Universidade Federal do Piauí

Thermal Cycle–Microstructure–Property Relationships in Rail Steel Heat‐Affected Zone Simulated by Gleeble

This study investigates the microstructural evolution and mechanical response of premium rail steel subjected to heat‐affected zone (HAZ) thermal cycles representative of flash butt welding (FBW). Dilatometry experiments were performed using a Gleeble thermomechanical simulator....

Silicon Fertigation and Azospirillum brasilense Modulate the Microbiological Profile of Total Mixed Ration Silage for Dairy Goats

The objective of this study was to evaluate the effects of fertigation with silicon (Si) combined with inoculation with Azospirillum brasilense during off-season corn cultivation on the fermentation profile, microbiological quality, and chemical and bromatological composition of...

Test Co-Evolution and Coding-Agent Adoption in Open-Source Software Repositories

This artifact accompanies the study “Test Co-Evolution and Coding Agent Adoption”, which investigates the relationships between coding-agent adoption, production–test co-evolution, and post-adoption corrective maintenance in open-source repositories. It includes datasets covering...

Multimodal LLMs for Leprosy Diagnostic Support: Evaluating Performance and Healthcare Professionals’ Trust and Acceptance

Leprosy remains a major public health challenge in high-burden regions, where its clinical similarity to other dermatoses and reliance on clinical assessment can contribute to delayed diagnosis. Although multimodal Large Language Models (LLMs) have shown potential for dermatologi...

Global Existence and Exponential Stability of a Boundary Contact Problem for the 2D Mindlin–Timoshenko System

Abstract We analyze a contact problem for the two-dimensional Mindlin–Timoshenko system describing the vibratory motion of elastic plates in unilateral contact with a rigid obstacle along a portion of the boundary. Precisely, we establish the existence of solutions and prove that...

Applications and research gaps in quantum natural language processing: a scientometric analysis

Abstract Quantum Natural Language Processing (QNLP) applies quantum computational models to the representation and processing of language, yet its literature remains fragmented, and no prior study treats it as an autonomous object of analysis. This study maps the field by combini...

Individual Differences in Self-Regulation Do Not Predict Firearm Skill Acquisition During Police Training: A Longitudinal Study of 205 Trainees

Police firearm training requires perceptual discrimination, decision-making, speed–accuracy control, and technical motor execution under institutional evaluation. This retrospective longitudinal study examined whether self-regulation-related psychological characteristics predicte...

Genesis and properties of representative Ferralsols from the Brazilian Cerrado of Piauí

Abstract Ferralsols cover substantial areas in tropical regions, yet their pedogenesis on sedimentary rocks remains insufficiently understood. This study aimed to characterize the morphological, physical, chemical, and mineralogical properties of five representative sandy-texture...

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...

Recent advances in the application of electrospun nanofibrous scaffolds in bone regeneration

This review synthesizes recent advances in electrospun nanofibrous scaffolds for bone tissue engineering (BTE), with emphasis on critical-size bone defects (CSDs) and the limitations of autologous bone grafting. We critically evaluate hybrid strategies that combine electrospinnin...

Inclusion and assistive technologies in disability rights legislation: a cross-country NLP-based comparative analysis

Abstract This study analyzes and compares the thematic structures of two landmark disability rights laws: the Americans with Disabilities Act (ADA) and the Lei Brasileira de Inclusão da Pessoa com Deficiência (Brazilian Law of Inclusion, BLI; Law No. 13.146/2015), to explore how...

Knowledge as a predictor of parental vaccine hesitancy during children's first year of life

Objective To analyze knowledge about childhood vaccination as a predictor of vaccine hesitancy among parents or guardians of children in the first year of life. Methods This cross-sectional analytical study was conducted in Piauí, Brazil, with 452 parents or guardians of children...

Green Chemistry Oriented Pluronic F127/Carbopol Nanogel Platform (NGLp) Encapsulating Lippia pedunculosa Essential Oil for Aedes aegypti Larval Control

Abstract Control of Aedes aegypti larvae is essential to reduce arbovirus transmission; however, increasing insecticide resistance and environmental concerns highlight the urgent need for sustainable alternatives. In this study, a solvent-free thermoresponsive nanogel (NGLp), bas...

Woven endobridge device compared to stent-assisted coiling and microsurgical clipping for intracranial aneurysms

Background: Endovascular techniques and devices, including Woven EndoBridge (WEB) and stent-assisted coiling (SAC), expand the choice of therapies for complex aneurysms, while the evidence directly comparing them to microsurgical clipping (MSC) remains very limited. This meta-ana...

A mechanistic approach about oxidative, mutagenic, and cytotoxic effects of an organotellurane

Abstract Organotellurium (OTe) compounds have pharmacological properties, including leishmanicidal, antimalarial, and antifungal activities. Herein, we assessed cytotoxicity effects of OTe RF07 in a panel of tumor cell lines, as well as its oxidative, toxicity, and hemolytic acti...

VLA-4 integrin modulates cellular responses to sorafenib in metastasis-related processes of B16F10 melanoma cells

Metastatic progression in melanoma is driven by the coordinated activity of adhesion molecules and growth factor receptors, yet the functional interplay between integrins and VEGFR-related signaling remains poorly defined. This study investigated the role of α4β1 integrin, also k...

Macroecological invisibility in apple snails (Gastropoda: Ampullariidae): uneven occurrence and molecular coverage across public repositories

Abstract Apple snails (Ampullariidae) are freshwater gastropods of ecological and economic importance, but their digital representation remains uneven across taxa, regions and data types. Using a 171-species taxonomic reference, we integrated global occurrence and molecular data...

Surface Topography Improvement of Micro-Milled Inconel 718 Slots Through Abrasive Deburring: Comparison Between Polishing and Sanding

Burr formation remains a major challenge in micro milling due to reduced tool dimensions and size-effect phenomena, particularly when machining difficult-to-cut materials such as Inconel 718. This study compares the effectiveness of two abrasive deburring processes, polishing and...

Endovascular therapy versus best medical treatment in pediatric acute ischemic stroke: A systematic review and meta-analysis

Purpose This systematic review and meta-analysis evaluates endovascular therapy (EVT) versus best medical treatment (BMT) in pediatric acute ischemic stroke (AIS) due to large-vessel occlusion. Methods Systematic searches were conducted across PubMed, Cochrane, and Embase, incept...

Smart Coatings Integrating Antimicrobial and Tissue‐Remodeling Functions for Implant Interfaces

AIM: This study aimed to assess the antimicrobial performance and biocompatibility of our drug delivery platform, based on layer-by-layer (LbL) coating incorporating tetracycline (TC) complexed with anionic β-cyclodextrin (TCβCD) and a pH-responsive poly(methacrylic acid) (PMAA)...