Profile of North Dakota's Coal Mine and Electric Power Plant Operating Work Force

This report is a continuation of research on the economic and social effects of coal development in western North Dakota. The purpose of the report is to provide a profile of the characteristics of the operating work force in North Dakota's coal mines and electric power generating plants.Labor and Human Capital, Resource /Energy Economics and Policy,

Living Within Opaque Worlds: The Balkanized Experiences of Collegiate Minority Student-Athletes

A long-term study yielded recommendations for college-wide policies to enhance mainstreaming and ameliorate against institutional balkanization of minority student-athletes

Curling Burley Tobacco from an Automated Harvesting System

If burley tobacco can be successfully cured at high density under waterproof covers in the field, a producer can expand production without the necessity of building new curing barns and can thereby more easily justify investment in the automated burley tobacco harvesting system (Wells et al., 1990a, b). Curing under waterproof covers in the field and curing on frames in the barn were evaluated over three curing seasons using two varieties (KY 14 and TN 86), two plant densities (32 and 43 plants/m2, 3 and 4 plants/ft2), position of tobacco on the frame (four levels ranging from edge to center) and stalk position (bottom, middle and top). Conventionally cured tobacco was used as the standard of comparison and grade index was used as the assessment of quality. Averaged over a three-year period, burley tobacco cured in the field over sod and under waterproof covers and conventionally cured tobacco were of equal quality (56.0 and 55.8 grade index, respectively) and were both superior to tobacco cured on frames in the barn (52.0). During the dry curing season, burley tobacco cured under the covers had a higher grade index (54.9) than that cured conventionally (43.5) or on frames in the barn (43.7) but during the moderately wet and wet curing seasons, conventionally cured burley tobacco had a higher grade index (62.3 and 61.5, respectively) than that cured under covers (58.9 and 54.2, respectively) or on frame in the barn (59.0 and 53.4, respectively). During the wet curing season, leaf tips near the sod in the field and near the concrete in the barn cured dark red resulting in a lowered grade index. Burley tobacco from the automated harvesting system is better cured outside under waterproof covers than cured in a barn

Traction Characteristics of Prepared Traffic Lanes

Traction characteristics of lugged and smooth tires were compared on prepared traffic lanes and on conventional seedbed conditions. Results indicated that elevated traffic lanes offer important traction advantages over seedbeds in wet soil conditions. In dry soil conditions, traction on elevated traffic lanes was sometimes less than on the seedbed conditions. A timeliness advantage in mobility for the elevated traffic lanes was found to be up to 2 days in extremely wet conditions. A non-elevated traffic lane showed no traction advantage in wet conditions

Wind Drag on Burley Tobacco Plants

Drag coefficient and center of resistance to wind forces were determined for four varieties of burley tobacco at three stages of growth and using wind velocities ranging from about 3 to 17 m/s. Drag coefficients determined ranged from about 0.024 at the highest velocity to about 0.081 at the lowest velocity. Stage of growth and wind velocity had significant effects on drag coefficient. Variety did not have a significant effect on drag coefficient. Mean center of resistance varied from 42.3 percent of the distance from bottom leaf to top leaf at the early stage of growth to 71.2 percent at harvest stage. Center of resistance was significantly affected by variety, stage of growth, and wind velocity

The effect of summertime shelf break upwelling on nutrient flux in southeastern United States continental shelf waters

Gulf Stream-induced upwelling at the shelf break of the South Atlantic Bight (SAB) presents water which, in summer, can intrude onto the continental shelf. In July 1979, an XBT survey of the continental shelf revealed such an intrusion of cold water off St. Augustine, Florida. From weekly mappings, it was determined that Gulf Stream water \u3c22.5°C covered 3280 km2 and occupied 38 km3 shoreward of the 42 m isobath. Using temperature and nitrate distributions and the T°C:NO3 relationship, we determined that 3200 metric tons of nitrate-nitrogen were advected into the study area. Net nitrate-nitrogen fluxes were 32 μmoles · m−2 · sec−1 across the 42 m isobath and 30 μmoles · m−2 · sec−1 across the 30 m isobath.The advection of nitrate-enriched water into the photic zone caused a dramatic increase in phytoplankton biomass. The decreasing nitrate concentrations correlated with chlorophyll increases indicating phytoplankton production was mainly at the expense of nitrate advected into the area. Prior to the intrusion, production was likely supported by regenerated nutrients.Summertime intrusions supply an estimated 2.9 × 104 mtons NO3-N · yr−1 to the middle shelf area of the southern SAB and are thus a major source of nitrogen to that area

Football Game Program 3 1965

Football Game Program 3 196