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Spin Noise Spectroscopy in N-GaAs:Spin Relaxation of Localized Electrons
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作者 马健 史平 +2 位作者 钱轩 尚雅轩 姬扬 《Chinese Physics Letters》 SCIE CAS CSCD 2017年第7期215-218,共4页
Spin noise spectroscopy (SNS) of electrons in n-doped bulk GaAs is studied as functions of temperature and the probe-laser energy. Experimental results show that the SNS signal comes from localized electrons in the ... Spin noise spectroscopy (SNS) of electrons in n-doped bulk GaAs is studied as functions of temperature and the probe-laser energy. Experimental results show that the SNS signal comes from localized electrons in the donor band. The spin relaxation time of electrons~ which is retrieved from the SNS measurement, depends on the probe light energy and temperature, and it can be ascribed to the variation of electron localization degree. 展开更多
关键词 Spin noise Spectroscopy in N-GaAs:Spin Relaxation of localized Electrons SNS SRT
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A PHEMT Based Wideband LNA for Wireless Applications 被引量:2
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作者 Muhammad Saad Khan ZHANG Hongxin +2 位作者 HE Pengfei Sulman Shahzad Rahat Ullah 《China Communications》 SCIE CSCD 2015年第10期108-116,共9页
This work is about the development of a super low noise amplifier with minimum power consumption and high gain for several wireless applications.The amplifier operates at frequency bands of 0.9-2.4 GHz and can be used... This work is about the development of a super low noise amplifier with minimum power consumption and high gain for several wireless applications.The amplifier operates at frequency bands of 0.9-2.4 GHz and can be used in many applications like Wireless local area network(WLAN),WiFi,Bluetooth,ZigBee and Global System for mobile communications(GSM).This new design can be employed for the IEEE 802.15.4 standard in industrial,scientific and medical(ISM) Band.The enhancement mode pseudomorphic high electron mobility transistor PHEMT is used here due to its high linearity,better performance and less noisy operation.The common source inductive degeneration method is employed here to enhance the gain of amplifier.The amplifier produces a gain of more than 17 dB and noise figure of about 0.5 dB.The lower values of S11 and S22 reflect the accuracy of impedance matching network placed at the input and output sides of amplifier.Agilent Advance Design System(ADS) is used for the design and simulation purpose.Further the layout of design is developed on the FR4 substrate. 展开更多
关键词 low noise amplifier phemt advanced design system wireless local area network global positioning system
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Outboard abnormal noise source localization method with curved surface projection based on time delay matching and weighting criterion
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作者 YU Wenjing HE Lin +2 位作者 CUI Lilin XU Rongwu LI Ruibiao 《Chinese Journal of Acoustics》 CSCD 2018年第4期448-462,共15页
An improved localization method consisting of "filtering-time delay estimationhyperbolic localization" is proposed. Combining the empirical mode decomposition(EMD)and time delay estimation method based on generali... An improved localization method consisting of "filtering-time delay estimationhyperbolic localization" is proposed. Combining the empirical mode decomposition(EMD)and time delay estimation method based on generalized average magnitude difference function,the original signals are decomposed into intrinsic mode function(IMF) components. The energy distribution criterion and spectrum consistency criterion are used to select the IMFs, which can represent the physical characteristics of the source signal. Several sets of signals are applied to estimate the time delay, and then a vector matching criterion is proposed to select the correct time delay estimation. Considering the hydrophones location, a shell model is established and projected to a plane according to the quadrant before the hyperbolic localization. Results of mooring and sailing tests show that the proposed method improves the localization accuracy,and reduces the error caused by time delay estimation. 展开更多
关键词 Outboard abnormal noise source localization method with curved surface projection based on time delay matching and weighting criterion
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Jump Type Cahn-Hilliard Equations with Fractional Noises 被引量:2
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作者 Lijun BO Kehua SHI Yongjin WANG 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 2008年第6期663-678,共16页
The authors explore a class of jump type Cahn-Hilliard equations with fractional noises. The jump component is described by a (pure jump) Lévy space-time white noise. A fixed point scheme is used to investigate t... The authors explore a class of jump type Cahn-Hilliard equations with fractional noises. The jump component is described by a (pure jump) Lévy space-time white noise. A fixed point scheme is used to investigate the existence of a unique local mild solution under some appropriate assumptions on coefficients. 展开更多
关键词 Cahn-Hilliard equations Fractional noises Lévy space-time white noise local mild solution
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