运用Leray-Schauder度理论和不动点定理获得了两端固定支撑边界条件下四阶变系数常微分系统固结梁边值问题{ u(4)(x)+a(x)u(x)=f1(x,v(x)), x∈(0,1),v(4)(x)+b(x)v(x)=f2(x,u(x)), x∈(0,1),u(0)=u(1)=u′(0)=u′(1)=0,v(0)=v(1)=v′(0...运用Leray-Schauder度理论和不动点定理获得了两端固定支撑边界条件下四阶变系数常微分系统固结梁边值问题{ u(4)(x)+a(x)u(x)=f1(x,v(x)), x∈(0,1),v(4)(x)+b(x)v(x)=f2(x,u(x)), x∈(0,1),u(0)=u(1)=u′(0)=u′(1)=0,v(0)=v(1)=v′(0)=v′(1)=0正解的存在性和唯一性,其中a,b:[ 0,1 ]→[ 0,+∞ )连续,非线性项fi:[ 0,1 ]×R→R为连续函数且fi(x,0)≥0 (i=1,2)。The existence and uniqueness of positive solution for the boundary value problem of fourth order variable coefficients ordinary differential system{ u(4)(x)+a(x)u(x)=f1(x,v(x)), x∈(0,1),v(4)(x)+b(x)v(x)=f2(x,u(x)), x∈(0,1),u(0)=u(1)=u′(0)=u′(1)=0,v(0)=v(1)=v′(0)=v′(1)=0with clamped beam conditions were obtained using Leray-Schauder degree theory and fixed point theorem, where a,b:[ 0,1 ]→[ 0,+∞ )are continuous, nonlinear term fi:[ 0,1 ]×R→Rare continuous and fi(x,0)≥0 (i=1,2).展开更多
This paper deals with a coupled system of fourth-order parabolic inequalities ｜u｜t ≥ -△2^u＋｜v｜^q, ｜v｜t ≥-△2v＋｜u｜p^ in S=R^n ×R^＋ withp, q 〉 1, n ≥1. AFujita- Liouville type theorem is establishe...This paper deals with a coupled system of fourth-order parabolic inequalities ｜u｜t ≥ -△2^u＋｜v｜^q, ｜v｜t ≥-△2v＋｜u｜p^ in S=R^n ×R^＋ withp, q 〉 1, n ≥1. AFujita- Liouville type theorem is established that the inequality system does not admit nontrivial nonnegative global solutions on S whenever n/4≤ max（ p＋1/pq-1, q＋1/pq-1 ）. Since the general maximum-comparison principle does not hold for the fourth-order problem, the authors use the test function method to get the global non-existence of nontrivial solutions.展开更多
文摘运用Leray-Schauder度理论和不动点定理获得了两端固定支撑边界条件下四阶变系数常微分系统固结梁边值问题{ u(4)(x)+a(x)u(x)=f1(x,v(x)), x∈(0,1),v(4)(x)+b(x)v(x)=f2(x,u(x)), x∈(0,1),u(0)=u(1)=u′(0)=u′(1)=0,v(0)=v(1)=v′(0)=v′(1)=0正解的存在性和唯一性,其中a,b:[ 0,1 ]→[ 0,+∞ )连续,非线性项fi:[ 0,1 ]×R→R为连续函数且fi(x,0)≥0 (i=1,2)。The existence and uniqueness of positive solution for the boundary value problem of fourth order variable coefficients ordinary differential system{ u(4)(x)+a(x)u(x)=f1(x,v(x)), x∈(0,1),v(4)(x)+b(x)v(x)=f2(x,u(x)), x∈(0,1),u(0)=u(1)=u′(0)=u′(1)=0,v(0)=v(1)=v′(0)=v′(1)=0with clamped beam conditions were obtained using Leray-Schauder degree theory and fixed point theorem, where a,b:[ 0,1 ]→[ 0,+∞ )are continuous, nonlinear term fi:[ 0,1 ]×R→Rare continuous and fi(x,0)≥0 (i=1,2).
基金supported by the National Natural Science Foundation of China (Nos. 10771024,11171048)the Fundamental Research Funds for the Central Universities (No. 851011)
文摘This paper deals with a coupled system of fourth-order parabolic inequalities ｜u｜t ≥ -△2^u＋｜v｜^q, ｜v｜t ≥-△2v＋｜u｜p^ in S=R^n ×R^＋ withp, q 〉 1, n ≥1. AFujita- Liouville type theorem is established that the inequality system does not admit nontrivial nonnegative global solutions on S whenever n/4≤ max（ p＋1/pq-1, q＋1/pq-1 ）. Since the general maximum-comparison principle does not hold for the fourth-order problem, the authors use the test function method to get the global non-existence of nontrivial solutions.
