平行双线

大口径、高工压、平行双线PCCP在大型引水项目中是理想的选择，文中介绍了平行双线PCCP在特殊地质条件下的施工全过程，可供同类工程参考和借鉴。

The parallel double PCCP with large diameter and high pressure is the ideal selection in the large-scale water diversion project . In this paper , the whole construction process of parallel double PCCP in the peculiar geology condition is introduced .

多分支平行双线输电线故障的节点电压分析法

Node Voltage Analysis Method of Fault on Parallel Double Transmission Lines with Multi-Branches

本文针对多分支平行双线输电线提出了一种新的故障定位方法。

This papaer presents a new fault location algorithm for multi-branch parallel-paired electric power lines .

非对称平行双线传输线单位长度电容的精确计算

The Exact Calculation of the Capacity of Unit Length of the Asymmetric Ribbon Type Feeder Transmission Line

对水平平行双线顶管之间的相互作用进行了分析，提出了横向扰动区范围的计算公式。

The interaction of two level parallel pipe jacking is analyzed ; and the calculation of lateral disturbance scope is advanced .

采用印制在介质板双面的平行双线传输线对天线阵列进行馈电，输入端使用渐变传输线进行阻抗匹配。

The parallel double transmission line , printed on the both sides of the substrate is utilized as feed line , and a tapered transmission line is employed for impedance matching .

根据等角螺旋天线的特性，采用一种阻抗为指数渐变的微带线&平行双线形式的宽带巴仑，并采用50Ω同轴线馈电。

To match the character of the Planar Equiangular Spiral antenna , its balun is microstrip line-parallel wire which is exponentially gradual type and the antenna was fed by 50 ohm coaxial-cable .

用Cassinian变换分别计算了椭圆波导、茧形波导的截止波长与色散曲线，以及屏蔽平行双线高阶模的截止波长。

The cutoff wavelengths and dispersion curves of elliptic and of cocoon section waveguides are calculated , and the cutoff wavelengths of high order modes of shield two parallel lines are also given by this method .

封口缝合自动包装机，可同时缝制两条平行的双线链式线迹，具有更佳的密封性。

Model GK8-24 double-needle four-thread bag sewing closer adapted two paralleled double thread chain stitch with auto-cut system .

通过对传统的平行耦合双线结构进行修正，获得性能良好的叉形谐振器，并由此设计新型结构的滤波器。

Through modifying on the traditional parallel-coupled two-line structure , the fork-form resonator with good electrical performances is obtained , and the novel filter from the fork-form structure can be designed .