Based on these models , a main - road traffic flow model with two speeds on one dimension is designed . this model simulate the situation of one road in the city , traffic lights placed on the crossing , using the computer simulation , firstly , in the case of synchronized traffic lights , we investigated the velocity and flow of the model when the initial density , the turning probabilities , the number of the traffic lights , the green to signal ratio and the period of the signal are changed , then we have advanced some meliorate measure to traffic flow ; secondly , in the case of the traffic lights " signal update delay in turn , we found the optimal matching between the period of the signal and the delay time of the traffic lights so as to the perfect velocity and the flow of the model are attained 在此基础上，建立了一维二速主干道模型，该模型模拟了城市交通中一条主干道的交通情况，在交叉口处设置红绿灯，通过计算机模拟，首先，在交通灯信号同步更新的条件下，研究模型在改变车辆的初始密度、转向概率、交通灯个数、红绿灯信号的绿信比、红绿灯信号周期等各种情况下主干道的速度、流量的变化，根据模拟结果提出一些改善交通的有效措施；其次，在交通灯信号依次延迟更新的条件下，研究模型在参数道路长、红绿灯绿信比、交通灯个数、车辆的初始密度给定的情况下找到红绿灯信号周期和延迟时间的最佳匹配使得主干道的速度、流量达到最理想的值。
Biology enzyme is adopted to deal with the rabbit wool fibre , which changes the modality and configuration of the rabbit wool fibre , improves fibre ' s surface friction coefficient , fortifies the holding force among the fibres , enhances the spinnability , and meliorates the depilation of the rabbit wool textiles 摘要对兔毛纤维采用生物酶处理，使其形态结构发生改变，从而提高了兔毛纤维的表面摩擦系数，增加了纤维之间的抱合力，提高了纤维的可纺性，改善了兔毛纺织品的脱毛现象。
2 . the structure of purple soil is meliorated by sabaigrass . when contrast to bare land treatment and natural wild grassland treatment we knew that sabaigrass treatment and grass tree solid plating treatment reduced soil bulk density , enhanced soil capillary porosity , non - capillary porosity and porosity ratio , decreased soil sand grain content , enhanced soil clay grain and silt grain content so as to reduced the dispersal degree of soil , improved the aggregate capacity of soil , increased the amount of soil aggregate structure , meliorated the water permeability of soil , accelerated the form of good soil structure 龙须草能改善紫色土的土壤结构龙须草纯种植被和林草立体种植植被能不同程度地降低土壤容重，减少土壤砂粒含量，增加土壤的毛管孔隙度、非毛管孔隙度和孔隙比，以及增加粉粒含量，从而降低土壤分散度，提高土壤团聚性，增加土壤团粒结构数量，改善土壤的透水性，促进良好土壤结构的形成，最终提高土壤的蓄水保肥性能，增强土壤的抗蚀性和抗冲性。
Burning dme in the diesel engine can solve the problem that petroleum resources is reducing based on the long - term viewpoint , meanwhile , it can meliorate the emission pollution based on the short - term viewpoint , which develop a realistically feasible approach to solve tow big difficult problems , namely crisis of energy and environmental pollution 在柴油机上燃用二甲醚，从长远来看，可以解决石油资源减少的问题，从近期考虑，则能够改善排气污染，它为解决能源危机和环境污染两大难题开辟了一条现实可行的道路。
