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不久前,农业部发布公告,表示将开展创建国家农产品质量安全监管示范县试点工作,拟建立县级农产品质量安全综合检测站,检验检测范围覆盖产地环境、投入品、农产品 相似文献
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LI Junfeng LIU Weian 《偏微分方程(英文版)》2009,(3):266-281
This paper is concerned with the asymptotic behavior of solution to the following model involving two species all with chemotaxis:{αp/αt=Dp△(p△lnp/w),αp/αt=Dq△(q△lnq/w),αw/αt=βp-δw,p△ln(p/w).^-n=q△ln(q/w).^-n=0.We prove that the solution exists globally asβ ≥ 0. Asβ 〈 0, whether the solution exists globally or not depends on the initial data. By function transformation and compari- son, the asymptotical behavior of the solution is studied. 相似文献