星载极化相关型全极化微波辐射计天线交叉极化校正技术(I): 天线温度方程推导

星载极化相关型全极化微波辐射计是一种新型空间被动微波遥感仪器, 为海面风场等海洋大气环境参数的遥感探测提供了重要技术途径. 天线交叉极化校正是其数据预处理算法的重要环节. 本文针对星载极化相关型全极化微波辐射计天线交叉极化校正需求, 以极化相干检测理论为基础, 结合Stokes参数的定义, 自主推导了其适用的全极化天线温度方程. 该方程针对四个Stokes参数天线温度, 引入了Stokes参数之间交叉极化的振幅和相位, 并考虑了极化旋转角对天线方向图计算的影响. 最后, 建立了天线扫描波束与地球场景的几何对应关系, 对天线温度方程中各参数的确定方法进行了探讨. 全极化天线温度方程的建立为进一步开展星载极化相关型全极化微波辐射计天线交叉极化校正奠定了基础. 关键词： 全极化微波辐射计 天线交叉极化 天线温度方程 相干检测     

全极化微波辐射计姿态对观测亮温的影响及消除

针对全极化微波辐射计精确探测的需求, 研究了辐射计姿态对于观测亮温的影响以及亮温误差校正. 建立了姿态偏移与观测入射角以及极化旋转角的关系, 模拟了观测亮温随观测入射角以及极化旋转角波动的变化; 仿真了姿态偏移情况下的辐射计原始观测亮温;运用一种基于辐射传输模型的姿态补偿方法, 以垂直极化亮温和第三Stokes参数亮温为例, 对原始观测亮温展开误差校正. 研究显示, 该方法能够有效去除辐射计姿态偏移对观测亮温造成的影响, 校正结果满足辐射计数据预处理的误差精度要求. 关键词： 全极化微波辐射计 Stokes参数 观测入射角 极化旋转角     

Magnetization of an electron plasma by microwave pulses: Experiment to detect the longitudinal vacuum fieldB (3)

By solving the relativistic Hamilton-Jacobi equation of one electron in classical, circularly polarized, electromagnetic radiation, it is shown that the orbital electronic angular momentum is induced and governed entirely by the novel longitudinal vacuum fieldB ⁽³⁾. The presence of this field in the vacuum is detectible easily in principle by measuring its characteristicsquare root power density dependence using megawatt microwave pulses to magnetize an electron plasma set up in an inert gas such as helium.     

Brief comment on W. S. Warren et al II: Optical NMR and the B(3) field

It is pointed out that the only possible artifact, free opticalNMR (ONMR) shift of up to 0.1Hz reported by Warrenet al. [1] is the same precisely, 0.1Hz, as that predicted byB ³ theory. However, the great majority of the data by Warrenet al. are almost completely artifactual and cannot be used to discriminate between differentONMR mechanisms with any objectivity. Some references toB ³ theory andrecent ONMR data uncited by Warrenet al. are pointed out, data which show that the Warren group–s failure to see very well known [2,3] polarization-dependent effects of irradiation inNMR is a major design failure, not one of theory.     

ß-Correction spectrophotometry and its application to determination of a trace metal and its chelate composition: Cd(II) with dithizone

Huaibei Environmental Monitoring Center, Huaibei, Anhui Province, 235000, P. R. China. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 6, pp. 76–80, November–December, 1995.     

H-theorem for the (modified) nonlinear Enskog equation

We construct anH-function suitable for a system of dense hard spheres satisfying the (modified) nonlinear Enskog equation and we show that _t H 0. The equality sign holds only when the system has reached absolute equilibrium, in which caseS=– k_B H becomes the exact equilibrium entropy of the hard-sphere fluid.     

Cs2 NaMF6(M=Al,Ga):Cr3+络合分子体系局域结构和基态分裂的理论研究

采用双自旋轨道耦合系数模型并结合完全能量矩阵的方法对Cs₂NaMF₆(M=Al, Ga):Cr³⁺ 体系中Cr³⁺ 离子的基态分裂和局域结构进行了研究.通过模拟光谱和EPR谱确定了Cr³⁺ 取代 M³⁺ 形成的两种占位结构的畸变角,发现用双自旋轨道耦合系数模型与单自旋轨道耦合系数模型计算出的畸变角Δθ存在较大的差异.这表     

The evans-vigier field,B (3): Derivation of the de Broglie matter-wave equation from the Hamilton-Jacobi equation

The emergence of the Evans-Vigier fieldB ⁽³⁾ of vacuum electromagnetism has been accompanied by a novel charge quantization condition inferred from 0(3) gauge theory. This finding is used to derive the de Broglie matter-wave equation from the classical Hamilton-Jacobi (HJ) equation of one electron in the electromagnetic field. The HJ equation is used with the charge quantization condition to show that, in a perfectly elastic photon-electron interaction, complete transfer of angular momentum occurs self-consistently, and the electron acquires the angular momentum of the photon. In this limit the electron travels infinitesimally near the speed of light, and its concomitant electromagnetic fields become indistinguishable from those of the uncharged photon. This result independently proves the validity of the charge quantization condition and demonstrates unequivocally the existence of the vacuum fieldB ⁽³⁾.     

A density-functional theory for (BAs)n clusters (n=1 14): structures, stabilities and electronic properties

This paper investigates the lowest-energy structures,stabilities and electronic properties of (BAs) n clusters (n=1-14) by means of the density-functional theory.The results show that the lowest-energy structures undergo a structural change from two-dimensional to three-dimensional when n=4.With the increase of the cluster size (n 6),the (BAs) n clusters tend to adopt cage-like structures,which can be considered as being built from B 2 As 2 and six-membered rings with B-As bond alternative arrangement.The binding energy per atom,second-order energy differences,vertical electron affinity and vertical ionization potential are calculated and discussed.The caculated HOMO-LUMO gaps reveal that the clusters have typical semiconductor characteristics.The analysis of partial density of states suggests that there are strong covalence and molecular characteristics in the clusters.     

Form-preserving Transformations for the Time-dependent Schrödinger Equation in (n + 1) Dimensions

We define a form-preserving transformation (also called point canonical transformation) for the time-dependent Schrödinger equation (TDSE) in (n+1) dimensions. The form-preserving transformation is shown to be invertible and to preserve L ²-normalizability. We give a class of time-dependent TDSEs that can be mapped onto stationary Schrödinger equations by our form-preserving transformation. As an example, we generate a solvable, time-dependent potential of Coulombic ring-shaped type together with the corresponding exact solution of the TDSE in (3+1) dimensions. We further consider TDSEs with position-dependent (effective) masses and show that there is no form-preserving transformation between them and the conventional TDSEs, if the spatial dimension of the system is higher than one.