Narrow-Band Frequency Analysis for Laser-Based Glass Thickness Measurement

As part of a Coordinated Textile Industry Noise Reduction Program, a study of the sources of spinning frame noise has been conducted. Techniques of source modification and narrow-band frequency analysis were used. Several machines were studied. Major noise sources were found to be the ring-traveler and spindle-bobbin systems. Other sources identified were the drive cylinder, drive tapes, idler pulleys, vacuum system, and gears. Relative importance of the sources and differences among machines is discussed. Suggestions are offered for ways to reduce noise from some of the sources. Work is continuing to evaluate and develop the most feasible methods of spinning frame noise reduction.

Download Full-text

Strip-Chart Recording of Narrow Band Frequency Analysis in Aid of Ethnomusicological Data

Yearbook of the International Folk Music Council ◽

10.2307/767678 ◽

1972 ◽

Vol 4 ◽

pp. 119

Author(s):

Stephen Erdely ◽

Robert A. Chipman

Keyword(s):

Frequency Analysis ◽

Narrow Band ◽

Band Frequency ◽

Strip Chart ◽

Strip Chart Recording ◽

Chart Recording

Download Full-text

Coordinated diameter oscillations at arteriolar bifurcations in skeletal muscle

AJP Heart and Circulatory Physiology ◽

10.1152/ajpheart.1987.253.3.h568 ◽

1987 ◽

Vol 253 (3) ◽

pp. H568-H573 ◽

Cited By ~ 5

Author(s):

J. U. Meyer ◽

L. Lindbom ◽

M. Intaglietta

Keyword(s):

Skeletal Muscle ◽

Fundamental Frequency ◽

Narrow Band ◽

Photometric System ◽

Band Frequency ◽

Skeletal Muscle Microcirculation

The spontaneous rhythmical luminal changes (vasomotion) at bifurcations in the microvasculature of the rabbit tenuissimus muscle were investigated by means of a microscope video photometric system. Video scenes, containing two terminal arterioles originating from one transverse arteriole, showed that adjacent terminal arterioles constricted synchronously in 26 out of 31 contraction cycles. The onset of 60 constrictions in the parent transverse vessels was synchronized with the activity in terminal arterioles in 75% of the cycles and delayed in 25%. Vasomotion in the parent transverse vessels was notably smaller than in the terminal vessels. All the terminal arterioles in the different animals oscillated at the fundamental frequency of 18.9 +/- 3.5 cycles/min. We conclude that in the skeletal muscle microcirculation 1) coordinated spontaneous diameter oscillations occur in arterioles that are in proximity, 2) diameter changes are most pronounced in the terminal arterioles, and 3) coordinated vasomotion in this tissue exhibits a characteristic narrow band frequency. The presence of a microvascular pacemaker is hypothesized.

Download Full-text