Frequency dependent streaming potentials were measured on a glass capillary, porous filter, and a sample of Boise sandstone. The pore diameters for these three samples range from 1 millimeter to 34 micrometers. The frequencies used in these experiments range from 0-600 Hz with the critical frequencies being 6.8 Hz, 90 Hz, and 400 Hz for the three specimens. The fluid was moved relative to the s...

BACKGROUND This paper presents a case study of an automated clinical laboratory in a large urban academic teaching hospital in the North of Italy, the Spedali Civili in Brescia, where four laboratories were merged in a unique laboratory through the introduction of laboratory automation. MATERIALS AND METHODS The analysis compares the preautomation situation and the new setting from a cost per...

Pure tones of 1, 2, 4, 8, and 10 kHz were broadcast from the body of a dead starling Sturnus vulgaris, and sound pressure levels were measured through 360” in three planes. At high frequencies (8 and 10 kHz) there were large troughs in sound pressure levels in the acoustic “shadow” of the bird’s body. A physical model based on sound interference phenomena predicts similar patterns of sound pres...

It is demonstrated that a novel heating configuration applied to a large and cold magnetized plasma allows the study of avalanche phenomena under controlled conditions. Intermittent collapses of the plasma pressure profile, associated with unstable drift-Alfvén waves, exhibit a two-slope power-law spectrum with exponents near -1 at lower frequencies and in the range of -2 to -4 at higher freque...