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Dissertations / Theses on the topic 'Temperature-Dependent Materials'

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1

Bulmer, John Simmons. "Temperature and Frequency Dependent Conduction Mechanisms Within Bulk Carbon Nanotube Materials." Wright State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=wright1290546481.

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2

Fujita, Takahiro. "Temperature-dependent tensile and shear response of graphite/aluminum." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/101371.

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The thermo-mechanical response of unidirectional P100 graphite fiber/6061 aluminum matrix composites (v<sub>f</sub> = 0.47) was investigated at four temperatures: -150°F, +75°F, +250°F and +500°F, using test methods developed at Virginia Tech. Two types of tests, off-axis tension and Iosipescu shear, were used to obtain the desired properties. Good experimental-theoretical correlation was obtained for E<sub>xx</sub>, v<sub>xy</sub> and G₁₂. It is shown that E₁₁ is temperature independent, but E₂₂, v₁₂ and G₁₂ generally decrease with increasing temperature. Compared with rather high longitudina
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3

Speriatu, Lucian M. "Temperature dependent mechanical properties of composite materials and uncertainties in experimental measurements." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0011370.

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4

Chu, Edison C. (Edison Chinghing). "Temperature-dependent yield properties of passivated aluminum thin films on silicon wafers." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/41414.

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5

Carbeck, Jeffrey Davis. "Temperature dependent structure and properties of crystalline poly(vinylidene fluoride) from molecular simulation." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/11247.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1996.<br>Includes bibliographical references (leaves 129-134).<br>by Jeffrey Davis Carbeck.<br>Ph.D.
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6

Khan, Kamran-Ahmed. "A time integration scheme for stress - temperature dependent viscoelastic behaviors of isotropic materials." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1146.

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7

Yang, Weixuan. "Temperature-dependent homogenization technique and nanoscale meshfree particle methods." Diss., University of Iowa, 2007. http://ir.uiowa.edu/etd/147.

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8

Yancey, Robert Neil. "Radiation and temperature effects on the time-dependent response of T300/934 graphite/epoxy." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43072.

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A time-dependent characterization study was performed on T300/934 graphite/epoxy in a simulated space environment. Creep tests on irradiated and non-irradiated graphite/epoxy and bulk resin specimens were carried out at temperatures of 72 °F and 250 °F. Irradiated specimens were exposed to dosages of penetrating electron radiation equal to 30 years 'exposure at GEO-synchronous orbit. Radiation was shown to have little effect on the creep response of both the composite and bulk resin specimens at 72 °F while radiation had a significant effect at 250 °F. A healing process was shown to be pre
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9

Brandt, Josef. "Temperature Dependent Size Exclusion Chromatography for Investigating Thermoreversibly Bonding Polymer Systems." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-207589.

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Polymers capable of thermally controlled reversible bonding reactions are promising candidates for stimuli responsive materials, as required for self-healing or drug delivery materials. In order to investigate how the dynamic reactions can be controlled, effective analytical tools are demanded that are capable of analyzing not only the polymers but can also monitor the respective bonding reactions. Herein, we employ size exclusion chromatography in a newly developed temperature dependent mode (TD SEC) for the in situ characterization of polymers that undergo retro Diels-Alder (rDA) reaction at
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10

Norhashim, Nurhakimah. "Temperature dependent photoluminescence of erbium doped YAG, zinc nitride and manganese-doped cadmium selenide optical materials." Thesis, University of Surrey, 2017. http://epubs.surrey.ac.uk/814013/.

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Temperature dependent studies of a selection of materials including erbium-doped yttrium aluminum garnet (Er:YAG), zinc nitride nanocrystals(NCs) and manganese-doped cadmium selenide (CdMnSe) NCS have been undertaken in order to determine their fundamental optical properties. The study is based upon the measurement of their photoluminescence (PL) and PL transient decay transient over the temperature range of 300K to 5K. For the Er:YAG samples, two different sample types are studied as a function of erbium concentration that are a fast-cooled (mono-phase) and a slow-cooled (bi-phasic) polycryst
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11

Mavlonov, Abdurashid, Steffen Richter, Wenckstern Holger von, Rüdiger Schmidt-Grund, Michael Lorenz, and Marius Grundmann. "Temperature dependent self-compensation in Al- and Ga-doped Mg0.05 Zn0.95O thin films grown by pulsed laser deposition." American Institute of Physics, 2016. https://ul.qucosa.de/id/qucosa%3A31212.

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We studied the doping efficiency of Al and Ga dopants in (Mg,Zn)O alloys as a function of the growth temperature and post growth annealing times. High-temperature growth results in the highest structural quality and highest electron mobility; the doping efficiency is limited by the dopant’s solubility. It was investigated in detail that a low growth temperature is needed to achieve free carrier densities above the solubility limit of the dopants. Samples grown at temperatures of 300 °C and below have a free carrier density significantly above the solubility limit yielding the minimum resistivi
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12

Caraballo, Simon. "Thermo-Mechanical Beam Element for Analyzing Stresses in Functionally Graded Materials." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3024.

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Modeling at the structural scale most often requires the use of beam and shell elements. This simplification reduces modeling complexity and computation requirements but sacrifices the accuracy of through-the-thickness information. Several studies have reported various design approaches for analyzing functionally graded material structures. One of these studies proposed a two-node beam element for functionally graded materials (FGMs) based on first order shear deformable (FOSD) theory. The derivation of governing equations included spatial temperature variation. However, only the constant temp
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13

Patzak, Joerg. "Mechanisches Verformungsverhalten von Tragschichten ohne Bindemittel unter besonderer Berücksichtigung des Temperatureinflusses." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-194640.

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Im Straßenbau sind Tragschichten ohne Bindemittel (ToB) die konstruktive Grundlage des frostsicheren Oberbaus unabhängig von der Bauweise oder der Belastungsklasse. Das mechanische Verformungsverhalten von ToB ist sowohl durch elastische als auch durch plastische Verzerrungen geprägt, wobei die Größe der jeweiligen Dehnungen/Stauchungen u. a. von der Art und Größe der Beanspruchung abhängt. Erschwerend kommt der Einfluss unterschiedlichster, derartige Gemische beeinflussender Randbedingungen hinzu. Verwiesen sei z. B. auf die Materialdichte, den Wassergehalt, Korngrößenverteilungen oder die Ko
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14

MAGNOZZI, MICHELE. "Temperature-dependent optical properties of composite plasmonic nanomaterials." Doctoral thesis, Università degli studi di Genova, 2019. http://hdl.handle.net/11567/941310.

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15

Almansour, Amjad Saleh Ali. "USE OF SINGLE TOW CERAMIC MATRIX MINICOMPOSITES TO DETERMINE FUNDAMENTAL ROOM AND ELEVATED TEMPERATURE PROPERTIES." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron148640184494135.

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16

Tallapally, Venkatesham. "Colloidal Synthesis and Photophysical Characterization of Group IV Alloy and Group IV-V Semiconductors: Ge1-xSnx and Sn-P Quantum Dots." VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5568.

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Nanomaterials, typically less than 100 nm size in any direction have gained noteworthy interest from scientific community owing to their significantly different and often improved physical properties compared to their bulk counterparts. Semiconductor nanoparticles (NPs) are of great interest to study their tunable optical properties, primarily as a function of size and shape. Accordingly, there has been a lot of attention paid to synthesize discrete semiconducting nanoparticles, of where Group III-V and II-VI materials have been studied extensively. In contrast, Group IV and Group IV-V based n
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17

Simmler, Urs. "PTC Creo Simulate 3.0." Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-171761.

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18

Hsu, Chin-Yuan, and 許晉源. "Temperature dependent studies on thermoelectric materials Bi2Te3-xSex." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/25680958751118269188.

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碩士<br>國立東華大學<br>材料科學與工程研究所<br>88<br>The thermoelectric properties (thermoelectric power, thermal conductivity and electric conductivity) of bismuth telluride and its solid solutions were measured. Both the crystal structure and band structure are complicated by the substitution of tellurium atoms by higher electronegative selenium atoms. Consequently, all the thermoelectric properties of the materials are altered by this substitution. A Vertical Bridgman Method was employed to prepare crystals of Bi2Te3-xSex with x=0.3, 0.6, 0.9, 1.2 and 1.5. Sample quality and crystal structures we
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19

Hsu, Hsuan-Tsung, and 許烜綜. "Temperature-Dependent Dielectric Spectroscopy for Phase Transition Temperature Measurement of Blue-Phase Materials." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/6gx45h.

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碩士<br>國立交通大學<br>光電系統研究所<br>103<br>This thesis focuses on phase behaviors of blue-phase-liquid-crystal (BPLC) materials. The phase-transition temperatures and ionic behaviors of BPLC materials are investigated by means of temperature-dependent dielectric spectroscopy. By introducing BPLCs into planar-aligned cells, the phase sequence and transition temperatures between two adjacent mesophases of three distinct BPLC mixtures (R5011-doped HDE, R5011-doped E7, and S811-doped E7) are clarified according to the data of the first and the second derivatives of the real-part dielectric permittivity at
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20

"Temperature Dependent Qualities of Amorphous Silicon and Amorphous Silicon Carbide Passivating Stacks." Master's thesis, 2016. http://hdl.handle.net/2286/R.I.40230.

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abstract: Layers of intrinsic hydrogenated amorphous silicon and amorphous silicon carbide were prepared on a polished, intrinsic crystalline silicon substrate via plasma-enhanced chemical vapor deposition to simulate heterojunction device relevant stacks of various materials. The minority carrier lifetime, optical band gap and FTIR spectra were observed at incremental stages of thermal annealing. By observing the changes in the lifetimes the sample structure responsible for the most thermally robust surface passivation could be determined. These results were correlated to the optical band ga
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21

Govender, Stanton Wesley. "Parametric studies on the temperature dependent behaviour of steel structures within a fire context." Thesis, 2012. http://hdl.handle.net/10413/9120.

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The mechanical and material properties of structural steel at elevated temperatures play an important role in structural fire design. The South African 350W and S355 structural steels are common in building structures with S355 slowly replacing the older 350W. The cost and feasibility of full scale fire tests are some of the causes for the lack of experimental data on the behaviour of steel structures when exposed to fire. Therefore excessively conservative design codes based on isolated laboratory experiments are used in practice which leads to increased material costs. Another area of concer
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22

Kumar, Dipanjan. "Interaction of PbTe with and its alloys at diffusion bonded interfaces: Temperature dependent evolution of phases and microstructure." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5724.

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The past years have seen an increasing interest in high-efficient thermoelectric materials because of their promising application to harvest the widely distributed waste heat. Realizing high-efficient TE materials into actual devices remains a challenge. The suitability of thermoelectric material is judged by a dimensionless parameter called thermoelectric figure-of-merit, zT. The efficiency of a thermoelectric (TE) device depends on material parameters and, to a large extent, on joints/contacts these semiconducting materials form with metallic conductors for completing an electrical circuit.
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23

Okamoto, James Kozo. "Temperature-dependent extended electron energy loss fine structure measurements from K, L23, and M45 edges in metals, intermetallic alloys, and nanocrystalline materials." Thesis, 1993. https://thesis.library.caltech.edu/4941/1/Okamoto_jk_1993.pdf.

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This dissertation developed the extended energy loss fine structure (EXELFS) technique. EXELFS experiments using the Al K, Fe L23 and Pd M45 edges in the elemental metals gave nearest-neighbor distances which were accurate to within ± 0.1 A. In addition, vibrational mean-square relative displacements (MSRD) derived from the temperature dependence of the EXELFS compared favorably with predictions from published force constant models derived from inelastic neutron scattering data. Thus, information about "local" atomic environments can be obtained not only from K edges, but from L23 and M45 edge
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24

Patzak, Joerg. "Mechanisches Verformungsverhalten von Tragschichten ohne Bindemittel unter besonderer Berücksichtigung des Temperatureinflusses: Experimentelle Analyse am Beispiel einer Kiestragschicht." Doctoral thesis, 2015. https://tud.qucosa.de/id/qucosa%3A29185.

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Im Straßenbau sind Tragschichten ohne Bindemittel (ToB) die konstruktive Grundlage des frostsicheren Oberbaus unabhängig von der Bauweise oder der Belastungsklasse. Das mechanische Verformungsverhalten von ToB ist sowohl durch elastische als auch durch plastische Verzerrungen geprägt, wobei die Größe der jeweiligen Dehnungen/Stauchungen u. a. von der Art und Größe der Beanspruchung abhängt. Erschwerend kommt der Einfluss unterschiedlichster, derartige Gemische beeinflussender Randbedingungen hinzu. Verwiesen sei z. B. auf die Materialdichte, den Wassergehalt, Korngrößenverteilungen oder die Ko
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25

Taglienti, Carmine. "High Strain Rate Dynamic Response of Aluminum 6061 Micro Particles at Elevated Temperatures and Varying Oxide Thicknesses of Substrate Surface." 2018. https://scholarworks.umass.edu/masters_theses_2/668.

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Cold spray is a unique additive manufacturing process, where a large number of ductile metal micro particles are deposited to create new surface coatings or free-standing structures. Metallic particles are accelerated through a gas stream, reaching velocities of over 1 km/s. Accelerated particles experience a high-strain-rate microscopic ballistic collisions against a target substrate. Large amounts of kinetic energy results in extreme plastic deformation of the particles and substrate. Though the cold spray process has been in use for decades, the extreme material science behind the deformati
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26

Γραμματικόπουλος, Σπυρίδων. "Μελέτη, χαρακτηρισμός και ιδιότητες νέων υλικών υψηλής τεχνολογίας". Thesis, 2013. http://hdl.handle.net/10889/6740.

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Το αντικείμενο της παρούσας Διδακτορικής Διατριβής είναι η ανάπτυξη νέων υλικών για σύγχρονες τεχνολογικές εφαρμογές. Για αυτό τον λόγο, επιλέχτηκε κατ’ αρχήν να αναπτυχθεί μια καινούρια και ταυτόχρονα πρωτότυπη διαδικασία παρασκευής νανοσωματιδίων. Για το σκοπό αυτό σχεδιάστηκε και ανακατασκευάστηκε εξ’ αρχής μια υπάρχουσα συσκευή sputtering, εφαρμόζοντας νέες τεχνικές και διατάξεις για την εναπόθεση των λεπτών και υπέρλεπτων υμενίων χρυσού σε διαφορετικές θερμοκρασίες υποστρώματος. Παρασκευάστηκαν δείγματα σε κρυογενικές θερμοκρασίες εναπόθεσης (-195 oC) έως και σε υψηλές Θερμοκρασίες των 4
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