环境噪声

Based on discrete chaotic signals, an approach to calculating the noisy performance of the antipodal chaos-shift-keying system with a coherent correlator under a AWGN and multiuser environment is presented.

基于离散混沌信号，提出一种在AWGN环境中双极性相干CSK系统多用户噪声性能的分析方法。

For practical systems it is necessary to make speech recognition systems robust to interfering noise, different speaker and easy confusable phonemes.

系统的鲁棒性问题是语音识别实用化的关键，它包括非特定人语音识别，混淆词语音识别和噪声环境下的语音识别三个基本问题。

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

In the image by adding Gaussian random noise source code in the MATLAB environment to achieve.

在图像中加入随机高斯噪声的源代码，在MATLAB环境下实现。

Prospect future, super voice the wave spread the feeling machine conduct and actions a kind of new count for much and useful tool and will have very big development space in everyone's noodles, it wears the dynasty more high to position the direction development of the high accuracy to develop increasingly by satisfy of social need is basic such as the development trend of the sonar is:Develop to have higher fixed position accuracy of passive measure to be apart from sonar to carry out the demand of whole concealment attacks by satisfying weapon in water;Continue to develop the submarine of the adoption low frequency line table examination to drag the line array sonar, carry out super long range of passive probe into and identify;Develop the submarine sonar of the more suitable for neritic work, resolve the target in the neritic water to identify a problem especially;Lower a submarine strongly from the bad voice, the work environment of the improvement submarine sonar.

展望未来，超声波传感器作为一种新型的非常重要有用的工具在各方面都将有很大的发展空间，它将朝着更加高定位高精度的方向发展，以满足日益发展的社会需求，如声纳的发展趋势基本为：研制具有更高定位精度的被动测距声纳，以满足水中武器实施全隐蔽攻击的需要；继续发展采用低频线谱检测的潜艇拖曳线列阵声纳，实现超远程的被动探测和识别；研制更适合于浅海工作的潜艇声纳，特别是解决浅海水中目标识别问题；大力降低潜艇自噪声，改善潜艇声纳的工作环境。

The external circumstance such as temperature and stress can induce nonreciprocal phase noise, which restricts the developing of high precision gyro.

光纤环所处的环境因素，如温度、应力引起的非互易性相位噪声，制约了光纤陀螺向高精度、实用化的发展。

IN this study, normal aged guinea pig do animal model of presbycusis to observe morphologic and hearing physiological changes of hair cell.

本实验选用36只在低噪声环境下喂养的豚鼠，将其随机分为碟脉灵实验组和生理盐水对照组，测定听觉脑干诱发电位。

Objective To evaluate the effect of tetramethyl pyrazineon noise induced hearing loss in hypobaric environment.

目的探讨川芎嗪对低气压及噪声环境下听阈阈移的影响。

Based on theories and methods of ecological economics, we explain the functions of ecosystem services in Chengdu city, Sichuan Province of China such as conditioning climate, fixing carbon and releasing oxygen, preserving soil, keeping waterhead, purifying environment, and restraining noises, and estimate the economic value of it.

运用生态经济学原理与方法，阐释了成都市生态系统调节气候、固碳释氧、保持土壤、涵养水源、净化环境和减弱噪声等生态服务功能，对其经济价值进行评估。

Based on research progress on economic value of ecosystem services, taking Shenzhen for instance, the authors analyze the functions of ecosystem services such as conditioning climate, fixing carbon and releasing oxygen, preserving soil, keeping waterhead, purifying environment, and restraining noises.

综述国内外生态系统服务功能价值评估相关研究进展，以深圳市为例，运用生态经济学原理与方法，阐释了生态系统调节气候、固碳释氧、保持土壤、涵养水源、净化环境和减弱噪声等生态服务功能，对其经济价值进行评估。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。