电磁波动方程的小波高频解

提出利用小波变换求解不连续性变系数电磁波动方程高频解的方法,解决了Fourier变换法无法解决的分层非均匀无耗介质中波的传播与反射向题。并用该方法计算了一个Fourier变换法能求解的特例,两种方法计算结果完全相同。

超高压电裂解辅助水代法提取油牡丹籽油的研究

研究油牡丹油的提取工艺并测定了油牡丹籽油的理化性质和脂肪酸组成。在单因素电场强度、电场频率、作用时间、液料比对提取率影响分析基础上,采用响应曲面法优化超高压超高频电裂解辅助水代法提取油牡丹籽油的最佳工艺参数为:电场强度400 V/cm,处理频27.12 MHz,处理时间5 min,液料比1.0 m L/g。在此条件下,油牡丹籽油提取率为96.4%.本研究所得的油牡丹籽油理化指标符合国际标准,不饱和脂肪酸高达92%,是很好的食用性油脂。

Surface wave attenuation based polarization attributes in time-frequency domain for multicomponent seismic data

In the paper, we propose a surface wave suppression method in time-frequency domain based on the wavelet transform, considering the characteristic difference of polarization attributes, amplitude energy and apparent velocity between the effective signals and strong surface waves. First, we use the proposed method to obtain time-frequency spectra of seismic signals by using the wavelet transform and calculate the instantaneous polarizability at each point based on instantaneous polarization analysis. Then, we separate the surface wave area from the signal area based on the surface-wave apparent velocity and the average energy of the signal. Finally, we combine the polarizability, energy, and frequency characteristic to identify and suppress the signal noise. Model and field data are used to test the proposed filtering method.

联合GNSS和SLR观测对地球自转参数的解算与分析

选取不同数量的IGS站,分别利用GPS和GPS+GLONASS观测数据计算ERP参数,并将结果和IGS公布值进行比较,分析测站数量增加和加入GLONASS观测数据对解算ERP参数的影响。此外,还利用GLONASS卫星的全部卫星激光测距(SLR)数据进行ERP参数解算,并将SLR结果和GNSS解算结果联合计算ERP,结果表明,联合SLR可改善GNSS数据解算ERP参数及高频ERP参数的系统性误差影响和稳定性。