domingo, 1 de outubro de 2017

Viability of Biofertilizer Produced by an Indian Biodigester Prototype Applied to Sunflower Plants


Biodigesters have been used to convert biomass into biogas and biofertilizers. This energy use has been important for the reduction of solid waste pollution in the environment. This work aims to analyse the viability of the use of pig biofertilizer produced by an Indian biodigester prototype, monitored by a data acquisition system. The biodigester used was an Indian prototype built on a low cost material that is easy to acquire (polyvinyl chloride-PVC). After the biofertilizer production, we tested its efficiency and viability under conditions of vegetation house in the cultivation of sunflower plants. The experimental design was completely randomized in a factorial arrangement with 4 concentrations of biofertilizer (0, 40, 80 and 120 kg N ha-1) × 4 harvest periods (14, 21, 25 and 29 days after sowing). We evaluated biometric and vigor parameters by measurements of stem diameter, height of the aerial part, number of leaves and production of fresh and dry matter of roots, aerial and total parts, as well as the relative chlorophyll content. We performed the experiment with five repetitions using two plants each and we submitted the data to analysis of variance (ANOVA) and polynomial regression using the statistical software Sisvar 5.4. The functional Indian biodigester prototype produced a biofertilizer of excellent quality and viability as a biofertilizer for the initial growth of sunflower plants. The biofertilizer served as a nutritional source in the sunflower crop, since it provided increases in all the growth parameters analyzed in relation to the control group (plants in the absence of biofertilizer), especially in the concentration of 120 kg N ha-1.    


http://www.ccsenet.org/journal/index.php/jas/article/view/69361


Development of a Low-Cost Data Acquisition System for Biodigester

The objective of this work is to develop a low-cost data acquisition system, which aims to optimize the anaerobic biodigestion process in an Indian model biodigester prototype, by monitoring the main parameters of the process. In this development, we decided to create a system from scratch, including the entire measure-process-show procedure using hardware tools and free software as means of reducing costs. This platform must be capable of obtaining analog data from the sensors arranged in the biodigester in long periods for the creation of more accurate reports. The system must be able to send this information to a Web server, so these values can be continuously tracked anywhere with access to the internet. The monitoring must be done in a hybrid application for Android, iOS and web browser.

Keywords:

Acquisition System, Biodigestor, Monitoring

http://www.scirp.org/journal/PaperInformation.aspx?PaperID=79000&#abstract

domingo, 12 de março de 2017

Controladores Utilizando Lógica Fuzzy

O presente trabalho apresenta uma biblioteca de Lógica Fuzzy para implementar o controle em sistemas não-lineares, onde, posteriormente, será utilizada em microcontroladores/microprocessadores para executar diversas formas de controle. A Lógica Fuzzy é utilizada, pois oferece uma maior facilidade de trabalho em sistemas de controle, em que nem sempre é possível realizar uma simples modelagem matemática do processo.

Autor Principal: Antonio Carlos Barros

Mais informações em:
http://ojs.unifor.br/index.php/tec/article/download/76/75

Avaliação Computacional da Influência da Temperatura na Potência de um Painel Fotovoltaico (Computational Evaluation of the Influence of Temperature on the Power of a Photovoltaic Panel)

Indira Ponte Ribeiro, Francisco Frederico dos Santos Matos, Auzuir Ripardo Alexandria

        Este trabalho apresenta a análise da influência da temperatura na eficiência de um painel solar, sob condições de irradiação constante. As geometrias usadas na simulação foram criadas no software ICEM, usando dimensões reais de um painel solar, que foram então processadas no software ANSYS CFX. O objetivo deste trabalho é avaliar o percentual de perda de potência causado pelo aumento da temperatura. Simulou-se a temperatura na interface do painel em dois casos distintos: com e sem a presença de circulação de ar. Os resultados mostram uma redução gradual do percentual de perda de potência, em função da diminuição da temperatura do painel, conforme se resfria a interface entre os domínios. Ao se comparar o percentual de perda de potência das simulações que apresentaram a maior e a menor temperatura no painel, obteve-se uma redução de 75 % da queda de potência.

      This work presents the influence of temperature on the efficiency of a solar panel under conditions of constant irradiation. The geometries used in simulation were created in the software ICEM, using the real dimensions of a photovoltaic panel, which were in turn processed in the software ANSYS CFX. The objective of this study is to evaluate the power loss percentage caused by the increase in temperature. The temperature was simulated in the panel interface for two different cases: with and without the presence of air circulation. The results show a gradual reduction of power loss percentage, due to the decrease the temperature of the panel, as the boundary interface cools down. When comparing the power loss percentage of the simulations that showed the highest and the lowest temperature in the panel, it was obtained a 75% reduction of power loss.





Link para o artigo completo

segunda-feira, 12 de dezembro de 2016

SISTEMA DE DETERMINAÇÃO DE COORDENADAS CARTESIANAS BASEADO EM VISÃO ESTÉREO ( 75/5000 SYSTEM OF DETERMINATION OF CARTESIAN COORDINATES BASED ON STEREO VISION)


Guilherme Costa Holanda, Jéssyca Almeida Bessa, Renan Bessa, Francisco Alan Xavier da Mota, Ajalmar Rego da Rocha Neto, Auzuir Ripardo Alexandria

Resumo


Os métodos de determinação de coordenadas cartesianas são muito importantes no mapeamento de objetos em um ambiente. Devido a essa importância, estes métodos geram bastante interesse por parte de pesquisadores da área de Visão Computacional. Assim, neste trabalho será abordado um desses métodos, que é baseado em visão estéreo. Como as câmeras são sensores passivos, os métodos de medição de dimensões por visão estéreo se destacam, pois podem fornecer, além das coordenadas, muitas outras informações, por exemplo, grau de iluminação, cores, identificação e reconhecimento de objetos. Baseado nesta vantagem, o objetivo deste trabalho, portanto, é desenvolver um sistema de determinação de coordenadas cartesianas baseado em visão estéreo. Para esta finalidade, uma câmera Minoru3D foi utilizada. A estrutura do equipamento inclui duas câmeras em uma só. Além disso, um mapa artesanal foi confeccionado para testar o sistema implementado e um objeto de faces retangulares foi utilizado nos testes de determinação de coordenadas. Este objeto de teste foi disposto em algumas posições no mapa e foi feito uma comparação entre as coordenadas do mapa e do sistema estéreo. Os testes do sistema apresentaram resultado satisfatório com erro quadrático médio de 0,58. Sendo assim, o sistema estéreo implementado foi capaz de disponibilizar coordenadas confiáveis do objeto nas posições dispostas.

The available methods applied to determine Cartesian coordinates are very important in the mapping of objects in an environment. Due to this importance, these methods generate enough interest from researchers at the Computer Vision area. In this work will be discussed one such method, which is based on stereo vision. In this work will be discussed one such method, which is based on stereo vision. As the cameras are passive sensors, measurement methods for stereo vision stand out, because they can provide, in addition to the coordinates, many other information, such as illumination, colors, object identification and recognition. Based on this advantage, the aim of this study therefore is to develop a determination of Cartesian coordinates based on stereo vision system. This work aims to develop a system to determine the Cartesian coordinates based on stereo vision. For this purpose, a Minoru3D camera was used. The structure of the equipment includes two cameras in one. Furthermore a handmade map was made to test the implemented system and an object of rectangular faces was used in order to determine the coordinate tests. The test object was placed at some positions on the map and a comparison was made between the map coordinates and stereo system. The system tests showed satisfactory results with mean square error of 0.58. Therefore, the implemented stereo system was able to provide reliable object coordinates in the arranged positions.



Link para o artigo completo

sábado, 30 de janeiro de 2016

Inserting Photovoltaic Solar Energy to an Automated Irrigation System

Photovoltaic solar energy has been gaining market share over the years due to lower prices and to a significant incentive from the government. It is a clean, static and promising energy source, and such technology has been applied to various applications. This paper presents a prototype of an automated irrigation system for later installation on the field. After the prototype development, we analyzed the use of a previously built photovoltaic microgeneration, in order to insert the electricity generated in the automated irrigation system. The photovoltaic microgeneration has an installed capacity of 2.76 kWp and a battery bank with 24 V. The integration of photovoltaic solar energy in the automated irrigation system represented a good application for family farming, minimizing water waste, besides representing the use of a renewable energy source.
 
http://www.ijcaonline.org/research/volume134/number1/reges-2016-ijca-907751.pdf