共查询到20条相似文献，搜索用时 62 毫秒
1.
2.
随着教育信息化的高速发展,线上线下混合教学模式在高校非通用语种教学中被广泛应用。文章以德语写作课程为例,阐述了线上线下混合式教育的研究现状,分析了德语写作课程的教学现状、混合式教学模式的必要性与可行性,在此基础上,探讨了线上线下混合式教学在高校非通用语种写作课程教学中的应用,以期提升非通用语种写作课程的教学质量。 相似文献
3.
关于非定常流中流线与迹线性质的几个结论的商榷吴道全，张幼雯关于非定常流中流线和迹线的性质，在很多工程流体力学的教科书中，常出现一些值得商讨的结论：（１）对于非定常流，过空间固定点的流线随时间而变化。（２）对于非定常流，不同时刻过空间固定点的流体质点的... 相似文献
4.
线阵CCD技术是现代光电技术的一个重要分支，其在工业领域有着非常广泛的应用，非接触式直径测量便是其中之一。在实验教学中设计了一种基于线阵CCD的非接触式直径测量实验装置，并对实验中的数据处理进行探讨。 相似文献
5.
夏红卫 《常熟理工学院学报》2007,21(10):19-23
提出一种用非单调线搜索方法求解简单界约束非线性方程组,算法采用不精确线搜索技巧,并使用非单调结构,将当前函数最大值的下降改进为函数平均值的下降,推广了算法的适用范围.进行了数值试验,结果表明算法十分有效. 相似文献
6.
对一般非凸无约束优化问题提出了一类在修正的DFP算法下的广义拟牛顿算法,证明了该算法对非凸函数在Goldstein非精确线搜索下具有全局收敛性. 相似文献
7.
雷伟华 《南宁师范高等专科学校学报》2000,(2)
线搜索过程是最优化方法的基本组成部分，由于在实际计算中，理论上精确的最优步长因子一般不能求到，求几乎精确的最优步长因子需花费相当大的工作量，因而花费计算量较小的非精确线搜索具有重要的实际意义。本文在四种非精确线搜索下讨论了一类比文［５］广的特殊算法，并获得了算法较强的收敛性质。 相似文献
8.
研究了一种非单调Armijo型线搜索,发现了此线搜索的一些新的性质,并利用这些新性质证明了此线搜索Liu-Storey(LS)共轭梯度法不仅是全局收敛的,而且是强收敛的。 相似文献
9.
10.
CAN总线是现场总线的一种，较复杂的现场总线应该既能传送实时数据，又能传送非实时数据。针对实时数据和非实时数据的传送，分别提出了分布式优先权队列动态分配晋升机制和入侵型CSMA／CD协议，解决了两种数据在CAN总线上传输的兼容问题。 相似文献
11.
12.
13.
《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
14.
罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
15.
《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
16.
Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
17.
Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
18.
Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
19.
Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献