22 research outputs found
A Critical Look At Mias
No full textIn this report the author brings a figure of the costs that go with the implementation of a landing aid, being a successor to the currently used system ILS. These cost figures should give the reader an insight in the possible costs necessary for the implementation of MIAS. Also a little discussion concerning the market value and the inherent political issues going with it are interwoven in part one of this thesis. Part two deals with the question of how other systems proved their required integrity norms. Especially a closer look at the way ILS System 4000 proved its maturity is given. Two possible methods to decide the service level of the equipment will be described and a list of works where several test specifications are described. Also, a new conception will be introduced, the “AI product”. Part three gives an answer to the following question: there is in the Kalman filter of MIAS the postulation of Gaussian shaped white noise, with a certain variance and on the other hand we want to fetch the stringent ICAO requirements (especially those for the system integrity). Do these two matters go hand in hand or do they conflict each other? Is there a way to fulfil the norms and in the meanwhile make use of the mathematical simplicity of Gaussian shaped white noise? As a reaction on these issues some approaches to adaptive Kalman filtering are described and a new manner of tuning a Kalman filter is set up, based on a system identification algorithm called MOESP.Applied SciencesElectrical EngineeringTelecommunications and Traffic Control Systems Grou
Fabrieksvoorontwerp etheenoxidesynthese
No full textDocument(en) uit de collectie Chemische ProcestechnologieDelftChemTechApplied Science
DMT- kristallisatie: Verslag van een onderzoek aan continu werkende DMT-kristallisatoren, uitgevoerd in de DMT-fabriek van NV Petrochemie te Delfzijl (2e gedeelte)
No full textKramers Laboratorium voor Fysische TechnologieApplied Science
Experimental and numerical modelling of tsunami waves generated by landslides
No full textCivil Engineering and Geoscience
Coastal defence for Centro Habana: Integral coastal defence for section 4 of the Malecón and hurricane generated hydraulic boundary conditions
No full textMaster project report. Havana is protected from the sea’s severity by a seawall which is called the Malecón. The study area of this report is section 4 of the Malecón which more or less matches the coast of the district ‘Centro Habana’. Since the construction of the Malecón the hinterland has frequently been flooded due to storms and hurricanes in the Gulf of Mexico and on the Atlantic Ocean. Recent inundations were caused by hurricanes Michelle (2001) and Wilma (2005). Among the damaged buildings was the Almejeiras hospital, one of Cuba’s most important. The inundations are mainly caused by waves overtopping the seawall. In the present situation the seawall is 4.3 m above MSL and during design conditions 274 litres of water will be discharged per metre over the seawall on time average. Other contributing mechanisms are rainfall and wave penetration into the drainage system, which are in the order of 10 l/s/m. Because the overtopping is the most important cause the main objective of the report is to find feasible alternatives to drastically decrease the overtopping. A solution has to be integrated with the drainage systems to prevent build up of the water mass in the hinterland. First research was done on the causes. With the findings a list of conditions and a list of demands for the solution was formed. Directly after, all sorts of solutions were considered and weighed in a Multi Criteria Analysis, resulting in a berm in front of the seawall and a submerged detached breakwater as the best alternatives. These have been investigated further. Both the berm and breakwater are considered feasible. The berm must be made of rubble with a nominal diameter for the armour layer of 1.0 m. At the crest (MSL + 2 m) the berm is 6 m wide and the bottom ends about 30 m seaward of the wall. Unfavourable aspects of the berm are that it is situated above MSL and that its height makes the permeability performance questionable. The breakwater should be a rubble mound breakwater. A monolithic breakwater proved unfavourable due to the required width and the high transmission. The rubble breakwater is about 90 m off shore. The armour layer consists of 1.5 m rocks, the crest, situated at MSL, is 10 m wide and the height is 7.3 m. The breakwater is more expensive because it requires more material. It matches the list of conditions and demands better and therefore its value is also much higher than the berm’s. The secondary objective of the report is finding hydraulic boundary conditions which are generated by hurricanes. To reach this objective first a literature study on hurricanes was done to gain knowledge of wind generation and wave spectrum generation by wind fields. For this analytical and empirical approaches were investigated. An analysis was done on hurricanes that have past Cuba in the past century. This resulted in parameters that affect the sea severity. The most important parameters are the fetch and the forward speed of the hurricane. From the study on the parameters two worst paths of hurricanes for the Havana coast have been derived.Hydraulic EngineeringCivil Engineering and Geoscience
Machine learning improves the modelled wave spectrum in the North Sea
No full textTo improve the energy density and directional spectra computed with the SWAN model for the North Sea, a data-driven model is trained to correct the SWAN spectra. After training of the data-driven model on a year of observed and modelled data, the energy density and directional spectrum are corrected for three locations in the North Sea. When this correction is applied, the SWAN results are significantly improved. Both the energy density and the directions show a reduction in RMSE of up to 30% for the directions and 26 % for the energy density. Due to the short computational time of the data-driven model, this approach can easily be implemented in an operational forecast system
Development Of Colors With Sustainability: A Comparative Study Between Dyeing Of Cotton With Reactive And Vat Dyestuffs
No full textThis study compared reactive dyestuffs and vat dyestuffs in the dyeing of cotton. We investigated the possibility of reuse of the effluent generated, the ecological costs, and the colorfastness to water, rubbing, daylight, and perspiration. The experiments with vat dyestuffs showed slight advantage in terms of ecological costs, generating less molecules of carbon dioxide than the experiments conducted with reactive dyestuffs, lower consumption of energy, and greater possibility for reuse of treated effluent. In addition, vat dyestuffs exhibited decolorization efficiency above 99% and rates of total organic carbon removal over 90% in all cases, in addition to higher values in colorfastness properties. © The Author(s) 2014 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.841010091017Prado, M.V., (2011) Sectoral report of the Brazilian textile industry, , ABIT/IEMI (in Portuguese)Ignachewski, F., Fujiwara, S.T., Cótica, L.F., Degradation of reactive dyes by photo-fenton process involving the use of molecular sieve 4A modified with Fe3+ (2010) Quim Nova, 338, pp. 1640-1645Ruschioni, R., Finishing processes in wet opened knitted under ecological considerations and aspects of quality (2007) Rev Quim Text, 86, pp. 54-65Riera-Torres, M., Gutierrez-Bouzan, M.C., Morell, J.V., Influence of electrochemical pre-treatment in dyeing wastewater reuse for five reactive dyes (2011) Text Res J, 81, pp. 1926-1939Salem, V., (2010) Textile Dyeing: Fibers, Concepts and Technologies, pp. 151-174. , Sao Paulo, Brazil: Ed. Blucher(2010) Sectoral activities: Dyes and pigments, , www.abiquim.org.br/corantes, Abiquim - Brazilian Association of Chemical Industry, (2009, accessed 22 FebruaryAl-Degs, Y.S., El-Barghouthi, M.I., El-Sheikh, A.H., Effect of solution pH, ionic strength, and temperature on adsorption behavior of reactive dyes on activated carbon (2008) Dyes Pigm, 77, pp. 16-23Rosa, J.M., Reactive or vat dyes? Advantages and disadvantages in the dyeing of 100% yarn cotton (2008) Rev Quim Text, 93, pp. 12-28Oliveira, P.A., Rosa, J.M., Silveira, E., Study of decomposition and reuse of textile effluent: a comparison between biological and advanced oxidative process (2009) Rev Quim Text, 97, pp. 48-54Belessi, V., Romanos, G., Boukos, N., Removal of Reactive Red 195 from aqueous solutions by adsorption on the surface of TiO2 nanoparticles (2009) J Hazard Mater, 170, pp. 836-844Zollinger, Z., (1991) Color Chemistry: Syntheses, Properties and Applications on Organic Dyes and Pigments, p. 496. , 2nd ed. New York: VCH Publishers, 1991, pp. 496-496.;, New York: VCH PublishersShore, J., (2002) Colorants and Auxiliaries. Vol.1: Colorants, pp. 356-443. , 1: Colorants, 2nd ed. Manchester, UK: Society of Dyers and Colourists, 2002, pp. 356-443.;, Manchester, UK: Society of Dyers and ColouristsPark, J., Shore, J., (2004) Practical Dyeing, pp. 50-51. , Manchester, UK: Society of Dyers and ColouristsBomberger, D.C., Gowinn, J.E., Boughton, R.L., (1984) Wastes from Manufacture of Dyes and Pigments: Volume 4, Anthraquinone Dyes and Pigments, pp. 45-46. , US Environmental Protection AgencyCheremisinoff, N.P., (2001) Handbook of Pollution Prevention Practices CRC Press, p. 238Bastian, E.Y.O., Rocco, J.L.S., (2009) Technical Environmental Guide of Textile Industry, , São Paulo, Brazil: CETESB: SINDITE^XTILBurkinshaw, S.M., Kabambe, O., Attempts to reduce water and chemical usage in the removal of bifunctional reactive dyes from cotton. Part 2: bis(vinyl sulfone), aminochlorotriazine/vinyl sulfone and bis(aminochlorotriazine/vinyl sulfone) dyes (2011) Dyes Pigm, 88, pp. 220-229Valh, J.V., Le Marechal, A.M., Vajnhandl, S., Jeric, T., Simon, E., Water in the Textile Industry (2011) Treatise Water Science, 4, pp. 685-706. , ElsevierGhodbane, H., Hamdaoui, O., Decolorization of antraquinonic dye, C.I (2010) Acid Blue 25, in Aqueous Solution by Direct UV Irradiation, UV/H2O2 and UV/Fe(II) Processes. Chem Eng J, 160, pp. 226-231Günes, Y., Atav, R., Namirti, O., Effectiveness of ozone in decolorization of reactive dye effluents depending on the dye chromophore (2012) Text Res J, 82, pp. 994-1000Rosa, J.M., Sustainability in textile processing: Production of dyes with reuse of treated effluent by photocatalysis UV/H2O2, , Dissertation, UNINOVE, 2010 (in Portuguese)Braúna, C.H.C., Mota, S., Santos, A.B., Descoloração redutiva do corante azo RR2 na ausência e presença de mediador redox e aceptor de elétrons nitrato (2009) Eng Sanit Ambient, 14, pp. 275-284Kusic, H., Koprivanac, N., Bozic, A.L., Environmental aspects on the photodegradation of reactive triazine dyes in aqueous media (2013) J Photochem Photobiol A, 252, pp. 131-144Pang, Y.L., Abdullah, A.Z., Fe3+-doped TiO2 nanotubes for combined adsorption-sonocatalytic degradation of real textile wastewater (2013) Appl Catal B, 129, pp. 473-481Rosa, J.M., Tambourgi, E.B., Santana, J.C.C., Reuse of textile effluent treated with advanced oxidation process by UV/H2O2 (2012) Chem Eng Trans, 26, pp. 207-212(2005) Standard Methods for the Examination of Water and Wastewater, , 21st ed. Washington, DC: American Public Health Association, 2005.;, Washington, DC: American Public Health AssociationJosé, H.J., Combustion and fuels, , Food and Chemical Engineering Department, Federal University of Santa Catarina - UFSC, 2004Tests for colorfastness, , ABNT NBR ISO 105-E01:2011, Part E01: Colorfastness to waterTests for colorfastness, , ABNT NBR ISO 105-E04:2009, Part E04: Colorfastness to perspirationTests for colorfastness, , ABNT NBR ISO 105-X16:2009, Part X16: Colorfastness to rubbingAhu Demiroz Gun, A.D., Tiber, B., Color, colorfastness, and abrasion properties of 50/50 bamboo/cotton blended plain knitted fabrics in three different stitch lengths (2011) Text Res J, 81, pp. 1903-191
Impact of g -factors and valleys on spin qubits in a silicon double quantum dot
No full textWe define single electron spin qubits in a silicon metal-oxide-semiconductor double quantum dot system. By mapping the qubit resonance frequency as a function of a gate-induced electric field, the spectrum reveals an anticrossing that is consistent with an intervalley spin-orbit coupling. We fit the data from which we extract an intervalley coupling strength of 43 MHz. In addition, we observe a narrow resonance near the primary qubit resonance when we operate the device in the (1,1) charge configuration. The experimental data are consistent with a simulation involving two weakly exchanged-coupled spins with a Zeeman energy difference of 1 MHz, of the same order as the Rabi frequency. We conclude that the narrow resonance is the result of driven transitions between the T- and T+ triplet states, using an electron spin resonance signal of frequency located halfway between the resonance frequencies of the two individual spins. The findings presented here offer an alternative method of implementing two-qubit gates, of relevance to the operation of larger-scale spin qubit systems.QCD/Veldhorst La
Modelagem de conhecimento estratégico nos processos de negócio: proposta de um modelo suportado pela metodologia CommonKADS
No full textDissertação (mestrado) - Univesidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-graduação em Engenharia e Gestão do ConhecimentoOs processos de negócio abrigam conhecimento em diversos formatos e níveis de importância. Esse conhecimento necessita ser mapeado de acordo com as diretrizes estratégicas da organização. Desta forma, este estudo pretende resolver, através da Engenharia do Conhecimento, o seguinte problema: Como modelar o conhecimento estratégico presente nos processos de negócio? O objetivo geral é propor um modelo organizacional que permita priorizar o conhecimento estratégico presente nos processos de negócio, representando-o de forma a obter diretrizes que orientem os software a suportar a gestão do conhecimento, ampliando a performance organizacional. Os objetivos específicos são: identificar e definir critérios para determinar o que é conhecimento estratégico nos processos de negócio; alinhar a visão estratégica à formalização do conhecimento estratégico presente nos processos de negócio; estabelecer indicadores para a avaliação da aderência da modelagem do conhecimento estratégico com os sistemas de apoio às práticas de GC; estabelecer a aplicação da metodologia CommonKADS para verificação do modelo proposto. Este estudo classifica-se como uma pesquisa exploratória, com a aplicação do modelo criado através de estudos de caso nas empresas Docol Metais Sanitários e Claris Portas e Janelas. Como resultados alcançados têm-se a formulação de um modelo com orientação estratégica, estruturado para modelagem de conhecimento nos processos de negócio; a aplicação do modelo através de estudo de caso e a contribuição para o desenvolvimento de propostas de modelos que auxiliem as organizações a sustentar suas estratégias de Gestão do Conhecimento através de técnicas de Engenharia do Conhecimento
