Готові списки джерел за темами / Magnetic geometry

Добірка наукової літератури з теми "Magnetic geometry"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 8 червня 2024

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Статті в журналах з теми "Magnetic geometry"

Weiss, Nigel. "Magnetic geometry of sunspots." Nature 362, no. 6417 (March 1993): 208–9. http://dx.doi.org/10.1038/362208a0.

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Cargill, P. J., J. Chen, D. S. Spicer, and S. T. Zalesak. "Geometry of interplanetary magnetic clouds." Geophysical Research Letters 22, no. 5 (March 1, 1995): 647–50. http://dx.doi.org/10.1029/95gl00013.

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Wildman, Raymond A., and George A. Gazonas. "Gravitational and magnetic anomaly inversion using a tree-based geometry representation." GEOPHYSICS 74, no. 3 (May 2009): I23—I35. http://dx.doi.org/10.1190/1.3110042.

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Gravitational and magnetic anomaly inversion of homogeneous 2D and 3D structures is treated using a geometric parameterization that can represent multiple, arbitrary polygons or polyhedra and a local-optimization scheme based on a hill-climbing method. This geometry representation uses a tree data structure, which defines a set of Boolean operations performed on convex polygons. A variable-length list of points, whose convex hull defines a convex polygon operand, resides in each leaf node of the tree. The overall optimization algorithm proceeds in two steps. Step one optimizes geometric transformations performed on different convex polygons. This step provides approximate size and location data. The second step optimizes the points located on all convex hulls simultaneously, giving a more accurate representation of the geometry. Though not an inherent restriction, only the geometry is optimized, not including material values such as density or susceptibility. Results based on synthetic and measured data show that the method accurately reconstructs various structures from gravity and magnetic anomaly data. In addition to purely homogeneous structures, a parabolic density distribution is inverted for 2D inversion.

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Catalano, Francesco A. "Have Non-Magnetic Stars a Complex Geometry?" International Astronomical Union Colloquium 138 (1993): 315–26. http://dx.doi.org/10.1017/s0252921100020686.

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AbstractThe existence of non-magnetic CP stars among the ones in the CP2 and CP4 groups is discussed. Assuming to be non-magnetic a star in which the magnetic field has been measured but no value in excess of the 3σ level has been detected, the implications of the spectrum and/or light variability observed in some such stars are discussed. Since the overall properties of non-magnetic stars do not differ significantly from those of the magnetic ones and a similar variability phenomenology has been observed in several such stars, the probable presence of a weak large scale organized magnetic field is argued.

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Rüdiger, G., and D. A. Shalybkov. "The magnetic geometry of magnetic-dominated thin accretion disks." Astronomy & Astrophysics 393, no. 3 (October 2002): L81—L84. http://dx.doi.org/10.1051/0004-6361:20021254.

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Connor, J. W. "Magnetic geometry, plasma profiles, and stability." Plasma Physics Reports 32, no. 7 (July 2006): 539–48. http://dx.doi.org/10.1134/s1063780x06070026.

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Sergeev, A. G. "Magnetic Bloch theory and noncommutative geometry." Proceedings of the Steklov Institute of Mathematics 279, no. 1 (December 2012): 181–93. http://dx.doi.org/10.1134/s0081543812080123.

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Courtillot, V., J. P. Valet, G. Hulot, and J. L. Le Mouel. "The Earth's magnetic field: Which geometry?" Eos, Transactions American Geophysical Union 73, no. 32 (1992): 337. http://dx.doi.org/10.1029/91eo00260.

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Lizzi, Fedele, and Richard J. Szabo. "Electric-magnetic duality in noncommutative geometry." Physics Letters B 417, no. 3-4 (January 1998): 303–11. http://dx.doi.org/10.1016/s0370-2693(97)01401-9.

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Kazeev, M. N., V. S. Koidan, V. F. Kozlov, and Yu S. Tolstov. "Magnetic pulse welding in plane geometry." Journal of Applied Mechanics and Technical Physics 54, no. 6 (November 2013): 894–99. http://dx.doi.org/10.1134/s0021894413060047.

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Дисертації з теми "Magnetic geometry"

Kemp, Graham. "Algebra and geometry of Dirac's magnetic monopole." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/12508.

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This thesis is concerned with the quantum Dirac magnetic monopole and two classes of its generalisations. The first of these are certain analogues of the Dirac magnetic monopole on coadjoint orbits of compact Lie groups, equipped with the normal metric. The original Dirac magnetic monopole on the unit sphere S^2 corresponds to the particular case of the coadjoint orbits of SU(2). The main idea is that the Hilbert space of the problem, which is the space of L^2-sections of a line bundle over the orbit, can be interpreted algebraically as an induced representation. The spectrum of the corresponding Schodinger operator is described explicitly using tools of representation theory, including the Frobenius reciprocity and Kostant's branching formula. In the second part some discrete versions of Dirac magnetic monopoles on S^2 are introduced and studied. The corresponding quantum Hamiltonian is a magnetic Schodinger operator on a regular polyhedral graph. The construction is based on interpreting the vertices of the graph as points of a discrete homogeneous space G/H, where G is a binary polyhedral subgroup of SU(2). The edges are constructed using a specially selected central element from the group algebra, which is used also in the definition of the magnetic Schrodinger operator together with a character of H. The spectrum is computed explicitly using representation theory by interpreting the Hilbert space as an induced representation.

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Goode, Brent. "Plasma response to waves in arbitrary magnetic field geometry." Diss., Connect to online resource, 2005. http://wwwlib.umi.com/cr/colorado/fullcit?p3190342.

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Mussa, Ali Ibrahim Al. "Convection and magnetoconvection problems in rapidly rotating spherical geometry." Thesis, University of Exeter, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324033.

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Papaharilaou, Yannis. "Studies of fluid flow in arterial bypass grafts by magnetic resonance imaging." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271254.

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Benedetti, Gabriele. "The contact property for magnetic flows on surfaces." Thesis, University of Cambridge, 2015. https://www.repository.cam.ac.uk/handle/1810/247157.

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This work investigates the dynamics of magnetic flows on closed orientable Riemannian surfaces. These flows are determined by triples (M, g, σ), where M is the surface, g is the metric and σ is a 2-form on M . Such dynamical systems are described by the Hamiltonian equations of a function E on the tangent bundle TM endowed with a symplectic form ω_σ, where E is the kinetic energy. Our main goal is to prove existence results for a) periodic orbits, and b) Poincare sections for motions on a fixed energy level Σ_m := {E = m^2/2} ⊂ T M . We tackle this problem by studying the contact geometry of the level set Σ_m . This will allow us to a) count periodic orbits using algebraic invariants such as the Symplectic Cohomology SH of the sublevels ({E ≤ m^2/2}, ω_σ ); b) find Poincare sections starting from pseudo-holomorphic foliations, using the techniques developed by Hofer, Wysocki and Zehnder in 1998. In Chapter 3 we give a proof of the invariance of SH under deformation in an abstract setting, suitable for the applications. In Chapter 4 we present some new results on the energy values of contact type. First, we give explicit examples of exact magnetic systems on T^2 which are of contact type at the strict critical value. Then, we analyse the case of non-exact systems on M different from T^2 and prove that, for large m and for small m with symplectic σ, Σ_m is of contact type. Finally, we compute SH in all cases where Σ_m is convex. On the other hand, we are also interested in non-exact examples where the contact property fails. While for surfaces of genus at least two, there is always a level not of contact type for topological reasons, this is not true anymore for S^2 . In Chapter 5, after developing the theory of magnetic flows on surfaces of revolution, we exhibit the first example on S^2 of an energy level not of contact type. We also give a numerical algorithm to check the contact property when the level has positive magnetic curvature. In Chapter 7 we restrict the attention to low energy levels on S^2 with a symplectic σ and we show that these levels are of dynamically convex contact type. Hence, we prove that, in the non-degenerate case, there exists a Poincare section of disc-type and at least an elliptic periodic orbit. In the general case, we show that there are either 2 or infinitely many periodic orbits on Σ_m and that we can divide the periodic orbits in two distinguished classes, short and long, depending on their period. Then, we look at the case of surfaces of revolution, where we give a sufficient condition for the existence of infinitely many periodic orbits. Finally, we discuss a generalisation of dynamical convexity introduced recently by Abreu and Macarini, which applies also to surfaces with genus at least two.

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Pedersen, H. "Geometry and magnetic monopoles : Constructions of Einstein metrics and Einstein-Weyl geometries." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353118.

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Herbrich, Peter. "Spectral aspects of broken drums and periodic magnetic Schrödinger operators." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607685.

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Meng, Jinglei. "Effect of geometry and anisotropy on the magnetic moment of type II superconductors." Thesis, University of Ottawa (Canada), 1994. http://hdl.handle.net/10393/9911.

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Formulae for the magnetic moment $\vec\mu$ of anisotropic platelets of high $T\sb{c}$ superconductors developed by Gyorgy et al and Peterson are frequently exploited by these and other researchers to estimate $j\sbsp{c}{c}$ and $j\sbsp{c}{ab}$, the critical current densities along the c axis and in the ab plane taken to be independent of the magnetic flux density B. These formulae were derived using the basic definition, $\ = ( -\ \mu\sb0H\sb{a})/\mu\sb0$ and ignoring end effects, (i.e. any demagnetizing fields), hence implied that the aspect ratio along the magnetizing field $H\sb{a}$ is large. This approximation is inappropriate for platelets penetrated by $H\sb{a}$. We develop these formulae using the alternative basic definition of a magnetic moment, $\vec\mu = 1/2\int(\vec{R}\times \vec{j})dV$. Now however, for the approach to be valid, $\vec{j} = j\sbsp{c}{c}$ or $\vec{j} = j\sbsp{c}{ab}$ must be independent of B (Bean approximation) and fill the entire volume of the specimen (i.e. a saturated critical state must be established). We show that these formulae are correct under these restrictions regardless of the configuration of $\vec{B}(x,y,z)$ and the neglect of end effects and attendant demagnetizing fields. Pursuing this framework and the latter definition we develop formulae for $\vec\mu$ for isotropic parallelepipeds of various aspect ratios as a function of their inclination $\theta$ with respect to the magnetizing field $\vec H\sb{a}$. We maintain throughout the critical assumption that the induced persistent currents circulate transverse to $\vec H\sb{a}$. The graphs of computations with these formulae are useful in identifying the role of geometry on the magnitude of $\vec\mu$. We also envisage two simple but basic regimes of anisotropy of the critical current densities. (Abstract shortened by UMI.)

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Nsibi, Mohamed Ali. "Asymmetric magnetic domain walls motion in a two-dimensional geometry : causes and effects." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAY047.

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L’étude du déplacement par le courant électrique des parois de domaine magnétique a généré beaucoup d’intérêt depuis l’observation de leurs importantes vitesses de déplacement dans des multicouches ayant une asymétrie d’inversion verticale (SIA). Cet intérêt se justifie par leur fort potentiel pour de nouvelles applications à basse consommation d’énergie en mémoire cache ou mémoires centrale. L’inversion de symétrie (SIA) induit deux mécanismes dont l’action conjointe permet de déplacer efficacement les parois de domaines. Il s’agit d’une contribution énergétique chirale, appelée l’interaction Dzyaloshinskii-Moriya (DMI), et des couples de spin-orbite (SOT). Ce modèle reste incomplet vu qu’il n’explique pas plusieurs résultats expérimentaux. De plus, une contribution dissipative chirale appelée l’amortissement anisotrope, également induite par la SIA, a été proposée récemment et dont le rôle, sous courant, n’as pas encore été étudié.Le but de ce travail a été d’amener une connaissance détaillée des différentes interactions en jeu dans la dynamique des parois de domaine. Pour cela, j’ai étudié la propagation de parois sous courant dans une géométrie non colinéaire. Cette étude a été réalisée dans des systèmes ayant des SIA différentes (Pt/Co/Pt et Pt/Co/AlOx). Dans cette géométrie, j’ai observé l’asymétrie du déplacement qui illustre la compétition entre les contributions chirales d’énergie et d’amortissement dans des multicouches à faible SIA. Quant aux multicouches à forte SIA, l’asymétrie ne peut être expliquée par l’action conjointe de DMI et SOT même dans le régime à forte mobilité. Une des conséquences de ce type de déplacement est de contribuer à la déviation des bulles de skyrmion en mouvement. Nous avons appelé cet effet l’effet Hall extrinsèque des skyrmions.En mettant en évidence de nouveaux effets induits par SIA, les résultats de cette thèse contribuent à une meilleur compréhension des mécanismes intervenant dans les déplacements des parois et des skyrmions sous courant dans les multicouches magnétiques
The study of the current-induced magnetic domain walls motion has attracted a lot of interest since the report of their large velocities of motion in thin layers with structural inversion asymmetry (SIA). This interest comes from their high potential for low power consumption functionalities in cache and main memories applications. The SIA induces two mechanisms whose combined action allows to drive efficiently the domain walls. The two mechanisms are the chiral energy term, called the Dzyaloshinskii-Moriya interaction (DMI), and the spin-orbit torques (SOT). This model is still incomplete since it does not explain several experimental results. In addition, a chiral dissipation term called the chiral damping, also induced by SIA, has recently been proposed. However, its effect on current-induced domain wall motion has not been studied.The objective of this work was to bring a more detailed understanding of the interactions involved in the domain wall motion. To that end, I have studied the domain wall motion in a non-collinear geometry with respect to the current, in materials with different SIA (Pt/Co/Pt and Pt/Co/AlOx). This motion has been found to be asymmetric. It illustrates the interplay between chiral energy and chiral dissipation in current-induced domain wall motion in weak SIA materials. In large SIA materials, the DMI and SOT model, even in the flow regime of motion, cannot explain this asymmetry. I have also evidenced that the asymmetric non-collinear domain wall motion induces a well-defined deflection of the skyrmion bubbles. This is the first observation of the extrinsic skyrmion Hall effect.The results of this thesis contribute to the understanding of the physical mechanisms behind domain wall and skyrmion motion in ultrathin layers by evidencing supplementary effects from SIA

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Körs, Boris. "Open strings in magnetic background fields." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2001. http://dx.doi.org/10.18452/14635.

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Es werden verschiedene Aspekte interner magnetischer Hintergrundfelder in Theorien offener Strings diskutiert. Phaenomenologisch und konzeptionell interessante Eigenschaften solcher Vakua, die Brechung von Supersymmetrie, Eichsymmetrie und chiraler Symmetrie, werden auf ganz generische Weise behandelt. Dann wird eine Spezialisierung auf Typ I Modelle, kompaktifiziert auf Tori und Bahnfaltigkeiten, durchgefuehrt. Daraus wird eine Methode gewonnen zur Konstruktion von Typ I Vakua mit attraktiven effektiven Feldtheorien als Niederenergienaeherungen, sowohl supersymmetrische wie nicht supersymmetrische Modelle mit chiralen Fermionspektren und Eichgruppen aehnlich dem Standardmodell oder einer vereinheitlichenden Verallgemeinerung desselben. Die am weitesten entwickelten Beispiele kombinieren magnetische Felder mit NSNS B-Feldern auf Bahnfaltigkeiten. Zuletzt wird noch eine verwandte Klasse von Modellen besprochen, die zwar eher weniger vielversprechende phaenomenologische Perspektiven bietet, aber einige konzeptionelle Spezialitaeten aufweist. In diesen Kompaktifizierungen werden asymmetrische Rotationen geeicht, so dass D-branen mit unterschiedlichen Werten fuer die magnetischen Felder auf ihrem Weltvolumen identifiziert werden, womit die Unterscheidung von kommutativen und nicht kommutativen Geometrien verlorengeht.
We discuss various aspects of internal magnetic background fields in open string theories. Phenomenologically and conceptually interesting properties of such string theory backgrounds, supersymmetry and gauge symmetry breaking, chiral fermion spectra and noncommutativity of the internal compactification manifolds, are treated in a rather generic framework. We then specialize to type I compactifications on tori and toroidal orbifolds with magnetic fields on the internal space. This allows to develop a strategy for constructing type I vacua with attractive low energy field theories which may either be supersymmetric or not and contain chiral spectra and gauge groups close to the Standard Model or some grand unified generalization thereof. The most sophisticated version uses magnetic fields and NSNS B-fields on orbifold spaces giving rise to a plethora of promising examples for semi-realistic string compactifications. We finally also present a related class of asymmetric orbifolds of type I which are of little phenomenological interest but still display certain interesting features. The asymmetric rotations which are gauged in these models identify D-branes with different values for the magnetic field on their world volume, such that the distinction of commutative and noncommutative internal geometries is lost.

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Книги з теми "Magnetic geometry"

Atiyah, Michael. The geometry and dynamics of magnetic monopoles. Princeton, N.J: Princeton University Press, 1988.

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Atiyah, Michael Francis. The geometry and dynamics of magnetic monopoles. Princeton, N.J: Princeton University Press, 1988.

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(Firm), Planet Dexter, ed. Magnetic pattern blocks. Reading, MA: Planet Dexter, 1996.

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Inc, Dorling Kindersley Publishing, ed. My magnetic shape book. New York: Dorling Kindersley, 2001.

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Geometry with an introduction to cosmic topology. Sudbury, Mass: Jones and Bartlett Publishers, 2008.

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E, Langenheim Victoria, and Geological Survey (U.S.), eds. Preliminary potential-field constraints on the geometry of the San Fernando basin, southern California. Menlo Park, Calif: U.S. Dept. of the Interior, U.S. Geological Survey, 2000.

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Turchi, Peter J. The effects of magnetic nozzle configurations on plasma thrusters: Final report, grant/contract no.: NAG3-843. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Zhang, Keqian. Electromagnetic theory for microwaves and optoelectronics. 2nd ed. Berlin: Springer, 2008.

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Zhang, Keqian. Electromagnetic theory for microwaves and optoelectronics. Berlin: Springer, 1998.

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Частини книг з теми "Magnetic geometry"

Reiss, G., H. Koop, D. Meyners, A. Thomas, S. Kämmerer, J. Schmalhorst, M. Brzeska, X. Kou, H. Brückl, and A. Hütten. "Magnetic Tunneling Junctions — Materials, Geometry and Applications." In Magnetic Nanostructures, 147–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-49336-5_10.

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Udrişte, C., A. Udrişte, V. Balan, and M. Postolache. "Magnetic dynamical systems." In New Developments in Differential Geometry, 407–14. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0149-0_34.

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Inoguchi, Jun-ichi, and Marian Ioan Munteanu. "Slant Curves and Magnetic Curves." In Contact Geometry of Slant Submanifolds, 199–259. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-0017-3_9.

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Cantarella, Jason, Dennis Deturck, Herman Gluck, and Mikhail Teytel. "Influence of Geometry and Topology on Helicity." In Magnetic Helicity in Space and Laboratory Plasmas, 17–24. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm111p0017.

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Ojha, Bhupesh. "Geometry Optimization of Magneto-Rheological Damper Based on Magnetic Saturation." In Lecture Notes in Mechanical Engineering, 699–705. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8704-7_86.

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Pariat, Étienne. "Using Magnetic Helicity, Topology, and Geometry to Investigate Complex Magnetic Fields." In Topics in Magnetohydrodynamic Topology, Reconnection and Stability Theory, 145–75. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-16343-3_5.

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Balinsky, Alexander A., W. Desmond Evans, and Roger T. Lewis. "Inequalities and Operators Involving Magnetic Fields." In The Analysis and Geometry of Hardy's Inequality, 165–212. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-22870-9_5.

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Udriste, Aneta, and Constantin Udriste. "Dynamics Induced by a Magnetic Field." In New Developments in Differential Geometry, Budapest 1996, 429–42. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-5276-1_31.

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Odenbach, Stefan. "Transport phenomena in magnetic fluids in cylindrical geometry." In Physics of Rotating Fluids, 156–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/3-540-45549-3_10.

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Yershov, Kostiantyn V., and Oleksii M. Volkov. "Geometry-Induced Magnetic Effects in Planar Curvilinear Nanosystems." In Topics in Applied Physics, 1–35. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09086-8_1.

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Тези доповідей конференцій з теми "Magnetic geometry"

SHI, Qingsong. "MAGNETIC JACOBI FIELDS FOR SURFACE MAGNETIC FIELDS." In 4th International Colloquium on Differential Geometry and its Related Fields. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814719780_0014.

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ADACHI, Toshiaki. "MAGNETIC JACOBI FIELDS FOR KÄHLER MAGNETIC FIELDS." In Proceedings of the 2nd International Colloquium on Differential Geometry and Its Related Fields. WORLD SCIENTIFIC, 2011. http://dx.doi.org/10.1142/9789814355476_0003.

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Fitzgerald, Desmond, and Simge Ayfer. "Inferring dyke geometry from magnetic survey." In First International Meeting for Applied Geoscience & Energy. Society of Exploration Geophysicists, 2021. http://dx.doi.org/10.1190/segam2021-w6-01.1.

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Mohri, K., K. Takagi, and S. Yoshino. "Coil And Conductor Geometry And Magnetic Stimulation." In 1993 Digests of International Magnetics Conference. IEEE, 1993. http://dx.doi.org/10.1109/intmag.1993.642583.

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Kutt, Lauri, and Muhammad Shafiq. "Magnetic sensor coil shape geometry and bandwidth assessment." In 2011 7th International Conference-Workshop "Compatibility And Power Electronics" (CPE). IEEE, 2011. http://dx.doi.org/10.1109/cpe.2011.5942279.

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Golbabaee, Mohammad, Dongdong Chen, Pedro A. Gomez, Marion I. Menzel, and Mike E. Davies. "Geometry of Deep Learning for Magnetic Resonance Fingerprinting." In ICASSP 2019 - 2019 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP). IEEE, 2019. http://dx.doi.org/10.1109/icassp.2019.8683549.

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Eichler, Chad E., Leo K. Cheng, Niranchan Paskaranandavadivel, Saeed Alighaleh, Timothy R. Angeli-Gordon, Peng Du, Leonard A. Bradshaw, and Recep Avci. "Reconstruction of stomach geometry using magnetic source localization." In 2021 43rd Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC). IEEE, 2021. http://dx.doi.org/10.1109/embc46164.2021.9630644.

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Biggs, Elijah, Chin-Hsing Kuo, and Ting Ren. "Magnetization, Geometry, and Segmentation Analysis of Nested Halbach Cylinders for Optimizing the Interactive Torque." In ASME 2023 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/detc2023-115290.

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Abstract Cylindrical permanent magnets with a Halbach magnetization are used for a variety of applications. Nesting two such cylinders concentrically and rotating one with respect to the other generates a passive torque, which could be harnessed to counterbalance a payload attached to the rotating magnet. In this paper, we analyze the effects of critical magnetic and geometrical parameters of the nested Halbach cylinders on the generated interactive torques by using electromechanical simulation software. Specifically, the effects of the dipolar and multipolar Halbach magnetization patterns, cylinder geometric parameters, and cylinder segmentation are of major interest in this study. The results show that the optimal Halbach magnetization pattern is one where the exterior cylinder has an internal magnetic field while the interior cylinder has an external magnetic field. The simulation observes changes in the magnitude of the interactive torque for modifications in the radial width ratio, thickness-to-width ratio, and thickness ratio of the cylinders. To maximize the torque, the airgap between the cylinders should be as minimal as possible. Outer cylinders that are segmented into eight or more discrete arc shapes could reliably approximate the torque produced by the ideal continuous magnetization. Moreover, the study shows that the interactive torque of a segmented outer cylinder could approach the ideal maximum torque produced by a continuous magnetic cylinder. It is anticipated that the outcome of this study is beneficial for the optimal design of nested Halbach cylinders for gravity compensation.

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ADACHI, Toshiaki. "A STUDY ON TRAJECTORY-HORNS FOR KÄHLER MAGNETIC FIELDS." In 5th International Colloquium on Differential Geometry and its Related Fields. WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813220911_0007.

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Yoon, Hong Min, and Joon Sang Lee. "Effect of the contact geometry on nanoscale and sub-nanoscale friction behaviors." In 2016 Asia-Pacific Magnetic Recording Conference (APMRC). IEEE, 2016. http://dx.doi.org/10.1109/apmrc.2016.7524286.

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Звіти організацій з теми "Magnetic geometry"

Pease, J. Structures of peptide families by nuclear magnetic resonance spectroscopy and distance geometry. Office of Scientific and Technical Information (OSTI), December 1989. http://dx.doi.org/10.2172/7003404.

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S.A. Cohen, A. S. Landsman, and A. H. Glasser. Stochastic Ion Heating in a Field-reversed Configuration Geometry by Rotating Magnetic Fields. Office of Scientific and Technical Information (OSTI), June 2007. http://dx.doi.org/10.2172/963547.

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Gopinath, K. S., D. C. Kennedy, and J. M. Gelb. Relativistic charged particle in magnetic dipole-spherical geometry. III. Local three-dimensional states. Office of Scientific and Technical Information (OSTI), July 1997. http://dx.doi.org/10.2172/532666.

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Walker, David N., R. F. Fernsler, D. D. Blackwell, and W. E. Amatucci. Magnetic Field and Geometry Effects on Finding Plasma Potential with a Cylindrical Impedance Probe. Fort Belvoir, VA: Defense Technical Information Center, July 2012. http://dx.doi.org/10.21236/ada565465.

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X. Z. Tang. On the Ideal Boundary Condition in a General Toroidal Geometry for a Mixed Magnetic Field Representation. Office of Scientific and Technical Information (OSTI), December 2000. http://dx.doi.org/10.2172/772281.

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Halasyamani, Shiv, and Craig Fennie. Controlling Magnetic and Ferroelectric Order Through Geometry: Synthesis, Ab Initio Theory, Characterization of New Multi-Ferric Fluoride Materials. Office of Scientific and Technical Information (OSTI), November 2016. http://dx.doi.org/10.2172/1331973.

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Nestleroth. L52117 Dual Magnetization MFL for Enhanced Assessment of Corrosion Anomalies. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), January 2008. http://dx.doi.org/10.55274/r0010957.

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Magnetic flux leakage (MFL) is the most commonly used in-line inspection method for pipelines and will most likely remain the preferred technology for many decades. However, MFL does have its limitations on sizing corrosion anomalies. This work investigates an enhanced MFL implementation to improve assessment of corrosion anomalies. This implementation uses signals recorded at two magnetization levels: high levels typical of modern commercial MFL tools and low levels near the knee of the nonlinear magnetization curve. A method for combining signals from both field levels was developed, which can detect plastic deformation stresses on smaller defects and define sharp geometry changes of larger defects. This method was tested on 21 corrosion anomalies with mixed results. Some unique information about stress at long, narrow corrosion anomalies was obtained from the two magnetization level signals. Unfortunately, an unexpected nonlinear geometry signal was also present in many of the corrosion anomalies that obscured the stress signal, limiting the general application of this technique to narrow anomalies.

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Clapham. L52206 3D Details of Defect-Induced MFL and Stress in Pipelines. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), December 2002. http://dx.doi.org/10.55274/r0011358.

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The following report represents a continuation of our ongoing efforts to understand and quantify the effect of stress on MFL signals from oil and gas transmission line inspection tools. Earlier GRI funding has enabled us to develop an unprecedented understanding of stress effects on magnetic behaviour in pipeline steels, and this understanding is now further enhanced and applied to specific problems such as MFL signals from interacting defects and also MFL signals produced from mechanical damage. This report summarizes the result of the 2002 studies. These studies focused on 3 main areas: MFL signals from interacting defects � examined how magnetic behaviour is altered when two pits are sufficiently close that their stress and magnetization fields interact. This produces MFL signal effects that differ from those of isolated defects. MFL signal dependence on elastic, plastic and residual strain � this continues our fundamental investigation into stress effects. By combining applied uniaxial strain and stress-relief heat treatments, we have been able to show how magnetic behaviour and MFL signals respond to different types of deformation. Specifically, we have found the elastic deformation has a significant effect, but that plastic deformation does not. This is a fundamental result on which our further modeling and experimental studies are based. MFL signals from mechanical damage � this is the first year we have turned our attention to this specific area, however our earlier results have laid the groundwork for these studies. MFL signals from dents contain geometry and stress components. We have conducted experimental and finite element modeling studies of MFL signals from dented samples, and have shown that the MFL signal from shallow dents arises from the residual stress pattern, while severe dent signals are mainly related to dent geometry. This work forms the main part of a continuing study.

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Dietiker, B., A. J.-M. Pugin, H. Crow, K. Brewer, and H. A. J. Russell. Geophysical data interpretation for the York University ATES site investigation, Ontario. Natural Resources Canada/CMSS/Information Management, 2024. http://dx.doi.org/10.4095/332366.

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Aquifer Thermal Energy Storage (ATES) systems have the potential of reducing heating and cooling energy consumption at institutional and commercial scales. ATES systems are popular in Europe, particularly in areas of extensive glacial and post glacial unconsolidated sediment. Southern Ontario shares numerous similarities with such settings. To support an ATES study at York University, Toronto, Ontario, three geophysical datasets were collected i) Microtremor analysis (the horizontal-to-vertical spectral ratio technique, HVSR), ii) seismic reflection, and iii) borehole geophysics. The three techniques provide different scales and resolution of subsurface investigation and form a complementary suite of tools. In areas with thick sediment cover, depth to bedrock estimations often suffer from sparse data. The HVSR technique is a low cost, nonintrusive, rapid approach to estimating depth to bedrock. ATES systems commonly require enhanced information on the succession of surficial geological units, and aquifer geometry and heterogeneity. Seismic reflection data collection can provide insights into all these characteristics and consequently provide greatly enhanced target information for follow-up drilling. The confidence in seismic interpretation can be improved through collection of subsurface information from drilling, either through the combination of drill core logging (sedimentology), core testing, and downhole geophysics. Multiple downhole geophysical data were collected to support i) lithological characterisation (gamma, conductivity, magnetic susceptibility), ii) seismic velocity analysis (p and s-wave), and iii) hydrogeological characteristics (temperature, and porosity using nuclear magnetic resonance). Collectively, the geophysical data can be framed in a basin analysis methodology. This study shows that these surveys can reduce uncertainty - and potentially the cost - of mitigating a poorly understood geological context that could compromise the full potential of an ATES development.

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Dinovitzer, Aaron. PR-214-114504-R01 Development of Sleeve End Fillet Weld Fitness for Service Assessment. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), April 2020. http://dx.doi.org/10.55274/r0010989.

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Full encirclement repair sleeves with fillet-welded ends are often used as permanent repairs on pipelines to reinforce and develop pressure retaining repairs on areas with defects, such as cracks, dents, or corrosion. In-service failures have occurred at pressure retaining sleeves as a result of defects associated with the sleeve welds, such as hydrogen-induced cracks, undercut at the fillet welds and inadequate weld size. Currently, there are no reliable methods to carry out a quantitative fitness for service assessment for a sleeve fillet weld with a weld fault because: - The stresses at the sleeve end fillet weld roots and toes are not easily determined; - Stress intensity factor solutions are not available for the sleeve fillet weld geometry; and - Ccurrent inspection procedures cannot effectively define the size of weld defects. Following completion of a sleeve fillet weld it is currently common practice to carry out a visual inspection and magnetic particle inspection (MPI) to determine whether weld toe defects exist. With continuing advances in nondestructive examination (NDE) technologies, the ability to not only inspect for toe and root flaws but also to size these cracks is becoming a reality. The current project has developed a flaw acceptance criteria which will fill gaps in the available engineering critical assessment procedures for sleeve repairs on all grades of pipelines.

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