Universidade Federal de Campina Grande

Concentration‐Dependent Lamellar Organization and Structure–Property Relationships in Melt‐Processed EVA /Cloisite 20A Nanocomposites

ABSTRACT The effect of Cloisite 20A content (0–7.5 wt%) on the structural organization and thermomechanical behavior of melt‐processed EVA nanocomposites was systematically evaluated, with emphasis on clay dispersion and lamellar arrangement. X‐ray diffraction revealed a concentr...

Energy-fed commitment: a minimal model of random selection followed by reinforcement

When a symmetric instability is crossed, fluctuations choose one of several equivalent branches. We study a minimal stochastic model of what can then make that choice progressively harder to undo. After selection, the stiffness of the selected state grows in proportion to the ene...

Seismo-ripples

Earthquake prediction has long been considered one of the greatest challenges in the global scientific community due to the complex and uncertain nature of seismogenic processes, along with the prevailing consensus that earthquakes are inherently unpredictable. Here, we present a...

Fermi acceleration mechanisms beyond Lorentz symmetry

Abstract We construct models for first- and second-order Fermi acceleration of particles, incorporating generic frame transformations, dispersion relations, and conservation laws. Within this framework, we study deformations of Lorentz symmetry via the $$\kappa $$ κ -Poincaré alg...

Drying behavior, thermodynamic properties, and functional stability of taioba starch enriched with leaf bioactive extracts

Abstract This study evaluated the drying kinetics, thermodynamic properties, physicochemical characteristics, bioactive compounds, and antioxidant activity of native and enriched taioba starches obtained from Xanthosoma sagittifolium . Native starch (CS) and starches enriched wit...

Predicting barrier-fluid failure for temporary abandonment of petroleum wells with a tabular foundation model

Temporary well abandonment may rely on liquid barrier fluids that must retain integrity under temperature–time exposure. It was evaluated whether supervised learning can predict barrier-fluid failure from routine laboratory measurements (pH, density, apparent viscosity) obtained...

Existence and multiplicity of normalized solutions to a large class of elliptic equations on bounded domains with general boundary conditions

Abstract In this paper, by adapting the perturbation method, we study the existence and multiplicity of normalized solutions for the following nonlinear Schrödinger equation { − Δ u = λ u + f ( u ) in Ω , B α , ζ , γ u = 0 on ∂ Ω , ∫ Ω u 2 d x = μ , ( P ) α , ζ , γ μ where Ω ⊂ R...

Agro-Industrial Coproducts as Sustainable Substrates for Colorant Biosynthesis by Talaromyces sp.

Natural colorants derived from filamentous fungi have gained increasing attention as safe, sustainable, and bioactive alternatives to synthetic counterparts. This study evaluated the red colorant production by Talaromyces sp. under solid and static submerged culture conditions, f...

Gravitational wave signatures and periodic orbits of a charged black hole in a Hernquist dark matter halo

Abstract In this work, we study the motion of massive test particles and the gravitational wave emission associated with periodic trajectories around a magnetically charged black hole immersed in a Hernquist dark matter halo. We begin by analyzing the effective potential and the...

Erector Spinae Block in Bariatric Surgery: a Systematic Review and Meta-Analysis of Randomized Controlled Trials

Abstract Introduction Obesity is a growing global health issue, and bariatric surgery offers effective weight loss outcomes. Postoperative pain management remains a challenge, with multimodal analgesia and regional blocks like the erector spinae plane (ESPB) showing promise. This...

MoO3/ZnMoO4 Composite Obtained in a One-Pot Reaction and Applied in the Production of Biodiesel from Acid Feedstocks

Abstract Despite being widely recognized within the scientific community, the synthesis of biodiesel from acidic feedstocks remains challenging. In this work, a heterogeneous catalyst comprising molybdenum trioxide and zinc molybdate (MoO3/ZnMoO4) was synthesized via the modified...

Transformative hospitality through community-led artistic interventions

Purpose This study aims to examine how community-led artistic interventions activate early-stage processes of transformative hospitality. It is based on the case of Altofest, an international contemporary art festival in Naples. Design/methodology/approach This qualitative interp...

Trends of Laponite® Clay Mineral as an Excipient in Pharmaceuticals, Cosmetics and Medical Devices: Patent Analysis

Abstract Purpose This patent-based systematic review investigates the scientific and technological trends involving Laponite®, a synthetic clay mineral composed of disc-shaped nanoparticles. Due to its rheological, structural, and biocompatible properties, Laponite® has gained at...

Neutrino oscillations in a Kalb–Ramond black hole background

Abstract The analysis examines how neutrinos behave when their trajectories unfold around a black hole sourced by a Kalb–Ramond field, where spontaneous Lorentz symmetry-breaking reshapes the surrounding geometry. Instead of following the conventional order, the study focuses fir...

A Brief overview on the existence of solution to a class of quasilinear integro-differential equations

Abstract In this paper, we are concerned with a class of integro-differential equations whose prototype is given by $$\begin{aligned} \left\{ \begin{array}{lcl} -div(a(u)\nabla u)+\eta \psi (x)\int _{\Omega } \varphi u = f(x,u), \text { in } \Omega ,\\ u=0, \text { on } \partial...

A near-sunset atmospheric sounding during the 14 October 2023 annular solar eclipse over Natal

Abstract. Solar eclipses are transient atmospheric events that cause rapid localized reduction in solar radiation, which produces complex changes associate with the vertical coupling of the layers. This study investigates the vertical response of the neutral atmosphere to the 14...

Mobilização social e ação coletiva no Semiárido Brasileiro: convivência, agroecologia e sustentabilidade

This text seeks to reflect on the trajectory of social mobilization for the construction of the notion of coexistence with the semi-arid, from the decade of 1990. The coexistence of the human being with his environment is an essential dimension of Agroecology, having as perspecti...

Black Hole Gravitational Phenomena in Higher-Order Curvature–Scalar Gravity

This work aims to explore the gravitational consequences of a recently proposed black hole solution previously introduced, which incorporates quantum gravitational corrections of General Relativity. We initiate our analyses by taking into account the horizon structure, focusing o...

Rhizobium spp. strains improve the physiological attributes of Mimosa tenuiflora (Willd.) Poiret seedlings under different water contents

Rhizobium spp. inoculation is a strategy to promote plant growth and enhance drought tolerance, particularly in semiarid environments. This study evaluated the morphological and physiological responses of Mimosa tenuiflora (Willd.) seedlings inoculated with Rhizobium spp. under d...

DNA detection of Babesia bovis in sheep, ticks and cattle during an outbreak of sheep ixodidiosis by Rhipicephalus microplus

This study describes, for the first time, the molecular and phylogenetic detection of Babesia bovis in sheep, with concurrent detection in cattle and R. microplus ticks during a severe tick infestation outbreak in northeastern Brazil. The affected herd, located in São Pedro, Rio...