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The reaction mechanism of thione-thiol tautomerism for 2,6-dithiopurine obtained from proton transfer has been investigated by DFT B3LYP method with 6-311＋G basis set. The reaction enthalpies, activation energies, activation free energies and the rate constants of tautomerism were obtained.

采用密度泛函B3LYP方法，在6-311＋G基组水平上对2，6-二巯基嘌呤质子转移引起的硫醇式与硫酮式互变异构反应进行了计算研究，获得了互变异构过程的反应焓、活化能、活化吉布斯自由能和质子转移反应的速率常数等性质。

Application of the same Manson-Haferd constants (450, 15) results in a good prediction tendance.

这为材料高温持久性能的比较及精确预测提供了便利的方法。

The perturbation formulas of the electron paramagnetic resonance parameters g factors g(subscript //), g(subscript ⊥) and the hyperfine structure constants A(subscript //), A(subscript ⊥) are established for a 3d(superscript 1) ion in tetragonally distorted octahedra, by including the contributions from the p-and s-orbitals as well as the spin-orbit coupling of the ligands based on the cluster approach.

采用离子簇模型，通过分析配体轨道和旋轨耦合作用的贡献，建立了改进的3d1离子在四角畸变八面体中电子顺磁共振参量的微扰公式，能级间距可由重叠模型和局部结构数据给出。

The development of WIMS 82-group library WIMS-D is a lattice code for thermal reactor, and it has its own 69-group multi-group constants library.

WIMS 82群截面库的研制 WIMS/D是一个适用于热中子反应堆计算的栅元计算程序，WIMS 69群群截面库是其本身所带的工作库，该库的能量上限为10MeV。

Thermal effect on the equivalent spring constants of double-clamped beams with two kinds of mass arrangements including central mass and side mass were studied by theoretical analysis and finite element simulation.

通过理论研究和有限元仿真分析了热效应对两种不同质量块布局的双端固支梁的等效弹簧系数的影响，两种质量块分别布局为质量块与梁对称布置和质量块位于梁平面一侧布置。

Nevertheless, the more classical methods based on titrimetry, colorimetry, spectrophotometry, single or multiple partitions, or changes in physical constants lose none of their previous validities.

但无论怎样，以滴定法、比色法、分光光度法基础的比较经典的方法，单个或多个分类、或物理常数方面的改变（或任何其他形式的检测或分析），并未失去它们原有的有效性。

And yet there were constants—the AT Café, Timezone 8 bookstore—that, like coming through the airport expressway tollgate or driving past Tian'anmen, convinced me I had arrived, however briefly, back in the northern capital.

但也有屹立不倒的老住户——AT咖啡店、东八时区书店——就像通过机场高速的收费站或者路过天安门广场，它们的存在让我确信，不管停留时间有多短，我的确是回到了北国首都。

We solve the problem that the meridional curve transcendental equation cannot solve by Matlab, and discuss the influence of two curves for different grating constants and different incidence angles.

用Matlab软件解决了子午聚焦曲线超越方程无法解的困难；讨论了不同光栅常数和入射角度时对两聚焦曲线拟合程度的影响。

Because of the speciality of the elasticity constants, the elasticity problem of one dimensional trigonal QCs is more complicated.

由于一维三方准晶弹性常数的特殊，导致了其弹性问题比较复杂。

Trilemma effect is an important criteria for the self-convergence deflection system.The influence of the higher order Trilemma effect should be taken into account for the correction of the higher-order deflection aberrations.In this paper,when up to the seventh-order Trilemma constants are adjusted,the expression of the influence of 2n-pole multipole field on n-th order Trilemma constant has been deduced and this influence has been calculated.

Trilemma效应［1，2］是在彩色显像管中应用自会聚偏转系统对偏转像差校正时所必须考虑的一个重要问题，在大偏转角下对高级偏转像差的校正必须考虑高阶Trilemma效应的影响，文献［3］应用多极场偏转像差校正理论［4，5，6］，采用区域分割的方法，对直至七阶的Trilemma效应进行了分析，在文献［3］中对Trilemma效应分析时，用到了下面的近似

Anna: No, I've got a hangover.

不是，我昨晚宿醉了。

We head into the mountains in Su's new Land Cruiser, stop for lunch at a scenic restaurant and then hang around drinking beer and eating fruit as two of his employees attempt to lure the birds with a tape recording of the fowl's mating call.

我们坐上苏的巡逻车向山顶出发，在一家风景优美的餐馆吃了中饭。然后我们喝着啤酒吃着水果四处逛。