油田简易变电所无线远传技术的应用

对现有电表、传输途径、主站系统进行设计改造实现远距离简易变电所电量采集。     

A Water Model for Water and Environmental Management at Mae Moh Mine Area in Thailand

It is revealed that the water quality in Mae Moh Reservoir, Thailand, has been deteriorated by lignite mine drainage and power station effluent. This study aims to manipulate water quantity and quality to reduce environmental impacts in Mae Moh area through a model for water management. The model was constructed on the basis of materials balance to predict water flow, which includes concentrations of TDS and SO ^2– ₄. Data collected during 1996–2000 were used. Model validation showed that the mean of predicted and actual values of TDS and SO ^2– ₄ load were significantly similar at 95% confidence limit. The test result is acceptable and the water model can be used as a tool for water system management in the area. In 2006, Mae Moh mine excess water will be discharged at 10.76 Mm³, with a pH of 7.3, TDS and SO ^2– ₄ concentrations of 2,547 and 1,803 mg/l, respectively. Mae Moh power station effluent will be 14.59 Mm³, with pH of 7.1, TDS and SO ^2– ₄ concentrations of 610 and 358 mg/l, respectively. Predicted results showed that the outflow of Mae Moh Reservoir will be 83.67 Mm³ and the concentrations of TDS and SO ^2– ₄ will be as high as 1,501 and 822 mg/l, respectively. Mine excess water management measures are recommended according to the following strategy. All mine excess water should be stored during dry season. During wet season, 50% of the excess water should be stored and the remaining treated at 90% of TDS removal before being discharged. The end result would be a significant improvement in water quality in the Mae Moh Reservoir over the 4-year period to 2010. Pollutants in terms of TDS would be reduced by 35% from 1,501 mg/l in the beginning of 2006 to 975 mg/l at the end of 2009.     

中国工程造价咨询业的发展趋势——建筑测量(BS)

面临来自国内以及国外造价咨询行业的竞争,中国内地的工程造价咨询企业仅凭现有的造价咨询业务已经很难应对这些挑战,本文论述了建筑测量业务在中国工程造价咨询业的发展前景。     

清单投标报价合理性评审之研究

本文阐述了清单投标报价合理性评审的重要性,结合工程实践情况,研究探讨了评审的内容与方法,并提出推行投标报价合理性评审应采取的措施。     

基于对立统一定理与质量互变定理的水资源系统可变模糊评价新方法

根据可变模糊集理论导出的唯物辩证法对立统一与质量互变规律的数学定理——对立统一与质量互变定理，提出水资源系统新的可变模糊评价方法，新方法理论严谨、概念清晰、计算简便。文中列举水资源系统两个评价实例，（1）水资源可持续利用程度综合评价，（2）水安全综合评价。说明了新方法的原理、模型与计算步骤。并与模糊综合评判方法、集对分析评价法进行了比较与分析，指出模糊综合评判方法与集对分析评价法存在的问题与数学逻辑错误。     

利用分计量降低天然气供销差率的实践

分析了国内燃气公司供销差率现状,结合企业供销差率实际情况,介绍了利用分计量解决大表小流量产生供销差率的方法。通过采取有针对性的改进措施,如加装分计量表并进行跟踪分析、温压校正、流量表分级管理、定期普查管网等,在降低供销差率方面取得了良好的效果。     

我国工程量清单计价模式实施的理性思考

试就我国建设市场工程量清单计价模式实施中存在的问题进行探讨,并在分析现阶段实施发展情况的基础上,提出了相应对策与建议,以完善工程量清单计价管理制度和方法体系,并有效提高工程量清单计价评标定标的质量.     

浅谈高速公路计量软件的开发与应用前景

介绍了高速公路计量软件开发的过程,分析了公路计量软件开发应注重解决的问题,详细地阐述了公路计量软件的应用,对公路计量软件的应用前景进行了展望,以早日创造出真正符合高速公路的信息管理系统。     

大坪岩堆固结灌浆效果综合评价

结合大坪岩堆工程实例，介绍了岩堆固结灌浆的综合检测方法，通过野外实测法和XRD定量分析，确定了灌浆率并对灌浆量进行了计算，对大坪岩堆固结灌浆的综合检测结论进行了评价。     

分数阶奇异系统的Lie对称性与守恒量

对称性与守恒量可以简化动力学问题从而进一步求出力学系统的精确解,这样更加有利于研究动力学行为.分数阶模型相比于整数阶模型,能够描述复杂系统的动力学过程,因此在分数阶模型下研究对称性与守恒量是不可或缺的.首先介绍两个分数阶奇异系统,一个系统包含混合整数和Caputo分数阶导数,另一个系统仅含Caputo分数阶导数.由两个分数阶奇异系统分别给出两个分数阶固有约束,并给出对应的分数阶约束Hamilton方程.然后,基于微分方程在无限小变换下的不变性,给出了分数阶约束Hamilton方程Lie对称性的定义,导出了相应的确定方程,限制方程和附加限制方程.第三,建立并证明了两个分数阶约束Hamilton系统的Lie对称性定理,得到了相应的分数阶约束Hamilton系统的Lie守恒量.在特定条件下,本文所得结果可以退化为整数阶约束Hamilton系统的Lie守恒量.最后通过两个算例来说明此结果的应用.