Objective:To understand the fundamental state of noise exposure and hearing loss of rolling steel workers,analyze and appraise them,investigate the important contribution of knowledge,attiude and practice of workers for their hearing protection, provide theory instructions for the prevention and cure of occupational noise and noise-induced deafness.

Based on the distribution of H2S in the cochlea and its effect on angiotasis regulation, plus the pivotal role that microcirculation played in noise-induced hearing loss, we observed the expression and distribution of cystathionine-γ-lyase (CSE), a H2S synthetase in mammalian, in adult rat cochlea before and after noise exposure.

According to statistic for quantity of domestic textile industry workers,length of service and survey for noise of local company,the situation of noise exposure and employees\' hearing loss were predictied base on ISO1999-1975 (E) and other related methods of prediction.

At the same time,the support of design theory and data for estimating warship s acoustical performance and developing low noise propeller can be obtained from the noise prediction The predicting method of radial noise of propeller including the trial study and theory method was introduced in this paper.

The noise prediction mechanism using Lighthill’s Acoustic Analogy was deduced in detail.

Cumulative noise exposure (CNE) were used to represent the actual exposure level of the workers.

Cumulative noise exposure(CNE)was used to represent the actual exposure level of the workers.

Cumulative noise exposure (CNE) was used to indicate the actual exposure level of the workers.

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