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位移电流测试方法的改进及应用

物理与工程 2024年第1期34卷 30-34,66页

作者：纪文宇张汉壮吉林大学物理学院吉林长春130012

自从麦克斯韦第一次提出位移电流这一概念之后,其在薄膜表征中便得到广泛的应用。然而,在课堂教学中,极少涉及位移电流的测试原理及相关应用讲解,更缺少对其实际应用的介绍。本文从位移电流的测试原理出发,联系实际应用,提出了基于周期... 详细信息

自从麦克斯韦第一次提出位移电流这一概念之后,其在薄膜表征中便得到广泛的应用。然而,在课堂教学中,极少涉及位移电流的测试原理及相关应用讲解,更缺少对其实际应用的介绍。本文从位移电流的测试原理出发,联系实际应用,提出了基于周期性阶跃电压驱动的电流测量(CPSIV)的新方法。这将有效地加深学生对于位移电流物理本质的深入理解。同时,我们以量子点发光二极管(QLED)为平台,对这一新的测试方案进行了实验验证。针对其中空穴传输层薄膜的缺陷特性及其对器件性能的影响进行了表征,揭示了器件的发光开启机制,证实了我们方案的可靠性。

关键词：麦克斯韦方程位移电流周期性阶跃电压长寿命缺陷态量子点发光二极管

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水泥基材料用原位增韧材料研究现状

混凝土 2024年第7期 19-27页

作者：王月俞佩瑶安明喆李良顺季文玉北京交通大学土木建筑工程学院北京100044

原位增韧材料可以从微纳观层次改善水泥水化产物的特性以及水泥基材料的微观结构,从而提升水泥基材料的韧性。通过整理国内外学者关于原位增韧材料增强水泥基材料宏观性能的研究,比较了纳米材料、聚合物材料和功能性微晶这三类增韧材料... 详细信息

原位增韧材料可以从微纳观层次改善水泥水化产物的特性以及水泥基材料的微观结构,从而提升水泥基材料的韧性。通过整理国内外学者关于原位增韧材料增强水泥基材料宏观性能的研究,比较了纳米材料、聚合物材料和功能性微晶这三类增韧材料对水泥基材料力学性能的影响,包括抗压强度、抗折强度、劈裂抗拉强度以及韧性。此外,分别从水化产物特性、水化产物微结构以及界面过渡区这三个方面出发,对原位增韧材料增强水泥基材料韧性的机理进行了系统地阐述。为后续水泥基材料用原位增韧材料的研发和混凝土韧性提升提供参考。

关键词：韧性纳米材料聚合物功能性微晶拉压比折压比

靶向EGFRvⅢ的CAR-NK细胞对胶质瘤细胞杀伤作用的体外实验研究

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中华神经外科杂志 2024年第8期40卷 841-847页

作者：陈举林依日扎提·艾力秦虎吉文玉郑伊桐汪永新新疆医科大学第一附属医院神经外科乌鲁木齐830000 神经肿瘤精准诊断与临床转化重点实验室乌鲁木齐830000

目的探索靶向表皮生长因子受体Ⅲ型突变体(EGFRvⅢ)的嵌合抗原受体(CAR)修饰的人外周血来源自然杀伤(NK)细胞在脑胶质瘤细胞中的杀伤作用。方法通过Ficoll密度梯度离心法获得人外周血来源的NK细胞并进行体外扩增培养,并通过慢病毒感染... 详细信息

目的探索靶向表皮生长因子受体Ⅲ型突变体(EGFRvⅢ)的嵌合抗原受体(CAR)修饰的人外周血来源自然杀伤(NK)细胞在脑胶质瘤细胞中的杀伤作用。方法通过Ficoll密度梯度离心法获得人外周血来源的NK细胞并进行体外扩增培养,并通过慢病毒感染构建靶向EGFRvⅢ的CAR-NK细胞及U87-EGFRvⅢ稳转细胞株。根据不同效应细胞作用于不同靶细胞而将实验组分为NK+U87组、NK+U87-EGFRvⅢ组、CAR-NK+U87组、CAR-NK+U87-EGFRvⅢ组,通过实时无标记细胞分析(RTCA)及乳酸脱氢酶(LDH)释放实验评价CAR-NK细胞对胶质瘤细胞的杀伤作用,同时使用酶联免疫吸附实验(ELISA)检测肿瘤坏死因子α(TNF-α)、γ干扰素(IFN-γ)、颗粒酶B(GzmB)以及穿孔蛋白1(PRF1)在细胞培养上清中的分泌情况。结果流式细胞分析显示分离、培养得到的人外周血来源NK细胞的纯度为97.6%,存活率为98.2%;成功构建第二代靶向EGFRvⅢ的CAR分子,并成功构建靶向EGFRvⅢ的CAR-NK细胞,流式分析显示阳性细胞率为69.6%。RTCA结果显示靶细胞的生长曲线随时间呈上升趋势,过表达EGFRvⅢ的U87细胞增殖速率要高于U87细胞;在加入效应细胞后,细胞指数呈现下降趋势,在相同效靶比(E∶T)下,CAR-NK+U87-EGFRvⅢ组的细胞指数下降趋势快于NK+U87-EGFRvⅢ组,且快于CAR-NK+U87组。LDH释放实验进一步证明随着效靶比的增加,靶细胞的裂解率逐渐升高(F_(NK+U87)=700.61、F_(CAR-NK+U87)=2063.97、F_(NK+U87)-EGFRvⅢ=5707.00、F_(CAR-NK+U87)-EGFRvⅢ=28858.57,均P0.05);CAR-NK+U87-EGFRvⅢ组分别与NK+U87-EGFRvⅢ组、CAR-NK+U87组相比,TNF-α、IFN-γ、GzmB、PRF1的分泌量均增高(均P<0.05)。结论靶向EGFRvⅢ的CAR-NK细胞对EGFRvⅢ表达阳性的胶质瘤细胞具有较强的杀伤作用,其抗肿瘤能力优于NK细胞。

关键词：神经胶质瘤受体,表皮生长因子杀伤细胞,天然体外研究

Resource utilization of high concentration SO_(2) for sulfur production over La-Ce-O_(x)@ZrO_(2) composite oxide catalyst

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Journal of Rare Earths 2023年第12期41卷 1945-1952,I0005页

作者： Yao Lu Qijie jin wenyu ji Chengzhang Zhu Mutao Xu Yingying Zhu Haitao Xu School of Environmental Science and Engineering Nanjing Tech UniversityNanjing210009China State Key Laboratory of Materials-Oriented ChemicalEngineering Nanjing Tech University Nanjing20009China College of Materials Science and Engineering Nanjing Tech UniversityNanjing210009China

Sulfur dioxide is one of the main causes of air pollution such as acid rain and photochemical smog,and its pollution control and resource utilization become an important research direction of air pollution control,The active component La-Ce-O_(x) is loaded on SiO_(2),γ-Al_(2)O_(3),TiO_(2) and ZrO_(2),and the La-Ce-Ox@ZrO_(2)exhibits the best catalytic *** adjusting the loading amount of La-Ce-O_(x),La-Ce-Ox@ZrO_(2) with different mass fractions was *** results show that the activity of 15%La-Ce-Ox@ZrO_(2)catalyst is the *** SO_(2)conversion is 100%,and the S yield and S selectivity are more than 96% at 350℃.According to the analysis results of H_(2)-TPR,CO_(2)-TPD and NH_(3)-TPD,ZrO_(2) as a support not only reduces the acidity of the catalyst,but also improves the weak alkaline sites of the catalyst,which is conducive to the adsorption and activation of SO2molecules at low *** incorporation of La and Ce increases the oxygen concentration adsorbed on the *** strong interaction between the support ZrO_(2) and the active component La-Ce-Oxis conducive to the electron transfer between the active component and the support,and improves the activity of the *** the 15%La-Ce-O_(x)@ZrO_(2),the main reaction intermediates are weakly adsorbed SO_(2)(SO_(3)^(2-)),bicoordinated CO_(3)^(2-),monodentate carbonate and CO in the gas ***,the catalytic reaction follows both L-H and E-R mechanisms.

关键词： La-Ce-Ox@ZrO_(2) Sulfur dioxide Carbon monoxide Resource utilization Catalytic mechanism Rare earths

Positive and negative shear lag behaviors of composite twin-girder decks with varying cross-section

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Science China(Technological Sciences) 2017年第1期60卷 116-132页

作者： ZHU Li NIE jianGuo ji wenyu School of Civil Engineering Beijing Jiaotong University Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry Department of Civil Engineering Tsinghua University

In steel-concrete composite twin-girder decks, wide concrete slab would undergo significant shear lag warping effect, including positive and negative. Some researchers have investigated the positive shear lag of composite decks by means of one-dimensional line model, while the studies on the negative shear lag have not yet been reported until now. In this study, a new one-dimensional analytical model of composite twin-girder decks is first proposed based on the model proposed by Dezi et al. Besides slab shear lag effect and partial connection at slab-girder interface which have been included in the model of Dezi et al., the particularity of the proposed model relies on its ability to account for variation characteristic of cross-section. Verification of the analytical model is later conducted through comparison of results from the analytical analysis and elaborate FE analysis for a simply supported composite deck with increasing depth and a two-span continuous one with decreasing depth. Finally, three kinds of structural forms of composite twin-girder decks, including cantilever, simply supported and continuous decks, are selected to carry out the analysis of positive and negative shear lag behaviors by means of the analytical model. The influences of cross-sectional variation characteristic and load type on positive and negative shear lag behaviors are mainly investigated. Additionally, a new definition on effective width for considering simultaneously positive and negative shear lag behaviors is proposed. The results from the proposed analytical model and EC4 specification are compared to provide suggestions for designers and checkers. In this study, the proposed analytical model can provide a powerful numerical tool for researchers to conduct the further investigation, and the analysis on shear lag and effective width can assist in design analysis of composite twin-girder decks.

关键词：钢水泥合成双胞胎系结甲板分析模型剖面图的变化积极、否定砍落后行为有效宽度

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儿童脑膜瘤18例并文献复习

中华小儿外科杂志 2024年第7期45卷 587-593页

作者：刘冬吉文玉图柯拜·吐尔托合提赵俊红杨茜涵玛合江·阿哈力别克凯赛·吐尔逊汪永新新疆医科大学第一附属医院小儿神经外科乌鲁木齐830054

目的探讨儿童脑膜瘤的临床特点和诊疗方式。方法回顾性分析2011年1月至2021年9月新疆医科大学第一附属医院收治的18例脑膜瘤患儿临床资料,其中男9例,女9例;患儿的中位年龄为11.5岁,范围在4~17岁。8例患儿首发症状为头痛呕吐,5例癫痫,3... 详细信息

目的探讨儿童脑膜瘤的临床特点和诊疗方式。方法回顾性分析2011年1月至2021年9月新疆医科大学第一附属医院收治的18例脑膜瘤患儿临床资料,其中男9例,女9例;患儿的中位年龄为11.5岁,范围在4~17岁。8例患儿首发症状为头痛呕吐,5例癫痫,3例偏瘫,1例步态不稳,另有1例为体检时发现。2例患儿入院前明确合并神经纤维瘤病,其余患儿无特殊既往史。总结18例患儿的术前诊断、影像学表现、肿瘤部位及切除程度、手术情况、组织学病理结果。以"脑膜瘤"及其英文"meningiomas""meningeal tumors"为关键词,检索于2000年1月至2022年6月发表并收录于万方、中国知网、维普、中国生物医学文献服务系统、PubMed、Google Scholar等数据库的相关文献,并行文献复习。结果本组18例患儿中术前17例行头颅磁共振检查,除6例误诊为其他肿瘤外,其余患儿诊断为脑膜瘤;肿瘤位于幕上15例,幕下3例。18例患儿中16例接受开颅手术,手术均顺利完成;手术全切11例,次全切除4例,部分切除1例。16例患儿术后肿瘤病理显示均为脑膜瘤,其中WHO分级Ⅰ级8例,Ⅱ级6例,Ⅲ级2例。术后15例接受随访6~126个月,1例复发,1例死亡,其余无肿瘤进展。最终检索到9篇符合标准的文献,结合本组18例患儿,共345例患儿,其中男189例,女性156;合并神经纤维瘤病38例;肿瘤位于幕上228例,幕下67例,其他部位50例;肿瘤全切率为59.7%(206/345),其中WHO分级Ⅰ级、Ⅱ级、Ⅲ级分别占比为72.1%(248/344)、20.9%(72/344)、7.0%(24/344),肿瘤复发率为29.0%(75/259),死亡率为8.9%(23/259)。结论脑膜瘤是一种罕见的儿童中枢神经系统肿瘤,与成人相比,其临床特征、影像学表现、病理特点等有所不同且多变,WHO分级Ⅱ级、Ⅲ级肿瘤占比高,手术是治疗的主要手段。

关键词：脑膜瘤症状儿童

Development of a software platform for bridge modal and damage identification based on ambient excitation

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High-Speed Railway 2023年第3期1卷 162-170页

作者： jiahuan Li Li Zhu wenyu ji Sunfeng You School of Civil Engineering Bejing Jiaotong UniversityBeijing 100044China

Modal and damage identification based on ambient excitation can greatly improve the efficiency of high-speed railway bridge vibration *** paper first describes the basic principles of stochastic subspace identification,peak-picking,and frequency domain decomposition method in modal analysis based on ambient excitation,and the effectiveness of these three methods is verified through finite element calculation and numerical simulation,Then the damage element is added to the finite element model to simulate the crack,and the curvature mode difference and the curvature mode area difference square ratio are calculated by using the stochastic subspace identification results to verify their ability of damage identification and ***,the above modal and damage identification techniques are integrated to develop a bridge modal and damage identification software *** final results show that all three modal identification methods can accurately identify the vibration frequency and mode shape,both damage identification methods can accurately identify and locate the damage,and the developed software platform is simple and efficient.

关键词： Vibration detection Software development Modal identification Damage identification Numerical verification

Critical Solvation Structures Arrested Active Molecules for Reversible Zn Electrochemistry

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Nano-Micro Letters 2024年第8期16卷 64-78页

作者： Junjie Zheng Bao Zhang Xin Chen wenyu Hao jia Yao jingying Li Yi Gan Xiaofang Wang Xingtai Liu Ziang Wu Youwei Liu Lin Lv Li Tao Pei Liang Xiao ji Hao Wang Houzhao Wan Hubei Yangtze Memory Laboratories Wuhan 430205People’s Republic of China Hubei Key Laboratory of Micro‑Nanoelectronic Materials and Devices School of MicroelectronicsHubei UniversityWuhan 430062People’s Republic of China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China Institute of Optoelectronics Technology China Jiliang UniversityHangzhou 310018People’s Republic of China

Aqueous Zn-ion batteries(AZIBs)have attracted increasing attention in next-generation energy storage systems due to their high safety and ***,the side reactions,dendrites and hydrogen evolution effects at the zinc anode interface in aqueous electrolytes seriously hinder the application of aqueous zinc-ion ***,we report a critical solvation strategy to achieve reversible zinc electrochemistry by introducing a small polar molecule acetonitrile to form a“catcher”to arrest active molecules(bound water molecules).The stable solvation structure of[Zn(H_(2)O)_(6)]^(2+)is capable of maintaining and completely inhibiting free water ***[Zn(H_(2)O)_(6)]^(2+)is partially desolvated in the Helmholtz outer layer,the separated active molecules will be arrested by the“catcher”formed by the strong hydrogen bond N-H bond,ensuring the stable desolvation of Zn^(2+).The Zn||Zn symmetric battery can stably cycle for 2250 h at 1 mAh cm^(-2),Zn||V_(6)O_(13) full battery achieved a capacity retention rate of 99.2%after 10,000 cycles at 10 A g^(-1).This paper proposes a novel critical solvation strategy that paves the route for the construction of high-performance AZIBs.

关键词： Zinc-ion battery Critical solvation Helmholtz layer Arrest active molecule Reversible zinc anode

On the accurate characterization of quantum-dot light-emitting diodes for display applications

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npj Flexible Electronics 2022年第1期6卷 351-362页

作者： Wangxiao jin Yunzhou Deng Bingbing Guo Yaxiao Lian Baodan Zhao Dawei Di Xiaowei Sun Kai Wang Shuming Chen Yixing Yang Weiran Cao Song Chen wenyu ji Xuyong Yang Yuan Gao Shuangpeng Wang Huaibin Shen jialong Zhao Lei Qian Fushan Li Yizheng jin Key Laboratory of Excited-State Materials of Zhejiang Province State Key Laboratory of Silicon MaterialsDepartment of ChemistryZhejiang University310027 HangzhouChina State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang University310027 HangzhouChina Department of Electronic and Electrical Engineering Southern University of Science and Technology518055 ShenzhenChina TCL Research ShenzhenGuangdongChina Shenzhen China Star Optoelectronics Semiconductor Display Technology Co. LtdShenzhenGuangdongChina College of Chemistry Chemical Engineering and Materials ScienceSoochow University199 Ren’ai Rd215123 SuzhouJiangsuChina Key Lab of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin University130023 ChangchunChina Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University149 Yanchang RoadShanghai 200072China Najing Technology Corporation Ltd Hangzhou 310052China Institute of Applied Physics and Materials Engineering University of MacaoTaipaMacaoSAR 999078China Key Laboratory for Special Functional Materials of Ministry of Education National&Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technologyand Collaborative Innovation Center of Nano Functional Materials and ApplicationsHenan UniversityKaifeng 475004China School of Physical Science and Technology MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and MaterialsGuangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004China Division of Functional Materials and Nanodevices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China College of Physics and Information Engineering Fuzhou UniversityFuzhou 350108China

Quantum dot light-emitting diodes(QLEDs)are a class of high-performance solution-processed electroluminescent(EL)devices highly attractive for next-generation display *** the encouraging advances in the mechanism investigation,material chemistry,and device engineering of QLEDs,the lack of standard protocols for the characterization of QLEDs may cause inaccurate measurements of device parameters and invalid comparison of different ***,we report a comprehensive study on the characterizations of QLEDs using various *** show that the emission non-uniformity across the active area,nonLambertian angular distributions of EL intensity,and discrepancies in the adopted spectral luminous efficiency functions could introduce significant errors in the device *** errors in the operational-lifetime measurements may arise from the inaccurate determination of the initial luminance and inconsistent methods for analyzing the luminance-decay ***,we suggest a set of recommended practices and a checklist for device characterizations,aiming to help the researchers in the QLED field to achieve accurate and reliable measurements.

关键词： diodes characterization luminous