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综采面截煤产尘风流-粉尘运移规律研究 被引量:6
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作者 李红儒 沈荣喜 +3 位作者 邱黎明 侯振海 韩旭 张旋 《煤炭技术》 CAS 2019年第2期104-107,共4页
针对综采工作面截煤产尘量大的问题,利用Fluent软件模拟分析了综采面截煤产尘的风流-粉尘运移规律,重点研究了工作面不同位置粉尘横向及高度方向上的扩散规律,并与现场实测值进行了对比。研究结果表明:采煤机中心上风侧4 m到下风侧10 m... 针对综采工作面截煤产尘量大的问题,利用Fluent软件模拟分析了综采面截煤产尘的风流-粉尘运移规律,重点研究了工作面不同位置粉尘横向及高度方向上的扩散规律,并与现场实测值进行了对比。研究结果表明:采煤机中心上风侧4 m到下风侧10 m的空间为"高浓度粉尘区";从采煤机中心下风侧20 m处开始,在呼吸带高度上出现了"粉尘沉降低浓度带";采煤机中心下风侧30 m之前,粉尘沉降明显,采煤机中心下风侧30 m之后,粉尘明显向顶板扩散;数值模拟结果与现场实测结果符合较好。 展开更多
关键词 综采面 风流-粉尘 FLUENT 数值模拟
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Prevalence of low back pain among soldiers at an army base 被引量:4
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作者 hou zhen-hai SHI Jian-guo +6 位作者 YE Hong NI Zhi-ming YAO Jun ZHENG Long-bao LIU Zhi-rong GAO Ying WANG Jian 《Chinese Medical Journal》 SCIE CAS CSCD 2013年第4期679-682,共4页
Background Low back pain (LBP) is a major medical and social problem among working populations and is associated with high medical expense, loss of productivity, and disability. The aim of this study is to investiga... Background Low back pain (LBP) is a major medical and social problem among working populations and is associated with high medical expense, loss of productivity, and disability. The aim of this study is to investigate the prevalence of LBP among soldiers and evaluate the possible causative factors in military training. The results may provide an insight into changes needed in military training that will reduce the occurrence of LBP among soldiers. Methods A cross-sectional survey was conducted in a group of young soldiers in China to estimate the prevalence of LBP and evaluate possible causative factors in military training. Results The survey was distributed to 1659 soldiers, of whom 1624 responded. LBP was reported by 425 of the 1624 (26.2%) soldiers. The prevalence of LBP was higher in the armored force (51.3%) than in the artillery (27.5%) or infantry (11.9%). A multivariate logical regression analysis identified night training, 5 km cross-country race, and grenade-throwing training as military training risk factors for LBP. Conclusions The relatively high incidence of LBP among soldiers was related to night training, 5 km racing, and grenade throwing. Modifications in these training methods should enhance the health of recruits and lower the incidence of LBP. 展开更多
关键词 SOLDIERS back pain low physical fitness questionnaires risk factors
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