Global ETD Search

931	Zdravotně technické a plynovodní instalace v průmyslové hale / Sanitation installation and gas installation in a factory unit Maslík, Michal January 2014 (has links) This thesis deals with health - technical and gas pipeline installations in the industrial hall. The building is situated in Frydek Mistek. The theoretical part compares the applicable technical rules for gas in Slovakia and the Czech Republic. The work also deals with the issue of determining the size of the reservoir water heater in several variants and compared to surveys by the use of hot water in similar objects. The design part is then developed addressing health - technical and gas pipeline installation for the specified object of the industrial hall.
932	Vývoj lineárního posuvu pro UHV STM/AFM / Development of a linear stage actuator for UHV STM/AFM Pavelec, Jiří January 2011 (has links) The aim of this diploma thesis is to develop a linear positioning stage for Ultra High Vacuum (UHV) environment. Simple prototypes of the linear positioning stage were designed and incorporated as part of a multiaxis sample manipulator for a UHV Scanning Tunneling Microscopy / Atomic Force Microscopy (STM/AFM). Different types of position encoders and linear guideways are discussed. Implementation of the homodyne interferometer as an optimization tool for a slip-stick based linear stage is described. Scalar diffraction theory is used to model the diffraction grating optical position encoder behavior.
933	Großflächige Abscheidung organischer Leuchtdioden und Nutzung optischer Verfahren zur in situ Prozesskontrolle Eritt, Michael 11 November 2010 (has links) In der vorliegenden Arbeit wird die großflächige Abscheidung von organischen Leuchtdioden (OLED) für Beleuchtungsanwendungen in einer neuartigen Beschichtungsanlage vorgestellt. Ausgehend von den speziellen Anforderungen an gleichförmige Schichtdickenverteilung und hohe Abscheideraten für die organischen Schichten, sind die Verfahren der thermischen Vakuumverdampfung (VTE) und der organischen Dampfphasenabscheidung (OVPD) auf Substraten der Größe 370 x 470 mm² unter Fertigungsbedingungen kombiniert. Die Quellensysteme der Anlage wurden hinsichtlich der Verteilung des Materialauftrages und der Oberflächenrauigkeit qualifiziert. Die Kontrolle der Schichteigenschaften ist bei der organischen Dampfphasenabscheidung durch Variation der Parameter Substrattemperatur und Abscheiderate in einem weiten Bereich möglich. Die in situ Kontrolle der Schichtdicke mittels spektroskopischer Reflektometrie wird vorgestellt. Ein Messsystem ist in die Beschichtungsanlage integriert und abgeschiedene Schichten charakterisiert worden. Die Arbeit zeigt, dass die genaue Bestimmung der Dicke einzelner Schichten oder ganzer Schichtstapel mit diesem Verfahren möglich ist und zur ex situ Ellipsometrie vergleichbare Ergebnisse liefert. Um robuste OLED-Bauelemente herzustellen, wird eine organische Kurzschlussunterdrückungsschicht eingeführt, die konform mittels der OVPD-Technologie abgeschieden wird. Die strombegrenzenden Eigenschaften dieser Schicht wirken Defektströmen innerhalb der OLED entgegen. Die reproduzierbare Herstellung von 100 x 100 mm² großen, weißes Licht emittierenden OLED-Modulen mit mittleren Leistungseffizienzen von über 13 lm/W zeigt das Potential dieser Technologie. / The thesis deals with the large area deposition of organic light-emitting diodes (OLED) for lighting applications with a novel deposition tool. The special needs of film thicknesses homogeneity and high deposition rates for organic layers request the combination of thermal vacuum deposition (VTE) and organic vapour phase deposition (OVPD) processes to fabricate OLEDs on 370 x 470 mm² substrates. The deposition sources are qualified regarding layer homogeneity and morphology of the deposition processes. The layer properties are controlled in a wide range by the variation of the organic vapour phase deposition parameters: substrate temperature and deposition rate. The in situ determination of the substrate thickness is shown by the application of spectroscopic reflectometry. The thesis demonstrates the thickness analysis of single and multi-layer stacks by reflectometry. The data fit well to ex situ ellipsometry. Robust OLED devices with an additional short-circuit protection layer deposited by OVPD technology are introduced. The current limiting properties of this layer reduce the leakage currents in the OLED device. The fabrication of 100 x 100 mm² white emitting OLED modules with power efficiencies about 13 lm/W shows the great potential of the manufacturing technology. info:eu-repo/classification/ddc/620 ddc:620
934	Entwicklung von HT-Lötsystemen für artfremde Werkstoffverbunde Blank, Robin 06 February 2020 (has links) In Gasturbinenbrennern kommen Nickelbasiswerkstoffe für thermisch hoch belastete Komponenten standardmäßig zum Einsatz. Die Bauteile liegen strömungstechnisch vor der stattfindenden Verbrennung, wodurch es zu einer stark einseitigen thermischen Belastung kommt. Ein wirtschaftlich effizienter Einsatz von Nickelbasiswerkstoffen kann daher in Kombination mit kostengünstigen warmfesten Stählen für die weniger stark thermisch belasteten Bauteilbereiche erreicht werden. Ziel der vorliegenden Arbeit ist die Prozessentwicklung zum Hochtemperaturlöten von im Brennerbau häufig verwendeten Nickelbasislegierungen und dem niedriglegierten warmfesten Stahl 16Mo3 (1.5415). Im Entwicklungsprozess wurden die Mikrostruktur der Verbunde charakterisiert, die Auswirkungen thermischer Ausdehnungsunterschiede evaluiert und die erreichbare Festigkeit erfasst. An einem Demonstrator wurden die Erkenntnisse im Rahmen der industriellen Fertigung getestet.:1 Einführung 1.1 Einleitung und Motivation 1.2 Stand von Wissenschaft und Technik 1.3 Schlussfolgerungen und Zielsetzung 2 Technologische Grundlagen 2.1 Der Hochtemperaturlötprozess 2.2 Thermische Ausdehnung 2.3 Diffusion 2.4 Metallurgische Prozesse 3 Experimentelle Durchführung 3.1 Grund- und Lotwerkstoffe 3.2 Lötprozesse und Probengeometrien 3.3 Mikrostrukturelle, thermische und mechanische Charakterisierung 4 Ergebnisse und Diskussion 4.1 Mikrostrukturcharakterisierung 4.1.1 Grundwerkstoffe 4.1.2 Lötsystem 16Mo3 – INCONEL 625 4.1.3 Lötsystem 16Mo3 – Nimonic 75 4.1.4 Lötsystem 16Mo3 – Hastelloy X 4.1.5 Lötsystem 16Mo3 – INCONEL 718 4.1.6 Normalisierungsgefüge von 16Mo3 4.1.7 Zusammenfassung der Mikrostrukturcharakterisierung 4.2 Thermische Ausdehnung 4.2.1 Maßänderung 4.2.2 Eigenspannungen 4.3 Mechanische Eigenschaften 4.3.1 Zugversuch 4.3.2 Zugscherversuch 4.3.3 Ermittlung der kritischen Überlapplänge 4.4 Demonstrator 5 Zusammenfassung und Ausblick / Nickel-base alloys for thermally high loaded components are widely used for gas turbine burner parts. By means of flow direction burner parts are located prior to the combustion. They are therefore one-sided thermally loaded. An economical efficient use of nickel based alloys can be achieved in combination with low alloyed steels for thermally less loaded components. The aim of this work is the development of brazing processes for GT-burner manufacturing related nickel based alloys and the low alloyed steel 16Mo3 (1.5415) using nickel based filler materials. The development includes a microstructural characterization of the brazed compounds, the evaluation of thermal expansion behavior and the maximum strength. A final test examines the feasibility by means of industrial manufacturing.:1 Einführung 1.1 Einleitung und Motivation 1.2 Stand von Wissenschaft und Technik 1.3 Schlussfolgerungen und Zielsetzung 2 Technologische Grundlagen 2.1 Der Hochtemperaturlötprozess 2.2 Thermische Ausdehnung 2.3 Diffusion 2.4 Metallurgische Prozesse 3 Experimentelle Durchführung 3.1 Grund- und Lotwerkstoffe 3.2 Lötprozesse und Probengeometrien 3.3 Mikrostrukturelle, thermische und mechanische Charakterisierung 4 Ergebnisse und Diskussion 4.1 Mikrostrukturcharakterisierung 4.1.1 Grundwerkstoffe 4.1.2 Lötsystem 16Mo3 – INCONEL 625 4.1.3 Lötsystem 16Mo3 – Nimonic 75 4.1.4 Lötsystem 16Mo3 – Hastelloy X 4.1.5 Lötsystem 16Mo3 – INCONEL 718 4.1.6 Normalisierungsgefüge von 16Mo3 4.1.7 Zusammenfassung der Mikrostrukturcharakterisierung 4.2 Thermische Ausdehnung 4.2.1 Maßänderung 4.2.2 Eigenspannungen 4.3 Mechanische Eigenschaften 4.3.1 Zugversuch 4.3.2 Zugscherversuch 4.3.3 Ermittlung der kritischen Überlapplänge 4.4 Demonstrator 5 Zusammenfassung und Ausblick info:eu-repo/classification/ddc/620 ddc:620
935	A Spectrum of Silence and the Single Storyteller: Stigma, Sex, and Mental Illness among the Latter-day Saints Crawford, Rebekah Perkins 01 October 2018 (has links) No description available. Communication Clergy Counseling Psychology Ethics Gender Studies Glbt Studies Health Mental Health Organization Theory Pastoral Counseling Psychotherapy Public Health Religion Religious Congregations Rhetoric Social Research Spirituality Womens Studies Mental health human sexuality religious leaders professional providers LDS Church brittle narrative narrative desert narrative vacuum spectrum of silence pornography LGBTQ identity sexual violence consent Christian communities
936	An Investigation of Material Properties and Tribological Performance of Magnetron Sputtered Thin Film Coatings Singh, Harpal January 2015 (has links) No description available. Engineering Aerospace Materials Mechanical Engineering Materials Science Experiments
937	3D SOFT MATERIAL PRINTER FOR IN-SPACE MANUFACTURING EXPERIMENT Albert john Patrick IV (15304819) 04 June 2024 (has links) <p> </p> <p>Additive manufacturing (or 3D printing) is one of the manufacturing processes which is currently being explored for its applicability under space boundary conditions, also known as in-space manufacturing. The space boundary conditions specifically affect material properties which in turn affect the printability of materials in space. Printing of soft materials in space is a novel application and the intent of this research was to print the softest of materials: edible materials, as a case study. 3D food printing is a novel food delivery method of using food products to either reproduce as a more aesthetically pleasing product or to print more nutrient-diverse foods. Launch of payload carrier and the boundary conditions of low Earth orbit including a vacuum environment, microgravity, temperature fluctuations, etc. These conditions make printing difficult, and my thesis is to overcome the boundary conditions (except microgravity) using a 3D soft material printer operating within a CubeSat. A CubeSat is a small satellite usually launched as an auxiliary payload used for basic Earth observation and radio communication. The printer must be able to survive launch and operation conditions, print within a simulated space environment, and adhere to the American Society for Testing and Materials (ASTM) specific definition of additive manufacturing. The 3D soft material printer was designed, fabricated, and tested using space and CubeSat boundary conditions for determining optimal design. Testing conditions including: (1) printing under Earth conditions showing it follows ASTM standards, (2) surviving NASA standards for vibration testing for microsatellites under launch conditions, (3) completing a print under a vacuum setting. The results of the testing would prove a small microsatellite could print in the vacuum of space and survive launch parameters. Further work would provide insight into the design of food printers being readily available in smaller sizes and its operability in microgravity condition. </p> Food chemistry and food sensory science Food technology Additive manufacturing Microtechnology Solid mechanics engineering 3 D Micro scale chocolate in-space manufacturing soft material 3D food printing Agriculture Manufacturing low earth orbit (LEO) vibration testing Vacuum testing technology CubeSats
938	Constructing and Commissioning HELIOS – A High Harmonic Generation Source for Pump-Probe Measurements with sub 50 fs Temporal Resolution : The Development of Experimental Equipment for Extreme Ultraviolet Spectroscopy Terschlüsen, Joachim A. January 2016 (has links) This thesis presents HELIOS, an in-house laboratory for time-resolved pump-probe spectroscopy with extreme-ultraviolet (XUV) probe radiation. A wide span of pump wavelengths can be generated using commercial laser equipment while XUV probe radiation is generated via a high harmonic generation process in a noble gas delivering probe photons with energies between 20 eV and 72 eV. The XUV beam path features a time-preserving monochromator and was constructed and built in-house. HELIOS features an overall time resolution of about 50 fs when using 800 nm pump and 41 eV probe photons. An energy resolution of 110 meV at 41 eV photon energy can be achieved. HELIOS features two beamlines. One µ-focus beamline with an XUV focal size of about 20 µm can be used with experiments that require such a small XUV focal size as well as with different end stations. The other beamline features a semi-permanently mounted end station for angle-resolved photoelectron spectroscopy under ultra-high vacuum conditions. Experiments demonstrating the usability of HELIOS and the two beamlines are presented. A pump-probe measurement on graphene demonstrates the capability of determining a large part of the k-space in only one measurement due to the use of an ARTOF angle-resolved time-of-flight electron spectrometer. A non-angle-resolved pump-probe measurement on the conducting polymer PCPDTBT demonstrates the high signal-to-noise ratio achievable at this beamline in non-angle-resolved photoelectron-spectroscopy pump-probe measurements. The usability of the µ-focus beamline is demonstrated with time-resolved measurements on magnetic samples employing an in-house-designed spectrometer. These experiments allow the retrieval of element-specific information on the magnetization within a sample employing the transversal magneto-optical Kerr effect (T-MOKE). Additionally, a Fourier transform spectrometer for the XUV is presented, the concept was tested at a synchrotron and it was used to determine the longitudinal coherence of the XUV radiation at HELIOS. Angle-resolved time-of-flight Angle resolved time of flight ARTOF ARPES tr-ARPES fs fs resolution Fourier transform spectrometer Fourier-transform spectrometer Fourier transform spectroscopy Fourier-transform spectroscopy FTS gas cell high harmonic generation laser liquid jet monochromator HELIOS HHG off-plane mount off plane mount OPA optical parametric amplifier PCPDTBT pulse shaping pump probe pump-probe measurements pump-probe measurements pump-probe spectroscopy pump-probe spectroscopy Rowland spectrometer time-of-flight spectrometer time of flight spectrometer TOF time-resolved spectroscopy time resolved spectroscopy time-resolved experiments time resolved experiments T-MOKE tr-PES PES photoelectron spectroscopy transverse magneto optical Kerr effect transverse magneto-optical Kerr effect ultrafast ultra-high vacuum ultra high vacuum UHV XUV VUV X-rays Permalloy magnetization dynamic
939	Kwantitatiewe beskrywende studie na die houding van verpleeglundiges teenoor terminasies van swangerskap binne king se sisteem teorie Truter, Anso 11 1900 (has links) The aim of this study was to describe the nurses‘ perception of termination of pregnancy and her perception of her conduct towards clients that request termination of pregnancy guided by Kings‘ Systems Approach and Goal Attainment Theory. A non-experimental quantitative descriptive correlational design was used. A non-probability purposive sampling method was used consisting of institutions in the Western Cape, available to participate in this study, which deliver termination of pregnancy services, gov ernment health care institutions (21) and Marie Stopes clinics (3). Non-probability convenience sampling was used consisting of registered nurses who are working in termination of pregnancy units in these facilities (N=82). Data were collected through the administration of a self-designed questionnaire. The main findings of the study indicate that respondents (personal system) appear to feel positive about the work they are doing. Formal improvement and development are however not utilised optimally. Regarding the interpersonal system, respondents also show a positive orientation to both the woman opting for termination of pregnancy and the foetus. The potential towards transaction and ultimately goal attainment reside within this system. The respondents are also positive about legislation, employers and policies (social system) relating to termination of pregnancy. This orientation creates a milieu that is conducive to transactions, interactions and goal attainment.The main recommendation is that three systems as proposed by King be continuously integrated within the termination of pregnancy setup through, amongst other measures: values clarification, management support, in service education, the inclusion of termination of pregnancy in undergraduate programmes, focus groups and the like. / Die doel van hierdie studie was om die verpleegkundige se persepsie van terminasie van swangerskap en haar persepsie van haar houding en gedrag teenoor kliёnte wat terminasie van swangerskap versoek, aan die hand van King se Sisteembenadering en Doelwitbereikingsteorie te ondersoek en te beskryf. `n Nie-eksperimentele kwantitatiewe beskrywende korrelasie navorsingsontwerp was gebruik. `n Nie-waarskynlike doelbewuste-steekproefneming van die staatsgesondheidsorg-instansies wat terminasie van swangerskapdienste aanbied, is geneem en wat beskikbaar vir hierdie studie was (21) asook die Marie Stopesdienste (3), in die Wes-Kaap. `n Nie-waarskynlike gerieflikheidsteekproefneming is van verpleegkundiges geneem wat swangerskappe in hierdie afdelings termineer of moet termineer (N=82). Data is met behulp van `n selfontwerpte vraelys ingesamel. Die hoofbevindings van die studie dui daarop dat respondente (persoonlike sisteem) positief voel oor hul werk. Formele ontwikkelingshulpbronne word egter nie optimaal deur die sisteem benut nie. Wat die interpersoonlike sisteem betref, toon respondente ook ‗n positiewe oriëntasie tot beide die vrou wat terminasie van swangerskap aanvra en die fetus. Die potensiaal tot transaksie-sluiting en uiteindelike doelwitbereiking is binne hierdie sisteem geleë. Die respondente is ook positief oor wetgewing en die werkgewer en beleid (sosiale siteem) ten opsigte van terminasie van swangerskap. Hierdie oriëntering laat ‗n milieu wat bevorderlik is vir transaksie-sluiting, interaksie en doelwitbereiking. Die hoofaanbeveling is dat voortdurend gepoog moet word na die integrasie van King se drie sisteme binne die terminasie van swangerskapafdelings deur onder meer: waarde-uitklaringswerkswinkels, ondersteuning van bestuur, indiensopleiding, die insluiting van terminasie van swangerskap in voorgraadse kurrikula, fokusgroepe en so meer. / Health Studies / D. Litt. et Phil. (Gesondheidstudies) Berading Geloof Houding Indiensopleiding Interpersoonlike sisteem Kliënt Manuele vakuum aspirasie-tegniek Ontladingsessies Persepsie Persoonlike sisteem Pro-keuse Pro-lewe Rol Sosiale sisteem Stres Terminasie van swangerskap Verpleegkundige Verpleging\versorging Waarde-uitklaring Attitude Client Counselling Debriefing sessions In service training Interpersonal system Manual vacuum aspiration (MVA) Nursing\caring Perception Personal system Pro-choice Pro-life Registered nurse Religion Role Social system Stress Termination of pregnancy Trainig Values clarification 362.19888 Abortion -- Moral and ethical aspects Abortion -- Religious aspects Nursing ethics Nurses -- Attitudes Nurse and patient Nursing -- Psychological aspects
940	Advanced materials for plasma facing components in fusion devices Thomas, Gareth James January 2009 (has links) This thesis describes the design, manufacture and characterisation of thick vacuum plasma sprayed tungsten (W) coatings on steel substrates. Fusion is a potentially clean, sustainable, energy source in which nuclear energy is generated via the release of internal energy from nuclei. In order to fuse nuclei the Coulomb barrier must be breached - requiring extreme temperatures or pressures – akin to creating a ‘star in a box’. Tungsten is a promising candidate material for future fusion reactors due to a high sputtering threshold and melting temperature. However, the large coefficient of thermal expansion mismatch with reactor structural steels such as the low activation steel Eurofer’97 is a major manufacturing and in-service problem. A vacuum plasma spraying approach for the manufacture of tungsten and tungsten/steel graded coatings has been developed successfully. The use of graded coatings and highly textured 3D interface surfi-sculpt substrates has been investigated to allow the deposition of thick plasma sprayed tungsten coatings on steel substrates. Finite element models have been developed to understand the residual stresses that develop in W/steel systems and made use of experimental measurements of coating thermal history during manufacture and elastic moduli measured by nano-indentation. For both the graded and surfi-sculpt coating, the models have been used to understand the mechanism of residual stress redistribution and relief in comparison with simple W on steel coatings, particularly by consideration of stored strain energy. In the case of surfi-sculpt W coatings, the patterned substrate gave rise to regular stress concentrating features, and allowed 2mm thick W coatings to be produced reproducibly without delamination. Preliminary through thickness residual stress measurements were compared to model predictions and provided tentative evidence of significant W coating stress relief by regulated coating segmentation. 621.48

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