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Pau dos Ferros, Brazil

da Silva F.M.,Campus Universitario | de Andrade A.P.,INSA MCT | Fernandes P.D.,INSA MCT | Costa A.M.B.,IFRN
Revista Caatinga

The objective of this research was to evaluate the behavior of thermal conductivity in the apparent surface in caatinga predominantly cactus, especially eunapolis [Pilosocereus gounellei (A. Weber ex K. Schum.)]. The study area was the river basin Taperoá, located in the region of Cariris Velhos in the State of Paraíba. Data were used for temperature and heat flux on the surface of vegetated soil. It used the law of heat conduction, who modeling time series of apparent thermal conductivity of the vegetation was made by Fourier methods, linear regression and polynomial. The results are partial, but antagonistic to literature, and they point out that the heat transfer by conduction in the caatinga has significance and should provide support for parameterization and incorporation of vegetation dynamics in the models are, hydrological, environmental or atmospheric circulation. Source

Da Costa J.A.,PM RN | Araujo N.,PM RN | Danjour M.F.,IFRN
WMSCI 2012 - The 16th World Multi-Conference on Systemics, Cybernetics and Informatics, Proceedings

This study seeks to identify the organizational culture at the Centre for Development and Improvement of the Military Police of Rio Grande do Norte-Brazil (CFAPM) based on the model of organizational functioning styles of Paz and Mendes. Therefore, this study is considered to be descriptive and is classified as a case study and is predominantly quantitative in nature. It was conducted on 59 police officers working in CFAPM. The study allowed for the identification of the relationship between organizational culture and the socio-demographic subjects studied. The data was processed using statistical techniques applying the Chi-square, Fisher exact Test and Correspondence Analysis. The results indicated the predominance of the affiliative cultural style and from the police investigated a significant relationship between socio-demographic and cultural styles was seen and identified. Its predominance was evident in 55.9% of the police. This predominance was seen in all the general characteristics, showing organisational culture is influenced by these general characteristics. Finally, it is concluded that this study identifies that the cultural style that is predominant in CFAPM, is the affiliative, which has characteristics of standard collectivism, with a developed subculture style. Source

De Paiva F.A.P.,IFRN | Costa J.A.F.,Federal University of Rio Grande do Norte
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

Everyday a huge amount of pages are published on the Web, and, as a consequence, the users' difficulty to locate those that will meet their needs is increasingly bigger. The challenge for web designers and e-commerce companies is to identify groups of users that present similar interests in order to personalize navigation environments to meet those interests. In an attempt to offer that to the countless web users, in the last years, several researches have been done on clustering applied to Web Usage Mining. In this paper, a log file is preprocessed to map the sequence of visits for each user's session. A Session-Path Matrix is used as input to SOM Map and identifying patterns between each session. The results show the similarities between the sessions based on time spent on visited paths and volume transferred. © 2012 Springer-Verlag. Source

Oliveira G.S.,IFRN | da Costa J.M.C.,Federal University of Ceara | Afonso M.R.A.,Federal University of Ceara
Revista Brasileira de Engenharia Agricola e Ambiental

The hygroscopicity of the dehydrated food is related to its physical, chemical and microbiological stability. This study aimed to characterize the physico-chemical and hygroscopic behavior of freeze dried yellow mombin pulp powder with maltodextrin (DE20). Analysis of moisture, pH, soluble solids, titratable acidity, ascorbic acid, sugars, color, hygroscopicity and caking degree were performed. To obtain the isotherm, BET, GAB, Henderson and Oswin models were fitted and evaluated at 25 °C. The addition of maltodextrin to yellow mombin pulp resulted in a powder with a lower hygroscopicity and degree of caking. In addition, the results showed that the addition of maltodextrin provides a powder statistically different (p < 0.05) than the powder without maltodextrin with respect to moisture content, soluble solids, titratable acidity, ascorbic acid, sugars and color. The isotherms of the powders were classified as type III, characteristic of materials rich in carbohydrates. The results showed that the best fit of the isotherms were BET and Henderson models for the yellow mombin pulp powder and the yellow mombin pulp powder with maltodextrin, respectively. © 2014, Departamento de Engenharia Agricola - UFCG/Cnpq. All rights reserved. Source

Teixeira C.S.L.,IFRN | de Medeiros P.G.,Federal University of Rio Grande do Norte | Ho L.L.,University of Sao Paulo

This paper proposes an approach for monitoring the average number of non-conformities per items in short-run productions of N items. After every m produced items, the last r items are inspected. For each inspected item, the number of defects is counted; each inspected item is classified as approved if it meets the control limit criterion. If all r inspected items are approved, then the production goes on, otherwise it is stopped for adjustment. The inspected items are all discarded in case of production stoppage. After a production of N items, an additional lot is produced to complete the size ordered, but this additional lot does suffer inspection. A finite discrete state Markov chain is used to determine the transitory probabilities, which will be considered in terms of cost, to determine the optimal strategy for monitoring, obtained by optimizing three parameters: sampling interval (m), retrospective sample size (r), and control limit (cl). These parameters are obtained computationally by direct search to minimize the expression of the average cost per item produced. A numerical example illustrates the proposal. Source

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