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Conformal Deformations for Prescribing Scalar Curvature on Riemannian Manifolds with Negative Curvature
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作者 Hu Zejun Postdoctoral Station of Mathematics, Hangzhou University, Hangzhou, 310028, China Department of Mathematics, Zhengzhou University, Zhengzhou 450052, China 《Acta Mathematica Sinica,English Series》 SCIE EI CSCD 1998年第3期361-370,共10页
We study the conformal deformation for prescribing scalar curvature function on Cartan-Hadamard manifold M^n(n≥3) with strongly negative curvature. By employing the super- subsolution method and a careful constructi... We study the conformal deformation for prescribing scalar curvature function on Cartan-Hadamard manifold M^n(n≥3) with strongly negative curvature. By employing the super- subsolution method and a careful construction for the supersolution, we obtain the best possible asymptotic behavior for near infinity so that the problem of complete conformal deformation is solvable. In more general cases, we prove an asymptotic estimation on the solutions of the conformal scalar curvature equation. 展开更多
关键词 conformal deformation Scalar curvature Complete metric Super-subsolution method
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CONFORMAL DEFORMATION OF COMPLETE SURFACE WITH NEGATIVE CURVATURE
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作者 ZHOU DETANG 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 1997年第2期173-180,共8页
The author considers the problem of deforming the metric on a complete negatively curved surface conformal to another metric whose Gauss curvature is nonpositive.
关键词 Riemannian manifold conformal deformation Gaussian curvature
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Conformal deformation of a close Riemannian submanifold to minimal submanifold
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《Chinese Science Bulletin》 SCIE CAS 1998年第6期527-527,共1页
关键词 conformal deformation of a close Riemannian submanifold to minimal submanifold
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一种融合卷积与transformer的级联包检测方法
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作者 罗晓霞 蒋磊 蔡院强 《电子测量技术》 北大核心 2022年第23期91-98,共8页
为解决目前包检测算法检测类别单一、准确度较低、复杂目标难以检测等问题,研究了一种融合卷积与transformer的级联包检测方法,CT-CBDet。首先,设计了deformable conformer作为骨干网络进行特征提取,其在transformer与卷积双网络融合的... 为解决目前包检测算法检测类别单一、准确度较低、复杂目标难以检测等问题,研究了一种融合卷积与transformer的级联包检测方法,CT-CBDet。首先,设计了deformable conformer作为骨干网络进行特征提取,其在transformer与卷积双网络融合的基础上利用可形变卷积和空间金字塔池化模块实现几何特征变换与多尺度特征融合,以强化针对复杂特征的建模能力;然后,提出一种基于anchor统计特征的自适应正负样本选择的区域建议网络,以平衡不同尺度目标样本正负选择的公平性,增强模型的训练稳定性;最后,利用多阶段损失对模型的级联检测组件进行端到端训练。结果表明,该方法相较于基准方法Cascade RCNN平均精度值提高了5.8%,小尺度目标检测精度提高了10.9%。可见CT-CBDet可有效完成复杂场景下的包检测任务。 展开更多
关键词 包检测 级联架构 特征融合 自适应区域建议网络 deformable conformer
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Deformations and generalized derivations of Hom-Lie conformal algebras 被引量:2
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作者 Jun Zhao Lamei Yuan Liangyun Chen 《Science China Mathematics》 SCIE CSCD 2018年第5期797-812,共16页
The purpose of this paper is to extend the cohomology and conformal derivation theories of the classical Lie conformal algebras to Hom-Lie conformal algebras. In this paper, we develop cohomology theory of Hom-Lie con... The purpose of this paper is to extend the cohomology and conformal derivation theories of the classical Lie conformal algebras to Hom-Lie conformal algebras. In this paper, we develop cohomology theory of Hom-Lie conformal algebras and discuss some applications to the study of deformations of regular Hom-Lie conformal algebras. Also, we introduce α~k-derivations of multiplicative Hom-Lie conformal algebras and study their properties. 展开更多
关键词 Hom-Lie conformal algebras α~k-derivations cohomology deformations generalized derivations
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