Path Loss
Mostrando 1-12 de 51 artigos, teses e dissertações.
-
1. Chemometric Evaluation of Poly(3-hexylthiophene) Electrochemical Aging Path as a Function of Electrochemical Synthesis Variables
Conductive polymers are versatile materials that can be applied in many different technology fields, especially green energy. They have several advantages, such as easy synthesis, low density, and cost. However, its electric conduction property is also related to material aging with great loss of their characteristics, limiting their applicability. The in-de
Journal of the Brazilian Chemical Society. Publicado em: 2022
-
2. On the Use of UTD-Based Models for RF Path Loss Prediction Due to Diffraction on a Forest-Covered Ridge
Abstract Irregular terrains covered with forest vegetation represent a challenging scenario for radio planning. A case of particular interest is the one where a forest-covered high hill or mountain is interposed to the link, for which typical diffraction loss models usually apply as good approximations, even disregarding the vegetation influence. Pragmatic a
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-06
-
3. Corrigendum
Abstract Irregular terrains covered with forest vegetation represent a challenging scenario for radio planning. A case of particular interest is the one where a forest-covered high hill or mountain is interposed to the link, for which typical diffraction loss models usually apply as good approximations, even disregarding the vegetation influence. Pragmatic a
Braz. J. Psychiatry. Publicado em: 2021-06
-
4. 90 anos de Problemas da criação de Dostoiévski (1929-2019): o texto em seu e em nosso tempo
Abstract Irregular terrains covered with forest vegetation represent a challenging scenario for radio planning. A case of particular interest is the one where a forest-covered high hill or mountain is interposed to the link, for which typical diffraction loss models usually apply as good approximations, even disregarding the vegetation influence. Pragmatic a
Bakhtiniana, Rev. Estud. Discurso. Publicado em: 2021-06
-
5. Brazilian assessment on biodiversity and ecosystem services: summary for policy makers
Resumo: A biodiversidade e os ecossistemas são elementos importantes para enfrentar as crises socioeconômicas e ambientais nacionais e globais, uma vez que proporcionam novas oportunidades de desenvolvimento. Incorporar a biodiversidade na vida cotidiana é uma oportunidade de ouro para promover o uso sustentável da biodiversidade e dos serviços ecossist
Biota Neotrop.. Publicado em: 24/10/2019
-
6. Ray Tracing and Applications to an Evaporation Duct Model Based on Data from Oceanographic Buoy Sensors
Abstract The two-dimensional ray tracing method allows an easy and fast modeling of tropospheric propagation in the microwave frequency range. A version of this method that determines ray trajectories, amplitudes and delays of the electromagnetic field, as well as the propagation loss in a two-dimensional inhomogeneous environment will be described. The impl
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2019-03
-
7. Reinforced Concrete Beam-Column Inverted Knee Joint Behaviour after Ground Corner Column Loss-Numerical Analysis
Abstract Beam-column joints are critical component in the load path of reinforced concrete (RC) frames, due to their role in transferring loads among different RC frame components. The loss of a ground corner column in a RC frame turns an exterior joint into an inverted knee joint and recent code provisions for exterior joints are not sufficient to knee join
Lat. Am. j. solids struct.. Publicado em: 04/10/2018
-
8. Propagation Model for Path Loss Through Vegetated Environments at 700 – 800 MHz Band
Abstract In almost all literature about propagation models through vegetated environments, path loss has been proposed based on specimens of temperate clime conditions. In this work, a new propagation model is proposed, based on measurements, carried out on vegetated environments with tropical specimens. These environments are common on suburban and rural ar
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-03
-
9. A Hybrid Path Loss Prediction Model based on Artificial Neural Networks using Empirical Models for LTE And LTE-A at 800 MHz and 2600 MHz
Abstract This article presents the analysis of a hybrid, error correction-based, neural network model to predict the path loss for suburban areas at 800 MHz and 2600 MHz, obtained by combining empirical propagation models, ECC-33, Ericsson 9999, Okumura Hata, and 3GPP's TR 36.942, with a feedforward Artificial Neural Network (ANN). The performance of the hyb
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-09
-
10. Heuristics for the optimized deployment of small cells in next-generation networks
Abstract Heterogeneous Networks (HetNets) have been introduced as an alternative means of improving the overall network capacity. However, HetNets increase the complexity and cost of transport due to the large number of smallcells (SCs) that have to be connected, and hence, it is essential to investigate the best way to plan the joint deployment of radio and
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-09
-
11. SFN channel measurements in Brazil
In this paper, field measurements carried out in a suburban SFN network with two synchronized transmitters are reported. It is found that the radio signal coverage of the distributed transmission scheme is distinctly improved when compared to a single transmitter system. The path loss gain and improvement associated to the SFN scheme are obtained as well as
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-06
-
12. MÃtodo para avaliaÃÃo de aspectos de camada fÃsica e MAC de redes 802.11. / Method to evaluate physical and MAC layer aspects of 802.11 networks.
The present dissertation proposes a 802.11 network evaluation sequence which can be adopted, independently of the equipment used at the network. The log-distance path loss model is used for the environment characterization (by the model β parameter) where the network is evaluated. The specific objectives of each evaluation stage are presented and contex
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/12/2012