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According to the d'alembert principle, the piston moving characteristics must be identified firstly to analyze its reciprocating inertia force.

根据达朗伯原理，为分析作用在活塞上的往复惯性力，需要先确定活塞的运动特性。

Firstly,driving forces equations of each driving pair of the whole mechanism are established by combining D'Alembert Principle with virtual displacement Principle.

然后利用虚设机构法建立机构中各杆件的速度、加速度的一、二阶影响系数矩阵，从而解决了少自由度关联机构惯性力求解中各杆件的速度和加速度难以求解的问题。

The main research contents in this thesis include four aspects, which are described as follows: Firstly, we do research on TC technology, mainly focus on the DAA protocol supported by TC technology.

本文的研究内容主要包括以下四个方面：首先，对TC技术进行了研究，重点研究了TC技术所支持的DAA协议。

Firstly, the volcanics and shaly sand were separated with FMI static images and conventional logging data. Then, the image characteristics of all typical volcanics were analyzed with the dynamic FMI images to establish the FMI image patterns of volcanic lava (including rhyolite, dacite, andesite, and basalt) and volcaniclastic rock (including volcanic breeds and tuff).

首先利用FMI静态图像和常规测井曲线将砂泥岩与火山岩区分开来；然后利用FMI动态图像分析了火山岩各种岩性的图像特征，归纳总结出火山熔岩类（流纹岩、英安岩、安山岩、玄武岩）和火山碎屑岩类的FMI图像模式。

Firstly, a DAE version of extended LaSalle invariance principle is discussed.

为此论文研究了该方法在DAE形式下的推广。

Comparing with Daikon,the method has two excellent features.Firstly,it is better expansible based on the RDBMS technology;Secondly,discovering of program invariants can be accomplished by the function of SQL query based on the technology of relational database which can detect the program invariants in a nimble way.

该方法和Daikon等现有的程序不变量检测工具检测方法比较具有明显的特色和优势：第一，基于关系数据库技术，具有良好的可扩展性；第二，使用SQL条件查询功能实现非函数依赖程序不变量检测，检测方法具有很好的灵活性。

It shows in the test of simulation sample that the ratio of interference inhibition is higher than 5000, and the minimum detected discharge magnitude is 0.06pC. Again, a method of polarity discrimination and high interference inhibition for the dual-input and single-output damped oscillation signal is proposed firstly.

在脉冲鉴别法的基础上，通过详细分析脉冲鉴别的原理和双端输入、单端输出信号的极性，首次提出了对双端输入、单端输出衰减振荡的局部放电信号进行极性鉴别的方法和极大干扰信号抑制方法。

Firstly, this paper researched the mechanism of tubing string vibration when natural gas flows in horizontal well tubing string. Secondly, established whole tubing string undamped and damped vibration system model according as reasonable assumption data of one horizontal well. Apply finite element analysis software to calculate tubing string natural characters, simple harmonic dynamic behavior of stable gas production and nonlinear dynamic behavior. Finally, this paper carried out the safety varied frequency of gas well and the method of vibration reduction.

本文首先从理论和数值模拟研究了天然气在水平井油管柱内的流动诱发油管柱振动的机理，然后在合理假设的基础上结合某水平井数据建立了全井段油管柱无阻尼和有阻尼振动系统模型，利用有限元软件计算分析了油管柱固有特性、稳产简谐动力学响应和非线性动力学响应，针对油管柱振动规律提出了天然气安全调节频率范围和减振措施。

In October of same year, this opera was firstly played by Chinese Opera and Dance Drama Theater.

该歌剧所具有的不朽的艺术价值成为众多演唱者和音乐研究者关注的焦点。

Firstly , the Danelaw is defined.

第一，丹麦区的形成。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。