Bibliografie tematiche / TEGs

Letteratura scientifica selezionata sul tema "TEGs"

Autore: Grafiati

Pubblicato: 8 giugno 2024

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Articoli di riviste sul tema "TEGs":

Gogoc, Szymon, e Przemyslaw Data. "Organic Thermoelectric Materials as the Waste Heat Remedy". Molecules 27, n. 3 (2 febbraio 2022): 1016. http://dx.doi.org/10.3390/molecules27031016.

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The primary reason behind the search for novel organic materials for application in thermoelectric devices is the toxicity of inorganic substances and the difficulties associated with their processing for the production of thin, flexible layers. When Thomas Seebeck described a new phenomenon in Berlin in 1820, nobody could have predicted the future applications of the thermoelectric effect. Now, thermoelectric generators (TEGs) are used in watches, and thermoelectric coolers (TECs) are applied in cars, computers, and various laboratory equipment. Nevertheless, the future of thermoelectric materials lies in organic compounds. This paper discusses the developments made in thermoelectric materials, including small molecules, polymers, molecular junctions, and their applications as TEGs and/or TECs.

Liu, Qiulin, Guodong Li, Hangtian Zhu e Huaizhou Zhao. "Micro thermoelectric devices: From principles to innovative applications". Chinese Physics B 31, n. 4 (1 aprile 2022): 047204. http://dx.doi.org/10.1088/1674-1056/ac5609.

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Thermoelectric devices (TEDs), including thermoelectric generators (TEGs) and thermoelectric coolers (TECs) based on the Seebeck and Peltier effects, respectively, are capable of converting heat directly into electricity and vice versa. Tough suffering from low energy conversion efficiency and relatively high capital cost, TEDs have found niche applications, such as the remote power source for spacecraft, solid-state refrigerators, waste heat recycling, and so on. In particular, on-chip integrable micro thermoelectric devices (μ-TEDs), which can realize local thermal management, on-site temperature sensing, and energy harvesting under minor temperature gradient, could play an important role in biological sensing and cell cultivation, self-powered Internet of Things (IoT), and wearable electronics. In this review, starting from the basic principles of thermoelectric devices, we summarize the most critical parameters for μ-TEDs, design guidelines, and most recent advances in the fabrication process. In addition, some innovative applications of μ-TEDs, such as in combination with microfluidics and photonics, are demonstrated in detail.

Camut, Julia, Eckhard Müller e Johannes de Boor. "Analyzing the Performance of Thermoelectric Generators with Inhomogeneous Legs: Coupled Material–Device Modelling for Mg2X-Based TEG Prototypes". Energies 16, n. 9 (24 aprile 2023): 3666. http://dx.doi.org/10.3390/en16093666.

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Thermoelectric generators (TEGs) possess the ability to generate electrical power from heat. As TEGs are operated under a thermal gradient, inhomogeneous material properties—either by design or due to inhomogeneous material degradation under thermal load—are commonly found. However, this cannot be addressed using standard approaches for performance analysis of TEGs in which spatially homogeneous materials are assumed. Therefore, an innovative method of analysis, which can incorporate inhomogeneous material properties, is presented in this study. This is crucial to understand the measured performance parameters of TEGs and, from this, develop means to improve their longevity. The analysis combines experimental profiling of inhomogeneous material properties, modelling of the material properties using a single parabolic band model, and calculation of device properties using the established Constant Property Model. We compare modeling results assuming homogeneous and inhomogeneous properties to the measurement results of an Mg2(Si,Sn)-based TEG prototype. We find that relevant discrepancies lie in the effective temperature difference across the TE leg, which decreases by ~10%, and in the difference between measured and calculated heat flow, which increases from 2–15% to 9–16% when considering the inhomogeneous material. The approach confirms additional resistances in the TEG as the main performance loss mechanism and allows the accurate calculation of the impact of different improvements on the TEG’s performance.

Faheem, Muhammad, Muhammad Abu Bakr, Muntazir Ali, Muhammad Awais Majeed, Zunaib Maqsood Haider e Muhammad Omer Khan. "Evaluation of Efficiency Enhancement in Photovoltaic Panels via Integrated Thermoelectric Cooling and Power Generation". Energies 17, n. 11 (27 maggio 2024): 2590. http://dx.doi.org/10.3390/en17112590.

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Among renewable resources, solar energy is abundant and cost effective. However, the efficiency and performance of photovoltaic panels (PVs) are adversely affected by the rise in the surface temperature of solar cells. This paper analyzes the idea of utilizing thermoelectric modules (TEMs) to enhance the efficiency and performance of PV panels. The proposed hybrid solar thermoelectric generation (HSTEG) system employs TEMs as thermoelectric coolers (TECs) to enhance panel efficiency and as thermoelectric generators (TEGs) to convert excess heat into additional electricity. This study includes an extensive evaluation of the proposed idea using MATLAB Simulink and experimental validation in indoor as well as outdoor environments. The use of TECs for the active cooling of the PV system leads to an increase in its efficiency by 9.54%. Similarly, the passive cooling by TECs along with the additional power generated by the TEGs from the excessive heat led to an increase in the efficiency of the PV system of 15.50%. The results demonstrate the HSTEG system’s potential to significantly improve PV panel efficiency and energy generation, offering a promising avenue for advancing solar energy technology.

Sanin-Villa, Daniel, Oscar Danilo Montoya e Luis Fernando Grisales-Noreña. "Material Property Characterization and Parameter Estimation of Thermoelectric Generator by Using a Master–Slave Strategy Based on Metaheuristics Techniques". Mathematics 11, n. 6 (9 marzo 2023): 1326. http://dx.doi.org/10.3390/math11061326.

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Thermoelectric generators (TEGs) have gained significant interest as a sustainable energy source, due to their ability to convert thermal energy into electrical energy through the Seebeck effect. However, the power output of TEGs is highly dependent on the thermoelectric material properties and operational conditions. Accurate modeling and parameter estimation are essential for optimizing and designing TEGs, as well as for integrating them into smart grids to meet fluctuating energy demands. This work examines the challenges of accurate modeling and parameter estimation of TEGs and explores various optimization metaheuristics techniques to find TEGs parameters in real applications from experimental conditions. The paper stresses the importance of determining the properties of TEGs with precision and using parameter estimation as a technique for determining the optimal values for parameters in a TEG mathematical model that represent the actual behavior of a thermoelectric module. This methodological approach can improve TEG performance and aid in efficient energy supply and demand management, thus reducing the reliance on traditional fossil fuel-based power generation.

Attar, Alaa, Mohamed Rady, Abdullah Abuhabaya, Faisal Albatati, Abdelkarim Hegab e Eydhah Almatrafi. "Performance Assessment of Using Thermoelectric Generators for Waste Heat Recovery from Vapor Compression Refrigeration Systems". Energies 14, n. 23 (6 dicembre 2021): 8192. http://dx.doi.org/10.3390/en14238192.

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This article reports on an experimental analysis and performance assessment of using thermoelectric generators (TEGs) for waste heat recovery from residential vapor compression refrigeration systems. The analysis shows that there is a good opportunity for waste heat recovery using TEGs by de-superheating refrigerant after the compressor. Design and manufacturing of a de-superheater unit consisting of a tube and plate heat exchanger and thermoelectric generator modules (HE-TEGs) have been performed and integrated in an experimental test rig of R134a refrigeration cycle. Experimental assessment of the performance parameters, as compared to the basic refrigeration system, reveals that the overall coefficient of performance (COP) using HE-TEGs desuperheater unit increases by values ranging from 17% to 32% depending on the condenser and evaporator loads. Exergy analysis shows that the enhancement is attributed to reduction in the exergy destruction in the condenser and compressor due to lower values of condenser pressure and pressure ratio of the compressor. The output power of the HE-TEGs unit is found to be sufficient for driving the TEGs heat sinks air cooling fan, thus providing a passive de-superheating system without an additional external source of electricity. Further enhancement of the refrigeration cycle performance can be achieved by installation of additional HE-TEGs units.

Singh, Yogesh, Satyendra kumar Singh e Purnima Hazra. "Future Prospect of Rare Earth Element Free Materials for Thermoelectric Generators". ECS Transactions 107, n. 1 (24 aprile 2022): 453–64. http://dx.doi.org/10.1149/10701.0453ecst.

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Almost all traditional energy sources are on the point of rapid depletion due to over use. There is demand for alternative renewable energy sources, and thermoelectric generators (TEGs) are one of the rising solutions. TEGs are a new class of solid-state devices that transform waste heat energy directly into electricity using Seebeck effect. The efficiency of TEGs is governed by dimensionless quantity called Figure of merit (ZT), which plays an important role to determine the overall sustainability of TEGs. Traditional thermoelectric generators have a poor efficiency (12-20%), which is a disadvantage. To obtain higher value of ZT, the prime emphasis is given towards material engineering as the efficiency solely depends on the materials selection. The investigation is on earth-abundant, cost-effective, low-toxic innovative nanomaterials. In addition, the paper covers various elements for TEGs with prime focus towards rare earth free materials and their emerging trends.

Mashburn, Paulla, Jodie Ecklund e Jeffrey Riley. "Do Heparinase Thrombelastographs Predict Postoperative Bleeding?" Journal of ExtraCorporeal Technology 28, n. 4 (dicembre 1996): 185–90. http://dx.doi.org/10.1051/ject/1996284185.

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Postoperative hemorrhage is a major cause of morbidity and mortality in patients who undergo cardiopulmonary bypass (CPB). The thrombelastograph (TEG) is a viscoelastic whole blood test that measures clot dynamics from clot formation through clot lysis. Previous studies have shown that post-bypass TEGs are accurate predictors of postoperative bleeding. TEGs from heparinized blood reversed with heparinase may be employed during CPB to evaluate coagulation. CPB heparinase TEGs may allow for earlier recognition of patients who may bleed after bypass. Earlier TEG analysis would allow targeting of specific therapies to begin before the patient bleeds excessively. Fifty-four heparinase TEGs during warming and fifty-four native TEGs post-protamine administration were collected. Parameters evaluated were R, K, alpha angle, MA, MA60, coagulation index, activated clotting time. hematocrit, prothrombin time, partial thromboplastin time, thrombin time, fibrinogen concentration, platelet count, blood loss during and after CPB, and blood and blood product administration. Coagulation indexes for CPB heparinase TEGs that were less than -2 or heparinase TEGs that were fibrinolytic were 87% accurate in predicting patients with excessive intraoperative blood loss, but were not predictive of blood product administration. The sensitivity was 12.5% and the specificity was I 00% in predicting excessive intraoperative bleeding. Post-protamine coagulation index inversely correlated with intraoperative red blood cell administration (r=-0.403, p<0.05), but was not predictive. Patients with fibrinolytic TEGs required blood products to compensate for expected blood loss associated with the fibrinolytic state. Simultaneous routine coagulation tests did not correlate significantly with blood loss or blood product administration, nor were they predictive. The findings of this study suggest that the presence of fibrinolysis in either a heparinase TEG on bypass or a post-protamine TEG is the most important predictor of blood and blood product administration. But, since only 20% of the patients in the study exhibited fibrinolytic TEGs, a study that included a much larger sample of patients would need to be done to confirm this finding.

Faraj, Jalal, Wassim Salameh, Ahmad Al Takash, Georges El Achakr, Hicham El Hajj, Cathy Castelain e Mahmoud Khaled. "Dual harvesting from exhaust gas of diesel generators using thermoelectric generators and cold water tank". Journal of Physics: Conference Series 2754, n. 1 (1 maggio 2024): 012021. http://dx.doi.org/10.1088/1742-6596/2754/1/012021.

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Abstract The present work concerns a dual harvesting concept applied to exhaust gas of Diesel generators using thermoelectric generators and cold water tank. To proceed, a simplified thermal modelling is developed and appropriate parametric analysis of power generation with the TEGs and heat recovered is conducted in function of the Diesel generator power and the TEG thermal conductivity and thickness. It was shown that powers up to 534 W can be generated with the TEGs and heat recovery rates up to 4463 W can be obtained for a Diesel generator power of 125 kW. Also, it was shown that the temperature difference across the TEGs and the power generated increase exponentially when the Diesel generator power and ratio of thickness to thermal conductivity of TEGs increase.

Morais, Flávio, Pedro Carvalhaes-Dias, Luís Duarte, Anderson Spengler, Kleber de Paiva, Thiago Martins, Andreu Cabot e José Siqueira Dias. "Optimization of the TEGs Configuration (Series/Parallel) in Energy Harvesting Systems with Low-Voltage Thermoelectric Generators Connected to Ultra-Low Voltage DC–DC Converters". Energies 13, n. 9 (6 maggio 2020): 2297. http://dx.doi.org/10.3390/en13092297.

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Solar radiation and human activity generate ubiquitous temperature gradients that could be harvested by thermoelectric generators (TEGs). However, most of these temperature gradients are in the range of very few degrees and, while TEGs are able to harvest them, the resulting output voltages are extremely small (a few hundreds of mV), and DC–DC converters are necessary to boost them to usable levels. Impedance matching between TEGs and DC–DC converter plays a fundamental role in the energy harvesting efficiency. Therefore, it is essential to determine the output power of the system in different configurations, in order to decide on the optimum TEG connection. Here, we present an electronic circuit to measure the maximum power that can be harvested with low-voltage TEGs connected to a DC–DC converter. The developed circuit is an electronic controlled load that drains the maximum current from the output of the DC–DC converter while maintaining its output voltage at the maximum allowed value. Using a mechanical set-up able to apply precise low temperature gradients between the hot and cold side of the TEGs, experimental data using different configurations of TEGs are obtained. The measured results show that, for ultra-low voltages, the TEG ensemble’s output impedance plays an important role not only in the amount of the energy scavenged, but also in the onset temperature of the energy harvesting.

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Tesi sul tema "TEGs":

Lönn, Anders, e Tomas Nyberg. "Utbyte mellan Polishögskolan i Umeå och Tegs centralskola". Thesis, Umeå University, Basic training programme for Police Officers, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-27271.

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Tegs central skola har tidigare varit en s.k. problemskola, men har numer ett mycket bättre rykte. Vi har fått antydningar om att det finns ett stort intresse från skolan och föräldrarna till eleverna, att polisen ska komma till skolan och informera ungdomarna om t.ex. alkohol/droger och mobbing. Tyvärr har polisen i dagens läge vare sig resurser eller tid att fullt ut tillmötesgå dessa önskemål. Tanken med vårt arbete är att skaffa oss en uppfattning om det är möjligt, och om intresse finns att starta ett förhoppningsvis långvarigt samarbete mellan Tegs central skola och polisutbildningen i Umeå. Vi vill ta reda på vilka problemområden som finns på skolan och i slutändan kunna presentera idéer om hur man tillsammans ska kunna arbeta för att minimera dessa problem. Arbetet kommer att visa på olika faktorer som ligger bakom ungdomars inträde i kriminaliteten, och även idéer om hur ett samarbete mellan skolorna skulle kunna se ut kommer att presenteras

Roepsch, Jodi Ann. "Characterizaton of Triethoxyfluorosilane and Tetraethoxysilane Based Aerogels". Thesis, University of North Texas, 2001. https://digital.library.unt.edu/ark:/67531/metadc2999/.

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Aerogels are highly porous, low dielectric constant (low k) materials being considered by the semiconductor industry as an interlayer dielectric. Low k materials are needed to overcome capacitance problems that limit device feature sizes. Precursors triethoxyfluorosilane (TEFS) and tetraethoxysilane (TEOS) were used to prepare bulk aerogels. Samples were prepared by sol-gel methods, and then carbon dioxide supercritically-dried. Effects of varying the water to precursor ratio were studied with respect to aerogel properties and microstructure. Methods of analysis for this study include FTIR-ATR, TEM, RBS, EDS, SEM, dielectric constant determination by impedance and surface area by gas adsorption. Si-F bonds were determined to be present in both acid- and base-catalyzed TEFS as well as HF-catalyzed TEOS. Fluorine promotes a fractal network microstructure as opposed to a particle-like microstructure. Surface area and dielectric constant were determined to increase slightly with increases in the water to precursor ratio.

Hartman, Jennifer. "Alignment of Middle School Core TEKS with Visual Arts TEKS". Thesis, University of North Texas, 2010. https://digital.library.unt.edu/ark:/67531/metadc33160/.

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This descriptive study uses a qualitative, content analysis to examine the middle school visual arts and core Texas Essential Knowledge and Skills (TEKS) to determine the potential common learning activities that can be aligned between the two. By performing an alignment of the potential common learning activities present in the middle school visual art TEKS and the middle school core TEKS, I demonstrate that there is a foundation for curriculum integration in the Texas middle school visual arts classroom.

Oulfarsi, Mostafa. "Contribution à l’amélioration de la fiabilité de modules thermoélectriques : développement de solutions matériaux alternatives". Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0228.

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La conversion d’énergie à partir de la chaleur perdue par effets thermoélectriques (effet Seebeck) est une nouvelle source d’énergie renouvelable potentielle. La technologie thermoélectrique (TE) est néanmoins limitée à des applications terrestres de niche du fait de son faible rendement (5-6 %), mais aussi à cause des défis technologiques à surmonter pour éviter une dégradation des générateurs TE (GTE) employés. Notre thèse s’inscrit dans cette problématique dans le cadre d'un programme de recherche soutenu par l’ANR (projet RELIATEG) incluant comme partenaires la société HotBlockOnBoard (HBOB), le CEA LITEN, le CIRIMAT et l'IJL. L'objectif est de fiabiliser les GTE à base de siliciures, Mg₂Si₁₋ₓSnₓ pour le type n et de MnSi₁₊ᵧ pour le type p, fabriqués par HBOB pour une utilisation à long terme au voisinage de 400-500°C. Notre rôle consiste principalement à comprendre les mécanismes conduisant à leur fragilisation, notamment en ce qui concerne les problèmes d'oxydation du matériau Mg₂Si₀,₆Sn₀,₄. Ceux-ci étant inévitables, nous nous sommes tournés vers la solution de trouver un revêtement protecteur et de tester la stabilité thermique sous air d’un matériau Mg₂Si₁₋ₓSnₓ, moins sensible. Après avoir établi une synthèse bibliographique traitant des notions de base de la TE, de l'état de l’art des matériaux TE et justifié le choix des matériaux utilisés par HBOB, nous présentons les diverses étapes de la fabrication des GTE et les techniques expérimentales utilisées pour caractériser la microstructure des matériaux TE et leur stabilité thermique. Les tests de performance réalisés sur des GTE à quatre jambes montrent que la puissance obtenue, mesurée jusqu'à 450°C, est reproductible pour les 25 modules testés. Elle est toutefois environ 25 % plus faible que celle que l'on pourrait atteindre avec un GTE parfait, comme le montre les simulations que nous avons réalisées à l'aide du logiciel Comsol MultiPhysics. Les tests de stabilité ont montré que les modules sont stables sous air à 250°C, durant 500 h ou sous 1000 cycles, et qu'ils commencent à se dégrader sous air dès 350°C par le biais d'un phénomène de peste lié à l'oxydation du matériau TE Mg₂Si₀,₆Sn₀,₄ du côté chaud du GTE. Sous vide, ce processus est ralenti mais la présence d'oxygène résiduel ne permet pas de totalement stabiliser le matériau. A 500°C sous air, la peste est observée dès 3 heures de test. Les tests d'oxydation menés sur les deux matériaux à teneur en Sn différente ont permis de montrer le rôle déterminant de l'étain sur les phénomènes d'oxydation. Un modèle expliquant le phénomène de peste a pu être développé grâce à l'analyse combinée des résultats obtenus par des mesures thermogravimétriques, microscopie électronique à balayage et diffraction des rayons X. En nous appuyant sur la bibliographie et sur les diagrammes de phases des différents systèmes, des revêtements protecteurs céramiques, siliciures métalliques, métaux et verres ont été étudiés. Plusieurs voies de dépôt ont été explorées : frittage par Spark Plasma Sintering, nickelage électrochimique, pack cémentation, dépôts par pulvérisation (slurry, PVD et spray). Les revêtements les plus prometteurs ont été obtenus avec un verre dont le CET est proche de celui du matériau de type n
Energy conversion from waste heat through thermoelectric effects (Seebeck effect) is a potential new renewable energy source. The thermoelectric (TE) technology is nevertheless limited to niche terrestrial applications due to its low efficiency (5-6%), but also due to the technological challenges to be overcome to avoid a degradation of the TE generators (TEG). Our thesis is devoted to this problem within the framework of a research program supported by the ANR (RELIATEG project) including HotBlockOnBoard (HBOB), CEA LITEN, CIRIMAT and IJL as partners. The objective is to make reliable the TEG, manufactured by HBOB, based on silicides, Mg₂Si₁₋ₓSnₓ (n-type) and MnSi₁₊ᵧ (p-type), for long-term use in the vicinity of 400-500°C. Our main role is to understand the mechanisms leading to their embrittlement, particularly to the oxidation problems linked to the Mg₂Si₀,₆Sn₀,₄ material. As they are unavoidable, we turned to the solutions of finding a protective coating and/or testing the thermal stability under air of a Mg₂Si₁₋ₓSnₓ material, less sensitive to oxidation. After a bibliographical synthesis of the basic concepts of TE and of the state of the art of TE materials, the choice of materials used by HBOB have been justified. The various stages of TEG manufacturing and the experimental techniques used to characterize the microstructure of TE materials and their thermal stability are presented. The performance tests performed on TEGs show that the power obtained, measured up to 450°C, is reproducible for the 25 devices tested. However, it is about 25% lower than what one could achieve with a perfect TEG, as shown by the simulations we carried out using the Comsol MultiPhysics software. The stability tests showed that the devices are stable under air at 250°C, for 500 hours or under 1000 cycles, and that they begin to degrade under air at 350°C through a pesting phenomenon linked to the oxidation of Mg₂Si₀,₆Sn₀,₄. Under vacuum, this process is slowed down but the presence of residual oxygen does not completely stabilize the material. At 500°C under air, the pesting is observed from 3 hours of testing. The oxidation tests carried out on the two materials with different Sn content showed the significant role of tin on the oxidation phenomena. A model explaining the pesting phenomenon was developed by the combined analyses of results obtained by thermogravimetric measurements, scanning electron microscopy and X-ray diffraction. On the basis of bibliography and phase diagrams of the differents systems, protective coatings based on ceramics, metallic silicides, metals and glasses have been studied. Several deposition methods were explored: sintering by Spark Plasma Sintering, electrochemical nickel plating, pack cementation, slurry, PVD and spray deposits. The most promising coatings were obtained with a glass whose CTE is close to that of the n-type material

Nakasēs, Athanasios. "O naos tēs Athēnas Makistu /". Athēna : Tameio Archaiologikōn Porōn kai Apallotriōseōn, 2004. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=014734171&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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Roper, Nick. "South Tees diabetes mortality study". Thesis, University of Newcastle upon Tyne, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399543.

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Tarnoff, David. "Episode 3.02 – Tens Complement Arithmetic". Digital Commons @ East Tennessee State University, 2020. https://dc.etsu.edu/computer-organization-design-oer/18.

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In 1645, Blaise Pascal presented his Pascaline to the public. Using only addition and the method of tens complement, the device could add, subtract, multiply, and divide. We discuss tens complement as an introduction to signed representations in binary.

Ierokēpiōtēs, Kōstas G. "Ē ellēnikē ekpaideusē stēn eparchia Paphu (1878-1960) : symbolē stēn istoria tēs ekpaideusēs tēs Kypru /". Leukōsia : Politistikes Hypēresies Hypurgeiu Paideias kai Politismu, 2004. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=020301014&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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Campagne, Ibarcq Claudie. "Tels serviteurs, tels maîtres : la représentation des domestiques dans la peinture vénitienne de la Renaissance". Paris, EHESS, 2015. http://www.theses.fr/2015EHES0051.

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Les peintures vénitiennes de la Renaissance contiennent de très nombreuses figures de domestiques, rarement remarquées par le spectateur. Leur recensement systématique et la constitution de séries ont permis de montrer que ces détails sont peu naturalistes et rarement décoratifs. Les figures de serviteurs relèvent le plus souvent d'un discours symbolique concernant souvent les maîtres, c'est-à-dire l'idée que les élites se font de leur place dans la société, en particulier durant la deuxième moitié du XVIe siècle, plus aristocratique. Mais les peintres peuvent aussi faire porter par ces figures des discours variés, politiques, littéraires, théologiques, voire artistiques ou satiriques. En effet, les serviteurs, figures du popolo, ont à Venise plus qu'ailleurs, droit de cité dans la représentation picturale, puisque le patriciat aime à considérer que les Vénitiens forment une communauté unie. L'étude systématique des domestiques de peinture a également conduit à réinterroger certaines œuvres bien connues, qui comportaient des figures de serviteurs faisant écart par rapport à la tradition ou à la 'norme' contemporaine. L'étude de ces dissonances a permis d'apporter un éclairage nouveau sur ces œuvres de Carpaccio, Titien, Tintoret et Véronèse
Renaissance Venetian paintings include many servants, who often escape the notice of those who view them. A systematic statistical inventory of those servant figures and their grouping into different categories have made it obvious that those figures are hardly ever realistic or decorative but are most of the time an integral part of a symbolic system focusing on their masters' place in society and of the elite's conception of its social role, in particular during the more aristocratic second half of the sixteenth century. On the other hand, servant figures may be used to express views on varied subjects, either literary, theological or political, or even with an artistic or satirical goal in mind. Indeed, servants, figures of the popolo, have a legitimate place in pictorial representation in a city such as Venice where the Patricians like to think of the community as united. The systematic study of servants in painting has also led to a new questioning of well-known works when they include servant figures which differ from traditional or contemporary norms. The study of those discrepancies has shed a new light on those works by Carpaccio, Titian, Tintoretto and Veronese

Frangelakis, Fotios. "Controlling and upscaling laser induced surface morphology : from tens of microns to tens of nanometres". Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0021/document.

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L’Industrie actuelle demande des produits à haute valeur ajoutée offrant des nouvelles fonctions à moindre coût. Parmi les fonctions on peut citer la coloration de surface, le noircissement de surface, la réduction des frottements, la génération de surface anti-réflexion, anti-bactérienne, superhydrophobe ou anti-formation de glace. Les surfaces fonctionnelles présentes dans la nature nous indiquent que ces propriétés uniques sont possibles par des texturations de surface à l’échelle micro et nanométrique adéquates.Parallèlement à cela, la technologie laser révolutionne le champ des possibles en termes de texturation de surface et permet de reproduire ces fonctions inspirées du monde du vivant en modifiant la morphologie et la chimie de surface. Néanmoins, le développement et le déploiement de telles techniques de texturation laser au niveau industriel nécessite la levée de trois verrous. Le premier est de connecter les propriétés macroscopiques (couleur, résistance mécanique, stabilité chimique, vieillissement) et la morphologie de surface aux échelles nano et microscopiques. Le second d’acquérir une parfaite maîtrise de la morphologie de surface à ces échelles. Le troisième est la transposition du procédé développé en laboratoire en procédé industriel adapté aux traitements de grandes surfaces avec des temps de cycles les plus courts possibles. Nous avons étudié plusieurs techniques de texturation de surface à l’échelle submicronique par laser femtoseconde. Ainsi des « ripples » de quelques dizaines de nanomètres ont être réalisées par laser UV. L’irradiation avec double impulsion apporte une capacité supplémentaire dans le contrôle de la morphologie de surface finale. Différents types de structures, avec différentes symétries, ont ainsi été produites en jouant sur le délai entre les deux impulsions. Des structures LIPSS homogènes triangulaires ou carrées ont été obtenues pour des délais inférieurs à 5 ps et 500 ps respectivement. Des paramètres opératoires, en particulier la fluence et la polarisation, ont été identifiés comme jouant un rôle majeur dans les caractéristiques de la morphologie de surface finale. Des expériences complémentaires ont montré que des résultats similaires peuvent être obtenus en utilisant des cristaux biréfringents pour générer des délais courts. Nous avons également exploré la possibilité d’utiliser des trains d’impulsions uniques pour produire des texturations de surface de dimensions caractéristiques supérieures allant de quelques microns à plusieurs dizaines de microns en faisant varier de manière systématique la fluence, la dose énergétique et le taux de répétition du laser. La comparaison de résultats expérimentaux avec ceux issus de simulation nous avons mis en évidence le rôle majeur de l’accumulation thermique sur les dimensions caractéristiques des structures générées par laser. Par ailleurs, nous avons démontré la capacité du procédé à produire de texturations sub-longueurs d’onde, homogènes, sur des surfaces supérieures à 1 cm², avec des lasers ayant des taux de répétitions allant jusqu’à 10 MHz et des systèmes de positionnement innovants. Des nano-rugosités de surface ainsi produites affichent des propriétés de super hydrophobicité. A titre d’exemple, nous avons atteint un temps de texturation de l’ordre de 1 min/cm², soit 60 fois inférieurs à ce que nous obtenions en début des travaux. Enfin, nous avons démontré un temps de 9 s/cm² pour le noircissement de surface.Ces travaux de recherche, mettant à profit des sources laser et des équipements de déflection optique de dernière génération, apportent une contribution significative dans la compréhension des mécanismes d’une part, et dans la capacité à contrôler et à produire de telles texturations sur des grandes surfaces d’autre part. Ils devraient favoriser une dissémination rapide de ces technologies de texturation laser dans l’industrie
Current industrial markets demand highly value-added products offering new features at a low-cost. Among the most desired functionalities are surface colouring and blackening, anti-icing, anti-biofouling, wear reduction and anti-reflectivity. Laser surface processing holds a virtually endless potential in surface functionalization since it can generate versatile surface properties by modifying surface morphology and chemistry. Nevertheless, developing functional surfaces for implementation in the industry requires action on three levels. The first is to connect the macro-scale surface properties (colour, mechanical resistance, chemical stability, ageing) and the micro & nano-scale morphology. The second is to increase the level of control over the laser induced morphology in the near micron and submicron scale. The third is to upscale the lab-developed process both in terms of processed area and cycle time. Functional textures found in nature can be used as a guideline for connecting the surface texture with the surface property. It is well established that different textures can enable different functionalities. Nevertheless, the level of control of the laser induced morphology has to be improved significantly in order to allow one to mimic nature’s examples. Increase of control requires an in-deep understanding of the physical mechanisms that lead to nanostructure formation. To this end, we carry out a comprehensive parametric study of fs processing on stainless steel. The impact of wavelength, overlap, fluence, dose, repetition rate, polarization and interpulse delay in the induced morphology was investigated.We investigate several techniques to achieve controlled laser structuring in the submicron regime. Ripples of a few tens of nanometres were obtained with a UV laser. Double pulses were employed to further control the submicron structures. Structures of different size and symmetry were obtained in different delays underlining the key role of the interpulse delay (Δτ). Homogeneous triangular and square 2D-LIPSS were obtained for Δτ smaller than 5 ps and 500 ps, respectively. Process parameters and particularly fluence and polarization were found to play also a role in the laser induced feature characteristics. In a complementary set of experiments, we show that similar results can be obtained for small delays with a robust setup of birefringent crystals. In the above micron regime, trains of single pulses were employed for controlling the surface morphology. Fluence, dose and repetition rate, were varied to show a systematic variation of spikes in the range of tens of micrometers. Combining our experimental results with simulation data we underline the key role of heat accumulation on the structures size. Finally, we proposed an upscaling strategy showing the possibility to exploit repetition rates up to 10 MHz for laser texturing.In the upscaling part, areas much larger than the spot size were textured homogenously using high repetition rate laser and innovative laser positioning systems. Nanometric ripples induced by UV laser act as a subwavelength grating. Laser induced nano roughness exhibits superhydrophobic properties. Uniform distribution of well-defined, sub-wavelength, 2D-LIPSS was successfully generated over ~1 cm2. The final surface exhibits multiple axis iridescence giving a holographic effect. Employing a 10 MHz laser surface was textured at a rate of ~ 1 min/cm2 almost 60 times faster compared to our starting point. Lastly, surface blackening was achieved at a rate of ~ 9 sec/cm2.In conclusion, valuable data were provided both in surface functionalization, in understanding and controlling of laser induced structuring and in upscaling a lab developed process. We believe that our results open the way for exploiting fs laser texturing in everyday applications employing up to date laser sources and positioning systems

Più fonti

Libri sul tema "TEGs":

Vavouskos, Anastasios Kōn, e Anastasios Kōn Vavouskos. Themeliōdeis arches tēs ekklēsiastikēs dikonomias tēs ekklēsias tēs Ellados: Ē archē tēs exasphaliseōs tēs anexartēsias kai tēs amerolēpsias tōn organōn aponomēs tēs ekklēsiastikēs dikaiosynēs. Thessalonikē: Etaireia Makedonikōn Spoudōn, 2003.

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Tsirimōkou, Lizy. Grammatologia tēs polēs, logotechnia tēs polēs, poleis tēs logotechnias. Athēna: Lōtos, 1988.

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Tsirimōkou, Lizy. Grammatologia tēs polēs, logotechnia tēs polēs, poleis tēs logotechnias. Athēna: Lōtos, 1988.

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Katsinēs, Mētsos. Tēs leuterias kai tēs eirēnēs. Athēna: To Hellēniko Vivlio, 1990.

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Kaloutsa-Maurokephalou, Lilē. Tēs phōtias kai tēs erēmias. Athēna: "Nea Synora" Ekdotikos Organismos Livanē, 1997.

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Burton, Katherine, e Katherine Burton. Tess. Toronto: Harlequin Books, 1989.

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Hughes, Mary. Tecs. Llandysul: Gwasg Gomer, 1987.

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Tennant, Emma. Tess. London: HarperCollins, 1993.

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Reekie, Jocelyn. Tess. Vancouver, B.C: Raincoast, 2002.

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Tennant, Emma. Tess. Halifax: Remploy Press, 1994.

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Capitoli di libri sul tema "TEGs":

Nikitin, Mikhail, e Sergey Skipidarov. "The Nature of Heat Exchange of Human Body with the Environment and Prospects of Wearable TEGs". In Thin Film and Flexible Thermoelectric Generators, Devices and Sensors, 207–19. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-45862-1_8.

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Rennels, Donald C., e Hobart M. Hudson. "Tees". In Pipe Flow, 177–200. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118275276.ch16.

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Latham, David W. "TESS". In Encyclopedia of Astrobiology, 1660. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_1574.

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Gooch, Jan W. "Tego". In Encyclopedic Dictionary of Polymers, 731. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_11596.

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Latham, David W. "TESS". In Encyclopedia of Astrobiology, 2481. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_1574.

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Bohnen, R. "TEMS". In Taktische Medizin, 379–87. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-39689-2_27.

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Bolmont, Emeline, e Marion Cointepas. "TESS". In Encyclopedia of Astrobiology, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-642-27833-4_5566-1.

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Musselwhite, David. "Tess". In Social Transformations in Hardy’s Tragic Novels, 108–44. London: Palgrave Macmillan UK, 2003. http://dx.doi.org/10.1057/9780230504523_5.

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Latham, David W. "TESS". In Encyclopedia of Astrobiology, 1. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-27833-4_1574-2.

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Bolmont, Emeline, e Marion Cointepas. "TESS". In Encyclopedia of Astrobiology, 3018–19. Berlin, Heidelberg: Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-65093-6_5566.

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Atti di convegni sul tema "TEGs":

Sullivan, Owen, Saibal Mukhopadhyay e Satish Kumar. "Thermoelectric Generators Embedded in Microelectronic Chip". In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87953.

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Thermoelectric generators (TEGs) can significantly improve the net power consumption and battery life of the mobile devices or high performance devices by generating power from the waste heat of these devices. Recent advancements show that the ultrathin thermoelectric devices can be fabricated and integrated within a microelectronic package. This paper first investigates the power generation by a single ultrathin TEG embedded within a micro-electronic package considering several key factors such as load resistance, chip heat flux, and proximity of the TEG to chip. We observe that the power generation from TEGs increases with increasing background heat flux on chip or when TEGs are moved closer to the chip. After the investigation of a single TEG, an array of embedded TEGs is considered in order to analyze the influence of multiple TEGs on total power generation and conversion efficiency. Increasing the number of TEGs from one to nine increase the useful power generation from 72.9 mW to 378.4 mW but decreases the average conversion efficiency from 0.47% to 0.32%. This suggests that average power generated per TEG gradually decrease from 72.9 mW to 42.0 mW when number of TEGs is increased from one to nine. However, the total useful power generated using nine TEGs is significant and emphasize the benefits of using embedded TEGs to reduce net power consumption in electronics packages.

Kishita, Yusuke, Michinori Uwasu, Hiroyuki Takeda, Keishiro Hara, Yuji Ohishi e Masashi Kuroda. "Assessing the Greenhouse Gas Emissions and Cost of Thermoelectric Generators for Passenger Automobiles: A Life Cycle Perspective". In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34483.

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Toward realizing a low-carbon society, a thermoelectric generator (TEG) is promising for energy harvesting by generating electricity from thermal energy, especially waste heat. While there are various technologies available for energy recovery, one of the strengths of TEGs is to retrieve usable energy from waste heat whose temperature is as low as 200∼300 degrees Celsius. Yet, the conversion efficiency of the current thermoelectric materials remains low at 5∼10%, which makes it difficult to diffuse TEGs in our society. In order to clarify required performances of TEGs to diffuse them in the future, this paper aims to assess the life cycle CO2 emissions (LCCO2) and life cycle cost (LCC) of TEGs based on several product lifecycle scenarios, each of which assumes different future situations in, e.g., conversion efficiency of TEGs. In this paper, we focus on TEGs for passenger automobiles since a range of the temperatures of their exhaust gas is suitable for TEGs. Additionally, we focus on bismuth telluride (Bi-Te) materials to develop TEGs since they have already been available for commercial use. A case study of installing Bi-Te TEGs in passenger automobiles is carried out. The region of interest is Suita City, Osaka, Japan. By describing two scenarios that assume different conversion efficiency of thermoelectric materials, we compare assessment results from the viewpoints of LCCO2 and LCC. The results reveal that using TEGs has the potential to reduce CO2 emissions of the city by 0.07∼0.30%. It is also shown that the TEG cost needs to be drastically reduced to make the usage of TEGs profitable.

Yan, Baoyu, Gen Li, Hongfen Cao, Xiaozhong Wang, Zhongcheng Wang e Yulong Ji. "Experimental Study on the Effect of Interface Heat Transfer on Performance of Thermoelectric Generators". In ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/mnhmt2019-4156.

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Abstract Thermoelectric generators (TEGs) have attracted more and more attention for their usage in waste heat recovery techniques. A key challenge in thermoelectric power conversion is to create a significant temperature difference across the TEG. The interface heat transfer between heat exchanger and TEGs plays a key role in TEGs’ performance when the heat exchanger and TEGs have been determined. In this paper different thermal interface materials (TIMs) were used to create different interface heat transfer conditions. Firstly, the thermal interface conductance of TIMs is measured by using a steady state method. Then the performance of TEGs at different interface heat transfer condition was evaluated. It was found that interface heat transfer between heat exchanger and TEGs has a significant effects on the performance of TEGs.

Arifeen, Shams U., Victor Wolemiwa, Dominic Nwoke, Lyudmyla L. Barannyk, Gabriel P. Potirniche, Aicha Elshabini e Fred Barlow. "Finite Element Analysis and Fatigue Life Prediction of an Aluminum Alloy Braze for High Temperature Thermoelectric Generator Package Assembly". In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-38829.

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Thermoelectric generators (TEGs) are solid state devices that convert thermal energy into electrical energy using the Seebeck effect. They can be used for energy harvesting in trucks and passenger vehicles by taking advantage of the temperature difference between the exhaust pipes and ambient environment. The key issue with thermoelectric devices today is the demand for increased operating temperatures while maintaining adequate reliability and low cost. Since, TEGs are subjected to sub-critical thermal cyclic loading, ensuring satisfactory reliability is important for commercially viable products. TEGs used in passenger vehicles should be able to withstand extreme environmental conditions such as high temperature, shock and mechanical vibration [1]. Since the operating temperatures of TEGs can reach temperatures higher than 500 °C, aluminum brazes offer a good high temperature solution for die attach applications. The thermoelectric materials of TEGs are prone to oxidation and sublimation. A solution to minimize these phenomena is to enclose the TEG device in a hermetic package. This paper analyzes the reliability of aluminum alloy braze Al 718 (12% Si, 88% Al) used in TEG packages under fatigue loading. A power cycling temperature fluctuation method was employed to simulate the operating conditions of the TEGs for passenger vehicle. Low cycle fatigue simulations were performed using the direct cyclic approach embedded in the finite element software ABAQUS. Direct cyclic approach uses an extrapolation technique, which allows for efficient and computationally inexpensive simulations. The numerical model was validated using experimental test data. A validated damage model was used to analyze the cyclic damage evolution in the aluminum alloy braze for the hermetic TEG packages.

Zhou, Siyi, Bahgat G. Sammakia, Bruce White, Peter Borgesen e Cheng Chen. "Enhancement of the Power-Conversion Efficiency for Thermoelectric Generators". In ASME 2013 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ipack2013-73225.

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Constrained by low thermodynamic efficiencies, thermoelectric generators (TEGs) require a comparatively large amount of heat to produce a given quantity of electricity. Therefore, further improvements in thermoelectric designs are needed. In this paper, a coupled-field thermoelectric model, which presents a rigorous interfacial energy balance by capturing Joule heating, Seebeck, Peltier and Thomson effects, is developed to gauge the feasibility of the two promising solutions to enhance power generated by the TEGs, utilizing the commercial FEA package COMSOL™ through the Physics Interface Builder. First, the patterned topography on wall surfaces is implemented and the improved performance has been observed by introducing stirred flows into the heat exchangers and equalizing the temperature across the channels. Referring to the analysis, approximately 10% enhancement in power generation can be addressed for the base-relief TEG. Second, the prospect of increasing the thermal transport capability of water by loading CuO nanoparticles in the TEGs with multi-scale heat exchangers is explored. It is found that the conversion performance of the water/CuO nanofluid-based TEG is superior when compared to the water-based TEG at the micro-scale, where the flow rate is relatively low. The significant insight is gained to fabricate the ideal TEGs with optimum power performance.

Lin, Chih Chieh, Hanfei Chen, Mahder Tewolde, Gaosheng Fu, Di Liu, Tao Zhang, He Tao et al. "Thermoelectrically Powered Sensing for Small Modular Reactors". In ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ht2013-17788.

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This project aims to develop thermoelectric generator (TEG)-based devices for sensing during normal and off-normal conditions in Small Modular Reactors (SMRs). TEGs will be placed on key reactor components including pipes, pump housings, heat exchangers and reactor vessels. The heat is conducted by heat pipes to the TEGs and removed by a heat sink in natural convection. The electrical power generated by is then used to drive sensors and wireless communications. The estimated power generated by one TEG is 19 W, and sensors with related circuit only require less than 7 W. Extra power can be stored into batteries and used for actuation and similar high-current, short duration power needs. Initial enclosure designs are also presented to protect the electrical devices from fire, force, water, and radiation. Preliminary experiments have been set up for testing TEGs. An experimental test stand design has been simulated, and is now being built. Radiation dosage at different locations and its effects on electrical devices and TEGs are also investigated. A fin analysis of the cooling side of the TEG is also presented. According to the results, the annular finned-tube with an inner pipe diameter of 58 cm can provide a maximum heat dissipation of 1,700 W.

Coday, Eric, Jordan Parker, Randall Johnson e Shawn Duan. "Design and Analysis of an Innovative Portable Water-Cooled Thermoelectric Generator Apparatus". In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10804.

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Abstract Thermoelectric generator technology can be utilized as a renewable energy source and has untapped potential. Thermoelectric generators (TEGs) have been used by industry experts to make some thermodynamic processes slightly more efficient. However, TEGs can be operated in a manner that allows for greater energy production at a higher efficiency and in a stand-alone setting. This paper presents design and analysis of an innovative portable water-cooled thermoelectric generator apparatus. The apparatus can create clean energy using optimal heat transfer through the device. To reduce the amount of power lost to internal heat resistance, the device is cooled by a large body of water. Solar irradiation is the primary heat source for the TEGs and is absorbed using copper foil and high emissive paint. The temperature differential predicted during device operation was modeled using ANSYS. The ANSYS heat transfer model revealed that heat absorption and subsequent transfer to a body of water was possible without exceeding the operating parameters of the TEGs. Experimental results revealed that a 120°C temperature difference across the TEGs produced 12.5 V of electricity. Analysis of the water-cooled TEG prototype performance revealed that power production is possible, and the design has numerous applications.

Lee, Soochan, Nishant Singh, Patrick E. Phelan e Carole-Jean Wu. "Harvesting CPU Waste Heat Through Pyroelectric Materials". In ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ipack2015-48421.

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Modern CPUs generate considerable wasted heat due to increased power dissipation from high-performance computation. Lots of research effort has extensively focused on using thermoelectric generators (TEGs) to harvest CPU waste heat to increase overall system energy efficiency. To harvest waste heat using TEGs requires a significant temperature differential between the processor as a heat source and the heat spreader/heat sink, as well as a high heat flow. However, the heat-to-electricity conversion efficiency is typically limited to 15 to 20 percent, due to large heat conductivity, low Seebeck coefficient, and low figure of merit of TEGs. In addition, TEGs on a CPU could significantly increase CPU junction temperature compared to the baseline CPU temperature due to its high thermal resistance. Contrary to using TEGs to harvest waste heat from a fixed, spatial temperature differential, this paper presents an approach to harvest CPU waste heat using pyroelectric (PE) materials from the time-varying, temporal temperature differential that is common in current processors. PE materials can generate electricity when subjected to a temporal temperature gradient. The operation of PE materials is distinctly different from TEGs and they have the following advantages. First, the theoretical efficiency is up to 50% using thin films. Second, the overall optimization of PE material is easier than thermoelectric material, since the conversion ratio, the ratio of net harvested energy divided by the heat taken from the hot reservoir, of PE material is independent of the material properties, whereas that of TEG is highly dependent on material properties. Although PE material is also a long-researched energy harvesting material, it is less explored by researchers compared to TEG in the application domain of processor waste heat management. In this paper, we review current PE materials in terms of pyroelectric coefficient and thermal conductivity, and also investigate the harvested power generation from CPU waste heat in a modern computing system.

Dove, Megan, Jaideep Pandit, Srinath Ekkad e Scott Huxtable. "Experimental Validation of Temperature Distributions Across a Heat Exchanger for a Thermoelectric Generator". In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88282.

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Thermoelectric generators (TEGs) are currently a topic of interest in the field of energy harvesting for automobiles. In applying TEGs to the outside of the exhaust tailpipe of a vehicle, the difference in temperature between the hot exhaust gases and the automobile coolant can be used to generate a small amount of electrical power to be used in the vehicle. The amount of power is anticipated to be a few hundred watts based on the temperatures expected and the properties of the materials for the TEG. This study focuses on developing efficient heat exchanger modules in order to maximize the power generation for a given vehicle and TEG. A computational fluid dynamics (CFD) model run by the authors has provided performance predictions for various cases on the cooling side of the heat exchanger. This paper discusses the setup and results of the experimental validation for the CFD model for the proposed TEG heat exchanger module.

Najeeb, Ovais Ahmed Bin, Rasish Khatri, Liping Zheng e Jeremy Liu. "The Development of Turboexpander-Generators for Gas Pressure Letdown Part 3: Design Validation". In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-82293.

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Abstract This paper is a follow-up to GT2021-60125 (“Design and Analysis”) and GT2021-60317 (“Economic Analysis”), which collectively covered the design, analysis, and economics of innovative Turboexpander Generators (TEG) used in pressure letdown (PLD) applications. This paper describes the testing data of a family of TEGs, 280 kW and 125 kW, for natural gas pressure letdown applications. The TEGs are supported by active magnetic bearings (AMB). Machine design for the two TEGs is very similar for ease of manufacturing and control system design, with wheel design being the primary difference. A comprehensive controls analysis and AMB closed-loop dynamics study were presented earlier. This paper compares predicted and measured transfer functions along with the pre and post brush seals installation data. Drop testing results on the touchdown bearing are shown along with the full-speed touch-down events. Active front-end variable speed drive (VSD) design is presented along with the power generation results. Finally, measured force vs deflection data is presented for a tolerance ring, used as the resilient element for the touchdown bearings.

Rapporti di organizzazioni sul tema "TEGs":

Neville, Kelly. Training Environment Support System (TESS). Fort Belvoir, VA: Defense Technical Information Center, febbraio 2003. http://dx.doi.org/10.21236/ada413042.

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Jaison, Shaleena. TEDS Operating Modes and Control Strategies. Office of Scientific and Technical Information (OSTI), giugno 2023. http://dx.doi.org/10.2172/1986471.

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ministerråd, Nordisk. Utviklingen i nordisk arverett - tegn i tiden. Nordic Council of Ministers, febbraio 2013. http://dx.doi.org/10.6027/tn2013-517.

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Michelsen, Gunnar. Grenseløse tegn? – Mobilitet og tegnspråk i Norden. Nordens välfärdscenter, maggio 2021. http://dx.doi.org/10.52746/ishc6013.

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Tegnspråklige med redusert hørsel opplever i dag grensehinder når de krysse nordiske landegrenser. Forskjeller i regelverk, praksiser, saksbehandlingstid, tilgjengelighet på tegnspråktolker og fravær av et felles nordisk personnummer eller ID-nummer er noen av barrierene som tegnspråklige møter. Personer med funksjonsnedsettelser står overfor flere og andre grensebarrierer enn personer uten funksjonsnedsettelser når de reiser og flytter til et annet nordisk land. Tegnspråklige er avhengige av tegnspråk for å samhandle og delta, men de nordiske tegnspråkene er mer varierte enn de talte nordiske språkene. Tegnspråktolking på eget språk er nødvendig for tegnspråklige når de jobber, studerer eller er i et annet land av andre årsaker. Begrensinger i nasjonale regelverk for tolkebistand i andre nordiske land er opplevd som en barriere for de hørselshemmede. Nasjonale ID-nummer/personnummer er ofte nødvendig for å få velferdstjenester, inkludert bistand med tegnspråk i det landet man oppholder seg i. I forbindelse med flytting fra et nordisk land til et annet vil kravet om nasjonalt personnummer, og saksbehandlingstiden for å få dette, sette tegnspråklige i en sårbar situasjon. Det kan være perioder der den hørselshemmede står uten mulighet til å samhandle med hørende eller delta i samfunnslivet på lik linje med de fleste andre. Denne prosjektrapporten beskriver de grensehindrene som døve tegnspråklige erfarer når de krysser landegrenser i forbindelse med utdanning, arbeid og hverdagsliv. I et åpent arbeids- og utdanningsliv opplever tegnspråkbrukere andre grensehinder enn mange andre som krysser landegrenser i forbindelse med arbeid. Prosjektrapporten kommer med noen anbefalinger for å fjerne de grensehindrene som beskrives.

Lybanon, M. Oceanographic Expert System: Potential for TESS(3) Applications. Fort Belvoir, VA: Defense Technical Information Center, luglio 1992. http://dx.doi.org/10.21236/ada254908.

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Lu, Xingang, e Wei Lu. Analgesia effect of TENS on myofascial pain syndrome. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, dicembre 2021. http://dx.doi.org/10.37766/inplasy2021.12.0090.

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Novotny, Vaclav, Junyung Kim, Terry Morton, Sarah Creasman e Daniel Mikkelson. Validation and Verification of TEDS Facility HYBRID Modeling. Office of Scientific and Technical Information (OSTI), settembre 2023. http://dx.doi.org/10.2172/2299518.

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Solberg, Jason B. MIL-STD-1660 Tests on Tactical Explosive System (TEXS). Fort Belvoir, VA: Defense Technical Information Center, agosto 1990. http://dx.doi.org/10.21236/ada247572.

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Miller, R. J., e C. R. Sampson. Evaluation of Simple Mesoscale Models for Use in TESS. Fort Belvoir, VA: Defense Technical Information Center, novembre 1991. http://dx.doi.org/10.21236/ada247914.

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Solberg, Jason B. MIL-STD-1660 Tests on Tactical Explosive System (TEXS). Fort Belvoir, VA: Defense Technical Information Center, agosto 1990. http://dx.doi.org/10.21236/ada257222.

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