检索结果-南通市图书馆

The Fabrication and Detection Performance of High Sensitivity Au-Ag Alloy Nanostar/Paper Flexible Surface Enhanced Raman Spectroscopy Sensors

引用

Journal of Wuhan University of Technology(Materials Science) 2024年第2期39卷 436-443页

作者：邓芷盈 WANG tianyi CAO Shiyi ZHAO Yuan han Xiaoyu 张继红谢俊 State Key Laboratory of Silicate Materials for Architectures Department of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Hainan Institute of Wuhan University of Technology Sanya 572000China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Hepu Research Center for Silicate Materials Industry Technology Beihai 536100China

Au-Ag alloy nanostars based flexible paper surface enhanced Raman spectroscopy sensors were fabricated through simple nanostar coating on regular office paper,and the surface enhanced Raman spectroscopy detection performances were investigated using crystal violet dye analyte.Au-Ag nanostars with sharp tips were synthesized via metal ions reduction method.Transmission electron microscope images,X-Ray diffraction pattern and energy dispersive spectroscopy elemental mapping confirmed the nanostar geometry and Au/Ag components of the nanostructure.UV-Vis-NIR absorption spectrum shows wide local surface plasmon resonance induced optical extinction.In addition,finite-difference time-domain simulation shows much stronger electromagnetic field from nanostars than from sphere nanoparticle.The effect of coating layer on Raman signal intensities was discussed,and optimized 5-layer coating with best Raman signal was obtained.The Au-Ag nanostatrs homogeneously distribute on paper fiber surface.The detection limit is 10-10 M,and the relationship between analyte concentrations and Raman signal intensities shows well linear,for potential quantitative analysis.The calculated enhancement factor is 4.795×10^(6).The flexible paper surface enhanced Raman spectroscopy sensors could be applied for trace chemical and biology molecule detection.

关键词： surface-enhanced raman gold-silver alloy nanostars paper-based SERS sensor flexibility

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Unlocking the secrets behind liquid superlubricity:A state-ofthe-art review on phenomena and mechanisms

引用

Friction 2022年第8期10卷 1137-1165页

作者： tianyi han Shuowen ZhanG Chenhui ZhanG State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

Superlubricity,the state of ultralow friction between two sliding surfaces,has become a frontier subject in tribology.Here,a state-of-the-art review of the phenomena and mechanisms of liquid superlubricity are presented based on our ten-year research,to unlock the secrets behind liquid superlubricity,a major approach to achieve superlubricity.An overview of the discovery of liquid superlubricity materials is presented from five different categories,including water and acid-based solutions,hydrated materials,ionic liquids(ILs),two-dimensional(2D)materials as lubricant additives,and oil-based lubricants,to show the hydrodynamic and hydration contributions to liquid superlubricity.The review also discusses four methods to further expand superlubricity by solving the challenge of lubricants that have a high load-carrying capacity with a low shear resistance,including enhancing the hydration contribution by strengthening the hydration strength of lubricants,designing friction surfaces with higher negative surface charge densities,simultaneously combining hydration and hydrodynamic contribution,and using 2D materials(e.g.,graphene and black phosphorus)to separate the contact of asperities.Furthermore,uniform mechanisms of liquid superlubricity have been summarized for different liquid lubricants at the boundary,mixed,and hydrodynamic lubrication regimes.To the best of our knowledge,almost all the immense progresses of the exciting topic,superlubricity,since the first theoretical prediction in the early 1990s,focus on uniform superlubricity mechanisms.This review aims to guide the research direction of liquid superlubricity in the future and to further expand liquid superlubricity,whether in a theoretical research or engineering applications,ultimately enabling a sustainable state of ultra-low friction and ultra-low wear as well as transformative improvements in the efficiency of mechanical systems and human bodies.

关键词： liquid superlubricity hydrodynamic lubrication hydration lubrication surface potential surface forces

来源：

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

Parboiled rice supplementation alleviates high-fat diet-induced hyperlipidemia by regulating genes and gut microbiota in mice

引用

Food Science and Human Wellness 2024年第3期13卷 1422-1438页

作者： Xiuxiu Wu tianyi Guo Biao Li Shuai han Zuomin Hu Yi Luo Dandan Qin Yaping Zhou Feijun Luo Qinlu Lin National Research Center of Rice Deep Process and Byproducts Hunan Provincial Key Laboratory of Grain-oil Deep Process and Quality ControlHunan Provincial Key Laboratory of Forestry Edible Resources Safety and ProcessingCentral South University of Forestry and TechnologyChangsha 410004China College of Life Science and Technology Central South University of Forestry and TechnologyChangsha 410004China Department of Clinical Medicine Medical College of XiangyaCentral South UniversityChangsha 410008China

Dietary parboiled rice(PR)has a low risk of disease,but little is known about the contribution of PR to the prevention of hyperlipidemia.The potential role and underlying mechanisms of PR in hyperlipidemia were evaluated in this study.Male C57BL/6J mice were fed with a normal diet,high-fat diet(HFD)containing refined rice(HFDRR)or PR(HFDPR).It was found that PR intervention improved lipid accumulation in mice.Transcriptomic data analysis revealed that 27 genes were up-regulated(mostly involved in lipid breakdown)and 86 genes were down-regulated(mostly involved in inflammatory responses)in the HFDPR group compared to the HFDRR group.And 15 differentially expressed genes(DEGs)were validated by quantitative real-time PCR(RT-qPCR),while protein interaction network showed that protein tyrosine phosphatase receptor type C(PTPRC)has a central role.The gut microbiota of mice was also altered after different dietary treatments,with higher ratio of Firmicutes and Bacteroidetes,increased abundances of Ruminococcaceae,Lachnospiraceae,Christensenellaceae,Porphyromonadaceae,Rikenellaceae and Prevotellaceae,and decreased abundances of Lactobacillaceae,Peptostreptococcaceae,Erysipelotrichaceae and Actinobacteria in the HFDRR group.In addition,it was observed that PPAR signaling pathway may act as a bridge between DEGs and differential gut microbiota.These results suggested that PR can prevent hyperlipidemia by modulating liver genes and gut microbiota.

关键词： Parboiled rice Blood lipids Transcriptome Gut microbiota PPAR Signaling pathway

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Size effects in the uniaxial compressive properties of 3D printed models of rocks:an experimental investigation

引用

International Journal of Coal Science & Technology 2022年第6期9卷 1-12页

作者： Hao Wu Yang Ju Xin han Zhangyu Ren Yue Sun Yanlong Zhang tianyi han School of Mechanics&Civil Engineering China University of Mining&Technology(Beijing)Beijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining&Technology(Beijing)Beijing 100083China School of Emergency Management and Safety Engineering China University of Mining&Technology(Beijing)Beijing 100083China

Transparent physical models of real rocks fabricated using three-dimensional(3D)printing technology are used in photoelas-tic experiments to quantify the evolution of the internal stress and deformation fields of rocks.Therefore,they are rendered as an emerging powerful technique to quantitatively reveal the intrinsic mechanisms of rock failure.The mechanical behav-ior of natural rocks exhibits a significant size effect;however,limited research has been conducted on whether transparent physical models observe similar size effects.In this study,to make the transparent printed models accurately demonstrate the mechanical behavior of natural rocks and reveal the internal mechanism of the size effect in rock mechanical behavior,the size effect in 3D printed models of fractured and porous rocks under uniaxial compressive loading was investigated.Transparent cylindrical models with different sizes that contained different fractured and porous structures were printed using the fracture and porous characteristics extracted from natural coal and sandstone.The variation in uniaxial compres-sive strength and elastic modulus of fractured and porous models for increasing model sizes were obtained through uniaxial compression experiments.Finally,the influence of internal discontinuous structural features,such as fractures and pores,on the size effect pertaining to the mechanical behavior of the model was analyzed and elaborated by comparing it with the mechanical properties of the continuous homogeneous model without fractures and pores.The findings provided support and reference to analyze the size effect of rock mechanical behavior and the effect of the internal discontinuous structure using 3D printed transparent models.

关键词： Size effect 3D printed model Rocks Mechanical property Fractures Pores

来源：

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

Refined microstructure and enhanced mechanical properties of AlCrFe_(2)Ni_(2) medium entropy alloy produced via laser remelting

引用

Journal of Materials Science & Technology 2022年第4期99卷 18-27页

作者： tianyi han Yong Liu Mingqing Liao Danni Yang Nan Qu Zhonghong Lai Jingchuan Zhu School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China Center of Analysis and Measurement and Computing Harbin Institute of TechnologyHarbin 150001China

A Co-free as-cast AlCrAlCrFe_(2)Ni_(2)medium entropy alloy(MEA)with multi-phases was remelted by fiber laser in this study.The effect of laser remelting on the microstructure,phase distribution and mechanical properties was investigated by characterizing the as-cast and the remelted AlCrAlCrFe_(2)Ni_(2)alloy.The laser remelting process resulted in a significant decrease of grain size from about 780μm to 58.89μm(longitudinal section)and 15.87μm(transverse section)and an increase of hardness from 4.72±0.293 GPa to 6.40±0.147 GPa(longitudinal section)and 7.55±0.360 GPa(transverse section).It was also found that the long side plate-like microstructure composed of FCC phase,ordered B2 phase and disordered BCC phase in the as-cast alloy was transformed into nano-size weave-like microstructure consisting of alternating ordered B2 and disordered BCC phases.The mechanical properties were evaluated by the derived stressstrain relationship obtained from nano-indentation tests data.The results showed that the yield stress increased from 661.9 MPa to 1347.6 MPa(longitudinal section)and 1647.2 MPa(transverse section)after remelting.The individual contribution of four potential strengthening mechanisms to the yield strength of the remelted alloy was quantitatively evaluated,including grain boundary strengthening,dislocation strengthening,solid solution strengthening and precipitation strengthening.The calculation results indicated that dislocation and precipitation are dominant strengthening mechanisms in the laser remelted MEA.

关键词： Medium entropy alloy Laser remelting Microstructure Nano-indentation Strengthening mechanism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Radio-frequency measurement in semiconductor quantum computation

引用

Science China(Physics,Mechanics & Astronomy) 2017年第5期60卷 36-48页

作者： tianyi han MingBo Chen Gang Cao HaiOu Li Ming Xiao GuoPing Guo Key Laboratory of Quantum Information Chinese Academy of SciencesUniversity of Science and Technology of ChinaHefei 230026China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

Semiconductor quantum dots have attracted wide interest for the potential realization of quantum computation.To realize efficient quantum computation,fast manipulation and the corresponding readout are necessary.In the past few decades,considerable progress of quantum manipulation has been achieved experimentally.To meet the requirements of high-speed readout,radio-frequency(RF)measurement has been developed in recent years,such as RF-QPC(radio-frequency quantum point contact)and RF-DGS(radio-frequency dispersive gate sensor).Here we specifically demonstrate the principle of the radio-frequency refiectometry,then review the development and applications of RF measurement,which provides a feasible way to achieve high-bandwidth readout in quantum coherent control and also enriches the methods to study these artificial mesoscopic quantum systems.Finally,we prospect the future usage of radio-frequency refiectometry in scaling-up of the quantum computing models.

关键词：射频测量量子计算半导体

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

顾及时变特性的时序极化SAR图像自适应超像素生成方法

引用

遥感学报 2024年第4期28卷 1066-1075页

作者：叶家伟汪长城高晗沈鹏宋天祎胡驰浩中南大学地球科学与信息物理学院长沙410083

超像素生成是对象级数据处理体系的重要预处理步骤,这对于拥有大数据量的多时相、多极化SAR数据的高效处理和应用具有很大的现实意义。针对单时相超像素分割方法没有充分利用地物在时序上完整散射信息的问题,本文综合利用时序极化SAR数... 详细信息

超像素生成是对象级数据处理体系的重要预处理步骤,这对于拥有大数据量的多时相、多极化SAR数据的高效处理和应用具有很大的现实意义。针对单时相超像素分割方法没有充分利用地物在时序上完整散射信息的问题,本文综合利用时序极化SAR数据观测充分、可描述时变特性等优势,提出了一种基于简单线性迭代聚类(SLIC)模型的多时相极化SAR影像自适应超像素生成方法。该方法首先联合多个时相的极化协方差矩阵,基于Wishart分布计算时序极化SAR相似性距离;然后利用多时相极化SAR数据进行梯度计算,检测图像边缘;最后提出一种基于多时相极化SAR边缘检测的同质性测度因子,用于自适应平衡极化距离和空间距离的权重关系。本文使用8景Radarsat-2全极化SAR影像,从可视化效果和定量精度两个方面评价方法有效性。相关结果表明,本文方法优于单时相极化SAR超像素生成方法和现有的多时相极化SAR超像素方法,超像素能够有效贴合研究区域地块边界,是一种有效的超像素生成方法。

关键词：遥感极化SAR 图像分割 SLIC算法超像素多时相

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

子图增强的实时同名消歧

引用

中文信息学报 2024年第1期38卷 45-56页

作者：韩天翼程欣宇张帆进陈波贵州大学公共大数据国家重点实验室贵州贵阳550025 贵州大学文本计算与认知智能教育部工程研究中心贵州贵阳550025 清华大学计算机科学与技术系北京100084

实时同名消歧旨在实时、准确地将具有歧义的作者姓名的新增论文关联到同名候选作者中的正确作者。当前同名消歧算法主要解决冷启动同名消歧问题,较少探索如何高效并有效地解决实时同名消歧问题。该文提出了子图增强的实时同名消歧模型RN... 详细信息

实时同名消歧旨在实时、准确地将具有歧义的作者姓名的新增论文关联到同名候选作者中的正确作者。当前同名消歧算法主要解决冷启动同名消歧问题,较少探索如何高效并有效地解决实时同名消歧问题。该文提出了子图增强的实时同名消歧模型RND-all,该模型通过高效地融合待消歧论文与候选作者之间的结构特征来提升模型的准确率。模型根据待消歧论文的属性与同名候选作者的档案分别构建子图,使用子图结构特征提取框架来计算图相关性特征,最后,通过特征工程以及文本嵌入方法计算语义匹配特征,并利用集成学习实现语义信息与结构信息的融合。实验结果表明,融入结构信息能够有效提升实时同名消歧任务的准确性,RND-all在百万级同名消歧基准WhoIsWho测试集上效果排名第一。

关键词：实时同名消歧图神经网络结构信息集成学习

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Innovation and Practice of Training Mode for Professional Postgraduates of Acupuncture and Tuina Based on Artificial Intelligence

引用

Asian Agricultural Research 2024年第3期16卷 46-48页

作者： Mingjun LIU Xiaochao GANG Zhengri CONG Junhao HU Jianfeng LIANG Chongwen ZHONG Xinyi YUAN Bing DAI Yuzhe ZhanG Lijie LI tianyi MU Yiran han Chaochao HUA College of Acupuncture and Tuina Changchun University of Chinese MedicineChangchun 130117China The Third Affiliated Hospital of Changchun University of Chinese Medicine Changchun 130117China College of Special Education Changchun UniversityChangchun 130022China Department of Orthopaedics Pingyang BranchChangchun Hospital of Traditional Chinese MedicineChangchun 130000China

In view of the common problems of integrating artificial intelligence into the training of postgraduates in Acupuncture and Tuina major,this paper reviews the related research progress both at home and abroad.It puts forward the innovative reform paths for integrating artificial intelligence into postgraduate training mode of Acupuncture and Tuina major:construct the teaching staff of artificial intelligence graduate students;innovating artificial intelligence to promote the integration of classics and scientific research;constructing the ideological and political case base of artificial intelligence courses;implementing artificial intelligence platform blended teaching;building a domestic and foreign exchange platform for artificial intelligence.Through practical research in teaching,it has achieved good teaching results and played a good demonstration,leading and radiation role in similar majors in China.

关键词： Artificial intelligence (AI) Acupuncture and Tuina major Professional postgraduates Training mode

来源：

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

注意缺陷多动障碍患儿大脑皮质结构异常研究进展

引用

实用医学杂志 2024年第10期40卷 1455-1459页

作者：袁海霞韩新民陈天翼宋宇尘南京中医药大学附属医院儿科南京210029 南京中医药大学中西医结合学院南京210023

神经影像学技术在注意缺陷多动障碍(ADHD)研究领域的应用日趋广泛,越来越多研究表明ADHD患者存在皮质体积减少、厚度变薄、表面积降低等结构异常,这些结构异常与患者复杂的临床症状及大脑功能异常具有一定相关性。然而使用神经影像技术... 详细信息

神经影像学技术在注意缺陷多动障碍(ADHD)研究领域的应用日趋广泛,越来越多研究表明ADHD患者存在皮质体积减少、厚度变薄、表面积降低等结构异常,这些结构异常与患者复杂的临床症状及大脑功能异常具有一定相关性。然而使用神经影像技术识别生物标志物作为ADHD的客观诊断工具仍面临诸多挑战。多模态研究来探讨ADHD患者不同脑区结构与功能的关系,利用神经影像学揭示ADHD患者整个生命周期临床症状演变的机制可作为未来研究的重要方向。

关键词：注意缺陷多动障碍皮质结构异常研究进展

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：