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The Existence of Solutions for Kirchhoff-Type Equations with General Singular Terms
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作者 WANG Ji-nan SUN Da-wei 《Chinese Quarterly Journal of Mathematics》 2024年第3期315-323,共9页
We study the existence of solutions for Kirchhoff-type equations.Firstly,we use the Sobolev inequality and the weakly lower semi-continuity of the norm to prove that the corresponding function can reach the global min... We study the existence of solutions for Kirchhoff-type equations.Firstly,we use the Sobolev inequality and the weakly lower semi-continuity of the norm to prove that the corresponding function can reach the global minimum.Then,we use the variational method and some analytical techniques to obtain the existence of the positive solution of the equation whenλis small enough. 展开更多
关键词 kirchhoff-type equation The existence Positive solution Variational method
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THE EXISTENCE AND CONCENTRATION OF GROUND STATE SIGN-CHANGING SOLUTIONS FOR KIRCHHOFF-TYPE EQUATIONS WITH A STEEP POTENTIAL WELL 被引量:1
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作者 吴梦慧 唐春雷 《Acta Mathematica Scientia》 SCIE CSCD 2023年第4期1781-1799,共19页
In this paper,we consider the nonlinear Kirchhoff type equation with a steep potential well−(a+b∫_(R)^(3)|∇u|^(2 )dx)Δu+λV(x)u=f(u)in R^(3),where a,b>0 are constants,λ is a positive parameter,V∈C(R3,R)is a ste... In this paper,we consider the nonlinear Kirchhoff type equation with a steep potential well−(a+b∫_(R)^(3)|∇u|^(2 )dx)Δu+λV(x)u=f(u)in R^(3),where a,b>0 are constants,λ is a positive parameter,V∈C(R3,R)is a steep potential well and the nonlinearity f∈C(R,R)satisfies certain assumptions.By applying a signchanging Nehari manifold combined with the method of constructing a sign-changing(PS)C sequence,we obtain the existence of ground state sign-changing solutions with precisely two nodal domains when λ is large enough,and find that its energy is strictly larger than twice that of the ground state solutions.In addition,we also prove the concentration of ground state sign-changing solutions. 展开更多
关键词 kirchhoff-type equation ground state sign-changing solutions steep potential well
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The stationary phase analysis of the Kirchhoff-type d emigrated field 被引量:2
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作者 孙建国 《Applied Geophysics》 SCIE CSCD 2010年第1期18-30,98,共14页
In the literature,stationary phase analysis of Kirchhoff-type demigrated fields is carried out mainly under the following two conditions:(1) The considered isochrone and the target reflector are tangential to each ... In the literature,stationary phase analysis of Kirchhoff-type demigrated fields is carried out mainly under the following two conditions:(1) The considered isochrone and the target reflector are tangential to each other;(2) The spatial duration of the wavelet of the depthmigrated image is short.For the isochrones that are not tangential to the target reflector and for the depth-migrated images that have a large spatial duration,the published stationary phase equation for the demigrated field will become invalid.For performing the stationary phase analysis of the Kirchhoff-type demigrated field under the conditions that the considered isochrone and the target reflector are not tangential to each other and that the spatial duration of the wavelet of the depth-migrated image is not short(the general conditions),I derive the formulas for the factors appearing in the stationary phase formula in two dimensions,from which I find that for different isochrones the horizontal coordinates of the stationary point of the depth difference function are different.Also,the equation for the Kirchhoff-type demigrated field consists of two parts.One is the true-amplitude demigrated signal and the other is the amplitude distortion factor.From these facts the following two conclusions can be drawn:(1) A demigrated signal is composed of many depth-migrated images and one depth-migrated image trace provides only one sample to the demigrated signal;and(2) The amplitude distortion effect is an effect inherent in the Kirchhoff-type demigration and cannot be eliminated during demigration.If this effect should be eliminated,one should do an amplitude correction after demigration. 展开更多
关键词 kirchhoff-type demigration stationary phase analysis amplitude distortion
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The Estimates of the Upper Bounds of Hausdorff Dimensions for the Global Attractor for a Class of Nonlinear Coupled Kirchhoff-Type Equations 被引量:3
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作者 Guoguang Lin Ming Zhang 《Advances in Pure Mathematics》 2018年第1期1-10,共10页
This paper deals with the Hausdorff dimensions of the global attractor for a class of Kirchhoff-type coupled equations with strong damping and source terms. We obtain a precise estimate of upper bound of Hausdorff dim... This paper deals with the Hausdorff dimensions of the global attractor for a class of Kirchhoff-type coupled equations with strong damping and source terms. We obtain a precise estimate of upper bound of Hausdorff dimension of the global attractor. 展开更多
关键词 kirchhoff-type EQUATIONS The Global Attractor HAUSDORFF Dimension
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Hausdorff Dimension and Fractal Dimension of the Global Attractor for the Higher-Order Coupled Kirchhoff-Type Equations 被引量:4
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作者 Guoguang Lin Sanmei Yang 《Journal of Applied Mathematics and Physics》 2017年第12期2411-2424,共14页
This paper mainly deals with the higher-order coupled Kirchhoff-type equations with nonlinear strong damped and source terms in a bounded domain. We obtain some results that are estimation of the upper bounds of Hausd... This paper mainly deals with the higher-order coupled Kirchhoff-type equations with nonlinear strong damped and source terms in a bounded domain. We obtain some results that are estimation of the upper bounds of Hausdorff dimension and Fractal dimension of the global attractor. 展开更多
关键词 HIGHER-ORDER COUPLED kirchhoff-type EQUATIONS Source Term Hausdorff DIMENSION Fractal DIMENSION Nonlinear Dissipation
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Random Attractors for the Kirchhoff-Type Suspension Bridge Equations with Strong Damping and White Noises 被引量:4
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作者 Chuangliang Qin Jinji Du Guoguang Lin 《International Journal of Modern Nonlinear Theory and Application》 2017年第4期134-147,共14页
In this paper, we investigate the existence of random attractor for the random dynamical system generated by the Kirchhoff-type suspension bridge equations with strong damping and white noises. We first prove the exis... In this paper, we investigate the existence of random attractor for the random dynamical system generated by the Kirchhoff-type suspension bridge equations with strong damping and white noises. We first prove the existence and uniqueness of solutions to the initial boundary value conditions, and then we study the existence of the global attractors of the equation. 展开更多
关键词 kirchhoff-type SUSPENSION Bridge Equations RANDOM ATTRACTORS RANDOM DYNAMICAL System
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The Inertial Manifolds for a Class of Higher-Order Coupled Kirchhoff-Type Equations 被引量:3
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作者 Guoguang Lin Sanmei Yang 《Journal of Applied Mathematics and Physics》 2018年第5期1055-1064,共10页
In this paper, we mainly deal with a class of higher-order coupled Kirch-hoff-type equations. At first, we take advantage of Hadamard’s graph to get the equivalent form of the original equations. Then, the inertial m... In this paper, we mainly deal with a class of higher-order coupled Kirch-hoff-type equations. At first, we take advantage of Hadamard’s graph to get the equivalent form of the original equations. Then, the inertial manifolds are proved by using spectral gap condition. The main result we gained is that the inertial manifolds are established under the proper assumptions of M(s) and gi(u,v), i=1, 2. 展开更多
关键词 HIGHER-ORDER COUPLED kirchhoff-type EQUATIONS Inertial MANIFOLD Hadamard’s Graph Spectral Gap Condition
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On the Exponential Decay of Solutions for Some Kirchhoff-Type Modelling Equations with Strong Dissipation 被引量:1
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作者 Yaojun Ye 《Applied Mathematics》 2010年第6期529-533,共5页
This paper deals with the initial boundary value problem for a class of nonlinear Kirchhoff-type equations with strong dissipative and source terms in a bounded domain, where and are constants. We obtain the global ex... This paper deals with the initial boundary value problem for a class of nonlinear Kirchhoff-type equations with strong dissipative and source terms in a bounded domain, where and are constants. We obtain the global existence of solutions by constructing a stable set in and show the energy exponential decay estimate by applying a lemma of V. Komornik. 展开更多
关键词 kirchhoff-type Equation Initial Boundary Value Problem Stable Set EXPONENTIAL DECAY ESTIMATE
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Implementation technology of Kirchhoff demigration 被引量:1
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作者 XU Yangyang SUN Jianguo +3 位作者 SUN Hui SUN Huiqiu JIANG Panpan ZHAO Sihang 《Global Geology》 2015年第4期252-257,共6页
Demigration refers to directly applying a specific imaging technique to a migrated section. It is applied primarily to seismic data mapping. In a previous research study, a time-efficient implementation technology of ... Demigration refers to directly applying a specific imaging technique to a migrated section. It is applied primarily to seismic data mapping. In a previous research study, a time-efficient implementation technology of demigration was expounded. In the present study, the Fast Marching Method (FMM) used for traveltime computation in the isochrone-staek demigration, is developed. Furthermore, other key techniques ( such as selection of aperture and antialiasing filtering factor) are analyzed in detail. Besides, the detail implementation method and program flow are given, which is shown their good computational efficiency and high-quality demi- gration effect. This implementation technique is illustrated with both the V(z) model and Marmousi model. It provides a basic method for implementing demigration in the application of seismic data mapping. 展开更多
关键词 demigration travel-time computation APERTURE antialiasing
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Internal Multiple Prediction Based on Imaging Profile Prediction and Kirchhoff Demigration
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作者 QIU Binhuang TAN Jun +6 位作者 DAN Zhiwei YU Jiashun YAN Hongyan LIU Baohua YU Kaiben SONG Peng XIE Chuang 《Journal of Ocean University of China》 SCIE CAS CSCD 2019年第6期1360-1370,共11页
This paper introduces an internal multiple prediction method based on imaging profile prediction and Kirchhoff demigration.First,based on an inputted prestack time migration profile,the method predicts the prestack ti... This paper introduces an internal multiple prediction method based on imaging profile prediction and Kirchhoff demigration.First,based on an inputted prestack time migration profile,the method predicts the prestack time migration profile that only includes internal multiples by inverse scattering series method.Second,the method uses velocity-weighted Kirchhoff demigration to create shot gathers that contains only internal multiples.Internal multiple prediction based on the prestack time migration profile effectively reduces the computational cost of multiple predictions,and the internal-multiple shot gathers created by Kirchhoff demigration remarkably reduces the complexity of the practical problem.Internal multiple elimination can be conducted through the combined adaptive multiple subtraction based on event tracing.Synthetic and field data tests show that the method effectively predicts internal multiples and possesses considerable potential in field data processing,particularly in areas where internal multiples develop seriously. 展开更多
关键词 INTERNAL MULTIPLE PREDICTION inverse scattering series method KIRCHHOFF demigration KIRCHHOFF PRESTACK time migration
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Nodal Solution for a Kirchhoff-Type Problem in R<sup><i>N</i></sup>
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作者 Leilei Sha 《Applied Mathematics》 2020年第1期42-52,共11页
In this paper, we study the existence of nodal solutions of the following general Sch&#246;dinger-Kirchhoff type problem: where a,b > 0, N ≥ 3, g : R → R+ is an even differential function and g''(s) ... In this paper, we study the existence of nodal solutions of the following general Sch&#246;dinger-Kirchhoff type problem: where a,b > 0, N ≥ 3, g : R → R+ is an even differential function and g''(s) ≥ 0 for all s ≥ 0, h : R → R is an odd differential function. These equations are related to the generalized quasilinear Sch&#246;dinger equations: Because the general Sch&#246;dinger-Kirchhoff type problem contains the nonlocal term, it implies that the equation (KP1) is no longer a pointwise identity and is very different from classical elliptic equations. By introducing a variable replacement, we first prove that (KP1) is equivalent to the following problem: whereand G-1 is the inverse of G. Next, we prove that (KP2) is equivalent to the following system with respect to : For every integer k > 0, radial solutions of (KP1) with exactly k nodes are obtained by dealing with the system (S) under some appropriate assumptions. Moreover, this paper established the nonexistence results if N ≥ 4 and b is sufficiently large. 展开更多
关键词 Sign-Changing Solutions NONLOCAL Operator kirchhoff-type Equations
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Boundary Stabilization of a More General Kirchhoff-Type Beam Equation
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作者 Jianwen Zhang Danxia Wang 《International Journal of Modern Nonlinear Theory and Application》 2012年第3期97-101,共5页
Simultaneously, considering the viscous effect of material, damping of medium, geometrical nonlinearity, physical nonlinearity, we set up a more general equation of beam subjected to axial force and external load. We ... Simultaneously, considering the viscous effect of material, damping of medium, geometrical nonlinearity, physical nonlinearity, we set up a more general equation of beam subjected to axial force and external load. We prove the existence and uniqueness of global solutions under non-linear boundary conditions which the model is added one damping mechanism at l end. What is more, we also prove the exponential decay property of the energy of above mentioned system. 展开更多
关键词 kirchhoff-type Beam NON-LINEAR Boundary Global Solutions EXPONENTIAL DECAY
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A Family of the Inertial Manifolds for a Class of Generalized Kirchhoff-Type Coupled Equations
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作者 Guoguang Lin Jiaying Zhou 《Open Journal of Applied Sciences》 CAS 2022年第7期1116-1127,共12页
The paper considers the long-time behavior for a class of generalized high-order Kirchhoff-type coupled equations, under the corresponding hypothetical conditions, according to the Hadamard graph transformation method... The paper considers the long-time behavior for a class of generalized high-order Kirchhoff-type coupled equations, under the corresponding hypothetical conditions, according to the Hadamard graph transformation method, obtain the equivalent norm in space , and we obtain the existence of a family of the inertial manifolds while such equations satisfy the spectral interval condition. 展开更多
关键词 kirchhoff-type Coupled Equations Spectral Interval Condition A Family of the Inertial Manifolds
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基于弹性反射波正演表达的转换波逆时偏移与反偏移
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作者 丁超 马坚伟 《地球物理学报》 SCIE EI CAS CSCD 北大核心 2024年第9期3496-3509,共14页
针对线性化弹性反射波方程无法直接用于弹性转换波反偏移模拟的问题,本文提出基于高频近似的一次反射波模拟新方法.该方法基于地震波传播的散射理论,先对地下速度扰动的空间变化进行高频近似,再基于散射波传播方程推导得到线性化一次反... 针对线性化弹性反射波方程无法直接用于弹性转换波反偏移模拟的问题,本文提出基于高频近似的一次反射波模拟新方法.该方法基于地震波传播的散射理论,先对地下速度扰动的空间变化进行高频近似,再基于散射波传播方程推导得到线性化一次反射波传播方程.基于弹性反射地震数据表达,本文采用线性算子的伴随估计反射系数,实现反射波逆时偏移.根据该线性表达,联合背景速度和成像值来模拟一次反射横波传播,实现了弹性波角度域反偏移,并进一步导出成像值关于波速的梯度.数值实验表明,基于弹性反射地震数据表达的偏移成像方法,既克服了极性反转效应,又使成像结果包含了更为丰富的反射角信息;一次反射波模拟方法获得的弹性地震数据具有较高的精度和稳定性,得到的弹性波场的振幅和相位信息与理论解析解吻合较好,有效保证了成像域层析速度反演梯度的稳定求解. 展开更多
关键词 弹性波动方程 反射波 转换波逆时偏移 逆散射成像条件 高频近似 角度域反偏移
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基于点扩散函数的图像学高分辨率技术
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作者 陶永慧 白英哲 《石油物探》 CSCD 北大核心 2024年第3期548-557,共10页
常规基于一维假设的高分辨率处理技术如反褶积、反Q滤波方法等,针对水平构造或者小倾角构造有较好的处理效果,但在面向高陡构造或者断裂等复杂构造时处理效果不佳。而偏移成像结果可以看作是点扩散函数(PSF)与真实反射系数褶积的结果,... 常规基于一维假设的高分辨率处理技术如反褶积、反Q滤波方法等,针对水平构造或者小倾角构造有较好的处理效果,但在面向高陡构造或者断裂等复杂构造时处理效果不佳。而偏移成像结果可以看作是点扩散函数(PSF)与真实反射系数褶积的结果,高维空间条件下的高分辨率处理技术实际上是此正演问题的一个反问题,即基于成像结果进行反射系数反演。为此,提出了一种基于点扩散函数的高分辨率处理技术,首先基于点扩散函数的计算原理,推导出了基于高频近似条件下的快速求解算法,并在高维空间褶积理论的指导下结合图像学反演算法研发了纯数据驱动的点扩散函数提取技术,最后采用高维空间反褶积算法求得高分辨率成像结果,实现地震频带的有效拓宽和成像分辨率的提升。模型数据和实际数据测试结果表明,该算法可在不损失低频的前提下有效扩宽高频,且具有在计算效率与常规高分辨率算法基本相当的条件下有效提高不同展布方位地质体分辨率的优势。 展开更多
关键词 高陡构造 高分辨率处理 点扩散函数 高维空间反褶积 偏移反偏移 逆时偏移 图像学反演算法
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活动断层地震勘探中的高精度偏移与反偏移技术
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作者 张扬 李稳 《Applied Geophysics》 SCIE CSCD 2023年第2期198-208,241,242,共13页
为了进一步发展活动断层空间位置和精细结构探查技术,解决在活动断层探测地震数据处理过程中,缺少一种通过数学手段对地震成像结果进行可靠性评价的问题,开展了将‘反偏移’这一地震波偏移成像的逆运算引入活动断层探测地震数据处理的... 为了进一步发展活动断层空间位置和精细结构探查技术,解决在活动断层探测地震数据处理过程中,缺少一种通过数学手段对地震成像结果进行可靠性评价的问题,开展了将‘反偏移’这一地震波偏移成像的逆运算引入活动断层探测地震数据处理的研究。分析了偏移与反偏移的关系,提出了以叠前深度域逆时偏移和波动方程反偏移为核心的主动源地震勘探数据高精度处理流程。选择了生长断层、花状构造等有代表性的复杂断裂构造实际探测数据进行处理。处理结果表明,利用本文提出的以波动方程逆时偏移和反偏移为核心的地震数据处理流程,能够有效提高活动断层地震成像剖面的可靠性和精确度。通过本次研究可以认为将偏移和反偏移这一对严格对应的地震数据处理算子引入活动断层探测领域,有助于推动活动断层探测精确度和分辨力的提升。尤其是在开展钻孔联合地质剖面探测或科学钻探研究时,应用本文方法进行地震勘探数据高精度成像处理,利用多种数学手段相互检验,能够有效确保断层上断点定位准确,节约钻探成本。 展开更多
关键词 活动断层地震勘探 叠前深度偏移 反偏移 地震 波速度建模 主动源地震成像
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An Approximate Analytical Method for a Slot Ring Radome
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作者 Kang Luo Jin Meng +1 位作者 Jiangfeng Han Danni Zhu 《Engineering》 SCIE EI CAS CSCD 2023年第11期75-82,共8页
In this paper,an in-band and out-of-band microwave wireless power-transmission characteristic analysis of a slot ring radome based on an approximate analytical method is proposed.The main contribution of this paper is... In this paper,an in-band and out-of-band microwave wireless power-transmission characteristic analysis of a slot ring radome based on an approximate analytical method is proposed.The main contribution of this paper is that,in the approximate analysis of the ring radome,a unified expression of the incident field on the radome surface is derived with E-plane and H-plane scanning,and the ring is approximated as 30 segments of straight strips.Solving the corresponding 60×60 linear equations yields the electric current distribution along the ring strip.The magnetic current along the complementary slot ring is obtained by duality.Thanks to the fully analytical format of the current distribution,the microwave wireless power-transmission characteristics are efficiently calculated using Munk’s scheme.An example of a slot ring biplanar symmetric hybrid radome is used to verify the accuracy and efficiency of the proposed scheme.The central processing unit(CPU)time is about 690 s using Ansys HFSS software versus 2.82 s for the proposed method. 展开更多
关键词 Approximate analytical RING RADOME kirchhoff-type circuit
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Kirchhoff-Type Problem with Mixed Boundary Condition in a Variable Exponent Sobolev
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作者 Junichi Aramaki 《Communications in Mathematical Research》 CSCD 2023年第4期539-574,共36页
.In this paper,we consider a mixed boundary value problem for the stationary Kirchhoff-type equation containing p(-)-Laplacian.More precisely,we are concerned with the problem with the Dirichlet condition on a part of... .In this paper,we consider a mixed boundary value problem for the stationary Kirchhoff-type equation containing p(-)-Laplacian.More precisely,we are concerned with the problem with the Dirichlet condition on a part of the boundary and the Steklov boundary condition on an another part of the boundary.We show the existence of at least one,two or infinitely many non-trivial weak solutions according to hypotheses on given functions. 展开更多
关键词 kirchhoff-type problem mixed boundary value problem p(-)-Laplacian type equation weak solutions
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基于F-K偏移和反偏移的地震道插值方法研究 被引量:15
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作者 李学聪 刘伊克 +2 位作者 常旭 金德刚 张恒超 《地球物理学进展》 CSCD 北大核心 2009年第6期2020-2029,共10页
野外采集的地震数据经常存在空道或者坏道的情况,为了满足地震数据处理精度的要求,就必须首先进行插值.本文提出了一种新的地震数据插值方法:F-K偏移和反偏移插值法,该方法是通过F-K偏移和反偏移的串联使用来实现的.与其他的插值方法相... 野外采集的地震数据经常存在空道或者坏道的情况,为了满足地震数据处理精度的要求,就必须首先进行插值.本文提出了一种新的地震数据插值方法:F-K偏移和反偏移插值法,该方法是通过F-K偏移和反偏移的串联使用来实现的.与其他的插值方法相比,这种插值方法的优点在于计算速度快,没有经过近似处理,精度高.F-K偏移/反偏移能够实现道插值的原理和Kirchhoff偏移/反偏移插值方法类似,也是由于数据是有限带宽的原因引起的.通过对模型的试算,可以看到F-K偏移和反偏移插值方法有着比较好的插值效果,是一种高效、准确、可行的方法. 展开更多
关键词 F—K偏移 F-K反偏移 映射 倏逝波
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基于Kirchhoff偏移/反偏移的随机噪声压制方法 被引量:3
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作者 杨庆道 蒋兵 +1 位作者 岳玉波 郭朝斌 《石油物探》 EI CSCD 北大核心 2013年第5期530-536,444,共7页
不同于传统的信号域随机噪声压制方法,Kirchhoff叠前时间偏移/反偏移是一种基于地震数据映射的随机噪声压制方法。该方法一方面利用数据映射算子的共轭特性,保证了有效信号在偏移/反偏移处理后的良好恢复;另一方面利用偏移/反偏移过程... 不同于传统的信号域随机噪声压制方法,Kirchhoff叠前时间偏移/反偏移是一种基于地震数据映射的随机噪声压制方法。该方法一方面利用数据映射算子的共轭特性,保证了有效信号在偏移/反偏移处理后的良好恢复;另一方面利用偏移/反偏移过程中包含的叠加运算,达到了增强有效信号、压制随机噪声的目的。简要介绍了Kirchhoff偏移/反偏移算法的基本理论及其去噪原理,讨论分析了算法实现过程中偏移孔径、加权函数、反假频滤波因子等重要参数的选取。最后,通过模型数据的测试和实际资料的处理验证了Kirchhoff叠前时间偏移/反偏移叠前去噪方法的随机噪声压制效果。 展开更多
关键词 随机噪声压制 Kirchhoff偏移 反偏移 偏移孔径 加权函数 反假频准则
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