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Effect of Ti_(p) Content on the Work Hardening and Softening Behavior of Mg-Zn-Ca Alloy

Acta Metallurgica Sinica(English Letters) 2024年第3期37卷 551-560页

作者： Jin-Kai Zhang Cui-Ju Wang Yi-Dan Fan Chao Xu Kai-bo nie Kun-Kun Deng Shanxi Key Laboratory of Advanced Magnesium-Based Materials College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

The Ti_(p)/ZX60 composites with different Ti_(p) contents were prepared by semi-solid stirring *** extrusion,the microstructure,work hardening and softening behavior of the Ti_(p)/ZX60 composites were analyzed compared with the ZX60(Mg-6Zn-0.2Ca)*** results showed that the addition of Ti_(p) could not only promote the nucleation of dynamic recrystallized(DRXed)grains,but also be propitious to the refinement of DRXed *** increasing Ti_(p) content,the size of DRXed grains decreased accompanied with increasing volume fraction of DRXed *** the Ti_(p) content increased to 15 vol.%,the average size and volume fraction of DRXed grains reached to~0.32μm and 93.2%,***,both the strength and elongation were improved by the addition of Ti_(p).With increasing content of Ti_(p),a substantial increase in the strength was achieved with little change in the ***,the elongation decreased sharply when the Ti_(p) content further increased to 15 vol.%.The addition of Ti_(p) led to an increase in the work hardening rate,which gradually increased with increasing Ti_(p) ***,the softening rate did not demonstrate the same tendency with increasing Ti_(p) *** the conventional ceramic particles,the Ti_(p) can be deformed in coordination with the matrix alloy,which imparted a higher softening rate to the matrix *** though the softening rate improved as the Ti_(p) content increased from 5 to 10 vol.%,it dropped deeply as the Ti_(p) content increased to 15 vol.%owing to the fracture of Ti_(p) during extrusion.

关键词： Titanium particle content Particle reinforced magnesium matrix composites Work hardening Softening behavior Mechanical properties

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Mechanism of Qili Qiangxin Capsule for Heart Failure Based on miR133a-Endoplasmic Reticulum Stress

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Chinese Journal of Integrative Medicine 2024年第5期30卷 398-407页

作者： JI Xiao-di YANG Ding CUI Xi-yuan LOU Li-xia nie bo ZHAO Jiu-li ZHAO Ming-jing WU Ai-ming Dongzhimen Hospital Affiliated to Beijing University of Chinese Medicine Key Laboratory of Chinese Internal Medicine of Ministry of Education and BeijingBeijing 100700China Department of Traditional Chinese Medicine Fuwai HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100037China

Objective:To investigate the pharmacological mechanism of Qili Qiangxin Capsule(QLQX)improvement of heart failure(HF)based on miR133a-endoplasmic reticulum stress(ERS)***:A left coronary artery ligation-induced HF after myocardial infarction model was used in this *** were randomly assigned to the sham group,the model group,the QLQX group[0.32 g/(kg·d)],and the captopril group[2.25 mg/(kg·d)],15 rats per group,followed by 4 weeks of *** function such as left ventricular ejection fraction(EF),fractional shortening(FS),left ventricular systolic pressure(LVSP),left ventricular end diastolic pressure(LVEDP),the maximal rate of increase of left ventricular pressure(+dp/dt max),and the maximal rate of decrease of left ventricular pressure(–dp/dt max)were monitored by echocardiography and *** and eosin(HE)and Masson stainings were used to visualize pathological changes in myocardial *** m RNA expression of mi R133a,glucose-regulated protein78(GRP78),inositol-requiring enzyme 1(IRE1),activating transcription factor 6(ATF6),X-box binding protein1(XBP1),C/EBP homologous protein(CHOP)and Caspase 12 were detected by *** protein expression of GRP78,p-IRE1/IRE1ratio,cleaved-ATF6,XBP1-s(the spliced form of XBP1),CHOP and Caspase 12 were detected by Western *** T-mediated d UTP nick-end labeling(TUNEL)staining was used to detect the rate of ***:QLQX significantly improved cardiac function as evidenced by increased EF,FS,LVSP,+dp/dt max,-dp/dt max,and decreased LVEDP(P<0.05,P<0.01).HE staining showed that QLQX ameliorated cardiac pathologic damage to some *** staining indicated that QLQX significantly reduced collagen volume fraction in myocardial tissue(P<0.01).Results from RT-PCR and Western blot showed that QLQX significantly increased the expression of mi R133a and inhibited the m RNA expressions of GRP78,IRE1,ATF6 and XBP1,as well as decreased the protein expressions of GRP78,cleave

关键词： heart failure Qili Qiangxin Capsule miR133a endoplasmic reticulum stress apoptosis

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Benchmark experiment on slab^(238)U with D-T neutrons for validation of evaluated nuclear data

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Nuclear Science and Techniques 2024年第2期35卷 145-159页

作者： Yan-Yan Ding Yang-bo nie Yue Zhang Zhi-Jie Hu Qi Zhao Huan-Yu Zhang Kuo-Zhi Xu Shi-Yu Zhang Xin-Yi Pan Chang-Lin Lan Jie Ren Xi-Chao Ruan Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Institute of Fluid Physics China Academy of Engineering PhysicsMianyang 62100China

A benchmark experiment on^(238)U slab samples was conducted using a deuterium-tritium neutron source at the China Institute of Atomic *** leakage neutron spectra within energy levels of 0.8-16 MeV at 60°and 120°were measured using the time-of-flight *** samples were prepared as rectangular slabs with a 30 cm square base and thicknesses of 3,6,and 9 *** leakage neutron spectra were also calculated using the MCNP-4C program based on the latest evaluated files of^(238)U evaluated neutron data from CENDL-3.2,ENDF/B-Ⅷ.0,JENDL-5.0,and *** on the comparison,the deficiencies and improvements in^(238)U evaluated nuclear data were *** results showed the following.(1)The calculated results for CENDL-3.2 significantly overestimated the measurements in the energy interval of elastic scattering at 60°and 120°.(2)The calculated results of CENDL-3.2 overestimated the measurements in the energy interval of inelastic scattering at 120°.(3)The calculated results for CENDL-3.2 significantly overestimated the measurements in the 3-8.5 MeV energy interval at 60°and 120°.(4)The calculated results with JENDL-5.0 were generally consistent with the measurement results.

关键词： Leakage neutron spectra Uranium D-T neutron source Evaluated nuclear data

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考虑气动-结构的高空螺旋桨多学科优化方法

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航空动力学报 2024年第4期39卷 75-83页

作者：口启慧王海峰江泓鑫聂波西北工业大学航空学院西安710072

为实现高空螺旋桨高效率和轻质量之间的权衡设计,提出一种考虑螺旋桨气动-结构性能的多学科多目标优化设计方法,理论上可得到约束条件下推力最大和质量最小的Pareto解集。但工程应用中,变量太多,可接受时间内仅能获得Pareto解集拟合趋... 详细信息

为实现高空螺旋桨高效率和轻质量之间的权衡设计,提出一种考虑螺旋桨气动-结构性能的多学科多目标优化设计方法,理论上可得到约束条件下推力最大和质量最小的Pareto解集。但工程应用中,变量太多,可接受时间内仅能获得Pareto解集拟合趋势。为避免优化周期太长,提出以下阶段性优化方法。阶段1:根据上述Pareto解集拟合趋势和平台约束,确定最优桨径;阶段2:进行基于最优桨径的气动优化获得气动外形,结构优化获得结构方案。使用该方法对高空太阳能无人机螺旋桨优化,两个阶段耗时分别为96 h和4 h。对获得螺旋桨制造,仿真和试验,对比结果表明:推力最大误差为10.9%,质量误差为6.9%,刚度误差为15.2%,固有频率误差为15.4%,试验结果也表明该方法的合理有效性。

关键词：高空螺旋桨多学科优化 Pareto解集气动优化结构优化复合材料螺旋桨试验验证

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北京地区日光温室草莓栽培管理技术

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园艺与种苗 2024年第5期44卷 49-52页

作者：聂伯乐北京市长阳农场有限公司北京102445

北京市草莓产业作为都市农业的一个特色,已成为一二三产业融合的典范,对提升农业效益和农民收入起到了关键作用。该文深入分析了北京地区日光温室草莓的栽培现状,详细介绍了温室草莓的栽培设施、品种选择、温度湿度光照管理、植株管理... 详细信息

北京市草莓产业作为都市农业的一个特色,已成为一二三产业融合的典范,对提升农业效益和农民收入起到了关键作用。该文深入分析了北京地区日光温室草莓的栽培现状,详细介绍了温室草莓的栽培设施、品种选择、温度湿度光照管理、植株管理、水肥管理和病虫害管理等关键技术环节,并对温室草莓的收获技术和经济效益进行了探讨。通过综合运用先进的温室技术和科学的管理方法,有效提高草莓产量和品质。

关键词：北京地区日光温室草莓栽培管理技术

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酒钢4#高炉冷却壁破损原因分析及对策

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甘肃冶金 2024年第3期46卷 59-62页

作者：杨玉成聂波甘肃酒钢集团宏兴钢铁股份有限公司炼铁厂甘肃嘉峪关735100

酒钢4#高炉中修开炉运行仅1 a后出现炉腹、炉腰、炉身下部冷却壁大量破损,已影响到高炉的操作及生产稳定。结合4#高炉中修后的生产实际状况,并与3#高炉对比,分析冷却壁破损的原因,并提出相应对策,为缓解炉身冷却壁损坏改善高炉运行提供... 详细信息

酒钢4#高炉中修开炉运行仅1 a后出现炉腹、炉腰、炉身下部冷却壁大量破损,已影响到高炉的操作及生产稳定。结合4#高炉中修后的生产实际状况,并与3#高炉对比,分析冷却壁破损的原因,并提出相应对策,为缓解炉身冷却壁损坏改善高炉运行提供依据。

关键词：高炉操作炉型冷却壁破损煤气流分布

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SYNTHESIS AND CHARACTERIZATION OF WATER-SOLUBLE CdSe NANOPARTICLES CAPPED BY AOT

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Chinese Journal of Polymer Science 2013年第9期31卷 1284-1289页

作者： Yan-ming Chen Xiao-bo nie School of Petrochemical Engineering Shenyang University of Technology

Water-soluble CdSe nanoparticles were synthesized using AOT （sodium bis（2-ethylehexyl）-sulfosuccinate） as stabilizer, cadmium acetate and NazSeSO3 as precursors in aqueous phase. The influence of some key factors, such as reaction time, temperature, concentration and molar ratio of precursors on the optical properties of CdSe nanoparticles was systematically investigated through UV-Vis and PL spectra. Powder X-ray diffraction （XRD） was used to characterize the crystalline structure of synthesized CdSe nanoparticles. As-prepared CdSe nanoparticles exhibit an apparent quantum confinement effect and typical hexagonal wurtzite structures. Finally, the optimal experimental conditions were obtained.

关键词： AOT CdSe Nanoparticles Aqueous phase.

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Corrosion Resistance of AZ91 Mg Alloy Modified by High-Current Pulsed Electron Beam

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Acta Metallurgica Sinica(English Letters) 2019年第2期32卷 218-226页

作者： Peng-Peng Wu Kun-Kun Deng Kai-bo nie Zhong-Zhong Zhang Shanxi Key Laboratory of Advanced Magnesium-Based Materials College of Materials Science and EngineeringTaiyuan University of Technology

The high-current pulsed electron beam(HCPEB) treatment with current density 6 J/cm^2 was applied on AZ91 Mg alloy to improve its corrosion resistance. Results showed that the net-like Mg_(17)Al_(12) disappeared on the surface of AZ91 Mg alloy after irradiation by HCPEB, which was instead of supersaturated Al element on the surface. Nevertheless, the application of HCPEB also led to the formation of crater-like and groove-like structures as well as micro-cracks on the surface of AZ91 Mg alloy. After HCPEB treatment by 3, 5 and 10 pulses, the AZ91 Mg alloy exhibited better corrosion ***, the increasing amount of micro-cracks reduced the anti-corrosive properties of AZ91 Mg alloy as the pulse increased to 20 and 30.

关键词： High-current pulsed electron beam(HCPEB) Corrosion resistance Electrochemical impedance spectroscopy(EIS) AZ91 Mg alloy Microstructure

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Efficient synthesis of 5,6-dihydrothieno[3′,2′:4,5]-thieno[2,3-d]pyrimidin-4(3H)-ones via an iminophosphorane

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Chinese Chemical Letters 2009年第9期20卷 1055-1058页

作者： Yu Lu Chen Yi bo nie Ming Wu Ding Key Laboratory of Pesticide & Chemical Biology of Ministry of Education Central China Normal University Wuhan 430079 China Department of Biology Xianning Vocational and Technical College Xianning 437100 China

5,6-Dihydrothieno[3＇,2＇：4,5]thieno[2,3-d]pyrimidin-4（3H）-ones 6 were synthesized in yields of 71-87% by a consecutive method, which includes aza-Wittig reaction of iminophosphorane 3 with aromatic isocynate to give carbodiimide 4 and subsequent reaction of 4 with various amines, phenols or alcohols in the presence of catalytic amount of sodium ethoxide or solid potassium carbonate. 2009 Ming Wu Ding. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： 5,6-Dihydrothieno[3r,2':4,5]thieno[2,3-d]pyrimidin-4(3//)-one Iminophosphorane Aza-Wittig reaction Carbodiimide Isocyanate

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Recent Research on the Deformation Behavior of Particle Reinforced Magnesium Matrix Composite: A Review

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Acta Metallurgica Sinica(English Letters) 2019年第4期32卷 413-425页

作者： Kun-Kun Deng Cui-Ju Wang Kai-bo nie Xiao-Jun Wang Shanxi Key Laboratory of Advanced Magnesium-Based Materials College of Materials Science and Engineering Taiyuan University of Technology School of Materials Science and Engineering Harbin Institute of Technology

Particle reinforced magnesium matrix composite(PMMC) possesses the merits of high specific strength, high specific modulus, better dimensional stability, good wear resistance and lower production cost, which is thought as a promising material in the field of aerospace, automobile, electronic communication, etc. To eliminate the casting defect, the PMMC is usually experienced hot deformation process. The present paper mainly focuses on the deformation behavior of PMMCs. First, the development of PMMCs based on particle size is introduced. Then, the hot deformation technology and deformation mechanism of PMMCs at elevated temperature are given and analyzed, respectively. After reviewing the dynamic recrystallization and texture of PMMCs, its future development is suggested based on the current research progress.

关键词： Magnesium matrix composite Particle Hot deformation Deformation mechanism Recrystallization

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