叠前逆时偏移需要计算成像点的初至时间。
Prestack reverse time migration requires computing the first breaks time of imaging points.
本文提出一个用折射波初至时间计算静校正量的新方法。
This paper presents a static correction method by using the first-arrival times in raw seismic data.
在地震资料处理中，正确的初至时间，是解决复杂地表静校正问题所需的关键参数。
In seismic data processing, the accurate first break time is the key parameter to solve static correction problems of complex surface.
本文提出一种将局部算法与扫描算法相结合的、用有限差分解程函方程求取地震波初至时间的方法。
A new technique is given here, which combines partial algorithm with scanning algorithm and obtains wave arrival times by solving eikonal equation with the use of finite difference method.
参观滕王阁的最佳时间是3月至5月，以及9月至11月初。
The best time to visit the pavilion falls in March to May and September to early November.
通过缓凝三元复合制成缓凝高效减水剂，延长初凝时间至20小时以上，并且对混凝土后期强度无副作用。
Mix with setretarder could make compound dispersants setretarder superplasticizer which could extend initial setting time up to 20h and no negative effect on late compressive strength.
尼莫地平可使脑出血后脑血液动力学参数的改变程度减轻，恢复至病初水平的时间缩短。
Nimodipine can reduce not only the degree of hemodynamic change but also shorten the time of restoration.
采用时间项技术的三维初至折射波静校正方法在求解大型方程组时由于方程组的病态性质将遇到困难。
The 3-d first break refraction static corrections adopted time-term technique has difficulty in solving large-scale set of equations because of ill-conditioned property of set of equations.
红海滩四月初为嫩红，渐次转深，十月由红变紫，最佳观赏时间为五月至十月。
In the early of April, Hong HaiTan is soft red, then deeply until turn purple in October. The best season for you to come here is from May to October.
数字记录的初至波早于模拟记录，且持续时间较长，大部分的数字地震震级比模拟记录、标准震级小。
The first array wave in digital record is earlier than that in analog record, and with longer duration. It also found that the most of the ear...
时间系数的小波分析表明其具有2 ~4年的周期，这一周期成分在1950年代前期和1990年代末至21世纪初这两个时段比较显著。
Wavelet analysis of time coefficients indicates that it has the cycle of 2-4 years and the cycle component is more significant in the early 1950s and from the late 1990s to the early 21st century.
时间系数的小波分析表明其具有2 ~4年的周期，这一周期成分在1950年代前期和1990年代末至21世纪初这两个时段比较显著。
Wavelet analysis of time coefficients indicates that it has the cycle of 2-4 years and the cycle component is more significant in the early 1950s and from the late 1990s to the early 21st century.
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