2,774 research outputs found
Analyses of pion-nucleon elastic scattering amplitudes up to in extended-on-mass-shell subtraction scheme
We extend the analysis of elastic pion-nucleon scattering up to
level using extended-on-mass-shell subtraction scheme within the framework of
covariant baryon chiral perturbation theory. Numerical fits to partial wave
phase shift data up to GeV are performed to pin down the free
low energy constants. A good description to the existing phase shift data is
achieved. We find a good convergence for the chiral series at ,
considerably improved with respect to the -level analyses found in
previous literature. Also, the leading order contribution from explicit
resonance and partially-included loop
contribution are included to describe phase shift data up to
GeV. As phenomenological applications, we investigate chiral correction to the
Goldberger-Treiman relation % and find that it converges rapidly,
and the correction is found to be very small: . We also
get a reasonable prediction of pion-nucleon sigma term up to
by performing fits including both the pion-nucleon partial wave phase
shift data and the lattice QCD data. We report that MeV
from the fit without , and MeV from the
fit with explicit .Comment: The final version published in Phys.Rev. D 87, 054019 (2013
Measuring the X-ray luminosities of DESI groups from eROSITA Final Equatorial-Depth Survey: I. X-ray luminosity - halo mass scaling relation
We use the eROSITA Final Equatorial-Depth Survey (eFEDS) to measure the
rest-frame 0.1-2.4 keV band X-ray luminosities of 600,000 DESI groups
using two different algorithms in the overlap region of the two observations.
These groups span a large redshift range of and group
mass range of .
(1) Using the blind detection pipeline of eFEDS, we find that 10932 X-ray
emission peaks can be cross matched with our groups, of which have
signal-to-noise ratio in X-ray detection. Comparing to
the numbers reported in previous studies, this matched sample size is a factor
of larger. (2) By stacking X-ray maps around groups with similar
masses and redshifts, we measure the average X-ray luminosity of groups as a
function of halo mass in five redshift bins. We find, in a wide halo mass
range, the X-ray luminosity, , is roughly linearly proportional to
, and is quite independent to the redshift of the groups. (3) We use a
Poisson distribution to model the X-ray luminosities obtained using two
different algorithms and obtain best-fit and scaling relations, respectively. The best-fit
slopes are flatter than the results previously obtained, but closer to a
self-similar prediction.Comment: 15 pages, 13 figures, accepted for publication in MNRA
Clinical application of the paraspinal erector approach for spinal canal decompression in upper lumber burst fractures
OBJECTIVE: Percutaneous pedicle screw fixation is commonly used for upper lumber burst fractures. The direct decompression remains challenging with this minimally invasive surgery. The objective was to evaluate a novel paraspinal erector approach for effective and direct decompression in patients with canal compromise and neurologic deficit. METHOD: Patients (n = 21) with neurological deficiency and Denis B type upper lumbar burst fracture were enrolled in the study, including 14 cases in the L1 and 7 cases in the L2. The patients underwent removal of bone fragments from the spinal canal through intervertebral foramen followed by short-segment fixation. Evaluations included surgery-related, such as duration of surgery and blood loss, and 12-month follow-up, such as the kyphotic angle, the height ratio of the anterior edge of the vertebra, the ratio of sagittal canal compromise, visual analog scale (VAS), Oswestry Disability Index (ODI), and Frankel scores. RESULTS: All patients achieved direct spinal canal decompression using the paraspinal erector approach followed by percutaneous pedicle screw fixation. The mean operation time (SD) was 173 (23) min, and the mean (SD) blood loss was 301 (104) ml. Significant improvement was noted in the kyphotic angle, 26.2 ± 8.7 prior to operation versus 9.1 ± 4.7 at 12 months after operation (p <0.05); the height ratio of the anterior edge of the injured vertebra, 60 ± 16% versus 84 ± 9% (p <0.05); and the ratio of sagittal canal compromise, 46.5 ± 11.4% versus 4.3 ± 3.6% (p <0.05). Significant improvements in VAS (7.3 ± 1.2 vs. 1.9 ± 0.7, p <0.05), ODI (86.7 ± 5.8 vs. 16.7 ± 5.1, p <0.05), and Frankel scores were also noted. CONCLUSIONS: The paraspinal erector approach was effective for direct spinal canal decompression with minimal injury in the paraspinal muscles or spine. Significant improvements in spinal function and prognostics were achieved after the percutaneous pedicle screw fixation
Investigating high energy proton proton collisions with a multi-phase transport model approach based on PYTHIA8 initial conditions
The striking resemblance of high multiplicity proton-proton (pp) collisions
at the LHC to heavy ion collisions challenges our conventional wisdom on the
formation of the Quark-Gluon Plasma (QGP). A consistent explanation of the
collectivity phenomena in pp will help us to understand the mechanism that
leads to the QGP-like signals in small systems. In this study, we introduce a
transport model approach connecting the initial conditions provided by PYTHIA8
with subsequent AMPT rescatterings to study the collective behavior in high
energy pp collisions. The multiplicity dependence of light hadron productions
from this model is in reasonable agreement with the pp TeV
experimental data. It is found in the comparisons that both the partonic and
hadronic final state interactions are important for the generation of the
radial flow feature of the pp transverse momentum spectra. The study also shows
that the long range two particle azimuthal correlation in high multiplicity pp
events is sensitive to the proton sub-nucleon spatial fluctuations
Retrospective analysis for thirty-nine patients with solitary fibrous tumor of pleura and review of the literature
<p>Abstract</p> <p>Background</p> <p>Solitary fibrous tumor of the pleura (SFTP) is an uncommon neoplasm arising from mesenchymal cells. The aim of this study is to summarize the experience and the outcome of the surgical treatment for 39 cases of SFTP.</p> <p>Methods</p> <p>From January 2004 to December 2008, 39 patients underwent surgical resection of SFTP in our department. All patients had clinical follow-up by the same team of surgeons. The mean follow-up was 40.3 months.</p> <p>Results</p> <p>A local removal of the neoplasm was accomplished by video-assisted thoracic surgery (VATS) in 9 patients (group A) and by thoracotomy in 30 patients (group B) respectively. Comparing with group B, operations in group A took significantly less operative time, blood loss and spent less time in the intensive care unit and hospital. All specimens were positive for CD34 and Bcl-2. One patient developed recurrence, and the remaining 38 patients are alive and disease free at the end of follow-up.</p> <p>Conclusions</p> <p>Malignant SFTP still had the potential recurrence. VATS represents the more acceptable choice for the selected patients with SFTP.</p
Bis(2,9-dimethyl-1,10-phenanthroline-κ2 N,N′)(10,11,12,13-tetrahydrodipyrido[3,2-a:2′,3′-c]phenazine-κ2 N 4,N 5)ruthenium(II) bis(perchlorate) dihydrate
The title compound, [Ru(C14H12N2)2(C18H14N4)](ClO4)2·2H2O, consists of an RuII complex cation, two perchlorate anions and two uncoordinated water molecules. The RuII ion is chelated by a 10,11,12,13-tetrahydrodipyrido[3,2-a:2′,3′-c]phenazine ligand and two 2,9-dimethyl-1,10-phenanthroline ligands in a distorted octahedral geometry. The two uncoordinated water molecules are disordered over five positions, with an occupancy factor of about 0.4 for each site. A supramolecular structure is formed by weak π–π interactions between neighbouring molecules, with centroid–centroid distances of 3.618 (2) and 3.749 (2) Å
Stark tuning of telecom single-photon emitters based on a single Er
The implementation of scalable quantum networks requires photons at the
telecom band and long-lived spin coherence. The single Er in solid-state
hosts is an important candidate that fulfills these critical requirements
simultaneously. However, to entangle distant Er ions through photonic
connections, the emission frequency of individual Er in solid-state
matrix must be the same, which is challenging because the emission frequency of
Er depends on its local environment. In this study, we propose and
experimentally demonstrate the Stark tuning of the emission frequency of a
single Er in a YSiO crystal by employing electrodes interfaced
with a silicon photonic crystal cavity. We obtain a Stark shift of 182.9
0.8 MHz which is approximately 27 times of the optical emission linewidth,
demonstrating the promising applications in tuning the emission frequency of
independent Er into the same spectral channels. Our results provide a
useful solution for the construction of scalable quantum networks based on
single Er and a universal tool for tuning the emission of individual
rare-earth ions
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