用

Chinese Journal of Aeronautics 2020年第6期33卷 1673-1682页

作者： Lingfei YOU Jianguo ZHANG Xiaosong DU Jie WU School of Reliability and Systems Engineering Beihang University.Beijing 100083China Science and Technology on Reliability and Environmental Engineering Laboratory Beihang UniversityBeijing 100083China

For structures with both random and fuzzy uncertainty,this paper presents a novel method for determining the membership function in fuzzy reliability with the Automatic Updating Extreme Response Surface(AUERS)*** the proposed method,fuzzy variables are initially converted into a value domain under the given cut level and the extreme point in the domain where the reliability reaches its extreme value is ***,the Particle Swarm Optimization(PSO)algorithm is used to determine the extreme point according to the extreme responses for different sets of random sample inputs.A kriging response surface is subsequently constructed between the random variables and the corresponding extreme *** automatic updating strategy is then introduced based on the Relative Mean Square Predicted Error(RMSPE)before performing every iteration of reliability *** adding new sample points,the approximate quality of the kriging response surface is ***,reliability analysis is used to determine the reliability bound under the given cut *** proposed method assures the accuracy and computation efficiency of the mixed uncertainty reliability analysis results while it prevents the solution from becoming trapped in a local optimum,which occurs in classical optimization *** example analyses are used to demonstrate the validity and advantages of the proposed method.

关键词： Automatic updating strat-egy Extreme response surface Membership function Mixed uncertainty Particle swarm optimization Structure reliability

来源：评论

学校读者我要写书评

暂无评论

二维磁性拓扑材料:基础理论、材料实现及应用前景

引用

science Bulletin 2023年第21期68卷 2639-2657,M0006页

作者：张小明王啸天何婷丽王莉蓉玉威旺刘影刘国栋程振祥 State Key Laboratory of Reliability and Intelligence of Electrical Equipment and School of Materials Science and EngineeringHebei University of TechnologyTianjin 300130China School of Physical Science and Technology Southwest UniversityChongqing 400715China Institute for Superconducting and Electronic Materials(ISEM) University of WollongongWollongong 2500Australia

在二维材料的研究中,二维磁性和非平庸拓扑能带成为研究焦点.最近,涌现出一类新型材料体系,被称为二维磁性拓扑材料.它们巧妙地将二维磁性与非平庸拓扑特性相结合,引起人们的广泛研究兴趣.特别是在二维尺度上已推出几种新型磁性拓扑态,... 详细信息

在二维材料的研究中,二维磁性和非平庸拓扑能带成为研究焦点.最近,涌现出一类新型材料体系,被称为二维磁性拓扑材料.它们巧妙地将二维磁性与非平庸拓扑特性相结合,引起人们的广泛研究兴趣.特别是在二维尺度上已推出几种新型磁性拓扑态,如反铁磁拓扑绝缘体/半金属、磁性二阶拓扑绝缘体等.本综述全面分析了目前二维磁性拓扑材料领域的研究进展,包括各类二维磁性拓扑绝缘体、二维磁性拓扑半金属以及完全自旋极化二维拓扑半金属等;系统性地剖析了基础拓扑理论、发展历程、材料实现以及潜在应用.最后,讨论了该领域所面临的挑战与前景,强调了未来在这一引人注目的领域取得更大突破的可能途径.

关键词：拓扑理论拓扑绝缘体半金属新型材料基础理论拓扑特性二维材料自旋极化

来源：评论

学校读者我要写书评

暂无评论

An Artificial Intelligence Near-Field Probe Calibration Method Based on Generative Adversarial Network

An Artificial Intelligence Near-Field Probe Calibration Meth...

引用

IEEE International Wireless Symposium (IWS)

作者： Shan Xue Yangyang Zhou Jiong Tang Yu Liu Weiheng Shao Duo-Long Wu Xinxin Tian Science and Technology on Reliability Physics and Application of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China School of Physics and Optoelectronic Engineering Guangdong University of Technology Guangzhou China

ISBN: (数字)9798350389999

ISBN: (纸本)9798350390001

The near field scanning method specified in the international standard IEC-61967 is an important international diagnostic method for detecting electromagnetic compatibility problems. The near-field probe, as an important part of near-field scanning, mainly detects the magnetic field or electric field. The measurement accuracy of the near field probe directly affects the measurement accuracy of the electromagnetic field on the surface of the device, affecting the accuracy of electromagnetic compatibility diagnostics. To ensure measurement accuracy, it is essential to carry out near-field probe calibration. In this work, we proposed an artificial intelligence probe calibration method based on the generative adversarial networks, which helps improve the difference of calibration parts’ quality difference measurement field and eliminate the unnecessary influence field on the probe performance. Based on the proposed method, we effectively calibrate two kinds of electric field probes, which overcomes the problem of the difference of calibration parts’ quality difference measurement field, and eliminate the influence of unnecessary field to the probe performance.

关键词： Wireless communication Magnetic field measurement Accuracy Electric variables measurement Generative adversarial networks Electromagnetic compatibility Calibration Probes Electric fields Artificial intelligence

来源：评论

学校读者我要写书评

暂无评论

A Weighted Collaborative Prediction Method of RUL for Integrated Circuits in Multi-Failure Modes Based on Transformer

引用

IFAC-PapersOnLine 2023年第2期56卷 7632-7637页

作者： Zibo Zhang Long Jia Xinyu Zou Chang Chen Wei Chen Chunyun Lan Jian Ma Institution of Reliability Engineering Beihang University Beijing 100191 China Science & Technology on Reliability & Environmental Engineering Laboratory Beijing 100191 China School of Reliability and Systems Engineering Beihang University Beijing 10091 China School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China Beijing Aerospace Institute of Automatic Control 100854 Beijing China

Accurately predicting the Remaining Useful Life (RUL) of integrated circuits in multi-failure modes is critical for ensuring the safe and efficient operation of electronic devices. In this paper, we propose a novel RUL prediction method that combines a locally weighted regression method, a Transformer deep neural network, and a multi-failure modes weighted collaborative prediction approach. We first use a locally weighted regression method to eliminate noise from the original feature time series. Then, the feature time series is input into the proposed classification model to classify the failure modes and establish the failure mode weighted function. Finally, the feature time series is fed into the proposed regression model for RUL prediction with weighted processing to obtain accurate RUL predictions. Our experimental results demonstrate that our method effectively captures the degradation information of integrated circuits and generates precise RUL predictions. We demonstrate the efficacy of our method on a circuit stimulation model, showing that it outperforms several state-of-the-art RUL prediction methods. Our proposed method has the potential to enhance the reliability and safety of electronic devices in various applications.

关键词： Integrated circuits RUL prediction multi-failure modes locally weighted regression method Transformer deep neural network weighted collaborative prediction

来源：评论

学校读者我要写书评

暂无评论

Nonsymmorphic symmetry protected spin-orbit semi-Dirac fermions in two dimensions

引用

Physical Review B 2023年第11期107卷 115167-115167页

作者： Weizhen Meng Ying Liu Xiaoming Zhang Zeqing He Wei-Wang Yu Huai Zhang Lu Tian Guodong Liu State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China and School of Materials Science and Engineering Hebei University of Technology Tianjin 300130 China

Semi-Dirac fermions (SDFs) in two-dimensional (2D) systems, which simultaneously exhibit linear and quadratic dispersion around them, are a bridge linking linear and quadratic Dirac cones. However, the so-called SDFs in the reported 2D materials are doubly degenerate (namely semi-Weyl fermions), and are vulnerable against spin-orbital coupling (SOC). Here, we propose a 2D SOC-robust SDF which arises from nonsymmorphic symmetries. Unlike the known 2D SDFs, due to the presence of inversion and time reversal symmetries (IT), each crossing band is doubly degenerate, making the SDF of fourfold degeneracy. By high throughput screening, we find that 26 candidate 2D materials (such as CuCN2, CaI2, TlF) can hold SDFs, which belong to layer groups 40 (pmam), 43 (pbaa), and 45 (pbma), respectively. Furthermore, the symmetry protection mechanism, associated Fermi arc edge states, the catalytic performance, and the topological phase transitions under symmetry breaking of SDFs are revealed, providing a way for understanding 2D SOC-robust SDFs. Overall, our work proposes a class of topological phases, and provides a platform to study their fascinating physical effects.

关键词： Edge states Spin-orbit coupling Topological materials Dirac semimetal

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：