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Copyright of Application Research of Computers / Jisuanji Yingyong Yanjiu is the property of Application Research of Computers Edition and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The constant amplitude fatigue test of 6061 aluminum alloy and 7075 aluminum alloy dissimilar metal argon are welded butt joints was carried out by MTS809 material testing machine, and the fatigue fracture of typical specimens was observed by TESCAN VEGA3 scanning electron microscope. The results show that the fatigue life of the specimen with retained reinforcement is higher than that with removed reinforcement, and the fracture position of the fatigue specimen is in the middle of the weld. The fatigue life of two kinds of welded joints was predicted by the notch stress method and linear elastic fracture mechanics method, and the predicted life and experimental life were basically within 3 times the error band. The prediction results of the two methods for the welded joints with removed reinforcement are better than those with retained reinforcement. [ABSTRACT FROM AUTHOR]

Copyright of East China Geology / Huadong dizhi is the property of Editorial Department of East China Geology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Food Safety & Quality is the property of Journal of Food Safety & Quality Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Agro-Environment Science is the property of Journal of Agro-Environment Science Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The geological characteristics of coal-derived gas resources in Linxing and Shenfu area show a multi-layer system vertically, a superposition and mutual occurrence of lithology, as well as the development of thin interlayers and a low effective rate by monolayer fracturing within these thin interlayers or directly/closely-contact layers. A multilayer fracturing technology for exploring and developing the coal-derived gas resources was introduced in this paper. By numerical simulation method,the paper studied the influences of cementation strength and dip angle of interface, stress difference between layers,fracturing operation displacement and other factors on fracture propagation. Also,the fracturing operation parameters were optimized, then a suitable reservoir conditions for multilayer fracturing was determined. Based on rock crack criterion and interface fracture criterion,a multilevel evaluation model of multilayer fracturing feasibility in coal-derived gas reservoir was finally established, with factors like coal structure, interface mechanics and stress field taken into account. The study has a certain guiding significance to the application of the multilayer fracturing technology. [ABSTRACT FROM AUTHOR]