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We investigate a simple atom laser model by introducing phenomenologically gain and loss terms in the GP equation, noting that we don't consider output coupling in this model, and discuss analytically threshold and stability of lasering mode.

我们研究了一个简单的原子激光器模型。这个模型是一个被引入增益和衰减项后的GP方程，注意，在这个模型中我们没有考虑输出耦合。

Our theory predicts the minimum value of ponderomotive parameter and the corresponding critical laser intensity, below which no diffraction can occur; 6, We studied the energy transfer of a two-level atom moving in a cavity field, as well as its influence on the atomic emission spectra and on the photon distribution of the intro-cavity field.

我们用两对激光模来模拟紧聚焦的高斯光场，成功地得到了《Nautre》上Batleaan等人的实验观测结果，预言了有待实验进一步观测的新现象，并确立了发生电子衍射的激光场的临界强度； 6，研究了原子在激光场中运动时光场与原子之间的能量交换，以及这种能量在光谱上的反映和对激光场统计性质的影响。

The distribution of prolyl peptide bond conformations, Ramatrandran distribution, atom distance of main chain, distribution of conformation energy after 300 times simulated annealing are analyzed.

通过模拟退火的分子动力学方法，对2种BPP分子的4种构象(cis-BPP-5b、trans-BPP-5b、cis-BPP-9a、trans-BPP-9a)在经过300次模拟退火后的脯氨酸肽键的构象分布、Ramatrandran分布、主链上原子距离、构象能量的分布进行了统计分析。

The effect of silicon atom in substrate on the reaction rate and the stereoselectivity of enzymatic reactions was revealed by comparison of horse liver alcohol dehydrogenase-catalyzed stereoselective dehydrogenation of the three isomers of acetyltrimethyl propanone and their carbon analogues in aqueous/organic biphasic systems.

本项目通过对比在水－有机溶剂两相系统中，马肝醇脱氢酶催化三甲基硅烷丙酮的三个异构体及其碳类似物的光学选择性脱氢反应，揭示了底物中的硅原子对酶反应速度、立体选择性的影响规律，成功地合成了高对映体纯度的手性有机硅醇，并实现了辅酶的再生。

We have seen this journey from a single atom to a complex protoplasmic biological phenomenon called life.

我们看到，这次旅行已经从一个简单的原子抵达我们称之为生命的最基本的生物现象。

Dinger, who was one of the pioneers of quantum mechanics, imagined putting a cat, a flask of Prussic acid, a radioactive atom, a Geiger counter, an electric relay and a hammer in a sealed box.

&薛定谔的猫&是最著名的未证实实验之一。1935年，量子力学的先驱之一，艾尔文·薛定谔提出了一个妙想：把一只猫、一个装有氢氰酸的烧瓶、一枚放射性原子、一个盖格计数仪、一个继电器和一把锤子一起放置到一个密封的盒子中组成一个装置，如果放射性原子衰变，盖格计数仪将探测到放射性，之后向继电器发送信号使其断开，从而释放之前被固定的锤子，锤子会将砸碎烧瓶并释放其中的氢氰酸，盒子里的猫于是被毒死。

In 1935 Erwin Schr dinger, who was one of the pioneers of quantum mechanics, imagined putting a cat, a flask of Prussic acid, a radioactive atom, a Geiger counter, an electric relay and a hammer in a sealed box.

&薛定谔的猫&是最著名的未证实实验之一。1935年，量子力学的先驱之一，艾尔文·薛定谔提出了一个妙想：把一只猫、一个装有氢氰酸的烧瓶、一枚放射性原子、一个盖格计数仪、一个继电器和一把锤子一起放置到一个密封的盒子中组成一个装置，如果放射性原子衰变，盖格计数仪将探测到放射性，之后向继电器发送信号使其断开，从而释放之前被固定的锤子，锤子会将砸碎烧瓶并释放其中的氢氰酸，盒子里的猫于是被毒死。

The results show thatthe substitutions containing sulfur atom in the pyrazole ring remarkably affectthe steric and electronic properties of the pyrazole ligands.

因此，我们研究了吡唑环上带上S原子取代基对形成双吡唑烷配体及其与VIB金属羰基配合物的光化学反应的影响。

The study of crystal structure indicates that the complexes belongs to tetragonal,14(1)/a, a=b=27.047(5) A, c=14.103(3) A, a=b=y =90,V=10317(4)A3, Z=16, Dc=1.071g/cm3, F(000)=3408, R,=0.1395, R2=0.1766 and every unit of the tetranuclear complexes is four-coordinated to tridentate ligand and nitrogen atom in pyrazolone from other ligand. The complexes is slightly deformed square-planar geometry.

晶体结构研究表明，该配合物为四方晶系，空间群I4(1)/a，a=b=27.047(5)，c=14.103(3)，α=β=γ=90°，V=10317(4)，Z=16，Dc=1.071g/cm~3，F(000)=3408，R_1=0.1395，ωR_2=0.1766，其结构单元是由一个三齿配体中的ONO和另一个配体吡唑啉酮环二位上的N配位后形成略微畸变的平面四边形构型，其中Cu的配位数为4。

It is rationalized by the electron-withdrawing property of the pyridyl group due to the presence of N atom.

此结果是由于吡啶环上的氮原子具有较碳更大的电负性，因而有利于电子的转移，使反应得以进行。

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％。