Πλοήγηση ανά Θέμα "Engineering, Chemical"
Αποτελέσματα 21-40 από 83
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Ecosystem simulation modeling of nitrogen dynamics in the restored lake Karla in Greece
(2011)Restored lakes are complex dynamic ecosystems. Ecosystem-level modeling of the processes that take place in a lake is a useful tool for understanding lake function and structure and for making predictions. A nitrogen ... -
Effect of Fluid Properties on Flow Patterns in Two-Phase Gas Liquid Flow in Horizontal and Downward Pipes
(2011)This paper investigates the effect of gas density and surface tension on flow pattern transitions in horizontal and near-horizontal pipes. Experiments were conducted at atmospheric conditions in a 12.75-m long pipe with a ... -
Effect of system parameters and of inorganic salts on the decolorization and degradation of Procion H-exl dyes. Comparison of H2O2/UV, Fenton, UV/Fenton, TiO2/UV and TiO2/UV/H2O2 processes
(2007)Reactive dyes are extensively used in the last years due to their superior performance, but they are environmentally hazardous. In the present work, the decolorization and degradation of commercial reactive azo dyes (Procion ... -
Effects of treated municipal wastewater on the essential nutrients interactions in the plant of Brassica oleracea var. Italica
(2009)The effects of the treated municipal wastewater (TMWW) on the essential nutrients interactions in the various plant parts of Brassica oleracea var. Italica (Broccoli) was studied, in comparison to the fresh irrigation ... -
Electrocatalytic activity of Vulcan-XC-72 supported Pd, Rh and PdxRhy toward HOR and ORR
(2015)Carbon-supported (Vulcan XC-72) Pd, Rh, and PdxRhy (20 wt%, x:y = 1:1, 3:1, 1:3) electrocatalysts are prepared according a modified pulse-microwave assisted polyol synthesis method and their electrocatalytic activity toward ... -
Electrochemical removal of bromate from drinking water
(2013)The electrochemical removal of bromate on a tin cathode has been studied by both electrochemical techniques, such as cyclic voltammetry and chronoamperometry, as well as by steady-state electrolytic experiments. The reduction ... -
Electrochemically promoted catalysis: The case of ethanol oxidation over Pt
(2002)Ethanol oxidation was investigated over polycrystalline Pt films deposited on 8 mol% Y2O3-stabilized-ZrO2 (YSZ) in the temperature range of 300-350degreesC. It was found that electrochemical supply of oxygen anions (O2-) ... -
Energy analysis of an improved concept of integrated PV panels in an office building in central Greece
(2011)During the last decade, steel constructions with glazed facades became popular for commercial buildings in Greece. Moreover, expensive metal, natural stone, marble, ceramic, granite as well as special glass is employed for ... -
Erosion probability for biofilm modeling: analysis of trends
(2014)This study presents the strengths and weaknesses of a biofilm erosion probability algorithm that can be used in cellular automaton and individual-based biofilm simulation models. The erosion probability is calculated using ... -
Ethanol crossover and direct ethanol PEM fuel cell performance modeling and experimental validation
(2006)In the present work, a one-dimension, steady-state and single phase model is developed with the purpose of describing the mass transport within a PtRu/Nafion (R)-115/Pt membrane-electrode assembly and the performance of a ... -
Ethanol Steam Reforming in a Two-Step Process. Short-Time Feasibility Tests
(2013)This paper describes a two-step process for hydrogen generation consisting of low-temperature (573 K) dehydrogenation of ethanol over copper chromite, followed by steam reforming (SR) over Ni/MgO at higher temperature (923 ... -
Flow and heat transfer inside a PV/T collector for building application
(2012)In certain building applications, the PV installation is extended to cover also south- or west-facing walls, taking care to circulate cooling air to the back of the panels. The cooling effect maintains a high conversion ... -
Glucose electrooxidation over PdxRh/C electrocatalysts in alkaline medium
(2014)Carbon Vulcan XC-72R supported PdxRh (x = 1, 2, 3) nanoparticles have been prepared by a modified pulse microwave assisted polyol method and have been studied for glucose electrooxidation in alkaline media. The PdxRh/C ... -
Heat transfer phenomena in a solid oxide fuel cell: An analytical approach
(2005)The steady-state heat transfer problem within a fuel cell is considered here. The original 2-D problem is defined while an averaging technique is used in order to reduce its dimensions to one. The full heat transfer equations ... -
Horizontal round heated jets into calm uniform ambient
(2009)In this article, we investigate horizontal, round, turbulent buoyant jets that discharge in a homogeneous calm ambient fluid. In a series of experiments performed, the initial jet Richardson numbers ranged from very small ... -
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 ... -
Hydrological response to meteorological drought using the Palmer drought indices in Thessaly, Greece
(2009)This Study evaluates the efficacy of Palmer drought indices to monitor hydrological droughts ill river discharges and soil moisture in selected watersheds with varying geomorphologic characteristics in region of Thessaly, ... -
Incorporating available micro gas turbines and fuel cell: Matching considerations and performance evaluation
(2013)The present paper aims to study the performance of the hybrid systems based on the fuel cell stack developed by Siemens-Westinghouse coupled with four different commercially available recuperated micro-turbines. The different ... -
Integrating Operational Hedging of Exchange Rate Risk in the Optimal Design of Global Supply Chain Networks
(2015)Supply chain network (SCN) design and operation is a strategic and value adding process for all synchronous companies. In the face of globalization, several issues should be contemplated and incorporated in decision support ...