台阶轴自由锻造工艺的计算模型

台阶轴是一类复杂锻件，合理的工艺计算模型是提高工艺设计水平的关键。本文提出三段式于模型以及虚拟轴节方法可以概括各种台阶轴，在此基础上可采用现代计算机及计算机优化技术，自动编制出最优的锻造工艺方案。     

线加权余量法及其在正交异性板弯曲分析中的应用

利用有限差分法对控制方程和边界条件进行半离散化,使其定义在一些离散线上,然后采用加权余量法求解。这就是本文提出的线加权余量法,也可称之为有限差分-加权余量分维耦合法。文中以正交各向异性薄板弯曲平衡问题为例推导了有关具体算式,给出了数值算例,说明了本文方法的有效性。     

简并量子拍频三能级系统中的光场压缩效应

本文讨论了V-型简并量子拍频三能级原子与单模相干辐射场相互作用时的动力学行为，并研究了光场的压缩效应。     

中央电视台第一个数字化演播室视频系统介绍

数字电视系统在提高图像质量方面已显示出极大的优越性。因此，世界各国电视台都已开始数字化的进程，中国也不例外。本文详细介绍了中央电视台第一个数字化演播室－８００ｍ＾２演播室的视频系统，包括视频系统数字信号格式的确定，主要设备的特点以及演播室数字视频系统的主要特点等，供广大同行参考。     

氩离子激光泵浦的掺钛宝石激光器研究

本文报导用氩离子激光连续泵浦的掺钛宝石(Ti~(3+),Al_2O_3)可调谐固体激光器的实验结果。泵浦光为全谱线,基模,激光器采用消象散的折叠谐振腔结构,获得基模激光输出功率0.67W,效率大于10.8％,可调谐范围为735nm～900nm。     

矩形件排样的一种优化算法

排样问题是一种总体资源分配问题，这里根据矩形件排样的工艺要求，提出了矩形件排样的一种近似算法，将一块板材分成三部分，每部分排一种零件，使得减料方便，提高了劳动生产率。     

超声波水位计在废桥墩上的应用及推广

利用废桥墩安装HW—1000UY—B超声波无线传输水位计,在平原河流水文站使用,获得成功,可推广应用.     

Performance of a combined eco-system of ponds and constructed wetlands for wastewater reclamation and reuse.

An on-site study on the operational performance of a combined eco-system of ponds and SF constructed wetland for municipal wastewater treatment and reclamation/reuse in Donging City, Shandong, China was carried out from January 2001 through October 2003. The removal efficiencies for various main parameters were: TSS 84.8 +/- 7.3%, BOD5 87.2 +/- 5.3%, CODCr 70.2 +/- 18.6%, TP 52.3 +/- 23.1%, and NH(3)-N 54.8 +/- 23.9% with effluent concentration of TSS 9.12 +/- 5.12 mg/l, BOD5 6.44 +/- 4.58 mg/l, CODCr, 42.8 +/- 6.7 mg/l, TP 0.94 +/- 0.27 mg/l and NH(3)-N 7.95 +/- 2.36 mg/l. In addition, the removal efficiencies for faecal coliforms and total bacteria were > 99.97% and > 99.998% respectively, which well meet Chinese National standards for effluent quality of municipal wastewater treatment plants. The composition of TSS was closely related to CODCr and BOD5 variations, and nitrification-denitrification is the major mechanism of nitrogen removal both in ponds and in wetlands. In addition, sedimentation also played an important role in the removal of TSS, nitrogen, phosphorus and BOD5. The removal efficiencies of various parameters, the number of species and biomass of biological community in the system increased gradually with the ecological maturation.     

Anomalous splitting in microwave mode-beating spectra of semiconductor ring lasers

Mode-beating spectra are investigated in long-perimeter (1.028 cm) monolithically integrated multiple-quantum-well semiconductor ring lasers. The beating line near 8 GHz is found to be split into two components. With increasing pumping current, a normal component shifts to lower frequencies, while an anomalous higher-frequency component shifts in the opposite direction. It is suggested the anomalous blue-shifting line results from power-induced perturbation of the refractive index in the vicinity of a strong mode.     

基于局部差别的形态学边缘检测方法研究

图像边缘特征是图像最基本也是最重要的特征之一.图像边缘特征的提取一直是计算机视觉和图像处理领域的经典研究课题,在精确制导武器的制导图预处理中有着广泛地应用.针对经典的边缘检测算子不能很好地提取噪声图像边缘这一问题,在数学形态学的基础上,提出了一种边缘提取方法.利用局部差别准则确定图像中受噪声影响的像素点,并对其进行形态学操作,滤除噪声,保存边缘.实验表明,该算法不仅具有很好的边缘提取能力,还具有很强的抗噪能力.说明了该算法的有效性和实用性.