1,721,050 research outputs found
Hilbert-Chow morphism for non commutative Hilbert schemes and moduli spaces of linear representations
No full textBrauer groups of 1-motives
Full text linkOver a normal base scheme, we prove the generalized Theorem of the Cube for 1-motives and that a torsion class of the group He ́t2(M,Gm,M) of a 1-motive M, whose pull-back via the unit section ε:S→M is zero, comes from an Azumaya algebra. In particular, we deduce that over an algebraically closed field of characteristic zero, all classes of He ́t2(M,Gm,M) come from Azumaya algebras
Localized defect centers and continuous distribution of gap states in polycrystalline diamond
No full text
A note on divisorial Correspondences of extensions of abelian schemes by tori
Full text linkLet S be a locally noetherian scheme and consider two extensions G1 and G2 of abelian S-schemes by S-tori. In this note we prove that the fppf-sheaf (Formula presented.) of divisorial correspondences between G1 and G2 is representable. Moreover, using divisorial correspondences, we show that line bundles on an extension G of an abelian scheme by a torus define group homomorphisms between G and (Formula presented.) Dedicated to M. Raynaud
A Proposal to Implement Optoelectronic CNN Systems by Amorphous Silicon Thin-Film Technology
No full textVoltage tunable SiGe photodetector: A novel tool for crypted optical communications through wavelength mixing
No full textA novel tandem SiGe-Si device is demonstrated which, based on different photoresponses in two back-to-back diodes, exhibits a voltage tunable spectral responsivity. This feature, in conjunction with a wavelength dependence in the current direction, allows the efficient decryption of a signal when substantial noise is added to distinct carrier frequencies. Time dependent encryption schemes are also possible via a modulated voltage bias. (C) 1997 American Institute of Physics
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