631 research outputs found
Service quality and customer satisfaction: The moderating effects of hotel star rating
This research contributes to customer satisfaction knowledge with regard to accommodation in South Africa whose star grading differs. A multi-group analysis and an importance-performance map analysis by means of PLS-SEM allow us to differentiate between service quality performance scores and their influences on customer satisfaction across accommodation with a different star grading. The two most important predictors of satisfaction with one-star and two-star category accommodation are the accommodation infrastructure and the employee expertise. Both predictors were found to have relatively low levels of performance. Safety and security and room quality are two significant determinants of satisfaction with three-star establishments, although they under-perform with regard to safety and security. In respect of four-star and five-star accommodation, waiting time and customer interaction, both of which have an above average performance scores, influence customer satisfaction. We provide specific guidelines for managerial interventions to improve service quality and guests’ satisfaction for each grading category
The Dento-Gingival Junction as Seen with Light Microscopy and Scanning Electron Microscopy
The purpose of this paper is to review the anatomical relationship of the Dento-Gingival Junction as seen in the human dentition. The junction is described under light microscopy and then reviewed as seen in the SEM with the authors\u27 unpublished findings. The authors\u27 material was derived from extracted human teeth with remaining marginal gingival tissue. The specimens were fixed with 2% glutaraldehyde in O.15M sodium cacodylate buffer (pH 7.2) for 24 h. The specimens were then washed and freeze-fractured in Freon 113 using liquid nitrogen. Afterwards they were processed by freeze-drying or CPD methods, coated with gold, and placed in the scanning electron microscope (SEM) for viewing. These specimens demonstrated the presence of numerous Sharpey\u27s fibers at the cemental surface. A large number of fibrils intermingled with the fibers to produce a dense mass of tissue. Junctional epithelium, with the adjacent homogeneous dental cuticle was demonstrated. Plaque deposits on the tooth surface extended to a cell-free zone. Morphological detail viewed with SEM and light microscopy are compared
Highly charged ions in Penning traps, a new tool for resolving low lying isomeric states
The use of highly charged ions increases the precision and resolving power,
in particular for short-lived species produced at on-line radio-isotope beam
facilities, achievable with Penning trap mass spectrometers. This increase in
resolving power provides a new and unique access to resolving low-lying
long-lived ( ms) nuclear isomers. Recently, the keV
(determined from -ray spectroscopy) isomeric state in Rb has
been resolved from the ground state, in a charge state of with the TITAN
Penning trap at the TRIUMF-ISAC facility. The excitation energy of the isomer
was measured to be keV above the ground state. The extracted
masses for both the ground and isomeric states, and their difference, agree
with the AME2003 and Nuclear Data Sheet values. This proof of principle
measurement demonstrates the feasibility of using Penning trap mass
spectrometers coupled to charge breeders to study nuclear isomers and opens a
new route for isomer searches.Comment: 8 pages, 6 figure
First direct mass-measurement of the two-neutron halo nucleus 6He and improved mass for the four-neutron halo 8He
The first direct mass-measurement of He has been performed with the
TITAN Penning trap mass spectrometer at the ISAC facility. In addition, the
mass of He was determined with improved precision over our previous
measurement. The obtained masses are (He) = 6.018 885 883(57) u and
(He) = 8.033 934 44(11) u. The He value shows a deviation from
the literature of 4. With these new mass values and the previously
measured atomic isotope shifts we obtain charge radii of 2.060(8) fm and
1.959(16) fm for He and He respectively. We present a detailed
comparison to nuclear theory for He, including new hyperspherical harmonics
results. A correlation plot of the point-proton radius with the two-neutron
separation energy demonstrates clearly the importance of three-nucleon forces.Comment: 4 pages, 2 figure
Trapped-ion decay spectroscopy towards the determination of ground-state components of double-beta decay matrix elements
A new technique has been developed at TRIUMF's TITAN facility to perform
in-trap decay spectroscopy. The aim of this technique is to eventually measure
weak electron capture branching ratios (ECBRs) and by this to consequently
determine GT matrix elements of decaying nuclei. These branching
ratios provide important input to the theoretical description of these decays.
The feasibility and power of the technique is demonstrated by measuring the
ECBR of Cs.Comment: 9 pages, 9 figure
First Penning-trap mass measurement in the millisecond half-life range: the exotic halo nucleus 11Li
In this letter, we report a new mass for Li using the trapping
experiment TITAN at TRIUMF's ISAC facility. This is by far the shortest-lived
nuclide, , for which a mass measurement has ever been
performed with a Penning trap. Combined with our mass measurements of
Li we derive a new two-neutron separation energy of 369.15(65) keV: a
factor of seven more precise than the best previous value. This new value is a
critical ingredient for the determination of the halo charge radius from
isotope-shift measurements. We also report results from state-of-the-art
atomic-physics calculations using the new mass and extract a new charge radius
for Li. This result is a remarkable confluence of nuclear and atomic
physics.Comment: Formatted for submission to PR
Elucidation of the anomalous A = 9 isospin quartet behaviour
Recent high-precision mass measurements of Li and Be, performed
with the TITAN Penning trap at the TRIUMF ISAC facility, are analyzed in light
of state-of-the-art shell model calculations. We find an explanation for the
anomalous Isobaric Mass Multiplet Equation (IMME) behaviour for the two = 9
quartets. The presence of a cubic = 6.3(17) keV term for the =
3/2 quartet and the vanishing cubic term for the excited =
1/2 multiplet depend upon the presence of a nearby = 1/2 state in
B and Be that induces isospin mixing. This is contrary to previous
hypotheses involving purely Coulomb and charge-dependent effects. = 1/2
states have been observed near the calculated energy, above the = 3/2
state. However an experimental confirmation of their is needed.Comment: 5 pages, 2 figure
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