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Browsing by Subject "Concentration (process)"

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    • Article  

      Alpha radiometry of uranium in surface and ground waters by liquid scintillation counting after separation of the radionuclide by cation exchange 

      Antoniou, Stella; Tsiaili, A.; Pashalidis, Ioannis (2008)
      The alpha radioactivity of surface and ground water samples has been determined by liquid scintillation counting (LSC) after chemical preparation of the samples by cation exchange using the Chelex 100 resin. The method ...

    • Article  

      Assessing the accuracy of wall concentration estimation based on averaged permeate velocity in spacer-filled Reverse Osmosis (RO) membrane systems 

      Ma, S.; Kassinos, Stavros C.; Fatta-Kassinos, Despo (2006)
      The accuracy of estimations of wall concentration using the constant (averaged) permeate velocity method was assessed in both empty and spacer-filled reverse osmosis (RO) channels under various operation conditions, based ...

    • Article  

      Assessing the accuracy of wall concentration estimation based on averaged permeate velocity in spacer-filled Reverse Osmosis (RO) membrane systems 

      Ma, S.; Kassinos, Stavros C.; Fatta-Kassinos, Despo (2006)
      The accuracy of estimations of wall concentration using the constant (averaged) permeate velocity method was assessed in both empty and spacer-filled reverse osmosis (RO) channels under various operation conditions, based ...

    • Article  

      Boron adsorption on alumina (Al2O3) and magnesia (MgO) in aqueous solutions: A comparative study 

      Konstantinou, M.; Kasseta, G.; Pashalidis, Ioannis (2006)
      The adsorption of boron on alumina (Al2O3) and magnesia (MgO) has been investigated in aqueous solutions as a function of pH, boron concentration, amount of adsorbent, ionic strength and temperature. Analysis of the ...

    • Article  

      Determination of Erbium Distribution in Optical Fibers Using Confocal Optical Microscopy 

      Uttamchandani, D.; Othonos, Andreas S.; Hubert, M. (1994)
      Confocal fluorescence microscopy has been used to detect the 565 nm wavelength fluorescence generated from Er+3 ions present in erbium doped optical fibers, thereby enabling the concentration profile of these ions in the ...

    • Article  

      Direct observation of excitons in polymer/carbon nanotube composites at room temperature: The influence of nanotube concentration 

      Lioudakis, Emmanouil E.; Kanari, C.; Othonos, Andreas S.; Alexandrou, Ioannis (2008)
      In this work, we have employed spectroscopic ellipsometry technique to study the optical properties of polymer/carbon nanotube (CN) composites as a function of nanotube concentration. Using a two-layer structural model ...

    • Conference Object  

      Dynamic responses in polymer-clay gels 

      Loizou, Elena; Porcar, L.; Butler, P.; Malwitz, M.; Schmidt, G. (2005)
      The shear orientation of three polymer-clay gels has been investigated by means of small angle neutron scattering (SANS). The gels have the same polymer and clay concentrations but different polymer molecular weight. The ...

    • Article  

      Effects of Ge concentration, boron co-doping, and hydrogenation on fiber bragg grating characteristics 

      Konstantaki, M.; Tamiolakis, Q.; Argyris, A.; Othonos, Andreas S.; Ikiades, A. (2005)
      In this paper, we compare photosensitivity, refractive-index modulation depth, spectral bandwidth, and excess loss through the inscription of fiber Bragg gratings in unloaded and hydrogen-loaded fibers with low- or ...

    • Article  

      Industrial NOx control via H2-SCR on a novel supported-Pt nanocatalyst 

      Olympiou, G. G.; Efstathiou, Angelos M. (2011)
      We describe here the performance of a novel MgO-CeO2-supported Pt nanocatalyst (∼1.5nm mean Pt particle size) towards the selective conversion of NO (XNO>90%) into N2 (SN2>80%) using H2 (H2-SCR) in the low-temperature range ...

    • Article  

      Low-temperature purification of gas streams from phenol by steam reforming over novel supported-Rh catalysts 

      Constantinou, D. A.; Efstathiou, Angelos M. (2010)
      The purification of gas streams from phenol at low-temperatures (350-550 °C) was investigated by its reaction with steam over novel catalytic systems, namely 0.5 wt% Rh supported on Ce0.15Zr0.85O2, Ce0.15Zr0.83Mg0.02O2 and ...

    • Article  

      Mechanistic aspects of the water-gas shift reaction on alumina-supported noble metal catalysts: In situ DRIFTS and SSITKA-mass spectrometry studies 

      Olympiou, G. G.; Kalamaras, Christos M.; Zeinalipour-Yazdi, Constantinos D.; Efstathiou, Angelos M. (2007)
      Steady-state isotopic transient kinetic analysis (SSITKA) experiments coupled with mass spectrometry were performed for the first time to study essential mechanistic aspects of the water-gas shift (WGS) reaction over ...

    • Article  

      The phenol steam reforming reaction towards H2 production on natural calcite 

      Constantinou, D. A.; Fierro, José Luis García; Efstathiou, Angelos M. (2009)
      The steam reforming of phenol towards H2 production was studied in the 650-800 °C range over a natural pre-calcined (air, 850 °C) calcite material. The effects of reaction temperature, water, hydrogen, and carbon dioxide ...

    • Article  

      Reactivation of an aged commercial three-way catalyst by oxalic and citric acid washing 

      Christou, Stavroula Y.; Birgersson, H.; Fierro, José Luis García; Efstathiou, Angelos M. (2006)
      The efficiency of dilute oxalic and citric acid solutions on improving the oxygen storage capacity (OSC) and catalytic activity of a severely aged (83 000 km) commercial three-way catalyst (TWC) has been investigated. ...

    • Article  

      A study of volatile organic compounds evolved in urban waste disposal bins 

      Statheropoulos, Miltiades K.; Agapiou, Agapios; Pallis, George C. (2005)
      Volatile organic compounds (VOCs) evolved in urban waste disposal bins in different situations were studied. Waste of various loads (full, empty, partially filled bins), remained uncollected in the containers for variable ...

    • Article  

      Synthesis and aqueous solution characterization of catalytically active homopolymers, block copolymers and networks containing imidazole 

      Patrickios, Costas S.; Simmons, M. R. (2000)
      Imidazole-containing polymers were prepared and characterized in terms of their hydrolytic activity. Unlike similar materials synthesized in the 1960s, the polymers are of precise molecular weight and controlled structure ...

    • Conference Object  

      Synthetic polyampholytes for protein partitioning in two-phase aqueous polymer systems 

      Patrickios, Costas S.; Abbott, Nicholas L.; Foss, Robert P.; Hatton, T. Alan (Publ by AIChE, 1992)
      The equilibrium phase behavior of aqueous systems composed of poly(vinyl alcohol), a synthetic acrylic random polyampholyte (acrylic acid:dimethylaminoethyl methacrylate:methyl methacrylate = 0.9:1:1) and added salts was ...

    • Article  

      Ultrafast dynamics of localized and delocalized polaron transitions in P3HT/PCBM blend materials: The effects of PCBM concentration 

      Lioudakis, Emmanouil E.; Alexandrou, Ioannis; Othonos, Andreas S. (2009)
      Nowadays, organic solar cells have the interest of engineers for manufacturing flexible and low cost devices. The considerable progress of this nanotechnology area presents the possibility of investigating new effects from ...

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