查询词典 noise

Among these environment protection problems, traffic noise has a closerelationship with people's daily life and it attracts more and more concern. A lotof countries make a great deal of study to find out that the tread pattern noise isthe main source of traffic noise when car at speed above 70km/h.

在这些环保问题中，汽车噪声污染是与人们的日常生活息息相关的，越来越为全世界所关注，许多国家为此进行了大量的研究，发现当车速高于70公里/小时时，轮胎花纹噪声便成为车辆噪声的主要来源。

In the environment where it is higher than thermodynamics zero degree, current pulse of faitness is produced by the movement electron in the resistance, it forms the noise current of resistance by addition, the higher the temperature in resistance is, the acuter the electron movement will be, the bigger the noise current will be, therefore the resistance of the thermal noise current is formed.

作者单位：（攀枝花学院电气信息工程学院，四川攀枝花 617000）摘要：在高于热力学零度的环境下，在电阻体内存在大量由运动电子而产生的微弱电流脉冲，经过迭加形成电阻的热噪声电流。

Wheel/rail noise of the high-speed slab track on concrete bridge and that of the urban elevated supporting block track are predicted respectively. Noise of the slab track, compared with that of the ballasted track, is more severe. The noise of the slab track is about 6.2dBA higher than that of the ballasted track for the receiver nearby the rail, and about 3.5dBA higher than that of ballast track for the receiver

对降低高速铁路桥上板式无碴轨道及城市轨道交通桥上支承块式无碴轨道轮轨噪声的技术措施进行了研究，包括：(1)分别就板式轨道和支承块式轨道结构参数的低噪声设计原则进行了研究；(2)对几种典型的新型轨道用吸声材料的降噪效果进行了分析，结果表明降噪效果显著；(3)就声屏障高度、位置、形状以及声屏障内侧敷设吸声材料对降噪效果的影响进行了分析，结果表明：声屏障越高、越接近轨道，降噪效果越好；声屏障内侧敷设吸声材料，可降低钢轨近旁噪声2.0～3.0dBA，可降低近地面噪声约1.5～2.0dBA

For certificating the efficiency of this design method, Gaussian weighted median filters are adopted to remove well known channel noise, i.e., pepper and salt noise and uniform distributed impulse noise, in this framework.

该设计方法可以推广应用到其它具有适应性的去噪滤波器之上，使它们对不同类型、不同强度的信道噪声进行更柔性化的处理。

The algorithm demarcates impulse noise to separate the two kinds of noise in each part by noise detection.

采用自适应中值滤波算法滤除脉冲噪声，有效地克服了中值滤波的不足。

This research main of research the content aim at the system noise of the orbit conveyance namely it become grind to judge because of carrying on, and through analysis valuation, the draw-up derails the prevention and cure counterplan of orbit noise, and to part prevention and cure the result measurement of counterplan do an initial analysis ratio to, distinguish a counterplan and become because of theoretically and the result ratio on the actual situation to with provide the best project of noise prevention and cure.

本研究主要的研究内容即针对轨道运输系统噪音之成因进行研判，并经分析评估，拟定出轨轨道噪音的防治对策，并对部分防治对策的结果量测做一初步分析比对，厘清对策与成因在理论上及实务上之成效比对，以提供噪音防治之最佳方案。

The communication technology used in GPS is a direct sequence spread spectrum structure. Using C/A Gold codes, it can cope with wideband noise (such as thermal noise and channel noise) or low power narrowband interference by its processing gain. But DS-SS can not reject high power narrowband interference completely. So we need an anti-jamming filter to reject the narrowband interference by using adaptive filters prior to dispreading.

它是利用直接展频的一种架构，因此，此系统能藉由C/A码的展频处理增益，来对付ㄧ些宽频的干扰或是低能量的窄频干扰，但是它无法应付高能量的窄频干扰，因此我们需要一个抗干扰滤波器在解展频之前来先将干扰去除。

AR model is applied to identify the noise source for enigne. Through the results of noise signal process, it shows that it is practical and credible to use AR model to study engine noise. Through the theoretical analysis, according to the specific engine structure, the SEA equation is formulized. The method of SEA sensitivity is brought forward on the basis of the sound power function.

从理论分析入手，结合具体的发动机产品结构，建立了结构噪声分析的统计能量方程，提出了基于声功率函数的统计能量灵敏度分析方法，把发动机的外在表现和内在因素直接联系起来，分析了系统主要参数对系统声功率的影响程度，得出了一些实用性的定性结论。

In order to enhance the image with better anti-noise ability,this paper proposes a image pre-processing algorithm based on lateral inhibition and adaptive filter,which can not only outstands the image'outline,but also eliminates the noise by adaptively changing the model parameters accordingly to the local image's mean,variance and the noise variance.

为了既能增强图像，又具有较好抗噪性能，提出一种基于侧抑制网络和自适应滤波相结合的图像预处理算法，不仅突出了图像的轮廓，而且能根据图像的局部均值和方差以及噪声方差的不同，自适应地改变模型的参数来消除噪声。

This article introduces the structure, principles and performance of several low-noise gear pumps, analyses that gear pump is the noise source in the new internal combustion forklift and battery forklift, provides some methods which can reduce the gear pump noise, and establishes the matching relation between gear modulus and pressure angle of the gear pump, which is applied to the new internal combustion forklift and forklift battery.

摘 要：本文介绍几种低噪声齿轮泵的结构、原理和性能，分析了新型内燃叉车和电瓶叉车中齿轮泵是噪声源，给出了可降低齿轮泵噪声的方法，建立了该种齿轮泵的齿轮摸数和压力角匹配关系，并在某新型内燃叉车和电瓶叉车上得到应用。

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。