共查询到20条相似文献,搜索用时 20 毫秒
1.
MOUSSAOUI Abdelkrim KHODJA Brahim 《偏微分方程(英文版)》2009,22(2):111-126
In this paper, we study the existence of nontrivial solutions for the problem
{-△u=f(x,u,v)+h1(x)in Ω
-△v=g(x,u,v)+h2(x)inΩ
u=v=0 onδΩ
where Ω is bounded domain in R^N and h1,h2 ∈ L^2 (Ω). The existence result is obtained by using the Leray-Schauder degree under the following condition on the nonlinearities f and g:
{lim s,|t|→+∞f(x,s,t)/s=lim |s|,t→+∞g(x,s,t)/t=λ+1 uniformly on Ω,
lim -s,|t|→+∞f(x,s,t)/s=lim |s|,-t→+∞g(x,s,t)/t=λ-,uniformly on Ω,
where λ+,λ-∈(0)∪σ(-△),σ(-△)denote the spectrum of -△. The cases (i) where λ+ = λ_ and (ii) where λ+≠λ_ such that the closed interval with endpoints λ+,λ_ contains at most one simple eigenvatue of -△ are considered. 相似文献
{-△u=f(x,u,v)+h1(x)in Ω
-△v=g(x,u,v)+h2(x)inΩ
u=v=0 onδΩ
where Ω is bounded domain in R^N and h1,h2 ∈ L^2 (Ω). The existence result is obtained by using the Leray-Schauder degree under the following condition on the nonlinearities f and g:
{lim s,|t|→+∞f(x,s,t)/s=lim |s|,t→+∞g(x,s,t)/t=λ+1 uniformly on Ω,
lim -s,|t|→+∞f(x,s,t)/s=lim |s|,-t→+∞g(x,s,t)/t=λ-,uniformly on Ω,
where λ+,λ-∈(0)∪σ(-△),σ(-△)denote the spectrum of -△. The cases (i) where λ+ = λ_ and (ii) where λ+≠λ_ such that the closed interval with endpoints λ+,λ_ contains at most one simple eigenvatue of -△ are considered. 相似文献
2.
定理:在△ABC中,A1、B1、C1分别是直线BC、CQ、AB上的点,且有→AC1=→λC1B,→BA1=μ→A2C,→CB1=t→B1A,则△A1 B1 C1与△ABC有相同重心的充要条件是λ=μ=t,其中λ、μ、t均是不为-1的实数.…… 相似文献
3.
性质1 如图1,在△PAB中,M是边AB上任意一点,Q是PM上的任意一点,过点Q的任意一条直线交边PA,PB于A′,B′,若→AM=λ→AB,→PQ=t→PM,→PA′=x→PA,→PB′=y→PB,则1-λ/x+λ/y=1/t. 相似文献
4.
5.
文[1]从2004年全国高中数学联合竞赛试题第四题出发,通过对问题的进一步探索推广得到下列结论:设点O在△ABC内部,且λ→↑OA+m→↑OB+n→↑OC=0,(其中λ,m,n均是正数)。则S△AOB:S△BOC:S△AOC=1/λm:1/mn:1/nλ,文[2]利用向量的几何意义对上述结论给出了较为简捷的证明。 相似文献
6.
7.
Joseph A. Iaia 《偏微分方程(英文版)》2010,(1):33-67
We study capillary spreadings of thin films of liquids of power-law rheology. These satisfy ut+(u^λ+2|uxxx|^λ-1uxxx)x=0,where u (x, t) represents the thickness of the one-dimensional liquid and λ 〉 1. We look for traveling wave solutions so that u(x,t) =g(x+ct) and thus g satisfies g'''=|g-ε|^1/λ/g^1+2/λ sgn(g-ε) We show that for each ε 〉 0 there is an infinitely oscillating solution, gε, such that limt→∞ gε=ε and that gε→ g0 as ε → O, where g0≡ 0 for t ≥ 0 and g0=cλ|t|3λ/2λ+1 for t〈0 for some constant cλ. 相似文献
8.
文[1]给出了三角形的一个简捷的性质:
已知ΔABC及其内部一点P,若λ1PA+λ2PB+λ3 PC=0,λ1,λ2,λ3都是大于0的实数,则△PBC,△PAC,△PAB的面积之比为λ1:λ2:λ3. 相似文献
9.
问题 已知G是正△ABC的重心,过G的直线分别与边AB、AC交于E、F,记→AB=a,→AC=b,并令→AE=λa,→AF=μb(如图1),求证:1/λ+1/μ为定值. 相似文献
10.
两个三角形垂心相同的充要条件 总被引:1,自引:0,他引:1
在非直角三角形ABC中,A1,B1,C1分别是直线BC,CA,AB上的点,且满足:AC1=λC1B,BA1=μA1C,CB1=t B1A,其中λ,μ,t均不为-1.图1如图1,设∠A,∠B,∠C所对的边分别为a,b,c,下面我们来讨论△ABC与△A1B1C1有相同垂心的充要条件.不妨设点H为△ABC的垂心,则有BH·AC=0,CH·AB=0.因此BH·AB=(BC CH)·AB=BC·AB.由于A1H=BH-BA1=BH-1 μμBC,B1C1=AC1-AB1=1 λλAB-11 tAC,所以A1H·B1C1=(BH-1 μμBC)·(1 λλAB-1 1tAC)=1 λλBH·AB-(1 λ)λ(μ1 μ)BC·AB-11 tBH·AC (1 μ)μ(1 t)BC·AC=1 λλBC… 相似文献
11.
2005年湖南省高考数学试题(理10):设P是ΔAPC内任意一点,S△ABC表示△ABC面积,λ1=S△PBC/S△ABC,λ2=S△PAB/S△ABC,定义f(P)=(λ1,λ2,λ3),若G是△ABC的重心,f(Q)=(1/2,1/3,1/6),则( ) 相似文献
12.
要设(Mn,go)(n奇数)是紧Riemannian流形,λ(go)〉0,这里λ(go)是算子-4△go+R(go)的第一特征值,R(go)是(Mn,go)的数量曲率.设以(Mn,go)为初值的规范化的Ricci流的极大解g(t)满足|R(g(t))|≤C和λ(对某个常数C一致成立).我们证明这个解有子列收敛于一个Ricci收缩孤立子.进一步,当n=3时,条件fM |Rm(g(t))+n/2dμt ≤ C可去. 相似文献
13.
经典的M/M/1随机服务系统的排队方程是{G_0~'(t)=-λG_0(t)+μG_1(t),G_k~'(t)=λG_(k-1)(t)-(λ+μ)G_k(t)+μG_(k+1)(t),k=1,2,…,其中G_k(t)表示在时刻t系统内恰有k个顾客的概率.在一般初始条件下方程(1)的解已由Clarke用母函数方法求出:G_k(t)=e~(-(λ+μ)t)[(λ/μ)~(k/2)I_k(2t(λμ~(1/2))+(λ/μ)~((k-1)/2)I_(k+1)(2t(λμ~(1/2)) 相似文献
14.
In this paper, we study how the shape of the graph of a(z) affects on the number of positive solutions of -△v+μb(z)v=a(z)vp-1+λh(z)vq-1,inRN.(0.1) We prove for large enough λ,μ〉 0, there exist at least k+ 1 positive solutions of the this semilinear elliptic equations where 1 ≤ q 〈 2 〈 p 〈 2* = 2N/(N-2) forN ≥ 3. 相似文献
15.
The authors consider the semilinear SchrSdinger equation
-△Au+Vλ(x)u= Q(x)|u|γ-2u in R^N,
where 1 〈 γ 〈 2* and γ≠ 2, Vλ= V^+ -λV^-. Exploiting the relation between the Nehari manifold and fibrering maps, the existence of nontrivial solutions for the problem is discussed. 相似文献
-△Au+Vλ(x)u= Q(x)|u|γ-2u in R^N,
where 1 〈 γ 〈 2* and γ≠ 2, Vλ= V^+ -λV^-. Exploiting the relation between the Nehari manifold and fibrering maps, the existence of nontrivial solutions for the problem is discussed. 相似文献
16.
Chang Xing MIAO You Bin ZHU 《数学学报(英文版)》2008,24(1):17-26
The authors consider the well-posedness in energy space of the critical non-linear system of wave equations with Hamiltonian structure{utt-△u=-F1(|u|^2,|v|^2)u,utt-△u=-F2(|u|^2,|v|^2)u where there exists a function F(λ,μ) such that δF(λ,μ)/δλ=F1(λ,μ).δF(λ,μ)/δμ=F2(λ,μ) By showing that the energy and dilation identities hold for weak solution under some assumptions on the non-linearities, we prove the global well-posedness in energy space by a similar argument to that for global regularity as shown in "Shatah and Struwe's paper, Ann. of Math. 138, 503-518 (1993)". 相似文献
17.
新人教必修4第二章平面向量:已知A、B是直线L上任意两点,O是L外一点,则对直线L上任意一点P,存在实数t,使O→P关于基底{O→A,O→B}的分解式为O→P=(1-t)O→A+tOB→,此向量等式叫做直线L的向量参数方程式,其中实数t叫做参数,并且满足A→P=tAB→.若点P是平面内任意一点,向量O→P关于基底{O→A,O→B}的分解式为O→P=→λOA+B→μO,当λ+μ=1时,点P在直线L上,当λ+μ≠1时,点P在哪?就这个问题做一下探讨,供参考. 相似文献
18.
If the second order problem u(t) + Bu(t) + Au(t) = f(t), u(0) =u(0) = 0 has L^p-maximal regularity, 1 〈 p 〈 ∞, the analyticity of the corresponding propagator of the sine type is shown by obtaining the estimates of ‖λ(λ^2 + λB + A)^-1‖ and ‖B(λ^2 + λB + A)^-1‖ for λ∈ C with Reλ 〉 ω, where the constant ω≥ 0. 相似文献
19.
获得了脉冲Hematopoiesis模型{Q(t)=-c(t)Q(t)-α(t)Q(t)/1+Q(t)+β(t)∫^τ0F(u)Q(t-u)/1+Q(t-u)ds △Q(tk)=αk(t)Q(t)k+bk(t) 概周期解的存在性与指数稳定性. 相似文献
20.
本文考虑一类带调和势的非线性Schrodinger方程iψt=-△ψ+|x|2ψ-μ|ψ|p-1ψ-λ|ψ|q-1ψ,x∈RN,t≥0,其中μ>0,λ>0.当N=1,2时,1<p<q<∞;当N≥3时,1<p<q<N+2/N-2.运用精巧的变分方法、势井方法和凸方法,得到了方程的整体解和爆破解存在的门槛.进一步回答了当q>p>1+4/N时,方程的Cauchy问题的初值小到什么程度,其整体解存在?. 相似文献