Universidade Estadual de Maringá

Sensitivity-Based Reference-Time Scaling for Local Orthogonalization of Fractional-Order Model Parameters

Fractional-order models are useful for describing systems with memory, anomalous relaxation, and non-classical dynamic behavior. However, parameter estimation in these models may be affected by strong covariance between the kinetic coefficient and the fractional order, reducing t...

Lessons learned from a Kaggle challenge for particle picking in cryo-electron tomography

Abstract The difficulty of particle picking in cryo-electron tomography remains a barrier to routine in situ structure determination. Machine learning is well-suited to overcome this bottleneck with efficient algorithms that generalize across molecular species. To spur new algori...

An Evidence-Level Framework for Evaluating Enzyme-Mediated Plastic and Microplastic Transformation

Microbial enzymes have attracted considerable attention as biocatalysts for plastic transformation, yet the experimental evidence supporting reported biodegradation varies substantially in quality and interpretation. Surface-sensitive techniques, molecular-weight analyses, identi...

Finite time blow-up and global solutions for the viscoelastic wave equation with combined power-type nonlinearities

The main objective of this paper is to investigate the global existence and nonexistence of solutions to the viscoelastic wave equation with a linear memory term of Boltzmann type, a nonlinear friction damping and a supercritical source term which is a combination of power-type n...

Unraveling patterns of intraspecific variations in the diet and morphological traits of Apareidon vladii Pavanelii 2006, a threatened Neotropical freshwater fish

We described the between–individual variations and compared the diet and morphology of Apareiodon vladii Pavanelli 2006 populations from three rivers in protected areas, South Brazil. Body shape variables and trophic traits were used to describe the morphology of the species and...

How retailer prestige drives sales performance and turnover: the mediating role of organizational identification and moderating role of professional identification

Purpose Retailer organizational prestige is defined as employees' own beliefs and perceptions about how individuals external to the organization judge and evaluate the status and prestige of their firm. Although researchers and professionals recognize that retailer organizational...

Exact Boundary Controllability for Wave Equations With Space Variable Potential

ABSTRACT In this article, we study an exact boundary controllability problem for a wave equation with a potential that varies in the space on non‐smooth domains of , . The potential considered is a positive space variable function which has the short‐range property, that is when...

Advances and Research Gaps in Ecological Niche Modeling of Amazonian Wetland Plants: A Systematic Review

Ecological niche modeling (ENM) is widely used to predict species distributions and support biodiversity conservation under environmental change, yet its application to Amazonian wetland plants has not been systematically synthesized. We conducted a systematic review following th...

Pilot-scale optimization of atmospheric acid leaching for enhanced nickel and cobalt recovery from laterite ore

Nickel and cobalt are critical metals predominantly extracted from laterites. However, deposits with high iron content (>15%) and SiO2/CaO + MgO ratios (∼1.8) limit the applicability of conventional pyrometallurgical routes. In this scenario, hydrometallurgical processes, particu...