Engineering topics

Hauser, M. G.

Publications and source records attributed to Hauser, M. G..

57 records · Page 4

NASA NTRS1974

Statistical analysis of catalogs of extragalactic objects. III - The Shane-Wirtanen and Zwicky catalogs

Statistical investigation of clustering in the galaxy catalogs compiled by Zwicki et al. (1961-1968) and Shane and Wirtanen (1967). The covariance and power spectrum of the angular distributions are estimated. The space region surveyed in the Zwicki catalog is found to represent a 'fair sample of the universe' in that the statistical nature of the clustering in this catalog is found to be mirrored at smaller angular scales in the deeper survey of Shane and Wirtanen.

Peebles, P. J. E.↗

NASA NTRS1974

DC responsivity of proximity effect bridges to high frequency radiation

The effect of microwave radiation on the dc current-voltage characteristic of proximity effect bridges has been studied at frequencies of 10, 35, and 90 GHz. The properties of bridges fabricated in layered films of Nb and Ta are reported. The fraction, epsilon, of the incident radiant power absorbed by the bridge is measured calorimetrically, permitting determination of the intrinsic responsivity (volts per watt of power absorbed when operated in a current-biased mode). In the test geometry employed, epsilon is typically about .0001 for a 0.1 ohm Nb-Ta bridge, and increases roughly linearly with dc junction resistance. Broad-band responsivity is generally independent of incident power, increases with increasing critical current (decreasing temperature), and decreases with increasing frequency. Peak responsivities achieved to date are about 100,000 V/W (absorbed) at 10 GHz and about 100 V/W (absorbed) at 90 GHz.

Hauser, M. G.↗

NASA NTRS1973

Statistical analysis of catalogs of extragalactic objects. II - The Abell catalog of rich clusters

The results of a power-spectrum analysis are presented for the distribution of clusters in the Abell catalog. Clear and direct evidence is found for superclusters with small angular scale, in agreement with the recent study of Bogart and Wagoner (1973). It is also found that the degree and angular scale of the apparent superclustering varies with distance in the manner expected if the clustering is intrinsic to the spatial distribution rather than a consequence of patchy local obscuration.

Hauser, M. G.↗