Abstract. We consider a nonconvex conservation law modelling the settling of particles in ideal clarifier-thickener units. The flux function of this conservation law has an explicit spatial dependence that is discontinuous. Previous works by two of the authors, together with collaborators, have been aimed at providing a firm rigorous ground of mathematical (global existence and uniqueness) and ...

In this paper we compare the method of Lagrangian descriptors with classical Poincare maps for revealing phase space structure two degree-of-freedom Hamiltonian systems. The comparison is carried out by considering dynamics a system having valley ridge inflection point (VRI) potential energy surface. VRI surfaces have four critical points: high saddle and lower separating wells. between points ...

Growth of Red, GIFT and Supreme Nile tilapia strains were evaluated. Fish were cultivated in indoor recirculation systems in 0.5 m3 tanks with controlled temperatures of 22, 28 and 30°C. Random samples of 20 fish from each strain (10 fish tank) were weighed at day 7, 30, 60, 90 and 120. Exponential model (y=Ae) and Gompertz model (y = Aexp(-Be)) were fitted and the estimates parameters were obt...

Flow instability and turbulent transition can be well explained using a new proposed theory--Energy gradient theory [1]. In this theory, the stability of a flow depends on the relative magnitude of energy gradient in streamwise direction and that in transverse direction, if there is no work input. In this note, it is shown based on the energy gradient theory that inviscid nonuniform flow is uns...

We introduce two novel variants of the serpentine waveguide (SWG) slow wave structure (SWS), often utilized in millimeter-wave traveling-wave tubes (TWTs), with enhanced interaction impedance. Using dispersion engineering conjunction transfer matrix methods, we tune guided wavenumber relation to exhibit stationary inflection points (SIPs), and also nonstationary, or “tilted” (TIPs), within domi...

OBJECTIVE To describe temporal patterns in total lymphocyte count (TLC) and hemoglobin (Hgb) concentration during HIV infection and relate these patterns to changes in other markers and to clinical disease. DESIGN Prospective cohort study. METHODS Longitudinal trajectories of total lymphocyte count and hemoglobin from men in the Multicenter AIDS Cohort Study were studied by applying, to eac...