大功率电感性负载的UPS不间断电源--金魁波电源的理论和实践

本文给出了UPS不间断电源电感性负载的理论分析和实验结果.根据这一理论已试制出专带电感性负载的UPS样机.     

双积分A/D转换器工作原理的演示实验装置的设计

选用基本元件设计一种实验电路装置，通过各关键点时序波形观测，展示双积分式A／D转换器工作原理。     

组合KdV方程的齐次平衡法求解

利用齐次平衡方法研究了组合KdV方程ut auux 6u^2ux uxxx=0的孤波解结构，并给出了它的扭结型孤波解。     

流体媒质界面上半波损失问题的讨论

本文主要是利用流体媒质界面处速度和能流的连续性边界条件,定量地分析,研究弹性纵波在界面处的半波损失问题。通过分析、研究,得出了弹性纵波有无半波损失的正确判据,及“入射波由波阻小的媒质射入波阻大的媒质,界面处反射波存在半波损失”不是普遍成立的结论。     

从权威到民主——简析二战后韩国政治变迁

韩国于1948年5月5日建国,并于同年8月15日建立了李承晚政府。由于李承晚政府统治腐败,引发了1961年5月16日的军人政变,从此韩国开始了军人权威统治。在朴正熙军人集团统治期间,韩国经济高速发展。经济的进步推动了社会全面进步,同时也动摇了权威统治的基础。在20世纪后期的民主化浪潮的推动下,韩国实现了由权威统治向民主的过渡。1992年底金泳三当选总统,标志着韩国民主化进程的完成。     

开发旅游资源振兴旅游经济

商丘是中华民族的发祥地之一,这里名胜古迹众多,有多处中国之最,旅游品味高。重点开发商丘旅游资源,使之形成商丘的“朝阳产业”、“无烟产业”,是推动商丘经济、社会快速发展、和谐发展的科学决策。采取国家、地方、部门、外商、个人共建方针,全面提升综合配套建设和服务水平,尽快形成旅游规模优势,是商丘旅游经济实现良好经济效益、社会效益的必由之路。     

Synthesized Multi-Method to Detect and Classify Epileptic Waves in EEG

In order to sufficiently exploit the advantages of different signal processing methods, such as wavelet transformation (WT), artificial neural networks (ANN) and expert rules (ER), a synthesized multi-method was introduced to detect and classify the epileptic waves in the EEG data. Using this method, at first, the epileptic waves were detected from pre-processed EEG data at different scales by WT, then the characteristic parameters of the chosen candidates of epileptic waves were extracted and sent into the well-trained ANN to identify and classify the true epileptic waves,and at last, the detected epileptic waves were certificated by ER. The statistic results of detection and classification show that, the synthesized multi-method has a good capacity to extract signal features and to shield the signals from the random noise. This method is especially fit for the analysis of the biomedical signals in biomedical engineering which are usually non-placid and nonlinear.     

Dynamic Responses Analysis of a Building Structure Subjected to Ground Shock from a Tunnel Explosion

Dynamic responses of a multi-storey building without or with a sliding base-isolation device for ground shock induced by an in-tunnel explosion are numerically analyzed. The effect of an adjacent tunnel in between the building and the explosion tunnel, which affects ground shock propagation , is considered in the analysis. Different modeling methods, such as the eight-node equal-parametric finite element and mass-lumped system, are used to establish the coupling model consisting of the two adjacent tunnels, the surrounding soil medium with the Lysmer viscous boundary condition, and the multi-storey building with or without the sliding base-isolation device. In numerical calculations , a continuous friction model, which is different from the traditional Coulomb friction model, is adopted to improve the computational efficiency and reduce the accumulated errors. Some example analyses are subsequently performed to study the response characteristics of the building and the sliding base-isolation device to ground shock. The effect of the adjacent tunnel in between the building and the explosion tunnel on the ground shock wave propagation is also investigated. The final conclusions based on the numerical results will provide some guidance in engineering practice.     

武夷山生态旅游开发的初步设想

在武夷山自然保护区开发生态旅游,是武夷山发展旅游的重要战略措施。本文分析了该区发展生态旅游的有利条件和重要意义,提出了生态旅游开发的方向。     

西方女性主义翻译理论的中国之旅

本文将参照赛义德“理论旅行”的观点,分析西方女性主义翻译理论在中国的理论旅行过程,并讨论西方女性主义翻译理论在中国旅行过程中遭遇的问题以及这一理论对中国翻译界的影响。