Impact of the cathode metal work function on the performance of vacuum-deposited organic light emitting-devices

Received: 7 September 1998 / Accepted: 27 November 1998 / Published online: 24 February 1999     

First evidence for the linear magnetic birefringence of the reflecting surface of interferential mirrors

-9 . Received: 20 July 1998 / Revised version: 27 November 1998 / Published online: 24 February 1999     

Relativistic properties of the quark-antiquark potential

The relativistic transformation properties of the heavy quark-antiquark interaction potential are considered in the framework of the relativistic quark model. A special attention is paid to the long-range (confining) contribution to the spin-independent part of interaction. The retardation effects are consistently taken into account. Received: 22 April 1998 / Revised version: 9 September 1998 / Published online: 22 October 1998     

On the derivation and analysis of the “machine equation” in finite deformations

Received: 23 June 1998/Accepted: 15 July 1998     

Diffuse-band radiation of molecular potassium generated by the energy-pooling effect

Received: 23 April 1998 / Revised version: 3 June 1998 / Published online: 24 February 1999     

Development and experimental validation of analytical thermal models for the evaluation of the depth of laser-treated zones

Received: 5 January 1998/Accepted: 27 March 1998     

Effects of a modulation of the pump-polarization in a degenerate pump/probe experiment

The effects of the pump-polarization in a degenerate pump/probe experiment are analyzed. It is shown that modulating the pump polarization from linear to circular induces a modulation in the probe absorption change that allows to separate various contributions that are mixed in the signal. An experimental demonstration is carried out in a laser dye (Coumarin 500). Received: 21 July 1998 / Revised: 28 October 1998 / Accepted: 20 November 1998     

Light transmittance of the layer with cylindrical pores

Received: 20 September 1998 / Revised version: 21 December 1998     

Couplings of pions with excited heavy mesons from light-cone QCD sum rules in the leading order of HQET

The couplings of pions with lowest three doublets , and of heavy mesons are studied with light-cone QCD sum rules in the leading order of heavy quark effective theory. The ambiguity due to presence of two distinct states are solved. Received: 20 January 1998 / Revised version: 3 April 1998 / Published online: 12 August 1998     

On the sensitivity limit of positron annihilation: detection of vacancies in as-grown silicon

14 cm^-3 in FZ-Si was obtained. Received: 2 June 1998 / Accepted: 20 November 1998 / Published online: 24 February 1999     

Polarization gradient cooling effect in the outer potential field

Received: 15 January 1998/Final version: 15 June 1998     

Si in-diffusion during the 3D islanding of Ge/Si(001) at high temperatures

Received: 7 September 1998 / Accepted: 20 November 1998 / Published online: 24 February 1999     

An analytical estimate of the period for the delayed logistic application and the Lotka-Volterra system

We first introduce a simple and new method for the quantitative analysis of some nonlinear oscillating systems. It is shown that if the dynamics of the system reduces to piecewise exponential growth and exponential damping phases, then the amplitude and period of the motion can be computed with accuracy in the nonlinear regime without invoking linear stability arguments or perturbative expansions. This method is then successfully applied to the delayed logistic application and to the Lotka-Volterra prey-predator model. For both of these systems, we provide an accurate analytical expression for the period of the oscillations in the nonlinear regime. Received: 27 April 1998 / Received in final form: 25 June 1998 / Accepted: 29 June 1998     

P-odd observables at the \Upsilon peak

We study the -Z interference in the process as a means to measure the neutral current coupling of the b-quark. The helicity amplitudes are calculated from resonant and background diagrams and the spin density matrix of the final state is discussed. The spin analyzer of the 's is illustrated with the decays and . With a sensitivity to of a few per cent could be reachable. Received: 14 April 1998 / Revised version: 25 August 1998 / Published online: 3 December 1998     

In uence of ambient conditions on the laser air spark

Received: 17 June 1998/Revised version: 17 September 1998     

Effect of the surface composition of chlorine-containing polymers upon their XPS parameters

Received: 6 January 1998/ Accepted: 7 January 1998     

Modeling the preparation of pc-Si thin films with a Cu vapor laser

Received: 4 February 1998/Accepted: 23 June 1998     

Experimental study with a Fourier set-up of the image transfer from a laser beam to a forward or backward stimulated Raman scattered beam

Received: 13 July 1998 / Revised version: 8 October 1998 / Published online: 24 February 1999     

Flow equations and the Ruderman-Kittel-Kasuya-Yosida interaction

In the past different models for the magnetic salt vanadyl pyrophosphate (VO)₂P₂O₇ were discussed. Neither a spin ladder nor an alternating chain are capable to describe recently measured magnetic excitations. In this paper we propose a 2D model that fits better to experimental observations. Received: 29 May 1998 / Received in final form: 25 September 1998 / Accepted: 30 September 1998     

Polarizabilities and hyperfine structure constants of the low-lying levels of barium

The results of ab initio calculation of energies, hyperfine structure constants and static polarizabilities for several low-lying levels of barium are reported. The effective Hamiltonian for the valence electrons has been constructed in the frame of CI+MBPT method and solutions of many electron equation were found. Using the wave functions obtained the hyperfine structure constants and static polarizabilities were calculated. Received: 22 June 1998 / Revised: 2 September 1998 / Accepted: 15 September 1998