We study eigenvalues of an elliptic operator with mixed boundary conditions on very general decompositions of the boundary.We impose nonhomogeneous conditions o
In this article,we study the system with boundary degeneracy uit-div(a(x)｜▽ui｜pi-2▽ui) =fi(x,t,u1,u2),(x,t) ∈ΩT.Applying the monotone iterattion technique and
In this paper,we consider the diffusion limit of the small mean free path for the radiative transfer equations,which describe the spatial transport of radiation
The first part of this paper is devoted to study the existence of solution for nonlinear p(x) elliptic problem A(u) =μ in Ω,u =0 on (б)Ω,with a right-hand s
棉花作为一种重要的经济作物,在我国国民经济和社会发展中占有重要地位。由于我国人多地少,粮棉争地的矛盾十分突出,因此,培育高产优质棉花品种一直是棉花育种家长期追求的目标。陆地棉以其产量高、适应性广的特点被广泛种植,海岛棉则以得天独厚的优良纤维品质著称于世,如何将陆地棉的高产与海岛棉的优质特点结合起来,从而培育出高产、优质的棉花新品种一直是育种家追求的目标,同时,也希望能够通过海陆杂交群体来研究得到高
本文选取莱州湾东岸地貌冲淤演变较为典型的界河口—石虎嘴岸段为研究对象,在海图、地形图和遥感影像等多源信息基础上,利用Arcgis提取6条岸线,采用冲淤面积法对不同时期的地貌演变进行定量分析。研究结果表明:近50年来,界河口—石虎嘴岸段以蚀退为主,伴有部分淤进。蚀退面积为13.2×10~5m~2,时间集中在1959—1969年、1984—1998年,其中界河口附近蚀退尤为严重;淤进面积为9.5×10
In this paper we consider the relaxation limits of the two-fluid Euler-Maxwell systems with initial layer. We construct an asymptotic expansion with initial lay
In this work,a characterization of the doubly-weighted Bohr spectrum of an almost periodic function is given.We showed precisely that such a spectrum is either
In this paper,a generalized nonlinear dissipative and dispersive equation with time and space-dependent coefficients is considered.We show that the control of t
“在高等学校读书的学生”,这就是“大学生”这一概念的内涵。进大学读书以前和大学毕业工作之后,就不宜称其为“大学生”了。但是,现在有些报刊误用“大学生”一词的现象较