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The effect of the orientation on the magnetostriction in Fe81Ga19 alloy has been investigated experimentally and theoretically. The Fe81Ga19 [001] and [110] oriented crystals were prepared and the magnetostriction was measured under different pre-stress. The saturation magnetostriction of the [001] oriented crystal increases from 170×10-6 to 330×10-6 under the pre-stress from 0 to 50 MPa. The [110] oriented crystal has a saturation magnetostriction from 20×10-6 to 140×10-6 with the compressive pre-stress from 0 to 40 MPa. The magnetostriction of [001] and [110] oriented crystals has been simulated based on the phenomenological theory. The domain rotation path has been determined and the resultant magnetostriction calculated under different pre-stress. The experimental and simulated results both show that the [001] oriented crystal exhibits better magnetostriction than [110] oriented crystal. The enhancement of the saturation magnetostriction by the compressive pre-stress in the [110] oriented crystal is higher than that in the [001] oriented crystal. 相似文献
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基于武都万象洞高分辨率石笋δ18O和高精度230Th定年数据,结合利用周边地区史料恢复的旱涝指数序列,重建季风区边缘近500 a以来降水变化。结果显示:在年际至百年时间尺度上,万象洞石笋δ18O变化指示亚洲季风带来的降水量信息。季风区边缘降水变化可分减弱期(1470~1700 A.D.)、平稳期(1701~1875 A.D.)和增强期(1876~2003 A.D.)三个气候段,其间季风降水的强弱变化响应史料记载的极端旱涝事件。在小冰期向20世纪暖期转换过程中,本区呈现阶梯式过渡降水模式,这是一种较大空间尺度上气候特征,在年代际至百年时间尺度上与北半球温度、中国温度变化具有同步性。 相似文献
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基于地域性文化特色与区域旅游经济提升,借助MapInfo、Excel等技术手段,探讨了辽西走廊非物质文化遗产的结构特征及其影响因素.研究结果表明:宏观层面以锦州、朝阳为中心圈,向东、西、南三方向呈现递减的非均衡分布特征,而微观层面分别以锦州市区、葫芦岛市区、朝阳市区、阜新蒙古族自治县、大洼县为中心,向市域内其他县市减少扩散;其级别结构特征以市级为主,省级次之,国家级与世界级的比例较少;其类型结构以传统美术和传统技艺类为主,民间文学、曲艺、传统音乐、传统体育游艺与杂技类项目偏少.就其影响因素而言,主要有流域的历史积淀性、多民族的文化交错性、地方政府的主导性、交通网络的推动性等方面. 相似文献
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