| 1. | Research into fpga - based frequency measurement module of equal accuracy and its implementation
的等精度测频模块的研究与实现 |
| 2. | In this paper , we proposed three approaches : watermark scrambling , amplitude shaping and adaptive prediction - based frequency domain shaping
在本文中，我们提出了三种方法：水印随机化，幅度整形和自适应预测频率域整形。 |
| 3. | Cross - correlation method used in get based frequency part and realized balancing function . gao huawei ( mechanical design and theory ) directed by vice - prof
采用互相关原理提取振动信号基频分量，计算振幅和相位，完成了动平衡功能。 |
| 4. | At last the results obtained are compared with those of t - beams , which shows : 1 ) the base frequency of t - beam and box girder bridge is different not only in the value but also in vibration direction
通过与此无关t型梁自振特性的结果进行比较，得出了一些重要结论：从t型梁到整体箱梁，梁的基频发生了改变。 |
| 5. | By means of modulus measurements of two kinds of timber , when the frequency of vibration is higher than the base frequency , the elastic modulus is increased with frequencies ; but the loss modulus decreases with frequencies
在纵振动过程中，两种木材的动弹模量随着频率的增大而增大，而耗散因子随着频率的增大而减少。 |
| 6. | Taking uplink as an example , both simplified analysis and intensive computer simulations are presented to offer comparisons among frn enhanced systems with the proposed schemes , with a known channel - borrowing based frequency planning scheme and the conventional cellular system without relaying
同时，相对于侧重覆盖面积的频谱分配方案，侧重于频谱效率的频谱分配方案的频谱复用距离较小，从而有更高的频谱利用率，其重点在于解决频谱效率问题。 |
| 7. | Basing on the operating characteristics of the pmsm machine tool spindle drive system , a novel frequency multiplication circuits which can be switch to 2 or 4 times of base frequency is proposed in the paper . it resolves the paradox of using a same photoelectric encoder under high and low speed operating condition of motors
它能够根据指令实时的对编码器反馈回来的电机速度信号进行2倍频或4倍频处理，解决了用同一个编码器来检测电机低速和高速的矛盾。 |
| 8. | 2 ) the value of base frequency , which is the first order vertical - bending vibration , is bigger in box girder bridges than those of t - beams . it shows that the vibration performance of box girder bridge is better than t - beams . 3 ) when considering the shear deformation of beam , the vibration frequency calculated by is bigger than those not considering the shear deformation
T型梁的基频为横向振动，而整体箱梁的基频为竖向弯曲振动；整体箱梁的一阶竖弯振动的频率比t型梁得到了提高；整体箱梁的动力性能优于t型梁；考虑剪切变形后，梁的自振频率降低，对于整体箱梁其降低值接近于5 ，在分析时不应忽略。 |
| 9. | The tripled frequency converter is applied to the terminal optics assemble , its main function is completing the transmission of the light and energy by the optics crystals , at the same time transforming the base frequency light into tripled frequency light . the function requires the frequency converter to have good stability and high orient precision
三倍频模块应用于终端光学组件中,其主要功能是通过两块光学晶体完成光路和能量的传输,同时将基频光转换成三倍频光,这种功能要求光学晶体有良好的稳定性和较高的定位精度。 |
| 10. | The exhaust noise contains complex noise elements , including the exhaust noise with a base frequency measured in the number of exhausts in unit time , the resonance noise of the gas column in the pipe , the gas stream blowing noise at the exhaust manifold , the exhaust gas jetting and impact noise , the helmholtz resonance noise of the cylinder , the karman eddy noise and the turbulent noise inside the exhaust system
排气噪声包含了复杂的噪声成分：以单位时间内排气次数为基频的排气噪声、管道内气柱共振噪声、排气歧管处的气流吹气噪声、废气喷注和冲击噪声、汽缸的亥姆霍兹共振噪声、卡门涡流噪声及排气系统内部的湍流噪声等。 |
