we introduce the notion ofstrongly $alpha$-reversible rings which is a strong version of$alpha$-reversible rings, and investigate its properties. we firstgive an example to show that strongly reversible rings need not bestrongly $alpha$-reversible. we next argue about the strong$alpha$-reversibility of some kinds of extensions. a number ofproperties of this version are established. it is shown ...

in this paper, we introduce a class of rings which is a generalization of reversible rings. let r be a ring with identity. a ring r is called central reversible if for any a,b ∈ r, ab=0 implies ba belongs to the center of r. since every reversible ring is central reversible, we study sufficient conditions for central reversible rings to be reversible. we prove that some results of reversible ri...

We prove the existence of quasi-periodic, small amplitude, solutions for quasi-linear and fully nonlinear forced perturbations of KdV equations. For Hamiltonian or reversible nonlinearities we also obtain the linear stability of the solutions. The proofs are based on a combination of different ideas and techniques: (i) a Nash-Moser iterative scheme in Sobolev scales. (ii) A regularization proce...

The electron accepting 1-methyl-4,5-dicyanoimidazole group was attached to vinyl polymers, via an alkoxy link, by nucleophilic aromatic substitution (NAS) of 1-methyl-2-fluoro-4,5-dicyanoimidazole (1) with poly(vinyl alcohol), or conventional polymerizations of vinyl monomers containing 1-methyl-2-oxo-4,5-dicyanoimidazole. The cyclic voltammetry (CV) studies show that monomeric and oligomeric m...

The cathodic reduction of SiO2 in KCl-CaCl2-NaCl-MgCl2 melt was studied using tungsten wires as working electrodes. The results of cyclic voltammetry square wave voltammetry and chronopotentiometry showed that the cathodic deposition of silicon is a quasi-reversible diffusion-controlled reaction, followed by a four electrons transfer step. The results of current reversal chronopotentiometry and...

Consider a finite absorbing Markov generator, irreducible on the non-absorbing states. PerronFrobenius theory ensures the existence of a corresponding positive eigenvector φ. The goal of the paper is to give bounds on the amplitude maxφ{minφ. Two approaches are proposed: one using a path method and the other one, restricted to the reversible situation, based on spectral estimates. The latter ap...

Electrochemical and spectroscopic investigations were performed in order to clarify the mechanism of 4nitrobenzene diazonium reduction on glassy carbon in protic medium. The number and nature of the electron transfer processes were found to be strongly correlated to the electrode surface state. On polished electrode two different reduction peaks were observed. Selective electrolyses realized at...

The electrochemical behavior of dysprosium ions, as well and nickel ion co-reduction, on inert tungsten electrodes active were studied in the eutectic KCl-NaCl-CsCl melt at a temperature 823 K using methods cyclic square-wave voltammetry open circuit chronopotentiometry. process Dy3+ ions electroreduction was found to be reversible proceed within single three-electron stage up polarization rate...