烤烟漂湿育苗锯末加黄砂基质技术规程

<正>根据有关研究表明,焦甜香型烟叶的形成与湿润沙性生长环境有密切的相关性,为了推广应用烤烟漂湿育苗锯末加黄砂基质技术,解决宜宾烤烟生产上存在的漂浮育苗成本高、根系活力弱、还苗期长、成活率低、抗逆性差(特别是抗旱性)的实际问题,打造出宜宾特色的焦甜香型烟叶,特制定本技术规程,供     

浅析温岭沿海运砂船船员考证存在的问题及对策

温岭市历来是一个黄砂等建材资源贫乏的地区,建筑所需的黄砂绝大部分需通过海运从临近周边的温州、宁波、福建等地运入,其中温州约占了80%多。这些从事黄砂运输的船舶大多以500总吨以下沿海运输船退下来为主,普遍船龄偏大、导助航设备不齐、安全设备简陋。船东为了节省成本,追求利益最大化,在船员雇佣上往往大做文章,要么减少配员,要么以低等级船员代替较高一级的船员或者找一些工资少、文化程度低、航海技能差的无证人员或渔业转产人员任职,以尽量减少     

掺加黄砂对水泥稳定碎石基层性能的优化

本文结合公路水泥稳定碎石基层的施工,对不同黄砂掺入量的水泥稳定碎石基层配合比进行了验研究.试验结论表明合理的黄砂掺入可以有效的改善水泥稳定碎石基层的性能.     

Transport of Yellow Sand in Stratified Flow over an Isolated Mountain Ridge

The transport of yellow sand over mountain regions in the presence of internal gravity waves has been investigated numerically. The motion of yellow sand particles has been simulated in a Lagrangian frame of reference by solving the time-dependent Reynolds averaged Navier-Stokes equations. An implicit time integration in a fitted body grid arrangement was used to simulate the stratified flow over an isolated ideally bell-shaped mountain. The transport and deposition of particles of various sizes, and of the altitudes where particles were released have been analyzed. Particular attention was given to transport patterns of different sized particles in various atmospheric conditions. The results show that the particle size and the re-lease altitude are both important factors in determining the trajectories of the particles. Small particles tend to be transported a long distance over the mountains, whereas heavier particles settle down around the re-lease source. Due to the existence of an internal gravity wave, the particle release altitude affects the trajec-tory of the particles. The analysis and results provide a very useful tool for the study of atmospheric flow and transport of pollutants over real topographies.