Results 71 to 80 of about 1,462,174 (364)

Accidentes fuera del trabajo: análisis en el campamento minero de Toquepala 2002-2003

Revista Médica Herediana, 2005
En general, todas las empresas desarrollan programas para evitar o minimizar los accidentes del trabajo. Sin embargo, existe escasa información técnica relacionado a la prevalencia y costos derivados de los accidentes fuera del trabajo, lo que dificulta ...
Raúl Gomero Cuadra, Carlos Llap Yesan, Livia Calizaya De la Sota, Ramón Silvera Vallejos   +3 more
doaj  

Highly selective plasma-activated copper catalysts for carbon dioxide reduction to ethylene

Nature Communications, 2016
There is an urgent need to develop technologies that use renewable energy to convert waste products such as carbon dioxide into hydrocarbon fuels. Carbon dioxide can be electrochemically reduced to hydrocarbons over copper catalysts, although higher ...
H. Mistry, A. Varela, C. Bonifacio, I. Zegkinoglou, I. Sinev, Yong-Wook Choi, K. Kisslinger, E. Stach, Judith C. Yang, P. Strasser, B. Cuenya   +10 more
semanticscholar   +1 more source

Copper Dyshomeostasis in Neurodegenerative Diseases—Therapeutic Implications

International Journal of Molecular Sciences, 2020
Copper is one of the most abundant basic transition metals in the human body. It takes part in oxygen metabolism, collagen synthesis, and skin pigmentation, maintaining the integrity of blood vessels, as well as in iron homeostasis, antioxidant defense ...
G. Gromadzka, B. Tarnacka, A. Flaga, A. Adamczyk   +3 more
semanticscholar   +1 more source

Non‐Destructive and Mechanical Characterization of the Bond Quality of Co‐Extruded Titanium‐Aluminum Profiles

Advanced Engineering Materials, EarlyView.
This study investigates the bond quality of co‐extruded aluminum–titanium hybrid profiles, focusing on the lateral angular co‐extrusion (LACE) process. It examines how heat treatments (HT) affect intermetallic phase formation, bond strength, and material properties.
Norman Mohnfeld, Ahmed Dewidar, Karim Qarbi, Hendrik Wester, Florian Patrick Schäfke, Alexej Verschinin, Hans Jürgen Maier, Sebastian Barton, Christian Klose, Johanna Uhe   +9 more
wiley   +1 more source

El trabajo a turnos como factor de riesgo para lumbago en un grupo de trabajadores peruanos.

Revista Médica Herediana, 2005
Objetivo: Identificar la asociación entre trabajo a turnos y lumbago en un grupo de trabajadores mineros. Materiales y métodos: Estudio Caso Control realizado el año 2003 en un grupo de trabajadores mineros. Se revisaron las historias electrónicas de los
Juan Carlos Palomino Baldeon, Fermín Ruíz Gutierrez, Gian Navarro Chumbes, Félix Dongo Lazo, Carlos Llap Yesan, Raúl Gomero Cuadra   +5 more
doaj  

Paleozoic multi-stage magmatism in the Yuka terrane, North Qaidam orogenic belt: mantle modification, tectonic evolution, and geodynamic processes

Frontiers in Earth Science
The detailed study of HP/UHP metamorphic rocks and intermediate-acid rocks has revealed the complete tectonic evolution of the North Qaidam Orogenic Belt (NQOB), from oceanic to continental subduction and subsequent exhumation.
Yibin Lin, Chengtao Yu, Shuyuan Chen, Sudong Shi, Sangjiancuo Luo, Junaid Khan   +5 more
doaj   +1 more source

ED SUM: Triple-negative breast cancer is inhibited by depleting mitochondrial copper in mice.

Nature Biotechnology, 2020
Depletion of mitochondrial copper, which shifts metabolism from respiration to glycolysis and reduces energy production, is known to be effective against cancer types that depend on oxidative phosphorylation.
L. Cui, A. Gouw, Edward L LaGory, Shenghao Guo, Nabeel Attarwala, Yao Tang, Ji Qi, Yun-Sheng Chen, Zhou Gao, Kerriann M. Casey, Arkadiy A. Bazhin, Min Chen, Leeann Hu, Jinghang Xie, Ming Fang, Cissy Zhang, Qihua Zhu, Zhiyuan Wang, A. Giaccia, S. Gambhir, Weiping Zhu, D. Felsher, M. Pegram, E. Goun, A. Le, J. Rao   +25 more
semanticscholar   +1 more source

Comparative Wear and Friction Analysis of Sliding Surface Materials for Hydrostatic Bearing under Oil Supply Failure Conditions

Advanced Engineering Materials, EarlyView.
Hydrostatic bearings excel in high‐precision applications, but their performance hinges on a continuous external supply. This study evaluates various material combinations for sliding surfaces to mitigate damage during supply failures or misalignment and to discover the most effective materials identified for enhancing the reliability and efficiency of
Michal Michalec, Lukáš Daněk, Jan Foltýn, Petr Svoboda, Carsten Gachot, Martin Hartl, Ivan Křupka   +6 more
wiley   +1 more source

Wheat straws-derived hierarchical porous carbon as electrode material for supercapacitor

Discover Electronics
Hierarchical porous carbon materials hold great potential in electrochemical energy storage, yet their efficient fabrication still faces numerous challenges. Herein, we successfully prepared hierarchical porous carbon materials with high specific surface
Zhenjuan Zang, Xiaolong Zhang, Baoshan Xia, Kelong Cao, Jinfeng Li, Qingguo Chen   +5 more
doaj   +1 more source

A Different Perspective on the Solid Lubrication Performance of Black Phosphorous: Friend or Foe?

Advanced Engineering Materials, EarlyView.
Researchers investigate black phosphorous (BP) as a standalone solid lubricant coating through ball‐on‐disc linear‐reciprocating sliding experiments in dry conditions. Testing on different metals shows BP doesn't universally reduce friction and wear. However, it achieves 33% friction reduction on rougher iron surfaces and 23% wear reduction on aluminum.
Matteo Vezzelli, Manel Rodríguez Ripoll, Sabine Schwarz, Ali Erdemir, Maria Clelia Righi, Carsten Gachot   +5 more
wiley   +1 more source