利用光纤数字同步传送网2.048 Mbit/s支路传送高精度标准时间信号

首次提出一种利用光同步数字传送网的2.048Mbit/s信号传送高精度时间编码信号的方法和实验结果。它可以使整个通信网的交换机、计费系统、网管系统、基站控制器等设备实现与UTC的时间同步。目前的实验证明,时间同步的不确定度优于±5μs。     

基于μC/OS-Ⅱ操作系统的液晶驱动解决方案

介绍了一种基于μC/OS-Ⅱ操作系统的LCD驱动程序,给出了硬件结构和软件模块.采用文中提出的显示缓冲区 屏幕刷新的方法,完全能够实现静态文本与滚屏动画的显示功能.     

复杂形体目标激光散射特征测量系统的研制

复杂形体目标激光散射特征的测量系统中，利用反射式离轴光路满足了可见到远红外波段的测量需要，通过大孔径（250mm）物方远心接收光路实现了对实际远场的模拟测量，以光滑镀金球体作为标准器，可直接获得任意目标散射截面的绝对值。在0．6328、1．06和10．6μm三个波段针对标准器的实测结果表明，平均误差小于4．95％。     

Hermitian阵的 Hadamard积的Schur补的一些不等式（英文）

本文得到了正定Hermitian阵的Hadamard积的Schur补的一些不等式，进而，给出了他们的一些应用，这些改进了近期的一些结束．     

A Study on the Model of Forecasting System about the Actual Telephone Occupation in the Lead Development

ＡＳｔｕｄｙｏｎｔｈｅＭｏｄｅｌｏｆＦｏｒｅｃａｓｔｉｎｇＳｙｓｔｅｍａｂｏｕｔｔｈｅＡｃｔｕａｌＴｅｌｅｐｈｏｎｅＯｃｃｕｐａｔｉｏｎｉｎｔｈｅＬｅａｄＤｅｖｅｌｏｐｍｅｎｔ￥ＸｉｅＳｈｉｃｈａｎｇ；ａｎｄＸｉｅＸｕｅｍｅｉ（Ｄｅｐａｒｔｍｅｎｔｏ...     

XPS对离子交换法光色玻璃中银的状态研究

本文介绍利用ｘ射线光电子能谱分析仪（ＸＰＳ），对玻璃表面银的存在状态进行研究，实验结果表明银以Ａｇ＾０、Ａｇ＾＋、Ａｇ＾＋＋三种状态存在，而Ａｇ＾＋的存在有利于玻璃光色性的提高。文中并提出了在工艺过程中应采用惰性或弱氧化性气氛。     

基于零点的函数K图和dj图的转换

介绍了函数的最大项展开式和CRM展开式及其图形表示，提出函数K图和dj图的零点的概念，并以此为基础讨论了基于零点的函数K图和dj图之间的转换方法。     

原子吸收法在有机分析中的应用（Ⅵ）香烟中氢氰酸的分析

原子吸收法在有机分析中的应用（Ⅵ）香烟中氢氰酸的分析谢志海，郎惠云，高云（西北大学化学系，西安，７１００６９）关键词：氢氰酸，测定，原子吸收光谱香烟中的尼古丁，烟焦油等含氮有机物燃烧后将产生氢氰酸，吸入人体后极为有害。国外在这方面的研究始于七十年代，...     

The colloidal stability and core-shell structure of magnetite nanoparticles coated with alginate

The adsorption of alginate (Alg) onto the surface of in water dispersed Fe₃O₄ nanoparticles and zeta potential of alginate-coated Fe₃O₄ nanoparticles have been investigated to optimize the colloidal stability of Alg-coated Fe₃O₄ nanoparticles. The adsorption amount of Alg increased with the decrease of adsorption pH. The zeta potential of Fe₃O₄ nanoparticles shifted to a lower value after adsorption of Alg. The lower adsorption pH was the lower zeta potential of Fe₃O₄ nanoparticles became. The Alg-coated Fe₃O₄ nanoparticles were found to be stabilized by steric and electrostatic repulsions. Those prepared at pH 6 were not stable around pH 5, and those prepared at pH 4 became unstable at pH below 3.5. Alg of M_w 45 kDa was a little bit more adsorbed onto nanoparticles surface than that of M_w 24 kDa. An average Fe₃O₄ core size of 9.3 ± 1.7 nm was found by transmission electronic microscopy. An average hydrodynamic diameter of 30-150 nm was measured by photon correlation spectroscopy. However, an average core size of 10 nm and an average hydrodynamic diameter of 38 nm were estimated from the magnetization curve of the concentrated magnetic fluids (MFs). The maximum available saturation magnetization of MFs was about 3.5 kA/m.     

Measurement of small-signal and large-signal responses of packaged laser modules at high temperature

In this paper, the pulsed injection method is extended to measure the chip temperature of various packaged laser modules, such as the DFB laser modules, the FP laser modules, and the EML laser modules. An optimal injection condition is obtained by investigating the dependence of the lasing wavelength on the width and period of the injection pulse in a relatively wide temperature range. The small-signal frequency responses and large-signal performances of packaged laser modules at different chip temperature are measured. The adiabatic small-signal modulation characteristics of packaged LD are first extracted. In the large-signal measurement, the effects of chip temperature, bias current and driving signal on the performances of the laser modules are discussed. It has been found that the large-signal performances of the EML modules depend on the different red-shift speeds of the DFB and EAM sections as chip temperature varying, and the optimal characteristics may be achieved at higher temperature.