sweep phase

The big problem with mark-sweep is that every active ( that is, allocated) object, whether reachable or not, is visited during the sweep phase.

标记-清除的最大问题是，每一个活跃的（即已分配的）对象，不管是不是可到达的，在清除阶段都是可以访问的。

Like mark-sweep, mark-compact is a two-phase process, where each live object is visited and marked in the marking phase.

与标记-清除类似，标记-整理是两阶段过程，在标记阶段访问并标记每个活跃对象。

Mark-sweep and mark-compact collectors, however, expend considerably more effort examining dead objects, because they must examine every object in the heap during the sweep phase.

不过，标记-清除和标记-理整收集器要做很多额外的分析死亡对象的工作，因为在清除阶段它们必须分析堆中的每一个对象。

The constant phase sweep is made on multiple traces, and the angle corresponding to the maximum variance norm is the angle that can be used in constant phase correction of whole seismic section.

第二种是在多道记录上进行常相位扫描，用方差最大时所对应的角度作为整条剖面常相位校正的角度。

Frequency sweep signal sequence is generated from waveform memories added by counter and phase accumulator.

利用计数器和相位累加器实现对波形存储器寻址,从而产生频率扫描信号序列.