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.

“You Could be the Hundredth Monkey”: Collective Action Frames and Vocabularies of Motive Within the Nuclear Disarmament Movement

Abstract: Building on recent developments by social constructionists, this paper seeks to advance theoretical and empirical understanding of micromobilization processes associated with social movement recruitment and participation. Data derived from a fouryear field study of the nuclear disarmament movement are employed to identify and elaborate four generic vocabularies of motive that emerge via interaction among activists, rank and file supporters, recruits and significant others: vocabularies of (1) severity, (2) urgency, (3) efficacy and (4) propriety. These vocabularies of motive provide movement actors with compelling rationales to take action on behalf of the movement and/or its organizations. The data suggest that peace movement groups cultivate the imputation and avowal of these motives as a means of stimulating collective action. Several implications for future research are offered which draw upon the insights of resource mobilization theory and social constructionism.

Ultrahigh sensitivity of methylammonium lead tribromide perovskite single crystals to environmental gases

Abstract: One of the limiting factors to high device performance in photovoltaics is the presence of surface traps. Hence, the understanding and control of carrier recombination at the surface of organic-inorganic hybrid perovskite is critical for the design and optimization of devices with this material as the active layer. We demonstrate that the surface recombination rate (or surface trap state density) in methylammonium lead tribromide (MAPbBr3) single crystals can be fully and reversibly controlled by the physisorption of oxygen and water molecules, leading to a modulation of the photoluminescence intensity by over two orders of magnitude. We report an unusually low surface recombination velocity of 4 cm/s (corresponding to a surface trap state density of 108 cm−2) in this material, which is the lowest value ever reported for hybrid perovskites. In addition, a consistent modulation of the transport properties in single crystal devices is evidenced. Our findings highlight the importance of environmental conditions on the investigation and fabrication of high-quality, perovskite-based devices and offer a new potential application of these materials to detect oxygen and water vapor.

The Exponentiated Type Distributions

Abstract: Gupta et al. [Commun. Stat., Theory Methods 27, 887–904, 1998] introduced the exponentiated exponential distribution as a generalization of the standard exponential distribution. In this paper, we introduce four more exponentiated type distributions that generalize the standard gamma, standard Weibull, standard Gumbel and the standard Frechet distributions in the same way the exponentiated exponential distribution generalizes the standard exponential distribution. A treatment of the mathematical properties is provided for each distribution.

Enhanced tunnelling electroresistance effect due to a ferroelectrically induced phase transition at a magnetic complex oxide interface

Abstract: The tunnelling electroresistance effect that occurs at ferroelectric tunnel junctions could form the basis for a class of potential memory applications Now, an enhanced effect is observed in a complex oxide interface as a result of a ferroelectrically induced phase transition