Bibliographies thématiques / Material Transformations

Littérature scientifique sur le sujet « Material Transformations »

Auteur : Grafiati
Publié le 18 mai 2024

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Articles de revues sur le sujet "Material Transformations"

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Margienė, Asta, et Simona Ramanauskaitė. « Toward Adaptability of E-Evaluation : Transformation from Tree-Based to Graph-Based Structure ». Applied Sciences 11, no 9 (29 avril 2021) : 4082. http://dx.doi.org/10.3390/app11094082.

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The COVID-19 pandemic and quarantine have forced students to use distance learning. Modern information technologies have enabled global e-learning usage but also revealed a lack of personalization and adaptation in the learning process when compared to face-to-face learning. While adaptive e-learning methods exist, their practical application is slow because of the additional time and resources needed to prepare learning material and its logical adaptation. To increase e-learning materials’ usability and decrease the design complexity of automated adaptive students’ work evaluation, we propose several transformations from a competence tree-based structure to a graph-based automated e-evaluation structure. Related works were summarized to highlight existing e-evaluation structures and the need for new transformations. Competence tree-based e-evaluation structure improvements were presented to support the implementation of top-to-bottom and bottom-to-top transformations. Validation of the proposed transformation was executed by analyzing different use-cases and comparing them to the existing graph-to-tree transformation. Research results revealed that the competence tree-based learning material storage is more reusable than graph-based solutions. Competence tree-based learning material can be transformed for different purposes in graph-based e-evaluation solutions. Meanwhile, graph-based learning material transformation to tree-based structure implies material redundancy, and the competence of the tree structure cannot be restored.
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Gorobets, Valery, Ievgen Antypov, Viktor Trokhaniak et Yurii Bohdan. « Experimental and numerical studies of heat and mass transfer in low-temperature heat accumulator with phase transformations of accumulating material ». MATEC Web of Conferences 240 (2018) : 01009. http://dx.doi.org/10.1051/matecconf/201824001009.

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Accumulation of thermal energy is produced with the aim of storing at certain times, when there is an overabundance of this energy and its further use in other periods of time when there is a deficit thermal energy. Thermal energy storage may be carried out under heating of any material (water, solid materials etc.) or by using the phase or chemical transformation of the material (melting and crystallization processes, direct and reverse chemical reaction). Thermal accumulators with phase or chemical transformations are allowed to concentrate a large amount of energy in a relatively small volume of accumulating material. In this paper an experimental study and numerical modeling of heat and mass transfer in the heat accumulator during phase transformations of the accumulating material are presented. The experimental plant consists of a chamber filled with paraffin. In experimental studies, the changes of the temperature distribution in heat accumulating material and tube bundles have investigated. Numerical simulation of melting and solidification of heat accumulating material during the heated and cooled of tube bundles were performed. As the results of research, the basic laws of melting and crystallization processes in heat accumulator during phase transformations of heat accumulating material were determined.
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Antoni, Grégory. « Effects of ThermoMechanical Coupling in Tribological Surface Transformations : A One-Dimensional Modelling Including Irreversible Solid-Solid Phase Transformations and Classical Plasticity ». Journal of Materials 2013 (28 avril 2013) : 1–7. http://dx.doi.org/10.1155/2013/892050.

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Under compressive loads combined with friction, some materials undergo Tribological Surface Transformations (TSTs) on the surface of the loaded parts and in the immediately vicinity, which in the case of metals, are known as irreversible solid-solid phase transformations. During the solid-solid phase transformations occurring under mechanical loads, TRansformation Induced Plasticity (TRIP) processes are generated at much lower stress levels than those associated with the yield strength of the material in classical plasticity. In order to assess the effects of thermomechanical coupling in these TSTs, a one-dimensional modelling based on irreversible solid-solid phase transformations and classical plasticity is presented and discussed.
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Weng, Zi-Hua. « Basic postulates of some coordinate transformations within material media ». AIP Advances 12, no 12 (1 décembre 2022) : 125016. http://dx.doi.org/10.1063/5.0132194.

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This paper aims to explore the physical quantities of several invariants, including the basic postulates of some types of crucial coordinate transformations, conservation laws, and continuity equations, in the electromagnetic and gravitational fields. Maxwell first utilized quaternions to describe the electromagnetic theory. Subsequent scholars make use of octonions to study the physical properties of electromagnetic and gravitational fields simultaneously, including the octonion field strength, field source, angular momentum, torque, and force. When an octonion coordinate system transforms rotationally, the scalar part of one octonion will remain unchanged, although the vector part of the octonion may alter. In the octonion space [Formula: see text], some invariants can be derived from this octonion property. A part of these invariants can be selected as the basic postulates of Galilean transformation or Lorentz transformation. Similarly, several invariants can be derived from the octonion property in the transformed octonion space [Formula: see text], and the invariants can be chosen as the basic postulates of a few new types of coordinate transformations. Furthermore, the combination of invariants in the octonion spaces can be applied as the basic postulates of some new coordinate transformations, relevant to the norm of physical quantities. Through the analysis, it is easy to find that each conserved quantity has its preconditions from the perspective of octonion spaces. This is helpful to deepen the further understanding of the physical properties of conservation laws and other invariants.
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Cottam, Ryan, Vladimir Luzin, Kevin Thorogood, Yat C. Wong et Milan Brandt. « The Role of Metallurgical Solid State Phase Transformations on the Formation of Residual Stress in Laser Cladding and Heating ». Materials Science Forum 777 (février 2014) : 19–24. http://dx.doi.org/10.4028/www.scientific.net/msf.777.19.

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There are two major types of solid state phase transformations in metallic materials; the formation of second phase particles during heat treatments, and the transformation of the matrix from one crystalline packing arrangement to another during either heating or cooling. These transformations change the spacing between adjacent atoms and can thus influence the residual stress levels formed. The heating and cooling cycles of materials processing operations using lasers such as cladding and melting/heating, can induce phase transformations depending on the character of the material being processed. This paper compares the effects of the different phase transformations and also the influence of the type of laser processing on the final residual stress formed. The comparisons are made between laser clad AA7075, laser clad Ti-6Al-4V and laser melted nickel-aluminium bronze using neutron diffraction and the contour method of measuring residual stress.
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Waimann, Johanna, Philipp Junker et Klaus Hackl. « A variational material model for transformation-induced plasticity in polycrystalline steels ». Journal of the Mechanical Behavior of Materials 24, no 5-6 (1 décembre 2015) : 153–59. http://dx.doi.org/10.1515/jmbm-2015-0022.

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AbstractThis work presents a variational material model for transformation-induced plasticity in steels. We will use the principle of the minimum of the dissipation potential to develop a coupled material model for plastic deformations and phase transformations that simultaneously accounts for the hardening effects that play an important role. We will use a polycrystalline approach and introduce a combined Voigt/Reuß bound and a coupled ansatz for the dissipation functional to model the simultaneous effects of plastic deformations and phase transformations. Finally, we will present the first numerical results for a tension/compression test.
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Jensen, Casper Bruun. « Material Itineraries : Southeast Asian Urban Transformations ». East Asian Science, Technology and Society : An International Journal 15, no 2 (3 avril 2021) : 124–34. http://dx.doi.org/10.1080/18752160.2021.1917840.

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Gubin, Sergey P. « Triad matter –- substance – material ». Radioelectronics. Nanosystems. Information Technologies. 14, no 3 (19 septembre 2022) : 341–48. http://dx.doi.org/10.17725/rensit.2022.14.341.

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An essay on the philosophical aspects of materials science in the absence of a modern philosophical category "material" is presented. The features of the categories "substance" and "material" are considered, which express the distinctive properties of the corresponding objects of nature - the formlessness of the substance and the proper form of the material, the size of the particles of the substance and the structural form of the material. Substance-material mutual transformations, their energy aspects, a certain conditionality of the substance-material boundary, and adequate filling of the corresponding categories are analyzed. Also noted is the virtual reality of the elements of the structure of matter and material, its dependence on the distorting influence of experimental tools. The prospects of translating the regularities of matter-material transformation to extraterrestrial objects are noted.
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Ding, Zi Shan, Bei Zhi Li, Pan Zou et Steven Y. Liang. « Material Phase Transformation during Grinding ». Advanced Materials Research 1052 (octobre 2014) : 503–8. http://dx.doi.org/10.4028/www.scientific.net/amr.1052.503.

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This study investigated the process parameters effect on the phase transformation during grinding by experimental validation and correlation analyses. The quantitative material phase link to the kinetics of diffusion-controlled as well as diffusionless transformations in different strain rate and contact zone temperature by examining process parameters is presented. Based upon the mechanical physics-based modeling and prediction for the volume fraction of phase transformation in continuous heating under anisothermal conditions, the correlation between volume fractions of phase in sequential segmented isothermal processes, and grinding process parameters characteristic are developed. In validation of the correlation, a series of maraging steel 250 grinding experiments, XRD measurements, and correlation analyses were pursued. Certain linear correlations between the cutting parameters and the phase transformation were calculated by using the correlation coefficient and the affected degree of cutting parameter, temperature, and strain rate was evaluated by applying partial relation coefficient analysis method. It is practical to alter the part material properties through the phase transformation with process parameters optimal control.
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Hubbell, Jeffrey A. « In Situ Material Transformations in Tissue Engineering ». MRS Bulletin 21, no 11 (novembre 1996) : 33–35. http://dx.doi.org/10.1557/s0883769400031821.

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Novel applications exist for biomedical materials that can undergo transitions in material properties in situ—that is, at the site of implantation in the body. Such transitions in polymeric biomaterials can be accomplished by crosslinking a material in situ, by heating or cooling to induce thermal transitions, and by precipitating polymer from solution in situ. This article will point out the need for materials that can be induced to undergo such transitions in situ and will describe selected tissue-engineering approaches that have been employed for this purpose.Delivering materials to the body in one form and utilizing them in another form after a transition at the site of implantation has, generally speaking, two potential advantages: (1) the ability to match the morphology of a material implant to a complex tissue shape and (2) the ability to deliver a large device through a small hole in the body. With respect to the former motivation, tissue shapes in the body have an enormous range of complexity: a region of a blood vessel—for example with a curved central axis, a diameter that varies along the length, an eccentric diseased plaque, and numerous side branches. One could develop a variety of implant shapes—arterial stents in this example (for use in structurally supporting arteries after balloon angioplasty, thereby creating a larger cross section for blood flow above the diseased plaque)—and then select the most appropriate implant shape after detailed imaging of the tissue site. One can alternatively attempt to employ some material transformation to deliver a precursor to the final shape of the implant, utilizing the tissue shape to obtain the proper final implant morphology. With regard to the second motivation, it may be desirable to deliver a large object through a small hole, utilizing material transformations. Advances in surgery have focused on manipulating (cutting, coagulating, suturing, stapling) large tissue sites through small holes in the body via minimally invasive surgery. Using such approaches, it has become possible to perform many complex surgical procedures in the joints, abdominopelvic cavity, thoracic cavity, and nasal sinuses, for example, using surgical instruments that are manipulated through surgical access holes less than 1 cm in diameter. Even procedures as complex as coronary-artery bypass surgery have been performed in this way. It still remains generally impossible however to implant devices in the body through such holes unless these implants are very small. If such devices were for example able to be delivered as liquids and then shaped into devices at the implant site, such minimally invasive surgical-device placement could be envisioned.
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Thèses sur le sujet "Material Transformations"

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Douglass, Ian Michael. « A Computational Study of Material Transformations in Glass Forming Systems ». Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/19729.

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Amorphous solids (glasses) are a class of materials that lack the traditional long-range order found in crystals, and are primarily formed by rapid cooling of a liquid to bypass crystal nucleation. Their lack of crystallinity and associated defects gives them useful electromagnetic and mechanical properties. However, the affinity of a material to vitrification is only loosely understood, and structural detail is difficult to obtain via traditional methods. This thesis firstly investigates the promotion of glass formation via crystal inhibition. Molecular dynamics simulations of binary alloys are used to show crystal frustration via specific interactions of interaction range and particle softness, resulting in a lower enthalpic drive and complex crystal structures. Secondly, a facilitated kinetic Ising model is used to investigate the dynamics of organic glasses in solution. Glass dissolution is shown to have a non-linear dependence on the effective temperature of the solute, switching between a front-like dissolution at low temperatures, and a diffuse interface at higher temperatures. Also shown is a method of preparing an enhanced glass via precipitation from a solution, capable of creating a much lower energy glass than simple bulk cooling.
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Murphy, Celine. « Reconciling materials, artefacts and images : an examination of the material transformations undergone by the Philioremos anthropomorphic figurines ». Thesis, University of Kent, 2016. https://kar.kent.ac.uk/57949/.

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Visually-compelling small finds have traditionally been examined for their appearances. These artefacts, consisting of figurines, ornaments and body adornments, for example, have been primarily studied for the meanings that the images they project might have held. Strikingly fewer are analyses of these objects' material qualities. Frequently ignored are their composition, the sourcing and working of their materials, or their materiality. The aim of this thesis is to reconcile considerations of the visual and material aspects of visually compelling small finds. It is here argued that examinations of the material aspects of artefacts can reveal important information about the course of their production and consumption, and about the nature of the relationships involved therein. The volume's reconciliatory endeavour is thus undertaken with the creation of a new materially-inclusive, biographically-orientated, methodologically-holistic and multi-scalar framework. Bolstered by theories drawn from philosophy and the social sciences, this methodology allows for closer investigations into the web of closely-knit inter-nodal relationships maintained between humans, materials and the environment during the making and the use of material culture. The following chapters present the results of the framework's application to the clay anthropomorphic figurines from the Minoan peak sanctuary of Philioremos. The various ways in which clay was engaged with during the different stages of the figurines' becoming and unbecoming are explored. The types of relationships that the artefacts' production and consumption depended upon and engendered, alongside the types of knowledge these dynamics were rooted in, are then discussed. Subsequently, broader considerations of the use of the human body as a representational theme are undertaken. In reconciling examinations of the visual and material qualities of the Philioremos figurines, this thesis demonstrates the utility of a materially-integrative approach. Ultimately, this study contributes to two main areas of current archaeological interest simultaneously: the analysis of prehistoric material culture and the examination of Minoan peak sanctuary anthropomorphic figurines more specifically.
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Grimes, Jodi Elisabeth. « Rhetorical Transformations of Trees in Medieval England : From Material Culture to Literary Representation ». Thesis, University of North Texas, 2008. https://digital.library.unt.edu/ark:/67531/metadc12130/.

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Literary texts of medieval England feature trees as essential to the individual and communal identity as it intersects with nature, and the compelling qualities and organic processes associated with trees help vernacular writers interrogate the changing nature of this character. The early depiction of trees demonstrates an intimacy with nature that wanes after the tenth-century monastic revival, when the representation of trees as living, physical entities shifts toward their portrayal as allegorical vehicles for the Church's didactic use. With the emergence of new social categories in the late Middle Ages, the rhetoric of trees moves beyond what it means to forge a Christian identity to consider the role of a ruler and his subjects, the relationship between humans and nature, and the place of women in society. Taking as its fundamental premise that people in wooded regions develop a deep-rooted connection to trees, this dissertation connects medieval culture and the physical world to consider the variety of ways in which Anglo-Saxon and post-Norman vernacular manuscripts depict trees. A personal identification with trees, a desire for harmony between society and the environment, and a sympathy for the work of trees lead to the narrator's transformation in the Dream of the Rood. The Tree of Knowledge of Good and Evil in the Junius 11 manuscript, illustrated in Genesis A, Genesis B, and manuscript images, scrutinizes the Anglo-Saxon Christian's relationship and responsibility to God in the aftermath of the Fall. As writers transform trees into allegories in works like Genesis B and Geoffrey Chaucer's Parson's Tale, the symbolic representations retain their spontaneous, organic processes to offer readers a visual picture of the Christian interior-the heart. Whereas the Parson's Tale promotes personal and radical change through a horticultural narrative starring the Tree of Penitence and Tree of Vices, Chaucer's Knight's Tale appraises the role of autonomous subjects in a tyrannical system. Forest laws of the post-Norman period engender a bitter polemic about the extent of royal power to appropriate nature, and the royal grove of the Knight's Tale exposes the limitations of monarchical structures and masculine control and shapes a pragmatic response to human failures.
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Grimes, Jodi Elisabeth Upchurch Robert K. « Rhetorical transformations of trees in medieval England from material culture to literary representation / ». [Denton, Tex.] : University of North Texas, 2008. http://digital.library.unt.edu/ark:/67531/metadc12130.

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Horacek, Ivana. « Alchemy of the gift : things and material transformations at the court of Rudolf II ». Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/52830.

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The full abstract for this thesis is available in the body of the thesis, and will be available when the embargo expires.
Arts, Faculty of
Art History, Visual Art and Theory, Department of
Graduate
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McDonald, F. P. « Charting material memories : an ethnography of visual and material transformations of woollen blankets in Canada, Aotearoa New Zealand, and the United States ». Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1447476/.

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Taking one thing—the industrially produced woollen blanket—as an object of investigation, this thesis sets out to bring together a study of aesthetics, materiality, and locality in relation to the woollen blanket to consider it as a possible “technology of enchantment” (Gell 1998) in both its original and transformed states. This dissertation investigates the aesthetic transformations of the woollen blanket into art, craft, and Indigenous cultural property within our current historical moment and within specific abstract and concrete localities. Two distinct locations, Aotearoa New Zealand and North America, where such acts of transformation upon woollen blankets have had a sustained presence, are examined and compared. This project attempts to address how focusing upon the acts of transformation of materials makes visible a gap in the literature where more consideration into the movement and consumption of materials simultaneously in multiple locations is needed. The dynamism of multi-vocal and, yet, intensely local uses and transformations of woollen blankets reveal that movement and consumption are together a single transformative act. What results from these acts of transformation are both tangible and intangible values that will be described through case studies of use in order to draw out the imagined futurity of woollen blankets in their ‘renewed’ forms against their historical and colonial legacies. The varied values that emerge from distinct aesthetic transformations enable a new reading of the importance of aesthetic and creative manipulations of materials and matter that informs the local take-up of an industrial product. This thesis pushes beyond a current analytical framework that has considered how objects come to be entangled in local and global meanings through either their social life or biography. Instead this thesis focuses on the intentional transformations of materials that inform larger critical arguments around how both Indigenous and non-Indigenous individuals and communities fashion cultural knowledge and identity through soft materials that are themselves manifestations of the hard-edged, imperial, colonial, and industrial projects.
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Choudhary, Muhammad Ajmal [Verfasser], et Heike [Akademischer Betreuer] Emmerich. « Modeling microstructural evolution and phase transformations in material science / Muhammad Ajmal Choudhary. Betreuer : Heike Emmerich ». Bayreuth : Universität Bayreuth, 2016. http://d-nb.info/1113107294/34.

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Sun, Xinxing. « Phase Transformations and Switching of Chalcogenide Phase-change Material Films Prepared by Pulsed Laser Deposition ». Doctoral thesis, Universitätsbibliothek Leipzig, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-224762.

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The thesis deals with the preparation, characterization and, in particular, with the switching properties of phase-change material (PCM) thin films. The films were deposited using the Pulsed Laser Deposition (PLD) technique. Phase transformations in these films were triggered by means of thermal annealing, laser pulses, and electrical pulses. The five major physical aspects structure transformation, crystallization kinetics, topography, optical properties, and electrical properties have been investigated using XRD, TEM, SEM, AFM, DSC, UV-Vis spectroscopy, a custom-made nanosecond UV laser pump-probe system, in situ resistance measurements, and conductive-AFM. The systematic investigation of the ex situ thermally induced crystallization process of pure stoichiometric GeTe films and O-incorporating GeTe films provides detailed information on structure transformation, topography, crystallization kinetics, optical reflectivity and electrical resistivity. The results reveal a significant improvement of the thermal stability in PCM application for data storage. With the aim of reducing the switching energy consumption and to enhance the optical reflectivity contrast by improving the quality of the produced films, the growth of the GeTe films with simultaneous in situ thermal treatment was investigated with respect to optimizing the film growth conditions, e.g. growth temperature, substrate type. For the investigation of the fast phase transformation process, GeTe films were irradiated by ns UV laser pulses, tailoring various parameters such as pulse number, laser fluence, pulse repetition rate, and film thickness. Additionally, the investigation focused on the comparison of crystallization of GST thin films induced by either nano- or femtosecond single laser pulse irradiation, used to attain a high data transfer rate and to improve the understanding of the mechanisms of fast phase transformation. Non-volatile optical multilevel switching in GeTe phase-change films was identified to be feasible and accurately controllable at a timescale of nanoseconds, which is promising for high speed and high storage density of optical memory devices. Moreover, correlating the dynamics of the optical switching process and the structural information demonstrated not only exactly how fast phase change processes take place, but also, importantly, allowed the determination of the rapid kinetics of phase transformation on the microscopic scale. In the next step, a new general concept for the combination of PCRAM and ReRAM was developed. Bipolar electrical switching of PCM memory cells at the nanoscale can be achieved and improvements of the performance in terms of RESET/SET operation voltage, On/Off resistance ratio and cycling endurance are demonstrated. The original underlying mechanism was verified by the Poole-Frenkel conduction model. The polarity-dependent resistance switching processes can be visualized simultaneously by topography and current images. The local microstructure on the nanoscale of such memory cells and the corresponding local chemical composition were correlated. The gained results contribute to meeting the key challenges of the current understanding and of the development of PCMs for data storage applications, covering thin film preparation, thermal stability, signal-to-noise ratio, switching energy, data transfer rate, storage density, and scalability.
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Della, Porta Francesco M. G. « Selection mechanisms for microstructures and reversible martensitic transformations ». Thesis, University of Oxford, 2018. http://ora.ox.ac.uk/objects/uuid:085f0e90-6d07-4cb6-9bb9-13517de1b65e.

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The work in this thesis is inspired by the fabrication of Zn45Au30Cu25. This is the first alloy undergoing ultra-reversible martensitic transformations and closely satisfying the cofactor conditions, particular conditions of geometric compatibility between phases, which were conjectured to influence reversibility. With the aim of better understanding reversibility, in this thesis we study the martensitic microstructures arising during thermal cycling in Zn45Au30Cu25, which are complex and different in every phase transformation cycle. Our study is developed in the context of continuum mechanics and nonlinear elasticity, and we use tools from nonlinear analysis. The first aim of this thesis is to advance our understanding of conditions of geometric compatibility between phases. To this end, first, we further investigate cofactor conditions and introduce a physically-based metric to measure how closely these are satisfied in real materials. Secondly, we introduce further conditions of compatibility and show that these are nearly satisfied by some twins in Zn45Au30Cu25. These might influence reversibility as they improve compatibility between high and low temperature phases. Martensitic phase transitions in Zn45Au30Cu25 are a complex phenomenon, especially because the crystalline structure of the material changes from a cubic to a monoclinic symmetry, and hence the energy of the system has twelve wells. There exist infinitely many energy-minimising microstructures, limiting our understanding of the phenomenon as well as our ability to predict it. Therefore, the second aim of this thesis is to find criteria to select physically-relevant energy minimisers. We introduce two criteria or selection mechanisms. The first involves a moving mask approximation, which allows one to describe some experimental observations on the dynamics, while the second is based on using vanishing interface energy. The moving mask approximation reflects the idea of a moving curtain covering and uncovering microstructures during the phase transition, as appears to be the case for Zn45Au30Cu25, and many other materials during thermally induced transformations. We show that the moving mask approximation can be framed in the context of a model for the dynamics of nonlinear elastic bodies. We prove that every macroscopic deformation gradient satisfying the moving mask approximation must be of the form 1 + a(x) ⊗ n(x), for a.e. x. With regards to vanishing interface energy, we consider a one-dimensional energy functional with three wells, which simplifies the physically relevant model for martensitic transformations, but at the same time highlights some key issues. Our energy functional admits infinitely many minimising gradient Young measures, representing energy-minimising microstructures. In order to select the physically relevant ones, we show that minimisers of a regularised energy, where the second derivatives are penalised, generate a unique minimising gradient Young measure as the perturbation vanishes. The results developed in this thesis are motivated by the study of Zn45Au30Cu25, but their relevance is not limited to this material. The results on the cofactor conditions developed here can help for the understanding of new alloys undergoing ultra-reversible transformations, and as a guideline for the fabrication of future materials. Furthermore, the selection mechanisms studied in this work can be useful in selecting physically relevant microstructures not only in Zn45Au30Cu25, but also in other materials undergoing martensitic transformations, and other phenomena where pattern formation is observed.
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Oueslati, Jamel. « Contribution à l'étude numérique des grandes transformations élastoplastiques ». Paris 6, 1986. http://www.theses.fr/1986PA066132.

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On cherche à étudier aux grandes transformations des moyens de calcul permettant de traiter des problèmes généraux d'équilibre élastoplastiques de structures planes ou axosymétriques; ces structures peuvent subir de grands déplacements, de grandes rotations et de grandes déformations plastiques, les déformations élastiques étant supposées petites. On se limite au cas du matériau initialement isotrope, avec écrouissage isotrope ou cinématique.
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Livres sur le sujet "Material Transformations"

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Montgomery Museum of Fine Arts. Material transformations. Montgomery, Alabama : Montgomery Museum of Fine Arts, 2013.

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Conneller, Chantal. An archaeology of materials : Substantial transformations in early prehistoric Europe. New York : Routledge, 2011.

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Porter, David A. Phase transformations in metals and alloys. 3e éd. Boca Raton, FL : Taylor & Francis Group, 2008.

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1933-, Easterling Kenneth E., dir. Phase transformations in metals and alloys. 2e éd. Cheltenham : Stanley Thornes, 2000.

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1924-, Cahn R. W., Haasen P. 1927- et Kramer E. J, dir. Materials science and technology : A comprehensive treatment. Weinheim : VCH, 1990.

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1948-, Ball J. M., et Heriot-Watt University. Dept. of Mathematics., dir. Material instabilities in continuum mechanics : Related mathematical problems : the proceedings of a symposium year on material instabilities in continuum mechanics. Oxford : Clarendon Press, 1988.

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Cevelev, Aleksandr. Material resource management. Material and technical support (railway transport). ru : INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1524028.

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The textbook presents the theoretical and practical issues of the methodology of material and technical support, as well as the developing provisions of the academic disciplines "Material Resource Management" and "Logistics of supply" of railway transport. Such issues as the concept of strategic management, breakthrough transformations in the supply system, quality management, lean manufacturing, process approach, logistics analysis and cybernetics of business technologies, development strategies, management innovations based on the ARIS modeling environment, production inventory management in railway transport, and many others are considered in detail. It is intended for students studying in the areas of "Management", "Economics", as well as for all those interested in the economics of railway transport and supply logistics. It will be useful for managers and specialists of JSC "Russian Railways".
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An archaeology of materials : Substantial transformations in early prehistoric Europe. New York : Routledge, 2011.

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Phase transitions in ferroelastic and co-elastic crystals : An introduction for mineralogists, material scientists, and physicists. Cambridge [England] : Cambridge University Press, 1990.

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Salje, Ekhard K. H. Phase transitions in ferroelastic and co-elastic crystals : An introduction for mineralogists, material scientists, and physicists. Cambridge [England] : Cambridge University Press, 1993.

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Chapitres de livres sur le sujet "Material Transformations"

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Bäuerle, Dieter. « Material Transformations, Laser Cleaning ». Dans Laser Processing and Chemistry, 535–59. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17613-5_23.

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Bowen, John R. « Material transformations in Catholicism ». Dans Religions in Practice, 88–102. Seventh edition. | Milton Park, Abingdon, Oxon ; New York, NY : Routledge, [2017] : Routledge, 2017. http://dx.doi.org/10.4324/9781315411095-6.

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Cohen, Ralph, et John L. Rowlett. « Ballad, Texts, Tunes, Material Culture ». Dans Transformations of a Genre, 33–47. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89668-3_3.

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Indeitsev, D. A., B. N. Semenov, D. Yu Skubov et D. S. Vavilov. « Structural Transformations of Material Under Dynamic Loading ». Dans Advanced Structured Materials, 185–95. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73694-5_11.

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Blum, Martin. « Club Cola and Co. : Ostalgie, Material Culture and Identity ». Dans Transformations of the New Germany, 131–54. New York : Palgrave Macmillan US, 2006. http://dx.doi.org/10.1057/9781403984661_8.

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Ciula, Arianna, Øyvind Eide, Cristina Marras et Patrick Sahle. « Modelling as Media Transformations ». Dans Modelling Between Digital and Humanities, 95–130. Cambridge, UK : Open Book Publishers, 2023. http://dx.doi.org/10.11647/obp.0369.04.

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Chapter 4, Modelling as media transformation, dwells on the tangible physical forms of models as material and mediated media products expressed and shared in human communication. The forms models take are discussed in terms of configurations of media modalities. This intermedia studies approach, whereby modelling is studied as a media transformation process, complements the semiotic perspective of chapter 3 by revisiting some of the previous examples and integrating them with a variety of heterogeneous models, from archaeology and theatre studies to numerical mathematics, and media transformation processes, including formalisations undertaken in DH research.
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Shatilo, Liudmyla, et Robert Hofmann. « Depicting Trypillia : Emergence and Transformation of the Realistic Style ». Dans Perspectives on Socio-environmental Transformations in Ancient Europe, 221–56. Cham : Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-53314-3_8.

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AbstractTransformation processes have not only different scales, significance and aspects. They can also be reflected in social behavior, and thus also in material culture. This chapter examines various categories of objects of non-utilitarian nature with realistically depicted elements. By analysing a Trypillian group of ceramic objects and anthropomorphic figurines from the Middle and Late Neolithic tell Vinča-Belo Brdo, we can show their temporal and spatial change within the transformation of aggregated settlements during the periods with the highest population density. Our analysis of one of the components of material culture shows huge prospects for studying anatomy and different aspects of transformations and their reflections.
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Esteban, Gemma, Geraldine Kann, Veronica Sarbach et Daniela Amandolese. « A Supporting Tool to Design with and for EM&Ts : The Materials Toolkit ». Dans Materialising the Future, 41–64. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-25207-5_3.

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AbstractThe chapter gives an exhaustive description of the so-called EM&Ts toolkit, a collection of tangible samples displaying emerging materials and technologies and containing five samples for each EM&Ts. Aim of the EM&Ts transfer toolkit is to provide a tool to facilitate the understanding and application potentials of emerging materials and technologies. Every material example has its box, containing: (1) Physical sample, (2) An “Understanding” card: it provides basic knowledge about the material and the manufacturer, Technology Readiness Level, crucial characteristics, and features. The sensorial qualities and performance, sustainability, and smart properties are listed for a clearer understanding of the materials potential; (3) A “Shaping” card: it contains information about the manufacturing process, the form in which the material is available and possible transformations. This information is useful to understand how the material can be processed for production, finishing, and transformation, to get to the final product. The card highlights, which processes that, have been associated with the material so far; (4) An “Applying” card: it gives information and pictures about the field the material is currently used. The material characteristics are compared with other better-known alternatives. In addition, other potential applications are listed, associated with meaningful case studies. The toolkit was created to be used as an aid in educational contexts with students and during workshops with companies and professionals. It is a powerful tool to provide students with information about the materials and their opportunities and limits, and to inspire them during the concept development. On the other side, it has potentialities to provide decision makers of the company with information about the emerging materials and technologies, their opportunities and limits, and to inspire them for innovation in product development. The chapter describes the continuous iterative process through which the toolkit was created and evaluated. Indeed, the toolkits have been used and tested in the academic context, with more than 100 students of diverse design backgrounds during EM&Ts workshops in Spain, Italy, Denmark, and Finland but also in professional context, during participative workshops with 94 companies, design studios, and professionals.
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Ströhle, Claudius. « Conceptualizing Remittance Affordances : Transformations of a Knife Across Borders ». Dans Remittances as Social Practices and Agents of Change, 275–98. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-030-81504-2_12.

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AbstractResearch on remittances mainly focuses on the nexus of migration and development, economic effects on the places of origin, and motives for remitting. However, little is known about the materiality of remittances. Drawing on a multi-sited ethnography in Stubai Valley (Austria) and Usṃak (Turkey), this chapter introduces the concept of remittance affordances by following the spatial and temporal trajectories of a crucial type of material remittances in the encountered research field, namely knives and tools manufactured by the Stubai cooperative. It examines the transformative effects of migration on the involved actors and the built landscape. I argue that in order to be appropriated in the intended way, the remitted objects depend on certain criteria, such as impact of the transactors’ relations, which are historically accumulated and hierarchically constituted, on the material and biography of the object and the bodily incorporated practices of usage.
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Bolzoni, Magda. « Material Changes, Symbolic Transformations : Commercial Gentrification and Urban Change in Turin, Italy ». Dans Diversity of Urban Inclusivity, 65–81. Singapore : Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8528-7_5.

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Actes de conférences sur le sujet "Material Transformations"

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Steier, Ludmilla. « Insights into material design for solar fuel production ». Dans International Conference on Frontiers in Electrocatalytic Transformations. València : Fundació Scito, 2021. http://dx.doi.org/10.29363/nanoge.interect.2021.026.

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Gallagher, John A., et Christopher S. Lynch. « Field-Driven Phase Transformations in Relaxor Ferroelectric Single Crystals ». Dans ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3279.

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Relaxor ferroelectric single crystals such as PMN-PT and PIN-PMN-PT undergo field driven phase transformations when electrically or mechanically loaded in crystallographic directions that provide a positive driving force for the transformation. The observed behavior in certain compositions is a phase transformation distributed over a range of field levels without a distinct forward or reverse coercive field. This work focuses on the material behavior that is observed when the crystals are loaded sufficiently to drive a partial transformation and then unloaded as might occur when driving a transducer to achieve high power levels. A set of experiments was conducted to characterize the minor hysteresis loops that occur with the partial transformations. Distributed transformations have been modeled using a Gaussian distribution of transformation thresholds. In this work the Gaussian model is extended to include the partial transformations that occur when the field is reversed before the transformation is complete. The resulting minor hysteresis loops produced by the model are in good agreement with the experimental results.
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Park, Sang-In, David W. Rosen, Seung-kyum Choi et Chad E. Duty. « Effective Mechanical Properties of Lattice Material Fabricated by Material Extrusion Additive Manufacturing ». Dans 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/detc2014-34683.

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In this paper, a two-step homogenization method is proposed and implemented for evaluating effective mechanical properties of lattice structured material fabricated by the material extrusion additive manufacturing process. In order to consider the characteristics of the additive manufacturing process in estimation procedures, the levels of scale for homogenization are divided into three stages — the levels of layer deposition, structural element, and lattice structure. The method consists of two transformations among stages. In the first step, the transformation between layer deposition and structural element levels is proposed to find the geometrical and material effective properties of structural elements in the lattice structure. In the second step, the method to estimate effective mechanical properties of lattice material is presented, which uses a unit cell and is based on the discretized homogenization method for periodic structure. The method is implemented for cubic lattice structure and compared to experimental results for validation purposes.
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Lindsay, Marshall, Charlie Veal, Scott Kovaleski, Derek T. Anderson et Stanton R. Price. « Artificial intelligence supported material design for tailored image transformations ». Dans Infrared Imaging Systems : Design, Analysis, Modeling, and Testing XXXI, sous la direction de Gerald C. Holst et David P. Haefner. SPIE, 2020. http://dx.doi.org/10.1117/12.2557939.

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« XML-BASED COURSE MATERIAL TRANSFORMATIONS FOR UBIQUITOUS eLEARNING APPLICATIONS ». Dans International Conference on Knowledge Management and Information Sharing. SciTePress - Science and and Technology Publications, 2009. http://dx.doi.org/10.5220/0002302402880291.

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Nikitin, Grigory. « Virtual Reality As Transformation Of Material Reality ». Dans SCTCMG 2019 - Social and Cultural Transformations in the Context of Modern Globalism. Cognitive-Crcs, 2019. http://dx.doi.org/10.15405/epsbs.2019.12.04.329.

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Kastner, Oliver, et Graeme J. Ackland. « Load-Induced Martensitic Transformations in Pseudo-Elastic Lennard-Jones Crystals ». Dans ASME 2008 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2008. http://dx.doi.org/10.1115/smasis2008-413.

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We present molecular dynamics (MD) simulations of a load-induced martensitic phase transformation in pseudo-elastic Lennard-Jones crystals. The model material exhibits martensitic transformations between cubic and hexagonal lattice structures in 2D which represent austenite and martensite. Under axial loading two martensite variants are favoured out of four generic variants possible with this model. In nucleation-and-growth processes the formation of martensite domains are observed in MD simulations and the reverse process upon unloading. Two possible re-transformation mechanisms are identified, a reversible and a reconstructive type. Reversible re-transformations conserve the reference unit cells, while the reconstructive mechanism involves the generation of dislocation motions which destroy the reference unit cells by slip. Both types re-establish the square lattice. While the reversible type represents the predominant reverse transformation mechanism, the reconstructive type is of special importance because it produces lattice defects, and plastic deformation which change both the evolution of subsequent transformation cycles and the magnitude of the phase transformation load.
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Junker, Philipp, et Klaus Hackl. « On the numerical simulation of material inhomogeneities due to martensitic phase transformations in poly-crystals ». Dans ESOMAT 2009 - 8th European Symposium on Martensitic Transformations. Les Ulis, France : EDP Sciences, 2009. http://dx.doi.org/10.1051/esomat/200903007.

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O’Meara, Nicholas, Simon D. Smith et John A. Francis. « Calibrating Phase Transformation and Grain Growth Models and Measuring Phase Dependent Material Properties for Use in FE Simulations of Welds ». Dans ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45936.

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Computer modelling methods are being used to determine the residual stresses in nuclear reactor pressure vessel welds. It has been found that such models need to simulate the effects of solid state phase transformations. Transformations have an associated transformation strain which can significantly influence the evolution of residual stress. The predicted distribution of phases enables structural simulations to account for the distribution of mechanical properties throughout a weld. Factors such as heating or cooling rate and prior austenite grain size must be considered in order to accurately predict the distribution of phases during a transient thermal cycle since they influence transformation kinetics. In this paper, a model to predict the prior austenite grain size and its effects on phase transformation kinetics is presented and calibrated using free dilatometry data. Validation experiments are conducted using a Gleeble thermo-mechanical simulator and are modelled in a commercial FE package to assess the accuracy of a phase transformation model. Samples have been heat treated to possess specific microstructures and have been tested at different temperatures to establish the properties of the phases that can form during weld thermal cycles.
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Tyumentseva, Elena Vladimirovna. « Functioning Of Terms On Material Of Specialized Scientific Texts ». Dans SCTCGM 2018 - Social and Cultural Transformations in the Context of Modern Globalism. Cognitive-Crcs, 2019. http://dx.doi.org/10.15405/epsbs.2019.03.02.275.

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Rapports d'organisations sur le sujet "Material Transformations"

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OSIYANOVA, A., et D. SARKINA. LEXICAL AND GRAMMATICAL TRANSFORMATIONS IN THE SOCIO-POLITICAL TEXTS TRANSLATION (ON THE MATERIAL OF THE US PRESIDENT J. BIDEN’S SPEECHES). Science and Innovation Center Publishing House, 2022. http://dx.doi.org/10.12731/2077-1770-2022-14-2-3-14-22.

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The given article analyzes lexical and grammatical transformations in the translation of socio-political texts in the example of speeches made by the US President Joseph Biden and its Russian translation. A comparative analysis of the original and the translation is presented, which makes it possible to compile statistics on the frequency of use of certain translation transformations.
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Clark, Catherine D. Photochemical Transformations of the Structural and Optical Properties of Marine Colored Dissolved Organic Material in Coastal Waters. Fort Belvoir, VA : Defense Technical Information Center, août 2001. http://dx.doi.org/10.21236/ada627302.

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Belokonova, Nadezhda, Elena Ermishina, Natalya Kataeva, Natalia Naronova et Kristina Golitsyna. E-learning course "Chemistry". SIB-Expertise, janvier 2024. http://dx.doi.org/10.12731/er0770.29012024.

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The electronic training course ""Chemistry"" was created as an auxiliary resource to accompany the chemistry curriculum for the specialties of General Medicine, Pediatrics, and Dentistry. The purpose of studying the course is to form ideas about the structure and transformations of organic and inorganic substances that underlie life processes and influence these processes, in direct connection with the biological functions of these compounds. Course objectives: - formation of knowledge and skills about the basic laws of thermodynamics and bioenergy; about the structure and chemical properties of bioorganic compounds and their derivatives; - formation of knowledge necessary when considering the physical and chemical essence of processes occurring in the human body at the molecular and cellular levels; - developing the ability to carry out, when necessary, calculations of the parameters of these processes, which will allow a deeper understanding of the functions of individual systems of the body and the body as a whole, as well as its interaction with the environment; - training of a specialist who has a sufficient level of knowledge, skills, abilities, and is able to think independently and be interested in research work. The labor intensity of the course is 108 hours. The course consists of 3 didactic units. Each course topic contains theoretical material, a practice test to test your understanding of the theory, and a final test. Each final test on a topic is equivalent to a control event according to a point-rating system. Laboratory work is presented in the form of a video file and a test for it. In this way, an electronic form of completing a report for laboratory work is carried out. The materials presented in the course can be used by teachers as basic when testing students or as additional to those methodological developments that are currently used at the department.
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Ceder, Gerbrand, Nicola Marzari et Vidvuds Ozolins. Thermodynamics and Kinetics of Phase Transformations in Hydrogen Storage Materials. Office of Scientific and Technical Information (OSTI), août 2011. http://dx.doi.org/10.2172/1125004.

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Wang, Chunsheng, et Yujie Zhu. Novel Electro-Analytical Tools for Phase-Transformation Electrode Materials. Fort Belvoir, VA : Defense Technical Information Center, août 2009. http://dx.doi.org/10.21236/ada517245.

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Wolverton, Chris, et Vidvuds Ozolins. Thermodynamics and Kinetics of Phase Transformations in Energy Materials (Final Report). Office of Scientific and Technical Information (OSTI), juin 2019. http://dx.doi.org/10.2172/1526112.

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Barnes, Eftihia, Jennifer Jefcoat, Erik Alberts, Hannah Peel, L. Mimum, J, Buchanan, Xin Guan et al. Synthesis and characterization of biological nanomaterial/poly(vinylidene fluoride) composites. Engineer Research and Development Center (U.S.), septembre 2021. http://dx.doi.org/10.21079/11681/42132.

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The properties of composite materials are strongly influenced by both the physical and chemical properties of their individual constituents, as well as the interactions between them. For nanocomposites, the incorporation of nano-sized dopants inside a host material matrix can lead to significant improvements in mechanical strength, toughness, thermal or electrical conductivity, etc. In this work, the effect of cellulose nanofibrils on the structure and mechanical properties of cellulose nanofibril poly(vinylidene fluoride) (PVDF) composite films was investigated. Cellulose is one of the most abundant organic polymers with superior mechanical properties and readily functionalized surfaces. Under the current processing conditions, cellulose nanofibrils, as-received and 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO) oxidized, alter the crystallinity and mechanical properties of the composite films while not inducing a crystalline phase transformation on the 𝛾 phase PVDF composites. Composite films obtained from hydrated cellulose nanofibrils remain in a majority 𝛾 phase, but also exhibit a small, yet detectable fraction of 𝛼 and ß PVDF phases.
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KOKURINA, OLGA YU. General characteristics, forms and cultural-historical models of development of the Russian state : analytical material. SIB-Expertise, décembre 2023. http://dx.doi.org/10.12731/er0761.20122023.

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Maxwell, R., L. Fried, G. Campbell, A. Saab, J. Kotovsky, C. Carter et J. Chang. Materials and Sensor R&D to Transform the Nuclear Stockpile : Livermore?s Transformational Materials Initiative. Office of Scientific and Technical Information (OSTI), octobre 2009. http://dx.doi.org/10.2172/967280.

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Zhytaryuk, Maryan, et Iryna Ivanova. ANTI-RUSSIAN NARRATIVES OF YURIY SHVETS (ON THE MATERIALS OF HIS AUTHOR’S YOUTUBE CHANNEL). Ivan Franko National University of Lviv, mars 2024. http://dx.doi.org/10.30970/vjo.2024.54-55.12154.

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The article considers the problem of the representation of anti-military narratives in the Internet space, namely in the YouTube channel. The focus is on the anti-military blog of Yuri Shvets (USA). The world, and especially the European media space, has undergone significant changes in the last few years, which are primarily related to innovative technologies and the war raging in Eastern Europe. Such transformations attract research attention, determine the relevance of the presented work. Attention is focused on the anti-military and anti-russian content of the American blogger of Ukrainian origin Yuriy Shvets on the materials of his author’s YouTube channel. The methodological basis of the study. Quantitative and qualitative comparison of the thematic sections of the research object – Yuriy Shvets’ YouTube blogging for the purpose of implementing the research subject – journalistic, (geo)political, conceptual analysis and generalization of the blogger’s anti-imperial and anti-military narratives. The issue of Ukraine’s victory and russia’s defeat is the most pressing issue for Ukraine’s true allies and partners. The purpose of this article is to show the pro-Ukrainian position of the American blogger Y. Shvets in his long verbal struggle with the putin regime based on anti-russian blogging during russia’s full-scale war in Ukraine. The analysis of Yuriy Shvets’ YouTube channel shows the technological possibilities of the latest media platforms, the transformation and convergence of traditional mass media. Social networks, messengers and YouTube will continue to grow in audience and influence. Keywords: Ukraine, russian federation, russia’s aggression against Ukraine, anti-russian narratives, Yuryy Shvets’ YouTube channel, blogging, review of American media, US aid, geopolitics.
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