查询词典 simultaneous equations

Then, we combine the analysis of the scale-effects with the simplification of the NavierStokes equations, and study numerically the feasibility and efficiency of the generalized diffusion parabolized Navier-Stokes equations and the large-small scale equations applying to the high Reynolds number flows (GNS for laminar flow and LSS for turbulent flow).

首先从数值方法上构造了一些高精度差分格式，然后将尺度效应的分析与流体力学基本方程组的简化近似相结合，通过数值分析和计算研究了广义扩散抛物化NS方程组和流体运动大小尺度方程组用于高Re数流动的可行性和有效性。

The dynamics equations of soil water vaporizing and ammonia volatilizing hcluding the factors of water and temperature, and the dynamics-like equation of urea transforming into ammonium nitrogen in soil are founded in the paper, by taking the effect of interaction of water and temperature as subject, the dynamic change character of object studied as basis and using principle of chemical dynamic; The empirio-equations of soil water retention curve including temperature and the empirio-equations including temperature between water potential of millet seedling leaves and soil water are founded in order to make the equation of relation between water potential and water content in soil suit the demand of temperature change much better.

本文以水热耦合效应为主题，基于研究对象的动态变化特征，应用化学动力学原理，建立了含水、热因子以及水热耦合效应的土壤水分蒸发、肥料氨挥发动力学方程，以及施入土壤中的尿素转化为铵态氮的动力学型方程；为使水势—含水量关系式更好适应变温条件应用的要求，建立了含温度因子直接表征土壤持水曲线的经验方程，以及含温度因子的谷苗叶水势与土壤含水量关系经验方程。

The dynamics equations of soil water vaporizing and ammonia volatilizing hcluding the factors of water and temperature, and the dynamics-like equation of urea transforming into ammonium nitrogen in soil are founded in the paper, by taking the effect of interaction of water and temperature as subject, the dynamic change character of object studied as basis and using principle of chemical dynamic; The empirio-equations of soil water retention curve including temperature and the empirio-equations including temperature between water potential of millet seedling leaves and soil water are founded in order to make the equation of relation between water potential and water content in soil suit the demand of temperature change much better.

本文以水热耦合效应为主题，基于研究对象的动态变化特征，应用化学动力学原理，建立了含水、热因子以及水热耦合效应的土壤水分蒸发、肥料氨挥发动力学方程，以及施入土壤中的尿素转化为铵态氮的动力学型方程；为使水势—含水量关系式更好适应变温条件应用的要求，建立了含温度因子直接表征土壤持(来源：A9eBC7b4b论文网www.abclunwen.com)水曲线的经验方程，以及含温度因子的谷苗叶水势与土壤含水量关系经验方程。

The general 2-D FDFD equations in the Cartesian coordinate system and difference equations for the trapezoidal bevel edge of the waveguide are presented. Transmission characteristics of single and double trapezoidal-ridge waveguides are then analyzed using these equations.

采用直角坐标系中2-D FDFD的一般分析公式和波导梯形斜边上的差分公式，对梯形单脊矩形波导和梯形双脊矩形波导的传播特性进行了分析。

According to heat load source of die cavity, temperature distribution gradient equations and heat flux equations and the peak value equations of temperature load at die cavity surface have been obtained with research of temperature distribution and transfer laws of die surface by unsteady heat transfer theory.

摘要根据锻模型腔热负荷来源，通过非稳态传热理论，分析研究了模具工作表面层的温度分布与传递规律，给出了型腔表面温度分布梯度和热流密度公式，并给出了锻模型腔表面的温度负荷峰值的计算公式。

According to heat load source of die cavity, temperature distribution gradient equations and heat flux equations and the peak value equations of temperature load at die cavity surface have been obtained with research of temperature distribution and transf

摘要根据锻模型腔热负荷来源，通过非稳态传热理论，分析研究了模具工作表面层的温度分布与传递规律，给出了型腔表面温度分布梯度和热流密度公式，并给出了锻模型腔表面的温度负荷峰值的计算公式。

According to heat load source of die cavity, temperature distribution gradient equations and heat flux equations and the peak value equations of temperature load at die cavity surface have been obtained with research of temperature distribution and transfer laws of die surface by unsteady heat transfer theory.

新闻摘要：根据锻模型腔热负荷来源，通过非稳态传热理论，分析研究了模具工作表面层的温度分布与传递规律，给出了型腔表面温度分布梯度和热流密度公式，并给出了锻模型腔表面的温度负荷峰值的计算公式。

The calculation mechanics model is used for the curtain wall decussate rope net structure, including m horizontal ropes and n vertical ropes. The balance and displacement equations, alse the potential energy and kinetic energy equations, are constituted for the points with distributive loads and tensile force after the rope net distortion. Using the theory of finite analysis method, these groups of the n horizontal ropes' 2m+5 and m vertical ropes' 2n+5 equations are founded and the numerical solution is calculated.

建立幕墙由m根横向索、n根竖向索组成的正交索网结构的计算力学模型，在网点分配荷载及预张力作用下，列出钢索变形后的平衡方程、位移方程和弹性变形位能与外力作功方程，用有限分析方法将竖向索包含n个由2m+5变元组成的非线性方程组，将横向索包含m个由2n+5变元组成的非线性方程组寻求数值解。

Only with such characteristics, the movement equations can be expressed as matrices, and the idea of transforming the movement equations to the simplest form through a nonlinear transformation can be realized;(2) The form of Zi =Yi + YTH2i Y + Y7H3i Y(2)+ Y(2)T H4i Y(2)+ YTH5i Y(3) is adhibited in the nonlinear transformation, so that the multivalued problem caused by the nonlinear transformation is avoided, and the higher order transformation can be taken next;(3) The fourth order nonlinear transformation matrices H21,H31,H41 and H51 are derived, by which the original movement equations of electric power system is transformed to Jodan form in Z space;(4) By use of the fourth order nonlinear transformation, the approximate expression of the stability boundary is obtained, in Z space it is Z1= 0,in Y space it is Y1 + YTH21 Y + YTH31 Y(2)-i- Y(2) TH41 Y(2)+YTH51 Y(3)= 0;(5) The criterion used in this paper to judge whether the system critical unstable is simple and quick;(6) The method used in this paper is a direct method, and no need to construct an energy function.

正是由 于电力系统的运动方程具有这样的特性，才能写成矩阵的形式，通过非线性变换将电力系统的运动方程变换为最简单的线性形式的思想才能得以实现；（2）将通常运用于电力系统暂态稳定性分析的Normal Form变换的形式由 Yi＝ Zi＋ ZTh2riZ变形为 Zi＝ Yi＋YTH2iY＋YTH3iY（2）＋Y（2）TH4iY（2）＋YTH5iY（3），从而使得在对持续故障轨线实施同样的非线性变换以确定临界切除时间时，避免了非线性变换带来的多值性的问题，而只有在没有多值性问题的困扰下，才能采用较高阶的变换：（3）推导出了将原始电力系统系统的运动方程变换到Z空间的约当形式的非线性变换矩阵H21、H31、H41、HS1：（4）在运用四阶了「线性变换的情况下，给出了受扰动后系统的稳定边界的近似的解析表达，在Z空间为Z1=0，在y空间为： Y1+YTH21Y+YTH31Y(2)+Y(2)TH41Y(2)+YTH51Y(3)=0 （5）确定临界失稳的判据简单、快捷：对于一个复杂的电力系统，其稳定边界是相当复杂的一个高维曲面，即便是已知系统稳定边界的解析表达，要求出系统持续故障轨线何时与这一高维曲面相交，在数学上几乎是不可能实现的。

The experiments were carried out to calibrate FDR in the lab and field, and calibration equations were verified by oven-dried method for soil samples obtained by augers. The result showed that good calibrating equations with average RMSE 0.023 m^3/m^3 were fitted in the lab, but they had poor RMSE 0.066 m^3/m^3 when used in the field. Other calibrating equations with average RMSE 0.026 m^3/m^3 were also fitted by indirect field calibration method, and they had good RMSE 0.026 m^3/m^3 when used in the field.

结果表明，室内试验获得了较好的模型参数，均方根误差平均达到了0.023 立方公尺/立方公尺，但是应用到田间条件下误差很大，均方根误差平均为0.066立方公尺/立方公尺；田间条件下也间接获得了较好的模型参数，均方根误差的平均值为0.026立方公尺/立方公尺，应用于田间时测定含水量的精确度较高，均方根误差的平均值为0.026立方公尺/立方公尺。

Sodium citrate; calcium carbonate; calcium hydroxide; potassium bicorbonate; magnesium carbonate; ferrous sulphate; Zinc sulphate; copper sulphate; manganese sulphate; potassium iodide; sodium selenite.

柠檬酸钠；碳酸钙；氢氧化钙；碳酸氢钾；碳酸镁；硫酸亚铁；硫酸锌；硫酸铜；硫酸锰；碘化钾；亚硒酸钠。

All this to say that I'm glad filmmaking hasn't become completely ironic. I can enjoy an ironic film as much as the next person, but they usually involve a message of some sort. One that's delivered in a smirkingly clever way that requires little in the way of talent.

所有这些都是说，我很高兴电影制作没有变成完全讽刺艺术，我可以和下一个人一样享受讽刺电影的乐趣，虽然他们经常会被划归到一定级别，技术方面不需要很高的才能。