We investigate the evolution of a scalar field propagating in Reissner-Nordström Anti-de Sitter spacetime. Due to the characteristic of spacetime geometry, the radiative tails associated with a massless scalar field propagation have an oscillatory exponential decay. The object-picture of the quasinormal ringing has also been obtained. For small charges, the approach to thermal equilibrium is fa...

Highly correlated ab initio quartic force fields (QFFs) are used to calculate the equilibrium structures and predict the spectroscopic parameters of three HC(2)N isomers. Specifically, the ground state quasilinear triplet and the lowest cyclic and bent singlet isomers are included in the present study. Extensive treatment of correlation effects were included using the singles and doubles couple...

In this paper, a study on the vibration of thin cylindrical shells made of a functionally gradient material (FGM) composed of stainless steel and nickel is presented. The effects of the FGM configuration are taken into account by studying the frequencies of two FG cylindrical shells. Type I FG cylindrical shell has nickel on its inner surface and stainless steel on its outer surface and Type II...

In this paper, hydroforming process of bent tubes in T-shaped die is studied for pulsating and linear pressure paths by the finite element method. Forming Limit Diagrams (FLDs) and thickness distribution curves are used to investigate the effect of pulsating pressure on hydroforming process. In addition, the obtained numerical results are compared with experimental results of hydroforming of st...

We propose a class of models exhibiting instanton crystal phase. In this phase, the minimum free energy corresponds to configuration with an imaginary-time-dependent order parameter in form chain alternating instantons and antiinstantons. The resulting characteristic feature state is that average over imaginary time vanishes. study model broad region parameters quantitatively, prove existence w...

an efficient one-pot three-component procedure for the synthesis of new chiral spiro oxindolopyrrolidines/pyrrolizidines with highly regio- and diastereo-enantio, selective from 1,3-dipolar cycloaddition of azomethine ylides and chiral menthol-drived trans-cinnamic are described. the mechanism of the reaction is discussed on basis of the assignment of the absolute configuration of one of the cy...

Transposase, TnpA, of the IS200/IS605 family member IS608, catalyses single-strand DNA transposition and is dimeric with hybrid catalytic sites composed of an HUH motif from one monomer and a catalytic Y127 present in an α-helix (αD) from the other (trans configuration). αD is attached to the main body by a flexible loop. Although the reactions leading to excision of a transposition intermediat...

This work reports the syntheses, structures and some photochemistry in DMF of the cobalt complexes trans-[Co(2)Cl2]Cl 0.5CH3OH and trans-[Co (3)Cl2]Cl 4H2O, where 2 is 6-(anthracen-9-ylmethyl)-1,4,8,11tetraazacyclotetradecane-5,7-dione and 3 is 6-(anthracen-9-ylmethyl)-1,4,8,11-tetraazacyclotetradecane. In the preparation of the macrocyclic ligand, 3, the formation of a polycyclic bis(aminal) i...