The steady oil production and pressure distribution formulae of vertically fractured well for power-law non-Newtonian fluid were derived on the basis of the elliptic flow model in fractal reservoirs. The corresponding...The steady oil production and pressure distribution formulae of vertically fractured well for power-law non-Newtonian fluid were derived on the basis of the elliptic flow model in fractal reservoirs. The corresponding transient flow in fractal reservoirs was studied by numerical differentiation method: the influence of fractal index to transient pressure of vertically fractured well was analyzed. Finally the approximate analytical solution of transient flow was given by average mass conservation law. The study shows that using elliptic flow method to analyze the flow of vertically fractured well is a simple method.展开更多
While studying the flow of oil and gas in the reservoir, it is not realistic that capillary with circular section is only used to express the pores. It is more representative to simulate porous media pore with kinds o...While studying the flow of oil and gas in the reservoir, it is not realistic that capillary with circular section is only used to express the pores. It is more representative to simulate porous media pore with kinds of capillary with triangle or rectangle section etc. In the condition of the same diameter, when polymer for oil displacement flows in the porous medium, there only exists shear flow which can be expressed with power law model. Based on fluid flow-pressure drop equation in single capillary, this paper gives a calculation method of equivalent permeability of power law fluid of single capillary and capillary bundles with different sections.展开更多
This article explores the use of social networks by workers in Abidjan, Côte d’Ivoire, with particular emphasis on a descriptive or quantitative analysis aimed at understanding motivations and methods of use. Mo...This article explores the use of social networks by workers in Abidjan, Côte d’Ivoire, with particular emphasis on a descriptive or quantitative analysis aimed at understanding motivations and methods of use. More than five hundred and fifty questionnaires were distributed, highlighting workers’ preferred digital channels and platforms. The results indicate that the majority use social media through their mobile phones, with WhatsApp being the most popular app, followed by Facebook and LinkedIn. The study reveals that workers use social media for entertainment purposes and to develop professional and social relationships, with 55% unable to live without social media at work for recreational activities. In addition, 35% spend on average 1 to 2 hours on social networks, mainly between 12 p.m. and 2 p.m. It also appears that 46% believe that social networks moderately improve their productivity. These findings can guide marketing strategies, training, technology development and government policies related to the use of social media in the workplace.展开更多
移动智能终端的不断升级和各种互联网技术的融合发展给社会化媒体产业带来了巨大的增长空间,近年来社会化媒体研究也随之成为最具增长力的学科领域之一。经典洛特卡定律能揭示特定研究领域作者数与所著科学文献数之间的规律,常被用来评...移动智能终端的不断升级和各种互联网技术的融合发展给社会化媒体产业带来了巨大的增长空间,近年来社会化媒体研究也随之成为最具增长力的学科领域之一。经典洛特卡定律能揭示特定研究领域作者数与所著科学文献数之间的规律,常被用来评判特定研究领域的发展成熟度,但存在精度不够等问题。在经典洛特卡定律的基础上,结合国际社会化媒体研究领域最新发展,拟合出该领域洛特卡定律常数的非线性回归方法来提高计算精度:以1994—2013年间ISI Web of Science数据库中社会化媒体相关主题的8 021篇文献为研究样本(SSCI数据库文献4 501篇,SCI数据库的文献4 279篇)展开研究,并进行K-S一致性检验。统计分析结果表明:国际社会化媒体领域的研究虽处于快速发展阶段,但成熟度不高,核心作者群尚未达到稳定状态。展开更多
文摘The steady oil production and pressure distribution formulae of vertically fractured well for power-law non-Newtonian fluid were derived on the basis of the elliptic flow model in fractal reservoirs. The corresponding transient flow in fractal reservoirs was studied by numerical differentiation method: the influence of fractal index to transient pressure of vertically fractured well was analyzed. Finally the approximate analytical solution of transient flow was given by average mass conservation law. The study shows that using elliptic flow method to analyze the flow of vertically fractured well is a simple method.
基金Supported by the National Natural Science Foundation of China Youth Science Fund （51104030） Supported by the Science and Technology Research Project of Heilongjiang Province Department of Education（12521059） Supported by the China Postdoctoral Science Foundation（2014M561325）
文摘While studying the flow of oil and gas in the reservoir, it is not realistic that capillary with circular section is only used to express the pores. It is more representative to simulate porous media pore with kinds of capillary with triangle or rectangle section etc. In the condition of the same diameter, when polymer for oil displacement flows in the porous medium, there only exists shear flow which can be expressed with power law model. Based on fluid flow-pressure drop equation in single capillary, this paper gives a calculation method of equivalent permeability of power law fluid of single capillary and capillary bundles with different sections.
文摘This article explores the use of social networks by workers in Abidjan, Côte d’Ivoire, with particular emphasis on a descriptive or quantitative analysis aimed at understanding motivations and methods of use. More than five hundred and fifty questionnaires were distributed, highlighting workers’ preferred digital channels and platforms. The results indicate that the majority use social media through their mobile phones, with WhatsApp being the most popular app, followed by Facebook and LinkedIn. The study reveals that workers use social media for entertainment purposes and to develop professional and social relationships, with 55% unable to live without social media at work for recreational activities. In addition, 35% spend on average 1 to 2 hours on social networks, mainly between 12 p.m. and 2 p.m. It also appears that 46% believe that social networks moderately improve their productivity. These findings can guide marketing strategies, training, technology development and government policies related to the use of social media in the workplace.
文摘移动智能终端的不断升级和各种互联网技术的融合发展给社会化媒体产业带来了巨大的增长空间,近年来社会化媒体研究也随之成为最具增长力的学科领域之一。经典洛特卡定律能揭示特定研究领域作者数与所著科学文献数之间的规律,常被用来评判特定研究领域的发展成熟度,但存在精度不够等问题。在经典洛特卡定律的基础上,结合国际社会化媒体研究领域最新发展,拟合出该领域洛特卡定律常数的非线性回归方法来提高计算精度:以1994—2013年间ISI Web of Science数据库中社会化媒体相关主题的8 021篇文献为研究样本(SSCI数据库文献4 501篇,SCI数据库的文献4 279篇)展开研究,并进行K-S一致性检验。统计分析结果表明:国际社会化媒体领域的研究虽处于快速发展阶段,但成熟度不高,核心作者群尚未达到稳定状态。
