dgd

The monitoring sensitivity will arrive to the top when DGD is about 0.5 bit period .

在差分群延迟约为0.5个位周期时，跟踪灵敏度达到最大值。

The limit of DGD monitored by DOP technique can be close to 2 bit periods if pulse width index equals to 0.45 ;

当脉宽指数为0.45时，对差分群延迟的跟踪上限高达2个位周期；

The experiment validates the filtering technique is effective for improving DGD dynamic range .

实验验证了滤波技术提高DGD响应范围的有效性。

Using DGD Embedment-Embedment Free Section Electron Microscopy Techniques to study Chromosome Scaffold

应用DGD包埋去包埋剂电镜方法研究染色体骨架

A mathematical relation between DOP and DGD is derived based on optical coherent matrix .

以光相干矩阵为基础推导了DOP与DGD和分光比之间的数学关系，对高斯脉冲的波形函数进行了计算。

The problem of low sensitivity will become severely if DOP is used as the monitor signal of DGD in SCM system .

在光副载波复用系统中若使用偏振度作为偏振模色散的监测信号将会遇到灵敏度低的问题。

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。

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。

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。

PMD impaired signals with DGD changes up to 50 ps can be regenerated by adjusting the synchronous modulation equipment parameters .

通过调整参数，可再生DGD值高达50ps的PMD恶化信号。

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。

The emulator can produce fixed DGD or DGD serials following various mathematical distributions and can randomly alter the polarization direction .

此模拟器既可输出DGD分立值或符合一定统计分布的序列值，偏振方向也可以随机变化。

Based on the conventional casing program design method and the variation rule of the EMD of DGD well , the casing setting depth calculation formula is derived .

根据传统井身结构设计方法和双梯度的井眼钻井液当量密度的变化规律，推导出套管下入深度的计算公式。

The mathematical expression of the relationship between degree of polarization ( DOP ) and differential group delay ( DGD ) for Gauss pulse is derived .

理论推导出准单色光波情况下、输入信号为高斯脉冲时偏振度（DOP）与差分群延时（DGD）关系的简明解析表达式。

From our simulating results , we know that under the same conditions , the DGD distribution trends to Maxwell distribution when the number of PMF increases ;

仿真结果表明，在相同的条件下，级联的PMF段数越多，仿真得到的DGD分布就越趋向麦克斯维分布；

Based on the expression , we get the conclusions that the relationship between DOP and DGD is decided by the width of optical spectrum and the splitting ratio .

通过对偏振度公式的理论分析，得出了DOP随DGD变化的关系由分光比以及光源的光谱宽度决定的结论。

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。

This paper presents the basic principle of DGD , and proposes equation for calculating the equivalent density of the drilling fluid in the wellbore below seabed mudline .

介绍了双梯度钻井技术的基本原理，给出了海底泥线下井眼钻井液当量密度公式。

The differential group delay ( DGD ) of PMD can quickly acquired by measuring the output state of polarization ( SOP ) of each wavelength at the same time .

该测量系统利用可旋转偏振控制器和光谱仪同时测量单模光纤中各个波长的输出偏振态，从而测量出PMD群时延差（DGD）。

In tests , the synchronous modulation method was able to regenerate DGD 0 ~ 35 ps PMD impaired 10 Gb / s signals return to zero code signals .

在实验上用同步调制的方法实现了DGD值在0～35psPMD恶化10Gb/s归零码信号的再生。

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。

Bubble rising velocity is measured with dynamic gas disengagement ( DGD ) in a pressurized bubble column , 0 3 m in diameter , 6 6m in height .

在内径03m、高66m的加压鼓泡床反应器内采用床层塌落技术测量气泡上升速率。

The probability density functions ( PDF ) of PMD vector ′ s components obey Gauss distribution and the PDF of differential group delay ( DGD ) time obeys Maxwell distribution ;

偏振模色散矢量的各个分量服从高斯分布，差分群时延服从麦克斯韦分布；

System performance is discussed from the statistical characteristic of first-order PMD , the relation of average DGD and transmission distance , PMD restrict the system etc , which are based on pulse broadening theory .

通过分析一阶PMD的统计特性，平均差分群时延与传输距离的关系、PMD对系统的限制等等，讨论了PMD对传输系统产生的影响。

This paper also described the effect of DGD and first / second order PMDs on maximum and minimum values of DOP , and the effect of optical pulse width on measuring range of DOP .

说明了DGD、一阶和二阶PMD对最大和最小DOP的影响，以及光脉冲宽度对DOP检测范围的影响。

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。

The character of polarization mode dispersion ( PMD ) in high-speed optical fiber transmission system is analyzed theoretically , and the mechanism of differential group delay ( DGD ) caused by PMD is found out .

文章从理论上分析了高速光纤通信系统中PMD的特性，得出了由PMD导致的DGD（差分群时延）的机理。

The difficulty of solving PMD lies in its randomness of differential group delay ( DGD ) between the principal states of polarization ( PSP ) and the change in PSP with time and wavelength .

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。

Simulated results indicate that the filtering technique can enhance DGD dynamic range and the narrowband filtering is better than any other three filtering techniques to increase the DGD monitor range and is fit for all the formats .

在3种滤波技术中，以窄带滤波技术适合每种码型并使用DGD响应范围最大而具有更好的优势。

The results show that conventional oilfield hydrocyclone can be used in deepwater HGS DGD , which provides a certain basis for improvement of the structure design and the performance , and reduction of the energy loss of hydrocyclone .

结果表明在深水空心球双梯度钻井中采用常规旋流分离器回收钻井液中空心球可行，同时为改进结构设计、提高分离性能和降低能量损耗提供了一定依据。