Results 41 to 50 of about 87,152 (166)

DOENÇAS OCUPACIONAIS EM PROFISSIONAIS DE UM POLO GESSEIRO: ESTUDO TRANSVERSAL

open access: yesCogitare Enfermagem, 2022
Objetivo: conhecer as doenças e sintomas ocupacionais prevalentes dos trabalhadores de um polo gesseiro. Método: trata-se de uma pesquisa de corte transversal, realizada com 67 trabalhadores de uma indústria de gesso na cidade de Grajaú, Maranhão, Brasil.
Amanda de Sousa Fernandes   +5 more
doaj   +1 more source

Effect of MnO2–TiO2 and Nb2O5 on the Fabrication and Properties of Alumina Ceramics Produced via Vat Photopolymerization

open access: yesJournal of the American Ceramic Society, Volume 109, Issue 5, May 2026.
ABSTRACT Additive manufacturing of ceramics allows the production of complex, small‐batch parts. Among available methods, digital light processing (DLP) offers high‐resolution results with excellent surface finish. LCD‐based DLP printers are cost‐effective due to simpler optics, though they require suspensions with high solid content (> 40 vol%) and ...
J. R. Verza, I. L. Camargo, A. P. Luz
wiley   +1 more source

PROJETO MINAS-RIO NO ENTORNO DO MONUMENTO NATURAL SERRA DA FERRUGEM

open access: yesCadernos de Estudos Sociais, 2020
O texto trata de conflito entre a política conservacionista e a dinâmica desenvolvimentista no Município de Conceição do Mato Dentro, a partir da análise do contexto de avanço da mineração nos limites de uma unidade de conservação, que por sua vez ...
Thaís Henriques Dias   +1 more
doaj   +1 more source

Incorporation of Coconut Fibers Into Clay‐Based Mortars: A Study on Mechanical and Microscopic Behavior

open access: yesInternational Journal of Ceramic Engineering &Science, Volume 8, Issue 2, March 2026.
Clay‐based mortar reinforced with coconut fibers showed improved flexural strength and promising mechanical performance, despite shrinkage‐induced cracks. The study highlights the potential of using waste and natural fibers in eco‐efficient mortars, emphasizing the importance of curing and moisture control.
Gabriela Machado Guimarães Ferreira   +1 more
wiley   +1 more source

Life cycle assessment of three scenarios of cahrcoal production in the eastern amazon [PDF]

open access: yes, 2011
The Amazon forest is well known for its wealth of resources. There is a great abundance of iron ore and wood. This situation has promoted the development of pig iron industries based on charcoal for their thermal processes.
Caldeira-Pires, Armando   +2 more
core  

Borehole Logging Lithological Classification in Carbonatite‐Hosted Niobium Deposit Integrating Geophysical and Geochemical Data With Self‐Organizing Maps

open access: yesGeophysical Prospecting, Volume 74, Issue 3, March 2026.
ABSTRACT Lithological classification from borehole data remains challenging in geologically complex alkaline–carbonatite systems, where compositional overlap and gradual transitions between lithotypes limit conventional interpretation methods. This study presents an integrated and automated workflow for drill‐core lithological classification using self‐
Fabrizzio R. Costa   +6 more
wiley   +1 more source

A Simple Real-Time Method for Detecting Low Performance in Wet High-Intensity Magnetic Separators (WHIMSs) Due to Coil Malfunction

open access: yesInventions
Wet High-Intensity Magnetic Separators (WHIMSs) have become well established in mineral processing operations by efficiently separating particles based on their magnetic properties.
Ricardo B. Ventura   +2 more
doaj   +1 more source

Mineração e desastres ambientais com rejeitos de bauxita e caulim no município de Barcarena-Pará-Brasil-Amazônia

open access: yesTerritorium: Revista Portuguesa de riscos, prevenção e segurança, 2020
O propósito deste trabalho é analisar os principais desastres ambientais ocorridos no município de Barcarena, estado do Pará, Amazônia Brasileira, ocorridos na atividade de beneficiamento de bauxita e caulim no período compreendido entre os anos de 2003 ...
Marcos Antonio de Queiroz Lemos   +1 more
doaj   +1 more source

MINERAÇÃO EM TERRAS INDÍGENAS, DIREITOS HUMANOS E O SISTEMA INTERAMERICANO DE DIREITOS HUMANOS

open access: yesRevista Direitos Culturais, 2009
A mineração ilegal em terras indígenas ocorre porque o Estado a ignora ou se mantém omisso em produzir mecanismos jurídicos eficazes de proteção dos direitos indígenas. Este tipo de atividade ocasiona muitos problemas às comunidades indígenas.
Carlos Frederico Marés de Souza Filho   +1 more
doaj   +1 more source

Synergistic Effects of Entropy Tuning in Niobium‐Based Oxide Anode for Fast‐Charging Lithium‐Ion Batteries

open access: yesAdvanced Functional Materials, Volume 36, Issue 5, 15 January 2026.
An entropy‐tuned niobium‐based oxide (ETNO) anode for fast‐charging lithium‐ion batteries are presented, engineered via multi‐cation doping. The synergistic effects of entropy tuning result in excellent rate capability and long‐term durability under ultrafast charging conditions.
Yoojin Ahn   +6 more
wiley   +1 more source

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