Competition of spatial and temporal instabilities under time delay near codimension-two Turing-Hopf bifurcations

Competition of spatial and temporal instabilities under time delay near the codimension-two Turing-Hopf bifurcations is studied in a reaction-diffusion equation. The time delay changes remarkably the oscillation frequency, the intrinsic wave vector, and the intensities of both Turing and Hopf modes. The application of appropriate time delay can control the competition between the Turing and Hopf modes. Analysis shows that individual or both feedbacks can realize the control of the transformation between the Turing and Hopf patterns. Two dimensional numerical simulations validate the analytical results.Comment: 13 pages, 6 figure

Analysis of the scalar doubly heavy tetraquark states with QCD sum rules

In this article, we perform a systematic study of the mass spectrum of the scalar doubly charmed and doubly bottom tetraquark states using the QCD sum rules.Comment: 17 pages, 24 figures, add more discussion

Triaqua­(2,2′-bipyridine N,N′-dioxide-κ2 O,O′)(5-nitro­benzene-1,3-dicarboxyl­ato-κO 1)zinc(II)

In the title compound, [Zn(C8H3NO6)(C10H8N2O2)(H2O)3], the ZnII ion is coordinated in a distorted octa­hedral geometry by three water mol­ecules, one O atom from a 5-nitro­benzene-1,3-dicarboxyl­ate ligand and two O atoms from a chelating 2,2′-bipyridine N,N′-dioxide ligand. An extensive network of O—H⋯O hydrogen bonds is formed between the water mol­ecules and the carboxyl­ate groups. C—H⋯O inter­actions are also present