差

Based on the analysis of the mutual action between CO2 fluids and sandstone, it is found that the higher content of dawsonite is the main cause for poorer reservoir properties, and the dawsonite is formed later than other authigenic minerals and no erosion occurres after the pores filling, which are the basic factors resulting in poor reservoir properties.

分析CO2流体与砂岩的相互作用发现，片钠铝石含量较高是储层物性变差的直接原因，而片钠铝石生长时间晚于其它自生矿物且在充填孔隙后没有发生溶蚀是储层物性变差的根本原因。

The error signal is smoothed by loop filter, then it is used to change the control register of interpolator and decimator: The proposed algorithm can track the frequency shift of sampling clock. The algorithm is simulated in both AWGN and multipath fading channel.

这种方法在发送端相邻载波间采用差分QPSK调制，在接收端利用QPSK的差分解调信号获得同步误差信号，从而获得关于OFDM符号同步和采样钟同步调整的算法，其特点是无需专门的同步导频信号。

To complete the Eliot quote on plagiarism:"Bad poets deface what they take, and good poets make it into something better, or at least something different."

艾略特关于剽窃的那句名言还有后文："差的诗人将别人的弄得更差，好的诗人将别人的弄得更好，或者至少能与之不同。"

Using finite difference time domain method, the electromagnetic field distribution of THz wave is simulated in a THz 2D PC splitter and by plane wave expansion method the dispersion relation and defect modes are achieved in a THz rotated PC waveguide.5. A woodpile three-dimensional (3D) PC with face-centered-tetragonal symmetry is one of the most popular 3D PCs because of its favorable band gap characteristics. Based on the woodpile fct lattice structure, we propose a novel woodpile THz lattice structure with comparatively decreased symmetry, better band gap properties and easy fabrication by varying some structure parameters.

计算结果为利用非线性光学差频方法产生THz辐射源的实验研究提供了深入和全面的理论基础；四、利用平面波展开法，通过改变二维THz光子晶体的结构参数，对二维THz光子晶体完全带隙进行了优化，分析出两种适合工作在THz波段的二维光子晶体结构；采用时域有限差分法和平面波展开法，计算出THz波在二维光子晶体"T"型分束波导，45度旋转波导中传输的电磁场分布以及缺陷模；五、Woodpile面心立方四角结构是三维光子晶体中被研究最广泛的结构之一。

In a special case of 2 dimensional variables, the probability of the positive definitiveness of the discrete sample covariance matrix is given in term of sample size and variable dimension. Based on the results, the optimal sample size is provided in this thesis.

推出了离散型样本协方差矩阵正定的充要条件，得到了求离散型样本协方差矩阵正定概率的模型，建立了特殊情况下的抽样优化模型。

The other is to analyze the distortion of cavity mirrors leading to defocus aberrations.

得到了离焦像差与腔长的特性关系和离焦像差与腔镜变形量之间的特性关系。

The performance of conventional differential demodulator is very poor in bad HF channel.

常规的差分解调器在恶劣的短波信道环境下性能很差。

Its performance is studied through simulation in bad HF channel, and comparing with the conventional differential demodulator is described.

仿真了常规差分解调器和新的差分解调器在恶劣短波信道环境下的性能对比。

This paper put forward a method called Denudation Method to compute independent closure of GPS net.

本文提出了剥蚀法计算GPS观测网独立环闭合差，这种方法利用计算机自动确定观测网中的独立环个数，并计算所有独立环闭合差。

In consideration of cost efficiency and convenience, the dermis and subcutis could be examined simply by the 3D PPG graph derived from the proposed PPG array system. According to the amplitude of 3D PPG waveforms, the situation of skin could be evaluated that the worse skin processes the larger standard deviation of amplitude.

此外，本研究提出一套新颖的光容积阵列系统，在成本效益与方便性的考量下，透过光容积阵列所得之三维光容积讯号图，针对皮肤真皮层与皮下组织进行微循环检测，并藉由不同三维光容积变化图的振幅，可推知越差的肤质，其振幅标准差越大。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。