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The influences of relevant parameters such as mass velocity, heat flux, pressure, inlet subcooling, and compressible volume on the threshold, period and amplitude of oscillation were studied.

分别研究了压力降脉动和密度波脉动的特征、脉动机理及其有关参数，如质量流速、系统压力、过冷度、可压缩容积、热负荷等参数对脉动界限值、周期和振幅的影响。

Comparison between the velocity distributions at the different flow rate conditions showed that increasing the flow rate was help to improving the velocity distribution. The periodic mean field on r-6 plane at different axis positions showed that the flow within the vaned diffuser, especially within the inlet region, was periodic unsteady when impeller located at the different circumferential position, just as the flow within the vaneless diffuser.

有叶扩压器内平均流场的分析表明，在定常流动的假设下，不同流量工况下有叶扩压器的内部流动也呈现为沿轴线向后盘方向推移流动状况逐渐恶劣的分布规律，表明二元叶片构成的平行直壁有叶扩压器对轴向不均匀流动的掺混作用仍然不大。

The invention provides a system used for recycling urban automobile-washing water, which is a system formed by organic combination of a pretreatment unit, a mechanical treatment unit and a control unit, wherein, the pretreatment unit comprises a fence and a sedimentation tank, and chemical treatment; the fence is arranged on an inlet of the sedimentation tank; the mechanical treatment unit adopts a centrifuge and is arranged on an outlet of the sedimentation tank; and the control unit comprises a peripheral circuit, a singlechip and a variable-frequency motor.

本发明提供的城市洗车用水循环利用系统，是由预处理、机械处理和控制单元的有机组合来的系统，其中：预处理单元包括栅栏以及沉淀池和化学处理，栅栏设置在沉淀池的入口处；机械处理单元采用离心机，它设置在沉淀池的出口处；控制单元包括外围电路、单片机和变频电机。

The accuracy of the MFC was 3.8%FS, and the Rotor Flow Meter's was 2%FS. 2. The measurement of pressure was carried out by using semiconductor silicon piezometer. With the static pressure in inlet of pipeline and theoretic analysis we could get the total pressure of MPT.

3可在真空下稳定工作的新型微波源功率的测量较为方便，通过改变控制电压的大小可以调节输出功率，通过测量衰减检波器的输出电压信号可实现反射功率的测量。

The driver consists of magnetostrictive rod, front magnetic pole end cap, back magnetic pole end cap, exciting winding, micro displacement output head, casing, fixed end cap, front end cap, spring, winding tap, flat spiral pipe, water inlet pipe and water outlet pipe. The water cooler of the present invention is formed through inserting one end of some metal pipe into positioning hole of spindle, installing rolling tool onto tool carrier, adjusting the lathe to the pitch of the flat spiral pipe and starting the lathe to complete the extruding formation of the flat spiral pipe.

本发明的驱动器包括有磁致伸缩棒(7)，前磁极端盖(3)，后磁极端盖(10)，励磁线圈(5)，微位移输出头(1)，壳体(12)，固定端盖(9)、前端盖(2)，弹簧(13)，及线圈抽头(11)，螺旋扁管(6)，入水管(8)和出水管(4)；本发明的水冷装置的成型方法为把金属圆管的一端插入芯轴(18)的定位孔(23)中，将滚压工具(20)安装在刀架上，调整车床的加工螺距与螺旋扁管(6)的螺距相等，启动车床，完成整个螺旋扁管的挤压成型。

For the sake of enhancing the efficiency of gas inlet and outlet, the mathematical model that takes the plentitude coefficient as the target function may be established. In addition, based on the working characteristics of cam mechanism, the surface wear is its main failure mode; the second target function can be accordingly established.

为获得高的进排气效率，可建立以丰满系数为目标函数的数学模型；另外，基于凸轮机构的工作特点，表面磨损是它的主要失效形式，可依此建立第二目标函数。

The experimental results indicated that these metal oxide catalysts had better catalytic activities to the methylene chloride gas at low concentration, and the catalytic activities increased with the increase of temperature,but decreased with the increase of inlet gas concentration. The CrO3/potsherd catalytic activity was better than V2O5/potsherd, and the CrO3/potsherd catalyst displayed higher activity at the relative low temperature. When the reaction temperature was 320 ℃, the conversion rate could reach 99%, and the result of 100h catalyst stability experiment show that the catalytic activities have good stability.

实验结果表明此类金属氧化物催化剂对低浓度CH2Cl2气体有较好的催化活性，催化剂的活性随温度升高而升高，随入口废气浓度增大而降低，其中CrO3/陶瓷片催化剂的催化活性比V2O5/陶瓷片催化剂的活性好，CrO3/陶瓷片催化剂在较低温度下就表现出较高反应活性，在反应温度320℃时，转化率即达到99%，同时催化剂100h稳定性实验结果表明催化剂活性有很好稳定性，为进一步工业化应用提供理论和实践依据。

Be in early 60 time is prime, ministry of national aquatic product comes another name for Jiangxi Province makes an on-the-spot investigation, an inlet place that is admired by this wave smooth Lian is attracted, it is this certainly " south carries out fresh water to breed pilot base ","Lake of state-operated green haze aquiculture test site " from this and renown.

早在60年代初期，国家水产部来赣考察，一眼就被这片波光潋艳的水湾所吸引，将此确定为"南方推行淡水养殖试点基地"，"国营青岚湖水产养殖试验场"由此而名。

In this paper, the theory of waterjet propulsion system and the characteristic of waterjet propulsion technology has been researched. Apply Genetic Algorithm and CFD technology, in this paper,to calculate the main parameter of WPC96s waterjet propulsor and simulate the flow of the water in waterjet inlet.

本文以大型穿浪双体船WPC96为研究对象，系统地论述了喷水推进系统的基本结构和理论，研究了穿浪双体船喷水推进系统主要参数的优化，并对喷水推进船舶的推进效率进行了系统理论阐述。

Apply Genetic Algorithm and CFD technology, in this paper,to calculate the main parameter of WPC96's waterjet propulsor and simulate the flow of the water in waterjet inlet.In addition,analyze the factors that can affect waterjet system efficiency, such as K ,mostly geometry parameters,IVR.

在此基础上运用MATLAB遗传算法和CFD软件——FLUENT对喷水推进器主要参数优化计算以及进水管流场数值模拟进行了研究，并针对影响喷水推进器进水管系统效率的主要参数(如进水速比IVR、喷速比等)进行了分析。

Researches reveal that students who suffer from corporal punishment tend to resort to violence in their future life.

研究表明遭受过肉体惩罚的孩子倾向于在他们今后的人生中使用暴力。

Total sugar of sarcocarp and chlorophyll of pericarp increased firstly, and then decreased afterward along with altitude; Titratable acidity, ascorbicacid and anthocyanin of pericarp were increased along with altitude; The content of protein increased firstly and decreased afterward along with altitude; Carotenoid of pericarp were decreased along with altitude.

果肉总糖和果皮叶绿素含量随海拔高度升高先升高后降低；可滴定酸、维生素C和果皮花青苷含量均随海拔升高而升高；蛋白质在1720m处最大，1420m处最小；果皮类胡萝卜素随海拔升高而降低。