University of Nebraska–Lincoln

About: University of Nebraska–Lincoln is a education organization based out in Lincoln, Nebraska, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 28059 authors who have published 61544 publications receiving 2139104 citations. The organization is also known as: Nebraska & UNL.

Robotics as Means to Increase Achievement Scores in an Informal Learning Environment

Abstract: This paper reports on a pilot study that examined the use of a science and technology curriculum based on robotics to increase the achievement scores of youth ages 9-11 in an after school program. The study examined and compared the pretest and posttest scores of youth in the robotics intervention with youth in a control group. The results revealed that youth in the robotics intervention had a significant increase in mean scores on the posttest and that the control group had no significant change in scores from the pretest to the posttest. In addition, the results of the study indicated that the evaluation instrument used to measure achievement was valid and reliable for this study.

Defect Engineering in Cubic Cerium Oxide Nanostructures for Catalytic Oxidation

Abstract: Traditional nanostructured design of cerium oxide catalysts typically focuses on their shape, size, and elemental composition We report a different approach to enhance the catalytic activity of cerium oxide nanostructures through engineering high density of oxygen vacancy defects in these catalysts without dopants The defect engineering was accomplished by a low pressure thermal activation process that exploits the nanosize effect of decreased oxygen storage capacity in nanostructured cerium oxides

Soil Properties as Influenced by Phosphorus- and Nitrogen-Based Manure and Compost Applications

Abstract: Manure or compost application based on N needs of corn (Zea mays L.) may result in soil accumulation of P, N, and other ions, since the manure or compost N/P ratio is usually smaller than the corn NIP uptake ratio. This study was conducted from 1992 to 1996 to evaluate the effects of annual or biennial application of N- and P-based composted and noncomposted beef cattle (Bos taurus) feedlot manure on soil properties. Fertilized and unfertilized checks were also included. Soil surface (0-15 cm) pH significantly increased with N-based manure (MN) or compost application (CN), but decreased with NH 4 -N fertilizer application as compared with the check. Soil bulk density was unaffected by manure or compost application. After 4 yr of manure and compost applications, soil surface (0-15 cm) C and N concentrations and quantities were greater for N- than P-based management systems. About 25% of applied manure C and 36% of applied compost C remained in the soil after 4 yr of application, indicating greater C sequestration with composted than noncomposted manure. No significant difference was observed between fertilizer and check plots for soil total C or N. Soil properties in the 15- to 30-em increment were unaffected by the applied treatments except soil electrical conductivity (EC). Residual soil NO 3 to a depth of 1.2 m was greater for inorganic fertilizer than manure and compost treatments in drier years. Soil property changes were greater for the annual or biennial N-based than P-based manure or compost applications, reflecting the differences in application amounts.