检索结果-内蒙古大学图书馆

Pulsating Torque Suppression of Flux Reversal Machines Based on Specific Harmonic Contributions of Rotor Permeance and PM MMF

引用

IEEE Transactions on Industry Applications 2025年

作者： Li, Junzhou Gao, Yuting Zhang, Chaofeng Zha, Xiaoming Qu, Ronghai Wuhan University School of Electrical Engineering and Automation Wuhan430072 China Key Laboratory of Integrated Energy Power Equipment and System Security Hubei430206 China State Grid Henan Electric Power Research Institute Zhengzhou450052 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

Flux reversal machines (FRMs) exhibit high torque density, but also significant pulsating torque, including cogging torque and torque ripple. Traditional methods fail to separate the harmonics that affect torque density and pulsating torque, leading to a degradation of torque density when reducing pulsating torque. Therefore, to maintain torque density and simultaneously reduce pulsating torque, this paper proposes a novel FRM configuration incorporating shape designs for the rotor and permanent magnets (PMs). First, the key generation mechanisms of cogging torque, average torque, and torque ripple are thoroughly examined, with analytical expressions derived to classify the torque contributions of all air-gap magnetic field harmonics into negative-effect and positive-effect components. Further, the rotor and PM shapes are designed to enhance the positive-effect components and reduce the negative-effect ones of the air-gap permeance and magnetomotive force (MMF). The impacts of geometric parameters are evaluated by using a sensitivity-based hierarchical optimization approach. Then, the proposed FRM is comprehensively compared with a conventional FRM in terms of back-electromotive force (EMF), cogging torque, average torque, torque ripple, efficiency, etc. The results indicate that the proposed machine configuration achieves reductions in cogging torque and torque ripple by 90% and 86.8%, respectively, while maintaining consistent average torque. Finally, a 12-slot/10-pole FRM prototype was built and tested to validate the effectiveness of the proposed machine topology. © 1972-2012 IEEE.

关键词： Permanent magnets

来源：评论

学校读者我要写书评

暂无评论

High-Performance Flexible Magnetic Textile Fabricated Using Porous Juncus effusus Fiber for Biomechanical Energy Harvesting

引用

engineering 2025年第3期46卷 267-277页

作者： Junyao Gong Chunhua Zhang Liangjun Xia Zhaozixuan Zhou Weihao Long Zhuan Fu Sijie Zhou Hua Ji Lixin Du Weilin Xu State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200China College of Textile Science and Engineering Zhejiang University of Science and TechnologyHangzhou 310018China College of Textiles Donghua UniversityShanghai 201620China Winner Medical Co. Ltd.Wuhan 430200China Luthai Textile Co. Ltd.Zibo 255100China

Mechanical energy produced by human motion is ubiquitous,continuous,and usually not utilized,making it an attractive target for sustainable electricity-harvesting *** this study,flexible magnetic-Juncus effusus(M-JE)fibers were prepared from plant-extracted three-dimensional porous Juncus effusus(JE)fibers decorated with polyurethane and magnetic *** M-JE fibers were woven into fabrics and used for mechanical energy harvesting through electromagnetic *** M-JE fabric and induction coil,attached to the human wrist and waist,yielded continuous and stable voltage(2 V)and current(3 mA)during *** proposed M-JE fabric energy harvester exhibited good energy harvesting potential and was capable of quickly charging commercial capacitors to power small electronic *** proposed M-JE fabric exhibited good mechanical energy harvesting performance,paving the way for the use of natural plant fibers in energy-harvesting fabrics.

关键词： Juncus effusus Magnetic fabrics electromagnetic induction Energy harvest Mechanical-electrical energy conversion

来源：评论

学校读者我要写书评

暂无评论

High-quality endoscopic laser speckle contrast imaging with conical fiber illumination

引用

Photonics Research 2025年第3期13卷 583-592页

作者： JUNSHUAI YAN QINXIN HAN LIANGWEI MENG TINGYU SUN YAN YAN SHIJIE FENG SHAOMIN YUAN JINLING LU PENGCHENG LI Britton Chance Center for Biomedical Photonics-MoE Key Laboratory for Biomedical Photonics Advanced Biomedical Imaging Facility-Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and Technology Research Unit of Multimodal Cross Scale Neural Signal Detection and Imaging Chinese Academy of Medical ScienceHUST-Suzhou Institute for Brainsmatics State Key Laboratory of Digital Medical Engineering Key Laboratory of Biomedical Engineering of Hainan ProvinceSchool of Biomedical EngineeringHainan University

Blood flow is essential for maintaining normal physiological functions of the human *** laser speckle contrast imaging (LSCI) can achieve rapid,high-resolution,label-free,and long-term blood flow perfusion velocity monitoring in minimally invasive ***,conventional endoscopic LSCI uses a lowcoherence laser illumination scheme,leading to restricted angles of illumination,compromised laser coherence,uneven laser illumination distribution,and low coupling efficiency,all of which degrade the quality of LSCI in the *** this paper,we propose that conical fiber (CF)-coupled high-coherence laser can be used to achieve large-angle,high-coherence,high-uniformity,and high coupling efficiency laser illumination in the ***,we establish an effective model for calculating the divergence angle of *** phantom and animal experiments,we reveal that laser illumination based on CF markedly enhances endoscopic LSCI *** technology broadens the imaging field of view,enhances the signal-to-noise ratio,enables more sensitive detection of minute blood flow changes,expands the detectable flow range,and improves signal-to-background ratio of endoscopic *** findings suggest that CF-based laser illumination stands as a highly promising advancement in endoscopic LSCI.

关键词： Fiber bundles Laser coupling Laser efficiency Laser glass Single mode lasers Speckle imaging

来源：评论

学校读者我要写书评

暂无评论

High-precision trajectory calibration for robot surface machining by meta-heuristic search algorithm from local error in machining area

引用

The International Journal of advanced Manufacturing technology 2025年第5期138卷 2281-2295页

作者： Bi, Guangde Lu, Lei Zhang, Lei Fan, Cheng Sun, Lining School of Mechanical and Electric Engineering Jiangsu Provincial Key Laboratory of Advanced Robotics Soochow University Suzhou China State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin China

Industrial robots used in complex surface machining are gradually increasing because of their high flexibility and large workspace. However, due to their low geometric accuracy, their application in high-precision surface machining is hindered. In order to improve the machining accuracy, a high-precision robot trajectory calibration method for complex surface machining is proposed. In the machining process, the machining trajectory is usually only within a certain machining area. In the method, high-precision standard balls are set at the boundary of the machining area. Based on the precise position information of these standard balls, the trajectory of the robot in the machining area is calibrated. Compared with the global robot calibration method, the proposed method can calibrate the robot trajectory in the machining area through standard parts, which will improve the trajectory accuracy of the machining robot to the level of repeated positioning accuracy. In this method, a large amount of standard ball data is obtained by the in-place measuring device before the machining process. Then, based on these data, a meta-heuristic search algorithm is used to calibrate the kinematic deviation of the robot measurement and the machining system. The trajectory of the machining robot is adjusted by the kinematic deviation after calibration, and it is applied to the motion control of the machining process to improve the positioning accuracy of the machining trajectory. In the end, to verify the accuracy and practicability of the machining trajectory obtained by this method, measurement and machining experiments are carried out.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Integrating Electric Ambipolar Effect for High-Performance Zinc Bromide Batteries

引用

Nano-Micro Letters 2025年第6期17卷 382-396页

作者： Wenda Li Hengyue Xu Shanzhe Ke Hongyi Zhang Hao Chen Gaijuan Guo Xuanyi Xiong Shiyao Zhang Jianwei Fu Chengbin Jing Jiangong Cheng Shaohua Liu State Key Laboratory of Precision Spectroscopy Engineering Research Center of Nanophotonics and Advanced Instrument(Ministry of Education)School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241People’s Republic of China Department of Chemistry Tsinghua UniversityHaidian DistrictBeijing 100084People’s Republic of China School of Materials Science and Engineering Xinjiang University666 Shengli RoadUrumqi City 830046People’s Republic of China School of Materials Science and Engineering Zhengzhou University75 Daxue RoadZhengzhou 450052People’s Republic of China State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050People’s Republic of China

The coupling of fast redox kinetics,high-energy density,and prolonged lifespan is a permanent aspiration for aqueous rechargeable zinc batteries,but which has been severely hampered by a narrow voltage range and suboptimal compatibility between the electrolytes and ***,we unprecedentedly introduced an electric ambipolar effect for synergistic manipulation on Zn^(2+)ternary-hydrated eutectic electrolyte(ZTE)enabling high-performance Zn-Br_(2)*** electric ambipolar effect motivates strong dipole interactions among hydrated perchlorates and bipolar ligands of L-carnitine(L-CN)and sulfamide,which reorganized primary cations solvation sheath in a manner of forming Zn[(L-CN)(SA)(H_(2)O)_(4)]^(2+)configuration and dynamically restricting desolvated H2O molecules,thus ensuring a broadened electrochemical window of 2.9 V coupled with high ionic ***,L-CN affords an electrostatic shielding effect and an in situ construction of organic-inorganic interphase,endowing oriented Zn anode plating/stripping reversibly for over 2400 ***,with the synergy of electro/nucleophilicity and exceptional compatibility,the ZTE electrolyte dynamically boosts the conversion redox of Zn-Br_(2)batteries in terms of high specific capacity and stable cycling *** findings open a window for designing electrolytes with synergetic chemical stability and compatibility toward advanced zinc-ion batteries.

关键词： Electric ambipolar effect Hydrated eutectic electrolyte Electrostatic shielding Zinc bromide batteries

来源：评论

学校读者我要写书评

暂无评论

The solid-phase synthesis of high-stability SrY2O4 and comparative analysis with Y2O3 in melting Ti-46Al-8Nb alloy

引用

Ceramics International 2025年

作者： Jin, Xingguang Gao, Pengyue Mao, Lu Miao, Han Huang, Jianzhou He, Dongdong Zhang, Zhen Feng, Qisheng Chen, Guangyao Li, Chonghe State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering Shanghai University Shanghai200072 China Shanghai Special Casting Engineering Technology Research Center Shanghai201605 China

The melting and casting of high-reactivity alloy melts pose significant challenges to the refractory crucibles and shell molds, as the interaction between them often leads to contamination and deterioration of the alloy. In this study, SrY2O4 refractory was fabricated via solid-phase synthesis and evaluated for its high-temperature stability to Ti-46Al-8Nb alloy melt by vacuum induction melting and sessile drop wetting tests. The interactions between the alloy and refractory were analyzed using scanning electron microscopy (SEM), X-ray diffraction (XRD), and inductively coupled plasma (ICP) analysis, with results compared to those of Y2O3 refractory. The experimental results revealed several advantages of SrY2O4 refractory over Y2O3 crucible: (i) Reduced surface corrosion, minimal grain boundary damage, lower contamination, (ii) A stratified cross-section and a thin interaction layer after melting, (iii) Fewer and smaller Y2O3 inclusions in the prepared alloys, (iv) Poorer wetting behavior but higher stability to the high-activity alloy, as well as, (v) Lower oxygen content in the prepared alloy. The SrY2O4 refractory demonstrated superior high-temperature stability in melting of high-activity alloys compared to Y2O3 providing valuable insights for overcoming the contamination issue in the re-melting and casting of high-activity alloy. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Titanium alloys

来源：评论

学校读者我要写书评

暂无评论

Divided GHz burst mode amplification to mJ burst energy and kHz burst rate

引用

Chinese Optics Letters 2025年第1期23卷 72-75页

作者： Yunfeng Wu Bowei Yang Zhe Lin Ruoao Yang Xing Chen Yanrong Song Zhigang Zhang School of Physics and Optoelectronic Engineering Beijing University of TechnologyBeijing 100124China State Key Laboratory of Advanced Optical Communication Systems and Networks School of ElectronicsPeking UniversityBeijing 100871China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China

We demonstrated a divided pulse amplification of burst pulse *** intraburst rate is 1 GHz,and the burst rate ranges from 1.5 k Hz to 15 *** the pump power of 100 W,the burst pulse energy is adjustable from 2.2μJ to 2... 详细信息

关键词： burst-mode pulse divided pulse amplification high repetition rate fiber laser

来源：评论

学校读者我要写书评

暂无评论

Immunomodulatory hydrogel neutralizes tumor acidity to augment immune responses for the prevention of post-surgical recurrence of melanoma

引用

Science China Materials 2025年第1期68卷 270-279页

作者： Zhiyuan Quan Linghui Chen Beibei Chen Kangli Guo Pengfei Tian Haobo Pan Yang Li Nana Zhao Fu-Jian Xu State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Key Laboratory of Biomedical Materials of Natural Macromolecules(Beijing University of Chemical Technology) Beijing Laboratory of Biomedical MaterialsBeijing University of Chemical TechnologyBeijing 100029China College of Materials Sciences and Engineering Beijing University of Chemical TechnologyBeijing 100029China Center for Human Tissues and Organs Degeneration Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China

Post-resection recurrence remains a severe problem in melanoma *** therapeutic strategies,such as chemodynamic therapy(CDT),exhibit high specificity and responsiveness,demonstrating potential to elicit antitumor immune responses by triggering immunogenic cell death(ICD).However,the efficacy of CDT still faces challenges from the immunosuppressive tumor microenvironment(TME)characterized by elevated lactate ***,we propose a strategy to construct an immunomodulatory hydrogel to synergistically reprogram tumor-associated macrophages and amplify ICD to inhibit melanoma recurrence after *** hyaluronic acid hydrogel containing borosilicate glasses(BGs)and Fe_(3)O_(4) nanoparticles(HBF hydrogel)are obtained,which can neutralize tumor acidity to reprogram macrophages to M1 ***,the HBF hydrogel induces reactive oxygen species production in melanoma cells,which could induce ICD through CDT and stimulate strong antitumor immune responses,thereby promoting tumor *** cooperative ICD induced by CDT and immunosuppressive TME remodeling leads to effective suppression of tumor *** work provides a promising strategy for immunomodulation-enhanced melanoma therapy through the fabrication of hydrogel to prevent postsurgical tumor recurrence.

关键词： borosilicate glasses tumor microenvironment chemodynamic therapy tumor acidity melanoma immunotherapy

来源：评论

学校读者我要写书评

暂无评论

Grafting anthraquinone on ultrathin C_(3)N_(4) for selective toluene photooxidation

引用

Science China Materials 2025年第3期68卷 785-794页

作者： Xiong Wang Guang-Hui Chen Yang Li Sheng Tian Bing-Hao Wang Biao Hu Xing-Sheng Hu Chao Peng Lang Chen Shuang-Feng Yin Advanced Catalytic Engineering Research Center of the Ministry of Education State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China College of Chemistry and Chemical Engineering Central South University of Forestry and TechnologyChangsha 410004China

Anthraquinone(AQ),an effective hydrogen atom transfer catalyst,is limited in photocatalytic applications due to its *** this study,a simple 3-(3-(dimethylamino)propyl)-1-ethylcarbodiimide hydrochloride/Nhydroxysuccinimide(EDC/HNS)assisted linking strategy was developed to covalently graft AQ-COOH onto C_(3)N_(4)(CN).Using this method,we successfully synthesized amide-bonded CN-AQ ultrathin *** amide covalent bond formed between C_(3)N_(4) and AQ facilitates efficient electron migration from C_(3)N_(4) to *** a result,charge carrier recombination is prevented and the hydrogen atom transfer capacity of AQ is *** CN-AQ photocatalyst exhibits high activity and selectivity with a toluene conversion rate of 10274(mol g^(-1) h^(-1)) and 85% selectivity for benzaldehyde,which is 31 times and 1.7 times higher than those of pristine C_(3)N_(4) and AQ-COOH,*** to the strong covalent bond in CN-AQ composite,the stability of AQ-COOH was greatly *** approach provides a new pathway to improve catalytic efficiency and solve the dimerization problem of AQ.

关键词： anthraquinone C_(3)N_(4) photocatalysis HAT toluene

来源：评论

学校读者我要写书评

暂无评论

nBn mid-wavelength infrared photodetectors based on bulk InGaAsSb absorbers

引用

Optical Materials Express 2025年第4期15卷 717-723页

作者： Cao, Peng Wei, Jiaqi Bentley, Matthew Davison, Nicholas Hu, Yidan You, Minghui Peng, Hongling Wang, Tiancai Zhuang, Qiandong Zheng, Wanhua Laboratory of Solid State Optoelectronics Information Technology Institute of Semiconductors CAS Beijing100083 China State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors CAS Beijing100083 China College of Electronic and Communication Engineering University of Chinese Academy of Sciences Beijing101408 China Physics Department Lancaster University LancasterLA1 4YB United Kingdom College of Engineering and Technology Jilin Agricultural University 2888 Xincheng Street Changchun130118 China Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou310024 China

In this paper, we demonstrate an nBn mid-wavelength infrared (MWIR) photodetector with a 100% cutoff wavelength over 4.0 µm based on a high-In composition InGaAsSb absorber on GaSb substrate. A thin AlGaAsSb layer is exploited as the barrier layer to suppress the generation-recombination (G-R) current. Both structural and optical properties of the grown InGaAsSb epilayer are investigated by high-resolution X-ray diffraction (HRXRD) and photoluminescence (PL) measurement. Low dark current density down to 9.9 × 10−5 A/cm2 and 6.5 × 10−2 A/cm2 are obtained at −500 mV under 77 K and 300 K, respectively. Moreover, respective peak responsivity of 0.64 A/W and 0.10 A/W at 2.67 µm are achieved at −500 mV under 77 K and 160 K. These correspond to a peak specific detectivity of 1.06 × 1011 cm·Hz1/2/W and 4.23 × 109 cm·Hz1/2/W, respectively. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： III-V semiconductors

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：