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Multicolor upconversion reversible modulations in YNbO_(4):Er^(3+)/Tm^(3+)/Yb^(3+) photochromic materials

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Journal of Rare Earths 2024年第2期42卷 270-277,I0002页

作者： Zhen Zhang Peng Li ziyi xu Zhihao Zhang Qiwei Zhang Haiqin Sun Xihong Hao Inner Mongolia Key Laboratory of Ferroelectric-related New Energy Materials and Devices Schoolof Materials and MetallurgyInner Mongolia University of Science and TechnologyBaotou014010China College of Physics and Technology Guangxi Normal UniversityGuilin541004China

Photochromic materials with multicolor upconversion reversible modulations are attractive in optical switching ***,the fabricated YNbO_(4):Er^(3+)/Tm^(3+)/Yb^(3+) materials exhibit excellent photochromism and multicolor upconversion properties from green,red to near infrared(NIR) emissions with increasing Yb *** multiband upconversion modulations are achieved by alternating light(365 and 405 nm) or thermal *** 365 nm irradiation,the luminescence color changes from yellow to red,the luminescent photoswitching contrast reaches up to 86.21%(green),82.12%(red) and 77.38%(NIR) in the Y_(0.83)Er_(0.01)Tm_(0.01)NbO_(4):0.15 Yb ***,the upconversion emission intensity before and after photochromic reaction shows remarkable change in a wide temperature range of 298-718 *** results indicate that the Er^(3+)/Tm^(3+)/Yb^(3+) tri-doped YNbO_(4) materials can be a good candidate in optical switching and data storage applications.

关键词： Photochromic materials Luminescence modulation Multicolor emission Photoswitching contrast Rare earths

基于质谱和光谱分析的同位素气体检测技术研究进展

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激光与光电子学进展 2024年第13期61卷 22-33页

作者：许子怡刘硕河北工业大学电子信息工程学院先进激光技术研究中心天津300401

气体同位素丰度检测在工业生产、生物医疗、地质勘测等方面均具有重要的研究价值,能够应用于工业安全在线监控、依据人体呼出气体实时临床无创诊断等方面。首先介绍同位素气体检测技术的应用价值和应用领域,证实同位素气体检测具有广阔... 详细信息

气体同位素丰度检测在工业生产、生物医疗、地质勘测等方面均具有重要的研究价值,能够应用于工业安全在线监控、依据人体呼出气体实时临床无创诊断等方面。首先介绍同位素气体检测技术的应用价值和应用领域,证实同位素气体检测具有广阔的应用前景。接着阐述了同位素丰度的内涵,然后从质谱分析技术和光谱分析技术两方面出发,介绍了质谱分析、光声光谱、可调谐半导体激光吸收光谱、腔衰荡光谱和腔增强吸收光谱检测技术这五种同位素丰度探测手段,分别阐释了不同检测技术的相关原理和近年来同位素气体检测的研究进展。通过对比五种同位素丰度检测技术的性能,分析得到各同位素气体检测技术的优缺点和适用场景,并提出未来同位素气体检测技术的研究展望。

关键词：同位素丰度检测质谱分析光声光谱可调谐半导体激光吸收光谱腔衰荡光谱腔增强吸收光谱

Temperature effect on nanotwinned Ni under nanoindentation using molecular dynamic simulation

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Chinese Physics B 2024年第1期33卷 603-612页

作者：何茜徐子翼倪玉山 Department of Aeronautics and Astronautics Fudan UniversityShanghai 200433China

Temperature effect on atomic deformation of nanotwinned Ni (nt-Ni) under localized nanoindentation is investigated in comparison with nanocrystalline Ni (nc-Ni) through molecular *** nt-Ni exhibits enhanced critical load and hardness compared to nc-Ni,where perfect,stair-rod and Shockley dislocations are activated at (111),(111) and (111) slip planes in nt-Ni compared to only SSockley dislocation nucleation at (111) and (111) slip planes of *** nt-Ni exhibits a less significant indentation size effect in comparison with nc-Ni due to the dislocation slips hindrance of the twin *** atomic deformation associated with the indentation size effect is investigated during dislocation *** from the decreasing partial slips parallel to the indenter surface in nc-Ni with increasing temperature,the temperaturedependent atomic deformation of nt-Ni is closely related to the twin boundary:from the partial slips parallel to the twin boundary (~10 K),to increased confined layer slips and decreased twin migration(300 K–600 K),to decreased confined layer slips and increased dislocation interaction of dislocation pinning and dissociation (900 K–1200 K).Dislocation density and atomic structure types through quantitative analysis are implemented to further reveal the above-mentioned dislocation motion and atomic structure *** study is helpful for understanding the temperature-dependent plasticity of twin boundary in nanotwinned materials.

关键词： nanoindentation twin boundary plastic deformation molecular dynamics simulation

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次临界Choquard方程的多解

数学物理学报（A辑） 2024年第1期44卷 60-79页

作者：温瑞江刘范琴徐子怡江西师范大学数学与统计学院南昌330022 首都师范大学数学科学学院北京100048 兰州大学数学与统计学院兰州730000

该文考虑次临界Choquard方程{-Δu+(λV(x)+1)u u∈H^(1)(R^(N)=(∫_(R^(N)|u(g)|Pc/|x-y|udy)|u|^(PC-2)u,x∈R^(N)(0.1)多解的存在性,其中N>3,λ是正实参数,p_(ε)=2_(μ)^(*)-ε,ε>0,0<μ 详细信息

该文考虑次临界Choquard方程{-Δu+(λV(x)+1)u u∈H^(1)(R^(N)=(∫_(R^(N)|u(g)|Pc/|x-y|udy)|u|^(PC-2)u,x∈R^(N)(0.1)多解的存在性,其中N>3,λ是正实参数,p_(ε)=2_(μ)^(*)-ε,ε>0,0<μ

关键词：次临界Choquard方程 Lusternik-Schnirelman定理解的多重性

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央企青年科技人才培养策略研究

当代石油石化 2024年第4期32卷 54-56页

作者：徐子懿中石化(北京)化工研究院有限公司北京100013

央企作为科技创新的国家队,在关系国计民生的重要行业和关键领域发挥着基础性作用。青年科技人才处于创新创造力的高峰期,是国家战略人才力量的重要组成部分。央企应把青年科技人才培养放在更加突出的位置,遵循科技创新规律和人才成长规... 详细信息

央企作为科技创新的国家队,在关系国计民生的重要行业和关键领域发挥着基础性作用。青年科技人才处于创新创造力的高峰期,是国家战略人才力量的重要组成部分。央企应把青年科技人才培养放在更加突出的位置,遵循科技创新规律和人才成长规律,对青年科技人才开展多渠道、多方式培养,为进一步推进中央企业创新发展、加快建设科技强国提供有力人才保障。

关键词：中央企业青年科技人才培养策略

猕猴桃OSCA基因家族鉴定及其在非生物胁迫下的表达分析

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果树学报 2024年第3期41卷 436-447页

作者：徐子怡罗晨宇占坤邱荣辉黄春辉徐小彪贾东峰江西农业大学农学院南昌330045 江西农业大学猕猴桃研究所南昌330045

【目的】揭示OSCA家族基因在猕猴桃响应非生物胁迫中的表达特征,为猕猴桃OSCA基因功能分析与猕猴桃抗逆性遗传改良提供参考。【方法】利用生物信息学方法对全基因组范围内猕猴桃OSCA基因家族成员进行鉴定和综合分析,通过qRT-PCR法分析... 详细信息

【目的】揭示OSCA家族基因在猕猴桃响应非生物胁迫中的表达特征,为猕猴桃OSCA基因功能分析与猕猴桃抗逆性遗传改良提供参考。【方法】利用生物信息学方法对全基因组范围内猕猴桃OSCA基因家族成员进行鉴定和综合分析,通过qRT-PCR法分析它们在不同非生物胁迫下的表达特征。【结果】在中华猕猴桃基因组中共鉴定出16个OSCA基因,它们不均等地分布于13条染色体上,其启动子区域存在大量响应逆境胁迫的顺式作用元件。OSCA3在干旱、盐、高温和低温胁迫下表达量均较显著上调,OSCA8在干旱、盐和低温胁迫下表达量显著上调,OSCA1和OSCA14在低温胁迫处理下表达量显著上调,OSCA7和OSCA15均显著响应干旱胁迫。【结论】鉴定出6个受非生物胁迫显著诱导表达的猕猴桃OSCA基因,为进一步研究OSCA基因在响应猕猴桃非生物胁迫中的分子功能提供了重要依据。

关键词：猕猴桃 OSCA基因家族非生物胁迫基因表达

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Performance analysis and flow mechanism of channel wing considering propeller slipstream

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Chinese Journal of Aeronautics 2023年第11期36卷 165-184页

作者： Xiaoxuan MENG ziyi xu Min CHANG Junqiang BAI School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China Unmanned System Research Institute Northwestern Polytechnical UniversityXi’an 710072China Shenzhen Research Institude of Northwestern Polytechnical University Shenzhen 518057China

The development of the Urban Air Mobility concept has proposed stringent requirements for the fixed-wing vehicle’s Short/Vertical Take-Off and Landing(S/VTOL)*** its lift-enhancing impact,the channel wing,can improve aircraft low-speed performance and Short Take-Off and Landing(STOL)*** is critical for the performance analysis and flow mechanism study of a channel wing that considers the influence of propeller slipstream to guide the design of S/VTOL *** law and mechanism for the effect of the enclosing angle of the arc wing,the phase angle of the propeller,the tip clearance,the rotational speed and the chordwise position of the propeller on the channel wing are explored utilizing the quasi-steady multi reference frame method.A channel wing with a larger enclosing angle has a better ability to enhance lift and reduce drag using propeller *** effect of propeller phase angle on channel wing aerodynamic forces is periodic and *** propeller rotational speed is helpful to enhance lift and resist flow separation for channel *** can reduce drag for tractor configuration but increase drag for pusher ***,the nose-down pitching moment of a channel wing will grow dramatically,making longitudinal trimming in aircraft layout design challenging.

关键词： Channel wing Computational fluid dynamics Flow interactions Mechanisms Slipstream effect

Strengthening poly(2-hydroxyethyl methacrylate) hydrogels using biochars and hydrophobic aggregations

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International Journal of Smart and Nano Materials 2022年第4期13卷 561-574页

作者： Ping Zhang ziyi xu Zhiying Wu Ping xu Canhui Yang Shenzhen Key Laboratory of Soft Mechanics&Smart Manufacturing Department of Mechanics and Aerospace EngineeringSouthern University of Science and TechnologyShenzhenP.R.China Department of Chemistry City University of Hong KongHong KongP.R.China Department of Respiratory and Critical Care Medicine Peking University Shenzhen HospitalShenzhenGuangdongP.R.China

As the first version of synthetic hydrogel,poly(2-hydroxyethyl methacrylate)hydrogels have found broad ***,their poor mechanical performances have been longstanding hurdles for practical ***,we report on strengthening the poly(2-hydroxyethyl methacrylate)hydro-gels with biochar nanoparticles and hydrophobic aggregations,which are induced by solvent exchange and reinforced by *** the vast anchoring points on the multifunc-tional surfaces of the biochar nanoparticles and the aggregates formed between poly(2-hydroxyethyl methacrylate)chains engender strong and dissipative physical *** result-ing hydrogels exhibit marked mechanical properties,encom-passing high stretchability~7,high fracture toughness~1360 J m−2,high elastic modulus~180 kPa,low friction coefficient~0.2,self-recovery,and ***,we demonstrate the versatility of the proposed strategy by using water/ionic liquid binary solvent as the sol-vent system,Laponite as the nano-reinforcement,and dryanneal as the hydrophobic aggregation enhancer to synthesize mechanically robust ***(2-hydroxyethyl methacry-late)hydrogels of superior mechanical properties are expected to enable previously inaccessible applications in biomedicine and engineering.

关键词： Hydrogel PHEMA mechanical properties biochar hydrophobic aggregation

小型堆二次侧非能动余热排出系统特性计算分析

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核技术 2024年第3期47卷 109-115页

作者：董博通肖瑶李俊龙徐子伊刘茂龙刘利民傅俊森顾汉洋上海交通大学智慧能源创新学院上海200240 上海交通大学机械与动力工程学院上海200240

为提高反应堆安全性,基于自然循环的非能动余热排出系统在小型反应堆中有着广泛的应用。本文基于已完成的小型一体化核动力装置中间回路换热实验,用RELAP5(Reactor Excursion and Leak Analysis Program)对中间回路自然循环运行特性开... 详细信息

为提高反应堆安全性,基于自然循环的非能动余热排出系统在小型反应堆中有着广泛的应用。本文基于已完成的小型一体化核动力装置中间回路换热实验,用RELAP5(Reactor Excursion and Leak Analysis Program)对中间回路自然循环运行特性开展了计算分析工作。研究发现,载热功率的程序计算结果与实验数据符合良好,可表征系统的自然循环特性。在余热排出系统中,系统回路的压力由蒸汽发生器(Steam Generator,SG)一次侧平均温度所决定,SG一次侧入口温度、质量流量与冷热源高度差对余热排出系统换热性能影响显著。当SG一次侧入口温度较高时,余热排出系统换热性能对系统回路阻力更加敏感,这些结果为进一步研究小型堆非能动系统提供了有价值的应用。

关键词：小型堆自然循环非能动余热排出系统 RELAP5