数学模型

This paper introduces a time series model whose determined trend is polynomial and errors are autocorrelated and heteroscedastic as sunspot series model.

用确定性趋势与残差服从条件异方差模型的自回归模型组合，作为太阳黑子相对数的数学模型。

The innovative point of this paper is the marketing personnel assessing model for primary election.

本文的阶段性成果是营销人员胜任力模型的建立，最终成果是素质测评数学模型的构建，创新之处在于尝试性的提出了基于胜任特征的营销人员素质测评模型，并采用测评表的方式将结果表示得更为直观。

Research on the theory of structure light sensor Originating from the principles of projective and perspective transformation, for the first time, the models of coordinate transformation between workpiece and camera with arbitrary angle of laser light and camera are presented. The model give some very important rules for the design of structure light sensor, and is very important to the design of structure light sensor, the sensor designed based on the theory above is used in automatic welding.

结构光传感器的理论研究依据透视变换理论给出了光源倾斜照射和摄象机倾斜接收情况下，被检测物体与摄象机之间的一般坐标变换数学模型，该模型揭示出结构光传感器设计时应遵循的一些原则，对结构光传感器的设计具有非常重要的指导意义，基于该模型设计的结构光传感器已在自动焊接实验中获得了成功的应用。

The mathematical model, the simulation model and control model of marine refrigeratory system of 5440TEU container ship are established based on the MATLAB Simulink integrated modeling and simulation environment.

基于MATLAB的Simulink集成建模与仿真环境，针对5440TEU的集装箱船的船舶冷库系统建立了压缩机数学模型、仿真模型及控制模型。

The fluid flow process in the model was analyzed,and the mathematical models for solving capillary pressure and relative permeability were set up.

分析了流体在模型中的流动过程，建立了求解毛细管压力和相对渗透率的数学模型，对模型进行求解后得到了与理论相符的结果。

At first, on the basis of the combination research methods of analytical theory, numerical simulation and experiment, the mathematical and physical model of certain-length rolling process have been established. Then according to the established model, the menstruation of rolling average friction coefficient is proposed; and then the certain-length rolling process and key parameters are determined.

采用理论研究、数值模拟和实验研究相结合的研究方法，建立定长轧制物理模型和数学模型；基于所建模型，提出了一种测定轧制平均摩擦系数的方法；确定了定长轧制工艺方法和关键参数；分析了影响制件轧制长度的因素；对关键参数进行了数值模拟。

The description of network delays including characteristics and effects are also covered and the uniformed mathematic models for NCSs with four different structures are derived. Furthermore, the controller basing on state prediction and compensating time delay is designed. Sufficient and necessary stability conditions for systems with different transmission policies such as perfect transmissions, delayed transmissions and time-varying transmissions are obtained as simple eigenvalue tests of certain test matrices. And in the end, effects of model error over maximum communication interval are analyzed. Numerical examples show the feasibility and efficiency of the proposed methods.

首先介绍了网络控制系统中数据包的传输情况以及基于模型结构方法的基本思想，并针对四种不同拓扑结构的控制网络分析了网络时延的性能，进而给出了统一的数学模型；然后，提出了基于状态预测的具有时延补偿功能的状态反馈控制器的设计方法，并针对完美传输、延时传输及时变传输三种数据传输策略，分别研究了控制系统的稳定性问题；最后分析了模型误差对最大通讯间隔的影响；仿真结果表明了设计及控制方法的正确性和有效性。

Mathematic model of the refrigeration system is presented with applying the distributed parameters method. In the models of condenser and evaporator, the flow patterns and its effects on the heat transfer coefficients of refrigerant side are considered.

采用分布参数的方法建立了制冷系统的数学模型，在建立冷凝器和蒸发器两相区模型时采用了分相流模型，并考虑了流型变化对制冷剂流动换热过程的影响。

Accident tree analysis is applied to risk analysis and a mathematical model is established, including fire model, effective release rate model, heat intensity threshold and hazard area equation.

采用事件树分析法进行风险分析并建立了数学模型，包括火灾模型、有效释放率模型、热强度极限值、危险区域等式四部分。

The analysis and simulation of dynamic/static performance of the HHCS shows that it is a large inertial system, and that there are such adverse factors in HCS and its model test system as nonlinear, dead zone, time variable parameters e.

最后根据所建立的数学模型和提出的仿真建模方法，论文建立了重载升沉补偿系统的静态特性仿真模型，建立了重载升沉补偿系统及其模拟试验系统、中载升沉补偿模拟试验系统、轻载升沉补偿模拟试验系统的升沉补偿的仿真模型。

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％。