M. Strat

Some experimental and theoretical results on the anodic patterns in plasma discharge

The dynamics of an interface plasma-plasma self-structured as a double anodic layer using the fractal space-time theory is established. So, for the fractal dimension D=2, the Schrodinger “fluid” is obtained as an irrotational movement of a Navier-Stokes fluid with an imaginary viscosity coefficient. In the deterministic case, the anodic double layer is described by a set of diffusion-reaction equations, a situation in which the equal diffusion curves are of the Koch-type and the self-structuring is given by means of the coherence of the electron-ion pairs. In the nondeterministic case, the anodic double layer is described by a set of time-dependent Schrodinger-type equations and the self-structuring is given by means of the negative differential resistance and the pulsation-potential linear dependence. Through the spontaneous symmetry breaking the Langmuir’s relations, the distributions of the potential field and charge densities have been obtained. The model was verified by means of our experimental data...

Ordered plasma structures in the interspace of two independently working discharges

The plasma formations that appear in the contact region between two negative glow discharges have been studied by means of electrical and spectral methods. The experimental and theoretical research of the plasma formations show that the double layer is the final stage of a more complex plasma structure which is formed first.

Basic processes in discharge plasma double layers

Experimental results regarding the study of plasma double layers (DLs) by electric and spectral methods in the case of a glow discharge obtained in a chamber of three-electrode geometry are presented. The experimental results prove that the appearance of DLs in active plasmas can be accompanied by quantum processes, such as excitation and ionization.

Optic and spectral characteristics of some aromatic copolyethers embedded in polymer matrices

Abstract Photochromic properties of copolyethers based on bisphenol-A 4, 4′-dihy-droxydiphenyl, 4, 4′-dihydroxy-azobenzene, and 3,3-bis(chloromethyl)oxetane (BCMO) both embedded in a polymer matrix (polyvinyl alcohol, PVA) and in the pure state, deposed on quartz disks, have been studied. The polarization spectra of the studied compounds have been obtained. From the analysis of the absorption spectra in polarized light, it has been established that the oscillator responsible for the appearance of the electronic absorption band executes vibrations with an average orientation along the stretching direction of the studied foils.

Experimental and Theoretical Investigations of Anode Double Layer

The anodic double layer is studied by electrical methods. Irradiating this layer with an optical electromagnetic radiation, resulted in current intensity oscillations and also an increase in their amplitude. A theoretical model is described on the basis of a nonlinear diffusion equation, and both double layer diameter and characteristic oscillation time were calculated. Theoretical results are in agreement with experimental results.

Shifts of absorption and fluorescence spectra of some anthracene derivatives in binary and ternary solutions

Abstract The pure electronic transition frequencies in absorption and emission bands have been determined for anthracene and some anthracene derivatives when dissolved in a large number of polar and nonpolar solvents. The shifts of the pure electronic transition frequencies when passing from vapour to binary and ternary solutions have been analysed by means of the existing theories based on structure models from the theory of dielectric liquid theory [1–4].

Shifts of Absorption, Fluorescence and NMR Spectra of Some 2-Hydroxyacetophenone Derivatives in Binary and Ternary Solutions.

Abstract The shifts of the absorption electronic (1 Lb) and fluorescence bands, for the solutions in polar and nonpolar solvents of some 2-hydroxyacetophenone derivatives have been investigated. The changes of frequency maxima of the fluorescence and absorption electronic bands with the signal in NMR spectra for the Ha proton were correlated.

On the influence of the external optical radiation upon anode double layers

The obtained results demonstrate that the changes in the parameters (frequency, amplitude) of electrical oscillations generated in an anode double layer can be used as optical detectors when the anode glow is irradiated with an external optical electromagnetic wave. It has been demonstrated that the local electrical properties of an anode glow have changed under the influence of electromagnetic radiation.

LIDAR Measurements Comparison Of Two Volcanic Eruptions: Environmental Influences Upon The Romanian Territory

Abstract The eruption of both the Eyjafjallajokull (April 2010) and Grimsvotn (May 2011) volcanoes cumulated with two moments that gave headaches to the authorities and air traffic, and their impact on the environment upon Iasi region have been studied by means of different tools evidencing the complexity of the phenomena. In order to evidence the intrusion of pollutants in the cloud systems and to obtain additional data on the intrusion when the ash cloud was over our country, LIDAR measurements, meteorological (NMA), Satellite data (EUMETSAT), and various forecasting models (ECMWF, VAAC-Met Office, HYSPLIT) have been used. The new 3D Atmospheric Observatory Site of the Alexandru Ioan Cuza University of Iasi, as part of RADO (Romanian Atmospheric 3D Observatory) is presented, too.

Study of the anode plasma double layer: optogalvanic detectors

The experimental and theoretical results show that the anode double layer (DL) is a very sensitive plasma formation suitable for fine optogalvanic studies. The obtained results demonstrate that the parameters of the oscillations sustained by a DL (frequency, amplitude) can be used as optogalvanic detectors.