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Amino acid assisted aqueous synthesis of highly stable CsPbBr_(3)nanocrystals for cell imaging

Nano Research 2025年第1期18卷 675-683页

作者： Xue Li Yanan Guo Guoying Tan qingyi liu Nan Song Yu Tang State Key Laboratory of Applied Organic Chemistry Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu ProvinceCollege of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030China

Lead halide perovskite nanocrystals(NCs)exhibit excellent optoelectronic performance and have drawn great interests in the fields of biological imaging and ***,the poor stability of CsPbX_(3)(X=Cl,Br,I)in water is still a challenge to hinder their practical *** this work,a facile strategy has been developed for aqueous synthesis of CsPbX_(3) nanocrystals,in which L-glutamic acid(LGlu)has been used to replace oleic acid in the synthetic *** from the synergic effects of L-Glu and oleylamine(OAm),CsPbBr_(3)nanocrystals(L-Glu/OAm-CsPbBr_(3)NCs)with high water stability have been directly prepared under a mild condition at room temperature in water,facilitated by the process of crystal phase transformation from Cs_(4)PbBr_(6) to CsPbBr_(3).L-Glu/OAm-CsPbBr_(3)NCs exhibit a high quantum yield of 85%and a narrow full width at half maximum of 16 nm,demonstrating their efficient luminescence in ***,L-Glu on the surface have contributed greatly to an acidic environment and passivation of surface defects,improving the water stability and dispersibility of CsPbBr_(3)***,L-Glu/OAm-CsPbBr_(3)NCs exhibit great biocompatibility due to the presence of L-Glu,resulting in their good performance for HeLa cell ***,we propose a facile and effective method to prepare CsPbBr_(3)nanocrystals with excellent water stability by using L-Glu and OAm as cooperated ligands and expand their application in cell imaging.

关键词： aqueous synthesis cell imaging lead halide perovskite nanocrystals L-glutamic acid phase transformation

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Isentropic Analysis of Regional Cold Events over Northern China

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Advances in Atmospheric Sciences 2020年第7期37卷 718-734页

作者： qingyi liu Qian liu Guixing CHEN School of Atmospheric Sciences and Guangdong Province Key Laboratory for Climate Change and Natural Disaster StudiesSun Yat-sen Universityand Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China

From the perspective of cold air mass(CAM)analysis,we examine the characteristics and mechanisms of regional cold events(RCEs)over northwestern and northeastern China in the past 58 years(1958/59-2015/16).The RCEs in northwestern(northeastern)China are shown to have an average duration of 6.8(4.7)days with a moderate(sharp)temperature *** quantitatively estimate the RCE-related CAM,for the first time,using an isentropic analysis *** an RCE in northwestern China,CAM is accumulated in western Siberia with convergent CAM flux under a blocking pattern in the Urals *** RCE outbreak,CAM penetrates the valleys of the Tianshan-Altay Mountains to the Tarim Basin and Hexi *** CAM moves slowly because of the blocking pattern and orographic effect,which explains the relatively long duration of ***,during RCEs in northeastern China,the CAM depth anomaly originates more to the east and quickly passes the Mongolian Plateau guided by an eastward-moving *** analyses further show that adiabatic processes play a crucial role in regulating the local change of CAM depth during the two kinds of *** advection term of adiabatic processes mainly increases the CAM depth during RCE outbreak,while the convergence term increases(reduces)CAM depth before(after)RCE *** terms are relatively strong during RCEs in northeastern China,resulting in the rate of change in CAM depth being^50%larger than for those in northwestern ***,the variations of RCEs in duration and intensity can be well explained by the different evolution of CAM depth and flux.

关键词： China. northwestern northeastern

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Tribological properties of CrN coating deposited on 20CrMo against tin bronze

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Science China(Technological Sciences) 2018年第11期61卷 1713-1722页

作者： liu JiLiang LIAO RiDong XIE GuoXin XIANG JianHua LUO Jun LIAO Bin liu qingyi School of Mechanical Engineering Beijing Institute of TechnologyBeiiing 100081China Beijing Liang Xin Technology Co. Ltd.Beijing 100081China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Beijing Radiation Center Beijing 100875China College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875China State Key Laboratory of Engine Reliability Weichai Power Co.Ltd.Weifang 261001China

A CrN coating was deposited on the piston pin material 20CrMo. The tribological properties of 20CrMo and CrN coating against tin bronze QSn7-0.2 were compared by pin-on-disk tests under dry friction and oil lubrication, respectively. The cross-sectional morphologies and structures of the coating were characterized through scanning electron microscopy and X-ray diffraction. The hardness, elastic modulus, and adhesion strength of the coating were tested through nano-hardness and scratch tests. The wear tracks were tested with an optical profilometer, and wear volume was calculated. Under dry friction conditions, the CrN coating exhibited a significantly stable friction coefficient and a relatively lower wear rate against QSn7-0.2 at various temperatures compared with 20CrMo. The wear rate decreased by 98.5% at 700°C. Under poly-alpha-olefine lubrication, the CrN coating reduced the load effect on the friction coefficient. Under engine oil 5 W40 lubrication, the CrN coating improved the tribological properties under high speed and heavy load conditions. Simultaneously, the CrN coating changed the friction and heat flow with increasing temperature.

关键词： CrN coating tribological properties piston pin friction coefficient wear rate

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Clinical Analysis of 15 Patients with Adult-Type Pulmonary Blastoma

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Chinese Journal of Clinical Oncology 2008年第5期5卷 379-382页

作者： Lei Wang qingyi liu Ming He Xianli Meng Yuekao Li Yumin Ping Yanning Chen The Second Department of Thoracic Surgery the Fourth Hospital of Hebei Medical University Shijiazhuang 050011 Hebei Province China The Second Department of CT Room the Fourth Hospital of Hebei Medical University Shijiazhuang 050011 Hebei Province China The Second Department of Pathology Department the Fourth Hospital of Hebei Medical University Shijiazhuang 050011 Hebei Province China

OBJECTIVE To study the clinical and histopathological characteristics of pulmonary blastoma(PB),and to review the diagnostic criterion and treatment *** Clinical and histopathological data from 15 cases of PB in this hospital,from 1990 to 2006,were retrospectively *** Surgical procedures were conducted in all 15 patients,including pulmonary lobectomy in 9,lobectomy of the 2 right pulmonary lobes in 2,excision of pulmonary segments in 1,lobectomy and bronchoplasty in 1,lobectomy and angioplasty in 1,and excision of the whole left lung in *** the 15 cases,11 were misdiagnosed as lung cancer,2 were doubted to be a benign tumor before surgery,1 was suspected to be a malignant mesenchymoma,and only 1 was diagnosed as a *** Preoperative final diagnosis of PB is very difficult,since the clinical symptoms of the disease are *** confirm the diagnosis,comprehensive consideration of the factors,such as the clinical manifestations,morphological characteristics and immunohistochemical tumor markers,should be *** is the treatment of choice for PB,and a thorough removal is the key to a *** has a high malignancy and o en recurs and metastasizes,usually with a poor prognosis.

关键词： pulmonary blastoma adult type diagnosis therapy.

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钠离子电池的储能机制与性能提升策略

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储能科学与技术 2024年第6期13卷 1871-1873页

作者：刘青宜许昌职业技术学院河南许昌461000

钠离子电池因丰富的原材料储量、低廉可控的成本和生产线转换优势而在储能方面有广阔前景。钠离子电池通过电能和化学能的相互转化完成充放电,电池单体的材料性能和制备技术需符合储能发展要求。目前,开发高能量密度、低成本、高安全性... 详细信息

钠离子电池因丰富的原材料储量、低廉可控的成本和生产线转换优势而在储能方面有广阔前景。钠离子电池通过电能和化学能的相互转化完成充放电,电池单体的材料性能和制备技术需符合储能发展要求。目前,开发高能量密度、低成本、高安全性为一体的储能系统是新型储能建设重点。本文从钠离子电池储能机制入手,分析钠离子电池的正极、负极、电解质、隔膜等部件的作用机理,整理前沿相关研究和应用进展,提出电池储能性能提升方法,旨在优化钠离子电池储能应用的技术路线,积累电化学储能领域的全新经验。

关键词：电化学储能钠离子电池储能机制失效分析

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Observer-based distributed event-triggered control of Markov linear system over saturation sensor network

Observer-based distributed event-triggered control of Markov...

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第三十九届中国控制会议

作者： Qing Li qingyi liu Yushun Tan School of Applied Mathematics Nanjing University of Finance and Economics School of Automation Southeast University

Under the consideration of distributed adaptive event-triggered communication scheme and cyber-attacks, the paper focuses the observer-based H∞ control issue for Markov jump linear systems over stochastic saturation sensor networks. To describe physical systems with abrupt variations, the system parameters and the network structure composed of a group of sensor nodes are modeled by Markovian switching topologies. A distributed adaptive event-triggered mechanism is designed to reduce the occupancy of the limited network resources. Based on randomly occurring cyber-attacks, a novel observer collected coupled transmission signals from multi-channel is first proposed to estimate unavailable state variables and exploited in the feedback protocol. Furthermore, a sufficient condition is derived to guarantee the stability of the built model with a prescribed performance index. Simultaneously, a co-design method for observer and controller gain matrices is proposed. Finally, the effectiveness of the model is illustrated by a numerical simulation example.

关键词： sensor networks distributed adaptive event-triggered scheme Markov systems saturation cyber-attacks

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距离审美中的戏剧化人生——张爱玲散文的别一种读法

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南京师范大学文学院学报 2013年第2期 29-33页

作者：刘青怡南京师范大学文学院江苏南京210097

张爱玲在散文创作中,以隐匿和游离的姿态对人生采取了一种距离审美的观照方式。这种距离审美的观照方式衍生出以反讽和消解为显著特征的戏剧化视角与思维方式,并在经意与不经意间运用了与之相应的戏剧化手段与表现策略,从而与20世纪西... 详细信息

张爱玲在散文创作中,以隐匿和游离的姿态对人生采取了一种距离审美的观照方式。这种距离审美的观照方式衍生出以反讽和消解为显著特征的戏剧化视角与思维方式,并在经意与不经意间运用了与之相应的戏剧化手段与表现策略,从而与20世纪西方现代主义诗学形成某种惊人的暗合,成为中国现代散文中一道独特而又超前的奇诡风景。

关键词：张爱玲散文距离审美戏剧化

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新型有源箝位ZVS单级PFC变换器

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电力自动化设备 2011年第2期31卷 62-67页

作者：刘青移王大庆贲洪奇哈尔滨工业大学电气工程系黑龙江哈尔滨150001

针对传统功率因数校正(PFC)变换器存在的开关管电压应力高、硬性开通等问题,提出一种新型单级PFC变换器,在传统Boost升压电路基础上,结合移相全桥及有源箝位技术,利用一级电路就可实现PFC以及DC/DC变换。通过在桥臂两端并联有源箝位电... 详细信息

针对传统功率因数校正(PFC)变换器存在的开关管电压应力高、硬性开通等问题,提出一种新型单级PFC变换器,在传统Boost升压电路基础上,结合移相全桥及有源箝位技术,利用一级电路就可实现PFC以及DC/DC变换。通过在桥臂两端并联有源箝位电路并结合适当的控制策略,吸收了变压器漏感在电路换流过程中产生的电压尖峰,降低了桥臂开关管的电压应力;利用变压器漏感与开关管寄生电容之间的谐振,使桥臂开关管和箝位开关管均实现零电压开关。在分析变换器工作原理的基础上,得到开关管零电压开关实现条件。实验结果表明,该变换器能够实现近似单位功率因数,开关管电压应力小且实现了零电压开关。

关键词：功率因数校正单级有源箝位移相全桥零电压开通

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“有为政府+有效市场”推进职业教育高质量发展探析

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教育与职业 2024年第18期1066卷 28-34页

作者：刘青宜徐晔许昌职业技术学院河南许昌461000 教育部课程教材研究所北京121000

职业教育发展中政府和市场的关系演变路径表明,职业教育的高质量发展既离不开政府的支持,也需要市场发挥作用。随着现代职业教育体系建设改革进入新阶段,政府主导模式已经不适应职业教育高质量发展要求,必须由“政府主导”模式向“有为... 详细信息

职业教育发展中政府和市场的关系演变路径表明,职业教育的高质量发展既离不开政府的支持,也需要市场发挥作用。随着现代职业教育体系建设改革进入新阶段,政府主导模式已经不适应职业教育高质量发展要求,必须由“政府主导”模式向“有为政府+有效市场”模式转变,共同推动职业教育高质量发展行稳致远。

关键词：职业教育有效治理有效市场有为政府

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多孔二氧化钛强化的相变材料储热机理研究

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化工学报 2024年第2期75卷 706-714页

作者：刘昌会肖桐刘庆祎耿龙赵佳腾中国矿业大学低碳能源与动力工程学院江苏徐州221116

相变材料在热能存储技术中的应用往往受到形状不稳定、低导热等限制。基于钛酸四丁酯的水解反应,通过一步法原位合成了基于二氧化钛的新型定型相变材料。相变材料的定型过程无须任何固化剂和有机溶剂,且无任何污染排放。此外,定型相变... 详细信息

相变材料在热能存储技术中的应用往往受到形状不稳定、低导热等限制。基于钛酸四丁酯的水解反应,通过一步法原位合成了基于二氧化钛的新型定型相变材料。相变材料的定型过程无须任何固化剂和有机溶剂,且无任何污染排放。此外,定型相变材料表现出理想的形状稳定性和防泄漏性能,并具有较高潜热(115 J/g)。进一步研究发现未完全干燥的样品(SP)出现异常的双峰相变行为。以干燥时间为变量,通过对SP进行质量损失测试、组分分析等研究后发现,SP中残留的非石蜡液相物质和二氧化钛的协同效应促进了(110+111)晶体结构的生长,从而增大了结晶过程中石蜡的平均晶面间距,进一步导致被封装的石蜡结晶过程中(110+111)晶面与020晶面比例失衡,最终在差示扫描量热法(DSC)曲线中出现异常的双峰相变现象。

关键词：石蜡相变结晶再生能源可持续性

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