甘肃省“蛛网模型”马铃薯供求关系的分析

为了使马铃薯产业的供求机制及其价格变动成为甘肃省农民增收、工业发展的重要信息导向源,运用“蛛网模型”对甘肃省1999-2008年期间马铃薯价格的变化作深入的分析。并通过“蛛网模型”价格信号反应,分析了甘肃省马铃薯市场“蛛网模型”变迁路径与诱导因素,从而“管中窥豹”式的观察马铃薯市场,以便采取措施,规避市场风险。     

Empirical Sudy on Loyalty Education Solution Model for Enterprise Employees

Loyalty is a good character that a person is loyal to his enterprise's goal,symbol and aim.The employee who has high loyalty is a very important basement to efficiency and competency to the development for the enterprises.The authors use ingredient analysis method to deal with the data collected from questionnaires done by 225 enterprise employees,and put forward Eight-factor model of loyalty education solution to enterprise employees.Based on this model,the study compares the differences of the eight factors to enterprise male and female employees and employees in both state-owned enterprise and privately owned enterprise,but also discovers the differences between the employees mentioned above.     

基于核心企业的食品供应链社会责任管理分析

从核心企业的角度探讨食品供应链社会责任管理问题。从层次模型概述了食品企业社会责任的内涵和食品供应链社会责任的特征,分析了核心企业在供应链管理中的中心地位。无论是从社会责任缺失原因,还是核心企业与供应商的关系,以及食品供应链的风险传导方面来看,核心企业与链上成员企业共同履行社会责任是提高整个链条企业社会责任水平的关键。从企业文化和信息共享的角度构建了以核心企业为中心的食品供应链企业社会责任约束传递机制,分析了核心企业在整个约束传递机制中的角色和行为。核心企业可以通过培养供应商积极履行社会责任的意识,减轻供应商履行社会责任的成本压力,强化对供应商的企业社会责任监督等措施使供应商参与到供应链社会责任管理中来,促进食品供应链的可持续发展。     

Design on Enterprise Informationization Estimates the Model of Composite Index

This peper commentaried some of our country comparatively well-known enterprise informationization estimate theory,point out,there is existing the question of informationization estimates,that the achievement can't guarantee "appropriate informationization" establishing and enterprise informationization sustainable development,It propose the three-dimensional enterprise informationization estimate the theory and method,that includes information-based level,information-based quality and information-based development potentiality.     

河岸带生态系统管理模型研究进展

（西南大学资源与环境学院,重庆数字农业重点实验室,重庆 400716）     

The Multi-view Concept Model and Operation Mode of Agile Virtual Enterprise

Agile virtual enterprise (AVE) is an important organization mode of 21 st century and an important method to response quickly to the changes of the market as well. Based on the analysis of the connotation of AVE and the differences between traditional enterprises and AVE, through a variety of views including function view, human/organization view, process/control view, information view, and resources view, the concept model of AVE is established. A variety of issues during the lifecycle of the AVE are also researched. The operation mode of the AVE and the questions that must be paid attention to are presented. This is helpful to understand and master the meaning and feathers of AVE, and to the practice of AVE in China, which will contribute to the improvement of compete ability of Chinese enterprises.     

Twist and Rotate Speed Measurement Oriented Virtual Instrument Based on Qin''s Model

The paper introduces concepts and the general idea of Intelligent Virtual Controls based on Qin's Model,and advances a new instrumental mode ,that is Virtual Intelligent Twist and Rotate Speed Measurer ,which can be used in measuring the frequently used physical parameters in the rotate mechanical systems ,including twist ,rotate speed ,power and the axes-oriented force. The three-layered hiberarchy ,including the interface layer ,the testing and service layer and the hardware driving layer, is brought forward to design the Virtual Intelligent Twist and Rotate Speed Measurer ,which is a new creative method .In the hiberarchy, the lower layers provide the service and support to the upper ones, and the upper layers realize the functions of instruments with call-back of the lower ones .In the framework the three ones divide the work and cooperate well. An Virtual Instrument based on IVC-based-VI is successfully developed which is used in the twist and rotate speed measurement of the mechanical area.     

基于非线性动力学的省辖市大学生村官竞争与互利模型研究

大学生村官的可持续发展逐步成为省辖市需要统筹协调的复杂系统。论文从非线性动力学角度建立省辖市大学生村官竞争与互利模型,定量探讨处于同一发展区域内的省辖市实施大学生村官计划的竞争与互利战略,并分析了系统平衡态的稳定性。结果表明,在竞争与互利的模式下,可以根据稳定性条件,对不同省辖市大学生村官计划进行分析比较后,估计判断大学生村官发展规模的均衡性与稳定性,并参考该条件对省辖市大学生村官发展模式进行适当的调整。     

基于Open L-System的植物生长模拟研究

为了真实地模拟植物生长发育过程,引入了Open L-System建模理论。在植物形态发生模型的基础上,根据植物生长时其形态特征及环境之间的相互作用,构建了综合考虑植物生长发育与环境影响的虚拟植物模型。     

基于作物模型的冬小麦气候适宜度算法研究

为了定量分析气象条件对作物生长的综合影响,利用WOFOST作物生长模型分析冬小麦各生育期的气候适宜度。通过对华北地区3个代表站点2007—2009年生长季的冬小麦进行生长模拟,并选取2007—2008年生长季的模拟结果作为标准,以其他年份同一生育期的生物量与标准的比值作为该生育期的气候适宜度,并与统计方法的结果进行对比。结果表明,用作物模型计算得到的适宜度与产量之间呈现出较好的正相关性,决定系数为0.603,且通过了0.05置信水平检验,可用该方法对冬小麦气候适宜度进行估算。     

VaR Model and Application to Securities Investment Management

VaR model is one of methods to measure and control market risk.This paper analyzes VaR model principle and its main factors.According to function relation,the relationship between the portfolio value and its market risk factors are sorted in two kinds: linear and nonlinear.The method of calculating the VaR is put forward.Finally,the article analyzes the application of VaR model to portfolio,risk control,information disclosure and financial supervison.     

基于投入产出模型的四川郫都传统农业轮作模式的可持续性评价

为了说明四川省郫都区轮作模式的可持续性,及其潜在的经济及环保价值。基于投入产出理论,对郫都区5种典型轮作种植模式构建价值投入产出表与投入产出系数表。通过传统轮作模式与现代连作模式的比较,以及传统模式之间的比较,直观地对郫都区现有的轮作模式进行可持续性分析和评价。结果表明,由于传统的轮作模式符合作物自然生长规律,对农药和化肥的依赖性远低于现代连作模式,并较好地保持了农作物的生物多样性,但其单位面积产出低于连作模式。对稻蒜、稻韭、稻菜、稻姜和稻萝5种传统的轮作模式进行投入产出分析发现,5种模式单个产品投入和产出占比几乎一致,说明郫都区这种水旱轮作模式是一个有机整体,统一而又协调。要使传统的轮作模式得以发扬与传承,郫都区应打好天府水源地有机绿色农产品品牌,政府在相关政策方面应予以相应的鼓励和支持。     

基于随机森林算法的日光温室内气温预测模型研究

开展日光温室气温预报,为农业生产提供参考,指导农户采取调控措施,为作物生长提供适宜条件,促进品质和产量提升。研究选取温室外气温、日照等气象因子,建立随机森林算法预测模型,就室内最低、最高气温进行拟合预测分析和预测因子重要性评估。结果表明,温室内最低、最高气温拟合值与观察值的拟合度分别达99.69%和99.85%,温室外最低气温是室内最低气温的重要预测因子,室外日照是室内最高气温的重要预测因子。同时建立支持向量机、神经网络、多元回归、逐步回归模型,通过对各个模型中平均绝对误差、均方根误差等3个指标进行比较,得出随机森林模型的预测精度优于其他模型。基于随机森林算法的气温预测模型精确度较高,可推广应用到后期日光温室气温预测中。     

基于AMMI模型的NCⅡ交配设计试验的配合力分析

AMMI模型是基因型与环境互作效应分析的有效工具, 而特殊配合力实际上也是父母本间的 互 作效应。 本文用该模型对NCⅡ交配设计试验的配合力进行分析, 结果表明可提高特殊配合 力估值的准确性。 实例分析结果表明, AMMI模型估计的特殊配合力效应值与传统分析方法 的结果在大小上有程度的差异, 但方向相同; 特殊配合力方     

Active Suspension Based on the MDOF Vehicle Model

Considering influence of factors such as seat and passengers, a MDOF(Multi Degree of Freedom)model for active suspension is employed. Based on the derived 8DOF model, a controller for this model is also designed by using LQ control theory. Furthermore the appropriate control scheme is selected by testing various performance indexes. The study shows that the satisfied results can be obtained using an appropriate vehicle model, even if the low order controller and the general control strategy are adopted.     

基于SWAT模型的梁滩河流域非点源污染负荷评价

为掌握梁滩河流域氮磷污染物的时空分布特征,基于空间和气象数据构建流域SWAT氮磷负荷模型,并利用监测数据对模型进行率定和验证,借助投影寻踪法综合评价各子流域的主要非点源污染来源。结果表明：模型在研究区具有较好适用性,流域氮磷排放主要集中在丰水期（5—9月）且占全年的76%,氮磷负荷主要来自于农药化肥且以总氮排放为主。从空间上看,流域中部地区以地表径流污染为主,而西部地区水土流失较为严重,且污染负荷与泥沙排放量密切相关。     

基于RAROC模型的农业银行信用风险管理研究

RAROC模型是国际商业银行用于经营管理的先进方法,将RAROC模型运用到农业银行信用风险研究中,首先介绍RAROC模型的含义及核心思想,然后详尽的测量RAROC模型中的基本参数,将实证研究得到的RAROC数值进行分析和比较,最后得出农业银行信用风险管理水平逐年提高,经营业绩突飞猛进,贷款稳步增长,贷款质量持续改善等结论。     

基于GIS的分布式侵蚀产沙模型及其空间尺度转换研究进展

地理信息系统（GIS）与模型的结合是分布式侵蚀产沙模型的发展方向,而模型的空间尺度转换是其研究的重要方面。笔者对国内外基于GIS的分布式侵蚀产沙模型及其空间尺度转换研究进行了全面综述,结合中国的实际研究情况,总结了目前研究存在的主要问题,最后提出了今后一定时期内中国基于GIS的分布式侵蚀产沙模型及其空间尺度转换研究的发展方向。