Lars B. Bååth

Electro-optical effect in films of azobenzene polycomplexes with cobalt

Polymeric films containing azobenzene fragments with donor and acceptor groups were produced as well as films of polycomplexes of these fragments with cobalt. Absorption spectra of these films before and during application of an external electric field were investigated. Electro-optical properties of the films are conditioned by spatial reorientation of dipole moments of azobenzene groups induced by polarized light in an external electric field. Increase in dipole moments of azobenzene groups reduces the influence of cobalt ions on the electro-optical properties of the polycomplex films. In the proposed phenomenological model, the electro-optical effect is explained by effect of induced forces upon azobenzene isomers and metallic ions.

Multifrequency interferometer and radio continuum monitoring observations of CTA 102

This paper represents the work of several years of observation of CTA 102 with both single dish telescopes and interferometric arrays, covering wavelengths from 1.2 cm to 1.3 mm. The resolution of the maps covers an order of magnitude from 0.5 mas to 50 μ as. The images presented demonstrate the rapid structural changes in this source. These rapid structural changes correlates with the outbursts seen in the total flux, turnover frequency and in the spectral index. We have calculated the Brightness Temperatures of the components ( T B ) directly from the determined component sizes and also using the logarithmic variability amplitudes and timescales to calculate the

Thermal influence on passing of polarized light through the SnO2:In2O3 layers

T_{\mathrm{B}}

Viewing angles in some selected BL Lac objects

s. Both the methods yielded measurements of source frame T B s no higher than ~a

Structural Changes in CTA102

\rm few\times 10^{12}

To see what you cannot see

K. We find that the observed average proper motion is ~

Sub-milliarcsecond radio structure of three quasars

0.4 \pm 0.07

Site Survey for a Large Southern Array

mas/yr, which corresponds to an apparent transverse velocity of

High dynamic range VLBI observations of NGC 6251

11 \pm 2

50 μas resolution VLBI images of AGN's at λ3 mm

c.