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1)  the principle of cyhcle
测周法
1.
This paper introduces a digital cymometer methods on VHDL using the principle of cyhcle measurement and frequency measurement,making the improvement to the traditional cymometer,achieving a 0~1 MHZ frequency range and giving the simulation results.
介绍了一种采用VHDL语言设计数字频率计的方法,利用测周法和测频法相结合的原理,对传统的频率计进行了改进,实现了0 Hz~1 MHz的频率测量范围,并且给出了仿真结果。
2)  measuring period method
测周期法
1.
Due to too much short sustained time duration of oscillation for the blades and too wide distribution of oscillation frequency over the audio frequency range, direct frequency measuring method, measuring period method and variable gate frequency measuring method were analysised,a procedure of variable gate frequency measurement has been applied to t.
由于叶片振动持续时间很短 ,且振动频率在音频范围之内分布较广 ,通过分析比较直接测频法 ,测周期法和变闸门测频法后 ,在设计以单片机为核心的测频仪时采用了变闸门测频法 ,该方法具有精度高、速度快的优点。
3)  period measuring arithmetic
测周算法
4)  cycle measurement method
周期测量法
5)  period-checking algorithm
周期检测法
1.
A symmetrical period-checking algorithm, which colors M-sets according to the period of each point in the complex C-plane, is put forward for the first time.
提出了对称周期检测法,根据各参数点的周期值对M集进行着色,并充分利用M集的对称性来减少绘制过程中计算周期时所需要的迭代运算。
6)  circle measurement
圆周测量法
1.
During the procedure of the restore and reconstruction,the method of circle measurement was used to calculate the center coordinate,the cross line was setting-out through connection survey,and then,the perpendicularity of cross line was detected.
该矿在井筒十字中线的恢复与重建过程中,利用井筒圆周测量法求证出井筒中心位置,通过建网联测刻设十字线桩,并进行了十字线垂直度检测。
补充资料:三周──法华三周
【三周──法华三周】
  ﹝出法华经玄义﹞
  法华三周者,谓佛说法华经,因声闻之人根有利钝,悟有前后,故有三周不同焉。周者,周足之义也。
  [一、法说周],法说周者,佛为上根之人,作三乘一乘说;开三乘之权,显一乘之实。即方便品中所谈是也。(三乘者,声闻乘、缘觉乘、菩萨乘也。)
  [二、譬喻周],譬喻周者,佛为中根之人,于上法说周中不悟,更作三车一车说。初许三车,是施权;后等赐大车,是显实。即譬喻品中所谈是也。(三车者,羊车、鹿车、牛车也。)
  [三、宿世因缘周],宿世因缘周者,佛为下根之人,于上法、譬二周之中,不能解了,遂说宿世,曾于大通智胜佛时,同下一乘之种,令其得悟。即化城喻品中所谈是也。
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