The State University of Maringá (Portuguese: Universidade Estadual de Maringá, UEM) is a public university whose main campus is in Maringá, Paraná, Brazil. It was founded in 1970 and recognized in 1976 by the Federal Government of Brazil. Its academic population is estimated in 18,000 people among professors, undergraduates, graduate students and manager technicals. UEM has 48 undergraduate courses and about 25 graduate programs. The university has 5 campuses in Maringá, Goioere, Cianorte, Cidade Gaúcha and Umuarama, all cities located in Paraná state.
In this paper we study of a coupled thermoelastic system with viscoelastic damping term and Wentzell boundary conditions. We prove the existence as well as the stability of the energy associated to the problem. To prove the existence of solution we use semigroup theory and the stability is proved by multipliers techniques. The main goal is to bring the viscoelastic damping into the discussion concerning thermoelastic systems with Wentzell boundary conditions.
This study investigates the serviceability behaviour of externally prestressed steel concrete composite cellular beams. The effects of tendon layout, web opening geometry, steel cross section, span to depth ratio, and prestress level on the serviceability bending moment were evaluated. A cross-section equilibrium formulation based on the plastic stress block approach of ABNT NBR 8800 and EN 1994–1–1 was also assessed. A three-dimensional finite element model was developed in ABAQUS and validated against experimental results, with a mean experimental to numerical ratio of 0.993. A parametric study comprising 450 simulations considered eight prestressed tendon layouts, a non-prestressed reference, two opening ratios, three steel profiles, three span to depth ratios, and three prestressing levels. External prestressing increased the serviceability bending moment by 18.5–50.5% across the steel profiles, with draped layouts providing the largest gains. Sensitivity analysis identified the steel profile as the dominant parameter, with a relative influence of 62.6%, followed by tendon layout at 35.8%. The equilibrium formulation systematically overestimated the numerical results, with a mean ratio of 0.588. A linear calibrated expression and a pruned quadratic response surface were then developed using nine dimensionless predictors. The quadratic form reached a correlation coefficient of 0.932, with 83.9% of predictions within 10% and a mean numerical to predicted ratio of 1.000.
We investigate the asymptotic dynamics of the two-dimensional Lam & eacute; system with linear damping and a fully coupled nonlinear vector field exhibiting exponential growth. A key analytical tool in our approach is the use of a sharp Trudinger-Moser estimate, which allows us to establish crucial quasi-stability and smoothing properties for the corresponding dynamical system. As a consequence, we prove the existence of both global and exponential-type attractors with finite fractal dimension. To the best of our knowledge, this is the first contribution addressing the 2D Lam & eacute; system in the evolution scenario with exponential nonlinearity.
Background Challenges during critical developmental periods, such as postnatal overfeeding, can affect an organism’s development and increase its susceptibility to metabolic syndrome in adulthood. Nutritional or pharmacological interventions during this stage may mitigate this condition. Objective Given the wide therapeutic properties of Goji berries, we aimed to evaluate whether supplementing the diet of lactating female rats with these could prevent the development of metabolic disorders in adult offspring raised in small litters. Methods Pregnant Wistar rats were used to prepare the litters. Two days after birth, male rats were divided into three groups: a normal litter (NL) with nine pups; a small litter (SL) of three pups; and a litter with three pups whose mothers were supplemented daily with 250 mg/kg of Goji berry extract during lactation (SLGB). All animals were monitored for 13 weeks postnatally. Results Maternal supplementation with Goji berry extract during lactation significantly decreased body weight gain, dyslipidemia, the atherogenic index, and the adiposity index. It also improved insulin resistance and glucose intolerance, presented a possible hypertrophic effect on skeletal muscle, and increased the uncoupling protein 1 (UCP-1) expression in the offspring in adulthood. Conclusions Maternal supplementation with Goji berry extract had long-lasting effects and prevented the development of metabolic syndrome in the adult offspring that were overfed early in life.
This paper is concerned with the well-posedness and asymptotic behavior of a plate equation with degenerate memory and localized frictional damping in the case that the exponent of nonlinear source term is at most critical. When the memory term is non-degenerate and the memory kernel decays exponentially, the corresponding dynamical system possesses a global attractor without requiring any additional dissipation. In this paper, we address the degenerate case by introducing a supplementary frictional damping. Despite the fact that the dissipation arises from two partial damping terms of different natures, neither of which necessarily satisfies a geometric control condition, we can still prove the well-posedness of such problem based on the nonlinear semigroup theory under some suitable assumptions. Moreover, we also prove the existence of a finite dimensional global attractor by verifying the existence of a strict Lyapunov functional and establishing the desired quasi-stability inequality.
