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排序方式: 共有10000条查询结果,搜索用时 171 毫秒
51.
本征吸除硅片特性研究 总被引:1,自引:0,他引:1
本文描述硅本征吸杂片的特性参数,如吸除区宽度、洁净度,氧沉淀密度、MOS电容寿命,介绍了表面态密度及残余间隙氧浓度的检测方法和工艺对参数的影响及参数之间的内在联系,文章还实验论证了不同参数水平对器件成品率的影响,建立了以MOS电容寿命为主导的参数控制方法,利用本文提供的控制参数,可使CCD-512器件成品率达60%,以上优品率≥85%。 相似文献
52.
Zhang Xiumiao 《电子科学学刊(英文版)》1992,9(3):265-269
When a linear voltage ramp is applied to the gate of a MOS capacitor, a capacitancetime (C-t) transient is observed. The MOS capacitor is biased into strong inversion before applying the voltage ramp in order to eliminate
surface generation. FromC-t transient curve obtained experimentally the minority carrier generation lifetime in semiconductor can be determined. The
experimental results show that for the same sample the lifetimes extracted fromC-t curves under varying voltage sweep rates are close each other, and they are consistent with the lifetimes extracted by saturation
capacitance method. 相似文献
53.
对投电容器扰动识别和定位的方法进行了改进。针对其他此类方法的不足,比如在电压幅值低时投电容器扰动的识别、定位“可信度不高”等,文中通过提取小波变换的特定层的系数,对需要识别的电容器扰动的分解信号相对增强,而其他扰动的分解信号相对减弱,然后再提取熵特征值,结果表明它可以作为识别低电压时投电容器扰动的依据。在对电容器扰动进行定位时,参考了功率和能量定位法,并对其进行了改进。仿真分析证明,在电压幅值较低时,可以准确和可靠地对电容器扰动进行识别和定位。 相似文献
54.
Mitsuhiro Fukuta Tadashi Yanagisawa Hiroaki Iwata Kazutaka Tada 《International Journal of Refrigeration》2002,25(7)
This paper discusses the feasibility of a vapor compression/absorption hybrid refrigeration cycle for energy saving and utilization of waste heat. The cycle employs propane as a natural refrigerant and a refrigeration oil as an absorbent. A prototype of the cycle is constructed, in which a compressor and an absorption unit are combined in series. The performance of the cycle is examined both theoretically and experimentally. Although the solubility of the propane with the oil is not enough as a working pair in the absorption unit, the theoretical calculation shows that the hybrid cycle has a potential to achieve a higher performance in comparison with a simple vapor compression cycle by using the waste heat. In the experiment, the prototype cycle is operated successfully and it is found that an improvement of an absorber is necessary to achieve the good performance close to the theoretical one. The application of an AHE (absorber heat exchanger) can reduce the heat input to a generator. Further examinations on some other combinations of refrigerant/refrigeration oil and additives are desirable. 相似文献
55.
脉冲激光沉积SrBi2Ta2O9铁电薄膜电容特性研究 总被引:2,自引:0,他引:2
用PLD方法成功地制备了SBT铁电薄膜,并制作成Pt/SBT/Pt薄膜电容器。SBT薄膜的晶面取向以(008)和(115)为主。在5V电压下,极化反转,并且得到较饱和的电滞回线,剩余极化强度和矫顽电场分别为84μC/cm2和57kv/cm。IV特性测试显示两个对称的双稳峰,并得到零电压下,面积为314×104μm2,厚度为035μm的电容器,电容约为560pF,介电常数约为600。疲劳测试表明Pt/SBT/Pt具有优良的抗疲劳特性。 相似文献
56.
Novel hydrogen-bonded acidic fluorinated poly(amide-imide-silica) hybrid materials, FPAI-SiO2 (6E and 6F) series, were synthesized by a sol-gel process. The structures and spin relaxation of the hybrids were characterized by infrared (IR), and 29Si and 13C nuclear magnetic resonance (NMR) spectroscopy. The abundant Q4 structures implied that in free catalyst the degree of condensation of tetramethoxysilane was enhanced by hydrogen-bonded acidic fluorinated poly(amide-imide). The dynamics on the local mobility of the hybrids was investigated by the time constant for energy exchange between 1H and 29Si spin system (TSiH) and spin-diffusion path length (L) measurements. It was found that the faster TSiH of 6E and 6F hybrids compared with the previous study of similar 6C and 6D hybrids implied that 6E and 6F hybrids had more aggregated structures even though the organic terminal segment changed from rigid imide to more flexible amide. The interactions of the charge transfer between donor and acceptor molecules or π-π aromatic stacking may be the dominant factors to affect the structures of 6E and 6F hybrids. Moreover, M1 and D2 segments of 6F hybrids had the same level mobility and the mobility of the 6F hybrids was little improved as the soft and flexible 1,3-bis(3-aminopropyl)-tetramethyl-disiloxane segment was incorporated in the dense structures of 6F hybrids. All of the L values of 6E and 6F hybrids were on the scale of 3.5-4.0 nm. The result also suggested that 6E and 6F hybrids had similar denser structures as 6D hybrids. 相似文献
57.
In constructing hybrid systems, there is a need for a principled basis to determine the relative roles or functions of artificial neural network and symbolic approaches. The primary objective of the work to be reported is the construction of a conceptual and methodological framework that permits an iterative sequence in which a hybrid model predicts the basis of cognitive performance and an objective analysis of performance provides empirical data, evaluating (and thus constraining) the structure and processes of the model. In seeking a linkage between a hybrid model of cognition and human performance the concept of “semantic transparency” has been adopted, since it can be used in analyzing and describing both the chracteristics of a model of cognition and the processes underlying human performance. An overview of a specific, ”strong” hybrid architecture is presented. The characteristics of the virtual machines which compose it and the nature of their interaction are illustrated. An approach to the questions of evaluation is described based on empirical data obtained by brain monitoring of subjects during cognitive performance. 相似文献
58.
New accurate two-noded shear-flexible curved beam elements 总被引:2,自引:0,他引:2
There are two purposes of this work. One is to present two accurate two-noded finite elements which are derived from the
potential energy principle and the Hellinger–Reissner functional principle respectively. The second is to show the successful
application of the internal displacement parameters in developing a high-order related displacement-rotation interpolation
field. Because the derived interpolation field is capable of accurately modeling deformation modes in extreme thin curved
beams and nearly straight beams, both shear locking and membrane shocking are avoided. Several standard numerical tests display
superior behaviors of the present elements.
Received: 5 February 2002 / Accepted: 16 September 2002 相似文献
59.
60.
席静芳 《上海第二工业大学学报》2005,22(Z1):27-32
首先阐明有源滤波器的基本概念和传递函数,然后着重介绍具有低灵敏度的GIC型双运放电路和在较高频率时应用的开关电容滤波器,最后举例说明它们的应用. 相似文献