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煤矿一直是国家非常重要的燃料资源,煤矿的开采对于国家的经济发展起着至关重要的作用。在采集煤矿的过程中,采煤机是一种应用非常广泛的机械工具,采煤机的功能直接影响到煤矿的采集效率以及采集质量。文章对综采采煤机技术的基本现状进行分析,结合自身的经验,对于综采采煤机的创新路径进行探究,希望可以帮助综采采煤机技术得到发展。 相似文献
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本文介绍了现有MG800/2040-WD型电牵引采煤机的液压系统,分析了其优缺点。并对液压系统进行了改进设计,新的采煤机液压系统性能稳定,提高了该采煤机的工作效率。 相似文献
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构建生物质发电项目模糊综合评价体系的研究 总被引:1,自引:0,他引:1
生物质发电项目是我国近几年兴建较多的新能源项目,随着兴建、在建、运营的项目增多,构建一个此类项目的评价体系对于其评估批准兴建、运营管理有现实意义.以模糊评价方法为主,结合层次分析法构建了生物质发电项目的评价体系,并利用实例进行了检验、修正.结果证明该评价体系能够对生物质发电项目进行评价,结论正确.该评价体系构建对生物质发电项目兴建、运营管理决策起到有益作用. 相似文献
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本文运用综合评价原理和方法,对贺州市农业机械安全因素进行分析,并以调查问卷形式征求了专家们的意见,对影响农机安全管理的五个方面进行逐一分析、评价,并赋以实际权重,组成农机安全管理评价体系,最后以贺州市农业机械安全管理为对象,进行系统安全效果的评价,得出贺州市农机安全管理水平为良好. 相似文献
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通过分析东江流域形成洪水灾害的主要影响因素,构建了流域洪灾风险评价指标体系,利用层次分析法确定了各评价指标的权重,基于GIS技术运用模糊综合评价方法对东江流域洪水灾害风险进行了综合评价.结果表明:东江流域洪灾风险度最高的地方为河源市区、惠州市区、惠阳区以及龙岗等经济较发达地区;而较安全区域则位于流域中上游经济发展较为落后的山区.评价结果与往年大洪水造成的灾害区域基本吻合,表明基于格网的空间模糊综合评价方法用于洪灾风险评价是可行的,评价结果也是合理的. 相似文献
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针对现行工程经济评价方法在多方案优选时不易决策的问题,提出了将模糊综合评价理论应用于项目的工程经济评价中,采用层次分析法确定指标权重,综合考虑常用的5个经济评价指标,提出了一种基于模糊综合评价理论的工程经济评价方法.并以山东省某调水补源工程为例进行应用.实例结果显示该评价方法可行,评价结果合理. 相似文献
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周振民 《中国农村水利水电》2009,(5)
水环境评价受到很多因素的影响,其相互作用比较复杂.为了能够更好地反映水环境评价中各个影响因素,采取模糊综合评判方法对水环境进行评价.结果表明,模糊综合评判方法对水环境评价具有良好的可靠性,可以确定出水体中主要污粢物,为合理制定治理措施提供依据,并为其他方法进行水环境评价提供参照. 相似文献
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高职院校人才培养质量模糊综合评价 总被引:1,自引:0,他引:1
模糊数学方法的使用提高了教育研究运用数学作定量研究的能力,本文给出了采用模糊综合评价对高职院校人才培养质量的量化评价方法和步骤. 相似文献
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《Journal of Agricultural Engineering Research》1998,69(3):249-254
A model to represent the discolouration of dried powder of carrots as a function of temperature was developed. Two types of carrots, Asian and European, containing large amount of lycopene and β-carotene, respectively, were tested. The dried powder was stored under an atmosphere with O2and at three different temperatures, 5,20 and 35°C. The surface colour of the powder was monitored during storage by a Hunter colour ratioa/b. In the proposed model, the rate of oxidation was assumed to be represented by the product of the fraction of concentration of oxidized pigment at arbitrary time and a specific rate of oxidation of pigment. The rate parameters in the proposed model were calculated by fitting the experimental data with smooth curves by trial and error at the end of the induction period but before discolouration took place. The frequency constant and activation energy, expressing the temperature dependence of the rate parameters, were expressed by the Arrhenius relation. The simulation results of a Hunter colour ratioa/bof dried powder at 25°C showed good agreement with the experimental data, suggesting that the proposed model was effective for the prediction of discolouration of dried powder of both types of carrot. The use of the induction period in the manner described may enable the shelf life of dried powder to be predicted. 相似文献
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感官检验棉花的品级,这是农村常见的一种检测手段.它的一个主要特点就是存在不确定性.这是由于检验员的品级检验水平存在一定的差异,其中有很多因素制约着检验的结果.文章对影响感官检验结果的因素进行了系统的分析. 相似文献
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从灾害经济学的角度探讨了城镇供水优化调度的必要性和可能性,认为在缺水不可避免的情况下,对供水进行优化调度可以减小缺水带来的损失,产生较好的减灾效益,特别是可以大大减小严重干旱的灾害效应。并根据水资源的特性,提出了缺水损失的计算模式以及优化调度的原则和方法。 相似文献
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The fractional outflow rate of water from the rumen, measured as the rate of disappearance of the chromium complex of ethylenediamine tetra-acetic acid, was related to a number of dietary factors. A multiple regression equation was derived which expressed fractional outflow rate as a function of the intakes of dry matter, ash, acid-detergent fibre and crude protein.The data analysed consisted of 243 observations for sheep on 59 diets, including forage, concentrate and mixed diets. The ranges covered by the data were: fractional outflow rate 0.7–3.6 day?1; dry matter intake 560–1400g/day; ash 4–30%, acid-detergent fibre 7–41%, crude protein 5–26 % of dry matter; there were no observations for sheep of less than 34 kg liveweight.The equation accounted for 56·3 % of the total variance. Between-sheep variance could not be calculated for the whole of the data but was undoubtedly substantial since, for a sixth of the data, it was known to account for 38 % of the total variance. 相似文献