23,415 research outputs found
Branching Ratios for the Decay of
Based on measurements the branching ratios for the decay of the recently
discovered dibaryon resonance into two-pion production channels and
into the channel are evaluated. Possibilities for a decay into the
isoscalar single-pion channel are discussed. Finally also the electromagnetic
decay of is considered
Examination of the Nature of the ABC Effect
Recently it has been shown by exclusive and kinematically complete
experiments that the appearance of a narrow resonance structure in
double-pionic fusion reactions is strictly correlated with the appearance of
the so-called ABC effect, which denotes a pronounced low-mass enhancement in
the -invariant mass spectrum. Whereas the resonance structure got its
explanation by the dibaryonic resonance, a satisfactory explanation
for the ABC effect is still pending. In this paper we discuss possible
explanations of the ABC effect and their consequences for the internal
structure of the dibaryon
To Repair or Replace: That Is The Restorative Question
Objective/Aims: During dental visits, patients spend the majority of their time with their dental hygienist. At these recall appointments the patient’s face-to-face time with the dentist may be short. At this part of the appointment the dentist may diagnose the need for restorative treatment for the patient. Part of the hygienist’s responsibility is to explain treatment options for teeth with restorative needs. The purpose of this review of literature is to provide both options for restoration of dentition to a functional/aesthetic state.
Methods: Studies pertaining to the topic were searched using PubMed database. Keywords used in the search were amalgam, composite, restoration, replace, repair, and contraindications.
Results: Of the references received multiple outcomes has been recorded. Research shows that when it comes to composite restorations generally doctors will replace them in order to get an accurate color shade to match the patient’s teeth. In regards to posterior teeth there are multiple risk factors for repairing amalgam such as endodontic involvement and denture care.
Conclusion: Due to the positive results of both repairing and replacing restorations, it ultimately comes down to a patient to patient basis. Practitioners must also take into consideration risk factors that the patient may present with, cost association/coverage, and patient preference. It is responsibility of the dental hygienist to inform patients of these variables regarding their restorative treatments so they may make an informed decision.https://scholarscompass.vcu.edu/denh_student/1010/thumbnail.jp
Novel Six-Quark Hidden-Color Dibaryon States in QCD
The recent observation of a hadronic resonance in the proton-neutron
system with isospin and spin-parity raises the possibility
of producing other novel six-quark dibaryon configurations allowed by QCD. A
dramatic example of an exotic six-quark color-singlet system is the charge
, isospin I=3, state which couples strongly to
+ The width and decay properties of such
six-quark resonances could be regarded as manifestations of "hidden-color"
six-quark configurations, a first-principle prediction of QCD -- SU(3)-color
gauge theory for the deuteron distribution amplitude. Other implications and
possible future experiments are discussed
Limit Theorems For Quantum Walks Associated with Hadamard Matrices
We study a one-parameter family of discrete-time quantum walk models on the
line and in the xy-plane associated with the Hadamard walk. Weak convergence in
the long-time limit of all moments of the walker's pseudo-velocity on the line
and in the xy-plane is proved. Symmetrization on the line and in the xy-plane
is theoretically investigated, leading to the resolution of the
Konno-Namiki-Soshi conjecture in the special case of symmetrization of the
unbiased Hadamard walk on the line . A necessary condition for the existence of
a phenomenon known as localization is given
Acoustic oscillations of rapidly rotating polytropic stars. II. Effects of the Coriolis and centrifugal accelerations
Context: With the launch of space missions devoted to asteroseismology (like
COROT), the scientific community will soon have accurate measurements of
pulsation frequencies in many rapidly rotating stars.
Aims: The present work focuses on the effects of rotation on pulsations of
rapidly rotating stars when both the Coriolis and centrifugal accelerations
require a non-perturbative treatment.
Method: We develop a 2-dimensional spectral numerical approach which allows
us to compute acoustic modes in centrifugally distorted polytropes including
the full influence of the Coriolis force. This method is validated through
comparisons with previous studies, and the results are shown to be highly
accurate.
Results: In the frequency range considered and with COROT's accuracy, we
establish a domain of validity for perturbative methods, thus showing the need
for complete calculations beyond v.sin i = 50 km/s for a R = 2.3 R_\odot, M =
1.9 M_\odot polytropic star. Furthermore, it is shown that the main differences
between complete and perturbative calculations come essentially from the
centrifugal distortion.Comment: published in A&A, corrected minor mistakes and updated some
reference
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