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Dissertations / Theses on the topic 'Metallic channel'

Author: Grafiati

Published: 6 September 2023

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1

Görtan, Mehmet Okan [Verfasser], Peter [Akademischer Betreuer] Groche, and Clemens [Akademischer Betreuer] Müller. "Severe plastic deformation of metallic materials by equal channel angular swaging: Theory, experiment and numerical simulation / Mehmet Okan Görtan. Betreuer: Peter Groche ; Clemens Müller." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2014. http://d-nb.info/1110902077/34.

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2

Turan, Cabir. "Investigations on the Effect of Manufacturing on the Contact Resistance Behavior of Metallic Bipolar Plates for Polymer Electrolyte Membrane Fuel Cells." VCU Scholars Compass, 2011. http://scholarscompass.vcu.edu/etd/2629.

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Polymer electrolyte membrane fuel cells (PEMFCs) have emerged as a strong and promising candidate to replace internal combustion engines (ICE) due their high efficiency, high power density and near-zero hazardous emissions. However, their commercialization waits for solutions to bring about significant cost-reductions and significant durability for given power densities. Bipolar plate (BPP) with its multi-faceted functions is one of the essential components of the PEMFC stacks. Stainless steel alloys are considered promising materials of choice for bipolar plate (BPP) applications in polymer e

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3

Steenberge, Nele van. "Study of structural changes in Zr-based bulk metallic glasses upon annealing and deformation treatments." Doctoral thesis, Universitat Autònoma de Barcelona, 2008. http://hdl.handle.net/10803/3420.

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Los materiales conocidos como vidrios metálicos han sido sujeto de estudio e todo el mundo desde los años 50, por el cual se ha conseguido un progreso importante en el entendimiento del comportamiento de estos materiales. Como el nombre sugiere, son aleaciones metálicas amorfas en las que no existe el orden a largo alcance. La ausencia de este tipo de orden les dota de propiedades físicas, químicas y mecánicas que son únicas comparadas con las de otros materiales metálicos convencionales.<br/>Sin embargo, los primeros sistemas amorfos fueron obtenidos por técnicas de solidificación rápida,

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4

Rossi, Paul J. [Verfasser], and Eric Jan [Akademischer Betreuer] Mittemeijer. "Microstructural changes and intermetallic compound formation in metallic bilayers / Paul J. Rossi ; Betreuer: Eric Jan Mittemeijer." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2016. http://d-nb.info/1124841342/34.

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5

Kotze, Johannes Paulus. "Thermal energy storage in metallic phase change materials." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/96049.

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Thesis (PhD) -- Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Currently the reduction of the levelised cost of electricity (LCOE) is the main goal of concentrating solar power (CSP) research. Central to a cost reduction strategy proposed by the American Department of Energy is the use of advanced power cycles like supercritical steam Rankine cycles to increase the efficiency of the CSP plant. A supercritical steam cycle requires source temperatures in excess of 620°C, which is above the maximum storage temperature of the current two-tank molten nitrate salt storage, which stores thermal

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6

Bhardwaj, Abhinav. "Metallic Encapsulation for High Temperature (>500 °C) Thermal Energy Storage Applications." Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5843.

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Deployment of high temperature (>500 °C) thermal energy storage in solar power plants will make solar power more cost competitive and pave the way towards a sustainable future. In this research, a unique metallic encapsulation has been presented for thermal energy storage at high temperatures, capable of operation in aerobic conditions. This goal was achieved by employing low cost materials like carbon steel. The research work presents the unique encapsulation procedure adopted, as well as various coatings evaluated and optimized for corrosion protection. Experimental testing favored the use o

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7

Nechaev, Yury S. "Stimuli and mechanisms of diffusion mass-transport in the processes of structural-phase changes in metallic materials under high-rate deformation: Stimuli and mechanisms of diffusion mass-transport in the processesof structural-phase changes in metallic materials under high-rate deformation." Diffusion fundamentals 2 (2005) 52, S. 1-2, 2005. https://ul.qucosa.de/id/qucosa%3A14385.

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8

Pedotto, Cristina. "Using IR thermography to determine the heat flux removed by spray cooling a high-temperature metallic surface." Thesis, Manhattan, Kan. : Kansas State University, 2008. http://hdl.handle.net/2097/1044.

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9

Nechaev, Yury S. "Stimuli and mechanisms of diffusion mass-transport in the processes of structural-phase changes in metallic materials under high-rate deformation." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-196059.

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10

Arvidsson, Sofia, Lena Fransson, and Carin Lundgren. "Communication of Values : A Qualitative Study at Stena Metall." Thesis, Jönköping University, JIBS, EMM (Entrepreneurship, Marketing, Management), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-12368.

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<p><strong>Purpose: </strong>The purpose of this thesis is to investigate Stena Metall’s values and how they are communicated within the organization.</p><p><strong>Background: </strong>In the Fall of 2008, the world was shocked by the worst financial crisis in decades. The crisis had deep effects on the Swedish economy, and many companies suffered heavily. The recycling and environmental service company Stena Metall experienced their first negative result in 30 years, and 900 employees had to leave the company. An action program, including an altered culture was established with the purpose t

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11

Javed, Muhammad Tariq. "Mechanisms behind pH changes by plant roots and shoots caused by elevated concentration of toxic elements." Doctoral thesis, Stockholms universitet, Botaniska institutionen, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-64324.

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Toxic elements are present in polluted water from mines, industrial outlets, storm water etc. Wetland plants take up toxic elements and increase the pH of the medium. In this thesis was investigated how the shoots of submerged plants and roots of emergent plants affected the pH of the surrounding water in the presence of free toxic ions. The aim was to clarify the mechanisms by which these plants change the surrounding water pH in the presence of toxic ions. The influence of Elodea canadensis shoots on the pH of the surrounding water was studied in the presence of cadmium (Cd) at low initial p

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12

Millach, Carrobé Laia. "Effect of environmental changes and metal stress on phototrophic microorganisms in extree environments. Development of new methodologies in high-resolution microscopy techniques." Doctoral thesis, Universitat Autònoma de Barcelona, 2017. http://hdl.handle.net/10803/457901.

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Els efectes del canvi climàtic incideixen directament en les poblacions de microorganismes fotòtrofs dels tapissos microbians, produint alteracions en altres paràmetres ambientals com és l’increment de la temperatura, que pot provocar sequeres i fins i tot la desertització d’aquests ecosistemes, així com altres efectes en l’osmolaritat de les cèl·lules, degut a l’augment de la salinitat. Els microorganismes esmentats són molt abundants en els tapissos microbians, principalment els cianobacteris i les microalgues, que a més de ser els principals estabilitzadors d’aquests ecosistemes, al mateix

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13

Biscéré, Tom. "Effets des métaux et des changements climatiques sur les coraux." Electronic Thesis or Diss., Sorbonne université, 2018. http://www.theses.fr/2018SORUS382.

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Les récifs coralliens se sont largement dégradés au cours de ces dernières décennies sous l’influence des activités anthropiques. Parmi ces perturbations, l’augmentation des concentrations métalliques concerne de nombreux récifs à travers le monde (e.g. grande barrière australienne, Costa Rica, Mer Rouge, Nouvelle-Calédonie). A ces stress locaux vient s’ajouter le changement climatique, et plus particulièrement l’élévation des températures et l’acidification des océans, auxquelles les coraux doivent désormais faire face. Dans ce contexte particulier, les objectifs de cette thèse ont donc été (

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14

Grünker, Ronny, Irena Senkovska, Ralf Biedermann, et al. "A highly porous flexible Metal–Organic Framework with corundum topology." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-138599.

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A flexible Metal–Organic Framework Zn4O(BenzTB)3/2 (DUT-13) was obtained by combination of a tetratopic linker and Zn4O6+ as connector. The material has a corundum topology and shows the highest pore volume among flexible MOFs<br>Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich

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15

Grünker, Ronny, Irena Senkovska, Ralf Biedermann, et al. "A highly porous flexible Metal–Organic Framework with corundum topology." Royal Society of Chemistry, 2011. https://tud.qucosa.de/id/qucosa%3A27762.

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A flexible Metal–Organic Framework Zn4O(BenzTB)3/2 (DUT-13) was obtained by combination of a tetratopic linker and Zn4O6+ as connector. The material has a corundum topology and shows the highest pore volume among flexible MOFs.<br>Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.

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16

Bragaglia, Valeria. "Epitaxial Growth and Ultrafast Dynamics of GeSbTe Alloys and GeTe/Sb2Te3 Superlattices." Doctoral thesis, Humboldt-Universität zu Berlin, 2017. http://dx.doi.org/10.18452/18406.

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In dieser Arbeit wird das Wachstum von dünnen quasi-kristallinen Ge-Sb-Te (GST) Schichten mittels Molekularstrahlepitaxie demonstriert, die zu einer geordneten Konfiguration von intrinsischen Kristallgitterfehlstellen führen. Es wird gezeigt, wie es eine Strukturanalyse basierend auf Röntgenstrahlbeugungssimulationen, Dichtefunktionaltheorie und Transmissionselektronenmikroskopie ermöglicht, eine eindeutige Beurteilung der Kristallgitterlückenanordnung in den GST-Proben vorzunehmen. Das Verständnis für die Ordnungsprozesse der Gitterfehlstellen erlaubt eine gezielte Einstellung des Ordnungsgra

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17

Chen, Yu-Shuai, and 陳友帥. "Impact of Metallic Furniture on UWB Channel Statistical Characteristics." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/35843169324683821413.

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碩士<br>淡江大學<br>電機工程學系碩士班<br>94<br>Radio wave is easily effected by obstacles in indoor environments. The obstacles are walls, ceilings, furniture in indoor environment. These obstacles will cause multiple reflection and diffraction of the radio waves and the phenomenon is called as multi-path effect. Due to this multi-path effect, the intersymbol inference (ISI) which increases the bit error rate and outage probability of the communication system occurred. As a result, the quality of communication becomes worse. The bit error rate (BER) performance for ultra-wide band (UWB) indoor communication

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18

Görtan, Mehmet Okan. "Severe plastic deformation of metallic materials by equal channel angular swaging: Theory, experiment and numerical simulation." Phd thesis, 2014. https://tuprints.ulb.tu-darmstadt.de/4077/1/Dissertation_MehmetOkanG%C3%B6rtan.pdf.

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Ultrafine-grained metals produced by severe plastic deformation processes are distinguished with many outstanding mechanical properties such as a combination of high strength and ductility or improved fatigue behavior and thus can be used to meet the high strength requirements of the metal forming industry. Although several severe plastic deformation processes have been developed over the last three decades, the industrial utilization of such materials is still in an early stage. Production of bulk UFG materials is still expensive. Therefore, the few applications are limited to the sports good

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19

Kashanianfard, Mani. "Electromagnetic Wave Transmission through Sub-wavelength Channels and Bends Using Metallic Wires." Thesis, 2009. http://hdl.handle.net/10012/4654.

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Techniques and technologies to transfer electromagnetic energy through sub-wavelength channels have been researched extensively in the past few years because their application in different areas such as sub-wavelength imaging, telecommunication, increasing the storage capacity, and confinement and transmission of electromagnetic energy. Common ways of achieving such transmission includes exciting surface plasmon polaritons on both sides of the cannel or using double negative metamaterials. Recently a mechanism to squeeze the electromagnetic energy through sub-wavelength channels using material

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20

Chen, Ting-Huei, and 陳亭卉. "The studies of flow channels on the metallic bipolar plate for the performance of PEMFC." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/75147569408052095672.

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碩士<br>國立勤益科技大學<br>機械工程系<br>98<br>Nowadays, ultra fine channels and ribs cannot be formed on the commonly used graphite bipolar plates owing to low strength and brittleness of the graphite material. Therefore, this study used the stainless steel plate, SUS316L, with 1mm thick stainless, as the material of the bipolar plates, and these metallic bipolar plates are with reaction area of 20mm×20mm, height and depth of 0.8mm and ribs widths of 0.2mm, 0.4mm and 0.6mm respectively (open area rate of 85.36％, 70.24％, 58.19％,respectively). These formed metallic bipolar plates were assembled with MEA and

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21

Wang, Shung-ping, and 王祥賓. "Finite Element Analysis on Forming and Efficiency of Micro-Channels of Metallic Bipolar Plate for Fuel Cell." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/50866379950579641527.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>101<br>Bipolar plate is an important component of the fuel cell. Because there is no suitable fabrication process for mass-production of bipolar plate, the cost of portable fuel cell is still too high now a days. In this study, the rubber pad forming process was used to fabricate the micro-channels on metallic bipolar plate and the effect on process parameters of the rubber pad forming were analyzed. Polyurethane rubbers were used for the rubber pads, and SUS316L stainless steel sheets with a thickness of 0.1mm were tested in the experiment. Firstly, finite element a

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22

Soltani, Fatemeh. "Growth of metallic nanowires by chemical etching and the use of microfluidics channels to produce quantum point contacts." Thesis, 2010. http://hdl.handle.net/1828/2387.

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A self-terminated electrochemical method was used to fabricate microscopic-scale contacts between two Au electrodes in a microfluidic channel. The conductance of contacts varies in a stepwise fashion showing quantization near the integer multiples of the conductance quantum ( ). The mechanism works by a pressure-driven flow parallel to a pair of Au electrodes with a gap on the order of micron in an electrolyte of HCl. When applying a bias voltage between two electrodes, metal atoms are etched off the anode and dissolved into the electrolyte as metal ions, which are then deposited onto the cath

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23

Zhang, Yong, Irene Mei Ling Lee, Hao Tan, Qin Jing, and Yi Li. "Effect of Microstructure Changes on Mechanical Properties of La₆₆Al₁₄(Cu, Ni)₂₀ Amorphous and Crystalline Alloys." 2003. http://hdl.handle.net/1721.1/3824.

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The microstructure, and phase selections of La₆₆Al₁₄(Cu, Ni)₂₀ alloy were studied by Bridgman solidifications, and composite materials of dendrites in amorphous matrix or micro- and nano- sized eutectic matrix were formed with different cooling rates. The volume fraction of the dendrite phase reaches a maximum at the cooling rate of about 15 K/s, the secondary dendrite arm spacing λ₂ decreases from 4.3 µm to 0.6 µm with the increasing of cooling rate R, and obeys the equation of λ₂R⁰.⁵&#x2077=1.74µm(K/s)R⁰.⁵&#x2077. The compression strength, as well as the elastic strain limit of the dendrite/

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24

Müller, Georg Alexander. "Ion-beam induced changes of magnetic and structural properties in thin Fe films." Doctoral thesis, 2004. http://hdl.handle.net/11858/00-1735-0000-0006-B4EE-3.

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25

Sevastopolev, Ruslan. "Effect of conformal cooling in Additive Manufactured inserts on properties of high pressure die cast aluminum component." Thesis, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-50949.

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Additive manufacturing can bring several advantages in tooling applications especially hot working tooling as high pressure die casting. Printing of conformal cooling channels can lead to improved cooling and faster solidification, which, in turn, can possibly result in better quality of the cast part. However, few studies on advantages of additive manufactured tools in high pressure die casting are published.The aim of this study was to investigate and quantify the effect of conformal cooling on microstructure and mechanical properties of high pressure die cast aluminum alloy. Two tools each

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