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生命周期影响评价权重系数的确定方法探讨 被引量:18
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作者 田亚峥 郑泽根 《重庆建筑大学学报》 CSCD 2003年第5期61-64,共4页
随着生命周期评价应用的日益广泛,生命周期影响评价的完善也被提上日程。介绍了在影响评价中确定权重的三种方法,即专家法、层次分析法和线性回归方程法,为今后进行生命周期影响评价和研究提供了依据。
关键词 权重系数 生命周期影响评价 层次分析 线性回归方程法 专家
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承压含水层野外弥散试验实施方法研究——以吉林某水源地为例 被引量:3
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作者 袁伟 云智汉 《城市地质》 2019年第3期74-80,共7页
以吉林某水源地评价研究为基础,通过栓塞止水、单向阀止回及孔口压力注入等方式进行示踪剂投放,有效地解决了承压含水层弥散试验示踪剂投放难题,并通过实时监测的方式达到了数据的高密度监测,从源头上提高了试验成功率以及数据精度。通... 以吉林某水源地评价研究为基础,通过栓塞止水、单向阀止回及孔口压力注入等方式进行示踪剂投放,有效地解决了承压含水层弥散试验示踪剂投放难题,并通过实时监测的方式达到了数据的高密度监测,从源头上提高了试验成功率以及数据精度。通过人工流场和天然流场,利用改进直线法和二元线性回归方程法,分别对承压含水层不同水力梯度下的弥散参数进行求解,很好地解决了水源地承压含水层弥散系数求取问题,为承压含水层弥散试验的现场实施提供了成功经验。 展开更多
关键词 承压含水层 弥散试验 实施方 示踪剂 水源地 改进直线 二元线性回归方程法 人工流场 天然流场
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经济应用数学二例 被引量:1
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作者 彭小兵 《成都教育学院学报》 2000年第3期9-10,共2页
随着社会的进步和市场经济的不断发展,运用定量分析的方法建立经济数学模型解决相关的经济问题,已受到人们普遍重视。下面是经济中应用数学的两个实例。
关键词 经济应用数学 定量分析 标准差 线性回归方程法
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The Relationship Amongst Countries' Governance, Energy and Sustainable Development
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作者 Valdir de Jesus Lameira Walter Lee Ness +2 位作者 Jean Harris Osvaldo Quelhas Roberto Guimaraes Pereira 《Journal of Modern Accounting and Auditing》 2011年第3期252-264,共13页
In this paper we construct a theoretical framework linking governance practiced by some countries to some of their economical, financial, social and environmental variables. To achieve this goal, we selected a sample ... In this paper we construct a theoretical framework linking governance practiced by some countries to some of their economical, financial, social and environmental variables. To achieve this goal, we selected a sample of data composed of variables from 55 countries, available at the World Bank website. On the other hand, we measured the countries' level of governance by the indicator promoted by Transparency International. The period considered in this research was 8 years, from 2000 to 2008. We used the method of linear regression with panel data, in order to investigate statistical relationships among governance and the other variables. We applied the method of simultaneous equations in order to make a robustness test on the first results and findings. The results of the two models converged and showed the existence of a statistical significant relationship between governance and several of the variables investigated. This allows us to infer that the development of the countries govemanee is closely linked with the long-term sustainable development. 展开更多
关键词 GOVERNANCE sustainable development linear regressions structural equations
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Potential Energy of Crops
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作者 Jahangir Payamara 《Journal of Energy and Power Engineering》 2012年第7期1085-1087,共3页
This work consists of estimating the energy achieved from all land and water-based vegetations. This real potential is determined by identifying 10 biomass samples taken from vegetable resources which are favored by t... This work consists of estimating the energy achieved from all land and water-based vegetations. This real potential is determined by identifying 10 biomass samples taken from vegetable resources which are favored by their aptitude of adaptation to the conditions of Iran. The net energy values of the 10 biomass samples change in the range of 13.65-18.00 MJ/kg using bomb calorimeter. By means of least squarere regression method all correlations were found. The results of 10 different biomass materials have been used to develop a linear equation correlation. 展开更多
关键词 Potential treated waste water biome biofuels CROPS BIOFUEL net heating value linear equation correlation.
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