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<正> 1 概述 再入遥测技术主要是指对飞行器(如导弹弹头)在再入大气层过程中的各种物理参数进行遥测的一项专门技术。它的基本原理与通常的遥测技术相同,相对而言,某些方面比一般遥测还困难得多。再入遥测是一个独立、强大的国家必须掌握的一门技术。 再入遥测技术具有一系列明显的特点,归纳起来主要有: (1)特快信号测量 特快信号泛指那些在很短瞬间突然产物的物理 相似文献
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HfGdO high-k gate dielectric thin films were deposited on Ge substrates by radio-frequency magnetron sputtering. The current transport properties of Al(Pt)/HfGdO/Ge MOS structures were investigated at room temperature. The results show that the leakage currents are mainly induced by Frenkel-Poole emissions at a low electric field. At a high electric field, Fowler Nordheim tunneling dominates the current. The energy barriers were obtained by analyzing the Fowler Nordheim tunneling characteristics, which are 1.62 eV and 2.77 eV for Al/HfGdO and Pt/HfGdO, respectively. The energy band alignments for metal/HfGdO/Ge capacitors are summarized together with the results of current-voltage and the x-ray photoelectron spectroscopy. 相似文献
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介绍数字正交上变频器AD9857的突出优点和工作原理,并分析其在基于DDS+DSP平台的全数字BPSK扩频调制中的应用。 相似文献
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