检索结果-内蒙古大学图书馆

Theoretical and experimental study of amorphization and lattice transformation of pure magnesium by ultra-precision cutting method

引用

Journal of Magnesium and Alloys 2025年

作者： He, Chunlei Wang, Shuqi Xia, Siyu Ren, Chengzu Tianjin Key Laboratory of Equipment Design and Manufacturing Technology Tianjin University Tianjin300354 China Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System Tianjin University of Technology Tianjin300384 China

Pure magnesium is a very promising material in the fields of biomedical and engineering. Obtaining pure magnesium with superior mechanical properties has consistently been a significant challenge in the area of materials science. This study focuses on investigating the processing method and strengthening mechanism of pure magnesium by ultra-precision cutting. The research results show that the pure magnesium grains were significantly refined after ultra-precision cutting. The average grain size reduced from ∼24 µm to nanometers, and the average nano-hardness increased from 1.02 GPa to 2.82 GPa. Amorphous pure magnesium structure and body-centered cubic (BCC) lattice pure magnesium were reported. Molecular dynamics (MD) simulation confirmed that the high shear strain and hydrostatic pressure during ultra-precision cutting was the origin of amorphization and lattice transformation. The amorphous phase and a significant number of long-period stacking-ordered (LPSO) phases inside the pure magnesium were responsible for the high hardness after ultra-precision cutting. © 2025

关键词： Shear strain

来源：评论

学校读者我要写书评

暂无评论

Interference Fading Suppression for Multi-frequency Φ-OTDR 7

Interference Fading Suppression for Multi-frequency Φ-OTDR

引用

7th Optoelectronics Global Conference, OGC 2022

作者： Wang, Yu Wang, Junhong Liang, Bin Li, Yan Bai, Qing Jin, Baoquan Shanxi Transportation Technology Research & Development Co. Ltd Taiyuan China Taiyuan University of Technology Key Laboratory of Advanced Transducers and Intelligent Control Systems Ministry of Education and Shanxi Province Taiyuan China

ISBN: (纸本)9781665486989

In phase-sensitive optical time domain reflectometer (Φ-OTDR), due to interference fading, the intensity of Rayleigh backward scattering (RBS) signals may be close to zero at the fading position and submerged in noise, resulting in the abnormal demodulated phase of vibration signal. In this paper, a multi-frequency Φ-OTDR is proposed for the interference fading suppression. Three acousto-optical modulators (AOMs) are used to generate multi-frequency probe pulses. Data alignment processing is carried to ensure the consistency of multi-frequency beat signals. Rotated-vector-sum method is adopted to aggregate multi-frequency signals. Experimental results show that with the help of data alignment processing, the fading probability of aligned curve can be reduced to 1.90%, and the SNR of positioning curve can reach 16.03dB. © 2022 IEEE.

关键词： Signal to noise ratio

来源：评论

学校读者我要写书评

暂无评论

Enhanced Fano resonance for high-sensitivity sensing based on bound states in the continuum

引用

Chinese Optics Letters 2023年第3期21卷 54-59页

作者：冯光陈智辉王扬刘欣刘寅山刘啸孙非杨毅彪陈树琪 Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceCollege of Physics and OptoelectronicsTaiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Chemical Biology and Molecular Engineering Ministry of EducationInstitute of BiotechnologyShanxi UniversityTaiyuan 030006China Key Laboratory of Weak Light Nonlinear Photonics Ministry of EducationRenewable Energy Conversion and Storage CenterSchool of Physics and TEDA Institute of Applied PhysicsNankai UniversityTianjin 300071China

Although previously reported terahertz absorbers can achieve high-sensitivity refractive index sensing,the resonant peak is too broad,which leads to a low figure of merit[FOM].Transmissive sensors based on bound states in the continuum[BIC]can achieve high FOM,but they have some limitations in high ***,we propose a periodic triple parallel metal bars structure to obtain high quality,a strong field,and multiple hot spots by the Friedrich-Wintgen *** results show the sensitivity and FOM can reach 1877 GHz/RIU and 665,*** to the previously reported transmissive sensors based on BIC,the sensitivity has been greatly improved.

关键词： Fano resonance bound states in the continuum terahertz high-sensitivity sensing

来源：评论

学校读者我要写书评

暂无评论

Construction and Application of the Teaching Cloud Platform for Engineering Drawing Course 12

Construction and Application of the Teaching Cloud Platform ...

引用

12th IEEE International Conference on Educational and Information Technology, ICEIT 2023

作者： Xue, Yahong Mu, Haozhi Xue, Lijun Tianjin University of Technology Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin300384 China

ISBN: (纸本)9781665475518

A cloud platform for engineering drawing course teaching was proposed based on cloud station. The cloud station can solve the common problems existed in engineering drawing course, such as the difficulty of teaching, the heavy work of tutorship, the poor teaching effect, the weak spatial imagination of students, as well as the current difficulty to develop the virtual model resource base and the interaction is not strong. The platform uses Solidworks software to build 3D model library, and combines with CADbro's powerful cloud service and 3D file viewing function to realize the interaction and sharing with cloud model by using web browser. At the same time, we choose bilibili, a popular cultural site for teenagers, to release the explanation videos of exercises, and make use of the convenient way to build the cloud station to integrate, release and manage the resources. The platform realizes self-study and self-test at anytime and anywhere on both PC and mobile devices, and fast jumps the corresponding explanation video and cloud virtual model according to the demand. The virtual model in the cloud can be rotated, cut, distance measured, exploded, parts hidden, moved, 2D viewed and so on by touch. The platform is innovative, extensible, interesting and practical, which can greatly enhance the students' enthusiasm for independent learning, and it can be used reference to the development of engineering drawing teaching resources. © 2023 IEEE.

关键词： 3D modeling

来源：评论

学校读者我要写书评

暂无评论

controllable four-wave mixing based on quantum dot-cavity coupling system

引用

Communications in Theoretical Physics 2021年第5期73卷 25-32页

作者： Hong-Wu Xing Bin Chen Li-Li Xing Jian-Bin Chen Hai-Bin Xue Kang-Xian Guo Department of Physics College of Physics and OptoelectronicsTaiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceTaiyuan 030024China Department of Physics School of Physics and Materials ScienceGuangzhou UniversityGuangzhou 510006China

We theoretically study the four-wave mixing(FWM)response in a quantum dot-cavity coupling system,where a two-level quantum dot(QD)is placed in an optical cavity while the cavity mode is coupled to the nanomechanical resonator via radiation *** influences of the QD-cavity coupling strength,the Rabi coupling strength of the QD,and the power of the pump light on the FWM intensity are mainly *** numerical results show that the FWM intensity in this hybrid system can be significantly enhanced by increasing the QD-cavity coupling *** addition,the FWM intensity can be effectively modulated by the Rabi coupling strength and the pump ***,the effects of the cavity decay rate and the cavitypump detuning on the FWM signal are also *** obtained results may have potential applications in the fields of quantum optics and quantum information science.

关键词： four-wave mixing quantum dot-cavity coupling system input-output relation

来源：评论

学校读者我要写书评

暂无评论

Enhancing Demodulation Performance of DCM Algorithm inφ-OTDR system Through Temporal Spline Interpolation

引用

Photonic Sensors 2024年第3期14卷 52-63页

作者： Tingyu WANG Jianzhong ZHANG Zhe MA Xiang HE Weizhe LI Binyuan YANG Mingjiang ZHANG Key Laboratory of Advanced Transducers and Intelligent Control Systems(Ministry of Education and Shanxi Province) Taiyuan University of TechnologyTaiyuan 030024China College of Electronic Information and Optical Engineering Taiyuan University of TechnologyTaiyuan 030024China College of Physics Taiyuan University of TechnologyTaiyuan 030024China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030024China

For expanding the amplitude-frequency response range of the differential cross-phase multiply(DCM)algorithm in theφ-OTDR system,a temporal spline interpolation(TSI)method is proposed to pre-process Rayleigh backscattering(RBS)*** the TSI method,the discrete temporal signals characterizing RBS traces are subjected to interpolation,facilitating a reduction in differential approximation ***,in turn,establishes a heightened level of precision in phase demodulation,especially relevant across extensive sensing *** comparing the recovered time-domain waveforms and the corresponding power spectral densities without and with the TSI,the above improvement effect has been experimentally validated by utilizing the *** results show that,with the TSI,the amplitude-frequency response range of the DCM algorithm is enlarged by 2.78 times,and the new relationship among f_(pulse),f,and D under the root mean square error(RMSE)tolerance less than 0.1 can be expressed as 1.9(D+1)f≤f_(pulse).This contribution underscores a substantial advancement in the capabilities of the DCM algorithm,holding promise for refined performance in optical fiber sensing applications.

关键词： φ-OTDR DCM algorithm phase demodulation 3×3 coupler temporal spline interpolation

来源：评论

学校读者我要写书评

暂无评论

Long-range chaotic Brillouin optical correlation domain analysis with more than one million resolving points

引用

advanced Photonics Nexus 2023年第3期2卷 104-113页

作者： Yahui Wang Xinxin Hu Lintao Niu Hui Liu Jianzhong Zhang Mingjiang Zhang Taiyuan University of Technology Ministry of EducationKey Laboratory of Advanced Transducers and Intelligent Control SystemTaiyuanChina Taiyuan University of Technology College of PhysicsTaiyuanChina Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering TaiyuanChina

We propose and experimentally demonstrate a long-range chaotic Brillouin optical correlation domain analysis by employing an optimized time-gated scheme and differential denoising configuration,where the number of effective resolving points largely increases to more than one *** deterioration of the chaotic Brillouin gain spectrum(BGS)and limitation of sensing range owing to the intrinsic noise structure,resulting from the time delay signature(TDS)and nonzero background of chaotic laser,is theoretically *** optimized time-gated scheme with a higher extinction ratio is used to eliminate the TDS-induced *** signal-to-background ratio of the measured BGS is enhanced by the differential denoising scheme to furthest remove the accumulated nonzero noise floor along the fiber,and the pure chaotic BGS is ulteriorly obtained by the Lorentz ***,distributed strain sensing along a 27.54-km fiber with a 2.69-cm spatial resolution is experimentally demonstrated,and the number of effective resolving points is more than 1,020,000.

关键词： chaos distributed fiber sensing stimulated Brillouin scattering long-range sensing

来源：评论

学校读者我要写书评

暂无评论

UWB Non-Line-of-Sight Recognition and Suppression Methodology 15

UWB Non-Line-of-Sight Recognition and Suppression Methodolog...

引用

15th International Conference on Communication Software and Networks, ICCSN 2023

作者： Ni, Zhengshuai Zhou, Haibo Zhang, Guozheng Xu, Wangbei Tianjin University of Technology National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin China School of Mechanical Engineering Tianjin University Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin China

ISBN: (纸本)9798350329360

Ultra-Wide Band (UWB) positioning system has become the main research object in indoor positioning field due to its superior positioning performance. Accuracy at the scale of centimeters is achievable in an ideal positioning scenario. Nonetheless, the intricate and changeable indoor surroundings may cause UWB signals to propagate beyond the line-of-sight (LOS) and weaken in signal strength, resulting in a considerable reduction in the precision of positioning. In this paper, methods for identifying non-line-of-sight (NLOS) errors, alleviating NLOS errors, and integrating multi-sensor information are analyzed and studied to provide reference for improving the NLOS positioning accuracy of UWB. © 2023 IEEE.

关键词： alleviate identify multi-sensor NLOS UWB

来源：评论

学校读者我要写书评

暂无评论

Optical scrambler using WGM micro-bottle cavity

引用

Chinese Optics Letters 2023年第6期21卷 6-10页

作者：常朋发王晨蒋涛王龙生赵彤高华贾志伟郭园园王云才王安帮 Key Laboratory of Advanced Transducers&Intelligent Control Systems Ministry of Education and Shanxi ProvinceCollege of Physics&Optoelectronic EngineeringTaiyuan University of TechnologyTaiyuan 030024China Guangdong Provincial Key Laboratory of Photonics Information Technology School of Information EngineeringGuangdong University of TechnologyGuangzhou 510006China

An optical scrambler using a whispering-gallery-mode[WGM]micro-bottle cavity to scramble a complex optical signal to generate an uncorrelated output is *** experimentally demonstrated this micro-cavity scrambler by using chaotic laser light as the incident signal and studied the influence of the coupling *** achieved full scrambling with a low cross correlation of 0.028 between the output and the *** indicate that the scrambling effect originates from the interference among numerous WGMs in the bottle *** is believed that the micro-bottle cavity with an efficient scrambling function can become a promising candidate for encryption.

关键词： scrambler encryption whispering gallery mode micro-bottle cavity secure communication

来源：评论

学校读者我要写书评

暂无评论

Nonlinear Dynamic Behavior and Vibration Mechanism of a Large Range Rotating Elastic Beam Under Parallel Misalignment Constraints 10

Nonlinear Dynamic Behavior and Vibration Mechanism of a Larg...

引用

10th International Conference on Advances in Machinery, Material Science and Engineering Application, MMSE 2024

作者： Zhao, Lei Xu, Meiye Zhai, Ran Jiao, Likuan Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin300384 China School of Mechanic Engineering Tianjin University of Technology Tianjin300384 China

ISBN: (纸本)9781643685465

Large rotating flexible machines are prone to vibration at high speeds, which is a difficult engineering problem. In this study, we have deeply explored its nonlinear dynamic behavior and vibration mechanism, especially considering the effect of parallel misalignment. Through mathematical modeling and MATLAB simulations, we found that the rotational speed and the amount of misalignment are the key parameters affecting the stability of the system. The results show that the rotational speed and parallel misalignment are the sensitive parameters of the system. When the amount of misalignment is 0.002 mm, with the increase of rotational speed, the elastic beam exhibits nonlinear M-type vibration, doubly periodic and chaotic behaviors, which show high-frequency abrupt excitation;when the angular speed is 50 rad/s, with the increase of the amount of misalignment from 0.001 mm to 0.1 mm, the system exhibits the transformation of doubly periodic, chaotic and proposed periodic motions, and the characteristics of intermittent vibration are significant. These results provide an important theoretical basis for suppressing its nonlinear vibration. © 2024 The Authors.

关键词： Rotating machinery

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：