有限元分析

Abstract(#br)An encapsulant in a Photovoltiac (PV) module is a polymer used for binding all the components together. It also provides protection of cells and interconnects from moisture, foreign impurities and mechanical damage. In addition to this, the encapsulant must possess certain desirable characteristics such as low cost, high transmittance of light, good thermal conduction and long operating range. The provision of such properties makes it a vital component on which the performance of a PV module depends.

Abstract(#br)We have developed a polydimethylsiloxane (PDMS) pattern with arrays of microwells for the formation of multicellular aggregates by C17.2 neural stem cells. Upon interfacing with the patterns, the neural stem cells would firstly attach to the microwell sidewalls, forming cellular strips on day 1 after plating.

摘要细胞牵引力的定量方法很多，包括牵引力显微镜和微加工的柱阵列。然而，这些方法都存在局限性，包括需要去除细胞来确定未被选中的颗粒位置，以及无法分别量化细胞骨架刚度较低的细胞所受的力。这里我们提出了一种新颖的牵引力量化方法，消除了这两种局限性。通过使用六边形的微接触印刷蛋白质点图案、一种新的计算算法和聚二甲基硅氧烷( PDMS )共混物的薄表面，我们演示了一个系统：·在稳定且易于制造的均匀表面上量化细胞力。·利用六边形的蛋白质点图案和计算几何来量化细胞力，而不需要细胞去除。·在细胞骨架结构刚度较低的细胞上量化细胞力。

Scratch resistance and friction are core properties which define the tribological characteristics of materials. Attempts to optimize these quantities at solid surfaces are the subject of intense technological interest. The capability to modulate these surface properties while preserving both the bulk properties of the materials and a well-defined, constant chemical composition of the surface is particularly attractive. We report herein the use of a soft, flexible underlayer to control the scratch resistance of oxide surfaces.

人们展示了一种高度可靠的反向梯形结构聚二甲基硅氧烷( PDMS )，以实现机械增强的非晶态铟镓氧化锌( a-IGZO )薄膜晶体管( TFTs )，用于皮肤兼容电子。有限元分析( FEA )模拟表明，与常规衬底相比，a-IGZO TFTs内部的应力可以得到有效的降低。基于该结果，采用常规光刻工艺，利用负光刻胶( NPR )实现反向梯形均质结构，简单易用的NPR光刻可实现高分辨率的图形化，从而获得大面积可扩展的器件结构。反向梯形结构PDMS上的a-IGZO TFT在10 V的漏极偏压下具有最大的饱和迁移率6.06 cm2V-1s-1，应变应力最小。因此，包括应力释放结构在内的a-IGZO TFT表现出较高的力学性能，在15 %应变下饱和迁移率变化在12 %以内，而PDMS上传统的平面a-IGZO TFT即使在1 %应变下也表现出超过10 %的迁移率变化，无法在2 %应变下工作。