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采用溶胶-凝胶法制备掺镉镧钛酸铅(PCT,PCLT)纳米晶,分别用X射线衍射仪、透射电子显微镜、红外光谱仪和差热扫描量热分析仪对其晶化温度、结构、形貌特性及相变温度进行了分析测试。结果表明,PCLT系列纳米晶的晶化温度为500°C,500°C~850°C热处理2h得到的纳米晶粉的粒度大小为15nm~80nm,其铁电-顺电相转变温度为235°C。 相似文献
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半导陶瓷湿度传感器的组分分析 总被引:4,自引:2,他引:2
本文研究一种用ZrO2,SiO2,Nb2O5和P2O5为原料的半导陶瓷湿度传感器.它的组分是用扫描电子显微镜,X射线衍射仪和X射线能谱仪进行分析.几种氧化物粉末在高温下烧结成由许多微小晶粒组成的多孔半导陶瓷.晶粒周围环绕着Nb(0.2)Zr(0.8)O(2.1),ZrNb(14)O(32),ZrP2O7以及Nb(44)P2O(115)复合物.这些固溶体能够降低晶粒之间的电阻.大气水分子的吸附和毛细凝聚进一步加强了传感器电导. 相似文献
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着重讨论BaTiO3细粉体的晶相对X7R介质瓷的电气性能的影响。通过X射线衍射谱分析该细粉体的晶相结构,结果表明:立方相的BaTiO3介电常数很低;四方相的BaTiO3介电常数高,介质的电性能也好。所以我们用四方相BaTiO3的含量来衡量X7R介质瓷的质量。BaTiO3四方相含量越高,X7R介质瓷电性能越好。 相似文献
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第一套电镜Si(Li)X射线探测器已经制成,探测器包括灵敏面积为20mm ̄2Si(Li)晶体、低温场效应晶体管、光反馈前置放大器、具有7.5μ铍窗的低温装置和7.5升液氮杜瓦瓶。对 ̄(55)Fe5.9keV射线,能量分辨率为152eV。此外报道TRACOR电镜Si(Li)X射线探测器修理的结果,修理后能量分辨率为148ev,与原来的结果一样。每天正常的液氮消耗量少于1立升。 相似文献
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电镜硅锂X—射线能谱仪的制备及修理技术 总被引:2,自引:2,他引:0
第一套电镜X射线探测器已经制成,探测器包括灵敏面积为20mm^2Si(Li)晶体、低温场效应晶体管、光反馈前置放大器、具有7.5μ铍窗的低温装置和7.5升液氮杜瓦瓶。对^55Fe5.9keV射线,能量分辨率为152ev。此外报道TRACOR电镜Si(Li)X射线探测器修理的结果,修理后能量分辨率为148eV,与原来的结果一样。每天正常的液氮消耗量少于1立升。 相似文献
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碳钢表面弧光离子渗铝层组织的研究 总被引:1,自引:0,他引:1
本文采用加弧辉光离子渗金属技术在碳钢(10、60、T12)表面进行了弧光离子渗铝,利用扫描电镜(SEM)、透射电镜(TEM)、X-射线衍射仪以及X-射线微束衍射仪,对弧光离子渗铝层的组织进行了测定。 相似文献
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本工作用透射电镜和X-射线衍射仪对Pt/Ti爆炸复合双金属结合面组织和晶体结构进行了研究。发现界面上有一断续的微晶层,层厚在2μm范围内,层内的晶粒大小由几个nm ̄几百个nm,晶内有层错等晶体缺陷,该层由PtTi、Pt5Ti3、PtTi3等合金化合物组成。 相似文献
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Thomas M.Trexler 《半导体技术》2004,29(5)
From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test. 相似文献
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The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high. 相似文献
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The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation. 相似文献
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Today, micro-system technology and the development of new MEMS (Micro-Electro-Mechanical Systems) are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible. 相似文献
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Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers
A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it. 相似文献
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A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working. 相似文献
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《中国通信》2014,(7)
正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks 相似文献