r-循环矩阵与矩阵的对角化

讨论了 r-循环矩阵的一些运算性质 ,并用它给出了 n阶方阵可对角化的一个充要条件     

Compensation of body shake errors in terahertz beam scanning single frequency holography for standoff personnel screening

In the terahertz(THz) band, the inherent shake of the human body may strongly impair the image quality of a beam scanning single frequency holography system for personnel screening. To realize accurate shake compensation in imaging processing, it is quite necessary to develop a high-precision measure system. However, in many cases, different parts of a human body may shake to different extents, resulting in greatly increasing the difficulty in conducting a reasonable measurement of body shake errors for image reconstruction. In this paper, a body shake error compensation algorithm based on the raw data is proposed. To analyze the effect of the body shake on the raw data, a model of echoed signal is rebuilt with considering both the beam scanning mode and the body shake. According to the rebuilt signal model, we derive the body shake error estimated method to compensate for the phase error. Simulation on the reconstruction of point targets with shake errors and proof-of-principle experiments on the human body in the 0.2-THz band are both performed to confirm the effectiveness of the body shake compensation algorithm proposed.     

矩阵函数的性质

研究矩阵函数的若干性质,推广了文献[1]的部分结果.     

介孔碳化钨纳米片团簇的制备及其电催化析氢性能

采用阳极氧化法与原位还原碳化法相结合,在电击穿条件下可控制备了具有介孔结构的碳化钨纳米片团簇(WC NFs).通过X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、N2吸附-脱附测试表征其物相、微观结构和孔径分布.在1 mol·L-1 H2SO4溶液中采用线性扫描伏安法、循环伏安法、计时电流法以...     

r—循环矩阵与矩阵的对角化

讨论了r-循环矩阵的一些运算性质，并用它给出了n阶方阵可对角化的一个充要条件。     

Laser-Chirp Controlled Terahertz Wave Generation from Air Plasma

We report the laser-chirp controlled terahertz(THz) wave generation from two-color-laser-induced air plasma.Our experimental results reveal that the THz wave is affected by both the laser energy and chirp,leading to radiation minima that can be quantitatively reconstructed using the linear-dipole-array model.The phase difference between the two colors,determined by the chirp and intensity of the laser,can account for the radiation minima.Furthermore,we observe an asynchronous variation in the ge...