这两位化学家都非常有远见，他们对周期性的物理性质和化学性质进行分析，并在预示应该出现新元素的地方留下了空位。
Both chemists were sufficiently farsighted to leave gaps where their analyses of periodic physical and chemical properties indicated that new elements should be located.
转移矩阵方法作为一个有力的工具，主要用于具有周期性结构的图的具有给定性质的子结构计数。
Transfer-matrix method is a useful tool. It mainly applies in the substructure enumeration of graphs which have good recurring structures and the substructure has prescribed properties.
结果表明：由光场诱导的双模原子激光呈现周期性的压缩，原子间的相互作用和光场初始压缩因子对原子的压缩性质具有重要影响。
The results show that the atom appears periodically squeezing, and the squeezing properties of atom laser depend closely on both interaction among atoms in BEC and initial squeezing factor of light.
研究了这种周期性偏转与材料性质和激励激光束参数之间的关系。
The relationship between this periodical deflection and material properties and exciting beam parameters is investigated.
原子核性质的周期性开始显示出来了。
区元素同族内某些性质的起伏变化称之为第二周期性。
The second periodicity of element is rise and fall of some properties in elements of the same clan in Parea.
于是从语音产生模型入手，详细的分析了声门闭合时刻语音信号的性质，找到了浊音信号经过小波变换后周期性消失、极值点个数增多的原因。
Based on the speech produce model, we find the reason of periodicity disappearance and the extremum number increase by analysing the character of speech signal when the glottal closes.
本课程集中研究化学中的非过渡元素及其化合物，并强调其对称，结合，周期性及性质的描述。
This course concentrates on the chemistry of non-transition elements and their compounds, with emphasis on symmetry, bonding, periodic properties and the descriptive chemistry of selected groups.
结果表明：材料性质不同，相关信号的周期性明显不同，切削力信号频谱的主峰分布也有所不同。
The results show that the periodicity of correlation signals and the distribution of main peaks in the cutting force spectrum are different as the change of characteristics of materials.
周期函数的周期性是中学数学中的教学内容，掌握了函数的周期性，对函数性质的研究会带来不少方便。
This paper is intended to make a systematic study of periodic functions and to popularize them in teaching and learning.
其实，砌体在周期性剪力作用下具有显著的滞回性质。
However, under cyclic shearing force, brick masonry also undergoes evident hysteretic behaviour.
其实，砌体在周期性剪力作用下具有显著的滞回性质。
However, under cyclic shearing force, brick masonry also undergoes evident hysteretic behaviour.
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