A comparison study of the composition of celery seed essential oil prepared by steam distillation ( SD) and supercritical fluid extraction with carbon dioxide ( SFE-CO2) was made using GC and GC-MS.

Analysis of fatty acid in two kinds of celery seed oil by GC/ MS

两种不同的芹菜籽油中脂肪酸的GC/MS分析

The celery seed oil was extracted with Soxhlet extraction method. The obtained seed oil was esterified by sodium hydroxide methanol, and then the components and their relative contents were analyzed by GC/ MS.

采用索氏提取法提取了天津实心芹菜籽油及美国西芹籽油，提取的油用氢氧化钾-甲醇法酯化后，对其进行了GC/MS分析。

An aluminum gate 100-element CCD analog delay line has been fabricated using a lift-off technique employing an auxiliary poly-Si layer.

本文提出一种以多晶硅为辅助层的剥离技术，运用该技术已研制成功铝栅100位CCD模拟延迟线。

Series in/ Parallel Out CCD Multi-Tapped Delay Line with a Tap Interval of N-Bit

隔N位一抽头的串入并出CCD多抽头延迟线

An Aluminum Gate 100-Element CCD Analog Delay Line Fabricated by Use of Lift-off Technic

采用剥离技术的铝栅100位CCD模拟延迟线

In order to improve the transfer efficiency, CCD shift register is designed with buried channel CCD. Reducing the impurity concentration in the buried channel is found to be an effective method of improving the transfer efficiency at the liquid nitrogen operating temperature ( 77K).

为了提高转移效率，CCD移位寄存器采用埋沟CCD，并且发现，降低埋沟中的杂质浓度是提高器件在77K液氮工作温度下的转移效率的一种有效方法。

Filled conduit is adopted as an example to analyze the finite elements of its structure by ANSYS program. Design of Operation Mode of Buried Channel CCD

以带有刚性基础的沟埋式管道为例，介绍了利用ANSYS软件进行管道结构有限元分析的基本过程。埋沟CCD器件工作状态的设计

Design of Operation Mode of Buried Channel CCD

埋沟CCD器件工作状态的设计

The actual operation shows that the equipment cavitation is very serious by the method of setting cavitation coefficient in many cases.

实际运行表明在很多情况按该方法设定空化余量的水力机械设备空蚀情况非常严重。

Cavitation Monitoring System Based on Surface of Critical Cavitation Coefficient

基于临界空化曲面的空化监测系统设计

However, for bulb turbine, the discharge is large, the number of runner blades is less, the total area is small, cavitation coefficient is large, Intensity condition is bad, as a result, the application head is limited.

但由于贯流式水轮机转轮叶片数少，叶片总面积少，而过流量又较大，气蚀系数大，且叶片强度条件差，故其适用水头是有限的。

In this paper, from Bernoulli's equation of silt-laden water flow, the formulae of cavitation coefficient and static draft head of a hydraulic turbine in silt-laden water flow are ascertained theoretically.

本文以含沙水流时的伯努利方程为依据，从理论上推导了含沙水流时水轮机的汽蚀系数与吸出高度计算公式；

Moreover, the cavitation coefficient that can describe the strength of cavitation is definitude. It has a good consistency with the theoretical maximum sound pressure.

此外，定义了描述空化强弱的空化系数K，并将其与通过理论计算所得的空泡振动最大声压进行比较后发现两者有着较好的一致性。

This paper presents the major parameters of hydraulic turbines one by one, such as rated head, specific rotating speed and specific speed coefficients, unit flow, unit speed, cavitation coefficient, efficiency, stability etc.

对构皮滩水电站水轮机的额定水头、比转速及比速系数、单位流量、单位转速、空化系数、效率、稳定性等逐一进行论述，介绍了基本参数和参数水平。

Accurate confirmation of hydro-turbine output with critical cavitation coefficient

利用临界空化系数精确确定水轮机出力

Drag coefficient Cd as a function of cavitation number;

阻力系数随空泡数的变化规律；

With the decrease of cavitation number, the loss increase further.

且随着空化系数的降低，损失增加。

Determination of Fluid Cavity Separation in Pump System by Cavitation Number

用空化数判定泵系统流体的空化断流

To study the cavitation mechanics and its relation-ship with noise characteristics of the valve-port high-speed flow, high-speed photography and noise spectrum analysis are applied to investigate the flow area and the related phenomenon inside the throttling area of valves.

为研究阀口高速流动中的旋涡空化机理及其与噪声特性的关系，运用高速摄像、噪声频谱分析等手段对典型阀口孔隙节流处的流场及流动现象进行分析。

Exploration of the pump Energy Test and Cavitation Test and Cavitation Test Curve-fitting

水泵能量试验及汽蚀试验曲线拟合的探讨