This research deals with the development of a new semi-analytical model for composite-metal eccentric tensile bolted joints casing structures. The is based on direct stiffness method considering structural elements, where flanges are modeled axisymmetric shell bolt beam element and contact behavior specific number compressive linear springs, identified by means convergence tests. A hybrid added...

Radio relics are Mpc-sized synchrotron sources located in the peripheral regions of galaxy clusters. Models based on diffuse shock acceleration (DSA) scenario have been widely accepted to explain formation radio relics. However, a critical challenge these models is that most observed shocks seem too weak generate detectable emission, unless fossil electrons, population mildly energetic electron...

The cosmic microwave background (CMB) temperature autocorrelations, induced by a magnetized adiabatic mode of curvature inhomogeneities, are computed with semianalytical methods. As suggested by the latest CMB data, a nearly scale-invariant spectrum for the adiabatic mode is consistently assumed. In this situation, the effects of a fully inhomogeneous magnetic field are scrutinized and constrai...

The Bethe–Salpeter equation for bound states of a fermion–antifermion pair in the instantaneous approximation for the involved interaction kernel is converted into an equivalent matrix eigenvalue problem with explicitly (algebraically) given matrices. PACS numbers : 11.10.St, 03.65.Ge ∗ E-mail address : [email protected] ‡ E-mail address : [email protected] † E-mail address : franz.schoebe...

The eigenvalue equation of a semirelativistic Hamiltonian composed of the relativistic kinetic term of spin-0 particles and static interactions is called spinless Salpeter equation. It is regarded as relativistic generalization of the nonrelativistic Schrödinger approach, or as approximation to the homogeneous Bethe–Salpeter equation in its instantaneous limit. The nonlocality inherent to this ...

This paper presents a new semi-analytical solution and the related methodology to analyze pressure behavior of multi-branch wells produced from natural gas hydrates. For constant bottom-hole production, transient flow is obtained by Laplace transforms. The interference among various branches investigated using superposition principle. A simplified form proposed model validated published analyti...