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。

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。

Firstly the circuit design of the instrument are described detailedly including the circuit of serial communication interface the circuit of sweep signal generator the circuit of amplitude measurement the circuit of phase measurement .

首先，详细探讨了了虚拟频率特性测试仪的控制、串行通信接口、数控 扫 频信号源、幅值测量、 相位测量等电路的设计。

In the sweep phase the JVM goes through the heap and removes all the objects that still have the mark bit in place ; these objects are no longer referenced or used .

在 sweep 阶段，JVM遍历整个heap并删除仍具有标记bit的所有对象；这些对象不再被引用或使用。

According to the demand of sweep signals given the design of sweep module based on direct digital synthesis . In order to realize a beamed seismic wave put forward the method of time-delay and controlling the beginning phase .

分析了系统对扫描信号的要求，给出基于直接数字合成（DDS）的 扫描模块的设计，提出用延时和直接控制初始 相位的方法实现地震波定向。

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。