基于单片机的艺术彩灯系统设计

本文设计了一种新型的艺术彩灯控制系统,该系统使用单片机作为控制核心,采用了PWM脉宽调制技术。在系统硬件电路中增加了过零检测,利用三极管电路控制彩灯颜色的变化和组合。改进了传统艺术彩灯制作工艺要求严格,色彩变化单一的缺点。通过实验,该系统运行稳定,易于扩展。     

东周时期管子的经济思想

东周时期一向被认为是我国古代历史文明的光辉时代。由于当时社会大变革， 在政治思想领域出现了许多学派， 各自著书立说， 互相进行激烈争辨， 历史上称为百家争鸣。许多政治家的经济思想是很卓越的， 对后世影响很大。本文重点评述管子的经济思想     

浅谈建筑结构中如何应用不锈钢

钢结构体系早已应用于我国的建筑业,但应用于住宅建造,在我们国家发展还比较缓慢。结合实际,针对建筑结构设计中如何应用钢结构进行了探讨。     

隐秘重负下的疯狂与毁灭——《雷雨》悲剧根源新探

关于《雷雨》的社会问题剧、伦理情爱悲剧、命运悲剧等等各种解释不一而足,但似乎都未触及悲剧的本质。品读、观赏这部剧的时候,实际上也是作者为我们抽丝剥茧,将秘密逐次揭开的过程。隐秘重负下的疯狂与毁灭或许成为《雷雨》悲剧的终极根源。     

南水北调中线水源地生态与经济系统动态分析——以汉中市为例

把生态与经济系统耦合类型划分为生态良好经济发达型、生态良好经济欠发达型、生态脆弱经济发达型、生态脆弱经济欠发达型四种。基于生态足迹理论,构建了生态资本效用指数、生态&经济协调指数,对南水北调工程水源地汉中市1990～2009年生态经济系统运行态势进行了动态分析。结果如下:生态资本供需变化较大:1993年以前为生态盈余,1994～2001年为基本持平,2002～2009年为轻度赤字;生态压力逐渐增大,由1990年的0.74提高到2009年的1.15;2009年的生态资本转换效用是1990年的1.82倍,同期生态与经济协同发展指数提高了2.01倍。研究表明,汉中市生态与经济系统目前属于生态良好经济欠发达型。据此,提出了生态资源经济化的路径与建议。     

《沈阳工程学院学报》（自然版）发展现状分析

从影响因子、总被引频次、作者层次、发稿情况四个方面，对《沈阳工程学院学报》（自然版）与辽宁省内其他同类几家学报进行了比较，发现目前学报存在缺乏高质量稿源、高水平作者等问题。为此，提出提升学报质量的措施：加强特色栏目建设，吸引高水平稿件；开拓作者资源，建立稳定的作者队伍；扩大稿源，加强稿件规划；提高编辑素质，加强编辑队伍建设；坚持严格的审稿程序和审稿机制，提高编校质量。     

液晶电视动态LED背光源技术及其应用

目前LED的电光效率还不够高,亮度固定的LED背光源影响到显示图像的画质不能进一步提高,而且耗能发热而影响产品可靠性。本文研究的基于FPGA技术的分区动态控制LED背光源技术,其动态对比度特性明显的提高了液晶图像画质,大大的降低了液晶显示器(电视机)的实际使用功率,为提高画质和节能做出进一步的贡献。     

声光双控节能灯电路设计

为解决工厂长明灯现象,设计了一种声光双控节能电路供楼道照明灯用,其功能:夜间有人上下楼时,照明灯自动点亮,灯亮后延时2～3分钟,会自动熄灭;白天照明灯受人走动的控制,灯不会点亮。整个电路由电源电路,放大电路,处理电路(声控电路、光控电路)及延时电路等部分组成。     

Is tourism just another staple? A new perspective on tourism in remote regions

According to recent research, countries may have a positive image from a tourism perspective, but they may be seen as lacking from an economic or political viewpoint. As governments and destination management organisations spend large sums of money in promoting tourist attractions, the question of whether these activities also influence other aspects of a country's image becomes relevant. The objective of the research is to determine the effect of tourism promotions on the image of the country and that of the destination as two separate concepts, in the case of Israel, a country subject to continuous conflicts. A 2?×?2 quasi-experimental design is utilised to investigate the influence of tourism promotional brochures. Additionally, a comparative perspective is used to determine whether people from diverse countries and backgrounds may be affected differently by the same information. The findings confirm that tourism brochures influence not only the image of the destination, but also that of the country. These effects are found to be different for respondents from the two different countries compared. The article focuses on understanding how tourism communication strategies may also be used to improve the image of a country, with potential benefits for international marketing and international relations.     

Bush v. Gore and the Effect of New Source Review on Power Plant Emissions

New Source Review (NSR) is a Clean Air Act regulation that requires electric utilities to meet emission standards when making modifications to existing power plants. The regulation increases the cost of replacing worn out parts, and limits the firm’s scope of potential capital investments. Such restrictions may lead to greater retirements and lower utilization, adversely affecting profits. Prior to the 2000 presidential election, investors expected Bush to have a narrower interpretation of NSR than Gore. Therefore, we use changes in stock prices to estimate the effect on profits of differences in NSR policy. Our results indicate that investors expected the average boiler to be $38 million more valuable under the Bush administration. Over the boilers’ lifetimes, the additional utilization will have increased emissions by 19 million tons of sulfur dioxide, 5.9 million tons of nitrogen oxides and 980 million tons of carbon dioxide, relative to natural gas generation.