Results 31 to 40 of about 85,807 (168)

Identification and control of occupational risks in a São Paulo metropolitan region quarry [PDF]

, 2009
A mineração de pedra britada é a terceira em movimentação financeira do país, sendo que quase metade da economia desse bem se concentra na região metropolitana de São Paulo. Paralelamente, o setor registrou o maior número de acidentes entre as indústrias
Eston, Sérgio Médici de, Iramina, Wilson Siguemasa, Silva, Leonardo Motta Camargo, Tachibana, Ivan Koh   +3 more
core   +1 more source

Precipitation of niobic acid from potassium niobate in sulphuric acid solution: A route to niobium oxide

The Canadian Journal of Chemical Engineering, EarlyView.
Graphical abstract illustrating the niobic acid precipitation process applied and the product obtained. Abstract This study investigates the precipitation of niobic acid (Nb2O5.nH2O) from potassium niobate solution with addition of sulphuric acid, and its subsequent thermal conversion into niobium oxide (Nb2O5). Thermodynamic modelling with PHREEQC and
Cássia R. Souza, Gabriela C. Silva, Isabel P. Silva, Frederico M. Penha, Sônia D. F. Rocha   +4 more
wiley   +1 more source

Critical Discourse Analysis in Corporate Reports: Legitimation Strategies in the Context of Environmental Controversies

Corporate Social Responsibility and Environmental Management, EarlyView.
ABSTRACT This study examines the use of environmental disclosure as a strategic tool to manage legitimacy crises in a mining company, adopting critical discourse analysis (CDA) as the main methodology. Focusing on a case of environmental disaster, this research reveals how corporate narratives can be manipulated to minimize responsibility and reinforce
Renata Luiza de Castilho Rossoni, Manolita Correia Lima   +1 more
wiley   +1 more source

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

International 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, Sebastião Ribeiro   +1 more
wiley   +1 more source

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

Advanced 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, Xueyu Hu, Yong Ding, Chanho Kim, Yi‐Chen Wu, Taewoo Kim, Meilin Liu   +6 more
wiley   +1 more source

Informantes nativos e os limites do domínio português no Brasil colonial tardio

Fronteiras, 2023
Ao longo de sua história colonial, grande parte do território escassamente povoado da América portuguesa não foi completamente colonizado, principalmente a província de indígenas autônomos e semiautônomos.
Hal Langfur
doaj   +1 more source

Mineração de dados climáticos para previsão de geada e deficiência hídrica para as culturas do café e da cana-de-açúcar para o Estado de São Paulo. [PDF]

, 2011
Introdução. Mineração de dados. O Estado de São Paulo e o agronegócio. Café e cana-de-açucar. Geada x café. Deficiência hídrica x café x. Cana-de-açúcar. Previsão meteorológica. Metodologia. Resultados esperados.bitstream/CNPTIA/9945/1/doc20.pdfAcesso em:
BUCENE, L. C., MEIRA, C. A. A., RODRIGUES, L. H. A.   +2 more
core   +1 more source

Understanding the Role of Nb Doping in Modulating Ionic Diffusion Kinetics and Particle Size in Spinel LiMn2O4

Battery Energy, Volume 5, Issue 1, January 2026.
Niobium (Nb) incorporation into spinel LiMn2O4 achieves simultaneous enhancement of ionic diffusion kinetics and particle size. After Nb doping, the overall surface energy decreases, promoting particle growth. Despite the increased particle size, the introduction of niobium significantly improves the rate capability and effectively mitigates ...
Junda Li, Xiaoxia Yang, Jiayong Chen, Guanjie Yan, Bo Wang, Ruimin Qin, Chunliu Li, Yaqiong Su, Zhongzhu Liu, Luanna Silveira Parreira, Robson S. Monteiro, Laijun Liu, Leidang Zhou, Weibo Hua   +13 more
wiley   +1 more source

Proposta de utilização de mineração de textos para seleção, classificação e qualificação de documentos. [PDF]

, 2011
Introduçaõ. Revisão de literatura. proposta de aplicação da Agência. Hipóteses. Resultados esperados.
MOURA, M. F.
core  

Niobium‐Based Surface Engineering Enables High Rate and Cycling Stability of High‐Voltage LiNi0.5Mn1.5O4 Cathode

ChemElectroChem, Volume 13, Issue 2, January 2026.
A scalable sol–gel‐assisted strategy is developed to construct a uniform niobium‐based surface coating on high‐voltage LiNi0.5Mn1.5O4 (LNMO) cathodes. The conformal Nb‐rich layer acts as a chemically robust and ionically conductive interphase that suppresses electrolyte oxidation, mitigates Ni/Mn dissolution, and stabilizes the cathode‐electrolyte ...
Jiaqi Ke, Jordan Gatts, Yuan Tan, Boyu Wang, Robson Monteiro, Prayag Biswal, Laisuo Su   +6 more
wiley   +1 more source