检索结果-南通市图书馆

Chirality transfer induced circularly polarized luminescence of achiral dye molecules by plasmonic nanohelicoid

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第9期17卷 8408-8414页

作者： Han Gao ChunLian Zhan tianqi zhao Jianzhong Zheng College of Optical and Electronic Technology China Jiliang UniversityHangzhou 310018China School of Environmental Science and Engineering Nanjing Tech UniversityNanjing 211816China

Optical materials with circularly polarized luminescence(CPL)features have attracted a growing interest due to their crucial role in biological sensing,display,spintronics,information storage,and so ***,CPL emissions in hybrid nanoparticle systems,in particular,chirality transfer induced CPL from chiral plasmonic nanoparticles,have rarely been explored due to a lack of effective bottom-up synthesis ***,we creatively take advantage of the newly introduced chiral plasmonic nanoparticles-gold nanohelicoid(GNH)to excite the CPL of achiral Rhodamine 6G(R6G).The fabricated GNH@R6G-SiO_(2)shows obvious CPL signals with|g_(lum)|up to *** with the single GNH,the photoluminescence(PL)dissymmetry factor of the single GNH@R6G-SiO_(2)is similar,but with 25 folds higher PL intensities under different circular *** research not only offers an effective and feasible method to fabricate single-particle level CPL-active materials,but also provides guidelines on how to regulate the CPL of achiral luminophores from chiral plasmonic nanostructures,thereby enlarging the category and quantity of CPL-active materials that can be applied for photonic technologies and visualization biosensing,especially some intracellular chirality related detection.

关键词： circularly polarized luminescence gold nanohelicoids chiral plasmonic

Facile Synthesis of Al-pillared Mesoporous Montmorillonite Assisted with Concentrated Al13 Solution

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

Chemical Research in Chinese Universities 2014年第2期30卷 200-204页

作者： zhao tianqi LI Wenjie WANG Hongyan MENG Fanyu College of Chemistry Jilin University Changchun 130012 P.R.China

Al-pillared mesoporous montmorillonite was facilely synthesized from concentrated Al13 solution obtained by vacuum concentrating-ultrasonic pillaring *** Al13 solution could reduce the process of pillare and increase pillaring *** absolute value of layer distance could be increased by 0.96 nm via concentrated Al13 solution pillare.27Al NMR indicates that Al Keggin ions of concentrated Al13 are arranged in a more regular way by vacuum concentrating *** Al-pillared mesoporous montmorillonite from concentrated Al13 solution has bigger specific surface area and even pore size distribution which were characterized by X-ray diffraction（XRD） and nitrogen adsorption *** the catalytic activity of Ai-pillared montmorillonite loaded Ni and Mo catalysts was tested by the hydrodesulfurization of *** thiophene conversion reached 77.5％,which was higher than the corresponding value reported in the literature.

关键词： Pillared montmorillonite Mesoporous material Vacuum concentrating-ultrasonic

A mechanically durable,excellent recyclable 3D hierarchical Ni_(3)S_(2)@Ni foam photothermal membrane

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

Green Energy & Environment 2022年第3期7卷 492-499页

作者： Zhongping Yao Kailun Yu Mengyao Pan Hongbo Xu tianqi zhao zhaohua Jiang School of Chemistry and Chemical Engineering State Key Laboratory of Urban Water Resource and EnvironmentHarbin Institute of TechnologyHarbin150001China

Solar-driven water evaporation is considered to be a viable and very efficient technology for fresh water ***,the photothermal membrane has a low absorptivity,low photothermal conversion and poor recyclability,which are difficult to meet the demands of self-floating solar driven evaporators in practical ***,a hierarchical nanostructure Ni_(3)S_(2) has been prepared by in-situ growing method on Ni foam(NF),which shows excellent absorptivity,outstanding recyclable and high mechanically durable *** photothermal membrane was composed of hierarchical nanostructure Ni_(3)S_(2)@NF,which exhibited excellent solar absorption(93.13%) in the wavelength range of 250–2500 nm and sustained anti-corrosion capacity for one *** addition,the hierarchical nanostructure Ni_(3)S_(2)@NF has good hydrophilicity and strong binding force,indicating this photothermal membrane exhibits good stability and outstanding photothermal conversion *** evaporation system based on 3D Ni_(3)S_(2)@NF membrane exhibited excellent water evaporation ability,the highest water evaporation rate(1.53 kg m^(-2)h^(-1)) and the photothermal conversion efficiency(84.7%) under 1 sun *** the desalination experiment,the water evaporation rate and photothermal conversion efficiency almost keep constant over 5 cycles tests and do not decrease compared with the experiment in pure *** result demonstrated that the Ni_(3)S_(2)@NF membrane has shown good corrosion resistance and outstanding *** to the simple preparation method,low cost,outstanding recyclability and high mechanical durability in the sea water,this Ni_(3)S_(2)@NF membrane have great potential for long-term solar distillation applications.

关键词： corrosion durability illumination

在线全文

学校读者我要写书评

暂无评论

不同坡位对荒漠草原植物群落特征的影响

东北林业大学学报 2025年第1期53卷 15-22页

作者：宁璐要振宇高天明穆文奎达古拉张增宝刘心宇赵天启刘静杨振奇水利部牧区水利科学研究所呼和浩特010020 呼和浩特市气象局鄂尔多斯市水利事业发展中心

荒漠草原是草原生态系统重要的组成部分,也是草原区向荒漠区过渡地带,物种多样性和生产力较低,并且随着生态环境的恶化,荒漠草原荒漠化程度不断加剧,对植物的生长及群落分布产生重要影响。为了解不同坡位对荒漠草原植被群落结构特征的影... 详细信息

荒漠草原是草原生态系统重要的组成部分,也是草原区向荒漠区过渡地带,物种多样性和生产力较低,并且随着生态环境的恶化,荒漠草原荒漠化程度不断加剧,对植物的生长及群落分布产生重要影响。为了解不同坡位对荒漠草原植被群落结构特征的影响,以希拉穆仁荒漠草原作为研究区,在无人为干扰活动的荒漠草原围封区内,选择坡度25°的3块长方形样地(300 m×100 m),分别在3块长方形样地的坡上、坡中、坡下分别设置1 m×1 m的样方,调查记录每个样方内植被的种名(科、属、种)、植被的高度、密度等,通过野外调查数据,分析不同坡位对荒漠草原植物群落区系特征和结构特征的影响。结果表明:野外调查共统计植物39种,隶属22科33属;生活型以多年生草本为主,总计34种,占物种总数的87.18%;水分生态类型以旱生植物为主,总计27种,占物种总数的69.23%;地理成分以东古北极分布种为主,总计17种,占物种总数的43.58%。受坡位的影响,植被盖度、建群种高度、群落生产力、Shannon-Wienner指数和Simpson指数由大到小的顺序均为坡下、坡中、坡上,Pielou指数由大到小的顺序为坡上、坡中、坡下。

关键词：荒漠草原坡位植物群落区系植物群落特征

Auxiliary diagnostic system for ADHD in children based on AI technology

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2021年第3期22卷 400-414页

作者： Yanyi ZHANG Ming KONG tianqi zhao Wenchen HONG Di XIE Chunmao WANG Rongwang YANG Rong LI Qiang ZHU Department of Psychology The Children’s HospitalZhejiang University School of MedicineNational Clinical Research Center for Child HealthHangzhou 310052China College of Computer Science and Technology Zhejiang UniversityHangzhou 310027China Hikvision Research Institute Hangzhou 310052China

Traditional diagnosis of attention deficit hyperactivity disorder(ADHD)in children is primarily through a questionnaire filled out by parents/teachers and clinical observations by *** is inefficient and heavily depends on the doctor’s level of *** this paper,we integrate artificial intelligence(AI)technology into a software-hardware coordinated system to make ADHD diagnosis more *** with the intelligent analysis module,the camera group will collect the eye focus,facial expression,3D body posture,and other children’s information during the completion of the functional ***,a multi-modal deep learning model is proposed to classify abnormal behavior fragments of children from the captured *** combination with other system modules,standardized diagnostic reports can be automatically generated,including test results,abnormal behavior analysis,diagnostic aid conclusions,and treatment *** system has participated in clinical diagnosis in Department of Psychology,The Children’s Hospital,Zhejiang University School of Medicine,and has been accepted and praised by doctors and patients.

关键词： Attention deficit hyperactivity disorder(ADHD) Auxiliary diagnosis Computer vision Deep learning BERT

GeAs2: A Ⅳ-Ⅴ Group 2D Semiconductor with Ultralow Thermal Conductivity and High Thermoelectric Efficiency

在线全文

学校读者我要写书评

暂无评论

GeAs2: A Ⅳ-Ⅴ Group 2D Semiconductor with Ultralow Thermal ...

第十三届全国量子化学会议

作者： tianqi zhao Yajing Sun Zhigang Shuai Dong Wang MOE Key Laboratory of Organic OptoElectronics and Molecular Engineering Department of Chemistry Tsinghua University

The successful demonstration of SnSe single crystals as promising thermoelectric materials highlights alternative strategies to nanostructuring for achieving high thermoelectric efficiency. It stimulates us to screen the periodic table for earth-abundant materials with layered crystal structure and intrinsically low thermal *** and GeAs are made from group Ⅳ and Ⅴ elements within the same period as selenium, and exhibit anisotropic and anharmonic bonding character similar to the Ⅳ-Ⅵ group compound SnSe. Here we present a theoretical investigation of the electronic structure of bulk and monolayer GeAs to predict its electrical and thermal transport *** features flat band and multi-valley convergence that give rise to large Seebeck coefficients. Remarkably, monolayer GeAs demonstrates anisotropic and amazingly low lattice thermal conductivity of 6.03 W m K and 0.68 W m K at 300 K in the a and b directions, respectively,which we attribute to its soft vibrational modes and anomalously high Grüneisen parameters. The ultralow thermal conductivity of 0.22 W m K at 900 K along the b axis leads to a high n-type thermoelectric figure of merit 5.7. These intriguing attributes distinguish GeAs from other 2D materials, and make it a promising candidate for environment-friendly thermoelectric applications.

关键词： Ⅳ-Ⅴ compound Germanium Diarsenide two-dimensional materials charge transport thermoelectrics

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

人工智能为3D影视行业注入新动力

科技导报 2018年第9期36卷 66-72页

作者：赵天奇北京聚力维度科技有限公司

介绍了3D视觉产生的原理和人类对3D视觉的探索历程，分析了3D内容的制作方式。伴随计算机视觉和人工智能技术发展，提出并研发了一种新的3D转制技术——人工智能2D转3D，该技术可根据2D图像自动生成3D内容，在无损品质下，将3D转制效率... 详细信息

介绍了3D视觉产生的原理和人类对3D视觉的探索历程，分析了3D内容的制作方式。伴随计算机视觉和人工智能技术发展，提出并研发了一种新的3D转制技术——人工智能2D转3D，该技术可根据2D图像自动生成3D内容，在无损品质下，将3D转制效率提升了1000余倍。并指出基于这项技术，可开发3D直播、3D浏览器等新应用，也有望彻底解决3D内容匮乏问题。

关键词： 3D影视深度估计人工智能2D转3D 3D内容制作

Classification of myocardial infarction based on ECG signals and multi-network stacking model

在线全文

学校读者我要写书评

暂无评论

Classification of myocardial infarction based on ECG signals...

响应面法优化高良姜二苯基庚烷类成分的提取工艺及抗氧化活性研究

第40届中国控制会议

作者： tianqi zhao Muqing Deng Peng Lin Jianzhong Wang Jiuwen Cao School of Automation School of Artificial Intelligence Hangzhou Dianzi University School of Automation Guangdong University of Technology

Myocardial infarction is one of the common cardiovascular diseases, and it also is a major cause of death and disability worldwide every year. Therefore, early detection of myocardial infarction is vital for patients. Deep learning algorithms have been used successfully for the recognition of myocardial infarction in recent years, but most of them are based on the segmentation of heartbeat signals and the single deep learning model. In this paper, we proposed a new myocardial infarction classification method based on an improved ECG feature extraction scheme and the multi-network stacking model. Firstly, the mean amplitude spectrum（MAS） is used in feature extraction to elaborate the frequency distribution difference of each wave among ECG signals. Secondly, due to the lack of time-domain features in the MAS map, we proposed a novel time-frequency feature fusion method. Finally, the time-frequency feature is fed to the multi-network stacking model for the classification of myocardial infarction. To improve the diversity of feature learning, this paper researches to stack different networks for learning the characteristic of the time-frequency feature. Meanwhile, we used the improved training methods to solve the problem of data imbalance. Experiments using the PTB database show that this feature extraction scheme and multi-network stacking model are effective for the classification of myocardial infarction.

关键词： ECG Myocardial infarction Feature extraction Deep learning

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

辽宁中医药大学学报 2025年第1期27卷 51-55,F0003页

作者：蒙宏杰陈美安黄燕琼陈卓尔江芳静覃金桥陈智兰赵天琪秦华珍广西中医药大学广西南宁530200 广西中医药大学第一附属医院广西南宁530023

目的响应面法优化高良姜二苯基庚烷类成分的提取工艺,并评价其体外抗氧化活性。方法采用二氯甲烷冷浸法提取高良姜二苯基庚烷类成分。在单因素试验基础上,以提取次数、提取时间、料液比为影响因素,以二苯基庚烷类成分提取率为指标,应用B... 详细信息

目的响应面法优化高良姜二苯基庚烷类成分的提取工艺,并评价其体外抗氧化活性。方法采用二氯甲烷冷浸法提取高良姜二苯基庚烷类成分。在单因素试验基础上,以提取次数、提取时间、料液比为影响因素,以二苯基庚烷类成分提取率为指标,应用Box-Behnken响应面法分析各因素对提取率的影响,得出高良姜二苯基庚烷类成分的最佳提取条件。以Fe3+还原能力和总抗氧化能力(ABTS法)评价高良姜二苯基庚烷类成分体外抗氧活性。结果最佳提取工艺为:提取时间56 h,料液比1∶12,提取次数2次,二苯基庚烷类成分提取率为2.883%,RSD为1.05%。高良姜二苯基庚烷类成分提取物浓度为0.25 mg/mL时,Fe3+还原能力和总抗氧化能力(ABTS法)都有最大值,分别为2.49 mmol·g^(-1)和2.10 mmol·g^(-1)。结论优化的高良姜二苯基庚烷类成分提取工艺稳定、可行、简便,所得提取物在体外表现出较好的抗氧化能力。

关键词：高良姜二苯基庚烷响应面抗氧化