基于遗传算法的交通量平衡分配预测

本文介绍了现有交通分配模型,并分析了现有模型的局限性,提出了基于遗传算法的交通量平衡分配预测模型,并给出了算例对所提模型进行了验证。     

基于利润最大化的直营连锁企业供销平衡经营策略

建立一个多目标供销平衡经营策略鲁棒等价模型,用近似等价优化模型求解,随后提出直营连锁企业的单周期产品的利润与损失平衡的供销经营策略模型。数值分析结果表明,这种平衡经营策略是有效的,可以达到利润最大且损失最小的平衡目的,通过调节市场总量、供销权值和处理价等策略,有效地平衡产品损失和收益值,为解决直营连锁企业单周期产品的供销平衡经营策略问题提供了一种新的方法。     

肺部感染初始先天系统反应的动态模型的稳定性

考虑肺部感染初始先天系统反应的动态模型，获得了模型没有正平衡点的条件以及在该条件下模型边界平衡点的稳定性，最后利用Matlab软件包对所获得的理论结果进行了数值验证.     

功能性反应模型中心问题的研究

对食饵－捕食者种群在非密度制约的条件下，两种群具有线性收获率的ＨｏｌｌｉｎｇⅢ类功能性反应模型进行了定性分析。用分枝理论研究了子模型平衡点的中心问题。     

絮凝过程的群体平衡模型研究进展

回顾了群体平衡模型(Population Balance Model,PBM)应用于絮凝过程中絮体粒经分布模型的相关研究,主要包括区间离散法求解PBM,絮体聚并模型和破碎模型等。近年来,描述聚并效率的"曲线模型",与Kol-mogorov尺度相关的破碎频率模型,絮体的分形特征等方面得到了较大的进展。但絮凝过程动力学的研究还并不完善,絮体粒径的动力学演变过程还需要更多的研究。未来的研究应集中于:(1)更多的实验验证,尤其是絮体破碎行为的测定;(2)结合絮凝机理,提出更有效的絮体聚并、破碎模型;(3)更合理的流体剪切力描述。     

功能性反应模型中心问题的研究

对食饵—捕食者种群在非密度制约的条件下，两种群具有线性收获（存放）率的ＨｏｌｉｎｇⅢ类功能性反应模型进行了定性分析。用分枝理论研究了模型平衡点的中心问题     

一维晶格模型的铁磁隧道结特性

对一维晶格模型的铁磁/绝缘体/铁磁（FM/I/FM）隧道结中的平衡自旋流（ESC）进行了理论研究.利用非平衡格林函数,得到了ESC的严格表达式.分析得出,ESC起源于铁磁磁化的交换耦合,对电子器件的制造起着重要的指导作用.     

城市交通连续平衡网络设计问题的求解算法

文章针对采用二层规划模型描述的固定需求条件下的连续平衡网络设计问题,给出了一种基于间隙函数的求解算法。同时给出了一个简单的算例来说明该算法的可行性。     

热力学方法是如何处理平衡问题的

介绍了状态函数法、演绎法、概念突破法和理想模型法四种热力学常用的方法，并结合实例说明它们在化学、化工中的应用     

记忆粒子模型中碰撞比α_n的数值获取

本文给出了记忆粒子模型中n态时m粒子的碰撞比分α_n的数值获取方法;讨论了两种不同的初值赋值方法对结果的影响。在记忆粒子模型中采用本方法提供的α_n,计算预平衡发射与实验资料拟合良好。     

工程建筑物变形监测数据预测分析

在概述灰色Verhuslt模型基础上,对灰色Verhuslt模型在建筑物沉降监测中的应用做了详细介绍.结合工程实例中4#楼东南角S044点沉降数据建立灰色Verhuslt模型,实证结果表明模型精度可靠,实际沉降量观测值与沉降量预测值吻合较好,在沉降变形分析数据预测分析中应用灰色Verhuslt模型具有可行性.     

基于GA-BP网络的铁水硅质量分数预测系统

提出将BP神经网络与遗传算法(GA)相结合,建立了三层GA-BP神经网络模型,模型利用遗传算法来修改网络的连接权值,构筑进化型的神经网络模型,缩短网络学习训练时间,提高模型预测精度。炉温预测主要是高炉铁水硅质量分数的预测,当要求硅质量分数预报的绝对误差为±0.05%时,命中率为90%。结果表明,GA-BP网络模型比传统的BP网络模型能够获得更高的精度。     

认知模型研究的新成果及应用

综述认知模型研究近年来取得的成果及应用。研究了粒计算认知模型、动态信任预测认知模型、Bayes信任预测认知模型采用的主要算法,介绍了认知模型在求解认知难题、虚拟人决策训练、多Agent谈判中的应用。指出粒计算认知模型、动态信任预测认知模型、Bayes信任预测认知模型是近年来认知模型的主要研究成果。因此,认知模型的研究具有很高的应用价值。     

物理模型及其应用

对物理模型的概念作了介绍 ,阐述了物理模型的类型、特性和功用 ,给出了双层玻璃减少热量模型的建立过程 ,以两个实例说明了物理模型在解题和解决实际问题中的重要作用 ,深刻地分析了问题的结论对模型类型的依赖性 .     

灰色回归模型在农业用水量预测中的应用

在分析灰色模型与回归模型特点基础上提出了灰色回归模型,并以最小二乘法确定了两单一模型权重系数的分配。结果表明：灰色回归预测模型在最大、最小误差及平均误差这三项指标中明显优于两单一模型。因此,灰色回归模型能显著提高预测精度,可作为农业用水量预测的一种有效工具。     

Simplification and Experimental Verification for Temperature and Humidity Field Coupling Model of Conservatory Soil

Based on the surface energy balance model which is widely used abroad, a temperature and humidity field coupling model of conservatory soil without crop vegetation in full illumination was established. Considering the relatively closed environment in conservatory, weak solar radiation and little surface evaporation of soil, the daily variation of water content in different soil layers may be neglected, then the temperature and humidity field coupling model was simplified to a one-dimensional thermal diffusion model. The simplified model and the temperature and humidity field coupling model adopted the same computational method of soil physical parameters and discrete format of heat diffusion differential equations, and were applied to the continuous simulation of temperature field in conservatory soil without crop vegetation in full illumination. Through the comparison between simulation results and experimental data, the precision of the simplified model was verified. The typical rule of soil heat flux variation in a 24 h cycle was also obtained.     

Voices Along the Journey: Midwives' Perceptions of Implementing the CenteringPregnancy Model of Prenatal Care

The purpose of this study was to describe the reported perceptions of six midwife participants at different stages of their engagement in a multiphase process of adopting a new model of prenatal care. Midwives were interviewed at five different stages during the process of implementing CenteringPregnancy, a model of group prenatal care. The research methodology used in this study was phenomenology. The conceptual framework for exploring the participants' perceptions was based on the Institute for Healthcare Improvement's patient-centered model and on the International Institute for Restorative Practices' empowerment model. The five themes that emerged from the midwives' experiences mirrored the stages of change health education model. Suggestions for the implementation and sustainability of the CenteringPregnancy model of care are provided based on the five themes that emerged from this study's findings.     

Three-Dimensional Shaking Table Test of 1/10 Scale Model of Reinforced Concrete Frame Structure

1 IntroductionThe criterion and rellablllty of the st~turalaselsmlc design depends mainly on the acknowledgement about the seismic response and the damagemechanism of the structure Generally, there are threeapproaches through which the stfUctural aselsmlccapabllltles is studied The first is the Investigation ofthe real earthquake disaster, the second isexperimental research, the third is academic analysisThe practical aselsmlc capabllltles and the behaviorof damage can be found out through th…     

Integration of USEPA WASP model in a GIS platform

The integration of water quality analysis simulation program （WASP） with a geographical information system （GIS） is presented.This integration was undertaken to enhance the data analysis and management ability of the widely used water quality model.Different types of data involved in WASP modeling were converted and integrated into GIS using a database method.The spatial data modeling and analysis capability of GIS were used in the operation of the model.The WASP water quality model was coupled with the environmental fluid dynamics code （EFDC） hydrodynamic model.A case study of the Lower Charles River Basin （Massachusetts,USA） water quality model system was conducted to demonstrate the integration process.The results showed that high efficiency of the data process and powerful function of data analysis could be achieved in the integrated model,which would significantly improve the application of WASP model in water quality management.     

The Nottingham Apprenticeship Model: Schools in partnership with artists and creative practitioners

This article documents the collaborative research and development of an apprenticeship model of learning for the arts. It focuses on teachers working in partnership with artists and other creative practitioners. The model is rooted in theories of social learning and cognitive apprenticeship. It was developed and tested through collaborative research, some of it action research. The aim was to explore and test the model for appropriateness and for its impact on the learning of all participants (children, teachers, creative practitioners). The model was found to be useful as a guide to the organisation of children's learning in the arts. Moreover, using the model had a positive effect on the inclusion of children on the margins into wider school learning. The model was also useful in facilitating the professional development of the adults concerned: teachers, artists and others.