A large volume of data (temperatures, densities, concentrations, winds, etc.) has been accumulated showing that in addition to seasonal changes in the thermosphere, annual variations are present and ...have a component that is a function of latitude. It appears that the helium concentrations have much larger variations in the southern hemisphere than in the northern hemisphere; the same holds true for the exospheric temperatures deduced from Ogo 6 data. Similarly, satellite drag data in the 250‐ to 400‐km range indicate that the bulge of density tends to stay over the southern hemisphere, whereas winds deduced from Ogo 4 and 6 data show a tendency to blow northward across the equator. If part of the explanation of these asymmetries can be found in a latitude independent component induced by the changing sun‐earth distance between solstices (Volland et al., 1972; Ching and Chiu, 1972, 1973), the fact that an asymmetry is still present at the equinoxes suggests that this is not the sole cause: more energy seems to be available for the thermosphere in the southern hemisphere during the equinoxes; this may be the result of an asymmetry in the geomagnetic field or an asymmetrical dissipation of tidal waves induced by an asymmetrical worldwide ozone distribution.
Provider: Czech digital library/Česká digitální knihovna - Institution: Academy of Sciences Library/Knihovna Akademie věd ČR - Data provided by Europeana Collections- From accelerometer total density ...data collected during the last minimum of the solar cycle, density scale heights have been extensively computed. Effects of waves dissipation are evidenced on this data set which reflects temperature behaviour. It appears that tides of high orders (or planetary waves) are quite significant and variable.- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
The goal of this study was to evaluate the technical feasibility of sentinel node biopsy in breast cancer and its predictivity of axillary node status.
Between January 1996 and June 1997, 128 ...patients with invasive breast carcinomas, referred to the Cancer Center of Strasbourg and Lyon (France), underwent lymphatic mapping (Patent Blue dye) and sentinel node biopsy followed by axillary clearance (Berg's level I to II).
Sentinel node was identified in 76.5% of cases and was predictive of axillary status in 94.9% of cases. The false negative rate of the procedure was 5.1%. Sentinel lymph node was involved in 43.9% of cases and it was the only one involved in 30.2% of cases. The sensitivity of the procedure was 94% (CI: 95% = 88%-98%) and its specificity 100%.
Actually considered as new attractive procedure under ongoing evaluation in prospective controlled trials, this study confirms the feasibility and reproductibility of lymphatic mapping and sentinel node biopsy, first stage before entering a new era of minimally invasive axillary surgery in breast cancer.
Within recent years, a new satellite technique has been successfully developed for studying the oceans: altimetry. The SEASAT experiment presents a particular interest because of the great accuracy ...of the altimeter data, though its capabilities are bounded by the accuracy of the trajectory restitution. The altimetric signal variations result from both marine and tectonic effects, the discrimination of which may be difficult. In the present study on the western Mediterranean Sea, the altimeter data processing, the satellite trajectory, and the geoid features are considered. The satellite topography of the Mediterranean Sea surface shows irregularities which are 1 order of magnitude greater than the expected oceanic effects and so are mainly connected to the earth structure. In fact, in spite of neglecting the oceanic effects, correlation with emerged land (islands) or immerged land (bathymetry) and also with main tectonic features can be seen. In particular, evidence exists for isostatic compensation of Airy type in the continental margins and oceanic areas.
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