867 research outputs found
Asymptotic equivalence of a subclass of WCLT non degenerate GKSL generator
We prove the assymptotic equivalence of a sequence of block diagonal matrices
with Toeplitz blocks. The blocks are the principal submatrices of an
originating Toeplitz sequence with generating symbol of the Wiener class. As an
application, using the invariance of certain \textit{diagonal} and
\textit{cyclic-diagonal} operator subspaces of the GKSL generators of circulant
and WCLT quantum Markov semigroups, the asymptotic equivalence of the families
is proved under suitable hypothesis
Assessment of the importance of the current-wave coupling in the shelf ocean forecasts
International audienceThe effects of wave-current interactions on shelf ocean forecasts is investigated in the framework of the MFSTEP (Mediterranean Forecasting System Project Towards Enviromental Predictions) project. A one way sequential coupling approach is adopted to link the wave model (WAM) to the circulation model (SYMPHONIE). The coupling of waves and currents has been done considering four main processes: wave refraction due to currents, surface wind drag and bottom drag modifications due to waves, and the wave induced mass flux. The coupled modelling system is implemented in the southern Catalan shelf (NW Mediterranean), a region with characteristics similar to most of the Mediterranean shelves. The sensitivity experiments are run in a typical operational configuration. The wave refraction by currents seems to be not very relevant in a microtidal context such as the western Mediterranean. The main effect of waves on current forecasts is through the modification of the wind drag. The Stokes drift also plays a significant role due to its spatial and temporal characteristics. Finally, the enhanced bottom friction is just noticeable in the inner shelf
Rare decay via scalar leptoquark doublets
A calculation of the one-loop contribution to the rare three-body flavor
changing neutral current top quark decay is presented in
the framework of models with one or more scalar leptoquark doublets
with hypercharge . Analytical expressions for the invariant amplitude of
the generic decay , with a lepton or quark,
are presented in terms of Passarino-Veltman integral coefficients, from which
the amplitudes for the processes and follow easily. An analysis of the current constraints on
the parameter space is presented in the scenario with only one scalar LQ
doublet and bounds on the LQ couplings are obtained from the muon
anomaly, the lepton flavor violating (LFV) decay and extra
constraints meant to avoid tension between theory predictions and experimental
data. For a LQ with a mass in the range of -- TeVs, the estimate -- is obtained for the largest
allowed values of the LQ coupling constants, which means that this decay would
be below the reach of future experimental measurements. We also consider an
scenario with three scalar doublets, which was recently proposed to explain the
lepton flavor universality violation anomalies in decays as well as the
muon anomaly. Although this scenario allows large LQ couplings to the tau
lepton and the and quarks, the branching ratio of the decay is also of the order of -- for LQ
masses of 1.7 TeV.Comment: In preparation for Journal Submissio
External quarantine of artiodactils wildlife from Namibia to Cuba
In Cuba for several years not imported wild animals from the African continent and this important
donation was received from Namibia called Noah?s Ark II, considered the largest held in the country?s
history. The present study shows the results of external quarantine of the 8 species of artiodactyls
introduced in the country and with final destination at the National Zoo Park. Artiodactyls species
were identified as African Buffalo (Syncerus caffer), Cape Eland (Taurotragus oryx), Roan Antelope
(Hippotragus equinus), Greater Kudu (Tragelaphus strepsiceros), Hartebeest (Alcelaphus lichtensteinii),
Gemsbok or Oryx (Oryx gazella), Impala (Aepyceros melampus) and Springbok (Antidorcas marsupiales).
One hundred nine animals were investigated against 20 diseases. The laboratory results showed that
74.3% of all animals in quarantine were negative for 15 of the 20 diseases, 4% trypanosomiasis
suspects and 22% positive for bluetongue, theileriosis, anaplasmosis and epizootic hemorrhagic
disease. Sex relating these results showed that the highest percentage of negative animals appeared
in populations with 77% females, while in males was lower with 69%. Arrived in the country a
total of 59 adults and 5 calf Springbok meeting with the evaluate aspects and points made in the
import protocol, so as apparently healthy animals and serologically negative to diseases of interestFil: Bolaños, R. Dirección Provincial La Habana. Instituto de Medicina Veterinaria (IMV). Departamento de Cuarentena Animal y Control de Comercio Internacional. La Habana, CubaFil: Cubilla, S. Parque Zoológico Nacional de Cuba (PZN). La Habana, CubaFil: Hernández, O.I. Dirección Provincial La Habana. Instituto de Medicina Veterinaria (IMV). Departamento de Cuarentena Animal y Control de Comercio Internacional. La Habana, CubaFil: Abeledo, M.A. Centro Nacional de Sanidad Agropecuaria (CENSA). CubaEn Cuba desde hace varios años no se importaban animales salvajes desde el continente africano y
esta importante donación recibida desde Namibia ha sido denominada Arca de Noé II, considerada
la mayor realizada en la historia del paÃs. El presente estudio muestra los resultados obtenidos en
la cuarentena externa de las 8 especies de artiodáctilos introducidas en el territorio nacional y con
destino final al Parque Zoológico Nacional. Las especies de artiodáctilos fueron identificadas como
Búfalo Africano (Syncerus caffer), Eland del Cabo (Taurotragus oryx), AntÃlope Roan (Hippotragus
equinus), Gran Kudu (Tragelaphus strepsiceros), Hartebeest (Alcelaphus lichtensteinii), Gemsbok o Oryx
(Oryx gazella), Impala (Aepyceros melampus) y Springbok (Antidorcas marsupiales). Se investigaron
109 animales contra 20 enfermedades. Los resultados de laboratorio arrojaron que el 74.3% del total
de los animales en cuarentena fueron negativos a 15 de las 20 enfermedades, el 4% sospechosos a
tripanosomiasis y el 22% positivos a lengua azul, teileriosis, anaplasmosis y enfermedad hemorrágica
epizoótica. Al relacionar el sexo en estos resultados observamos que el mayor por ciento de animales
negativos se presentó en las poblaciones de hembras con un 77%, mientras que en los machos fue
inferior con 69%. Arribaron al paÃs un total de 59 artiodáctilos adultos y 5 crÃas de Springbok
cumpliendo con los aspectos evaluados y puntos establecidos en el protocolo de importación, asÃ
como animales aparentemente sanos y serológicamente negativos a las enfermedades de interés
Effects of supplementation of L-carnitine on the body composition of trained and sedentary rats
El objetivo del presente estudio es determinar el efecto de la suplementación de L-carnitina sobre la composición corporal de ratas entrenadas y sedentarias. Fueron seleccionadas de forma aleatoria 30 ratas machos Wistar, de 12 semanas de vida, cuyo peso osciló entre 350 a 380 gramos, constituyéndose cuatro grupos de animales: sedentario no suplementado (SNS), sedentario suplementado (SS), entrenado no suplementado (ENS) y entrenado suplementado (ES). El entrenamiento fue realizado con sesiones de carrera en la estera rodante, con duración de una hora y con suplementación oral crónica de L-Carnitina. Ambos protocolos con una duración de 4 semanas. La composición corporal fue evaluada a través de ecuaciones de predicción para determinar la masa libre de grasa (MLG) y masa de grasa (MG). Los resultados muestran que el entrenamiento fÃsico disminuye los valores de la MLG y MG en el grupo ENS, y que la administración de la L-carnitina en forma conjunta con el entrenamiento fÃsico revierte parcialmente la reducción de la MLG en el grupo ES. Finalmente se concluye que el ejercicio fÃsico debe ser realizado juntamente con la suplementación de L-carnitina, permitiendo una disminución de la MG y mantener los niveles de MLG en ratas en proceso de crecimiento.The aim of this study is to determine the effect of L-carnitine supplementation on body composition of trained and sedentary rats. Were randomly selected 30 male Wistar rats of 12 weeks of age, whose weight ranged between 350 to 380 grams, four groups of animals: sedentary non-supplemented (SNS), sedentary supplemented (SS), trained not supplemented (ENS) trained and supplemented (ES). The training was done with sessions running on a treadmill, lasting an hour and chronic oral supplementation of L-carnitine. Both protocols with a duration of 4 weeks. Body composition was assessed by prediction equations to determine fat-free (FFM) and fat mass (FM). The results show that physical training decreases the values of FFM and FM in the ENS group, and that the administration of L-carnitine together with physical training partially reverses the reduction of MLG in ES. Finally concluded that physical exercise should be conducted jointly with the supplementation of L-carnitine, allowing a reduction in the MG and maintain levels in rats MLG growth process.Peer Reviewe
A Characterization of Quantum Gaussian States in Terms of Annihilation Moments
We give a rigorous definition of moments of an unbounded observable with
respect to a quantum state in terms of Yosida's approximations of unbounded
generators of contractions semigroups. We use this notion to characterize
Gaussian states in terms of annihilation moments. As a by-product, rigorous
formulae for the mean value vector and the covariance matrix of a Gaussian
state are obtained
The fast recurrent subspace on an -level quantum energy transport model
The fast recurrent subspace (the biggest support of all invariant states) of
a Weak Coupling Limit Type Quantum Markov Semigroup modeling a quantum
transport open system of -energy levels is determined. This is achieved by
characterizing the structure of all the invariant state and their spectra in
terms of a natural generalization of the Discrete Fourier Transform operator.
Finally, the attraction domains and long-time behavior of the evolution are
studied on hereditary subalgebras where faithful invariant states exist.Comment: 25 page
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