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Sub-diurnal Earth rotation variations observed by VLBI

Nilsson T., Böhm J., Schuh H.

Artificial Satellites : Journal of Planetary Geodesy

2010

Vol. 45, No. 2

49--55

We analyse sub-diurnal Earth rotation variations obtained from the continuous VLBI experiments CONT02, CONT05, and CONT08. We find that the Earth rotation parameters estimated from these campaigns contain signals with periods ±12 hours, +24 hours, and in CONT02 also -8 hours, which cannot be explained by the current IERS sub-diurnal pole model. We investigate if these signals could be caused by atmospheric excitations, but find that these excitations are too small.

Symptoms and Clinical Findings From the Musculoskeletal System Among Operators at a Call Centre in Sweden-A 10-Month Follow-Up Study

Toomingas A., Nilsson T., Hagberg M., Hagman M., Tornqvist E. W.

International Journal of Occupational Safety and Ergonomics

2003

Vol. 9, No. 4

405--418

The musculoskeletal health among 57 operators at 1 call centre in Sweden was studied with 10 monthly follow-ups, parallel to a reference group of 1,226 professional computer users in other occupations. Operators at this call centre were more symptom-loaded than the other professional computer users in spite of their younger age and shorter exposure to computer work. Symptoms were long-lasting or recurrent. Muscle tenderness and nerve affections in the neck-shoulder region were the most common specific findings and diagnoses at medical examination of incident symptom cases. More extensive studies should be done on the working conditions and health status among call centre workers.