临界速度

A new mechanism of the subset combination method is applied simultaneity , which hybridizes the mechanism of the pheromone trail updating with the combination mechanism of scatter search to generate new solutions .

采用一种将蚁群算法的信息素更新技术与分散搜索的组合机制相结合的新型子集组合成新解的构解机制，同时采用动态更新参考集与临界准则策略来加快收敛速度。

Have been analysed by the water drainage performance on the road surface to draining off water of knowledge principle of the influent, draw the theory formula of drainage speed,draw and drain off water the impact on critical speed of infiltration coefficient on the road surface.

由渗流知识原理对排水路面的排水性能进行了分析，得出排水速度的理论公式，得出排水路面的渗水系数对临界车速的影响。

According to the real dynamic geologic feature of the volcanic gas reservoirs in Shengping developing zone of Xushen Gas Filed, the authors applied integrally the methods of gas reservoir engineering, gas-producing engineering, economic evaluation and gas reservoir numerical simulation to analyze and prove synthetically the economic boundaries such as entrained liquid threshold, single well location outcome boundary, economic ultimate distances between wells, rational gas- producing rate and so on for gas reservoir development technologies.

依据升平开发区火山岩气藏实际地质动态特征，综合应用气藏工程、采气工程、经济评价和气藏数值模拟等方法，对气井临界携液产量、单井布井产量界限、布井经济极限井距和气藏合理采气速度等气藏开发技术经济界限进行了系统的分析和论证。

The commonly-used capacity calculation approaches for ramp junctions are mostly based on the American HCM method, It had been approved that the headways for vehicles following the Weibull distribution function at on-ramp junctions in urban freeway system. The paper examined the critical headway and following time by the modified drew method and the survey traffic flow data on-site. The gap-acceptance capacity calculating model was developed for on-ramp junctions of urban freeway, and the numerical integration method was used to solving the model. Finally, the capacity values were obtained in condition of different mainline design speeds and different acceleration lane lengths.

针对目前国内外匝道连接段通行能力计算以美国HCM为主的现状和不足，研究发现城市快速路入口匝道连接段车头时距服从Weibull分布规律，利用改进的Drew方法及实际现场调查交通流数据确定了临界车头时距和随车时距，建立了城市快速路入口匝道连接段通行能力的间隙接受计算模型，并利用数值积分法进行计算和求解，从而得到了主线不同设计速度及不同加速车道长度条件下的城市快速路入口匝道连接段可能通行能力值。

At the beginning of rill development, velocity of the flow increases gradually, and when rills come basically into shape, it decreases and then levels off.

根据坡面特性，分析水流速度和泥沙含量之间关系使土壤侵蚀的临界坡度得到比较合理的解释。

The mathematical model of the ratio of radiuses difference to electro-negativity difference and the critical cooling rate Rc was established. The same relationships with a shape of upturned parabola in all five kinds of alloys were obtained with this model.

建立了原子半径差与电负性差之比Δd/Δe与临界冷却速度R的数值模型，并在所有五种不同合金系中获得一致且开口向上的抛物线关系。

The critical shear angle of quasi-static state was given under different loading speeds and frame lengths condition, and the influence of specimen size on this shear angle range is also discussed.

在此基础上，提出了在特定的剪切范围内，可以将画框的运动看作是准静态过程进行处理的思想；得出了在不同拉伸速度和边框长度条件下装置处于准静态时的临界剪切角，并且分析了织物试样尺寸大小对准静态范围的影响。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。