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Littérature scientifique sur le sujet « Thermal Hysteresi »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Thermal Hysteresi"

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Bobenko, Nadezhda, Valeriy Egorushkin et Alexander Ponomarev. « Hysteresis in Heat Capacity of MWCNTs Caused by Interface Behavior ». Nanomaterials 12, no 18 (10 septembre 2022) : 3139. http://dx.doi.org/10.3390/nano12183139.

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The paper is concerned with the study of structural disorder as well as the emergence and causes of heat capacity hysteresis in multiwall carbon nanotubes. The investigation methods are X-ray diffraction analysis, Raman spectroscopy, transmission electron microscopy, and calorimetric tests: thermogravimetric analysis, differential scanning calorimetry, and the thermal relaxation method for heat capacity hysteresis. Multiwall carbon nanotubes are shown to be composed of one or several types of zigzag–armchair domains. The domain structure of nanotube samples is responsible for the generation of uniaxial elastic microstrains and viscoelastic bending strains at domain interfaces. The thermomechanical behavior of interfaces is the chief cause of temperature hysteresis of heat capacity. The number of hystereses corresponds to the number of domain types in the structure, and values of hysteresis are determined by the crystallite size, thermal conductivity, and normal temperature distribution of strain. The found mechanism of heat capacity hysteresis can be helpful in preventing jumps in thermal properties and managing thermal memory in multiwall carbon nanotubes.
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Kutschan, Bernd, Silke Thoms et Maddalena Bayer-Giraldi. « Thermal hysteresis of antifreeze proteins considering Fragilariopsis cylindrus ». Algological Studies 151-152, no 1 (1 septembre 2016) : 69–86. http://dx.doi.org/10.1127/algol_stud/2016/0252.

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Feng, Man, et Delwyn G. Fredlund. « Calibration of thermal conductivity sensors with consideration of hysteresis ». Canadian Geotechnical Journal 40, no 5 (1 octobre 2003) : 1048–55. http://dx.doi.org/10.1139/t03-046.

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A thermal conductivity sensor monitors soil suction by measuring the changes in thermal conductivity of the porous tip. The thermal conductivity of the porous tip is a direct function of its water content. It has long been recognized that the suction versus water content relationship of a porous material exhibits hysteresis of various magnitudes between wetting and drying processes. The sensor output may correspond to various suction values of the sensor porous tip, depending on the wetting or drying state of the porous tip. The current calibration procedure, however, represents only one of the drying processes of the sensor porous tip. A laboratory testing program was carried out to better understand the hysteretic properties of the sensor output voltage versus the suction and to further improve the calibration procedure. The output of the sensor was monitored as the sensor porous tip was subjected to various drying and wetting processes. The test results indicate an error of 30%–70% for suctions higher than 100 kPa if the hysteretic effects of the porous tip are not considered in data interpretation. Based on the laboratory testing results, a revised calibration procedure was proposed that takes into consideration the capillary hysteretic effects.Key words: thermal conductivity sensor, calibration, matric suction, capillary hysteresis.
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Hamid, Youssef, David A. Hutt, David C. Whalley et Russell Craddock. « Relative Contributions of Packaging Elements to the Thermal Hysteresis of a MEMS Pressure Sensor ». Sensors 20, no 6 (19 mars 2020) : 1727. http://dx.doi.org/10.3390/s20061727.

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Piezoresistive silicon pressure sensor samples were thermally cycled after being consecutively packaged to three different levels. These started with the absolute minimum to allow measurement of the output and with each subsequent level incorporating additional packaging elements within the build. Fitting the data to a mathematical function was necessary both to correct for any testing uncertainties within the pressure and temperature controllers, and to enable the identification and quantification of any hysteresis. Without being subjected to any previous thermal preconditioning, the sensors were characterized over three different temperature ranges and for multiple cycles, in order to determine the relative contributions of each packaging level toward thermal hysteresis. After reaching a stabilised hysteretic behaviour, 88.5% of the thermal hysteresis was determined to be related to the bond pads and wire bonds, which is likely to be due to the large thermal mismatch between the silicon and bond pad metallisation. The fluid-fill and isolation membrane contributed just 7.2% of the total hysteresis and the remaining 4.3% was related to the adhesive used for attachment of the sensing element to the housing. This novel sequential packaging evaluation methodology is independent of sensor design and is useful in identifying those packaging elements contributing the most to hysteresis.
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Barrett, John. « Thermal hysteresis proteins ». International Journal of Biochemistry & ; Cell Biology 33, no 2 (février 2001) : 105–17. http://dx.doi.org/10.1016/s1357-2725(00)00083-2.

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Boukheddaden, Kamel, Houcem Fourati, Yogendra Singh et Guillaume Chastanet. « Evidence of Photo-Thermal Effects on the First-Order Thermo-Induced Spin Transition of [{Fe(NCSe)(py)2}2(m-bpypz)] Spin-Crossover Material ». Magnetochemistry 5, no 2 (1 avril 2019) : 21. http://dx.doi.org/10.3390/magnetochemistry5020021.

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We have investigated by means of optical microscopy and magnetic measurements the first-order thermal spin transition of the [{Fe(NCSe)(py)2}2(m-bpypz)] spin-crossover compound under various shining intensities, far from the light-induced spin-state trapping region. We found evidence of photo-heating effects on the thermally-induced hysteretic response of this spin-crossover material, thus causing the shift of the thermal hysteresis to lower temperature regions. The experimental results are discussed in terms of the apparent crystal temperature and are analyzed theoretically using two evolution equations of motion, written on the high-spin (HS) fraction and heat balance between the crystal and the thermal bath. A very good qualitative agreement was found between experiment and theory in the stationary regime, explaining the experimental observations well and identifying the key factors governing these photo-thermal effects.
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Lu, Sheng, Xing Yin Zhu, Bin Liu et Yun Peng Wang. « Effects of Workpiece Size on Temperature Distribution During FSW of AZ31 Magnesium Alloy ». Materials Science Forum 850 (mars 2016) : 734–41. http://dx.doi.org/10.4028/www.scientific.net/msf.850.734.

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This study aims to experimentally explore the effects of varying workpiece sizes on thermal histories and temperature distributions during FSW processes of AZ31 magnesium alloy. Similar layouts of thermocouples were designed to measure thermal histories of feature points at different locations along the welding direction. A tendency of peak temperature presented that it kept climbing gradually for a distance about 60mm, then approached to change smoothly. A time hysteresis has been also found that the time of the measured temperature reaching the peak lagged behind the time of the tool staying or arriving at these feature points. The longest hysteretic time was about 6s, as the welding process proceeded, it shortened slowly. The longer the length of the welding direction was, the more obvious the tendency was, but the hysteresis, on the contrary. The intense impact of the heat accumulation was embodied in terms of the time staying above the recrystallization temperature. According to these results, it is inferred that the welding process reaches a real stable stage after the tool traversed a 60mm’s distance.
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Schmahl, Wolfgang W. « Athermal transformation behaviour and thermal hysteresis at the SiO2-α/ß-cristobalite phase transition ». European Journal of Mineralogy 5, no 2 (27 avril 1993) : 377–80. http://dx.doi.org/10.1127/ejm/5/2/0377.

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GU, WEN-XIAO, MENG-LIAN ZHAO, XIAO-BO WU, MINGYANG CHEN et QING LIU. « A HIGH-PRECISION ULTRA-LOW-POWER HYSTERETIC VOLTAGE DETECTOR USING CURRENT-BASED COMPARISON ». Journal of Circuits, Systems and Computers 22, no 09 (octobre 2013) : 1340005. http://dx.doi.org/10.1142/s0218126613400057.

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This paper presented a high-precision, ultra-low-power hysteretic voltage detector (HVD) using current comparison to detect voltage default crossing moments for energy-harvesting systems (EHS) in wireless sensor network (WSN) applications. The HVD mainly consists of four parts: a specially designed voltage-to-current converter (VCC) with thermal stability improvement, a comparison core to make current-based comparison, a current pre-amplifier to improve its transient performance and a Schmitt inverter to provide the hysteresis characteristic. The prototype of this HVD has been implemented in SMIC 0.18 μm CMOS process and occupies 0.036 mm2 area without pads. The hysteresis window is about 120 mV wide. The temperature coefficient (TC) is about -170.2 ppm°C. The average variation to different process corners can be reduced to 1.4% by MOSFET and resistor trimming. The total power consumption is only 701.5 nW when VDD is around 1.8 V.
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Urrutia, Maria E., John G. Duman et Charles A. Knight. « Plant thermal hysteresis proteins ». Biochimica et Biophysica Acta (BBA) - Protein Structure and Molecular Enzymology 1121, no 1-2 (mai 1992) : 199–206. http://dx.doi.org/10.1016/0167-4838(92)90355-h.

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Thèses sur le sujet "Thermal Hysteresi"

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MANGIAGALLI, MARCO. « Structural and functional analyses of an ice-binding protein from an Antarctic bacterium ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2019. http://hdl.handle.net/10281/241269.

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Una proteina in grado di legare i cristalli di ghiaccio è definita proteina legante il ghiaccio o IBP acronimo dall’inglese ice-binding protein. Le IBP grazie alla loro capacità di abbassare il punto di congelamento dell’acqua, aumentando il gap di isteresi termica (TH). Questo intervallo è definito come la differenza tra il punto di fusione e di congelamento dell’acqua. La seconda attività delle IBP è l’inibizione della ricristallizzazione del ghiaccio (ice recrystallization inhibition, IRI). Infatti, queste proteine stabilizzano i piccoli cristalli di ghiaccio impedendo la formazione di cristalli di ghiaccio di grosse dimensioni che sono dannosi per le cellule. Le IBP sono state identificate in numerosi organismi tra cui pesci, insetti, batteri, alghe e lieviti. Queste proteine rappresentano un esempio di evoluzione convergente, infatti tutte le IBP condividono lo stesso meccanismo di legame con il ghiaccio nonostante una sorprendente diversità strutturale e funzionale. Questo lavoro di tesi è focalizzato sulla caratterizzazione funzionale e strutturale di EfcIBP, una IBP batterica identificata da analisi di metagenomica effettuate sul ciliato Antartico Euplotes focardii e sul consorzio batterico ad esso associato. La struttura 3D di EfcIBP è stata risolta mediante cristallografia ai raggi X e consiste in un β-solenoide con un α-elica parallela all’asse principale della proteina. L’analisi strutturale ha permesso di identificare tre diverse facce del solenoide denominate A, B e C. Simulazioni di docking suggeriscono che EfcIBP è in grado di legare i cristalli di ghiaccio tramite le facce B e C del solenoide. Questa ipotesi è stata verificata attraverso la progettazione razionale di 6 varianti che sono state prodotte e saggiate per la loro attività. In generale, questi risultati indicano che EfcIBP è in grado di legare i cristalli di ghiaccio attraverso le facce B e C del solenoide. Questa peculiarità strutturale si riflette in un’insolita combinazione di attività di IRI e TH. Infatti, EfcIBP presenta una notevole attività di IRI in un intervallo di concentrazione nanomolare e una attività di isteresi termica di 0.53°C alla concentrazione di 50 μM che la rende una IBP moderata. All’interno del gap di TH, i cristalli di ghiaccio presentano una forma esagonale, mentre a temperature al di sotto della temperatura di congelamento presentano una forma a “Saturno". La proteina chimerica formata dalla “green fluorescent protein” e da EfcIBP è stata utilizzata per determinare a quali piani del cristallo di ghiaccio la proteina è in grado di legarsi e con quale cinetica. I dati sperimentali suggeriscono che le peculiarità funzionali di EfcIBP sono dovute alla sua capacità di legare velocemente i piani basali e piramidali del cristallo di ghiaccio. Questi dati, insieme alla presenza di una sequenza segnale per la secrezione, suggeriscono che EfcIBP è secreta e svolge la funzione di mantenere liquido l’ambiente circostante aumentando lo spazio vitale. In conclusione, EfcIBP è un nuovo tipo di IBP con proprietà insolite di legame al ghiaccio e di attività di IRI. Questo studio ha contribuito ad identificare una nuova classe di IBP moderate che potrebbero essere sfruttate come crioprotettori in diversi settori come la criobiologia e quello alimentare.
Ice-binding proteins (IBPs) are characterized by the ability to control the growth of ice crystals. IBPs are active in increasing thermal hysteresis (TH) gap as they decrease the freezing point of water. On the other hand, IBPs can inhibit ice recrystallization (IRI) and stabilize small ice crystals at the expense of the harmful, large ones. IBPs have been identified in several organisms including higher Eukaryotes and microorganisms such as bacteria, yeasts and algae. Although IBPs share the ability to bind ice crystals, proteins from different sources present different 3D structures, from α-helix to β-solenoid proteins. This thesis is focused on the structural and functional characterization of EfcIBP, a bacterial IBP identified by metagenomic analysis of the Antarctic ciliate Euplotes focardii and the associated consortium of non-cultivable bacteria. The 3D structure of EfcIBP, solved by X-ray crystallography, consists in a β-solenoid with an α-helix aligned along the axis of the β-helix. It is possible to distinguish three different faces: A, B and C. Docking simulations suggest that B and C faces are involved in ice binding. This hypothesis was tested by the rational design of six variants that were produced and assayed for their activity. Overall, these experiments indicate that both solenoid faces contribute to the activity of EfcIBP. EfcIBP displays remarkable IRI activity at nanomolar concentration and a TH activity of 0.53°C at the concentration of 50 μM. The atypical combination between these two activities could stem from the ability of this protein to bind ice crystals through two faces of the solenoid. In the presence of EfcIBP, ice crystals show a hexagonal trapezohedron shape within the TH gap, and a unique “Saturn-shape” below the freezing point. A chimeric protein consisting of the fusion between EfcIBP and the green fluorescent protein was used to deeper investigate on this aspects by analyses of fluorescence ice plane affinity and binding kinetics. Overall, experimental data suggest that the EfcIBP unique pattern of ice growth and burst are due to its high rate of binding at the basal and the pyramidal near-basal planes of ice crystals. These data, together with the signal sequence for the secretion, suggest that EfcIBP is secreted in local environment where it becomes active in increasing the habitable space. In conclusion, EfcIBP is a new type of IBP with unusual properties of ice shaping and IRI activity. This study opens new scenarios in the field of IBPs by contributing to identify a new class of moderate IBPs potentially exploitable as cryoprotectants in several fields, such as cryobiology and food science.
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Scheck, Christopher G. « Thermal Hysteresis loss in gas springs ». Ohio University / OhioLINK, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1182870415.

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Can, Ozge. « NOVEL ANTIFREEZE PROTEIN CONSTRUCTS FOR IMPROVED ACTIVITY ». Cleveland State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=csu1229703788.

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Celik, Yeliz. « Experimental Investigation of the Interactions of Hyperactive Antifreeze Proteins with Ice Crystals ». Ohio University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1268166115.

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Suleimanov, Iurii. « Nano-objets et nano-composites à transition de spin basés sur des complexes du fer(II) avec des ligands 1,2,4-triazoles ». Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30017.

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L'échelle moléculaire est de plus en plus considérée comme une solution alternative pour la miniaturisation des composants électroniques en vue de la construction de dispositifs fonctionnels. L'approche actuelle "top-down" basée sur la technologie du silicium force les chimistes du solide, les physiciens et les électroniciens à manipuler progressivement des quantités de matière de plus en plus faibles. Dans ce domaine, les dispositifs moléculaires offrent des perspectives remarquables avec des niveaux de sensibilité et de sélectivité qui ne peuvent pas être atteints avec les matériaux à semi-conducteurs conventionnels. Dans ce contexte, les complexes ou polymères de coordination représentent une classe importante de composés possédant des propriétés de commutation magnétiques, optiques et électrochimiques intéressantes. En particulier, les composés à transition de spin (transition intra-métallique de l'état haut spin vers l'état bas spin) des métaux de transition sont bien adaptés à cette stratégie car ils peuvent être le siège d'une transition réversible du premier ordre avec hystérésis sous l'effet d'une perturbation extérieure (température, pression ou éclairement) impliquant des modifications magnétique, optique et structurale. Dans ces travaux de thèse, des matériaux susceptibles de présenter des propriétés de bistabilité avec hystérésis autour de la température ambiante sont présentés et discutés. Un des objectifs est d'étudier l'évolution de leurs propriétés en fonction de la taille et de valoriser ces matériaux. Pour cela, ces composés ont été nano-structurés. Ainsi nous avons élaboré des nanoparticules à base de composé à transition de spin par différentes voies de synthèse et réalisé des films minces et des nanostructures de ces matériaux par des méthodes de lithographie douce et de lithographie électronique. Pour caractériser les propriétés de ces nouveaux objets, nous nous sommes orienté vers l'utilisation de nouvelles techniques de détection optiques et en particulier vers des techniques qui permettent la mesure de la variation du changement d'indice optique de ces matériaux, à savoir, des mesures de la variation des plasmons de surface lorsque des couches minces bistables de ces composés sont mises au contact de surface d'or et des mesures de variation de l'efficacité de diffraction à partir de réseaux de motifs de tailles micro- et nanométriques. Par ailleurs, une méthode basée sur la variation de l'intensité de fluorescence d'un fluorophore sélectionné et intégré au sein de composé mixte (composé à transition de spin - fluorophore) a également été développée. L'ensemble de ces méthodes concourt à pouvoir détecter un objet unique de taille nanométrique
The thesis is devoted to the preparation of new nanoobjects and nanocomposites of spin crossover complexes [Fe(Htrz)2(trz)](BF4) and [Fe(NH2-trz)3](NO3)2 (where Htrz - 1,2,4-triazole, trz - 1,2,4-trazolato, NH2-trz - 4-amino-1,2,4-triazole) and investigation their properties. Nanoobjects of mixed-ligand complexes with different ratio of 4-amino-1,2,4-triazole to 1,2,4-triazole were synthesized in reverse emulsions. It was shown that the increasing of the of 4-amino-1,2,4-triazole quantity leads to the increasing of nanoparticles anisotropy while spin crossover temperatures decrease. Double-step spin transition was observed at 20% mol of 4-amino-1,2,4-triazole, while at concentrations over 50% mol. spin crossover properties of [Fe(Htrz)2(trz)](BF4) completely disappear. Investigations of their morpholgy, size and spin transition characteristics as well as investigations of mechanisms of the fluorescent properties change under the spin switching process are shown. We consider obtaining nanoobjects of mixed-ligand complexes of iron (II) based on 1,2,4-triazole and 4-amino-1,2,4-triazole. The ligands ratio influences the morphology, size and characteristics of the spin transition of nanoobjects obtained. New modification of the complex [Fe(NH2-trz)3](NO3)2 in the form of nanoobjects was obtained using ligand excess. High transition temperature of this form was evidenced by various methods of analysis. This form was found to be isostructural with a resolved structure of [Fe(NH2-trz)3](NO3)2 · 2H2O. Series of nanocomposites with plasmonic and luminescent properties were prepares. For the core-shell composite with gold nanoparticles higher efficiency of the spin state switching due to the photothermal effect was demonstrated in comparison to the control sample. Fluorescent spin crossover composites with quantum dots, organic luminophors and terbium complexes were described. For all these composites the luminescence intensity variation as a function of temperature have been found. The mechanisms responsable of the luminescence intensity variation at two spin state are discussed. These mechanisms include resonant energy transfer, mechanical strain and photon reabsorption. High photostability fort he terbium - spin crossover composite is demonstrated comparing to previously obtained similar spin crossover luminescetnt composites. An example of a practical application of obtained composites for manufacturing fluorescent thermosensitive paper is shown
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Gelaye, Ababu A. « UPSCALING OF A THERMAL EVOLUTION EXPERIMENT ON SHREDDED-TIRE MONOFILLS ». University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1512762530668535.

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Petrášová, Anna. « Počítačové modelování teplotní hystereze při změně skupenství ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-445463.

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This thesis deals with computer modeling of temperature hysteresis during phase change, namely complete and partial phase change. There is performed a review of methods for modeling temperature hysteresis based on the enthalpy method and the effective heat capacity method. In the case of complete phase change, there are several methods that use the effective heat capacity method, as well as the heat source method, which, on the contrary, is a certain analogy of the enthalpy method. The following are works dealing with modelling of partial phase change, the most interesting of which is due to the validation method of static hysteresis and the method designed by Bony and Citherlet. The second part of this thesis deals with the hysteresis behavior of the material with phase change, which is organic paraffin RT 27. The input data obtained by differential scanning calorimetry was converted to the dependence of the enthalpy on temperature. These curves was represented by piecewise linear function. In the case of partial phase transformations, a modeling method based on the methods proposed by Bonym and Citherlet was designed. An one-dimensional model enabling thermal simulation of the material was implemented in the MATLAB software environment. The results obtained with this simulation are finally compared with a model that does not consider thermal hysteresis.
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Abeysekara, A. U., S. Archambault, A. Archer, W. Benbow, R. Bird, M. Buchovecky, J. H. Buckley et al. « A SEARCH FOR SPECTRAL HYSTERESIS AND ENERGY-DEPENDENT TIME LAGS FROM X-RAY AND TeV GAMMA-RAY OBSERVATIONS OF Mrk 421 ». IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/622634.

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Blazars are variable emitters across all wavelengths over a wide range of timescales, from months down to minutes. It is therefore essential to observe blazars simultaneously at different wavelengths, especially in the X-ray and gamma-ray bands, where the broadband spectral energy distributions usually peak. In this work, we report on three " target-of-opportunity" observations of Mrk 421, one of the brightest TeV blazars, triggered by a strong flaring event at TeV energies in 2014. These observations feature long, continuous, and simultaneous exposures with XMM-Newton (covering the X-ray and optical/ultraviolet bands) and VERITAS (covering the TeV gamma-ray band), along with contemporaneous observations from other gamma-ray facilities (MAGIC and Fermi-Large Area Telescope) and a number of radio and optical facilities. Although neither rapid flares nor significant X-ray/TeV correlation are detected, these observations reveal subtle changes in the X-ray spectrum of the source over the course of a few days. We search the simultaneous X-ray and TeV data for spectral hysteresis patterns and time delays, which could provide insight into the emission mechanisms and the source properties (e. g., the radius of the emitting region, the strength of the magnetic field, and related timescales). The observed broadband spectra are consistent with a one-zone synchrotron self-Compton model. We find that the power spectral density distribution at greater than or similar to 4 x 10(-4) Hz from the X-ray data can be described by a power-law model with an index value between 1.2 and 1.8, and do not find evidence for a steepening of the power spectral index (often associated with a characteristic length scale) compared to the previously reported values at lower frequencies.
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Han, Mangui. « Critical Behavior of Thermal Expansion and Magnetostriction in the Vicinity of the First order transition at the Curie Point of Gd5(SixGe1-x)4 ». Ames, Iowa : Oak Ridge, Tenn. : Ames Laboratory ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2004. http://www.osti.gov/servlets/purl/837267-32IBIb/webviewable/.

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Thesis (Ph.D.); Submitted to Iowa State Univ., Ames, IA (US); 19 Dec 2004.
Published through the Information Bridge: DOE Scientific and Technical Information. "IS-T 2309" Mangui Han. US Department of Energy 12/19/2004. Report is also available in paper and microfiche from NTIS.
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Lhermerout, Romain. « Mouillage de surfaces désordonnées à l'échelle nanométrique ». Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEE041/document.

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Durant cette thèse, nous avons d'abord développé un dispositif expérimental permettant de mesurer la dynamique de l'angle de contact avec une précision record de 0,01° sur 7 décades de vitesses de la ligne triple, gamme jamais atteinte auparavant. Pour la première fois, la résolution numérique des équations de lubrification a permis de déduire l'angle de contact à l'échelle microscopique de ces mesures macroscopiques, découplant donc le problème hydrodynamique multi-échelles de la physique de la ligne de contact à petite échelle. Avec ces outils, nous avons montré qu'une pseudo-brosse - une couche nanométrique de polymères - peut complètement piloter la dynamique, en produisant des hystérésis les plus faibles jamais mesurées (<0,07° !) et des surdissipations massives provenant de la nature visco-élastique de la couche. Cette étude ouvre la voie à la nano-rhéologie, permettant de sonder la dynamique extrêmement rapide (~100 ns) de polymères confinés à l'échelle nanométrique. Grâce à un travail collaboratif fructueux, nous avons ensuite développé un modèle permettant de décrire quantitativement et de façon unifiée la dissipation hydrodynamique, l'hystérésis et l'activation thermique. Enfin, beaucoup d'efforts ont été fournis pour la fabrication de surfaces aux défauts nanométriques contrôlés en taille, forme et concentration. La dynamique s'est révélée insensible à cette échelle de désordre, la présence des défauts n'affectant que l'hystérésis. Ces résultats ont été interprétés semi-quantitativement avec des lois d'échelle, et la caractérisation complète des défauts devrait permettre à terme de développer des modèles plus quantitatifs
During this thesis, we first developed an experimental set-up to measure contact angle dynamics with a record precision of 0.01° over 7 decades of velocity of the triple line, a range never before attained. For the first time, numerically solving the lubrication equations has allowed us to deduce the contact angle at the microscopic scale from these macroscopic measurements, and thus enabled the multi-scale hydrodynamic problem to be disentangled from the physics of the contact line at small scales. With these tools we have shown that the dynamics can be completely piloted by a pseudo-brush -a nanometric layer of polymers-, producing the lowest ever reported hysteresis (<0.07°!) and giving rise to a huge source of dissipation originating from the viscoelasticity of the coating. This study points the way towards nano-rheology, to probe extremely fast dynamics (~100 ns) of polymers confined at the nano-scale. Thanks to a fruitful collaborative work, we then developed a model that provides a single quantitative framework to account for hydrodynamic dissipation, hysteresis and thermal activation. Finally, a great deal of effort has been made to produce nano-defects whose size, shape and density are controlled. The dynamics appears to be insensitive to this scale of disorder, and the presence of defects is observed to only modify the hysteresis. These results have been interpreted semi-quantitatively with scaling laws, and we expect that the complete characterization of the defects should eventually allow the development of more quantitative models
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Livres sur le sujet "Thermal Hysteresi"

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Clarke, Andrew. Freezing. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780199551668.003.0006.

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Freezing is a widespread ecological challenge, affecting organisms in over half the terrestrial environment as well as both polar seas. With very few exceptions, if a cell freezes internally, it dies. Polar teleost fish in shallow waters avoid freezing by synthesising a range of protein or glycoprotein antifreezes. Terrestrial organisms are faced with a far greater thermal challenge, and exhibit a more complex array of responses. Unicellular organisms survive freezing temperatures by preventing ice nucleating within the cytosol, and tolerating the cellular dehydration and membrane disruption that follows from ice forming in the external environment. Multicellular organisms survive freezing temperatures by manipulating the composition of the extracellular body fluids. Terrestrial organisms may freeze at high subzero temperatures, often promoted by ice nucleating proteins, and small molecular mass cryoprotectants (often sugars and polyols) moderate the osmotic stress on cells. A range of chaperone proteins (dehydrins, LEA proteins) help maintain the integrity of membranes and macromolecules. Thermal hysteresis (antifreeze) proteins prevent damaging recrystallisation of ice. In some cases arthropods and higher plants prevent freezing in their extracellular fluids and survive by supercooling. Vitrification of extracellular water, or of the cell cytosol, may be a more widespread response to very cold temperatures than recognised to date.
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Manson, S. S., et G. R. Halford. Fatigue and Durability of Metals at High Temperatures. ASM International, 2009. http://dx.doi.org/10.31399/asm.tb.fdmht.9781627083430.

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Fatigue and Durability of Metals at High Temperatures is a repository of knowledge, experience, and insights on high-temperature fatigue and its effect on component lifetime and failure. The first few chapters provide readers with an intuitive understanding of creep and creep-fatigue and how they progress based on time, temperature, and stress. In subsequent chapters, the authors present several fatigue life prediction techniques, comparing them to each other and to experimental test results. The authors focus on a method called strain-range partitioning that breaks stress-strain hysteresis loops into simpler components, the effects of which can be analyzed more easily. Through detailed examples, they show how strain-range partitioning can account for creep-fatigue interactions, multiaxial stresses and strains, temperature gradients, metallurgical and microstructural changes, thermal fatigue, and damage mitigation or “healing” due to sequential loading. The method is also used to examine the cyclic deformation characteristics of various steels and alloys and the obstacles to achieving high-temperature structural durability with fiber-reinforced metal-matrix composites. For information on the print version, ISBN 978-0-87170-718-5, follow this link.
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Chapitres de livres sur le sujet "Thermal Hysteresi"

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Kristiansen, Erlend. « Thermal Hysteresis ». Dans Antifreeze Proteins Volume 2, 131–58. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-41948-6_6.

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Unruh, H. G., et A. Levstik. « Thermal Hysteresis, Solitons and Domain Walls ». Dans NATO ASI Series, 163–76. New York, NY : Springer US, 1987. http://dx.doi.org/10.1007/978-1-4757-0184-5_15.

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Rassili, A., et M. Ausloos. « Critical Behavior of the Thermal Conductivity near a Magnetic Phase Transition ». Dans Magnetic Hysteresis in Novel Magnetic Materials, 187–93. Dordrecht : Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5478-9_18.

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Kühn, Jan, Andreas Bartel et Piotr Putek. « A Thermal Extension of Tellinen’s Scalar Hysteresis Model ». Dans Scientific Computing in Electrical Engineering, 55–63. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44101-2_6.

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Müller, I. « Some Remarks on Thermo-Mechanical Hysteresis ». Dans Advances in Continuum Mechanics, 428–40. Berlin, Heidelberg : Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-48890-0_34.

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Bonney, G. E. « Thermal Hysteresis at 4 K with a GM Cryocooler ». Dans Cryocoolers 12, 411–19. Boston, MA : Springer US, 2003. http://dx.doi.org/10.1007/0-306-47919-2_54.

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Roshko, R. M., P. D. Mitchler et E. Dan Dahlberg. « The Effect of Thermally Induced Relaxation on the Remanent Magnetization in a Moving Preisach Model ». Dans Magnetic Hysteresis in Novel Magnetic Materials, 147–57. Dordrecht : Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5478-9_13.

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Gusev, Vitalyi, et Vincent Tournat. « Thermally Induced Rate-Dependence of Hysteresis in Nonclassical Nonlinear Acoustics ». Dans Universality of Nonclassical Nonlinearity, 337–48. New York, NY : Springer New York, 2006. http://dx.doi.org/10.1007/978-0-387-35851-2_21.

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Tan, Yuqing, Ji Dang, Akira Igarashi, Takehiko Himeno et Yuki Hamada. « A Thermo-Mechanical Coupled Model of Hysteresis Behavior of HDR Bearings ». Dans Lecture Notes in Civil Engineering, 307–19. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-93236-7_27.

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Usui, Kaoru, Shinichi Ichimura, Kazuo Nozaki, Manabu Suzuki, Kazuya Oguri et Yoshitake Nishi. « Influence of Thermal Hysteresis on Tc mid — (about 115 K) of High-Tc Bi-System ». Dans Advances in Superconductivity VI, 671–73. Tokyo : Springer Japan, 1994. http://dx.doi.org/10.1007/978-4-431-68266-0_148.

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Actes de conférences sur le sujet "Thermal Hysteresi"

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Clemente-Arenas, Mark, Julio Urbina et Akhlesh Lakhtakia. « Metasurfaces with thermal hysteresis ». Dans 2018 International Conference on Electromagnetics in Advanced Applications (ICEAA). IEEE, 2018. http://dx.doi.org/10.1109/iceaa.2018.8520495.

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Zhang, Jun, Emmanuelle Merced, Nelson Sepúlveda et Xiaobo Tan. « Modeling of Non-Monotonic Hysteresis Behavior in VO2-Coated Microactuators ». Dans ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-7940.

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Vanadium dioxide (VO2) undergoes a thermally induced solid-to-solid phase transition. A VO2-coated silicon cantilever demonstrates large change in its bending curvature across its phase transition. Due to phase transition and thermal expansion effects, the curvature – temperature hysteresis in VO2 actuators comes with a non-monotonic hysteretic behavior, introducing new challenges in its modeling. Motivated by the underlying physics, in this paper we present a novel model that combines a monotonic Preisach hysteresis operator with a linear operator. A constrained least square scheme is proposed to estimate the model parameters. For comparison purposes, we also consider a Preisach operator with a signed weighting function, and a hybrid model consisting of a monotonic Preisach operator for the curvature within the transition and linear operators outside the transition. Experimental results confirm the effectiveness of the proposed model.
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Bauerbach, Kai, Michael Vormwald et Ju¨rgen Rudolph. « Fatigue Assessment of Nuclear Power Plant Components Subjected to Thermal Cyclic Loading ». Dans ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77450.

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Thermal loading conditions of nuclear power plant components cause local stress-strain hystereses. For the fatigue life prediction of nuclear power plant components under thermal cyclic and structural loading a new method based on the local strain approach is to be presented. This method involves finite-element simulations as well as the experience gathered from lifetime assessment methods based on short crack models. The local stresses and strains are obtained from coupled-field FE-analyses. The calculation of the hysteresis-loops relies on appropriate material models and experimentally verified temperature-dependent material parameters in order to describe the elasto-plastic behavior of the material as realistically as necessary. Due to the temperature dependence of the material parameters the resulting hysteresis loops are of non-conventional shapes and similar to those observed under multiaxial nonproportional structural loading. Hence, fatigue methodologies developed for non-proportional loading conditions during the past years bear good prospects for successful application under non-isothermal loading conditions.
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Pieniazek, Jacek, et Piotr Ciecinski. « Thermal hysteresis in inertial sensors ». Dans 2020 IEEE 7th International Workshop on Metrology for AeroSpace (MetroAeroSpace). IEEE, 2020. http://dx.doi.org/10.1109/metroaerospace48742.2020.9160243.

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Dantas, A. L., R. E. Camley et A. S. Carrico. « Thermal hysteresis of thin Dy films ». Dans INTERMAG 2006 - IEEE International Magnetics Conference. IEEE, 2006. http://dx.doi.org/10.1109/intmag.2006.375668.

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Tan, Yuqing, Akira Igarashi, Ji Dang, Takehiko Himeno et Yuki Hamada. « A Thermo-mechanical Coupled Model of Hysteresis Behavior of HDR Bearings ». Dans IABSE Symposium, Prague 2022 : Challenges for Existing and Oncoming Structures. Zurich, Switzerland : International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/prague.2022.1574.

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<p>The hysteretic behavior of High Damping Rubber (HDR) bearings is significantly affected by inner temperature and hysteresis self-heating interactions, the stiffness of HDR is increased at lower inner temperature. To introduce the HDR bearings in cold earthquake prone regions, a temperature- dependent hysteresis model is of great concern. In this study, a thermo-mechanical coupled model is proposed for HDR bearings. The model parameters are identified from quasi-static loading tests at ambient temperatures of 23°C, 0°C and −20°C, and the validity of the model is discussed based on a comparison of the numerical seismic response of a bridge model using HDR bearings with the hybrid simulation result at 23°C, 0°C and −20°C. An acceptable agreement can be observed between the model and test result at the 23°C and 0°C under seismic loading conditions.</p>
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Wong, Voon Hon, John Parry et Gabor Farkas. « Effects of Auto-calibration Hysteresis ». Dans 2021 27th International Workshop on Thermal Investigations of ICs and Systems (THERMINIC). IEEE, 2021. http://dx.doi.org/10.1109/therminic52472.2021.9626480.

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Chiou, J. Albert, et Steven Chen. « Thermal Hysteresis Analysis of MEMS Pressure Sensors ». Dans ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59184.

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Thermal hysteresis reduction is usually a difficult task to tackle for micromachined pressure sensors especially when shrinking the piezoresistive transducer (PRT) sensing element. Since thermal hysteresis involves the entire thermal cycling history and complicated material properties varied with temperatures, viscoplastic deformation makes the problem very complicated when dealing with high-precision sensor signals. The approach to simplify and quickly resolve the thermal hysteresis problem is the key methodology proposed by this paper. The objective of this project is to optimize the metal layout design on the sensing element and lower down the thermal hysteresis. It is time consuming and cost ineffective to rely purely on the hardware tests to solve the thermal hysteresis problem. ANSYS is used to predict the shear stress at the transducer location and the phenomenological theory of silicon piezoresistance is used to calculate the output voltage and thermal hysteresis. The element-death-and-birth technique is used to simulate the bonding process at various temperature levels for the sensing element packaging. With the aid of the finite element analysis (FEA) tool, the PRT sensing element design was quickly optimized and product development cycle time was reduced.
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Chen, Jian-Zhang. « Thermally Actuated Droplet Motion on Chemically Homogeneous, Striated, and Defected Surfaces ». Dans 2008 Second International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2008. http://dx.doi.org/10.1115/micronano2008-70096.

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Experiments have demonstrated thermocapillary actuation on uniformly grafted partial-wettable surfaces. Droplet mobilization only occurs above a threshold thermal gradient or threshold droplet radius [1]. We characterized the motion instead in terms of a threshold depinning force, which successfully describes all the liquids tested. Above the depinning transition, the droplet speed, which is controlled by thermocapillary, capillary and viscous forces, increases monotonically with this reduced force parameterization. These results agree well to numerical predictions of a generalized Ford and Nadim model by using two fitting parameters, the slip coefficient and the magnitude of contact angle hysteresis [2–3]. In this follow-up study, we developed a doubly grafted surface, on which alkyltrichlorosilane coated stripes are surrounded by a more hydrophobic coating, perfluoroctyl-trichlorosilane. The quality of alkyltrichlorosilane coated stripes was still good for the thermocapillary droplet actuation, in which droplets were driven on the alkyltrichlorosilane surface and confined by the perfluoroctyl-trichlorosilane. The experimental results are also well described by a derived approximate three-dimensional model equation, which resembles the parameterization. The droplets are driven by thermocapillary force and retarded by contact angle hysteretic force, represented as contact angle hysteresis. This contact angle hysteresis is caused by chemical heterogeneity, surface roughness etc [4]. In the last part of this presentation, we will also present the thermocapillary droplet motion on a designed defected surface, which shows a tiny defect can severely hinge the droplet.
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Belghith, Ali, H. Beji et F. Oueslati. « HYSTERESYS ASPECT OF CONVECTION IN POROUS MEDIA WITH CROSS FLUX BOUNDARY CONDITIONS ». Dans Thermal Sciences 2000. Proceedings of the International Thermal Science Seminar Bled. Connecticut : Begellhouse, 2000. http://dx.doi.org/10.1615/ichmt.2000.thersieprocvol2thersieprocvol1.220.

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Rapports d'organisations sur le sujet "Thermal Hysteresi"

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Asenath-Smith, Emily, Emily Jeng, Emma Ambrogi, Garrett Hoch et Jason Olivier. Investigations into the ice crystallization and freezing properties of the antifreeze protein ApAFP752. Engineer Research and Development Center (U.S.), septembre 2022. http://dx.doi.org/10.21079/11681/45620.

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Antifreeze proteins (AFPs) allow biological organisms, including insects, fish, and plants, to survive in freezing temperatures. While in solution, AFPs impart cryoprotection by creating a thermal hysteresis (TH), imparting ice recrystallization inhibition (IRI), and providing dynamic ice shaping (DIS). To leverage these ice-modulating effects of AFPs in other scenarios, a range of icing assays were performed with AFPs to investigate how AFPs interact with ice formation when tethered to a surface. In this work, we studied ApAFP752, an AFP from the beetle Anatolica polita, and first investigated whether removing the fusion protein attached during protein expression would result in a difference in freezing behavior. We performed optical microscopy to examine ice-crystal shape, micro-structure, and the recrystallization behavior of frozen droplets of AFP solutions. We developed a surface chemistry approach to tether these proteins to glass surfaces and conducted droplet-freezing experiments to probe the interactions of these proteins with ice formed on those surfaces. In solution, ApAFP752 did not show any DIS or TH, but it did show IRI capabilities. In surface studies, the freezing of AFP droplets on clean glass surfaces showed no dependence on concentration, and the results from freezing water droplets on AFP-decorated surfaces were inconclusive.
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