Influence of Strip-Mining on the Mortality of a Wetland Caddisfly, \u3ci\u3eLimnephilus Indivisus\u3c/i\u3e (Trichoptera: Limnephilidae).

A coal mine about 2.2 km upstream from Stillfork Swamp Nature Preserve, Carroll Co., Ohio was suspected of causing a reduction in Limnephilus indivisus caddisflies in the south half of the preserve. Second instar L. indivisus larvae collected from the south half of the preserve and from two control areas were reared in cages at the site of collection and at the other two sites in a replicated experiment. Elevated total dissolved solids in water samples from within rearing enclosures displayed strong correlation (r2 = 0.864) with increased mortality when compared to larvae reared in unaffected areas. This investigation suggests that larvae of L. indivisus are useful in biomonitoring of wetlands impacted by acid-mine drainage, and potentially other perturbations

Adaptive system and method for signal generation Patent

Adaptive signal generating system and logic circuits for satellite television system

CC178 Revised 1971 Certified Crop Varieties Suggested for Nebraska 1971

Campaign Circular 178 Revised 1971: Certified Crop Varieties suggested fpr Nebraska in 1960, talks about the variations of crops in Nebraska

CC178 Revised 1972

Campaign Circular 178 Revised 1972: Certified Crop Varieties suggested for Nebraska in 1960, talks about the variations of crops in Nebraska such as : small grains, sorghums, soybeans, legumes, grasses, cor

CC178 Revised 1985 Crop Varieties Suggested for Nebraska 1985

Campaign Circular 178 Revised 1985 Certified Crop Varieties Suggested for Nebraska 1985, talks about the variations of crops in Nebraska such as small grains, sorghums, soybeans, legumes, grasses, corn

CC178 Revised 1972

Campaign Circular 178 Revised 1972: Certified Crop Varieties suggested for Nebraska in 1960, talks about the variations of crops in Nebraska such as : small grains, sorghums, soybeans, legumes, grasses, cor

Protocols for calibrating multibeam sonar

Author Posting. © Acoustical Society of America, 2005. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 117 (2005): 2013-2027, doi:10.1121/1.1869073.Development of protocols for calibrating multibeam sonar by means of the standard-target method is documented. Particular systems used in the development work included three that provide the water-column signals, namely the SIMRAD SM2000/90- and 200-kHz sonars and RESON SeaBat 8101 sonar, with operating frequency of 240 kHz. Two facilities were instrumented specifically for the work: a sea well at the Woods Hole Oceanographic Institution and a large, indoor freshwater tank at the University of New Hampshire. Methods for measuring the transfer characteristics of each sonar, with transducers attached, are described and illustrated with measurement results. The principal results, however, are the protocols themselves. These are elaborated for positioning the target, choosing the receiver gain function, quantifying the system stability, mapping the directionality in the plane of the receiving array and in the plane normal to the central axis, measuring the directionality of individual beams, and measuring the nearfield response. General preparations for calibrating multibeam sonars and a method for measuring the receiver response electronically are outlined. Advantages of multibeam sonar calibration and outstanding problems, such as that of validation of the performance of multibeam sonars as configured for use, are mentioned.Support by the National Science Foundation through Award No. OCE-0002664, NOAA through Grant No. NA97OG0241, and the Cooperative Institute for Climate and Ocean Research (CICOR) through NOAA Contract No. NA17RJ1223 is acknowledged