Lincoln, NE, United States
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Dorn B.,University of Nebraska at Omaha | Babb D.,Omaha North High School | Nizzi D.M.,Westside High School Career Center | Epler C.M.,Lincoln
SIGCSE 2015 - Proceedings of the 46th ACM Technical Symposium on Computer Science Education | Year: 2015

Access to high quality K-12 computer science education has garnered considerable public attention in the United States in the wake of's December 2013 Hour of Code. An increasing number of states are now counting CS coursework towards high school graduation requirements, and teacher certification for computing courses is being revisited across the country. In this work, we explore the current state of computer science education in Nebraska public schools using objective enrollment data from the 2013-2014 academic year. We find limited access to introductory programming courses, while basic computer/IT literacy coursework is commonplace. Lack of CS courses is particularly acute in small schools, which make up a majority of Nebraska's public schools. We also present data illustrating limited pursuit of IT teaching endorsement/certification in the state and highlight current issues for teacher training programs that lead to such certification in Nebraska. Copyright © 2015 ACM.

Lindsey P.A.,University of Pretoria | Havemann C.P.,University of Pretoria | Lines R.,Namibian Nature Foundation | Palazy L.,Biometrie et Biologie Evolutive | And 4 more authors.
PLoS ONE | Year: 2013

Changing land use patterns in southern Africa have potential to dramatically alter the prospects for carnivore conservation. Understanding these influences is essential for conservation planning. We interviewed 250 ranchers in Namibia to assess human tolerance towards and the distribution of large carnivores. Cheetahs (Acinonyx jubatus), leopards (Panthera pardus) and brown hyaenas (Hyaena brunnea) were widely distributed on Namibian farmlands, spotted hyaenas (Crocuta crocuta) had a narrower distribution, and wild dogs (Lycaon pictus) and lions (Panthera leo) are largely limited to areas near source populations. Farmers were most tolerant of leopards and least tolerant of lions, wild dogs and spotted hyaenas. Several factors relating to land use correlated consistently with carnivore-presence and landowner tolerance. Carnivores were more commonly present and/or tolerated where; wildlife diversity and biomass were higher; income from wildlife was higher; income from livestock was lower; livestock biomass was lower; in conservancies; game fencing was absent; and financial losses from livestock depredation were lower. Efforts to create conditions whereby the costs associated with carnivores are lowest, and which confer financial value to them are likely to be the most effective means of promoting carnivore conservation. Such conditions are achieved where land owners pool land to create conservancies where livestock are replaced with wildlife (or where livestock husbandry is improved) and where wildlife generates a significant proportion of ranch income. Additional measures, such as promoting improved livestock husbandry and educational outreach efforts may also help achieve coexistence with carnivores. Our findings provide insights into conditions more conducive to the persistence of and tolerance towards large carnivores might be increased on private (and even communal) lands in Namibia, elsewhere in southern and East Africa and other parts of the world where carnivore conservation is being attempted on private lands. © 2013 Lindsey et al.

Irmak S.,University of Nebraska - Lincoln | Specht J.E.,Lincoln | Odhiambo L.O.,University of Nebraska - Lincoln | Rees J.M.,UNL Clay County | Cassman K.G.,University of Nebraska - Lincoln
Transactions of the ASABE | Year: 2014

Soybean [Glycine max (L.) Merr.] yield, irrigation water use efficiency (IWUE), crop water use efficiency (CWUE), evapotranspiration water use efficiency (ETWUE), and soil water extraction response to eleven treatments of full, limited, or delayed irrigation versus a rainfed control were investigated using a subsurface drip irrigation (SDI) system at a research site in south-central Nebraska. The SDI system laterals were 0.40 m deep in every other row middle of 0.76 m spaced plant rows. Actual evapotranspiration (ET a) was quantified in all treatments and used to schedule irrigation events on a 100% ETa replacement basis in all but three of the eleven treatments (i.e., 75% ETa replacement was used in two, and 60% ETa replacement was used in one). The irrigation amount (Ia) applied at each event was 100% of the ETa amount, except for two 100% ET a treatments in which only 65% or 50% of the water needed to cover the treatment plot area was applied to enable a test of a partial surface area-based irrigation approach. The first irrigation event was delayed until soybean stage R3 (begin pod) in two 100% Ia treatments, but thereafter they were irrigated with either 100% or 75% ETa replacement. Two 100% ET a and 100% Ia treatments also were used to evaluate soybean response to nitrogen (N) application methods (i.e., a preplant method versus N injection using the SDI system). Soybean ETa varied from 452 mm for the rainfed treatment to 600 mm (30% greater) for the fully irrigated treatment (100% ETa and 100% Ia) in 2007, and from 473 to 579 mm (20% greater) for the same treatments, respectively, in 2008. Among the irrigated treatments, 100% ETa and 65% Ia had the lowest 2007 ETa value (557 mm), whereas 100% ETa and 50% Ia had the lowest 2008 ETa (498 mm). The 100%, 75%, and 60% ETa treatments with 100% Ia had respective actual ETa values that declined linearly in 2008 (i.e., 579, 538, and 498 mm), but not in 2007. Seasonal totals for ETa versus Ia exhibited a linear relationship (R2 = 0.68 in 2007 and R2 = 0.67 in 2008). Irrigation enhanced soybean yields from rainfed yield baselines of 4.04 ton ha-1 in 2007 and 4.82 ton ha -1 in 2008) to a maximum of 4.94 ton ha-1 attained in 2007 with the delay to R3 irrigation treatment (its yield was significantly greater, p < 0.05, than that of the seven other treatments) and 4.97 ton ha-1 attained in 2008 with the 100% ETa and 100% Ia preplant N treatment. Seed yield had a quadratic relationship with irrigation water applied and a linear relationship with ETa that was stronger in the drier year of 2007. Each 25.4 mm incremental increase in seasonal irrigation water applied increased soybean yield by 0.323 ton ha -1 (beyond the intercept) in 2007 and by 0.037 ton ha-1 in 2008. Each 25.4 mm increase in ETa generated a yield increase of 0.114 ton ha-1 (beyond the intercept) in 2007, but only 0.02 ton ha-1 in the wetter year of 2008. This research demonstrated that delaying the onset of irrigation until the R3 stage and practicing full irrigation thereafter for soybean grown on silt loam soils resulted in yields (and crop water productivity) that were similar to full-season irrigation scheduling strategies, and this result may be applicable in other regions with edaphic and climatic characteristics similar to those in south-central Nebraska. © 2014 American Society of Agricultural and Biological Engineers.

Moses W.J.,University of Nebraska - Lincoln | Gitelson A.A.,University of Nebraska - Lincoln | Perk R.L.,University of Nebraska - Lincoln | Gurlin D.,University of Nebraska - Lincoln | And 4 more authors.
Water Research | Year: 2012

Algorithms based on red and near infra-red (NIR) reflectances measured using field spectrometers have been previously shown to yield accurate estimates of chlorophyll-a concentration in turbid productive waters, irrespective of variations in the bio-optical characteristics of water. The objective of this study was to investigate the performance of NIR-red models when applied to multi-temporal airborne reflectance data acquired by the hyperspectral sensor, Airborne Imaging Spectrometer for Applications (AISA), with non-uniform atmospheric effects across the dates of data acquisition. The results demonstrated the capability of the NIR-red models to capture the spatial distribution of chlorophyll-a in surface waters without the need for atmospheric correction. However, the variable atmospheric effects did affect the accuracy of chlorophyll-a retrieval. Two atmospheric correction procedures, namely, Fast Line-of-sight Atmospheric Adjustment of Spectral Hypercubes (FLAASH) and QUick Atmospheric Correction (QUAC), were applied to AISA data and their results were compared. QUAC produced a robust atmospheric correction, which led to NIR-red algorithms that were able to accurately estimate chlorophyll-a concentration, with a root mean square error of 5.54mgm -3 for chlorophyll-a concentrations in the range 2.27-81.17mgm -3. © 2011 Elsevier Ltd.

Appiah J.,Virginia Transportation Research Council | Naik B.,Ohio University | Rilett L.R.,University of Nebraska - Lincoln | Sorensen S.,Lincoln
Proceedings of the Institution of Civil Engineers: Transport | Year: 2016

Current practice in microsimulation model calibration is focused almost exclusively on adjusting parameters of driving behaviour (car-following and lane-changing) logic. Often, default parameter values are used for the vehicle performance logic. Where significant differences exist between the default vehicle performance characteristics and those of the local traffic, results from microsimulation analyses can be misleading, especially for networks with reasonable truck traffic. This paper presents an approach for incorporating the unique operating characteristics of the local truck fleet into the calibration process of microsimulation models. In particular, the desired acceleration and deceleration functions for trucks are treated as unknowns that must be estimated as part of the model calibration. The methodology is general and is implemented on a test bed using the VISSIM traffic microsimulation software to demonstrate its applicability. Results of the implementation highlight the need for, and the potential benefits of, calibrating both the vehicle performance and the driver behaviour parameters. © 2016, Thomas Telford Services Ltd. All rights reserved.

Van Den Broeke M.S.,University of Nebraska - Lincoln | Van Den Broeke C.A.,Lincoln
Weather and Forecasting | Year: 2015

A family of four waterspouts was produced by a convective cell over western Lake Michigan on 12 September 2013. This storm initiated along a boundary north of a mesolow in a low-level cold-air advection regime, and developed supercell characteristics once the second waterspout was in progress. Polarimetric characteristics of the storm, and of the development of supercell character, are presented. These observations represent the first documented polarimetric radar observations of waterspout-producing convection in the Great Lakes region. Unusually high differential reflectivity values accompanied this storm and its initiating boundary. The high values along the boundary are partially explained by a high density of dragonflies. High differential reflectivity values were present through much of the storm of interest despite very low aerosol concentration at low levels in the lake-influenced air mass. Finally, this case illustrates the importance of environmental awareness on waterspout-favorable days, especially when boundaries are nearby to serve as a potential source of enhanced environmental vertical vorticity. © 2015 American Meteorological Society.

Purpose – The purpose of this paper is to examine how the combined crime rate and staffing levels of a patrol area affect patrol officers’ productivity. Specifically, the author identified and analyzed two macro-level correlates of patrol officer productivity: reported violent crimes per officer and reported property crimes per officer (a beat’s “crime-to-cop” ratios). Design/methodology/approach – Using hierarchical linear modeling, the author estimated the effects of a patrol area’s violent crimes per officer ratio and property crimes per officer ratio on the annual number of traffic citations, warrants, misdemeanor arrests, and felony arrests generated by patrol officers (n=302). The author also examined the effect of these crime-to-cop ratios on a more advanced productivity metric. Findings – The results suggest that a patrol area’s rate of property crimes per officer is associated with a moderate decrease in an officer’s annual number of traffic citations, warrant arrests, and misdemeanor arrests; a patrol area’s rate of violent crimes per officer is also associated with a moderate decrease in an officer’s annual number of traffic citations; and a patrol area’s rate of violent crimes per officer is associated with a moderate increase in an officer’s annual number of warrant and misdemeanor arrests. Notably, the crime-to-cop ratios are not correlated with a more sophisticated patrol productivity metric. Research limitations/implications – The author analyzed data from a mid-sized US police department that uses a generalists policing style. It is unknown if these results translate to smaller or larger police departments, as well as those agencies practicing a specialized policing style. Practical implications – The findings suggest that police scholars should not only recognize how the crime-to-cop ratios of a patrol area might impact patrol officer productivity, but also incorporate more sophisticated metrics of patrol officer activity in future studies. These findings likewise signal to police practitioners that an area’s crime-to-cop ratios should be considered when allocating officers and other resources across patrol areas. Originality/value – To the authors knowledge, this is the first study to identify and examine the link between a patrol area’s crime-to-cop ratios and patrol officer productivity. © 2016, © Emerald Group Publishing Limited.

PubMed | Lincoln.
Type: Journal Article | Journal: Nursing standard (Royal College of Nursing (Great Britain) : 1987) | Year: 2017

I write as an ex-RAF nursing sister and war widow who lost my husband in a Vulcan bomber crash in 1975. There are many more recent war widows who need our help, including the relatives of the Nimrod explosion in Afghanistan in 2006, which killed 14 members of the armed forces.

PubMed | Lincoln.
Type: Journal Article | Journal: Nursing standard (Royal College of Nursing (Great Britain) : 1987) | Year: 2016

I have seen first-hand over 15 years the care of older people in nursing homes in the UK. Their care is a national disgrace. With most nursing homes being run solely for profit, they have minimal trained staff and all too often offer poor care, inferior food and few activities for residents.

PubMed | Lincoln.
Type: Journal Article | Journal: Nursing standard (Royal College of Nursing (Great Britain) : 1987) | Year: 2017

I have been shocked by the allegations of abuse by Sir Jimmy Savile and how he got away with it for so long (letters October 24).SAVILE I have been shocked by the allegations of abuse by Sir Jimmy Savile and how he got away with it for so long (letters October 24).

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