排序方式: 共有16条查询结果,搜索用时 15 毫秒
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Wenxiong Chen Congming Li 《数学物理学报(B辑英文版)》2009,29(4):949-960
We classify all positive solutions for the following integral system:{ui(x)=∫Rn1/│x-y│^n-α fi(u(y))dy,x∈R^n,i=1,…,m,0〈α〈n,and u(x)=(u1(x),u2(x)…,um(x)).Here fi(u), 1 ≤ i ≤m, monotone nondecreasing are real-valued functions of homogeneous degree n+α/n-α and are monotone nondecreasing with respect to all the independent variables U1, u2, ..., urn.In the special case n ≥ 3 and α = 2. we show that the above system is equivalent to thefollowing elliptic PDE system:This system is closely related to the stationary SchrSdinger system with critical exponents for Bose-Einstein condensate 相似文献
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Let G(V, E) be a unicyclic graph, Cm be a cycle of length m and Cm G, and ui ∈ V(Cm). The G - E(Cm) are m trees, denoted by Ti, i = 1, 2,..., m. For i = 1, 2,..., m, let eui be the excentricity of ui in Ti and ec = max{eui : i = 1, 2 , m}. Let κ = ec+1. Forj = 1,2,...,k- 1, let δij = max{dv : dist(v, ui) = j,v ∈ Ti}, δj = max{δij : i = 1, 2,..., m}, δ0 = max{dui : ui ∈ V(Cm)}. Then λ1(G)≤max{max 2≤j≤k-2 (√δj-1-1+√δj-1),2+√δ0-2,√δ0-2+√δ1-1}. If G ≌ Cn, then the equality holds, where λ1 (G) is the largest eigenvalue of the adjacency matrix of G. 相似文献
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电子邮件将成为人们的主要通信手段之一。正如Internet网的管理人员指出的那样,国际大网Internet自开通后最为活跃的服务项目一直都是电子邮件。 相似文献
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介绍了为KENOⅣ配制的交互绘图功能的有关内容,说明了用户界面,几何可视化,Keff结果图,。运行进程显示等功能。 相似文献
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人们在观察外部世界时眼睛总是与其它人体活动自然协调地工作,并且眼动所需的认知负荷很低,人眼的注视包含着当前的任务状况以及人的内部状态等信息,因此眼注视是一种非常好的能使人机对话变得简便、自然的候选输入通道.本文介绍了视线跟踪的基本手段、方法和技术,对视线跟踪作为人机交互通道所具有的特点进行了讨论,并指出了其在人机交互领域中的应用及前景. 相似文献
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LIU Mu-huo LIU Bo-lian 《高校应用数学学报(英文版)》2009,24(2)
A λ harmonic graph G, a λ-Hgraph G for short, means that there exists a constant denotes the degree of vertex vi. In this paper, some harmonic properties of the complement and line graph are given, and some algebraic properties for the λ-Hgraphs are obtained. 相似文献
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A λ harmonic graph G, a λ-Hgraph G for short, means that there exists a constant A such that the equality λd(ui) = ∑(vi,vj)∈E(G) d(vj) holds for all i = 1, 2,…, |V(G)|, where d(vi) denotes the degree of vertex vi. In this paper, some harmonic properties of the complement and line graph are given, and some algebraic properties for the λ-Hgraphs are obtained. 相似文献