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一种求气井二项式方程系数的新方法
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作者 杨彦军 杨宇 张文喜 《矿物岩石》 CAS CSCD 北大核心 2003年第2期108-110,共3页
针对开发早期气田缺乏产能试井资料的实际情况 ,由于无法用传统的压力降法计算产能方程 ,故而基于最优化算法 ,提出了一种利用稳定生产数据和井控储量求取气井产能方程系数的新方法。在只知道稳定生产数据情况下便可进行计算分析。该方... 针对开发早期气田缺乏产能试井资料的实际情况 ,由于无法用传统的压力降法计算产能方程 ,故而基于最优化算法 ,提出了一种利用稳定生产数据和井控储量求取气井产能方程系数的新方法。在只知道稳定生产数据情况下便可进行计算分析。该方法在气田进行了实际应用 ,并和实际资料以及传统试凑法计算的结果进行了比较 ,表明方法的计算结果较为可靠。 展开更多
关键词 产能试井 最优化 计算方法 试井资料 压力降法 气驱气藏 二项式方程系数
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A Journey into Fermat's Equation 被引量:1
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作者 Mario De Paz Enzo Bonacci 《Journal of Mathematics and System Science》 2012年第9期539-544,共6页
As expounded in some recent mathematical conferences, this research on that amazing source of algebraic ideas known as Fermat's equation is aimed to prove how Fermat triples can be limited until the impossible existe... As expounded in some recent mathematical conferences, this research on that amazing source of algebraic ideas known as Fermat's equation is aimed to prove how Fermat triples can be limited until the impossible existence through a criterion of incompatible parities related to unexplored properties of the binomial coefficients. In this paper, the authors use a technique based on the analysis of four numbers and their internal relations with three basic compulsory factors. It leads to the practical impossibility to find any triple of natural numbers candidate to satisfy Fermat's equation, because when the authors try to meet a condition between parity and range the authors are compelled to violate the other one, so that they are irreducibly alternative. In particular, there is a parity violation when the authors choose all the basic factors in the allowed range and the authors obtain exceeding values of one of the involved variables when the authors try to restore the parity. Since Fermat's last theorem would consequently be demonstrated, many readers could recall the never found elementary proof of FLT (Fermat's last theorem) claimed by Pierre de Fermat. The authors are not encouraging such an interpretation because this paper is intended as a journey into Fermat's equation and the reader's attitude should be towards the algebraic achievements here proposed, with their possible hidden flaws and future developments, rather than to legendary problems like Fermat's riddle. 展开更多
关键词 Fermat's equation binomial coefficients incompatible parities Fermat's last theorem Fermat's little theorem.
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