Fabrication and structural characterization of large-scale uniform SnO<Subscript>2</Subscript> nanotube arrays by sol-gel method

Semiconductor SnO2 nanotube arrays were fabricated by sol-gel method based on highly ordered nanoporous anodic alumina membrane. Their microstructures were characterized by scanning electron microscopy,transmission electron microscopy, selective electron diffraction spectroscopy and X-ray diffraction. Results indicated that SnO2 nanotubes have a thickness of about 20-30 nm,and a diameter of about 100-200 nm. The length of the nanotubes is about 1 μn, XRD and SEDS indicated that these SnO2 nanotubes are polycrystalline.     

六自由度导弹制导系统的建模与仿真研究

战术导弹最优制导规律研究是提高导弹制导性能及精度的关键技术之一,需要进行理论研究和大量的仿真计算,以确定最优制导规律和控制系统参数。本文反导弹的空间运动状态用六自由度数学模型来描述,建立了六自由度的导弹运动模型、目标运动模型和相对运动模型等。研究出了进行战术导弹制导系统研究的六自由度仿真软件包,共由十多个模块组成。文中介绍了仿真软件的设计思想和程序结构。应用本仿真软件包可进行战术导弹制导规律专题研     

Synthesis of highly ordered SnO2／Fe2O3 composite nanowire arrays by electrophoretic deposition method

Highly ordered SnO2/Fe2O3 composite nanowire arrays have been synthesized by electrophoretic deposition method. The morphology and chemical composition of SnO2/Fe2O3 composite nanowire arrays are characterized by SEM, TEM, EDX, XPS, and XRD. The results show that the SnO2/Fe2O3 composite nanowires are about 180 nm in width and tens of microns in length, and they are composed of small nanoparticles of tetraganal SnO2 and rhombohedral α-Fe203 with diameters of 10-15nm. The SnO2/Fe2O3 composite nanowires are formed by a series of chemical reactions.     

肉鸡生长期内脏器官的生长分析

选艾维茵肉鸡商品雏２００只，按常规饲养管理，于初生和１，２，…，７周龄的周末，分性别各解剖８只，测量内脏器官重量、消化道重量及各部分长度，并进行与体重变化的回归分析．结果表明：内脏器官和消化道各部分的长度随体重同步变化，约在４周龄时内脏器官重超过整个生长期的平均数，且内脏器官重、消化道长度与鸡体重的幂回归的相关系数最高．