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一种能克服两方程湍流模型刚性的流热一体化算法 总被引:1,自引:0,他引:1
使用流热一体化算法解决传统耦合算法难于处理的流场与固体温度场耦合计算问题.为保证其计算效率,提出一个简单有效的方法用以克服两方程湍流模型刚性.给出该方法的理论证明,并验证其配合多重网格提高LUSGS隐式时间推进法的计算效率. 相似文献
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Structure Tuning of Line-Defect Waveguides Based on Silicon-on-Insulator Photonic Crystal Slabs 下载免费PDF全文
We present fabrication and experimental measurement of a series of photonic crystal waveguides. The complete devices consist of an injector taper down from 3 μm into a triangular-lattice air-hole single-line-defect waveguide with lattice constant from 410nm to 470nm and normalized radius 0.31. We fabricate these devices on a silicon- on-insulator substrate and characterize them using a t unable laser source over a wavelength range from 1510 nm to 1640nm. A sharp attenuation at photonic crystal waveguide mode edge is observed for most structures. The edge of guided band is shifted about 30nm with the 10nm increase of the lattice constant, We obtain high-efficiency light propagation and broad flat spectrum response of the photonic crystal waveguides. 相似文献
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Defect reduction in GaAs/Si film with InAs quantum-dot dislocation filter grown by metalorganic chemical vapor deposition 下载免费PDF全文
The growth of GaAs epilayers on silicon substrates with multiple layers of InAs quantum dots(QDs) as dislocation filters by metalorganic chemical vapor deposition(MOCVD) is investigated in detail.The growth conditions of single and multiple layers of QDs used as dislocation filters in GaAs/Si epilayers are optimized.It is found that the insertion of a five-layer InAs QDs into the GaAs buffer layer effectively reduces the dislocation density of GaAs/Si film.Compared with the dislocation density of 5×10~7 cm~(-2) in the GaAs/Si sample without QDs,a density of 2×10~6 cm~(-2) is achieved in the sample with QD dislocation filters. 相似文献
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介绍了由滤光片膜层结构决定的激光在光学薄膜中形成温度场及驻波场特性。用1.06μm调Q Nd:YAG激光器,在激光脉冲宽度10ns和光斑直径0.61μm的条件下,进行了激光辐照红外滤光片的损伤特性实验研究。根据脉冲激光辐照红外滤光片后样品损伤分析,发现滤光片的最初损伤发生在里面的膜层中,从而在实验上验证了计算得到的滤光片膜层中存在其温度场及驻波场的结果。它对提高红外滤光片的抗激光辐照能力研究具有一定的参考价值。 相似文献