检索结果-内蒙古大学图书馆

A Positive and Negative-Sequence Equivalent Circuit Model for Linear Induction Machine Adapted to Urban Rail Transit

引用

IEEE Transactions on Transportation Electrification 2025年

作者： Guo, Yingcong Xu, Wei Ge, Jian Shangguan, Yongdao Xiao, Han Tang, Yirong Southwest Jiaotong University School of Electrical Engineering Chengdu610031 China Beijing100190 China University of Chinese Academy of Sciences School of Electronic Electrical and Communication Engineering Beijing101408 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China

The equivalent circuit model is a crucial tool for estimating the performance of linear induction machines (LIMs), and it is widely used in design, optimization, etc. However, the conventional model which does not account for the asymmetrical current is not as precise in certain scenarios. Such asymmetrical current is caused by the inherent end effect in LIMs, which persists even when the machine is powered by a symmetrical voltage source. In this paper, a novel equivalent circuit model is proposed to enhance the precision of analyzing LIMs performance under asymmetrical current. Firstly, the relationship between current, back electro-motive force (EMF) and voltage is established by analyzing the positive and negative-sequence airgap magnetic field. Secondly, the excitation source is converted from symmetrical phase voltage to positive and negative-sequence current by solving the circuit constraint equation. Finally, a positive and negative-sequence equivalent circuit model is constructed and the LIM performance is further analyzed. The proposed model is thoroughly validated through comparison with other methods and experimental data. © 2015 IEEE.

关键词： Urban transportation

来源：评论

学校读者我要写书评

暂无评论

Synergistic effects of precursor reduction and ion migration blocking result in highly sensitive MAPbI₃ X-ray detectors with a low detection limit

引用

Journal of Materials Chemistry C 2025年第10期13卷 5317-5325页

作者： Jiang, Long Xue, Chengzhi Cheng, Jiatian Li, Nan Fan, Xinyu Yang, Yuanbo Li, Tiantian Li, Liwei Liu, Yucheng Feng, Jiangshan Liu, Shengzhong Yang, Zhou State Key Laboratory of Oil and Gas Equipment CNPC Tubular Goods Research Institute Shaanxi Xi’an 710077 China 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 Xi'an 710119 China Dalian Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Dalian 116023 China Dalian National Laboratory for Clean Energy iChEM Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

Lead halide perovskites have emerged as promising materials for sensitive, low-dose-rate X-ray imaging. However, the dark current drift caused by ion migration poses challenges to their long-term operational stability and performance. To address this issue, we explored the synergistic effects of precursor reduction and ion migration blocking. Reducing the precursor solution decreases the defect density, enhancing the carrier lifetime and mobility-lifetime product, thus boosting X-ray sensitivity. However, this approach alone does not effectively suppress dark current drift. By incorporating an ion migration blocker, the optimized device exhibits a significantly reduced dark current drift of 3.62 × 10⁻⁴ nA cm⁻¹ s⁻¹ V⁻¹, an improved X-ray sensitivity of 1.22 × 10⁵ μC Gy_air⁻¹ cm⁻² and a low detection limit of 3.93 nGy_air s⁻¹ under a 40 kV X-ray source and 12.66 V mm⁻¹ electrical field, positioning it among the best of polycrystalline perovskite X-ray detectors. Additionally, it can capture a clear X-ray image of a metal key at an X-ray dose of 2.85 μGy_air s⁻¹, highlighting its potential for low-dose X-ray imaging applications. © 2025 The Royal Society of Chemistry.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Microstructure, wear and corrosion behaviors of TC21 titanium alloy by solid powder-packing boriding and aluminizing

引用

Journal of Materials Research and technology 2025年 36卷 6387-6399页

作者： Yuwei Guo Ziqiang Wang Na Li Shankai Yang Yuyu Wu Yonghua Duan Ancang Yang Lishi Ma Shanju Zheng Yunping Li Faculty of Material Science and Engineering Yunnan Key Laboratory of Integrated Computational Materials Engineering for Advanced Light Alloys Kunming University of Science and Technology Kunming 650093 China State Key Lab for Powder Metallurgy Central South University Changsha 410083 China

In this work, TC21 titanium alloy was treated using solid powder-packing infiltration method with single boriding, single aluminizing and first-stage boriding and second-stage aluminizing (B–Al). The microstructure of the infiltration layer was characterized by scanning electron microscopy, X-ray diffraction, and electron probe microanalysis. The results indicate that the B–Al layer combines the microstructural characteristics of boriding and aluminizing, consisting of an outer TiB 2 layer, dispersed TiB whiskers + Al 3 Ti layer, and a diffusion transition zone. The measured hardness, wear and corrosion behaviors show that the specimen treated with first-stage boriding and second-stage aluminizing has high surface hardness, good wear resistance, and great corrosion resistance. Finally, the corrosion mechanism was also discussed.

关键词： TC21 alloy Boriding Aluminizing Boriding and aluminizing Wear behavior Corrosion behavior

来源：评论

学校读者我要写书评

暂无评论

Fabrication and characterization of mullite fiber-based porous ceramics with mixed fiber lengths for high-temperature gas filtration

引用

Ceramics International 2025年

作者： Zheng, Dazhi Zhu, Ruijian Hu, Yuwen Liang, Shiou Sun, Huiying Wang, Zengmei State Key Laboratory of Engineering Materials for Major Infrastructure Jiangsu Key Lab. of Construction Materials School of Materials Science and Engineering Southeast University Nanjing211189 China School of Materials Science and Engineering Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing Institute of Technology Nanjing211167 China

The emissions and particulate pollutants (PM) from industrialization and other human activities have become a significant threat to human health. Researchers have experimented with various fiber-bonded filters, but there are still relatively few products with good high-temperature resistance. In this paper, a fiber-bonded porous ceramic with high porosity was prepared by vacuum filtration combined with freeze-drying using two homemade mullite fibers with different length-to-diameter ratios as raw materials and mullite sol as binder. When the content of fine fibers is 40 %, the product has a better overall performance, its density is 0.63g/cm3, porosity is 74 %, strength is 0.77 MPa, thermal conductivity is 0.153 W m−1 K−1. When the airflow rate of 2 L/min, the pressure drop is 80 Pa, the filtration efficiency of about 99 %, the QF is 0.08 pa−1, The mullite fiber-bonded porous ceramics prepared through a simple process exhibit excellent filtration performance, offering a wide range of potential applications. © 2025

关键词： Thermal conductivity of gases

来源：评论

学校读者我要写书评

暂无评论

Reconfigurable Converter-Formed Soft Open Point- Assisted Dynamic Restoration for Distribution Systems with Cold-load Pickup

引用

IEEE Transactions on Sustainable Energy 2025年

作者： Yang, Xiaodong Li, Zihao Ding, Lijian Hu, Zhengli Fang, Hui Sun, Wei Wu, Qiuwei Wen, Jinyu Hefei University of Technology State Key Laboratory of High Efficiency and High Quality Electric Energy Conversion Hefei230009 China State Grid Anhui Ultra High Voltage Company Hefei230022 China Tsinghua University Tsinghua-Berkeley Shenzhen Institute Tsinghua Shenzhen International Graduate School Shenzhen518055 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

Improving the power supply resilience under extreme conditions is an important construction goal faced by modern distribution systems (DSs). In this paper, we develop a dynamic restoration framework for renewable DSs with cold-load pickup (CLPU), assisted by the reconfigurable converter-formed multi-terminal soft open point (R-SOP) to minimize the de-energized loads and renewables curtailment under extreme weather events. Traditional SOP often designed as symmetric capacity topology, which may limit the DS restoration quality by the converter capacity of symmetric SOPs. To address this, a dynamic network reconfiguration model of DSs is established that embedded with R-SOP, whose typical feature is the asymmetric converter capacity design while keeping the total port capacity unchanged compared with traditional SOP. On this basis, a multi-period distribution service restoration model is formulated integrating the converter reconfiguration of R-SOP, DS topology changes and coordinated actions of flexible resources to enhance the restoration level and improve the renewable energy utilization. Moreover, restoration strategies that ignore the CLPU phenomenon may face remarkable gap from the realistic system operating conditions. Accordingly, a frequency-constrained dynamic restoration model is proposed in a faster-timescale to respond to the CLPU and restore the DS in a reliable and adaptable manner. Numerical simulations on two modified IEEE test systems and an actual distribution system verify the effectiveness of the developed framework. © 2010-2012 IEEE.

关键词： Restoration

来源：评论

学校读者我要写书评

暂无评论

Study on Gas Production Characteristics of Thermally Aged Composite Insulator Core Rods Under Vacuum Conditions 1st

Study on Gas Production Characteristics of Thermally Aged Co...

引用

1st Electrical Artificial Intelligence Conference, EAIC 2024

作者： Xiaogang, Li Dandan, Zhang Ji, Wang Kexin, Shi Zhao, Chen Xiang, Cai Gaoli, Song Zhiyu, Wan Henan Jiuyu EPRI Electric Power Technology Co. Ltd. Zhengzhou450052 China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Ministry of Education Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan430074 China Disaster Prevention and Reduction Center State Grid Hunan Electric Power Company Limited Changsha410000 China

ISBN: (纸本)9789819640669

Given the extensive utilization of composite insulators in electricity systems, the unresolved decay-like fragmentation of the composite insulator is of paramount importance in the preservation of the system’s functionality in daily life. The core rod’s gas production during the thermal aging process has been verified, which may result in the silicone rubber sheath deforming and potentially rupturing. This study has created an innovative vacuum thermal aging experiment platform that enables the conduct of thermal aging tests under vacuum conditions, thereby further elucidating the process of gas generation and its consequential impact. In addition, this platform is capable of accurately monitoring and recording the gas pressure value in the heating chamber in real time, as well as gathering the gases generated by the thermal degradation of composite insulator core rods. The experimental results elucidate the characteristics of gas production, with a particular emphasis on the thermal press. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Gas fuel manufacture

来源：评论

学校读者我要写书评

暂无评论

An Investigation into the Products of Thermally Aged Composite Insulator Core Rods 1st

An Investigation into the Products of Thermally Aged Composi...

引用

1st Electrical Artificial Intelligence Conference, EAIC 2024

ISBN: (纸本)9789819640669

Chinese regions exhibit a highly uneven distribution of substantial energy re-serves and significant electrical energy loads. The actual situation necessitates the electricity system to depend increasingly significantly on transmission lines, in which composite insulators play a vital role. Historically, conventional fractures have been well treated, but the more recent type of fracture known as decay-like fracture is currently being investigated. In the event of a fracture, mishaps such as transmission line dropping may arise, leading to the termination of power supply and failure to restore it promptly. In order to effectively prevent the occurrence of decay-like fractures, researchers are currently endeavoring to understand the mechanism of this fracture, including its specific initiation point and the process of degradation. Drawing from prior research, heat has been identified as a reliable indicator of fracture occurrence. The objective of this work is to determine the impact of thermal stress by examining products during the process of thermal aging. Experimental trials are conducted at various temperatures for a duration of 5 h. Following testing, samples and products obtained from studies are subjected to additional observation and analysis using Fourier Transform Infrared spectroscopy (FTIR) and Gas Chromatography Mass Spectrometry (GC-MS). This work quantifies the chemical composition of the related gaseous products and compares the FTIR results of samples before and after trials to determine the changes in functional groups. Analytical findings can serve as the foundation for further investigation of the decay-like fracture mechanism, namely the process of fracture intensification. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Gas chromatography

来源：评论

学校读者我要写书评

暂无评论

Ce3+-doped glass scintillator with high density and light yield for imaging application

引用

Ceramics International 2025年第15期51卷 19780-19786页

作者： Yang, Dong Ge, Kun Ban, Huiyun Yuan, Huiping Qian, Sen Hua, Zhehao Cai, Hua Chen, Danping Han, Jifeng Qiao, Xvsheng Ren, Jing Sun, Xinyuan Tang, Gao Yin, Shenghua Zhang, Minghui Xiao, Jiawen Beijing Glass Research Institute Beijing101111 China Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Particle Detection and Electronics Beijing100049 China State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan430070 China China Building Materials Academy Beijing100024 China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Key Lab of Radiation Physics and Technology of MOE Sichuan University Chengdu610065 China Key Laboratory of Rare Earths Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341003 China State Key Laboratory of Silicon and Advanced Semiconductor Materials & Department of Materials Science and Engineering Zhejiang University Hangzhou310027 China College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin150001 China Department of Physics and Key Laboratory of Jiangxi Province for Special Optoelectronic Artificial Crystal Materials Jinggangshan University Ji'an343009 China College of Materials and Chemistry China Jiliang University Hangzhou310018 China Nuclear Instrument CO. LTD. Beĳing100176 China Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai201899 China College of Materials Science and Engineering Beijing University of Technology Beijing100124 China

A series of Ce3+-doped Gd2O3-GdF3-Al2O3-B2O3-SiO2 glass scintillators (GSCx and GLCx) were successfully synthesized in reducing atmosphere for future imaging application. The transmittance of GSCx glasses exceeds 85 % in range of 500–800 nm, and the cut-off edge red shifts as the Ce3+ concentration increases. In photoluminescence (PL), GSCx glass scintillators have a 360–600 nm broadband emission with a shoulder peak at around 450 nm. Meanwhile, the PL lifetime of GSCx glasses is close to the CeF3 crystals, and the PL QY of GSC3 glass scintillator reaches up 70.2 %. For scintillation application, the integral XEL intensity of GSC2 and GSC3 glasses is 31.3 % and 24.4 % of that of BGO crystal. GLC2 and GLC3 glasses exhibit similar spatial resolution of approximately 7 lp·mm−1. Moreover, the light yields of GSC2 and GSC3 glass scintillator are 1702 and 1690 ph/MeV excited by γ-ray, respectively. The nonproportionality of GSCx glasses is less than 3 % in the range of 100–1400 keV due to the large density and Zeff. As Ce3+ concentration increases, both the fast and slow components of the glasses decrease (103.7 ns–89.7 ns, 1454.4 ns–1012.8 ns), and the proportion of fast component also increased from 3.3 % to 4.7 %. For γ-ray imaging, the scintillation light events of the glass can be observed from SiPM array, and the central position (−2, −1) have the highest count rate of the system. The results show that GSCx and GLCx glass scintillators deserve further development for future applications. © 2025

关键词： Gamma rays

来源：评论

学校读者我要写书评

暂无评论

Low-input redoxomics facilitates global identification of metabolic regulators of oxidative stress in the gut

引用

Signal Transduction and Targeted Therapy 2025年第2期10卷 885-902页

作者： Xina Xiao Meng Hu Li Gao Huan Yuan Baochen Chong Yu Liu Rou Zhang Yanqiu Gong Dan Du Yong Zhang Hao Yang Xiaohui Liu Yan Zhang Huiyuan Zhang Heng Xu Yi Zhao Wenbo Meng Dan Xie Peng Lei Shiqian Qi Yong Peng Tao Tan Yang Yu Hongbo Hu Biao Dong Lunzhi Dai National Clinical Research Center for Geriatrics State Key Laboratory of BiotherapyWest China HospitalSichuan UniversityChengduChina Advanced Mass Spectrometry Center Research Core FacilityFrontiers Science Center for Disease-Related Molecular NetworkNHC Key Lab of Transplant Engineering and ImmunologyWest China HospitalSichuan UniversityChengduChina School of Life Sciences Tsinghua UniversityBeijingChina Department of Rheumatology and Immunology West China HospitalSichuan UniversityChengduChina The First School of Clinical Medicine Lanzhou UniversityLanzhouChina State Key Laboratory of Primate Biomedical Research Institute of Primate Translational MedicineKunming University of Science and TechnologyKunmingChina Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology and Key Laboratory of Assisted Reproduction Ministry of EducationCenter for Reproductive MedicineDepartment of Obstetrics and GynecologyPeking University Third HospitalBeijingChina Frontiers Medical Center Tianfu Jincheng LaboratoryChengduChina

Oxidative stress plays a crucial role in organ aging and related diseases, yet the endogenous regulators involved remain largelyunknown. This work highlights the importance of metabolic homeostasis in protecting against oxidative stress in the large *** developing a low-input and user-friendly pipeline for the simultaneous profiling of five distinct cysteine (Cys) states, includingfree SH, total Cys oxidation (Sto), sulfenic acid (SOH), S-nitrosylation (SNO), and S-glutathionylation (SSG), we shed light on Cysredox modification stoichiometries and signaling with regional resolution in the aging gut of monkeys. Notably, the proteinsmodified by SOH and SSG were associated primarily with cell adhesion. In contrast, SNO-modified proteins were involved inimmunity. Interestingly, we observed that the Sto levels ranged from 0.97% to 99.88%, exhibiting two distinct peaks and increasingwith age. Crosstalk analysis revealed numerous age-related metabolites potentially involved in modulating oxidative stress and Cysmodifications. Notably, we elucidated the role of fumarate in alleviating intestinal oxidative stress in a dextran sulfate sodium (DSS)-induced colitis mouse model. Our findings showed that fumarate treatment promotes the recovery of several cell types, signalingpathways, and genes involved in oxidative stress regulation. Calorie restriction (CR) is a known strategy for alleviating oxidativestress. Two-month CR intervention led to the recovery of many antioxidative metabolites and reshaped the Cys redoxome. Thiswork decodes the complexities of redoxomics during the gut aging of non-human primates and identifies key metabolic regulatorsof oxidative stress and redox signaling.

关键词： metabolic homeostasis total cys oxidation cysteine modifications sulfenic acid gut aging redoxomics oxidative stress

来源：评论

学校读者我要写书评

暂无评论

Super-Resolution of Diffusion-Weighted Images via TDI-Conditioned Diffusion Model 15th

Super-Resolution of Diffusion-Weighted Images via TDI-Cond...

引用

15th International Workshop on Computational Diffusion MRI, CDMRI 2024, held in conjunction with 27th International Conference on Medical Image Computing and Computer-Assisted Intervention, MICCAI 2024

作者： Ma, Jiquan Teng, Yujun Chen, Geng Jiang, Haotian Zhang, Kai Liu, Feihong Rekik, Islem Shen, Dinggang School of Computer Science and Technology Heilongjiang University Harbin China National Engineering Laboratory for Integrated Aero-Space-Ground-Ocean Big Data Application Technology School of Computer Science and Engineering Northwestern Polytechnical University Xi’an China School of Biomedical Engineering and State Key Laboratory of Advanced Medical Materials and Devices ShanghaiTech University Shanghai China School of Information Science and Technology Northwest University Xi’an China BASIRA Lab Imperial-X and Department of Computing Imperial College London London United Kingdom

ISBN: (纸本)9783031869198

Diffusion-Weighted Imaging (DWI) is a significant technique for studying white matter. However, it suffers from low-resolution obstacles in clinical settings. Post-acquisition Super-Resolution (SR) can enhance the resolution of DWIs and has gained increasing research interest in recent years. An advanced generative model, the Diffusion Model (DM), exhibits particularly promising performance in image SR. However, effective conditions are required to bootstrap the DM for DWI SR. To this end, we proposed the first DM-based DWI SR model with two effective conditions based on low-solution DWIs and Track Density Imaging (TDI) maps, which possess rich high-resolution prior knowledge Additionally, we consider another condition based on features from low-resolution DWIs. These two conditions are integrated into our model, which comprises three components: DWI Resolution Enhancer (DRE), DWI Feature Extractor (DFE), and TDI Feature Extractor (TFE). DRE combines low-resolution DWI features from DFE with TDI features from TFE to progressively generate high-resolution DWIs. We performed extensive experiments on DWIs of normal subjects from human connectome projects and patients with Parkinson’s disease. The results demonstrate that our model outperforms existing DWI SR models, both qualitatively and quantitatively. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Neurodegenerative diseases

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：