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EXISTENCE OF MULTIPLE SOLUTIONS FOR SINGULAR QUASILINEAR ELLIPTIC SYSTEM WITH CRITICAL SOBOLEV-HARDY EXPONENTS AND CONCAVE-CONVEX TERMS 被引量:6
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作者 李圆晓 高文杰 《Acta Mathematica Scientia》 SCIE CSCD 2013年第1期107-121,共15页
The main purpose of this paper is to establish the existence of multiple solutions for singular elliptic system involving the critical Sobolev-Hardy exponents and concave-convex nonlinearities. It is shown, by means o... The main purpose of this paper is to establish the existence of multiple solutions for singular elliptic system involving the critical Sobolev-Hardy exponents and concave-convex nonlinearities. It is shown, by means of variational methods, that under certain conditions, the system has at least two positive solutions. 展开更多
关键词 singular elliptic system concave-convex nonlinearities positive solution Nehari manifold critical Sobolev-Hardy exponent
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ON SEMILINEAR ELLIPTIC EQUATIONS WITH CONCAVE AND CONVEX NONLINEARITIES IN R^N
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作者 杨海涛 陈祖墀 《Acta Mathematica Scientia》 SCIE CSCD 2000年第2期181-188,共8页
In this paper, a class of semilinear elliptic equations with sublinear and superlinear nonlinearities in R-N is studied. By making use of variational method and L-infinity estimation, the authors obtain some results a... In this paper, a class of semilinear elliptic equations with sublinear and superlinear nonlinearities in R-N is studied. By making use of variational method and L-infinity estimation, the authors obtain some results about existence of multiple positive solutions and asymptotic behavior of the solutions. 展开更多
关键词 concave convex critical point asymptotic behavior
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Zeno’s Paradoxes and Lie Tzu’s Dichotomic Wisdom Explained with Alpha Beta (αβ) Asymptotic Nonlinear Math (Including One Example on Second Order Nonlinear Phenomena)
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作者 Ralph W. Lai Melisa W. Lai-Becker Evgenios Agathokleous 《Journal of Applied Mathematics and Physics》 2023年第5期1209-1249,共41页
Zeno’s paradoxes are a set of philosophical problems that were first introduced by the ancient Greek philosopher Zeno of Elea. Here is the first attempt to use asymptotic approach and nonlinear concepts to address th... Zeno’s paradoxes are a set of philosophical problems that were first introduced by the ancient Greek philosopher Zeno of Elea. Here is the first attempt to use asymptotic approach and nonlinear concepts to address the paradoxes. Among the paradoxes, two of the most famous ones are Zeno’s Room Walk and Zeno’s Achilles. Lie Tsu’s pole halving dichotomy is also discussed in relation to these paradoxes. These paradoxes are first-order nonlinear phenomena, and we expressed them with the concepts of linear and nonlinear variables. In the new nonlinear concepts, variables are classified as either linear or nonlinear. Changes in linear variables are simple changes, while changes in nonlinear variables are nonlinear changes relative to their asymptotes. Continuous asymptotic curves are used to describe and derive the equations for expressing the relationship between two variables. For example, in Zeno’s Room Walk, the equations and curves for a person to walk from the initial wall towards the other wall are different from the equations and curves for a person to walk from the other wall towards the initial wall. One walk has a convex asymptotic curve with a nonlinear equation having two asymptotes, while the other walk has a concave asymptotic curve with a nonlinear equation having a finite starting number and a bottom asymptote. Interestingly, they have the same straight-line expression in a proportionality graph. The Appendix of this discussion includes an example of a second-order nonlinear phenomenon. . 展开更多
关键词 DICHOTOMY Asymptotic concave and convex Curve Upper and Bottom As-ymptote Cumulative and Demulative Numbers (Opposite to Cumulative Numbers) Coefficient of Determination Skewed Bell Sigmoid Curve
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MULTIPLE POSITIVE SOLUTIONS FOR QUASILINEAR ELLIPTIC PROBLEMS INVOLVING CONCAVE-CONVEX NONLINEARITIES AND MULTIPLE HARDY-TYPE TERMS 被引量:3
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作者 Tsing-San HSU 《Acta Mathematica Scientia》 SCIE CSCD 2013年第5期1314-1328,共15页
In this paper, we deal with the existence and multiplicity of positive solutions for the quasilinear elliptic problem -△pu-∑i=1^kμi|u|^p-2/|x-ai|p^u=|u|^p^*-2u+λ|u|^q-2u,x∈Ω,where Ω belong to R^N(N ... In this paper, we deal with the existence and multiplicity of positive solutions for the quasilinear elliptic problem -△pu-∑i=1^kμi|u|^p-2/|x-ai|p^u=|u|^p^*-2u+λ|u|^q-2u,x∈Ω,where Ω belong to R^N(N ≥ 3) is a smooth bounded domain such that the different points ai∈Ω,i= 1,2,...,k,0≤μi〈μ^-=(N-p/p)^p,λ〉0,1≤q〈p,and p^*=p^N/N-p.The results depend crucially cn the parameters λ,q and μi for i=1,2,...,k. 展开更多
关键词 multiple positive solutions concave-convex nonlinearities multiple Hardy- type terms
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Application of ACP Nonlinear Math in Analyzing Arithmetic and Radiation Transmission Data (Application 1 & 2) [4-21-2024, 820P] (V)
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作者 Ralph W. Lai Melisa W. Lai-Becker Grace Cheng-Dodge 《Journal of Applied Mathematics and Physics》 2024年第6期2302-2319,共18页
In this study, we explore the application of ACP (asymptotic curve based and proportionality oriented) Alpha Beta (αβ) Nonlinear Math to analyze arithmetic and radiation transmission data. Specifically, we investiga... In this study, we explore the application of ACP (asymptotic curve based and proportionality oriented) Alpha Beta (αβ) Nonlinear Math to analyze arithmetic and radiation transmission data. Specifically, we investigate the relationship between two variables. The novel approach involves collecting elementary “y” data and subsequently analyzing the asymptotic cumulative or demulative (opposite of cumulative) Y data. In part I, we examine the connection between the common linear numbers and ideal nonlinear numbers. In part II, we delve into the relationship between X-ray energy and the radiation transmission for various thin film materials. The fundamental physical law asserts that the nonlinear change in continuous variable Y is negatively proportional to the nonlinear change in continuous variable X, expressed mathematically as dα = −Kdβ. Here: dα {Y, Yu, Yb} represents the change in Y, with Yu and Yb denoting the upper and baseline asymptote of Y. dβ {X, Xu, Xb} represents the change in X, with Xu and Xb denoting the upper and baseline asymptote of X. K represents the proportionality constant or rate constant, which varies based on equation arrangement. K is the key inferential factor for describing physical phenomena. 展开更多
关键词 Asymptotic concave and convex Curve Upper and Baseline Asymptote Demulative vs. Cumulative Coefficient of Determination Proportionalityand Position Constant Skewed Bell and Sigmoid Curve
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Existence of Positive Solutions to Semilinear Elliptic Systems Involving Concave and Convex Nonlinearities
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作者 Mohamed E1 Mokhtar ould El Mokhtar 《Journal of Physical Science and Application》 2015年第1期71-81,共11页
关键词 半线性椭圆系统 正解的存在性 非线性 综合效应 心功能 解数
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Multiple Solutions for a Class of Variable-Order Fractional Laplacian Equations with Concave-Convex Nonlinearity
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作者 Canlin Gan Ting Xiao Qiongfen Zhang 《Journal of Applied Mathematics and Physics》 2022年第3期837-849,共13页
This paper is concerned with the following variable-order fractional Laplacian equations , where N ≥ 1 and N > 2s(x,y) for (x,y) ∈ Ω × Ω, Ω is a bounded domain in R<sup>N</sup>, s(&#8901;)... This paper is concerned with the following variable-order fractional Laplacian equations , where N ≥ 1 and N > 2s(x,y) for (x,y) ∈ Ω × Ω, Ω is a bounded domain in R<sup>N</sup>, s(&#8901;) ∈ C (R<sup>N</sup> × R<sup>N</sup>, (0,1)), (-Δ)<sup>s(&#8901;)</sup> is the variable-order fractional Laplacian operator, λ, μ > 0 are two parameters, V: Ω → [0, ∞) is a continuous function, f ∈ C(Ω × R) and q ∈ C(Ω). Under some suitable conditions on f, we obtain two solutions for this problem by employing the mountain pass theorem and Ekeland’s variational principle. Our result generalizes the related ones in the literature. 展开更多
关键词 concave-convex Nonlinearity Variable-Order Fractional Laplacian Variational Methods Fractional Elliptic Equation
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Stratified Convexity &Concavity of Gradient Flows on Manifolds with Boundary
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作者 Gabriel Katz 《Applied Mathematics》 2014年第17期2823-2848,共26页
As has been observed by Morse [1], any generic vector field v on a compact smooth manifold X with boundary gives rise to a stratification of the boundary by compact submanifolds , where . Our main observation is that ... As has been observed by Morse [1], any generic vector field v on a compact smooth manifold X with boundary gives rise to a stratification of the boundary by compact submanifolds , where . Our main observation is that this stratification re-flects the stratified convexity/concavity of the boundary ?with respect to the ?v-flow. We study the behavior of this stratification under deformations of the vector field v. We also investigate the restrictions that the existence of a convex/concave traversing ?v-flow imposes on the topology of X. Let be the orthogonal projection of on the tangent bundle of . We link the dynamics of theon the boundary with the property of in X being convex/concave. This linkage is an instance of more general phenomenon that we call “holography of traversing fields”—a subject of a different paper to follow. 展开更多
关键词 MORSE Theory Gradient FLOWS convexITY CONCAVITY MANIFOLDS with Boundary
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Duality in interaction potentials for curved surface bodies and inside particles
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作者 Dan WANG Yajun YIN +1 位作者 Jiye WU Zheng ZHONG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2017年第8期1071-1090,共20页
Based on the viewpoint of duality, this paper studies the interaction between a curved surface body and an inside particle. By convex/concave bodies with geometric duality, interaction potentials of particles located ... Based on the viewpoint of duality, this paper studies the interaction between a curved surface body and an inside particle. By convex/concave bodies with geometric duality, interaction potentials of particles located outside and inside the curved surface bodies are shown to have duality. With duality, the curvature-based potential between a curved surface body and an inside particle is derived. Furthermore, the normal and tangential driving forces exerted on the particle are studied and expressed as a function of curvatures and curvature gradients. Numerical experiments are designed to test accuracy of the curvature-based potential. 展开更多
关键词 curved duality curvature concave tangential viewpoint convex intersection body radius
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凹凸工艺在再生纸包装设计中的应用研究
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作者 董小丹 《文化创新比较研究》 2024年第5期120-123,129,共5页
凹凸工艺与再生纸包装结合深受人们关注,随着人们环保意识的提高,再生纸包装设计运用广泛。同时,再生纸结合凹凸工艺让包装更具有一定的审美价值及实用价值。然而,在当下市场凹凸工艺的印刷及制作成本相对较高,因此该文主要研究凹凸工... 凹凸工艺与再生纸包装结合深受人们关注,随着人们环保意识的提高,再生纸包装设计运用广泛。同时,再生纸结合凹凸工艺让包装更具有一定的审美价值及实用价值。然而,在当下市场凹凸工艺的印刷及制作成本相对较高,因此该文主要研究凹凸工艺在再生纸包装设计中与3D+AI智能技术结合,以及探讨凹凸工艺在再生纸包装设计中的应用及创新方法,让凹凸工艺与再生纸包装融合在市场上有新的突破。同时,再生纸作为环保材料,不但具有可持续性和可回收利用的优点,还可以降低成本,凹凸工艺在再生纸包装设计中的应用研究有着更重要的意义。 展开更多
关键词 凹凸工艺 再生纸包装设计 应用研究 压印 3D+AI 环保材料
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基于拐点密集区凹凸波动特性的直流配网故障检测方法 被引量:1
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作者 王晓卫 田影 +3 位作者 高杰 王雪 梁振锋 王毅钊 《电力系统保护与控制》 EI CSCD 北大核心 2024年第9期1-15,共15页
基于模块化多电平换流器(modular multilevel converter,MMC)的柔性直流配电网具有不存在换相失败等优点。但换流器存在低惯性、弱阻尼等特性,导致故障电流上升速度快且峰值高,对系统危害极大。针对直流配电网发生单极接地故障难以准确... 基于模块化多电平换流器(modular multilevel converter,MMC)的柔性直流配电网具有不存在换相失败等优点。但换流器存在低惯性、弱阻尼等特性,导致故障电流上升速度快且峰值高,对系统危害极大。针对直流配电网发生单极接地故障难以准确选择故障馈线的问题,提出了一种基于拐点密集区凹凸波动特性的直流配网故障检测方法。首先,利用变分模态分解算法对各馈线零模电流进行分解,选取特征分量。然后,计算特征分量的二阶导数,选择拐点密集区并进行归一化处理,得到各馈线的凹凸波动性。最后,判定凹凸波动性与其他馈线相异的线路为故障线路。仿真结果表明,所提方法能够快速识别故障馈线,且受过渡电阻、采样频率、数据窗和噪声等因素影响小。 展开更多
关键词 故障检测 单极接地故障 零模电流 拐点密集区 凹凸波动性
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考虑安装误差的弧齿锥齿轮凹凸齿面印痕修正
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作者 田宇 魏理林 +2 位作者 刘斌 赵晓锋 剡昌锋 《组合机床与自动化加工技术》 北大核心 2024年第5期44-50,共7页
弧齿锥齿轮作为重型燃气轮机中关键的动力传动部件,其双向传动的运行特点对齿轮凹凸齿面的接触印痕提出了更高的质量要求。为了满足实际需求,通过建立齿面啮合模型,利用考虑安装误差的齿轮接触分析(error tooth contact analysis, ETCA... 弧齿锥齿轮作为重型燃气轮机中关键的动力传动部件,其双向传动的运行特点对齿轮凹凸齿面的接触印痕提出了更高的质量要求。为了满足实际需求,通过建立齿面啮合模型,利用考虑安装误差的齿轮接触分析(error tooth contact analysis, ETCA)技术研究了一对弧齿锥齿轮凹面和凸面均为工作面时,接触印痕随安装误差变化的数值规律。同时,以齿面印痕的中点位置、长轴倾角和面积作为印痕参数化处理后的特征值,优化齿轮安装误差调整值,修正印痕的不合理之处,实现凹凸齿面印痕的一致性和重叠性。滚检实验验证了模拟印痕的准确性,该修正规律可以为弧齿锥齿轮副的安装调整提供理论依据。 展开更多
关键词 弧齿锥齿轮 安装误差 凹凸齿面印痕 齿轮接触分析
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灭火防护服3层组合试样的热防护性能
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作者 李永海 韩月芬 +1 位作者 李慧峰 文美莲 《毛纺科技》 CAS 北大核心 2024年第6期29-33,共5页
消防员灭火防护服多为外层、防水透气层、舒适层3层织物制作,3层组合试样的质量和防护服质量直接相关。为了增强3层组合试样的热防护性能,实现灭火防护服轻量化,提高灭火救援的效率,试织了芳纶双层织物和玄武岩/阻燃粘胶包覆织物,试制... 消防员灭火防护服多为外层、防水透气层、舒适层3层织物制作,3层组合试样的质量和防护服质量直接相关。为了增强3层组合试样的热防护性能,实现灭火防护服轻量化,提高灭火救援的效率,试织了芳纶双层织物和玄武岩/阻燃粘胶包覆织物,试制了芳纶双层包覆聚四氟乙烯(PTFE)膜织物。选择2种舒适层织物和1种轻量防水透气层材料,制成不同组合试样并进行热防护性能测试。试验结果表明:3层组合试样经热防护性能测试后,玄武岩/阻燃粘胶包覆织物组织基本完整,防水透气层的PTFE膜炭化、损毁,防水性能缺失;芳纶双层织物做外层,芳纶混纺凹凸织物为舒适层的组合试样TPP值达1495.2 kW·s/m^(2),试样厚度大于3 mm。 展开更多
关键词 灭火防护服 热防护性能值 Stoll曲线 凹凸织物
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基于双凹凸变换的高阶模糊认知图天然气消费预测
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作者 王青青 骆正山 +1 位作者 高懿琼 王晓敏 《运筹与管理》 CSCD 北大核心 2024年第4期206-211,I0075-I0081,共13页
为解决高阶模糊认知图难以处理一维时间序列预测问题,提出基于双凹凸变换的高阶模糊认知图。为增加数据维度,采用特定函数对一维时间序列作凹凸变换,其次为改善高阶模糊认知图非线性表达能力,设计了具有凹凸特征的新传递函数,并结合全国... 为解决高阶模糊认知图难以处理一维时间序列预测问题,提出基于双凹凸变换的高阶模糊认知图。为增加数据维度,采用特定函数对一维时间序列作凹凸变换,其次为改善高阶模糊认知图非线性表达能力,设计了具有凹凸特征的新传递函数,并结合全国及30个省份的2000—2019年天然气消费数据进行实证分析。结果表明,在对数据作增维凹凸变换基础上,采用新设计传递函数的高阶模糊认知图和基于传统传递函数的高阶模糊认知图预测结果相比更优,新传递函数适用率高达96.4%;其次将其两者预测结果和ARIMA及GM(1,1)相比,得出所提方法的适用率可达87.1%,进一步验证了提出方法的有效性。 展开更多
关键词 双凹凸变换 高阶模糊认知图 天然气消费预测
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具有前缘凹凸结构的组合翼型优化设计及其气动特性分析
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作者 陈坤 贵红亮 +2 位作者 赵培尧 冯文慧 郝振华 《排灌机械工程学报》 CSCD 北大核心 2024年第8期771-777,共7页
为了不断探索翼型改型的方法和提高翼型的气动性能,将传统翼型与生物翼型进行轮廓修型设计得到组合翼型,通过数值模拟的方法对组合翼型进行气动特性分析.同时,对组合翼型进行前缘凹凸结构优化设计,采用正交试验优选出气动特性表现最优... 为了不断探索翼型改型的方法和提高翼型的气动性能,将传统翼型与生物翼型进行轮廓修型设计得到组合翼型,通过数值模拟的方法对组合翼型进行气动特性分析.同时,对组合翼型进行前缘凹凸结构优化设计,采用正交试验优选出气动特性表现最优的参数,并对最优前缘组合翼型进行气动特性分析.研究发现:相比标准NACA64-618翼型,组合翼型在小范围攻角有着较高的升力系数,升力系数最大提高了7.3%,此外,具有前缘凹凸结构的前缘组合翼型升阻比最大提高了9.98%.组合翼型的弯度前移使得吸力面负压峰值区域面积增大,翼型上下表面压差增大,进而提高了气动性能;前缘组合翼型由于前缘凹凸结构的存在,在翼型吸力面靠近尾缘处,形成一对反向旋涡,增加了流体在翼型表面覆盖的面积,抑制了流动分离的提前发生,进而达到失速延迟的效能. 展开更多
关键词 组合翼型 前缘凹凸 气动特性 优化设计 失速延迟
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凹凸模具对多层金属板弯曲成型损伤的影响
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作者 商锦萍 李静 易飞 《机械强度》 CAS CSCD 北大核心 2024年第3期756-762,共7页
凹凸模具在对金属板料的弯曲加工成型工艺中占有重要的地位,其中凹凸模具的圆角半径也一直是弯曲件工艺设计的关键参数。多层金属板在弯曲加工中会出现单层金属板不存在的分层损伤现象,因此主要研究凹凸模具对多层金属板在弯曲加工中损... 凹凸模具在对金属板料的弯曲加工成型工艺中占有重要的地位,其中凹凸模具的圆角半径也一直是弯曲件工艺设计的关键参数。多层金属板在弯曲加工中会出现单层金属板不存在的分层损伤现象,因此主要研究凹凸模具对多层金属板在弯曲加工中损伤的影响情况,通过改变相应模具参数来进行试验并使用有限元仿真来验证。结果表明,多层金属板在弯曲加工过程中会出现分层损伤的现象,而在不改变凸模的情况下,分层损伤的程度会随着凹模圆角半径的增大逐渐减小,多层金属板的弯曲成型效果越好。同时发现,当凹模圆角半径的数值等于凸模圆角半径与金属板材的厚度之和时,该多层金属板的弯曲成型性能最好,基本不会出现分层损伤的现象。 展开更多
关键词 凹凸模具 圆角半径 多层金属板 弯曲加工 分层损伤
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鄂尔多斯盆地延长组地层底面古构造定量化演化及其石油地质意义
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作者 高胜利 高纪杨 魏雪珂 《科学技术与工程》 北大核心 2024年第5期1782-1788,共7页
为定量化明确延长组地层在几个关键沉积期的底面凹凸构造面貌特征,基于鄂尔多斯盆地大量钻井等资料并采用盆地模拟技术,划分4个地层单元,即长10~长8、长7、长6~长4+5和长3~长1,定量化考察延长期湖盆在各层地层单元沉积末期的底面古构造... 为定量化明确延长组地层在几个关键沉积期的底面凹凸构造面貌特征,基于鄂尔多斯盆地大量钻井等资料并采用盆地模拟技术,划分4个地层单元,即长10~长8、长7、长6~长4+5和长3~长1,定量化考察延长期湖盆在各层地层单元沉积末期的底面古构造特征。结果表明:长8沉积期末,地层底面构造高程整体表现为“东高西低、南高北低”的特征,主湖盆范围的构造等高线在-600 m以下;长7地层沉积期末,整体表现为“南高北低”的古地貌特征,主湖盆范围主要分布在盆地北部、构造高程达-1 150 m以下;长4+5沉积期末,凹陷区分布在盆地西北区域、分布范围和构造高程差变小、约为200 m;长1沉积末期,地层底面构造面貌格局整体表现为“东高西低”的古地貌特征,地层底面凹凸构造高程差为300~400 m。各沉沉积期底面凹凸构造发育,缓坡构造面貌区域是油藏分布的有利区。 展开更多
关键词 地层底面凹凸古构造 主湖盆迁移 油藏分布 鄂尔多斯盆地
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给定悬挂点数的树和单圈图的顶点度函数研究
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作者 陈诗琴 耿显亚 《哈尔滨商业大学学报(自然科学版)》 CAS 2024年第3期350-353,共4页
设G是n阶简单图,G的悬挂点数记作p(G),顶点度函数指数H_(f)(G)定义为H_(f)(G)=∑_(v∈V(G))f(d(v)).考虑在给定悬挂点数为k的n阶树和单圈图中,在f(x)是严格凸函数的情况下,顶点度函数H_(f)(G)的最大值问题.在f(x)是严格凹函数的情况下,... 设G是n阶简单图,G的悬挂点数记作p(G),顶点度函数指数H_(f)(G)定义为H_(f)(G)=∑_(v∈V(G))f(d(v)).考虑在给定悬挂点数为k的n阶树和单圈图中,在f(x)是严格凸函数的情况下,顶点度函数H_(f)(G)的最大值问题.在f(x)是严格凹函数的情况下,同样的结果也适用于顶点度函数H_(f)(G)的最小值问题.通过对这些情况的分析,得出了顶点度函数H_(f)(G)在给定条件下的最值性质.这些结果对理解图论中的悬挂点和顶点度函数的性质具有重要意义. 展开更多
关键词 单圈图 悬挂点 严格凸函数 严格凹函数 顶点度函数
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R^(3)中一类带有凹凸非线性项的Schrödinger-Kirchhoff方程的无穷多解
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作者 赵莉 叶一蔚 《商洛学院学报》 2024年第4期18-24,共7页
研究一类带有凹凸非线性项的Schrödinger-Kirchhoff方程,其中位势函数不必满足强制性条件,凹项满足次线性增长性条件,并且凸项在无穷远处满足超三次线性增长性条件和在原点处满足超线性增长性条件。利用Bartsch的喷泉定理证明了对... 研究一类带有凹凸非线性项的Schrödinger-Kirchhoff方程,其中位势函数不必满足强制性条件,凹项满足次线性增长性条件,并且凸项在无穷远处满足超三次线性增长性条件和在原点处满足超线性增长性条件。利用Bartsch的喷泉定理证明了对任意的μ∈R,凹凸非线性项的Schrödinger-Kirchhoff方程都存在无穷多个高能量解,丰富和推广了已有的结论。 展开更多
关键词 Schrödinger-Kirchhoff方程 凹凸非线性项 喷泉定理 无穷多解
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基于NX PDW的压凸包凹模镶块设计方法探讨
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作者 匡和碧 《模具制造》 2024年第5期4-6,9,共4页
介绍了压凸包凸、凹模镶块的设计规范,比较了利用NX PDW的“成形镶块设计”命令和“翻孔镶块设计”命令设计压凸包凹模镶块的区别,设计实践证明,采用“翻孔镶块设计”命令设计压凸包凹模镶块更合理。
关键词 压凸包 凸、凹模镶块 NX PDW
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