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.

Giant Electroresistance in Ferroelectric Tunnel Junctions

Abstract: The interplay between the electron transport in metal-ferroelectric-metal junctions with ultrathin ferroelectric barriers and the polarization state of a barrier is investigated. Using a model which takes into account screening of polarization charges in metallic electrodes and direct quantum tunneling across a ferroelectric barrier, we calculate the change in the tunneling conductance associated with the polarization switching. We find the conductance change of a few orders of magnitude for metallic electrodes with significantly different screening lengths. This giant electroresistance effect is the consequence of a different potential profile seen by transport electrons for the two opposite polarization orientations.

Co‐innovation: convergenomics, collaboration, and co‐creation for organizational values

Abstract: Purpose – The aim of this paper is to present a macro view of the evolution of innovation for value creation, from the closed to collaborative, open, and now co‐innovation. It reviews several mega trends that have dramatically changed the dynamic nature of the global market place and also several new forces that have made innovation imperative for organizational value creation.Design/methodology/approach – The paper provides a conceptual overview of co‐innovation through some of its basic elements such as convergence revolution, collaboration, and co‐creation with stakeholders.Findings – Co‐innovation is a new innovation paradigm where new ideas and approaches from various internal and external sources are integrated in a platform to generate new organizational and shared values. The core of co‐innovation includes engagement, co‐creation, and compelling experience for value creation. Thus, the practices of co‐innovative organizations are difficult to imitate by competition.Practical implications – Innovat...

Increased probability of extinction due to decreased genetic effective population size: experimental populations of clarkia pulchella.

Abstract: We established replicated experimental populations of the annual plant Clarkia pulchella to evaluate the existence of a causal relationship between loss of genetic variation and population survival probability. Two treatments differing in the relatedness of the founders, and thus in the genetic effective population size (Ne ), were maintained as isolated populations in a natural environment. After three generations, the low Ne treatment had significantly lower germination and survival rates than did the high Ne treatment. These lower germination and survival rates led to decreased mean fitness in the low Ne populations: estimated mean fitness in the low Ne populations was only 21% of the estimated mean fitness in the high Ne populations. This inbreeding depression led to a reduction in population survival: at the conclusion of the experiment, 75% of the high Ne populations were still extant, whereas only 31% of the low Ne populations had survived. Decreased genetic effective population size, which leads to both inbreeding and the loss of alleles by genetic drift, increased the probability of population extinction over that expected from demographic and environmental stochasticity alone. This demonstrates that the genetic effective population size can strongly affect the probability of population persistence.