Quantum Characterization of a Werner-like Mixture

We introduce a Werner-like mixture [R. F. Werner, Phys. Rev. A {\bf 40}, 4277 (1989)] by considering two correlated but different degrees of freedom, one with discrete variables and the other with continuous variables. We evaluate the mixedness of this state, and its degree of entanglement establishing its usefulness for quantum information processing like quantum teleportation. Then, we provide its tomographic characterization. Finally, we show how such a mixture can be generated and measured in a trapped system like one electron in a Penning trap.Comment: 8 pages ReVTeX, 8 eps figure

Pervasive gaps in Amazonian ecological research

Biodiversity loss is one of the main challenges of our time, and attempts to address it require a clear understanding of how ecological communities respond to environmental change across time and space. While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes, vast areas of the tropics remain understudied. In the American tropics, Amazonia stands out as the world's most diverse rainforest and the primary source of Neotropical biodiversity, but it remains among the least known forests in America and is often underrepresented in biodiversity databases. To worsen this situation, human-induced modifications may eliminate pieces of the Amazon's biodiversity puzzle before we can use them to understand how ecological communities are responding. To increase generalization and applicability of biodiversity knowledge, it is thus crucial to reduce biases in ecological research, particularly in regions projected to face the most pronounced environmental changes. We integrate ecological community metadata of 7,694 sampling sites for multiple organism groups in a machine learning model framework to map the research probability across the Brazilian Amazonia, while identifying the region's vulnerability to environmental change. 15%–18% of the most neglected areas in ecological research are expected to experience severe climate or land use changes by 2050. This means that unless we take immediate action, we will not be able to establish their current status, much less monitor how it is changing and what is being lost

Effect of birth parameters on retinal vascular caliber: The twins eye study in Tasmania

10.1161/HYPERTENSIONAHA.108.125914Hypertension533487-493HPRT

Between Education and Propaganda: Public Controversy Over Presidential Library Design

While there is abundant scholarship on extant presidential libraries, rejected presidential library proposals are comparatively understudied. Here, we analyze the public controversies surrounding Richard Nixon's and Ronald Reagan's ill-fated plans for housing their presidential libraries at Duke and Stanford Universities, respectively. These parallel cases offer a glimpse into what Thomas Farrell terms “social knowledge in controversy” — episodes where prevailing social precedents governing human decision-making evolve in the crucible of public argument. What are the presumptions about how presidential libraries should be built and operated? How did they shape the public argument at Duke and Stanford during the early 1980s, and in turn, how did those schools' ultimate decisions to reject the Nixon and Reagan Library proposals reinforce or mold the presumptions? Through examination of primary documents housed at the Stanford and Duke University archives, we generate insight regarding the evolving political function of presidential libraries, and explore the utility of Chaïm Perelman and Lucie Olbrechts-Tyteca's theory of argumentation as a tool of rhetorical criticism. Such inquiry is especially timely in the contemporary milieu, where public controversy simmers regarding the 43rd American president's future library at Southern Methodist University, and where issues of government transparency and accountability persist as salient topics of public and scholarly concern