检索结果-南通市图书馆

H_2S Gas Sensitivity of Nanocrystalline Tin Dioxide Doped with Ytterbium (Yb) and Praseodymium (Pr)

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2006年第A3期35卷 21-24页

作者： Fengmin Liu Xishuang Liang Yuehua He Biao Wang baofu quan College of Electronic Science and Engineering Jilin University Changchun 130012 China

The influence of Yb_2O_3 and Pr_2O_3 doping on electrical and gas sensing properties of tin dioxide was studied.A doping content of 0.5wt%～5wt% was investigated by mechanical *** significant improvement on sensitivity and selectivity to 200μg/g hydrogen sulphide gas has been achieved by 3wt% Pr_2O_3 and 5wt% Yb_2O_3 *** better response and revovery properties of Pr or Yb doped tin dioxide sensor for 200μg/g hydrogen sulphide gas were *** maximum sensitivity to H_2S gas is observed at about 120℃.Pr has stronger catalysis than Yb for H_2S reaction on SnO_2 surface.S~ 2-) was oxidized to S~ 6+) on the SnO_2 surface according to XPS.

关键词： ytterbium and praseodymium SnO2 gas sensor hydrogen sulphide

Study on Formaldehyde Gas Sensor Based on SnO_2 with La_2O_3-ZnO Doping

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2006年第A3期35卷 129-131页

作者： baofu quan Fengmin Liu Ruzheng Liu Lihua Chen Yuehua He Biao Wang College of Electronic Science and Engineering Jilin University Changchun 130012 China

SnO_2 nanpowder was prepared by sol-gel *** SnO_2 based formaldehyde sensor with the doping of La_2O_3 (5wt%)-ZnO(3wt%) was *** range of the detecting concentration for formaldehyde is from 10μg/g to 300μg/g at 140℃.The sensitivity (S=R_0/R_g) to 10μg/g formaldehyde is 2 and to 300μg/g formaldehyde is *** 0.4 nm molecule-sifter layer was coated on the surface of SnO_2 material,the result shows that the selectivity of the formaldehyde sensor is improved. The La_2O_3-ZnO doped SnO_2 sensor shows better stability during 60 days testing.

关键词： SnO2 formaldehyde sensitivity selectivity

Photoluminescence Characterization of NASICON Material

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2006年第A3期35卷 535-537页

作者： Yuehua He baofu quan Ying Wang Chuanhui Cheng Fengmin Liu Biao Wang College of Electronic Science and Engineering Jilin University Changehun 130012 China School of Materials Science and Engineering Dalian Jiaotong University Dalian 116028 China

Besides gas sensitivity,NASICON (Na super ion conductor) material has luminescence *** this paper,the photoluminescence properties of NASICON and doped-NASICON material are *** NASICON material was synthesized by conventional sol-gel process,and doped with Er_2O_3,Tm_2O_3,Dy_2O_3,CsCl by 1%,3%,5% (mass ratio),*** ultraviolet light (325 nm,He-Cd laser) excited luminescent emissions of the resulted powders are recorded *** in the 330 nm to 650 nm *** main peak of the pure NASICON is found at the wavelength of 474 nm (blue light),the transition energy is 2.616 *** luminescent intensity is weakened obviously after doping with Er_2O_3 and Tm_2O_3,but is increased after doping with Dy_2O_3 and 3% CsCl.

关键词： photoluminescence NASICON luminescent intensity wavelength

Fabrication and Characterization of NASICON-Based CO_2 Gas Sensor

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

稀有金属材料与工程 2006年第A3期35卷 132-135页

作者： Yuehua He baofu quan Biao Wang Fengmin Liu Kuixue Liu Fabin Qiu College of Electronic Science and Engineering Jilin University Changchun 130012 China

Tube-type CO_2 gas sensors based on NASICON (Na Super Ion Conductor) material were *** material was synthesized by conventional sol-gel method,and the resulted powders were characterized by *** tube-type CO_2 sensor was prepared with the sensing electrode Li_2CO_3-BaCO_3 binary carbonates in molar ratio 1:*** concentration of CO_2 range from 300μg/g to 3000μg/g,the sensitivity of the sensor was 62.3 mV/*** response and recovery time (90%)corresponding to the switching change between 300μg/g and 1000μg/g CO_2 were 20 s and 2 min,*** the sensing electrode was modified with binary oxides,the steady time of the sensor could be greatly reduced from 30 min to 5 min and the stability and humid-resistance of the sensor were improved.

关键词： NASICON CO2 gas sensor binary oxides Li2CO3-BaCO3

Timing of biomarker changes preceding Alzheimer's disease: for diagnosis, treatment or prevention?

在线全文

学校读者我要写书评

暂无评论

Science China Life Sciences 2025年第2期68卷 575-577页

作者： Meina quan Innovation Center for Neurological Disorders and Department of Neurology Xuanwu HospitalCapital Medical University National Medical Center for Neurological Diseases and National Clinical Research Center for Geriatric Diseases Center of Alzheimer's Disease Beijing Institute of Brain DisordersCollaborative Innovation Center for Brain Disorders

The pathophysiological and behavioural features of Alzheimer's disease(AD) have been extensively investigated in transgenic mouse models, including the temporal sequence of each pathophysiological change and behavioural abnormality, a summary of which was recently presented by our team in this Journal(Li et al.,2023). Nevertheless, studying such features and timings directly in human patients before symptoms occur is challenging.

关键词：

Photoluminescence Characterization of NASICON Material

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

稀有金属材料与工程 2006年第S3期 535-537页

作者： Yuehua He~1 baofu quan~1 Ying Wang~2 Chuanhui Cheng~1 Fengmin Liu~1 Biao Wang (1.College of Electronic Science and Engineering,Jilin University,Changchun 130012,China) (2.School of Materials Science and Engineering,Dalian Jiaotong University,Dalian 116028,China)

Besides gas sensitivity,NASICON （Na super ion conductor） material has luminescence *** this paper,the photoluminescence properties of NASICON and doped-NASICON material are *** NASICON material was synthesized by conventional sol-gel process,and doped with Er2O3,Tm2O3,Dy2O3,CsCl by 1%,3%,5% （mass ratio）,*** ultraviolet light （325 nm,He-Cd laser） excited luminescent emissions of the resulted powders are recorded *** in the 330 nm to 650 nm *** main peak of the pure NASICON is found at the wavelength of 474 nm （blue light）,the transition energy is 2.616 *** luminescent intensity is weakened obviously after doping with Er2O3and Tm2O3,but is increased after doping with Dy2O3and 3% CsCl.

关键词： photoluminescence NASICON luminescent intensity wavelength

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

新型CO_2传感检测仪的研制

仪器仪表学报 2006年第8期27卷 835-839页

作者：王彪刘奎学何月华陈丽华全宝富吉林大学电子科学与工程学院长春130012

本文以固体电解质CO2传感器为基础,设计制造了一种新型CO2传感检测仪。通过对传感器件特性的分析和测试,在接口电路上采用了“上电自校正”电路,以此来抑制器件本身所存在的输出信号对于时间的不规律变化的弊端;在数据处理上采用了新式... 详细信息

本文以固体电解质CO2传感器为基础,设计制造了一种新型CO2传感检测仪。通过对传感器件特性的分析和测试,在接口电路上采用了“上电自校正”电路,以此来抑制器件本身所存在的输出信号对于时间的不规律变化的弊端;在数据处理上采用了新式的“浮动查表法”来进一步剔除时间因素的影响。同时,对于温度和感应电场对系统稳定性的影响进行了讨论分析,给出了具体的解决方法。本仪器设计的特点是采用软硬件相结合的方法来弥补传感器自身所存在的不足,实际应用表明,该仪器具有很高的实用价值和广泛的应用前景。

关键词：上电自校正浮动查表法温度补偿静电屏蔽

在线全文

学校读者我要写书评

暂无评论

高选择性H_2S气敏元件及其特性

吉林大学自然科学学报 1989年第4期 75-78页

作者：全宝富孙良彦张清吉林大学电子科学系

本文报导了利用超微粒ZnO材料制作的气敏元件,对H_2S气体具有很高的灵敏度和良好的选择特性;在相同的测试条件下,元件对H_2、CH_4、C_2H_2、C_2H_4、CO、煤气、液化汽等无明显的气敏性。在较高的环境温度和湿度下,元件的气敏特性仍较稳定。

关键词：硫化氢气敏元件灵敏度氧化锌

NASICON固体电解质VOC气体传感器研究

在线全文

学校读者我要写书评

暂无评论

传感技术学报 2015年第12期28卷 1754-1759页

作者：钟铁钢蒋芳赵旺渠龙梁喜双全宝富辽宁工程技术大学电子与信息工程学院辽宁葫芦岛125105 吉林大学电子科学与工程学院长春130012

采用溶胶-凝胶法制备NASICON(钠超离子导体)和NiCr_xMn_(2-x)O_4材料,以NASICON为离子导电层,尖晶石结构材料NiCr_xMn_(2-x)O_4(x=0.6-1.4)为敏感电极构建混成电位型VOC气体传感器。结果表明,以NiCr0.6Mn1.4O4为敏感材料制作的气体传感... 详细信息

采用溶胶-凝胶法制备NASICON(钠超离子导体)和NiCr_xMn_(2-x)O_4材料,以NASICON为离子导电层,尖晶石结构材料NiCr_xMn_(2-x)O_4(x=0.6-1.4)为敏感电极构建混成电位型VOC气体传感器。结果表明,以NiCr0.6Mn1.4O4为敏感材料制作的气体传感器对正己醇,苯,甲醛和甲醇具有较好的响应。在350℃时,对100×10-6正己醇、甲醛和甲醇的EMF变化分别为116、73和60mV。对10×10^(-6)~300×10^(-6)正己醇的灵敏度可达到89mV/decade。另外,传感器具有良好的可再现性,较快的响应恢复速率以及较宽的测试范围。

关键词： NASICON 固体电解质混成电位 VOC 正己醇