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Investigations of the mechanical response of dummy HTPB propellant grain under ultrahigh acceleration overload conditions using onboard flight-test measurements

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Defence Technology（防务技术） 2024年第2期32卷 473-484页

作者： yiming Zhang Ningfei Wang Weihua Ma Ran Wang Long bai Yi Wu School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China Beijing System Design Institute of Electro-mechanic Engineering Beijing 100854China Xi'an Changfeng Research Institute of Mechanism and Electricity Xi'an 710065China

In this paper,to study the mechanical responses of a solid propellant subjected to ultrahigh acceleration overload during the gun-launch process,specifically designed projectile flight tests with an onboard measurement system were *** projectiles containing dummy HTPB propellant grains were successfully recovered after the flight tests with an ultrahigh acceleration overload value of 8100 *** onboard-measured time-resolved axial displacement,contact stress and overload values were successfully obtained and *** compression tests of the dummy HTPB propellant used in the gunlaunched tests were carried out at low and intermediate strain rates to characterize the propellant's dynamic properties.A linear viscoelastic constitutive model was employed and applied in finite-element simulations of the projectile-launching *** the launch process,the dummy propellant grain exhibited large deformation due to the high acceleration overload,possibly leading to friction between the motor case and propellant *** calculated contact stress showed good agreement with the experimental results,though discrepancies in the overall displacement of the dummy propellant grain were *** dynamic mechanical response process of the dummy propellant grain was analysed in *** results can be used to estimate the structural integrity of the analysed dummy propellant grain during the gun-launch process.

关键词： Gun-launched flight test Dummy HTPB propellant Onboard measurements Utrahigh overload Mechanical response

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Progress of Microgravity Material Research During the Period of 2007-2009

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空间科学学报 2010年第5期30卷 504-515页

作者： Chen Nuofu bai yiming Chen Wanchun Zhou Yanfei Luo Xinghong Yu Yude Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 Institute of Physics Chinese Academy of Sciences Chinese Academy of Sciences Key Laboratory of Materials for Energy Conversion Shanghai Institute of Ceramics Chinese Academy of Sciences Institute of Metal Research Chinese Academy of Sciences School of Renewable Energy North China Electricity Power University

Orbital experimental researches on crystal growth of Mn-doped GaSb and Bi2Se0.21Te2.79 are briefly *** space experiments were completed in September of 2007 on broad the Foton-M3 satellite of ***-based researches on the solidification behaviors of Al-Al3Ni,AlAl2Cu,Ag-Cu eutectic,Al-Pb monotectic and Cu-Co peritectic alloys in a 50-meter-high drop tube were *** experimental results on the ultrasonic field and the temperature recycling induced to chiral symmetry breaking of NaClO3 crystal also were reported in the present paper.

关键词：微重力材料空间实验晶体生长凝固行为包晶合金对称破缺温度诱导

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Ag nanoparticles preparation and their light trapping performance

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Science China(Technological Sciences) 2013年第1期56卷 109-114页

作者： bai yiming WANG Jun YIN ZhiGang CHEN NuoFu ZHANG XingWang FU Zhen YAO JianXi LI Ning HE HaiYang GULI MiNa School of Renewable Energy Engineering North China Electric Power University The New and Renewable Energy of Beijing Key Laboratory Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of Sciences National Engineering Research Center for Optoelectronic Devices Institute of SemiconductorsChinese Academy of Sciences

Ag nanoparticles were fabricated on Si substrates by radio-frequency magnetron sputtering and thermal annealing *** was found that Ag nanoparticles are ellipsoid at low annealing temperature,but the axis ratio decreases with the increase of annealing temperature,and a shape transformation from ellipsoid to sphere occurs when the temperature increases to a critical *** experimental results showed that the surface plasmon resonances depend greatly on the nanoparticles'shape and size,which is in accordance with the theoretical calculation based on discrete dipole *** results of forward-scattering efficiency(FSE) and light trapping spectrum(LTS) showed that Ag nanoparticles annealed at 400°C could strongly enhance the light harvest than those annealed at 300 and 500°C,and that the LTS peak intensity of the former is 1.7 and 1.5 times stronger than those of the later two samples,*** conclusions obtained in this paper showed that Ag ellipsoid nanoparticles with appropriate size is more favorable for enhancing the light trapping.

关键词： thin film solar cells light trapping structure plasmonic nanoparticles

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Solution-Processed Titanium Chelate Used as Both Electrode Modification Layer and Intermediate Layer for Efficient Inverted Tandem Polymer Solar Cells

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Chinese Journal of Chemistry 2018年第3期36卷 194-198页

作者： Zhenzhen Shi Hao Liu Lixing Xia yiming bai Fuzhi Wang Bing Zhang Tasawar Hayat Ahmed Alsaedi CandZhan'ao Tan State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China Department of Mathematics Quiad-l-Azam University Islamabad Pakistan NAAM Research Group Faculty of Science King Abdulaziz University Jeddah 21589 Saudi Arabia

ABSTRACT Organic polymer solar cells （PSCs） have attracted increasing attention due to light weight, low cost, flexibility and roll-to-roll manufacturing. However, the limited light harvest range of the photoactive layer greatly restrains the power conversion efficiency （PCE） enhancement. In order to expand the light absorption range and further enhance the PCE of the PSCs, tandem structures have been designed and demonstrated. In tandem solar cell, the intermediate layer （IML） plays a critical role in physically and electrically connection of the two subcells. Herein, we apply titanium （diisopropoxide） bis（2,4-pentanedionate）（TIPD） as both electrode modification layer and intermediate layer to investigate the feasibility in inverted tandem polymer solar cells. The same photoactive layers of PTB7-Th：PC71BM are adopted in both front and rear subcells to simplify the evaluation of effectiveness of TIPD layer in tandem structures. By modulating the treatment condition of IML and the thickness of photoactive layer, efficient inverted tandem PSCs have been achieved with minimized voltage loss and excellent charge transportation, giving a best Voc of 1.54 V, which is almost two times that of the single bulk heterojunction （BHJ）-PSC （0.78 V） and an enhanced PCE up to 8.11%.

关键词： polymer solar cells titanium (diisopropoxide) bis(2,4-pentanedionate) intermediate layer tandem structure

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Diving dynamics identification and motion prediction for marine crafts using field data

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Journal of Ocean Engineering and Science 2024年第4期9卷 391-400页

作者： yiming Zhong Caoyang Yu Yulin bai Zheng Zeng Lian Lian School of Oceanography Shanghai Jiao Tong UniversityShanghai 200030China Key Laboratory of Polar Ecosystem and Climate Change Ministry of EducationShanghai Jiao Tong UniversityShanghai 200030China Shanghai Key Laboratory of Polar Life and Environment Sciences Shanghai Jiao Tong UniversityShanghai 200030China State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Ensuring accurate parameter identification and diving motion prediction of marine crafts is essential for safe navigation,optimized operational efficiency,and the advancement of marine *** this,this paper proposes an instrumental variable-based least squares(IVLS)***,aiming to balance complexity with accuracy,a decoupled diving model is constructed,incorporating nonlinear actuator characteristics,inertia coefficients,and damping ***,a discrete parameter identification matrix is designed based on this dedicated model,and then a IVLS algorithm is innovatively derived to reject measurement ***,the stability of the proposed algorithm is validated from a probabilistic point of view,providing a solid theoretical ***,performance evaluation is conducted using four depth control datasets obtained from a piston-driven profiling float in Qiandao Lake,with desired depths of 30 m,40 m,50 m,and 60 *** on the diving dynamics identification results,the IVLS algorithm consistently shows superior performance when compared to recursive weighted least squares algorithm and least squares support vector machine algorithm across all depths,as evidenced by lower average absolute error(AVGAE),root mean square error(RMSE),and maximum absolute error values and higher determination coefficient(R2).Specifically,for desired depth of 60 m,the IVLS algorithm achieved an AVGAE of 0.553 m and RMSE of 0.655 m,significantly outperforming LSSVM with AVGAE and RMSE values of 8.782 m and 11.117 m,***,the IVLS algorithm demonstrates a remarkable generalization capability with R2 values consistently above 0.95,indicating its robustness in handling varied diving dynamics.

关键词： Marine craft Parameter identification Motion prediction Instrumental variable-based least-squares algorithm Diving dynamics model

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Improved performance of GaAs-based micro-solar cell with novel polyimide/SiO_2/TiAu/SiO_2 structure

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Science China(Technological Sciences) 2011年第4期54卷 830-834页

作者： bai yiming WANG Jun WANG Yu ZHANG Han CHEN NuoFu YAO JianXi HUANG TianMao WANG YanShuo ZHANG XingWang WU JinLiang New and Renewable Energy of Beijing Key Laboratory North China Electric Power UniversityBeijing 102206China National Engineering Research Center for Optoelectronic Devices Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China

A novel interconnected structure consisting of a conventional polyimide layer(PM) and an additional SiO2/TiAu/SiO2 sandwich multilayer has been firstly proposed for improving the performance of GaAs micro-solar cell *** specific experimental investigations on the array with 108 unit cells have demonstrated that the novel structure of PM/SiO2/TiAu/SiO2 can effectively enhance the open-circuit voltage from 75 to 84 V and the fill factor from 35% to 57%.The performance improvement of our devices can be attributed to two ***,the TiAu shielding film can prevent the incident light from penetrating into the GaAs substrate so as to induce the serious substrate leakage ***,the compact texture of SiO2 in the novel structure can reduce the perimere recombination due to the crackle or shrinkage of *** is indicated that the novel structure can distinctly reduce the leakage current and improve output characteristic of micro-solar cells.

关键词： micro-solar cell SI-GaAs leakage current insulating layer

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China's Automobile Recall System and Recall Implementation Status

China's Automobile Recall System and Recall Implementation S...

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2021中国汽车工程学会年会暨展览会

作者： bai yiming School of Materials Science and Engineering Tianjin University

The recall of defective automobile products is an important part of the recall of defective products in *** " Provisions on the Administration of Recall of Defective Auto Products",which established and implemented in 2004,officially opening the prelude of China’s defective product *** the implementation of the automobile recall system in 2004 to December 31,2019,China has implemented 1,992 defective car recalls in 15 years,with a total of 75,780,128 vehicles *** on the public information,this paper expounds the development of China’s defective automobile recall system,makes accurate statistical analysis on the long-term data from 2004 to 2019 and the short-term data from 2015 to 2019,so as to put forward suggestions for the quality management of the automobile industry and the improvement of the recall *** the increase of car ownership in China,the problem of car quality has received more and more *** an important part of automobile quality management,Defective automobile recall system in China was established in 2004,and has undergone a transformation from departmental rules to administrative *** addition,relevant implementation measures have been issued to continuously improve the degree of standardization and *** establishment of defect recall plays an obvious role in ensuring vehicle product quality and reducing consumer *** automobile manufacturers,automobile recall is a work of strategic significance,which is usually accompanied by huge human and material *** analysis of the change trend of recall data and the cause of recall data will provide an important reference for the improvement of defect recall system and the quality management of automobile industry in *** this paper,based on domestic and foreign research on automobile recall,the overall situation of China’s automobile recall system in the past 15 years and the recent situation of automobile recall from 2015 to 2019 a

关键词： Automotive safety Product recall Quality management Defect investigation

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工程教育非技术能力培养体系的改革与实践

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创新创业理论研究与实践 2024年第11期7卷 72-74+81页

作者：周怡然王勇李广强申丽然白一鸣大连海事大学船舶电气工程学院

非技术能力培养在工程教育专业认证中起重要作用，是推进以学生为中心的高等教育教学改革的基础工作，是学生综合素质提升的有效抓手，也是学生培养过程中的难点。该文结合大连海事大学测控技术与仪器专业的探索实践，分析如何优化面向... 详细信息

非技术能力培养在工程教育专业认证中起重要作用，是推进以学生为中心的高等教育教学改革的基础工作，是学生综合素质提升的有效抓手，也是学生培养过程中的难点。该文结合大连海事大学测控技术与仪器专业的探索实践，分析如何优化面向工程教育专业认证的非技术能力培养体系，探讨课程方案制定、多元化教学方法设计、重点培养环节强化、评价方法设计等问题，以期为相关专业的建设改革提供参考。

关键词：非技术能力工程教育专业认证课程方案人才培养复杂工程问题课程评价

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Size-Controllable Metal Chelates as Both Light Scattering Centers and Electron Collection Layer for High-Performance Polymer Solar Cells

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CCS Chemistry 2021年第10期3卷 37-49页

作者： Hao Liu Runnan Yu yiming bai Yan Zeng Yuanping Yi Jun Lin Jianhui Hou Zhan’ao Tan State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206 Beijing Advanced Innovation Center for Soft Matter Science and Engineering State Key Laboratory of Organic–Inorganic CompositesBeijing University of Chemical TechnologyBeijing 100029 Beijing National Laboratory for Molecular Sciences Institute of ChemistryChinese Academy of SciencesBeijing 100190

An electron collection layer(ECL)between a photoactive overlay and an electrode plays a crucial role in optimizing the light field and charge extraction in bulk-heterojunction(BHJ)polymer solar cells(PSCs).However,the typical thickness of the photoactive layer is thinner than its optical path lengths,limiting further improvement of light absorption and device performance.

关键词： metal chelates polymer solar cells hafni-um acetylacetone scattering center optimizing light field

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Efficient Steering Control for Long-Term Unmanned Surface Vehicle

Efficient Steering Control for Long-Term Unmanned Surface Ve...

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第37届中国控制会议

作者： yiming bai Yongsheng Zhao Dalian Maritime University

Long-term unmanned surface vehicle（USV） is an effective means in ocean environmental monitoring and target detection for extended *** steering control is the basis and premise for long-term USV to improve the adaptability and the endurance ability in complex sea *** this paper,an efficient control algorithm is developed with the aid of fuzzy inference system and dynamic surface control ***,based on data mining technology the fuzzy inference system is employed to identify the unknown yaw dynamics for the USV in presence of sea environmental disturbance and measurement ***,a robust adaptive steering law is established by using the dynamic surface control（DSC） design approach in Lyapunov stability *** simulation,the simulation object is the independent designed "Lanxin" USV of Dalian Maritime University in *** results are given to validate the efficacy of the proposed method.

关键词： USV FIS DSC

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