有限模型

The reflection of plane Rayleigh waves from a single microcrack was modeled by FDM and provided an accurate estimation of crack depth.

有限差分法以某个单一的微裂纹为模型，产生平面瑞利波的反射，同时提供一个准确的裂纹深度的估计值。

Productivity equation of natural gas well is established.

建立气井产能方程，初步确定火山岩气藏气井产量和无阻流量差异较大，气藏模型类型复杂多样，储层平面分布范围有限，多数压裂井附近存在不流动边界，因此，单井合理配产和控制边底水采出是高效开发徐深气田的重要手段。

Then based on the results, the characteristics of radar stealth of a naval vessel were analyzed.

建立以某舰船为参照的艏向与正横向的近似二维模型，基于二维时域有限差分法计算舰船的艏向与正横向在不同频率入射波情况下的雷达散射截面，并根据计算结果对某舰船的雷达隐身特性进行分析。

The technique of Support Vector Machine is applied and the model of predicting the vulnerability of naval vessel after shock is established according to limited training samples.

它采用支持向量机技术，根据有限的学习样本建立了预测舰艇在冲击荷载作用下生命力的计算模型。

By constructing a job-schedule network that can present job-time relationship,the FJSP is transformed to a network flow problem,and a 0-1 integer programming mathematical model is developed.

针对一般形式的固定工件排序问题(即可用机器数是有限的，存在机器与工件间匹配约束，以机器分配成本最小为优化目标)，作者通过建立描述工件间时序关系的工件时序网络，将固定工件的排序问题转化为沿工件时序网络的网络流问题，并建立了0-1整数规划数学模型。

A theoretical model of finite element/neural network hybrid stiffness matrix is presented in the project.

建立了有限单元/神经网络混合刚度矩阵的理论模型。

It is concluded that with the formation of PEG modified network, a larger matrix deformation and higher crack propagation energy can be achieved.

在"半互穿网络"的增韧模型中，聚乙二醇的加入增加了不饱和聚酯的自由体积，在体系受冲击时提高某些链段的活动能力；但这种网络抵抗外力的变形能力有限的。

A true CEI requires at least the following elements:(1) minimal regulation of private schools,(2) unbiased, low formal entry barriers,(3) opportunity to specialize,(4) low informal entry barriers,(5) nondiscrimination in funding,(6) minimal uncertainty about the scope of the market,(7) no price controls, and (8) a minimal number of informed and mobile customers.

不幸的是，这些改革没有囊括竞争性教育产业的全部关键性要素，因而，其范围太有限，对其管制太严格，不能成为真正的市场模型。

Based on the axial symmetric N-S equation of compressible liquid, we establish the onflow model to simulate convergent nozzles' free jet with different internal parameters by using structural grid and finite volume of quadratic precision.

建立了会聚型喷嘴的湍流模型，根据可压缩流体轴对称N－S方程，采用结构网格和二阶精度的有限体积法，对不同内部形状参数的会聚型喷嘴自由射流进行了数值模拟。

Combined with the feature of radar interference in modern naval combat, the model about radar interference resource distribution of warship is established with the theory of multi-objective fuzzy optimum dynamic programming .

针对现代海战中需干扰的敌目标雷达多而我方雷达干扰资源有限的特点，运用多目标模糊优选动态规划理论建立了舰艇雷达干扰资源分配的数学模型。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。