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Safety analysis on truing process of solid propellant

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Defence Technology（防务技术） 2018年第5期14卷 612-615页

作者： Jun li Qing-jie jiao Hui ren State Key Laboratory of Explosive Science and Technology Beijing Institute of TechnologyBeijing 100081China Science and Technology on Aerospace Chemical Power Laboratory Xiangyang 441003China

In order to investigate safety character of solid propellant, the truing process was analyzed by a thermalmechanical coupled finite element method. Based on the viscoelastic integral constitutive relation, the temperature response in truing process was calculated. The result showed that the maximum temperature in solid propellant truing process could attain up to 65 ℃ when the truing velocity was 10 mm/s and the truing thickness was 1 mm, and there was no remarkable temperature change under the truing thickness of 1.0 mm, 1.5 mm and 2.5 mm. The hazard in truing process of solid propellant was mainly close to the edge of cutting area.

关键词： Solid propellant Truing process Safety Finite element method

Microstructure, Mechanical and Wear Resistance Properties of AlCoCrFeNi_2.1-xNi₃Al Eutectic High-Entropy Alloy Matrix Composites

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ACTA METALLURGICA SINICA-ENGliSH LETTERS 2024年第12期37卷 2019-2028页

作者： li, li Kong, Xiao Jiang, Hui jiao, Wenna Jiang, Di ren, Jichao Coll Intelligent Engn Taishan Coll Sci & Technol Tai An 271038 Peoples R China Shandong Univ Sci & Technol Coll Mech & Elect Engn Qingdao 266590 Peoples R China Dalian Univ Technol Sch Mat Sci & Engn Dalian 116081 Peoples R China Qingdao Kompress Energy Technol Co Ltd Qingdao 266073 Peoples R China

AlCoCrFeNi2.1-xNi(3)Al (x = 0, 5.0, 7.5, and 10 wt%, denoted as Ni(3)Al0, Ni(3)Al5.0, Ni(3)Al7.5, and Ni(3)Al10) eutectic high-entropy alloy (EHEA) matrix composites were fabricated by mechanical alloying and spark plasma sintering methods. The effects of Ni3Al content on the microstructures, mechanical and wear properties of AlCoCrFeNi2.1 EHEA were investigated. The results indicate that the AlCoCrFeNi2.1-xNi(3)Al composites present cellular grid morphologies composing of FCC/Ll(2) and B2 phases, and a small amount of Al2O3 and Cr7C3 phases. The addition of Ni3Al significantly enhanced the compressive yield strength, compressive fracture strength, compressive strain and wear properties of the AlCoCrFeNi2.1 composites. In particular, the Ni(3)Al10 composite exhibits excellent comprehensive mechanical properties. The compressive yield strength, compressive fracture strength and compressive strain of the Ni(3)Al10 composite, are 1845 MPa, 2301 MPa and 10.1%, respectively. The friction coefficient, wear width and depth, and mass loss of the Ni(3)Al10 composite were 0.40, 0.9 mm, 20.5 mm, 0.016 g, respectively. Moreover, the wear mechanism of the Ni(3)Al10 composite is major abrasive wear with a small amount of adhesive wear.

关键词： Eutectic high-entropy alloy composites Microstructures Mechanical properties Wear properties

Synthesis and characterization of mixing soft-segmented waterborne polyurethane polymer electrolyte with room temperature ionic liquid

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Chinese Chemical Letters 2009年第5期20卷 519-522页

作者： Yue jiao li Feng Wu ren Jie Chen School of Chemical Engineering and Environment Beijing Institute of Technology Beijing 100081 China National Development Center for High Technology Green Material Beijing 100081 China

Composite polymer electrolytes based on mixing soft-segment waterborne polyurethane （WPU） and 1-butyl-3-methylimidazolium bis[（trifluoromethyl）sulfonyl]imide （BMImTFSI） have been prepared and characterized. The addition of BMImTFSI results in an increase of the ionic conductivity. At high BMImTFSI concentration （BMImTFSI/WPU = 3 in weight ratio）, the ionic conductivity reaches 4.27 × 10^-3 S/cm at 30 ℃. These composite polymer electrolytes exhibit good thermal and electrochemical stability, which are high enough to be applied in lithium batteries.

关键词： Composite polymer electrolytes Ionic liquid Waterborne polyurethane Ionic conductivity 1-Butyl-3-methylimidazoliumbis[(trifluoromethyl) sulfonyl]imide

Modulating electronic structure of CoSe_(2) by Ni doping for efficient electrocatalyst for hydrogen evolution reaction

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Rare Metals 2022年第3期41卷 901-910页

作者： Xiao-jiao Fang li-Ping ren Fang li Zai-Xing Jiang Ze-Gao Wang School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001China College of Materials Science and Engineering Sichuan UniversityChengdu 610065China

Developing robust and efficient non-noble electrocatalysts for the hydrogen evolution reaction(HER)is paramount for sustainably producing hydrogen fuel from electrochemical water *** morphology and chemical composition are significant for fabricating electrocatalysts with superior activity and ***,novel Ni-doped CoSe_(2)composites are prepared by a facile one-step hydrothermal *** optimized 1T-phase Co_(0.75)Ni_(0.25)Se_(2)shows excellent HER performance,exhibiting overpotential of as low as 172 mV at 10 mA·cm^(–2) and a small Tafel slope of 32.4 mV·dec^(–1) in 0.5 mol·L^(-1) H_(2)SO_(4)solution,approaching that of com-mercial Pt/C electrocatalyst(30.7 mV·dec^(–1)).Furthermore,the electrocatalyst possesses superior long-term stability under acidic *** measurements indicate that the homogeneous nanoparticles morphology,the unique electronic structure,and the 1T-phase are responsible for its superior HER *** work comes up with a promising strategy in synthesizing other earth-abundant and low-cost catalysts for industrial applications.

关键词： Hydrogen evolution reaction Ni-doped CoSe_(2) Electronic structure

Fretting Wear Characteristics of Nuclear Fuel Cladding in High-Temperature Pressurized Water

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Chinese Journal of Mechanical Engineering 2023年第4期36卷 326-338页

作者： Jun Wang Haojie li Zhengyang li Yujie Lei Quanyao ren Yongjun jiao Zhenbing Cai Key Lab of Advanced Technologies of Materials Tribology Research InstituteSouthwest Jiaotong UniversityChengdu 610031China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610213China

In pressurized water reactor(PWR),fretting wear is one of the main causes of fuel assembly ***,the operation condition of cladding is complex and harsh.A unique fretting damage test equipment was developed and tested to simulate the fretting damage evolution process of cladding in the PWR *** can simulate the fretting wear experiment of PWR under different temperatures(maximum temperature is 350℃),displacement amplitude,vibration frequency,and normal *** fretting wear behavior of Zr-4 alloy under different temperature environments was *** addition,the evolution of wear scar morphology,profile,and wear volume was studied using an optical microscope(OM),scanning electron microscopy(SEM),and a 3D white light *** show that higher water temperature evidently decreased the cladding wear volume,the wear mechanism of Zr-4 cladding changed from abrasive wear to adhesive wear and the formation of an oxide layer on the wear scar reduced the wear volume and maximum wear depth.

关键词： Fretting wear Cladding High temperature and high pressure Zirconium alloy

Development strategies and improved photocatalytic CO_(2) reduction performance of metal halide perovskite nanocrystals

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Journal of Energy Chemistry 2023年第8期83卷 397-422,I0011页

作者： Xianwei Fu Tingting ren Shilong jiao Zhihong Tian Jianjun Yang Qiuye li Engineering Research Center for Nanomaterials National&Local Joint Engineering Research Center for Applied Technology of Hybrid NanomaterialsHenan UniversityKaifeng 475004HenanChina Key LabforSpecialFunctional Materials of Ministry of Education Collaborative Innovation Centerof NanoFunctional Materials and ApplicationsHenan UniversityKaifeng 475004 HenanChina Shenzhen Research Institute of Henan University Shenzhen 518000GuangdongChina

In recent years,photocatalytic CO_(2)reduction reaction(CRR) has attracted much scientific attention to overcome energy and environmental issues by converting CO_(2)into high-value-added chemicals utilizing solar *** halide perovskite(MHP) nanocrystals(NCs) are recognized as an ideal choice for CRR owing to their outstanding optoelectronic *** great efforts have been devoted to designing more effective photocatalysts to optimize CRR performance,severe charge recombination,instability,and unsatisfactory activity have become major bottlenecks in developing perovskite-based *** this review,we mainly focus on the recent research progress in the areas of ***,a brief insight into reaction mechanisms for CRR and structural features of MHPs are ***,efficient modification approaches for the improvement of the photocatalytic activity and stability of the perovskite-based catalysts are comprehensively ***,the state-of-the-art achievements of perovskite-based photocatalysts for CRR are systematically summarized and discussed,which are focused on the modification approaches,structure design,and the mechanism of the CO_(2)reduction ***,the current challenges and future research perspectives in the design and application of perovskite materials are highlighted from our point of view to provide helpful insights for seeking breakthroughs in the field of *** review may provide a guide for scientists interested in applying perovskite-based catalysts for solar-to-chemical energy conversion.

关键词： Photocatalytic CO_(2)reduction MHP nanocrystals Structure design Properties Stability

J-comb: An image fusion algorithm to combine observations covering different spatial frequency ranges

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Science China(Physics,Mechanics & Astronomy) 2022年第9期65卷 138-156页

作者： Sihan jiao Yuxin lin Xiangyu Shui Jingwen Wu Zhiyuan ren Di li National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Centre for Astrochemical Studies Max-Planck-Institut f¨ur Extraterrestrische PhysikGarching 85748Germany Astrophysics Department Munich UniversityMunich 81679Germany NAOC-UKZN Computational Astrophysics Centre University of KwaZulu-NatalDurban 4000South Africa

Ground-based, high-resolution bolometric(sub)millimeter continuum mapping observations on spatially extended target sources are often subject to significant missing fluxes. This hampers accurate quantitative analyses. Missing flux can be recovered by fusing high-resolution images with observations that preserve extended structures. However, the commonly adopted image fusion approaches do not maintain the simplicity of the beam response function and do not try to elaborate the details of the yielded beam response functions. These make the comparison of the observations at multiple wavelengths not straightforward. We present a new algorithm, J-comb, which combines the high and low-resolution images linearly. By applying a taper function to the low-pass filtered image and combining it with a high-pass filtered image using proper weights, the beam response functions of our combined images are guaranteed to have near-Gaussian shapes. This makes it easy to convolve the observations at multiple wavelengths to share the same beam response functions. Moreover, we introduce a strategy to tackle the specific problem that the imaging at 850 μm from the present-date ground-based bolometric instrument and that taken with the Planck satellite do not overlap in the Fourier domain. We benchmarked our method against two other widely-used image combination algorithms, CASA-feather and MIRIAD-immerge, with mock observations of star-forming molecular clouds. We demonstrate that the performance of the J-comb algorithm is superior to those of the other two algorithms. We applied the J-comb algorithm to real observational data of the Orion A star-forming region. We successfully produced dust temperature and column density maps with ~10′′angular resolution, unveiling much greater details than the previous results. A py Thon code release of J-comb and implementation of the algorithm are available at https://***/Sihan jiao/J-comb.

关键词： star formation molecular clouds image processing

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改进暗通道原理下视觉图像光晕消除算法

现代电子技术 2025年第1期48卷 60-64页

作者：任晓楠李广中北大学山西太原030051

在光晕区域附近进行光晕消除操作可能会降低图像的对比度、清晰度和细节。因此,需要开发有效的方法来恢复和增强光晕消除后的图像细节,以确保整体图像质量的提高,为此设计一种改进暗通道原理下视觉图像光晕消除算法。建立大气散射模型... 详细信息

在光晕区域附近进行光晕消除操作可能会降低图像的对比度、清晰度和细节。因此,需要开发有效的方法来恢复和增强光晕消除后的图像细节,以确保整体图像质量的提高,为此设计一种改进暗通道原理下视觉图像光晕消除算法。建立大气散射模型深度分析光晕产生条件,根据图像中的像素强度值计算成像环境中的透射率,按照大气光照的散射系数建立光照条件研究模型。在较高的像素颜色通道条件下,根据图像中高亮度和强反射部分搭建无光晕图像亮通道定义,聚类图像亮通道特征,利用快速双边滤波器细化透射率,建立光晕图像的成像模型。在改进暗通道原理的过程中通过调整多个计算参数,包括改变权重函数,设置光晕消除的恢复指令,完成对视觉图像的光晕消除处理。经过实验分析可以证明,所提方法具备良好的光晕消除性能,光晕消除效果较好。

关键词：改进暗通道视觉图像光晕消除透射率多尺度算法大气散射模型

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因地制宜发展新质生产力的学理阐释

新疆师范大学学报（哲学社会科学版） 2025年第2期46卷 39-47页

作者：李传兵任平阳贵州大学长征文化研究院贵州贵阳550025 贵州大学中共党史党建研究院贵州贵阳550025 贵州大学马克思主义学院贵州贵阳550025 贵州大学哲学学院贵州贵阳550025

因地制宜发展新质生产力是我国经济发展领域的重要课题,科学合理发展新质生产力是推动经济持续增长和提升全民福祉的关键所在。文本在系统把握因地制宜中的“时”“业”“域”特点,深入挖掘因地制宜发展新质生产力理论内涵的基础上,从... 详细信息

因地制宜发展新质生产力是我国经济发展领域的重要课题,科学合理发展新质生产力是推动经济持续增长和提升全民福祉的关键所在。文本在系统把握因地制宜中的“时”“业”“域”特点,深入挖掘因地制宜发展新质生产力理论内涵的基础上,从马克思主义哲学角度与中国特色社会主义建设的具体实践角度探讨其生成依据,围绕制度、发展、主体、创新四个向度阐述因地制宜发展新质生产力的价值旨归。通过对立足地方实际、直面地方问题、汇聚地方力量和激发地方活力四个方面的实践探赜,重点揭示如何将因地制宜发展新质生产力理论转化为可落地的务实行动,推动新质生产力进一步发展。

关键词：新质生产力因地制宜高质量发展实事求是学理阐释