查询词典 noise wave

Terahertz radiation, which is a kind of electromagnetic wave between the infrared and microwave bands, belongs to far-infrared band. THz time-domain spectroscopy which developed in the 1980\'s has the advantages of high signal to noise ratio, obtaining the absorption coefficient and refractive index of the sample at one time , low energy that can not distroy the biology organise and so on.

太赫兹辐射是指频率位于微波和红外光之间的电磁波，属于远红外波段；20世纪80年代发展起来的THz时域光谱技术，具有信噪比高，能同时获得样品的吸收系数和折射率，能量低，不会对生物组织造成破坏等优点，在材料和生物学等领域得到了迅速的发展和广泛的应用。

Unless the sources of the noise and the antinoise coincide, the wave patterns will not overlap properly and the effect will be lost.

如果噪声和反噪声不同步，它们的波形将无法准确地叠加，从而失去抑制效应。

Results: This paper specifies safety limits of impulse noise and blast wave from conventional weapons of 1.5 ms

本标准适用于暴露在常规兵器发射或爆炸所产生的脉冲噪声与冲击波中的无防护人员，常规兵器的科研生产也可参照使用。

The approximate solution to FPK equation isobtained. The joint probability density function and stationary mean out-crossing rateare investigated for ship nonlinear rolling subjected to additive white noise excitation.Melnikov function and phase space flux are applied to analyze highly nonlinear rolland capsizing of ships in the random seas. The variation of phase space flux withrespect to the characteristic wave period, significant wave height and damping ofships is studied.

求FPK方程近似解，研究白噪声激励下船舶非线性横摇运动的联合概率密度函数及稳定期望穿阈率，应用Melnikov函数和相空间转移率研究船舶在随机波浪中的强非线性横摇运动及其倾覆问题，考虑波浪特征周期、有义波高及船舶阻尼特性的变化规律，推导了船舶在随机横浪中的极限波高的表达式。

Crust is used arenaceous board spray, exterior design is easy and beautiful; Muffle uses wave crest cotton, height of wave crest trough but by the client custom-built, material can use PU character rubber-plastic, yi Ke uses run-of-mill data; Use dismountable type design, facilitating fan disassembles maintenance; The product basically is used at light industrial, environmental protection, remove dust, large company of the foreign capital enterprise that low noise asks or home; Use wooden case t

外壳使用砂板喷涂，品相策划不小气好看；消音器使用波峰棉，波峰波谷程度可由客户和客商定制，材料可使用PU橡塑，亦可使用一般性材料；使用可卸货式策划，方便风机卸货修理；制品重要用在轻工、环境保护、灭尘、低噪声请求的外资公司或者境内大型公司；使用木箱包装，售后一年全保，全身有偿修理

The system is based on optical heterodyne structure, and use half wave plate, quarter wave plate and polarization beam splitter to improve the intensity of Doppler signal and signal-noise-ratio.

系统采用了外差式纵向激光多普勒测量结构，利用1/2波片、1/4波片与偏振分光棱镜相结合及外差式参考光结构，有效地提高了多普勒信号的强度与信噪比。

This thesis discussed the wave forms of the pseudo-random-code phase-coded quasi-continuous wave radar. Then studied the working process of its receiving system and analyzed its noise and clutter environment. This thesis constructed the simulation flow chart .

论文首先对伪码调相中断连续波雷达的信号波形进行分析，接著研究伪码调相中断连续波雷达数字化接收系统的工作过程及噪声与杂波环境，构建了接收系统的仿真模型。

This thesis discussed the wave forms of the pseudo-random-code phase-coded quasi-continuous wave radar. Then studied the working process of its receiving system and analyzed its noise and clutter environment. This thesis constructed the simulation flow chart .

论文首先对伪码调相中断连续波雷达的信号波形进行分析，接着研究伪码调相中断连续波雷达数字化接收系统的工作过程及噪声与杂波环境，构建了接收系统的仿真模型。

To effectively detect the ship hydrodynamic pressure signal from wind wave background, according to the characteristic difference between the ship hydrodynamic pressure signal and the wave noise, a target detection method is used on the AR model and the artificial neural network.

为了有效地从风浪背景中检测舰船水压场信号，根据舰船水压场信号和波浪噪声信号的差异，以时间序列的AR模型理论为依据，采用基于AR模型和神经网络的舰船水压信号检测方法。

The results show that using the new algorithm, veracity of arriving time for sky-wave and ground-wave can get up to 99.6% and no less than 98.6% respectively,and signal to noise ratio can be improved 6dB relative to the standard of USCG.

结果表明，利用该算法，天地波自动识别的准确率分别可达99.6%和98.6%以上，相对USCG标准可改善信噪比6dB。

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。