排序方式: 共有6条查询结果,搜索用时 0 毫秒
1
1.
作为数学的学习与研究,如果仅仅停留在把题目答案找出来,笔者认为远远不够,为解题而解题,数学思维能力很难得到更深程度的训练和提高,数学学习过程中,应该想尽办法让思维呈立体状,多纬度,居高临下,由点到面,通过解一道题却能复习更多的数学知识,尽可能让一道题目变得更丰满,知识容量更大,同学们收获更多.而“一题多解”这种策略如果运用恰当就能很好地训练同学们的思维能力. 相似文献
2.
简要介绍了有限元法与超胞法相结合计算结构声表面波缺陷能带结构的方法,理论上分析了缺陷型表面声子晶体的声限制和声波导.表面声子晶体由刻有周期性凹槽的刚性板构成,通过改变晶体中某一格点或某一排格点的几何参数可以构建点缺陷和线缺陷.利用有限元法与超胞法能够十分方便地计算出表面声子晶体的点缺陷和线缺陷对应的缺陷带结构以及特定频率声波局域在点缺陷与线缺陷的本征压力场.通过分析缺陷能带结构与本征压力场,可以直观地了解缺陷型表面声子晶体中的声限制和声波导. 相似文献
3.
The dynamical behavior of an intruder immersed in a two-dimensional shaken granular bed is experimentally investigated. With two types of background particles, f-Г phase diagrams depicting the intruder's motion are measured and compared. It is found that even with the same size and density ratio of the intruder to the background particles, the intruder exhibits a distinct behavior at given vibrational conditions: rising behavior in one granular bed; sinking behavior in another granular bed. We slightly tune the size and density ratio to confirm the reliability of the experimental results. In addition, we examine the influences of interstitial air, convection and the initial position on the intruder's motion, speculating that the opposite motion could be traced to the material properties of the background particles. 相似文献
4.
5.
We study shot noise in tunneling current through a double quantum dot connected to two electric leads.We derive two master equations in the occupation-state basis and the eigenstate basis to describe the electron dynamics.The approach based on the occupation-state basis,despite being widely used in many previous studies,is valid only when the interdot coupling strength is much smaller than the energy difference between the two dots.In contrast,the calculations using the eigenstate basis are valid for an arbitrary interdot coupling.Using realistic model parameters,we demonstrate that the predicted currents and shot-noise properties from the two approaches are significantly different when the interdot coupling is not small.Furthermore,properties of the shot noise predicted using the eigenstate basis successfully reproduce qualitative features found in a recent experiment. 相似文献
6.
作为数学的学习与研究,如果仅仅停留在把题目答案找出来,笔者认为远远不够,为解题而解题,数学思维能力很难得到更深程度的训练和提高,数学学习过程中,应该想尽办法让思维呈立体状,多纬度,居高临下,由点到面,通过解一道题却能复习更多的数学知识,尽可能让一道题目变得更丰满,知识容量更大,同学们收获更多.而一题多解这种策略如果运用恰当就能很好地训练同学们的思维能力. 相似文献
1