Gotowe bibliografie tematyczne / Thermal Arrest Memory Effect

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Gotowa bibliografia na temat „Thermal Arrest Memory Effect”

Autor: Grafiati
Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Thermal Arrest Memory Effect"

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Madangopal, K., S. Banerjee, and S. Lele. "Thermal arrest memory effect." Acta Metallurgica et Materialia 42, no. 6 (1994): 1875–85. http://dx.doi.org/10.1016/0956-7151(94)90012-4.

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Rudajevova, A. "Thermal Arrest Memory Effect in Ni-Mn-Ga Alloys." Advances in Materials Science and Engineering 2008 (2008): 1–5. http://dx.doi.org/10.1155/2008/659145.

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Dilatation characteristics were measured to investigate the thermal arrest memory effect inNi53.6Mn27.1Ga19.3andNi54.2Mn29.4Ga16.4alloys. Interruption of the martensite-austenite phase transformation is connected with the reduction of the sample length after thermal cycle. If a total phase transformation took place in the complete thermal cycle following the interruption, then the sample length would return to its original length. Analysis of these results has shown that the thermal arrest memory effect is a consequence of a stress-focusing effect and shape memory effect. The stress-focusing effect occurs when the phase transformation propagates radially in a cylindrical sample from the surface, inward to the center. Evolution and release of the thermoelastic deformations in both alloys during heating and cooling are analyzed.
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Krishnan, Madangopal. "New observations on the thermal arrest memory effect in Ni–Ti alloys." Scripta Materialia 53, no. 7 (2005): 875–79. http://dx.doi.org/10.1016/j.scriptamat.2005.05.031.

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Wada, Kiyohide, and Yong Liu. "Two-Way Memory Effect in NiTi Shape Memory Alloys." Advances in Science and Technology 59 (September 2008): 77–85. http://dx.doi.org/10.4028/www.scientific.net/ast.59.77.

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In general, the development mechanisms of TWME have long been understood as the nucleation and growth of preferentially oriented martensite guided by the internal stress. This work extends the study by investigating the effects of martensite deformation, constrained stress and retained martensite via partial reverse transformation through thermal arrest during heating on the stress-assisted two-way memory effect (SATWME) and TWME. It was observed that the generation of maximum SATWME was caused by the development of optimum internal stress. The increase of internal stress was accompanied by the increase of martensitic strain resulting from constrained cooling. When the martensitic strain exceeded the initial pre-strain, it directly influenced on the magnitudes of SATWME and TWME. The accommodation process of stress-assisted and detwinned martensite variants as a result of partial reverse transformation caused the formation of internal forward and back stresses. TWME was promoted by the dominant internal forward stress formation, while the dominance of internal back stress decreased the TWME by decreasing the martensitic strain.
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Jiang, J., L. S. Cui, Y. J. Zheng, D. Q. Jiang, Z. Y. Liu, and K. Zhao. "Negative thermal expansion arrest point memory effect in TiNi shape memory alloy and NbTi/TiNi composite." Materials Science and Engineering: A 549 (July 2012): 114–17. http://dx.doi.org/10.1016/j.msea.2012.04.013.

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Meng, Qinglin, Hong Yang, Yinong Liu, Tae-hyun Nam, and F. Chen. "Thermal arrest analysis of thermoelastic martensitic transformations in shape memory alloys." Journal of Materials Research 26, no. 10 (2011): 1243–52. http://dx.doi.org/10.1557/jmr.2011.54.

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Arizmendi, C. M., and Fereydoon Family. "Memory correlation effect on thermal ratchets." Physica A: Statistical Mechanics and its Applications 251, no. 3-4 (1998): 368–81. http://dx.doi.org/10.1016/s0378-4371(97)00662-6.

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Gorina, I. I., S. S. Yakovenko, and M. Yu Baranovich. "New Thermal Memory Effect in CLC." Molecular Crystals and Liquid Crystals Incorporating Nonlinear Optics 192, no. 1 (1990): 263–71. http://dx.doi.org/10.1080/00268949008035639.

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Minakawa, Kazunari, Neisei Hayashi, Yosuke Mizuno, and Kentaro Nakamura. "Thermal Memory Effect in Polymer Optical Fibers." IEEE Photonics Technology Letters 27, no. 13 (2015): 1394–97. http://dx.doi.org/10.1109/lpt.2015.2421950.

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De, K., S. Majumdar, and S. Giri. "Memory effect and inverse thermal hysteresis in La0.87Mn0.98Fe0.02Ox." Journal of Applied Physics 101, no. 10 (2007): 103909. http://dx.doi.org/10.1063/1.2714645.

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Rozprawy doktorskie na temat "Thermal Arrest Memory Effect"

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Jardine, A. P. "Shape memory effect thermodynamics and thermal efficiencies of NiTi." Thesis, University of Bristol, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381385.

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Kalnitsky, Alexander Carleton University Dissertation Engineering Electrical. "Memory effect and enhanced conductivity in thermal Si0 [subscript 2] implanted with Si." Ottawa, 1989.

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Dai, Wenhua. "Large signal electro-thermal LDMOSFET modeling and the thermal memory effects in RF power amplifiers." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1078935135.

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Thesis (Ph. D.)--Ohio State University, 2004.<br>Title from first page of PDF file. Document formatted into pages; contains xix, 156 p.; also includes graphics (some col.). Includes bibliographical references (p. 152-156).
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Amalraj, Julian Joyce. "Effect of variable material properties on purely thermal phase transformations in shape memory alloy wires, modeling and experiments." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0020/MQ47001.pdf.

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Krishnan, Vinu Bala. "DESIGN, FABRICATION AND TESTING OF A SHAPE MEMORY ALLOY BASED CRYOGENIC THERMAL CONDUCTION SWITCH." Master's thesis, University of Central Florida, 2004. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4404.

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Shape memory alloys (SMAs) can recover large strains (e.g., up to 8%) by undergoing a temperature-induced phase transformation. This strain recovery can occur against large forces, resulting in their use as actuators. The SMA elements in such actuators integrate both sensory and actuation functions. This is possible because SMAs can inherently sense a change in temperature and actuate by undergoing a shape change, associated with the temperature-induced phase transformation. The objective of this work is to develop an SMA based cryogenic thermal conduction switch for operation between dewars of liquid methane and liquid oxygen in a common bulk head arrangement for NASA. The design of the thermal conduction switch is based on a biased, two-way SMA actuator and utilizes a commercially available NiTi alloy as the SMA element to demonstrate the feasibility of this concept. This work describes the design from concept to implementation, addressing methodologies and issues encountered, including: a finite element based thermal analysis, various thermo-mechanical processes carried out on the NiTi SMA elements, and fabrication and testing of a prototype switch. Furthermore, recommendations for improvements and extension to NASA's requirements are presented. Such a switch has potential application in variable thermal sinks to other cryogenic tanks for liquefaction, densification, and zero boil-off systems for advanced spaceport applications. The SMA thermal conduction switch offers the following advantages over the currently used gas gap and liquid gap thermal switches in the cryogenic range: (i) integrates both sensor and actuator elements thereby reducing the overall complexity, (ii) exhibits superior thermal isolation in the open state, and (iii) possesses high heat transfer ratios between the open and closed states. This work was supported by a grant from NASA Kennedy Space Center (NAG10-323) with William U. Notardonato as Technical Officer.<br>M.S.<br>Department of Mechanical, Materials and Aerospace Engineering<br>Engineering and Computer Science<br>Mechanical, Materials and Aerospace Engineering
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Terzak, John Charles. "Modeling of Microvascular Shape Memory Composites." Youngstown State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1389719238.

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Esham, Kathryn V. "The Effect of Nanoscale Precipitates on the Templating of Martensite Twin Microstructure in NiTiHf High Temperature Shape Memory Alloys." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1494251602171757.

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Niraula, Dipesh. "Physics and applications of conductive filaments in electronic structures: from metal whiskers to solid state memory." University of Toledo / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1561471348406944.

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Dufour, Hugo. "Etude des effets multicaloriques induits lors de la transformation de phase structurale dans les composés de type Heusler." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALY024.

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Le projet de cette thèse est d'évaluer les propriétés multicaloriques, et notamment magnétocaloriques et élastocaloriques éventuellement couplées entre elles des alliages d'Heusler de type Ni-Mn-X (X= In, Co-In,...). C'est une recherche amont pouvant rapidement conduire à la recherche de développement de nouveaux dispositifs de refroidissement ou de nouvelles fonctionnalités d'où l'intérêt porté par certains acteurs du monde socio-économique. D'un point de vue fondamental, il s'agissait d'étudier la transformation structurale et magnétique qui se produit en température entre la phase cubique à haute température dite « austénite » et la phase basse température dite « martensite ». L'application d'un champ magnétique ou d'une contrainte uniaxiale déplace les températures de transformation respectivement vers les basses températures ou les hautes températures et permet également d'induire la transformation d'une phase vers l'autre. Les propriétés multicaloriques résultent de la variation d'entropie conséquente à l'application des champs mentionnés ci-dessus d'autant plus importante qu'elle se produit proche de la température de transformation.Un effort soutenu a été porté sur la détermination de la structure martensitique qui reste à ce jour non consensuelle au travers des résultats de la littérature. Or la martensite est responsable des propriétés à mémoire de forme et une connaissance de la structure a permis d'éclairer la transformation martensitique à la base des propriétés élastocaloriques.L'originalité de l'étude reposait à la fois dans l'étude des propriétés élastocaloriques, moins étudiées que les propriétés magnétocaloriques, et sur une combinaison d'approches théoriques et expérimentales. En effet, les études de diffractions neutroniques ont permis de mieux comprendre la structure cristallographique des phases. Elles ont été couplées avec des mesures expérimentales visant à déterminer les variations d'entropie. Ces mesures expérimentales reposaient également sur la mise en place de systèmes de mesure versatiles combinant généralement l'application d'une contrainte uniaxiale, un balayage en température (77K – 400K), des mesures fines en température ou en transport et l'application éventuelle d'un champ magnétique. Cette versatilité expérimentale mise en œuvre a permis d'appréhender dans sa globalité l'effet élastocalorique des alliages ferromagnétiques à mémoire de forme<br>This manuscript is devoted to the study of the multicaloric properties, and in particular magnetocaloric and elastocaloric properties possibly coupled between them, of Ni-Mn-X type Heusler alloys (X= In, Co-In,...). This preliminary research can quickly lead to the development of new cooling devices or new functionalities, hence the interest shown by certain players in the socio-economic world. To achieve this, we studied the structural and magnetic transformation that occurs in temperature between the high-temperature cubic phase known as « austenite » and the low-temperature phase known as « martensite ». The application of a magnetic field or a uniaxial strain shifts the transformation temperatures respectively towards low temperatures or high temperatures and also makes it possible to induce the transformation from one phase to the other. The multicaloric properties result from the near-transformation-temperature-entropy-variation due to the application of those external perturbations.A particular effort has been made to determine the non-consensual martensitic structure. However, martensite is responsible for shape memory properties and a knowledge of the structure led to the understanding of the martensitic transformation at the basis of elastocaloric properties.The originality of the study wad both on the study of elastocaloric properties and on a combination of theoretical and experimental approaches. Indeed, neutron diffraction studies have led to a better understanding of the crystallographic structures. They were coupled with experimental measurements to determine the entropy variations. Those measurements were based on the implementation of versatile measurement systems generally combining the application of uniaxial strains, temperature scanning (77K - 400K), fine temperature or transport measurements and the possible application of a magnetic field. This experimental versatility has made it possible to fully understand the elastocaloric effect of shape memory ferromagnetic alloys
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Guidetti, Giulia. "Cellulose photonics : designing functionality and optical appearance of natural materials." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/277918.

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Cellulose is the most abundant biopolymer on Earth as it is found in every plant cell wall; therefore, it represents one of the most promising natural resources for the fabrication of sustainable materials. In plants, cellulose is mainly used for structural integrity, however, some species organise cellulose in helicoidal nano-architectures generating strong iridescent colours. Recent research has shown that cellulose nanocrystals, CNCs, isolated from natural fibres, can spontaneously self-assemble into architectures that resemble the one producing colouration in plants. Therefore, CNCs are an ideal candidate for the development of new photonic materials that can find use to substitute conventional pigments, which are often harmful to humans and to the environment. However, various obstacles still prevent a widespread use of cellulose-based photonic structures. For instance, while the CNC films can display a wide range of colours, a precise control of the optical appearance is still difficult to achieve. The intrinsic low thermal stability and brittleness of cellulose-based films strongly limit their use as photonic pigments at the industrial scale. Moreover, it is challenging to integrate them into composites to obtain further functionality while preserving their optical response. In this thesis, I present a series of research contributions that make progress towards addressing these challenges. First, I use an external magnetic field to tune the CNC films scattering response. Then, I demonstrate how it is possible to tailor the optical appearance and the mechanical properties of the films as well as to enhance their functionality, by combining CNCs with other polymers. Finally, I study the thermal properties of CNC films to improve the retention of the helicoidal arrangement at high temperatures and to explore the potential use of this material in industrial fabrication processes, such as hot-melt extrusion.
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Książki na temat "Thermal Arrest Memory Effect"

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National Aeronautics and Space Administration (NASA) Staff. Low Temperature Creep of Hot-Extruded near-Stoichiometric Niti Shape Memory Alloy. Part 2; Effect of Thermal Cycling. Independently Published, 2019.

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Części książek na temat "Thermal Arrest Memory Effect"

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Făciu, Cristian. "Pseudoelasticity and Shape Memory Effect: A Maxwellian Rate-Type Approach." In Encyclopedia of Thermal Stresses. Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-2739-7_891.

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Pan, Fengqun, Xiangjun Jiang, Chong Ni, and Jingli Du. "Experimental Study on Thermal Ratcheting Effect of NiTi Shape Memory Alloy." In Lecture Notes in Electrical Engineering. Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9441-7_33.

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Xu, Liu-Jun, and Ji-Ping Huang. "Theory for Thermal Bi/Multistability: Nonlinear Thermal Conductivity." In Transformation Thermotics and Extended Theories. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-5908-0_18.

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AbstractIn this chapter, we theoretically design diffusive bistability (and even multistability) in the macroscopic scale, which has a similar phenomenon but a different mechanism from its microscopic counterpart (Wang et al., Phys. Rev. Lett. 101, 267203 (2008)); the latter has been extensively investigated in the literature, e.g., for building nanometer-scale memory components. By introducing second- and third-order nonlinear terms (opposite in sign) into diffusion coefficient matrices, bistable energy or mass diffusion occurs with two different steady states, identified as “0” and “1”. In particular, we study heat conduction in a two-terminal three-body system. This bistable system exhibits a macro-scale thermal memory effect with tailored nonlinear thermal conductivities. Finite-element simulations confirm the theoretical analysis. Also, we suggest experiments with metamaterials based on shape memory alloys. This framework blazes a trail in constructing intrinsic bistability or multistability in diffusive systems for macroscopic energy or mass management.
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Nam, Nguyen Duong, Vu Anh Tuan, and Pham Mai Khanh. "Influence of Thermal-Mechanical Process on the Shape Memory Effect of CuAl9Fe4Ni2 Alloys." In Proceedings of the 2nd Annual International Conference on Material, Machines and Methods for Sustainable Development (MMMS2020). Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69610-8_10.

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Sakon, T., H. Nagashio, K. Sasaki, et al. "Thermal Strain and Magnetization Studies of the Ferromagnetic Heusler Shape Memory Alloys Ni2MnGa and the Effect of Selective Substitution in 3d Elements on the Structural and Magnetic Phase." In Shape Memory Alloys - Processing, Characterization and Applications. InTech, 2013. http://dx.doi.org/10.5772/47808.

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Shahinpoor, Mohsen. "Review of Magnetic Shape Memory Smart Materials." In Fundamentals of Smart Materials. The Royal Society of Chemistry, 2020. http://dx.doi.org/10.1039/bk9781782626459-00151.

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Chapter 13 reviews magnetic shape memory alloys (MSMAs), often also referred to as ferromagnetic shape memory alloys (FSMAs), which have emerged as an interesting extension of the class of shape memory materials (SMMs). FSMAs combine the attributes and properties of ferromagnetism with a reversible martensitic crystalline solid phase transformation. Magnetically controlled shape memory (MSM) materials present a new way to produce motion and force. MSM phenomena were originally suggested by Ullakko, O'Handley, and Kantner and demonstrated these in a Ni–Mn–Ga alloy in as early as 1996. They suggested a new mechanism based on the magnetic field-induced reorientation of the twin structure of a MSMA. Effectively, the magnetic control of the shape memory effect leads to a much more rapid response of the actuator than the thermal control. The magnetic field controls the reorientation of the twin variants analogous to the way in which twin variants are controlled by stress in classical shape memory alloys. The magnetic shape memory effect has demonstrated that certain shape memory materials that are also ferromagnetic can show very large dimensional changes (6–10%) under the application of a magnetic field. These strains occur within the low-temperature (martensitic) phase.
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Shahinpoor, Mohsen. "Review of Shape Memory Alloys (SMAs) as Smart Materials." In Fundamentals of Smart Materials. The Royal Society of Chemistry, 2020. http://dx.doi.org/10.1039/bk9781782626459-00136.

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Chapter 12 reviews shape memory alloys (SMAs). The shape memory effect (SME) is a property of materials that are capable of solid phase transformation from a body-centered tetragonal form called thermoelastic martensite to a face-centered cubic superelastic called austenite. These materials are named shape memory materials (SMM) and their thermal versions are called shape memory alloys (SMAs). This solid phase transformation from the body-centered tetragonal martensite crystalline structures to a thermoelastic face-centered cubic austenite crystalline phase by either temperature, stress or strain, is called the SME. These martensitic crystalline structures are capable of returning to their original shape in the austenite phase, after a large plastic deformation in the martensitic phase and return to their original shape when heated towards austenitic transformation. These novel effects are called thermal shape memory and superelasticity (elastic shape memory), respectively. SMAs belong to the large class of smart materials because of their ability to undergo large deformations and to regain their original shape, either during unloading (superelastic effect, SE) or via thermoelastic cycling (SME). As mentioned before this is due to a solid crystalline phase (FCC to BCC) transformation (solid-to-solid) (martensitic transformation). This transformation also enables the SMAs to transform from a higher state symmetry crystal lattice (austenite) to a phase with a less symmetric lattice (martensite).
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Shahinpoor, Mohsen. "Shape Memory Polymers (SMPs) as Smart Materials." In Fundamentals of Smart Materials. The Royal Society of Chemistry, 2020. http://dx.doi.org/10.1039/bk9781782626459-00160.

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Chapter 14 reviews shape memory polymers (SMPs). Shape memory polymers belong to the family of shape memory materials (SMMs), which can be deformed into a predetermined shape under some imposed specific conditions such as temperature, electric or magnetic field, as well as strain and stress. These shapes can be relaxed back to their original field-free shapes under thermal, electrical, magnetic, strain, stress, temperature, laser, or environmental stimuli. These transformations are essentially due to the elastic energy stored in SMMs during initial deformation. As a member of SMMs, SMPs are stimuli-sensitive polymers. Shape memory polymers normally use either heat or laser light energy as a stimulant to change shape. The thermally-induced shape memory effect can be observed by irradiation with infrared light, exposure to alternating magnetic fields, application of an electric field or immersion in water.
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R. Knick, Cory. "Fabrication and Characterization of Nanoscale Shape Memory Alloy MEMS Actuators." In Advanced Functional Materials. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.92762.

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The miniaturization of engineering devices has created interest in new actuation methods capable of large displacements and high frequency responses. Shape memory alloy (SMA) thin films have exhibited one of the highest power densities of any material used in these actuation schemes and can thermally recovery strains of up to 10%. Homogenous SMA films can experience reversible shape memory effect, but without some sort of physical biasing mechanism, the effect is only one-way. SMA films mated in a multi-layer stack have the appealing feature of an intrinsic two-way shape memory effect (SME). In this work, we developed a near-equiatomic NiTi magnetron co-sputtering process and characterized shape memory effects. We mated these SMA films in several “bimorph” configurations to induce out of plane curvature in the low-temperature Martensite phase. We quantify the curvature radius vs. temperature on MEMS device structures to elucidate a relationship between residual stress, recovery stress, radius of curvature, and degree of unfolding. We fabricated and tested laser-irradiated and joule heated SMA MEMS actuators to enable rapid actuation of NiTi MEMS devices, demonstrating some of the lowest powers (5–15 mW) and operating frequencies (1–3 kHz) ever reported for SMA or other thermal actuators.
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Abdelsabour Fahmy, Mohamed. "A Novel MDD-Based BEM Model for Transient 3T Nonlinear Thermal Stresses in FGA Smart Structures." In Advanced Functional Materials. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.92829.

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The main objective of this chapter is to introduce a novel memory-dependent derivative (MDD) model based on the boundary element method (BEM) for solving transient three-temperature (3T) nonlinear thermal stress problems in functionally graded anisotropic (FGA) smart structures. The governing equations of the considered study are nonlinear and very difficult if not impossible to solve analytically. Therefore, we develop a new boundary element scheme for solving such equations. The numerical results are presented highlighting the effects of the MDD on the temperatures and nonlinear thermal stress distributions and also the effect of anisotropy on the nonlinear thermal stress distributions in FGA smart structures. The numerical results also verify the validity and accuracy of the proposed methodology. The computing performance of the proposed model has been performed using communication-avoiding Arnoldi procedure. We can conclude that the results of this chapter contribute to increase our understanding on the FGA smart structures. Consequently, the results also contribute to the further development of technological and industrial applications of FGA smart structures of various characteristics.
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Streszczenia konferencji na temat "Thermal Arrest Memory Effect"

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Yuzer, A. H., S. A. Bassam, F. M. Ghannouchi, and S. Demir. "Memory polynomial with shaped memory delay profile and modeling the thermal memory effect." In 2013 IEEE 20th International Conference on Electronics, Circuits, and Systems (ICECS). IEEE, 2013. http://dx.doi.org/10.1109/icecs.2013.6815482.

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da Rocha Souto, Cicero, Rosiane Agapito da Silva, Alexandre Cesar de Castro, Alexsandro Jose Virginio dos Santos, and Rebeca Casimiro de Souza. "Thermal cycling effect on a shape memory and piezoelectric heterostructure." In 2014 IEEE International Instrumentation and Measurement Technology Conference (I2MTC). IEEE, 2014. http://dx.doi.org/10.1109/i2mtc.2014.6860759.

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Lee, Suk-hui, Ki-Jin Kim, Sanghoon Park, K. H. Ahn, and Sung-il Bang. "Thermal memory effect modeling and compensation for GaN Doherty amplifier." In 2014 International Conference on Information and Communication Technology Convergence (ICTC). IEEE, 2014. http://dx.doi.org/10.1109/ictc.2014.6983320.

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Minakawa, Kazunari, Neisei Hayashi, Yosuke Mizuno, and Kentaro Nakamura. "Experimental study on thermal memory effect in plastic optical fibers." In 2015 Opto-Electronics and Communications Conference (OECC). IEEE, 2015. http://dx.doi.org/10.1109/oecc.2015.7340147.

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Rodrigez, P., and G. Guénin. "Thermal and Thermomechanical Stability of Cu-Al-Ni Shape Memory Effect." In ESOMAT 1989 - Ist European Symposium on Martensitic Transformations in Science and Technology. EDP Sciences, 1989. http://dx.doi.org/10.1051/esomat/198903004.

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Zhe Chen, Peng Huang, Haitong Li, et al. "Optimization of uniformity in resistive switching memory by reducing thermal effect." In 2014 IEEE 12th International Conference on Solid -State and Integrated Circuit Technology (ICSICT). IEEE, 2014. http://dx.doi.org/10.1109/icsict.2014.7021321.

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Kamaya, Masayuki. "Crack Growth Under Thermal Fatigue Loading (Effect of Stress Gradient and Relaxation)." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77547.

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Thermal fatigue is a critical problem in nuclear power plants. To prevent crack initiation, JSME has issued a guideline for design. In this study, the feasibility of incorporating crack growth analysis into the design and integrity evaluation was investigated. Two characteristics of thermal fatigue loading were considered. The first was the effects of stress gradient in the depth direction. It was shown that the steep stress gradient near the surface significantly reduced the stress intensity factor (SIF) of deep cracks. Assuming that crack growth is arrested by small SIF, it is possible to leave detected cracks unrepaired. Otherwise, the cracks should be removed regardless of their size. The other characteristic is the displacement controlled boundary condition. Through finite element analyses, it was revealed that the displacement controlled boundary condition reduces SIF, and the magnitude of the reduction in SIF depends on the crack depth and boundary length. It is concluded that, under thermal fatigue loading, the cracks that are detected in the in-service inspection have already been arrested if they do not penetrate the wall thickness. The crack arrest scenario is a reasonable method of assessing the integrity of cracked components.
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Yukio Takahashi, Ryo Ishikawa, and Kazuhiko Honjo. "Precise modeling of thermal memory effect for power amplifier using multi-stage thermal RC-ladder network." In 2006 Asia-Pacific Microwave Conference. IEEE, 2006. http://dx.doi.org/10.1109/apmc.2006.4429424.

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Deak, J. G., A. V. Pohm, and J. M. Daughton. "Effect of Memory Element Resistance-Area-Product and Thermal Environment on Writing of Magneto-Thermal MRAM." In INTERMAG 2006 - IEEE International Magnetics Conference. IEEE, 2006. http://dx.doi.org/10.1109/intmag.2006.376119.

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Navarro y de Sosa, I., A. Bucht, T. Junker, K. Pagel, and W. G. Drossel. "Thermo-mechanical self-adaptive ball screw drive using thermal shape memory effect." In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, edited by Nakhiah C. Goulbourne and Hani E. Naguib. SPIE, 2013. http://dx.doi.org/10.1117/12.2009599.

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Raporty organizacyjne na temat "Thermal Arrest Memory Effect"

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Yahav, Shlomo, John Brake, and Noam Meiri. Development of Strategic Pre-Natal Cycling Thermal Treatments to Improve Livability and Productivity of Heavy Broilers. United States Department of Agriculture, 2013. http://dx.doi.org/10.32747/2013.7593395.bard.

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The necessity to improve broiler thermotolerance and live performance led to the following hypothesis: Appropriate comprehensive incubation treatments that include significant temperature management changes will promote angiogenesis and will improve acquisition of thermotolerance and carcass quality of heavy broilers through epigenetic adaptation. It was based on the following questions: 1. Can TM during embryogenesis of broilers induce a longer-lasting thermoregulatory memory (up to marketing age of 10 wk) that will improve acquisition of thermotolerance as well as increased breast meat yield in heavy broilers? 2. The improved sensible heat loss (SHL) suggests an improved peripheral vasodilation process. Does elevated temperature during incubation affect vasculogenesis and angiogenesis processes in the chick embryo? Will such create subsequent advantages for heavy broilers coping with adverse hot conditions? 3. What are the changes that occur in the PO/AH that induce the changes in the threshold response for heat production/heat loss based on the concept of epigenetic temperature adaptation? The original objectives of this study were as follow: a. to assess the improvement of thermotolerance efficiency and carcass quality of heavy broilers (~4 kg); b. toimproveperipheral vascularization and angiogenesis that improve sensible heat loss (SHL); c. to study the changes in the PO/AH thermoregulatory response for heat production/losscaused by modulating incubation temperature. To reach the goals: a. the effect of TM on performance and thermotolerance of broilers reared to 10 wk of age was studied. b. the effect of preincubation heating with an elevated temperature during the 1ˢᵗ 3 to 5 d of incubation in the presence of modified fresh air flow coupled with changes in turning frequency was elucidated; c.the effect of elevated temperature on vasculogenesis and angiogenesis was determined using in ovo and whole embryo chick culture as well as HIF-1α VEGF-α2 VEGF-R, FGF-2, and Gelatinase A (MMP2) gene expression. The effects on peripheral blood system of post-hatch chicks was determined with an infrared thermal imaging technique; c. the expression of BDNF was determined during the development of the thermal control set-point in the preoptic anterior hypothalamus (PO/AH). Background to the topic: Rapid growth rate has presented broiler chickens with seriousdifficulties when called upon to efficiently thermoregulate in hot environmental conditions. Being homeotherms, birds are able to maintain their body temperature (Tb) within a narrow range. An increase in Tb above the regulated range, as a result of exposure to environmental conditions and/or excessive metabolic heat production that often characterize broiler chickens, may lead to a potentially lethal cascade of irreversible thermoregulatory events. Exposure to temperature fluctuations during the perinatal period has been shown to lead to epigenetic temperature adaptation. The mechanism for this adaptation was based on the assumption that environmental factors, especially ambient temperature, have a strong influence on the determination of the “set-point” for physiological control systems during “critical developmental phases.” Recently, Piestunet al. (2008) demonstrated for the first time that TM (an elevated incubation temperature of 39.5°C for 12 h/d from E7 to E16) during the development/maturation of the hypothalamic-hypophyseal-thyroid axis (thermoregulation) and the hypothalamic-hypophyseal-adrenal axis (stress) significantly improved the thermotolerance and performance of broilers at 35 d of age. These phenomena raised two questions that were addressed in this project: 1. was it possible to detect changes leading to the determination of the “set point”; 2. Did TM have a similar long lasting effect (up to 70 d of age)? 3. Did other TM combinations (pre-heating and heating during the 1ˢᵗ 3 to 5 d of incubation) coupled with changes in turning frequency have any performance effect? The improved thermotolerance resulted mainly from an efficient capacity to reduce heat production and the level of stress that coincided with an increase in SHL (Piestunet al., 2008; 2009). The increase in SHL (Piestunet al., 2009) suggested an additional positive effect of TM on vasculogenesis and angiogensis. 4. In order to sustain or even improve broiler performance, TM during the period of the chorioallantoic membrane development was thought to increase vasculogenesis and angiogenesis providing better vasodilatation and by that SHL post-hatch.
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Meiri, Noam, Michael D. Denbow, and Cynthia J. Denbow. Epigenetic Adaptation: The Regulatory Mechanisms of Hypothalamic Plasticity that Determine Stress-Response Set Point. United States Department of Agriculture, 2013. http://dx.doi.org/10.32747/2013.7593396.bard.

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Our hypothesis was that postnatal stress exposure or sensory input alters brain activity, which induces acetylation and/or methylation on lysine residues of histone 3 and alters methylation levels in the promoter regions of stress-related genes, ultimately resulting in long-lasting changes in the stress-response set point. Therefore, the objectives of the proposal were: 1. To identify the levels of total histone 3 acetylation and different levels of methylation on lysine 9 and/or 14 during both heat and feed stress and challenge. 2. To evaluate the methylation and acetylation levels of histone 3 lysine 9 and/or 14 at the Bdnfpromoter during both heat and feed stress and challenge. 3. To evaluate the levels of the relevant methyltransferases and transmethylases during infliction of stress. 4. To identify the specific localization of the cells which respond to both specific histone modification and the enzyme involved by applying each of the stressors in the hypothalamus. 5. To evaluate the physiological effects of antisense knockdown of Ezh2 on the stress responses. 6. To measure the level of CpG methylation in the promoter region of BDNF in thermal treatments and free-fed, 12-hour fasted, and re-fed chicks during post-natal day 3, which is the critical period for feed-control establishment, and 10 days later to evaluate longterm effects. 7. The phenotypic effect of antisense “knock down” of the transmethylaseDNMT 3a. Background: The growing demand for improvements in poultry production requires an understanding of the mechanisms governing stress responses. Two of the major stressors affecting animal welfare and hence, the poultry industry in both the U.S. and Israel, are feed intake and thermal responses. Recently, it has been shown that the regulation of energy intake and expenditure, including feed intake and thermal regulation, resides in the hypothalamus and develops during a critical post-hatch period. However, little is known about the regulatory steps involved. The hypothesis to be tested in this proposal is that epigenetic changes in the hypothalamus during post-hatch early development determine the stress-response set point for both feed and thermal stressors. The ambitious goals that were set for this proposal were met. It was established that both stressors i.e. feed and thermal stress, can be manipulated during the critical period of development at day 3 to induce resilience to stress later in life. Specifically it was established that unfavorable nutritional conditions during early developmental periods or heat exposure influences subsequent adaptability to those same stressful conditions. Furthermore it was demonstrated that epigenetic marks on the promoter of genes involved in stress memory are altered both during stress, and as a result, later in life. Specifically it was demonstrated that fasting and heat had an effect on methylation and acetylation of histone 3 at various lysine residues in the hypothalamus during exposure to stress on day 3 and during stress challenge on day 10. Furthermore, the enzymes that perform these modifications are altered both during stress conditioning and challenge. Finally, these modifications are both necessary and sufficient, since antisense "knockdown" of these enzymes affects histone modifications, and as a consequence stress resilience. DNA methylation was also demonstrated at the promoters of genes involved in heat stress regulation and long-term resilience. It should be noted that the only goal that we did not meet because of technical reasons was No. 7. In conclusion: The outcome of this research may provide information for the improvement of stress responses in high yield poultry breeds using epigenetic adaptation approaches during critical periods in the course of early development in order to improve animal welfare even under suboptimum environmental conditions.
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