The key items include the car sinking , constant speed characteristics , inspection function , auto relevelling function and level accuracy , etc . the research contents focus on the following three parts : firstly , research on effects of system parameters on car sinking has been completed . secondly , the constant speed performance with the compensation of internal leakage of pump / motor is improved . lastly , research on improvement of the car level accuracy and contrast to that of traction elevators is presented , and the reasons of low car level accuracy of hydraulic elevators are discussed 重点研究了三方面内容：一是研究了停层沉降特性及影响电梯轿厢停层沉降特性的各种因素；其次是通过负载压力补偿液压泵马达内泄漏来改善电梯轿厢速度稳定性；最后是液压电梯平层精度的理论和实验研究，并与曳引电梯的理论模型进行了对比，阐述了液压电梯平层精度低的原因，理论探讨了影响液压电梯平层精度的主要因素。
Abstract : this paper introduces the principles of doppler radar signal processing method in the modulation . it provides the processing method for projectile tracer time , the burst time , rocket engine working time , projectile spin and flight attitude from signal of doppler radar 文摘:介绍了测速雷达调制域弹道信息处理方法的工作原理，详细论述了从测速雷达信号中处理弹丸曳光时间、底排燃烧工作时间、火箭发动机工作时间、弹丸旋转速度、飞行姿态角和摆动周期等弹道信息的方法。
He even roused himself to go to the mines once more : and when he was there , he went down in a tub , and in a tub he was hauled out into the workings . things he had learned before the war , and seemed utterly to have forgotten , now came back to him . he sat there , crippled , in a tub , with the underground manager showing him the seam with a powerful torch 他坐在一个大拥里，被人牵曳着到各得的矿洞，大战前他所尽知而似乎完全忘记了的许我事情，现在都重新显现在他目前了他现在是残废了，端从而在那大桶里，经理用着强有力的灯光，照着矿脉给他看。
The results show that , comparing with the gas pressure drops calculated by the modified ergun equation , in the cases of the gas reynolds number is small , due to the presence of the dead space , the observed p in the experiments are bigger than that obtained by calculation , and when the gas reynolds number is large , because of the small interfacial viscous drag - force between gas and liquid , the p observed are smaller than that obtained by calculation 结果表明在气相雷诺数较小时，由于停滞孔隙率的存在，实测压降值比修正厄根方程计算的值大；气相雷诺数较大时，气液界面上产生的粘性曳力较小，实测压降值比修正厄根方程计算的值小。
Firstly , based on the present research all over the world , a 3d quasi - single phase model is built together with k - equations . the special feature of this model is taking account of the influence of interaction between liquid and gas , that is to say , the influence of interphase drag force , lifting force perpendicular to the relative velocity , virtual mass force and gas or liquid volume fraction in the fluid field have been considered . a 3d two - fluid model is also built in order to describe more accurately the fluid flow on distillation trays by comparing the computational results of quasi - single phase mathematical model with of two - fluid mathematical model 本文在国内外已有的研究基础上，首先建立了以k - (封闭模型为基础的三维拟单相流模型，该模型的特点在于充分考虑了气液两相间相互作用的影响，即计入了相间曳力、横向升力、虚拟质量力和气、液相含率对流场的影响；并建立了塔板三维双流体模型，主要目的是通过对比拟单相流数学模型、双流体数学模型的计算结果，建立能够准确描述塔板上流体流动的数学模型。
According to dynamical characteristic of the bubble motion in the flow field , and under the assumptions of isothermal system without interior heat source , uniform bubble size , and ignoring surface tension , the mathematical expressions for interfacial momentum exchanges have been deduced which include drag , virtual mass force , and lift 针对气液泡状流中气泡运动力学特性，在系统绝热、无内热源、忽略表面张力、气泡尺寸均一前提下建立了气液相间曳力、虚质量力、升力的数学模型表达式。
N the fall of 1994 , before ever hearing about supreme master ching hai , i had an unusual and auspicious dream about a beautiful and powerful woman . she was dressed in royal golden robes from some oriental land . her clothes were magnificent , with long , tapering lapels that touched the ground , and a circular gold headpiece or crown that surrounded her head like a halo 年秋天，那时还从未听说过清海无上师之前，我做了一个不寻常梦兆，梦见一位又美丽又有力量的女士，身穿某一东方国度的金色皇家服饰，上窄下宽的襟袍长长曳地，非常华美，头戴圆形金色头冠，很像光环，在一个宝座台上被高高托起。
