相对论

The present dissertation gives experimental, theoretical and PIC simulative research on the plasma-filled two-stage backward-wave oscillator and free-electron laser . In experiment, both an unmagnetized plasmafilled and a magnetized plasma-filled RBWO-FEL are studied.

本文在国家&863&计划及国家自然科学基金的资助下，从实验、理论和粒子模拟三个方面全面深入地研究了等离子体填充的相对论返波管-自由电子激光产生高功率微波及激光的物理过程。

The dispersion relations of superluminal waves for the longitudinal collective modes in unmagnetized, collisionless and homogeneous relativistic electron-positron plasmas are derived.

导出了无磁化无碰撞各向同性相对论正负电子对等离子体纵波的色散关系。

Based on the analysis of the Jahn-Teller effect,vibronic interaction and the resolution of group representations, the possiblegcometrical configurations of 〓 have been derived for the first time, the results arein good agreement with the calculation esults.Firstly, the reasonable dissociative limits for the diatomic molecules of ZrCo,ZrH, CoH, UH,〓 and AlNi have been derived based on the Atomic and MolecularReactive Statics and the resolution of group representations. The groundelectronic states, which are 〓,〓,〓 and 〓 respectively for thesemolecules, have also been optimized based on the RECP method.

本文根据相对论有效原子实势和密度泛函理论方法(B3LYP／SDD与B3LYP／6-311G〓)，用Gaussian-98W程序研究了ZrCo、ZrH、CoH、UH、〓、AlNi、〓、HZrCo和〓分子的分子结构、分析势能函数、微观力学性质和光谱性质；首次建立了计算固体金属氢化物体系宏观性质理论模型，并应用于ZrCo、Zr和Co的氢化反应体系研究，理论计算与实验结果基本一致；基于Monte-Carlo准经典轨线方法，首次研究了H与ZrCo和Co与HZr的分子反应动力学。

We prove the relativistic virial theorem, which gives simple criteria for the absence of embedded eigenvalues in certain regions of the continuous spectrum.

我们证明相对论维里定理，这定理对于连续谱空间里本征值的缺乏给出了简单的标准。

Gravitation as spacetime curvature is introduced and the field equations of general relativity derived.

引力时空曲率的介绍和广义相对论的场方程导出。

Sit with a pretty girl for an hour, and it seems like a minute.

爱因斯坦晚年与青年学生座谈时曾提出相对论定义科普版：如果你和一个美女一起坐了两小时，你会认为仅仅是一分钟；如果你在通红的火炉上坐了一分钟，你会认为已经过了两小时。

Put your hand on a hot stove for a minute, and it seems an hour; sit with a pretty girl for an hour, and it like a minute.

把手放在滚烫的火炉上一分钟，感觉像一小时那么久；而与一个美丽的女孩在一起坐一小时，感觉只有一分钟那么短，这就是相对论。

Put your hand on a hot stove for a minute, and it seems an hour; sit with a pretty girl for an hour, and it like a minute.That's relativity.

把手放在滚烫的火炉上一分钟，感觉像一小时那么久；而与一个美丽的女孩在一起坐一小时，感觉只有一分钟那么短，这就是相对论。

Study of X-rays from accreting black holes will enable us to learn the nature of the accretion physics and test the theory of general relativity eventually.

黑洞吸积与辐射是天体物理中的热点问题，通过对黑洞X射线辐射的研究，人们可以了解吸积的物理过程并最终认证广义相对论。

The articulation of the theory of relativity catapulted Albert Einstein to the pinnacle of fame.

相对论的问世将艾尔伯特·爱因斯坦推到了名誉的顶峰。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失