Zobrazeno 1 - 10
of 44
pro vyhledávání: '"Julio Cezar de Oliveira Freitas"'
Autor:
Fawzi Chamssine, Luiz H. S. Gasparotto, Miguel Angelo Fonsecade Souza, Mahmoud Khalifeh, Julio Cezar de Oliveira Freitas
Publikováno v:
Scientific Reports, Vol 12, Iss 1, Pp 1-9 (2022)
Abstract Geopolymers are the most promising alternative to Ordinary Portland Cement for oil-well cementing and well abandonment. To that end, the slurry needs a required pumping time ensured by the addition of retarders. Although zinc has been widely
Externí odkaz:
https://doaj.org/article/55d91cbd1901433d93f86a7716e4690c
Autor:
Renata Martins Braga, Najara Maira Teodoro, Dulce Maria de Araujo Melo, Flávia de Medeiros Aquino, Joana Maria de Farias Barros, Julio Cezar de Oliveira Freitas
Publikováno v:
Holos, Vol 5, Iss 0, Pp 40-49 (2013)
As peneiras moleculares MCM-41 têm atraído grande interesse devido as suas propriedades de alta área específica, volume e diâmetro de poros controláveis. Estes materiais são aplicados em diversos ramos da indústria química como adsorventes,
Externí odkaz:
https://doaj.org/article/919136796c9b47baa2ac9cc1c2af601f
Autor:
Renata Martins Braga, Marcus Antônio de Freitas Melo, Dulce Maria de Araújo Melo, Akwasi A. Boateng, Julio Cezar de Oliveira Freitas
Publikováno v:
Journal of Thermal Analysis and Calorimetry. 147:6655-6663
Elephant grass (Pennisetum purpureum Schum.) is one such resource with a great amount of carbohydrate and lignin polymers that together represent high volatile content of biomass suitable for conversion into bio-oil by fast pyrolysis. However, the hi
Autor:
Laís Sibaldo Ribeiro, Valdic Luiz da Silva, Luciene Santos de Carvalho, Marcos Allyson Felipe Rodrigues, Alcides de Oliveira Wanderley Neto, Julio Cezar de Oliveira Freitas, Daniel Nobre Nunes da Silva
Publikováno v:
Journal of Petroleum Exploration and Production Technology, Vol 10, Iss 7, Pp 2845-2856 (2020)
After drilling oil wells using oil-based drilling fluid, there is the occurrence of a formation of a thin layer of solids adsorbed on the surface, called filter cake, which must be removed to obtain satisfactory well cementation. The present work dev
Autor:
Roxana Pereira Fernandes De Sousa, Glauco Soares Braga, Alfredo Ismael Curbelo Garnica, Fabíola Dias da Silva Curbelo, Elayne Andrade Araújo, Julio Cezar de Oliveira Freitas
Publikováno v:
Holos, Vol 2, Iss 0, Pp 1-12 (2020)
HOLOS; v. 2 (2020); 1-12
Holos
Instituto Federal do Rio Grande do Norte (IFRN)
instacron:IFRN
HOLOS; v. 2 (2020); 1-12
Holos
Instituto Federal do Rio Grande do Norte (IFRN)
instacron:IFRN
Os fluidos de perfuração microemulsionados são uma nova tecnologia que objetiva substituir os fluidos base óleo e base água, por possuir alta lubricidade, estabilidade, baixa toxicidade, baixo custo e menor perda de fluido. Assim, este trabalho
Autor:
Glauco Soares Braga, Fabíola Dias da Silva Curbelo, Raphael R. Silva, Alfredo Ismael Curbelo Garnica, Roxana Pereira Fernandes De Sousa, Giovanna Lais Rodrigues Leal, Vivian S. Madera, Julio Cezar de Oliveira Freitas
Publikováno v:
Energies, Vol 14, Iss 7981, p 7981 (2021)
Energies; Volume 14; Issue 23; Pages: 7981
Energies; Volume 14; Issue 23; Pages: 7981
This work has developed and evaluated a microemulsion-based drilling fluid formulation with characteristics to be applied in oil wells. The microemulsion was formulated with a solution of water/glycerol, pine oil, and Tween 80, a nonionic and biodegr
Autor:
Dennys S.S. Pereira, F.R.S. Silvestre, Petrucia D.S. Meireles, Renata Martins Braga, Julio Cezar de Oliveira Freitas, Marcus Antônio de Freitas Melo, Dulce Maria de Araújo Melo
Publikováno v:
Journal of Cleaner Production. 220:1215-1221
The oil industry has been drilling wells since the last century using Portland cement as a cementing basic material. There are several environmental impacts associated with the Portland cement production from the raw materials extraction to the macro
Autor:
Julio Cezar de Oliveira Freitas, Irantécio Mendonça Ferreira, Antonio Eduardo Martinelli, Ulisses Targino Bezerra, Luanna Carla Matias Paiva
Publikováno v:
Repositório Institucional da UFRN
Universidade Federal do Rio Grande do Norte (UFRN)
instacron:UFRN
Universidade Federal do Rio Grande do Norte (UFRN)
instacron:UFRN
The dispersion of short fibers to oil well Portland slurries may improve the compressive strength and fracture energy of the hardened cementing material. A study was carried out to investigate the effect of the addition of ball-milled basalt fibers (
Autor:
André H. de Oliveira, Fabrício G. Menezes, Jordan K. da Silva, Miguel A. F. de Souza, Rodrigo Cristiano, Welisson P. Silva, Julio Cezar de Oliveira Freitas
Publikováno v:
Journal of Molecular Structure. 1180:399-405
Self-assembly-based molecular structures have proven to be highly relevant to the development of soft materials. This work reports the synthesis, thermal behavior and computational analysis of two novel heterocyclic compounds with a non-symmetrical s
Autor:
Janduir Egito da Silva, Guilherme Quintela Calixto, Renata Martins Braga, Marcus Antônio de Freitas Melo, Julio Cezar de Oliveira Freitas, Cássia Carvalho de Almeida, Dulce Maria de Araújo Melo
Publikováno v:
Journal of Thermal Analysis and Calorimetry. 137:1635-1643
The use of agricultural wastes for energy conversion has been widely studied as renewable and carbon neutral energy sources. This paper aims to evaluate the energetic potential of six agricultural wastes—sugarcane bagasse, bean pods, corn stover, p