非稳态噪声

方法根据噪声性耳聋的发病率与其影响因素之间存在的映射关系，建立反向传播神经网络（BP神经网络）模型，用于非稳态噪声性耳聋发病率的预测。

Methods According to the mapping relation between the incidence rate of the noise deafness and their factors , the model of BP neural network was established to forecast the incidence rate of deafness induced by instable state noise .

非稳态噪声干扰组动物脑组织中的SOD活性水平显著低于对照组（P<0.01）；其中10d组下降最为明显。

The concentrations of LPO in the brain tissues of 5-day group and 10-day group were significantly lower than those of the control group ( P < 0.001 ) .

本文报道了528名接触非稳态噪声的冷作工、锻工听力损失的调查，以接触噪声在70dB（A）以下的机关干部95名作对照。

The hearing loss among 528 cold workers and forgers exposed to unsteady noise was studied . 95 engineers , exposed not more than 70 dB ( A ) were taken as control .

非稳态噪声性耳聋数学模型研究

Study on Mathematical Model of Deafness Induced by Unsteady Noise

非稳态噪声对大鼠自由基和记忆功能的影响

The influence of unstable noise on the free radical and the memory function of rats

528名接触非稳态噪声听力损失调查及预测方法的探讨

Study of hearing loss among 528 cases exposed to unsteady noise and its predictive method

[目的]观察和比较接触稳态噪声和非稳态噪声工人个体之间、工作日之间个体噪声暴露的特点和规律。

[ Objective ] To observe and compare personal noise exposure level variations between workers and workdays .

同时非稳态噪声听力损伤比稳态噪声严重。

Meanwhile , hearing loss caused by unsteady noise is more serious than that caused by steady noise .

目的提高非稳态噪声性耳聋发病率预测精度。

Objective To improve the forecasting precision of the incidence rate of deafness induced by instable state noise .

基于人工神经网络的非稳态噪声性耳聋发病率预测模型的研究

Research on forecasting model of incidence rate of deafness induced by instable state noise based on BP neural network

目的探讨非稳态噪声对大白鼠记忆功能的影响及可能的自由基介导损伤机制。

Objective To explore the influence of unstable noise on the memory function of rats and the possible free radical-mediated injury mechanism .

故认为，该方程式可作为预测非稳态噪声作业人员听损发生率的预测方法。此方法符合实际，简单易行，具有实用价值。

The equation might be used as a method for predicting the hearing loss rate of the workers exposed to unsteady noise .

[结果]两组工人个体噪声暴露的时间图显示其工作环境噪声性质分别为典型的稳态噪声和非稳态噪声。

[ Results ] The result showed that the textile workers exposed to continuous noise , and the mechanical manufacture workers exposed to non-continuous noise .

结论非稳态噪声干扰可以损伤动物记忆功能，自由基可能是介导损伤的重要因素之一。

Conclusions The interference of unstable state noise could induce the decrease of memory function and free radical may be an important factor of mediated injury .

方法选择有噪声作业的3个场所，且噪声是不连续、非稳态噪声，分别用瞬时测定方法和等效连续A声级测定方法对噪声强度进行测定。

[ Methods ] Instant monitoring and equivalent continuous A-weighted sound pressure level monitoring were applied to monitor the noise intensity in 3 workplaces with incontinuous and unstable noise .

结论非稳态噪声、高频噪声引起的听力损伤比稳态/中、低频噪声引起的听力损伤严重。

[ Conclusion ] Hearing loss caused by unsteady noise and high frequency noised is more serious than that by steady noise or noise of medium and low frequencies .

因此得出结论：①非稳态噪声可以对动物行为产生影响，并随着噪声暴露时间的延长而增强；

The following conclusions were : first , non steady state noise had great influence on animal behavior , and the longer the exposure was , the greater the influence became .

课题结合国家自然科学基金项目《发动机过渡工况排气噪声半主动控制装置与技术研究》，针对现有消声器对内燃机低频排气噪声控制不足的缺点，提出了专门用于内燃机非稳态排气噪声控制的半主动消声器。

This topic is combined with the National Natural Science Fund Project " Semi-Active Control devices and technology research for the Transition Condition Engines Exhaust Noise " . The shortcoming of the existing mufflers is that the low-frequency exhaust noise of internal combustion engine can not be faultlessly control .

目的评价工作场所非稳态生产性噪声对作业人员健康的影响。

Objective To evaluate the effects of non-steady noise produced in the work places on the health of workers .

针对现有技术中所存在的不足之处提出一种新型半主动旁支管消声装置。该装置可以满足变工况状态下非稳态低频排气噪声的控制要求。

For existing technology that existed in the inadequacies , a new type of semi-active bypass duct silencing equipment satisfy the variable condition of the device state of non-stationary low-frequency exhaust noise control requirements .