Complete Phase Diagrams for a Holographic Superconductor/Insulator System

The gravitational dual of an insulator/superconductor transition driven by increasing the chemical potential has recently been constructed. However, the system was studied in a probe limit and only a part of the phase diagram was obtained. We include the backreaction and construct the complete phase diagram for this system. For fixed chemical potential there are typically two phase transitions as the temperature is lowered. Surprisingly, for a certain range of parameters, the system first becomes a superconductor and then becomes an insulator as the temperature approaches zero. As a byproduct of our analysis, we also construct the gravitational dual of a Bose-Einstein condensate of glueballs in a confining gauge theory.Comment: 19 pages; v2: references adde

Practices, policies, and problems in the management of learning data: A survey of libraries’ use of digital learning objects and the data they create

This study analyzed libraries’ management of the data generated by library digital learning objects (DLO’s) such as forms, surveys, quizzes, and tutorials. A substantial proportion of respondents reported having a policy relevant to learning data, typically a campus-level policy, but most did not. Other problems included a lack of access to library learning data, concerns about student privacy, inadequate granularity or standardization, and a lack of knowledge about colleagues’ practices. We propose more dialogue on learning data within libraries, between libraries and administrators, and across the library profession

Meeting users where they are: Delivering dynamic content and services through a campus portal

Campus portals are one of the most visible and frequently used online spaces for students, offering one-stop access to key services for learning and academic self-management. This case study reports how instruction librarians at the University of Vermont collaborated with portal developers in the registrar’s office to develop high-impact, point-of-need content for a dedicated “Library” page. This content was then created in LibGuides and published using the Application Programming Interfaces (APIs) for LibGuides boxes. Initial usage data and analytics show that traffic to the libraries’ portal page has been substantially and consistently higher than expected. The next phase for the project will be the creation of customized library content that is responsive to the student’s user profile

The Breeding Biology of the Western Tanager (Piranga Ludoviciana)

In 1969 a two-year study was undertaken in an effort to enlarge our knowledge of the life history of the western tanager (Piranga ludoviciana). Bent (1958) summarizes the literature on the western tanager, and a review of his work clearly shows an almost total absence of detailed information on the species\u27 life history. To obtain this information, observations were conducted from 1 May through 29 July 1969. A few observations were made during the 1968 breeding season