Thèses sur le sujet « Parametric studie »
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1
Chroboček, Michal. « Případové studie pro statistickou analýzu dat ». Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217911.
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This thesis deals with questions which are related to the creation of case studies for statistical data analysis using applied computer technology. The main aim is focused on showing the solution of statistical case studies in the field of electrical engineering. Solved case studies include task, exemplary solution and conclusion. Clarity of explained theory and the results understanding and interpretation is accentuated. This thesis can be used for practical education of applied statistical methods, it’s also supplemented with commented outputs from Minitab. Trial version of Minitab has been used for solution of case studies.
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Irber, Tomáš. « "MRAKODRAP" - architektonická studie výškové stavby u Právnické fakulty Masarykovy univerzity v Brně ». Master's thesis, Vysoké učení technické v Brně. Fakulta architektury, 2010. http://www.nusl.cz/ntk/nusl-215665.
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In this diploma thesis, I have tried to design a high-rise building in Brno and offer new opportunities for built-up areas in a manner that respects the future of urban development. I have applied the principles of nature patterns on the very structure of the building and thus I have reached the perfection of nature, which in my view offers an elegant, simple and already proven solution.
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Obtulovič, Marek. « "MRAKODRAP" - architektonická studie výškové stavby u Právnické fakulty Masarykovy univerzity v Brně ». Master's thesis, Vysoké učení technické v Brně. Fakulta architektury, 2010. http://www.nusl.cz/ntk/nusl-215676.
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In this diploma thesis, I have tried to design a high-rise building in Brno and offer new opportunities for built -up areas in a manner that respects the future of urban development. I have applied the principles of the nature patterns on the very structure of the building and thus I have reached the perfection of nature which in my view offers an elegant, simple and already proven solution.
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Švec, Dalibor. « Výpočtový program pro návrh výměníku tepla ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443201.
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The diploma thesis is focused on creating a calculation software for designing heat exchanger. The software will not calculate one single heat exchanger but will recommend all heat exchangers which meet the requirements. Then, user can decide which heat exchanger is best suited for the specific application and make a comprehensive calculation. Part of the diploma thesis is to verify correctness of the software and make a parametric studies. Parametric studies will be focused on baffle cut, baffle spacing, tube pitch, and tube thickness and its effect on heat transfer and pressure drop.
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Podola, David. « Parametrická studie zařízení pro zpětné získávání tepla ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230445.
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This diploma thesis deals with the impact of changes in operating and geometrical parameters of regenerative heat exchanger on the efficiency of decentralized ventilation units with heat recovery. Decentralized ventilation unit can be used for ventilation of family houses or smaller administration buildings. Output of this work is to determine the efficiency of a particular produced model of decentralized ventilation unit and overview of the possibilities increased efficiency of heat recovery of this units.
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Studený, Vojtěch. « Model zplyňování biomasy ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417530.
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Mathematical models of gasification are suitable for predicting gas composition and its properties. The aim of the diploma thesis is to compile a mathematical model for biomass gasification. The first part deals with the description of gasification and the technologies used. Theoretical part consists of the search of modeling methods. Other theoretical part is devoted to the description of the model and equations presented in the thesis. Part of the assignment is a parametric study that shows changes in gas production and its properties when changing the parameters. Finally, the model is compared with the data obtained in the experiment on the fluid reactor biofluid 2.
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Macháček, Pavel. « Využití zasklené lodžie pro předehřev větracího vzduchu - parametrická studie ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230431.
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This thesis deals with the influence of balcony glazing to preheat ventilation air. In the first part there are described the ways of passive use of sun radiation and types of ventilation of flats. THESEUS-FE 4.0 is used as a simulation program, for which heat transfer is described. The second part contains description of flat and selected case simulation, followed by a geometric model and description of boundary conditions. Finnaly is done evaluation of case simulations not only in therms of savings in ventilation, but also for heat loss as a whole.
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Pastrnková, Markéta. « Návrh konstrukce nové verze vozíku a dokovací stanice pro kanálové regály ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443771.
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The master's thesis deals with the analysis of the current version of the trolley and the docking station of the channel racks and the design of modifications. The theoretical part describes the components of the storage channel system. There is also explained principle of pallet storage in this part. In the following chapter, several variants of the design of the lifting mechanism of the lifting platform are elaborated. The work also presents static structural analysis of the current version of the trolley and docking station, parametric study and topological optimization of one of the components. Static structural analyzes were partially solved in the finite element software RFEM by Dlubal Software s.r.o company, and mainly in the software ANSYS Workbench 2020 R2 by ANSYS, Inc. company.
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Dagdelen, Turgay, et Shaho Ruhani. « Finite Element Analysis of the Dynamic Effect of Soil-Structure Interaction of Portal Frame Bridges - A Parametric Study ». Thesis, KTH, Bro- och stålbyggnad, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231119.
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In Sweden, the railway sector currently faces the challenge of developing its first high-speed railway line, in response to the need to provide faster domestic and international transport alternatives. High-speed train passages on railway bridges can cause resonance in the bridge superstructure, which induce high accelerations that should not exceed the limits stipulated in the current design code. The most common bridge type adopted in Sweden is the portal frame bridge, an integral abutment bridge confined by surrounding soil. The soil possesses inherent material damping and radiation damping that allows energy dissipation of train-induced vibrations. Both the damping and the natural frequency of the soil-structure system influence the acceleration response of the bridge superstructure. Therefore, it is necessary to investigate the effect of soil-structure interaction on portal frame bridges. Within this thesis, a numerical parametric study was performed to gain knowledge of the dynamic effect of the relative deck-abutment stiffness on the soil-structure interaction of portal frame bridges. For four span lengths, three different boundary conditions were analyzed in the form of i) no soil, ii) backfill, and iii) half-space. The analysis was performed on two- and three-dimensional finite element models. The backfill and subsoil were modeled with both direct finite element approach, and with a simplified approach using Kelvin-Voigt models and frequency-dependent impedance functions. Furthermore, time was devoted to investigating the nonlinear compression-only behavior of the interaction between the backfill and the abutments to allow separation. The results presented in the thesis illuminate the essence of including soil-structure interaction in the dynamic analysis as both the modal damping ratio and the natural frequency increased drastically. The effect of backfill on short span bridges has shown to be more prominent on the reduction of the train-induced vibrations. For longer spans, the subsoil proved to be more significant. For the simplified models the modal damping ratios of the different span lengths have been quantified as a logarithmic trend of the first vertical bending mode. Two-dimensional models have been problematic when using plane stress elements due to the sensitivity of the element thickness on the response. Thus, such models are only recommended if validation with corresponding three-dimensional models and/or field measurements are possible. By allowing separation of the soil-structure interface, the effect of contact nonlinearity on the acceleration response has been more suitable with direct finite element approach - in which static effects of the soil are accounted for - contrary to the simplified nonlinear models with compression springs.Järnvägssektorn i Sverige står inför utmaningen att utveckla den första höghastighetsbanan med syftet att erbjuda snabbare inhemska och internationella transportalternativ. Passager av höghastighetståg på järnvägsbroar kan orsaka resonans i brons överbyggnad vilket resulterar i höga accelerationer som inte får överskrida begränsningarna i dimensioneringsnormen. I plattrambroar, vilka är främst förekommande i Sverige, utförs broplattan inspänt i rambenen omslutna av jord. Jorden bidrar utöver styvhet, även med material- och strålningsdämpning där vibrationer i jorden inducerade av tågpassager tillåts dissipera. Accelerationerna i brons överbyggnad påverkas av dämpningen och egenfrekvensen av jord-struktur systemet. Med anledning av detta är det väsentligt att undersöka effeken av jord-struktur interaktionen på plattrambroar. I detta examensarbete har en numerisk parametrisk studie utförts för att erhålla kunskap om effekten av den relativa styvheten av broplattan och rambenen på jord-struktur interaktionen av plattrambroar. Fyra spännvidder har undersökts för tre olika randvillkor där i) ingen jord, ii) motfyllning samt iii) halvrymd har beaktats. Analysen utfördes på två- och tredimensionella finita element modeller. Motfyllningen respektive underliggande jord modellerades med finita element på ett direkt- samt förenklat tillvägagångssätt där Kelvin-Voigt modeller och frekvensberoende impedansfunktioner användes. Mellan motfyllningen och rambenen har separation tillåtits där det icke-linjära förhållandet av interaktionen undersöktes med tryckbeteenden för fjädrarna. Resultaten belyser vikten av att inkludera jord-struktur interaktionen i dynamiska analyser p.g.a. ökningen den medför för den modala dämpningen och egenfrekvensen. För korta spännvidder, påvisades det att effekten av motfyllningen var mer framstående för reduktionen av vibrationerna orsakade av tåg. För längre spännvidder framgick det däremot att underjorden hade en större påverkan. Effekten av jord-struktur interaktionen på spännvidderna kvantifierades som ett logaritmiskt samband för den modala dämpningen av första vertikala böjmoden. Tvådimensionella modeller har varit problematiska när plana spänningselement användes p.g.a. känsligheten i responsen orsakad av variationer i elementtjockleken. Därav rekommenderas tvådimensionella modeller endast om validering mot tredimensionella eller fältmätningar är möjliga. När separation tilläts i gränsytan av jord-struktur interaktionen, visade det sig att direkt tillvägagångssätt med finita element var mer lämplig med hänsyn till det icke-linjära kontaktbeteendet. Detta eftersom de statiska effekterna av jorden påverkade accelerationsresponsen markant. De statiska effekterna har inte varit möjliga att simulera i dem förenklade icke-linjära modeller med tryckfjädrar.
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Dostal, Vojtěch. « Návrh topologie kompozitního piezokeramického snímače ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-418189.
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This master thesis deals with design and numerical modelling of piezoceramic sensor, which is placed on a rail, in order to generate electrical energy, which can be used for wireless monitoring of railway traffic and to monitor the condition of the railway. The thesis is divided into three parts. Theoretically background of piezoelectric energy harvesting is described in first part, where some previous application of piezoelectric generator in railway area are shown. In the second part, parametric analysis of numerical model is performed, which directly leads to finding best location on a rail, where piezoelectric generator should be placed. For this analysis the homogenized model of MFC sensor was used. Results of the numerical model were then compared with the results of the conducted experiment. The third part presented own design of piezoceramic sensor, which is placed onto most suitable location on a rail. Results from numerical analysis shown eligibility of using piezoceramic sensor to monitor the railway traffic.
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Lesiário, Ana. « Parametric Studies on UAV Flying Qualities ». Thesis, KTH, Reglerteknik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105898.
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When developing an aircraft, one of several important aspects is to predict and properly design the dynamic behaviour of the aircraft. This holds for manned aircraft as well as for UAVs. The optimal dynamic behaviour for an aircraft depends on the mission or purpose: for a certain use an aircraft should be agile, other may require a more stable one. In aeronautics, the properties that describe the aircraft ecacy with respect to some task are known as ying qualities, and our goal is to study their dependence on some design parameters. As a test model we use an existing UAV. After deriving its 6-DOF dynamic model and assessing its baseline characteristics, we perform parametric studies. The strategy followed is divided in two steps: the rst consists on analyzing ying qualities sensitivity to changes in model parameters. The second step studies how specific design changes affect model parameters. Because the rst step only depends on the dynamic model form, we verify, by testing two other dierent aircrafts, that conclusions drawn from this step are valid to other congurations. Finally we show how results from parametric studies can be used to improve the UAV ying qualities regarding a certain mission, through the introduction of slight modications on baseline design.
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Ericson, Noa. « Tillbyggnad vid Nationalmuseum : Parametrisk studie ». Thesis, KTH, Arkitektur, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-122575.
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Tillbyggnad Nationalmuseum Kontext och form Jag ville förhålla mig fritt i utformningen av en tillbyggnad till Nationalmuseum. Muséet är pampigt och behöver kontraster snarare än likhet. Platsen utmärker sig dels i att den är nästan plan och att den är kraftigt skuggad av NM och Lydmar hotell under framförallt vintermånaderna. Tomten har även stora träd som stäcker sig över NM och ger platsen uttryck. Så jag ville arbeta vidare parametriskt med dessa platsbundna element. Det första steget var att definiera en volymgräns som samspelar med platsens träd och byggnader. Även att skapa positiva uterum för människor. Solen bör ha tillgång till alla husets inre delar, och detta skapar smala volymer. Så jag lät den yttre gräns skjuta upp och skar sedan den med hjälp av viktiga lågpunkter i solens kurva under framförallt vinterhalvåret. Dessa skärningar förhåller sig till omkringliggande byggnader och garanterar maximal soltid under viktiga tidpunkter under året. Vissa tider under året skuggas platsen kraftigt av NM då kan de korrelerande volymerna vara högre. På så sätt skapades volymen tak efter solens skärningar på plastsen. Det hexagonala gridet passade bra till volymen och innebar små förändringar på naturens förutsättningar. Byggnaden består av ”in situ” betong skivor som bär bjälklag och tak. De lätta panelfasaderna består av ett stålgrid som bärs av pelarburna golvbjälklag. Innerväggar och takbjälkar är av limträ.Addition to the National museum in Stockholm – Bachelor project KTH Architecture Noa EricsonThe museum built in the late 19th century has not been through many major changes during the decades. Apart from having been made dark on the inside for the security of the art. And an additional building proven now to be too small.The new plan is to open the shades and move the administrative functions to a new building on the back of the museum. An investigation suggested an underground solution for the art storage and I embraced that strategy separating my building from the museum.The design process had its origin in the surrounding buildings and the positive spaces they create. The new footprint of the building should inspire people to use them as a natural part of the landscape. After establishing a footprint I used Professor Ralph Knowles solar envelope design methodology for the volume of my building. The impact from my building should be light in the solar landscape. The next step was to find a grid system supporting my shape, and then dividing it down to a triangle. So with the hexagonal primal grid I built the plans and facades. Not being a slave under the grid but using it as a guideline did help speed up the design process. The building has a clear division between public and museum functions. A café and an big conference room acts as public spaces while the other functions are found mirrored above and below. The building has many flows of people and art that need to be catered for as streamlined as possible. Therefore a majority of the design work took place at the drawing table with plans and flow charts.In the presentation I was striving to achieve accurate descriptions in model drawing and computer representation. A complex task which inspired me to combine the laser cutter with traditional aquarelle techniques. And building a 1:100 model took me on a journey of understanding the site and its limitations.
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Shaltot, Mohamed Mahrous. « Parametric availability studies for the global positioning system ». Ohio : Ohio University, 1993. http://www.ohiolink.edu/etd/view.cgi?ohiou1175882765.
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Lepore, Marino. « Parametric and neurological studies of brain stimulation reward ». Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41660.
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This thesis explored whether interpretations of the reinforcing effect of stimulation trains used in the self-administration of brain-stimulation (SABS) paradigm were artifacts of the reinforcement schedule chosen or whether it represented a genuine attempt by animals to maintain optimal levels of reward. Results demonstrate that stimulation trains used in SABS are reinforcing and that animals regulate pulse frequency to optimize the level of reward. The thesis then explored whether pedunculopontine tegmental nucleus (PPTg) lesions blocked the acquisition or maintenance of SABS, and the acquisition of eight-arm radial maze learning. Results showed that lesions confined to the PPTg block acquisition and maintenance of SABS, suggesting that the PPTg mediates the positive reinforcing effects of BSR. Further, PPTg lesions blocked win-shift and win-stay radial maze learning. However, results indicate that animals were not impaired in "shifting" or "staying" behavior. It is speculated that PPTg lesions block the reinforcing effects of food, which produce inefficient performance on both memory tasks.
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Cunningham, Stanley. « Parametric studies of the dynamic stability of submersibles ». Thesis, Monterey, California. Naval Postgraduate School, 1994. http://hdl.handle.net/10945/30890.
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This thesis analyzes the dynamic stability of submersible vehicles in motions in six degrees of freedom. A continuation algorithm is used in order to obtain the steady state solutions in terms of dive plane angle, rudder angle, and longitudinal separation of centers of gravity/buoyancy. The equations of motion are
then linearized in the vicinity of the above stated nominal point. The eigenvalues of the linearized system indicate the degree of stability of the nominal motion. The results demonstrate the stabilizing or destabilizing effects of general three dimensional motions as opposed to the traditional use of straight line level flight paths. Recommendations for robust design of control laws for commanded paths in combined horizontal vertical planes are provided.
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Beckett, Carolyn. « Studies of acoustic scattering using a parametric array ». Thesis, University of Bath, 1992. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332293.
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Sušovský, Martin. « Parametrická studie výměníku tepla pomocí CFD ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417779.
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In this paper is carried out basic design and calculation of tube heat exchanger with a straight tube bundle with installed systém of disk and doughnut baffles. The calculation included pressure losses and heat transfer coefficient of tubular space and shell side. Then CFD model was made for parametric study, which was focused on influence of change of the baffles geometry on the heat output of the exchanger and the pressure loses on the shell side.
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Hajn, Jakub. « Parametrická studie chování konstrukce vinného sklepa ». Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226361.
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In traditional wine village Bořetice recently occurred to serious disturbances on structures of wine cellars. These failures were caused by, among other things, changes in the properties of the rock environment. This work focuses on the implementation of parametric studies in terms of changing the properties of rock (soil) from the viewpoint of structural arrangement of the wine cellar.
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Hoare, Armando. « Parametric, non-parametric and statistical modeling of stony coral reef data ». [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002470.
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Oztin, Elif Z. « Parametric Studies On Cell Flotation Of Mazidagi Phosphate Rock ». Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/2/1091602/index.pdf.
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Phosphate is one of the essential minerals for all living organisms. It has to be supplied to the soil in order for plant growth. In Turkey, most of the soils lack phosphate mineral. Although this can be overcome by the use of phosphate fertilizers, in Turkey there are no phosphate mines being utilizedand this brings about the need to import phosphate rock and phosphate fertilizers. The estimated phosphate rock reserve of Turkey is around 300 million tons, but it cannot be utilized since no economical method of upgrading has been proved to work yet. The aim of this study has been two-fold
to determine the effects of several parameters on the cell flotation of Mardin-Mazidagi phosphate rock and to increase the grade of the product above 30% P2O5 content with a reasonable recovery rate, so that it could be used commercially. Phosphate rock upgrading was made by using flotation in a cell. There are many factors affecting the recovery and grade of the product such as, particle size, pulp pH, collector volume, acid and collector conditioning times and temperature. Phosphate rock samples used contained 14% P2O5, 43% CaCO3 and 1% SiO2 with a CaO/P2O5 ratio of 3.1. Due to the low silica content, one-stage flotation was made. In the experiments, effects of the important parameters were tested at constant pulp density (10% solids by weight). Particle sizes were between 53 m and 150 m, while the pH values were kept between 5,0 - 6,5 using amounts of acid within the range of 6 - 19 kg H3PO4/ton of rock. The collector (mixture of kerosene and oleic acid in 1:3 volumetric ratio) was used in the range of 0,6 ml (0,96 kg collector/ton rock) and 5,4 ml (8,64 kg collector/ton rock). Acid and collector conditioning times were changed between 10-110 s and 10-80 s, respectively. The temperature range was between 15-35 °
C. At the end of the parametric studies a grade of 36% P2O5 with a recovery of 93% could be obtained.
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Alkhateeb, Wafa Fouad. « Parametric studies on pattern recognition mechanisms in human vision ». Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/47745.
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Didoszak, Jarema M. « Parametric studies of DDG-81 ship shock trial simulations ». Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Mar%5FDidoszak.pdf.
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Clertant, Matthieu. « Semi-parametric bayesian model, applications in dose finding studies ». Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066230/document.
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Les Phases I sont un domaine des essais cliniques dans lequel les statisticiens ont encore beaucoup à apporter. Depuis trente ans, ce secteur bénéficie d'un intérêt croissant et de nombreuses méthodes ont été proposées pour gérer l'allocation séquentielle des doses aux patients intégrés à l'étude. Durant cette Phase, il s'agit d'évaluer la toxicité, et s'adressant à des patients gravement atteints, il s'agit de maximiser les effets curatifs du traitement dont les retours toxiques sont une conséquence. Parmi une gamme de doses, on cherche à déterminer celle dont la probabilité de toxicité est la plus proche d'un seuil souhaité et fixé par les praticiens cliniques. Cette dose est appelée la MTD (maximum tolerated dose). La situation canonique dans laquelle sont introduites la plupart des méthodes consiste en une gamme de doses finie et ordonnée par probabilité de toxicité croissante. Dans cette thèse, on introduit une modélisation très générale du problème, la SPM (semi-parametric methods), qui recouvre une large classe de méthodes. Cela permet d'aborder des questions transversales aux Phases I. Quels sont les différents comportements asymptotiques souhaitables? La MTD peut-elle être localisée? Comment et dans quelles circonstances? Différentes paramétrisations de la SPM sont proposées et testées par simulations. Les performances obtenues sont comparables, voir supérieures à celles des méthodes les plus éprouvées. Les résultats théoriques sont étendus au cas spécifique de l'ordre partiel. La modélisation de la SPM repose sur un traitement hiérarchique inférentiel de modèles satisfaisant des contraintes linéaires de paramètres inconnus. Les aspects théoriques de cette structure sont décrits dans le cas de lois à supports discrets. Dans cette circonstance, de vastes ensembles de lois peuvent aisément être considérés, cela permettant d'éviter les cas de mauvaises spécificationsPhase I clinical trials is an area in which statisticians have much to contribute. For over 30 years, this field has benefited from increasing interest on the part of statisticians and clinicians alike and several methods have been proposed to manage the sequential inclusion of patients to a study. The main purpose is to evaluate the occurrence of dose limiting toxicities for a selected group of patients with, typically, life threatening disease. The goal is to maximize the potential for therapeutic success in a situation where toxic side effects are inevitable and increase with increasing dose. From a range of given doses, we aim to determine the dose with a rate of toxicity as close as possible to some threshold chosen by the investigators. This dose is called the MTD (maximum tolerated dose). The standard situation is where we have a finite range of doses ordered with respect to the probability of toxicity at each dose. In this thesis we introduce a very general approach to modeling the problem - SPM (semi-parametric methods) - and these include a large class of methods. The viewpoint of SPM allows us to see things in, arguably, more relevant terms and to provide answers to questions such as asymptotic behavior. What kind of behavior should we be aiming for? For instance, can we consistently estimate the MTD? How, and under which conditions? Different parametrizations of SPM are considered and studied theoretically and via simulations. The obtained performances are comparable, and often better, to those of currently established methods. We extend the findings to the case of partial ordering in which more than one drug is under study and we do not necessarily know how all drug pairs are ordered. The SPM model structure leans on a hierarchical set-up whereby certain parameters are linearly constrained. The theoretical aspects of this structure are outlined for the case of distributions with discrete support. In this setting the great majority of laws can be easily considered and this enables us to avoid over restrictive specifications than can results in poor behavior
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Vražina, Lukáš. « Parametrická studie absorpčního prvku zadní části vozidla ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241228.
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In 1995 was published a regulation from RCAR company which determines rules for crash tests in maximum speed of 15 km/h on vehicles lighter than 2,5 ton. The main reason was to reduce costs for car reparation in case of crash in low speed. My diploma thesis is focused on the modifications of deformation part in the car alias absorption part of the vehicle. In the first part of my diploma thesis has been done a research about organisations doing basic car crashes as well as topic focused on nonlinear mechanics and description of explicit FEM. In the second part of my work are settled conditions for crash simulation of a barrier into the car. There is an evaluation of critical force on the stringer. Afterwards the calculating simulation simplified on loading of absorption part and there are some material and form adjustments. In the final part of my diploma thesis is done a result comparison and development of the absorption part.
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Nwi-Mozu, Isaac. « Robustness of Semi-Parametric Survival Model : Simulation Studies and Application to Clinical Data ». Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/etd/3618.
Texte intégralRésumé :
An efficient way of analyzing survival clinical data such as cancer data is a great concern to health experts. In this study, we investigate and propose an efficient way of handling survival clinical data. Simulation studies were conducted to compare performances of various forms of survival model techniques using an R package ``survsim". Models performance was conducted with varying sample sizes as small ($n5000$). For small and mild samples, the performance of the semi-parametric outperform or approximate the performance of the parametric model. However, for large samples, the parametric model outperforms the semi-parametric model. We compared the effectiveness and reliability of our proposed techniques using a real clinical data of mild sample size. Finally, systematic steps on how to model and explain the proposed techniques on real survival clinical data was provided.
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Keller, Ryan A. « Studies of parametric emissions monitoring and DLN combustion NOx formation ». Thesis, Kansas State University, 2011. http://hdl.handle.net/2097/9165.
Texte intégralRésumé :
Master of ScienceDepartment of Mechanical and Nuclear Engineering
Kirby S. Chapman
The increased emissions monitoring requirements of industrial gas turbines have created a demand for less expensive emissions monitoring systems. Typically, emissions monitoring is performed with a Continuous Emissions Monitoring System (CEMS), which monitors emissions by direct sampling of the exhaust gas. An alternative to a CEMS is a system which predicts emissions using easily measured operating parameters. This system is referred to as a Parametric Emissions Monitoring System (PEMS). A review of the literature indicates there is no globally applicable PEMS. Because of this, a PEMS that is applicable to a variety of gas turbine manufacturers and models is desired. The research presented herein includes a literature review of NOx reduction techniques, NOx production mechanisms, current PEMS research, and combustor modeling. Based on this preliminary research, a combustor model based on first-engineering principles was developed to describe the NOx formation process and relate NOx emissions to combustion turbine operating parameters. A review of available literature indicates that lean-premixed combustion is the most widely-used NOx reduction design strategy, so the model is based on this type of combustion system. A review of the NOx formation processes revealed four well-recognized NOx formation mechanisms: the Zeldovich, prompt, nitrous oxide, and fuel-bound nitrogen mechanisms. In lean-premixed combustion, the Zeldovich and nitrous oxide mechanisms dominate the NOx formation. This research focuses on combustion modeling including the Zeldovich mechanism for NOx formation. The combustor model is based on the Siemens SGT-200 combustion turbine and consists of a series of well-stirred reactors. Results show that the calculated NOx is on the same order of magnitude, but less than the NOx measured in field tests. These results are expected because the NOx calculation was based only on the Zeldovich mechanism, and the literature shows that significant NOx is formed through the nitrous oxide mechanism. The model also shows appropriate trends of NOx with respect to various operating parameters including equivalence ratio, ambient temperature, humidity, and atmospheric pressure. Model refinements are suggested with the ultimate goal being integration of the model into a PEMS.
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Hussein, Ahmed A. « Simulation Studies of Parametric Processes Associated with Ionospheric Electromagnetic Radiation ». Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30733.
Texte intégralRésumé :
Parametric instability processes are thought to produce Stimulated Electromagnetic Emissions (SEE) during ionospheric heating experiments. The phenomenon is primarily attributed to plasma turbulence excited by the high frequency HF heater in the altitude region where the pump frequency ω₀ is near the plasma upper hybrid frequency ωuh. In this study, parametric instability processes thought to produce SEE are studied using theoretical and electrostatic Particle-In-Cell PIC simulation models. The simulation plasma is driven with a uniform oscillating electric field directed nearly perpendicular to the background geomagnetic field {B} to consider interactions when ωuh is near electron cyclotron harmonics nΩce. The pump frequency and amplitude are varied to consider the effects on the simulation electric field power spectrum.
In this study, theoretical predictions and numerical simulations are used to study the three-wave decay instability process thought to be responsible for the generation of the down-shifted sidebands, the downshifted peak DP and the downshifted maximum DM. In particular, the lower hybrid decay instability LHDI and the ion cyclotron decay instability ICDI are studied in detail. The theory is used to provide the angular regime, with respect to the direction perpendicular to the magnetic field, at which the sidebands develop as well as the frequency and wavenumber regimes of both the LHDI and the ICDI. The effect of the temperature ratio Te/Ti for both instabilities is discussed. A comparison between the theoretical predictions, the simulation electric field power spectrum and the experimental observations are presented in this study. Time evolution of both the LHDI and the ICDI is also investigated. The theoretical predictions are also used to investigate the cascading of the LHDI and the ICDI. The spectra show consistencies with the experimental observations.
A four-wave parametric decay instability process thought to be responsible for SEE broad up-shifted sideband spectral features is discussed as well. Many theoretical results are presented, in which the effect of stepping the heater frequency closer to the upper hybrid frequency on the angle of maximum growth θmax, the growth rate γ and on both the frequency and wavenumber regimes of the four-wave process is investigated. The simulation electric field power spectrum showed a large amplitude up-shifted sideband and a much smaller amplitude down-shifted sideband, consistent with the experimental observations. Comparisons between the theoretical predictions, the simulation electric field power spectrum and the experimental observations are discussed in detail. The time evolution of the four-wave process is one important aspect that is also presented in this study. The development of density irregularities, cavities and particle heating is also analyzed and investigated in this study.Ph. D.
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Villanueva, Evelyn. « Risk assessment of rock surface spillway erosion using parametric studies ». Master's thesis, Mississippi State : Mississippi State University, 2007. http://library.msstate.edu/etd/show.asp?etd=etd-07022007-155027.
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Anders, Olsson. « Energiprestanda för småhus : Parametrisk studie i IDA ICE ». Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-85658.
Texte intégralRésumé :
Sektorn bostäder och service står för cirka fyrtio procent av Sveriges totala energianvändning. Bostadsbeståndet innefattar en stor del småhus, därmed är en reducering av energianvändningen från småhus av stor vikt för att minska klimatpåverkan från sektorn. Den största potentialen för att reducera klimatpåverkan från en byggnads livscykel är att i ett tidigt skede åtgärda och ta hänsyn till energi- och klimatfrågor vid projektering. Därmed är hög energiprestanda som mått på energieffektivitet av yttersta vikt för att projektera småhus med lägre energianvändning. Det övergripande syftet med denna studie är att bidra med kunskaper om byggnadstekniska åtgärder och val som krävs för att bygga energieffektiva småhus. Studien har utförts med en parametrisk studie i simuleringsprogrammet IDA ICE och handberäkningar för att utvärdera hur ett småhus energiprestanda påverkas av ändrade isoleringsdimensioner, reducerade köldbryggor, reducerade U-värden för fönster, olika ytterväggstyper samt geografisk placering. Resultaten av simuleringarna visar att det finns goda förutsättningar för småhusaktörer att påverka energiprestandan. Behovet av värme och den köpta energin kan reduceras genom modifieringar av klimatskalet. Simuleringarna visar att en ökning av isoleringstjockleken i ytterväggen endast innebär en marginell förbättring av husets energiprestanda när referenskonstruktionen redan är relativt välisolerad i plattan och takbjälklaget. Simuleringarna visar däremot att energiprestandan påverkas markant av köldbryggorna då olika indata har testats i IDA ICE. Felmarginalen vid handberäkning av köldbryggor är dock stor så det är problematiskt att få ett representativt värde vid beräkning av dessa utan simuleringsprogram anpassat för köldbryggor. Resultaten av simuleringarna med reducerade U-värden för fönster visade på en marginell minskning av primärenergitalet, eftersom referensbyggnadens fönster redan har relativt bra U-värden och framförallt G-värden. Samt att fönsterarean utgör en relativt låg del av byggnadens totala area. Byggnaden med träregelvägg uppvisade bäst resultat av energiprestanda jämfört med huset av massivträ- och lättregelvägg i simuleringen med olika ytterväggstyper. Detta trots en lägre total väggtjocklek. Simuleringarna med ändrad geografisk position visade på en stor variation av primärenergitalet där Kiruna fick betydligt lägre primärenergital jämfört med referensorten Ängelholm. Resultaten förklaras av att de geografiska justeringsfaktorerna helt eller delvis utjämnar skillnaden mellan klimaten. Resultaten av energisimuleringen visar också att resultaten påverkas till en stor del av den indata och antaganden som användaren av programmet tar ställning till. Exempel på detta kan vara alltifrån antalet brukare som ska förväntas använda huset, till innetemperatur, belysning och annan typ av utrustning. För fortsatta studier föreslås bland annat LCA-kalkyler för byggmaterialen och ekonomiska analyser av förändringar av klimatskärmen.The housing and service sector accounts for about 40 percent of Sweden's total energy use. Thus, a reduction in energy use from housing construction is of great importance in order to reduce the climate impact from the sector. The greatest potential for reducing the climate impact of a building's life cycle is to address and take energy and climate issues into accountat an early stage when designing new single-family homes. Thus, high energy performance as a measure of energy efficiency for detached houses is of utmost importance for designing detached houses with lower energy use.The overall purpose of this study is to contribute knowledge about constructional technical measures and choices required to design energy-efficient detached houses. The study was conducted with a parametric study in the simulation program IDA ICE and manual calculations to evaluate how a detached house's energy performance is affected by changed insulation dimensions, reduced thermal bridges, reduced U-values for windows, different exterior wall types and geographical location.The results of the simulations show that there are good possibilities for detached house owners to influence energy performance. The need for heat and the purchased energy can be reduced through modifications of the climate shield in the house. The simulations show that an increase in the insulation thickness in the exterior wall only affects a marginal improvement of the house's energy performance when the reference structure is already relatively well insulated in the slab and the roof. However, the simulation with reduced thermal bridges has a greater impact. The simulations show that the energy performance is significantly affected by the thermal bridges as various data inputs have been tested in IDA ICE. The margin of error in manual calculations of thermal bridges are complex, so it is problematic to obtain a representative value when calculating these without simulation programs adapted for thermal bridges. The results of the simulations with reduced U-values for windows showed a marginal decrease in the energy performance, since the reference building windows already have relatively good U-values and G-values. And that the window area constitutes a relatively low part of the building's total area.The building with a wooden stud wall showed the best results of energy performance compared to the house of solid wood and light stud wall in the simulation with different exterior wall types. This despite a lower total wall thickness. The simulations with a changed geographical position showed a large variation in the primary energy result, where Kiruna received significantly lower primary energy compared with the reference location Ängelholm. The results are explained by the fact that the geographical adjustment factors completely or partially even out the difference between the climates. The results of the energy simulation also show that the results are affected to a large extent by the input data and assumptions that the user of the program decides on. Examples of this can be from the number of users who are to be expected to use the house, to indoor temperature, lighting and other types of equipment.For further studies, LCA calculations for the building materials and economic analyzes of changes in the climate shield are proposed.
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Walker, Stephen Graham. « Bayesian parametric and nonparametric methods with applications in medical statistics ». Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307519.
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Hai, Socheat Virakraingsei. « Automatic and scalable cloud framework for parametric studies using scientific applications ». Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-307149.
Texte intégralRésumé :
Many scientific applications are computationally expensive and often require a large pool of resources for large scale experiments within a reasonable time frame. With Cloud computing offers a new model of consuming computing infrastructures for their flexible application deployment. At the same time, microservice architecture has also gained momentum in the industries for a number of reasons including minimal overhead, simplicity, flexibility, scalability and resilience. The combination of the two technologies has the potential to bring large benefits for scientists and researchers. The goal of this project is to develop a framework which can help to facilitate researchers and scientists to develop their microservices and to provide a hosting platform for parallel execution of their applications.
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Norbury, A. A. W. « Parametric studies based mechanical and thermal modelling of spot welded joints ». Thesis, Liverpool John Moores University, 2017. http://researchonline.ljmu.ac.uk/5848/.
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This work has focused on formulating a experimental/numerical framework for the investigation of spot weld properties and performance. An Inverse temperature measurement approach has been established to predict the thermal history of a spot welded joints using remote thermocouples. This method incorporated the experimental data into an Artificial Neural Network (AAN) to predict cooling curves of the HAZ. Advanced modelling programs have been developed to simulate spot welded joints and thermocouples. Using the programs to investigate the effects of the key dimensional or material parameters on the mechanical or thermal response of spot welded joints of steels and different thermocouple joints relevant to their applications. Graphical User Interface Abaqus plug-ins of spot welded joints have developed using Python scripting and are used to investigate the effect of nugget size and sheet thickness on the stress and deformation of spot welded joints of steel. These works are important to establish an integrated approach to study the electrical, mechanical and thermal process of the spot welding process.
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Aziz, Ari. « Parametrisk studie av vippningsavstyvande stålbalksbjälklag utförda med I-profiler ». Thesis, KTH, Bro- och stålbyggnad, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-36951.
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Bondsman, Benjamin, Barzan Al et Felix Hedlund. « Dimensionering av höga balkar enligt fackverksanalogi : -En parametrisk studie ». Thesis, Högskolan i Gävle, Energisystem och byggnadsteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-29936.
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Passa, Simone. « Studio cinetico dei parametri di esplosività di bio-polimeri ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
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Il presente elaborato è stato svolto in continuità con un tirocinio effettuato presso un'azienda operante nel settore della bio-plastica. L'obiettivo di questa tesi è la determinazione di alcuni parametri di esplosività per la polvere in esame utilizzando sia un approccio sperimentale che un approccio numerico. I risultati ottenuti con le due metodologie sono stati poi confrontati per capire se il modello cinetico utilizzato è in grado di prevedere il comportamento della sostanza in esame.
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Drbušková, Magdaléna. « Numerická analýza smršťování vybraných silikátových kompozitů ». Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226798.
Texte intégralRésumé :
The thesis is divided into two main parts. In the first theoretical part is described the problems of shrinking including a comparison of Czech standard and Model Code 2010, Vol. 1. The second practical part of the master`s thesis is focused on the numerical analysis shrinkage primarily on the initial stage of this process. The experimentally obtained data are set approximations of the relative deformation using ShrCeC. Subsequently the numerical simulation of shrinkage of selected silicate specimens using a computer applications SpatiDist and FyDiK 2D. The real test specimens are modelled as two-component composite consisting of cement paste and aggregates. The result is a parametric study takes into account the influence of type and size of grain aggregate.
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Henderson, Angus. « Studies of optical parametric oscillators for the ultraviolet and visible spectral regions ». Thesis, University of St Andrews, 1993. http://hdl.handle.net/10023/14951.
Texte intégralRésumé :
The work described herein concerns the characterisation and development of optical parametric oscillators (OPOs) tunable in the ultraviolet, visible and near infrared regions. These devices were pumped by the 308nm output from line-narrowed Xenon Chloride excimer lasers of pulse energy up to 150mJ. The behaviour of Type 2 phase-matched Urea, and Type 1 phase-matched Barium Borate OPOs in terms of oscillation threshold and conversion efficiency, has been explored. The detrimental effects of pump beam walkoff on the threshold of the critically phase-matched Barium Borate OPO have been quantified. It was found that minimum 17ns pulse energies of 5mJ were required to reach threshold in a device based on a crystal of 20mm length. By contrast, noncritically phase-matched Urea OPOs using crystal lengths of 25mm were operated with as little as 0.6mJ pump energy. A deterioration in performance was observed in both cases with decreasing pump beam waist. Maximum pump depletions of 72% and 64% were observed in Urea and BBO respectively. The useful output from the urea device reached 65%, while higher absorption/scattering losses meant that the useful fraction in BBO was very much lower. Two different types of noncollinear phase-matching were studied in the BBO-OPO. The first recorded observation of operation of a Type 1 OPO at crystal angles beyond the degenerate wavelength point was made. The output took the form of two concentric rings and was attributed to simultaneous singly and doubly resonant operation. Finally, single longitudinal mode operation of the BBO-OPO was demonstrated using a dispersive cavity arrangement. The widely varying inherent linewidth of the device required that different strategies be adopted over different wavelength ranges. Encouraging performance in terms of threshold was observed using the dispersive cavity, and the feasibility of using this device as a low-power first stage for an oscillator/amplifier set-up was studied.
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Šandera, Petr. « Studie vlivu parametrů modelu na simulaci pojišťovacího nárazu vozidla ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228587.
Texte intégralRésumé :
The diploma thesis deals with basic test procedures conducted by companies Euro NCAP and RCAR. It focuses mainly on insurance impact and describes the creation of a model, simulation and crash on barrier. Moreover, it explores the influence of change of yield strength, thickness and hardening of material of energy-absorber on simulation of insurance impact, especially the amount of absorbed energy by energy-absorber.
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Cano, Camilo I. « Polyimide Microstructures From Powdered Precursors : Phenomenological and Parametric Studies on Particle Inflation ». Akron, OH : University of Akron, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1123710711.
Texte intégralRésumé :
Dissertation (Ph.D.)--University of Akron, Dept. of Polymer Engineering, 2005."August, 2005." Title from electronic dissertation title page (viewed 09/24/2005) Includes bibliographical references.
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Saha, Chitta Ranjan. « Parametric studies of load transfer mechanism of piles embedded in homogeneous soil ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0018/MQ52654.pdf.
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Ndamuso, N. « Parametric studies of cavitation dependence on hydrocarbon and biodiesel fuel injection flows ». Thesis, City, University of London, 2017. http://openaccess.city.ac.uk/19228/.
Texte intégralRésumé :
The parametric studies investigated the cavitation phenomena occurring in Diesel Fuel Injection Equipment using immersed jets. The studies looked at cavitation from the incipient stage, to the fully developed stage, to leaving the fuel to cavitate for a sustained period of time. The studies were conducted with the aim of understanding the cavitation phenomena occurring inside the Fuel Injection Equipment making use of purposed built continuous flow rigs. The first part investigated the onset of cavitation taking place inside a mechanical 80 bar continuous recirculated flow rig that mimicked the flow inside the injectors spill valves as well as the flow inside the high-pressure pumps spill valves during the first stages of cavitation. High velocity jets of variable concentration were considered, from the incipient stage to the fully developed stage, focusing on the impact that changing the fuel composition has on the jets as well as on the impact it has on the geometrical parameters of the nozzle valves. The rig made use of custom made Acrylic, Brass and Aluminum-steel nozzles of Cylindrical, Hemispherical and Conical geometries respectively. The n-Octane, n-Decane, n-Dodecane, n-Tetradecane and n-Hexadecane mixtures were directed into an optically accessible receiver using single hole injector nozzles of 0.14mm and 0.25 mm hole diameters respectively. Parameters such as the fuel composition, the geometry and the material of the nozzles, as well as the operating conditions of the fuels were looked into where 25 repetitive sets of measurements were completed taking into consideration each parameter respectively. Incipient cavitation was associated with the flow outside of the nozzle and was visually observed at the top of the nozzle hole. Cavitation additionally occurred between the layers of the turbulent high immersed jet flow and the stagnant fluid inside the receiver. The onset of cavitation was obtained using the fuel Upstream Pressure to Downstream Pressure ratio. At the point of onset, the results showed that the Upstream Pressure to Downstream Pressure ratio decreased with the increase of n-Octane percentage in the mixture when considering the Cylindrical and the Hemispherical nozzles. When considering the Conical nozzle on the other hand, the critical Upstream Pressure to Downstream Pressure ratio increased with the increase of n-Octane concentration. The results also showed that the jet length and width increased when varying the diameter of the nozzle hole from 0.14 mm to 0.25 mm. Furthermore, the total Saturated Vapour Pressure increased with the increase in n-Octane concentration, where the increase in the propensity of the flowing fuel through the Cylindrical and Hemispherical nozzles, to cavitate was noted. On the other hand, the propensity of the Conical nozzles to cavitate decreased with the increase in Saturated Vapour Pressure. The second part of the study investigated the sustained hydrodynamic cavitation taking place inside a mechanical 1650 bar continuous recirculated flow rig, mimicking the flow inside the injectors spill valves and high-pressure pumps spill valves at a later stage of cavitation as the fuel was left to cavitate for a longer period of time, leading to the degradation of the fuel due to changes in the fuel’s chemical composition taking place during cavitation. A needleless 0.213 mm single hole diameter Cylindrical nozzle was considered, as the Commercial Diesel fuel, the biofuel Rape Methyl Ester and the Gas to Liquids paraffin blend were left consecutively to cavitate for a period of 30 hours. The volume flow rate was obtained as 1.129 Liter per minutes considering a Discharge Coefficient of 0.8. The results showed that by passing a 405nm laser over the 30 hours period through the cavitated fuel mixtures, a decrease with time of the transmission signal of the laser beam penetrating all tested fuels respectively was noticed. The laser beams experienced a decrease in strength due to the changes in the chemical composition of the fuel as high pressures and high temperatures took place inside the receiver. The effect of heating the fuels overnight inside a modified Water Bath tea urn at 60 degrees Celsius was looked into in order to separate the impact of temperature to the impact of cavitation alone. The effect of subjecting to fuel to cavitation and heating was greater than the effect of subjecting the fuel to heating alone. The Gas to Liquids fuel was visually transparent compared to the commercial Diesel fuel and had the highest laser transmission signal. Of all three fuels, the Commercial Aged Diesel fuel had the lowest laser transmission signal as the impurities inside the fuel changed the chemical composition of the fuel due to sustained hydrodynamic cavitation.
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Funderburk, Joshua A. « Intervention of Performance : Applications of Parametric Studies on Connective Design in Public Interaction ». University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1617109690521955.
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Bisacchi, Lorenzo. « Elettroriduzione selettiva del 5-idrossimetilfurfurale : studio dei parametri di reazione ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19231/.
Texte intégralRésumé :
I processi di riduzione del 5-idrossimetilfurfurale (HMF) sono generalmente condotti mediante processi che utilizzano calore e alte pressioni di H2. Una via alternativa prevede l’applicazione di processi elettrochimici, i quali richiedono condizioni più blande e non necessitano di H2.
Il lavoro di tesi qui presentato si concentra sullo studio della elettoriduzione del 5-idrossimetilfurfurale a 2,5-bis(idrossimetil)furano, tramite l’utilizzo di catalizzatori basati su schiume 3D a cella aperta di Cu, sopra le quali viene depositato Ag tramite elettrodeposizione. La caratterizzazione elettrochimica è stata condotta tramite voltammetrie a scansione lineare fatte in tampone borato 0,5M e in HMF, seguite da cronoamperometrie (CA) e cronopotenziometrie (CP); inoltre sono stati valutati l’effetto dei parametri di reazione, quali concentrazione iniziale di reagente, potenziale applicato e densità di corrente applicata sulla conversione, selettività ed efficienza faradica. Le prove effettuate a due diverse concentrazioni di HMF (0,02M e 0,05M), con potenziale di -1,3V vs SCE, mostrano che all’aumentare della concentrazione di reagente si ha un calo della selettività in BHMF. Mantenendo la concentrazione a 0,05M e variando il potenziale applicato, si è osservato un aumento importante della selettività in BHMF a potenziali meno catodici e un calo della conversione a potenziali più catodici; la prova a -1,25V vs SCE fornisce i migliori risultati, tuttavia il tempo di reazione a questo potenziale è molto elevato, portando ad un netto calo della produttività. All’aumentare della densità di corrente si osserva un aumento della selettività in BHMF e una riduzione della conversione, mentre la FE è stabile.
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Bártová, Denisa. « Využití moderních kompozitních materiálů při návrhu betonových konstrukcí ». Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-409787.
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This diploma thesis deals with the design of FRP reinforced concrete structures. The theoretical part is focused mainly on the punching shear of a flat two way slab according to ACI, fib Bulletin, CSA, and JSCE standards. This thesis also includes a description of the punching shear resistance according to Eurocode 2. FRP reinforcement, its mechanical properties, and their behaviour in time are also described. Next, a parametric study was performed that examines the effects of various parameters on the punching shear resistance according to the standards mentioned above. At the end a non-linear analysis using the ATENA software was performed. The practical part includes a structural design of a flat two way slab. The slab uses a steel reinforcement at the bottom, while the top is reinforced with FRP reinforcement. The punching shear design is also included. In the last chapter the serviceability limit state is checked, specifically the slab long-term deflection. The thesis also includes drawings. All calculations were performed in accordance with Eurocode 2 and fib Bulletin No. 40.
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Pokorná, Jana. « Studie vlivu procesních parametrů při dopředném protlačování na namáhání průtlačnice ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228867.
Texte intégralRésumé :
One of the decisive factors of effective using of forward extrusion technology is lifetime of forming tools. Die is very loaded forming tool which loading and therewith related lifetime can be significantly affected by its construction. Construction also affected quality of extruded material. Finete element method allows to simulate this process and assess force which is needed to extrusion and state of stress in die and extruded material. Numerical simulation was realized in program ANSYS 11.0. Influence of reduction, angle of reduction, lenght of extruded material, rounding transition of die parts, extruded material and friction coefficient on die loading and emergence of cracks in extruded material was set in this diploma thesis. Results can be used to die construction optimalization.
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Stinton, Graham William. « Structural studies into AM(_2)O(_7) framework materials and parametric Rietveld refinement ». Thesis, Durham University, 2006. http://etheses.dur.ac.uk/2436/.
Texte intégralRésumé :
This thesis investigates the structural properties of the AM2O7 family of materials, many of which show interesting thermal expansion properties and remarkably complex structures. It also develops Parametric Rietveld refinement, a method of extracting more information from multi-condition powder diffraction data. Chapter 1 reviews the relevant literature. Chapter 2 describes the equipment and analytic techniques used in the work. Chapter 3 describes Parametric Rietveld refinement, which aims to fit a single, evolving structural model to a series of diffraction data collected as a function of time, temperature, pressure or other external variable. This can lead to a number of benefits over conventional, sequential Rietveld refinement: it can increase the precision of refined parameters; allow physically realistic models to be applied during data analysis; and allow 'non-crystallographic’ quantities, such as temperature or rate constants, to be refined directly from diffraction data. Chapter 4 presents a full structure solution of ZrP(_2)O(_7) at room temperature from powder diffraction data. This involved developing a method for combining Rietveld refinement, restraints and simulated annealing. Despite 136 unique atoms and close-to metrically cubic symmetry, the true structure of this orthorhombic material can be refined to a high degree of precision. Chapter 5 is an investigation into the structures and thermal expansion of two AM(_2)O(_7) species, pseudo-cubic SnP(_2)O(_7) and GeP(_2)o(_7). A full structure solution of the room temperature phase of SnP(_2)O(_7) is presented. Two higher temperature phases of SnP(_2)O(_7) and the low temperature phase of GeP(_2)o(_7) are also analysed. Variable temperature data for both materials are presented. Chapter 6 describes the synthesis and characterisation via powder diffraction of solid-state solutions of the general formula Zr(_x)Sn(_1-x)P(_2)o(_7). The variation of properties across the series is investigated both at room temperature and upon heating.
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Mackney, Michael D. A. « Hull-superstructure interaction : generic models, preprocessors, numerical and experimental models, and parametric studies ». Thesis, University of Portsmouth, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333868.
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Falivene, Riccardo. « Revamping di un depuratore, studio dei parametri e verifica dei rendimenti ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Trouver le texte intégralRésumé :
L'elaborato parte dallo studio dell'evoluzione di un impianto di trattamento acque reflue industriali per poi passare all'analisi di una possibile integrazione mirata all'efficientamento del ciclo di depurazione. Viene, quindi, proposto un progetto di riutilizzo del refluo in uscita, attraverso l'impiego delle tecnologie di filtrazione a membrana, capace di alimentare alcuni sistemi generali di impianto. Il lavoro si conclude con un'analisi della fattibilità economica.
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Stepanova, K., et V. Stepanov. « About system-parametric formalization of economic and ecological processes ». Thesis, Sumy State University, 2014. http://essuir.sumdu.edu.ua/handle/123456789/36290.
Texte intégralRésumé :
One of the important problems of the present economic and environmental studies, in our opinion, is development of theoretical and methodological bases of analysis of complex economic and ecological interactions. At the same time the complexity of analysis of such processes is increasing: on the one hand, if it is necessary to take into account, at least indirectly, nonlinearity and other uncertainties; on the other hand, if it is necessary to provide a system-parametric description of the "image" of the object (process). These problems were highlighted in the papers, which addressed economic and environmental problems of the Black Sea and Azov basin and coastal regions.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/36290
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Chromý, Hynek. « Studie proveditelnosti malé vodní elektrárny ». Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226884.
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