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Laser lift-off technique and the re-utilization of GaN-based LED films grown on sapphire substrate

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Optoelectronics Letters 2008年第5期4卷 354-357页

作者： HUANG Jin zheng qing-hong liu Bao-lin Department of Physics Xiamen University Xiamen 361005 China.

A thin GaN LED film, grown on 2-inch-diameter sapphire substrates, is separated by laser lift-off. Atom force microscopy （AFM） and the double-crystal X-ray diffraction （XRD） have been employed to characterize the performance of Gan before and after the lift-off process. It is demonstrated that the separation and transfer processes do not alter the crystal quality of the GaN films obviously. InGaN/GaN multi-quantum-wells （MQW＇s） structure is grown on the separated sapphire substrate later and is compared with that grown on the conventional substmte under the same condition by using PL and XRD spectrum.

关键词：激光器离地升空技术 GaN LED薄膜晶体质量

A Minimum Residual Based Gradient Iterative Method for a Class of Matrix Equations

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Acta Mathematicae Applicatae Sinica 2024年第1期40卷 17-34页

作者： qing-qing zheng Department of Mathematics College of ScienceChina University of Petroleum-BeijingBeijing102249China

In this paper, we present a minimum residual based gradient iterative method for solving a class of matrix equations including Sylvester matrix equations and general coupled matrix equations. The iterative method uses a negative gradient as steepest direction and seeks for an optimal step size to minimize the residual norm of next iterate. It is shown that the iterative sequence converges unconditionally to the exact solution for any initial guess and that the norm of the residual matrix and error matrix decrease monotonically. Numerical tests are presented to show the efficiency of the proposed method and confirm the theoretical results.

关键词： Sylvester matrix equation coupled matrix equation minimum residual gradient descent convergence analysis

Application of EBSP in crystal slip analysis of rolled Al single crystals

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电子显微学报 2002年第5期21卷 709-710页

作者： LI zheng jie, liu qing (Department of materials science and engineering, Tsinghua University, Beijing 100084) Department of Materials science and engineering Tsinghua University 北京 100084

Microstructure and local crystallography of rolled Al crystals were investigated by the electron backscattered pattern (EBSP) technique. A crystal slip analysis was proposed based on the experimental results and Frank... 详细信息

关键词： EBSP Al 轧制铝材单晶体滑移系电子背散射谱

轻型急性缺血性脑卒中静脉阿替普酶溶栓治疗效果分析

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农垦医学 2024年第3期46卷 193-197页

作者：郑清柳乐灵颖徐志鸿刘雄蔺际龑刘昌云厦门大学附属第一医院急诊科福建厦门361000 四川大学华西医院厦门医院神经内科福建厦门361000 福建医科大学附属协和医院神经内科福州350000

目的:探讨轻型缺血性脑卒中在溶栓时间窗内进行静脉阿替普酶溶栓治疗的有效性、安全性及溶栓后远期预后的影响因素。方法:采用回顾性研究,选取2019年09月至2022年09月就诊于厦门大学附属第一医院的MIS患者,并符合静脉rt-PA溶栓治疗的适... 详细信息

目的:探讨轻型缺血性脑卒中在溶栓时间窗内进行静脉阿替普酶溶栓治疗的有效性、安全性及溶栓后远期预后的影响因素。方法:采用回顾性研究,选取2019年09月至2022年09月就诊于厦门大学附属第一医院的MIS患者,并符合静脉rt-PA溶栓治疗的适应症及排除禁忌症,观察每位患者静脉溶栓治疗前、给药结束后、24h、7d和14d的NIHSS变化及入院时和90d的mRS评分,同时观察记录神经功能缺损恶化、溶栓后全身出血等并发症发生率,并探讨MIS患者溶栓远期预后的影响因素。结果:静脉溶栓治疗前、后NIHSS得分比较差异有统计学意义(P<0.05),溶栓后出血并发症发生率为6.32%;到观察终点,共有166例患者具有良好的远期预后(mRS 0-1分),与发病前相比,其差异有统计学意义(P<0.05);二元Logistic回归发现,影响MIS静脉rt-PA溶栓治疗远期预后主要与发病前NIHSS评分及发病类型为心源性栓塞相关(P<0.05),而与发病前是否致残无明显相关。结论:MIS患者4.5h内实施静脉rt-PA溶栓治疗可能改善远期预后;就诊时NIHSS评分越高,其溶栓后远期预后可能越差;心源性栓塞可能是影响MIS患者溶栓远期预后的独立危险因素。

关键词：轻型缺血性脑卒中溶栓时间窗阿替普酶

Recent progresses of exosome-liposome fusions in drug delivery

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Chinese Chemical Letters 2024年第2期35卷 107-117页

作者： Lulu zheng Bo Hu Deyao Zhao Wenjing liu qing liu Yuanyu Huang Shaobo Ruan School of Life Science Advanced Research Institute of Multidisciplinary ScienceSchool of Medical TechnologyKey Laboratory of Molecular Medicine and BiotherapyKey Laboratory of Medical Molecule Science and Pharmaceutics EngineeringBeijing Institute of TechnologyBeijing 100081China Department of Radiation Oncology The First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450000China Beijing Key Laboratory of Drug Resistance Tuberculosis Research Beijing Tuberculosis and Thoracic Tumor Research Instituteand Beijing Chest HospitalCapital Medical UniversityBeijing 101149China

Exosomes are membrane-bound nanoscale extracellular vesicles,which produced by almost all *** to the excellent biocompatibility,long circulation time as well as low immunogenicity,exosomes as naturally-derived drug delivery carriers have experienced explosive growth over the past ***,issues such as insufficient loading efficiency,heterogeneous delivery efficiency,uncontrollable targeting ability,and low production limit their wide ***,the emerging exosome-liposome fusion strategy has become a potential approach to solve such ***,this review mainly focuses on the currently developed exosome-liposome fusion strategy and their application in drug delivery as well as disease *** review aims to shed light on the advantages of fusion strategy in drug delivery and provides a better understanding for more rational *** current challenge and future perspective regarding their clinical translation and application will also be discussed.

关键词： Exosome Liposome Membrane fusion Drug delivery Disease treatment

One-step construction of strongly coupled Co_(3)V_(2)O_(8)/Co_(3)O_(4)/MXene heterostructure via in-situ Co-F bonds for high performance all-solid-state asymmetric supercapacitors

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Rare Metals 2024年第2期43卷 682-691页

作者： Ji Zhou Bin-Bin liu Hu zheng Wen-qing Ma Qian Li Cai-Xia Xu Institute for Advanced Interdisciplinary Research(iAIR) Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of ShandongSchool of Chemistry and Chemical EngineeringUniversity of JinanJinan250022China

Co_(3)V_(2)O_(8)/Co_(3)O_(4)/Ti_(3)C_(2)T_(x) composite was easily synthesized via one-step succinct-operated hydrothermal *** interconnected Co_(3)V_(2)O_(8)/Co_(3)O_(4) nanowires network can in-situ grow and anchor on the surface of Ti_(3)C_(2)T_(x) via the strong Co-F bonds and contribute tremendously to depress Ti_(3)C_(2)T_(x) *** from the synergistically interplayed effect among the multiple interfaces and high conductivity of Ti_(3)C_(2)T_(x) as well as outstanding stability of the as-designed nanostructure,the optimum Co_(3)V_(2)O_(8)/Co_(3)O_(4)/Ti_(3)C_(2)T_(x)electrode reaches a commendable specific capacitance(up to 3800 mF·cm^(−2)),great rate capability(80%capacitance retention after 20-times current increasing),and preeminent cycling stability(95.4%/85.5%retention at 7000th/20,000th cycle).Moreover,the all-solid-state asymmetric supercapacitor based on Co_(3)V_(2)O_(8)/Co_(3)O_(4)/Ti_(3)C_(2)T_(x) and active carbon can deliver a high energy density of 84.0μWh·cm^(−2) at the power energy of 3.2 mW·cm^(−2),and excellent cycling durability with 87.0%of initial capacitance retention upon 20,000 *** work provides a practicable pathway to tailor MXene-based composites for high-performance supercapacitor.

关键词： Ti_(3)C_(2)T_(x) Co_(3)V_(2)O_(8)/Co_(3)O_(4) Heterostructure Cathode Supercapacitor

O_(2) adsorption on Fe_(3)O_(4) (110) surface and effect of gangue element Al doping: combined study of binding experiment and ab initio molecular dynamics

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Journal of Iron and Steel Research International 2024年第4期31卷 810-827页

作者： zheng-jian liu Hui-qing Jiang Yao-zu Wang Jian-liang Zhang Hong-mei Qiao An-yang zheng Fang-yu Guo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Intelligence Science and Technology University of Science and Technology BeijingBeijing 100083China Beijing Shougang Co. Ltd.Qian'an 064404HebeiChina Department of Physics National University of Defense TechnologyChangsha 410128HunanChina

At high temperature,the chemical reaction mechanism at the interface of magnetite and the influence mechanism of gangue element Al on the oxidation performance of magnetite are not *** addition,due to the limitation of existing experimental equipment,it is difficult to clarify the interface reaction mechanism in the oxidation process and the influence mechanism of Al on the surface oxidation reaction of Fe_(3)O_(4) at an atomic scale at high *** surface oxidation reaction mechanism of magnetite and the influence mechanism of Al on the oxidation of magnetite were studied by experiments and AIMD(ab initio molecular dynamics).The experimental results show that the existence of Al_(2)O_(3) will reduce the initial oxidation temperature and comprehensive oxidation performance of *** AIMD results show that aluminum can accelerate the interface reaction rate of Fe_(3)O_(4) in the high-temperature oxidation atmosphere,but the strong Al-O binding ability is not conducive to the transfer of O atoms in the oxidation process.

关键词： Ironmaking Magnetite oxidation Interface reaction Adsorption-Gangue aluminum AIMD

Comparative study on interaction between rare earth oxide refractories and rare earth treated steel

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Journal of Iron and Steel Research International 2024年第6期31卷 1493-1501页

作者： Ze Meng Guang-qiang Li Cheng Yuan Yi-jiang Zhao qing zheng Bin Zeng Yu liu The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan430081HubeiChina Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking Wuhan University of Science and TechnologyWuhan430081HubeiChina Technical Center Lianyuan Iron and Steel Co.Ltd.Loudi417009HunanChina

Refractories have an important effect on the cleanliness of molten *** interaction between CeAlO_(3) refractories and Ce treated steel was explored and compared with that between Al_(2)O_(3) refractories and Ce treated *** results show that the Ce content in steel decreases sharply after contact with Al_(2)O_(3) refractories and the pick-up of dissolved Al *** with the test of Al_(2)O_(3) refractories,the loss of Ce content is less in the test of CeAlO_(3) refractory,and the total oxygen content and dissolved Al content in steel increase *** dense and continuous Ce_(2)O_(2)S interface layer is observed at the CeAlO_(3) refractories/steel interface,which can serve as the metallurgical isolation layer and hinder the further interaction between refractories and ***,the higher steel cleanliness and less penetration of refractories by molten steel are obtained in the test of CeAlO_(3) *** CeAlO_(3) refractories show a promising prospect in the production of clean Ce treated steel.

关键词： CeAlO_(3)refractory Steel Cleanliness Interaction Rare earth

Distinct phosphorylation optimizes pathogen-induced PA and ROs bursts

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Molecular Plant 2024年第4期17卷 525-527页

作者： Kaihuai Lil Ruize Zhang Yong Wang Fengquan liu zheng qing Fu Department of Plant Pathology College of AgricultureGuizhou UniversityGuiyang 550025China Department of Biological Sciences University of South CarolinaColumbiaSC29208USA Institute of Plant Protection Jiangsu Academy of Agricultural SciencesNanjingJiangsu 210014China

Phospholipids hold a multifaceted function in cellular *** primary function of phospholipids is to serve as essential building blocks of cell membranes,which gives cells crucial structural support and facilitates cellular *** that,phospholipids also act as key signaling molecules that coordinate vital cellular processes such as organismal development,homeostasis,and adaptation to environmental *** being the smallest and simplest phospholipid,phosphatidic acid(PA)plays a crucial role as a metabolic intermediate and second messenger.

关键词： homeostasis lipids smallest