搜索结果: 16-30 共查到“理学 flat”相关记录78条 . 查询时间(0.094 秒)
Dual-Frequency Observations of 140 Compact, Flat-Spectrum Active Galactic Nuclei for Scintillation-Induced Variability
Flat-Spectrum Active Galactic Nuclei Variability
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2011/10/8
The 4.9 GHz Micro-Arcsecond Scintillation-Induced Variability (MASIV) Survey detected a drop in Interstellar Scintillation (ISS) for sources at redshifts z > 2, indicating an apparent increase in angu...
Mass-capacity inequalities for conformally flat manifolds with boundary
Mass-capacity inequalities conformally flat manifolds boundary
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2011/8/29
Abstract: In this paper we prove a mass-capacity inequality and a volumetric Penrose inequality for conformally flat manifolds, in arbitrary dimensions. As a by-product of the proofs, capacity and Ale...
Rings over which every module has a flat $δ$-cover
-covers -perfect rings -semiperfect rings Flat modules
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2011/8/25
Abstract: Let $M$ be a module. A {\em $\delta$-cover} of $M$ is an epimorphism from a module $F$ onto $M$ with a $\delta$-small kernel. A $\delta$-cover is said to be a {\em flat $\delta$-cover} in ca...
Hadamard States for the Vector Potential on Asymptotically Flat Spacetimes
Hadamard States Asymptotically Flat Spacetimes General Relativity and Quantum Cosmology
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2011/7/28
Abstract: We develop a quantization scheme for the vector potential on globally hyperbolic spacetimes which realizes it as a locally covariant conformal quantum field theory. This result allows us to ...
Evaluation of catchment contributing areas and storm runoff in flat terrain subject to urbanisation
catchment contributing areas storm runoff flat terrain subject
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2011/3/14
Contributing Catchment Area Analysis (CCAA) is a spatial analysis technique developed and used for estimation of the hydrological connectivity of relatively flat catchments. It allows accounting for t...
Hypersurfaces in non-flat Lorentzian space forms satisfying $L_k\psi=A\psi+b$
linearized operator Lk isoparametric hypersurface k-maximal hypersurface
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2011/1/21
We study hypersurfaces either in the De Sitter space Sn+1 1 ⊂ Rn+2 1 or in the anti De
Sitter space Hn+1 1 ⊂ Rn+2 2 whose position vector satisfies the condition Lk = A + b,
When every principal ideal is flat
PF-ring direct product localization Dedekind domain
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2011/1/20
This paper deals with well-known notion of PF-rings, that is, rings in which principal ideals are flat. We give a new characterization of PF-rings. Also, we provide a necessary and sufficient conditio...
Non-existence of CR submanifolds of maximal CR dimension satisfying RA = 0 in non-flat complex space forms
Complex space form CR submanifold of maximal CR dimension
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2011/2/25
It has been proved that there are no real hypersurfaces satisfying RA =0 in non-flat complex space forms. In this paper we prove that the same is true in the case of CR submanifolds of maximal CR dime...
Uniqueness of the Foliation of Constant Mean Curvature Spheres in Asymptotically Flat 3-Manifolds
Uniqueness Foliation of Constant Mean Curvature Spheres Asymptotically Flat 3-Manifolds
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2011/2/21
In this paper I study the constant mean curvature surface in asymp-totically flat 3-manifolds with general asymptotics. Under some weak condition, I prove that outside some compact set in the asymptot...
Acyclicity of complexes of flat modules
Acyclicity of complexes flat modules
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2011/1/19
Let R be a noetherian commutative ring, and F : · · · → F2 → F1 → F0 → 0 a complex of flat R-modules. We prove that if (p) ⊗R F is acyclic for every p ∈ SpecR, then F is acyclic, and H0(F) is R...
Half-flat structures on decomposable Lie groups
Half-flat structures decomposable Lie groups
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2011/2/22
Half-flat SU(3)-structures are the natural initial values for Hitchin’s evolution equations whose solutions define parallel G2-structures.
Multiscale flat norm signatures for shapes and images
Multiscale flat norm signatures shapes and images
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2010/9/21
In this paper we begin to explore the application of the multiscale flat norm introduced in Morgan and Vixie [13] to shape and image analysis. In particular, we look at the use of the multiscale flat ...
Singular set of a Levi-flat hypersurface is Levi-flat
Singular set Levi-flat hypersurface Levi-flat
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2011/3/1
We study the singular set of a singular Levi-flat real-analytic hypersurface.We prove that the singular set of such a hypersurface is Levi-flat in the appropriate sense.We also show that if the singul...
Moduli spaces of flat Lie algebroid connections
moduli space connection Lie algebroid.
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2011/2/21
We shall prove that a moduli space of flat irreducible Lie algebroid connections over a compact
manifold has locally a natural structure of a smooth differentiable space. This is a generaliza-tion of...
Estimating the Hubbard repulsion sufficient for the onset of nearly-flat-band ferromagnetism
Hubbard repulsion sufficient onset of nearly-flat-band ferromagnetism
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2011/3/2
We consider nearly-flat-band Hubbard models of a ferromagnet, that is the models that are weak perturbations of those flat-band Hubbard models whose ground state is ferromagnetic for any nonzero stren...