65,997 research outputs found
Baryon fields with U-L(3) x U-R(3) chiral symmetry. III. Interactions with chiral [(3, (3)over-bar) circle plus ((3)over-bar, 3)] spinless mesons
No full textThree-quark nucleon interpolating fields in QCD have well-defined SUL(3) x SUR(3) and U-A(1) chiral transformation properties, viz. left perpendicular(6, 3) circle plus (3, 6)right perpendicular, left perpendicular(3, (3) over bar) circle plus ((3) over bar, 3)right perpendicular, left perpendicular(8, 1) circle plus (1, 8)right perpendicular, and their mirror images; see [H. X. Chen, V. Dmitrasinovic, A. Hosaka, K. Nagata, and S. L. Zhu, Phys. Rev. D 78, 054021 (2008)]. It has been shown (phenomenologically) in [H. X. Chen, V. Dmitrasinovic, and A. Hosaka, Phys. Rev. D 81, 054002 (2010)] that mixing of the left perpendicular(6, 3) circle plus (3, 6)right perpendicular chiral multiplet with one ordinary (naive) and one mirror field belonging to the [(3, (3) over bar) circle plus ((3) over bar, 3)], [(8, 1) circle plus (1, 8)] multiplets can be used to fit the values of the isovector (g(A)((3))) and the flavor-singlet (isoscalar) axial coupling (g(A)((0))) of the nucleon and then predict the axial F and D coefficients, or vice versa, in reasonable agreement with experiment. In an attempt to derive such mixing from an effective Lagrangian, we construct all SUL(3) x SUR(3) chirally invariant non-derivative one-meson-baryon interactions and then calculate the mixing angles in terms of baryons' masses. It turns out that there are (strong) selection rules: for example, there is only one nonderivative chirally symmetric interaction between J = 1/2 fields belonging to the [(6, 3) circle plus (3, 6)] and the [(3, (3) over bar) circle plus ((3) over bar, 3)] chiral multiplets, that is also U-A(1) symmetric. We also study the chiral interactions of the [(3, (3) over bar) circle plus ((3) over bar, 3)] and [(8, 1) circle plus (1, 8)] nucleon fields. Again, there are selection rules that allow only one off-diagonal nonderivative chiral SUL(3) x SUR(3) interaction of this type, that also explicitly breaks the U-A(1) symmetry. We use this interaction to calculate the corresponding mixing angles in terms of baryon masses and fit two lowest-lying observed nucleon (resonance) masses, thus predicting the third (J = 1/2, I = 3/2) Delta resonance, as well as one or two flavor-singlet Lambda hyperon(s), depending on the type of mixing. The effective chiral Lagrangians derived here may be applied to high density matter calculations.Astronomy & AstrophysicsPhysics, Particles & FieldsSCI(E)6ARTICLE1null8
D-FINITENESS, RATIONALITY, and HEIGHT
Full text linkMotivated by a result of van der Poorten and Shparlinski for univariate power series, Bell and Chen prove that if a multivariate power series over a field of characteristic 0 is D-finite and its coefficients belong to a finite set, then it is a rational function. We extend and strengthen their results to certain power series whose coefficients may form an infinite set. We also prove that if the coefficients of a univariate D-finite power series “look like” the coefficients of a rational function, then the power series is rational. Our work relies on the theory of Weil heights, the Manin–Mumford theorem for tori, an application of the Subspace Theorem, and various combinatorial arguments involving heights, power series, and linear recurrence sequences
The Effects of Temperature Aging and Moisture on Some Mechanical Behaviors of Particulate-Filled Rubbers
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Near Wall PIV-Measurements on the Windward Slope of a Hill
No full textThe turbulent flow over periodic hills was measured near to the wall, using planar Particle-Image-Velocimetry (PIV) at high spatial resolution. Our focus is on the near wall turbulence structure on the windward slope of the hill. For large-eddy simulation (LES) we suspect that, if this was not predicted accurately, it affects the prediction of the velocity profiles over the hill crest which in turn will affect the recirculation length downstream of the hill. Regarding the time averaged velocities, we were able to resolve the linear viscous region of the boundary layer. The velocity distribution and also the Reynolds stress does not comply with the law of the wall as it is valid for a turbulent boundary layer at equilibrium
Bactrocera (Bactrocera) paradiospyri Chen, Zhou & Li 2011
No full textBactrocera (Bactrocera) paradiospyri Chen, Zhou & Li, 2011 M a l e l u r e. Methyl Eugenol. D i s t r i b u t i o n. Bhutan, China (Drew & Romig, 2013).Published as part of Korneyev, S. V., Hauser, M., Borkent, C., Maples, B. K., Roubtsova, T. V., Zangpo, T., Dorji, S., Chophel, S., Dorji, N., Tsomo, Dendup, U., Dawa, K., Dorji, L., Dhimal, C. Mani, Kinley, R., Dorji, U., Dema, Y., Korneyev, V. A. & Gaimari, S. D., 2023, The Fruit Flies (Diptera, Tephritidae) In Bhutan: New Faunistic Records And Compendium Of Fauna, pp. 93-124 in Zoodiversity 57 (2) on page 100, DOI: 10.15407/zoo2023.02.093UDC595.773.4, http://zenodo.org/record/788770
Real-space Manifestations of Bottlenecks in Turbulence Spectra
No full textAn energy-spectrum bottleneck, a bump in the turbulence spectrum between the inertial and dissipation ranges, is shown to occur in the non-turbulent, one-dimensional, hyperviscous Burgers equation and found to be the Fourier-space signature of oscillations in the real-space velocity, which are explained by boundary-layer-expansion techniques. Pseudospectral simulations are used to show that such oscillations occur in velocity correlation functions in one- and three-dimensional hyperviscous hydrodynamical equations that display genuine turbulence
Universal Statistical Properties of Inertial-particle Trajectories in Three-dimensional, Homogeneous, Isotropic, Fluid Turbulence
No full textWe obtain new universal statistical properties of heavy-particle trajectories in three-dimensional, statistically steady, homogeneous, and isotropic turbulent flows by direct numerical simulations. We show that the probability distribution functions (PDFs) P(Φ), of the angle Φ between the Eulerian velocity u and the particle velocity v, at a point and time, scales as P(Φ) ∼Φ−, with a new universal exponent ≃ 4
U-Shaped Association of Standardized Serum 25-Hydroxyvitamin D with Risk of Low Muscle Mass: A Population-Based Cross-Sectional Study
No full textGang Zhang,1 Xiaotong Wang,2 Mingyue Tong,1 Jian Chen,1 Qian Ji3 1Department of Rehabilitation, The First Affiliated Hospital of Anhui Medical University, Anhui Public Health Clinical Center, Hefei, Anhui, 230000, People’s Republic of China; 2Department of Cardiology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu, 221000, People’s Republic of China; 3Department of Emergency, The Second Hospital of Nanjing, Nanjing University of Chinese Medicine, Nanjing, Jiangsu, 210003, People’s Republic of ChinaCorrespondence: Qian Ji, Department of Emergency, The Second Hospital of Nanjing, Nanjing University of Chinese Medicine, Nanjing, 210003, People’s Republic of China, Email [email protected]: In the United States (U.S.) general population, the association between standardized serum 25-hydroxyvitamin D (25(OH)D) concentration and risk of low muscle mass (LMM) remains unclear. Our research aimed to determine whether or not there was a relationship between serum 25(OH)D concentration and risk of LMM.Methods: We analyzed the cross-sectional data of the US population that participated in the National Health and Nutrition Examination Survey between 2011 and 2014. The relationship between serum 25(OH)D concentration and LMM risk was evaluated using restricted cubic spline (RCS) with multivariate logistic regression model and subgroup analysis.Results: In all, we included 10,256 people in our analysis. The RCS plot demonstrated a U-shaped relationship between serum 25(OH)D concentration and risk of LMM (P for nonlinearity < 0.05). At a Vitamin D concentration of 38.5 nmol/L, LMM risk was at its lowest. Based on analyses stratified by age, sex, hypertension, and diabetes mellitus (DM), serum 25(OH)D concentration and risk of LMM were U-curve correlated for those age 40 or older, male, with hypertension, or without DM. However, LMM risk was positively related to serum 25(OH)D concentration in those younger than age 40 or in women.Conclusion: There is a U-shaped relationship between serum 25(OH)D concentration and the risk of LMM in the general U.S. population. Careful monitoring and appropriate Vitamin D supplementation might lessen the risk of LMM.Keywords: cross-sectional study, low muscle mass, serum 25-hydroxyvitamin D concentration, National Health and Nutrition Examination Survey, United State
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