Universidade de Brasília

iSAGE: A Human-in-the-Loop Framework for Remote Sensing Semantic Segmentation via Sparse Point Supervision

Training semantic segmentation models is especially costly in remote sensing, since most problems require a new dataset as targets vary with resolution, sensors, and region. Approaches to reduce this cost are increasingly common, but most add machinery that expands few labeled pi...

Structural Performance of Hybrid Fiber–Metal Laminates Reinforced With Natural and Synthetic Fibers: Tensile, Dynamic–Mechanical, and Residual Stress Behavior

ABSTRACT This work studied how hybridization between natural and synthetic fibers influences the structural tensile performance, viscoelastic response, and residual stress distribution in fiber–metal laminates (FMLs). Two groups of laminates were produced: (i) fiber‐reinforced po...

Assemblage structure and ecological functions of dung beetles in exotic pastures in the Southwestern Amazon

Abstract The implementation of exotic pastures in the Amazon causes drastic negative impacts on its biodiversity. Nevertheless, some species with the ability to colonize pastures may provide important ecosystem services for livestock development in tropical pastures, as in the Am...

New variations on the theme of Baer’s theorem

Abstract Let $$\gamma _s(G)$$ γ s ( G ) and $$Z_s(G)$$ Z s ( G ) denote the s -th terms of the lower and upper central series of a group G , respectively. A classical theorem by R. Baer states that if $$Z_s(G)$$ Z s ( G ) has finite index in G , then $$\gamma _{s+1}(G)$$ γ s + 1...

Complex breeding phenological shifts of neotropical birds across space and time

Climate change is altering breeding phenology patterns in different ways across regions, periods and species. We examined spatial and temporal variation in the breeding phenology of four Neotropical birds, specifically testing whether the magnitude of phenological shifts increase...

Circulating Matrix Metalloproteinase Activity and Functional Capacity in Individuals Undergoing Hemodialysis: Exploratory Findings from a Resistance Training Trial

Abstract Purpose To investigate the effects of 24 weeks of resistance training (RT) on pro- and active matrix metalloproteinases (MMPs) and their association with functional performance in end-stage kidney disease (ESKD) patients undergoing hemodialysis. Methods Forty-two ESKD pa...

Characterisations of finite groups by subsets of commutators

Abstract Given a finite group 𝐺 and an element 𝑥 of 𝐺, let K x ⁢ ( G ) K_{x}(G) denote the set of commutators [ x , g ] [x,g] as 𝑔 varies through 𝐺. We prove that various group theoretical properties of 𝐺, for instance, nilpotency of several subgroups of 𝐺 and the existence of a...

Factors associated with discordance between the patient-reported Rheumatoid Arthritis Disease Activity Index (RADAI) and the Simplified Disease Activity Index (SDAI) concerning the achievement of treat-to-target goals – data from the REAL study

Abstract Background Treat-to-target (T2T) strategies in rheumatoid arthritis (RA) rely on regular assessment of disease activity using validated composite indices, with remission or low disease activity as therapeutic goals. The Simplified Disease Activity Index (SDAI) is widely...

Remote SAMsing: From segment anything to segment everything

The Segment Anything Model 2 (SAM2) produces high-quality zero-shot segmentation of natural images, but two obstacles block its use at scale for remote sensing. First, the automatic mask generator trades coverage against quality: strict acceptance thresholds leave most of a scene...

Aerial Application of Granular Potassium Chloride: Effects of Flight Height and Application Rate on Deposition Uniformity

The pursuit of greater efficiency in agricultural operations, particularly in input application, has led producers to adopt strategies aimed at minimizing production costs. Aerial fertilizer application has emerged as a viable alternative due to its high operational efficiency an...

Termites play a crucial role in forming major tropical soils: insights from a deep Ferralsol

Abstract Soil bioturbation is increasingly recognized as a key driver of pedogenesis in tropical ecosystems, influencing above- and below-ground biodiversity, nutrient cycling, and aggregate stability across different spatial and temporal scales. This ecological process may play...

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...

On the Relationship between Polysemy and Type Frequency

Zipf and others in his wake examined the relationship between polysemy and token frequency but largely neglected the relationship between polysemy and type frequency. To redress this balance, an analysis was performed of seven samples from four languages, which can be classified...

Enhanced pozzolanic activity of microcrystalline cellulose via silane modification for cementitious composites

Abstract This study evaluated the effect of surface functionalization of microcrystalline cellulose (MCC) with tetraethyl orthosilicate (TEOS) on its physicochemical properties and the performance of cement-based microconcretes incorporating the modified material. Eleven MCC samp...

Fire as a productive and preventive technology: traditional knowledge and risk governance in Kalunga agropastoral mosaics

Abstract Background Savanna landscapes have returned to the centre of socio-environmental debate as climate variability, agricultural expansion, and prohibition-oriented policies reshape how fire is understood and governed. Focusing on Brazil’s largest maroon (quilombola) territo...

A large-scale in silico chimera-based strategy for engineering low-immunogenic L-asparaginase from Penicillium cerradense

L-asparaginase (L-ASNase) is an amidohydrolase with high therapeutic value for the treatment of acute lymphoblastic leukemia (ALL). However, its clinical application is limited by immunogenicity, allergenicity, and adverse effects from glutaminase activity. In this study, we engi...