A5101922514- Telecommunications and Broadcasting Technologies
- Millimeter-Wave Propagation and Modeling
- Advanced MIMO Systems Optimization
- Power Line Communications and Noise
- Conservation, Biodiversity, and Resource Management
- Ecology and Vegetation Dynamics Studies
- Image and Video Quality Assessment
- Video Coding and Compression Technologies
- Wireless Communication Networks Research
- Computational Fluid Dynamics and Aerodynamics
- Advanced Wireless Communication Techniques
- Aerodynamics and Fluid Dynamics Research
- Fire effects on ecosystems
- Advanced Adaptive Filtering Techniques
- Agroforestry and silvopastoral systems
- Fluid Dynamics and Turbulent Flows
- Wireless Networks and Protocols
- Aerospace Engineering and Energy Systems
- Advanced Antenna and Metasurface Technologies
- Biomimetic flight and propulsion mechanisms
- Forest ecology and management
- Antenna Design and Optimization
- PAPR reduction in OFDM
- Chemistry Education and Research
- Microwave Engineering and Waveguides
Universidade Federal do Pará
2010-2024
RMIT University
2024
Material (Belgium)
2022
Instituto Florestal
2018-2020
University of the Aegean
2015
Naval Postgraduate School
2000-2002
Drought-induced wildfires have increased in frequency and extent over the tropics. Yet, long-term (greater than 10 years) responses of Amazonian lowland forests to fire disturbance are poorly known. To understand post-fire forest biomass dynamics, assess time required for fire-affected recover pre-disturbance levels, we combined 16 single with 182 multiple census into a unique large-scale dataset across Brazilian Amazonia. We quantified biomass, mortality wood productivity burned plots along...
Abstract Wildfires in humid tropical forests have become more common recent years, increasing the rates of tree mortality that not co-evolved with fire. Estimating carbon emissions from these wildfires is complex. Current approaches rely on estimates committed based static emission factors through time and space, yet cannot be assigned to specific thus are comparable other temporally-explicit sources. Moreover, gross estimates, whereas long-term consequences require an understanding net...
This paper presents a performance comparison between known propagation Models through least squares tuning algorithm for 5.8 GHz frequency band. The studied environment is based on the 12 cities located in Amazon Region. After adjustments and simulations, SUI Model showed smaller RMS error standard deviation when compared with COST231-Hata ECC-33 models.
In this work, a new method employs Bioinspired Computational (BIC) optimization from the genetic algorithm, bat and flower pollination algorithm. Robust accurate modeling of input parameters adjusts propagation models Stanford University Interim, Electronic Communication Committee, Floating Interception that consider environments with characteristics specifically urban regions in Amazon. The lack research related to development for Amazonian motivated work. Thus, application proves...
Metal-composite hybrid joints with through-thickness pins are high-performing, but a study is needed on manufacturing resin-infused composites large pin angles. Single-pin metal-composite were investigated angles of 0°, 20°, 45° and 80°. Microstructural characterisation revealed the insertion zone varied significantly angle along length. With increasing angle, diamond-like resin-rich became triangular, asymmetric, reduced in size to effectively zero. Other complex novel features observed as...
The communication channel is a critical part of the process information degradation. In 4K ultra-resolution video transmission domain, crucial where degradation occurs, inevitably leading to errors during reception. To enhance in terms fidelity, advanced technologies such as digital broadcasting terrestrial (DVB-T) and its evolutionary successor, second generation (DVB-T2), are utilized mitigate effects data errors. Within this scenario, research presents an innovative methodology for...
AMAZON MATOGROSSENSE.This study evaluates the chemical processes responsible for nitrous oxide (N 2 O) and methane (CH 4 ) fluxes in managed pasture (PM) unmanaged (PNM).In addition, impact of nitrogen fertilization on N O CH was assessed.The experiments were conducted three farms Alta Floresta city state Mato Grosso.Both regular intensive samples collected from PM, PNM, forest areas each properties.The gases sampled using static chambers morning.Higher recorded PMs, whereas showed no...
In this work is presented a hybrid bioinspired optimization technique that associates General Regression Neural Network (GRNN) with the Multiobjective Bat Algorithm (MOBA), for design and synthesis of Frequency Selective Surfaces (FSS), aiming its application in data communication systems by diffusion millimeter waves, specifically, IEEE 802.15.3c standard. The designed device consists planar arrangements metallizations (patches), diamond-shaped, arranged over RO4003 substrate. FSS proposed...
This work discusses video communications over wireless networks (IEEE 802.11ac standard). The videos are in three different resolutions: 720p, 1080p, and 2160p. It is essential to study the performance of these media access technologies enhance current coding techniques. sets out a quality prediction model that includes resolutions based on network terms conditions, an approach has not previously been adopted literature. involves obtaining Service Experience Quality Metrics, such as PSNR...
Background: Most work in Amazonia has concentrated on dense lowland evergreen rain forest, a vegetation type with >40% cover. Large parts of southern are covered by open physiognomically dominated high abundance palms. This received relatively little attention so far. Understanding the key predictors above-ground biomass (AGB) across scales is important to accurately quantify impacts land cover change terrestrial carbon budget.Aims: We assessed structure Amazonian forests, Brazil, relative...
A numerical investigation of the transonic twodegree-of-freedom bending/torsion flutter characteristics NLR 7301 section is carried out using a time domain method. The simulations include wind tunnel walls in order to improve aerodynamic predictions by modeling experimental flow conditions more closely. An implicit, accurate, two-dimensional, compressible, thin-layer Navier-Stokes solver coupled with two-degree-of-freedom structural model. three-block grid used for discretization including...
This paper presents a new terrain proposal for SUI propagation model equations. is based on wooded cities (found in Amazon region). The parameters the proposed are obtained from LS (Least Squares) optimization 5.8 GHz path loss data. Results show that has better representation of measured
The feasible choice of a propagation model for given wireless system depends on environment type among other factors. Thus, it is crucial decision radio network planning. This current proposal new methodology applied LTE systems that includes: to find optimal parameters minimizes RMS error and maximizes grey relation grade mean absolute percentage error, (GRG- MAPE) in city-forest through the use meta- heuristic optimization such as Cuckoo Search (CS). results, quantitatively analysed by...
This paper presents a propagation model for prediction of path loss and performance parameters (throughput frame loss) on OFDM-based networks. For this study, measurements 5.8 GHz Wimax network were carried out. The proposed have been adjusted by LS (Least Squares) optimization, using measured data as reference. results show that the has good agreement with measurements. Futures works can consider an adjustment set frequencies. purpose, extensive campaigns will be
This work presents results for multimedia transmission using wireless broadband networks installed in some remote cities Amazon region. In 15 at State of Para, Brazil, the local government is installing to provide wideband internet access public agents, such as schools, hospitals, police stations and office buildings a great project named NavegaPara. Each city has base station working on 5.7 GHz serving around 30 subscribers, which use an individual transceiver (IBT) network. The aggregate...