Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 34 for “"Thermopower"”.
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Energy storage and generation from thermopower waves
… fuel. The reaction wave induces what we term a thermopower wave, resulting in an electrical current in the same direction. At up to 7 W/g, peak power density is larger than that of many present micro-scale power sources (e.g. fuel cells, batteries) and even about seven times greater than …
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Improving efficiency of ID thermopower wave devices and studying 2D reaction waves
… self-propagating reaction waves by launching I D thermopower waves. We demonstrated improved chemical-to-electrical conversion efficiency of these devices (from about 10-⁴ % to 10-² %) by operating with newer fuels such as sodium azide and sucrose with potassium nitrate on single-walled carbon …
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Thermogravimetric, thermopower, and electrical conductivity studies of the Ba₂YCu₃O₇₋ₓ system
… system was investigated using thermogravimetric, thermopower, and d.c. electrical conductivity techniques. The system was found to exhibit a semiconductor to metallic transition coincident with the documented orthorhombic to tetragonal phase transition. Conduction is accomplished in the …
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Thermoelectric properties of mesoscopic systems in GaAs
… heterostructures. In particular, we study the thermopower of two-dimensional mesoscopic systems (2DMSs) and antidot lattices defined in them. Quantum oscillations in the thermopower (TP) of a quantum point contact allow accurate determination of the local electron temperature. The low …
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The transport properties of superconducting-normal interfaces
… the whole range between 0.3T$_c$ and T$_c$ The thermopower of these samples near T$_c$ was also found to have the temperature dependence predicted by previous theory. The results imply that the thermopower of indium changes in a discontinuous and systematic way at T$_c$ This is at variance with …
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Probing Electronic and Thermoelectric Properties of Single Molecule Junctions
… junction conductance (at low and high bias) and thermopower. We present measurements on a variety of molecular families and study how conductance depends on the character of the linkage (metal-molecule bond) and the nature of the molecular backbone. We start by describing a novel way to construct …
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ΦΑΙΝΟΜΕΝΑ ΜΕΤΑΦΟΡΑΣ ΑΜΟΡΦΩΝ ΗΜΙΑΓΩΓΩΝ
… PROPERTIES SUCH AS D.C. DARK CONDUCTIVITY, THERMOPOWER,PHOTOCONDUCTIVITY, CPM ADOPTICAL ABSORPTION WERE APPLIED TO SPUTTERED AMORPHOUS GE SE BIX AND AMORPHOUS HYDROGENATED SILICON A-SI:H FILMS FROM GLOW DISCHARGE. IT WAS FOUND THAT ADDITION OF 15,6 AT % BI LEADS TO AN INCREASE OF TEN …
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Fabrication of Quantum Effect Devices and Their Characterization in the Ballistic Transport Regime
… propagating path across the modulated channel. Thermopower study across the same structure suggests the formation of a similar one-dimensional channel, which is probably due to disordered potential fluctuations across the channel.
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Quantum theory of electronic and thermal transport through nano-scale and single-molecule devices
… The shifting of this resonance enhances the thermopower S is expected when the junction is tuned through a node in the transmission function. We found supramolecular π-π interactions between two molecules changed the sign of thermopower. I have investigated a family molecules with various …
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Heat, Charge and Spin Transport of Thin Film Nanostructures
… look at work measuring enhanced contributions to thermopower and thermal conductivity of unique ferromagnetic metals. We observe improved thermopower due to the ultra-low damping of the magnon system. For spintronic and spin caloritronic applications, having a low damping is important for device …
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CHARGE AND SPIN TRANSPORT STUDIES IN GRAPHENE AND BLACK PHOSPHORUS
… with a recent theoretical prediction of high thermopower factor in black phosphorus. The published works on graphene spintronics described in this thesis are both scientifically enlightening and technologically promising. We have also demonstrated the first thermoelectric response in few layer …
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Thermische Tieftemperatureigenschaften von Seltenerd-Übergangsmetall-Borkarbiden
… such as specific heat, thermal conductivity and thermopower. The influence of structural disorder, caused by stoichiometric variations and substitutions of the rare earth element or the transition metal, on the thermal and superconducting low-temperature properties is investigated. The structural …
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Critical behavior and transport properties of lanthanum manganite
The resistivity, thermopower, magnetization, and ac heat capacity ofLa0.7Ca0.3Mn03, La0.7(Ca,Pb)0.3Mn03, and Lao.7Sro.3Mn03 single crystals have been measured over a broad temperature range in fields of up to 70 kOe. Below Tc, all three samples exhibit a strong T 2 temperature dependence, …
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Technology and engineering of liquid lithium for fusion applications
… wetting characteristics, and relative thermopower of liquid lithium with a variety of potential substrate candidates for the LiMIT concept. Experiments on the wetting characteristics of the lithium used the contact angle as a metric. Among those materials investigated are 316 stainless …
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Thermoelectric properties of Bi₁âx̳Sbx̳ nanowires and lead salt superlattice nanowires
… transition can be clearly identified. Enhanced thermopower is observed for BilxSbx nanowires as the diameter decreases or as the Sb content increases, indicating that both quantum confinement effects and Sb alloying effects are important for improving the thermo-electric performance.
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Thermal, Electrical, and Spin Transport: Encompassing Low-Damping Ferromagnets and Antiferromagnetic/Ferromagnetic Heterostructures
… conductivity, electrical resistivity, and thermopower of thin films, and the Hall bar design for exploring spin-related phenomena such as the spin Seebeck effect and spin Hall magnetoresistance. These devices pave the way for new explorations in the realms of thermoelectrics, spintronics, …
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Quantum theory of sensing and thermoelectricity in molecular nanostructures
… two symmetric molecules derived from it and the thermopower of the asymmetric molecule is the algebraic mean of their thermopowers”.
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Thermal, Magnetic, and Electrical Properties of Thin Films and Nanostructures: From Magnetic Insulators to Organic Thermoelectrics
… conductivity, electrical conductivity, and thermopower of thin films. The size- and temperature-dependent properties of two types of semiconducting single-walled carbon nanotube thin films deposited and measured on these platforms reveal differing phonon contributions to thermal …
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Strongly correlated electron behavior in transition metal intermetallics: enhanced thermoelectricity and quantum criticality in FeGa₃ and superconductivity in NiBi₃
… narrow band gap semiconductors with large n-type thermopower below room temperature. Chemical doping drastically changes physical properties and thermoelectric properties enhances by large percentage over the pure compounds. An important structural feature of FeGa3 is the fact that the four Fe …
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Nanometer-scale temperature measurements of phase change memory and carbon nanomaterials
… using macroscopic and SJEM measurements. The thermopower of GST thin films depends on the local grain structure and has potential to significantly decrease future PCM energy consumption. This dissertation presents nanometer-scale thermometry measurements of Joule and thermoelectric effects in …
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