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 49 for “"Peltier"”.
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Sensorless temperature estimation and control of Peltier devices
Peltier devices, also known as thermoelectric devices (TEDs), are solid state junctions of two dissimilar materials in which heat transfer and electrical conduction are coupled. A current running through a TED causes heat to flow; likewise, the presence of an external temperature gradient will …
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The Effects of Peltier Marking on Semiconductor Growth in a Magnetic Field
… magnetic field with the additional effects of Peltier marking. The magnetic field is strong enough that inertial effects can be neglected and that viscous effects are confined to boundary layers. The objective of this research is a first step in the development of a method to accurately predict …
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Obtención de agua potable por medio de refrigeración con celdas peltier a partir de condensación de aire atmosférico
l texto expone el impacto del desarrollo industrial global en el clima, especialmente en países como Estados Unidos, contrastándolo con naciones latinoamericanas como Colombia, que enfrentan problemas similares aunque con menor avance industrial. Destaca la importancia de facilitar el acceso a …
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Bacteria mediated heat sinks
… liquid phase. The model was validated using a Peltier device to freeze water by applying a constant DC current, and because the inefficiency of the module decreases with decreasing temperature, the heat dissipating power of the thermoelectric eventually equalizes with the ambient losses, …
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Reaction calorimetry applied to kinetic problems. The design and construction of an isothermal calorimeter with heat compensation by the Peltier effect, and the application of the calorimeter in the study of reaction kinetics in solvent/water mixtures.
An isothermal calorimeter controlled by the Peltier effect has been designed and constructed in order to investigate reaction rates in solventwater mixtures. Because a thermal method was used a constant temperature environment was essential and this was achieved by using a water bath controlled to …
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Generalized drift-diffusion for microscopic thermoelectricity
… commerical device simulation package to explore Peltier cooling at a basic p-n junction. This framework should enable the design of spatially-inhomogenenous thermoelectric elements and internally-cooled micro-electronic devices.
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Electrocaloric applications based on multilayer capacitors of PbSc₀.₅Ta₀.₅O₃
… as the EC working body in a device where Peltier elements that separate it from a load and sink are synchronously driven at constant current and voltage. This protocol is found to increase the efficiency of Peltier cooling, but device optimization is required to evaluate meaningful …
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Multi-Scale Design, Thermal Simulation, Fabrication, Surface Engineering and Characterization of TPMS Structures for Atmospheric Water Generation
… Surfaces (TPMS) as condensation surfaces in Peltier-driven AWG systems—an approach that departs from traditional flat or finned designs. This multiscale engineering strategy integrates macroscale geometry optimization, microscale surface roughness control, and nanoscale analysis of surface …
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Thermal and Optical Simulations of Vertical Cavity Surface Emitting Lasers
… novel treatment is applied to model distributed Peltier heat at a heterojunction by use of a Monte Carlo simulation. Peltier heat is found to be a major heat contributor, and it results in a rapid and high temperature rise in the separate confinement heterostructure (SCH) region of the laser …
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Artificial Anisotropy for Transverse Thermoelectric Heat Flux Sensing
… in thermoelectric theory are the Seebeck and Peltier effects. The Seebeck effect is the generation of a voltage in a device that consists of two different materials in the presence of a temperature gradient, while the Peltier effect is the generation of a temperature gradient across a device …
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Cryogenic optical refrigeration
… has been achieved, outperforming multi-stage Peltier coolers. Further cooling below the NIST-defined cryogenic temperature of 123K is shown feasible for for this record cooling sample given sufficient absorbed power. With an order of magnitude improvement to parasitic background absorption, …
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Cryogenic optical refrigeration: Laser cooling of solids below 123 K
… in a crystalline host, outperforming multi-stage Peltier coolers. A novel technique probing local temperature changes experimentally verifies the cooling efficiency model with expected cooling to 93 K with the current crystal. With modest improvements to parasitic background absorption through the …
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Thermal pumping of light-emitting diodes
… we refer to as "thermal pumping", results from Peltier energy exchange from the lattice to charge carriers when current is injected into an LED. For an applied voltage V such that qV < (hw), where q is the electron charge and (hw) is the average emitted photon energy, thermal pumping can greatly …
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Oxide based thermoelectric materials for large scale power generation
… (TE) devices are based on the Seebeck and Peltier effects, which describe the conversion between temperature gradient and electricity. The effectiveness of the material performance can be described by its figure of merit, ZT, which is defined as ZT = [alpha]²[sigma]T / [kappa] , where a is …
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VISUAL CUES EFFECTS ON TEMPERATURE PERCEPTION
… the visual cues of an objects’ temperature and a Peltier thermo-device to provide the tactile temperature stimuli. The results confirmed our initial expectation that participants RTs are longer for incongruent stimuli than congruent stimuli. The results also showed that participants rated cold …
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Short-Term Visual Deprivation, Tactile Acuity, and Haptic Solid Shape Discrimination
… (Facchini & Aglioti, 2003; Weisser, Stilla, Peltier, Hu, & Sathian, 2005). The current study investigated the effects of visual deprivation on two unique tactile tasks. While Facchini and Aglioti observed significant effects of visual deprivation, neither Wong, Hackeman, Hurd, and Goldreich …
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A study of information security awareness program effectiveness in predicting end-user security behavior
… end-user risk mitigation for a number of years (Peltier, 2013; Tsohou, Karyda, Kokolakis, & Kiountouzis, 2015; Vroom & Solms, 2004). By studying the human factors that increase security risks, more effective security frameworks can be implemented. This study focused on testing the effectiveness …
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Continuous production of conducting polymer
… and electrolyte concentrations. A system of peltier thermoelectric coolers and refrigerated-circulator held the deposition chamber at -10⁰C. The polypyrrole film deposited onto the surface of a rotating glassy carbon crucible was peeled off using a blade and spring force mechanism. The …
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Beyond the Headlines: Exploring Media Portrayal of Youth Climate Change Activists
… Greta Thunberg, currently 18, and Autumn Peltier, 17, a Canadian Indigenous activist and Chief Water Commissioner of the Anishinabek Nation. By employing Foucault’s theory of discourse and power, the sociology of childhood, and the United Nations Convention on the Rights of the Child …
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Small-scale thermoelectric generator for off-grid power
… of producing power through a TEG as well as a Peltier device under different configurations and weather conditions.
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