摘要:
摘 要：本文探讨在高电冲击载荷作用下，压电介质中裂纹尖端的热效应问题的奇异积分方程方法，通过引入热源功率，利用绝热近似，由简化的热传导方程得到了裂纹尖端在电冲击作用下短时间范围的温度场。通过构造位错密度函数，并利用Laplace变换和Fourier变换将原方程转化为Cauchy核的奇异积分方程，进而利用Chebyshev多项式展开以及Gauss-Chebyshev积分公式对该奇异积分方程进行数值求解，同时讨论了裂纹尺寸对温度升高值和升高区域大小的影响。
Abstract: With the global implementation of the “Framework Convention on Tobacco Control”, tobacco industry in different countries would meet more pressure in future development to a certain extent. This essay is based on Kunming flue-cured acquisition data 2006-2010 combined with quality control theory, non- constant process of quality control and logistic non-linear regression analysis to examine annual acquisition trend in history multi-levelly and multi-dimensionally and to excavate current situation deeply so as to discover natural discipline in flue-cured production, then establish an effective quality control index system of tobacco acquisition course assisted by current demands, which could lay the foundation for ensuring the acquisition process being accomplished efficiently and enhancing the ability of supplying high grade tobacco leaves, as well as strengthen the core competencies of Yunnan tobacco industry.