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INTRODUCTION The elastic properties of coating layers in coating materials are very important in the design and evaluation for engineering purpose. They can serve as ground knowledge in the selection of surface coatings for particular applications, and can be used to monitor the quality of physical processes (Every, 2002). Therefore, estimation of the elastic properties of coating layers is of great practical value. Much effort has been put into measuring the material properties of coatin… 相似文献
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Computers are useful machines. They can help people a lot in their daily life. Forexample, they can help people to save much time to do much work, and they can helppeople to work out many problems they can’t do easily. Our country asks everyone tolearn to use computers before the twenty-first century, except the old people.Today more and more families own computers. Parents buy computers for theirchildren. They hope computers can help them improve their studies in school. Yet, manyof their … 相似文献
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There exists great confusion among students about the choice of words in speaking English.They feel it difficult to express themselves very effectively and clearly.In a highly competitive society with strong tendency to merge in multicultures,one my fail to attain his goal in life if he/she turns a blind eye to the importance of effectively speaking international language-English because English is an indispensble communicating means in colorful world.This article offers criteria that can be used by English speaders to measure whether their words contribute to an effective oral style.Language is symbolic,so the words contribute to an effective oral style.Language is symbolic,so the words we use in our speeches represent ideas,objects and feelings,The resders,not only the students,can be informed of the fact that ideas are clarified through vivid,emphatic and appropriate expressions in addition to precise,specific,concrete,simple language. 相似文献
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Two-dimensional irregular polygons packing problem is very difficult to be solved in traditional optimal way.Simulated annealing (SA) algorthm is a stochastic optimization technique that can be used to solve packing problems.The whole process of SA is introduced firstly in this paper,An extended neighborhood searching method in SA is mainly analyzed,A general module of SA algorithm is given and used to lay out the irregular polygons.The judgment of intersection and other constrains of irregular polygons are analyzed,Then an example that was used in the paper of Stefan Jakobs is listed .Results show that this SA algorithm shorterns the computation time and improves the soluiton. 相似文献
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1.不能用被动式的动词Some verbs cannot be used in the passive form. They include bloom,cease,come,compete,connote, die,differ,resign.Such verbs can only be used in the active form. [Don’t say:He has deeided to be resigned at the end of this year.] Exercise 1 Correct the expressions in brackets. 相似文献
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As we know,SECT-3 is an important means to test the English language ability of a student who is not an English major in the vocational schools in Sichuan province.Of all the parts in the SCET-3,the majority of students think that the listening comprehension part is the most difficult one.There are some ways to tackle these problems in the listening part.By comparison and analysis of these questions appeared in the past few years,some regular patterns can be found.Different strategies can be used to solve different questions of each section in the listening comprehension part,so that students will feel easier in passing the SCET-3. 相似文献
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Jim Wingate 《英语辅导》2004,(3)
The insightsYour learners can very often feel stupid, incompetent and infantile in English. They are none of these in their own language. Their self-image in English can be bad. They can protect themselves by blaming others:‘My teacher's no good,' ‘English is too difficult,' ‘I’m too busy to do homework (and fail)'. 相似文献
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Motivation is one of the most important factors access to success.There are three types of students’ motivation in English learning.In order to get good result in the process of teaching,teachers try their best to develop students’ motivation.They have tried many ways,such as enhancing students’ interesting through playing games,introduce the culture of English speaking countries.It’s meaningful that teachers develop several kinds of motivation at the same time.All these important methods can be used in actually teaching to get a better result. 相似文献
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Parameters optimization and nonlinearity analysis of grating eddy current displacement sensor using neural network and genetic algorithm 总被引：1，自引：0，他引：1
A grating eddy current displacement sensor （GECDS） can be used in a watertight electronic transducer to realize long range displacement or position measurement with high accuracy in difficult industry conditions. The parameters optimization of the sensor is essential for economic and efficient production. This paper proposes a method to combine an artificial neural network （ANN） and a genetic algorithm （GA） for the sensor parameters optimization. A neural network model is developed to map the complex relationship between design parameters and the nonlinearity error of the GECDS, and then a GA is used in the optimization process to determine the design parameter values, resulting in a desired minimal nonlinearity error of about 0.11%. The calculated nonlinearity error is 0.25%. These results show that the proposed method performs well for the parameters optimization of the GECDS. 相似文献
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海量存储系统中高扩展性元数据分布算法的研究 总被引：2，自引：2，他引：0
Distribution of metadata in a metadata server cluster is important in mass storage system. A good distribution algorithm has a significant influence on the system performance, availability and scalability. Subtree partition and hash are two traditional metadata distribution algorithms used in distributed file systems. They both have a defect in system scalability. This paper proposes a new directory hash （DH） algorithm. By treating directory as the key value of hash function, implementing concentrated storage of metadata, pipelining operations and prefetching technology, DH algorithm can enhance the system scalability on the premise without sacrificing system performance. 相似文献
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Interactive communication is not straightforward but complicated. Prosodic features play an influential role in English communication. They can be used to signal certain pragmatic purposes in real situations for listeners and speakers to have mutual understanding. Identifying the pragmatic functions of prosodic features will facilitate the teaching of listening and speaking. English teachers need to clarify and emphasize the relationship between prosodic features and their pragmatic functions, attempting to work out how to combine them together into teaching in order to teach students to communicate effectively. 相似文献
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《英语辅导》2005,(2)
In the mid-1980’s researchers at Cleveland State University made a startling discovery. They conducted an experiment by creating two fictitious job candidates—David and John.Thecandidates had identical resumes and letters of reference.The only difference was that John’s letterincluded the sentence“Sometimes,John can be difficult to get along with.”They showed the re- 相似文献
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Oil contaminated soil was collected from Huangpu River-Yangtze River estuary wetland, with the aim of isolating oil-degrading microorganisms and evaluating their ability to degrade diesel. Three bacterial strains were discovered and identified by sequencing their 16S rDNA genes, two were Pseudomonas and one was Alcaligcnes. The proper growth conditions of each bacterium were measured and presented for diesel biodegradation. Biodegradation assays revealed that the degradation rates of three bacterial strains were 42.5%, 14.6% and 15.9% in 7 d respectively. They all play an important role on the nalkanes within the range of C16-C25 components of diesel. The results indicated that the oil-degraders can adapt to degrade diesel. The bacterial strains can be used in wetland diesel pollution control. 相似文献
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The development of biodegrad able bone cement systemhas received considerable attention over the past fewyears .One of the most important and attractive families is biode-gradable polyesters .They can be used as biomaterial scaf-fold to provide mechanical… 相似文献
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Computers are very important to modern life. Many people think that in the future computers will be used in lots of everyday life. It is thought that we won' t have to go shopping because we will be able to get most things which are sold in shops on the Internet. There will be no more books because we will be able to get 相似文献
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As the society develops, information becomesmore important than ever before. Computers willgradually be familiar to more and more people andbe used in more and more ways. Internet makes theworld integrated(合并) as a whole. So, it is important to learn how to make use of the Internet. 相似文献
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沈途 《语数外学习(高中版)》2007,(2)
<正>At first, the people of the whole world had only one language and used the same words. As they wandered about in the East, they came to a plain in Babylonia and settled there. They said to one another,“Come on! Let's make bricks and bake them hard.” So they had bricks to build with and tar to hold them together. They said,“Now, let's build a city with a tower that reaches the sky, so that we can make a name for ourselves and not be scattered all over the earth.” 相似文献