查询词典 principium

At first, this paper gives the brief introduction of the history and present status of accelerometer and its testing technology, the working principium and math model of the liquid floated pendu-lous accelerometer, and then, decides the binary width pulse force retrim loop as the design proposal of testing system, researches the transfer function of every part in the system emphasizly, analyses the stability of the whole accelerometer testing system from the angle of control theoretics by the open loop transfer function of system, and designed the correcting net, analyses the basal problems such as resolution, sampling restraint, precision and so on, designs the hardware testing circuits such as preamplification, band-pass filter, alternating amplifier, phase sensitive demodulatorn, pulse-width modulation, frequency scale circuit, moment current generator. Finally, using the graphics program language LabV-IEW which is designed for testing field especially by NI accomplishes the solfware design of testing system,realized the testing functions.

首先对加速度计及其测试技术的发展历史和现状，液浮摆式加速度计的工作原理和数学模型等作了简要的介绍，然后确定了以二元调宽脉冲再平衡测试回路为设计方案，并从控制理论的角度进行了分析，着重研究了系统中各部分的传递函数，利用系统开环传递函数分析了系统的稳定性，同时设计了系统的校正网络；分析了二元调宽脉冲再平衡测试回路的分辨率、采样约束以及测试精度等基本问题，并按照系统分析的结果设计了包括前置放大、带通滤波、交流放大、相敏解调、脉宽调制、频标电路以及力矩电流发生器等测试系统各部分硬件电路，验证了电路的正确性，最后按照测试系统的要求，采用了美国NI公司专为测试领域所开发的虚拟仪器工具——LabVIEW作为测试软件开发工具，利用该图形化编程语言完成了测试系统软件部分的设计，实现了测试功能。

Based on the prevention and cure principium of extract for Cr,the amphoteric modification was carried out to the waxberry extract through the treatments of sulphonation and Mannich reaction.

以栲胶对六价铬的防治原理为基础，通过磺化以及Mannich反应对杨梅栲胶进行两性改性。

The article introduces some needed resolving problems. It brings forward principium of control, How can drive the servo signal and X and Z to the coordination of movements; How to change the feed rate; design of system structure, confirmation for input and output point, I / O address allocation;and also the project for speedup/down control during the screwthread processing. Method of programming design and manual operation trapeziform figure in system of numerical control lathe Corresponding project to problems is provided synchronously.

介绍可编程控制器应用于车床数控系统需要解决的问题，如何产生驱动伺服机构的信号及X、Z向的动作的协调；如何改变进给速度等；提出PLC作为数控机床主控制器的控制原理；系统结构设计；输入/输出点数确定及输入/输出点的地址分配；螺纹加工中升、降速的解决方案；程序设计及具体操作梯形图设计的方法，并给出相应的解决方案。

Principium and characteristics of MD spray drier were introduced probable conks were summarized and also corresponding remedial measures were put forward .

介绍了MD型喷雾干燥机的原理和特点，对其生产过程中可能出现的问题进行了分析，并提出相应的补救措施。

The function and principium between improver of dough and quick-freezing baked food are introduced in this article.

该文分析冷冻焙烤食品在制作和冷藏过程中存在问题；详细论述面团强化剂与速冻焙烤食品相互作用原理；并探讨面团强化剂对冷冻食品品质特性影响。

Base on that, the paper introduced a new type principium of oil drain pump, and expounded the specialty of the oil drain pump and processed analysis and calculations corresponding to its working.

在此基础上介绍了一种新型机构原理的排油泵，阐述了该类排油泵的特点，并对其工作情况进行了相应的分析和计算。

In this thesis,I take out oil pole as object to research the principium and the method which base on the DSP to detect the magnetic flux leakage on-line in the first place.

本文以抽油杆为对象，研究了基于DSP的抽油杆在线漏磁无损检测技术的原理和方法，并提出了总体的设计方案和解决方法。

To the unclearly block that has not completely cut away from the rock masses by joints, the failure principium and stability estimation method are discussed.

对未完全与岩体脱离的块体，即不完全块体的破坏机理和稳定性评价方法进行了探讨。

And this paper introduced the principium, design ideal and approach of waveform presetting of waveform controlling at will The function of relevant hardware circuit controlling was design in this paper uses litter content RLC surge circuit in simulating the current signal of energy storage welding, and took it as Ug to control the inverter cap energy storage spot welding machine. It realized HFPEC resistance spot welding with hardware circuit and got the effect as good as the system controlled by industrial computer and realized the customization and the low cost of welding machine.

本文所设计的相应硬件控制功能，采用小容量RLC 放电回路来模拟输出储能焊过程的电流波形，由此作为电流给定信号直接控制逆变式电容储能点焊电源，实现了完全由硬件电路构成的高频脉冲电阻点焊，能够获得焊接设备的专用化和低成本化的结果，并且可以得到与工控机控制系统相当的焊接效果。

Six years later, John Roebuck in England adapted principium of nitroso process to build up a 6ft (1.89m) square lead-line chamber and carried out nitroso process reaction inside.

经过6年后，按亚硝基法原理，英国人丁·罗巴克在伯明翰建成一座6ft(1.89m)见方的铅室，在铅室内进行上述亚硝基制酸反应，成为世界上最早的铅室法制酸工厂。

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。