Universidade Estadual da Paraíba

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...

Fermionic Casimir effect in an axial Lorentz-violating background

Abstract We investigate the fermionic Casimir effect for a Dirac field confined between two parallel plates with MIT bag boundary conditions in the presence of CPT-odd Lorentz symmetry violation described by a constant axial background vector $$b_{\mu }$$ b μ . The exact mode qua...

Traceability of Manilkara huberi Using Stable Isotope Ratio Analysis to Support Deforestation Prevention in the Amazon

Abstract Illegal deforestation represents one of the main challenges to the integrity of the Amazon rainforest, warranting the use of reliable tracking methods to identify the geographical origin of timber species inspected during commercial transactions. This study utilizes stab...

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...

A new species and a new status in Heliotropium (Heliotropiaceae) from Brazil

Summary We present two taxonomic novelties in the Heliotropiaceae: Heliotropium burchellii (I.M.Johnst.) J.I.M.Melo, a new status for Heliotropium elongatum (Lehm.) Gürke var. burchellii I.M.Johnst., restricted to the central-western and northern regions of Brazil, and Heliotropi...

A Multidimensional Approach to α- and β-Diversity of Fish Assemblages in Tropical Estuaries Under Semiarid Influence

Abstract Functional adaptations enable estuarine fishes to exploit habitats along environmental gradients. This study investigated how geomorphological and anthropogenic features of three tropical Brazilian estuaries within semi-arid river basins (Mamanguape, Paraíba, and Gramame...

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...

Potassium Humate and Bacillus aryabhattai Modulate Osmotic and Oxidative Homeostasis and Promote Cowpea Yield Under Drought

Global climate change has intensified prolonged droughts, making the development of sustainable agricultural technologies essential. Although potassium humate (KH) and Bacillus aryabhattai (BA) are recognized individually as effective biostimulants, their joint application repres...

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...

Metodologias Participativas em Agroecologia: redes, processos e estratégias rumo a uma Pedagogia do Alimento

This article, based on a theoretical and methodological approach, starts from the criticism made by the New Philosophy of Science and its influence on the Liberating Education in Brazil and Latin America, highlighting the growing relationship of popular participation and Agroecol...

Longitudinal gradients modulate the distribution, composition, and ecological risk of microplastics in a neotropical public water supply reservoir

Abstract Microplastics (MPs) contamination was assessed in the water and surface sediment in the upstream, dam, and downstream zones of the Tapacurá Reservoir, a tropical public water supply system in northeastern Brazil, over the course of four sampling campaigns. MPs were detec...

Biodegradable pectin films incorporating purple sweet potato anthocyanins for real-time shrimp freshness monitoring

This study aimed to develop biodegradable films using pectin extracted from orange peel residues, purple sweet potato extract, and glycerol, with potential application for monitoring shrimp freshness. The physical, barrier, mechanical, bioactive, antioxidant, morphological, struc...