PTBnews 2000.3

Optical Frequency Measurements Substantially Simplified Picosecond Voltage Pulses AC Measurements with «Josephson Precision» Recognition of Tests in Explosion Protection New Method for the Price Calculation of Natural Gases Thermal Conductivity of Masonry Units Modern Laboratories in a Historical Building Microlitre Dispensing of Human Blood Serum

Imprint PTBnews00.3 English edition December 2000 Published by Physikalisch-Technischen Bundesanstalt (PTB) Braunschweig and Berlin · Germany

Chief Editor Burkhard Wende PTB, Abbestr. 2-12 D-10587 Berlin Telefon: (+49 30) 3481-480 Fax: (+49 30) 3481-503 Email: ptbnews@ptb.de