查询词典 noise-power-ratio

The combustion noise control is an important aspect of internal combustion engine noise control.

摘要燃烧噪声控制是内燃机振动与噪声控制领域的一个重要的研究方向。

It has proved that under the circumstance of low signal/noise rate, for either single LFM signal or multi-LFM signal, compared with traditional methods, this method can more effectively inhibit different kinds of Gaussian noise, avoid the influence of cross term and identify useful signal.

结果表明，在低信噪比情况下，无论是针对单分量LFM信号还是多分量LFM信号，该方法都可以比传统方法更有效地抑制各种高斯噪声，摆脱交叉项的影响，识别有用信号。

The paper discusses the principle of zero-phase wavelet extracted from Ground Penetrating Radar record at the base of coefficient of reflection being white noise and used to remove the random noise in the GPR signal with cross correlation filter.

该文简述了在反射系数为白噪声条件下探地雷达记录道中零相位子波的提取，并用提取的子波对探地雷达信号进行互相关滤波的方法原理及编写的相应的程序。

On the base of analyzing the main factor to the erroralarming in LPMS,the alarming theory in view of wavelet's RMS was established by choosing minor scale of relative noise as alarming datum point,and the base noise which affect alarm was checked effectively.

在分析LPMS中产生误报主要原因的基础上，结合小波时频域分析特点，提出了基于小波均方值报警理论，并以秦山核电站一号机组为例，选择相对噪声较小的尺度作为报警基准，能有效地抑制背景噪声对报警的影响。

It is the first time to calculate the near noise field with ray method, and replace the inhomogenous SSP in the vertical direction with constant SSP, while other models usually use Fast Field Program such as SARFRI to calculate the near noise field. This model increases the calculation speed about 100 times without decreasing much precision. It can meet the need of engineering.

首次采用射线模型计算噪声近场的贡献，并进一步用等声速代替有垂直分布的声速剖面，而其他模型通常采用诸如SARFRI等快速场程序计算近场的贡献；本模型的计算时间比其他模型的计算时间缩短了2个数量级，精度并未有明显损失，适合工程需要。

This is the noise and accommodate more intense because she will immediately and babies, such injury ear-piercing noises heard every day, she would really be afraid of the noise caused by their own babies to be born.

而郭女士更是对这种噪音深恶痛绝，因为她马上就要生小宝宝了，这种尖利刺耳的噪音天天不绝于耳，她真怕这些噪音会对自己即将出生的小宝宝造成影响。

Of precision electric measuring system,analyzing at length the effects of earth wire,electric field noise and magnetic field noise on the measuring results.

详细分析了接地线、电场噪声、磁场噪声对测量结果的影响，并提出解决问题的办法和保护措施。

Creation mechanism of combustion noise was discussed,and the effect of the maximum combustion pressure,the maximum pressure rise rate and high frequency pressure oscillation on diesel engine combustion noise with different pilot injection strategies adopted were analyzed.

讨论了燃烧噪声的产生机理，分析了直喷式柴油机采用不同的预喷射策略，气体最高燃烧压力、最大压力升高率及气体高频压力振荡对燃烧噪声的影响。

A Hartmann-Shack apparatus with unequal entrance and exit pupil sizes are used to investigate two different ways of reducing noise, by measuring the signal-to-noise ratios in artificial eyes.

首先，对使用偏振分光棱镜的H-S系统，在系统出瞳不变，入瞳变化的条件下测量了对应的信噪比。

There were only few cases with CBA for noise abatements in China,but the authors believe it may grow up and become an important method for environmental noise management and project development.

介绍了成本效益分析在噪声控制工程领域应用的最新国际动态，并例举了有关交通噪声的重要案例。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。