Browsing Τμήμα Μηχανικών Μηχανολογίας και Κατασκευαστικής / Department of Mechanical and Manufacturing Engineering by Title

Now showing items 916-935 of 1036

    • Article  

      Thermal oxidation and facet-formation mechanisms of Si nanowires 

      Kioseoglou, J.; Komninou, P.; Zervos, Matthew (2014)
      Silicon nanowires were grown along the [111] direction on Si(001) by the vapor-liquid-solid mechanism using 1 nm Au as a catalyst. They were subsequently oxidized at 900 °C for 60 min, 120 min and 180 min, which lead to ...
    • Conference Object  

      Thermal, electron transport and far infrared properties of PbTe single crystals doped with Br 

      Nikolic, M. V.; Paraskevopoulos, K. M.; Hatzikraniotis, E.; Nikolic, N.; Vujatovic, S. S.; Aleksic, O. S.; Zorba, T. T.; Kyratsi, Theodora; Menicanin, A.; Nikolic, P. M. (Affiliation: Institute for Multidisciplinary Research, Kneza Viseslava 1, 11000 Beograd, SerbiaAffiliation: Physics Department, Solid State Section, Aristotle University of Thessaloniki, 54214 Thessaloniki, GreeceAffiliation: Institute of Technical Sciences of SASA, Knez Mihailova 35, 11000 Beograd, SerbiaAffiliation: Department of Mechanical and Manufacturing Engineering, University of Cyprus, 1678 Nicosia, CyprusCorrespondence Address: Nikolic, M.V.Institute for Multidisciplinary Research, Kneza Viseslava 1, 11000 Beograd, Serbia, 2012)
      Understanding the properties of PbTe remains in focus as enhancement of thermoelectric efficiency of this material is studied extensively. In this work single crystals of PbTe, doped with less than 2 at % Br, were synthesized ...
    • Conference Object  

      Thermo-fluid modeling of direct chill casting of metal alloys using an inverse finite element method 

      Alexandrou, Andreas N.; Battisti, T. (Publ by Computational Mechanics Inc, 1992)
      Direct chill (DC) casting is used extensively in the production of wrought nonferrous metals and alloys, particularly in the aluminum industry. For alloys, a semi-solid region known as the “mushy zone” and defined by the ...
    • Article  

      Thermoeconomic modeling and exergy analysis of a decentralized liquefied natural gas-fueled combined-cooling-heating-and-power plant 

      Arsalis, A.; Alexandrou, Andreas N. (2014)
      A small-scale combined-cooling-heating-and-power (CCHP) plant is proposed as a possible alternative to large-scale, centralized, electricity-only power plants. The proposed system is based on a non-ideal gas turbine (Brayton) ...
    • Article  

      Thermoeconomic modeling and parametric study of a photovoltaic-assisted 1 MWe combined cooling, heating, and power system 

      Arsalis, A.; Alexandrou, Andreas N.; Georghiou, George E. (2016)
    • Article  

      Thermoeconomic modeling of a small-scale gas turbine-photovoltaic-electrolyzer combined-cooling-heating-and-power system for distributed energy applications 

      Arsalis, A.; Alexandrou, Andreas N.; Georghiou, George E. (2018)
      The purpose of this study is to investigate the potential of a small-scale, combined-cooling-heating-and-power system, consisting of a 1 MWe gas turbine subsystem coupled to a 0.5 MWe photovoltaic (PV) subsystem for ...
    • Conference Object  

      Thermoelectric materials and applications on the recovery of waste heat energy 

      Kyratsi, Theodora (Affiliation: Department of Mechanical and Manufacturing Engineering, University of Cyprus, 1678, Nicosia, CyprusCorrespondence Address: Kyratsi, T.Department of Mechanical and Manufacturing Engineering, University of Cyprus, 1678, Nicosia, Cyprus, 2010)
      Today, thermoelectric (TE) technology offers a solution regarding large amounts of energy that are lost as waste heat from various applications. In this paper, the need for better thermoelectric materials is addressed and ...
    • Article  

      Thermoelectric module for low temperature applications 

      Lal, S.; Loo, S.; Chung, D. Y.; Kyratsi, Theodora; Kanatzidis, M. G.; Cauchy, C.; Hogan, T. P. (2002)
      The possibility of a prototype thermoelectric cooling device for operation near liquid nitrogen temperatures has been explored. In these devices, the figure of merit involves a combination of the properties of the two ...
    • Article  

      Thermoelectric properties and site-selective Rb+/K+ distribution in the K2-xRbxBi8Se13 series 

      Kyratsi, Theodora; Chung, D. Y.; Ireland, J. R.; Kannewurf, C. R.; Kanatzidis, M. G. (2003)
      β-K2Bi8Se13 possesses promising thermoelectric properties whereas Rb2Bi8Se13 does not. The formation of solid solutions between these two compounds was attempted to study the alkali metal distribution in the structure and ...
    • Article  

      Thermoelectric Properties of Bi-Doped Mg2Si0.6Sn0.4 Solid Solutions Synthesized by Two-Step Low Temperature Reaction Combined with Hot Pressing 

      Polymeris, George S.; Vlachos, Nikolaos; Symeou, Elli; Kyratsi, Theodora (2018)
      The goal of this study is to investigate the influence of the amount of Bi doping on the microstructure and thermoelectric properties of the Mg2Si0.60Sn0.4 material studied by X-ray diffraction, scanning electron microscopy, ...
    • Article  

      Thermoelectric properties of Bi0.5Sb1.5Te3 thin films grown by pulsed laser deposition 

      Symeou, E.; Pervolaraki, M.; Mihailescu, C. N.; Athanasopoulos, G. I.; Papageorgiou, C.; Kyratsi, Theodora; Giapintzakis, John (2015)
      We report on the pulsed laser deposition of p-type Bi0.5Sb1.5Te3 thin films onto fused silica substrates by ablation of dense targets of Bi0.5Sb1.5Te3 with an excess of 1 wt% Te. We investigated the effect of film thickness, ...
    • Article  

      Thermoelectric properties of highly efficient Bi-doped Mg2Si1−x−ySnxGey materials 

      Khan, A. U.; Vlachos, N. V.; Hatzikraniotis, E.; Polymeris, G. S.; Lioutas, Ch B.; Stefanaki, E. C.; Paraskevopoulos, K. M.; Giapintzakis, John; Kyratsi, Theodora (2014)
      In this work, Bi-doped Mg2Si1−x−ySnxGey (x=0.4 and y=0.05) solid solutions with the nominal Bi content of 0⩽z⩽0.035 were synthesized by solid state synthesis and sintering via hot pressing, and were studied in terms of ...
    • Article  

      Thermoelectric properties of hot-pressed β-K2Bi 8Se13-x Sx materials 

      Kyratsi, Theodora; Ioannou, M. (2013)
      In this work, hot-pressed pellets of the K2Bi8Se 13 family of compounds were prepared for the first time. The pellet fabrication of selected members of the K2Bi8Se 13-x Sx series was studied. Sintering parameters, such as ...
    • Conference Object  

      Thermoelectric properties of K 2Bi 8Se 13-xS x solid solutions 

      Kyratsi, Theodora; Lal, S.; Hogan, T.; Kanatzidis, M. G. (Affiliation: Department of Chemistry, Michigan State University, East Lansing, MI 48824, United StatesAffiliation: Department of Mechanical and Manufacturing Engineering, School of Engineering, University of Cyprus, Nicosia, CyprusAffiliation: Department of Electrical and Computer Engineering, Michigan State University, East Lansing, MI 48824, United StatesCorrespondence Address: Kyratsi, T.Department of Chemistry, Michigan State University, East Lansing, MI 48824, United States, 2006)
      Derivatives of β-K 2Bi 8Se 13 are an interesting series of materials for thermoelectric investigations due to their very low thermal conductivity and highly anisotropic electrical properties. Up to now substitutions on the ...
    • Conference Object  

      Thermoelectric properties of K2Bi8-xSbxSe13 solid solutions and Se doping 

      Kyratsi, Theodora; Dyck, J. S.; Chen, W.; Chung, D. Y.; Uher, C.; Paraskevopoulos, K. M.; Kanatzidis, M. G. (Affiliation: Department of Chemistry, Michigan State University, East Lansing, MI 48824, United StatesCorrespondence Address: Kyratsi, T.Department of Chemistry, Michigan State University, East Lansing, MI 48824, United States, 2002)
      Our efforts to improve the thermoelectric properties of β-K2Bi8Se13, led to systematic studies of solid solutions of the type β-K2Bi8-xSbxSe13. The charge transport properties and thermal conductivities were studied for ...
    • Article  

      Thermoelectric properties of LaNi1-xCoxO3 solid solution 

      Migiakis, P.; Androulakis, J.; Giapintzakis, John (2003)
      The thermoelectric properties of the selected members of the LaNi 1-xCoxO3 solid solution were investigated. The electrical properties of the solution investigated were determined from the doping level. The substitution ...
    • Article  

      Thermoelectric properties of Mg2Si coatings deposited by pack cementation assisted process on heavily doped Si substrates 

      Stathokostopoulos, D.; Stefanaki, E. C.; Ioannou, M.; Polymeris, G. S.; Chaliampalias, D.; Pavlidou, E.; Kyratsi, Theodora; Paraskevopoulos, K. M.; Vourlias, G.; Hatzikraniotis, E. (2014)
      This work presents a study of structural and thermoelectric properties of Mg2Si coatings deposited on heavily doped p- and n-type Si substrates, at 650 C. The as-grown layers were smooth and uniform in thickness without ...
    • Article  

      Thermoelectric properties of nanocrystalline PbTe synthesized by mechanical alloying 

      Papageorgiou, Ch; Hatzikraniotis, E.; Lioutas, Ch B.; Frangis, N.; Valassiades, O.; Paraskevopoulos, K. M.; Kyratsi, Theodora (2010)
      In this work, nanocrystalline lead telluride powder was synthesized from high-purity elements by mechanical alloying by means of a planetary ball-milling procedure. The milling medium was tungsten carbide, and the diameter ...
    • Conference Object  

      Thermoelectric properties of pressed pellets and pressureless sintering in the K2Bi8Se13-xSx system 

      Tsiappos, A.; Kyratsi, Theodora; Kanatzidis, M. G. (Affiliation: Department of Mechanical and Manufacturing Engineering, School of Engineering, University of Cyprus, Nicosia, CyprusAffiliation: Department of Chemistry, Michigan State University, East Lansing, MI 48824, United StatesCorrespondence Address: Tsiappos, A.Department of Mechanical and Manufacturing Engineering, School of Engineering, University of Cyprus, Nicosia, Cyprus, 2006)
      The solid solutions of ß-K2Bi8Se13 are an interesting series of materials for thermoelectric investigations because they possess very low thermal conductivity and relatively high power factor. Moreover, the sulfur-substituted ...
    • Article  

      Thermoelectric properties of strained, lightly-doped La1–x­SrxCoO3 thin films 

      Viskadourakis, Z.; Pervolaraki, M.; Athanasopoulos, G. I.; Giapintzakis, John (2019)
      We report on the thermoelectric properties of strained, highly-oriented, lightly-doped La1–xSrxCoO3 thin films, grown on MgO (100) substrates by pulsed laser deposition. The large lattice mismatch (∼9%), along with the ...