周期

This paper investigates the orbits of sub-harmonic and chaos in power system under periodic and quasi-periodic perturbation .

研究了电力系统在周期和准周期扰动下的次谐和混沌轨道。

The correlation detection using the periodicity of the direct sequence autocorrelation function can estimate the symbol period at intermediate frequency or at baseband. Simulation results indicate that the former is superior to the latter when the demodulated frequency is unequal to the carrier frequency.

时域相关检测方法利用扩频信号的周期自相关特性，能在中频和基带对扩频码周期进行估计，仿真结果表明中频检测时性能较好。

Variation of relief and its reoccurrence were analyzed with 1∶10 000 DEM by harmonics analysis method and periodogram.

结果表明，利用谐波分析和周期图分析均可得到侵蚀沟的分布周期。

The bias of cyclic periodogram with ssinc window is analyzed in both spectrum frequency direction and cycle frequency direction, and that the TA cyclic spectrum estimation is unbiased is analyzed. The average method of cyclic periodogram is also derived in terms of STFT.

论文中通过分析加ssinc窗的循环周期图在谱频率方向和循环频率方向的偏差，表明TA循环谱估计是无偏估计，并根据STFT方法，推导了使方差得以减小的平均循环周期图方法。

For describing sampling system of mechanical equipment, the analysis method based on long period and phase diagram is used.

对机械设备采样系统提出了采用相图和长周期分析的方法，将相图和周期分析思想引入机械设备系统分类描述。

The instrument simultaneously sample for three phase voltage and current. Rotary photoelectric coding switch and LCD are used for human-computer interaction. it makes the interface compact and efficient. Utilizing the function of positive and negative edge trigger of the programmable counter array unit in MPU, signal zero-cross is captured for the phase detected based on double way. The software synchronism sampling method based on real-time parameter self-optimizing minishes period truncation error, and the measurement accuracy is improved. The digitization power measure imports traditional two-unit and three-unit methods and expands application range of the instrument. The capacity is discriminated by soft ware table-look-up on the load loss. The value of a quantity is converted to the value when reference temperature (75 ℃) from test temperature.

该仪器具有以下特点：仪器对三相电压电流同时采样；基于旋转式光电编码器和液晶显示屏的人机交互界面简洁而高效；可编程计数器阵列PCA"捕获"信号的过零点用于双向过零平均鉴相，得到准确的相位差和周期；基于实时参数自寻优的软件同步采样，有效地减小了周期截断误差，提高了测量准确度；数字化功率测量引入了传统的二表法和三表法，扩展了仪器的使用范围；实际容量根据负载损耗用软件查表的方法来判别；测量值已从试验温度折算到了参考温度(75℃)时的值。

In constant 25 ℃, FTHEB 1001 will bloom under the photoperiod of

在系列的光周期实验中，以10 L /14 D光周期处理100天下，植株的生物量最高。

Based on the results, some points of view about the research of HPGMR and its significa tion in the research of photoperiod were preposed.

探索了与光周期反应过程有关的叶片特异蛋白的变化，对HP〓MR的研究及这一材料在光周期现象研究中的意义提出了一些看法。

GmFT is a key gene for soybean photoperiodic reaction, and the expression level and pattern of this gene are regulated by photoperiodism.

GmFT基因在大豆光周期反应中起关键作用，其表达水平和表达模式受光周期直接调控。

A Planetary Motion Ratio is the ratio of one planet's period (time to revolve once around the sun) and another planet's period.

行星间的移动周期比例指的是各单一行星环绕太阳的周期的相互比例。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。