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Streamer‐to‐precursor transition in N_(2)-SF_(6)mixtures under positive repetitive submicrosecond pulses

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High Voltage 2022年第2期7卷 382-389页

作者： Zheng Zhao Zhifeng dai Anbang Sun Jiangtao Li School of Electrical Engineering Xi'an Jiaotong UniversityXi'anChina

The evolution of discharge dynamics in N_(2)-SF_(6)mixtures under long‐term repetitive submicrosecond pulses is investigated based on pulse‐sequence resolved electrical and optical *** effects of gas pressure,pulse repetition frequency(PRF),and SF6 concentration on discharge evolutions are *** number of applied pulses before breakdown is shown to non‐linearly decrease with increasing PRF for all included gas pressures and SF6 concentrations.A higher SF6 concentration is favourable for increasing relative insulation capability under repetitive *** complexities of discharge evolutions under repetitive pulses are reported for the first time for the discharge mechanism transition when a strong electronegative gas is introduced.A pulse‐to‐pulse progressive streamer(first discharge)‐to‐precursor(before breakdown)transition is observed in an N_(2)-SF_(6)mixture under positive repetitive pulses and is less dependent on gas pressure than traditional *** formation of a precursor section is jointly supported by electrical and optical *** discharge mechanism transition and the detour phenomenon under repetitive pulses are discussed based on the effects of space charges on the spatial distribution of the electric field strength.

关键词： breakdown transition second

基于船舶操纵模拟器的泉州湾三维视景数据库开发研究

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天津航海 2024年第2期 43-46页

作者：张泽慧戴官全泉州师范学院交通与航海学院福建泉州362000

针对船舶操纵模拟器尚未建立与泉州本地船员相关的模拟场景的问题,以船舶操纵模拟器为平台,根据视景仿真要求,文章通过Creator开发泉州湾三维视景数据库,逼真地显示了该水域三维仿真视景,船员通过船舶操纵模拟器进行交互模拟训练,减少... 详细信息

针对船舶操纵模拟器尚未建立与泉州本地船员相关的模拟场景的问题,以船舶操纵模拟器为平台,根据视景仿真要求,文章通过Creator开发泉州湾三维视景数据库,逼真地显示了该水域三维仿真视景,船员通过船舶操纵模拟器进行交互模拟训练,减少泉州湾船舶安全事故。

关键词：泉州湾三维视景船舶操纵模拟器船员培训

The microstructure of a single crystal superalloy after different aging heat treatments

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Rare Metals 2018年第3期37卷 210-216页

作者： Xiao-dai Yue Jia-Rong Li Xiao-Guang Wang Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials

To study the influence of aging heat treatments on the microstructure of single crystal superalloys with high content of refractory elements and optimal the aging heat treatment regimes, a single crystal superalloy containing 22 wt% refractory elements was *** show that for the experimental alloy, even the homogenization-solution heat treatment for 25 h cannot homogenize the alloying elements completely. During primary aging heat treatment, γ＇ phase grows larger and turns to regular cubes. Higher aging temperature induces larger γ＇ cubes. For specimens with primary aging heat treated at 1120 ℃,γ＇ morphology does not change apparently during secondary aging heat treatment. For specimens with primary aging heat treatment at 1150 ℃,γ＇phase in interdendrite grows obviously comparing with that in dendrites. By analyzing the precipitating kinetics of γ＇phase, it is found that owning to the dendrite segregation and different aging heat treatment temperatures, γ＇ phase at different regions grows under the control of different factors at different aging heat treatment stages. The two controlling factors that are driving forces of phase transformation and element diffusion rate induce obviously different growth rates of γ＇ phase. As a result, the γ＇-precipitating behaviors are variable based on different solute concentrations and aging temperatures. For advanced single crystal superalloys that are supposed to be used at relatively high temperatures, the final γ＇ size after aging heat treatment is suggested to be close to the crossing point of diffusion controlling curve and driving force controlling curve corresponding to the serving temperature. And then,high-temperature properties can be improved.

关键词： Single crystal superalloy Aging heat treatment γ' precipitation Kinetics

糖尿病合并腰椎压缩性骨折患者术后血糖控制中达格列净的应用价值

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糖尿病新世界 2024年第9期27卷 91-93,97页

作者：杨雅燕戴艺绒章亚青中国人民解放军陆军第七十三集团军医院骨科福建厦门361000

目的探究达格列净应用于手术治疗的糖尿病合并腰椎压缩性骨折患者血糖控制中的效果。方法回顾性选取2022年6月—2024年2月中国人民解放军陆军第七十三集团军医院收治的80例糖尿病合并腰椎压缩性骨折患者的临床资料,均接受腰椎成形术治疗... 详细信息

目的探究达格列净应用于手术治疗的糖尿病合并腰椎压缩性骨折患者血糖控制中的效果。方法回顾性选取2022年6月—2024年2月中国人民解放军陆军第七十三集团军医院收治的80例糖尿病合并腰椎压缩性骨折患者的临床资料,均接受腰椎成形术治疗,根据术后血糖控制中所用药物不同分为对照组(n=40,二甲双胍与甘精胰岛素联用)、观察组(n=40,在对照组基础上与达格列净联用),对比两组血糖控制情况、不良反应及临床疗效。结果治疗2个月后,观察组各项血糖水平均低于对照组,差异有统计学意义(P均0.05)。观察组临床疗效高于对照组,差异有统计学意义(P<0.05)。结论糖尿病合并腰椎压缩性骨折患者术后在常规降糖措施基础上加入达格列净,血糖控制效果更佳,不良反应发生风险较低。

关键词：腰椎压缩性骨折糖尿病血糖控制达格列净二甲双胍甘精胰岛素

Image De-occlusion via Event-enhanced Multi-modal Fusion Hybrid Network

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Machine Intelligence Research 2022年第4期19卷 307-318页

作者： Si-Qi Li Yue Gao Qiong-Hai dai Beijing National Research Center for Information Science and Technology Tsinghua UniversityBeijing 100084China Institute for Brain and Cognitive Sciences Tsinghua UniversityBeijing 100084China Beijing Laboratory of Brain and Cognitive Intelligence Beijing Municipal Education CommissionTsinghua UniversityBeijing 100084China Key Laboratory for Information System Security School of SoftwareTsinghua UniversityBeijing 100084China Department of Automation Tsinghua UniversityBeijing 100084China

Seeing through dense occlusions and reconstructing scene images is an important but challenging *** framebased image de-occlusion methods may lead to fatal errors when facing extremely dense occlusions due to the lack of valid information available from the limited input occluded *** cameras are bio-inspired vision sensors that record the brightness changes at each pixel asynchronously with high temporal ***,synthesizing images solely from event streams is ill-posed since only the brightness changes are recorded in the event stream,and the initial brightness is *** this paper,we propose an event-enhanced multi-modal fusion hybrid network for image de-occlusion,which uses event streams to provide complete scene information and frames to provide color and texture *** event stream encoder based on the spiking neural network(SNN)is proposed to encode and denoise the event stream efficiently.A comparison loss is proposed to generate clearer *** results on a largescale event-based and frame-based image de-occlusion dataset demonstrate that our proposed method achieves state-of-the-art performance.

关键词： Event camera multi-modal fusion image de-occlusion spiking neural network(SNN) image reconstruction

Fault Diagnosis of Proton Exchange Membrane Fuel Cell Based on Nonlinear Impedance Spectrum

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Automotive Innovation 2023年第4期6卷 597-610页

作者： Hao Yuan Shaozhe Zhang Xuezhe Wei Haifeng dai School of Automotive Studies Tongji UniversityShanghaiChina

Electrochemical impedance spectroscopy(EIS)contributes to developing the fault diagnosis tools for fuel cells,which is of great significance in improving service *** conventional impedance measurement techniques are limited to linear responses,failing to capture high-order harmonic ***,nonlinear electrochemical impedance analysis incorporates additional nonlinear information,enabling the resolution of such *** study proposes a novel multi-stage fault diagnosis method based on the nonlinear electrochemical impedance spectrum(NEIS).First,the impact of alternating current excitation amplitude on NEIS is ***,a series of experiments are conducted to obtain NEIS data under various fault conditions,encompassing recoverable faults like flooding,drying,starvation,and their mixed faults,spanning different degrees of fault *** on these experiments,both EIS and NEIS datasets are established,and principal component analysis is utilized to extract the main features,thereby reducing the dimensionality of the original ***,a fault diagnosis model is constructed with the support vector machine(SVM)and random forest algorithms,with model hyperparameters optimized by a hybrid genetic particle swarm optimization(HGAPSO)*** results show that the diagnostic accuracy of NEIS is higher than that of traditional EIS,with the HGAPSO-SVM model achieving a 100%accurate diagnosis under the NEIS dateset and self-defined fault labels.

关键词： Fuel cell Nonlinear electrochemical impedance spectrum Fault diagnosis

昂丹司琼联合地塞米松治疗恶性肿瘤化疗后恶心呕吐的临床效果分析

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中外医疗 2024年第23期43卷 17-20页

作者：李林代珊珊罗巍黔西南布依族苗族自治州人民医院肿瘤科贵州兴义562400

目的比较恶性肿瘤化疗后恶心呕吐患者应用昂丹司琼联合地塞米松与昂丹司琼单药治疗的临床效果。方法方便选取2020年1月—2023年9月黔西南布依族苗族自治州人民医院收治的88例行化疗后恶心呕吐患者作为研究对象,根据治疗方案的不同分为... 详细信息

目的比较恶性肿瘤化疗后恶心呕吐患者应用昂丹司琼联合地塞米松与昂丹司琼单药治疗的临床效果。方法方便选取2020年1月—2023年9月黔西南布依族苗族自治州人民医院收治的88例行化疗后恶心呕吐患者作为研究对象,根据治疗方案的不同分为研究组(44例)及对照组(44例)。对照组予以昂丹司琼单药治疗,研究组在对照组治疗基础上联合地塞米松。对比两组临床疗效、急性及延迟性恶心和呕吐控制率、不良反应发生情况。结果对照组治疗总有效率为63.64%(28/44),低于研究组的84.09%(37/44),差异有统计学意义(χ^(2)=4.768,P0.05)。结论昂斯丹琼联合地塞米松在恶性肿瘤化疗后恶心呕吐患者中应用效果显著,可有效防治化疗后的急性与延迟性恶心及呕吐症状,安全可靠,具有一定的临床价值意义。

关键词：恶性肿瘤化学治疗恶心呕吐昂丹司琼地塞米松胃肠激素

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Enhanced conversion of α-cellulose to 5-HMF in aqueous biphasic system catalyzed by FeCl_(3)-CuCl_(2)

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Chinese Chemical Letters 2021年第7期32卷 2233-2238页

作者： Lilin Zhang Yinbing Tian Yuanyuan Wang Liyi dai Shanghai Key Laboratory of Green Chemistry and Green Process College of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200241China

This study was to investigate the optimal additions of the cellulose decomposition reaction to obtain the most yield of 5-HMF and other furan derivatives in various biphasic systems with FeCl_(3)-CuCl_(2) mixed catalysts,and explore its depolymerization kinetics.A series of controllable reactions have been performed under mild environmentally friendly *** experiment results showed that49.13 wt%of 5-HMF was the maximum production along with 2.98 wt%other furan derivatives catalyzed by mixed Lewis acid FeCl_(3)-CuCl_(2) under the two phases which included high concentration NaCl aqueous phase and n-butanol organic phase at 190℃for 45 *** conclusion suggested that two-phase systems benefited the yield of 5-HMF,furan derivatives via extracting the target products from reaction phase to organic phase to avoid rehydration of *** kinetic calculation revealed the conversion with mixed catalysts had lower reaction apparent activation energy(21.65 kJ/mol,190-230℃)and the reaction rate was faster than that with acid-based *** on experiment exploration,the probable mechanism of cellulose decomposition with FeCl_(3)-CuCl_(2) was proposed.

关键词： Cellulose Two phase Mixed catalysts Depolymerization 5-HMF

项目制教学在智能建造创新型人才培养中的应用研究

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科教文汇 2024年第10期 85-89页

作者：黎翔马亚飞戴理朝长沙理工大学土木工程学院湖南长沙410114

随着人工智能、物联网、大数据等高新技术的快速发展,智能建造成为我国建筑业向工业化、信息化和智能化发展的重要推动力量。传统工科教育模式对实践、跨学科和创新等能力的培养较为欠缺,无法适应和满足智能建造创新型人才培养。在探索... 详细信息

随着人工智能、物联网、大数据等高新技术的快速发展,智能建造成为我国建筑业向工业化、信息化和智能化发展的重要推动力量。传统工科教育模式对实践、跨学科和创新等能力的培养较为欠缺,无法适应和满足智能建造创新型人才培养。在探索欧林工学院项目制教学的基础上,对适应我国教育现状的智能建造项目制教学方案进行探索和研究,以实践能力、知识灵活运用能力和创新能力等的培养为主线,提出了教学改革建议。最后,以智能虚拟预拼装这一实际项目为例,对项目制教学的设计、操作和考核等进行实战介绍,以推动项目制教学在我国智能建造创新型人才培养中的发展和应用。

关键词：人才培养教学改革新工科智能建造项目制教学课程体系实践教学