锥管件无模拉伸数学模型的研究

此文分析了锥形管件无模拉伸的变形机制,提出了锥管形件无模拉伸速度、冷热源移动速度的变化规律,对锥形管壁厚的变化也提出了相应的数学模型,并通过实验研究证明,本文提出的速度模型,较好地表达了锥形管件无模拉伸冷热源速度变化的规律.     

酸雨对汉白玉的危害研究

采用模拟的方法研究了酸雨对天然汉白玉危害，研究结果表明，酸雨对汉白玉石材的危害主要是溶解腐蚀。根据数量统计获得了影氧化钙损失的因素和腐蚀速率“ｂ”以及腐蚀的规律。     

上海金桥出口加工区引进CGS的优化评价

以燃煤锅炉集中供热的上海金桥出口加工区引进天然气热电联供系统（CGS）为例，对其成本和效率作了评价。开发了1个最优化模型，它由季节小时平均热电供需平衡的制约条件和CGS设备容量的目标函数所组成。利用该模型能够在燃料价格和CGS投资费用变化的情况下，便捷地评价最佳的设备容量。引进CGS使氧化硫和二氧化碳排放降低，本模型也能对此作定量评估。     

Fuzzy数学在人－机－环境系统工程研究中的应用

综述了模糊数学在航天人机环境系统工程中的应用和发展。内容包括急性缺氧反应综合评定，人机系统中的控制模型，通风服研制和鉴定以及人体。心脏功能评价等研究领域中模糊数学的应用方法和作用。其研究方法对于一般人机工程的建模和分析具有积极意义。     

火灾定量预测方法研究

应用预测学原理，对火灾定量预测方法进行了探讨，建立了一套适应不同火灾历史统计特点的平滑预测模型：滑动平均预测模型和指数平滑预测模型；考虑火灾事故的季节性变化，建立了季节性平滑预测模型。应用二重指数平滑预测模型和季节性平滑预测模型，对荆州地区１９９３￣１９９４年的火灾统计资料进行分析和预测，结果表明该地区今后的火灾发生呈上升趋势，提请有关部门注意防火安全。     

An evaluation of the impact of persistent water level changes on the areal extent of Georgian Bay/North Channel marshlands

A conceptual mathematical model has recently been devised to assist environmental managers in predicting the impact on coastal marsh areas of long-term changes in water levels. The model considers such impact solely in terms of the geometry of the confining basin, the change in ambient water level, and the maximum depth for which bottom-rooted emergent vegetation is present. This model is applied to 17 shoreline marshes of various shapes in the Georgian Bay/North Channel region of the Great Lakes.Model outputs of predicted maximum and minimum marsh area subsequent to changes in long-term levels are compared to marsh areas measured from available historical air photos dating from 1935 to 1985. The results of such comparisons indicate that such a geometric model, despite its neglect of the biological complexities of marsh ecology, can serve as a valuable tool for assessing the range of impacts of both natural and man-made changes in long-term ambient water levels on shoreline marshes.     

Nonideal transport of reactive contaminants in heterogeneous porous media: 7. distributed-domain model incorporating immiscible-liquid dissolution and rate-limited sorption/desorption

The purpose of this work is to present a distributed-domain mathematical model incorporating the primary mass-transfer processes that mediate the transport of immiscible organic liquid constituents in water-saturated, locally heterogeneous porous media. Specifically, the impact of grain/pore-scale heterogeneity on immiscible-liquid dissolution and sorption/desorption is represented in the model by describing the system as comprising a continuous distribution of mass-transfer domains. With this conceptualization, the distributions of the initial dissolution rate coefficient and the sorption/desorption rate coefficient are represented as probability density functions. Several sets of numerical experiments are conducted to examine the effects of heterogeneous dissolution and sorption/desorption on contaminant transport and elution. Four scenarios with different combinations of uniform/heterogeneous rate-limited dissolution and uniform/heterogeneous rate-limited sorption/desorption are evaluated. The results show that both heterogeneous rate-limited sorption/desorption and heterogeneous rate-limited dissolution can significantly increase the time or pore volumes required to elute immiscible-liquid constituents from a contaminated porous medium. However, sorption/desorption has minimal influence on elution behavior until essentially all of the immiscible liquid has been removed. For typical immiscible-liquid constituents that have relatively low sorption, the asymptotic elution tailing produced by heterogeneous rate-limited sorption/desorption begins at effluent concentrations that are several orders of magnitude below the initial steady-state concentrations associated with dissolution of the immiscible liquid. Conversely, the enhanced elution tailing associated with heterogeneous rate-limited dissolution begins at concentrations that are approximately one-tenth of the initial steady-state concentrations. Hence, dissolution may generally control elution behavior of immiscible-liquid constituents in cases wherein grain/pore-scale heterogeneity significantly influences both dissolution and sorption/desorption.     

矿化垃圾柱吸附能力预测模型

建立数学模型对矿化垃圾柱的吸附能力进行理论预测。通过改变模型参数得到矿化垃圾柱的不同吸附穿透曲线，分析穿透曲线的变化规律，判定参数的优劣，确定垃圾柱吸附运行最优工况。为矿化垃圾柱的设计提供一定的理论依据。     

NUMERICAL MODELING OF THERMAL STRATIFICATION IN A RESERVOIR WITH LARGE DISCHARGE-TO-VOLUME RATIO1

ABSTRACT: A numerical model study of thermal stratification in a high discharge-to-volume reservoir is described. Predicted temperature profiles are compared with field data for two different years. The model accurately predicts the date of fall turnover, and predicts degree of stratification and depth of the thermocline within about 20% for both years simulated. A parametric study of stratification mechanics for a high flow reservoir indicated that diffusion was the predominant heat transport mechanism in the hypolimnion, while surface effects dominated the epilimnion. Flow effects for the particular case studied, in which all inflows and outflows occur in the epilimnion, did not significantly affect stratification behavior.