检索结果-南通市图书馆

Synthesis of D-A typed AIE luminogens in isomeric architecture and their application in latent fingerprints imaging

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国化学快报:英文版 2023年第8期34卷 365-369页

作者： Peijuan Zhang Qifei Shen Yu Zhou Fengyi He Bo Zhao Zhi Wang Ruohan Xu Yanzi Xu Zhiwei Yang Lingjie Meng dongfeng dang School of Chemistry Xi’an Key Laboratory of Sustainable Energy Material ChemistryXi’an Jiao Tong UniversityXi’an 710049China Instrumental Analysis Center Xi’an Jiao Tong UniversityXi’an 710049China School of Physics Xi’an Jiao Tong UniversityXi’an 710049China

Among the emitters in powder dusting to visualize the latent fingerprints(LFPs),aggregation-induced emission luminogens(AIEgens)are well employed for their high brightness and resistance to ***,the serious background interference and low resolution still limit their fast ***,to further enhance the signal-to-noise ratio in LFPs imaging,especially to improve the analysis for level 3 details,donor-acceptor(D-A)typed AIEgens of DTPA-2,3-P,DTPA-2,5-P and DTPA-2,6-P are designed *** is observed that strong emission covering from 450nm to 650nm can be obtained for all these molecules,especially that a high PLQY value of 10.06%in solids is achieved in DTPA-2,*** is much higher than that of the other two cases(0.80%and 0.51%).By utilizing the DTPA-2,3-P in powder dusting,fluorescence imaging of LFPs can be clearly captured on both smooth and rough ***,confocal laser scanning microscope(CLSM)enables us to achieve high-resolution LFPs imaging in both 2D and 3D views,providing more detailed information of fingerprints pores in width,distance,distribution,and *** results here demonstrate that highly emissive AIEgen of DTPA-2,3-P could be an excellent candidate for the visualization of fingerprints,thus providing the potential application in criminal investigation in the future.

关键词： Aggregation-induced emission Fluorescence imaging Latent fingerprints Powder dusting Organic emitters

Boron-doped high-entropy oxide toward high-rate and long-cycle layered cathodes for wide-temperature sodium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第8期95卷 577-587,I0012页

作者： Yuzhen dang Zhe Xu Yurong Wu Runguo Zheng Zhiyuan Wang Xiaopin Lin Yanguo Liu Zheng-Yao Li Kai Sun dongfeng Chen Dan Wang School of Materials Science and Engineering Northeastern UniversityShenyang 110819LiaoningChina School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004HebeiChina Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province Qinhuangdao 066004HebeiChina Neutron Scattering Laboratory Department of Nuclear PhysicsChina Institute of Atomic EnergyBeijing 102413China

03-type layered metal oxides hold great promise for sodium-ion batteries cathodes owing to their energy density ***,the severe irreversible phase transition and sluggish Na^(+)diffusion kinetics pose significant challenges to achieve high-performance layered ***,a boron-doped03-type high entropy oxide Na(Fe_(0.2)Co_(0.15)Cu_(0.05)Ni_(0.2)Mn_(0.2)Ti_(0.2))B_(0.02)O_(2)(NFCCNMT-B_(0.02))is designed and the covalent B-O bonds with high entropy configuration ensure a robust layered *** obtained cathode NFCCNMT-B_(0.02)exhibits impressive cycling performance(capacity retention of 95%and 82%after100 cycles and 300 cycles at 1 and 10 C,respectively)and outstanding rate capability(capacity of 83 mAh g^(-1)at 10 C).Furthermore,the NFCCNMT-B_(0.02)demonstrates a superior wide-temperature performance,maintaining the same capacity level(113,4 mAh g^(-1)@-20℃,121 mAh g^(-1)@25℃,and 119 mAh g^(-1)@60℃)and superior cycle stability(90%capacity retention after 100 cycles at 1 C at-20℃).The high-entropy configuration design with boron doping strategy contributes to the excellent sodium-ion storage *** high-entropy configuration design effectively suppresses irreversible phase transitions accompanied by small volume changes(ΔV=0.65 A3).B ions doping expands the Na layer distance and enlarges the P3 phase region,thereby enhancing Na^(+)diffusion *** work offers valuable insights into design of high-performance layered cathodes for sodium-ion batteries operating across a wide temperature.

关键词： High entropy oxide Born substitution Phase transition Na~+diffusion kinetics Sodium-ion batteries

大学生综合创新实验:四苯基乙烯的聚集诱导发光特性研究及其指纹成像应用

在线全文

学校读者我要写书评

暂无评论

大学化学 2022年第12期37卷 162-169页

作者：张珮娟赵博何凤仪罗寒飞申起飞党东锋西安交通大学化学学院西安710049

近年来,大学生综合创新实验在丰富实验教学内容、探索新型教学模式、提高学生创新实践能力和综合素养等方面发挥着越来越重要的作用。然而,由于大学生有限的时间和精力,同时大多数学生对创新实验的背景及内容了解不深,因此,如何提出一... 详细信息

近年来,大学生综合创新实验在丰富实验教学内容、探索新型教学模式、提高学生创新实践能力和综合素养等方面发挥着越来越重要的作用。然而,由于大学生有限的时间和精力,同时大多数学生对创新实验的背景及内容了解不深,因此,如何提出一个时长合适、难度适中,并且能够引发学生兴趣的综合创新实验非常重要,也是实现实验教学培养目标的关键之一。基于此,结合“聚集诱导发光”这一国人引领的学术前沿研究热点,通过聚集诱导发光材料四苯基乙烯与传统荧光材料4’,5’-二溴荧光素的光物理性能对比及其在指纹成像中的应用研究,进一步丰富创新实验教学内容。在拓展学生对相关前沿研究和背景知识了解的同时,加强学生对荧光光谱仪等仪器的掌握,提高其实践操作水平。本综合创新实验的实施也能够培养和提高学生发现问题、解决问题的水平和能力,为提升其科研素养和养成创新思维等提供新的探索思路。

关键词：综合创新实验聚集诱导发光荧光指纹成像

芳香族硝基化合物自加速分解温度的定量结构-性质关系

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

中国石油大学学报（自然科学版） 2023年第6期47卷 171-177页

作者：赵东风秦传睿党梦涛中国石油大学(华东)化学化工学院山东青岛266580 中国石油大学(华东)机电工程学院山东青岛266580

针对芳香族硝基化合物生产、运输以及储存过程中引发的重特大燃爆事故,采用试验及模型计算等方式对其自加速分解温度(SADT)进行获取,并提出一种基于定量结构-性质关系(QSPR)的理论预测方法。通过绝热加速量热试验获取18种芳香族硝基化... 详细信息

针对芳香族硝基化合物生产、运输以及储存过程中引发的重特大燃爆事故,采用试验及模型计算等方式对其自加速分解温度(SADT)进行获取,并提出一种基于定量结构-性质关系(QSPR)的理论预测方法。通过绝热加速量热试验获取18种芳香族硝基化合物的热力学和动力学参数,以此计算得到25 kg标准包装下物质的自加速分解温度。应用多元线性回归(MLR)和人工神经网络(ANN)等机器学习方法分别构建相应的预测模型,最终验证并比较两种模型的拟合能力、鲁棒性和预测能力。结果表明:芳香族硝基化合物对应MLR模型和ANN模型的相关系数分别为0.893和0.975,ANN模型在匹配度方面明显优于MLR模型。

关键词：芳香族硝基化合物自加速分解温度定量结构-性质关系

维普期刊数据库博看期刊

Lean Process Design Based on Standard Time Analysis

在线全文

学校读者我要写书评

暂无评论

Lean Process Design Based on Standard Time Analysis

Temporal dynamics of SARS-CoV-2 genome mutations that occurred in vivo on an aircraft

2020中国汽车工程学会年会暨展览会

作者： dang Yongkun Technical Center of dongfeng Motor Group Co. Ltd.

In the life cycle of automobile products,the design stage determines the cost of more than 70% of the product life *** the product design is finalized,the space for cost reduction is very *** design is to reduce unnecessary cost links to achieve high quality,high efficiency and low *** the process design stage,by analyzing the Working time\s of the process,integrating the parameters such as DST（design standard time）,PST（process standard time）,K（impact time on other processes）,Δt（waiting time）,the general assembly process will be displayed on the map,and the "congestion" and "detour" judgment models of the process will be established with the time navigation path analysis method,so as to appears the waste in the process design as the way of"congestion" and "detour".Aiming at the process of "congestion" and "detour",we should improve the process,optimize the process,adjust the process path,and achieve the purpose of eliminating waste and achieving lean process design.

关键词： lean design time analysis time navigation path analysis method process time map

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Biosafety and Health 2023年第1期5卷 62-67页

作者： Yaqing He Shengyuan dang Wentai Ma Long Chen Renli Zhang Shujiang Mei Xinyi Wei Qiuying Lv Bo Peng Ying Sun dongfeng Kong Jiancheng Chen Shimin Li Xiujuan Tang Qingju Lu Can Zhu Zhigao Chen Jia Wan Xuan Zou Mingkun Li Tiejiang Feng Lili Ren Jianwei Wang Shenzhen Research Center for Communicable Disease Control and Prevention Chinese Academy of Medical SciencesShenzhen 518055China Center for Disease Control and Prevention Shenzhen 518055China National Health Commission of the People’s Republic of China Key Laboratory of Systems Biology of Pathogens and Christophe Mérieux Laboratory Institute of Pathogen BiologyChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China University of Chinese Academy of Sciences Beijing 100190China Key Laboratory of Genomic and Precision Medicine Beijing Institute of GenomicsChinese Academy of Sciencesand China National Center for BioinformationBeijing 100101China Center for Excellence in Animal Evolution and Genetics Chinese Academy of SciencesKunming 650223China Key Laboratory of Respiratory Disease Pathogenomics Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100730China

We analyzed variations in the severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)genome during a flight-related cluster outbreak of coronavirus disease 2019(COVID-19)in Shenzhen,China,to explore the characteristics of SARS-CoV-2 transmission and intra-host single nucleotide variations(iSNVs)in a confined ***-three patients with COVID-19 were sampled,and 14 were resampled 3-31 days *** 47 nasopharyngeal swabs were *** and similarities in the consensus genome sequence were *** SARS-CoV-2 variants of concern,Delta(n=31),Beta(n=1),and C.1.2(n=1),were detected among the 33 *** viral genome sequences from 30 Delta-positive patients had similar SNVs;14 of these patients provided two successive ***,the 47 sequenced genomes contained 164 *** the 14 paired(successive)samples,the second samples(T2)contained more iSNVs(median:3;95%confidence interval[95%CI]:2.77-10.22)than did the first samples(T1;median:2;95%CI:1.63-3.74;Wilcoxon test,P=0.021).38 iSNVs were detected in T1 samples,and only seven were also detectable in T2 ***,T2 samples from two of the 14 paired samples had additional mutations than the T1 *** iSNVs of the SARS-CoV-2 genome exhibited rapid dynamic changes during a flight-related cluster outbreak ***-host diversity increased gradually with time,and new site mutations occurred in vivo without a population transmission ***,we could not determine the generational relationship from the mutation site changes alone.

关键词： SARS-CoV-2 Cluster epidemic Intra-host single nucleotide variation

热处理对25SiMn钢晶粒尺寸和珠光体含量影响分析

在线全文

学校读者我要写书评

暂无评论

大型铸锻件 2023年第1期 30-35页

作者：刘玉庆姚东峰董文林党强苑峻铭山东省特种设备检验研究院集团有限公司山东济南250000

针对热处理后25SiMn轴锻件法兰端表层存在粗大的珠光体团簇和魏氏组织,形成晶粒度低于0级的混晶现象,研究了正火温度和保温时间对25SiMn钢晶粒尺寸和珠光体含量的影响。试验发现:25SiMn钢在900℃以下正火时晶粒尺寸较为稳定,高于920℃... 详细信息

针对热处理后25SiMn轴锻件法兰端表层存在粗大的珠光体团簇和魏氏组织,形成晶粒度低于0级的混晶现象,研究了正火温度和保温时间对25SiMn钢晶粒尺寸和珠光体含量的影响。试验发现:25SiMn钢在900℃以下正火时晶粒尺寸较为稳定,高于920℃会导致晶粒粗大、加剧混晶,影响综合性能。

关键词：正火温度保温时间正火晶粒尺寸珠光体含量

在线全文

学校读者我要写书评

暂无评论

高填方工程监测信息化集成技术研究

工程勘察 2018年第8期46卷 41-44页

作者：杨超丁吉峰潘东峰张妙党广利机械工业勘察设计研究院有限公司西安710043 内蒙古科技大学附属中学内蒙古包头014030

高填方工程作为复杂的系统工程,动态化设计与信息化管理对工程整体的质量与安全显得尤为重要。为确切反映高填方工程施工过程及工后实际变形程度和变形趋势,实现高填方工程信息化,需进行高填方工程变形测量,并对高填方工程海量监测数据... 详细信息

高填方工程作为复杂的系统工程,动态化设计与信息化管理对工程整体的质量与安全显得尤为重要。为确切反映高填方工程施工过程及工后实际变形程度和变形趋势,实现高填方工程信息化,需进行高填方工程变形测量,并对高填方工程海量监测数据实现信息化集成技术管理。本文基于面向对象的程序设计语言C#、大型关系型数据库平台Oracle,运用工程可视化技术与地理信息系统(GIS)技术思想,将数据采集、管理、分析、展示及三维可视化无缝集成,设计多源实时动态化海量数据变形监测管理系统,满足了施工过程及工后安全管理的需要。该系统具有方便、快捷、及时、准确、直观的特点,已应用于陕北黄土高填方项目,并取得了良好效果。

关键词：高填方工程监测信息化集成技术

在线全文

学校读者我要写书评

暂无评论

双向挡水式钢闸门施工技术应用

河南科技 2021年第19期40卷 59-61页

作者：董党中国水利水电第十一工程局有限公司河南郑州450001

双向挡水式钢闸门止水是否严密,主要与闸门安装精度和止水结构有关。以郑东新区东风渠如意河互通工程为例,探讨双向挡水式钢闸门在郑州水系中的应用。实践证明:该技术的应用实现了如意河的通航要求,较好地满足了安全、质量和进度履约要... 详细信息

双向挡水式钢闸门止水是否严密,主要与闸门安装精度和止水结构有关。以郑东新区东风渠如意河互通工程为例,探讨双向挡水式钢闸门在郑州水系中的应用。实践证明:该技术的应用实现了如意河的通航要求,较好地满足了安全、质量和进度履约要求,社会效益和经济效益显著。

关键词：双向挡水式钢闸门安装精度止水结构