Synthesis and magnetic properties of CuFe2O4 nanotube arrays

CuFe2O4 nanotube arrays with different outer diameters were synthesized in anodic aluminum oxide templates through sol-gel techniques followed by heating treatment processes. The morphology of the nanotube arrays was investigated by field emission scanning electron microscope and transmission electron microscopy, suggesting that the nanotube arrays are ordered and uniform. The X-ray diffraction results indicate that the crystal structure of the nanotube arrays is polycrystalline with a spinel-type structure. The measurements of magnetic properties indicate that CuFe2O4 nanotube arrays with outer diameter of 200 nm exhibit magnetic anisotropy with easy magnetization direction along the axis of nanotubes.     

非法进程监控的设计

针对学生上课运行无关程序(非法进程)的情况,设计实现了一个非法进程监控程序.程序采用C/S结构和多线程技术:一个线程(接收线程)及时接收和更新进程列表;另一线程(关闭线程)定时扫描本机中运行的进程,并关闭非法进程,从而实现了控制学生上机实验时玩游戏等现象的发生.