二次差

分别通过对静态数据和星载数据进行仿真计算分析，提出了利用运用观测值的组合二次差分与电离层残差法联合进行星载GPS载波相位周跳探测及修复的方法；

According to the imitation computation and analysis , bring forward using the double difference of the observation value and the ionosphere remnant way to detect and repair the cycle slip .

提出了用二次差分矩阵法（SDMM）和频谱匹配法（FDMM）进行目标定位和参数估计。

Designs the second order difference matrix method ( SDMM ) and frequency domain matching method ( FDMM ) to solve the localization and parameter estimation problem .

基于二次差频的多频连续波测距方法研究

Study on Multiple Frequency CW Ranging Method Based Quadric Difference Frequency

提出了一种基于二次差频测距的新方法。

A new ranging method based on quadric difference frequency is presented .

多频连续波雷达二次差频测距法的改进

Improvement of Quadric Difference Frequency Base on Multiple Frequencies CW Ranging Radar

二次差频测距具有原理简单、接收机和发射机设计相对容易等优点。

The former has the advantages such as simple principle and easy design of receiver and transmitter .

用于视频镜头突变切换检测的二次差分法和像素点匹配二次差分法

Twi - difference Algorithm and Pixel - matching Twi - difference Algorithm for Video Abrupt Shot Change Detection

但经过二次差分分析后发现，在800～300~C温度区域往存在着一个二阶差分（绝对值）最大值，即在此温度区间出存在一个非常显著的曲线拐点。

By analyzing Twi-differential algorithm , a very marked inflexion can be found on the temperature zone of 800 ~ 300C .

首先使用改进了的像素匹配二次差分法结合双阈值法进行镜头突变和渐变的检测，然后对镜头内的帧间距离进行判断来提取关键帧；

The pixel-matching two-difference algorithm and two histogram comparison are used for shot detection , a method of extraction shot key frame based on distance of adjacent frame is presented .

证明了基于停线的局部平方可积强鞅的二次变差的存在性，得到了重要的Burkholder-Davis-Gundy不等式。

The existence of the quadratic variation of local square integrable strong martingales is proved . The important inequality of Burkholder Davis Gundy is obtained .

两点边值问题的二次广义差分法

Second Order Generalized Difference Method for the Two Point Boundary Value Problem

二次平差法在测距仪精度估计中的应用

Application of Two-Times - Adjustment in Accuracy Estimation of EDM

基于二次帧差与窗口最大值的镜头边界检测方法

Shot Boundary Detection Based on Twice Difference and Window-Difference Maximum

一种基于二次帧差的突变镜头检测方法

A Quadratic Difference-based Method for Abrupt Shot Change Detection

自适应二次变异差分进化算法

Differential Evolution Algorithm with Adaptive Second Mutation

由此确定了通过测量二次电位差求解地层电导率的理论基础。

Consequently , the theory can be determined of deriving correct formation electric-conductivity from secondary electricpotential difference .

基于相位干涉仪阵列二次相位差的波达角估计算法研究

A New Algorithm for Estimation of Direction of Arrival Based on the Second-Or der Difference of Phase of Interferometer Array

其基本思想是：利用二次帧差求交集得到单帧的运动信息；阈值化得到帧差掩模图像；

The basic idea of the method is : frame mask image can be achieved with a threshold from moving information got by intersections of twice frame difference images .

通常的镜头检测方法都是利用帧间差来计算镜头边界的检测阈值，该文提出了一种基于二次帧差的突变镜头检测方法。

Shot detection method often uses difference between frames to compute boundary detection threshold . In this paper , A quadratic difference based method for abrupt shot detection is presented .

针对突变和渐变的特点，提出了一种适合突变检测的二次帧差法和适合渐变检测的窗口最大值法。

According to the characters of abrupt change and gradual change , a twice difference based method and a window-difference maximum based method are proposed for abrupt change detection and gradual change detection separately .

解双调和方程的二次混合广义差分法

The Quadratic Mixed Generalized Difference Method for Biharmonic Equations

提出一种基于群体适应度方差自适应二次变异的差分进化算法。

A new adaptive second mutation differential evolution algorithm ( ASMDE ) based on the variance of the population 's fitness is presented .

采用二次曝光全息差分干涉术测定了大尺寸光学玻璃的自重形变和负荷形变所引起的折射率变化。测量精度为±1×10~（-6）。

The refractive index change of optical glasses caused by self weight and external force has been measured using double exposure holography with an accuracy of ± 1 × 10-6 .

本文针对一类非饱和土壤水流问题，提出了基于二次插值的特征差分格式，得到了严谨的L2模误差估计。

In this paper , a characteristic finite difference method based on quadratic interpolation for an unsaturated soil water flow problem is studied . L2-error estimate is derived .

对流扩散方程的二次单调插值特征差分方法

Quadratic monotone interpolation characteristic difference method for convection diffusion equation

具有二次函数型协差阵的多参数指数族

The multiparametric exponential families with quadratic covariance-matrix functions

为克服其不足，建立和研究了二次单调插值特征差分方法。

The quadratic monotone interpolation characteristic difference method is proposed to overcome these defects .

基于二次代数样条差分插补的平面参数曲线数控加工

Research on NC Machining of Plane Parametric Curve Based on Difference Interpolation of Conic Spline

二次定权平差法在边角网平差中的应用

Application of Two-time-weighting Adjustment in Triangulateration Network

芯壳层熔体的离模膨胀取决于其内外表面熔体的二次流动效应之差。

The die swell of core melt , skin melt mainly depend on the difference of melt secondary flow effect between internal surface and outside surface .