17,573 research outputs found
Business Students Perception Of University Library Service Quality And Satisfaction
The main purpose of this study is to examine the college students perception of library services, and to what extent the quality of library services influences students satisfaction. The findings depict the relationship between academic libraries and their users in todays digital world and identify critical factors that may sustain a viable library-user relationship on campus
Crystal orientation and thickness dependence of superconductivity on tetragonal FeSe1-x thin films
Superconductivity was recently found in the simple tetragonal FeSe structure.
Recent studies suggest that FeSe is unconventional, with the symmetry of the
superconducting pairing state still under debate. To tackle these problems,
clean single crystals and thin films are required. Here we report the
fabrication of superconducting beta-phase FeSe1-x thin films on different
substrates using a pulsed laser deposition (PLD) technique. Quite
interestingly, the crystal orientation, and thus, superconductivity in these
thin films is sensitive to the growth temperature. At 320C, films grow
preferably along c-axis, but the onset of superconductivity depends on film
thickness. At 500C, films grow along (101), with little thickness dependence.
These results suggest that the low temperature structural deformation
previously found is crucial to the superconductivity of this material
In vivo detection of cortical optical changes associated with seizure activity with optical coherence tomography.
The most common technology for seizure detection is with electroencephalography (EEG), which has low spatial resolution and minimal depth discrimination. Optical techniques using near-infrared (NIR) light have been used to improve upon EEG technology and previous research has suggested that optical changes, specifically changes in near-infrared optical scattering, may precede EEG seizure onset in in vivo models. Optical coherence tomography (OCT) is a high resolution, minimally invasive imaging technique, which can produce depth resolved cross-sectional images. In this study, OCT was used to detect changes in optical properties of cortical tissue in vivo in mice before and during the induction of generalized seizure activity. We demonstrated that a significant decrease (P < 0.001) in backscattered intensity during seizure progression can be detected before the onset of observable manifestations of generalized (stage-5) seizures. These results indicate the feasibility of minimally-invasive optical detection of seizures with OCT
Ground and excited states of Li, Be through a density-based approach
Density functional calculations are performed for ground [He]2s
S, and three metastable bound excited states, 1s2s2p P,
1s2p S, 1s2s2p3p P of Li and [He]2s2p P,
[He]2p S, 1s2s2p S of Be each. The
work-function-based exchange potential is used, while the correlation effects
are included by employing the Lee-Yang-Parr potential. The relevant
nonrelativistic KS equation is solved by means of a generalized pseudospectral
discretization scheme offering nonuniform and optimal spatial grid. Computed
total energies, radial densities, selected density moments, as well as two
transition wavelengths (1s2s2p P1s2p S of Li,
[He]2s2p P [He]2p S of Be) show reasonably good
agreement with the available theoretical and experimental data. The term
energies show an absolute deviation of 0.007--0.171% with the largest deviation
being observed for the even-parity P state of Li. The transition
wavelengths of Li, Be are calculated within 0.891 and 0.438% of the
experimental values. This offers a simple practical route towards accurate
reliable calculation of excited states of anions within density functional
theory.Comment: 12 pages, 35 ref
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