数控系统内置式PLC的FPGA实现方法

提出了一种用FPGA实现数控系统内置式PLC的方法.通过在FPGA内部实现PLC逻辑,并提供能够编译PLC指令的编译器,实现了数控系统对通用PLC编程语言的支持.所述方法在基于ARM FPGA的数控系统上得到了实现.     

我省高职高专院校图书馆现代技术应用情况调查

目的比较与探讨不同类型高职高专图书馆现代化技术应用情况方法采用自编问卷对部分高职高专图书馆进行调查结果高职高专图书馆情况差异较大二级学院、民办学院处于前列,新高职、高专、职工大学紧随其后,挂靠学院与普通中专正在崛起。     

炉渣滤床技术处理亚麻生产废水

为了确定处理包头亚麻厂亚麻生产废水的设计方案，设计之前在现场进行了生产试验。在包头亚麻厂污水处理站，模拟炉渣滤床制造了3米高的炉渣滤层，滤渣从工厂锅炉房取用，将实际排放的亚麻煮漂车间、细纱车间、粗纱车间的生产废水混合后，通过炉渣滤层过滤处理，处理后出水由厂化验室和包头环保局化验。试验结果表明，处理后的排水各项指标完全达到国家排放标准。该工艺处理费用低，运行效果稳定，管理简便，具有明显的经济效益、环境效益和社会效益。     

Digital Aircraft Sheet Metal Part Manufacturing System and Its Key Technology

The architecture of digital sheet metal manufacturing system is proposed based on the classification of sheet metal manufacturing information.The essence of digital manufacturing is the definition,management and transfer of information,and the key technologies are brought forward and described.It is pointed out that knowledge-based manufacturing elements design is necessary to make digital technology efficient.The management of all kinds of sheet metal manufacturing element information is to build single source of manufacturing data.Multi-state model-based digital transfer and coordination method is designed to provide a foundation for digital manufacturing of aircraft sheet metal part.The application of digital sheet metal manufacturing is exemplified with an aircraft sheet metal part.The application result is compared to that of the traditional analog transfer technology.It is shown that the developed technology can improve part quality,shorten manufacturing time and lower manufacturing cost.     

Earthshine and Asteroseismology Telescope (East) Network

Several automated optical telescopes have been setup at appropriate longitudes around the globe to study earthshine variations and asteroseismology. The first telescope has been setup at Teide Observatory, Tenerife, Spain in October 2004. The intensity of earthshine relates to the average of Earth’s albedo, and in turn relates to the global temperature of the Earth. A global network is necessary because each site can measure the earthshine reflected from only a part of the Earth. The network will also be used for asteroseismology study. It can measure photometric variations of pulsating stars. The long-term and continuous measurements allow the accurate determination of mode frequencies of stellar pulsations, which provides information on the properties of stellar interior.     

英语课堂教学中学生的厌烦心理及其分析

分析英语课堂教学中学生厌烦心理，转变教学观念，培养学生学习兴趣，真正发挥课堂教学的作用。     

滚珠丝杠螺距误差补偿法提高数控机床定位精度的研究

在详细论述、对比了实现数控机床滚珠丝杠螺距误差补偿的硬件、软件方法的原理基础上,对滚珠丝杠螺距误差软件补偿法可有效提高数控机床的定位精度进行了试验验证。     

区域极点及方差约束下的航天器拦截控制：静态输出反馈情形

本文提出并讨论了具有选通窗约束的航天器拦截控制问题，指出航天器拦截控制的稳暂态性能指标可表现为系统稳态状态方差及闭环区域极点的形式。然后，基于配置控制的思想，本文完整地给出了期望静态反馈控制器的存在条件及其解析表达式，并举例说明所提设计方法的直接性与有效性     

如何为《飞机工程》撰写符合规范又有创新的论文

介绍了科技论文规范表达对收集、储存、处理、加工、检索、利用、交流和传播的作用，结合《飞机工程》投稿的实际，指出了作者在文字、标点、符号、图表、公式、量和单位表达中容易忽视和写错的一些技术细节，给出了科技论文规范表达的撰写格式，以及为《飞机工程》投稿时应注意的事项。     

碧水青山映古城——雨城雅安

雅安市坐落在四川省中部，位于四川盆地与青藏高原交接带。古为青衣羌国领地，汉代称雅州，名闻遐迩的川藏茶马古道以此为起点翻越莽莽群山逶迤西去，城边的蒙顶山是中国茶化的发祥地，憨态可掬的大熊猫也是从雅安山野里走向世界……此地自古就是多元化的交汇之所，也是地理意义上汉区与藏区和彝区的分水岭，高耸入云的大山将这里切割为迥然而异的化区和自然带，川流不息的青衣江荡涤着这座古风习习的昔日边城。