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On the basic of it chatter of cutting processes is analyzed by speed feedback and displacement delaying feedback and curial condition of stability cutting is discussed. Secondly, dynamic model of deep-hole drilling system with the two degrees of freedom are established in the light of principles of machining chatter in cutting processes.

本文针对深孔加工系统的特点,首先分析了深孔加工的力学特性,并在此基础上,根据金属切削中的颤振现象,对金属切削过程中由于速度反馈和位移延时反馈所引起的颤振现象进行了分析,并分别讨论了稳定切削的临界条件。

Actually ,signals are processed from low frequency domain to high one by modulation firstly and alternating current amplification secondly.It can also improve anti-interference抗干扰 ability of circuit and signal to noise ratio of signals.

实际中往往采用更有效的先调制而后交流放大,将信号从低频区推移到高频区,也可以提高电路的抗干扰能力和信实际中往往采用更有效的先调制而后交流放大,将信号从低频区推移到高频区,号的信噪比。

Secondly, tv makes it possible for one to keep track of current events and the

第二,电视可以使人及时了解当前大事和科技的最新发展。

Cy. Secondly, there has been a rapid expansion of our national economy.

t人民生活状况的改善原因有两点。首先,我们一直在贯彻执行改革开放政策。

Acetone is mainly used as solvent, and for production of acetone cyanohydrin, MMA and bisphenol A secondly.

丙酮主要用做溶剂,其次是生产丙酮氰醇、MMA和双酚A.2004年我国丙酮的产能为30.1万t/a,主要生产厂家有上海高桥石化、燕山石化、吉林化学工业公司和哈尔滨华宇股份有限公司。

Acetone is mainly used as solvent, and for production of acetone cyanohydrin, MMA and bisphenol A secondly. In 2004 the capacity of acetone in China was 301kt/a. The main producers of acetone in China are Shanghai Gaoqiao Petrochemical Corporation, Beijing Yanshan Chemical Corporation, Jilin Chemical Industry Corporation and Harbin Huayu Co., Ltd.

丙酮主要用做溶剂,其次是生产丙酮氰醇、MMA和双酚A.2004年我国丙酮的产能为30.1 万t/a,主要生产厂家有上海高桥石化、燕山石化、吉林化学工业公司和哈尔滨华宇股份有限公司。

Secondly the fatigue test is carried out under the constant amplitude cyclic loading for the specimens which are exposed in the corrosive environment for equivalent calendar time of zero year, 3 years, 8 years and 13 years.

飞机结构日历寿命的确定与腐蚀环境对飞机结构寿命的影响紧密相连,材料抗疲劳性能随日历年限的变化规律和腐蚀环境作用后的疲劳累积损伤理论是科学地确定飞机结构日历寿命的基础。

This study consists of three parts. Firstly the equivalently accelerative corrosive environment is determined through the analysis of statistic data of corrosion environment. Secondly the fatigue test is carried out under the constant amplitude cyclic loading for the specimens which are exposed in the corrosive environment for equivalent calendar time of zero year, 3 years, 8 years and 13 years. Four S-N curves with different corrosive time are obtained based on the fatigue experiment. Finally the regression method of S-N curves for experimental data is researched and a weighted least square fit is put forward in which the weigh of a group of test data is inversely proportional to the length of the confidence interval.

进行了以下几个方面的工作:(1)通过实测、统计、分析得到了当量加速环境谱;(2)完成了在当量加速环境谱下预腐蚀日历年限0年、3年、8年和13年的腐蚀试验,并进行了成组常幅疲劳试验,得到了不同预腐蚀年限下的S-N曲线;(3)进行预腐蚀后的S-N曲线的数据拟合方法的研究,提出了考虑置信区间长度影响的加权最小二乘法。

Secondly,"the Nodal Green's Function Method For Cylindrical Geometry on Neumann Boundary Condition Based on Green's Functions on slab geometry"is well improved.

论文对"基于平板几何格林函数的第二类边界条件圆柱几何格林函数节块法"做了重要改进。

Secondly, we show the intimate relation between the nonlinear control system and the special geometrical strucure and singular structure of a sphere, a cylindroid and a cone.

刻划了球面、柱面、锥面的特殊曲面几何结构和奇异结构与非线性控制系统之间的内在联系。

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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%。

However, to get a true quote, you will need to provide detailed personal and financial information.

然而,要让一个真正的引用,你需要提供详细的个人和财务信息。