13 research outputs found
-dimensional positively curved manifolds with -symmetry
We show that ten-dimensional closed simply connected positively curved
manifolds with isometric effective actions of three-dimensional tori are
homotopy spheres or homotopy complex projective spaces.Comment: 16 page
Exotic torus manifolds and equivariant smooth structures on quasitoric manifolds
In 2006 Masuda and Suh asked if two compact non-singular toric varieties
having isomorphic cohomology rings are homeomorphic. In the first part of this
paper we discuss this question for topological generalizations of toric
varieties, so-called torus manifolds. For example we show that there are
homotopy equivalent torus manifolds which are not homeomorphic. Moreover, we
characterize those groups which appear as the fundamental groups of locally
standard torus manifolds.
In the second part we give a classification of quasitoric manifolds and
certain six-dimensional torus manifolds up to equivariant diffeomorphism.
In the third part we enumerate the number of conjugacy classes of tori in the
diffeomorphism group of torus manifolds. For torus manifolds of dimension
greater than six there are always infinitely many conjugacy classes. We give
examples which show that this does not hold for six-dimensional torus
manifolds.Comment: 21 pages, 2 figures, results about quasitoric manifolds adde
Complete Intersections with S^1-action
We give the diffeomorphism classification of complete intersections with
S^1-symmetry in dimension less than or equal to 6. In particular, we show that
a 6-dimensional complete intersection admits a smooth non-trivial S^1-action if
and only if it is diffeomorphic to the complex projective space or the quadric.
We also prove that in any odd complex dimension only finitely many complete
intersections can carry a smooth effective action by a torus of rank .Comment: updated, revised and extended version including a finiteness result
for complete intersections with torus actions of rank 2, v5: minor
modifications, v6: reference updated, final version, to appear in
Transformation Group
Remarks on the classification of quasitoric manifolds up to equivariant homeomorphism
We give three sufficient criteria for two quasitoric manifolds (M,M') to be
(weakly) equivariantly homeomorphic.
We apply these criteria to count the weakly equivariant homeomorphism types
of quasitoric manifolds with a given cohomology ring.Comment: 11 page
Controlling the Oxidation of Magnetic and Electrically Conductive Solid-Solution Iron-Rhodium Nanoparticles Synthesized by Laser Ablation in Liquids
This study focuses on the synthesis of FeRh nanoparticles via pulsed laser ablation in liquid and on controlling the oxidation of the synthesized nanoparticles. Formation of monomodal γ-FeRh nanoparticles was confirmed by transmission electron microscopy (TEM) and their composition confirmed by atom probe tomography (APT). For these particles, three major contributors to oxidation were analysed: (1) dissolved oxygen in the organic solvents, (2) the bound oxygen in the solvent and (3) oxygen in the atmosphere above the solvent. The decrease of oxidation for optimized ablation conditions was confirmed through energy-dispersive X-ray (EDX) and Mössbauer spectroscopy. Furthermore, the time dependence of oxidation was monitored for dried FeRh nanoparticles powders using ferromagnetic resonance spectroscopy (FMR). By magnetophoretic separation, B2-FeRh nanoparticles could be extracted from the solution and characteristic differences of nanostrand formation between γ-FeRh and B2-FeRh nanoparticles were observed
Analysis of Surface Roughness with 3D SAR Imaging at 1.5 THz
The expansion of the synthetic aperture radar (SAR) to the emerging THz spectrum has enabled a new era of applications in the areas of automobile, security, non-destructive testing, and material characterization. Thanks to the sub-mm wavelength, extraction of material surface properties is possible and of significant interest for the THz SAR applications. The properties define the surface scattering behavior, which is relational to the applied frequency. This study focuses on surface classification. We evaluate the scattering behavior of a rough surface and a smooth surface at 1.5 THz based on a SAR processing sequence that is introduced in this paper. First, we form the 3D SAR images of the metallic objects and then evaluate the surface properties based on the variation in the energy reflected by the object's surface
Approach for long-range frequency domain chipless RFID tags towards THz
This paper presents an approach of an RFID system, which operates at frequencies of 100 GHz and above. Key issue of the system is an extremely small, chipless, tag, that is based on the “dielectric resonant antenna” (DRA) technology and provides identification as well as sensor capability. The tag uses radio-frequency backscattering techniques to encode and transmit the ID-data or measured values, respectively. The resonance frequency of a single DRA on the tag is determined as a peak in its radar cross section. To encode an ID number, the tag is built from several DRAs with slightly different resonant frequencies. A temperature dependency can be obtained by a temperature dependent permittivity of the DRA. The focus of the presented work is the estimation of the reading distance. Constraints are derived from previous work and typical indoor scenarios. The link budget calculation shows expected ranges of up to 20 meters