器

Such as: calibrating the laser system, calibrating the measurement region and focusing the CCD camera for the diffuser passage with complex shape, selecting the best incidence angle for the laser sheet,, setting the time parameter including the time between pulses and the time between records, designing the laser system, and selecting water fog with 1～5μm diameter as seedings for PIV measurement after comparing several particles. All of the work is useful to accumulate the PIV measurement experience in turbomachinery. 2. Experimental research of the unsteady flow in diffusers The instantaneous velocity fields within the vaneless and vaned diffuser were measured by using PIV technique.

本文在国内首次进行PIV测量系统对离心风机扩压器内部非定常流动的测量，为此，作者作了必要的实验前期工作：双谐振激光器工作特性的标定；针对扩压器复杂的流道形状，解决了片光源照射区域位置的标定和CCD相机的聚焦等问题；为复杂流道形状的扩压器内部流动的PIV测量选择了最佳片光源入射角度；选择了合适的PIV测量时间参数；为实现非定常内流的PIV测量设计了PIV系统的光路布置；根据非接触测量示踪粒子的选取原则，对几种示踪粒子进行了筛选，最终1～5μm的水雾粒子在本文实验条件下获得最佳效果。

A new method of a centrifugal compressor with a hub airfoil-vane diffuser was proposed and applied based on the investigation of a centrifugal compressor with vaneless diffuser.

0前言扩压器是离心式压缩机一个级的重要组成元件之一，主要分为有叶扩压器和无叶扩压器两种。

In the vaneless diffuser, which was little bigger than that of vaneless diffuser. The reason was the intervention of vane enhanced the unsteady degree of the flow and expanded the unsteady effect region.

叶轮对有叶扩压器内部非定常流动的影响也没有维持到有叶扩压器的出口，非定常影响区域为大约在半径r/r〓=1.3以内的区域范围，略大于无叶扩压器内的非定常影响区域。

The new compens ator consists of a three-phase voltage source inverters(to eliminat e negative sequence current and adjust reactive power)and a single-phase voltage source inverters(to eliminate zero seq uence current).

该补 偿器由用于补偿负序分量并调整负荷母线电压的三相电压型逆变器和用于补偿零序分量的单相逆变器组成。

The APIC's timer counter is 32 bits long, while the PIT's timer counter is 16 bits long; therefore, the local timer can be programmed to issue interrupts at very low frequencies (the counter stores the number of ticks that must elapse before the interrupt is issued).

APIC的定时器计数器是32位，而PIC的定时器计数器是16位；因此，可以对本地定时器编程来产生很低频率的中断计数器存放中断发生前必须经过的节拍数

Our product line includes digital television receivers (Terrestrial, Cable, Satellite, MMDS), digital headend equipments (Professional Satellite Receiver, Encoder, Multiplexer, Scrambler, Modulator), and software and solutions (Conditional Access System, Subscriber Management System, Electronic Program Guide).

我们的产品主要包括数字机顶盒(地面/有线/卫星/ MMDS )，数字电视前端设备(专业卫星接收机/编码器/复用器/加扰机/调制器)，以及软件和方案(条件接收系统/用户管理系统/电子节目指南)。

Our product line includes digital television receivers (Terrestrial, Cable, Satellite, MMDS, IPTV), digital headend equipments (Professional Satellite Receiver, Encoder, Multiplexer, Scrambler, Modulator), and software and solutions (Conditional Access System, Subscriber Management System, Electronic Program Guide).

我们的产品主要包括数字机顶盒(地面/有线/卫星/ MMDS /IP 机顶盒)，数字电视前端设备(专业卫星接收机/编码器/复用器/加扰机/调制器)，以及软件和方案(条件接受系统/用户管理系统/电子节目指南)。

Our product line includes digital television receivers (Terrestrial, Cable, Satellite, MMDS, IPTV), digital headend equipments (Professional Satellite Receiver, Encoder, Multiplexer, Scrambler, Modulator), and software and solutions (Conditional Access System, Subscriber Management System, Electronic Program Guide).

我们的产品主要包括数字机顶盒(地面/有线/卫星/ MMDS /IP 机顶盒)，数字电视前端设备(专业卫星接受机/编码器/复用器/加扰机/调制器)，以及软件和方案(有条件接受系统/用户管理系统/电子节目指南)。

Our product line includes digital television receivers (Terrestrial, Cable, Satellite, MMDS, IPTV), digital headend equipments (Professional Satellite Receiver, Encoder, Multiplexer, Scrambler, Modulator), and software and solutions (Conditional Access System, Subscriber Management System, Electronic Program Guide).

我们的产品主要包括数字机顶盒(地面/有线/卫星/ MMDS /IP 机顶盒)，数字电视前端设备(专业卫星接受机/编码器/复用器/加扰机/调制器)，以及软件和方案(条件接受系统/用户管理系统/电子节目指南)。

The NSP Power model the NTC thermistor is a kind of semiconductor ceramic element that mostly made from transition metal OXID material, and belongs to negative temperature themistors. It has a rated resistance.

NSP功率型NTC热敏电阻器是以过渡金属氧化物为主要原料制造的半导体陶瓷元件，属於负温度系数热敏电阻器范畴，功率型NTC热敏电阻器有一个额定的零功率电阻值

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。