background: in the steel industry, coke-fueled furnaces are used for smelting iron ore to produce cast iron are considered as sources of annoying noise.this study aims to evaluate the noise pollution blast furnace and sound source characteristics in order to present noise control measures in the steel industry. methods: measurement of noise level and its frequency analysis was performed using s...

Problems caused by ambient air pollution on human and the environment can be averted steadily strictly monitoring of concentrations outdoor pollutants. Human activities have triggered changes in earths atmosphere. In this research, 7(Seven) selected Eleme communities, 4(four) zones each community 28(Twenty eight) sampling points all locations were assessed for CO, SO2 , NO2 NO, CO2 SPM, O2 nois...

Air is an important component for the survival of living things, especially humans. However, air quality has decreased due to pollution. The harmful elements that enter atmosphere are Carbon Monoxide (CO), Nitrogen Dioxide (NO2), Sulfur (SO2), Particulates (PM10), and Ozone (O3). Noise defined as unwanted sound or so it disturbs endangers health. Sources noise divided into moving stationary sou...

With the rapid development of economy and continuous improvement in people’s living standards, predictions air quality index have attracted wide attention. In this paper, a new feature selection method (Pearson-MI) combined model construction (modified inverse variance method) were proposed to study (AQI) its influencing factors Changchun. The Pearson-MI selects that affect AQI Changchun City f...

Collinear coherent combination of multiple single frequency fiber amplifiers is a promising approach to realize the high power laser sources required for 3rd generation gravitational wave detectors (GWD), as long as the stringent requirements on the beam quality and noise properties can be met. Here, we report the beam quality and noise properties of two coherently combined 10 W single frequenc...