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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 34 for “"silver-copper"”.
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Aging phenomena in silver-copper alloys
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Metallurgy, 1936.
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Diffusion of Silver, Copper, Cobalt and Iron in Germanium
Made available in DSpace on 2014-12-04T21:03:06Z (GMT). No. of bitstreams: 1 5900598.pdf: 2868790 bytes, checksum: 6588764d2df235a2d2574297da918b7e (MD5) Previous issue date: 1958
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Trimetallic gold silver copper nanorods for carbon dioxide reduction
… modification would be replacing gold salts with copper salts. The formation of the rodlike shape was assisted by the presence of Ag ions with greater amounts of Ag forming higher aspect ratio nanorods, and their longitudinal localized surface plasmon resonance peaks (LSPR) were measured with a …
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The mechanism of corrosion of cadmium-silver-copper bearing alloys
… determine the mechanism of corrosion of Cadmium-Silver-Copper bearing metals, and if possible to develop a procedure to quantitatively rate oils and inhibitors with respect to corrosion. Two pieces of testing apparatus were employed - a jet-type oil bath and a glass apparatus. It was found that …
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The resistivity recovery of dilute alloys of silver, copper, and gold, proton irradiated at 80°K
… to first or second order. The recovery of the silver and copper alloys showed remarkable similarity to pure silver and copper, but the gold alloy's recovery was markedly altered as compared to pure gold. Activation energies for the stage III defect in silver, copper and gold were found to be …
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A Burn Ratio That Predicts the Relative Extent of Combustion in Metallic Materials.
… work measures the severity of combustion using silver, copper-nickel, tin babbitt, carbon steel and aluminum. The thermodynamic burn ratio is the ratio between the heat released during oxidation and the heat required to melt or vaporize the material.
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Investigation of Mechanical and Antibacterial Performance of Novel Polyaniline (PANI) Coatings via PLD
… ultrathin titanium (Ti) interlayers and silver–copper (Ag–Cu) composite top coatings were introduced to form hybrid organic inorganic structures with improved mechanical durability and surface functionality. The PANI coatings were chemically synthesized and heat-treated at 350 °F for …
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An electrochemical reduction process for the recovery of copper powder from a refinery effluent stream
… from hydrochlorination contains predominantly silver, copper, nickel and iron. This off-gas undergoes a quench-scrub to condense the base metal chlorides. The quench-scrub liquor undergoes a dechlorination process with sulfuric acid to precipitate AgCl(s). The filtrate from this process then …
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Critical heat flux enhancement via surface modification using colloidal dispersions of nanoparticles (Nanofluids)
… include chemically stable metals (e.g., gold, silver, copper), metal oxides (e.g., alumina, zirconia, silica, titania) and carbon in various forms (e.g., diamond, graphite, carbon nanotubes). The attractive properties of nanofluids include higher thermal conductivity, heat transfer coefficients …
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Characterization of Arsenic Hosting Phases in Subaqueous Tailings at Terra Mine, Northwest Territories, Canada
… of operations at Terra Mine, an abandoned silver-copper mine in the Northwest Territories, an estimated 500,000 tons of tailings containing 540,000kg of arsenic (As) were deposited into Ho-Hum Lake. Arsenic is being released from the tailings to the overlying surface water, resulting in …
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Green synthesis, characterization and laser irradiation of silver nanoparticles and its bimetallic nanoparticles
… methods. The current study aimed to manipulate silver nanoparticles (Ag NPs) synthesized in Murraya koenigii leaf extract to fabricate nanostructure by using diode laser irradiation. The green synthesized silver nanoparticles (Gre-Ag NPs) used as reducing and stabilizing agent to synthesize …
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Flex Cracking and Temperature-Humidity-Bias Effects on Reliability of Multilayer Ceramic Capacitors
… flexible termination system which incorporates a silver-loaded epoxy in end-terminations was developed by some MLCC manufacturers. With the transition to lead-free materials in the electronics industry there is a concern that MLCCs assembled on PCBs with lead-free solder have different …
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Bayesian regional models of gold and copper alloys from pre-Hispanic Colombia
… metallurgical technologies. Alloys of gold, silver, copper, and platinum were used in the creation of a wide range of artefacts intended for personal ornamentation, ceremonial use, funerary goods, functional tools, and votive offerings. While our understanding of the region’s societies has …
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3D Printable Lithium Ion Batteries and the Effect of Aspect Ratio of CuAg Nanowires on Graphite Anode Performance.
… we investigated the effect of aspect ratio of silver-copper core-shell nanowires on the performance enhancement of a commercially fabricated graphite lithium ion anodes. Currently, carbon is the most common conductive filler used in commercial lithium ion battery anodes. We hypothesize that a …
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Electroforming and electron emission in metal-borosilicate glass-metal structures
… electrodes in comparison to those carry silver, copper or gold electrodes. Breakdown depends on both the electrode and insulating materials and on the insulator thickness. Since the circulating current in borosilicate films which carry noble metal electrodes such as Ag or Au, is much …
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Numerical study of nanofluid-based direct absorber solar collector systems with metallic/carbon nanoparticles, multiple geometries and multi-mode heat transfer
… (water-based with metallic nanoparticles such as silver, copper, gold, zinc, titanium etc or carbon based e.g. diamond, graphite etc). Viscous incompressible laminar flows using Newtonian fluid models (Navier-Stokes equations) with thermal convection and radiative heat transfer are considered both …
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Effects of micro- and nano-structure on the deformation response of a Ag60Cu40 lamellar and rod-in-matrix eutectic alloy
… work investigates the mechanical response of the silver-copper eutectic system (Ag60Cu40, subscripts indicating atomic percent) linking material deformation to microstructural properties. The Ag60Cu40 material system can be produced as either a multidirectional lamellar or unidirectional …
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Modelling of the reliability of flip chip lead-free solder joints at high-temperature excursions
… operations of electronic control devices, Tin-Silver-Copper (SnAgCu) alloy solder joints used to assemble the component of the devices are functioning at homologous temperature above 0.8. In such ambient temperatures, solder alloys have limited mechanical strength and will be sensitive to …
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The influence of mine waste contamination on invertebrates and fish in the Methow River Valley, Okanogan County, Washington (U.S.A.)
… Ore deposits in the area were mined for gold, silver, copper and zinc until the early 1950's, but the mines are now inactive. The trace elements arsenic (As), cadmium (Cd), copper (Cu), lead (Pb), and zinc (Zn) were the focus of this study.The objectives of this study were to determine, (1) the …
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