Based on the lab orthogonal tests, using self-manufactured constant head permeameter, the effect of gravel content, void ratio and particle shape on the coefficient of permeability of soil-rock-mixture was studied.
渗透同强度和变形特性一起，都是土力学中所研究的主要力学性质，在土木工程的各个领域中都有重要的作用[3]。
The relation between head and flow rate was predicted. The result indicate that the flux coefficient of the irrigation belt is 0.4858 that means the flow in the channel is turbulence, and can improve the anti-clogging of the emitter. The pressures of inlet and outlet of the emitter changed very little. The pressure dropped uniformity along the channel. The flow field can depart to two sections that were main stream near tooth tine and swirl near corner.
研究结果表明：该滴灌带灌水器的流量系数为0.4858，说明流道内为全紊流状态，有利于灌水器的消能，并可提高其抗堵塞性；灌水器进口及出口的压力变化很小，流道内沿水流前进方向压力均匀下降，流道单元相同时，压力变化幅度相同；流道内的流速可分为流道齿尖附近的主流区及齿脚附近的旋流区二个区，每二个单元之间的速度分布基本一致。
On this basis, by applying the method using varying water head the effect of infiltration path on water-air permeability coefficient is analyzed.
进而以变水头计算方法为基础，分析了增湿路径对水气渗透系数测定值的影响。
Variable-pitch inducers can be mounted in front of impeller inlet to improve the anti-cavitation properties of centrifugal pump. The inducer is designed with variable-pitch structure, with smaller inlet blade angle to obtain smaller import flow coefficient, and with greater outlet blade angle to generate enough head to meet the requirements of cavitation in the inducer and the inlet pressure performance in centrifugal impeller.
为了提高离心泵的抗汽蚀性能，在离心泵叶轮入口处配置变螺距诱导轮，诱导轮设计为变螺距结构，以较小的叶片入口角获得较小的进口流量系数，以较大的叶片出口角产生足够的扬程，满足诱导轮本身的汽蚀性能要求以及离心叶轮入口压力性能的要求。
Multiple class partial flow pump:(1)The head coefficient value should be low in the single class partial flow pump.(2)The total area of larynx wicket gate should be 200% the single classs larynx area.
2对于多级部分流泵：(1)部分流多级泵扬程系数的取值应比单级部分流泵的取值偏低一些；(2)部分流多级泵导叶总的喉部面积应是单级部分流泵喉部面积的两倍。
The results show that the choice of correlation model and the value of correlation distance and variation coefficient have an important impact on variance of hydraulic head.
结果表明，渗透系数相关函数模型的选取、相关距离和变异系数的取值对水头方差具有较大影响。
The head loss coefficient of down inlet linear transition is less than tortile transition and those above of outlet almost same.
设计流量下进口直线扭曲面型渐变段的水头损失系数小于反弯扭曲面型渐变段的水头损失系数，出口直线扭曲面型渐变段的水头损失系数与反弯扭曲面型渐变段的水头损失系数基本相同。
By coupling VOF method and standard k -ε turbulence model, the flow field of water-keeping weir is simulated and the local head loss coefficient of water-keeping weir is obtained; from which some design bases for the design of Tianjin section on the main channel of the South to North Water Transfer Project are provided.
其建筑形式是两端为有压箱涵，中间是一个有宽顶堰的井。保水堰两端为有压流，中间为井流或堰流，其作用是保证有压段管涵在任何情况下均处于有压状态，以避免气体进入有压管道。保水堰在南水北调天津干线中起着水位控制点的作用，其局部水头损失的大小直接影响调节池中水位的确定。
Based on the torque-equilibrium condition of vertical rolls, the equations of neutral angle were derived. The forward slip coefficient between the vertical roll with the base and head of rail were derived based on the law of constant rate of flow.
基于立辊的力矩平衡条件，推导出轨头、轨底变形区的中性角公式，并根据秒流量相等理论，推导出轨头和轨底相对于立辊的前滑系数公式。
The K coefficient of the connector for large-sized high strength hexagonal head bolts, the P force of the connector for torque-shear type high strength hexagonal head bolt, and the anti-slip coefficient of the frictional surface of high strength bolts are the crucial properties to be tested in evaluating steel structures for acceptance.
大六角头高强度螺栓连接副扭矩系数的检测，扭剪型高强度螺栓连接副坚固预拉力的检测，高强度螺栓连接磨擦面抗滑移系数的检测，是钢结构材料验收中的重要测量。
It is a key to obtain the optimal electing coefficient which decide the electing time of new cluster head.
本算法的关键是设置合理可行的选举系数，它决定着产生新一轮簇头的选举时间，即当簇头节点剩余能量低于设定值（选举系数与本轮簇头的初始能量之积）时，在簇内开始进行簇头选举；然后再通过比较各个节点的剩余能量，将具有最大剩余能量的节点选为新的簇头节点，这样就使节点的能量分布趋于均匀。
The slab head bending is related closely to the geometric shape coefficient of the deformation zone and entry angle.
实验结果表明，非对称变形是轧件头部翘曲的根本原因。
In order to determine hydraulic friction coefficient of polypropylene pipe, a high pressure water column diffuse gage was used to measure the friction loss head of a long straight PPR pipe at different flow rates.
为了测定聚丙烯塑料管的水力摩阻系数λ，用高压水柱压差计实测了PP-R直管段在不同稳态流量下的沿程水头损失，同时用电磁流量计测得相应的管道流量值。
However, cluster head is much more expensive. An unequal energy-balancing algorithm based on least-clustering was proposed in this paper, in which a least coverage model was established at first to optimize the cluster head number. On this basis, how to adjust the number of cluster member and aggregation coefficient to balance energy consumption was studied.
为此提出了一种非均匀的最少分簇能耗均衡算法，在该算法中，首先建立了一个最少覆盖模型，以优化簇头个数，并在此基础上研究如何通过调整簇内节点个数和融合相关度来均衡能耗，从而有效减轻热点问题。
By changing the parameters of the nozzle, the relationship between the impulse coupling coefficient and two dimensionless parameters, the ratio of the head diameter to the exit diameter of the nozzle and the ratio of the nozzle length to the exit diameter of the nozzle, was obtained.
通过改变喷管的构形，分析了圆锥形、圆台形喷管的冲量耦合系数与喷管顶部直径与出口直径之比以及喷管长度与出口直径之比之间的关系。
The optimum design example shows that the variation coefficient of load torque acting on cutting head is decreased 13.9%, and specific energy consumption is lowered 16.9%, which efficiently improves the load characteristic of cutting motor and increases the ratio of energy utilization.
优化设计实例表明，截割头的负载转矩变差系数减小了13.9%，截割比能耗降低了16.9%，有效改善了截割电机的负载特性，提高了能量利用率。
For instable operating conditions of diesel, calculated the boundary temperature and heat transfer coefficient using empirical formula and diesel engine indicator diagram which is the boundary conditions for calculating the piston head temperature field.
利用经验公式和柴油机示功图计算得出柴油机活塞稳定工况下的边界温度和换热系数，作为计算活塞头温度场的边界条件。
Advantages: good toughness, low friction coefficient of the ruby head, long life.
優點：有較好的韌性，寶石頭部摩擦係數低，具有超長的使用壽命。
Experimental Research of Discharge Coefficient of the Plat Gate in Small Opening at High Water Head
高水头闸室平板闸门小开度流量系数试验研究
Basing on this, the inner flow of stage from surging to blocking flows was calculated here. Then the charts of polytrophic efficiency and energy head coefficient of centrifugal compressor were presented.
在此基础上计算了从喘振到阻塞流量的全量程工况，给出了离心压缩机级的多变效率曲线和能量头系数曲线。