自振

A spin polarizer is a device that allows atoms of only one definite spin orientation to pass through it.

自旋偏振器是这样一种装置，它只允许具有某一确定自旋取向的原子通过。

The major factors to make machine tools vibration are external excitation and self-excitation.

工具机所引起振动主要因素为外力激振与自激激振。

It is the gas that drives the exciter and accomplishes sympathetic vibration to make stickup layer break off then achieve the goal of clear for tramcar.

以气体自激振动原理，设计了一种激振器，利用气源驱动激振器使矿车达到共振，从而使附着在矿车底部的黏底层自行脱落，达到清车的目的。

For finding the best work function of SCC, SCC is requested to have favorable filling performance, rebar clearance passing performance and cohesiveness, and prevented from bleeding and segregation under the premise of assure that SCC"s flowing property due to by dint of rheology theory and analyse mechanism on concrete"s vibrationless moulding and compact.

为了得到自密实高性能混凝土的最佳工作性能，在研究中借助流变学理论，分析研究了混凝土拌合物免振捣成型和密实的机理，在保证自密实混凝土流动性的前提下，要求混凝土具有良好的填充性、钢筋间隙通过性和粘聚性，防止泌水、离析，解决了流动能力与抗离析能力的矛盾。

From the computed results, the following preliminary conclusions can be drawn: the time domain analysis of the buffeting response is feasible by using the indicial function formulae of the self—exciting force; usually, the linear analysis method will overestimate the buffeting response.

由本文的计算结果还可得出如下初步结论：利用自激力的阶跃函数表达法对抖振响应进行时域分析是可行的；通常的线性分析方法将偏大地估计抖振响应。

The vibrometer can keep long-term stable operation and is able to meet the real-time and high-precision requirements. The vibrometer can develop towards miniature, intelligent and portable. It has broad application prospects.

实验表明，研制的半导体激光自混合测振仪能够较好的恢复出振动源的振动波形以及其他振动参数，能够满足实时性和高精度方面的要求，有可能发展成便携式激光测振仪，具有小型化和智能化优点，有着广泛的应用前景。

We performed a simulative test, which confirms that wavelet analysis can separate annual wobble and Chandler wobble. Our results show that this method can be used in astronomical geodynamies effectively. This paper is divided into two parts. The first is about statistic characteristic of polar motion. Polar motion includes secular motion, long period fluctuations, Chandler wobble, annual wobble and high frequency wobble. The secular motion is 3.4mas/year and towards 760W meridian. Long period fluctuations have difference periods in x-axis and y-axis. They are 31.7-year and 24-year in x-axis and 28.5-year and 22.9-year in y-axis. These 2~? decades fluctuations have an amplitude of about 30 mas , and are very nearly linearly polarized, with the observed motion of pole being almost entirely along a line between 360E and 1440W. There is a 55.4-year wobble whose amplitude is 9 mas. The amplitude of the interannual fluctuations is about 4? mas. The amplitude of long period fluctuations decreased after 1970. The annual wobble is a steady wobble. It retrograde wobble is only 1/20 of prograde wobble in amplitude.

本文的工作主要分为两部分：第一部分是通过分析POLE97序列，我们对极移的统计特性有了一个较全面的认识，极移主要包括趋势项、长周期项、Chandler项、周年项和高频项：趋势项的方向是西经76°，速度为每年3.4mas；长周期项中Markowitz 项在X、Y两个方向有不同的周期，它们分别是：X方向的两个周期是31.7年和24 年，Y方向的两个周期为28.5年和22.9年它们叠加在一起是一个线偏振运动，最大振幅约为30mas，偏振方向在西经144°和东经36°之间；极移的长周期波动中还存在一个 55.4年周期的圆周运动，振幅约为9mas；十年尺度变化的振幅在4～6mas之间，在Y 方向十年尺度的成份比较多，它们的周期在X方向和Y方向不是对应的；从七十年代年开始长周期变化的振幅明显降低；周年项是一个振幅稳定的摆动，在X、Y两个方向的振幅略有差别，逆向运动振幅大约为顺向运动振幅的1/20；Chandler摆动的振幅自1900年以来经历了几次较大的变化，其中包括1915年和1955年两次极大值，振幅分别达到0&。25和0&。28，以及1925～1940期间小于0.09的过程，Chandler项在X、Y 两个方向的振幅几乎完全相等，其逆向运动振幅不到顺向运动振幅的1/50。

Three-dimension finite element of off-highway dump cab with rubber isolator is set up Static strength analysis and modal analysis are conducted Distribution of stress in typical operating mode, the first 10 mode natural frequencies and mode shapes are obtained The conclusion is that the static stress will not lead to the breakage of ca

建立了考虑橡胶减振块的某非公路自卸卡车驾驶室三维有限元模型，进行了驾驶室的静强度分析及模态分析；得到了典型工况下的驾驶室应力分布规律和驾驶室的前 10阶固有频率及振型。

Description: This project shall adopt the double-mixing-shaft reciprocal rotary distribution design, with the vibration excitation/isolation system to be floating-connected by double-seated spring and hydraulic system adopting highly-dynamic performance proportion, making unnecessary a separate motor for driving and ensuring high compactness of blocks. The machine should make less noise than similar products, operate quickly, reduce the impact upon change of direction and save energy. Each joint should be linked with knuckle bearing and provided with lubricating device to prevent wear and tear. The automatic control system should use PLC and HMI display of operation, providing accurate and explicit detection of faults.

内容说明：本项目采用双搅拌轴往复旋转布料设计，激振隔振系统采用双座双弹簧浮动连接，液压系统采用高动态性能比例，可使砌块成型机不需要单独电机驱动，能保证砌块密实度大；机台噪声比同类机台小，运行快速，降低变向时的冲击配备，节约能源；各关节部位均用关节轴承联结，具备润滑装置不易磨损；自控制系统选用PLC编制控制器，操作人机界面显示，故障准确明确。

Spatiotemporal self-compression of high-intensity femtosecond pulses with linear and circular polarization in normally dispersive media is experimentally studied.

实验研究了圆偏振和线偏振高强度飞秒激光脉冲在正常色散材料中传输时的时空自压缩现象。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。