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红外飞秒光纤激光焊接石英玻璃与304不锈钢

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中国激光 2024年第16期51卷 31-39页

作者：袁锦辉霍靖宇张博元王磊郑重李嘉铭郭亮罗爱平张庆茂华南师范大学信息光电子科技学院广东省微纳光子功能材料与器件重点实验室广东广州510006 深圳市中基自动化股份有限公司广东深圳518105 深圳市青锐科技有限公司广东深圳518000 广东省工业超短脉冲激光技术企业重点实验室广东深圳518055 华南师范大学广州市特种光纤光子器件与应用重点实验室广东广州510006

研究探索金属与玻璃异种材料的连接技术是推动其大规模应用的关键,其中,对热膨胀系数相差大的玻璃与金属进行连接的超短脉冲激光焊接技术,对于提升精密微型器件的制造水平和应用具有重要意义。笔者利用有限元模型分析了石英玻璃与304不... 详细信息

研究探索金属与玻璃异种材料的连接技术是推动其大规模应用的关键,其中,对热膨胀系数相差大的玻璃与金属进行连接的超短脉冲激光焊接技术,对于提升精密微型器件的制造水平和应用具有重要意义。笔者利用有限元模型分析了石英玻璃与304不锈钢飞秒激光焊接过程的温度场,验证了所用激光焊接工艺参数的焊接可行性。为优化飞秒脉冲激光焊接工艺参数,研究了飞秒激光焊接单脉冲能量对焊接质量的影响规律。结果表明:激光单脉冲能量对热效应有显著影响;热应力因热效应的增强而增大,当其超过石英玻璃的损伤阈值后会导致微裂纹产生,进而导致焊接样品的焊接强度降低;最佳工艺参数是激光单脉冲能量5.6μJ,重复频率500 kHz,扫描速度60 mm/s,此工艺参数下焊接样品的剪切强度最大,可达到13 MPa。对两种材料的焊接机理进行了研究,结果表明:激光焊接石英玻璃与304不锈钢实现了冶金结合;Fe、Cr在界面与SiO2可能发生了氧化还原反应,形成了Fe2O3和Cr2O3。

关键词：激光技术飞秒激光焊接异种材料焊接焊缝形貌焊接强度焊接机理

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多芯光纤光栅形状重构中的扭转校准技术研究

光纤与电缆及其应用技术 2024年第1期 16-21,31页

作者：黄泽超张俊高侃罗爱平华南师范大学信息光电子科技学院广州510631 中国电子科技集团公司第二十三研究所上海201900

由于多芯光纤光栅制备工艺中的几何缺陷以及封装位置摆放不正确,可能导致不同离散测量点的光纤截面中的纤芯之间产生相对角度偏移,进而产生光纤截面扭转问题。随着三维形状重构距离的增加,该扭转问题会带来形状重构坐标的误差累积,并最... 详细信息

由于多芯光纤光栅制备工艺中的几何缺陷以及封装位置摆放不正确,可能导致不同离散测量点的光纤截面中的纤芯之间产生相对角度偏移,进而产生光纤截面扭转问题。随着三维形状重构距离的增加,该扭转问题会带来形状重构坐标的误差累积,并最终影响三维形状重构的准确性。为此,设计并搭建了相应的形状重构扭转校准实验,以解决该固有扭转问题。实验结果表明,该扭转校准方法拓展了三维形状重构模型的适用范围,提高了重构结果的准确性。

关键词：多芯光纤光栅 Frenet标架曲线重构扭转角度校准

Railway Passenger Flow Forecasting by Integrating Passenger Flow Relationship and Spatiotemporal Similarity

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Intelligent Automation & Soft Computing 2023年第8期37卷 1877-1893页

作者： Song Yu aiping luo Xiang Wang Central South University Chang Sha410083China

Railway passenger flow forecasting can help to develop sensible railway schedules,make full use of railway resources,and meet the travel demand of *** structure of passenger flow in railway networks and the spatiotemporal relationship of passenger flow among stations are two distinctive features of railway passenger *** of the previous studies used only a single feature for prediction and lacked correlations,resulting in suboptimal *** address the above-mentioned problem,we proposed the railway passenger flow prediction model called Flow-Similarity Attention Graph Convolutional Network(F-SAGCN).First,we constructed the passenger flow relations graph(RG)based on the Origin-Destination(OD).Second,the Passenger Flow Fluctuation Similarity(PFFS)algorithm is used to measure the similarity of passenger flow between stations,which helps construct the spatiotemporal similarity graph(SG).Then,we determine the weights of the mutual influence of different stations at different times through an attention mechanism and extract spatiotemporal features through graph convolution on the RG and ***,we fused the spatiotemporal features and the original temporal features of stations for *** comparison experiments on a railway bureau’s accurate railway passenger flow data show that the proposed F-SAGCN method improved the prediction accuracy and reduced the mean absolute percentage error(MAPE)of 46 stations to 7.93%.

关键词： Railway passenger flow forecast graph convolution neural network passenger flow relationship passenger flow similarity

Coexistence of bound soliton and harmonic mode-locking soliton in an ultrafast fiber laser based on MoS2-deposited microfiber photonic device

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Chinese Optics Letters 2018年第2期16卷 64-68页

作者： Meng Liu aiping luo Wencheng Xu and Zhichao luo Cuangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices&Guangzhou Key Laboratory for Special Fiber Photonic Devices and Applications South China Normal UniversityCuangzhou 510006China Guangdong Provincial Engineering Technology Research Center for Microstructured Functional Fibers and Devices South Chin~Normal UniversityGuangzhou 510006China

As the typical material of two-dimensional transition metal dichalcogenides（TMDs）, few-layered MoS2 possesses broadband saturable absorption and a large nonlinear refractive index, which could be regarded as a promising candidate for dual-function photonic device fabrication. In this work, the coexistence of a bound soliton and harmonic mode-locking soliton was demonstrated in an ultrafast fiber laser based on a MoS2-deposited microfiber photonic device. Through a band-pass filter, each multi-soliton state was investigated separately. The bound soliton has periodic spectral modulation of 1.55 nm with a corresponding pulse separation of 5.16 *** harmonic mode-locking soliton has the repetition rate of 479 MHz, corresponding to the 65th harmonic of the fundamental repetition rate. The results indicated that there exist more possibilities of different multi-soliton composites, which would enhance our understanding of multi-soliton dynamics.

关键词： Coexistence of bound soliton and harmonic mode-locking soliton in an ultrafast fiber laser based on MoS2-deposited microfiber photonic device

分析早期目标导向活动对机械通气患者睡眠质量及ICU获得性衰弱的影响

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世界睡眠医学杂志 2024年第7期11卷 1633-1636页

作者：骆爱萍陈兰兰黄梅香泉州市第一医院泉州362000 福建中医药大学附属康复医院福州350000

目的:分析早期目标导向活动对机械通气患者睡眠质量及ICU获得性衰弱的影响。方法:选取2023年2月至2024年3月于泉州市第一医院重症监护病房接受机械通气治疗的患者80例作为研究对象,采取整体抽样法将患者分为对照组和观察组,每组40例。... 详细信息

目的:分析早期目标导向活动对机械通气患者睡眠质量及ICU获得性衰弱的影响。方法:选取2023年2月至2024年3月于泉州市第一医院重症监护病房接受机械通气治疗的患者80例作为研究对象,采取整体抽样法将患者分为对照组和观察组,每组40例。对照组给予常规护理干预,观察组在常规护理基础上开展早期目标导向活动干预,采用匹兹堡睡眠质量指数(PSQI)比较2组患者干预前后睡眠质量的变化,采用健康调查简表(SF-36)比较2组患者干预前后生命质量的变化,比较2组的临床指标,包括机械通气时间、ICU住院时间、总住院时间,并比较2组患者获得性衰弱的影响。结果:干预后,观察组PSQI评分显著低于对照组,观察组生命质量SF-36评分显著高于对照组,差异均有统计学意义(均P<0.05);干预后,观察组的机械通气时间、ICU住院时间、总住院时间均显著短于对照组,差异均有统计学意义(均P<0.05);干预后,观察组获得性衰弱发生率显著低于对照组,差异均有统计学意义(均P<0.05)。结论:早期目标导向活动的运用更有利于缩短机械通气患者的治疗与住院时间,降低获得性衰弱的发生风险,同时可显著改善患者的睡眠质量和生命质量,值得临床推广应用。

关键词：重症监护病房机械通气早期目标导向活动睡眠质量获得性衰弱生命质量临床指标干预效果

Chromosomal localization of a novel retinoic acid induced gene RA28 and protein distribution of its encoded protein

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Chinese Science Bulletin 2000年第20期45卷 1857-1862页

作者： LIU Zhihua luo aiping WANG Xiuqin WU Min National Laboratory of Molecular Oncology Department of Cell BiologyCancer InstituteChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100021China

Gene RA28 is a retinoic acid induced novel gene isolated in our laboratory previously. All-trans retinoic acid (ATRA) was used to induce lung adenocarcinoma cell line GLC-82, and RA28 was obtained by subtractive hybridization. Green fluorescent protein (GFP) has emerged as a unique tool for examining introcellular phenomena in living cells. GFP possesses an intrinsic fluorescence at 488 nm that does not require other co-factors. In this report, an eukaryotic expression plasmid pEGFP-C1-RA28 was constructed and transfected with parental cell line GLC-82 to analyze protein expression and its distribution in living cells. Moreover, radiation hybrid (RH) technique was used to localize RA28 to the chromosome. The results show that gene RA28 is mapped to the chromosome 19q13.1 region, its encoded protein is distributed on cell membrane. All the results further demonstrate that GFP and RH techniques are accurate, fast, repetitive, and will be powerful methods for investigating the gene and protein

关键词： green fluorescent protein (GFP) radiation hybrid (RH) gene localization protein localization RA28.

STUDY ON CONCENTRATING SULFURIC ACID SOLUTION BY MEMBRANE DISTILLATION WITH METAL - PTFE COMPOSITE MEMBRANE

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Journal of Central South University 1999年第2期11卷 95-98页

作者： Guiqing Zhang Qixiu Zhang Kanggen Zhou aiping luo 1. Department of Metallurgical Science and Engineering Central South University of Technology 410083 Changsha China

concentrating sulfuric acid by membrane distillation in a flat sheet direct contact membrane distillation device with a self made metal PTFE composite membrane has been studied. The effect of sulfuric acid concentration of feed, the flowrate and liquor temperature in high temperature side and low temperature side on the flux and separation efficiency is investigated. The stability of this composite membrane is also inspected. The experimental results show that the metal PTFE composite membrane can be used in membrane distillation, and its properties are very stable. It is feasible to concentrate sulfuric acid by membrane distillation with this membrane.

关键词： metal PTFE composite membrane membrane distillation sulfuric acid

TREATMENT OF LOW CONCENTRATION LYE OF RED MUD MOUND

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Journal of Central South University 1999年第2期11卷 73-77页

作者： Qixiu Zhang aiping luo Chongguang Shi Qicai Zheng 1. Laboratory of Separation Science and Engineering in Metallurgy Central South University of Technology 410083 Changsha China 2. Light Metal Research Institute of Guizhou Aluminum Plant 550058 Guiyang China

Based on the systematic experiment of treating low concentration lye in the red mud mound, several key problems in the selection of technological process for industrial trial, such as aluminum precipitation in the process of electrodilalysis, dealuminum with carbon dioxide at low temperature, the selection of the technology for electrodialysis and estimation of benefit of the trial production line, are studied in the paper. For a production line with the handling capacity of 50 m 3/h, its annual direct economic benefit can reach RMB 4 million yuan, calculated by 300 working days a year.

关键词： electrodialysis dealuminum with CO_2 recovery alkali alumina

Effect of Scanning Beam Profile to Fabricate Fused Fiber Tapers by CO_2 Laser Irradiation Method

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光学学报 2003年第S1期23卷 121-122页

作者： Bayle Fabien luo aiping Marin Emmanuel Meunier Jean-Pierre Laboratoire TSI UMR CNRS 5516 Saint Etienne FranceLaboratoire TSI UMR CNRS 5516 Saint Etienne FranceLaboratoire TSI UMR CNRS 5516 Saint Etienne FranceLaboratoire TSI UMR CNRS 5516 Saint Etienne France

Beam uniformity is a crucial building block of CO2 experiments aimed at fusing and stretching optical fibers in a lossless manner. When the irradiation beam is expanded through a galvanometer mirror, ways to achieve b... 详细信息

关键词： of in on as it by Effect of Scanning Beam Profile to Fabricate Fused Fiber Tapers by CO2 Laser Irradiation Method