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Then, using the second-order central difference to discretize the time derivative of the displacement, and applying the quadrature formula to the mass matrix, a fully discrete lumped mass Morley element method i...

然后利用中心差分格式离散时间方向的二阶导数，再利用适当的求积公式得到薄板弯曲问题的集中质量Morley元全离散格式。

The structure of quadrupole mass spectrometers and the quantitative analysis principle of gas analysis mass spectrometers are described.

叙述了四极质谱的结构和气体分析质谱的定量分析工作原理。

Quadrupole mass filter is a matured miniature mass spectrometer that has been widely used.

四极杆质谱仪是目前最成熟、应用最广泛的小型质谱仪之一。四极杆质量分析器通过在双曲面四极

However, compared to other approaches, such as radioisotope tracers or mass analysis by mass spectrometry, NMR is sensitivity limited.

但是同其他检测方法相比，如放射性示踪剂或质谱分析方法，NMR的敏感性是有限的。

The elements of optical waveguide strain-stress measurement and fiber bragg grating strain-stress measurement system based on wavelength division multiplexing and spatial division multiplexing are emphatically discussed; the displacement regularity of stress field induced by roadway group excavating and short wall mining process is analyzed in detail; the concept of roadway "equivalent radius","correcting coefficient of coal and rock mass mechanical parameters",and "mining affecting coefficient" is put forward; the calculation method of "equivalent radius", the method of inversion of "correcting coefficient of coal and rock mass mechanical parameters", and the "mining affecting coefficient" determination method with the field measurement results and so on are provided.

重点研究了光波导应力应变测量原理，以及基于波分复用和空分复用技术基础上的布拉格光纤光栅应力应变测量体系；详细分析了近距离巷道群开掘工作和短壁体系回采工作诱发的应力场的重新分布规律；提出了巷道"当量半径"、"煤岩体力学参数修正系数"、"采动影响系数"等概念；给出了"当量半径"的计算方法、"煤岩体力学参数修正系数"的反分析求算方法、以及通过现

Considering the randomness of both elastic module and mass density of the structures, the element′s structural stiff and mass matrix have been built, the structure dynamic characteristics is analyzed based on probability, and the digit characteristics of natural frequency random variable is derived from the Rayleigh′s quotient.

利用随机因子法，建立了考虑结构弹性模量和质量密度同时具有随机性时结构的刚度矩阵和质量矩阵；从结构振动的瑞利商表达式出发，利用代数综合法推导出结构特征值随机变量数字特征的计算表达式。

All of these elements interact to create a distinctive 'mass-forward' form, in contrast to the rearwards mass bias of some other cruisers.

所有这些因素的互动，以创造一个独特的'群众前进'的形式，相反，向rearwards大规模的偏见其他一些巡洋舰。

However, there is no systematic analysis of the distribution of the mass/charge error and the data recalibration of Ion Trap Mass Spectrometry.

目前对影响离子阱质谱仪质荷比测量误差的因素和数据产出后系统误差的校正方法还没有系统的分析。

Based on the mass/charge error distribution, a recalibration scheme is proposed and an experiential formula which is used to determine the mass/charge error tolerance in different relative intensity is provided.

在此基础上，提出了一种对质谱数据进行系统误差再校正的方法和一种根据信号强度确定误差容限的模型。

Based on analysis and comparison of the principle, method and form of train mass calculation and the correlative" select-judge value" for raising speed train,a change of particular attention from train mass to train speed is recommended in this paper,and the second critical gradient between the recommendatory maximum speed method and the traditional calculative speed method is established to the "select-judge value".

本文在分析与比较提速列车质量计算的原则和方式方法以及相关的选择判别值的基础上，提出应从传统的侧重列车质量的方式转向侧重运行速度的方式，并最终确立第二临界坡度为推荐的最高速度法与传统的计算速度法的选择判别值。

In other research, chondroitin is being investigated for use in several other conditions.

在其它研究，软骨素被调查用於几个其它情况。

They would make fun of him for having to work.

他们拿他的工作来开玩笑。