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Geometric error measuring,modeling,and compensation for CNC machine tools:A review

Chinese Journal of Aeronautics 2024年第2期37卷 163-198页

作者： Zhao ZHANG Feng JIANG Ming LUO Baohai WU Dinghua ZHANG Kai TANG Engineering Research Center of Advanced Manufacturing Technology for Aero Engine(Northwestern Polytechnical University) Ministry of EducationXi’an 710072China Key Laboratory of High Performance Manufacturing for Aero Engine(Northwestern Polytechnical University) Ministry of Industry and Information TechnologyXi’an 710072China Department of Mechanical and Aerospace Engineering Hong Kong University of Science and TechnologyHong KongChina

Geometric error,mainly due to imperfect geometry and dimensions of machine components,is one of the major error sources of machine *** that geometric error has significant effects on the machining quality of manufactured parts,it has been a popular topic for academic and industrial research for many years.A great deal of research work has been carried out since the 1970s for solving the problem and improving the machining *** have studied how to measure,detect,model,identify,reduce,and compensate the geometric *** paper presents a thorough review of the latest research activities and gives an overview of the state of the art in understanding changes in machine tool performance due to geometric *** advances in measuring the geometrical errors of machine tools are summarized,and different kinds of error identification methods of translational axes and rotation axes are illustrated ***,volumetric geometric error modeling,tracing,and compensation techniques for five-axis machine tools are emphatically ***,research challenges in order to improve the volumetric accuracy of machine tools are also highlighted.

关键词： Error compensation Error identification Error measurement Error modeling Geometric error Machine tools

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Study of the geomagnetic field's regional gradients in Chinese continent using three-dimensional surface Spline model

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Earth and Planetary Physics 2023年第1期7卷 74-83页

作者： Yan Feng YiJun Li JinYan Zhang Shuang Liu Abbas Nasir Ya Huang Institute of Space Weather Nanjing University of Information Science&TechnologyNanjing 210044China State Key Laboratory of Space Weather Chinese Academy of SciencesBeijing 100190China State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacao 999078China School of Electronic and Optical Engineering Nanjing University of Science and TechnologyNanjing 210094China

We combined domestic ground-based and satellite magnetic measurements to create a regional three-dimensional surface Spline(3DSS)gradient model of the main geomagnetic field over the Chinese *** improve the precision of the model,we considered the data gap between the ground and satellite *** compared and analyzed the results of the Taylor polynomial,surface Spline,and CHAOS-6(the CHAMP,?rsted and SAC-C model of Earth’s magnetic field)gradient *** showed that the gradients in the south-north and east-west directions of the four models were *** 3DSS model was able to express not only gradients at different altitudes,but also average gradients inside the research *** two Spline models were able to capture more information on gradient anomalies than were the fitted *** local anomalies were observed in northern Xinjiang,Beijing,and the junction area between Jiangsu and Zhejiang,and the total intensity F decreased whereas the altitude *** gradient decreased by 21.69%in the south-north direction and increased by 11.78%in the east-west *** addition,the altitude gradient turned from negative to positive while the altitude *** Spline model and the two fitted models differed mainly in the field sources they expressed and the modeling theory.

关键词： geomagnetic field main field gradients regional model three-dimensional modeling

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Polarization-directed nanophotonic routers based on twodimensional inorganic molecular crystals

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InfoMat 2024年第8期6卷 111-118页

作者： Jiacheng Yao Xin Feng Tingting Zhang Fangqi Chen Zhenglong Zhang Hairong Zheng Tianyou Zhai Tao Ding Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education School of Physics and TechnologyWuhan UniversityWuhanthe People's Republic of China State Key Laboratory of Materials Processing and Die&Mould Technology and School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanthe People's Republic of China Department of Mechanical Engineering The University of Texas at DallasRichardsonTexasUSA School of Physics and Information Technology Shaanxi Normal UniversityXi'anthe People's Republic of China

Photonic and plasmonic hybrid nanostructures are the key solution for integratednanophotonic circuits with ultracompact size but relative low loss. However,the poor tunability and modulability of conventional waveguides makesthem cumbersome for optical multiplexing. Here we make use of twodimensionalmolecular crystal, α-Sb_(2)O_(3) as a dielectric waveguide via totalinternal reflection, which shows polarization-sensitive modulation of the propagatingbeams due to its large polarization mode dispersion. Both experimentsand simulations are performed to verify such concept. These Sb_(2)O_(3) nanoflakescan be coupled with plasmonic nanowires to form nanophotonic beam splittersand routers which can be easily modulated by changing the polarization of theincidence. It thus provides a robust, exploitable and tunable platform for onchipnanophotonics.

关键词： nanoflakes plasmonics polarization Sb_(2)O_(3) waveguides

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Five-level anti-counterfeiting based on versatile luminescence of tri-doped double perovskites

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Nano Research 2024年第11期17卷 9971-9979页

作者： Xingru Yang Yuhang Sheng Linglong Zhang Lun Yang Fangjian Xing Yunsong Di Cihui Liu Fengrui Hu Xifeng Yang Guofeng Yang Yushen Liu Zhixing Gan Center for Future Optoelectronic Functional Materials School of Computer and Electronic Information/School of Artificial Intelligence Nanjing Normal University Nanjing 210023 China College of Physics Nanjing University of Aeronautics and Astronautics Key Laboratory of Aerospace Information Materials and Physics (NUAA) MIIT Nanjing 211106 China Hubei Key Laboratory of Photoelectric Materials and Devices School of Materials Science and Engineering Hubei Normal University Huangshi 435002 China College of Engineering and Applied Sciences and MOE Key Laboratory of Intelligent Optical Sensing and Manipulation Nanjing University Nanjing 210093 China College of Electronic and Information Engineering Changshu Institute of Technology Suzhou 215500 China School of Science Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology Jiangnan University Wuxi 214122 China Yancheng Polytechnic College Yancheng 224005 China

Luminescent materials with multi-emission features are difficult to be replicated, which are highly desirable for advanced anti-counterfeiting. Here, we report the pioneering synthesis of Mn^(2+)/Yb^(3+)/Er^(3+) tri-doped Cs2Ag0.8Na0.2InCl6 double perovskites (MYE-DP), which exhibit photoluminescence (PL) covering from visible to near-infrared (NIR). The PL colors under excitations of 254 and 365 nm are notably different due to the changed relative emission intensities of self-trapped excitons (STEs) and Mn^(2+) d–d transition. Moreover, under the excitation of a NIR laser, the MYE-DP exhibits upconversion (UC) emissions of Mn^(2+) and Er^(3+). After ceasing the excitation, the long-lived trapped electrons can be thermally released to Mn^(2+) and Er^(3+) ions, resulting in both visible and NIR afterglow. Based on multi-modal emissions of the MYE-DP, we demonstrate a five-level anti-counterfeiting strategy, which significantly increases the anti-counterfeiting security. In addition, this work provides valuable insights into the energy transfer between STEs, Mn^(2+), Ln^(3+), and traps, laying a solid foundation for future development of new lead-free perovskites.

关键词： anti-counterfeiting photoluminescence self-trapped excitons upconversion

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Stability analysis of magnetization in a perpendicular magnetic layer driven by spin Hall effect

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Chinese Physics B 2023年第5期32卷 662-667页

作者：李再东赵欣欣徐天赋 Tianjin Key Laboratory of Quantum Optics and Intelligent Photonics School of ScienceTianjin University of TechnologyTianjin 300384China Department of Applied Physics and School of Information Engineering Hebei University of TechnologyTianjin 300401China College of Science Yanshan UniversityQinhuangdao 066004China

We investigate the stability of magnetization in free layer where the spin torque is induced by the spin Hall *** terms of the Landau–Liftshitz–Gilbert equation,we find the low-energy and high-energy equilibrium states,as well as the saddle *** stability region is defined in the phase diagram spanned by the current density and the spin Hall *** spin Hall effect makes the previous saddle point into a stable state above a critical ***,in the presence of magnetic field,the spin Hall effect leads to the opposite changes in the stable regions of the two low-energy states.

关键词： stability spin Hall effect equilibrium states

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Dual Interfacial Design Enables Efficient and Stable Semitransparent Wide-Bandgap Perovskite Solar Cells With Scalable-Coated Silver Nanowire Contact for Tandem Applications

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SusMat 2025年第1期5卷 151-158页

作者： Chaoran Chen Lianglan Liu Ting Huang Biao Tu Hongbing Li Qingchen He Qiaoyan Ma Zhenhua Xu Shi Chen Jianmin Li Guangxing Liang Yaohua Mai Fei Guo Institute of New Energy Technology College of Information Science and TechnologyJinan UniversityGuangzhouChina Key Laboratory of Renewable Energy Chinese Academy of SciencesGuangzhouChina CNBM(Chengdu)Optoelectronic Materials Co. Ltd.ChengduChina School of Materials Science and Engineering Ningbo Tech UniversityNingboChina Henan Key Laboratory of Photovoltaic Materials School of Future TechnologyHenan UniversityZhengzhouChina Key Laboratory of Artificial Micro-and Nano-Structures of Ministry of Education and School of Physics and TechnologyWuhan UniversityWuhanChina Shenzhen Key Laboratory of Advanced Thin Films and Applications Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhenGuangdongChina Guangdong Mellow Energy Co. Ltd.GuangzhouChina

Semitransparent perovskite solar cells(PSCs)hold great potential for applications in aesthetic building facades and top-illuminated tandem *** tin oxide is currently the frequently used top transparent contact,which would degrade the underlying perovskites during sputter ***,we report low-temperature,scalable solution-processed silver nanowires(AgNWs)as top window electrodes for fabricating efficient and stable semitransparent *** a decisive step,an impermeable SnO_(2) thin film deposited by atomic layer deposition(ALD)is applied to prevent chemical reactions between AgNWs and halides of *** parallel,the molecular absorption of propylenediamine iodine(PDADI)on perovskite surface,instead of forming two-dimensional(2D)perovskite capping layer,is found to effectively passivate the perovskite surface,which simultaneously leads to remarkably enhanced thermal stability,thus affording the processing window for ALD-SnO_(2) ***,the prepared semitransparent PSCs with a bandgap of 1.71 eV achieve a champion efficiency of 17.5%,being the highest efficiency for semitransparent PSCs with AgNWs top *** these bases,we constructed a four-terminal perovskite/copper indium gallium diselenide(CIGS)tandem cell,giving a state-of-the-art efficiency of 26.85%.

关键词： perovskite/GIGS semitransparent silver nanowires tandem photovoltaics

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Optical pulse processor based on achromatic time lens assisted by compound phase modulation

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Optics Express 2025年第10期33卷 20754-20766页

作者： Liu, Huabei Xie, Qijie Ma, Chunyang Na, Quanxin Wang, Chaopeng Zuo, Guomeng Shi, Xiaobin Du, Jiangbing Wang, Lei Shao, Liyang Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen518055 China Peng Cheng Laboratory Shenzhen518055 China State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China

The time-lens based optical pulse processors have been widely applied in ultrafast optical processing and quantum optics. Conventionally, the time-lens systems used to adopt a sinusoidal waveform to approximate quadratic temporal phase modulation. It inevitably restricts the duration of a linear chirp, and thus limiting the temporal aperture to realize perfect Fourier transform. In this paper, we propose what we believe to be a novel achromatic time lens to expand the temporal aperture by using compound phase modulation. The achromatic time lens first compresses an optical pulse via a traditional time lens, and then introduces a linear chirp over the pulse duration by applying compound waveform consisted of the weighted fundamental and second harmonics. Numerical results proved that the synthesized linear chirp can be maintained over the pulse duration, when the duty cycle of the incident pulse increased from 15% to 72%. It indicates the effective temporal aperture to be expanded significantly. Experimentally, we have applied the achromatic time lens system to process a Gaussian pulse without distorting the pulse shape. The pulse width is compressed from 34 ps to 2.2 ps, while the spectral bandwidth is broadened from 0.32 nm to 1.6 nm. Both the temporal waveform and spectral envelope are maintained. The achromatic time lens scheme exhibits potential integration for supporting on-chip pulse processing with large time aperture. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Quantum optics

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Pedestrian wind flow prediction using spatial-frequency generative adversarial network

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Building Simulation 2024年第2期17卷 319-334页

作者： Pengyue Wang Maozu Guo Yingeng Cao Shimeng Hao Xiaoping Zhou Lingling Zhao School of Architecture and Urban Planning Beijing University of Civil Engineering and ArchitectureBeijing100044China Beijing Key Laboratory of Intelligent Processing for Building Big Data Beijing100044China School of Electrical and Information Engineering Beijing University of Civil Engineering and ArchitectureBeijing100044China School of Computer Science and Technology Harbin Institute of TechnologyHarbin150001China

Pedestrian wind flow is a critical factor in designing livable residential environments under growing complex urban *** pedestrian wind flow during the early design stages is essential but currently suffers from inefficiencies in numerical *** learning,particularly generative adversarial networks(GAN),has been increasingly adopted as an alternative method to provide efficient prediction of pedestrian wind ***,existing GAN-based wind flow prediction schemes have limitations due to the lack of considering the spatial and frequency characteristics of wind flow *** study proposes a novel approach termed SFGAN,which embeds spatial and frequency characteristics to enhance pedestrian wind flow *** the spatial domain,Gaussian blur is employed to decompose wind flow into components containing wind speed and distinguished flow edges,which are used as the embedded spatial *** information of wind flow is obtained through discrete wavelet transformation and used as the embedded frequency *** spatial and frequency characteristics of wind flow are jointly utilized to enforce consistency between the predicted wind flow and ground truth during the training phase,thereby leading to enhanced *** results demonstrate that SFGAN clearly improves wind flow prediction,reducing Wind_MAE,Wind_RMSE and the Fréchet Inception Distance(FID)score by 5.35%,6.52%and 12.30%,compared to the previous best method,*** also analyze the effectiveness of incorporating the spatial and frequency characteristics of wind flow in predicting pedestrian wind *** reduces errors in predicting wind flow at large error intervals and performs well in wake regions and regions surrounding *** enhanced predictions provide a better understanding of performance variability,bringing insights at the early design stage to improve pedestrian wind *** proposed spatial-frequen

关键词： pedestrian wind flow prediction generative adversarial network Gaussian kernel wavelet transform objective function

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In-plane spin excitation of skyrmion bags

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Chinese Physics B 2023年第11期32卷 585-590页

作者：李爽李可欣刘照华朱起源赵晨博张虎石兴强王江龙王瑞宁连如乾巩朋来金晨东 Key Laboratory of Optic-Electronic Information and Materials of Hebei Province Research Center for Computational PhysicsCollege of Physics Science and TechnologyHebei UniversityBaoding 071002China College of Mathematics and Physics Chongqing University of Science and TechnologyChongqing 401331China Department of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China

Skyrmion bags are spin structures with arbitrary topological charges, each of which is composed of a big skyrmion and several small skyrmions. In this work, by using an in-plane alternating current(AC) magnetic field, we investigate the spinwave modes of skyrmion bags, which behave differently from the clockwise(CW) rotation mode and the counterclockwise(CCW) rotation mode of skyrmions because of their complex spin topological structures. The in-plane excitation power spectral density shows that each skyrmion bag possesses four resonance frequencies. By further studying the spin dynamics of a skyrmion bag at each resonance frequency, the four spin-wave modes, i.e., a CCW-CW mode, two CW-breathing modes with different resonance strengths, and an inner CCW mode, appear as a composition mode of outer skyrmion–inner skyrmions. Our results are helpful in understanding the in-plane spin excitation of skyrmion bags, which may contribute to the characterization and detection of skyrmion bags, as well as the applications in logic devices.

关键词： skyrmion bags spin-wave mode power spectral density micromagnetic simulation

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Improvement of hydrogen permeation barrier performance by iron sulphide surface films

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International Journal of Minerals,Metallurgy and Materials 2023年第9期30卷 1792-1800页

作者： Pengpeng Bai Shaowei Li Jie Cheng Xiangli Wen Shuqi Zheng Changfeng Chen Yu Tian State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China School of Mechanical Electronic&Information Engineering China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China

Fe–S compounds with hexagonal crystal structure are potential hydrogen permeation barrier during H2S corrosion. Hexagonal system Fe–S films were prepared on carbon steel through corrosion and CVD deposition, and the barrier effect of different Fe–S films on hydrogen permeation was tested using electrochemical hydrogen permeation method. After that, the electrical properties of Fe–S compound during phase transformation were measured using thermoelectric measurement system. Results show that the mackinawite has no obvious barrier effect on hydrogen penetration, as a p-type semiconductor, and pyrrhotite (including troilite) has obvious barrier effect on hydrogen penetration,as an n-type semiconductor. Hydrogen permeation tests showed peak permeation performance when the surface was deposited with a continuous film of pyrrhotite (Fe_(1–x)S) and troilite. The FeS compounds suppressed hydrogen permeation by the promotion of the hydrogen evolution reaction, semiconducting inversion from p-to n-type, and the migration of ions at the interface.

关键词： hydrogen permeation barrier iron sulfide pyrrhotite semiconductor

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