针对用户家中电器负荷识别分解问题提出了一种新的特征提取方法。对总线电流进行小波滤波处理，并根据周期差分的方法除去负荷暂态电流的背景电流，获取负荷投切后的暂态电流信号。对负荷的暂态电流进行S变换获取幅值谐波矩阵，并使用双向二维主成分分析［(2D)2PCA］对暂态电流的幅值谐波矩阵从行和列方向进行压缩以提取特征。使用支持向量机对样本特征集进行分类。对BLUED电力数据集的6种家用负荷进行识别，平均识别率为99.24%，最高达到100%。该方法与其他特征提取方法相比，对电气特性相似的负荷具有更高的识别率。

An efficient, stable diode-end-pumped simultaneous continuous-wave (CW) dual-wavelength laser operating at 1.319 and 1.338 μm in a Nd:YAG crystal has been demonstrated. A total output power of 6.3 W is achieved at an absorbed pump power of 15 W, with a slope efficiency of 43.5%. The instability of output power is less than 1%. With a type II critical phase-matched KTP crystal inserted into the cavity as frequency doubler, a maximum outputpower of 200 mW in red region is acquired. In addition, a six-wavelength laser operation at 1.319 μm, 1.338 μm, 1.356 μm, 659.5 nm, 669 nm, and 678 nm is observed.

We report a diode end-pumped continuous wave (CW) passively mode-locked Nd:YVO4 laser with a home-made semiconductor saturable absorber mirror (SESAM). The maximum average output power is 5.3 W at the incident pump power of 17 W, which corresponds to an optical-optical conversion efficiency of 31.2% and slope efficiency of 34.7%. The corresponding optical spectrum has a 0.2-nm full width at half maximum (FWHM), and the pulse repetition rate is 83 MHz.

We present a compact and high output power diode end-pumped Nd:YAG laser which operates at the wavelength of 1123 nm. Continuous wave (CW) laser output of 2.6 W was achieved at the incident pump power of 15.9 W, indicating an overall optical-optical conversion efficiency of 16.4%, and the slope efficiency was 18%.