1,721,222 research outputs found
Applicazione della Teoria dell'Equilibrio dello Scambio Ionico alla Decalcificazione dell'Acqua di Mare
No full textHeat transfer in turbulent flow on a horizontal tube falling film evaporator. a theoretical approach
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Recent Solutions for Efficient Carbonyl Sulfide Hydrolysis: A Review
No full textCarbonyl sulfide (molecular formula COS) is the most abundant organic sulfur compound present in the atmosphere, and its removal to satisfy the worldwide limitations on emissions of injurious substances is one of the challenging issues in the desulfurization technologies scenario. The hydrolysis of carbonyl sulfide can be addressed as a new frontier in the removal of sulfur compounds. The interest toward this process arose significantly in the past 20 years, mainly because of the new regulations on harmful gases emissions and because of the exploitation of fossil fuels with higher sulfur content. According to the current literature, COS hydrolysis can be performed as low-temperature and high-temperature processes, giving rise to the establishment of different mechanisms and phenomena. Through a detailed analysis of the recent advances in the field, low-temperature hydrolysis was identified as the most promising alternative for the industrial scenario. To overcome the kinetic limitations, the modification of alumina-based catalysts having enhanced porous structures with electron-donating substituents (such as alkaline and alkaline-earth metals) was found particularly effective, since hydrolysis has been identified as a base-catalyzed reaction. In addition, in this process, hydrotalcite and hydrotalcite-like materials find a satisfactory application. Due to the strongly limited kinetics, the adsorption of the components of the reaction mixtures is controlling, and therefore, the most credited reaction mechanism is described through a Langmuir-Hinshelwood model. Despite the strong appeal of the process, industrial applications still involve mainly high-temperature hydrolysis; indeed, most of the recent patents report operating temperatures in the range of 100-300 °C
Water saving in a two stage diafiltration process for the production whey protein concentrate
No full textExperimental study and simulation on the biosorption of copper (II) in membrane reactors: a preliminary study
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A simulation study on biosorption of toxic metals by confined biomass in UF/MF membrane reactors.
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