Evaluation of the shadowband effect on a 2pi spectroradiometer

A method of correcting for a shadowband is presented, whatever the rotation axis orientation; the only proviso is that it lie in the horizontal plane.

Atmospheric correction of data measured by a flying platform over the sea: elements of a model and its experimental validation

A model for the atmospheric correction of data remotely sensed over the sea at different altitudes is described in detail and validated through experimental data measured in the North Adriatic Sea during the Adria 83 campaign by a modular multispectral scanner.

Spectroradiometer for ground-based atmospheric measurements related to remote sensing in the visible from a satellite

A spectroradiometer was developed for use on the ground and aboard ship. The instrument separates global and diffuse solar radiation with a rotating shading band. Calibration results are compared with those of other sun photometers. The instrument was also mounted on a stabilized platform during an experimental trial aboard ship on the Tyrrhenian Sea. Results are comparable with those obtained by handheld sun photometer.

Aerosol size spectra from spectral extinction data: the use of a linear inversion method

A modification of the Twomey-Phillips linear constrained inversion method is used to retrieve aerosol size spectra from simulated spectral optical depths in the wavelength range from 0.37 to 2.2 microm. It is found that the transition between nonphysical solutions to well-behaved ones, which is driven by the smoothing parameter gamma is gradual and that negative components, when present in the solution, always belong to the smallest particle range. When values of gamma greater than 0.05 are required to obtain well-behaved solutions, a strong bias on the retrieved solution is posed by the form of the first-guess solution. Moreover, even if the retrieved size distribution computed for low values of gamma is not well-behaved, much information on the shape of the true solution in the medium and large particle range is contained in the retrieved solution. The effect of realistic random errors added to the simulated optical depths is also discussed.

Experience with psoriasis in a psychosomatic dermatology clinic

We studied 179 psoriatic patients by semistructured colloquia and psychometric tests and determined their cutaneous psycho-neurophysiological profiles by biofeedback methods. The Paykel scale for stressful events showed that 72% of psoriatics had experienced significant stressful events about one month before the appearance of the psoriasis. The Zung test for anxiety and depression showed a high level of anxiety in the psoriatic patients. 64% of the patients who were treated by BFBtraining had a decrease in their PASI index for severity and the extent of the disease and also fewer recurrences at the one-year follow-up. The results of the World Experience Inventory indicated difficulties related to body image and to relationships with others. Psoriasis influenced the sexuality of the patients. It is always difficult when one is afflicted by ill health to enjoy life and the general scores of SWL (Satisfaction with Life), were significantly lower than those of a control group.