Sökning: "Seshadri Seetharaman"

Visar resultat 1 - 5 av 25 avhandlingar innehållade orden Seshadri Seetharaman.

1. 1. Experimental Studies of Thermal Diffusivities concerning some Industrially Important Systems

   Författare :Riad Abdul Abas; Seshadri Seetharaman; Rainer Wunderlich; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; laser flash; thermal diffusivity; heat conduction; phonon; electron contribution; crystallisation degree; graphitisation; Metallurgical process engineering; Metallurgisk processteknik;

   Sammanfattning : The main objective of this industrially important work was to gain an increasing understanding of the properties of some industrially important materials such as CMSX-4 nickel base super alloy, 90Ti.6Al.4V alloy, 25Cr:6Ni stainless steel, 0. LÄS MER

3. 2. Investigations of the Kinetics of Reduction and Reduction/Carburization of NiO-WO3 Precursors

   Författare :Hesham M. Ahmed; Seshadri Seetharaman; Ricardo Morales Estrella; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Reduction; Reduction-Carburization; Gas-solid Reactions; Kinetics; Hydrogen; Methane; Thermogravimetric analysis; Fluidized bed; Simulation; Thermal diffusivity; Thermal conductivity; Laser flash; Metallurgical process engineering; Metallurgisk processteknik; Process Metallurgy;

   Sammanfattning : Kinetic studies of reduction of the mixtures of NiO and WO3 having different Ni/(Ni+W) molar ratios in flowing hydrogen gas were investigated by means of Thermo Gravimetric Analysis (TGA), Fluidized Bed (FB) technique as well as Thermal diffusivity measurements under isothermal conditions. In the case of TGA, the reaction progress was monitored by mass loss, while evolved gas analysis by a gas chromatograph was the indicator of the reaction progress in the case of FB. LÄS MER

4. 3. Abatement of Chromium Emissions from Steelmaking Slags - Cr Stabilization by Phase Separation

   Författare :Galina Albertsson; Lidong Teng; Seshadri Seetharaman; Voicu Brabie; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; spinel; slag basicity; oxygen partial pressure; chromium oxide vaporization; шпинель; шлак; парциальное давление кислорода; испарение оксидa хрома; 尖晶石; 炉渣碱度; 氧分压; 铬氧化物汽化; spinell; slaggbasicitet; syrepartialtryck; förångning av kromoxid;

   Sammanfattning : Chromium is an important alloying element in stainless steel but also environmentally harmful element. A number of mineralogical phases present in the slag matrix can contain chromium and lead to chromium leaching. LÄS MER

5. 4. Studies on dephosphorisation during steelmaking

   Författare :Somnath Basu; Seshadri Seetharaman; Nobuo Sano; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Metallurgical process engineering; Metallurgisk processteknik;

   Sammanfattning : This work is aimed at understanding the thermodynamic principles influencing the phosphorus partition between slag and steel during steelmaking, particularly during refining of high-phosphorus hot metal using the basic oxygen steelmaking (BOS) process. Mapping of the slag path has been carried out using a mass balance model based on input conditions and off-gas analysis, which has been validated by intermediate measurements of slag and metal composition in an industrial basic oxygen furnace (BOF). LÄS MER

7. 5. Adsorption of surface active elements on the iron (100) surface : A study based on ab initio calculations

   Författare :Weimin Cao; Seshadri Seetharaman; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; sulfur; oxygen; surface adsorption; iron surface; ab initio calculations; adsorption energy; work function; difference charge density; thermodynamic stability; average velocity; Materials science; Teknisk materialvetenskap;

   Sammanfattning : In the present work, the structural, electronic properties, thermodynamic stability and adatom surface movements of oxygen and sulfur adsorption on the Fe surface were studied based on the ab initio method. Firstly, the oxygen adsorbed on the iron (100) surface is investigated at the three adsorption sites top, bridge and hollow sites, respectively. LÄS MER