University of Arkansas

About: University of Arkansas is a education organization based out in Fayetteville, Arkansas, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 17225 authors who have published 33329 publications receiving 941102 citations. The organization is also known as: Arkansas & UA.

Physics of ultrathin films and heterostructures of rare earth nickelates

Abstract: The electronic structure of transition metal oxides featuring correlated electrons can be rationalized within the Zaanen-Sawatzky-Allen framework. Following a brief description of the present paradigms of electronic behavior, we focus on the physics of rare earth nickelates as an archetype of complexity emerging within the charge transfer regime. The intriguing prospect of realizing the physics of high $T_c$ cuprates through heterostructuring resulted in a massive endeavor to epitaxially stabilize these materials in ultra-thin form. A plethora of new phenomena unfolded in such artificial structures due to the effect of epitaxial strain, quantum confinement, and interfacial charge transfer. Here we review the present status of artificial rare-earth nickelates in an effort to uncover the interconnection between the electronic and magnetic behavior and the underlying crystal structure. We conclude by discussing future directions to disentangle the puzzle regarding the origin of the metal-insulator transition, the role of oxygen holes, and the true nature of the antiferromagnetic spin configuration in the ultra-thin limit.

Seeking historical examples to illustrate key aspects of the nature of science

Abstract: Increasingly widespread agreement exists that the nature of science (NOS) must be an integral element of the K-12 science curriculum with emerging consensus on what specific NOS elements should be the focus of such instruction. In this study reported, eight recent trade books written by NOS experts addressing the nature of science for the general public were examined to locate the historical examples included. These historical vignettes were extracted and analyzed to determine the kinds of examples used and the focus of the science discipline from which the example comes. The analysis has revealed that these authors have collectively provided approximately 80 historical vignettes in fields ranging from astronomy to physics, with some cited repeatedly from one book to another. In addition, the entire set of examples was then linked to important NOS notions providing an instructional resource for use by teachers, textbook writers and curriculum developers.

Conjugation Chemistry and Bioapplications of Semiconductor Box Nanocrystals Prepared via Dendrimer Bridging

Abstract: A new strategy, dendrimer bridging, is developed for simultaneous formation and functionalization of biocompatible and bioaccessible semiconductor box nanocrystalsa dendron box around each colloidal semiconductor nanocrystal. CdSe plain core or CdSe/CdS core/shell nanocrystals coated by a monolayer of organic dendron ligands (dendron nanocrystals) with hydroxyl groups as the terminal were chosen as the starting systems because of their potential biocompatibility and proven stability. A generation-two (G2) amine-terminated dendrimer was used as the cross-linking and functionalization reagent, which yielded much more stable cross-linked nanocrystals than the simple diamine or trisamine cross-linking reagents did. The chemical, thermal, and photochemical stability of the resulting amine-terminating box nanocrystals (amine box nanocrystals) formed by dendrimer bridging are comparable to that of the first generation box nanocrystals, achieved by ring-closing metathesis (RCM), that are not biocompatible and nee...

Wide Bandgap Technologies and Their Implications on Miniaturizing Power Electronic Systems

Abstract: The current state of wide bandgap device technology is reviewed and its impact on power electronic system miniaturization for a wide variety of voltage levels is described. A synopsis of recent complementary technological developments in passives, integrated driver, and protection circuitry and electronic packaging are described, followed by an outline of the applications that stand to be impacted. A glimpse into the future based on the current technological trends is offered.