为了客观评价地下空间开发地质适宜性并为评价工作提供一种新思路和参考,提出了一种基于三角模糊数的模糊层次分析法(fuzzy analytic hierarchy process based on triangular fuzzy numbers,FAHP)和优劣解距离法(technique for order pr...为了客观评价地下空间开发地质适宜性并为评价工作提供一种新思路和参考,提出了一种基于三角模糊数的模糊层次分析法(fuzzy analytic hierarchy process based on triangular fuzzy numbers,FAHP)和优劣解距离法(technique for order preference by similarity to ideal solution,TOPSIS)相结合的评价方法。通过地质调查研究构建基于土体工程地质性质、水文地质条件、不良地质作用、地形地貌等影响因素为主的层次分析关系模型。基于专家判别利用FAHP计算各评价因素的权重,以各评价指标层的分级临界值作为典型评价样本,利用TOPSIS法对适宜性等级进行非等分划分,基于区间值优化的TOPSIS法建立最终评价模型,通过ArcGIS的空间分析功能等确定每个评价单元适宜性等级。该方法与传统方法相比一定程度上减少了评价过程中专家评判的过多主观影响,评价过程更倾向于定量化,结果更为客观。利用该方法对无锡市区浅层地下空间开发地质适宜性进行评价,评价结果与实际工程经验相符,证明了该方法的有效性,因此该方法对地下空间开发适宜性评价工作具有一定借鉴意义。展开更多
基于迈克尔·波特的价值链理论模型构建中国城市创意指数,包括7个1级指标和18个2级指标.采用变异系数加权法和TOPSIS(technique for order preference by similarity to ideal solution)分析法对中国20个城市的数据进行实证研究,分...基于迈克尔·波特的价值链理论模型构建中国城市创意指数,包括7个1级指标和18个2级指标.采用变异系数加权法和TOPSIS(technique for order preference by similarity to ideal solution)分析法对中国20个城市的数据进行实证研究,分析影响城市创意水平发展的驱动因素.结果表明,评价指标体系中,经济资本、人力资本、文化资本、技术资本、产业资本、环境资本和制度资本7个影响因素与创意城市的发展呈正相关,其中文化资本和产业资本是最重要的影响因素.根据各指标影响程度的差异化,指出创意城市发展所面临的挑战,提出加强文化建设、发展创意产业、重视创意人才的培养、营造创意氛围和改善制度环境等建议,以提升城市创意竞争力.展开更多
为提高机场运行效率评价结果的科学性和全面性,提出了一种基于组合赋权-TOPSIS(technique for order performance by similarity to ideal solution)模型的机场运行效率评价方法。从机位运行效率、旅客登机效率、飞机滑行效率和协同效率...为提高机场运行效率评价结果的科学性和全面性,提出了一种基于组合赋权-TOPSIS(technique for order performance by similarity to ideal solution)模型的机场运行效率评价方法。从机位运行效率、旅客登机效率、飞机滑行效率和协同效率4个维度出发,构建了由航班靠桥率、廊桥周转率、机位变更比例等11个指标组成的机场运行效率评价体系;利用G1法、熵权法分别计算评价指标主观和客观权重,以最小化主客观加权属性偏离程度为目标计算组合权重;使用TOPSIS计算待评价机场综合评价指数。利用该模型分析国内3类共8家机场的运行效率,可以得到各评价对象的运行效率等级和综合排名。结果表明:该模型能够有效探明影响机场运行效率的主要因素,具有一定的参考价值。展开更多
目的:比较3.0T MRI FIESTA与IDEAL序列腰骶神经根受压成像的诊断价值。方法:22例腰椎间盘突出患者分别行常规序列、FIESTA序列和IDEAL序列扫描,所有图像均进行后处理重建,对图像的质量和清晰度、受压神经显示清晰度、腰骶神经根与邻近椎...目的:比较3.0T MRI FIESTA与IDEAL序列腰骶神经根受压成像的诊断价值。方法:22例腰椎间盘突出患者分别行常规序列、FIESTA序列和IDEAL序列扫描,所有图像均进行后处理重建,对图像的质量和清晰度、受压神经显示清晰度、腰骶神经根与邻近椎体(脑脊液)的对比噪声比4个方面进行评价。结果:神经根-脑脊液CNR值FIESTA序列明显大于IDEAL序列(283.24±117.97 vs 96.28±39.29,P=0.000),图像质量及清晰度评分FIESTA序列大于IDEAL序列(4.66±0.33 vs 4.22±0.68,P=0.028),受压神经显示清晰度IDEAL序列大于FIESTA序列(2.78±0.45 vs 2.19±0.83,P=0.023),差异均有统计学意义。结论:FIESTA序列扫描时间短,观察神经根受压及治疗前后比较,较有优势;IDEAL序列对于受压神经根的定位、神经根受压及损伤程度的成像特点更有优势。展开更多
The selection of refracturing candidate is one of the most important jobs faced by oilfield engineers. However, due to the complicated multi-parameter relationships and their comprehensive influence, the selection of ...The selection of refracturing candidate is one of the most important jobs faced by oilfield engineers. However, due to the complicated multi-parameter relationships and their comprehensive influence, the selection of refracturing candidate is often very difficult. In this paper, a novel approach combining data analysis techniques and fuzzy clustering was proposed to select refracturing candidate. First, the analysis techniques were used to quantitatively calculate the weight coefficient and determine the key factors. Then, the idealized refracturing well was established by considering the main factors. Fuzzy clustering was applied to evaluate refracturing potential. Finally, reservoirs numerical simulation was used to further evaluate reservoirs energy and material basis of the optimum refracturing candidates. The hybrid method has been successfully applied to a tight oil reservoir in China. The average steady production was 15.8 t/d after refracturing treatment, increasing significantly compared with previous status. The research results can guide the development of tight oil and gas reservoirs effectively.展开更多
William Shakespeare was a patriotic song and heroic epic in praise of the great contributions Henry V (1387-1422) made to England, who represents Shakespeare’s ideal of a good king and aspiration for the national uni...William Shakespeare was a patriotic song and heroic epic in praise of the great contributions Henry V (1387-1422) made to England, who represents Shakespeare’s ideal of a good king and aspiration for the national unity of England under a powerful and efficient monarch.展开更多
文摘为了客观评价地下空间开发地质适宜性并为评价工作提供一种新思路和参考,提出了一种基于三角模糊数的模糊层次分析法(fuzzy analytic hierarchy process based on triangular fuzzy numbers,FAHP)和优劣解距离法(technique for order preference by similarity to ideal solution,TOPSIS)相结合的评价方法。通过地质调查研究构建基于土体工程地质性质、水文地质条件、不良地质作用、地形地貌等影响因素为主的层次分析关系模型。基于专家判别利用FAHP计算各评价因素的权重,以各评价指标层的分级临界值作为典型评价样本,利用TOPSIS法对适宜性等级进行非等分划分,基于区间值优化的TOPSIS法建立最终评价模型,通过ArcGIS的空间分析功能等确定每个评价单元适宜性等级。该方法与传统方法相比一定程度上减少了评价过程中专家评判的过多主观影响,评价过程更倾向于定量化,结果更为客观。利用该方法对无锡市区浅层地下空间开发地质适宜性进行评价,评价结果与实际工程经验相符,证明了该方法的有效性,因此该方法对地下空间开发适宜性评价工作具有一定借鉴意义。
文摘基于迈克尔·波特的价值链理论模型构建中国城市创意指数,包括7个1级指标和18个2级指标.采用变异系数加权法和TOPSIS(technique for order preference by similarity to ideal solution)分析法对中国20个城市的数据进行实证研究,分析影响城市创意水平发展的驱动因素.结果表明,评价指标体系中,经济资本、人力资本、文化资本、技术资本、产业资本、环境资本和制度资本7个影响因素与创意城市的发展呈正相关,其中文化资本和产业资本是最重要的影响因素.根据各指标影响程度的差异化,指出创意城市发展所面临的挑战,提出加强文化建设、发展创意产业、重视创意人才的培养、营造创意氛围和改善制度环境等建议,以提升城市创意竞争力.
文摘为提高机场运行效率评价结果的科学性和全面性,提出了一种基于组合赋权-TOPSIS(technique for order performance by similarity to ideal solution)模型的机场运行效率评价方法。从机位运行效率、旅客登机效率、飞机滑行效率和协同效率4个维度出发,构建了由航班靠桥率、廊桥周转率、机位变更比例等11个指标组成的机场运行效率评价体系;利用G1法、熵权法分别计算评价指标主观和客观权重,以最小化主客观加权属性偏离程度为目标计算组合权重;使用TOPSIS计算待评价机场综合评价指数。利用该模型分析国内3类共8家机场的运行效率,可以得到各评价对象的运行效率等级和综合排名。结果表明:该模型能够有效探明影响机场运行效率的主要因素,具有一定的参考价值。
文摘目的:比较3.0T MRI FIESTA与IDEAL序列腰骶神经根受压成像的诊断价值。方法:22例腰椎间盘突出患者分别行常规序列、FIESTA序列和IDEAL序列扫描,所有图像均进行后处理重建,对图像的质量和清晰度、受压神经显示清晰度、腰骶神经根与邻近椎体(脑脊液)的对比噪声比4个方面进行评价。结果:神经根-脑脊液CNR值FIESTA序列明显大于IDEAL序列(283.24±117.97 vs 96.28±39.29,P=0.000),图像质量及清晰度评分FIESTA序列大于IDEAL序列(4.66±0.33 vs 4.22±0.68,P=0.028),受压神经显示清晰度IDEAL序列大于FIESTA序列(2.78±0.45 vs 2.19±0.83,P=0.023),差异均有统计学意义。结论:FIESTA序列扫描时间短,观察神经根受压及治疗前后比较,较有优势;IDEAL序列对于受压神经根的定位、神经根受压及损伤程度的成像特点更有优势。
基金Projects(51204054,51504203)supported by the National Natural Science Foundation of ChinaProject(2016ZX05023-001)supported by the National Science and Technology Major Project of China
文摘The selection of refracturing candidate is one of the most important jobs faced by oilfield engineers. However, due to the complicated multi-parameter relationships and their comprehensive influence, the selection of refracturing candidate is often very difficult. In this paper, a novel approach combining data analysis techniques and fuzzy clustering was proposed to select refracturing candidate. First, the analysis techniques were used to quantitatively calculate the weight coefficient and determine the key factors. Then, the idealized refracturing well was established by considering the main factors. Fuzzy clustering was applied to evaluate refracturing potential. Finally, reservoirs numerical simulation was used to further evaluate reservoirs energy and material basis of the optimum refracturing candidates. The hybrid method has been successfully applied to a tight oil reservoir in China. The average steady production was 15.8 t/d after refracturing treatment, increasing significantly compared with previous status. The research results can guide the development of tight oil and gas reservoirs effectively.
文摘William Shakespeare was a patriotic song and heroic epic in praise of the great contributions Henry V (1387-1422) made to England, who represents Shakespeare’s ideal of a good king and aspiration for the national unity of England under a powerful and efficient monarch.
