当高层建筑的高宽比较大时，基阶固有频率相对较低；
The basic natural frequency of high-rise buildings with large aspect ratios should be low.
提出了比较精确的计及极限环基阶谐波与三阶谐波的分析计算方法。
This paper presented an analytical method with more accuracy than before considering the fundamental arid the third harmonic in limit cycle.
表面孤子链可以看作把几个不同的基阶孤子按照合适的相位结构组合在一起得到的。
Surface trains can be viewed as higher-order soliton states bound together by several different lowest order solitons with appropriate relative phases.
其中，对于位移插值函数，令其多项式基比孔隙水压力的高一阶，而径向基阶数二者相同。
This method uses one-rank higher polynomial interpolation for displacement than that for pore water pressure, but the rank of radial basis for them is the same.
使用相匹配滤波技术提取基阶面波振型的相位，然后再利用时变滤波进行振幅谱校正，以此分离出基阶振型面波信号。
Phase-matched filter is applied to extract phase of fundamental surface wave, and then time-variable filter is used to correct amplitude spectrum in order to isolate fundamental mode signs.
由分层介质表面两不同点响应互谱分析(SASW)得到的有效相速度并不对应于面波基阶模态相速度，它与波场中高阶模态能量分配比例有关。
Affected by higher Rayleigh wave modes in the surface wave field, the effective phase velocity obtained by spectral analysis of surface waves SASW.
借助一阶逻辑演算有条件地把超限递归原理从序数类推广到具有良基关系的类上。
Let's conditionally generalize principle of transfinite recursion from ordinal number class to class with well-founded relation.
采用高斯径向基函数和一阶剪切变形理论对普通复合材料叠合板的固有频率进行了计算。
The Gaussian radial basis functions and first-order shear deformation theory are presented to calculate the natural frequencies of generally laminated composite plates.
以圆光纤为例，讨论了一阶近似本地场形式及基模场在最大值处的场位移。
Taking the circular fibres for the example, the first order correction local field and field shift in the fundamental mode peak field are discussed.
研究了由对硝基苯基偶氮苯类染料与聚环氧氯丙烷经大分子反应合成的含偶氮苯侧基的共聚醚的二阶非线性光学特性。
Some novel copolyethers containing azo benzene chromophors as side chains have been synthesized by a nucleophilic reaction of various azo dyes with polyepichlorohydrin.
阐述了指数期货中均值回复现象产生的原因，并进而分析了基差变化中的一阶自相关系数在不同情况下的计算方法。
The article analyzed the reasons that aroused the mean reversion in stock index futures, and the calculation methods of the coefficient of the first-order autocorrelation in basis change.
特别地，我们有：具有基的有界bck—代数是有限的，并且理想的阶整除它的阶。
In particular we prove that the bounded BCK-algebra With bases is finite and its order is divided by the orders of its ideals.
对求解过程中的关键问题进行了全面阐述，如目标的几何建模，基函数、权函数的选择，格林函数积分奇异性的加减同阶奇异项处理方法等。为后面的研究工作打下良好的基础。
The key points in the calculation are introduced such as the selection of the basis function and testing function, the way to solve the integral singularity of Green function and so on.
以盐酸为溶剂，N乙酰基D葡萄糖胺为标准品，用紫外一阶导数光度法直接测定壳聚糖的脱乙酰度。
The degree of deacetylation of chitosan was determined directly by 1st derivative UV spectrophotometry using hydrochloric acid as solvent and N acetyl D glucosamine (ACGLSM) as standard.
提出了基于线调频基稀疏信号分解的包络阶次谱方法，并将其应用于变速齿轮箱故障诊断之中。
An envelope order spectrum based on multi-scale chirplet and sparse signal decomposition was proposed and applied to the fault diagnosis of gearboxes with rotating speed fluctuation.
由纤芯基模、一阶包层模式的场分布推得其功率分布 ，进一步得到两种模式的归一化常量。
Power distributions for fundamental core mode and first rank cladding modes are formulated using their field distributions.
北美西部晚坎帕阶的暴龙类化石记录在北部地区的落基山脉（蒙大拿州，艾伯塔）和西南地区（新墨西哥州，犹他州）依然有地理上差距。
The fossil record of late Campanian tyrannosauroids of western North America has a geographic gap between the Northern Rocky Mountain Region (Montana, Alberta) and the Southwest (New Mexico, Utah).
北美西部晚坎帕阶的暴龙类化石记录在北部地区的落基山脉（蒙大拿州，艾伯塔）和西南地区（新墨西哥州，犹他州）依然有地理上差距。
The fossil record of late Campanian tyrannosauroids of western North America has a geographic gap between the Northern Rocky Mountain Region (Montana, Alberta) and the Southwest (New Mexico, Utah).
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