检索结果-内蒙古大学图书馆

Thermodynamic Analysis and Optimization of Nuclear Closed Air Brayton Cycle 1

23rd Pacific Basin Nuclear Conference, PBNC 2022

作者： Fang, Huawei Yi, Jingwei Zhang, Xiaoyu Liang, Tiebo Qian, Yiran Tang, Xin Chen, Weixiong Key Laboratory of Nuclear Reactor System Design Technology Nuclear Power Institute of China Sichuan Chengdu China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Shaanxi Xi’an China

ISBN: (数字)9789811988998

ISBN: (纸本)9789811988981

In order to improve the flexibility and adaptability of micro nuclear power systems, air is considered as an optional working fluid of nuclear Brayton cycle. It has ability to avoid shortage of working fluid under extreme conditions, and ensure the system operating with tight supply. Compared with the traditional open cycles, the closed cycle has advantages of higher cycle efficiency, smaller equipment size and higher power density. Few of closed air power cycle in nuclear power system has been studied by now. In this paper, cycle parameters were analyzed and designed, and optimal cycle performance was compared between cycle constructions. Four closed air Brayton cycles are proposed and modeled in EBSILON 15.0, including simple regenerative cycle (SRC), intercooling regenerative cycle (IRC), reheat regenerative cycle (RRC) and intercooling-reheat regenerative cycle (IRRC). Thermodynamic analysis of the key parameters is conducted, including pressure ratio, turbine inlet temperature, compressor inlet temperature and pressure. In addition, the genetic algorithm (GA) is applied for multi-parameters optimization for the maximal cycle efficiency. Result shows that with the increase of pressure ratio, the efficiency of SRC increases firstly and then decreases. With the increase of turbine inlet temperature, the pressure ratio corresponding to the maximal cycle efficiency increases gradually. Specific work gradually increases with pressure ratio. In higher turbine inlet temperature, the rising velocity of specific work is faster. Cycle efficiency increases with compressor inlet pressure, and this trend tend to be slower in high pressure region. With the increasing of compressor inlet pressure, optimal pressure ratio decreases and finally approaches to 2.0. The cycle minimal cycle pressure was selected as 6 MPa. Maximal efficiency and corresponding pressure ratio increase with turbine inlet temperature increasing and decrease with compressor inlet temperature increasing. Co

关键词： Air

来源：评论

学校读者我要写书评

暂无评论

“Superimposed”spectral characteristics of fluorophores arising from cross-conjugation hybridization

引用

Chinese Chemical Letters 2025年第1期36卷 442-446页

作者： Kai An Qinglong Qiao Lovelesh Syed Ali Abbas Abedi Xiaogang Liu Zhaochao Xu CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China Fluorescence Research Group Singapore University of Technology and DesignSingapore 487372Singapore

The demand for enhanced optical properties in advanced fluorescence technologies has driven research into the structure-property relationship of *** this paper,we use naphthalene fluorophores Na DC-Aze and PhDO-Aze as a case study to emphasize the pivotal role of cross conjugation in tuning the optical structure-property *** DC-Aze and PhDO-Aze,formed by hybridizing two distinct conjugated systems in a single naphthalene molecule,exhibit spectral characteristics from both conjugated *** data and theoretical calculations demonstrate the coexistence of two electron-delocalization systems in a cross-conjugation manner in both Na DC-Aze and *** cross-conjugation fluorophores exhibit high brightness,large Stokes shift,and a broad absorption wavelength range by combining distinct spectral properties from its parent *** spectral properties will be advantageous for certain applications(i.e.,panchromatic absorption in organic solar cells,and fluorophores compatible with a wide range of excitation wavelengths).

关键词： Fluorophore Cross conjugation Absorption Emission Naphthalene

来源：评论

学校读者我要写书评

暂无评论

Tuning the number of chiral edge channels in a fixed quantum anomalous Hall system

引用

Physical Review B 2024年第20期109卷 L201402-L201402页

作者： Peng Deng Yulei Han Peng Zhang Su Kong Chong Zhenhua Qiao Kang L. Wang Beijing Academy of Quantum Information Sciences Beijing 100193 China Department of Electrical and Computer Engineering University of California Los Angeles California 90095 USA Department of Physics Fuzhou University Fuzhou Fujian 350108 China International Center for Quantum Design of Functional Materials CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics and Department of Physics University of Science and Technology of China Anhui 230026 China Hefei National Laboratory University of Science and Technology of China Hefei 230088 China

Quantum anomalous Hall (QAH) insulators exhibit chiral edge channels characterized by vanishing longitudinal conductance and quantized Hall conductance of Ce2/h, wherein the Chern number C is an integer equal to the number of the parallel chiral edge channels. These chiral edge channels conduct dissipationless transport in QAH insulators, making them pivotal for applications in low-consumption electronics and topological quantum computing. While the QAH effect with multiple chiral edge channels (i.e., C > 1) has been demonstrated in multilayers consisting of magnetic topological insulators and normal insulators, the channel number remains fixed for a given sample. Here, we unveil the tunability of the number of chiral edge channels within a single QAH insulator device. By tuning the magnetization of individual layers within the multilayer system, Chern insulating states with different Chern numbers are unveiled. The tunable Chern number was corroborated by our theoretical calculations. Furthermore, we conducted layer-dependent calculations to elucidate the contribution of the Chern number from different layers in the multilayer. Our findings demonstrate an extra degree of freedom in manipulating the chiral edge channels in QAH insulators. This tunability offers an extra dimension for the implementation of the QAH-based multichannel dissipationless transport.

关键词： Quantum anomalous Hall effect Quantum transport Topological insulators Molecular beam epitaxy

来源：评论

学校读者我要写书评

暂无评论

Modulating Electromagnetic Genes Through Bi-Phase High-Entropy Engineering Toward Temperature-Stable Ultra-Broadband Megahertz Electromagnetic Wave Absorption

引用

Nano-Micro Letters 2025年第07期 262-277页

作者： Xiaoji Liu Yuping Duan Nan Wu Guangming Li Yuan Guo Jiangyong Liu Ning Zhu Qiang Wang Lin Wang Zichen Xu Hao Wei Guojun Wang Zhijia Zhang Songsong Zhang Wenjun Zhou Teng Ma Tongmin Wang Qingdao Innovation and Development Base of Harbin Engineering University Harbin Engineering University Key Laboratory of Solidification Control and Digital Preparation Technology School of Materials Science and EngineeringDalian University of Technology National Key Laboratory of Electromagnetic Effect and Security On Marine Equipment China Ship Development and Design Center Wuhan Second Ship Design and Research Institute

Magnetic absorbers with high permeability have significant advantages in lowfrequency and broadband electromagnetic wave （EMW） ***,the insufficient magnetic loss and inherent high conductivity of existing magnetic absorbers limit the further expansion of EMW absorption ***,the spinel （FeCoNiCrCu）3O4high-entropy oxides （HEO） are successfully constructed on the surface of FeCoNiCr0.4Cu0.2high-entropy alloys （HEA） through low-temperature oxygen bath *** the one hand,HEO and HEA have different magnetocrystalline anisotropies,which is conducive to achieving continuous natural resonance to improve magnetic *** the other hand,HEO with low conductivity can serve as an impedance matching layer,achieving magneto-electric *** the thickness is 5 mm,the minimum reflection loss （RL） value and absorption bandwidth （RL<-5 d B） of bi-phase high-entropy composites （BPHEC） can reach-12.8 d B and 633 MHz,*** RCS reduction value of multilayer sample with impedance gradient characteristic can reach 18.34 d B *** addition,the BPHEC also exhibits temperaturestable EMW absorption performance,high Curie temperature,and oxidation *** absorption bandwidth maintains between 593 and 691 MHz from-50 to 150℃.This work offers a new and tunable strategy toward modulating the electromagnetic genes for temperature-stable ultra-broadband megahertz EMW absorption.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Emerging theory and phenomena in thermal conduction: A selective review

引用

science China(Physics,Mechanics & Astronomy) 2022年第11期65卷 2-17页

作者： Jie Chen Jia He Dongkai Pan Xiaotian Wang Nuo Yang Jiaojiao Zhu Shengyuan A.Yang Gang Zhang Center for Phononics and Thermal Energy Science China-EU Joint Lab for NanophononicsMOE Key Laboratory of Advanced Microstructured MaterialsSchool of Physics Science and EngineeringTongji UniversityShanghai 200092China School of Energy and Power Engineering Huazhong University of Science and Technology(HUST)Wuhan 430074China School of Physical Science and Technology Southwest UniversityChongqing 400715China Research Laboratory for Quantum Materials Singapore University of Technology and DesignSingapore 487372Singapore Institute of High Performance Computing Agency for ScienceTechnology and Research(A*STAR)Singapore 138632Singapore

Recently, emerging phonon phenomena have been discovered and rapidly developed, which have become an active hot research topic. In this review article, we present state-of-the-art advances in several fascinating phonon transport phenomena. First, we summarize the recent progress on the wave nature of phonons, including phonon coherence and its effects on thermal conductivity and the topological properties of phonons. Then, we discuss the particle nature of phonons, including the weak coupling of phonons and the high-order phonon anharmonicity. Finally, we present the summary and a brief outlook. This review presents the advanced understanding of some emerging phonon phenomena in solid materials, which provides new opportunities for further advancement in a wide variety of applications.

关键词： phonon transport coherence topological phonon high-order phonon interaction

来源：评论

学校读者我要写书评

暂无评论

CHARACTERISTICS OF IRRADIATION PRODUCTION OF RADIOISOTOPE IN AN ULTRA-HIGH FLUX RESEARCH reactor 31

CHARACTERISTICS OF IRRADIATION PRODUCTION OF RADIOISOTOPE IN...

引用

2024 31st International Conference on Nuclear Engineering, ICONE 2024

作者： Li, Jian Xu, Wei Zhao, Jing Liu, Zhihong She, Ding Xie, Heng Shi, Lei Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Tsinghua University Beijing100084 China School of Nuclear Science and Engineering Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy North China Electric Power University Beijing102206 China

ISBN: (纸本)9780791888223

Radioisotopes are widely used in industry, agriculture, healthcare, and other fields, they are important basic materials for nuclear science and technology. The research reactor scheme designed by our institute is characterized by high neutron flux, flexible rector core layout, strong irradiation capability, and convenient operation. It has important applications in nuclear fuel and material irradiation test, radioisotope production, neutron science research, etc. By arranging irradiation targets in the thermal irradiation channels of this reactor to produce radioisotopes, it is expected to obtain satisfactory radioisotope yield. This paper analyzes the characteristics of radioisotope production with the high flux reactor, and the productions of rare isotopes, medical isotopes and industrial isotopes are considered. With the relatively high thermal neutron flux, the target irradiation period could be shortened and the specific activity would be improved. Based on the characteristics of radioisotope conversion, a reasonable arrangement scheme for irradiation targets will help to improve the neutron utilization and isotope production. Copyright © 2024 by *** rights reserved.

关键词： Neutron flux

来源：评论

学校读者我要写书评

暂无评论

Simulation Analysis Thermal Damage Effect of Strong Electromagnetic Pulse on PIN Limiter

Simulation Analysis Thermal Damage Effect of Strong Electrom...

引用

2023 Cross Strait Radio science and Wireless technology Conference, CSRSWTC 2023

作者： Bing, Ruan Dongdong, Wang Wenzhuo, Wang Shengquan, Zheng Xujing, Huang Science and Technology on Electromagnetic Compatibility Laboratory Wuhan430064 China China Ship Development and Design Center Wuhan430064 China

The effects of pulse power and rise time on the performance of PIN limiter and internal temperature of PIN diode have been analyzed through multi-physics modeling simulation. The results show that the leakage power of... 详细信息

ISBN: (纸本)9798350358971

关键词： PIN Limiter Strong Electromagnetic Pulse Thermal Damage Effect

来源：评论

学校读者我要写书评

暂无评论

Action Control and Decision Analysis Based on Reinforcement Learning

Action Control and Decision Analysis Based on Reinforcement ...

引用

2024 IEEE International Conference on Information technology, Electronics and Intelligent Communication Systems, ICITEICS 2024

作者： Shi, Lei Xia, Zhaodan Liu, Xiaojian Wu, Qiong Yang, Sujun Marine Design & Research Institute of China Shanghai200011 China Shanghai Key Laboratory of Ship Engineering Shanghai200011 China Laboratory of Science and Technology on Water Jet Shanghai200011 China

ISBN: (纸本)9798350382693

Motion control and decision analysis play an important role in intelligent robot technology, but there is the problem of inaccurate analysis and positioning. Traditional genetic algorithms cannot solve the problem of control positioning in intelligent robot technology, and the effect is not ideal. Therefore, this paper proposes the positioning and early warning of action control and decision analysis based on reinforcement learning, and analyzes the factor localization and quality early warning. Firstly, Markov's decision theory is used to locate the influencing factors, and the indicators is divided according to the requirements of action control and decision analysis, so as to reduce the interference factors in action control and decision analysis. Then, Markov's decision theory is used to form a reinforcement learning action control and decision analysis scheme, and the results of action control and decision analysis is comprehensively analyzed. The MATLAB simulation results show that under certain evaluation criteria, reinforcement learning is superior to traditional genetic algorithms in terms of accuracy of action control and decision analysis, and time of influencing factors of action control and decision analysis. © 2024 IEEE.

关键词： Adversarial machine learning

来源：评论

学校读者我要写书评

暂无评论

Human Resource Management System design Based on Data Mining Algorithm 1

引用

7th International Conference on Innovative Computing, IC 2024

作者： Shi, Lei Wen, Zhenping Zhou, Xiaokui Xia, Wenjing Yu, Haoliang Marine Design and Research Institute of China Shanghai200011 China Shanghai Key Laboratory of Ship Engineering Shanghai200011 China Laboratory of Science and Technology on Water Jet Shanghai200011 China

ISBN: (数字)9789819741212

ISBN: (纸本)9789819741205

Management system design plays an important role in human resource management, but there is a problem of inaccurate design positioning. The traditional particle swarm algorithm cannot solve the management system problem in human resource management, and the effect is not *** the development of globalization and informationization, enterprises are facing an increasingly fierce competitive environment. As one of the most important resources of an enterprise, the management style and efficiency of human resources directly affect the competitiveness of an enterprise. As an important tool of human resource management, human resource management system (HRM) has been paid more and more attention by enterprises the data mining algorithm management system design scheme is formed by using the data set theory, and the design results of the management system is comprehensively analyzed. The MATLAB simulation results show that under certain evaluation criteria, the data mining algorithm is superior to the traditional particle swarm algorithm in terms of management system design accuracy and time of management system design influencing factors. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Human resource management

来源：评论

学校读者我要写书评

暂无评论

Resonance mechanism of flapping wing based on fluid structure interaction simulation

引用

Chinese Journal of Aeronautics 2024年第5期37卷 243-262页

作者： Yueyang GUO Wenqing YANG Yuanbo DONG Dong XUE National Key Laboratory of Science and Technology on Aerodynamic Design and Research School of AeronauticsNorthwestern Polytechnical UniversityXi'an 710072China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518063China Yangtze River Delta Research Institute of Northwestern Polytechnical University Taicang 215400China

Certain insect species have been observed to exploit the resonance mechanism of their *** order to achieve resonance and optimize aerodynamic performance,the conventional approach is to set the flapping frequency of flexible wings based on the Traditional Structural Modal(TSM)***,there exists controversy among researchers regarding the relationship between frequency and aerodynamic *** that the structural response of wings can be influenced by the surrounding air vibrations,an analysis known as Acoustic Structure Interaction Modal(ASIM)is introduced to calculate the resonant *** this study,Fluid Structure Interaction(FSI)simulations are employed to investigate the aerodynamic performance of flapping wings at modal frequencies derived from both TSM and ASIM *** performance is evaluated for various mass ratios and frequency ratios,and the findings indicate that the deformation and changes in vortex structure exhibit similarities at mass ratios that yield the highest aerodynamic ***,the flapping frequency associated with the maximum time-averaged vertical force coefficient at each mass ratio closely aligns with the ASIM frequency,as does the frequency corresponding to maximum ***,the ASIM analysis can provide an effective means for predicting the optimal flapping frequency for flexible ***,it enables the prediction that flexible wings with varying mass ratios will exhibit similar deformation and vortex structure *** paper offers a fresh perspective on the ongoing debate concerning the resonance mechanism of Flexible Flapping Wings(FFWs)and proposes an effective methodology for predicting their aerodynamic performance.

关键词： Flexible Flapping Wing(FFW) Acoustic Structure Interaction Modal(ASIM) Fluid Structure Interaction(FSI) Resonance mechanism Aerodynamic performance

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：