比较原理

We analyzed the electro-hydraulic proportional variable displacement piston pump from three aspects of its structure,control principle and mathematical model,and compared the main characteristics of an open-loop controlled pump with a closed-loop controlled pump.

从结构、控制原理和数学模型等3个方面对开环和闭环电液比例变量柱塞泵进行分析，比较二者的主要性能特点。

The basic content and calculational principle of bevel gear blank is introduced in Chapter 3, and a new method is presented to calculate the pitch cone parameters.

在第3章中，介绍了齿坯设计的基本内容和计算原理，并提出了一种节锥面参数计算新方法，论文详细论述了新方法的基本思想和实现步骤，并与其它方法进行了比较，最后给出了计算实例。

The aim of this paper was to investigate the sensitivity of steppe polecats to starvation risk by comparing their selection to constant and variable food patches under different starvation conditions through the two-choice test in the laboratory.

在室内条件下，通过双通道选择实验比较艾虎在不同饥饿条件下对固定食物量斑块和变化食物量斑块的利用程度，确定艾虎对食物变化量的敏感性，以验证风险敏感取食原理。

Our mill adopts medium speed and pressure, and repeated planishing principle, and its design is reasonable. The materials fall down by gravity. The materials are high strength and hardworking, while all the parts of rollers and ring will be worn evenly and capacity is compared evenly too.

STM立磨采用了中速中压反复碾压的原理，合理设计，物料自上而下自由落入，粉磨高硬度、难加工材料时磨辊磨环上、中、下部获得同等程度磨损，产量比较均匀。

Compared to atmospheric pressure hot water boiler, operational principle and characteristic of vacuum hot water boiler are narrated.

叙述了真空热水锅炉的工作原理、特点以及与常压热水锅炉的性能比较。

This paper has discussed the heat stableness of the basic metal nitrides by thermodynamic principles,and compared the results with the facts of the experiments.

利用热力学原理对碱金属氮化物热稳定性规律进行了探讨，与实验事实比较，得到了满意的结

The math model of the movement,flux and control system of position pump was established by analyzing its working principle,and its hydraulic system simulation model was established based on AMESim.The pressure and flux pulsation of the position pump was analyzed,and the pressure and flux was calculated by simulation when there are sign of wear for the position pump and system flux change.

分析了恒压力轴向柱塞泵的工作原理，推导并建立了液压泵压力流量和压力调节机构的数学模型，并在此基础上以AMESim工程软件为平台建立了轴向柱塞泵的仿真模型，分析了压力流量脉动状况并对液压泵在内部磨损和系统流量变化两种情况下的压力流量进行了仿真计算，对两种情况下泵的工作情况进行分析比较，为液压脉动抑制和故障分析提供了参考。

Engineering College, Air Force Engineering University, Xi'an Shaanxi 710038, ChinaAbstract: The math model of the movement, flux and control system of position pump was established by analyzing its working principle, and its hydraulic system simulation model was established based on AMESim. The pressure and flux pulsation of the position pump was analyzed, and the pressure and flux was calculated by simulation when there are sign of wear for the position pump and system flux change.

分析了恒压力轴向柱塞泵的工作原理，推导并建立了液压泵压力流量和压力调节机构的数学模型，并在此基础上以AMESim工程软件为平台建立了轴向柱塞泵的仿真模型，分析了压力流量脉动状况并对液压泵在内部磨损和系统流量变化两种情况下的压力流量进行了仿真计算，对两种情况下泵的工作情况进行分析比较，为液压脉动抑制和故障分析提供了参考。

Secondly this paper analyzes the research present conditions and development trend of transmitter and miniature wireless in missile at home and abroad thoroughly ,then designs the PCM-CDMA-QPSK system of integrated miniature wireless beacon which based on the technology of CDMA and DUC.

其次，在深入分析和比较国内外弹载发射设备和无线信标技术研究现状的基础上，针对多目标测量的需求，基于码分多址和直接上变频技术原理，设计了PCM-CDMA-QPSK体制的微小型无线信标系统总体，完成了无线信标系统中基带扩频电路的调试，结果表明，基于码分多址的多信标测量方法是可行性，所设计的系统可靠有效。

The measure principles and optical paths of multi-line spectrum analysis,multi-channel radiation pyrometer,and laser speckle photography were introduced.

综述了几种电弧等离子体温度场的诊断技术，阐述了光谱多线解析法、多通道辐射高温计法、散斑照相法的测量原理和光路设计，分析比较了光谱多线解析法、多通道辐射高温计法、散斑照相法等方法的优缺点。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。