double circles meaning in Chinese
同心圆符号
Examples
- Luoyang double circle longben co . , ltd
双元围棋 - Study on precast technique for concrete segmental tube applied to double circle shield construction
双圆盾构混凝土衬砌管片预制技术的研究和应用 - In this paper we also designed the computer optical elements based on the scalar quantity diffractive theory , which can change the laser beam into a square frame . we mainly refered to the one of those improved algorithms of gerchberg - saxton ( gs ) . with the computer simulation and drawing program , the simulated diffraction patterns were gotten in this paper , the results agreed with the anticipated diffraction patterns ; in the paper we also design the computer optical elements that can shape the laser beam into a double circle shape , a lamp shape and so on
计算机模拟成像结果与预期得到的衍射图样相符合;文中还讨论了设计参数对成像质量的影响规律。同时,本文还用标量理论设计了把高斯光束整形为双圆斑形光束的计算机光学元件,文中主要是参考改进的gs ( gerchberg - saxton )算法;通过计算机模拟,得到了计算机光学元件表面的相位浮雕图。 - Combined with the full scale models tested in - situ of prestressed concrete penstock with double circle unbonded strands and single circle bonded strands of xiaolangdi multipurpose dam project of yellow river , the advantages and disadvantages of two different prestressed systems are analyzed , the concrete stress distributions of the prestressed concrete penstock are induced and summarized during the whole tensioning strands stage . the consistence among the test results , the theory calculating and the three dimensional finite element analysis is proved . therefore , the theoretical method of prestressed concrete penstock is feasible
结合黄河小浪底水利枢纽工程在施工现场进行的采用双层双圈环形无粘结预应力钢绞线和单圈有粘结预应力钢绞线对排沙洞衬砌混凝土施加预应力的1 ： 1模型试验，对比分析了两种后张预应力施工体系的优劣，归纳总结了预应力筋束张拉过程中预应力混凝土压力管道结构管壁混凝土的内力分布规律，验证了模型试验实测数据、理论计算和三维有限元分析结果的一致性，确定了预应力混凝土压力管道理论计算方法的可行性。