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Based on the elastic theory of large deflection and by taking into account the variation of the axial force and its effects on bending deformation of the drillstring in vertical section,the vibration of the drillstring induced by fluctuating weight-on-bit is described by a parametrically excited system.A Mathieu equation describing the system is established by Galerkin Method.By extending the solution into a Fourier series,the curves of dynamic bifurcation values and the dynamically unstable regions surrounded by the curves are presented.

基于弹性大变形理论，考虑到轴力沿钻柱轴线的变化及其对钻柱弯曲变形的影响等因素，将受自重作用的铅垂井段钻柱在波动钻压激励下的振动转化为一个参数激励系统，用Galerkin方法首次得到了描述此系统的Mathieu方程，并通过将方程的解展成富里叶级数的方法，得到了该振动系统的动力分岔值曲线及其所包围的动力不稳定区。

Methods: Mesityl oxide in the air was sampled by active carbon tube and desorbed by the solvent of carbon disulfide which included 1% methanol, then separated by HP-5 capillary column,and finally detected by mass detector.

工作场所空气用活性炭管采集，经1%甲醇的二硫化碳溶液解吸，HP-5毛细色谱柱分离，气质联用仪检测。

We expect it will benefit the industry field to break through the optical measuring limits at present by offering some new ideas. Optical measuring research based on moire interferometry has developed for several decades. The main idea of this research is to utilize the moire effect caused by two superimposed gratings of identical or similar spatial frequency. One is the reference grating and it is a virtual grating created by a computer program in this research; The other grating is the image of grating projected on the measured surface by the DLP projector, and this grating will distort because of the different sloped profile of the surface. To superimpose the program-created grating and the captured distorted grating will derive the so-called moire effect. This research combined the basic theory of optical interferometry and moire effect to project the different phases of the projected grating fringes by the phase-shifting method and compute the principal value of arguments between -π,π. In the end, the phase unwrapping program based on discrete Fourier transform of solving PDEs is used to unwrap the phase of the measured surface, and finally the surface profile is derived by the optical measuring system.

以叠纹干涉术为基础的光学检测研究之发展早已行之有年，而在本研究中所采用的投影叠纹法(Projection moiré)之主要精神在於藉由两道空间频率相近或相同的光栅相互叠加而成的效应，其中一道为参考光栅，而本研究中的参考光栅是以程式产生可调整不同空间频率的虚拟光栅；另一道则为投影至待测物表面的光栅影像，而在起伏高度不一的待测表面上的光栅影像会受到待测物表面起伏状况不同而在观测方向产生光栅投影条纹影像的歪曲变形，将电脑产生的参考光栅与由影像撷取装置所获取投影於待测物表面的光栅影像作叠合，便会产生所谓的叠纹效应；利用基本的光学干涉理论与叠纹效应结合，本研究中以相移法来改变投影於待测表面的光栅相位，再以相移法的理论反运算出在带有待测面各点高度资讯之介於-π，π相位主幅角，再以离散傅立叶转换解偏微分方程的相位重建程式还原待测面的相位值，以得知待测面之表面轮廓。

For instance, the concert of NDR Symphony Orchestra under the baton of Maestro Christoph Eschenbac, the concert by Sir James Galway (nicknamed \"the man with the golden flute\"), the Flamenco dance theatre \"Salome\", the Canadian multi-media theatre Leitmotif, the gala performance by the leading soloists of the New York City Ballet, the concert by renowned Italian vocalist Robertino, the concert by Jamaica Reggae, the concert by John Miller Big Band Orchestra, and the recital by famous Chinese baritone Liao Changyong, etc.

特别值得关注的是，上海音像出版社每年都成功地将唱片制作、销售与演出运作结合，获得较好的社会评价和经济效益。比如成功承办了世界指挥大师艾森巴赫执棒的音乐会、被誉为"世界第一长笛"的詹姆斯？高威音乐会、西班牙著名舞蹈家阿依达？戈麦斯领衔的弗拉明戈舞剧《莎乐美》、加拿大著名多媒体剧《震颤》以及受到观众热烈欢迎的美国纽约城市芭蕾舞团领舞独舞专场、意大利著名歌唱家罗伯蒂尼独唱音乐会、牙买加雷鬼乐队音乐会、英国约翰？

In order to prove that the sensitivities to spatial impression of sound localization depend on the structural characteristics of music, other three sound sources including Motif A ( Royal Pavane by Gibbon,τe = 127ms), Motif B ( Sinfonietta,Opus 48;Ⅳ movement; Allegro con brio by Arnold,τe =35 ms) and Motif S ( Speech, female,τe =23 ms) were adopted.

为证明空间声源定位的敏感性取决于音乐的结构特性，文中以样本A(Royal Pavane by Gibbon，τe=127ms)、样本B(Sinfonietta， Opus 48；Ⅳ movement； Allegro con brio by Arnold，τe=35ms)和样本S(Speech，female，τe=23ms)为音乐样本，根据Y。

By applying the optimal tool parameters, the maximum tooth contact pressure is reduced by 45% and the maximum angular position error of the driven gear by 60%, in regard to the spiral bevel gear pair with a pinion manufactured by a cutter of straight-sided prole and of diameter determined by the commonly used methods.

通过应用参数的最佳工具，最大齿接触压力减少了45％，而最高的从动齿轮角位置误差60％，在关于由一个螺旋直齿轮刀具制造了一对锥齿轮双面形象和所常用的方法确定的直径。

Discharging radioactive waste liquid not by the prescribed means, or discharging radioactive waste liquid by using soakaway, seepage pit, natural crevice, karst cave or by other means prohibited by the State

不按照规定的方式排放放射性废液，利用渗井、渗坑、天然裂隙、溶洞或者国家禁止的其他方式排放放射性废液的

The stable and reliable operation voltage of the probe can be given by the following methods:(1) 20% light coupling efficiency is obtained by direct coupling of LD-optical fiber.(2) The light power is transmitted by multi-model optical fiber.(3) The largest photo-electric conversion efficiency is achieved by selecting the transformer regulation of step-up transformer.(4) The stable light intensity is achieved by using LD light feedback of driving circuit and refrigeration.

通过下述方法可提供稳定、可靠的探头工作电压：LD—光纤的直接耦合方式，可实现20％左右的光耦合效率；采用多模光纤传输功率；选择升压变压器最佳变比提高光电转换效率；采取LD驱动电路光反馈以及致冷措施使其发光幅值稳定。

The prizes for physics and chemistry shall be awarded by the Swedish Academy of Sciences; that for physiological or medical works by the Caroline Institute in Stockholm; that for literature by the Academy in Stockholm; and that for champions of peace by a committee of five persons to be elected by the Norwegian Storting.

物理学奖和化学奖将有瑞典科学院颁发；生理学和医学奖将由斯德哥尔摩的凯若琳学院颁发；文学奖将由斯德哥尔摩的瑞典文学院颁发；和平奖的患上主将由挪威国会推选出的五人委员会决定。

The prizes for physics and chemistry shall be awarded by the Swedish Academy of Sciences; that for physiology or medical works by the Karolinska Institute in Stockholm; that for literature by the Academy in Stockholm, and that for champions of peace by a committee of five persons to be elected by the Norwegian Storting.

物理学及化学奖将由瑞典科学院授予；生理学或医学奖将由斯德哥尔摩的卡罗琳斯卡医学院授予；文学奖将由斯德哥尔摩的学院授予；而和平战士（注：champions of peace，诺贝尔的原文）奖由挪威国会选出的5 人委员会授予。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。