Results 41 to 50 of about 1,780 (258)

Karl Popper and the Mechanisms of Hydrogen Embrittlement

Advanced Engineering Materials, EarlyView.
Representation of the beginning of loss of ductility rather than embrittlement. Small concentrations of hydrogen in a diffusible form within iron are well‐established to harm the mechanical integrity of steels. There are theories that attempt to explain the pernicious role of hydrogen.
H. K. D. H. Bhadeshia
wiley   +1 more source

La educación superior y la crisis ambiental

RECUS, 2016
En el trabajo se muestra un análisis del impacto ambiental de la especie humana desde su surgimiento, donde se exponen los rasgos fundamentales  de  la  evolución  de  los  impactos  ambientales derivados  de  la actividad  antrópica  hasta  nuestros ...
Antonio Vázquez Pérez, Galo Arturo Perero, María Rodríguez Gámez   +2 more
doaj  

Crisis ambiental – Crisis civilizatoria: el giro ambiental de lo humano en tiempos de crisis civilizatoria

Novos Rumos Sociológicos, 2015
Palestra realizada em 29/10/2013Local: Instituto de Filosofia, Sociologia e Política, Sala 309, 3o andarAna Patricia Noguera de Echeverri,PhD Grupo de Pensamiento Ambiental Universidad Nacional Sede ...
openaire   +2 more sources

Influence of Test Temperature and Test Frequency on Fatigue Life of Aluminum Alloy EN AW‐2618A

Advanced Engineering Materials, EarlyView.
The influence of test temperature and test frequency on the fatigue life of EN AW‐2618A is investigated. High‐cycle fatigue tests are performed at different test temperatures and frequencies on the 1000 h/230°C overaged state. Both test parameters reduce fatigue life due to time‐dependent damage mechanisms.
Ying Han, Julian M. Rosalie, Jan Radners, Mauro Madia, Philipp von Hartrott, Birgit Skrotzki   +5 more
wiley   +1 more source

High‐Temperature Nanoindentation of Metals: Assessing Thermal Drift, Frame Compliance, and Chemical Composition Effects on the Reported Mechanical Properties

Advanced Engineering Materials, EarlyView.
Do not let thermal drift and instrument artifacts deceive high‐temperature nanoindentation results. We compare classical Oliver–Pharr and automatic image recognition analyses across steels and a Ni alloy to quantify these effects. Accounting for artifacts reveals systematic softening with temperature, while Cr and Ni additions boost resistance ...
Velislava Yonkova, Steffen Brinckmann, Ruth Schwaiger   +2 more
wiley   +1 more source

Current Status and Challenges in Data Collection for Aerospace Coatings Deposited by Plasma Spraying

Advanced Engineering Materials, EarlyView.
An innovative approach has been integrated into the GRENAT project to optimize plasma spraying and coating performance. Raw materials are accelerated and melted in the plasma generated by torches, creating coatings. Monitoring sensors collect process data which are combined with ex situ characterization data.
Lila Randriamananjara, Vincent Rat, Quentin Dubreuil, Patrice Valorge, Simon Goutier, Alain Denoirjean, Olivier Messe, Céline Ruelle, Jean‐Philippe Poli   +8 more
wiley   +1 more source

La crisis ambiental y la técnica

Libre Empresa, 2017
La actual crisis ambiental es una consecuencia estructural del capitalismo. El subsistema económico en expansión, desborda las capacidades límites del sistema físico natural como soporte y vertedero. El fondo de tal acontecimiento discurre por la contradicción en la relación hombre y naturaleza.
Jorge Eduardo Lemos de la Cruz, Jorge Alexander Rodríguez Otálora   +1 more
openaire   +2 more sources

Microstructure, Thermal Transport, and Dry‐Sliding Tribology of Powder‐Metallurgy Al7075 Composites Reinforced With Sol–Gel‐Derived ZnO–rGO Hybrid Nanoparticles

Advanced Engineering Materials, EarlyView.
Sol–gel‐derived ZnO–rGO hybrid nanoparticles enable Al7075 powder‐metallurgy composites to achieve concurrent gains in hardness and thermal conductivity while markedly lowering friction and wear. The hybrid architecture couples ZnO‐based load support with rGO‐assisted lamellar sliding and heat spreading, revealing a promising route toward lightweight ...
Bunyamin Aksakal, Cevher Kursat Macit, Merve Ayık, Hakan Tutumlu   +3 more
wiley   +1 more source

Additive Manufacturing of Alumina‐Reinforced Elastomers

Advanced Engineering Materials, EarlyView.
Vat‐photopolymerized elastomers reinforced with platelet‐shaped alumina exhibited preferential orientation, reduced porosity, and significantly enhanced mechanical performance. A 3 wt% platelet loading increased tensile strength from 12.4 to 45.7 MPa, highlighting the critical role of filler morphology in elastomeric VPP composites.
Majid Barzegar Keyvani, Zongwen Fu, Robert Göstl, Hamed Shokri, Carmine Putignano, Gianluca Percoco, Bilal Gökce   +6 more
wiley   +1 more source

Urbanismo y crisis ambiental

, 2021
[Resumen] El texto analiza cómo el crecimiento urbano se ha basado en la idea de que los recursos eran ilimitados, lo que ha llevado a un modelo de desarrollo insostenible. La actual crisis ambiental y energética pone en evidencia los efectos negativos de este modelo, asociado al crecimiento constante del capitalismo y a la explotación de los recursos ...
openaire   +1 more source