Sand fences made of punched steel plate(PSP)have recently been applied to control wind-blown sand in desertified and Gobi areas due to their strong wind resistance and convenient in situ construction.However,few studi...Sand fences made of punched steel plate(PSP)have recently been applied to control wind-blown sand in desertified and Gobi areas due to their strong wind resistance and convenient in situ construction.However,few studies have assessed the protective effect of PSP sand fences,especially through field observations.This study analyzes the effects of double-row PSP sand fences on wind and sand resistance using field observations and a computational fluid dynamics(CFD)numerical simulation.The results of field observations showed that the average windproof efficiencies of the first-row and second-row sand fences were 79.8%and 70.8%,respectively.Moreover,the average windproof efficiencies of the numerical simulation behind the first-row and second-row sand fences were 89.8%and 81.1%,respectively.The sand-resistance efficiency of the double-row PSP sand fences was 65.4%.Sand deposition occurred close to the first-row sand fence;however,there was relatively little sand on the leeward side of the second-row sand fence.The length of sand accumulation near PSP sand fences obtained by numerical simulation was basically consistent with that through field observations,indicating that field observations combined with numerical simulation can provide insight into the complex wind-blown sand field over PSP sand fences.This study indicates that the protection efficiency of the double-row PSP sand fences is sufficient for effective control of sand hazards associated with extremely strong wind in the Gobi areas.The output of this work is expected to improve the future application of PSP sand fences.展开更多
目的:分析应用掌侧接骨板方法治疗桡骨远端die-punch骨折的临床可行性。方法:选取我院2014年12月~2015年12月已接受掌侧接骨板治疗的远端die-punch骨折患者32例为对象。32例患者的die-punch骨折类型主要有三种,为纵向劈裂类型、掌侧类...目的:分析应用掌侧接骨板方法治疗桡骨远端die-punch骨折的临床可行性。方法:选取我院2014年12月~2015年12月已接受掌侧接骨板治疗的远端die-punch骨折患者32例为对象。32例患者的die-punch骨折类型主要有三种,为纵向劈裂类型、掌侧类型、背侧类型。治疗所用的接骨板的类型为万向双柱锁定加压类型及2.4 mm T类型。患者手术后选择性进行一些功能恢复训练,如术后1个月内行手掌和指关节的活动,术后超1个月行腕关节活动训练。对32例患者进行随访,相关内容有X片、DASH评分、腕部是否出现畸形、并发症情况、握力、腕关节活动情况。探究采用不同die-punch骨折类类型和不同接骨板类型患者之间上述指标的差异。结果:成功随访了32例患者,经X片发现骨折愈合状况良好,且关节面也较为平整,未出现并发症和腕部畸形现象。不同die-punch骨折类型和不同接骨板类型患者DASH评分、握力、腕关节活动状况差异均无统计学意义(P>0.05)。结论:应用掌侧接骨板方法治疗桡骨远端die-punch骨折具有临床可行性。展开更多
基金This research was funded by the Fellowship of the China Postdoctoral Science Foundation(2021M703466)the Basic Research Innovation Group Project of Gansu Province,China(21JR7RA347)the Natural Science Foundation of Gansu Province,China(20JR10RA231).
文摘Sand fences made of punched steel plate(PSP)have recently been applied to control wind-blown sand in desertified and Gobi areas due to their strong wind resistance and convenient in situ construction.However,few studies have assessed the protective effect of PSP sand fences,especially through field observations.This study analyzes the effects of double-row PSP sand fences on wind and sand resistance using field observations and a computational fluid dynamics(CFD)numerical simulation.The results of field observations showed that the average windproof efficiencies of the first-row and second-row sand fences were 79.8%and 70.8%,respectively.Moreover,the average windproof efficiencies of the numerical simulation behind the first-row and second-row sand fences were 89.8%and 81.1%,respectively.The sand-resistance efficiency of the double-row PSP sand fences was 65.4%.Sand deposition occurred close to the first-row sand fence;however,there was relatively little sand on the leeward side of the second-row sand fence.The length of sand accumulation near PSP sand fences obtained by numerical simulation was basically consistent with that through field observations,indicating that field observations combined with numerical simulation can provide insight into the complex wind-blown sand field over PSP sand fences.This study indicates that the protection efficiency of the double-row PSP sand fences is sufficient for effective control of sand hazards associated with extremely strong wind in the Gobi areas.The output of this work is expected to improve the future application of PSP sand fences.
文摘目的:分析应用掌侧接骨板方法治疗桡骨远端die-punch骨折的临床可行性。方法:选取我院2014年12月~2015年12月已接受掌侧接骨板治疗的远端die-punch骨折患者32例为对象。32例患者的die-punch骨折类型主要有三种,为纵向劈裂类型、掌侧类型、背侧类型。治疗所用的接骨板的类型为万向双柱锁定加压类型及2.4 mm T类型。患者手术后选择性进行一些功能恢复训练,如术后1个月内行手掌和指关节的活动,术后超1个月行腕关节活动训练。对32例患者进行随访,相关内容有X片、DASH评分、腕部是否出现畸形、并发症情况、握力、腕关节活动情况。探究采用不同die-punch骨折类类型和不同接骨板类型患者之间上述指标的差异。结果:成功随访了32例患者,经X片发现骨折愈合状况良好,且关节面也较为平整,未出现并发症和腕部畸形现象。不同die-punch骨折类型和不同接骨板类型患者DASH评分、握力、腕关节活动状况差异均无统计学意义(P>0.05)。结论:应用掌侧接骨板方法治疗桡骨远端die-punch骨折具有临床可行性。
