1,720,996 research outputs found
APPARECCHIATURA A FLUSSO VORTICOSO PER REALIZZARE UN'INTERAZIONE TRA UN FLUIDO ED UN SOLIDO E PROCESSO DI INTERAZIONE FLUIDO-SOLIDO IMPIEGANTE LA STESSA
No full textApparecchiatura perfezionata per la generazione di plasma e processo per il trattamento di materiali tessili o polimerici impiegante la stessa
No full textProcess diagnostics in atmospheric continuous plasma equipment for fabric and polymeric film treatment
No full textAn equipment for atmospheric continuous treatment applicable to various textile materials was investigated to characterize its thermal, energetic, hydrodynamic and chemical features. The main characteristic of this prototype is provided by the peculiar fashion of contacting the fabric by the gaseous plasma blade jet. The operative variables of the process are gas flow rate and composition, electrical power to the plasma generator, fabric velocity, distance from gas inlet to accommodate different textile structures, as well as the impact gas-to-fabric angle. The diagnostics on the equipment was carried out to improve the plasma treatment homogeneity and generate an effective feedback analysis to the prototype manufacturer. The gas inlet was characterized in terms of thermal and gas velocity transversal profiles; in addition, the residual oxygen concentration was measured along the fabric motion direction and with a stimulus/response dynamic technique, i.e. after commuting the gas feed from air to pure nitrogen at several flow rates. The fabric itself was monitored by six infrared sensors downstream of the gaseous plasma contact. Besides the local property profiles, the comprehensive effect of the energy transferred to the moving substrate was evaluated by the blackening intensity on a thermal paper by reflection spectrophotometry. All these measurements have shown that the prototype definitely requires substantial improvements as far as the gas distribution is concerned to fully demonstrate its excellent potentiality to in-line functionalize textile substrates; further operative variables can also be controlled in a second release of this prototype
Industrial experimentation on hank-dyeing: modelling equipment and water economisation during rinsing
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Comparison of different technologies for textile wastewater treatment.
No full textTextile wastewaters are usually subjected to secondary activated sludge treatment before being discharged in the environment or re-used. In order to improve the efficiency of this treatment, four reactors possessing different configurations and fluid dynamic characteristics (i.e. a Bioflotation® system; a fixed bed biofilm reactor (FBBR) filled with polypropylene balls; a flow-jet aeration system and a conventional activated sludge reactor) were developed and fed with a textile industry wastewater. COD, TC and non ionic surfactant concentrations were monitored in the reactor effluents and the cultivable heterotrophic biomass was isolated from the effluents. The results evidenced that the fluid dynamic characteristics and the air supply system can greatly influence the degradation efficiency of the secondary treatment. In particular, Bioflotation® and FBBR technologies appear to be the most efficient in term of pollutant removal. An highly specialized biomass, rich in strains belonging to the Pseudomonas and Stenotrophomonas genera, was evidenced in these reactors, thus allowing to conclude that there is a direct correlation among reactor configuration, biomass specialization and reactor performances
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
Optimization of the liquor distribution in yarn package dyeing by CFD
No full textThe aim of this work was to simulate the fluid flow in the spindle-bobbin system using computational fluid dynamics (CFD). In the frame of a wider project finalized at dyeing machinery diagnostics, the CFD simulations in the distribution apparatus offer an interesting tool to investigate various spindle geometries and choose the best structure afore of designing industrial scale dyeing equipment. The flow behaviour has been predicted using the k-e model in the commercial CFD package of Fluent 6.2
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