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Recent Advances in Electrochemical-Based Silicon Production Technologies with Reduced Carbon Emission

Research 2024年第1期2023卷 209-236页

作者： Feng Tian Zhongya Pang Shen Hu Xueqiang Zhang Fei Wang Wei Nie Xuewen Xia Guangshi Li Hsien-Yi Hsu Qian Xu Xingli Zou Li Ji Xionggang Lu State Key Laboratory of Advanced Special Steel&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and Engineering Shanghai University99#Shangda RoadShanghai 200444China Center for Hydrogen Metallurgy Technology Shanghai UniversityShanghai 200444China State Key Laboratory of ASIC and System School of MicroelectronicsFudan University220#Handan RoadShanghai 200433China School of Energy and Environment Department of Materials Science and EngineeringCity University of Hong KongKowloon TongHong KongChina

Sustainable and low-carbon-emission silicon production is currently one of the main focuses for the metallurgical and materials science ***,considered a promising strategy,has been explored to produce silicon due to prominent advantages:(a)high electricity utilization efficiency;(b)low-cost silica as a raw material;and(c)tunable morphologies and structures,including films,nanowires,and *** review begins with a summary of early research on the extraction of silicon by *** has been placed on the electro-deoxidation and dissolution–electrodeposition of silica in chloride molten salts since the 21st century,including the basic reaction mechanisms,the fabrication of photoactive Si films for solar cells,the design and production of nanoSi and various silicon components for energy conversion,as well as storage ***,the feasibility of silicon electrodeposition in room-temperature ionic liquids and its unique opportunities are *** this basis,the challenges and future research directions for silicon electrochemical production strategies are proposed and discussed,which are essential to achieve large-scale sustainable production of silicon by electrochemistry.

关键词： directions electrodeposition electricity

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Research on Multi-sensor Fusion Localization of Wheel-Legged robots in Dynamic Scenarios 7

Research on Multi-sensor Fusion Localization of Wheel-Legged...

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7th International Conference on Automation, Control and robots, ICACR 2023

作者： Li, Xu Fu, Yili Cheng, Zuolun Harbin Institute of Technology State Key Laboratory of Robotics and System Harbin150001 China Zhejiang Laboratory Intelligent Robot Research Center Hangzhou311100 China

ISBN: (纸本)9798350302882

With the rapid development of human beings in motion control and localization perception, intelligent mobile robots are widely used in various scenarios, such as industrial production, medical care, logistics and distribution. Among them, wheel-legged robots have both the high mobility of wheeled robots and the high adaptability of legged robots, which can not only move fast on platform terrain, but also adapt to rugged and complex ground with the multiple degrees of freedom of their legs. Wheel-legged robots face the following main problems in high-precision robust localization in multiple scenarios: there are a lot of dynamic factors in daily indoor and outdoor scenarios, such as vehicles, pedestrians, etc., which require specific processing of dynamic environment in the visual front-end part to improve the effect of visual factor constraints;as ground mobile robots, the localization framework of visual inertial fusion (VIO) will show scale degeneration phenomenon, resulting in long-distance localization accuracy decline. In addition, as a two wheeled inverted pendulum robot, the ground constraint form will undergo corresponding changes. Aiming at the above problems, this paper takes the hydraulic-driven wheel-legged robot as the object and proposes a multi-sensor fusion localization method in dynamic scenarios. © 2023 IEEE.

关键词： Degrees of freedom (mechanics)

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Dual-Wavelength Bad Cavity Laser as Potential Active Optical Frequency Standard

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Chinese Physics Letters 2015年第9期32卷 31-34页

作者：许志超潘多庄伟陈景标 State Key Laboratory of Advanced Optical Communication System and Network Institute of Quantum Electronics School of Electronics Engineering & Computer Science Peking University Beijing 100871 National Institute of Metrology Beijing 100013

We experimentally realize the dual-wavelength bad cavity laser for the first time. As the Cs cell temperature is kept between 118℃ and 144℃, both the 1359nm and 147Ohm lasing outputs of dual-wavelength bad cavity laser are detected. The laser output power of dual-wavelength bad cavity laser is measured when changing the 455 nm pumping laser frequency and power at 127℃ Cs cell temperature. Both the 1359 nm laser and the 1470 nm laser are working at the deep bad cavity regime, and the ratio between the linewidth of cavity mode and the laser gain bandwidth a ≈ 40 for 1359nm and 1470nm lasers. The 147Ohm laser linewidth is measured to be 407.3Hz. The dual-wavelength bad cavity laser operating on atomic transitions demonstrated here has a potential in the application as a stable optical local oscillator, even an active optical frequency standard directly in the future.

关键词： Dual-Wavelength Bad Cavity Laser as Potential Active Optical Frequency Standard As Cs length

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Subsynchronous Control Interaction: Real-World Events and Practical Impedance Reshaping Controls 10

Subsynchronous Control Interaction: Real-World Events and Pr...

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10th Renewable Power Generation Conference, RPG 2021

作者： Xie, Xiaorong Liu, Wei Shair, Jan Dai, Chaobo Liu, Xiaoge State Key Laboratory of Advanced Power Transmission Technology Beijing102209 China State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing100084 China

ISBN: (纸本)9781839536069

The power electronic converters have enabled the harnessing of electrical energy from renewable resources, such as wind and solar. However, the power electronic converter-based devices can interact with other grid components and lead to unstable oscillation in a wide frequency range, for instance, the subsynchronous and high-frequency oscillations. In the past decade, several subsynchronous control interaction (SSCI) events have been reported, for instance, in the Xcel Energy, ERCOT, Guyuan, and Hami wind power systems. This chapter first provides a brief overview of the occurrence mechanisms and features of various real-world SSCI events. Then, it discusses the practical impedance reshaping mitigation control schemes. The practical installation experience of both generator-side and grid-side impedance reshaping control techniques is provided, which enhances the confidence to practically implement these schemes in the actual power systems that are facing similar challenges. Finally, recommended guidelines and research prospects in the analysis and mitigation are provided. © The Institution of Engineering and Technology.

关键词： Power converters

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Cracking cause analysis of a baffle of the inlet guide vane in an aeroengine

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Engineering Failure Analysis 2025年

作者： Jun Zhang Teng Fang Weidong Liu Jiulin Xiao Juan Wang Jinfang Peng Jianhua Liu Minhao Zhu Tribology Research Institute State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong University Chengdu 610031 China Technology Center AECC Chengdu Engine Co. LTD. Chengdu 610503 China State-owned Chuanxi Machine Factory Chendu 611930 China Key Laboratory of Advanced Technologies of Materials of Ministry of Education Southwest Jiaotong University Chengdu 610031 China

Riveting technology is extensively employed in thin-walled structural connections of aircraft. However, the clamped areas of the riveted connections are susceptible to fretting damage under alternating load. This paper focuses on the baffle cracking problem of an inlet guide vane in an aero-engine during the bench test. The failure mechanisms and root causes of the cracks were comprehensively investigated through stereomicroscopy, fractographic analyses, metallographic examination, chemical composition analysis, mechanical testing, and finite element simulations. The results show that the baffle conforms to TA21 titanium alloy specifications. Fretting fatigue in the clamped area at the rivet-hole interface was identified as the primary cause of the baffle’s premature cracking. Meanwhile, finite element analyses further reveal that cracks originating within the clamped areas of the baffle correlate with localized von-Mises stress concentrations induced by the riveting process and exacerbated by the first-order bending vibration of the inlet guide vane.

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Microresonator-referenced soliton microcombs with zeptosecond-level timing noise

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Nature Photonics 2025年 1-7页

作者： Jin, Xing Xie, Zhenyu Zhang, Xiangpeng Hou, Hanfei Wu, Bingyan Zhang, Fangxing Zhang, Xuanyi Chang, Lin Gong, Qihuang Yang, Qi-Fan State Key Laboratory for Artificial Microstructure and Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of Physics Peking University Beijing China State Key Laboratory of Advanced Optical Communications System and Networks School of Electronics Peking University Beijing China Peking University Yangtze Delta Institute of Optoelectronics Nantong China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan China

Optical frequency division relies on optical frequency combs to translate ultrastable optical frequency references coherently to the microwave domain. This technology has enabled the synthesis of microwave signals with ultralow timing noise;however, the necessary instrumentation remains too bulky for practical applications. Recently, efforts have focused on leveraging microphotonic technologies to enhance system compactness. Here we develop an optical frequency division system using microresonator-based frequency references and comb generators. The soliton microcomb formed in an integrated Si3N4 microresonator is stabilized to two lasers referenced to an ultrahigh-quality-factor MgF2 microresonator. Photodetection of the soliton pulse train produces 25-GHz microwaves with an absolute phase noise of –141 dBc Hz–1 (546 zs Hz−1/2) at a 10-kHz offset frequency, which can be further referenced to an atomic clock for improved long-term stability. The synthesized microwave signals are evaluated as carrier waves in communication and radar applications, demonstrating enhanced fidelity and sensitivity against interference compared with those derived from electronic oscillators. Our work demonstrates unprecedented coherence in microphotonic microwave oscillators, providing key building blocks for next-generation timekeeping, navigation and satellite communication systems. © The Author(s), under exclusive licence to Springer Nature Limited 2025.

关键词： Microwave oscillators

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IP over optical multicasting for large-scale video delivery

IP over optical multicasting for large-scale video delivery

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Network Architectures, Management, and Applications V

作者： Jin, Yaohui Hu, Weisheng Sun, Weiqiang Guo, Wei State Key Laboratory on Advanced Optical Communication System and Network Shanghai Jiao Tong University Shanghai 200240 China

ISBN: (纸本)9780819469472

In the IPTV systems, multicasting will play a crucial role in the delivery of high-quality video services, which can significantly improve bandwidth efficiency. However, the scalability and the signal quality of current IPTV can barely compete with the existing broadcast digital TV systems since it is difficult to implement large-scale multicasting with end-to-end guaranteed quality of service (QoS) in packet-switched IP network. China 3TNet project aimed to build a high performance broadband trial network to support large-scale concurrent streaming media and interactive multimedia services. The innovative idea of 3TNet is that an automatic switched optical networks (ASON) with the capability of dynamic point-to-multipoint (P2MP) connections replaces the conventional IP multicasting network in the transport core, while the edge remains an IP multicasting network. In this paper, we will introduce the network architecture and discuss challenges in such IP over Optical multicasting for video delivery.

关键词： Multicasting

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Optically Pumped Cesium Beam Clock Using Monochromatic Light

Optically Pumped Cesium Beam Clock Using Monochromatic Light

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2023 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium, EFTF/IFCS 2023

作者： Liu, Chen Li, Yuanhao Chen, Sifei Fan, Lifeng Wang, Yanhui School of Electronics State Key Laboratory of Advanced Optical Communication System and Network Peking University Beijing100871 China

We propose a new method about optically pumped cesium beam clock. Due to the magnetic field of selecting magnet, the pumping light and detection light use the same frequency laser which makes system structure simpler.... 详细信息

ISBN: (纸本)9798350311426

关键词： Atomic clock Cesium beam Frequency standard Optical pumping

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Improved interfacial bonding strength of laser TC4/UHMWPE joints via a hybrid surface pretreatment

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Applied Surface Science 2025年

作者： Zhaoyang Chen Jin Yang Yinjiao He Ruijun Wang Yulong Li Ruijie Hao Yixuan Zhao Caiwang Tan Xiaoguo Song Jianguang Zhai School of Materials Science and Engineering Shanghai University of Engineering Science Shanghai 201620 China School of Intelligent Manufacturing Shanghai Zhongqiao Vocational and Technical University Shanghai 201514 China Key Lab for Robot & Welding Automation of Jiangxi Province School of Advanced Manufacturing Nanchang University Nanchang 330031 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 China

Titanium alloys and ultra-high molecular weight polyethylene (UHMWPE) are extensively utilized in biomedical implants due to their biocompatibility. As a kind of non-polar polymer, UHMWPE exhibits low surface activity and hydrophobicity, hindering a strong bonding to titanium alloys. This study introduced a novel hybrid modification method aimed at improving the reliability of artificial joint prostheses with a hybrid structure of Ti-6Al-4 V titanium alloy (TC4) and UHMWPE. Firstly, the introduction of polar groups on the UHMWPE surface using an ultraviolet (UV) lamp/ozone. Secondly the textured grids were processed on the TC4 surface using laser processing. The two materials were laser joined via heat transfer mode with a TC4-on-UHMWPE configuration. The bonding interface and fracture were characterized and analyzed by scanning electron microscopy (SEM), energy spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD), which indicated the formation of mechanical interlocking and the generation of new chemical bonds at the interface. The bonding mechanism at the joint interface was also confirmed by density functional theory (DFT) calculations. The bidirectionally modified TC4-UHMWPE hybrid structure obtained a maximum tensile shear of 1233 N, realizing joint strength matching. This provides a new solution for the joining of non-polar polymers to metals. It is also essential for the development of more durable and reliable biomedical implants and prostheses.

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Beyond 100Gb/s Nyquist 128/256/512-QAM subcarrier modulation direct detection transmission using O-band DML with digital nonlinearity mitigation 26

Beyond 100Gb/s Nyquist 128/256/512-QAM subcarrier modulation...

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26th Optoelectronics and Communications Conference, OECC 2021

作者： Zhu, Yixiao Guo, Zidong Wu, Qi Hu, Weisheng State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai200240 China

We experimentally demonstrate high-order QAM SCM signals 20km transmission with O-band DML and digital nonlinearity mitigation. 147Gb/s, 136Gb/s, and 108Gb/s line rates are achieved with 128/256/512-QAM formats below ... 详细信息

ISBN: (纸本)9781557528209

关键词： Optical fibers

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