Essays about: "effect of copper"

Showing result 21 - 25 of 79 essays containing the words effect of copper.

1. 21. Temperature effect on insert tool life in dry machining

   University essay from Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

   Author : William Hagberg; [2021]
   Keywords : Milling tool; Temperature; Wear; Simulation; Cooling; Heat sink; Insert;

   Abstract : This thesis work researched the temperature effects the insert tool life. This was examined through physical laboratory testing with designed milling tools and temperature simulations in ANSYS. The designed milling tools altered the temperature in the insert through external parameters like design and material. READ MORE

3. 22. Measurements of resistivity in transformer insulation liquids

   University essay from Uppsala universitet/Institutionen för elektroteknik

   Author : Jonathan Hägerbrand; [2020]
   Keywords : transformer oil; resistivity; ions; ion drift model; HVDC; contact resistance;

   Abstract : This thesis focuses on measuring techniques and results of resistivity in four commercially available insulating transformer oils: mineral oil, ester oil and two isoparaffin oils. Two measuring techniques, the industrially used diagnostic system for electrical insulation IDA and the Labview implemented Triangular Method, are used for resistivity measurements and the techniques are compared, a correction algorithm to the triangular method is suggested. READ MORE

4. 23. Effect of iron redox state on crystallization behaviour of Fayalite slags

   University essay from KTH/Materialvetenskap

   Author : Paolo Mai; [2020]
   Keywords : Copper smelting; Slag; Magnesium Oxide; Iron redox equilibria; Optical basicity; Raman spectroscopy.; Smältning av koppar; Slagg; Magnesiumoxid; Järnredoxjämvikt; Optisk basicitet; Ramanspektroskopi.;

   Abstract : In the copper smelting processes, the viscosity of the matte and the slag is an important factor for establishing efficiency. Impurities in the concentrates affect the viscosity not only by changing the melt structure but also by promoting precipitation of solid phase which sharply rises it. READ MORE

5. 24. Chemical Stabilization of Arsenic in Contaminated Soil under Low Redox Conditions

   University essay from Luleå tekniska universitet/Institutionen för samhällsbyggnad och naturresurser

   Author : Eva Smedborn Pausson; [2019]
   Keywords : ;

   Abstract : Remediation techniques for arsenic contaminated soil have previously focused mostly on the surface soil layers where aerobic conditions are prevalent. In this master thesis, chemical stabilization by adding zero-valent iron (Fe(0)) and calcium oxide (CaO) to an arsenic-contaminated soil under low redox conditions have been studied through up-flow percolation tests. READ MORE

6. 25. Commodity Price Boom and Copper mines in Chile: The assessment of local spillover effects on the labor market.

   University essay from Lunds universitet/Ekonomisk-historiska institutionen

   Author : Silvia Navarro Berdeal; [2019]
   Keywords : Commodity price boom; labour multipliers; natural resources; gender disparities; women labour markets.; Social Sciences;

   Abstract : Chile has been benefited from a commodity boom in the copper industry during the first decade of the 21st century. Does a mineral boom increase local labour opportunities? Can women get benefit from a resource boom? Can the mineral boom have indirect effects in non-mining sectors? The present paper attempts to explore and measure the impact of an exogenous increase in copper global prices between 2003 and 2011, on Chilean labor market, with a particular focus on gender disparities. READ MORE