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The flowing stress of a highstrength steel before unloading is different with the yield stress of the same sample extended in air after unloading and charging with hydrogen. The difference is the hydrogeninduced additive stress, which can help the external stress to enhance the plastic deformation. The hydrogeninduced additive stress,σad, induced through being immered in a 3.5% NaCl solution with pH=4 increases linearly with the yield strength of the sample,e.g.,σad=106.6 + 0.14σys. On the other hand, hydrogeninduced additive stress increases linearly with the logarithm of hydrogen concentration in the samples with the yield strengths of 900 and 1050 MPa,i.e,σad=55.5 + 63.6 lnC0(σys=900 MPa) andσad=23.5 + 64.2 lnC0(σys=1050 MPa). To sum up, the hydrogeninduced additive stress isσad=260 + 0.226σys+ 63.9 lnC0.

Till now, ecological immigrations in Three Rivers District in Tibetville Village of Qinghai province have achieved a great progress; however, there are some issues we should pay attention to. This paper tries to adopt the Push and Pull Theory to analysis the factors of their migration; meanwhile, because of the special dimensions of minorities in the northwest region, the anti push and pull factors and the reasons of their move back will be combined together. The conclusion is that to set up reasonable and useful compensation mechanism is very crucial for ecological immigrations.

In order to enhance the extraction rate of polysaccharides, a series of statistical approach was used to optimize the ultrasonic-assisted extraction conditions from the mycelium of Paecilomyces tenuipes Pt196. [Metho The optimization of conditions was carried out in two stages. Firstly, the effects of various experimental parameters considered for the investigation (ultrasonic power, ultrasonic time and liquid-solid ratio) were studied using the method of single factor test design experiments. Secondly, a 15-run Box-Behnken design was performed to optimize the extraction conditions of polysaccharides. The experimental results of Box-Behnken design were analyzed by response surface methodology and artificial neural network together with genetic algorithm. [Result The optimum conditions for polysaccharides extraction obtained by the application of artificial neural network-genetic algorithm were ultrasonic time 345s, ultrasonic power 320 W and liquid-solid ratio 95 mL·g-1. [Conclusion Artificial neural network-genetic algorithm can effectively select the best extraction conditions of polysaccharides in this study.

Contrastive Studies of Pun in Figures of Speech. Pun as a figure of speech uses a word or phrase to get two meanings: literal meaning and connotation meaning so as to achieve humorous or sarcastic sense. There are many similarities between English and Chinese but in many ways they are different, while people always subconsciously consider them as equal and use them in any occasions. To solve these problems, this thesis solves them through the contrastive study of English and Chinese rhetorical figure-pun. By analyzing and comparing English and Chinese puns in some typical sentences and dialogues through semantic, pragmatic, cultural perspectives, partial tone, forms, meanings and so on. This thesis show that pun between English and Chinese exists lots of similarities and differences from different perspectives. Through all the endeavors done in this thesis, a better understanding of both languages and cultures, and smoother translation would be obtained. What’s more, people can use puns in English and Chinese languages properly so as to eliminate unnecessary misunderstandings when communicating with others. Keywordspun contrastive study relevance theory cooperative principle differences and similarities

By analyzing the present status of water supply system of our country, the concept of subarea of city water supply system is detailed. Pointing out that the subarea is the foundation of optimal control. Then the method of subarea based on the boundary of water supply and the pressure of the nodes is brought forward, and how to programming between and in the small area is discussed. Through subarea, the functions of pipes are definite. So we can more easily compute the flow of some area, control the pressure of pipes, optimize the water supply system. Thus, the aim to reducing the pipe leaks and improving the benefit on economy is obtained.

Multimedia no longer is the traditional auxiliary teaching tool, but to construct one kind of new network teaching environment to create the condition, specially regarding the education socialization, the multimedia networks is one kind of more ideal dissemination tool. Multimedia itself has: The fusion lives, the misalignment, not to have the constitutive property, the negotiation, to be possible mutually, timeliness characteristics and so on editor; Simultaneously utilizes in the education teaching also has its special skill: Favors the information the memory use, is raises the divergent thought the tool, to urge the study individualizing realization. The foothold will develop in the future, uses the multimedia networking, the development teaching experiment.