关于数学优化思想的RMI方法定映分析

以RMI方法为视角探讨优化思想中的核心问题———在映像关系结构中定映目标问题的解,为应用数学优化研究实际问题,提供了一种科学的思维方式.     

浅谈数字化学习

简要地分析和探讨了数字化学习的内涵及其核心要素。     

A Comparison between Different Approaches and Methods in Foreign Language Teaching

Different approaches and methods through history play significant roles in foreign language teaching. This paper makes a comparison of four influential approaches and methods in terms of definition, advantages and disadvantages. It is necessary to combine those approaches and methods to facilitate the development of foreign language teaching.     

Relationships of Aegilops tauschii revealed by DNA fingerprints: The evidence for agriculture exchange between China and the West

Genetic diversity and relationships of wild goat grass (Aegilops tauschii Cosson) from Iran and Xinjiang,west China,as well as its weedy type from the Yellow River region of Shaanxi and Henan provinces in China were analyzed by simple sequence repeat (SSR) fingerprints.A high level of genetic diversity in Aegilops tauschii accessions from Iran was observed,and the richness of genetic diversity was followed by accessions from Shaanxi,Henan,and Xinjiang.The weedy type of Aegilops tauschii showed a close genetic relationship with the wild type from different regions in Iran.The results indicated that the weedy Aegilops tauschii found in the Yellow River region was most likely introduced from lran-the diversity center of Aegilops tauschii.The weedy Aegilops tauschii populations found in the Yellow River region may be brought into the central part of China as a weed species together with common wheat (Triticum aestivum L.) from the West during various periods of time in history.This finding has provided strong evidence for the introduction of common wheat from the West into China via the Silk Road,and also demonstrated the important role of the Silk Road in the exchange of agri-culture and other relevant technologies between China and the West.     

细胞粘附肽Arg-Gly-Asp的合成与生物活性检测

采用固相多肽合成法合成Ag-G ly-Asp(RGD)三肽,以天门冬氨酸计RGD三肽收率为75%,采用MTT法进行合成肽RGD抑制人纤维肉瘤细胞HT1080转移机理方面的研究,证实了人工合成的RGD肽能抑制人纤维肉瘤细胞HT1080与纤维连接蛋白(FN)的粘附。     

高校校园文化建设刍议

高校校园文化具有广泛的群众性、强大的渗透性和充分的自主性,是学校教育的重要组成部分,是校园生活的重要内容,也是高校提高学生素质的最有效途径之一。因此,应通过多种渠道,采取多种措施,加强高校校园文化建设。     

技术制图简化表示法

介绍了新、旧国际简化画法和尺寸注法的主要差异 ,讨论了GB/T16 6 75 1～ 16 6 75 2—1996《技术制图　简化表示法》的应用条件     

长周期光纤光栅的制作及热退火特性

本文给出了长周期光纤光栅的制作方法，研究了长周期光纤光栅的热退火特性，得出长周期光纤光栅的中心波长随不同退火条件的变化趋势，最后根据老化曲线法确定退火的温度和时间，发现当老化参数达到14900时，光栅的光学特性就达到了稳定，即可满足实际应用的需要。     

十字路口交通信号相位个数的优化设计

为了解决交通拥挤，减少人们在交通路口等待时间，主要是通过提高交通信号灯的循环效率即找到交通信号灯的最优相位个数来实现的。通过引入图论中”圆染色”的概念，将城市路口交通信号灯最优相位个数归结为其交通流模型图的圆色数。在这篇文章中，根据十字路口交通流状况，给出了8种交通流模型图和它们圆色数，也即为对应交通信号灯的最优相位个数。