Editorial

Dear colleagues and friends,

Together with you we had another exciting year 2009 with four issues of our journal being published.

The impact factor for year 2008, evaluated for our journal by Thomson ISI Journal Citation Reports in 2009, is 0.488 and we sincerely hope to bring it higher thanks to the invaluable cooperation with you, our contributors, readers and referees.

In order to provide more efficient, "as soon as accepted" online publishing scheme, we decided to change our usual page numbering template. Starting with volume 13 (2010) onwards, the papers and other publications will be numbered via a five-digit identification number instead of the ordinary page numbers.

S. Mongkolsakulvong, T.D. Frank

Canonical-dissipative limit cycle oscillators with a short-range interaction in phase space

D. Henderson

Convenient formulae for some integrals in perturbation theory

I.V. Stasyuk, T.S. Mysakovych, V.O. Krasnov

Phase diagrams of the Bose-Fermi-Hubbard model: Hubbard operator approach

M.A. Shpot

Two-loop RG functions of the massive φ⁴ field theory in general dimensions

A.l. Fariñas-Sánchez, R. Botet, B. Berche, R. Paredes

On the critical behaviour of two-dimensional liquid crystals

O. Pizio, S. Sokołowski

Entropic solvation force between surfaces modified by grafted chains: a density functional approach

V.I. Boichuk, I.V. Bilynskyi, I.O. Shakleina, V.B. Holskyi

Properties of a charge in the nanoheterosystems with quantum wells and barriers

V.I. Boichuk, I.V. Bilynskyi, R.Ya. Leshko

Hole, impurity and exciton states in a spherical quantum dot

C.V. Madhusudhana Rao, G. Prasad

Characterization of 1-3 piezoelectric polymer composites - a numerical and analytical evaluation procedure for thickness mode vibrations

J. Rössler, D. Mainemer

Ferrimagnetism in the Hubbard, dimmer-connector frustrated chain

R.R. Levitskii, A.Ya. Andrusyk, I.R. Zachek

Dynamics of the Rochelle salt NaKC₄H₄O₆·4H₂O crystal studied within the Mitsui model extended by piezoelectric interaction and transverse field

S.I. Sorokov, R.R. Levitskii, A.S. Vdovych

Thermodynamics, dielectric permittivity and phase diagrams of the Rb_1-x(NH₄)_xH₂PO₄ type proton glasses

L. Zhang

Polar interface optical phonon states and their dispersive properties of a wurtzite GaN quantum dot: quantum size effect