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对野生和栽培欧李果实营养成分进行比较研究,为进一步开发利用欧李提供依据。分别采用常规分析法、原子吸收光谱法、GC-MS法对野生欧李和栽培欧李果实的可溶性固形物、VC、总糖、总酸、Ca、Zn、Fe及脂肪酸进行分析。结果显示,野生欧李果实中可溶性固形物、总糖、VC含量极显著高于栽培欧李(P0.01),栽培欧李中的总酸高于野生欧李(P0.05);野生、栽培欧李果实中Ca、Zn、Fe含量分别为450.36、12.32、3.28 mg/kg和381.24、11.16、2.14 mg/kg,其中野生欧李Ca、Fe的含量显著高于栽培欧李(P0.05),Zn含量二者无显著差异;野生、栽培欧李果实中均鉴定出棕榈酸、油酸、亚油酸及亚麻酸4种脂肪酸,分别占总检出量的81.17%和59.94%,野生欧李果实中脂肪酸含量高于栽培欧李,其中不饱和脂肪酸含量,野生欧李果实显著高于栽培欧李果实,特别是油酸含量高出1倍多。 相似文献
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微机电技术在引信中的应用 总被引:2,自引:0,他引:2
微机电技术是实现引信小型化和引信功能拓展的关键技术之一.综述微机电技术在精确打击弹药引信、灵巧弹药引信、防空反导引信、轻武器面杀伤弹药引信、水中高效毁伤弹药引信应用现状.利用微机电技术实现引信微小型化提高弹药的高效毁伤能力,识别发射环境和目标,提高引信的信息利用水平,提高引信的智能化水平,实现引信功能多样化和扩展化,实现引信系统通用化、系列化和组合化.对比我国微机电技术在引信中的应用与国外技术在三维加速度传感器、微型卫星定位信号接收机、微型惯性测量组合、射频MEMS器件等方面的差距,指出了我国加速发展微机电技术在引信中应用的必要性. 相似文献
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The squeeze-film air damping exists in a lot of micro-electronic-mechanical system (MEMS) devices unavoidably. The effects of air damping in traditional inertial switch with spring-mass system can be ignored for its large volume and mass. But, many properties of MEMS switch, such as sensitivity, resolution and contact time, are affected by the air damping caused from the squeezed air film between two parallel plates moving relatively. Based on the conservation laws for mass and flux and the nonlinear Reynolds equation, the coefficient of squeeze-film damping was derived. The dynamic responses of the inertial switch with and without squeeze-film damping were simulated by using software ANSYS. The simulated results show that the sensitivity and contact time of the switch descend by about 5% and 15%, respectively, when the effects of squeeze-film damping are considered. 相似文献
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