Browsing by Subject "Engineering, Environmental"
Now showing items 21-40 of 41
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Hexavalent chromium release from lignite fly ash and related ecotoxic effects
(2013)Hexavalent chromium Cr(VI) is a pollutant of immense concern due to its high mobility to water sources and highly toxic properties. In most cases, Cr(VI) could be released from lignite fly ash in aquatic environment when ... -
Hydrogen production by ethanol steam reforming over a commercial Pd/-gamma-Al2O3 catalyst
(2004)In the present work the reaction of biomass-derived ethanol steam reforming for hydrogen rich gas streams production, over a commercial alumina supported palladium catalyst was investigated. In particular, the dependence ... -
Impact of building design and occupancy on office comfort and energy performance in different climates
(2014)The building sector has a significant share in a county's total greenhouse gas emissions, and as a reaction to the Kyoto commitment most countries are constantly adjusting building energy requirements in order to reduce ... -
Impact of climate change on comfort and energy performance in offices
(2012)This paper investigates the impact of a climate change scenario on comfort and energy performance in offices, in relation to the influence of building design and occupants. It focuses on a typical cellular office room in ... -
Influence of ozonation on the in vitro mutagenic and toxic potential of secondary effluents
(2008)Reclamation of municipal effluents by advanced treatment processes is an attractive perspective for facing certain water shortage problems. However, the application of tertiary techniques should be thoroughly examined for ... -
Investigation of a Ba(0.5)Sr(0.5)Co(0.8)Fe(0.2)O3-delta based cathode IT-SOFC - I. The effect of CO2 on the cell performance
(2006)A Ba0.5Sr0.5Co0.08Fe0.2O3-delta (BSCF) based cathode intermediate temperature solid oxide fuel cell (IT-SOFC) was fabricated and tested. The effect of carbon dioxide on the performance of BSCF cathode was evaluated at ... -
Investigation of a Ba0.5Sr0.5Co0.8Fe0.2O3-delta based cathode SOFCII. The effect of CO2 on the chemical stability
(2007)The effect of carbon dioxide on the chemical stability of a Ba0.5Sr0.5Co0.8Fe0.2O3-delta cathode in the real reaction environment at 450 degrees C was investigated by X-ray photoelectron spectroscopy (XPS), scanning electron ... -
Low and non-platinum electrocatalysts for PEMFCs: Current status, challenges and prospects
(2012)Platinum-based nanomaterials are the most commonly adopted electrocatalysts for both anode and cathode reactions in polymer electrolyte membrane fuel cells (PEMFCs) fed with hydrogen or low molecular alcohols. However, the ... -
Marginalised social groups in contemporary weee management within social enterprises investments: A study in Greece
(2009)This paper deals with the creation of appropriate conditions aimed at developing social services for reuse and recycling, of waste electrical and electronic equipment (WEEE), by the inclusion of handicapped and Roma people ... -
Mn-feroxyhyte: The role of synthesis conditions on As(III) and As(V) removal capacity
(2014)This study evaluates the critical parameters of synthesizing nanocrystalline tetravalent Mn-feroxyhyte, a single-phase arsenic adsorbent equally efficient against As(III) and As(V). The production of such Fe/Mn oxy-hydroxides ... -
Nitrogen-doped ordered mesoporous carbon: synthesis and active sites for electrocatalysis of oxygen reduction reaction
(2015)In the present work, a novel impregnation method, namely vaporization-capillary condensation method, is developed to synthesize nitrogen-doped ordered mesoporous carbon. This method allows for the preferential infiltration ... -
Noise spectra of K+ and NH4+ ions at over-limiting current in an electrochemical system with a cation exchange membrane
(2013)The present work investigates the effect of the counter ion nature on the noise of the over-limiting current (Iov). Moreover, the electrochemical methods, current voltage curve (I-V) and the chronopotentiometry (V-t) ... -
A novel approach for arsenic adsorbents regeneration using MgO
(2014)An integrated procedure for the regeneration of iron oxy-hydroxide arsenic adsorbents by granulated MgO is proposed in this study. A continuous recirculation configuration, with a NaOH solution flowing sequentially through ... -
Occurrence of Cr(VI) in drinking water of Greece and relation to the geological background
(2015)This study provides a survey on potential Cr(VI) exposure attributed to drinking water in Greece. For this reason, a wide sampling and chemical analysis of tap waters from around 600 sites, supplied by groundwater resources, ... -
Statistical evaluation of PCDD/F emission data during solid waste combustion by fuzzy clustering techniques
(2001)An advanced statistical analysis technique using the fuzzy clustering method was employed in this work, for the evaluation of PCDD/F emissions during solid waste combustion. In addition, this technique was applied for the ... -
Stochastic analysis and prioritization of the influence of parameter uncertainty on the predicted pressure profile in heterogeneous, unsaturated soils
(2006)This article utilizes a Monte Carlo stochastic framework to investigate the influence on the mean and variance of the predicted mean pressure head profile of statistical assumptions regarding the parameters that enter the ... -
Sustainable Development in an N-Rich/N-Poor World
(2014)Sustainable development requires that per capita inclusive wealth-produced, human, and natural capital-does not decline over time. We investigate the impact of changes in nitrogen on inclusive wealth. There are two sides ... -
Tetravalent Manganese Feroxyhyte: A Novel Nanoadsorbent Equally Selective for As(III) and As(V) Removal from Drinking Water
(2013)The development of a single-phase Fe/Mn oxy-hydroxide (delta-Fe0.76Mn0.24OOH), highly efficient at adsorbing both As(III) and As(V), is reported. Its synthesis involves the coprecipitation of FeSO4 and KMnO4 in a kilogram-scale ... -
Uptake of Zn2+ ions by a fully iron-exchanged clinoptilolite. Case study of heavily contaminated drinking water samples
(2007)Clinoptilolite, a natural zeolite, was used for the synthesis of a high surface area clinoptilolite (Clin)-iron (Fe) oxide system, in order to be used for the removal of Zn2+ ions from drinking water samples. The new system ... -
Use of an iron-overexchanged clinoptilolite for the removal of Cu2+ ions from heavily contaminated drinking water samples
(2008)Clinoptilolite, a natural zeolite, was used for the synthesis of a high surface area clinoptilolite-iron oxide system, in order to be used for the removal of Cu2+ ions from drinking water samples. The solid system was ...