Dissertations / Theses on the topic 'Diagramme de production'
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1
Moussa, Chantal. "Étude physico-chimique d'intermétalliques d'uranium pour des cibles médicales innovantes de production de ⁹⁹Mo." Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S091/document.
Abstract:
Cette thèse s’inscrit dans le cadre du développement de cibles d’irradiation faiblement enrichi en ²³⁵U pour la production du ⁹⁹Mo, radionucléide père du ⁹⁹mTc employé en imagerie médicale. La cible d’irradiation est une plaque fine en aluminium, dont l’âme fissile est constituée d’une dispersion de particules uranifères dans une matrice d’aluminium. Nos travaux plus spécifiquement ont mené à proposer une âme fissile alternative à celle actuellement employée. Pour évaluer les effets de l’affinité chimique, une approche thermodynamique par détermination des relations de phases a été considérée pour cinq systèmes ternaires de références. Les travaux expérimentaux ont conduit à la détermination de sections isothermes pour les systèmes U-Al-X avec X= Ti, Zr, Nb, Ga et Ge, pour deux températures, une basse et une haute températures représentatives des interactions avec l’uranium dans sa forme allotropique orthorhombique (αU) et cubique (gU) respectivement. Les systèmes ternaires U‑Nb-Al et U-Al-Ga, ont fait l’objet d’une optimisation thermodynamique par méthode CALPHAD. Des caractérisations supplémentaires ont été menées sur les phases intermédiaires afin de déterminer leurs propriétés physico-chimiques. Ces examens ont concerné leurs propriétés thermodynamiques (réaction de formation et température et pour certaines enthalpie de formation), structurales et également l’investigation de leurs propriétés électroniques. Cette thèse s’est également intéressée à l’étude des germaniures d’uranium ternaires, U₃TGe₅, en particulier à la recherche de nouvelles phases isotypes et à la caractérisation de leurs propriétés électroniques. Neuf nouveaux composés ont été identifiés pour les métaux T = V, Cr, Zr, Mn, Nb, Mo, Hf, Ta et W avec un arrangement structural similaire à l’antitype Hf₅CuSn₃ et des comportements variés et complexes, tels des fluctuations de spin, de l’ordre antiferromagnétique et ferromagnétique, illustrant le rôle prépondérant du métal de transition dans ces effets électroniquesThis thesis is in the framework of the development of low ²³⁵U enriched irradiation targets for the ⁹⁹Mo production, the mother isotope of ⁹⁹mTc, which is the main radioactive tracers used in nuclear medical imaging. The aim of this work is to identify a new material with a higher uranium density. To fulfil this objective, the determination of the phase relations has been considered for five ternary systems. The experimental work was the determination of the isothermal sections of the U-Al-X with X = Ti, Zr, Nb, Ga and Ge for two temperatures, for representative interactions with U in its orthorhombic form (αU) and cubic form (gU) respectively. The U-Nb-Al and U-Al-Ga ternary system were thermodynamically assessed by CALPHAD assessment. Subsequent characterizations have been carried out on the intermediate phases to determine their physical properties. These studies comprise their thermodynamic features (reaction of formation, including the reaction temperature and for some their enthalpy of formation), structural properties (by means of X-ray and electron diffractions) and their electronic properties, magnetic, and transport (electrical and thermal). This Ph-D thesis was extended to the study of ternary uranium germanides with the general formula U₃TGe₅ by seeking for new isostructural compounds and to investigate their electronic properties. Nine new compounds have been identified with the transition metal, T = V, Cr, Mn, Zr, Nb, Mo, Hf, Ta and W with an anti-Hf₅CuSn₃ structural type and various and complex behaviors, such as spin fluctuators, antiferromagnetic and ferromagnetic orders, emphasizing the predominant influence of the transition metal in these electronic phenomena
2
Teko, Ekoué. "Caractérisation du système de transformation, consommation et propriétés rhéologiques de la purée de niébé "adowè" au Togo." Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALI007.
Abstract:
La malnutrition est une menace importante pour la santé humaine. Au Togo, la purée de niébé appelée localement « Adowè » et potentiellement riche en nutriments peut servir à lutter contre la malnutrition déficitaire. Cependant, force est de constater que la sphère de production et de consommation de cette purée ne cesse de se réduire au fil des ans. Les présents travaux de thèse sur « Adowè » ont donc pour objectifs : (i) de contribuer à la lutte contre la carence nutritionnelle protéino-calorique par l’exploitation des agroressources endogènes comme le niébé (protéines végétales), (ii) de préserver l’environnement face à un rythme croissant de la consommation des protéines animales dans le monde. De ce fait, la valorisation et la réhabilitation de « Adowè » nous ont conduit à l’étude de sa production à l’échelle industrielle. La compression mécanique des graines de niébé pour déterminer leurs états cuits et les propriétés rhéologiques de la purée « Adowè » ont également été examinées dans cette thèse. Les résultats obtenus ont montré que l’état cuit des graines peut être évalué par des grandeurs physiques. L’énergie d’activation de cuisson des graines a également été déterminée. Ainsi, ces paramètres permettront de contrôler énergétiquement le procédé de cuisson des graines. La caractérisation rhéologique de la purée a montré un fluide à seuil pour les purées dont la concentration massique se situe entre 12 et 20%. Au-delà de 20% de concentration, la méthode de mesure de la viscosité par rotation pour la caractérisation rhéologique de « Adowè » n’est pas applicable. De ce fait, la méthode d’extrusion inverse a été exploitée pour quantifier la viscosité de « Adowè » à 31 ± 2 % (masse/masse). Ces résultats sont très intéressants et pourront être utiles pour un passage de la production artisanale à une production industrielle de « Adowè »Malnutrition is a significant threat to human health. In Togo, cowpea puree, known locally as "Adowè", is potentially rich in nutrients and can be used to fight against malnutrition. However, this puree has seen reduced production and consumption over time. The aim of this thesis is to contribute to the fight against protein-calorie malnutrition through the use of endogenous agricultural resources, such as cowpea seeds (plant proteins). In a world where animal proteins consumption is on the rise, this work also helps to contribute towards environmental preservation. Therefore, promoting the development and rehabilitation of "Adowè" requires us to study its production on an industrial scale. Experiments were carried out to determine the cooked state of the cowpea seeds by mechanical compression. The rheological properties of the "Adowè" puree were also determined. The results obtained show that the cooked state of the seeds could be assessed by physical quantities. The activation energy for the cooking of theseeds has also been determined. These parameters will therefore be the basis for the energetic control of the seed cooking process. Finally, the rheological characterisation of the puree was carried out using two methods. For purees with mass concentrations between 12 and 20%, "Adowè" is a yield stress fluid. Beyond 20% concentration, oscillatory and steady shear viscosity measurements of the puree become intractable. Therefore, back extrusion method was used to quantify the viscosity of the puree at 31±2% (mass/mass). These results are useful fortransitioning from artisanal to industrial production of "Adowè"
3
Sales, Silva Luiz Paulo. "Procédé de séparation par formation sélective d'hydrates de gaz pour la valorisation du biogaz." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLY021/document.
Abstract:
Le biogaz, constitué essentiellement de méthane et de dioxyde de carbone, représente une voie alternative aux sources d’énergies fossiles. Pour être valorisé le mélange doit être séparé dans un procédé de séparation de gaz. Ces dernières années, un nouveau procédé basé sur la formation d'hydrates de gaz (GSHF) a suscité une attention particulière dans la communauté scientifique. Basé sur une transition de phase hydrate – liquide – vapeur conduite en présence de promoteurs thermodynamiques, la purification est supposée demander moins d’énergie et moins de réactifs dangereux pour l’environnement que les procédés chimiques traditionnels comme l’absorption dans des solutions d’amines. Une connaissance des équilibres de phase dans les systèmes eau + gaz + additifs est essentielle à la validation du procédé. Dans ce projet, nous avons étudié quatre promoteurs, le bromure de trétrabutylammonium (TBAB), le bromure de tétrabutylphosphonium (TBPB), l’oxyde de tributylphosphine (TBPO) et le tétrahydropyrane (THP), qui ont pour buts d’abaisser la consommation d'énergie et d’améliorer la cinétique et la sélectivité du procédé. Une partie de ce projet a été consacrée à déterminer les conditions d'équilibre d'hydrates de gaz en présence de ces promoteurs et différentes phases gaz (CO2, CH4 et biogaz simulé). Les méthodes de calorimétrie différentielle à balayage (DSC) ont été appliquées pour mesurer les températures de transition de phase. De nouvelles données d'équilibre de phases ont été déterminées pour les systèmes hydrates de gaz + promoteurs. Dans la deuxième partie du projet, nous avons effectué des mesures quantitatives dans un réacteur instrumenté afin d'évaluer le procédé GSFH pour la valorisation du biogaz. Chaque promoteur a été évalué tant sur le plan de la cinétique (temps, d’induction, vitesse de croissance cristalline) que sur celui de la thermodynamique (quantité de gaz piégé, sélectivité). L'optimisation du programme de formation / dissociation des hydrates a montré d'excellents résultats en termes de cinétiqueBiogas represents an alternative path to fossil energies. It is composed mainly by methane and carbon dioxide. This couple must be separated in a gas separation process. In recent years, the new process based on gas hydrate formation (GSHF) has taken special attention in academic community. Besides, the use of thermodynamic promoters can increase the efficiency of the process. Since GSFH is based on phase transition phenomenon, knowledge about phase equilibria is essential. In this project, we have selected and studied four thermodynamic promoters (tretrabutylammonium bromide / TBAB; tetrabutylphosphonium bromide / TBPB; tributylphosphine oxide / TBPO; tetrahydropyran / THP) that have potential to improve GSFH process of biogas in terms of stability gain (less energy consumption), kinetics and selectivity. One part of this project consisted in determining the gas hydrate equilibrium conditions involving these promoters and the different gas phases (CO2, CH4 and simulated biogas). Differential scanning calorimetry (DSC) methods were applied to measure the phase transition temperatures. Therefore, new phase equilibrium data were determined for the promoter/gas hydrate systems. In the second part of the project, we carried out quantitative measurements in an instrumented reactor in order to evaluate the GSFH process for upgrading biogas. Each promoter was evaluated in kinetics and thermodynamics aspects, such as crystal growth rate, amount of gas trapped into the hydrate phase, and selectivity. The optimization of the hydrate formation / dissociation cycle showed excellent results in terms of kinetics improvement
4
Sales, Silva Luiz Paulo. "Procédé de séparation par formation sélective d'hydrates de gaz pour la valorisation du biogaz." Electronic Thesis or Diss., Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLY021.
Abstract:
Le biogaz, constitué essentiellement de méthane et de dioxyde de carbone, représente une voie alternative aux sources d’énergies fossiles. Pour être valorisé le mélange doit être séparé dans un procédé de séparation de gaz. Ces dernières années, un nouveau procédé basé sur la formation d'hydrates de gaz (GSHF) a suscité une attention particulière dans la communauté scientifique. Basé sur une transition de phase hydrate – liquide – vapeur conduite en présence de promoteurs thermodynamiques, la purification est supposée demander moins d’énergie et moins de réactifs dangereux pour l’environnement que les procédés chimiques traditionnels comme l’absorption dans des solutions d’amines. Une connaissance des équilibres de phase dans les systèmes eau + gaz + additifs est essentielle à la validation du procédé. Dans ce projet, nous avons étudié quatre promoteurs, le bromure de trétrabutylammonium (TBAB), le bromure de tétrabutylphosphonium (TBPB), l’oxyde de tributylphosphine (TBPO) et le tétrahydropyrane (THP), qui ont pour buts d’abaisser la consommation d'énergie et d’améliorer la cinétique et la sélectivité du procédé. Une partie de ce projet a été consacrée à déterminer les conditions d'équilibre d'hydrates de gaz en présence de ces promoteurs et différentes phases gaz (CO2, CH4 et biogaz simulé). Les méthodes de calorimétrie différentielle à balayage (DSC) ont été appliquées pour mesurer les températures de transition de phase. De nouvelles données d'équilibre de phases ont été déterminées pour les systèmes hydrates de gaz + promoteurs. Dans la deuxième partie du projet, nous avons effectué des mesures quantitatives dans un réacteur instrumenté afin d'évaluer le procédé GSFH pour la valorisation du biogaz. Chaque promoteur a été évalué tant sur le plan de la cinétique (temps, d’induction, vitesse de croissance cristalline) que sur celui de la thermodynamique (quantité de gaz piégé, sélectivité). L'optimisation du programme de formation / dissociation des hydrates a montré d'excellents résultats en termes de cinétiqueBiogas represents an alternative path to fossil energies. It is composed mainly by methane and carbon dioxide. This couple must be separated in a gas separation process. In recent years, the new process based on gas hydrate formation (GSHF) has taken special attention in academic community. Besides, the use of thermodynamic promoters can increase the efficiency of the process. Since GSFH is based on phase transition phenomenon, knowledge about phase equilibria is essential. In this project, we have selected and studied four thermodynamic promoters (tretrabutylammonium bromide / TBAB; tetrabutylphosphonium bromide / TBPB; tributylphosphine oxide / TBPO; tetrahydropyran / THP) that have potential to improve GSFH process of biogas in terms of stability gain (less energy consumption), kinetics and selectivity. One part of this project consisted in determining the gas hydrate equilibrium conditions involving these promoters and the different gas phases (CO2, CH4 and simulated biogas). Differential scanning calorimetry (DSC) methods were applied to measure the phase transition temperatures. Therefore, new phase equilibrium data were determined for the promoter/gas hydrate systems. In the second part of the project, we carried out quantitative measurements in an instrumented reactor in order to evaluate the GSFH process for upgrading biogas. Each promoter was evaluated in kinetics and thermodynamics aspects, such as crystal growth rate, amount of gas trapped into the hydrate phase, and selectivity. The optimization of the hydrate formation / dissociation cycle showed excellent results in terms of kinetics improvement
5
Kantar, Martin. "Ganttovy diagramy." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231384.
Abstract:
The thesis is aimed at Gantt charts. Primarily on their use in production processes, such as planning and scheduling. The thesis also includes an introduction, explaining what are the Gantt charts, for what are using and what is their principle. The thesis also includes analysis and software possibilities for implementing Gantt charts with using OOP. Programmatic and theoretical analysis of the various functions that are characteristic of Gantt charts, including their internal logic and program implementation. These programmed characteristic functions of Gantt charts were composed in the form of a DLL library, which provides a simple implementation of Gantt charts. By using this library is realized the software for production management. The work is included on the DVD, except the DLL itself software with detailed descriptions of each part of the source code.
6
Chivers, Daniel. "Improving automated layout techniques for the production of schematic diagrams." Thesis, University of Kent, 2014. https://kar.kent.ac.uk/50750/.
Abstract:
This thesis explores techniques for the automated production of schematic diagrams, in particular those in the style of metro maps. Metro map style schematics are used across the world, typically to depict public transport networks, and therefore benefit from an innate level of user familiarity not found with most other data visualisation styles. Currently, this style of schematic is used infrequently due to the difficulties involved with creating an effective layout – there are no software tools to aid with the positioning of nodes and other features, resulting in schematics being produced by hand at great expense of time and effort. Automated schematic layout has been an active area of research for the past decade, and part of our work extends upon an effective current technique – multi-criteria hill climbing. We have implemented additional layout criteria and clustering techniques, as well as performance optimisations to improve the final results. Additionally, we ran a series of layouts whilst varying algorithm parameters in an attempt to identify patterns specific to map characteristics. This layout algorithm has been implemented into a custom-written piece of software running on the Android operating system. The software is targeted at tablet devices, using their touch-sensitive screens with a gesture recognition system to allow users to construct complex schematics using sequences of simple gestures. Following on from this, we present our work on a modified force-directed layout method capable of producing fast, high-quality, angular schematic layouts. Our method produces superior results to the previous octilinear force-directed layout method, and is capable of producing results comparable to many of the much slower current approaches. Using our force-directed layout method we then implemented a novel mental map preservation technique which aims to preserve node proximity relations during optimisation; we believe this approach provides a number of benefits over the the more common method of preserving absolute node positions. Finally, we performed a user study on our method to test the effect of varying levels of mental map preservation on diagram comprehension.
7
Bacaksız, Fatih Atagündüz Gürbüz. "Evaluations of Porous Burner Characteristic Diagrams and Process Water Production Possibilities/." [s.l.]: [s.n.], 2002. http://library.iyte.edu.tr/tezler/master/enerjimuh/T000152.rar.
8
Oswald, Pascal. "Photo- et électro-production de kaons sur le nucléon et le deuton." Lyon 1, 2001. http://www.theses.fr/2001LYO10176.
Abstract:
Nous présentons une étude phénoménologique basée sur un Lagrangien effectif, via les diagrammes de Feynman au premier ordre, pour décrire les réactions de photoproduction d'étrangeté sur le proton : γp → K+ Λ, K+ Σ⁰, K⁰Σ⁺, K+ Λ* (1405) ; sur le neutron : γn→ K+ Σ⁻ ; et sur le deuton d(γ, K⁺)X dans l'approximation de l'impulsion relativiste, ainsi que l'ensemble de ces processus avec un faisceau d'électrons. Notre formalisme incorpore également les réactions de capture radiative K⁻p → γΛ, γΣ⁰. Les paramètres libres des modèles sont déterminés par des ajustements sur l'ensemble des résultats expérimentaux disponibles pour les observables de ces réactions, du seuil à Eγ [exposant lab] ≈ 2. 5 GeV. Le formalisme des effets hors-couche inhérent au traitement des résonances nucléoniques et hypéroniques de spin 3/2, déjà développé pour la production de K+ Λ est généralisé à l'ensemble des réactions ci-dessus. Une étude approfondie des facteurs de forme électromagnétique des hadrons étranges via les réactions d'électroproduction est effectuée. Nous avons également introduit des facteurs de forme aux vertex hadroniques dans la description des réactions de photo- et électro-production, tout en préservant l'invariance de jauge. Le formalisme ainsi développé est utilisé dans la recherche de modèles pour la production électromagnétique d'étrangeté associée sur le nucléon et le deuton. Après une étude détaillée des ingrédients des mécanismes des réactions, nous présentons des modèles relativement simples permettant de décrire les données disponibles. Enfin, nous mettons en exergue la spécificité de chaque observable et proposons des perspectives pour des études expérimentales et théorique en la matière.
9
Crochet, Philippe. "Etude des collisions d'ions lourds aux énergies du SIS et du LHC." Habilitation à diriger des recherches, Université Blaise Pascal - Clermont-Ferrand II, 2005. http://tel.archives-ouvertes.fr/tel-00011353.
Abstract:
La physique des collisions d'ions lourds (ultra-)relativistes a pour objectif principal l'élaboration de l'équation d'état de la matière nucléaire par l'examen de ses propriétés dans des conditions extrêmes de température et de pression.A basse énergie, les collisions d'ions lourds permettent de sonder la matière nucléaire modérément chaude à grande densité baryonique.
A haute énergie, la chromodynamique quantique prédit le déconfinement des constituants des hadrons en un plasma de quarks et de gluons.
La première partie de ce document est consacrée à l'étude de la production d'étrangeté dans les collisions d'ions lourds aux énergies du SIS avec le détecteur FOPI installé au GSI.
La deuxième partie de ce document est consacrée à l'étude de la production des saveurs lourdes dans les collisions d'ions lourds aux énergies du LHC avec le détecteur ALICE installé au CERN.
10
Addis, Kyle A. "A Corrosion Model for Production Tubing." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1417085983.
11
Hedlund, Björn. "XLPE-cable Production Optimization : Setup time Reduction at Armoring line." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-5240.
Abstract:
At ABB’s high voltage cable factory in Karlskrona, there is a line production that is regarded as a bottleneck. The production rate at this workplace as well as the large variations of setups has created two major problems. The first problem is that it has become difficult for the planning department to determine the lead times for delivery to the customers. The other problem is that the long setup times has made this line production the bottleneck of the whole production. The factory at ABB HVC includes a number of line productions, where each line has their own purpose and value adding processes. The armoring line AR50 that this project has the focus to improve has the last value adding processes for the factory’s main product. The factory’s main product is the Cross-Linked Polyethylene cable, shortened XLPE. There are several different advantages with the XLPE-cable system. First of all they are maintenance-free and environmentally friendly. The main reason that the XLPE-cable is environmentally friendly is because it have low electrical losses. Since the submarine cables are underground the cables are invisible and not effected by weather conditions. This project implements the method SMED as well as various methods from the LEAN transcript in order to reduce the setup times and create a more stable and effficient production. An Ishikawa diagram were used in order to determine the root causes of the problems. Later both technical and management solutions were proposed and implemented. The project has concluded impressive results regarding setup time reduction and annual cost savings. It also enlightens the large potential for further improvement. This project will be continued during the year of 2014 in order to implement the proposed solutions. The future improvements are not just technical but also related to management and group dynamics.
12
Inal, Mine. "Ethyl Lactate Production By Hybrid Processes: Determination Of Phase Diagrams And Evaluation Of Performance Of Organophilic Pervaporation Membranes." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/4/1121243/index.pdf.
Abstract:
Ethyl lactate is a promising, and environmentally benign chemical, which requires efficient separation techniques to overcome the equilibrium limitations in its production. Pervaporation based hybrid systems are successful in these type of equilibrium limited reactions, where product and/or by-product are removed from reaction medium by pervaporation unit(s) so as to drive reaction to completion. For the production of ethyl lactate four possible semi-batch hybrid systems were previously proposed. However, in order to select the suitable hybrid system within the proposed layouts phase equilibrium and reaction kinetics of the system must be well defined in addition to the performance data of the pervaporation membranes. Therefore, vapor pressure curve of ethyl lactate, VLE curves of ethanol-ethyl lactate and ethyl lactate-water were determined and performances of commercial hydrophobic membranes were investigated experimentally for the separation of ethanol-ethyl lactate mixtures.
As a result of vapor pressure and VLE experiments, azeotrope was observed at 71wt% of water for ethyl lactate-water binary mixture at 80mmHg pressure. Furthermore, dependence of vapor composition on pressure was found to be slight for ethanol-ethyl lactate mixtures.
Two commercial hydrophobic membranes, and an organoselective one were used in the separation of ethyl lactate-ethanol mixtures. It is found that hydrophobic membranes have sufficient fluxes and reasonable selectivities. Moreover, it is observed that as temperature increase flux increases and selectivity decreases. Finally, it is concluded that it would be possible to produce ethyl lactate by using the previously proposed integrated PV-esterification reactor systems.
13
Motyčka, Jan. "Návrh interního zásobování výroby ve společnosti Walter s.r.o." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2016. http://www.nusl.cz/ntk/nusl-241482.
Abstract:
The diploma thesis is focused on proposal of internal production supply in the Walter Ltd. The company is undergoing changes in the production layout and therefore it is necessary to design a new system of production supply. The theoretical part focuses on Toyota production system and methods used in this system. Next part of the theoretical part is dedicated to lean management and lean manufacturing. The last point of theoretical part are supplying and material handling. The theoretical part is basis for analytical part in which is mapped the current state of supplying production lines. The last point of diploma thesis are solution proposals based on analytical data’s.
14
SOLOMON, JULIE A. "APPLICATION OF THE PRINCIPLE OF LEAN PRODUCTION TO CONSTRUCTION." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092947456.
15
Lévek, Martin. "Štíhlá výroba a její implementace." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2019. http://www.nusl.cz/ntk/nusl-400165.
Abstract:
This thesis analyzes the materiál flow, layout of the workplace and varieties of waste in the chosen company. There is theoretical background for the thesis in the first part. Next part is focused on analyzing of present manufacturing process. There are provided solutions for lean implementation, better material flow and elimination of the waste in the manufacturing process in the last part.
16
Nordine, Anas. "Applicazione dei principi della Lean Production nel processo di produzione e posa delle facciate continue." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19720/.
Abstract:
La presente tesi è frutto di 30 mesi di lavoro presso il Gruppo SIMEON srl leader italiano nella produzione e posa delle facciate continue con 3 sedi in Italia e diverse commesse in Europa America e Nord Africa, nell'elaborato viene approfondito il mio contributo nella riorganizzazione dell’azienda. L’obiettivo è quello di analizzare in modo critico l’intero sviluppo di una commessa e quindi apportare delle modifiche in ottica migliorativa. Lo strumento più adatto e utile a tale scopo è l’applicazione delle tecniche del Lean Production, La sfida reale è quella di identificare correttamente quale sia il valore per il cliente finale e di conseguenza analizzare tutti i processi aziendali per renderli attività a valore aggiunto minimizzandone gli sprechi e le inefficienze ottenendo anche una riduzione di tempo e di costi. Il contributo offerto è stato un po’ alla volta ampliato su più aspetti della commessa, partendo dalla definizione di una serie di criticità in cui eseguite le loro analisi in dettaglio sono stati applicati delle soluzioni suggeriti dalla filosofia della Lean Production. I risultati ottenuti sono per la maggior parte molto positivi, nel caso dell’applicazione del 5S ad esempio si ha un guadagno immediato di circa 21000 € a fronte di circa 6300 € di investimento senza considerare anche i benefici a lungo termine che sono ancora più significativi. questi risultati andrebbero comunque costantemente monitorati, cercando di diffondere il più possibile la filosofia Lean e i suoi principi tra i dipendenti, facendo particolare attenzione a non farla percepire come un qualcosa di imposto dai piani alti perché si rischia di avere una mancanza di collaborazione e comunicazione con il personale.
17
Campos, Marcos Rogério Ribeiro. "Melhorias no sistema de planejamento, programação e controle da produção : um estudo de caso em empresa eletroeletrônica." Universidade de Taubaté, 2009. http://www.bdtd.unitau.br/tedesimplificado/tde_busca/arquivo.php?codArquivo=339.
Abstract:
A flexibilidade dos sistemas de produção tornou-se indispensável para a sobrevivência das empresas de manufatura no mercado global, que impulsionada pelo crescente avanço das tecnologias utilizadas nos processos, nem sempre encontra ressonância nos sistemas de PPCP (planejamento, programação e controle da produção) existentes. Neste sentido, esta dissertação apresenta o estudo de caso realizado em uma empresa eletroeletrônica que mesmo dispondo de alta tecnologia em seu processo de fabricação, se deparava com a necessidade de implementação de técnicas que pudessem proporcionar melhorias na captação e atendimento de pedidos com curto prazo de entregas ou de alterações de pedidos já colocados. Seria necessário melhorar a flexibilização do processo de produção através de novas ações do PPCP que adotando uma posição mais analítica com o emprego de novas ferramentas de trabalho teria meios de agir decisivamente para a obtenção de melhores resultados. Não dispondo de muitos recursos, a empresa pesquisada deveria adotar soluções de baixo custo e complexidade que pudessem viabilizar sua rápida implantação. A modalidade de pesquisa realizada foi o estudo de caso, favorecido pela participação do autor ao longo do processo em estudo. Para gerar subsídios para essa dissertação foram feitas pesquisas em livros, dissertações, monografias, teses, artigos, sites da internet, e vários relatórios e documentos da empresa pesquisada. A metodologia aplicada para a análise e solução do problema foi elaborada através do ciclo PDCA e diagrama de causa-efeito. O detalhamento do trabalho, o emprego das técnicas, seu processo de implantação e os resultados obtidos serão descritos nesta dissertação.The flexibility of the production systems became indispensable for the survival of the companies of manufacture in the global market, who stimulated for the increasing advance of the technologies used in the processes, nor always find resonance in the systems of PPCP (planning, programming and control of the production) existing. In this direction, this dissertation display the study of case in a eletroeletrônic company who even though disposing of high technology in your process of manufacture, if came across with the necessity of implementation of techniques that could provide to improvements in the captation and attendance of order with short term of deliveries or placed alterations of placed order. Looking for the flexibilization of production process through new-positioning of the PPCP taking on a more analytical position with the use of new tools of work with had half to act decisively for the attainment of better resulted. No disposing of much time to act, the searched company would have to adopt tools of work of low cost and complexity that could make possible its fast implantation. The kind of fulfilled inquiry was the case study, favored by the participation of the author along the process of study. To produce subsidies for this dissertation inquiry were done in books, dissertations, monographs, theories, articles, sites of the Internet, and several reports and documents of the investigated enterprise. The methodology applied for the analysis and solution of the problem was prepared through the cycle PDCA and diagram of cause-effect. The detailing of the case study, the use of the techniques, your process of implantation and results will be described in this dissertation.
18
Sena, David Custódio de. "Desenvolvimento de um núcleo de simulador de eventos discretos para sistemas de manufatura com visualização 3D." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/18/18145/tde-13072010-112210/.
Abstract:
É crescente a necessidade de se conhecer e controlar o ambiente fabril. Ao longo do século passado e início deste, várias ferramentas e soluções foram desenvolvidas para suprir essa necessidade. Dentre elas, a simulação desempenha um suporte para o apoio da decisão amplamente utilizada principalmente na indústria manufatureira. A realidade virtual pode ser utilizada no ambiente de simulação como um canal de visualização e interação do usuário com o meio simulado. O objetivo deste trabalho é modelar uma biblioteca do núcleo de simulador de eventos discretos para sistemas de manufatura, com visualização tridimensional, que funcione em ambientes imersivos e não-imersivos. Para tal, as abordagens de três fases e orientada a objetos foram utilizadas com algumas alterações. Para a validação desse desenvolvimento, foram feitas duas simulações de um aplicativo que utiliza os elementos básicos de manufatura e foi feita a coleta de seus resultados que possibilitaram a verificação dos objetivos pretendidos. Por fim, foi feita a análise dos resultados e são apresentadas propostas de trabalhos futuros nesta área.The need of knowledge and control of the manufacturing environment is continuously growing. Over the last century and the beginning of this, several tools and procedures were designed in order meet those necessities. Among them, simulation is a decision support tool widely used, mainly in the manufacturing industry. Virtual reality can be used in those simulations for user visualization and interaction with the simulated environment. The aim of this research was to model a library for a discrete event simulator core of a manufacturing system, with 3D visualization, that can be used in immersive and non-immersive environments. Two different approaches have been used: the three phases and the object-oriented one. To validate the software development, two simulations were carried out for an application that uses basic elements of manufacturing and production. Data was collected and analyzed in order to check the accomplishment of the research objectives. Finally, a conclusion about the results is presented along with some proposals for future work in this area.
19
Hala, Filip. "Návrh řízení výrobního procesu." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2013. http://www.nusl.cz/ntk/nusl-223925.
Abstract:
The aim of this diploma thesis is to create and apply a methodology to improve the manufacturing process. Processes for the passage of a contract through the company and activities of the foreman were analyzed. According to this analysis, a methodology was created for continuous improvement of the manufacturing process. This methodology was applied to the data obtained in the analysis. Based on the application of the methodology, actions have been proposed to improve the production process.
20
Mirjalili, Abolfazl. "Scale dependence and renormalon-inspired resummations for some QCD observables." Thesis, Durham University, 2001. http://etheses.dur.ac.uk/3825/.
Abstract:
Since the advent of Quantum Field Theory (QFT) in the late 1940's, perturbation theory has become one of the most successful means of extracting phenomenologically useful information from QFT. In the ever-increasing enthusiasm for new phenomenological predictions, the mechanics of perturbation theory itself have taken a back seat. It is in this light that this thesis aims to investigate some of the more fundamental properties of perturbation theory. In the first part of this thesis, we develop the idea, suggested by C.J.Maxwell, that at any given order of Feynman diagram calculation for a QCD observable all renormalization group (RG)-predictable terms should be resummed to all-orders. This "complete" RG-improvement (CORGI) serves to separate the perturbation series into infinite subsets of terms which when summed are renormalization scheme (RS)-invariant. Crucially all ultraviolet logarithms involving the dimensionful parameter, Q, on which the observable depends are resummed, thereby building the correct Q-dependence. We extend this idea, and show for moments of leptoproduction structure functions that all dependence on the renormahzation and factorization scales disappears provided that all the ultraviolet logarithms involving the physical energy scale Q are completely resummed. The approach is closely related to Grunberg's method of Effective Charges. In the second part, we perform an all-orders resummation of the QCD Adler D-function for the vector correlator, in which the portion of perturbative coefficients containing the leading power of b, the first beta-function coefficient, is resummed to all-orders. To avoid a renormalization scale dependence when we match the resummation to the exactly known next-to-leading order (NLO), and next-NLO (NNLO) results, we employ the Complete Renormalization Group Improvement (CORGI) approach , removing all dependence on the renormalization scale. We can also obtain fixed-order CORGI results. Including suitable weight-functions we can numerically integrate these results for the D-function in the complex energy plane to obtain so-called "contour-improved" results for the ratio R and its tau decay analogue Rr. We use the difference between the all-orders and fixed-order (NNLO) results to estimate the uncertainty in αs(M2/z) extracted from Rr measurements, and find αs(M2/z) = 0.120±0.002. We also estimate the corresponding uncertainty in a{Ml) arising from hadronic corrections by considering the uncertainty in R(s), in the low-energy region, and compare with other estimates. Analogous resummations are also given for the scalar correlator. As an adjunct to these studies we show how fixed-order contour-improved results can be obtained analytically in closed form at the two-loop level in terms of the Lambert W-function and hypergeometric functions.
21
Nejdlová, Anna. "Štíhlé řízení výrobního systému." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2020. http://www.nusl.cz/ntk/nusl-416791.
Abstract:
This thesis is focused on lean management of the production system in the company ASSA ABLOY Czech & Slovakia s. r. o. The main outcome is the proposal of a new layout and process balancing with the use of lean manufacturing methods. The first part describes the theoretical basics which are used for analysis afterwards. The results of these analyses are then used as a main basis for the proposal of changes in the chosen part of the production process.
22
Kathe, Mandar V. "Iron-Based Chemical Looping Gasification Technologies for Flexible Syngas Production from Fossil Fuels with Carbon-di-oxide Capture: Process Systems Simulations, Techno-Economic Analysis." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1460460186.
23
Byerley, Andrew. "Becoming Jinja : The Production of Space and Making of Place in an African Industrial Town." Doctoral thesis, Stockholm : Department of Human Geography, Stockholm University, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-620.
24
Nghiem, Xuan Son [Verfasser], Günter [Akademischer Betreuer] Wozny, and Jens-Uwe [Akademischer Betreuer] Repke. "Ethylene production by oxidative coupling of Methane : new process fow diagram based on adsorptive separation / Xuan Son Nghiem. Gutachter: Günter Wozny ; Jens-Uwe Repke. Betreuer: Günter Wozny." Berlin : Technische Universität Berlin, 2014. http://d-nb.info/1065669674/34.
25
BELFIORE, Giuseppina. "Analisi degli strumenti e proposta di un modello per l'ottimizzazione del flusso dei materiali: un caso aziendale." Doctoral thesis, Università degli studi di Cassino, 2021. http://hdl.handle.net/11580/83985.
Abstract:
Il lavoro di tesi, svolto durante il triennio di dottorato, riguarda un’attività di ricerca
sull’analisi degli strumenti e delle metodologie impiegate per il flusso dei materiali
negli impianti industriali, proponendo un nuovo modello per l’ottimizzazione dei flussi
dei materiali. Il modello proposto è stato validato, applicandolo ad una realtà
produttiva del settore metalmeccanico. Partendo da una fase di studio e analisi della
letteratura esistente sull’argomento, è emerso un nuovo strumento, poco conosciuto,
denominato Waste Identification Diagram (WID) per la gestione dei flussi aziendali e
la riduzione degli sprechi (MUDA). Tale strumento è stato messo a confronto con il
tool che risulta maggiormente utilizzato all’interno di varie realtà produttive: la Value
Stream Map. Dal confronto delle due metodologie è nata la proposta di uno strumento
innovativo, a cui è stato dato il nome di Waste Identification Map, utile per la
rappresentazione del layout attuale o futuro di un processo. La metodologia proposta
è stata quindi applicata ad un caso pratico, analizzando il Work In Progress e
identificando gli sprechi relativi alla gestione del flusso dei materiali di un’azienda e
individuando delle opportunità di miglioramento.
26
Júnior, Jorge Paulo Cabral. "Recursos energéticos distribuídos numa rede elétrica: um estudo de caso." Master's thesis, Instituto Politécnico de Setúbal. Escola Superior de Tecnologia de Setúbal, 2019. http://hdl.handle.net/10400.26/31356.
Abstract:
Dissertação do Mestrado em Engenharia Eletrotécnica e de Computadores - Ramo de Energias Renováveis e Sistemas de PotênciaA redução das emissões de CO2 na atmosfera, requer apostas em soluções sustentáveis, sendo uma delas a integração de energias renováveis variáveis (ERV) na rede. A transição para sistemas em que existe forte penetração de ERV, exige o aumento de flexibilidade do sistema elétrico. Um dos requisitos para garantir essa flexibilidade, é o armazenamento de energia. O armazenamento de energia permite mitigar vários problemas na rede, entre eles, a duck curve. Foi realizado o estudo sobre o impacto do armazenamento no diagrama de carga da subestação São João, em Coimbra, na presença de geração fotovoltaica e eólica. Os resultados obtidos permitiram concluir que o armazenamento de energia, é um requisito necessário para que o sistema elétrico tenha flexibilidade, após a penetração da geração fotovoltaica distribuída. O armazenamento através da geração eólica na rede, pode auxiliar na redução da rampa do consumo durante o final do dia. Com este método, foi possível diminuir o efeito duck curve, através do peak shaving. A maioria da energia eólica armazenada foi durante o dia, em que existe consumo reduzido na rede, devido à massiva geração fotovoltaica. Quanto maior for a geração eólica, nos períodos de baixo consumo, maior é a necessidade do armazenamento.
The reduction of carbon pollutions requires betting on sustainable solutions, one of them is the integration of variable renewable energies (VRE) in the grid. The transition to systems where there is a higher penetration of VRE, requires increased power system flexibility. One of the requirements to ensure this flexibility is energy storage. Energy storage enables mitigate several problems on the grid, including the duck curve. The study of the impact of storage on the load diagram of the São João substation, in Coimbra, in the presence of photovoltaic and wind production was carried out. The results obtained allowed to conclude that the storage of energy, is a necessary requirement for the electrical system to have flexibility, after integration of distributed photovoltaic production. Wind production and storage system can help reduce the ramp consumption during the end of the day, where there is no photovoltaic production. It was possible to decrease the effect caused by duck curve, through peak shaving. Most of the wind energy stored was during the day, when the consumption in the grid is low, due massive photovoltaic production. Increased wind production requires increased storage capacity.
27
Belsito, Danielle L. "Application of Computational Thermodynamic and Solidification Kinetics to Cold Sprayable Powder Alloy Design." Digital WPI, 2014. https://digitalcommons.wpi.edu/etd-dissertations/28.
Abstract:
Military aircraft that require high maneuverability, durability, ballistic protection, reparability, and energy efficiency require structural alloys with low density, high toughness, and high strength. Also, repairs to these aircraft demand a production process that has the flexibility to be relatively in-situ with the same high-performance output. Materials produced by the cold spray process, a thermo-mechanical powder consolidation technique, meet many of the requirements. In accordance with President Obama’s 2011 Materials Genome Initiative, the focus of this effort is to design customized aluminum alloy powders which exploit the unique behavior and properties of the materials created by the cold spray process. Analytical and computational models are used to customize microchemistry, thermal conditioning, and solidification behavior of the powders by predicting equilibrium and non-equilibrium microstructure and resulting materials properties and performance. Thermodynamic, kinetic, and solidification models are used, including commercial software packages Thermo-Calc, Pandat™, and JMatPro®, and TC-PRISMA. Predicted powder properties can be used as input into a cold spray process impact model to determine the consolidated materials’ properties. Mechanical properties of powder particles are predicted as a function of powder particle diameter and are compared to experimental results.
28
Picka, Jaromír. "Sběr a zpracování dat pro statistické metody řízení výroby ABB." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-221151.
Abstract:
Master’s thesis is point to the innovation the data collecting of testing machine of selective circuit breakers. New solution of data collection don’t affect the operations of testing machine. The cost calculation of new solution is included. Master’s thesis also included program solution of SPC methods and application of it to the process of testing the selective circuit breakers.
29
Iskenderoglu, Yasemin. "An Inquiry Into The Design Potentials Of Le Corbusier'." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12611101/index.pdf.
Abstract:
The thesis studies Le Corbusier&rsquos Dom-ino clusters. It is a research in the field of architectural design. The aim is to explore and reveal the architectural potentials of Le Corbusier&rsquo
s mass-producible Dom-ino frame (1914), not only by concentrating on a single Dom-ino unit but by focusing mainly to the clusters of Dom-ino, searching for the logic behind their multiplication, how they come together and to what extent the units allow variety. To achieve this, six alternative Dom-ino clusters are analyzed, and alternative Dom-ino units are explored, other than the well-known single one. Today, Dom-ino is argued as an architectural diagram, and this research reinforces this argument. The analysis of both the clusters and the units with different plan types eventually puts forward that the Dom-ino frame identifies and exploits all the potentials of mass-production with the standardization of the elements and modularity of the structural grid
and it is an adaptable, flexible and consequently a generic frame that produces infinitely alternative solutions. For this reason, this thesis argues that resolving the way Dom-ino units come together, and analyzing how and in what scale they allow variety in producing clusters will introduce the tools for proper mass-housing, and consequently could produce solutions for today'
s mass-housing problems.
30
Ftáčnik, Peter. "Modelování rizik výrobních procesů." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241323.
Abstract:
The processes and procedures covered the main core of the professional operations in the manufacturing plant. The enterprise should focus on the efficient running of the main processes and risks associated with these procedures. My thesis deals with the risk analysis of selected manufacturing processes particular company from qualitative and quantitative point of view. First, the results are presented from qualitative risk analysis, especially in scope of failures of the machines or in the sequences of production. Second part focus on the problems of optimization sequence batches that the total time required for pre-setting of machines between doses should be minimal. The thesis also takes random waiting period into the consideration and applies wait-and-see approach of stochaistic programming applied in task traveling salesman. Calculations are processed by the GAMS. The results from the GAMS are refered in MS Excel, they are further discussed and interpreted by using descriptive statistics.
31
Nguyen, Quan Van, and Nam Cao Nguyen. "Systems thinking methodology in researching the impacts of climate change on livestock industry." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-126825.
Abstract:
The impacts of climate change on livestock production are complex problems, existing in the rela-tionship among this sector and others sectors such as environmental, social, economic and political systems. The complexity and dynamic of these impacts cannot be solved simply in isolation with the linear approach. A system thinking methodology is introduced in this paper to understand the impacts of climate change on livestock production, and identify effective interventions strategies to address this systemic problem. System thinking is a way of thinking about the world and relationships which has been developed far along way in the past. Today, systems thinking has become increasingly popular because it provides a \'new way of thinking\' to understand and manage complex problems, whether they rest within a local or global context. While four levels of thinking is a fundamental tool to identify systemic problems, Causal Loop Diagram (CLD) is a visual tool created by a computer program to illustrate the whole picture of climate change impacts. CLD consist of feedbacks for system, which help strategists identify appropriate intervention strategies in solving the systemic problemẢnh hưởng của biến đổi khí hậu đến ngành chăn nuôi là một trong những vấn đề phức tạp, bởi mối quan hệ chặt chẽ có hệ thống của chúng với các lĩnh vực khác như môi trường, xã hội, kinh tế và chính trị. Những tác động phức tạp đa chiều này không thể giải quyết đơn thuần bằng các giải pháp mang tính đơn lẻ. Phương pháp tư duy hệ thống được giới thiệu trong bài này cho phép hiểu đầy đủ, có hệ thống các tác động của biến đổi khí hậu đến ngành chăn nuôi, đồng thời xác định được những giải pháp chiến lược phù hợp để giải quyết vấn đề mang tính hệ thống này. Tư duy hệ thống là cách tư duy và tiếp cận với sự vật, hiện tượng khách quan, và các mối quan hệ của chúng, phương pháp này đã được nghiên cứu và phát triển từ xa xưa. Ngày nay, tư duy hệ thống đang được ứng dụng phổ biến và rộng rãi hơn trong các nghiên cứu phát triển bền vững vì phương pháp này cung cấp một “tư duy mới” để hiểu và quản lý được các vấn đề phức tạp, dù chúng ở qui mô địa phương hay trên phạm vi toàn cầu. Trong đó, bốn cấp bậc của tư duy là công cụ cơ bản để nhận biết các vấn đề phức tạp, và sơ đồ các vòng tròn tác động (CLD) là công cụ trực quan được xây dựng bằng phần mềm máy tính để chỉ ra bức tranh toàn cảnh các tác động của biến đổi khí hậu. Các vòng tròn tác động này phản ánh các diễn biến thực tế và các thông tin giúp cho việc xác định các giải pháp chiến lược
32
Henry, Guillaume. "Dimensionnement et étude expérimentale d’un vaporiseur à milli-canaux." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0130.
Abstract:
La récente prise de conscience écologique du monde de l’industrie s’est concrétisée dans le domaine de l’automobile par le développement de véhicules moins polluants utilisant l’hydrogène comme carburant. Le déploiement des tels véhicules roulant à l’hydrogène ne peut se faire qu’avec la création d’un réseau de distribution couvrant les besoins des futurs utilisateurs. Air Liquide, dans sa démarche répondre à la demande de la mobilité hydrogène, s’est fixé pour objectif au travers du projet FAIR de concevoir une unité mobile de production d’hydrogène utilisant un procédé de vaporeformage du méthane intensifié. Au sein de ce procédé, il est nécessaire de produire de la vapeur d’eau, la question de l’intensification de la vaporisation de l’eau s’est donc posée. Afin d’y répondre, un banc de test expérimental et un module de vaporisation ont été dimensionnés, assemblés et instrumentés au sein du Laboratoire Réactions et Génie des Procédés (LRGP) à Nancy. Le banc est conçu pour vaporiser de l’eau grâce à une convection d’huile chaude. Le module de vaporisation étudié est un échangeur milli-structuré à plaques en inox possédant une vitre de visualisation permettant l’enregistrement de films à haute-fréquence de l’écoulement d’eau bouillant. Quatre plaques ont été testées : deux plaques sur lesquelles 10 canaux droits hémicylindriques sont soit fraisés, soit produits par fabrication additive, une plaque avec des canaux de géométries variées et enfin, une plaque où sont gravés sept canaux droits garnis de motif triangulaires. Une nouvelle technique innovante de post-traitement a été développée afin de produire des « Diagrammes Spatio-Temporel » représentant l’évolution spatiale des différentes interfaces liquide-vapeur présentes dans les canaux au cours du temps. L’utilisation de ce nouvel outil permet non seulement de déterminer les phénomènes d’ébullition (nucléation spontanée et oscillations du niveau de liquide), de comprendre leur chronologie mais aussi de caractériser les régimes hydrodynamiques présents dans les canaux (régime de bulle, de bouchons de vapeur, churn, annulaire et d’assèchement). Ils permettent également la quantification de grandeurs opératoires telle que la qualité de vapeur locale afin de tracer des cartes de régime. Grâce aux différentes grandeurs opératoires relevées sur le banc, la caractérisation des pertes thermiques du module a été réalisée afin de pouvoir estimer d’une part la qualité de vapeur en sortie de module par un bilan thermique et d’autre part des coefficients de transfert thermique convectif de l’écoulement d’eau à l’équilibre liquide-vapeur. Enfin, une proposition de méthodologie de pré-dimensionnement de vaporiseur milli-structurés produits par fabrication additive est proposée. Elle s’appuie sur deux cas d’études portant sur l’intensification de la vaporisation de l’eau dans une unité mobile et un procédé de taille industrielleThe ever-growing awareness of the impact of human activities on the environment makes industries find environmentally friendly alternatives. In the automotive sector, the development of less polluting cars using hydrogen as fuel is an example. To successfully promote this type of vehicles to people, the providing network of hydrogen has to be set up. To tackle the challenge of this deployment, Air Liquide, through the FAIR project (Additive manufacturing for the intensification of reactors), aims to intensify the Steam Methane Reforming process in order to develop small mobile hydrogen production unit. Inside this process, a particular step, the water vaporisation, has to be intensified. To study this intensification, an experimental test bench and a vaporisation module are sized, assembled and instrumented in the Reactions and Chemical Engineering Laboratory (LRGP) in Nancy. The test bench uses a hot oil convection to vaporise the water. The vaporisation module, designed as a milli-structured plate heat-exchanger, has a window enabling the visualisation and the recording of the boiling water hydrodynamics with a high-speed camera. Four milli-structured plates are tested: two of them have 10 semi-circular straight channels either mechanically engraved of made by additive manufacturing, the third plate has various shapes of engraved channels and finally the fourth plate has 7 engraved straight channels with triangular cavities. An innovative method for the post-treatment of high-speed videos is developed in order to produce Spatio-Temporal Diagrams (DST) showing the spatial evolution of liquid-vapor interfaces by the time inside a channel. The exploitation of this new tool enables the determination and the description of boiling phenomena (spontaneous bubble nucleation, liquid oscillations), the understanding of the boiling events chronology and the characterisation of flow regimes (bubbly, slug, churn, annular flow and dry out of the channel). Moreover, a quantitative exploitation of the DST is possible such as the local vapor quality needed for the drawing of flow regime map. Thanks to the measurement of various operating data on the test bench, the characterisation of the heat losses is done in order to assess the vapor quality of the water flow outgoing the vaporiser by a heat balance. The two-phase heat-transfer coefficients are also assessed. Finally, a methodology of milli-structured vaporiser made by additive manufacturing pre-sizing is put forward. It is based on two case-study on the intensification of water vaporisation in a small mobile hydrogen production unit and in a standard SMR process
33
Talai, Jonas Jones. "Change initiative : How resistance & obstacles can affect organizations: From a blue-collar and manager perspective: a case study of a manufacturing company in Sweden." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-44404.
Abstract:
The global market is very competitive due to fast changes in complex business environments and to survive or expand the business, organizations must embrace organizational change. However, adapting to change is not always easy, where organizations may experience obstacles and resistance along the way. Organizations may also experience that it is very hard to implement lean successfully, due to lack of know-how but especially resistance. The traditional way is to blame the blue-collars for the disturbing circumstances but in modern times the wind has changed its course where the managers themselves can be a contributor for implementation failures. Therefore, the aim of the research is to investigate what advantages that can be obtained by implementing a certain change initiative. Furthermore, to determine where resistance occurs and how to eliminate or reduce them. The change initiative in this research is implemented by conducting a case study in a Small Medium Enterprise (SMEs), where the main goal is to reduce the changeover time of a machine, by finding improvement suggestions using the Single Minute Exchange of Die (SMED) methodology. The results generated several improvement opportunities and gave an indication that there is a huge potential for improvements and elimination of waste during a typical changeover. The positive outcomes of implementing these improvement opportunities could theoretically reduce the changeover time, which directly reduces the overall cost but higher responsiveness, flexibility and efficiency can also be obtained. However, the evidence tells a story where the organization could experience obstacles during the implementation of the improvement suggestions, due to several factors. Surprisingly, the evidence points out that one root problem for resistance is difficulties of describing the underlying reason of the change initiative to the blue-collars. Moreover, there is in fact resistance and lack of awareness of the SMED methodology among the blue-collars and the managers, where fear of the unknown is another root problem for resistance.
34
Baláková, Tereza. "Rizika řízení průběhu zakázky ve vybraném podniku." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2021. http://www.nusl.cz/ntk/nusl-442950.
Abstract:
The diploma thesis deals the risk management during order processing in the engineering company Balák stroje Tišnov Ltd., a producer of custom machines. The aim of the diploma theses is to identify and evaluate the risks that may arise during the order processing. A partial aim is to propose a list of recommendations to minimize the most serious risks. The thesis is divided into three parts, where the first part of the thesis is focused on theoretical basis. The second part – analytical part contains the introduction of the company, the research part, description of the order processing and risks identification and evaluation, using selected methods – FMEA and Ishikawa diagram. The last part contains proposals for mitigating the most serious risks.
35
Matlasová, Monika. "Rizika řízení průběhu zakázky ve vybraném podniku." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2018. http://www.nusl.cz/ntk/nusl-377432.
Abstract:
The diploma thesis deals with the issue of risk management during order processing in the production company, named Slévárna Kuřim, a.s., which produces castings. The first part of the thesis presents the theoretical background. In the practical part, a specific company is introduced, an order processing is described, and all possible risks that may occur during order processing are identified. Their identification is done by using selected tools - the FMEA method and the Ishikawa diagram. The goal of the diploma thesis is to identify possible risks based on performed analysis and for the most serious risks propose measures that would minimize them.
36
Harvey, Martha M. (Martha Mattern). "The Fixed v. Variable Sampling Interval Shewhart X-Bar Control Chart in the Presence of Positively Autocorrelated Data." Thesis, University of North Texas, 1993. https://digital.library.unt.edu/ark:/67531/metadc278763/.
Abstract:
This study uses simulation to examine differences between fixed sampling interval (FSI) and variable sampling interval (VSI) Shewhart X-bar control charts for processes that produce positively autocorrelated data. The influence of sample size (1 and 5), autocorrelation parameter, shift in process mean, and length of time between samples is investigated by comparing average time (ATS) and average number of samples (ANSS) to produce an out of control signal for FSI and VSI Shewhart X-bar charts. These comparisons are conducted in two ways: control chart limits pre-set at ±3σ_x / √n and limits computed from the sampling process. Proper interpretation of the Shewhart X-bar chart requires the assumption that observations are statistically independent; however, process data are often autocorrelated over time. Results of this study indicate that increasing the time between samples decreases the effect of positive autocorrelation between samples. Thus, with sufficient time between samples the assumption of independence is essentially not violated. Samples of size 5 produce a faster signal than samples of size 1 with both the FSI and VSI Shewhart X-bar chart when positive autocorrelation is present. However, samples of size 5 require the same time when the data are independent, indicating that this effect is a result of autocorrelation. This research determined that the VSI Shewhart X-bar chart signals increasingly faster than the corresponding FSI chart as the shift in the process mean increases. If the process is likely to exhibit a large shift in the mean, then the VSI technique is recommended. But the faster signaling time of the VSI chart is undesirable when the process is operating on target. However, if the control limits are estimated from process samples, results show that when the process is in control the ARL for the FSI and the ANSS for the VSI are approximately the same, and exceed the expected value when the limits are fixed.
37
Nam, Kyungdoo T. "A Heuristic Procedure for Specifying Parameters in Neural Network Models for Shewhart X-bar Control Chart Applications." Thesis, University of North Texas, 1993. https://digital.library.unt.edu/ark:/67531/metadc278815/.
Abstract:
This study develops a heuristic procedure for specifying parameters for a neural network configuration (learning rate, momentum, and the number of neurons in a single hidden layer) in Shewhart X-bar control chart applications. Also, this study examines the replicability of the neural network solution when the neural network is retrained several times with different initial weights.
38
Peterka, Zdeněk. "Implementace štíhlé výroby ve výrobním provozu." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2020. http://www.nusl.cz/ntk/nusl-416769.
Abstract:
The aim of this diploma thesis is the practical implementation of lean manufactur-ing elements according to the lean methodology in an engineering company engaged in job production in order to reduce waste and increase production efficiency. At the beginning of the thesis is a presentation of a company that manufactures steam turbines. The following is a short chapter on the background of lean manufactur-ing, focusing on the Kaizen philosophy. The main focus of this thesis is on 3 projects of a practical demonstration of the application of lean manufacturing. The aims are to re-duce waste, streamline production and other individual goals. Each project contains an introduction to the problem, setting its goals, performing a root cause analysis with pro-posing measures to meet the project objectives. The evaluation of the project contains both the achieved benefits as well as the limitations of the provided solution. At the end of this work is an overall evaluation of the financial benefits and costs of individual projects.
39
Pálka, Ladislav. "Postup realizace zavedení informačního systému pro společnost ABC a.s." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2010. http://www.nusl.cz/ntk/nusl-222588.
Abstract:
My diploma theses describe the implementation of the production processes into the current infrastructure respecting the ISO 9001:2001 standards in the company ABC a.s. I analyse the existing structure and record the theoretical bases in my theses. I propose the procedure of implementation production process based on the principals.
40
Hajkrová, Romana. "Postup zavedení výrobního procesu v respektování normy ISO." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2009. http://www.nusl.cz/ntk/nusl-222048.
Abstract:
My diploma theses describe the implementation of the production processes into the current infrastructure respecting the ISO 9001:2001 standards in the company ABC s.r.o. I analyse the existing structure and record the theoretical bases in my theses. I propose the procedure of implementation production process based on the principals.
41
Škrdla, Michal. "Optimalizace pracoviště montáže v předvýrobě za použití principů štíhlé výroby." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241939.
Abstract:
This thesis deals with the current state of assembly workplace for prefabrication in selected company. Using lean manufacturing principles it describes and subsequently eliminating all forms of waste that occur in the workplace. Part of the project is to design a new layout of the manufacturing cell, operation balancing and standardize the work of operators in the process. The project aims to achieve the planned production volumes at the same or lower operating costs.
42
Moudrá, Michaela. "Příprava a řízení stavební zakázky ve stavebním podniku." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240352.
Abstract:
The aim of the thesis is to describe the preparation and management of construction contracts in terms of suppliers. In the thesis there are explained the basic terminology related to the preparation and management of construction contracts in terms of suppliers. The outcome of the thesis is the preparation of construction documentation from the supplier's perspective for the construction contract Agroturistika Kojatín.
43
Pokorný, Pavel. "Využití optimalizace v řízení výroby." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2008. http://www.nusl.cz/ntk/nusl-221771.
Abstract:
The Master’s thesis deals with production scheduling in an industrial company. It uses the means of artificial intelligence to develop an appropriate production schedule in a generalized Flow-shop Programming problem. This problem can be solved by application which is a result of this thesis and was prepaired with use of the software Matlab 7.1 and its Genetic Algorithm and Direct Search toolbox. There is a part devoted to the use of advanced production systems (APS) and the concept of the operative production planning in praxis as well. The thesis pays attention to various optimization models in production scheduling and supply chain management too.
44
Bartoš, Miroslav. "Příprava a řízení stavební zakázky." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227510.
Abstract:
This thesis focuses on the theme of preparation and management of construction work contract in its theoretical and empirical level. Theoretical part deals with the description of contractor’s preparation for construction in the form of supply, pre-production and production preparation. It also deals with the issues of planning in the form of structuring of a building project and its duration, including the description of schedule planning methods. Theoretical part ends with a passage about automated preparation and construction implementation, together with a definition of basic terms concerning private and public procurement. Practical part answers the question of description, analysis and organization of particular construction contract and together with contractor’s administrative treatment of construction preparation meets the appointed target. Closing part consists of a suggestion of methodology for processing contractor’s preparation using Contec software.
45
Eis, Jan. "Řízení stavební zakázky ve stavebním podniku." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-225961.
Abstract:
The master's thesis describe system of management construction project and elaboration prize offer from the perspective of contractor of building. Objectiv of this work is to introduce whit specific principles, procedures and methods, that are needed to prepare and management of construction contracts and their subsequen application to specific construction work - new building of locksmith in Chotěboř.
46
Polák, Marek. "Vícepodlažní montovaná konstrukce." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240312.
Abstract:
The final thesis is focused on reworking hospital pavilion from cast-in-place structure to precast concrete frame. Calculation of internal forces is made by software system SCIA Engineer. Main load-bearing elements are inner beam, outside beam and all columns in axis 2-C. This thesis contains assembly report, structural design, calculations and drawings of the designed parts, joint details, assembly material drawing and hand calculation.
47
Maccaferri, Cristian. "Valorization and recycling of raw materials through a waste management system, case of study Koinonia Community, Lusaka, Zambia." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13571/.
Abstract:
This thesis presents the implementation and the optimization of a waste management system (WMS) in the Koinonia community (that is sited in the Chilanga district near Lusaka), showing the challenges that must be faced, implementing a WMS in a developing country. In the first part of the thesis it will be contextualized the waste management in the Zambian economy showing how a diversification involving the it could fit with the needs of the Nation. In the second part it will be treated the waste management hierarchy through the illustration of some European policies (like Circular Economy Package) and best practice (like WtE in Sweden). In the third part it will be analyzed the case of study Koinonia community where it has been spent three month. The object of the study was how to make the waste management system economical sustainable, the various issue regarding this subject are described by some reports wrote at the beginning of the experience and at the end. In addition, the chapter presents a study about the waste production in Chilanga and the data collected by means the interview with the waste aggregator present in the city.
Concluding, it is showed a proposal of evolution of the waste management system which consist in install a phv (Photovoltaic) system that will feed an ecological island of low dimension.
48
Wang, Chien-Fu, and 王建富. "Research of Patent Production– A Case of Diagram Method." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/27a3nf.
Abstract:
碩士國立臺灣科技大學
管理研究所
104
According to the Taiwan Intellectual Property Office 2015 annual report, there are 44,415 invention patent applications, 21,404 new patent applications, 7,808 design patent applications and a total of 73,627 applications that decreased 5.6 percent from last year and domestic applications decreased the most. The study investigates the problem of the decreasing of domestic applications by patent innovation management. The study use “Patent management practices interviews Table” to figure out the understanding of patent management practices from different jobs. Furthermore, the study examine the learning of the Graphic creative techniques for university student which include Mandala Reflections law, patent law matrix effect and mind mapping. The study also examine the public interest in the patent application. The study aims to stimulate leaders and professional managers from most of companies back to view their company's internal patent innovation management model and enhance the number of domestic patent applications in the future. Results of the study reveal the domestic patent applicants need innovation training, and that approved creativity can be trained more sophisticated. Results of the study reveal the creative level of design patent is medium to high, and that approved the creative level of design patent have no degree lower than the new patent. Students from the patent class learn more lively and interesting in patent, and students learn to be prepared before the patent application, the patent search skills is very important to enhance the number of domestic patent applications in the future.
49
Barbosa, Miguel Bonafe. "Desenvolvimento de uma aplicação informática para a criação de Diagramas de Identificação de Desperdícios." Master's thesis, 2015. http://hdl.handle.net/1822/41946.
Abstract:
Dissertação de mestrado em Engenharia IndustrialNo contexto da melhoria contínua é bem famosa a metodologia baseada no VSM (Value Stream Mapping). Nessa metodologia começa-se por descrever o estado atual do fluxo dos materiais de uma determinada família de produtos bem como os principais fluxos de informação usando um VSM. Depois projeta-se um VSM futuro e definem-se as ações necessárias para que esse estado desejado futuro seja atingido. Embora muito popular, o VSM, tem algumas limitações descritas em diversas publicações e apresentadas neste trabalho. Tem vindo a ser desenvolvido no Departamento de Produção e Sistemas da Universidade do Minho uma nova ferramenta, denominada Waste Identification Diagram (WID), para ultrapassar algumas das limitações do VSM. A originalidade do WID advém principalmente da sua forma visual, onde as dimensões dos seus símbolos representam informações relevantes sobre uma unidade de produção. O aspeto mais negativo do WID é a dificuldade de o construir uma vez que não existe uma ferramenta específica para o fazer. A ausência de um software como ferramenta facilitadora capaz de reproduzir esses diagramas, torna-se uma necessidade para que o modelo WID seja de fato uma ferramenta alternativa e muito mais eficaz do que as existentes no mercado, motivando esse trabalho. O objetivo desse trabalho é a criação de um sistema capaz de simplificar e automatizar algumas tarefas no processo de construção de Diagramas de Identificação de Desperdícios (WID). O sistema foi desenvolvido e permite ao utilizador construir rapidamente diagramas WID, permite imprimir e adaptar o WID a diferentes escalas, entre outras importantes funcionalidades.
In the context of continuous improvement a methodology based on Value Stream Mapping (VSM) is very well known. This methodology starts up by describing the current state of the flow of material of any given product family as well as key information flows using a VSM. Then a future VSM is created and a set of the necessary actions is generated so that desired future state is reached. Although very popular, VSM has some limitations described in several publications and presented in this work. The Production and Systems Department of the University of Minho has developed a tool, called Waste Identification Diagram (WID), a VSM competitor, to overcome some of the limitations of VSM. The originality of the WID is mainly coming from its visual form, where the dimensions of the symbols represent relevant information about a production unit. The most negative aspect of WID is that the diagrams are difficult to build because there is not a specific tool to do so. The absence of a software tool as a facilitator able to play these diagrams, it becomes a necessity for the WID model is indeed an alternative tool and more effective than the existing market, motivating this work. The aim of this work is to develop a computer application to build Waste Identification Diagrams (WID). The application was built and allows the user to quickly build WID diagrams, allows you to print and adapt the WID at different scales.
50
Greeff, Lydia. "Investigation into the production optimization of a dry mixing batch plant / Lydia Greeff." Thesis, 2015. http://hdl.handle.net/10394/15270.
Abstract:
This dissertation reports the investigation and combination of optimization methodologies
and the result of implementing them within a production environment.
A literature survey was conducted on the optimization methodologies Lean Manufacturing
and theory of constraints (TOC).
A number of production optimization methodologies were studied and considered for
application to the case study organisation. Due to the small size and relative simplicity of the
operation, these methodologies had to be simplified and combined into a more relevant
form.
A refractory manufacturer was used as a case study for the investigation into the
optimization of the dry batch plant. Lean Manufacturing and TOC are optimization
methodologies that could be employed to optimize the dry batch plant.
Tools from these methodologies were used to investigate problems identified within the
production process that were causing the batching plant to perform non-optimally. A time
and motion study was conducted and a process flow chart was created to understand the
production process. Wasteful activities were identified using a value stream map and a flow
process chart was used to visualise the movement within the production process. A 5-Why
analysis was conducted to determine the root causes.
An optimization plan was created to eliminate the wasteful activities and the operational
measures, that is throughput, inventory and operating expense, were used as to determine
what the effect the optimization plan would have on the wasteful activities (Lean
Manufacturing) found within the batching plant and the organisation.
The results of the combined effect of the optimization plan are discussed focusing on the
improvements in the operational measures and the increase in profit from sales.
Future research is suggested to improve the benchmarking of the optimization plan and any
future improvements that the organisation might implement.MSc (Development and Management Engineering), North-West University, Potchefstroom Campus, 2015