高强度噪声

This passage showed us a white and Gaussian white noise generator whose density and bandwidth was adjustable, and this generator was based on FPGA. In addition, there was a system block figure and some essential in the design.

提出了一种基于FPGA硬件的，强度、带宽均可调的白噪声和高斯白噪声生成器，给出了设计的总体框图和设计中的一些要点，阐述了主要部分的原理和理论推导。

With prehensive control measures , development of technological innovation and using new chemical materials ,concentrations of dust and toxicants have significantly lowered except the noise. The characteristics of hazards in

采取综合性防治措施后，粉尘、毒物浓度明显下降，铸造作业职业危害特点是低浓度粉尘、多种低浓度毒物与高噪声强度共存。

In complicated acoustic environment where the characteristics of noise field and reverberation time are unknown, the performance of the speech enhancement methods with microphone array face a great challenge.

在复杂的声学环境中，通常噪声场特性和混响强度是未知的，这样就对麦克风阵列语音增强算法的性能提出了较高的要求。

This method can make sure the structure radiant sound status in total noise and the detail phonate part quickly and correctly.(3) Study on the control mechanism of structure noise radiated from rotary machines, we build a common model of rotary machine structure noise analysis relied on the general characters of rotary machines. Based on this model, we analyzed various influence factors to structure radiant noise using the union of revolution and numerical calculation method. We found that the joint stiffness between the rotor and the frame is the most sensitive parameter of structure radiant noise by calculating and analyzing.

根据本文对于旋转机械结构噪声控制技术的研究结果和惯性振动筛工作的特殊要求，对有关参数的选择进行了讨论，并通过试验为降低惯性振动筛噪声找到了两个新的方法：即，在轴间相对运动要求不高的情况下，可以在激振器与筛体之间安装一组减振器，通过适当选取减振器参数，既可以使机体在工作频率附近获得稳定振幅，保证振动筛正常工作，又可以使机体的高频响应减小，降噪效果显著；反之，如果轴间相对运动精度要求(来源：1aABC论文网www.abclunwen.com)较高，可以采用空心滚动体轴承，在保证滚动体强度的条件下也可以获得较好的降噪效果。

With globally industrial development there are often corrosive and harmful gas volatilizing in the course of production, detection,and experiment, which does harm to human health.

随着全球工业的发展，在生产、检测和实验过程中，经常有腐蚀性和有害气体挥发，危害着人们的身体健康，为了保证良好的工作条件和环境，必须有良好的通风设备，本公司生产的4-72型、4-62型玻璃钢通风机得到了广泛的应用，它具有耐腐蚀性能好，防雨、防晒和良好的理化性能，强度高、体积轻，排污效率可达95％以上，噪声LSA在25分贝以下，节能、运转平稳等特点。

Simulation is be done for all various noise density from 10% to 95%, and the results show that the proposed algorithm can restrain salt-and-pepper noise with detail-preserving, especi all y for high noise level.

我们对密度在10%~95%的各种噪声强度的情况进行了仿真，结果显示本文提出的算法能在有效地抑制噪声的同时完好地保持图像的细节信息，尤其在高噪声密度条件下显示了良好的噪声抑制效果和细节保持能力，显示了算法的稳健性。

The nonlinear laser beam propagation in high power laser driver and the influence of the smallscale selffocusing and phase noise on beam quality in disk amplifier have been analyzed by a linear model.

建立了一套线性的近似分析方法，研究高功率激光驱动器中强激光传输的小尺度自聚焦效应和相位噪声对光束传输和光束质量的影响，给出了系统噪声强度、B积分值与光束近场调制对比度之间的定量关系。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。