查询词典 combination frequency

In this case, the received carrier is modulated by unknown Doppler frequency and frequency rate. The estimation techniques as maximum likelihood estimator and extended Kalman filter are described and compared in our dissertation by tracking a common simulated highdynamic trajectory.

文中详细推导了任意信噪比情况下，时延和多普勒频率估计的方差下限表达式：在信噪比高于门限信噪比的情况下，具体推导了估计方差的Cramer-Rao限；在信噪比低于门限信噪比时，估计的方差下限还与失锁概率有关。

To solve the problem of automatic word extraction which is the basis of Chinese information processing, this paper presents two new methods——reverse maximum matching and frequency statistics and bidirectional maximum matching and frequency statistics.

针对作为中文信息处理基础的抽词问题，本文在作者提出的正向串频最大匹配法的基础上，提出了逆向串频最大匹配法及双向串频最大匹配法。

According to the model,to make mutual information maximum,the matching condition between optical imaging system and CCD detection system is obtained:the cut off spatial frequency of imaging system is equal to the Nyquist frequency of CCD.

利用该模型得到了互信息量最大时光学成像系统和CCD的匹配条件：相干成像光学系统的截止频率等于CCD的Nyquist频率。

The frequency at the point of maximum amplitude is close to the blade passing frequency.

首次分析了不同轴截面的压力脉动，其脉动曲线基本相同。

Answer: Shoots the frequency wave is the wave band is the 40.67MHZ electromagnetic wave, causes through the different technique to shoot the frequency wave penetration surface layer base first floor the melanophore, depth of penetration 2mm-20mm, resonates the principle through a minute small water-kettle to cause the organization to heat up to the threshold value temperature 65 ℃-75 ℃, both affects to the collagen organization, and may affect to the fat, achieved dispels wrinkles the skin, dissolves the effect which the fat loses weight, does not have any damage to the epidermis.

答：射频波是波段为40.67MHZ的电磁波，通过不同的手法使射频波穿透表层基底层的黑色素细胞，穿透深度2mm-20mm，通过分水子共振原理使组织加热至阈值温度65℃-75℃，既作用于真皮层胶原组织，又可作用于脂肪，达到祛皱紧肤、溶脂减肥的功效，对表皮无任何损伤。

Taking the items of"nominal frequency" and" adjustment coefficient " as a specification, this paper provides a practical calculation method for adjusting parameters of power frequency series resonance test equipment, which has been verified both in laboratory and on site.

引入"名义频率"和"调整系数"等参数作为量化依据，提出了一种现场调整工频串联谐振试验装置参数配合的工程计算方法，并已通过了实验室试验及现场参数配合示例的验证。

An image fusion method based on HSI transform and Laplace decomposition is proposed for multi-focus micropaleontology image fusion.Firstly images to be fused are transformed into HSI,then the I component is decomposed by using Laplacian.The high-frequency and low-frequency images are fused respectively based on Robert grads and region weighted average.Last the fused image is obtained by inversing HSI transformation.

首先对待融合的图像进行HSI变换，用Laplace算子对图像的I分量进行多级分解，分解后的低频分量和高频分量分别采用基于Robert梯度和区域加权均值的融合规则进行融合，最后再进行HSI反变换得到融合图像。

Especially , with the wide use of the low noise microwave receiver model of "low noise amplifier - mixer - intermediate frequency amplifier", the rejection to image frequency interference has become the last problem how to make the whole receivers noise low and resist interference.

尤其是随着"低噪声放大器——混频器——中频放大器"这种低噪声微波接收机模型的广泛使用，对镜频干扰的抑制已逐渐成为整机低噪声、抗干扰的最后难题。

The low/mid crossover frequency is sweepable from 60Hz to 1KHz providing an ideal frequency split between your subs and mid drivers and the mid/high crossover point is sweepable from 1KHz to 9KHz giving you enough range to effectively send an appropriate bandwidth to your mids and tweeters.

低/中交叉频率sweepable从60赫兹到1kHz时提供之间的潜艇和中司机和中/高的交叉点，是理想的频率从1kHz分裂sweepable到9KHz给你足够的范围，有效地发送一个合适的带宽和您的中频高音喇叭。

The effect due to the stability of the laser frequency is observed, and the method of minimizing the effect of frequency jitter is proposed.

对激光频率稳定性进行了实验研究，提出了测风激光雷达中去除激光频率抖动影响的方法。

The dissecting of samples in group2 were difficult. The root of pulmonary artery and ascending aorta failed to be unfolded because fibrous tissue was tough, right and left fibrous trigone were too firm to be solved by hand. Cardiac muscle fibers couldn't be stripped along myofibrillar trajectory since they were prone to break because of their friability.

组2的心脏解剖困难，表现为纤维组织坚韧，游离肺动脉非常困难；徒手无法松解左、右纤维三角，肺动脉和主动脉根部的游离非常困难；心肌纤维坚硬、质脆，解剖时容易断离成碎块，无法沿纤维走行方向剥离。

We have battled against the odds in a province that has become increasingly violent.

我们对在一个争夺日益激烈省的可能性。