本文主要研究了符号幂等矩阵和对称符号模式矩阵的性质及它们之间的关系，特别是符号幂等矩阵的负元素的个数。
In this paper, we mainly study the sign idempotent of sign patterns, symmetric sign patterns and their relations, especially the number of negative entries that occur in sign idempotent sign pattern.
本文对分子轨道理论教学中关于对称性匹配原则，最大重叠原则， 分子轨道符号及反键效应等几个问题进行了讨论。
The present author discusses the symmetricalmatching principle, the maximum overlapping principle, the molecule orbitalsymbols and the anti-bond effect in the teaching of the molecule orbital theory.
本文基于反对称矩阵的谱集，采用正交相似变换，得到一类具有零对角的符号模式矩阵具有唯一惯量的结论。
Based on the spectral set of skew-symmetric matrix, the result that a class sign pattern matrix with zero diagonal is unique inertia was proved by using orthogonal similarity transformation.
当被测要素为轴线、中心线或对称平面时，指引线的箭头和基准符号应与该要素的尺寸线对齐。
If the element being tested with tolerance requirements is an axis, centre line or symmetrical plane, the arrow and datum symbol should be aligned to the dimension line of that element.
针对频偏对PN序列相关性影响比较明显的问题，提出了一种利用FH序列构造的具有共轭对称性质的训练序列进行符号同步的方案。
Due to the obvious impact of frequency offset on PN sequences, based on the FH sequence, a symbol synchronization scheme with a conjugate symmetric training sequence is proposed.
由于传播者与受众之间的结构性错位，从广告文本的表层结构到深层逻辑都存在着符号不对称性。
Due to the structural dislocation between the transmitter and the audience, there exists a semiotic dissymmetry in the advertising text from the surface framework to its deeper logic.
对一类稳定的具有符号反对称结构的系统进行鲁棒稳定性分析，讨论其鲁棒镇定控制设计问题。
The robust stability analyses for a class of systems with sign-skew symmetric structure are given, and robust controllers design of the systems is discussed.
标记理论是结构主义语言学的重要理论之一，它强调语言符号的极对称现象和这种对立的不平等性。
As one of the most important structuralist theories, markedness theory lays great emphasis on the polarity of linguistic signs and its inequality or asymmetry.
字标是定制字体努特拉反映符号的对称性。
The wordmark was customized from the typeface Neutra to reflect the symmetry of the symbol.
但图3中有两个氢键的对称操作符号确实与表2的不同，因此我用另外的符号表示。
The symmetry operators of hydrogen-bonds given in Table 2 should be the same as those in Fig 3, so one or other needs to be modified.
但图3中有两个氢键的对称操作符号确实与表2的不同，因此我用另外的符号表示。
The symmetry operators of hydrogen-bonds given in Table 2 should be the same as those in Fig 3, so one or other needs to be modified.
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