Rectangle Lattice Photonic Crystal with Large Absolute Band Gap at Low Frequency;
在低频区具有大带隙的长方晶格二维光子晶体
The rectangle lattice 2D photonic crystal is formed by rectangle grid of dielectric veins and discrete square dielectric rods.
将呈网带连通的长方网格与呈离散状态的正方介质柱组合构成长方晶格光子晶体, 用快速平面波展开法计算其能带结构, 通过参数优化, 在低频区找到最大绝对禁带宽度Δω=0 105 6ωe(ωe=2πc/a, a为晶格常数, c为光速), 绝对禁带中心频率ωc=0 903 8ωe,Δω/ωc=11 7%。
The modified plane-wave expansion method for calculating quickly the band structure is used to study the band structure in two rectangle lattice 2D photonic crystals.
利用快速平面波展开法研究了两种长方晶格光子晶体,发现它们在高频区都存在大带隙,经参数优化,原胞结构为“工”字形的光子晶体,最大绝对禁带宽度Δω为0。
Theoretical study on cuboid magnetic field and its gradient expression without analytic singular point;
长方体磁场及其梯度无解析奇点表达式理论研究
A quasi-human algorithm for solving cuboid packing problem;
求解长方体packing问题的拟人算法
In this paper,the feasibility of cuboid spilt test is analyzed,the relation of tensile strength and the size of cuboid is obtained,and the range of the ratio of width to height is found which can be used to relpace the one in the Base test.
分析了长方体劈裂试验的可行性 ,得到了抗拉强度值和试件尺寸的关系 ,并且找到了可替代巴西试验的长方体宽高比范围 ,对各种宽高比所得的拉应力值进行误差分析和优劣对比 ,指出了替代巴西试验的长方体最佳宽高
State analysis of inclusions in rectangular casting blank;
长方铸坯的夹杂物状态分析(英文)
An EBSD method for identifying growth direction of tetrapod-like ZnO particles;
确定ZnO颗粒生长方向的电子背散射衍射方法
The dislocation density on the sliced c-plane(0001) for both growth directions was studied with X-ray diffraction.
本实验采用提拉法,在中频感应加热单晶炉内,进行了不同生长方向蓝宝石晶体的生长工作,分别取[11-20]和[0001]生长的晶体c面(0001)的晶片。
Optimal growth direction of copper single crystal.
结果表明:在一定的牵引速度下,纯铜线材晶粒生长的特征是从引晶开始阶段的等轴多晶体渐渐演化为柱状多晶体,最终形成单晶体;随着线材直径的增大,起始晶粒个数在增加;生长成单晶的时间也在增加,经X射线衍射和透射电镜分析能够确定,单晶铜线材晶体择优生长方向为<100>。