Universidade Federal do Ceará

Dymnikova black holes in unimodular gravity: Maxwell sources and vacuum contributions

Abstract In this work, we investigate the Dymnikova regular black hole within the framework of unimodular gravity, emphasizing the role of the effective vacuum sector in the regularization of the geometry. By allowing a controlled violation of the covariant conservation of the en...

Zinc oxide in photocatalytic cementitious materials for environmental remediation and self-cleaning: Performance, limitations, and critical research gaps

Zinc oxide (ZnO) is a promising functional additive for cementitious materials due to its photocatalytic and antimicrobial properties. While numerous studies have reported positive outcomes in terms of pollutant degradation efficiency, antimicrobial performance, and, in some case...

Who bears the burden of monetary tightening? credit default responses across income groups and firm sizes in Brazil

Abstract This paper examines heterogeneous monetary transmission to credit default in Brazil, exploiting granular disaggregation by income bracket, firm size, and state. Using monthly Central Bank data from 2012 to 2024 covering all 27 Brazilian states, we document heterogeneous...

Impact of persistent left bundle branch block on ventricular function and clinical outcomes after transcatheter aortic valve implantation: a systematic review and meta-analysis

Abstract Background New-onset persistent left bundle branch block (NOP-LBBB) is a frequent complication after transcatheter aortic valve implantation (TAVI), but its long-term prognostic impact remains controversial. This meta-analysis aimed to evaluate the impact of NOP-LBBB on...

Microbial Dynamics during the Removal of Linear Alkylbenzenesulfonate (LAS) under Anaerobic and Microaerobic Conditions with Different Co-substrates

Abstract Linear alkylbenzenesulfonate (LAS) is the most widely used anionic surfactant and is commonly found in wastewater due to its extensive use in detergents and cleaning products. Although LAS is biodegradable, its degradation in anaerobic environments remains a challenge, o...

From local hubs to regional impact: harnessing the social and solidarity economy in small-scale fisheries

Abstract The global 2030 Agenda for Sustainable Development calls for more equitable and sustainable pathways by integrating traditional communities into development efforts. Despite these ambitions, challenges persist, as many initiatives, including Social and Solidarity Economy...

Efflux pump inhibition disrupts biofilms and enhances azole susceptibility in Candidozyma auris

Candidozyma auris (formerly Candida auris) is a global emerging fungal pathogen of significant global clinical and epidemiological concern. It is frequently associated with hospital outbreaks, largely due to its multidrug resistance, ability to persist on medical devices, and hig...

Electrostatic Control of Li+ Density and Transport Rate in Double-Gated van der Waals Devices

Abstract Ion transport in crystalline hosts is controlled by an applied potential that simultaneously sets ionic distribution and transport rate, restricting operation to a one-dimensional control space. Here we show that the transport rate of Li+ ions in double-gated van der Waa...

Computational Study of CO2 Capture by Metallic Nanoparticles in Diethylenetriamine Solution

Abstract The high concentration of CO2 present in the atmosphere caused by human action is triggering a series of climate disorders worldwide, such as an increase in global temperatures. Therefore, it is necessary to develop new efficient and sustainable technologies to remove ex...

Topological thermodynamics of generalized Bardeen black hole

Abstract Neves and Saa introduced a two-parameter spacetime that encompasses the Bardeen and Hayward geometries as special cases, together with a case whose f ( r ) function has the Simpson–Visser form. In this work, we employ the off-shell generalized Helmholtz free energy metho...

DWI-FLAIR mismatch versus perfusion-based selection for extended window thrombolysis in acute ischemic stroke: a meta-analysis of randomized controlled trials

To compare efficacy and safety outcomes of DWI–FLAIR mismatch versus CT/MR perfusion-based selection for intravenous thrombolysis (IVT) in extended-window acute ischemic stroke (AIS), we performed a systematic review and meta-analysis of randomized controlled trials enrolling adu...

Resistant Candida spp. in Healthy Individuals: Mapping a Surveillance Blind Spot

The prevalence and characteristics of resistant, biofilm-forming Candida strains in healthy individuals remain poorly understood. In this work, Candida strains from 23 healthy volunteers and 11 candidiasis patients (n = 34) were isolated and characterized. Biofilm formation capac...

Rheology and early structural build-up of alkali-activated Baosteel process slag binders

Abstract Alkali-activated binders (AABs), or geopolymers, have emerged as a sustainable alternative for producing cementitious materials from industrial byproducts. Although several aluminosilicate precursors have already been extensively studied, other potential sources remain u...

Green Hydrogen in Brazilian Media: Dominant Narratives and Missing Dimensions of the Energy Trilemma

ABSTRACT Media discourses help shape the visibility and legitimacy of energy transition pathways in the public sphere. This study examines how Brazilian mainstream newspapers framed green hydrogen and assesses the alignment of these narratives with the energy trilemma: energy sec...

Enhanced Removal of Polystyrene Microplastics in Drinking Water Treatment Using Iron-Modified Activated Carbon

Abstract Granular activated-carbon adsorption is operationally simple and compatible with water-treatment systems, while iron modification may introduce additional interaction sites. However, its benefit for removing polystyrene (PS) microplastics under different pH conditions an...

Climacteric and Non-Climacteric Ripening Patterns of Melons with Focus on Carbohydrate Metabolism and Osmotic Potential

This study investigated the differences between ripening patterns of two homozygous lineages of melons, yellow A5, a non-climacteric inodorus, and Charentais C1, a climacteric cantalupensis, regarding the physiological processes related to postharvest quality with a focus on carb...

Synthesis of ZnO/SnO2 composite films for solar cells

Abstract Metal oxide films are synthesized as semiconductors in solar cells. Zinc oxide is often used as an electrode in solar cells due to its good photoconversion properties. These same properties can be tuned by adding other elements to the main zinc oxide matrix. Dye sensitiz...

Lean management in a low-digitalization context: implementing manual time and motion analysis in a public hospital emergency department

Purpose This study aims to describe the challenges and adaptive strategies involved in implementing a manual chronoanalysis instrument at the entrance of a medium-sized public emergency department in a nondigital context, from a Lean in Emergency Care perspective. Design/methodol...

Amazon Forgotten Fishes. How the remarkable diversity of freshwater fishes is critical to people, rivers and forest

Across the vast sweep of the Amazon Basin, thousands of rivers, streams and floodplain lakes flow in an immense, interconnected waterscape— home to an unparalleled diversity of freshwater fishes. More than 2,700 species have so far been recorded, with dozens more added each year...

Kinetic and Arrhenius modelling of banana quality loss for application in cold-chain management

Banana shelf life along tropical supply chains depends on the distinction between mature-green storage and warmer retail exposure, yet few studies have integrated both thermal regimes into a single predictive framework for ‘Prata’ bananas. This study evaluated temperature-depende...