Bibliographies thématiques / Circular arcs

Littérature scientifique sur le sujet « Circular arcs »

Auteur : Grafiati
Publié le 18 mai 2024

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Articles de revues sur le sujet "Circular arcs"

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Aichholzer, Oswin, Wolfgang Aigner, Franz Aurenhammer, Kateřina Čech Dobiášová, Bert Jüttler et Günter Rote. « Triangulations with Circular Arcs ». Journal of Graph Algorithms and Applications 19, no 1 (2015) : 43–65. http://dx.doi.org/10.7155/jgaa.00346.

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Souppez, Jean-Baptiste R. G., Patrick Bot et Ignazio Maria Viola. « Turbulent flow around circular arcs ». Physics of Fluids 34, no 1 (janvier 2022) : 015121. http://dx.doi.org/10.1063/5.0075875.

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Schiefermayr, Klaus. « Chebyshev polynomials on circular arcs ». Acta Scientiarum Mathematicarum 85, no 34 (2019) : 629–49. http://dx.doi.org/10.14232/actasm-018-343-y.

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Glassner, Andrew. « Reconciling Circular and Elliptical Arcs ». Journal of Graphics, GPU, and Game Tools 15, no 2 (11 mai 2010) : 95–98. http://dx.doi.org/10.1080/2151237x.2011.563679.

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Adamaszek, Michał, Henry Adams, Florian Frick, Chris Peterson et Corrine Previte-Johnson. « Nerve Complexes of Circular Arcs ». Discrete & ; Computational Geometry 56, no 2 (13 juillet 2016) : 251–73. http://dx.doi.org/10.1007/s00454-016-9803-5.

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Abbas, Muhammad, Norhidayah Ramli, Ahmad Abd Majid et Jamaludin Md Ali. « The Representation of Circular Arc by Using Rational Cubic Timmer Curve ». Mathematical Problems in Engineering 2014 (2014) : 1–6. http://dx.doi.org/10.1155/2014/408492.

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In CAD/CAM systems, rational polynomials, in particular the Bézier or NURBS forms, are useful to approximate the circular arcs. In this paper, a new representation method by means of rational cubic Timmer (RCT) curves is proposed to effectively represent a circular arc. The turning angle of a rational cubic Bézier and rational cubic Ball circular arcs without negative weight is still not more than4π/3andπ, respectively. The turning angle of proposed approach is more than Bézier and Ball circular arcs with easier calculation and determination of control points. The proposed method also provides the easier modification in the shape of circular arc showing in several numerical examples.
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Cretu, Simona Mariana, et Ionuţ Daniel Geonea. « Circular-Arc Radial Cams with One Connection Arc ». Applied Mechanics and Materials 896 (février 2020) : 83–94. http://dx.doi.org/10.4028/www.scientific.net/amm.896.83.

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This paper deals with the geometric and kinematic analysis of the circular-arc profile cams with one connection arc. If the maximum lift of the follower is required, it is shown that it is possible to connect two circular-arcs – that are defined by center of curvature and radius – through a single circular-arc, and the connection points result. But, if the connection points of two given circular-arcs of the cam profile are required, at least two circular-arcs are needed to connect them. The specific equations for the geometric analysis for one circular-arc profile are described. Also, for two mechanisms, one with straight-line profile and another with one circular-arc connection profile, the geometric and kinematic analysis and simulations of the movements using SolidWorks and ADAMS programs are presented
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PAL, SHYAMOSREE, RAHUL DUTTA et PARTHA BHOWMICK. « CIRCULAR ARC SEGMENTATION BY CURVATURE ESTIMATION AND GEOMETRIC VALIDATION ». International Journal of Image and Graphics 12, no 04 (octobre 2012) : 1250024. http://dx.doi.org/10.1142/s0219467812500246.

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A novel algorithm to detect circular arcs from a digital image is proposed. The algorithm is based on discrete curvature estimated for the constituent points of digital curve segments, followed by a fast geometric analysis. The curvature information is used in the initial stage to find the potentially circular segments. In the final stage, the circular arcs are merged and maximized in length using the radius and center information of the potentially circular segments. Triplets of longer segments are given higher priorities; doublets and singleton arcs are processed at the end. Detailed experimental results on benchmark datasets demonstrate its efficiency and robustness.
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Lu, Li Zheng. « Adaptive Polynomial Approximation to Circular Arcs ». Applied Mechanics and Materials 50-51 (février 2011) : 678–82. http://dx.doi.org/10.4028/www.scientific.net/amm.50-51.678.

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We present a new adaptive method for approximating circular arcs in polynomial form by using the s-power series. Circular arcs can be expressed in infinite series form, we obtain the order-k Hermite interpolant by truncating at the kth term. An upper bound on the error of the interpolant is available, so we can obtain the lowest degree polynomial curve that approximates a circular arc within any user-prescribed tolerance. And this degree can be further reduced through subdivision, which generates a spline approximation with Ck continuity at the joints.
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Su, YuYang, BingXuan Yu, Ruixin Peng et HongShu Yan. « Image Edge Analysis and Application Based on Least Squares Fitting Model ». Highlights in Science, Engineering and Technology 9 (30 septembre 2022) : 298–309. http://dx.doi.org/10.54097/hset.v9i.1859.

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This paper presents an effective method to automatically segment and fit the edge contour curve data of a picture into straight line segments, circular arc segments or elliptical arc segments. Firstly, the curvature of each point is calculated, and the curvature change breakpoints are found to distinguish between straight lines, circular arcs and elliptical arcs; then, circular arc segments and elliptical arcs are distinguished by the change degree of curvature of adjacent points, and the automatic segmentation of contour edges is realized. Finally, the circular arc segment and elliptic arc segment are fitted by least squares method, based on which the length of the straight line, the direction angle of the circular arc, the rotation angle of the elliptic arc and other related information are calculated. The results show that our model can better identify the feature texture information of image edges.
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Thèses sur le sujet "Circular arcs"

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Sanyal, Barun Kumar. « Representations of digraphs using intervals or circular arcs ». Thesis, University of North Bengal, 1994. http://hdl.handle.net/123456789/597.

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Basu, Asim. « More results on representation of digraphs /bigraphs using intervals or circular-arcs ». Thesis, University of North Bengal, 2012. http://hdl.handle.net/123456789/20.

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Yin, Xianjun. « On large deformations of elastic circular arcs bifurcation, stability and application as spring and gripper elements / ». [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=974857106.

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Rullan, Jose M. « Flow Control Over a Circular Arc Airfoil by Periodic Blowing ». Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/10178.

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The flow over sharp-edged wings is almost always separated. The control of separated flows is possible and benefits can be achieved but only in a time average sense. A new design of an actuator was designed and tested which can achieve a wide range velocity of without frequency dependence, is free of oscillating components as well as free of secondary frequencies and therefore can be scaled up easily, unlike a traditional synthetic jet. The actuator can achieve a considerable amount of jet vectoring, thus aligning the disturbance with the leading edge shear layer. Results indicate that unsteady mini-jet actuation is an effective actuation device capable of increasing the lift in the stall region of the airfoil. Moreover, pressure measurements showed that two parameters could be altered to maximize the lift. The momentum coefficient needed a minimum value to exert influence and the actuating frequency need not be at exact the natural shedding frequency to improve the lift and can be operated at harmonics of the natural shedding frequency and obtain improvements.
Master of Science
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Miranda, Sergio. « Active Control of Separated Flow over a Circular-Arc Airfoil ». Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/34411.

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An experimental study of active control of fully separated flow over a symmetrical circular-arc airfoil at high angles of attack was performed. The experiments were carried out in a low-speed, open circuit wind tunnel. Angles of attack from 10 to 40 degrees were tested. Low-power input, unsteady excitation was applied to the leading or trailing edge shear layers. The actuation was provided by the periodic oscillation of a 4-percent-chord flap placed on the suction side of the airfoil and facing the sharp edge. Vortex-shedding frequencies were measured and harmonic combinations selected as the applied actuator frequencies. Pressure measurements over the airfoil show that the control increased the normal force coefficient by up to 70%. This supports the idea of vortex capture in the time-averaged sense, enhancing the lift on the airfoil by managing the shear layer roll up. The results indicate the viability of the control of large-scale flow fields by exploiting the natural amplification of disturbances triggered by small-scale actuators. The application of flow control on sharp-edged aircraft wings could lead to improved maneuverability, innovative flight control and weight reduction. These can be achieved by inexpensive, low-power, rugged actuators.
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Ferro, Fernando Luiz de Bragança. « Interação solo-estrutura em galpões metálicos treliçados com cobertura em arco metálico circular ». Pós-Graduação em Engenharia Civil, 2013. https://ri.ufs.br/handle/riufs/5002.

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The structural design engineer normally considers the soil element that supports foundation of a building behaves as a undeformable solid remains unchanged after application of the load over time. The practice in the design of foundations but indicates that the soil when subjected to loading of a building, it deforms and causes a disturbance in the structure. This phenomenon is called soil-structure interaction and had their computed for metal shed arch truss metallic circular effects. Changes in stresses and strains in the joints of the metal structure and displacements recorded on their joints were studied. The normal stress on the footing-soil interface and displacements occurred were also the object of the study. The procedure compared the solution using immovable supports with hypothesis admitting footing of various sizes by computing the effects of Soil-Structure Interaction. To obtain the results was performed a numerical modeling using finite element method using SAP 2000® software. The results confirmed that the initial estimate was that, even with small dimensions footings supporting large loads resulting from eccentricity moments and still involved only compressive stresses on the soil-footing interface.
O engenheiro projetista de estruturas normalmente considera que o solo, elemento que suporta as fundações de uma edificação, comporta-se como sendo um maciço indeformável permanecendo inalterado após a aplicação do carregamento ao longo do tempo. A prática no projeto de fundações indica porém que o solo quando submetido ao carregamento de uma edificação se deforma e com isso provoca uma perturbação na estrutura. Este fenômeno é denominado Interação Solo-Estrutura e teve os seus efeitos computados para um Galpão Metálico Treliçado em Arco Metálico Circular. Foram estudadas as alterações dos esforços e tensões nas hastes da estrutura metálica e os deslocamentos verificados nos seus nós. As tensões normais na interface sapata-solo e os deslocamentos ocorridos também foram objeto do estudo. O procedimento comparou a solução utilizando apoios indeslocáveis com as hipóteses admitindo sapatas de várias dimensões computando-se os efeitos da Interação Solo-Estrutura. Para a obtenção dos resultados foi efetuada uma modelagem numérica utilizando o Método dos Elementos Finitos através do software SAP 2000®. Os resultados encontrados confirmaram a estimativa inicial que era a de que, mesmo sapatas com pequenas dimensões suportando grandes excentricidades decorrentes de cargas e momentos ainda assim trabalhavam apenas com tensões de compressão na interface sapata-solo.
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Mulligan, Ryan. « Defending Defense : Circular Arguments About Artmaking ». VCU Scholars Compass, 2005. http://scholarscompass.vcu.edu/etd/1370.

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This paper is a critical look at video and performance arts intrinsic relationship to culture. Investigations of storytelling, personal mythology, fear, and image saturation. Think-pieces on the nature of art in an entertainment society. Juggling a brief overview of various works and their relation to over arching themes of game theory, dark humor, and fascination with media. An in depth look at the process of the thesis show, "Defense is the Best Defense." Multiple takes on the thesis exhibit counterbalance the need for contemporary art to include description. This paper is a detailed look at the process of Ryan Mulligan's artwork and methods of materials. Ryan Mulligan's work takes the form of performance lectures, video, and installations. Here the intuitive is dismissed and a demystifying approach to describing production and theory bridges a gap in contemporary literature on art making. Anecdotal stories on process, desires, thrusts, and methods illuminate an any-means-necessary artistic approach.
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Pervez, Wajiha. « DESIGN FOR DISASSEMBLY - A CIRCULAR APPROACH ». VCU Scholars Compass, 2017. http://scholarscompass.vcu.edu/etd/4773.

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As the world becomes increasingly aware of the need to better care for the environment, innovative business models are helping to counter the damage of the fast fashion system - a phenomenon in the fashion industry whereby production processes are expedited in order to get new trends to the market as quickly and cheaply as possible. Designing products with a focus on their renewability can shift the product-consumer relationship. The closed loop concept of a “circular economy” is emerging as a viable and promising solution to the current linear business model. This study explores the possibilities of a more mindful approach to systems of production and consumption through material explorations using plastic from water bottles, paper from old newspaper and magazines, and fabric leftovers from pattern making within a circular economy. It considers the generative and renewable approaches in redefining how fashion engages with the components and raw materials of the industry. The research demonstrates a circular approach to the production of hospitality accessories in an effort to develop new intersections between products, materials, and consumers. The accessories are designed using discarded, reformulated denim–an abundant and underutilized byproduct of the fashion industry­–to reduce waste that currently occurs every time hotel chains and airlines produce disposable giveaway products from new materials.
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Cyr, Stéphane. « A theoretical model for flow about a circular-arc aerofoil with separation / ». Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61186.

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The aim of the present research is to develop a theoretical model that could predict the trailing-edge separation over a circular-arc aerofoil and its effect on the pressure distribution, and on the lift. The model uses sources, in a potential flow, to simulate the effect of the separated region on the pressure distribution. An integral method, turbulent boundary-layer development, combined with the irrotational pressure distribution on the circular-arc predicts the point of separation. To make sure that trailing-edge separation is present alone and mostly to avoid any difficulties in predicting the boundary-layer flow after reattachment, the aerofoil is studied at design incidence.
Two different circular-arc aerofoils were tested; one of 10% and one of 18% camber. The calculation for the 10% aerofoil did not predict any separation at design incidence, which was confirmed experimentally. The theoretical model predicted the right position of separation for the 18% aerofoil. It also provided a good simulation of the pressure distribution, including the right value for the base pressure and a good prediction of the lift. It follows that the pressure distribution when integrated, gives a good estimate of the pressure or form drag. (Abstract shortened by UMI.)
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Sherzad, Rafiullah, et Awrangzib Imamzada. « Buckling and Geometric Nonlinear Stress Analysis : Circular glulam arched structures ». Thesis, Linnéuniversitetet, Institutionen för byggteknik (BY), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-54569.

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An arched structure provides an effective load carrying system for large span structures. When it comes to long span roof structures, timber arches are one of the best solutions from both structural and aesthetical point of view. Glulam arched structures are often designed using slender elements due to economic consideration. Such slender cross-section shape increases the risk of instability. Instability analysis of straight members such as beam and column are explicitly defined in Eurocode. However, for instability of curved members no analytical approach is provided in the code, thus some numerical method is required. Nonetheless, an approximation is frequently used to obtain the effective buckling length for the arched structures in the plane of arches. In this master thesis a linear buckling analysis is carried out in Abaqus to obtain an optimal effective buckling length both in-plane and out-of-plane for circular glulam arched structures. The elastic springs are used to simulate the overall stiffness of the bracing system. The results obtained by the FE simulations are compared with a simple approximation method. Besides, the forces acting on the bracings system is obtained based on 3D geometric nonlinear stress analysis of the timber trusses. Our findings conclude that the approximation method overestimates the effective buckling length for the circular glulam arched structures. In addition, the study indicates that the position of the lateral supports along the length of the arch is an important design aspect for buckling behaviour of the arched structures. Moreover, in order to acquire an effective structure lateral supports are needed both in extrados and intrados. Furthermore, instead of using elastic spring elements to simulate the overall stiffness of the bracing system, a full 3D simulation of two parallel arches was performed. It was shown that the springs are stronger than the real bracing system for the studied arch.
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Livres sur le sujet "Circular arcs"

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The Scholastic integrated language arts resource book : Complete, thematic, cross-circular. New York : Scholastic Professional Books, 1995.

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Baldo, Ceolin M., dir. Il Pozzetto : Un orizzonte aperto. [Padova] : Editoriale Programma, 1991.

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Zum Rüstungswettlauf in der Nachkriegsepoche : Die Circuli vitiosi (Teufelskreise) der nuklearen Aufrüstung der Supermächte. Bern : Haupt, 1987.

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Taschereau), Catholic Church Archdiocese of Quebec Archbishop (1870-1898 :. Circulaire au clergé : I. Communion [p]ascale pendant tout le carême ; II. Pouvoir d'indulgencier les chapelets ... /[E.-A. arch. de Québec, i.e. Elzéar-Alexandre Taschereau]. [S.l : s.n., 1986.

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Catholic Church. Archdiocese of Quebec. Archbishop (1870-1898 : Taschereau). Circulaire au clergé : I. Compte rendu de la Société de colonisation du diocèse de Québec ; II. Visite pastorale de 1882 / [E.-A. arch. de Québec, i.e. Elzéar-Alexandre Taschereau]. [S.l : s.n., 1986.

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Wootton, J. G. Be zier curve approximations of sweeps and circular arcs. 1988.

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Yin, Xianjun. Large deformations of elastic circular arcs : bifurcation, stability and applications. Aachen : Shaker, 2003, 2003.

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Geometrical solutions of the lengths and division of circular arcs : The quadrature of the circle, trisection of the angle, duplication of the cube, and the quadrature of the hyperbola. Montreal : Printed for the author, 1985.

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Crawford, Margo Natalie. Epilogue. University of Illinois Press, 2018. http://dx.doi.org/10.5406/illinois/9780252041006.003.0009.

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This epilogue argues that feeling black post-black leads Black Arts Movement and 21st century artists to rethink how people live and create home in liminality. Crawford compares the images of home in Mat Johnson’s novel Loving Day and Nikki Giovanni’s poetry volume My House. This epilogue draws upon Nathanial Mackey’s theory of tidalectics (the circular dialectic of black aesthetics). Crawford unveils the love, sense of home, and anticipation that shape the tidalectics of black post-blackness.
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Il Pozzetto : Un orizzonte aperto. Editoriale Programma, 1991.

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Chapitres de livres sur le sujet "Circular arcs"

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Aichholzer, Oswin, Wolfgang Aigner, Franz Aurenhammer, Kateřina Čech Dobiášová, Bert Jüttler et Günter Rote. « Triangulations with Circular Arcs ». Dans Graph Drawing, 296–307. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-25878-7_29.

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van Dijk, Thomas C., Arthur van Goethem, Jan-Henrik Haunert, Wouter Meulemans et Bettina Speckmann. « Map Schematization with Circular Arcs ». Dans Geographic Information Science, 1–17. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-11593-1_1.

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Alam, Md Jawaherul, David Eppstein, Michael Kaufmann, Stephen G. Kobourov, Sergey Pupyrev, André Schulz et Torsten Ueckerdt. « Contact Graphs of Circular Arcs ». Dans Lecture Notes in Computer Science, 1–13. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-21840-3_1.

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Bodansky, Eugene, et Alexander Gribov. « Approximation of Polylines with Circular Arcs ». Dans Graphics Recognition. Recent Advances and Perspectives, 193–98. Berlin, Heidelberg : Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-25977-0_18.

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Kresan, Tetiana, Serhii Pylypaka, Tatiana Volina, Iryna Rybenko et Oleksandr Tatsenko. « Non-circular Wheels from Congruent Arcs ». Dans Lecture Notes in Mechanical Engineering, 44–53. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-16651-8_5.

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Cheng, C. C., C. A. Duncan, M. T. Goodrich et S. G. Kobourov. « Drawing Planar Graphs with Circular Arcs ». Dans Graph Drawing, 117–26. Berlin, Heidelberg : Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/3-540-46648-7_12.

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Béla, Szilvia, et Bert Jüttler. « Approximating Algebraic Space Curves by Circular Arcs ». Dans Curves and Surfaces, 157–77. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27413-8_10.

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Nguyen, Thanh Phuong, et Bertrand Kerautret. « Ellipse Detection through Decomposition of Circular Arcs and Line Segments ». Dans Image Analysis and Processing – ICIAP 2011, 554–64. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-24085-0_57.

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Schmid, G., L. Altamirano Robles et W. Eckstein. « Automatic segmentation of boundaries in line segments and circular arcs ». Dans Computer Analysis of Images and Patterns, 556–61. Berlin, Heidelberg : Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/3-540-60268-2_344.

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Roussillon, Tristan, et Jacques-Olivier Lachaud. « Accurate Curvature Estimation along Digital Contours with Maximal Digital Circular Arcs ». Dans Lecture Notes in Computer Science, 43–55. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21073-0_7.

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Actes de conférences sur le sujet "Circular arcs"

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Rosin, P., et G. A. W. West. « Detection of Circular Arcs in Images ». Dans Alvey Vision Conference 1988. Alvey Vision Club, 1988. http://dx.doi.org/10.5244/c.2.40.

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Rosin, P. L., et G. A. W. West. « Perceptual grouping of circular arcs under projection ». Dans British Machine Vision Conference 1990. British Machine Vision Association, 1990. http://dx.doi.org/10.5244/c.4.67.

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Zakaria, Wan Zafira Ezza Wan, et Jamaludin Md Ali. « Shaped curve by blending two circular arcs ». Dans PROCEEDINGS OF THE 21ST NATIONAL SYMPOSIUM ON MATHEMATICAL SCIENCES (SKSM21) : Germination of Mathematical Sciences Education and Research towards Global Sustainability. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4887636.

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Kallay, Michael. « Defining circular arcs on a round earth ». Dans the 1st International Conference and Exhibition. New York, New York, USA : ACM Press, 2010. http://dx.doi.org/10.1145/1823854.1823905.

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Zhang, Xiaohui, Weibin Liu et Weiwei Xing. « Robust Radial Distortion Estimation Using Good Circular Arcs ». Dans The 21st International Conference on Distributed Multimedia Systems. KSI Research Inc. and Knowledge Systems Institute Graduate School, 2015. http://dx.doi.org/10.18293/dms2015-021.

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Yang, Han, Qiang Li et Xuezhang Liang. « Approximations of Circular Arcs by Quartic Bézier Curves ». Dans 2019 6th International Conference on Information Science and Control Engineering (ICISCE). IEEE, 2019. http://dx.doi.org/10.1109/icisce48695.2019.00042.

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Nuntawisuttiwong, Taweechai, et Natasha Dejdumrong. « An Approach to Bézier Curve Approximation by Circular Arcs ». Dans 2018 15th International Joint Conference on Computer Science and Software Engineering (JCSSE). IEEE, 2018. http://dx.doi.org/10.1109/jcsse.2018.8457180.

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NOMIKOS, CHRISTOS, ARIS PAGOURTZIS et STATHIS ZACHOS. « AN APPROXIMATION ALGORITHM FOR W-COLORING OF CIRCULAR ARCS ». Dans Proceedings of the 7th Hellenic Conference on Informatics (HCI '99). WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812793928_0020.

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Schomberg, Kyll A., Graham Doig et John Olsen. « Design of High Area Nozzle Contours Using Circular Arcs ». Dans 50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference. Reston, Virginia : American Institute of Aeronautics and Astronautics, 2014. http://dx.doi.org/10.2514/6.2014-3999.

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Carter, Thomas, et Mayer Humi. « Near-Circular or Near-Rectilinear Arcs of Keplerian Orbits ». Dans AIAA/AAS Astrodynamics Specialist Conference and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.2004-5301.

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Rapports d'organisations sur le sujet "Circular arcs"

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Parzen, G. Symplectic Tracking Using Point Magnets and a Reference Orbit Made of Circular Arcs and Straight Lines. Office of Scientific and Technical Information (OSTI), juin 1993. http://dx.doi.org/10.2172/1119374.

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Parzen, G. Symplectic tracking using point magnets and a reference orbit made of circular arcs and straight lines. Office of Scientific and Technical Information (OSTI), juin 1993. http://dx.doi.org/10.2172/10178232.

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Swinson, W. F., R. L. Battiste et G. T. Yahr. Circular arc fuel plate stability experiments and analyses for the advanced neutron source. Office of Scientific and Technical Information (OSTI), août 1995. http://dx.doi.org/10.2172/204253.

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Harris, L. B., P. Adiban et E. Gloaguen. The role of enigmatic deep crustal and upper mantle structures on Au and magmatic Ni-Cu-PGE-Cr mineralization in the Superior Province. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328984.

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Résumé :
Aeromagnetic and ground gravity data for the Canadian Superior Province, filtered to extract long wavelength components and converted to pseudo-gravity, highlight deep, N-S trending regional-scale, rectilinear faults and margins to discrete, competent mafic or felsic granulite blocks (i.e. at high angles to most regional mapped structures and sub-province boundaries) with little to no surface expression that are spatially associated with lode ('orogenic') Au and Ni-Cu-PGE-Cr occurrences. Statistical and machine learning analysis of the Red Lake-Stormy Lake region in the W Superior Province confirms visual inspection for a greater correlation between Au deposits and these deep N-S structures than with mapped surface to upper crustal, generally E-W trending, faults and shear zones. Porphyry Au, Ni, Mo and U-Th showings are also located above these deep transverse faults. Several well defined concentric circular to elliptical structures identified in the Oxford Stull and Island Lake domains along the S boundary of the N Superior proto-craton, intersected by N- to NNW striking extensional fractures and/or faults that transect the W Superior Province, again with little to no direct surface or upper crustal expression, are spatially associated with magmatic Ni-Cu-PGE-Cr and related mineralization and Au occurrences. The McFaulds Lake greenstone belt, aka. 'Ring of Fire', constitutes only a small, crescent-shaped belt within one of these concentric features above which 2736-2733 Ma mafic-ultramafic intrusions bodies were intruded. The Big Trout Lake igneous complex that hosts Cr-Pt-Pd-Rh mineralization west of the Ring of Fire lies within a smaller concentrically ringed feature at depth and, near the Ontario-Manitoba border, the Lingman Lake Au deposit, numerous Au occurrences and minor Ni showings, are similarly located on concentric structures. Preliminary magnetotelluric (MT) interpretations suggest that these concentric structures appear to also have an expression in the subcontinental lithospheric mantle (SCLM) and that lithospheric mantle resistivity features trend N-S as well as E-W. With diameters between ca. 90 km to 185 km, elliptical structures are similar in size and internal geometry to coronae on Venus which geomorphological, radar, and gravity interpretations suggest formed above mantle upwellings. Emplacement of mafic-ultramafic bodies hosting Ni-Cr-PGE mineralization along these ringlike structures at their intersection with coeval deep transverse, ca. N-S faults (viz. phi structures), along with their location along the margin to the N Superior proto-craton, are consistent with secondary mantle upwellings portrayed in numerical models of a mantle plume beneath a craton with a deep lithospheric keel within a regional N-S compressional regime. Early, regional ca. N-S faults in the W Superior were reactivated as dilatational antithetic (secondary Riedel/R') sinistral shears during dextral transpression and as extensional fractures and/or normal faults during N-S shortening. The Kapuskasing structural zone or uplift likely represents Proterozoic reactivation of a similar deep transverse structure. Preservation of discrete faults in the deep crust beneath zones of distributed Neoarchean dextral transcurrent to transpressional shear zones in the present-day upper crust suggests a 'millefeuille' lithospheric strength profile, with competent SCLM, mid- to deep, and upper crustal layers. Mechanically strong deep crustal felsic and mafic granulite layers are attributed to dehydration and melt extraction. Intra-crustal decoupling along a ductile décollement in the W Superior led to the preservation of early-formed deep structures that acted as conduits for magma transport into the overlying crust and focussed hydrothermal fluid flow during regional deformation. Increase in the thickness of semi-brittle layers in the lower crust during regional metamorphism would result in an increase in fracturing and faulting in the lower crust, facilitating hydrothermal and carbonic fluid flow in pathways linking SCLM to the upper crust, a factor explaining the late timing for most orogenic Au. Results provide an important new dataset for regional prospectively mapping, especially with machine learning, and exploration targeting for Au and Ni-Cr-Cu-PGE mineralization. Results also furnish evidence for parautochthonous development of the S Superior Province during plume-related rifting and cannot be explained by conventional subduction and arc-accretion models.
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Observations about joined circular arcs. Gaithersburg, MD : National Institute of Standards and Technology, 1993. http://dx.doi.org/10.6028/nist.ir.5216.

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