二元对比模糊优选理论在桩基础选型中的应用

建筑工程需要选用不同的桩基础进行设计。桩基础的选型有很多的评价因素,且评价因素具有模糊性的特点。以前的相关研究多采用给桩基础打分,比较其所占权重的方式进行。将企业生产中常用的二元相对比较的模糊优选理论应用到桩基础选型当中,对各个评价因素进行分析,然后比较其所占的权重。结合一个工程实例对桩基础选型进行模糊优选,获得了优选桩型方案。     

基于灵敏度分析方法的第三方物流最优定价模型

在分析第三方物流供需平衡的基础上,提出了第三方物流市场份额分配模型.并运用灵敏度分析方法重点分析价格因素对对物流市场份额的影响,得出最优定价的关系式.最后通过一算例来说明模型和算法的有效性.     

喷灌条件下冬小麦生长及耗水规律的研究

揭示了喷灌条件下冬小麦生长指标的变化规律 ,建立相对产量和相对耗水量的模型 ,分析水分亏缺敏感指数 ,并提出了喷灌条件下适宜灌水定额     

Grey Optimal Options of Design Plans for Deep Cutting Slope

The selection of the design plans for deep cutting slope of high-level highway in mountain area,in general speaking,only depends on the designer's experience and intuitive determination at the present time,which results in unreasonable,even error,decision or plan.It unavoidably causes enormous damage.This paper proposes to adopt correlation degree analysis method of grey system theory for choosing the optimal design plan.It will give a definite and real meaning about choosing design plan and avoiding or reducing errors in design work.     

水资源灌溉工程规划的研究及其效益

研究平原灌区灌溉用水量最省、工程体系费用最少、提水耗能最省、渠系占地面积最小的计算模型;并以聊城地区为例,进行了效益分析     

喷灌系统田间管网的优化设计及其投资比较

本文通过多种田间管网的布置形式方案的比较,研究和探讨了适合湛江市区情的喷灌方式。     

沈阳市浑北灌区水资源实时预报优化调度的研究

采用实时预报方法对沈阳浑北灌区水资源的优化调度进行了研究,实时预报优化调度以系统分析理论为基础,以短期天气预报较高可信度为前提,根据运行费用和缺水造成的减产损失之和为最小的原则建立目标函数。以灌水过程中的实际情况作为约束条件,用Ｃ语言编制了以线性规划中的单纯形法为主的实时优化调度程度。这种预报方法可以克服常规灌溉方法的一些缺点,达到充分利用降雨,节约灌溉水资源的效果。     

Reduction of Optimal Thermal Range in Aging Western Cherry Fruit Flies (Diptera: Tephritidae)

The western cherry fruit fly is an economically important pest of sweet cherries in the western United States. The potential of this pest to establish and spread in areas in which it is not currently present has been the focus of recent research. Most published information on the thermal tolerance and optimal thermal range of this pest has focused primarily on the diapausing pupae and predictive phenology models. Microrespirometry and differential calorimetry can be useful tools in describing the thermotolerance and optimal thermal range of insects. This methodology was employed to investigate the effects of western cherry fruit fly adult age on the optimal thermal range. Newly emerged flies exhibited the widest optimal thermal range spanning from 6.6 to 42.2°C for a total range of 35.8°C during heating scans of 0.4°C/min from 2 to 50°C. This range diminished as the flies aged, with the shortest span observed with 28-d-old flies ranging from 10.5 to 37.8°C, a span of 27.2°C. Measurements of heat rate and oxygen consumption at isothermal, or static, temperatures indicated that all flies could survive exposure to 40°C for at least 20 min, and that metabolism was greatly reduced, with a concomitant reduction in oxygen consumption rate at 40 to 42°C. All flies exhibited a heat rate and oxygen consumption rate of zero when exposed to 45 and 50°C. The loss of thermotolerance in adult flies can influence its ability to establish and spread in climates where daily temperatures exceed the optimal thermal range of this species.     

基于Matlab GUI的滴灌毛管优化设计程序研究

滴灌工程设计中,科学合理布设滴灌带对节水成效和工程投资都具有十分重要的影响。为提高滴灌规划设计的效率及优化效果,最大限度增大毛管铺设长度、减少滴灌工程建设单位投资,在现有滴灌水力模型的基础上,采用Matlab GUI和遗传算法工具箱相结合的方法,对毛管优化设计过程进行模块化程序设计。经验证,该优化程序界面友好,计算可靠,不仅大大减少了人工计算量,对当前滴灌工程规划设计和推广也有重要帮助。     

普通城门洞形断面临界水深的直接计算公式

普通城门洞形断面临界水深的计算涉及超越方程的求解,理论上无解析解。运用逐次优化拟合原理,求出其临界水深无量纲方程的近似解析解,提出了新的临界水深直接计算公式。结果表明,在工程适用参数范围内,临界水深计算值的最大相对误差绝对值为0.115%,平均相对误差绝对值仅为0.032%。新建立的城门洞形断面临界水深直接计算公式物理概念清晰明确,形式简捷,与现有的各类计算公式相比,计算精度高且适用范围广。