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Now showing items 131-140 of 3379
Estudo dos fatores de risco associados à evasão de alunos de graduação da Universidade Federal de Santa Maria
(Universidade Federal de Santa Maria, 2018-01-12)
Currently, Higher Education Institutions (HEIs), especially public ones, express great
concern regarding the adequate qualification of their students and assurance of
adequate results in terms of numbers of graduates who ...
Sistema de controle para conversores modulares multiníveis utilizados em conexões HVDC de parques eólicos offshore
(Universidade Federal de Santa Maria, 2018-02-27)
This work presents a brief history of the wind generation system in general and
the detailed history of the offshore wind generation system. Current data on installed
capacity, power of used wind turbines and distance ...
Estimação fasorial para relés de proteção numéricos usando redes neurais artificiais e o algoritmo de Levenberg-Marquardt
(Universidade Federal de Santa Maria, 2018-03-16)
In this work, two methodologies for phasor estimation in numerical protective relays in
Electrical Power Systems will be presented: one based on Artificial Neural Networks, and another
based on the Levenberg-Marquardt ...
Método para detecção de oscilação de potência no domínio do tempo
(Universidade Federal de Santa Maria, 2018-03-09)
This work proposes two techniques for the detection of power swings and blocking of distance
relays on transmission lines to prevent undue shutdowns. If a fault occurs during power swing,
it must be immediately detected ...
Utilização de uma bentonita tratada termicamente como catalisador foto-Fenton para a degradação de corantes em soluções aquosas
(Universidade Federal de Santa Maria, 2018-03-22)
The presence of toxic organic and inorganic compounds in surface waters is one of the major environmental pollution problems. The textile industries generate a large amount of effluents containing organic dyes, such as ...
Sustentabilidade de concretos com misturas binárias de pozolanas e resíduos de demolição de concreto com ênfase na avaliação e custo do ciclo de vida
(Universidade Federal de Santa Maria, 2018-08-28)
With the increasing consumption of natural resources worldwide, great concern about the environment is generated, making sustainability a focus on the quality of life and survival of living beings. In order to reduce these ...
Cadeia de suprimentos: avaliação para seleção de fornecedores verdes em um hospital universitário
(Universidade Federal de Santa Maria, 2018-01-23)
Due to increased consumer awareness and government pressures on environmental issues, organizations are emphasizing the importance of sustainability in supply chain operations through the selection of green suppliers. This ...
Algoritmo para cálculo e compensação da corrente capacitiva aplicado em relés diferenciais para proteção de linhas de ultra alta tensão
(Universidade Federal de Santa Maria, 2017-12-05)
Transmission lines have different characteristics and properties that define their parameters. One of the main components that is included in the modeling is the shunt capacitance. It generates a current that becomes ...
Imunidade contra surtos de tensão em sistemas de iluminação
(Universidade Federal de Santa Maria, 2018-02-28)
This work presents a new point of view about electrolytic capacitor reduction in lighting
systems. While most of studies focus only in the functionality of the driver, as ripple current
and time response they don’t check ...
Sistema de supervisão local/remoto para pequenas centrais de geração elétrica
(Universidade Federal de Santa Maria, 2018-03-23)
Supervisory systems are widely used in power generation systems. They allow
operation analysis by means of a human-machine interface, which acts on the plant. In
addition, supervisory systems can be used to check operating ...