730 research outputs found
Neutrino energy reconstruction from one muon and one proton events
We propose a new method of selection of high purity charge current
quasielastic neutrino events with a good reconstruction of interacting neutrino
energy. Performance of the method was verified with several tests using GENIE,
NEUT and NuWro Monte Carlo events generators with carbon and argon targets. The
method can be useful in neutrino oscillation studies with a few GeV energy
beams.Comment: 8 pages, 5 figure
Matrix exponential via Clifford algebras
We use isomorphism between matrix algebras and simple orthogonal
Clifford algebras \cl(Q) to compute matrix exponential of a real,
complex, and quaternionic matrix A. The isomorphic image in
\cl(Q), where the quadratic form has a suitable signature is
exponentiated modulo a minimal polynomial of using Clifford exponential.
Elements of \cl(Q) are treated as symbolic multivariate polynomials in
Grassmann monomials. Computations in \cl(Q) are performed with a Maple
package `CLIFFORD'. Three examples of matrix exponentiation are given
Kappa-contraction from to
We present contraction prescription of the quantum groups: from to
. Our strategy is different then one chosen in ref. [P. Zaugg,
J. Phys. A {\bf 28} (1995) 2589]. We provide explicite prescription for
contraction of and generators of and arrive at
Hopf algebra .Comment: 3 pages, plain TEX, harvmac, to be published in the Proceedings of
the 4-th Colloqium Quantum Groups and Integrable Systems, Prague, June 1995,
Czech. J. Phys. {\bf 46} 265 (1996
Spectral functions for medium-sized nuclei
The spectral functions for calcium and argon are constructed. It is verified
that their predictions for the quasielastic electron-nucleus cross sections in
the energy range ~1 GeV agree with the data. The argon spectral function is
then used to obtain the quasielastic neutrino-nucleus cross section.Comment: 3 pages, 3 figures, presented at 5th International Workshop on
Neutrino-Nucleus Interactions in the Few-GeV Region (NuInt07), Fermilab, USA,
30.05-3.06.200
Factors influencing transfusion-associated HLA sensitization in patients bridged to heart transplantation using ventricular assist device.
BackgroundBridging heart failure patients with mechanical ventricular assist devices (VAD) enables access to transplantation. However, VAD is associated with increased risk for anti-HLA antibodies associated with rejection of subsequent allografts. Factors determining alloantibody formation in these patients remain undefined.MethodsWe performed a single-center retrospective cohort study of 164 patients undergoing heart transplantation from 2014 to 2017. Medical records including use of VAD, transfused blood products, anti-HLA antibody testing, crossmatch, and time to transplant were evaluated.ResultsPatients received an average of 13.8 red blood cell and 1.9 single-donor platelet units associated with VAD. There was a 28.7% increase in the incidence of anti-HLA antibodies after VAD. Development of anti-HLA antibodies did not correlate with volume or type of blood products, but with pre-VAD HLA sensitization status; relative risk of new alloantibodies in patients with pre-VAD antibodies was 3.5-fold higher than those without prior antibodies (PÂ =Â .008). Development of new anti-HLA antibodies was associated with an increased time to transplant (169 vs 330Â days, PÂ =Â .013).ConclusionsOur findings indicate that the presence of anti-HLA antibodies pre-VAD was the most significant risk factor for developing additional antibodies post-VAD, suggesting that a subset of patients may be predisposed to alloantibody formation
axial form factor from bubble chamber experiments
A careful reanalysis of both Argonne National Laboratory and Brookhaven
National Laboratory data for weak single pion production is done. We consider
deuteron nuclear effects and normalization (flux) uncertainties in both
experiments. We demonstrate that these two sets of data are in good agreement.
For the dipole parametrization of , we obtain , GeV. As an application we present the discussion of
the uncertainty of the neutral current 1 production cross section,
important for the T2K neutrino oscillation experiment.Comment: 16 pages, 8 figures, 2 table
The analysis of renal artery cross-section area and kidney volume in computed tomography angiography
Background: The purpose of this study was to assess the relationship between renal artery cross-section area and kidney volume with consideration of anatomical variants of renal arteries, sexual dimorphism and lateralisation. Materials and methods: Two hundred and two patients, 104 women and 98 men, aged 57.3 ± 16 years were examined using computed tomography angiography (CTA) of abdominal aorta for various reasons. The cross-section areas of renal arteries were measured automatically with a vessel tracking programme and summed up on each side in case of the presence of additional renal arteries. The kidneys were measured manually. Results: Additional renal arteries (ARA) were found in 68 (33.7%) patients. Fifty-three (77.9%) of them had one, 11 (16.2%) two and 4 (5.9%) three ARAs. Bilateral ARAs occurred in 10 cases (14.7% patients with ARA). Proximal branching of renal artery occurred in 36 (8.4%) renal arteries. The cross-section area of the largest renal artery depended on the number of ipsilateral renal arteries. Mean cross-section area of the main left renal artery was larger than on the right side (28.52 mm2 vs. 25.36 mm2, p < 0.01) in the whole analysed group. Strong sexual dimorphism in renal artery cross-section area was observed (p < 0.01) in favour of men (31.3 mm2 in men and 22.9 mm2 in women). Mean total renal artery cross-section area has positively correlated with kidney volume (p < 10–13) in both sexes with Pearson correlation value of 0.5. Conclusions: The cross-section area of renal arteries correlated positively with kidney volume in both sexes. Presence of ARAs does not influence the sum of cross-section areas of renal arteries. In case of a difference between left and right renal artery cross-section area with symmetrical kidneys, it is necessary to look for ARA
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