Results 71 to 80 of about 2,284 (265)

Estudios mineros y geológicos de la región del Guavio y de los Farallones de Medina

Boletín Geológico, 1953
En este informe se resumen los estudios que se han efectuado en los municipios de Gachetá, Junín, Ubalá y Gachalá, en la región del Guavio, de los Farallones de Medina, del Alto de Bojará y Alto del Quemado.
Roberto Wokittel, Jaime López Casas
doaj   +1 more source

Experimental Evaluation of 100Cr6 Steel Microindented Surfaces Under Lubricated Nonconformal Point Contacts

Advanced Engineering Materials, EarlyView.
The tribological behavior of 100Cr6 steel spheres textured via Vickers microindentation is evaluated under lubricated sliding by varying both dimple size and density. Fine and dense textures significantly reduce friction across all lubrication regimes, while large dimples increase it.
Farideh Davoodi, Pasquale Guglielmi, Gianfranco Palumbo, Giuseppe Carbone   +3 more
wiley   +1 more source

Electronic Excitations in Metals and at Metal Surfaces

Chemical Reviews, 2006
Peer ...
Chulkov, E.V., Borisov, A.G., Gauyacq, J.P., Sanches-Portal, D., Silkin, V.M., Zhukov, V.P., Echenique, P.M.   +6 more
openaire   +4 more sources

Concentraciones de plomo (Pb) en cultivos de lechuga (Lactuca sativa) en Azuay, Ecuador

Scientia Agropecuaria, 2019
El crecimiento poblacional, la expansión de la ciudad y el aumento del parque automotor del cantón Cuenca ha causado un deterioro en la calidad del aire, lo que pone en riesgo la producción agrícola en las zonas rurales cercanas, el objetivo del presente
Jacinto Vázquez, Cecilia Sangurima, Manuel Alvarez-Vera   +2 more
doaj   +1 more source

Laser Powder Bed Fusion of Alumina: Effects of Scanning Strategies on External and Internal Defects

Advanced Engineering Materials, EarlyView.
This study investigates how scanning strategies affect pure alumina in laser powder bed fusion. Linear 45° scanning yields uniform surfaces but high porosity, while the island‐concentric strategy provides higher density with through‐holes favorable for infiltration. Findings highlight pathways toward optimizing defect‐free alumina parts.
Mohamed Abdelmoula, Gökhan Küçüktürk, Duran Kaya, David Grossin, Christophe Tenailleau, Benjamin Duployer, Enrique Juste, Fabrice Petit   +7 more
wiley   +1 more source

Validación de un método de análisis para la determinación de metales pesados en partículas pM10 colectadas en aire ambiente

Tecnología en Marcha, 2011
Se validó un método de análisis para la determinación del contenido de metales presentes en partículas PM10 colectadas del aire ambiente de la ciudad de San José.
Jorge Herrera-Murillo, Susana Rodríguez-Román   +1 more
doaj  

Carboxylic‐Acid Functionalized Multiwalled Carbon Nanotube‐Alkane‐Based Resistive Temperature Sensor for Cold Chain Applications

Advanced Engineering Materials, EarlyView.
This study presents a reversible temperature sensor with high switching ratio, ∼103. The device is fabricated using PET‐ITO and carbon nanotube dispersions in alkane. Considering its application in cold chain logistics, a proof‐of‐concept with LED is showcased. Thus, a temperature drop below the threshold temperature (crystallization temperature of the
Sunil Kumar Behera, Philippe Marrec, A. Jorge Parola, Madalena Dionísio, Hugo Águas, Andreia F. M. Santos, Hamed Pourkheirollah, Donald Lupo, César A. T. Laia   +8 more
wiley   +1 more source

Primeras casas de Fundición

Historia Mexicana El Colegio de México, 1952
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Román Beltrán Martínez
doaj  

Concentraciones de metales en cabello humano: un estudio exploratorio en Sonora, México

Epistemus
El cabello humano es un material biológico que atrae la atención dado lo sencillo de su muestreo, manejo y transporte, así como en proporcionar información de las concentraciones de algunos elementos traza que pueden, además, servir como indicadores de ...
Daniela Aguilera-Márquez, Jaqueline García-Hernández   +1 more
doaj   +1 more source

Low‐Cost, Large‐Scale Nanoporous Metals by Mechanical Alloying, Oxide Reduction, and Dealloying of Powders

Advanced Engineering Materials, EarlyView.
Powder metal processing provides scalable advantages in nanoporous (np) metal development. Mechanical alloying is used to produce unique precursors for hybrid nanopore formation by oxide reduction and dealloying. As demonstrated in np Ag, this approach improves process efficiency while promoting smaller ligaments and larger pores, both of which are ...
Mark A. Atwater, Oliver A. Fowler
wiley   +1 more source