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Production of Drought and Salt Tolerant Transgenic Cereal Plants
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作者 a. garg 《分子植物育种》 CAS CSCD 2007年第2期278-278,共1页
Genetic transformation of cereal plants is a powerful method for producing agronomically useful transgenic plants. Salt and drought stress result in substantial yield losses, which amounts to many billions of dollars
关键词 谷类植物 耐盐性能 产量 稻子
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Characterization of the tensile properties of friction stir welded aluminum alloy joints based on axial force, traverse speed, and rotational speed 被引量:2
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作者 Biranchi PaNDa a. garg +2 位作者 Zhang JIaN akbar HEIDaRZaDEH Liang GaO 《Frontiers of Mechanical Engineering》 SCIE CSCD 2016年第3期289-298,共10页
Friction stir welding (FSW) process has gained attention in recent years because of its advantages over the conventional fusion welding process. These advantages include the absence of heat formation in the affected... Friction stir welding (FSW) process has gained attention in recent years because of its advantages over the conventional fusion welding process. These advantages include the absence of heat formation in the affected zone and the absence of large distortion, porosity, oxidation, and cracking. Experimental investigations are necessary to understand the physical behavior that causes the high tensile strength of welded joints of different metals and alloys. Existing literature indicates that tensile properties exhibit strong dependence on the rotational speed, traverse speed, and axial force of the tool that was used. Therefore, this study introduces the experimental procedure for measuring tensile properties, namely, ultimate tensile strength (UTS) and tensile elongation of the welded AA 7020 A1 alloy. Experimental findings suggest that a welded part with high UTS can be achieved at a lower heat input compared with the high heat input condition. A numerical approach based on genetic programming is employed to produce the functional relationships between tensile properties and the three inputs (rotational speed, traverse speed, and axial force) of the FSW process. The formulated models were validated based on the experimental data, using the statistical metrics. The effect of the three inputs on the tensile properties was investigated using 2D and 3D analyses. A high UTS was achieved, including a rotational speed of 1050 r/min and traverse speed of 95 mm/min. The results also indicate that 8 kN axial force should be set prior to the FSW process. 展开更多
关键词 tensile properties ultimate tensile strength tensile elongation friction stir welding tool rotational speed genetic programming welding speed
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