查询词典 atomic clock

Periodic Table Ⅵ B family silver-white metallic luster of the solid metal transition element, atomic number Z = 74, atomic weight of 18385, chemical symbol W, there are five kinds of natural F stable isotopes, 18174W, 18274W, 18374W, 18474W, 18574W and eight kinds of radioisotopes .

周期表中ⅥB族银白色金属光泽的固体金属过渡元素，原子序数Z＝74，原子量18385，化学符号W，有五种自然F 稳定同位素，18174W、18274W、18374W、18474W、18574W和八种放射性同位素。

The results show that, for the elasto-plastic contact of tip-substrate approach and separation process, the material plastic yielding in the atomic level is still governed by the von Mises criterion. For the adhesion of flat-ended wedges, continuum mechanics can be still applied down to a few lattice constants within the contact region, and give reasonable results, apart from the discrepancies near the contact edges. Moreover, adhesion hysteresis occurs during unloading due to the atomic steps, where the unloading curve does not coincide with the loading one. This in turn supports the presumption proposed by Pollock for the adhesion of stepped spheres.

本文首先对针尖—基体模型的弹塑性接触机理进行了深入研究，指出在原子水平上材料的塑性屈服仍由Von Mises准则控制；对平底锥冲头粘着接触的模拟表明，除了在接触区边缘附近有一定差别外，接触力学方法在接触区内几个晶格常数范围内仍能给出令人满意的结果；由于原子台阶效应，加载与卸载曲线不重合，出现粘着滞后，证实了Pollock关于具有纳米阶梯结构的球体粘着滞后现象的推测。

In Chapter 1, it introduces atomic force microscopy as a widely used tool in surface measurement and how electrostatic force effects the deviation in measurement using the frequency-modulated atomic force microscopy during the research.

第一章先介绍已被广泛应用在表面量测的重要工具─原子力显微镜，再介绍先前文献对静电力造成频率调制原子力显微镜量测误差之研究。

Surface properties of Kapton without and with ograno siloxane coating were analyzed after exposure to ground state fast atomic oxygen radiation in a ground simulated atomic oxygen beam facility.X-ray photoele c tron spectroscopy,I.R.spectroscopy and scanning electron microscopy were used to characterize the chemical and physical changes of the surface of materials test ed.

用光电子能谱、红外光谱和扫描电镜研究有和无有机硅涂层的聚酰亚胺在模拟原子氧环境中表面所发生的侵蚀作用。

The first Chinese atomic device, which had been tested the month before on October 16, had a yield of 22 kilotons and weighed 1,550 kg, far too heavy for the DF-2A (when the 200 kg reentry vehicle aeroshell had been added). On December 13, the Defense Science and Technology Commission, which oversaw both the missile and nuclear bomb programs, demanded the reduction of the weight and size of the first operational atomic bomb in order to fit it on the DF-2 A.

中国人的首个核装置于一个月前，即10月16日进行了爆炸试验，2.2万吨的当量，重1，550公斤，远远超过东风2A的负载能力（考虑到还要加上200公斤的再入段弹头载具）。10月13日，负责监督导弹与核弹两个项目的国防科工委要求减少首个作战用核弹的重量和尺寸以便使其能够装入到东风2A上。1965年11月，两弹合一的导弹成功进行了飞行试验，但核弹头此时仍未完成改进。

In this lecture, the study content of nonlinear atom optics and their experimental results and recent progress are introduced in some detail, which includes atomic solitons, four-wave mixing, slow light group-velocity and superluminal light, superfluid and vortex, Josephson effect and phase-coherent amplification of atomic matter waves, and so on

文章重点介绍了非线性原子光学的研究内容、实验结果及其最新进展，主要包括原子孤子、原子物质波中的四波混频、光速减慢与负群速现象、超流及涡流、Josephson效应和物质波的相位相干放大等。

In a word, a new method that theoretically calculates the relativistic corrections and the fine structure of the energy levels in two-electron atom, including the atomic Hamiltonian expressed by spherical tensors, the calculation of the angular matrix elements and the summations over spin of the various interactions in the atomic Hamiltonian, and the approximate calculation of the radial matrix elements, has been provided in this thesis.

总之，本文为双电子原子能级的相对论修正和精细结构的理论计算提供了一种新的方法，包括原子哈密顿算符的球张量表示方法、原子哈密顿中各种相互作用项的角向矩阵元和自旋求和的计算方法，以及径向矩阵元的近似计算方法。

Our research indicates that the electronegativity of elements varied with the intensive electrostatic potential of atomic nucleus Vic and the quantity of electricity of atomic valence shell qcj.

研究表明，元素电负性XSc与原子核在原子边界面上的强度电势Vic和价层电子电量qcj成线性关系。

Our research indicates that the electronegativity of elements X(subscript Sc varied with the intensive electrostatic potential of atomic nucleus V and the quantity of electricity of atomic valence shell q.

研究表明，元素电负性X与原子核在原子边界面上的强度电势V和价层电子电量q成线性关系。

We discuss the influences of the initial state of the field on the atomic information entropy squeezing. We compare its results with those of atomic squeezing based on the Hesienbeg uncertainty relation.

讨论了场的初态对信息熵压缩的因影响，并且比较了分别从基于信息熵测不准关系和海森堡测不准关系出发得出的结果。

After explaining total design of automated test system for microcircuit , the thesis introduces GPIB standard .

文章在说明了微电路模块自动测试系统的总体设计后，对GPIB标准进行了介绍。

He interceded in my behalf.

他替我说情。