Electrical Systems
Mostrando 1-12 de 484 artigos, teses e dissertações.
-
1. Electromagnetic Transients in Multiconductor Transmission Lines
Abstract The theory of multiconductor transmission lines is based on the principle of superposition. According to this principle, any electric or magnetic field can be represented as the sum of individual electric or magnetic fields. This theory is used to analyze and design electrical systems involving multiple conductors. In this work, the procedures for a
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
-
2. TECHNICAL AND ECONOMIC FEASIBILITY OF USING A VARIABLE-FREQUENCY DRIVE IN MICRO-IRRIGATION SYSTEMS
ABSTRACT Irrigation is essential for the development of crops in regions with scarcity or irregular rainfall distribution, enabling high productivity. However, the use of water resources and electrical energy leads to a concern with irrigation efficiency. Pressure demand varies during the operations of irrigation systems and the appropriate pressure can be r
Eng. Agríc.. Publicado em: 2021-02
-
3. Characterization of Sobradinho landslide in fluvial valley using MASW and ERT methods
Abstract Landslides can substantially impact the fluvial systems, which is why the continuous mapping of their extent, evolution and stability assessment is crucial. However, in such environments, material identification (e.g. colluvium) and subsurface characterization by the methods used for geologic mapping and geotechnical investigation is often a challen
REM, Int. Eng. J.. Publicado em: 2020-12
-
4. HYDROPONIC CULTIVATION OF CORIANDER USING FRESH AND BRACKISH WATERS WITH DIFFERENT TEMPERATURES OF THE NUTRIENT SOLUTION
ABSTRACT A large number of studies on salinity in hydroponic systems have been carried out, but few of them have evaluated the interaction between salinity and nutrient solution temperatures. Two experiments were carried out in a randomized block design from January to February (Experiment I) and June to July 2018 (Experiment II). Experiment I consisted of t
Eng. Agríc.. Publicado em: 2020-12
-
5. ELECTRICAL NOISES REDUCTION IN NANOPORES EXPERIMENTS BASED ON CONSENSUS FILTER
Nanopore has developed into an indispensable tool for single molecules experiments, where useful information about the characteristics of DNA/RNA can be obtained from the flowing of ionic current elicited by individual molecules as they traverse a single nanometer-scale aperture. However, due to the relatively high background current noise and low measuremen
Quím. Nova. Publicado em: 20/07/2020
-
6. INCREASED ENERGY COGENERATION IN THE SUGAR-ENERGY SECTOR WITH THE USE OF SUGARCANE STRAW, ELECTRIFICATION OF DRIVES, AND HIGH-DRAINAGE ROLLERS IN THE EXTRACTION
ABSTRACT The sugar-energy sector stands out in the production of electrical energy in the Brazilian energy matrix. The updating of Law 9,427 allowed increasing the limit of power injected in the transmission or distribution systems of existing projects from 30 to 50 MW, encouraging studies of expansion and/or implementation of new cogeneration projects. This
Eng. Agríc.. Publicado em: 2020-04
-
7. HYBRID SYSTEM SIMULATION TO SUPPLY HEATED AIR TO A SOLAR FOOD DRYER
ABSTRACT The intermittence of solar radiation, due to continuous rainy or cloudy days, is a limitation of simple and small solar dryers. These conditions often make them impossible to use. By including storage systems (thermal accumulation) and/or auxiliary energy sources, drying processes or dehydration can be conducted continuously, even during periods of
Eng. Agríc.. Publicado em: 2020-04
-
8. Performance Analysis of Small Grid Connected Photovoltaic Systems
Abstract The acceptance and deployment of electric power from sustainable sources, which are less polluting than fossils, have been a consensus throughout society. Specially, the growth of the installed capacity in photovoltaic energy has been considerable in distributed generation. In order to properly take advantage of this growing demand, it is necessary
Braz. arch. biol. technol.. Publicado em: 25/11/2019
-
9. Photovoltaic Cell Temperature Estimation for a Grid-Connect Photovoltaic Systems in Curitiba
Abstract The photovoltaic solar energy has been growing in installed capacity worldwide year by year, and Brazil has also been investing in this renewable source of energy generation. The conversion of light into electrical energy occurs in the photovoltaic cells, which are sensitive to the increase of the temperature. A considerable amount of the energy in
Braz. arch. biol. technol.. Publicado em: 25/11/2019
-
10. Technical and economic viability of the installation of a hybrid solar-wind generation system in a Brazilian industry
Abstract The demand for electricity is growing worldwide. At the same time, the non-renewable natural resources that account for a large proportion of the global energy matrix are rapidly depleting, which will pose a major challenge in the near future. Therefore, micro-grid models that use renewable energy sources, such as solar and wind, are rapidly develo
Braz. arch. biol. technol.. Publicado em: 25/11/2019
-
11. Avaliação dos sistemas metroviários nas emissões de CO2: análise comparativa das emissões por automóveis, ônibus e metrôs
RESUMO O setor de transportes é responsável por uma parcela das emissões globais de dióxido de carbono (CO2). Os estudos científicos publicados sobre emissões de CO2 pelos sistemas de transportes de passageiros tratam basicamente de resultados envolvendo apenas as emissões relacionadas ao consumo dos combustíveis dos automóveis e ônibus. Nos metrô
Eng. Sanit. Ambient.. Publicado em: 25/11/2019
-
12. Single-Bus and Dual-Bus Architectures of Electrical Power Systems for Small Spacecraft
ABSTRACT Nowadays, it has become possible for universities and new businesses to launch satellites of reduced size and cost fulfilling viable missions. Nevertheless, there is still a considerable failure rate that reduces the expected lifetime of these spacecraft. One of the main causes of failure is the power system. Redundancy is one of the main options to
J. Aerosp. Technol. Manag.. Publicado em: 10/10/2019