4,961 research outputs found
Moyal star product approach to the Bohr-Sommerfeld approximation
The Bohr-Sommerfeld approximation to the eigenvalues of a one-dimensional
quantum Hamiltonian is derived through order (i.e., including the
first correction term beyond the usual result) by means of the Moyal star
product. The Hamiltonian need only have a Weyl transform (or symbol) that is a
power series in , starting with , with a generic fixed point in
phase space. The Hamiltonian is not restricted to the kinetic-plus-potential
form. The method involves transforming the Hamiltonian to a normal form, in
which it becomes a function of the harmonic oscillator Hamiltonian.
Diagrammatic and other techniques with potential applications to other normal
form problems are presented for manipulating higher order terms in the Moyal
series.Comment: 27 pages, no figure
Integrated control of Fascioliasis in Latin America: Results of an International Atomic Energy Agency Project
Even though Fascioliasis has been known for centuries, it is now emerging in many parts of the world . Human cases are rising, two decades ago the estimates were of a few thousand , current estimates reach many millions. The human endemic areas are highest in Latin American countries and animal fascioliasis greatly affects livestock all through the region, often of poor subsistence farmers, thus decreasing even more their meager earnings and contributing to the cycle of disease and poverty . The enourmous geographical diversity of the regions affected by fascioliasis in Latin America ranges from the cold, snowcovered Patagonia to the simmering tropics of Central America
EFECTO DEL ĂCIDO CĂTRICO COMO PRETRATAMIENTO SOBRE LA ACTIVIDAD DE AGUA Y COMPORTAMIENTO DE SORCIĂN EN CALLO DE ALMEJA SECO (Nodipecten subnodosus)
En presente estudio se aplicĂł un tratamiento de inmersiĂłn en ĂĄcido cĂtrico a callo de almeja, con el objetivo de reducir el tiempo de secado de la almeja mano de leĂłn. Las muestras se sometieron a inmersiĂłn en ĂĄcido cĂtrico 0.1 M, durante cero (control), una y tres h. Se evaluĂł el efecto del pre-tratamiento de inmersiĂłn en soluciĂłn ĂĄcida y la temperatura de secado (50, 60 y 70 °C), sobre la aw y el fenĂłmeno de sorciĂłn en el callo seco. Ambas variables mostraron un efecto significativo (
Impacto de la tĂ©cnica quirĂșrgica en patient blood management
PO-067
IntroducciĂłn: La autotransfusiĂłn es un mĂ©todo de ahorro de sangre frecuentemente utilizado en procedimientos quirĂșrgicos con elevado riesgo hemorrĂĄgico. La cistectomĂa radical por neoplasia de vejiga es una intervenciĂłn quirĂșrgica agresiva, con gran morbimortalidad y altos requerimientos transfusionales. Por este motivo, la autodonaciĂłn de sangre previa a cirugĂa se sigue utilizando en estos pacientes. Sin embargo, el abordaje laparoscĂłpico parece disminuir la necesidad de transfusiĂłn y podrĂa suponer en sĂ misma una herramienta de ahorro de hemoderivados. El objetivo de este estudio es valorar la repercusiĂłn de esta novedad tĂ©cnica en la tasa de sangrados y requerimientos transfusionales en estos pacientes.
Material y mĂ©todos: Estudio observacional descriptivo y retrospectivo, realizado en el Hospital ClĂnico Lozano Blesa de Zaragoza, desde enero de 2012 a junio de 2017. Se incluyeron pacientes intervenidos de cistectomĂa radical, clasificados segĂșn en abordaje quirĂșrgico utilizado en cirugĂa abierta o laparoscĂłpica, y se compararon los dos grupos en tĂ©rminos de sangrado y requerimientos transfusionales durante la cirugĂa y tras la misma.
Resultados: Se registraron un total de 164 pacientes, 89, 6% varones y 10, 4% mujeres, con una mediana de edad de 67, 1±9, 1 años. El 35, 4% de las intervenciones quirĂșrgicas fueron realizadas por vĂa laparoscĂłpica. A pesar de que este abordaje supuso un mayor tiempo de cirugĂa, de forma estadĂsticamente significativa (p<0, 003), las tasas de sangrado durante y tras la intervenciĂłn, asĂ como el consumo de hemoderivados fueron significativamente menores (p<0, 001). ..
Sonidegib as a Locally Advanced Basal Cell Carcinoma Therapy in Real-life Clinical Setting: A National Multicentre Study
Background: Basal cell carcinoma (BCC) is the most prevalent cancer. A minority of BCCs have an aggressive behaviour (laBCC) and may require hedgehog pathway inhibitors such as sonidegib as its treatment. Objective: To describe the use of sonidegib in a large number of patients and provide more data on its real-life efficacy and safety profile.Methods: We conducted a retrospective and multicentric study that included patients treated with sonidegib. Epidemiological, effectiveness and safety data were collected.Results: A total of 82 patients with a mean age of 73.9 years were included. Ten patients had Gorlin syndrome. Median treatment duration was 6 months. Median follow-up duration was 34.2 months. Globally, 81.7% of the patients showed clinical improvement (52.4% partial response and 29.3% complete response), 12.2% clinical stability and 6.1% disease progression. There was no statistically significant difference in clinical improvement between the 24 h and 48 h sonidegib posology. After 6 months of treatment, 48.8% of the patients discontinued sonidegib. Prior vismodegib treatment and recurrent primary BCC were associated with a poorer response to sonidegib. At 6 months of treatment, 68.3% of the patients experienced at least one adverse effect. Conclusion: Sonidegib shows good effectiveness and acceptable safety profile in usual clinical practice.& COPY; 2023 AEDV. Published by Elsevier Espan & SIM;a, S.L.U.This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Observation of an Excited Bc+ State
Using pp collision data corresponding to an integrated luminosity of 8.5 fb-1 recorded by the LHCb experiment at center-of-mass energies of s=7, 8, and 13 TeV, the observation of an excited Bc+ state in the Bc+Ï+Ï- invariant-mass spectrum is reported. The observed peak has a mass of 6841.2±0.6(stat)±0.1(syst)±0.8(Bc+) MeV/c2, where the last uncertainty is due to the limited knowledge of the Bc+ mass. It is consistent with expectations of the Bcâ(2S31)+ state reconstructed without the low-energy photon from the Bcâ(1S31)+âBc+Îł decay following Bcâ(2S31)+âBcâ(1S31)+Ï+Ï-. A second state is seen with a global (local) statistical significance of 2.2Ï (3.2Ï) and a mass of 6872.1±1.3(stat)±0.1(syst)±0.8(Bc+) MeV/c2, and is consistent with the Bc(2S10)+ state. These mass measurements are the most precise to date
Differential branching fraction and angular analysis of the decay B0âKâ0ÎŒ+ÎŒâ
The angular distribution and differential branching fraction of the decay B 0â K â0 ÎŒ + ÎŒ â are studied using a data sample, collected by the LHCb experiment in pp collisions at sâ=7 TeV, corresponding to an integrated luminosity of 1.0 fbâ1. Several angular observables are measured in bins of the dimuon invariant mass squared, q 2. A first measurement of the zero-crossing point of the forward-backward asymmetry of the dimuon system is also presented. The zero-crossing point is measured to be q20=4.9±0.9GeV2/c4 , where the uncertainty is the sum of statistical and systematic uncertainties. The results are consistent with the Standard Model predictions
Measurement of the mass and lifetime of the baryon
A proton-proton collision data sample, corresponding to an integrated
luminosity of 3 fb collected by LHCb at and 8 TeV, is used
to reconstruct , decays. Using the , decay mode for calibration, the lifetime ratio and absolute
lifetime of the baryon are measured to be \begin{align*}
\frac{\tau_{\Omega_b^-}}{\tau_{\Xi_b^-}} &= 1.11\pm0.16\pm0.03, \\
\tau_{\Omega_b^-} &= 1.78\pm0.26\pm0.05\pm0.06~{\rm ps}, \end{align*} where the
uncertainties are statistical, systematic and from the calibration mode (for
only). A measurement is also made of the mass difference,
, and the corresponding mass, which
yields \begin{align*} m_{\Omega_b^-}-m_{\Xi_b^-} &= 247.4\pm3.2\pm0.5~{\rm
MeV}/c^2, \\ m_{\Omega_b^-} &= 6045.1\pm3.2\pm 0.5\pm0.6~{\rm MeV}/c^2.
\end{align*} These results are consistent with previous measurements.Comment: 11 pages, 5 figures, All figures and tables, along with any
supplementary material and additional information, are available at
https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-008.htm
Measurement of the lifetime
Using a data set corresponding to an integrated luminosity of ,
collected by the LHCb experiment in collisions at centre-of-mass energies
of 7 and 8 TeV, the effective lifetime in the
decay mode, , is measured to be ps. Assuming
conservation, corresponds to the lifetime of the light
mass eigenstate. This is the first measurement of the effective
lifetime in this decay mode.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-017.htm
Bose-Einstein correlations of same-sign charged pions in the forward region in pp collisions at âs=7 TeV
Bose-Einstein correlations of same-sign charged pions, produced in protonproton collisions at a 7 TeV centre-of-mass energy, are studied using a data sample collected
by the LHCb experiment. The signature for Bose-Einstein correlations is observed in the
form of an enhancement of pairs of like-sign charged pions with small four-momentum
difference squared. The charged-particle multiplicity dependence of the Bose-Einstein correlation parameters describing the correlation strength and the size of the emitting source
is investigated, determining both the correlation radius and the chaoticity parameter. The
measured correlation radius is found to increase as a function of increasing charged-particle
multiplicity, while the chaoticity parameter is seen to decreas
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