Simulation of dual transponder carrier ranging measurements

The most dominant error source for microwave ranging is the frequency instability of the oscillator that generates the carrier phase signal. The oscillator noise is very difficult to filter due to its extremely low frequency. A dual transponder carrier ranging method can effectively minimize the oscillator noise by combing the reference phase and the to-and-fro measurement phase from the same single oscillator. This method does not require an accurate time tagging system, since it extracts phases on the same satellite. This paper analyzes the dual transponder carrier ranging system by simulation of the phase measurements with comprehensive error models. Both frequency domain and time domain noise transfer characteristics were simulated to compare them with dual one-way ranging. The simulation results in the two domains conformed to each other and demonstrated that a high level of accuracy can also be achieved by use of the dual transponder carder ranging system, with relatively simple instruments.     

Ehrenfest’s theorem and nonclassical states of light 2. Dynamics of Nonclassical States of Light

The states of radiation of a single frequency and polarization propagating in free space are very conveniently represented by those of a quantum mechanical simple harmonic oscillator. This fact is exploited, together with the Ehrenfest theorem, to map the time evolution of the radiation to the dynamics of the oscillator. This enables a graphical comparison of the behaviour of classical and nonclassical states of radiation.     

一种分析LC振荡器的简便方法

提出把LC振荡器等效成负阻振荡器的新观点，并以电容三点式振荡器为例，利用物理概念导出了该振荡器的振荡条件和振荡频率的准确公式，并将结果与相关讨论进行比较。由此推断：所有LC振荡器均可等效为负阻振荡器，从而可方便得到振荡条件和振荡频率。该方法的特点是物理概念清晰，数学过程简便。     

谐振子任意次幂坐标算符矩阵元的相干态计算

利用相干态和正规乘积对谐振子任意次幂坐标算符X^^1。矩阵元进行了讨论，导出了计算X^^1矩阵元的一般公式，为处理谐振子的微扰问题提供了一种新的方法。     

弹簧振子问题探讨

在大学物理理论教学中,一般都在忽略弹簧质量的情况下,探讨弹簧振子的运动。而在实验教学中,为避免误差应当考虑弹簧质量。本文在考虑弹簧质量的前提下对弹簧振子的运动状况进行探讨。     

One-branch zero-IF wireless receiver topology with multiphase local oscillator

This paper proposes a one-branch zero-IF receiver topology, which samples the I and Q signals of the modulated RF carrier with one signal path by means of a multiphase local oscillator. The suggested one-branch re- ceiver works without matching problem, and it is also capable of cancelling out the flicker noise and DC-offset when the local oscillator is configured to the four-phase mode. The one-branch receiver saves much area and power com- pared with the traditional two-branch ones. All of the advantages above make the one-branch receiver topology a promising architectural candidate for low-power and low-cost RF CMOS receiver designs. Keywords： RF CMOS; zero-IF; flicker noise; image rejection; low-power; IQ matching     

电导电极边界效应及消除方法

以HI76303电导电极为例,从电学基本理论出发,研究了电导仪产生边界效应的原因,分析得出电极外部回路是产生边界效应的根本原因。电导仪测定的电导率结果为探头外部和探头内部溶液并联形成的电导率值;通过计算发现,电极敏感区域为直径约8 cm的椭球体。切断电极外部回路是消除边界效应的根本方法。以HI76303电导电极为基础,设计了一种改进型电极,计算表明,改进型电极工作时电势在激励电极之间均匀下降,电极外部溶液电势处处相等且为零,电极内部电流密度处处一致,电极外部电流密度为零。实验数据显示其有效地消除了边界效应。     

RC正弦波振荡器多功能实验电路

本文介绍一种RC正弦波振荡器多功能实验电路 ,对该电路进行组合变换 ,可获得相移RC、双TRC、文氏桥RC正弦波振荡器实验电路 .     

Terahertz磁波参量振荡器辐射THz波受温度的影响

从THz波增益、吸收系数、折射率几方面,讨论了THz电磁波参量振荡器辐射THz波受温度的影响,从而得到THz波增益随温度的升高而降低主要原因,是由于LiNbO3晶体中A1对称光学软模的拉曼活性降低所导致,这为今后太赫兹（THz）波参量振荡器的优化设计提供了参考价值。     

通过带有量子门的Aharonov-Casher环的自旋极化电导振荡

1 Introduction Since some experi ments made by Yacoby,et al.[1],and Schuster ,et al.[2],that first measured electrontransmission phase through a quantum dot ( QD) ,phase sensitive transports in open mesoscopic ringwith a QD have been extensively investiga…     

Conductance oscillations through an aharonov-bohm ring with a quantum gate

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关于摩尔电导定义的商榷

通过f(L,n,e)=0的导出,说明现行物理化学教材中关于摩尔电导定义的缺陷如同把速度常数和单位浓度时的反应速率混为一谈;并提出新的定义--单位梯度下单位线浓度(n/e)的电流强度叫摩尔电导.进而导出摩尔电导和当量电导是等同的物理量.     

Aharonov-Bohm环中磁场调制的极化电导振荡

Oscillations of the spin-polarized conductance controlled by a uniform magnetic field in a modified Aharonov-Bohm ring is studied with use of one-dimensional quantum wave guide.Its expression at zero temperature is obtained as a function of the flux penetrating the ring and the magnetic field.It has been found that there are two kinds of polarized conductance extremas for a given Fermienergy.As Zeemann energy of spin-polarized electron in the stub is varied.one kind of extrema exhibits continuous phase shift .However,another is locked at particular values of phase shift and it can only change abrouptly from a maxima to a minima when Zeemann crosses the level of the bound state of isolated stub.This is a different mehanism for abrupt change phase of conductance osillations.     

弹簧振子运动规律的总结

在普通物理实验中大都测量物理常数，实验内容基本属于对物理学定律进行检验。然而，实验不仅可以验证物理规律的正确性，而且还可以通过实验总结归纳，得到物体的运动规律。该文利用焦利秤研究弹簧振子，通过观察弹簧振子的运动，找到弹簧振子周期与其它物理量之间的数量关系，从而总结出弹簧振子的运动规律。     

含时阻尼谐振子的量子不变量算符及其本征值和本征函数

在适当的正则变换下,使含时阻尼谐振子纳入量子化轨道,并以此找到含时阻尼谐振子的不变量算符、不变量算符的本征值和本征函数。     

A SINGLE-CAVITY MULTIPLE-DEVICE HARMONIC OSCILLATOR AT W-BAND

The equivalent circuit of single-cavity multiple-device fundamentaloscillator(SCMDFO)and that of single-device harmonic oscillator(SDHO)proposed byK.Kurokawa and K.Solbach,respectively,are extended and applied to a single-cavitymultiple-device harmonic oscillator(SCMDHO).By means of describing the functions ofnonlinearity of Gunn diodes,the performances of the SCMDHO are analyzed.It is foundthat the voltage amplitudes are similar to those of SDHO,and the ratio of maximum pow-er of harmonic to that of fundamental is identical to that in SDHO when the devices havesame parameters.The harmonic injection locking behavior is also investigated.The injec-tion locking range is greater than that of SDHO if locking gain remains constant.A2-Gunn diode harmonic oscillator was designed.It delivers 30mW output power at103GHz.The mechanical tuning range is 4.15GHz when the output power remains morethan 10mW.The desired operation mode is stable.     

双波函数及其对一维谐振子的描述

本文应用双波函数理论于一维谐振子问题,显示了该理论包容经典力学的描述。     

行振荡电路若干问题的研究与实践

本文对行振荡电路的振幅平稳度和行频稳定度等方面,作了较深入的研究。     

珍稀濒危植物珙桐幼苗光合特征研究

为了研究珙桐叶片光合特征及其与环境因子的相互关系,对珙桐的引种驯化及资源保护提供重要的理论依据,采用美国产Li-6400型便携式光合测定系统,测定了珙桐叶片的光合作用日变化以及光响应曲线。结果表明：珙桐叶片的表观光量子速率0.09μmol/mol,暗呼吸速率1.31μmol.m-2.s-1,光补偿点22.01μmol.m-2.s-1,光饱和点465.18μmol.m-2.s-1;珙桐叶片的净光合速率、蒸腾速率和气孔导度的日变化曲线均呈双峰曲线,存在明显的＂午休＂现象;珙桐叶片净光合速率与气孔导度、蒸腾速率呈极显著正相关;气孔导度和蒸腾速率是影响珙桐光合速率的生理因子。