电子政务建设中需要注意的几个问题

结合作者多年来进行政务网络建设的体会 ,谈了电子政务建设中需要注意的六个问题 ,非常符合当前电子政务工作的实际情况     

光通信发展中重要的物理问题

阐述了光通信发展中所涉及的基本物理问题及对光通信发展的意义。重点分析了半导体物理效应 等在光通信中的应用,同时探讨了光纤传输中的损耗、色散和非线性光学效应等重要物理问题.     

光通信发展中重要的物理问题

阐述了光通信发展中所涉及的基本物理问题及对光通信发展的意义，重点分析了半导体物理效应等在光通信中的应用，同时探讨了光纤传输中的损耗、色散和非线性光学效应等重要物理问题。     

An Overview of Important Practical Aspects of Continuous-Time ARMA System Identification

The problem of estimating the parameters in continuous-time autoregressive moving average (ARMA) processes from discrete-time data is considered. Both direct and indirect methods are studied, and similarities and differences are discussed. A general discussion of the inherent difficulties of the problem is given together with a comprehensive study on how the choice of the sampling interval influences the estimation result. A special focus is given to how the Cramer-Rao lower bound depends on the sampling interval.     

Hall of fame for electrical engineers-Elihu Thomson

The Edison Medal was proposed in 1904 during the observance of the 25th anniversary of Thomas A. Edison's introduction of a successful electric lighting system. The medal was first given in 1909 with Elihu Thomson as the first recipient. He was cited for his "meritorious achievement in electrical science, engineering, and arts as exemplified in his contributions thereto during the past thirty years." Elihu Thomson was born 29 March 1853 in Manchester, England, although both his parents were Scottish. An economic depression caused the Thomson family to immigrate to the United States in 1858, where they settled in Philadelphia, PA. Elihu Thomson graduated from Central High School in 1870. Edwin J. Houston was a teacher at the school and subsequently became a partner with Thomson in various projects. Thomson and Houston designed and installed several small arc-lighting plants in Philadelphia during 1879. Thomson became a very prolific inventor and accumulated approximately 700 patents during his career. His patented inventions related to arc lighting became the basis for the formation of the American Electric Company in 1880.     

Special Aspects of the Kinetics of Reactive Ion Etching of SiO2 in Fluorine-, Chlorine-, and Bromine-Containing Plasma

Russian Microelectronics - The influence of the type of active gas and the ratio of the concentration of the components of the CF4 + Ar, Cl2 + Ar, and HBr + Ar mixtures on the parameters of the...     

研讨特种塑封管的再后固化效果

塑封器件的后固化，早巳被确认为固定工艺。通常是侧重于解决器件环境试验中存在的问题。我们意外发现它对于某种特殊器件有着神奇般的补救作用。     

图像表面特殊效果的研究

在研究了图像变换处理的特点后,提出了3种基于图像的变换方法,并根据不同的算法获得了3种不同的图像变换效果,最后结果表明,这3种算法能产生出比较满意的转换效果.     

Aspects of the Hartley transform

Known in the signal processing literature mainly as a computational technique, the Hartley transform has proven to possess attributes in the physical world of experiment, especially in optics and microwaves. The Fourier transform, which has constituted the standard approach to spectral analysis, is understood both in the domain of numerical analysis and in the world of natural phenomena, gaining its central significance from the ubiquity of sinusoidal natural behavior; it also gains appeal from the convenience offered by complex variable analysis, which is a basic part of technical education. Computers, however, prefer real numbers, an attribute that first opened a niche for the Hartley transform. As applications have multiplied, and others open up, it will be helpful to understand the Hartley idea from more than one point of view. Several topics, including multidimensional transforms, the complex generalization, and microwave phase measurement by amplitude measurement only, are discussed with the intention of throwing light on the numerical and physical relationships between the Hartley and Fourier transforms     

基于粒子系统的影视特效生成技术

为了增强影视特效绘制的真实感并保证实时性,提出一种基于粒子系统生成影视特效的技术.首先,针对影视特效的技术特点和特殊性要求,分析了粒子系统的结构和组成;其次,给出粒子系统模型在程序设计中的解决方案.实验结果表明,基于粒子系统能有效生成理想的影视特效结果.     

冷雾设备作为舞台演出特效的应用

冷雾设备作为舞台演出特效的应用越来越多。本文介绍了冷雾设备的系统构成、工作原理,结合河南电视台演播剧场的冷雾成功应用案例,阐述其雾效、花香、雾瀑的布置情况和需要重点控制的环节,并对干冰、烟机、冷雾三种雾效设施进行了对比分析,展现了冷雾作为舞台演出特效的优势,希望能提供经验与参考。     

驻极体电容传声器专用管特性分析

介绍了传声器管的结构及其基本原理,讲述了各部分的主要作用。重点研究了它的主要参数。在测试传声器管工作电流过程中,出现了以前未曾见到的一些异常现象。通过对其结构的改进和调整生产工艺,这个问题得以解决。但是它们之间是存在差别的。同时提高了传声器管的质量。     

非线性编辑中特效图文素材的应用

Cool 3D是一款特效图文制作软件，适用于动画片段、3D文字、图形等制作场合。Cool 3D中制作的特效素材应用于非线性编辑中，可以丰富素材的表现形式，提高节目编辑制作的整体质量。     

基于SED1336F芯片实现的多功能液晶显示模块

利用SEDl336F的显示电路实现了一系列特殊显示效果：多窗口快速显示与大图显示、窗口的平滑显示、窗口分区显示、窗口的多层叠加实现特殊效果(文图合并和透明色)等，以一种低成本、易控制的方法扩展了液晶显示屏的显示面积与显示层次。     

"频率差" 在影片立体声中的作用不可忽视

笔者从事电影技术工作多年,经常观看各类中外新旧影片,分析制作上的问题.随着科技的进步,一般而论,新片总是比旧片声像效果好.如在影片的配音效果上,当代数字声技术营造出的声场频响宽、动态大、保真度高,摄人心魄.但是在追求清晰的细节和丰富的色彩的同时,很多现代录音的层次感、立体感往往愈见其差,连那些利用高科技手段制作的进口大片也不例外.有人将其归结为数字声的固有现象,说服力不很强.     

立体电视特技镜头的实现方法及沉浸感分析

立体电视对图像性质进行根本改变,使观众的沉浸感显著提升。随着立体电视的快速发展,与传统电视特技手段的融合也不断加深,对立体电视特技镜头实现方法进行了详细分析,同时被各种实现方法对立体特技镜头沉浸感的影响进行分析比较。     

CCITT Recommendations--Network Aspects of the ISDN

This paper presents an outline of the key network standards issues addressed in CCITT as a necessary part of the development and implementation of ISDN. The results achieved in the 1981-1984 Study Period focused on ISDN network functional requirements, ISDN numbering plan, connection types to link ISDN interfaces across the network, and the relationship of the ISDN protocol model with the seven-layer ISO model. The additional network issues which must be resolved in the current (1985-1988) Study Period are identified and briefly discussed. Of particular interest are internetworking between ISDN and existing networks, numbering plan interworking, routing, and maintenance standards. The market success of ISDN depends upon early resolution of these network standards to meet the field trials scheduled for 1986-1988 and the first implementations expected in 1988-1990.     

Theory and practice of ionosphere study by Thomson scatter radar

The application of Thomson (or incoherent) Scatter observations to the study of the earth's ionosphere is described. Those aspects of theory of Thomson Scatter that have been put to practical use in ionospheric investigations are reviewed briefly and the type of radar equipment constructed for these investigations is discussed. Methods of measuring electron density, electron and ion temperatures, and ionic composition are then reviewed. Other applications of the technique--to the study of the neutral density and temperature of the upper atmosphere, drift motions, the flux density of fast photoelectrons, and the orientation of the earth's magnetic field--are also described.     

产品质量特性重要度分级在质量链中的重要作用

本文简单介绍了产品质量特性重要度的分级,重点阐述产品质量特性重要度分级在质量链中的重要作用.