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Press releases 1995

On December 2, 1995, the SOHO space probe (Solar and Heliospheric Observatory) was successfully started from Cape Canaveral. On board are instruments for measuring the solar vacuum-ultraviolet (VUV) radiation, which were calibrated by the Physikalisch-Technische Bundesanstalt with the aid of the Berlin BESSY I electron storage ring.

The SOHO space probe is a cornerstone of the joint...

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To meet the ever increasing demands placed on the accuracy of measurement in research and industry, ever more physical units are traced back to fundamental constants. This traceability is already ensured for most of these units such as, for example, the unit of length, the metre, and the unit of electric resistance, the ohm. Profound knowledge of the fundamental constants is an essential...

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The Physikalisch-Technische Bundesanstalt (PTB) has been entrusted by the Time Act of 1978 to realize and distribute the legal time for the Federal Republic of Germany. For this purpose, the PTB developed four cesium atomic clocks whose time readings differ by less than one millionth second per year. It is on these atomic clocks that Germany's legal time is based today.

Our everyday life is,...

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Owing to the considerable improvement of the operational conditions in the new clean-room centre of the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig, the Laboratory for Thin-layer Structures has succeeded in optimizing the circuits for Josephson voltage standards to such a degree that stable d.c. voltages greater than 10 Volt are supplied.

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