Decoherence in a Two Slit Diffraction Experiment with Massive Particles

Matter-wave interferometry has been largely studied in the last few years. Usually, the main problem in the analysis of the diffraction experiments is to establish the causes for the loss of coherence observed in the interference pattern. In this work, we use different type of environmental couplings to model a two slit diffraction experiment with massive particles. For each model, we study the effects of decoherence on the interference pattern and define a visibility function that measures the loss of contrast of the interference fringes on a distant screen. Finally, we apply our results to the experimental reported data on massive particles $C_{70}$.Comment: 6 pages, 3 figure

Density dependence of nuclear symmetry energy constrained by mean-field calculations

We establish a correlation for the symmetry energy at saturation density $S_{0}$, slope parameter $L$ and curvature parameter $K_{\text{sym}}$ based on widely different mean field interactions. With the help of this correlation and available empirical and theoretical information, the density dependent behavior around the saturation density is determined. We compare the results obtained with the present approach with those by other analyses. With this obtained density dependent behavior of the symmetry energy, the neutron skin thickness of $^{208}$Pb and some properties of neutron stars are investigated. In addition, it is found that the expression $S(\rho)=S_{0}(\rho /\rho_{0})^{\gamma}$ or $S(\rho)=12.5(\rho /\rho_{0}) ^{2/3}+C_{p}(\rho /\rho_{0}) ^{\gamma}$ does not reproduce the density dependence of the symmetry energy as predicted by the mean-field approach around nuclear saturation density.Comment: 6 pages, 4 figure

Visibility Fringe Reduction Due to Noise-Induced Effects: Microscopic Approach to Interference Experiments

Decoherence is the main process behind the quantum to classical transition. It is a purely quantum mechanical effect by which the system looses its ability to exhibit coherent behavior. The recent experimental observation of diffraction and interference patterns for large molecules raises some interesting questions. In this context, we identify possible agents of decoherence to take into account when modeling these experiments and study theirs visible (or not) effects on the interference pattern. Thereby, we present an analysis of matter wave interferometry in the presence of a dynamic quantum environment and study how much the visibility fringe is reduced and in which timescale the decoherence effects destroy the interference of massive objects. Finally, we apply our results to the experimental data reported on fullerenes and cold neutrons.Comment: 14 pages, 5 figures. Version to appear in Mod. Phys.

Rethinking mobile delivery: using quick response codes to access information at point of need

ManuscriptThis paper covers the use of Quick Response (QR) Codes to provide instant mobile access to information, digital collections, educational offerings, the library website, subject guides, text messages, videos, and personnel in the library. The array of uses and the value of using QR Codes to push customized information to patrons are explained. A case is developed for using QR codes for mobile delivery of customized information to patrons. Applications in use at the Libraries of the University of Utah will be reviewed to provide readers with ideas for use in their library

Putting wikis to work in libraries

Journal ArticleWikis are part of the suite of Web 2.0 technologies enhancing collaboration and communication. This article describes the ways in which one academic health sciences library has utilized wiki software. The Eccles Health Sciences Library has found wikis to be valuable collaboration tools. Case scenarios and software selection recommendations will be outlined. Examples of collaborations using wikis include grant writing, strategic planning, departmental documentation, and committee work. Comparisons are made between externally hosted and locally hosted wiki software

Digital video: broadcasting and on-demand play back

PresentationA LIFT Forum presentation. The purpose of the Library and Information Technology Forum is to inform the University of Utah community about electronic information resources, and current trends in the use of computers and online technologies for accessing these resources

Digital and streaming video: The Eccles Library Digital Video Studio

PresentationA LIFT Forum presentation. The purpose of the Library and Information Technology Forum is to inform the University of Utah community about electronic information resources, and current trends in the use of computers and online technologies for accessing these resource