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1999年是我国改革开放和社会主义现代化建设承前启后关键的一年,也将是我们党和国家历史上具有特殊意义的一年,我们将迎来建国五十周年大庆和澳门回归祖国。在这春暖花开的时节,中国电信河北省移动通信传来喜讯—移动电话用户突破100万,这是河北移动通信发展史上的又一个里程碑。 相似文献
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提出了依据外测数据频带特性分析小波分解随机误差的分离方法。采用小波分解得到的细节分量逼近外测数据的随机误差,利用随机误差与其他成分之间的频带间隔确定最佳分解层数,重构细节分量直接得到随机误差。该方法简单易用,避免构建模型和间接分离方法引入的间接误差,利用计算机仿真验证了方法的有效性。 相似文献
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本探讨了一种实现对双模波色,爱因斯坦凝聚(BEC)中纠缠态控制的方案。通过应用外磁场,该粒子数空间的能级将会交叉。如果此时给它加上控制外场,就可以把一种量子态转化为在该空间中的任意量子态。 相似文献
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在Rn有界域上考虑一类带有非线性迁移项的平均曲率型方程div{σ(| Δu|2) Δu}+b(u)· Δu=0的第一类初边值问题.主要得到了弱解的存在性,并且给出了解的熄灭性质及解的L∞估计. 相似文献
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Ultra-low temperature radio-frequency performance of partially depleted silicon-on-insulator n-type metal-oxide-semiconductor field-effect transistors with tunnel diode body contact structures
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Radio-frequency(RF) characteristics under ultra-low temperature of multi-finger partially depleted silicon-oninsulator(PD SOI) n-type metal-oxide-semiconductor field-effect transistors(nMOSFETs) with tunnel diode body-contact(TDBC) structure and T-gate body-contact(TB) structure are investigated in this paper.When operating at 77 K,TDBC device suppresses floating-body effect(FBE) as well as the TB device.For TB device and TDBC device,cut-off frequency(f_T) improves as the temperature decreases to liquid-helium temperature(77 K) while that of the maximum oscillation frequency(/max) is opposite due to the decrease of the unilateral power gain.While operating under 77 K,f_T and f_(max) of TDBC device reach to 125 GHz and 77 GHz,representing 8%and 15% improvements compared with those of TB device,respectively,which is mainly due to the lower parasitic resistances and capacitances.The results indicate that TDBC SOI MOSFETs could be considered as promising candidates for analog and RF applications over a wide range of temperatures and there is immense potential for the development of RF CMOS integrated circuits for cryogenic applications. 相似文献
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