Results 81 to 90 of about 2,041,912 (335)
, 2020 In recent years there has been a discussion in various fields, particularly from critical social thinking, about the imminence, origins and scope of the current global multi-crisis and its impacts on the planet, with a central emphasis on the ecological ...
C. López
semanticscholar +1 more source
Electrical Conductivities of Conductors, Semiconductors, and Their Mixtures at Elevated Temperatures
Advanced Engineering Materials, EarlyView.This article presents a comprehensive review of temperature‐dependent electrical conductivity data for multiple material classes at elevated temperatures, highlighting a persistent conductivity gap between metals and semiconductors in the range of 102$\left(10\right)^{2}$– 107$\left(10\right)^{7}$ S/m. Metal–ceramic irregular metamaterials are proposed
Valentina Torres Nieto, Marcia A. Cooper
wiley +1 more source
¿Tiene España la red de carreteras que necesita? [PDF]
, 2013 En los últimos años, nuestro país ha realizado una importante inversión en carreteras y hoy en día cuenta con una de las redes de mayor longitud. No obstante, cabe plantearse si existe un equilibrio territorial en la dotación de infraestructuras, cómo ...
Monzón de Cáceres, Andrés
core +1 more source
Ecojusticia, equidad y ética: retos para la orientación educativa y profesional [PDF]
, 2019 In social and environmental terms we live in precarious and uncertain times, where not only the sustainability of the planet rests in the balance, but also that of human existence.
Irving, Barrie A. +1 more
core +2 more sources
Advanced Engineering Materials, EarlyView.Thermomechanical fatigue tests of laser beam powder bed fusion (PBF‐LB) Inconel 718 show that the additively manufactured material reaches almost the lifetimes of conventionally‐rolled material under no‐dwell conditions. Introducing dwell times at the maximum temperature markedly reduces the lifetimes due to pronounced grain boundary sliding associated
Stefan Guth +6 more
wiley +1 more source
Expresión Económica, 2018 El tema del trabajo que se presenta es la gobernanza ambiental en México . Su objetivo consiste en determinar las regularidades de los impactos de la aplica- ción de los instrumentos de gestión ambiental . La pregunta de investigación que formulamos es:
Salvador Peniche Camps +1 more
doaj +1 more source
Advanced Engineering Materials, EarlyView.Four‐point bending tests are conducted in an argon atmosphere on commercial MgO‐C brick grades with and without MgO‐C recyclate from room temperature up to 1300 °C. No detrimental effect of the MgO‐C recyclates on bending strength is found. Instead, a decisive influence of the total carbon content is observed, with lower total carbon contents ...
Alexander Schramm +5 more
wiley +1 more source
Gestión y Ambiente, 2018 En esta presentación se aborda el divorcio entre Economía y Ecología, las implicaciones de esta separación para entender la crisis ambiental y para la búsqueda de soluciones a dicha crisis.
Erik Gómez-Baggethun
doaj +1 more source
, 2015 El proposito del presente articulo se centra en el reconocimiento de las representaciones sociales de la crisis ambiental, que circulan en un grupo de profesores en formacion inicial de la Licenciatura en Quimica de la Universidad Pedagogica Nacional de ...
Porras Contreras, Y. Alexander
semanticscholar +1 more source
Advanced Engineering Materials, EarlyView.This study investigates thermo‐chemical processes during high‐temperature testing of two commercial MgO‐C brick grades, one containing 47.5 wt.% MgO‐C recyclate. Using ETV, DTA/TG‐MS, XRD, and SEM/EDS/EBSD, mechanisms such as carbothermal reduction of magnesia, impurity incorporation into the secondary MgO surface layer, and calcium‐rich phase ...
Alexander Schramm +6 more
wiley +1 more source