The acoustic properties of composite structures made a perforated panel, an air gap, and porous layer, can be studied numerically by combined use ad hoc optimization sensitivity analysis methods. methodology is briefly described systematically applied to series multi-layer configurations under manufacturing constraints. We specifically consider foam layer constant thickness presenting three dif...

In this essay, I draw from approaches in voice, music, theater, and film studies to examine four elements of sound: vocal delivery, music, special effects, and silence. Within this four-part schema, I discuss a variety of frameworks that I hope may serve as resources for those seeking to engage in both the analysis and production of sound in multimodal webtexts. Throughout the essay, I analyze ...

Using sound to complement graphics and to present data is becoming increasingly popular. Sound can potentially reveal patterns and anomalies in data that are diicult to perceive visually. Moreover, psychological studies show that some types of data are more quickly assimilated when presented with sound; an audio alarm is the classic example. Unfortunately, the lack of standards governing the so...

background: noise is one of the most important harmful agents in work environment. noise pollution in oil refinery industries is related to workers' health. this study aimed to determine the overall noise pollution of an oil refinery operation and its frequency analysis to determine the control plan for a vent noise in these industries. methods: this experimental study performed in control unit...