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2009 International Conference on Applied Superconductivity and Electromagnetic Devices最新文献

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An automatic inspection method of welding precision for high voltage ceramic capacitor 一种高压陶瓷电容器焊接精度的自动检测方法
P. Chao, Xunbo Li, Guangxu Qin
Inspection of welding precision is important to ensure the quality of High Voltage Ceramic Capacitor (HVCC). The purpose of this paper is to propose an automatic inspection method which is used to check the parallelism and position after welding. The method is, firstly, capture images with the help of a CCD camera. Next, detect edge with Canny operator. Thirdly, use modified Hough transform to find circles for parallelism checking. Fourthly, execute the parallelism inspection in the way of comparing distance. Fifthly, use the least square method to ascertain circles for position checking. Last, execute position inspection in the way of intersecting circles. In experiments of three different sizes HVCC, the proposed method is proved to be very effective.
焊接精度检测是保证高压陶瓷电容器质量的重要环节。本文的目的是提出一种自动检测焊接后平行度和位置的方法。该方法首先利用CCD相机进行图像采集。接下来,用Canny算子检测边缘。第三,利用改进的霍夫变换求圆,进行并行性检验。第四,采用比较距离的方法进行平行度检验。第五,用最小二乘法确定圆进行位置校核。最后,采用交圆法进行位置检测。在三种不同尺寸的HVCC试验中,验证了该方法的有效性。
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引用次数: 0
Investigation of magnetic-field effects on water 磁场对水的影响研究
X. Pang, Bo Deng
The properties of water and its changes under actions of magnetic-fields are gathered by the spectrum techniques of infrared, Raman, visible, ultraviolet and X-ray lights, which can have an insight into molecular and atomic structures of water. We find that some properties of water are changed, a lot of new and strange phenomena are discovered after magnetization. We obtained that magnetized water has really magnetism, which is verified by a peak shift of X-ray diffraction of magnetized water +Fe2O3 hybrid relative to that of pure water +Fe2O3 hybrid, a saturation and memory effect. At the same time, the properties of infrared and ultraviolet absorptions, Raman scattering and X-ray diffraction of magnetized water are greatly changed relative to that of pure water, their strengths of peaks are all increased, the frequencies of some peaks do also shift, some new peaks, for example, 5198 cm−1, 8050 cm−1 and 9340 cm−1 occur at the temperature of 250 °C after water is magnetized. In the meanwhile, the magnetized effects of water relate to the magnetized time and the intensity of an externally applied magnetic-field and temperature of water, but they are not a linear relationship. We find also occurrences of a lot of new and unusual properties of magnetized water, for example, the six peaks in 3000–3800 cm−1 in infrared absorption, the exponential increase of ultraviolet absorption of wave with decreasing wavelength of light in the 200–300 nm, These results show that molecular structure of water is very complicated, which need study deeply.
通过红外、拉曼、可见光、紫外线和x射线等光谱技术,收集了水的性质及其在磁场作用下的变化,可以深入了解水的分子和原子结构。磁化后,水的一些性质发生了变化,发现了许多新的、奇怪的现象。通过磁化水+Fe2O3杂化体相对于纯水+Fe2O3杂化体的x射线衍射峰移、饱和效应和记忆效应验证了磁化水确实具有磁性。同时,磁化水的红外、紫外吸收、拉曼散射和x射线衍射等性质与纯水相比发生了较大的变化,峰的强度都有所增加,部分峰的频率也发生了移位,在250℃磁化后出现了5198 cm−1、8050 cm−1和9340 cm−1等新峰。同时,水的磁化效应与磁化时间、外加磁场强度和水的温度有关,但不是线性关系。我们还发现了磁化水的许多新的和不寻常的性质,例如,在3000-3800 cm−1的红外吸收中有6个峰,在200-300 nm的紫外吸收随波长的减小呈指数增长,这些结果表明水的分子结构是非常复杂的,需要深入研究。
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引用次数: 8
Experiment and simulation of transistor level fault model of IDDT test IDDT测试晶体管级故障模型的实验与仿真
Shuyan Jiang, Yong-Le Xie, Dajin Yu, Gang Luo
Fault and fault model is the fundament of IC diagnosis. Fault model based on IDDT and its test is the hot issue of modern IC fault diagnosis at present. Open and short fault models of inverter, NAND gate, and SRAM of CMOS technology were built in this paper. In the experiments, we selected the deep sub-micron of 0.18 μm CMOS technology to simulate with HSPICE. The simulations of IDDT waveforms and FFT transform waveforms of different fault models were made and the results were indicated that the IDDT test method can detect the open and short fault of CMOS devices effectively.
故障和故障模型是集成电路诊断的基础。基于IDDT的故障模型及其测试是目前现代集成电路故障诊断的热点问题。本文建立了CMOS技术逆变器、NAND门和SRAM的开路和短路故障模型。在实验中,我们选择了深亚微米0.18 μm的CMOS技术进行HSPICE模拟。对不同故障模型下的IDDT波形和FFT变换波形进行了仿真,结果表明IDDT检测方法能够有效地检测出CMOS器件的开路和短路故障。
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引用次数: 4
Substrates influence on the structure and static electromagnetic properties of FeCoB-SiO2 thin films 衬底对fecb - sio2薄膜结构和静电电磁性能的影响
L. Zhang, Z. W. Zhu, L. Deng
The microstructure and electromagnetic properties of FeCoB-SiO2 thin films which were deposited on different substrates (silicon, glass and Mylar) by using magnetron sputtering were studied. X-Ray Diffraction revealed that FeCo nanocrystalline only precipitated in FeCoB-SiO2 thin films on silicon and glass substrates, and the FeCoB-SiO2 films on Mylar substrate were amorphous. The surface images obtained by atomic microscopy (AFM) indicated that films on Mylar substrate with biggest particle size (about 120–150 nm), and agglomerated particle was discovered. The static electromagnetic properties, including resistivity and saturation magnetization for the films on different substrates, had also been investigated. The films sputtered on glass showed highest resistivity (2140 μΩcm) and a biggest saturation magnetization (4πMs = 13 kG).
研究了磁控溅射在不同衬底(硅、玻璃和聚酯薄膜)上沉积的fecb - sio2薄膜的微观结构和电磁性能。x射线衍射结果表明,FeCo纳米晶仅在硅和玻璃衬底上的fecb - sio2薄膜中析出,而在Mylar衬底上的fecb - sio2薄膜呈非晶态。原子显微镜(AFM)的表面图像表明,在Mylar衬底上发现了最大粒径(约120 ~ 150 nm)的薄膜和团聚颗粒。研究了薄膜在不同衬底上的静态电磁特性,包括电阻率和饱和磁化率。溅射膜的电阻率最高(2140 μΩcm),饱和磁化强度最高(4πMs = 13 kG)。
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引用次数: 2
Thin film thickness measurement using electron probe microanalyzer 用电子探针微量分析仪测量薄膜厚度
Libo Zhuang, S. Bao, Rong Wang, Shilan Li, Lili Ma, Dechun Lv
A non-destructive method for measuring the thickness of thin films deposited on a substrate has been developed with a conventional scanning electron microscope (SEM) equipped with ultra-thin window energy dispersive X-ray spectrometer (EDS). It is based physically on that the penetrant depth of electrons decreased as the accelerate voltage of incident electron lowered. By measuring the intensity ratio of an X-ray peak of the thin film to one of substrate at different accelerate voltage; the relation of intensity ratio of Is/If with electron energy is obtained. And when the penetrant depth of electrons is equal to the films thickness, change of the ratios both films and bulk standard is identical, theoretically. Then the thickness of thin films can be calculated by combining the expression of the experimental data and Sewell's formula. The thicknesses of FeCoSiB compound films on glass substrate were determined by this method. Comparing the results with the data taken from the stylus profilometry measurement, it shows that the method of measuring the thickness of thin films by EDS is reasonable and practicable.
利用传统扫描电子显微镜(SEM)和超薄窗口能量色散x射线能谱仪(EDS),建立了一种无损测量基底上沉积薄膜厚度的方法。它的物理基础是随着入射电子加速电压的降低,电子的渗透深度减小。通过测量不同加速电压下薄膜x射线峰与衬底x射线峰的强度比;得到了Is/If的强度比与电子能量的关系。当电子的渗透深度等于薄膜厚度时,薄膜和体积标准的比值变化在理论上是相同的。然后将实验数据的表达式与休厄尔公式相结合,计算出薄膜的厚度。用该方法测定了玻璃衬底上FeCoSiB复合薄膜的厚度。结果表明,利用能谱仪测量薄膜厚度的方法是合理可行的。
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引用次数: 15
The two dimensional eelectron gas in BST/Al0.3Ga0.7N/GaN double heterostructure BST/Al0.3Ga0.7N/GaN双异质结构中的二维电子气体
Y. Liu, Chuan-ren Yang, Jihua Zhang, Song Wu, Hongwei Chen
In this paper, we take account of spontaneous and piezoelectric polarization effect of BST and AlGaN. At the hetero-interface in BST/ Al0.3Ga0.7N /GaN double heterostructure, one-dimensional Poisson-Schrodinger equation using nonuniform mesh are solved self-consistently in dependence of the polarization and thickness of BST and the thickness of AlGaN barrier layer. BST/Al0.3Ga0.7N/GaN double heterostructure conduction band and the two-dimensional electron gas(2DEG) density are investigated. The results indicate that the 2DEG density of BST/Al0.3Ga0.7N/GaN is larger than that of Al0.3Ga0.7N/GaN, for a 8nm BST on AlGaN/GaN structure, the 2DEG density reached 1.85×1013 cm−2, which is 23% higher than that of AlGaN/GaN structure.
本文考虑了BST和AlGaN的自发极化效应和压电极化效应。在BST/ Al0.3Ga0.7N /GaN双异质结构的异质界面处,采用非均匀网格的一维泊松-薛定谔方程与BST的极化和厚度以及AlGaN势垒层厚度相关,得到了自一致的解。研究了BST/Al0.3Ga0.7N/GaN双异质结构导带和二维电子气密度。结果表明,BST/Al0.3Ga0.7N/GaN的2DEG密度大于Al0.3Ga0.7N/GaN,对于AlGaN/GaN结构上的8nm BST, 2DEG密度达到1.85×1013 cm−2,比AlGaN/GaN结构的2DEG密度高23%。
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引用次数: 0
An improved design of digital calibration arithmetic applied in pipeline ADC 一种应用于流水线ADC的数字校正算法的改进设计
Jinghe Wei, Liming Qian, Zongguang Yu, Jiannan Yao, Longxing Shi
Digital calibration arithmetic becomes more and more widely applied in pipeline ADC with high precision, the structure of pipeline ADC based on digital calibration is commonly 1.5bit/stage presently. 2bit/stage, the structure of which has strong superiority in power consumption and chip size, is adopted in this paper after analyzing the advantages and disadvantages of different kinds of structures. An improved digital calibration arithmetic is designed, which has solved the problem of accuracy of calibrating coefficients in present arithmetic and made the calibrated output data more accurate. The result indicates that the improved digital calibration arithmetic makes the system linearity get highly upgraded.
数字校准算法在流水线ADC中得到越来越广泛的应用,目前基于数字校准的流水线ADC结构一般为1.5位/级。在分析了不同结构的优缺点后,本文选择了在功耗和芯片尺寸上具有较强优势的2bit/stage结构。设计了一种改进的数字校正算法,解决了现有校正算法中校正系数的精度问题,使校正后的输出数据更加准确。结果表明,改进后的数字校正算法使系统线性度得到了很大的提升。
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引用次数: 2
Design of cold dielectric hts power cable 冷介质高压电力电缆的设计
Zhixuan Wang, J. Qiu, Shuhong Wang, W. Gong, H. Hong, B. Tian
This paper proposed a design methodology of cold-dielectric (CD) high temperature superconducting (HTS) power transmission cables. The methodology covers the effects of the electrical and mechanical properties of both insulation materials and HTS tapes; the dimensions of the conductor layers, insulation layers, shield layers, the annular cooling gap and the cryostat. The selection of insulation materials and the design of conductor and shield layers are different from the warm dielectric HTS power cable design. Design of a prototype of CD HTS power cable, rated 10kV/1500A, has been performed. Further verification has shown that the presented design method is correct and efficient.
提出了一种冷介质高温超导输电电缆的设计方法。该方法涵盖了绝缘材料和高温超导胶带的电气和机械性能的影响;导体层、绝缘层、屏蔽层、环形冷却间隙和低温恒温器的尺寸。绝缘材料的选择、导体和屏蔽层的设计与温介质高温超导电力电缆设计不同。设计了一种额定10kV/1500A的CD HTS电力电缆样机。进一步的验证表明,所提出的设计方法是正确和有效的。
{"title":"Design of cold dielectric hts power cable","authors":"Zhixuan Wang, J. Qiu, Shuhong Wang, W. Gong, H. Hong, B. Tian","doi":"10.1109/ASEMD.2009.5306692","DOIUrl":"https://doi.org/10.1109/ASEMD.2009.5306692","url":null,"abstract":"This paper proposed a design methodology of cold-dielectric (CD) high temperature superconducting (HTS) power transmission cables. The methodology covers the effects of the electrical and mechanical properties of both insulation materials and HTS tapes; the dimensions of the conductor layers, insulation layers, shield layers, the annular cooling gap and the cryostat. The selection of insulation materials and the design of conductor and shield layers are different from the warm dielectric HTS power cable design. Design of a prototype of CD HTS power cable, rated 10kV/1500A, has been performed. Further verification has shown that the presented design method is correct and efficient.","PeriodicalId":354649,"journal":{"name":"2009 International Conference on Applied Superconductivity and Electromagnetic Devices","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122750303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Solid-state synthesis and characterization of nanocrystalline rare earth compound under ultrasonication 纳米晶稀土化合物的超声固相合成与表征
Dao-hua Li
Under near ambient temperature and ultrasonication, the La(Oxin)3•3H2O (lanthanum 8-quinolinolate) nanocrystallite was synthesized by solid-state reaction. The solid phase was characterized by powder X-ray diffraction (XRD) and electron diffraction (ED). The particle size, its distribution, and morphology of the prepared nanocrystallite were observed by transmission electron microscopy (TEM). Results showed that the product was nanocrystallite with a uniform particle size and with an average size of about 50 nm, and the yield rate of nanocrystalline La(Oxin)3•3H2O is approximately 95.9 %. During the synthesis of La(Oxin)3•3H2O nanocrystallite, the types of factors influencing the final product under different solid-state reaction conditions such as reactant, changing the proportions of reactant, addition of inert substances, mixing of trace solvent or surfactant and time of porphyrizing was also observed.
在近室温和超声作用下,采用固相反应合成了8-喹啉酸镧(La(Oxin)3•3H2O)纳米晶。采用粉末x射线衍射(XRD)和电子衍射(ED)对其固相进行了表征。利用透射电镜(TEM)观察了制备的纳米晶的粒径、分布和形貌。结果表明,产物为粒径均匀的纳米晶,平均粒径约为50 nm,纳米晶La(Oxin)3•3H2O的产率约为95.9%。在合成La(Oxin)3•3H2O纳米晶的过程中,考察了在不同固相反应条件下,如反应物、反应物比例的改变、惰性物质的加入、微量溶剂或表面活性剂的掺入以及卟啉化时间等对最终产物的影响。
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引用次数: 0
A study of linear ultrasonic motor 直线超声电机的研究
Zelin Fu, Hui Guo
Ultrasonic motor is a novel actuator, which has been developing very fast since its appearance in 1970s. Many studies have been done, in both theoretic and practical fields. With design experience, review of linear ultrasonic motor drive mechanism and classification methods is outlined. The basic design means and general analysis ways are sum up. ANSYS FEM is a kind of analysis software. It affords much help for design and analysis of ultrasonic motor. The entire design process of LUSM and characteristic testing will be show up. For further study, a typical modeling method has been given.
超声电机是一种新型的驱动器,自20世纪70年代问世以来发展迅速。在理论和实践两方面都做了大量的研究。结合设计经验,综述了直线超声电机的驱动机构和分类方法。总结了基本设计方法和一般分析方法。ANSYS有限元分析软件是一种有限元分析软件。为超声电机的设计和分析提供了一定的帮助。将展示LUSM的整个设计过程和特性测试。为了进一步研究,给出了一种典型的建模方法。
{"title":"A study of linear ultrasonic motor","authors":"Zelin Fu, Hui Guo","doi":"10.1109/ASEMD.2009.5306683","DOIUrl":"https://doi.org/10.1109/ASEMD.2009.5306683","url":null,"abstract":"Ultrasonic motor is a novel actuator, which has been developing very fast since its appearance in 1970s. Many studies have been done, in both theoretic and practical fields. With design experience, review of linear ultrasonic motor drive mechanism and classification methods is outlined. The basic design means and general analysis ways are sum up. ANSYS FEM is a kind of analysis software. It affords much help for design and analysis of ultrasonic motor. The entire design process of LUSM and characteristic testing will be show up. For further study, a typical modeling method has been given.","PeriodicalId":354649,"journal":{"name":"2009 International Conference on Applied Superconductivity and Electromagnetic Devices","volume":"205 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127033952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
期刊
2009 International Conference on Applied Superconductivity and Electromagnetic Devices
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