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利用自制小型可视化试验装置对真空预冷处理洋葱表皮组织过程中的表面形态进行实时观察,分析了其细胞膜与细胞壁间隙、超微结构和质量、电导率、拉伸强度等性能指标,以及真空预冷处理对植物组织微观结构的影响.结果表明,水分迁移和压力变化产生的微应力导致洋葱表皮的细胞颜色、表面形态、细胞膜与细胞壁间隙发生了明显变化,使其拉伸强度降低、电导率升高. 相似文献
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The helium bubble structure and growth modes near dislocations in titanium are studied using the molecular dynamics method. A helium crystal with an HCP structure in titanium is found to have a lattice constant of 1.977 A? at 0 K. On either side of the slip plane, helium bubbles form in the(001) plane, but they are in different growth modes. On the side of the slip plane with full atomic layers, helium bubbles grow toward the slip plane and easily cross the slip plane. In the growth process, the position of the top surface of the helium bubble remains almost unchanged. On the other side of the slip plane,the helium bubble grows initially toward the dislocation core, but it is difficult to cross the slip plane, which results in growth in the opposite direction upon reaching the slip plane. 相似文献
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介绍了锁相环调频发射机的原理,分析其传输特性,指出环路设计时应注意的问题.分析影响有源滤波器特性的因素,并对其仿真,验证该设计能够满足系统的要求. 相似文献
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