江苏省建筑业综合保证金研究

通过对江苏省建筑业各类保证金研究,发现在目前建筑业管理中存在的问题,探索建立新的管理模式,在过渡时期通过综合保证金来规范管理,减轻企业负担,促进建筑经济的发展.     

Quasi-maximum likelihood estimation of periodic GARCH and periodic ARMA-GARCH processes

Abstract.  This article establishes the strong consistency and asymptotic normality (CAN) of the quasi-maximum likelihood estimator (QMLE) for generalized autoregressive conditionally heteroscedastic (GARCH) and autoregressive moving-average (ARMA)-GARCH processes with periodically time-varying parameters. We first give a necessary and sufficient condition for the existence of a strictly periodically stationary solution of the periodic GARCH (PGARCH) equation. As a result, it is shown that the moment of some positive order of the PGARCH solution is finite, under which we prove the strong consistency and asymptotic normality of the QMLE for a PGARCH process without any condition on its moments and for a periodic ARMA-GARCH (PARMA-PGARCH) under mild conditions.     

Variation in larval sea lamprey demographics among Great Lakes tributaries: A mixed-effects model analysis of historical survey data

Understanding variation in fish populations is valuable from both a management and an ecological perspective. Great Lakes sea lampreys are controlled primarily by treating tributaries with lampricides that target the larval stage. Great Lakes streams were divided into four categories based on their regularity of parasitic lamprey production inferred from the historic regularity of chemical treatments. This categorization was intended to direct future assessment efforts, but may also reflect differences in early demographics. We analyzed assessment data collected from 1959 to 2005 using mixed-effects models and variance components analyses to test for differences in recruitment and growth to age 1 among stream categories. Recruitment was twice as large in regularly treated streams as in irregularly treated streams, indicating that age-1 year-class strength is correlated with consistent chemical treatments. We found no differences in length at age 1 among stream categories; however, Lake Superior streams with irregular treatment histories exhibit more variation in length at age 1 than streams that are treated regularly. The majority of variation in length at age 1 was due to within-year variation, which was fairly consistent across stream types within each lake. Our results indicate that early life history differs among subsets of the Great Lakes sea lamprey population, and management practices should be modified to account for these differences. Mixed-effects models and variance components analyses are useful tools for analyzing large historical datasets for patterns of demographic variation within and among populations, whether the ultimate goal is pest control, harvesting, or conservation.     

淮北平原旱涝综合治理优化模型

本文针对淮北平原水旱灾害交错发生的特点,研究流域旱涝综合治理优化模型。根据水资源大系统优化理论,建立了“分解-聚合”谱系递阶结构模型,对流域内沟、闸、井等工程设施的合理布局和规模进行优化,并为联合运用地表水和地下水提供优化控制方案。文中还以汾泉河流域为实例,采用“DDDP-BSDP”套用的优化方法进行求解,验证了所建优化模型及其解法的有效性。     

醌及氢化醌类化合物对麦草蒸煮的作用及其数学模型

本文研究了蒽醌（AQ）及其衍生物以及氢化蒽醌对麦草烧碱法蒸煮的作用，用微型计算机处理蒸煮结果，得到7个关于添加剂用量与蒸煮效果关系的数学模型，并对蒸煮过程进行了分析。研究结果表明，氢化蒽醌是比较适合麦草制浆的蒸煮添加剂。     

基于公钥密码体制的数字签名技术

介绍了公钥密码体制的概念，分析了两种常用的基于离散对数的公钥体制，介绍了数字签名的概念和应用并提出了几种实用的数字签名方案。     

模糊评定的通用计算机方法

本文介绍了应用模糊数学工具，对难以定量化的模糊对象，进行数字化的一种通用的计算机方法，并在生丝等级评定方面的应用作了具体分析。     

小型压缩机制冷量测试平衡过程模型化及解耦分析

本文通过对制冷系统动态特性数学描述的研究,对制冷量测试系统平衡过程进行了模型化,并把模型的仿真结果与试验结果作了比较,证明了模型的正确性,在上述基础上,运用Bristol-shinskey方法,对系统的耦合情况作了定量研究,并把一个四变量耦合系统简化成二变量耦合系统。本文研究所得出的结论为计算机自动控制制冷量测试系统的研制作了理论上的准备。     

三峡工程青岩子河段平面二维河床变形初步计算

本文应用平面二维泥沙数学模型对三峡工程青岩子河段建库后的河床冲淤变化进行了初步计算。结果表明:数值计算结果与实物模型试验结果基本一致。     

铝硅合金流变模型及应力－应变本构关系的研究

通过Ａｌ－Ｓｉ合金准固态流变性能的测试，建立了该合金准固态流变模型，并推导了轴对称铝硅合金铸件凝固过程应力－应变本构方程，为开展铸件凝固过程热应力数值模拟和热裂预测提供了可靠的理论依据。