查询词典 plaster model

After compairing the characters of logit model and probit model, this paper chooses logit model as the parking choice model.

接着在分析了logit模型和probit模型的优缺点后，决定选用logit模型作为停车场选择模型。

This modeling method is discussed from three aspects as follows. Firstly, on enterprise model framework, enterprise model expressed by this modeling method is more particular than other, since there are the views of product process and relation in it. Secondly, in this modeling method, the modeling process that the process model of products is created first of all and other models are created according as it is presented. Using this method, enterprise model is clear and consistent. Thirdly, on the representation of views, the traditional method of IDEF is appreciably improved.

论文从三个方面对此建模方法进行了阐述：1，企业模型框架方面，基于产品过程模型的集成化企业建模方法中的模型框架包含了产品过程视图和联系视图，因而它表达的企业模型更为丰富、详细；2，企业建模过程方面，提出了首先建立企业产品过程模型、再以此为核心建立其它模型的建模过程，这样建立的企业模型主次分明，各视图之间有机统一、协调一致：3，模型视图的描述方法方面，对传统的IDEFIntegrated Computer—Aided Manufacturing(ICAM DEFinition模型表达方法提出了一些改进建议。

Besides expressing design result, it provides domain constraint for design process and model information for digital assembly sequence planning and simulation of stamping die, which is usually ignored in the former product models. Taking the specific structure and design process of stamping die into account, the information of workpiece is composed in die product model as product feature. Former product models merely contain mainly about the die design result, this model extends the contents of product model with the relation feature of the composed subassembly and parts and also other associated production knowledge. It is convenient for getting the associated information during intelligentized design process.

该模型不但能完整地表达冲模的设计结果，同时还表达和存储了冲模设计的知识信息，能较好地为冲模的设计过程提供规则和约束，支持产品的智能设计过程以及冲模的数字化预装配规划和仿真；而模型中冲压件信息的集成则扩大了冲模产品模型的信息内涵和应用外延，便于建立冲模智能设计过程的信息关联，从而使集成信息模型成为产品设计过程上、下游活动实现信息共享的基础。

On the basis of above research works, a finite element model for column of the TH6350 high speed numerical control boring was built; the stiffness of the slide guide interface between the bed and column bottom and the constrain stiffness from lead screw were estimated by using experimental formula, to guarantee the rationality of the boundary condition of the FEM model; the week link of the column has been found by application of ANSYS software to FEM model analysis of the column, The result shows that the calculation data and test data are very consistent, therefore proved the properness of the FEM model.

在上述工作基础上，本文对TH6350高速数控镗床的立柱进行了有限元建模；并利用经验公式估算了立柱与床身之间的导轨结合面上的刚度和丝杠副约束刚度，保证了有限元模型的边界条件的合理性；应用ANSYS软件进行有限元模态分析找到了立柱结构的薄弱环节，通过分析对比表明有限元分析计算与现场测试的结果相一致，证明了有限元模型的正确性，为立柱结构的进一步改进设计和优化提供了重要参考依据。

The model of the received power is established based on the basic principles of geometry optics and radiometry. This model provides the principle of receiver-transmitter design and performance evaluation. On the basis of the received power model and APD noise model, the response of measurement signal after passed through the frequency difference circuit and the corresponding change of its SNR are studied.

研究了非合作目标测距时，发射视场与接收视场的重叠情况，以及视场重叠区域内光的探测情况，并以此为基础，根据几何光学和光度学的基本理论，建立了非合作目标测距中接收光功率的数学模型，为接收/发射器的结构设计，以及测距性能的预测提供了理论依据。

Meanwhile, the index futures hedge theory has also get a further development, which evolves from traditional hedge theory, the selectivity hedge theory and modern hedge theories. After analyzing the merits and shortcomings of the three theories, the paper mainly studies four minimum square hedge theory models, which are The traditional static OLS model, VECM model, one variable GARCH(1, 1) model and one variable GJR-GARCH(1, 1, 1) model. Established on September 8th in 2006, China Financial Futures Exchange initiated a new era of our country finance ramification-- index futures, opening a door for the China futures industry.

而股指期货的套期保值理论也随之得到长足发展，历经传统套期保值理论、选择性套期保值理论和现代套期保值理论，本文在分析三大理论优缺点的同时，着重研究现代套期保值理论即最小方差避险理论的四种模型：传统静态OLS模型、VECM模型、单变量GARCH(1，1)模型、单变量GJR—GARCH(1，1，1)模型。2006年9月8日，中国金融期货交易所的成立，掀开了我国金融衍生品种股指期货的新纪元，迎来了中国期货行业发展的机遇期。

As an often used physical model with good theoretical and practical values, StreeterPhelps model has been widely used to study water quality. However, in some special water areas the utilitization of StreeterPhelps model has some limitation as confirming reaeration coefficient often comes from tests in rivers with fast water flow speed with no consideration of wave effects. Furthermore, in practical research in Three Gorges Reservoir, the changing rule of COD appears abnormally. In some water areas far from pollution source, the value of COD changes with time, but does not follow the exponential attenuation rule. This phenomenon can not be explained by former modified StreeterPhelps model.

StreeterPhelps模型是目前进行河流水质研究常用的物理模型，具有良好的理论和实用价值，然而在某些特定水域，该模型的应用受到限制，主要原因是复氧系数的取定多在水流速度较大情况下得到的，而未考虑水面波动对复氧系数的影响，另外，在实际研究过程中发现三峡库区COD变化的规律出现异常：在离排污口相当远的水域，COD随时间变化趋势并不是指数衰减，而是在某个常值附近微小摆动，以往很多修正过的StreeterPhelps模型都无法解释这个现象。

Compared with the Mohr-Coulomb model, the new model 2 can describe the stain-harding and geometryharding characteristics of powder compaction. 5. Model verification. Using the new model, the simulation analysis was done on the powered metal compaction, the reliableness and application range of the new models were provided.

模型验证运用新模型对粉末压制过程进行仿真实验，验证了模型的可靠性，并给出了模型的适用条件：对高密度压坯成形的描述，新模型一具有足够的精度。

In light of the analysis of the traditional methods of model representation and model composite, a novel theory of model representation and model composite based on Agent technology was proposed.

在分析当前模型表示与模型复合方法的局限性基础上，结合Agent技术，提出了基于Agent的模型表示与模型复合理论。

Model structure is determined according to the principle of minimizing residual sum of squares, model parameters are estimated by optimum instrumental variable method and prediction error method and validation of the model is performed by examining the whiteness of model residuals.

采用最小二乘法估计制动器ARX模型的参数，以损失函数最小为优化准则，判断了制动器模型的阶次。运用最优辅助变量法和预报误差法，对制动器ARMAX模型的参数进行了估计。

Molecular Distillation is a kind of high vacuum distillation method, which is suitable for the separation of high boiling, heat sensitivity and viscidity products.

分子蒸馏技术是一种在高真空条件下进行的连续蒸馏过程，适合于分离高沸点、热敏性及具有生物活性的混合物。

They are to the Noughties what yuppies were to the Eighties .

那在六十年代是时髦的，但在八十年代肯定是过时了