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通过在6198采煤工作面现场施工煤层注水钻孔采取煤样,实验室试验注水钻孔水压力分布、煤样含水率变化,得到了工作面煤层注水影响半径等技术参数,为采煤工作面煤层注水提供了一定的参考依据。 相似文献
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To explore the thermal responses under the non-thermal equilibrium cold environmental conditions,a laboratory study was conducted in climate chamber.The local skin temperatures and thermal sensation of 20 subjects were recorded at 10 min intervals for 90 min under air temperatures of 7.4,9.1,11 and 15 °C.The results show that both local skin temperatures and mean skin temperature decrease not only with the drop of ambient air temperature but also with the exposure time.Local thermal sensation and overall th... 相似文献
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To explore the thermal responses under the non-thermal equilibrium cold environmental conditions, a laboratory study was conducted
in climate chamber. The local skin temperatures and thermal sensation of 20 subjects were recorded at 10 min intervals for
90 min under air temperatures of 7.4, 9.1, 11 and 15 °C. The results show that both local skin temperatures and mean skin
temperature decrease not only with the drop of ambient air temperature but also with the exposure time. Local thermal sensation
and overall the thermal sensation have the similar temperature-varying and time-varying characteristics. Predicted mean vote
(PMV) model cannot correctly predict the thermal sensation under non-thermal equilibrium cold environment. The correlation
between local thermal sensation and local skin temperatures shows that thermal sensation is closely related to skin temperature.
Skin temperature is an effective indicator of thermal sensation. A linear relationship model between overall thermal sensation
and mean skin temperature, considering both ambient temperature and exposure time, was established in the non-thermal equilibrium
cold environment, which makes the evaluation of thermal sensation more objective. 相似文献
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