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Добірка наукової літератури з теми "Deformation Field"

Автор: Grafiati

Опубліковано: 11 березня 2023

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Статті в журналах з теми "Deformation Field"

YAMAGUCHI, MASAHIRO. "GAUGE DEFORMATIONS OF CONFORMAL FIELD THEORIES AND ZAMOLODCHIKOV'S C-FUNCTION." International Journal of Modern Physics A 05, no. 22 (November 20, 1990): 4279–300. http://dx.doi.org/10.1142/s0217751x90001781.

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We study the deformations of conformal field theories in which the perturbing fields include the Virasoro secondary fields of the form L−1φ. We introduce the notion of gauge deformation which is an analogue of the off-shell gauge transformation in string theory. We also calculate Zamolodchikov's c-function and show that it is invariant under the gauge deformation.

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TRINCHERO, R. "SCALAR FIELD ON NON-INTEGER-DIMENSIONAL SPACES." International Journal of Geometric Methods in Modern Physics 09, no. 08 (October 29, 2012): 1250070. http://dx.doi.org/10.1142/s0219887812500703.

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Deformations of the canonical spectral triples over the n-dimensional torus are considered. These deformations have a discrete dimension spectrum consisting of non-integer values less than n. The differential algebra corresponding to these spectral triples is studied. No junk forms appear for non-vanishing deformation parameter. The action of a scalar field in these spaces is considered, leading to non-trivial extra structure compared to the integer-dimensional cases, which does not involve a loss of covariance. One-loop contributions are computed leading to finite results for non-vanishing deformation.

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Fan, Jinyan, Zhibiao Guo, Xiaobing Qiao, Zhigang Tao, Fengnian Wang, and Chunshun Zhang. "Constant Resistance and Yielding Support Technology for Large Deformations of Surrounding Rocks in the Minxian Tunnel." Advances in Civil Engineering 2020 (September 28, 2020): 1–13. http://dx.doi.org/10.1155/2020/8850686.

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During the excavation of the Minxian tunnel, problems of large deformations of surrounding rocks and failure of support structures appeared frequently, which caused serious influences on construction safety and costs of the tunnel. Based on laboratory analysis of mineral composition and field investigations on deformation characteristics of the surrounding rocks, the large deformation mechanism of surrounding rocks of the tunnel was considered as water-absorbing swelling molecules of carbonaceous slate and stress-induced asymmetric structural deformations of the surrounding rocks. The structural deformations of surrounding rocks mainly include bending deformation, interlayer sliding, and crushing failure of local rock blocks. Then, a new constant resistance and yielding support technology based on the constant resistance and large deformation (CRLD) anchor cable was proposed to control large deformations of surrounding rocks. The field tests and deformation monitoring were carried out. The monitoring results showed that compared with original support measure, the surrounding rock deformations, stresses of primary supports, and permanent lining using new support technology decreased greatly. Among them, the maximum deformation of surrounding rock was only 73 mm. The effects of field application and results of deformation monitoring showed that the new support technology can effectively control large deformations of the surrounding rocks in the Minxian tunnel.

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IBRAGIMOV, Kudaibergen, Darkhan ARTYKBAEV, Kanat BAIBOLOV, and Kamol NAZAROV. "Field Deformation Stamp Experiments." Trudy Universiteta, no. 3 (2021): 166–71. http://dx.doi.org/10.52209/1609-1825_2021_3_166.

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Hallberg, Håkan, and Kevin Hult Blixt. "Evaluation of Nanoscale Deformation Fields from Phase Field Crystal Simulations." Metals 12, no. 10 (September 28, 2022): 1630. http://dx.doi.org/10.3390/met12101630.

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Different methods for evaluation of displacement and strain fields based on phase field crystal (PFC) simulations are shown. Methods originally devised for molecular dynamics (MD) simulations or analysis of high-resolution microscopy images are adapted to a PFC setting, providing access to displacement and strain fields for systems of discrete atoms, such as in MD, as well as to continuous deformation fields. The latter being achieved by geometrical phase analysis. As part of the study, the application of prescribed non-affine deformations in a 3D structural PFC (XPFC) setting is demonstrated as well as an efficient numerical scheme for evaluation of PFC phase diagrams, such as, for example, those required to stabilize solid/liquid coexistence. The present study provides an expanded toolbox for using PFC simulations as a versatile numerical method in the analysis of material behavior at the atomic scale.

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Ligas, Marcin, Marek Banaś, and Anna Szafarczyk. "A method for local approximation of a planar deformation field." Reports on Geodesy and Geoinformatics 108, no. 1 (October 10, 2019): 1–8. http://dx.doi.org/10.2478/rgg-2019-0007.

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AbstractWe present a method of approximation of a deformation field based on the local affine transformations constructed based on n nearest neighbors with respect to points of adopted grid. The local affine transformations are weighted by means of inverse distance squared between each grid point and observed points (nearest neighbors). This work uses a deformation gradient, although it is possible to use a displacement gradient instead – the two approaches are equivalent. To decompose the deformation gradient into components related to rigid motions (rotations, translations are excluded from the deformation gradient through differentiation process) and deformations, we used a polar decomposition and decomposition into a sum of symmetric and an anti-symmetric matrices (tensors). We discuss the results from both decompositions. Calibration of a local affine transformations model (i.e., number of nearest neighbors) is performed on observed points and is carried out in a cross-validation procedure. Verification of the method was conducted on simulated data-grids subjected to known (functionally generated) deformations, hence, known in every point of a study area.

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Bushenkova, Natalia A., and Olga A. Kuchay. "SEISMOTECTONIC DEFORMATIONS IN THE PACIFIC AND OKHOTSK LITHOSPHERIC PLATES CONTACT ZONE." Interexpo GEO-Siberia 2, no. 2 (May 21, 2021): 9–16. http://dx.doi.org/10.33764/2618-981x-2021-2-2-9-16.

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The seismotectonic deformations were determined in the Pacific and Okhotsk (Eurasian) lithospheric plates subduction zone based on 2458 mechanisms of earthquake foci data for 1977-2019. The deformation features of medium in different deep layers are shown. The deformation field uniformity in the depth range of 1-70 km and the deformation field inhomogeneity for the submerged plate deep parts (105-200, 200-400 and 400-700 km) are revealed. One of the deformations field change reasons is the influence of ascending and, especially, descending currents of thermogravitational convection in the upper mantle sublithospheric part, in particular, the convection structure influence on the subducting plate geometry

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Perez-Payan, Sinuhe, M. Sabido, E. Mena, and C. Yee-Romero. "Analysis of Scalar Field Cosmology with Phase Space Deformations." Advances in High Energy Physics 2014 (2014): 1–5. http://dx.doi.org/10.1155/2014/958137.

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Phase space deformations on scalar field cosmology are studied. The deformation is introduced by modifying the symplectic structure of the minisuperspace variables. The effects of the deformation are studied in the “C-frame” and the “NC-frame.” In order to remove the ambiguities of working on different frames, a new principle is introduced. When we impose that both frames should be physically equivalent, we conclude that the only possibility for this model, is to have an effective cosmological constantΛeff≥0. Finally we bound the parameter space forθandβ.

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KRIZ, IGOR. "PERTURBATIVE DEFORMATIONS OF CONFORMAL FIELD THEORIES REVISITED." Reviews in Mathematical Physics 22, no. 02 (March 2010): 117–92. http://dx.doi.org/10.1142/s0129055x10003916.

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The purpose of this paper is to revisit the theory of perturbative deformations of conformal field theory from a mathematically rigorous, purely worldsheet point of view. We specifically include the case of N = (2,2) conformal field theories. From this point of view, we find certain surprising obstructions, which appear to indicate that contrary to previous findings, not all deformations along marginal fields exist perturbatively. This includes the case of deformation of the Gepner model of the Fermat quintic along certain cc fields. In other cases, including Gepner models of K3-surfaces and the free field theory, our results coincides with known predictions. We give partial interpretation of our results via renormalization and mirror symmetry.

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Barkov, L. A., Marina N. Samodurova, and O. A. Nevraeva. "Kinematic and Dynamic Conditions in Metal Rolling of Porous Materials." Materials Science Forum 989 (May 2020): 705–10. http://dx.doi.org/10.4028/www.scientific.net/msf.989.705.

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Mathematical modeling of plastic deformations in rolling consists in a consequent combination of the general energetic relationship in plasticity and the variation inequality expressed the principle of minimum of entire deformation energy. A real deformation state in a plastic zone beneath rolls and corresponding kinematic and dynamics conditions on the contact surface are considered as a limited one for the consequent approximate deformation states and are found out by the method of approximated approach. Any realization of this method on personal computers requires a rational construction of a kinematic-possible velocity field in the spatial domain on plastic flow. Using the ordinary propositions and a new assumptions the authors have constructed a simple kinematic-possible velocity field in the plastic zone beneath rolls. On the base of the consequent approach in which the general energetic relationship and the variation inequality are interrelated the authors have been able to find out the geometric, kinematic and dynamics characteristics of plastic deformation’s states in metal rolling.

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Дисертації з теми "Deformation Field"

Crawford, Adrian C. "The deformation of channel sand bodies." Thesis, University of Reading, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326973.

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CILONA, ANTONINO. "Deformation processes in porous carbonates: field and laboratory observations." Doctoral thesis, Università degli Studi di Camerino, 2012. http://hdl.handle.net/11581/401795.

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Pope, Dan J. "Response prediction of plate-reinforced concrete panels exposed to near field blast." Thesis, University of Sheffield, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269322.

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Yamaguchi, Masashi. "Phase-field simulation of dendritic growth under externally applied deformation." Diss., University of Iowa, 2011. https://ir.uiowa.edu/etd/2792.

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Defects, i.e. hot tears, macrosegragation, and pores, formed in metal castings are a result of stresses and strains in the solid-liquid mushy zone. Numerical simulation of solidification of deforming dendrite crystal promises to improve insight into the mechanical behavior of mushy zones under an applied load. The primary goal of this thesis is to develop numerical methodologies for performing solidification simulation of deforming dendrites. Such simulation encounters difficulties associated with the interface dynamics due to phase change or interaction among the dendrites, and large visco-plastic deformation applied to them. Phase-field simulation of dendritic solidification is promising for the treatment of the complex interface dynamics. Free energy based formulation allows the model to incorporate bridging and wetting phenomena occurring at grain boundaries through an extra energy term which arises from a mismatch of the crystallographic orientation. The particle method would be attractive to handle large inelastic deformation without suffering mesh entanglement. In order to investigate the effect of solid deformations on the evolving microstructure, the material point method with elasto-visco-plasticity constitutive model is developed to couple to a phase-field model of solidification. The changes in the crystallographic orientation of a growing dendrite crystal due to solid deformation are carefully accounted for through the coupling methodology. The developed numerical framework is applicable to the simulation for single and multiple crystals, and is capable of handling complex morphological change. The wide variety of validations and practical problems solved in this thesis demonstrates the capability of investigating deformation behavior of growing crystals.

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Agrawal, Chandra Prakash. "Full-field deformation measurement in wood using digital image processing." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/43078.

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A digital image processing system was used to non-destructively measure the full-field deformation on aluminum and wood specimens loaded in compression and bending. The measurement technique consisted of creating a random speckle pattern on the specimen surface, recording images before deformation and after deformation, and computing the relative displacements of small image subsets. Two methods for producing speckle patterns on the specimens were studied: spray paint and adhesive-backed photographic film.

Baseline tests were conducted to evaluate the influence of signal noise on the measurement system. Uniform translation tests were conducted to evaluate the capability of the system for measuring finite motion. the technique was used to monitor the full-field deformation response of aluminum and wood specimens tested in bending and static compression. Moderate duration compression creep tests were conducted, on the wood specimens to investigate the suitability of the system for monitoring the creep response of materials. The results obtained from the two speckle techniques were also. compared. The results showed that for the magnification and speckle patterns tested displacement measurements smaller than 3.29x10-4 inch may be unreliable due to signal noise.

Master of Science

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Edwards, Alexander P. "An experimental and field study of ductile deformation in clastic rocks." Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.506862.

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Naturally deformed clastic rocks such as breccias and conglomerates provide a useful way to study strain and, indh:ectly, the rheology of rocks. However plastic deformation processes may potentially compromise many of the commonly used methods of determining strain in such rocks at high temperatures, since many of these strain analysis techniques rely upon changes in object e.g. grain shape, orientation and distribution. The work reported in this. thesis explores this matter quantitatively by performing a number of deformation experiments on synthetic calcite 'conglomerates' at temperatures where the rate-dependence of grain size-sensitive deformation processes in the clast and matrix can beú varied. In order to control the microstructures of the experimental samples, specimens were fabricated by mixing granulated Solnhofen limestone with powders of Chelometric grade calcite. The mixtures were tumbled for 3 hours duration to ensure uniform intermixing of the powders, and were then hot-isostatically pressed at a temperature of 700úC under a confining pressure of 190 MPa for 72 hours. The resulting samples were fully dense and consisted of sub-angular Solnhofen limestone clasts 60-90J.Ull in diameter, in a foam-textured matrix of Chelometric grade calcite with a grain size of22.2J.Ull ñ7.5J.Ull. All experiments were conducted at temperatures ranging between 400ú -700úC, and at a constant confining pressure (158 MPa) and strain rate (3.0xlO-4 S-I). An initial set of deformation experiments were performed upon pure Solnhofen limestone and Chelometric grade calcite to establish the flow behaviour of the clasts and matrix, respectively. Subsequent experiments were performed upon samples in which the volume fraction of clasts and matrix varied in the range 9:91 to 37:63. In order to assess the accuracy of strain measurements made on deformed conglomerates and, in particular, the potential complicating influence of grain size-sensitive flow on those measurements, the Rf/J and Fry techniques have been used to determine the clast and matrix strains, respectively, in the experimental samples. Detailed microstructural analyses were performed using an automated Electron Backscatter Diffraction (EBSD) technique. The experimental results obtained emphasize the significant role that viscosity contrasts, volume fraction and microstructure have in controlling the bulk strengths of polyphase materials. The results also show that at 550úC there is no strain partitioning between the clast and matrix despite the large viscosity contrast between them whereas at 700úC there is a small but consistent strain partitioning. A rigorous interrogation of the results using the law of mixtures has shown that the component of strain which is accommodated by grain boundary sliding can be quantified in these experiments. Microstructural analysis has shown clearly a temperature dependent change in the development of fabric intensity with strain which may provide a new insight into inferring true bulk strains in rocks deformed at high temperatures.

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Morachkovsky, Oleg K., and D. V. Lavinsky. "The Nonlinear Deformation of the Body System Under Electromagnetic Field Action." Thesis, NTU "KhPI", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/23684.

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The paper discusses issues concerning the deformation of a system of conductive bodies under the action of the electromagnetic field. Problem of nonlinear deformation of technological system for electromagnetic forming is considered as a practical application. The problem is solved by the finite element method. Spatial-temporal distributions of the main components of the electromagnetic field are obtained. The ability to review the problem of deformation in the quasi-stationary formulation is justified. The distribution of the main component of the stress-strain state is presented. The influence of the current magnitude at the maximum stresses is evaluated.

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Hollenstein, Christine. "GPS deformation field and geodynamic implications for the Hellenic plate boundary region /." Zürich : ETH, 2006. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=16593.

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Cox, I. D. "Deformation of free surface in magnetohydrodynamic flows in a strong magnetic field." Thesis, Coventry University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492361.

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Thermocapillary motion is considered in an electrically conducting fluid with a free and open surface, and in the presence of a strong vertical magnetic field. The motion is considered initially without specifying the geometry of the fluid. Any walls are electrically insulating. Applications are discussed, for situations such as crystal growth, where thermocapillary motion affects the distribution of dopants, or the use of liquid metal in fusion reactors, where heat and magnetic field are both very large causing potentially significant thermocapillary motions. An inertialess approximation is made, and the characteristic velocity of the fluid is selected so that the surface tension forces governing the thermocapillary motion are as significant as the Lorentz force. Asymptotic solutions are obtained for high values of the Hartmann Number Ha in both the two dimensional and three dimensional cases. The equation of the free surface is found for two dimensional flow in a cavity for various arbitrary temperature distributions. This and the pressure within the fluid is found to be dependent on the dynamic boundary conditions at the surface. The equations governing the free surface of a rivulet flowing in a strong vertical magnetic . field are similar to those obtained using the lubrication approximation for the rivulet where there is no magnetic field. . In the three dimensional case the fluid velocity in the core may be an order higher in Ha than in the two dimensional case. This higher velocity is induced by a ,(relatively) large electric potential, and is two dimensional horizontal flow following .the Contours of the free surface, superimposed on a slower three dimensional flow. 'fhelatter flow returns the fluid back to the free surface to supply the thermocapillary motion The condition for the higher order flow is that vertical cnrrent flow in the core is non-zero, and that this current flow enters and leaves the Hartmann layer that is adjacent to the fluid surface. Jf the heating is synuuetric in the two horizontal coordinate directions, the Hartmann layer is passive, and the vertical current is zero. Flow in the core is slow, and there is a radial flow to supply the thermocapillory motion at the free surface. Electric current lines are in concentric horizontal circles.

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Hodge, Kirsten FitzGerald. "Field and experimental constraints on the deformation and breakup of injected magma." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/42849.

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Understanding the growth and differentiation of silicic magma chambers is a central issue in volcanology. Specifically, the injection, deformation and breakup of new pulses of magma can influence how the chamber evolves thermally and chemically, as well as the potential for eruption. Magmatic structures (e.g. enclaves, ladder dikes, and schlieren) preserved in plutonic and volcanic rocks record information about the physical processes that occur within the chamber prior to solidification. A key outstanding issue is how to use magmatic structures to extract information about magma rheology and host chamber dynamics within the chamber and during magma ascent--processes that are inherently inaccessible to direct observation. This thesis is an attempt to elucidate the fundamental physics that governs the breakup of an injected magma into a preexisting chamber. One major obstacle for the popular model that mafic inputs trigger big eruptions (Pallister et al., 1992, Murphy et al., 1998) and govern the long-term growth of silicic chambers is the way the new magma is injected. In particular, the scale length at which thermal and compositional heterogeneity is introduced controls how efficiently heat is transferred and the extent to which chamber convection causes mixing. This thesis provides a new understanding of how injections breakup to such small sizes, which can lead to a greater efficiency for mixing and remobilization of an otherwise immobile magma. I use field and experimental studies to investigate specific magmatic features preserved in plutonic and volcanic rocks that can be used to constrain the magma rheology within the chamber at the time of deformation. First, I use experiments and scaling theory to investigate the mechanical and rheological conditions leading to the deformation and breakup of analog crystal-rich dikes. Second, I use field observations of ``ladder dikes'' from the Tuolumne Intrusive Suite, together with experiments and scaling theory to demonstrate that prior to solidification, these features are deformed and broken by shearing motions in the magma chamber. And third, using experimental results along with thermodynamic and modeling constraints on key physical properties of the injected and host magmas, I use size distributions of enclaves preserved in lava flows to characterize the flow regime governing enclave formation.

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Книги з теми "Deformation Field"

Teng-fong, Wong, ed. Experimental rock deformation--the brittle field. 2nd ed. Berlin: Springer, 2005.

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Paterson, Mervyn S. Experimental rock deformation: The brittle field. 2nd ed. Berlin: Springer, 2004.

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Moshayedi, Nima. Kontsevich’s Deformation Quantization and Quantum Field Theory. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-05122-7.

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Pierron, Fabrice. The Virtual Fields Method: Extracting Constitutive Mechanical Parameters from Full-field Deformation Measurements. Boston, MA: Springer US, 2012.

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Beus, Michael J. Application of field measurements and computer modeling to evaluate deep mine shaft stability in northern Idaho. [Washington, D.C.?]: U.S. Dept. of the Interior, Bureau of Mines, 1996.

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J, Beus Michael, ed. Real-time monitoring of field measurements for mine design: Greens Creek Mine, Admiralty Island, Alaska. [Washington, D.C.?]: U.S. Dept. of the Interior, Bureau of Mines, 1996.

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J, Beus Michael, ed. Real-time monitoring of field measurements for mine design: Greens Creek Mine, Admiralty Island, Alaska. [Washington, D.C.?]: U.S. Dept. of the Interior, Bureau of Mines, 1996.

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J, Beus Michael, ed. Real-time monitoring of field measurements for mine design: Greens Creek Mine, Admiralty Island, Alaska. [Washington, D.C.?]: U.S. Dept. of the Interior, Bureau of Mines, 1996.

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J, Beus Michael, ed. Real-time monitoring of field measurements for mine design: Greens Creek Mine, Admiralty Island, Alaska. [Washington, D.C.?]: U.S. Dept. of the Interior, Bureau of Mines, 1996.

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J, Beus Michael, ed. Real-time monitoring of field measurements for mine design: Greens Creek Mine, Admiralty Island, Alaska. [Washington, D.C.?]: U.S. Dept. of the Interior, Bureau of Mines, 1996.

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Частини книг з теми "Deformation Field"

Rejzner, Kasia. "Deformation Quantization." In Perturbative Algebraic Quantum Field Theory, 83–93. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-25901-7_5.

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Moshayedi, Nima. "Deformation Quantization." In Kontsevich’s Deformation Quantization and Quantum Field Theory, 165–232. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-05122-7_5.

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Paugam, Frédéric. "Topological Deformation Quantizations." In Towards the Mathematics of Quantum Field Theory, 443–48. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04564-1_23.

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Aboudi, Jacob, and Marek-Jerzy Pindera. "Matrix Mean-Field and Local-Field Approaches in the Analysis of Metal Matrix Composites." In Inelastic Deformation of Composite Materials, 761–79. New York, NY: Springer New York, 1991. http://dx.doi.org/10.1007/978-1-4613-9109-8_38.

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Choukroune, P. "Strain and Displacement in the Brittle Field." In Paleomagnetic Rotations and Continental Deformation, 165–80. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0869-7_12.

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Waldmann, Stefan. "Noncommutative Field Theories from a Deformation Point of View." In Quantum Field Theory, 117–35. Basel: Birkhäuser Basel, 2009. http://dx.doi.org/10.1007/978-3-7643-8736-5_7.

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Arnod, S., M. Battaglio, N. Bellomo, D. Costanzo, R. Lancellotta, and L. Preziosi. "Finite Deformation Models and Field Performance." In Porous Media: Theory and Experiments, 17–27. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4579-4_2.

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Yoshida, Sanichiro. "Field Theory of Deformation and Fracture." In Deformation and Fracture of Solid-State Materials, 61–89. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4939-2098-3_4.

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Yoshida, Sanichiro. "Quick Review of Field Theories." In Deformation and Fracture of Solid-State Materials, 37–60. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4939-2098-3_3.

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Tang, Yiqun, Jie Zhou, Xingwei Ren, and Qi Yang. "Field Tests." In Dynamic Response and Deformation Characteristic of Saturated Soft Clay under Subway Vehicle Loading, 25–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-41987-4_2.

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Тези доповідей конференцій з теми "Deformation Field"

Karacali, Bilge. "Deformation field interpolation using rotational landmarks." In 2010 15th National Biomedical Engineering Meeting (BIYOMUT 2010). IEEE, 2010. http://dx.doi.org/10.1109/biyomut.2010.5479857.

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Ramdhani, B. D., I. Meilano, and D. A. Sarsito. "Deformation study of Kamojang geothermal field." In INTERNATIONAL SYMPOSIUM ON EARTH HAZARD AND DISASTER MITIGATION (ISEDM) 2016: The 6th Annual Symposium on Earthquake and Related Geohazard Research for Disaster Risk Reduction. Author(s), 2017. http://dx.doi.org/10.1063/1.4987074.

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Chaplya, Pavel M., Geoffrey P. McKnight, and Gregory P. Carman. "Mechanical Deformation of Field-Coupled Materials." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39009.

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This article describes remarkable similarities in the nonlinear mechanical response of different active/smart materials despite fundamental differences in the underlying mechanisms associated with each material. Active/smart materials (i.e., piezoelectric (PZT-5H), magnetostrictive (Terfenol-D), and shape memory alloys (NiTi)) exhibit strong non-linear mechanical behavior produced by changing non-mechanical internal states such as polarization, magnetization, and phase/twin configuration. In active/smart materials the initial deformation proceeds linearly followed by a jump in strain associated with the transformation of an internal non-mechanical state. After the transformation, the mechanical response returns to linear elastic. Upon unloading, a residual strain is observed which can be recovered with the application of a corresponding external field (i.e., electric, magnetic, or thermal). Due to coupling between applied fields and non-mechanical internal states, mechanical deformation is also a function of applied external fields. At a critical applied field, the residual strain is eliminated, providing repeatable cyclic characteristics that can be used in passive damping applications. Even though different intrinsic processes (i.e., polarization, magnetization, and phase/twin variant composition) govern the deformation of each material, their macroscopic behavior is explained using a unified volume fraction concept. That is, the deformation of piezoelectric material is described in terms of the volume fraction of ferroelectric domains with polarization parallel or orthogonal to the applied load; the deformation of magnetostrictive materials is described in terms of the volume fraction of magnetic domains with magnetization parallel or orthogonal to the applied load; and the deformation of shape memory material is described in terms of the volume fraction of twin variants that are oriented favorably to the applied load. Although the qualitative behavior of each material is similar, the average magnitude of stress required to induce non-linearity varies from ~10 MPa for Terfenol-D to ~65 MPa for PZT-5H to ~300 MPa for NiTi shape memory alloy. It is hypothesized that a composite material made of these materials connected in series would exhibit passive damping over a wide range of applied stress.

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GRAVES, WILLIAM, and DAVID LATTANZI. "FULL-SCALE DEFORMATION FIELD MEASUREMENTS VIA PHOTOGRAMMETRIC REMOTE SENSING." In Structural Health Monitoring 2021. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/shm2021/36298.

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3D remote sensing technologies have improved dramatically over the past five years and methods such as laser scanning and photogrammetry are now capable of reliably resolving geometric details on the order of one millimeter or less. This has significant impacts for the structural health monitoring community, as it has expanded the range of mechanics-driven problems that these methods can be employed on. In this work, we explore how 3D geometric measurements extracted from photogrammetric point clouds can be leveraged for structural analysis and measurement of structural deformations without physically contacting the target structure. Here we present a non-destructive evaluation technique for extracting and quantifying structural deformations as applied to a load test on a highway bridge in Delaware. The challenging nature of 3D point cloud data means that statistical methods must be employed to adequately evaluate the deformation field of the bridge. Overall, the results show a direct pathway from 3D imaging to fundamental mechanical analysis with measurements that capture the true deformation values typically within one standard deviation. These results are promising given that the mid-span deformation of the bridge for the given load test is on the scale of only a few millimeters. Future work for this method will also investigate using these results for updating finite element models.

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Murthy, Tejas G., Ebenezer P. Gnanamanickam, Christopher Saldana, Srinivasan Chandrasekar, Masami Nakagawa, and Stefan Luding. "Deformation Field in Indentation of Granular Materials." In POWDERS AND GRAINS 2009: PROCEEDINGS OF THE 6TH INTERNATIONAL CONFERENCE ON MICROMECHANICS OF GRANULAR MEDIA. AIP, 2009. http://dx.doi.org/10.1063/1.3179909.

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Yue, Kaiduan, Mei Yuan, Yaxing Yi, Zhongke Li, Fei Zhang, and Longfei Jian. "Research of full-field deformation measurement system." In International Conference on Optical Instrumentation and Technology, edited by Shenghua Ye, Guangjun Zhang, and Jun Ni. SPIE, 2009. http://dx.doi.org/10.1117/12.837776.

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Bazeia, D., L. Losano, and J. R. L. Santos. "The deformation method and the Bäcklund Transformations." In THE SIXTH INTERNATIONAL SCHOOL ON FIELD THEORY AND GRAVITATION-2012. AIP, 2012. http://dx.doi.org/10.1063/1.4756978.

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Gil, Antonio J., M. Jesús Borque, Manuel Avilés, M. Clara De Lacy, Jesús Galindo‐Zaldívar, Pedro Alfaro, F. J. García‐Tortosa, et al. "Crustal velocity field in Baza and Galera faults: A new estimation from GPS position time series in 2009 - 2018 time span." In 5th Joint International Symposium on Deformation Monitoring. Valencia: Editorial de la Universitat Politècnica de València, 2022. http://dx.doi.org/10.4995/jisdm2022.2022.13772.

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The Baza and Galera faults are two active geologic structures located in the central area of the Betic Cordillera (Southern Spain). The goal of our research is to constrain the activity of this faults from high quality GPS measurements to obtain precise deformation rates. In 2008 a GPS survey – mode network was installed to monitor this area. In previous works, we presented a velocity field based on the analysis of some GPS campaigns. Here we show the new results computed from nine GPS campaigns in the timespan 2009-2018. The measurements were done in September 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2017 and 2018. The data process and analysis were performed in Precise Point Positioning by using GIPSYX 1.6 software. GIPSY is a GNSS-inferred positioning software developed by the Jet Propulsion Laboratory. Then, the new estimation of the crustal velocity ﬁeld is computed from the IGb14 time series by SARI software. The model applied to the original time series, using weighted least squares, consists of an intercept, a site rate and an offset to account for an antenna change. The error term is composed of white noise and temporally correlated random error. The colored noise is described by a random-walk process. We have assumed a typical magnitude for this process of 1.0 mm/√yr. Finally, we discuss the implications of the new results for the tectonic setting and seismic hazard assessment of this key tectonic area of the Betic Cordillera.

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Karlstrom, Karl E., S. M. Cather, M. T. Heizler, F. J. Pazzaglia, and M. Roy. "Sandia Mountains and Rio Grande rift: Ancestry of structures and history of deformation." In 50th Annual Fall Field Conference. New Mexico Geological Society, 1999. http://dx.doi.org/10.56577/ffc-50.155.

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van Haren, Richard J. F., Ronald Otten, Subodh Singh, Amandev Singh, Leon van Dijk, David Owen, Doug Anberg, Jeffrey Mileham, Yajun Gu, and Jan Hermans. "Intra-field stress impact on global wafer deformation." In Metrology, Inspection, and Process Control for Microlithography XXXIII, edited by Ofer Adan and Vladimir A. Ukraintsev. SPIE, 2019. http://dx.doi.org/10.1117/12.2515391.

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Звіти організацій з теми "Deformation Field"

Jin, Huiqing, and Wei-Yang Lu. 3D deformation field throughout the interior of materials. Office of Scientific and Technical Information (OSTI), September 2013. http://dx.doi.org/10.2172/1096458.

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Hirshfeld, Allen. Deformation Quantization in Quantum Mechanics and Quantum Field Theory. GIQ, 2012. http://dx.doi.org/10.7546/giq-4-2003-11-41.

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Espinosa, Horacio D. Instrumentation for Full Field Deformation Measurement with Nano-Second Resolution. Fort Belvoir, VA: Defense Technical Information Center, November 1998. http://dx.doi.org/10.21236/ada367428.

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Culp, David, Nathan Miller, and Laura Schweizer. Application of Phase-Field Techniques to Hydraulically- and Deformation-Induced Fracture. Office of Scientific and Technical Information (OSTI), August 2017. http://dx.doi.org/10.2172/1378175.

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Kramer, Sharlotte Lorraine Bolyard, and William M. Scherzinger. Implementation and Evaluation of the Virtual Fields Method: Determining Constitutive Model Parameters From Full-Field Deformation Data. Office of Scientific and Technical Information (OSTI), September 2014. http://dx.doi.org/10.2172/1158669.

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An, Yonghao, B. C. Wood, M. Tang, and H. Jiang. Phase-field Model for Stress-dependent Ginsburg-Landau Kinetics for Large Deformation of Silicon Anodes. Office of Scientific and Technical Information (OSTI), October 2014. http://dx.doi.org/10.2172/1172293.

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Mason, J. J., A. J. Rosakis, and G. Ravichandran. Full Field Measurements of the Dynamic Deformation Field Around a Growing Adiabatic Shear Band at the Tip of a Dynamically Loaded Crack or Notch. Fort Belvoir, VA: Defense Technical Information Center, January 1993. http://dx.doi.org/10.21236/ada279791.

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Riley, Mark, and Akis Pipidis. The Mechanical Analogue of the "Backbending" Phenomenon in Nuclear-structure Physics. Florida State University, May 2008. http://dx.doi.org/10.33009/fsu_physics-backbending.

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This short pedagogical movie illustrates an effect in nuclear physics called backbending which was first observed in the study of the rotational behavior of rapidly rotating rare-earth nuclei in Stockholm, Sweden in 1971. The video contains a mechanical analog utilizing rare-earth magnets and rotating gyroscopes on a turntable along with some historic spectra and papers associated with this landmark discovery together with its explanation in terms of the Coriolis induced uncoupling and rotational alignment of a specific pair of particles occupying high-j intruder orbitals. Thus backbending represents a crossing in energy of the groundstate, or vacuum, rotational band by another band which has two unpaired high-j nucleons (two quasi-particles) with their individual angular momenta aligned with the rotation axis of the rapidly rotating nucleus. Backbending was a major surprise which pushed the field of nuclear structure physics forward but which is now sufficiently well understood that it can be used as a precision spectroscopic tool providing useful insight for example, into nuclear pairing correlations and changes in the latter due to blocking effects and quasi-particle seniority, nuclear deformation, the excited configurations of particular rotational structures and the placement of proton and neutron intruder orbitals at the Fermi surface.

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Irwin, John, Marina Shmakova, and Jay Anderson. Lensing Signals in the Hubble Ultra-deep Field using all 2nd-order Shape Deformations. Office of Scientific and Technical Information (OSTI), July 2006. http://dx.doi.org/10.2172/887076.

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Chen, Z., S. E. Grasby, C. Deblonde, and X. Liu. AI-enabled remote sensing data interpretation for geothermal resource evaluation as applied to the Mount Meager geothermal prospective area. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/330008.

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The objective of this study is to search for features and indicators from the identified geothermal resource sweet spot in the south Mount Meager area that are applicable to other volcanic complexes in the Garibaldi Volcanic Belt. A Landsat 8 multi-spectral band dataset, for a total of 57 images ranging from visible through infrared to thermal infrared frequency channels and covering different years and seasons, were selected. Specific features that are indicative of high geothermal heat flux, fractured permeable zones, and groundwater circulation, the three key elements in exploring for geothermal resource, were extracted. The thermal infrared images from different seasons show occurrence of high temperature anomalies and their association with volcanic and intrusive bodies, and reveal the variation in location and intensity of the anomalies with time over four seasons, allowing inference of specific heat transform mechanisms. Automatically extracted linear features using AI/ML algorithms developed for computer vision from various frequency bands show various linear segment groups that are likely surface expression associated with local volcanic activities, regional deformation and slope failure. In conjunction with regional structural models and field observations, the anomalies and features from remotely sensed images were interpreted to provide new insights for improving our understanding of the Mount Meager geothermal system and its characteristics. After validation, the methods developed and indicators identified in this study can be applied to other volcanic complexes in the Garibaldi, or other volcanic belts for geothermal resource reconnaissance.

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