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ZnO nanomaterials based surface acoustic wave ethanol gas sensor. PubMed
期刊论文 | 2012 , 12 (8) , 6505-9 | Journal of nanoscience and nanotechnology | IF: 1.149
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Abstract :

ZnO nanomaterials based surface acoustic wave (SAW) gas sensor has been investigated in ethanol environment at room temperature. The ZnO nanomaterials have been prepared through thermal evaporation of high-purity zinc powder. The as-prepared ZnO nanomaterials have been characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray Diffraction (XRD) techniques. The results indicate that the obtained ZnO nanomaterials, including many types of nanostructures such as nanobelts, nanorods, nanowires as well as nanosheets, are wurtzite with hexagonal structure and well-crystallized. The SAW sensor coated with the nanostructured ZnO materials has been tested in ethanol gas of various concentrations at room temperature. A network analyzer is used to monitor the change of the insertion loss of the SAW sensor when exposed to ethanol gas. The insertion loss of the SAW sensor varies significantly with the change of ethanol concentration. The experimental results manifest that the ZnO nanomaterials based SAW ethanol gas sensor exhibits excellent sensitivity and good short-term reproducibility at room temperature.

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GB/T 7714 Wu Y , Li X , Liu J H et al. ZnO nanomaterials based surface acoustic wave ethanol gas sensor. [J]. | Journal of nanoscience and nanotechnology , 2012 , 12 (8) : 6505-9 .
MLA Wu Y et al. "ZnO nanomaterials based surface acoustic wave ethanol gas sensor." . | Journal of nanoscience and nanotechnology 12 . 8 (2012) : 6505-9 .
APA Wu Y , Li X , Liu J H , He Y N , Yu L M , Liu W H . ZnO nanomaterials based surface acoustic wave ethanol gas sensor. . | Journal of nanoscience and nanotechnology , 2012 , 12 (8) , 6505-9 .
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Morlet小波对于压缩机故障信号的研究 PKU
期刊论文 | 2006 , (4) , 60-61,63 | 电气自动化
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Abstract :

针对目前压缩机故障信号分析中存在的问题,提出了用Morlet小波对故障信号进行提取和识别.Moorlet小波是一种连续小波,能够克服时域离散造成故障信号遗漏及尺度二进离散分割过于粗糙的问题,能够使故障信号中的时域和频域信息同时在二维及三维空间上被更加直观的呈现出来.文末在停车情况下,对压缩机故障进行检查,验证了Morlet连续小波在故障信号提取和识别中的可行性和正确性.

Keyword :

故障信号 Morlet连续小波 压缩机

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GB/T 7714 丁娜 , 关立行 , 文常保 . Morlet小波对于压缩机故障信号的研究 [J]. | 电气自动化 , 2006 , (4) : 60-61,63 .
MLA 丁娜 et al. "Morlet小波对于压缩机故障信号的研究" . | 电气自动化 4 (2006) : 60-61,63 .
APA 丁娜 , 关立行 , 文常保 . Morlet小波对于压缩机故障信号的研究 . | 电气自动化 , 2006 , (4) , 60-61,63 .
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Study of improving identification accuracy of carbon nanotube film cathode gas sensor EI SCIE Scopus
期刊论文 | 2005 , 125 (1) , 15-24 | SENSORS AND ACTUATORS A-PHYSICAL | IF: 1.363
WoS CC Cited Count: 25
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Abstract :

Ionization gas sensors need to combine with chromatograph and mass spectrograph to separate gas mixture; this results in huge, bulky architecture, high power consumption and risky high-voltage operation. Here we proposed using two-sensor array composed of two carbon-nanotube film cathode gas sensors with different gaps and using multi-information fusion technology to directly and precisely identify the gas mixture at atmospheric pressure without separating the mixture. Two-sensor array with different gaps were used, and experiments were conducted to obtain the original patterns (OPs) of the two sensors, viz. the relationship between the breakdown voltages and the gas concentrations of the two-gas mixture. The interpolation technology was used to improve OPs, and the neural network technology was used to precisely identify the two components without separating the mixture. This novel method greatly improved the performance of the gas sensor, and can be used to identify n-gas mixture (n > 2) with n-sensor array. (c) 2005 Elsevier B.V. All rights reserved.

Keyword :

qualitative analysis information process gas analysis carbon nanotube gas discharge sensor

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GB/T 7714 Zhang, Y , Liu, JH , Li, X et al. Study of improving identification accuracy of carbon nanotube film cathode gas sensor [J]. | SENSORS AND ACTUATORS A-PHYSICAL , 2005 , 125 (1) : 15-24 .
MLA Zhang, Y et al. "Study of improving identification accuracy of carbon nanotube film cathode gas sensor" . | SENSORS AND ACTUATORS A-PHYSICAL 125 . 1 (2005) : 15-24 .
APA Zhang, Y , Liu, JH , Li, X , Tang, XJ , Zhu, CC . Study of improving identification accuracy of carbon nanotube film cathode gas sensor . | SENSORS AND ACTUATORS A-PHYSICAL , 2005 , 125 (1) , 15-24 .
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Morlet小波对于压缩机故障信号的研究
期刊论文 | 2005 , (4) , 7-10 | 压缩机技术
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Abstract :

针对目前压缩机故障信号分析中存在的问题,提出了用Morlet连续小波对故障信号进行提取和识别.在停车情况下,对压缩机故障进行检查,验证了Morlet连续小波在故障信号提取和识别中的可行性和正确性.

Keyword :

故障信号 Morlet连续小波 压缩机

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GB/T 7714 丁娜 , 关立行 , 文常保 . Morlet小波对于压缩机故障信号的研究 [J]. | 压缩机技术 , 2005 , (4) : 7-10 .
MLA 丁娜 et al. "Morlet小波对于压缩机故障信号的研究" . | 压缩机技术 4 (2005) : 7-10 .
APA 丁娜 , 关立行 , 文常保 . Morlet小波对于压缩机故障信号的研究 . | 压缩机技术 , 2005 , (4) , 7-10 .
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声表面波式小波器件对奇异性信号的研究 CSCD PKU
期刊论文 | 2004 , (7) , 1000-1003 | 系统工程与电子技术
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Abstract :

在研究声表面波式Morlet小波器件具有进行小波变换、消除白噪声和奇异性信号识别功能的基础上,将该器件用于对奇异性信号的提取和分析.通过某一航空发动机的故障实例说明了这种器件不仅可以对工业环境噪声、传输和中间处理单元造成的干扰信号进行滤波,有效地提高分析信号的信噪比,而且也实现了对故障信号的连续小波变换,最终完成了对奇异性信号的提取和识别.

Keyword :

声表面波器件 Morlet小波 奇异性信号

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GB/T 7714 文常保 , 朱长纯 , 卢文科 et al. 声表面波式小波器件对奇异性信号的研究 [J]. | 系统工程与电子技术 , 2004 , (7) : 1000-1003 .
MLA 文常保 et al. "声表面波式小波器件对奇异性信号的研究" . | 系统工程与电子技术 7 (2004) : 1000-1003 .
APA 文常保 , 朱长纯 , 卢文科 , 刘君华 . 声表面波式小波器件对奇异性信号的研究 . | 系统工程与电子技术 , 2004 , (7) , 1000-1003 .
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碳纳米管的分子动力学模拟
期刊论文 | 2003 , (1) , 9-14 | 微细加工技术
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碳纳米管的纳米级尺寸在很大程度上限制了人们对它的了解、测试与观察,严重地影响了它的发展和应用.因此,必须有简单可行的方法来合理计算、测量碳纳米管的各种特性,计算机模拟无疑是研究这种特殊材料的极佳方法.采用分子动力学模拟[1]的方法,来模拟碳纳米管的物理特性.首先模拟了碳纳米管的热稳定性,发现单壁开口碳纳米管的热稳定性将随着管径的增大而变差,同时开口碳纳米管在真空中保持稳定的极限温度在3 000K左右;接着模拟了两根开口碳纳米管的碰撞过程以及成键情况,模拟结果表明在开口端的碳原子非常活跃,极易与其它活性原子成键并且形成新的分子结构,这预示了只要使用一些简单的切割和组合就可以用碳纳米管组成纳微机械;最后对碳纳米管轴承结构的研究显示出碳纳米管之间仅仅存在很小的范德华力,这种独特的特性预示着碳纳米管构成的纳微机械会有卓越的机械特性.

Keyword :

碳纳米管 分子动力学 模拟

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GB/T 7714 李琰 , 朱长纯 , 姚振华 . 碳纳米管的分子动力学模拟 [J]. | 微细加工技术 , 2003 , (1) : 9-14 .
MLA 李琰 et al. "碳纳米管的分子动力学模拟" . | 微细加工技术 1 (2003) : 9-14 .
APA 李琰 , 朱长纯 , 姚振华 . 碳纳米管的分子动力学模拟 . | 微细加工技术 , 2003 , (1) , 9-14 .
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MEMS薄膜中的残余应力问题
期刊论文 | 2003 , (10) , 30-34 | 微纳电子技术
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在制造微电子机械系统(MEMS)的器件的过程中,通常要进行高温的薄膜淀积或生长,因此薄膜中存在的残余应力很多情况下影响着器件结构的特性,有时甚至严重劣化器件的性能.本文以实例具体分析了薄膜残余应力的影响,并介绍了残余应力的起源、产生机制以及控制.

Keyword :

薄膜 残余应力 微电子机械系统

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GB/T 7714 朱长纯 , 赵红坡 , 韩建强 et al. MEMS薄膜中的残余应力问题 [J]. | 微纳电子技术 , 2003 , (10) : 30-34 .
MLA 朱长纯 et al. "MEMS薄膜中的残余应力问题" . | 微纳电子技术 10 (2003) : 30-34 .
APA 朱长纯 , 赵红坡 , 韩建强 , 崔万照 . MEMS薄膜中的残余应力问题 . | 微纳电子技术 , 2003 , (10) , 30-34 .
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平面薄膜场致发射的模型分析
期刊论文 | 2001 , (9) , 929-932 | 电子与信息学报
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该文系统地讨论宽带隙平面薄膜的场致电子发射(FEE)的机理.基本的理论模型是电子对表面势垒的隧穿效应,同时考虑到晶格的散射和薄膜势垒中微细贯穿通道的电子发射作用.分析结果表明,宽带隙平面薄膜结构用作场致电子发射阴极,具有发射电压的阈值低,发射电子的能量分布范围小等优点.另外这种结构制作简单、材料选择范围宽、理化稳定性好,是一种理想的场致发射电子源.

Keyword :

薄膜 场致发射 模型

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GB/T 7714 李德昌 , 杨银堂 , 刘广钧 et al. 平面薄膜场致发射的模型分析 [J]. | 电子与信息学报 , 2001 , (9) : 929-932 .
MLA 李德昌 et al. "平面薄膜场致发射的模型分析" . | 电子与信息学报 9 (2001) : 929-932 .
APA 李德昌 , 杨银堂 , 刘广钧 , 朱长纯 . 平面薄膜场致发射的模型分析 . | 电子与信息学报 , 2001 , (9) , 929-932 .
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Study of the emission performance of carbon nanotubes EI SCIE Scopus
期刊论文 | 2000 , 18 (6) , 2704-2709 | JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B | IF: 1.605
WoS CC Cited Count: 4
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The carbon nanotube has good field emission properties, so it has been used as the electron source on the field emission display panel. To obtain a high emission current, the electric field at the tip of the nanotube must be large enough. This article studies the variation of electric field with different types of nanotubes. The emission current of the nanotube is also calculated for various geometrical parameters of nanotubes. From the simulation results, the influence of the geometrical parameters on the emission performance of nanotubes is studied. (C) 2000 American Vacuum Society. [S0734-211X(00)03306-8].

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GB/T 7714 Lei, W , Wang, BP , Tong, LS et al. Study of the emission performance of carbon nanotubes [J]. | JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B , 2000 , 18 (6) : 2704-2709 .
MLA Lei, W et al. "Study of the emission performance of carbon nanotubes" . | JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B 18 . 6 (2000) : 2704-2709 .
APA Lei, W , Wang, BP , Tong, LS , Yin, HC , Tu, Y , Zhu, CC . Study of the emission performance of carbon nanotubes . | JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B , 2000 , 18 (6) , 2704-2709 .
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Influence of the fringe field and the field interaction on the emission performance of a diode emitter array EI SCIE Scopus
期刊论文 | 2000 , 451 (2) , 389-393 | NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | IF: 0.964
WoS CC Cited Count: 6
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Abstract :

In the held emitter array, there is a fringe field surrounding the emitter array. The fringe field and the interactive field between different tips will influence the emission uniformity of the emitter array. This paper studies the influences of the fringe field and the interactive field on the emission performance of a diode emitter array. The variations of the emission currents versus the width of the margin of the array are given. From these results, the influences of the fringe field on the emissions of the center tips and the corner tips are obtained. This paper also analyses the dependence of the fringe field and the interactive field on the cathode-anode distance and the tip-to-tip spacing. (C) 2000 Elsevier Science B.V. All rights reserved.

Keyword :

fringe field diode emitter array emission performance interactive field

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GB/T 7714 Wei, L , Wang, BP , Yin, HC et al. Influence of the fringe field and the field interaction on the emission performance of a diode emitter array [J]. | NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT , 2000 , 451 (2) : 389-393 .
MLA Wei, L et al. "Influence of the fringe field and the field interaction on the emission performance of a diode emitter array" . | NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 451 . 2 (2000) : 389-393 .
APA Wei, L , Wang, BP , Yin, HC , Wu, YX , Chang, CZ . Influence of the fringe field and the field interaction on the emission performance of a diode emitter array . | NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT , 2000 , 451 (2) , 389-393 .
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