形式模型

A class of piecewise smooth maps with two border and three zones is derived to describe the dynamics of a current-programmed Buck converter operating in a discontinuous mode.

本文以不连续导通模式下的电流反馈型Buck变换器为例，推导出两个边界三段形式的分段光滑系统的离散映射模型。

Therefore,through the Geodatabase data model quoted by ArcGIS,the authors discussed the pipeline data organization and presented the system frameworks according to different requirements of application.The whole system design and function realization are accomplished by the combination of B/S and C/S architecture,which solved the problems such as management,application and dynamic ruled data-update of underground pipelines information.Meanwhile,the referenced scheme and basic idea for system construction of underground pipelines are provided in the paper.

为此，利用ArcGIS引入的Geodatabase数据模型，探讨数据的组织形式，根据不同的应用需求提出系统的框架结构，采用B/S和C/S架构相结合方式进行系统总体设计和功能实现，解决了地下管线信息管理、应用和法规保证的动态更新等问题，为城市地下管线的系统建设提供了借鉴方案和基本思路。

Long-term potentiation is an important form of synaptic plasticity and a cellular model for study of learning and memory.

长时程增强是突触传递功能可塑性的重要表现形式，是研究学习与记忆的细胞模型。

For the sake of enhancing the efficiency of gas inlet and outlet, the mathematical model that takes the plentitude coefficient as the target function may be established. In addition, based on the working characteristics of cam mechanism, the surface wear is its main failure mode; the second target function can be accordingly established.

为获得高的进排气效率，可建立以丰满系数为目标函数的数学模型；另外，基于凸轮机构的工作特点，表面磨损是它的主要失效形式，可依此建立第二目标函数。

Governing equations of a modified k -ε model is derived in a three-dimensional cylindrical polar coordinate system, and an available equation is produced.

首先给出单相螺旋流流场在三维圆柱坐标下的修正κ-ε湍流模型的控制方程，得出控制方程组的通用形式。

The calculations of nucleus-nucleus potential are carried out in the framework of double folding model with M3Y-Reid and M3Y-Paris effective nucleon-nucleon interactions. The exchange part of the interaction, which is taken to be of finite range and the density dependence of NN interaction, is accounted for in the folding procedure. The results are used as the real part of the optical potential for heavy ion scattering.

用双折叠模型计算了核核碰撞的相互作用势，其中核子-核子相互作用势采用M3Y-Reid和M3Y-Paris形式，交换部分考虑了有限力程的密度依赖的核子-核子相互作用，程序用于重离子散射光学势实部的计算。

The classical logistic equation is generalized to a new model with power exponent to the rate of growth of the population.

本作品将经典的逻辑斯蒂人口增长模型改进为具有幂律型增长因子的更一般形式，使其能够更加适用于现实中复杂的人口增长问题，并选用相应适用的幂律指数数值进行了对我国大陆，部分省区、直辖市及县区的人口分布规律的实证。

After introduced the modality of the air pylon and loads on it, we create its statically indeterminate structure mathematic model according to theoretic analysis and rational predigestion.

介绍了飞机挂架的具体结构形式和受载状况，经过理论分析、合理简化，建立了挂架的超静定结构数学模型。

To represent by an image , a form , or a model or prefigure .

用形象，形式或模型来表示；或预示

To represent by an image , a form , or a model symbolize or prefigure .

象征用形象，形式或模型来；象征或预示

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。