单井滴灌干管管网的优化设计

为解决单井运行滴灌干管管网的优化设计问题，提出了干管管网优化设计的数学模型，并采用动态规划法对该问题进行求解。所提出的方法，不仅能得出一个优化的干管管网，而且还能确定出所需水泵扬程及流量，并确定水泵型号。     

Locating and protecting critical reserve sites to minimize expected and worst-case losses

There has been much recent interest in the development of systematic reserve selection methods that are capable of incorporating uncertainty associated with site destruction. This paper makes a contribution to this line of research by presenting two different optimization models for minimizing species losses within a planning region. Given limited acquisition budgets, the first minimizes expected species losses over all possible site loss patterns outside the reserve network while the second minimizes maximum species losses following the worst-case loss of a restricted subset of nonreserve sites. By incorporating the uncertainty of site destruction directly into the decision planning process, these models allow a conservation planner to take a less defensive and more strategic view of reserve selection that seeks to minimize species losses through the targeted acquisition of high-value/high-risk sites. We compare both of these methods to a more standard approach, which simply maximizes within reserve representation without regard for the varied level of threat faced by different sites and species. Results on a realistic dataset show that significant reductions in species losses can be achieved using either of these more intelligent modeling frameworks.     

目标规划在国营林业局生产管理中的应用

本文采用目标规划的数学方法,针对林业生产经济效益、生态效益和社会效益的综合要求,本着以林为主多种经营、森林资源永续利用的原则,建立了国营林业局生产管理系统的规划模型。实例论证表明,所建模型具有整体性、动态性、灵活性和可分析性等优点,可以统筹林业生产管理活动,适用于国营林业局制定科学的生产管理方案。     

人工用材林最优密度控制模型

以抛物线型密度效应模型为前提，针对人工用材林生长系统的特点，用最优控制方法建模，以动态规划方法求解，导出最优密度控制模型。模型具有幂次数可变、适应性较强、疏伐间隔期可变和实际应用较方便等特点。模型在贵州马尾松人工用材林中的应用结果表明，模型计算结果符合人工用材林生长规律，并与实地试验吻合，表2参11。     

约束优化问题的遗传算法求解

应用遗传算法基本原理,采用锦标赛选择、算术交叉、均匀交叉、均匀变异和非均匀变异算子,设计了一般非线性规划和整数规划问题的通用求解算法,应用Matlab6.0编制了相应的求解软件。实例测试结果表明,该算法可以应用于一般的非线性规划和整数规划问题。     

扩展二次规划在电力系统无功优化中的应用

Based on the Simplex and Gradient method, a new algorithm (EBM) is presented for solving the quadratic programming with upper and lower bounds. Firstly the ideas of Beale''s method and extended LP are analysed, and then an extended Beale''s method (EBM) is     

Visual Programming of Stochastic Weather Generator and Future Applications on Agroecological Study

Based on former studies on weather simulator modules in IPMist laboratory, study on visual programming of stochastic weather generator (VS-WGEN) was continued. In this study, Marlkov Chain,Monte Carlo, Fourier Series, and weak stationary process were used to generate the daily weather data in software Matlab 6.0, with the data input from 40 years' weather data recorded by Beijing Weather Station. The generated data includes daily maximum temperature, minimum temperature, precipitation and solar radiation. It has been verified that the weather data generated by the VS-WGEN were more accurate than that by the old WGEN, when twenty new model parameters were included. VS-WGEN bas wide software applications,such as pest risk analysis, pest forecast and management. It can be implemented in hardware development as well, such as weather control in weather chamber and greenhouse for researches on ecological adaptation of crop varieties to a given location over time and space. Overall, VS-WGEN is a very useful tool for studies on theoretical and applied ecology.     

二次回归正交设计试验结果分析的程序设计

本文是进行二次回归正交设计试验结果分析的计算机程序设计。本程序的特点是:通过编码值和星号臂自动生成结构矩阵的交互项和二次项列,节省了手工计算和存贮空间;利用参数进行多因素多指标的试验结果分析,不受因素、指标和试验点的个数的限制;源程序是由通用 BASIC 语言写成,通用性强,移植性强,适用范围广,程序功能全面,输出结果完整,输出格式较好地拟合了统计格式,便于科技人员分析试验结果,透明度好,实用价值大。     

原条造材优化设计的研究

本文提出应用０—１规划法对原条造材进行优化设计．每一个可能造出原木段为变量ｘｉ，根据造出各种规格材累计价值为目标函数值，当满足各种约束条件时目标函数值最大的造材方案为优化方案．研究结果表明，该法在原条造材优化设计应用效果理想，具有显著的经济效益，方法简便，便予在便携式微型计算机上应用，只要输入原木价格，原条外形尺寸，等级区域，即可得到造材优化方案．     

PC-1500计算机软件扩充数据存贮量方法的研究

扩充计算机内存容量的方法有多种,但如果采用本文的研究成果,则会使PC—1500计算机又增添几个独特的优势:数据存贮量可扩大2～4倍,数据存贮可得到自我保护,数据转贮时间可大为缩短。