Results 81 to 90 of about 6,618 (292)

Trabajadores y técnicas mineras andinas en las fiebres del oro del mundo en el siglo XIX

Nuevo mundo - Mundos Nuevos, 2015
During the XIX century, the alluvial gold findings in the United Sates, Australia, New Zealand and other territories, attracted numerous adventurers, including South American immigrants with knowledge in mining tasks.
Inés Herrera Canales
doaj   +1 more source

Dynamic Testing of Cold Gas Sprayed Bipolar Plates–Porous Transport Layer Coating System in Proton Exchange Membrane Water Electrolysis

Advanced Engineering Materials, EarlyView.
Through direct application of porous transport layer (PTL) on the bipolar plate (BPP) with thermal spraying, the interfacial contact resistance is improved. With the cold gas sprayed BPP–PTL coating system, a proton exchange membrane water electrolysis cell with a cell voltage of Ucell = 1.9 V can be operated up to i = 2.5 A/cm2 in a dynamic mode ...
Kirsten Bobzin, Marvin Erck, Kevin Jasutyn, Katja Radermacher, Andreas Bund, Mario Kurniawan   +5 more
wiley   +1 more source

The Effects of Surface Disturbances on the Leaching of Heavy Metals [PDF]

, 1987
The harmful effects of heavy metal contamination of surface waters impacted by gold mining activity are well documented. An examination was conducted on the effects of surface disturbances in Wade Creek on the concentrations of heavy metals in ...
Brown, Edward J., Dixson, David P.
core  

Copper Nanocrystallization in Anodic Oxide Films of Ti–Cu‐Based Bulk Metallic Glass and Its Effect on the Corrosion Resistance and Cytocompatibility

Advanced Engineering Materials, EarlyView.
Viktoriia Shtefan, Thorgund Nemec, Ute Hempel, Annett Gebert and coworkers demonstrate that anodic treatment of Ti–Cu‐based metallic glass in a nontoxic pyrophosphate electrolyte forms a protective bilayered Ti/Zr‐oxide film enriched with Cu nanocrystals.
Viktoriia Shtefan, Nora Fernández Navas, Thorgund Nemec, Ivan Kaban, Ute Hempel, Andrea Voss, Volker Hoffmann, Darius Pohl, Annett Gebert   +8 more
wiley   +1 more source

Multiscale (microscopic to remote sensing) preliminary exploration of auriferous-uraniferous marbles: A case study from the Egyptian Nubian Shield. [PDF]

Sci Rep, 2023
Shebl A, Hamdy M.
europepmc   +1 more source

Birch Hill Park: A Case Study of Interpretive Planning [PDF]

, 1979
The Fairbanks North Star Borough Parks and Recreation Department is responsible for the planning, acquisition, development, improvement, and maintenance of lands and facilities to meet the community's needs for park and open space lands in ...
Combs, David
core  

Direct Metal Deposition of Graphene–Ti28Nb35.4Zr Matrix Composites With Enhanced Mechanical, Corrosion, and Biocompatibility Properties for Bone Implants

Advanced Engineering Materials, EarlyView.
Graphene nanoplatelet (0.1 wt.%) reinforcement significantly enhances the performance of β Ti‐28Nb‐35.4Zr alloy. Grain refinement, reduced water contact angle, and improved surface characteristics promote osteoblast adhesion and complete surface coverage after 7 days.
Khurram Munir, Jixing Lin, Yuncang Li, Li Zhu, Paul F. A. Wright, Cuie Wen   +5 more
wiley   +1 more source

User-centered design of central venous access device documentation. [PDF]

JAMIA Open, 2022
Kandaswamy S, Gill A, Wood S, Mckay L, Hike J, Popkin M, Ray E, Maude H, Johnston C, White T, Orenstein E.   +10 more
europepmc   +1 more source

Copper mineral occurrences in the Wrangell Mountains-Prince William Sound area, Alaska [PDF]

, 1971
On January 9, 1970, the U.S. Bureau of Mines entered into an agreement with the University of Alaska based upon a proposal submitted by the Mineral Industry Research Laboratory.
Grybeck, D.G., Heiner, L.E., Wolff, E.N.
core  

Gold and Greater Britain: Jevons, Trollope, and Settler Colonialism [PDF]

, 2016
The Australian gold rushes of the 1850s provide an exemplary test case for exploring the impact of Greater Britain—the settler colonial empire—on the Victorian novel and political economy.
Philip Steer
core   +1 more source