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Based on the second- and fourth-order compact difference formulas for second-order derivatives and the idea of weighted average, two classes of the alternating direction implicit method are proposed for solving two-dimensional wave equation. The methods are of accuracy O (T^2+h^4) and O (T^4+h^4) respectively. Stability conditions are obtained by Fourier analysis method.

基于二阶微商的四阶紧致差商逼近公式及加权平均思想，提出了数值求解二维波动方程的2种精度分别为O(т^2+h^4)和O(т^4+h^4)的交替方向隐式格式，以及与其相匹配的第一个时间层的同阶离散格式，并且通过Foulier方法分析了格式的稳定性。

Based on wave propagation feature, this paper analyses 3D seismic migration algorithms such as alternating direction implicit method, LU decomposition method, and inverse operator approach method. The result shows that the alternating direction implicit method is fast but causes distortion in wave field extrapolation and affects image accuracy; however LU decomposition and inverse operator approach methods are fast while holding circular symmetry of wave field, and are promising in oilfield exploration and development.

在波的传播特征分析基础上，对交替方向隐式法、LU分解法、逆算子逼近法等三维地震偏移算法进行了分析研究，结果表明，交替方向隐式法虽然快捷但是在波场外推中明显产生畸变并影响成像的准确性，而LU分解和逆算子逼近法是保持波场圆对称特征前提下的快速算法，在油田勘探开发中具有较好的应用前景。

Furthermore, we constructed group explicit method, alternating group explicit method and alternating section explicit-implicit method. The last two methods are unconditionally stable. The numerical results show that our methods have good accuracy.

分析表明，通过格式在不同时间层的交替，如分组显式方法、交替分组显式方法、交替分段显-隐方法，后两种方法是绝对稳定的，而且数值试验表明计算精度较好。

Micro-voltmeter Capable of measuring either alternating or direct current voltage within an accuracy of 2%.

能测量交流或直流电压在精确度2%之内的微型伏特表。

The editing criteria of multi-satellite altimeter data are devised and data are pre-processed. In order to realize the full potential of satellite radar altimetry data, it is necessary to take into account a number of error sources and apply their associated corrections with an accuracy that is compatible with the proposed measurement precision.

分析并研究了卫星测高误差的来源及其削弱或消除方法，以用户手册的编辑标准为基础，参照并综合国际上同行的编辑方法，制定了针对不同测高数据的编辑准则，改善了各种地球物理改正的精度。

In order to study the Background of the YunGui altiplano and examine the accuracy and performance of the Global Models, EML and State Key Laboratory of Environmental Geochemistry have establishe...

经过EML和环境室国家重点实验室对均分样品的同步测量获得了~7Be和~(210)pb的大量数据，经过对比，两个实验室的观测数据一致性良好。

On the premise of ambiguity, we should pay attention to the accuracy of the language legal interpretation.

在接受立法语言模糊性的前提下，要重视立法语言的准确性和法律解释。

A Kalman filter is given to fit the systems. The feedback amendable technique of instrument errors and the accuracy assessment of fall points are also discussed.

论文建立了适用于SINS／双星组合导航系统的Kalman滤波模型，并研究了Kalman滤波模型中SINS工具误差的反馈修正方法以及弹载SINS／双星组合导航的精度分析方法。

I suggest you do the amniotic fluid or puncture, because "Tang screening" accuracy rate of 70%- 80%.

我建议你还是做羊水穿刺，因为"唐筛"的准确率为70%–80%。

And,for the purpose of improving the positioning accuracy,an improved Amorphous algorithm is described.

并对Amorphous定位算法进行改进，以提高整个网络的定位精度。

I had a lovely dog named PiPi, he was one of my best friends.

我曾经有过一只小狗，它的名字叫皮皮，它很善良，它是我最忠实的朋友。

Newly ovulated mouse oocytes were cultured in the CZB medium supplemented with different concentrations of pyruvate before treated for activation or assayed for MPF activity.

我们猜测卵母细胞在不含丙酮酸的条件下老化的更快，并且卵丘细胞可能通过消耗不含葡萄糖的CZB中的丙酮酸从而促进卵母细胞老化。