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Dissertations / Theses on the topic 'Low pressure gas carburizing'

Author: Grafiati

Published: 8 June 2024

Last updated: 31 July 2025

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1

Matamoros, Marin Fatima. "Modélisation et optimisation des fours de cémentation gazeuse basse pression." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0288.

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Ce travail de thèse s'intéresse au développement d'une méthodologie d'optimisation des fours de cémentation gazeuse basse pression. L'objectif est de déterminer les conditions opératoires optimales qui permettent aux opérateurs exposés aux sous-produits toxiques générés (les hydrocarbures aromatiques polycycliques (HAP) et les suies en l'occurrence) de travailler dans des conditions plus sûres. Un modèle phénoménologique du procédé basé sur les équations du bilan de matière et des équations issues d'un mécanisme cinétique détaillé de pyrolyse d'acétylène en phase gazeuse, est d'abord développé

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2

Wang, Danqi. "LOW-TEMPERATURE GAS-PHASE CARBURIZING AND NITRIDING OF 17-7 PH STAINLESS STEEL." Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1386165240.

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3

Weatherup, Clifford Robert. "New low pressure gas switches." Thesis, University of St Andrews, 1991. http://hdl.handle.net/10023/14040.

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This thesis describes an investigation the aim of which was the development of low pressure gas switches with the advantages of zero standby power consumption and instant readiness. Hydrogen thyratrons use a hollow anode to give the switch a convenient reverse conduction capability. The hollow anode structure has been shown to pass a 4 kA pulse current at 500 Hz for 10<sup>10 </sup>shots. The use of the hollow anode structure as a cold cathode for a low pressure switch is proposed and triggering of the structure by ions is demonstrated. Under conditions of low gas pressure and high discharge v

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4

Андріїшин, Mихайло Петрович, Костянтин Іванович Капітанчук, Назар Михайлович Андріїшин, Kostiantyn Kapitanchuk, and Константин Иванович Капитанчук. "Natural gas turbine flow meters calibrations in low gas flow pressure situations." Thesis, Національний авіаційний університет, 2018. http://er.nau.edu.ua/handle/NAU/39801.

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In the article criteria of possible turbine flow meters calibrations with natural gas, parameters fluctuations are determined Article presents experimentation results of natural gas parameters influence on processes that occur in turbine flow meters. In the article criteria of possible turbine flow meters calibrations with natural gas, parameters fluctuations are determined. It is known that metrological parameters of the turbine flow meter in operating systems will deter from certificated values. With pressure, temperature or other fluctuations of a flow physical parameters the flow meter's r

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5

Yang, Suidong. "Diagnostics and modelling of an inductively coupled RF low-pressure low-temperature plasma." Thesis, n.p, 1998. http://oro.open.ac.uk/19841/.

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6

Parkinson, J. S. "Control system design for low pressure gas distribution networks." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378367.

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7

Ingram, S. G. "Investigations of low pressure RF discharges in argon." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.480534.

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8

Schirlin, Julien T. "Targeting low vapour pressure compounds in gas-phase electron diffraction." Thesis, University of Edinburgh, 2004. http://hdl.handle.net/1842/11377.

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Gas-phase electron diffraction (GED) has remained the most valuable technique for the collection of structural information in the gas phase, for the last 70 years. Unfortunately, this structural technique had reached a limiting factor: the volatility of chemicals. Therefore this work aims to provide new ways to overcome both the kinetic and thermodynamic aspects of this problem by the adoption of a new nozzle design and by the use of a reservoir. The new nozzle extends the capabilities of gas electron diffraction to compounds with lower vapour pressures or with vaporisation rates not adequate

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9

Craig, G. "Thomson scattering measurements in low pressure inert and molecular gas plasmas." Thesis, Queen's University Belfast, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403450.

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10

Moss, Graham James. "A time-dependent collisional-radiative model of low pressure gas discharges." Thesis, University of Sheffield, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269399.

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11

Justo, Hernandez Ruiz. "Low differential pressure and multiphase flow measurements by means of differential pressure devices." Diss., Texas A&M University, 2004. http://hdl.handle.net/1969.1/1077.

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The response of slotted plate, Venturi meter and standard orifice to the presence of two phase, three phase and low differential flows was investigated. Two mixtures (air-water and air-oil) were used in the two-phase analysis while a mixture of air, water and oil was employed in the three-phase case. Due to the high gas void fraction (α>0.9), the mixture was considered wet gas. A slotted plate was utilized in the low differential pressure analysis and the discharge coefficient behavior was analyzed. Assuming homogeneous flow, an equation with two unknowns was obtained for the multi-phase flow

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12

Malmberg, Andreas. "The influence of carbonitriding on hardness, retained austenite and residual stress in 52100 steel." Thesis, KTH, Materialvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173804.

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High rolling contact fatigue parts are vital for the long service life of fuel pumps. Cummins Fuel Systems are currently using an M2 tool steel for one of the most important roller bearing application in their pumps, namely the cam follower. The future design of the cam follower is a pin-less tappet roller. The wear and fatigue properties of the roller is vital to ensure reliability of the fuel system. M2 tool steel is an expensive material and becomes even more so if diamond like coating (DLC) is needed to decrease the friction coefficients. To cut costs of the fuel pump it might be possible

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13

Jayasuriya, Jeevan. "Experimental Investigations of High Pressure Catalytic Combustion for Gas Turbine Applications." Doctoral thesis, KTH, Kraft- och värmeteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-134445.

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This work is devoted to generate knowledge and high quality experimental data of catalytic combustion at operational gas turbine conditions. The initial task of the thesis work was to design and construct a high pressure combustion test facility, where the catalytic combustion experiments can be performed at real gas turbine conditions. With this in mind, a highly advanced combustion test facility has been designed, constructed and tested. This test facility is capable of simulating combustion conditions relevant to a wide range of operating gas turbine conditions and different kinds of fuel g

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14

O'Connor, Gavin Thomas. "Development of a low pressure-inductively coupled plasma-ion source for mass spectrometry." Thesis, University of Plymouth, 1998. http://hdl.handle.net/10026.1/1764.

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A low pressure-inductively coupled plasma (LP-ICP) ion source has been investigated for the production of atomic and molecular ions for mass spectrometry (MS). A dedicated LPICP- MS was constructed, by modifying a Hewlett Packard mass selective detector, to detect ions from the LP-ICP. The ion sampling interface and ion optics were designed using established theory and the use of a computer simulation program. Perfluorotributylamine was continuously introduced into the LP-ICP, via a molecular leak, and the ion sampling interface, plasma forward power, and plasma gas flow rates, were optimised.

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15

Kalitan, Danielle Marie. "A Study of Syngas Oxidation at High Pressures and Low Temperatures." Doctoral diss., University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2422.

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Ignition and oxidation characteristics of CO/H2, H2/O2 and CO/H2/CH4/CO2/Ar fuel blends in air were studied using both experimental and computer simulation methods. Shock-tube experiments were conducted behind reflected shock waves at intermediate temperatures (825 < T < 1400 K) for a wide range of pressures (1 < P < 45 atm). Results of this study provide the first undiluted fuel-air ignition delay time experiments to cover such a wide range of syngas mixture compositions over the stated temperature range. Emission in the form of chemiluminescence from the hydroxyl radical (OH*) transition nea

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16

McCluney, Peter. "Development of a small natural gas fuelled two stroke cycle engine using low pressure injection." Thesis, Queen's University Belfast, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241433.

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17

Leimkuehler, Thomas O. "Investigation of low-pressure laser induced fluorescence for measuring temperature profiles in a rarefied gas /." free to MU campus, to others for purchase, 2000. http://wwwlib.umi.com/cr/mo/fullcit?p9999301.

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18

Heath, Melissa. "Heat Transfer Regimes during Charging of Pressure Vessels with Compressed Gas at Low Reynolds Numbers." Thesis, Griffith University, 2018. http://hdl.handle.net/10072/378153.

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Over the past decade signi cant interest in heat transfer during lling of pressure vessels has arisen due to overheating and under- lling when utilizing compressed hydrogen gas as a practical storage solution for clean energy sources. The problem is most clearly evident when hydrogen is stored as compressed gas for use in the automotive industry since carbon bre reinforced plastic (CFRP) vessels are used for their low weight. The low thermal conductivity of the plastic component of the vessel wall has an insulating e ect on the stored gas. During lling, the gas undergoes heating due to comp

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19

Vancko, Jr Robert M. "Effect of a drag reducing agent on pressure drop and flow regime transitions in multiphase horizontal low pressure pipelines." Ohio University / OhioLINK, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1184354301.

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20

Mrosek, Matthias. "Model-based control of a turbocharged diesel engine with high- and low-pressure exhaust gas recirculation." Phd thesis, VDI Verlag, 2017. https://tuprints.ulb.tu-darmstadt.de/6960/1/Dissertation_Mrosek_TUprints.pdf.

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Modern Diesel engines fulfil challenging requirements for emission limits, fuel consumption and ride comfort by numerous modular combinable components and mechatronical actuators. These components are utilised for precondition and aftertreatment of air, fuel and exhaust gas, which is involved in the combustion process. In this dissertation a methodology for a model-based function development with semi-physical engine models for control of air path quantities of an exemplary Diesel engine with high-pressure (HP-EGR) and low-pressure exhaust gas recirculation (LP-EGR) is developed. In this frame

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21

Le, Thi Kim Cuong. "Raman spectroscopy of soot produced in low pressure flames : ex situ Analyses and Online Gas Phase Studies." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS068/document.

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Chaque année, une quantité de 107tonnes de suie est produite à l'échelle mondiale. Le carbone-suie dans l'atmosphère a des effets graves sur le changement climatique et la santé humaine. Les impacts dépendent de nombreux facteurs comme les composés organiques adsorbés, le vieillissement et les processus de mélange. Par conséquent, afin de réduire la quantité de suie émise, outre l'examen des facteurs mentionnés, les études de la cinétique de formation, de la structure et des propriétés optiques des suies sont également essentielles. Il existe plusieurs méthodes optiques dans les études sur la

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22

Zhang, Kaiyi. "CO2 Minimum Miscibility Pressure and Recovery Mechanisms in Heterogeneous Low Permeability Reservoirs." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/93728.

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Benefited from the efficiency of hydraulic fracturing and horizon drilling, the production of unconventional oil and gas resources, such as shale gas and tight oil, has grown quickly in 21th century and contributed to the North America oil and gas production. Although the new enhancing oil recover (EOR) technologies and strong demand spike the production of unconventional resources, there are still unknowns in recovery mechanisms and phase behavior in tight rock reservoirs. In such environment, the phase behavior is altered by high capillary pressure owing to the nanoscale pore throats of shal

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23

Cheng, An-jen Tzeng Y. "Cold cathodes for application in poor vacuum and low pressure gas environments carbon nanotubes versus zinc oxide nanoneedles /." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Spring/master's/CHENG_AN-JEN_7.pdf.

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24

Bolduc, Mathieu. "Deposition of Commercially Pure Titanium Powder Using Low Pressure Cold Spray and Pulsed Gas Dynamic Spray for Aerospace Repairs." Thesis, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24249.

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The objective of this study is to investigate the feasibility of depositing 1.5 mm thick titanium coatings, as a repair method for aerospace Ti-6Al-4V substrates, using two new commercially available processes: Low Pressure Cold Spray (LPCS) and Pulsed Gas Dynamic Spray (PGDS). The coatings produced were examined and characterized by their porosity level, microhardness, adhesion strength, particle flattening ratio, wipe tests, fracture surface type and wear tests. Phases and chemical composition were determined using X-Ray diffraction analysis and energy dispersive spectroscopy, respectively.

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25

Moore, Myles Thomas. "An Integrative Geochemical Technique to Determine the Source and Timing of Natural Gas Formation in Gas Hydrates." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1577959057433697.

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26

Lui, Samson Sze-Sang. "A Data Acquisition System Experiment for Gas Temperature and Pressure Measurements on a Liquid-Nitrogen-Powered Vehicle." Thesis, University of North Texas, 1998. https://digital.library.unt.edu/ark:/67531/metadc278790/.

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A data acquisition system was set up to measure gas temperatures and pressures at various points on a liquid-nitrogen-powered vehicle. The experiment was attempted to develop a data acquisition method for applications on engines that use liquid air as the fuel. Two thermocouples and a pressure transducer were connected using data acquisition instruments interfaced to a laptop computer to acquire data.

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27

Pelletier, Jean-Louis. "Development of Ti-6Al-4V Coating onto Ti-6Al-4V Substrate Using Low Pressure Cold Spray and Pulse Gas Dynamic Spray." Thesis, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24239.

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The objective of this study is to successfully deposit Titanium Ti-6Al-4V layers onto Ti-6Al-4V substrate using two new commercially available Cold Spray processes such as Low Pressure Cold Spray (LPCS) and Pulsed Gas Dynamic Spray (PGDS). The second objective of this work is to develop a technique to repair Titanium parts since there is currently no repair technique commercially available. It is envisioned that commercial cold spray systems could be used to repair gashes on Titanium components. The examination of both feedstock powders and coatings were performed by different techniques such

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28

Cotton, Dominique. "Etude de formation d'hémicarbure de tantale (Ta2C) par l'intermédiaire d'un procédé de cémentation sous pression réduite." Thesis, Dijon, 2015. http://www.theses.fr/2015DIJOS010/document.

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Le tantale est un métal très dense (d = 16,6) et fond à très haute température (2996°C), ce qui en fait un matériau potentiellement utilisable pour des creusets utilisés en pyrochimie. La littérature montre qu'il est possible de renforcer encore ces propriétés anti-corrosion par un traitement de cémentation. En effet, la corrosion intergranulaire du tantale est stoppée par la présence de précipités de Ta2C aux joints de grains. L'obtention du Ta saturé carbone avec Ta2C aux joints de grains en surface (Ta(C) + Ta2C), très pauvre en carbone, demande une bonne compréhension et une maitrise de la

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29

Beule, Caroline de [Verfasser], and Gerhard [Akademischer Betreuer] Wurm. "Lifting grains from a dust bed by interaction with optical radiation and gas at low ambient pressure / Caroline de Beule. Betreuer: Gerhard Wurm." Duisburg, 2016. http://d-nb.info/1090785550/34.

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30

Robin, Frisk. "Distortion Analysis of Low Pressure Carburized Components : A heat treatment distortion comparison of transmission gear components for truck and automobile." Thesis, KTH, Materialvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-193539.

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During the last 10 years, low pressure carburizing and high pressure gas quenching has become more popular since it is a “new” process and researchers reports that the distortion characteristics gained from these processes is improved in relation to conventional processes. The aim of this work was to investigate the distortions gained from three different heat treatment processes on main shaft gears and crown wheels. Experiments with atmospheric carburization with oil quenching and low pressure carburization with nitrogen gas quenching or oil quenching were made and distortion characteristics

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31

Mrosek, Matthias Patrick Alexander [Verfasser], Rolf [Akademischer Betreuer] Isermann, and Ulrich [Akademischer Betreuer] Konigorski. "Model-based control of a turbocharged diesel engine with high- and low-pressure exhaust gas recirculation / Matthias Patrick Alexander Mrosek ; Rolf Isermann, Ulrich Konigorski." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2017. http://d-nb.info/1145141935/34.

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32

Simiema, de Freitas Barbosa Gustavo [Verfasser], Bernd [Akademischer Betreuer] Mayer, Bernd [Gutachter] Mayer, and Jürgen [Gutachter] Meichsner. "Construction and Evaluation of Gas Feed-in System, Electrodes and Gas Exhaustion System applied to Low Pressure Plasma Coating Processes / Gustavo Simiema de Freitas Barbosa ; Gutachter: Bernd Mayer, Jürgen Meichsner ; Betreuer: Bernd Mayer." Bremen : Staats- und Universitätsbibliothek Bremen, 2018. http://d-nb.info/1165772302/34.

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33

Loukota, Martin. "Návrh dvoutlakého vertikálního kotle na odpadní teplo za plynovou turbínou na zemní plyn." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-319280.

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This master‘s thesis deals with design of vertical heat recovery steam generators (HRSG). In the introduction part is performed description and distribution HRSG, thermal calculation, proposal of a heat transfer surfaces and choice of materials. Finally is executed aerodynamic calculation, hydraulic calculation and then are suggested dimensions of the drums. Thesis also includes technical documentation of the boiler.

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34

Bongers, Marian David Verfasser], Astrid [Akademischer Betreuer] Pundt, Astrid [Gutachter] Pundt, et al. "In situ studies on palladium/rutile titanium dioxide exposed to low pressure hydrogen gas environments / Marian David Bongers ; Gutachter: Astrid Pundt, Michael Seibt, Hans Christian Hofsäss, Reiner Kirchheim, Vasily Moshnyaga, Martin Wenderoth ; Betreuer: Astrid Pundt." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2018. http://d-nb.info/1171521464/34.

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35

Ngeleka, Tholakele Prisca. "Sulphur dioxide capture under fluidized bed combustion conditions / Tholakele Prisca Ngeleka." Thesis, North-West University, 2005. http://hdl.handle.net/10394/1416.

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An investigation was undertaken to determine the feasibility of increasing the hydrogen production rate by coupling the water gas shift (WGS) process to the hybrid sulphur process (HyS). This investigation also involved the technical and economical analysis of the water gas shift and the H2 separation by means of Pressure swing adsorption (PSA) process. A technical analysis of the water gas shift reaction was determined under the operating conditions selected on the basis of some information available in the literature. The high temperature system (HTS) and low temperature system (LTS) reactor

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Ngeleka, Tholakele Prisca. "An investigation into the feasibility of applying the watergas shift process to increase hydrogen production rate of the hybrid sulphur process / T.P. Ngeleka." Thesis, North-West University, 2008. http://hdl.handle.net/10394/4108.

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An investigation was undertaken to determine the feasibility of increasing the hydrogen production rate by coupling the water gas shift (WGS) process to the hybrid sulphur process (HyS). This investigation also involved the technical and economical analysis of the water gas shift and the H2 separation by means of Pressure swing adsorption (PSA) process. A technical analysis of the water gas shift reaction was determined under the operating conditions selected on the basis of some information available in the literature. The high temperature system (HTS) and low temperature system (LTS) reactor

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37

Malbois, Pierre. "Analyse expérimentale par diagnostics lasers du mélange kérosène/air et de la combustion swirlée pauvre prémélangée, haute-pression issue d’un injecteur Low-NOx." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMIR25/document.

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Les motoristes aéronautiques misent sur le développement de systèmes d’injection de carburant innovants pour réduire la consommation de carburant et les émissions de polluants. L’objectif de la thèse est de contribuer à l’étude expérimentale d’un injecteur « Lean Premixed » par le développement de diagnostics lasers couplant des approches basées sur la diffusion de Mie et l’émission fluorescente de traceurs. Les mesures ont été réalisées sur le banc de combustion haute pression HERON. Une approche novatrice avec l’imagerie de fluorescence du kérosène a permis d’obtenir une quantification du mé

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38

Filoušová, Natálie. "Parní turbína v paroplynovém cyklu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318750.

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Diploma thesis named Steam turbine in the combi cycle deals with design of low pressure part of three-body turbine and it’s lateral outlet throat to the air condenser. Before the design itself, the thermal schema of entire turbine is calculated. Than follows the detail draft, the strength calculations are included as well. Turbine has any technological consumption of steam or any regenerativ consumption. Turbine will be suplly to Panama. The thesis includes following drawings: cut of flowing part, design of outlet throat and fixing of inner body in outer body of low pressure part. The diploma

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Biggs, Timothy James. "Studies of crystalline organic molecular materials under extreme conditions." Thesis, University of Oxford, 2006. http://ora.ox.ac.uk/objects/uuid:51dae806-2954-4ea7-a3cb-1980ecb53e98.

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This thesis describes investigations into the properties of -phase BEDT-TTF charge transfer salts. Charge transfer salts are mainly studied as they are very useful test beds for fundamental physics due to the tuneability of their proper- ties and ground states. The effects of temperature and pressure on such systems have been studied, as these allow access to a wide range of different states and properties. Transport properties of these systems have been studied to obtain information about the Fermi surface and effective mass, and the effect of deuter- ation and also change of pressure media w

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Fletcher, Nathan James. "Design and Implementation of Periodic Unsteadiness Generator for Turbine Secondary Flow Studies." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1560810428267352.

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Fernandes, Hipolito Ana Isabel. "Étude des phénomènes de transport dans un réacteur catalytique pilote de type filaire." Thesis, Lyon 1, 2010. http://www.theses.fr/2010LYO10285/document.

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L’extrapolation des réacteurs catalytiques nécessite l’acquisition des données cinétiques sur des réacteurs à petite échelle dans les conditions opératoires industrielles. Le critère de dimensionnement utilisé lors de la réduction d’échelle est la conservation de la vitesse volumique horaire, ce qui conduit à des vitesses de circulation très faibles dans les réacteurs pilotes à lit-fixe. A ces vitesses, les flux de transfert de matière externes peuvent devenir limitant par rapport au flux de réaction. Dans ce contexte, une nouvelle géométrie de réacteur a été imaginée pour intensifier les tran

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TERNER, MATHIEU. "Innovative materials for high temperature structural applications: 3rd Generation γ-TiAl fabricated by Electron Beam Melting". Doctoral thesis, Politecnico di Torino, 2014. http://hdl.handle.net/11583/2527509.

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In the aeronautics industry, the propulsion systems stand among the most advanced and critical components. Over the last 50 years, gas turbine aeroengines were subjected to intensive research to increase efficiency and reduce weight, noise and harmful emissions. Together with design optimization, breakthrough in materials science for structural applications triggered the development of the most advanced gas turbine engines. For low temperatures, basically ahead of the combustion section, lightweight Ti alloys are preferred for their good mechanical properties. For high temperatures instead, Ni

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Gicquel, Alix. "Etude des processus catalytiques heterogenes dans les milieux plasmas basse pression hors-equilibre." Paris 6, 1987. http://www.theses.fr/1987PA066396.

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Etude des reacteurs tubulaires a plasma basse pression dans le cas de reactions consecutives cinetiquement controlees par une etape endothermique. Le role catalytique d'une feuille de tungstene se traduit par une augmentation de l'excitation vibrationnelle des molecules dans la couche limite; a contrario, le transfert d'energie vers le solide est d'autant moins important que le solide est meilleur catalyseur. L'excitation vibrationnelle se communique aux molecules reactives au cours de transfert vibration-vibration. Les especes reactives sont alors susceptibles de franchir les verrous reaction

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Tobek, Miroslav. "Řešení dopravy v centru Havlíčkova Brodu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-225922.

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The aim of this diploma thesis is the solution of the traffic situation in the city center of Havlíčkův Brod. Mainly the ground road number II/150 adjustment, which consist in the modification of the two-way traffic to one-way traffic organization in the streets Dolní, Žižkova and Na Ostrově by using the analogy of a roundabout layout, is solved within this thesis. All mentioned modifications simplify the traffic situation, improve the orientation and increase the security and the traffic flow mainly in relation to pedestrians and cyclists. Another part of this thesis is focused on revitalizat

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Mallardeau, Catherine. "L'hydrogène atomique polarisé : interaction avec les films d'Helium : expérience de compression." Paris 6, 1986. http://www.theses.fr/1986PA066186.

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Etude expérimentale de certains mécanismes de recombinaison de H| afin de comprendre les limites à l'obtention de la condensation de Bose Einstein. Mesure de l'énergie d'adsorption de H sur une couche mince 4He en fonction de l'épaisseur de la couche, paramètre qui donne les limites de stabilisation de H à basse température; obtention de la stabilisation sur des couches biomoléculaires. Construction d'un dispositif expérimental pour comprimer le gaz H| en champ magnétique de 20t, pour étudier le taux de recombinaison à 3 corps de H à haute densité et en champ magnétique intense.

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Quichaud, Viviane. "Etude des processus elementaires : de synthese de la molecule no, en post-decharge en ecoulement, de collisions titane-gaz rares, titane-molecules, par perturbation laser resolue en temps." Paris 6, 1987. http://www.theses.fr/1987PA066135.

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I. Etude de la preparation des etats excites de no dans un dispositif de post-decharge en ecoulement a partir de n::(2) excite (prepare par transfert d'excitation a partir d'atomes ar metastables dans une decharge basse pression) et de o (obtenu par dissociation de o::(2) dans une decharge de he). Observation d'une emission intense des bandes gamma de no, qui implique un etat a courte duree de vie (b) de n::(2) et le premier etat metastable de o. Ii. Analyse des processus d'extinction et de transfert d'excitation a partir d'etats a courte duree de vie de ti (crees dans un dispositif a cathode

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Hsu, Shuo-Han, and 徐碩韓. "Study on Low-temperature Carburizing of Austenitic Stainless Steel by the Gas Carburizing Method." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/11375772547653487334.

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碩士<br>國立臺灣大學<br>機械工程學研究所<br>100<br>Austenitic stainless steel is an alloy steel containing large amounts of nickel, chromium and other alloying elements. The surface will form a thin layer of Cr2O3 passive film, which is resistant to corrosion, so that this type of stainless steel can be applied in petroleum engineering, chemical engineering, medical equipment, and the food industry etc. However, this stainless steel will easily be scratched due to its low hardness; therefore in the application of mechanical parts, its wear resistance often fails to meet the requirements of the users. Carburiz

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Tinashe, Sanyangare Edwin. "Conceptual design of a low pressure cold gas dynamic spray (LPCGDS) system." Thesis, 2010. http://hdl.handle.net/10539/8398.

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Low Pressure Cold Gas Dynamic Spray (LPCGDS) is a coating process that utilises kinetic energy instead of thermal energy to deposit powder particles (1-50 μm) to substrates at low temperatures (<400 oC) without going through melting. The deposited coatings provide improved wear and corrosion protection to underlying surfaces while maintaining the original phase structure of the particles and minimising oxide formation and residual stresses associated with conventional thermal spray processes such as flame, arc and plasma spraying. Bonding occurs when particles impact velocities on the su

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(7038164), Gayathri Shivkumar. "Coupled plasma, fluid and thermal modeling of low-pressure and microscale gas discharges." Thesis, 2019.

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<p>Large scale and cost-efficient synthesis of carbon nanostructured materials has garnered tremendous interest over the last decade owing to their plethora of engineering and bio-science applications. One promising method is roll-to-roll radio frequency chemical vapor deposition and this work presents a computational investigation of the capacitively coupled radio frequency plasma in such a system. The system operates at moderate pressures (less than 30 mbar) with an 80 kHz square wave voltage input. The computational model aids the understanding of plasma properties and α-γ transition parame

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Amato, Giorgio. "Design Solutions for Reducing Losses in Aeronautical Low-Pressure Turbines." Doctoral thesis, 2021. http://hdl.handle.net/2158/1235154.

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The present thesis deals with the generation of innovative design solutions for reducing aerodynamic losses in Low-Pressure Turbines through the combined use of Artificial Neural Networks and CFD (Computational Fluid Dynamics). In particular, a lean model for optimizing blade airfoils in a multi-row environment and the development of a passive control device for reducing secondary losses are presented. The first procedure allows building a 1.5 stage by starting from a single blade profile, which is one of the main focuses of low TRL (Technology Readiness Level) design activities. In the obtai

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