Decreasing billet casting friction drag and lowering heat transfer at initial solidification point to advance the surface quality of billet.
降低拉坯阻力和减弱初始凝固点的传热来提高铸坯表面质量。
The results show that the increase of surface friction drag and deformation temperature can effectively accelerate the densification.
结果表明，增大试样表面的摩擦阻力，并适当提高变形温度可有效促进致密化过程。
Although in many physical models we ignore the air friction, it does present. Empirical result shows the air friction acting on an object is, where Cd is the drag coefficient, ρ is the density of air, A is the area of object facing motion and v is the speed.
在很多物理模形中，我们都忽略空气阻力，可是，它确是存在的，而根据实验数据，空气阻力为，其中Cd是「阻力常数」、ρ是空气密度、A是物体面向运动的表面积、v是速率。
In order to improve the accuracy of the existing transformation ratio model of the hydraulic transformer, a mathematical model is established by introducing the friction coefficient, the viscous drag friction coefficient and the laminar leakage coefficient.
为解决已有的液压变压器变压比模型与实际结果偏差较大的问题，通过对实际工作过程中不应忽略的摩擦与泄漏损失进行研究，引入机械摩擦损失系数、黏性摩擦损失系数和层流泄漏系数，建立了液压变压器变压比模型。
Drag reduction agent in oil fluids can improve flow quantity greatly and minish friction in a fully developed turbulent channel flow by the addition of small amounts of certain polymers.
油溶性减阻剂为一种原油和成品油管道运输添加剂，当在高度湍流的管道中添加wPPm级的减阻剂，即可起到减小摩阻提高流量的作用。
The specific method is: first host of the brake rod to remove the trailer brakes to adjust the various parts, when the trailer brakes until the wheels with the ground so far appeared prints hysteresis drag, and then host the brake rod lever arm with pedal connections, and adjust the brake connecting rod connecting the host length, until the brake unit, all wheels have friction with the ground traces of the adjustment shall be qualified.
具体方法是：先把主机的制动连杆摘掉，对挂车制动装置的各个部位进行调整，直至刹车时挂车的车轮与地面出现拖滞印痕为止，然后再把主机的制动连杆与踏板的杠杆臂连接好，调整主机制动连杆的连接长度，直到机组刹车时，所有的车轮与地面有摩擦痕迹，即为调整合格。
The principle and method of pipe flow calculation using friction drag of a straight pipe are introduced.
工业过程中进行流量测量的方法很多，所涉及到的流量传感器也较多。
The stainless steel plate of the movable support and the Teflon board use the silicon grease lubrication, which may reduce the friction drag.
、活动支座不锈钢板和聚四氟乙烯板采用硅脂润滑，可降低摩擦阻力。
That never changes if there is no air drag or air friction of any kind.
它未曾变过，如果没有空气阻力，或任何摩擦力。
The influence of air friction drag upon the measurement of gravity acceleration measurement on air-cushioned guide way
气垫导轨测重力加速度时空气粘滞阻力的影响
This only holds if there is no air drag, no friction of any kind.
如果没有空气阻力，没有任何摩擦。
The skin-friction drag can be reduced significantly by changing the amplitude and the period of the spanwise wall oscillation.
通过改变振幅大小和振动周期，可以使壁面摩擦阻力明显减少。
It enables the boat to float on the water surface, which reduces the direct contact area between the solid surface and water. Therefore, the friction drag force between the water and boat bottom can be decreased.
这种结构可以使小船漂浮在水上，减少了水与固体的直接接触面积，降低船底与水流的摩擦阻力。
Study on Frictional Torque & Drag Reduction While Drilling The equations for calculating the bearing force, the leakage rate and the frictional torque of the fluid film were also derived. Friction and frictional torque are main restriction factors for horizontal displacement of long reach well.
摩阻和摩扭是限制大位移井水平位移的关键问题，优选造斜段曲线可以减小摩阻和摩扭。
This design of center simple chain of the scraper conveyer characteristic includes: the structure is simple, the stress is even, moves steadily, the friction drag is small, the chute use factor high, the curving performance is good, It is not easy to appear stops up, has the very strong compatibility.
此次设计的中单链型刮板输送机的特点是结构简单，受力均匀，运行平稳，摩擦阻力小，溜槽利用率高，弯曲性能好，不易出现堵塞，具有很强的适应性。
Considering the engineering of trail pile in Hubei Jingzhou Yangtze River Highway bridge, the construction process of deep cast-in-place pile under pebble geological structure, the limit load-bearing capacity of single pile, side friction stress and head drag are researched in this thesis deeply.
论文结合湖北省荆州长江公路大桥的试验桩工程，深入研究了江汉平原地区卵石地基深钻孔灌注桩的施工工艺、单桩极限承载能力、桩侧摩阻力和端阻力。
The drag reduction percentage for these micelles increased with the increase of Generalized Reynolds number (ReM). The relationship between Fanning friction factor and generalized Reynolds number was obtained.
胶束体系减阻率随广义雷诺数ReM的增大而增大；并获得了摩擦阻力系数与广义雷诺数ReM的变化关系。
The test data expresses the stake side friction resistance to rises with a bat batch terminal friction resistance very important function, the of tip of pile resistance drag occupies the proportion very few.
试验数据表明桩侧摩阻和支盘端阻起很重要的作用，桩端阻力所占比例甚少。
Dynamic Characteristics on Friction Drag Reduction for Fluid Transport Using Flexible Tubes
柔性管流体输送紊流减阻的力学特征
Drag reducer is a kind of chemicals consisted in high molecular polymer, which can reduce the friction-al drag for the liquid flowing within pipe.
减阻剂是一种高分子聚合物的化学制品，能减少液体在管道内流动的摩阻。