Considering the stratum anti-drilling ability,drill bit working conditions,drill bit application effect and drill bit economic benefits,the similarity of stratum anti-drilling ability was evaluated by grey relational ...Considering the stratum anti-drilling ability,drill bit working conditions,drill bit application effect and drill bit economic benefits,the similarity of stratum anti-drilling ability was evaluated by grey relational analysis theory to screen out candidate drill bits with reference values.A new comprehensive performance evaluation model of drill bit was established by constructing the absolute ideal solution,changing the relative distance measurement method,and introducing entropy weight to work out the closeness between the candidate drill bits and ideal drill bits and select the reasonable drill bit.Through the construction of absolute ideal solution,improvement of relative distance measurement method and introduction of entropy weight,the inherent defects of TOPSIS decision analysis method,such as non-absolute order,reverse order and unreasonable weight setting,can be overcome.Simple in calculation and easy to understand,the new bit selection method has good adaptability to drill bit selection using dynamic change drill bit database.Field application has proved that the drill bits selected by the new drill bit selection method had significant increase in average rate of penetration,low wear rate,and good compatibility with the drilled formations in actual drilling.This new method of drill bit selection can be used as a technical means to select drill bits with high efficiency,long life and good economics in oilfields.展开更多
消费者信任对于online to offline(O2O)电子商务的发展起到至关重要的作用,首先从消费者、商家及产品、O2O网站平台及交易环境四个方面,分析了影响O2O电子商务消费者信任的主要因素;然后用层次分析法(AHP)和模糊综合评价分析建立了O2O...消费者信任对于online to offline(O2O)电子商务的发展起到至关重要的作用,首先从消费者、商家及产品、O2O网站平台及交易环境四个方面,分析了影响O2O电子商务消费者信任的主要因素;然后用层次分析法(AHP)和模糊综合评价分析建立了O2O电子商务消费者信任测度模型,并采集数据对消费者信任模型进行了实证研究。实证分析表明,目前消费者对O2O电子商务的总体信任度水平偏低。该研究模型和量化测度结果可为商家在O2O电子商务发展的不同阶段的科学决策提供信息支持。展开更多
基金Supported by China National Science and Technology Major Project(2016ZX05020-006)。
文摘Considering the stratum anti-drilling ability,drill bit working conditions,drill bit application effect and drill bit economic benefits,the similarity of stratum anti-drilling ability was evaluated by grey relational analysis theory to screen out candidate drill bits with reference values.A new comprehensive performance evaluation model of drill bit was established by constructing the absolute ideal solution,changing the relative distance measurement method,and introducing entropy weight to work out the closeness between the candidate drill bits and ideal drill bits and select the reasonable drill bit.Through the construction of absolute ideal solution,improvement of relative distance measurement method and introduction of entropy weight,the inherent defects of TOPSIS decision analysis method,such as non-absolute order,reverse order and unreasonable weight setting,can be overcome.Simple in calculation and easy to understand,the new bit selection method has good adaptability to drill bit selection using dynamic change drill bit database.Field application has proved that the drill bits selected by the new drill bit selection method had significant increase in average rate of penetration,low wear rate,and good compatibility with the drilled formations in actual drilling.This new method of drill bit selection can be used as a technical means to select drill bits with high efficiency,long life and good economics in oilfields.
文摘消费者信任对于online to offline(O2O)电子商务的发展起到至关重要的作用,首先从消费者、商家及产品、O2O网站平台及交易环境四个方面,分析了影响O2O电子商务消费者信任的主要因素;然后用层次分析法(AHP)和模糊综合评价分析建立了O2O电子商务消费者信任测度模型,并采集数据对消费者信任模型进行了实证研究。实证分析表明,目前消费者对O2O电子商务的总体信任度水平偏低。该研究模型和量化测度结果可为商家在O2O电子商务发展的不同阶段的科学决策提供信息支持。
