Dual Gradient drilling (DGD) is also known as Dual Density drilling, which is a new type of drilling technology for deepwater drilling.
双梯度钻井又称为双密度钻井，是一种适用于深水钻井的新型钻井技术。
A new magnetic field measurement based on the Faraday effect and the measurement of differential group delay (DGD) in fiber grating was proposed.
提出了一种利用光纤光栅中法拉第效应和测量差分群时延(DGD)的直接测量磁感应强度的新方法，给出了理论分析和实验结果。
The difficulty of solving PMD lies in its randomness of differential group delay (DGD) between the principal states of polarization (PSP) and the change.
PMD问题的最大困难在于差分群延迟(DGD)和偏振主态(PSP)变化的随机性。
In order to use DOP as PMD monitoring feedback signal, it is required to emulate the state of DGD in the transition circuitry. A PMD emulator is designed.
为了使用DOP做为PMD的监测反馈信号，需要在传输线路中模拟DGD的状态，为此设计了一个PMD仿真器。
Therefore, DGD may provide an alternative optimization method for deepwater well casing program design, which can produce remarkable economic and industrial values.
双梯度钻井为深水钻井井身结构设计提供了一种新的优化方法，具有显著的经济效益和工业实用价值。
And considering the features and particular requirements of deepwater drilling, a program for deepwater DGD well casing program design and optimization is developed.
结合深水钻井的特点，考虑钻井施工的特殊要求，开发了深水双梯度钻井井身结构设计及优化程序。
Electrical power, changing with differential group delay (DGD) and detected from an optical communication link, can be used as feedback signals of compensating for PMD.
光纤通信线路检测到的电功率随差分群延迟变化，可以作为PMD补偿的反馈控制信号。
It is important to know how does the degree of polarization (DOP) change with differential group delay (DGD) when DOP is feedback information for adaptive PMD compensation.
在用偏振度作为反馈信号的动态偏振模色散补偿系统中，偏振度与差分群延时的关系对于准确快速的动态偏振模色散补偿很重要。
It is important to know how does the degree of polarization (DOP) change with differential group delay (DGD) when DOP is feedback information for adaptive PMD compensation.
在用偏振度作为反馈信号的动态偏振模色散补偿系统中，偏振度与差分群延时的关系对于准确快速的动态偏振模色散补偿很重要。
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