Bibliografias temáticas / Continuous arcs

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Literatura científica selecionada sobre o tema "Continuous arcs"

Autor: Grafiati

Publicado: 22 de fevereiro de 2025

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Artigos de revistas sobre o assunto "Continuous arcs"

Nikiel, Jacek. "Continuous images of arcs". Proceedings of the American Mathematical Society 103, n.º 3 (1 de março de 1988): 961. http://dx.doi.org/10.1090/s0002-9939-1988-0947691-9.

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Uahabi, Kaoutar Lamrini, e Mohammed Zaoui. "Behavior of the Trinomial ArcsB(n,k,r)when0<α<1". International Journal of Mathematics and Mathematical Sciences 2007 (2007): 1–8. http://dx.doi.org/10.1155/2007/91535.

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We deal with the familyB(n,k,r)of trinomial arcs defined as the set of roots of the trinomial equationzn=αzk+(1−α), wherez=ρeiθis a complex number,nandkare two integers such that0<k<n, andαis a real number between0and1. These arcsB(n,k,r)are continuous arcs inside the unit disk, expressed in polar coordinates(ρ,θ). The question is to prove thatρ(θ)is a decreasing function, for each trinomial arcB(n,k,r).

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Fichou, Goulwen, e Masahiro Shiota. "Continuous mappings between spaces of arcs". Bulletin de la Société mathématique de France 143, n.º 2 (2015): 315–37. http://dx.doi.org/10.24033/bsmf.2689.

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Bankston, Paul. "On continuous images of ultra-arcs". Topology and its Applications 261 (julho de 2019): 7–21. http://dx.doi.org/10.1016/j.topol.2019.05.001.

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Nikiel, J., L. B. Treybig e H. M. Tuncali. "Local connectivity and maps onto non-metrizable arcs". International Journal of Mathematics and Mathematical Sciences 20, n.º 4 (1997): 681–88. http://dx.doi.org/10.1155/s0161171297000938.

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Three classes of locally connected continua which admit sufficiently many maps onto non-metric arcs are investigated. It is proved that all continua in those classes are continuous images of arcs and, therefore, have other quite nice properties.

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Daniel, D., J. Nikiel, L. B. Treybig, M. Tuncali e E. D. Tymchatyn. "Continuous images of arcs: Extensions of Cornette's Theorem". Topology and its Applications 195 (novembro de 2015): 63–69. http://dx.doi.org/10.1016/j.topol.2015.09.030.

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Nikiel, J., H. M. Tuncali e E. D. Tymchatyn. "Continuous images of arcs and inverse limit methods". Memoirs of the American Mathematical Society 104, n.º 498 (1993): 0. http://dx.doi.org/10.1090/memo/0498.

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Lončar, Ivan. "ℵ1-directed inverse systems of continuous images of arcs". International Journal of Mathematics and Mathematical Sciences 24, n.º 2 (2000): 109–19. http://dx.doi.org/10.1155/s016117120000363x.

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The main purpose of this paper is to prove that ifX={Xa,pab,A}is a usualℵ1-directed inverse system of continuous images of arcs with monotone bonding mappings, thenX=limXis a continuous image of an arc (Theorem 2.4). Some applications of this statement are also given.

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Janson, Svante. "Random coverings of the circle by arcs with restricted endpoints". Journal of Applied Probability 25, n.º 1 (março de 1988): 215–19. http://dx.doi.org/10.2307/3214248.

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A circle is covered by random arcs with a given length a and endpoints chosen (independently and uniformly) among m equispaced points on the circle. The asymptotic distribution as a → 0 and m → ∞of the number of arcs required for complete coverage is given. The result connects earlier results for the cases ma = 1 (a discrete problem) and m = ∞ (the continuous limiting case).

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Janson, Svante. "Random coverings of the circle by arcs with restricted endpoints". Journal of Applied Probability 25, n.º 01 (março de 1988): 215–19. http://dx.doi.org/10.1017/s002190020004078x.

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Teses / dissertações sobre o assunto "Continuous arcs"

Barreau, Gabriel. "Application d'une méthode semi-implicite couplée avec des outils d'adaptation de maillage anisotropique pour modéliser des arcs continus". Electronic Thesis or Diss., Toulouse, ISAE, 2024. http://www.theses.fr/2024ESAE0059.

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Un avion de ligne est foudroyé en moyenne une à deux fois par an, en considérant la taille des flottes d’avions dans le monde, c’est un phénomène assez fréquent. Lors du foudroiement, le courant injecté peut varier de 200 à 200kA. L’éclair peut alors être divisé en deux phases distincts : la phase impulsionnelle où l’intensité du courant peut atteindre 200kA pendant quelques microsecondes. Elle génère des chocs associés à un écoulement compressible. La phase continue où l’intensité du courant de quelques centaines d’ampères est quasi constant sur une durée de quelques centaines de millisecondes. L’écoulement autour de l’arc a des caractéristiques d’écoulement incompressible.La modélisation de ce phénomène en une seule simulation est très complexe car elle fait intervenir deux physiques d’écoulement différentes, et donc en général la partie continue est modélisée par des méthodes incompressibles et la partie impulsionnelle par des méthodes compressibles. Or, il n’est pas possible de résoudre des écoulements compressibles avec une méthode incompressible, et à cause de la contrainte sur le pas de temps, une méthode compressible n’est pas adaptée pour la résolution d’écoulement incompressible.Comme on souhaite modéliser un foudroiement dans son intégralité, on va chercher des méthodes compressibles capables de résoudre des écoulements bas Mach pour des valeurs de pas de temps raisonnables. Les méthodes semi-implicites sont des méthodes qui en implicitant une partie des termes des équations de conservations permettent de réduire la contrainte sur le pas de temps et permettent alors de résoudre un écoulement bas Mach avec un schéma compressibles.Après une étude bibliographique sur les méthodes existantes, une nouvelle méthode semi-implicite traitant le gaz réel a été développé dans le cadre de cette thèse et a été implémentée dans le code MHD Taranis. La prise en compte des gaz réels est possible grâce à l’utilisation de tables thermodynamiques qui sont générées par le code Sethi. . Pour diminuer les contraintes sur les temps de simulation des géométries 3D, le code Taranis est couplé avec des outils d’adaptation de maillage anisotrope développé à l’INRIA. Ces outils permettent de générer un maillage qui va s’adapter selon l’écoulement de la configuration et donc mailler uniquement aux endroits où c’est nécessaire. Il a été alors nécessaire d’adapter les critères d’adaptation développés pour les calculs de mécanique des fluides à ceux d’un plasma thermique.Pour valider la capacité du nouveau schéma à modéliser des arcs continus, une configuration d’un arc à combustion libre entre cathode en forme de pointe et une anode en forme de plaque est modélisation en 3D. Cette configuration permettra de montrer la capacité du code Taranis à modéliser des arcs continus, et de montrer les intérêts des outils d’adaptation de maillage dans le cas de modélisation d’écoulement plasma
A commercial aircraft is struck by lightning on average once or twice a year. Considering the size of the global aircraft fleet, this is a fairly common phenomenon. During a lightning strike, the injected current can vary from 200 to 200 kA. The lightning can then be divided into two distinct phases: the impulsive phase, where the current intensity can reach 200 kA for a few microseconds, generating shocks associated with compressible flow; and the continuous phase, where the current intensity of a few hundred amperes remains almost constant over a duration of a few hundred milliseconds. The flow around the arc has incompressible flow characteristics during this phase.Modeling this phenomenon in a single simulation is very complex because it involves two different flow physics, so generally, the continuous part is modeled using incompressible methods, and the impulsive part using compressible methods. However, it is not possible to solve compressible flows with an incompressible method, and due to the time step constraint, a compressible method is not suitable for solving incompressible flow.As we aim to model a lightning strike in its entirety, we will seek compressible methods capable of resolving low Mach number flows with reasonable time step values. Semi-implicit methods are techniques that, by implicitly handling some terms of the conservation equations, reduce the time step constraint and thus allow solving low Mach number flows with a compressible scheme.After a bibliographical study on existing methods, a new semi-implicit method handling real gas was developed as part of this thesis and implemented in the MHD code Taranis. The consideration of real gases is made possible through the use of thermodynamic tables generated by the Sethi code. To reduce constraints on simulation times for 3D geometries, the Taranis code is coupled with anisotropic mesh adaptation tools developed at INRIA. These tools generate a mesh that adapts according to the configuration flow, thus meshing only where necessary. It was then necessary to adapt the adaptation criteria developed for fluid mechanics calculations to those of a thermal plasma.To validate the new scheme's ability to model continuous arcs, a configuration of a free-burning arc between a pointed cathode and a plate anode is modeled in 3D. This configuration will demonstrate the Taranis code's capability to model continuous arcs and show the benefits of mesh adaptation tools in plasma flow modeling

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Wexelblat, Alan Daniel. "A feature-based approach to continuous-gesture analysis". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/29074.

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Vigoda, Benjamin William 1973. "Continuous-time analog circuits for statistical signal processing". Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/62962.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2003.
Vita.
Includes bibliographical references (p. 205-209).
This thesis proposes an alternate paradigm for designing computers using continuous-time analog circuits. Digital computation sacrifices continuous degrees of freedom. A principled approach to recovering them is to view analog circuits as propagating probabilities in a message passing algorithm. Within this framework, analog continuous-time circuits can perform robust, programmable, high-speed, low-power, cost-effective, statistical signal processing. This methodology will have broad application to systems which can benefit from low-power, high-speed signal processing and offers the possibility of adaptable/programmable high-speed circuitry at frequencies where digital circuitry would be cost and power prohibitive. Many problems must be solved before the new design methodology can be shown to be useful in practice: Continuous-time signal processing is not well understood. Analog computational circuits known as "soft-gates" have been previously proposed, but a complementary set of analog memory circuits is still lacking. Analog circuits are usually tunable, rarely reconfigurable, but never programmable. The thesis develops an understanding of the convergence and synchronization of statistical signal processing algorithms in continuous time, and explores the use of linear and nonlinear circuits for analog memory. An exemplary embodiment called the Noise Lock Loop (NLL) using these design primitives is demonstrated to perform direct-sequence spread-spectrum acquisition and tracking functionality and promises order-of-magnitude wins over digital implementations. A building block for the construction of programmable analog gate arrays, the "soft-multiplexer" is also proposed.
by Benjamin Vigoda.
Ph.D.

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Reed, Anita. "Performance and Perception: An Experimental Investigation of the Impact of Continuous Reporting and Continuous Assurance on Individual Investors". [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002680.

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Legault, Julie S. M. Massachusetts Institute of Technology. "Amino : a domestic system for synthetic biology and continuous culturing". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98542.

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Thesis: S.M., Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2015.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Title as it appears in MIT Commencement Exercises program, June 5, 2015: Amino : a system for out-of-lab synthetic biology and continuous culturing Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 64-65).
With the ability to transfer a trait from one creature to another purposefully, synthetic biology is advancing across unforeseen domains. From algae cells that convert carbon dioxide to fuel, biocementation bacteria to terraform mars, and lab-grown meat, synthetic biology offers new materials for designers, technologists, and artists to explore, and yet, public opinion lags behind these scientific advancements. Anytime science advances faster than our ability to apprehend it, it produces progress but also fear, suspicion and uncertainty. Amino -- an object that allows direct interaction with microorganisms to experiment with biology as material -- sets out not simply to educate but to also be part of the early culture that metabolizes the changes underway. Amino is a design driven mini-lab that allows users to carry out a bacterial transformation and enables the subsequent care and feeding of the cells that are grown. Inspired by Tamagotchis, the genetic transformation of an organism's DNA is performed by the user through guided interactions, resulting in their synthetic organism for which they can care like you would a pet. Amino is developed using low cost ways of carrying out lab-like procedures in the home and is packaged in a suitcase-sized continuous bioreactor for cells.
by Julie Legault.
S.M.

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Thirkell, Paul. "The integration of digitally mediated imaging techniques with 19th century continuous tone printing processes". Thesis, University of the West of England, Bristol, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327367.

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Ishizaki, Suguru. "Typographic performance : continuous design solutions as emergent behaviors of active agents". Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/29105.

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Al-Tamimi, Rami Salhab. "Continuous time disaggregation in hierarchical production planning". [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001819.

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Lee, Sanghoon. "Econometrics of jump-diffusion processes : approximation, estimation and forecasting". Thesis, University of Southampton, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364734.

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Rahgozar, Mandana Seyed. "Estimation of evapotranspiration using continuous soil moisture measurement". [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001812.

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Livros sobre o assunto "Continuous arcs"

Nikiel, J. Concerning continuous images of arcs. Wroclaw: Mathem. inst. Univ. of Wroclaw, 1986.

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Nikiel, J. A continuous partial ordering for images of arcs. Wroclaw: Wyd-wo Uniwersytetu Wroclawskiego, 1986.

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Nikiel, Jacek. Continuous images of arcs and inverse limit methods. Providence, RI: American Mathematical Society, 1993.

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Coady, Janelle. Continuous improvement in the English classroom. Milwaukee, Wis: ASQ Quality Press, 2010.

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Glover, Charles J. Conservation principles of continuous media. 3^a ed. New York: McGraw-Hill, 1994.

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Diana, Rees, Rivalland Judith, Dewsbury Alison e Western Australia. Education Department., eds. Spelling developmental continuum. 2^a ed. Port Melbourne: Rigby Heinemann on behalf of the Education Department of Western Australia, 1997.

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Bruce, Shortland-Jones, e Dewsbury Alison, eds. Reading: Developmental continuum. Portsmouth, NH: Heinemann, 1997.

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Lathan, Sharon. In the arms of Mr. Darcy: Pride and prejudice continues. Napervile, Ill: Sourcebooks Landmark, 2010.

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San Bernardino City Unified School District., ed. Elementary language arts: Continuum K-6. San Bernardino, Ca: San Bernardino City Unified School District, 1985.

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Hackney, Clinton S. Zaner-Bloser handwriting: With continuous-stroke alphabet. Columbus, Ohio: Zaner-Bloser, 1999.

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Capítulos de livros sobre o assunto "Continuous arcs"

Das, K., e R. C. Batra. "Instabilites in Arch Shaped MEMS". In Continuous Media with Microstructure, 147–55. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11445-8_13.

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Pinnock, Andrew. "The grant–exchange continuum". In Funding the Arts, 213–38. London: Routledge, 2023. http://dx.doi.org/10.4324/9780429021947-15.

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Fornari, Fabio, e Antonio Mele. "Continuous Time Behavior of Non Linear Arch Models". In Dynamic Modeling and Econometrics in Economics and Finance, 31–55. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-4533-0_2.

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Champion, David C., e David L. Huston. "Applications of Neodymium Isotopes to Ore Deposits and Metallogenic Terranes; Using Regional Isotopic Maps and the Mineral Systems Concept". In Isotopes in Economic Geology, Metallogenesis and Exploration, 123–54. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27897-6_5.

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AbstractAlthough radiogenic isotopes historically have been used in ore genesis studies for age dating and as tracers, here we document the use of regional- and continental-scale Sm–Nd isotope data and derived isotopic maps to assist with metallogenic interpretation, including the identification of metallogenic terranes. For the Sm–Nd system, calculated Nd model ages, which are time independent, are of most value for small-scale isotopic maps. Typically, one- or two-stage depleted mantle model ages (TDM, T2DM) are used to infer age when the isotope characteristics of the rock were in isotopic equilibrium with a modelled (mantle) reservoir. An additional advantage is that Nd model ages provide, with a number of assumptions, an estimate of the approximate age of continental crust in a region. Regional- and continental-scale Nd model age maps, constructed from rocks such as granites, which effectively sample the middle to lower crust, therefore, provide a proxy to constrain the nature of the crust within a region. They are of increasing use in metallogenic analysis, especially when combined with a mineral systems approach, which recognizes that mineral deposits are the result of geological processes, at a scales from the ore shoot to the craton. These maps can be used empirically and/or predictively to identify and target large parts of mineral systems that may be indicative, or form part of, metallogenic terranes. Examples presented here include observed spatial relationships between mineral provinces and isotopic domains; the identification of old and/or thick cratonic blocks; determination of tectonic regimes favorable for mineralization; identification of isotopically juvenile zones that may indicate rifts or primitive arcs; recognition of crustal breaks that define metallogenic terrane boundaries or delineate fluid pathways; and, as baseline maps. Of course, any analysis of Sm–Nd and similar isotopic maps are predicated on integration with geological, geochemical and geophysical information data. In the future, research in this area should focus on the spatial and temporal evolution of the whole lithosphere at the province- to global-scales to more effectively targeting mineral exploration. This must involve integration of radiogenic isotopic data with other data, in particular, geophysical data, which has the advantage of being able to directly image the crust and lithosphere and being of a more continuous nature as compared to invariably incomplete isotopic data sets.

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Sinclair, Christine, Ricci-Jane Adams e John O’Toole. "Conclusion: A Continuum for Planning". In Landscapes: the Arts, Aesthetics, and Education, 177–98. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7609-8_12.

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Millman, L. S. Merritt, Daniel C. Richardson e Guido Orgs. "Continuous and collective measures of real-time audience engagement". In Routledge Companion to Audiences and the Performing Arts, 293–307. London: Routledge, 2022. http://dx.doi.org/10.4324/9781003033226-23.

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Schranz, C., P. D. Docherty, Y. S. Chiew, J. G. Chase e K. Möller. "A Time-Continuous Model of Respiratory Mechanics of ARDS Patients". In IFMBE Proceedings, 2166–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-29305-4_568.

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Andrews, K., K. Granland, Z. Chen, Y. Tang e C. Chen. "Automated 3D-Printer Maintenance and Part Removal by Robotic Arms". In Lecture Notes in Civil Engineering, 259–70. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_27.

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Abstract3D printing by means of fused filament fabrication involves extruding and depositing melted material in layers to produce a 3D part. Current 3D printing requires manual intervention from a human operator between prints, leading to inefficiency. The focus of this study was facilitating the automation of the additive manufacturing process. Based on suggestions for future works in this field, this study extended on automated 3D-part removal systems by implementing additional operations to automate the production process. The proposed system uses robotic arms and grippers to operate and maintain 3D printers; specifically, the removal of 3D-printed parts, the cleaning of printer beds, the application of glue to the printer beds to assist with print adhesion, and the monitoring of bed levelness. The importance of this contribution is the improved efficiency of 3D-printing production, allowing for continuous 3D-printer operation and decreasing the requirement for human interaction and monitoring in the production process. The system is demonstrated using a 7 degrees of freedom KUKA robotic arm and ROBOTIQ gripper to autonomously operate and maintain an Ender 3 V2 printer. Sensor data and information from the 3D printers was used to determine the required operation or function to be performed by the robotic system. Tasks were performed by automated movement sequences of the robotic arm and gripper using supplied data. System status was recorded for monitoring and alerting human operators when intervention was required. The implementation of these functions using an automated robotic system allows 3D-printing production to operate continuously for longer periods, increasing production efficiency as downtime and human involvement for maintenance between prints is minimized.

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Borlenghi, Paolo, Carmelo Gentile e Marco Pirrò. "Continuous Dynamic Monitoring and Automated Modal Identification of an Arch Bridge". In Lecture Notes in Civil Engineering, 166–76. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-07258-1_18.

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Borlenghi, Paolo, Manuel D’Angelo, Francesco Ballio e Carmelo Gentile. "Continuous Monitoring of Masonry Arch Bridges to Evaluate the Scour Action". In Lecture Notes in Civil Engineering, 400–408. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-91877-4_46.

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Trabalhos de conferências sobre o assunto "Continuous arcs"

Lee, I.-Pei, Yung-Heng Hsieh, Chun-Tai Yeh, Jheng-Yi Lin, Chang-Hong Wu e Pei-Chun Lin. "Achieving Continuous Bouncing Through Resonance-Driven Mechanisms". In 2024 International Conference on Advanced Robotics and Intelligent Systems (ARIS), 1–8. IEEE, 2024. http://dx.doi.org/10.1109/aris62416.2024.10680007.

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Hussam, Ragheed, Ansam Mohammed Abed, Ibrahem Ahmed, Zahraa N. Abdulhussain, Khaled Farhan, Ahmed Rasol Hasson e Ramy Riad Al-Fatlawy. "Edge Segmentation Applications to Design a Non-Destructive Recognition Algorithm for Continuous Actions in Martial Arts Videos". In 2024 International Conference on Smart Systems for Electrical, Electronics, Communication and Computer Engineering (ICSSEECC), 707–13. IEEE, 2024. http://dx.doi.org/10.1109/icsseecc61126.2024.10649445.

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Farahani, Alireza Ahanarani, Abbas Dideban e Ebrahim Najafgholi. "Modeling continuous systems by Petri Nets using speed control arcs". In 2016 4th International Conference on Control, Instrumentation, and Automation (ICCIA). IEEE, 2016. http://dx.doi.org/10.1109/icciautom.2016.7483139.

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Kao, Ju-Hsien, Han Tong Loh e Fritz B. Prinz. "Least-Square Biarc Curve Fitting for CNC Machining". In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/cie-4286.

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Abstract For CNC cutter path generation of nonlinear curves or surfaces, curve fitting using circular arc segments can be more efficient than linear segments. This paper presents a new algorithm for approximating large sets of points using a spline of biarcs, each of which consists of two circular arcs connected in tangent-continuous manner. The approach proposed in this paper differs from the previous work in that it does not require to pre-determine the number of arc segments, and yet all the family of biarcs between two points can be used, not only the ones which minimize the curvature difference or radii ratio. Combining the merits of least-square algorithms and binary search methods, this approach is capable of producing the minimum, or near minimum number of biarcs needed to approximate points within specified accuracy.

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Yin, Yue, LianShui Guo, Ning Han, Ji Zheng e Pengpeng Zhang. "A New Strategy of Cavity Cutting Trajectory Generation in High Speed Machining". In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-53700.

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High speed machining is widely used in manufacturing. For its high cutting speed, high feeding rate, and high machining accuracy, its requirements for cutting trajectory in high speed machining are so strict that only continuous and smooth trajectories with even cutting loads can lead to high machining efficiency and accuracy. The traditional row or ring machining trajectory fails to meet these requirements. In order to acquire the continuous and smooth machining trajectories, and to avoid load mutation in the machining process, some researchers developed a curvilinear cutting trajectory generating method based on partial differential equation. This trajectory, however, is still made up from free form curve segment, and unable to completely eliminate the effects on smoothness by line segment interpolation, which has a very adverse effect on the efficiency, tool life and machining accuracy. A new strategy to generate a continuous and smooth cavity cutting trajectories in high speed machining is introduced in this article. The new trajectory determines the necessity-nodes from outside (the boundary) to inside in the way of spiral cutting. It starts from the cavity center with spiral expanding, and each cutting loop adopts end connection between straight line and the tangent arc, meeting continuous first-order constraint satisfaction. The smooth trajectory reduces the amplitude and directing mutation of cutting force, thus effectively avoids the impact on the machining efficiency and machining accuracy by speeding down in the corner. The strategy also, by controlling the row space, ensures that there is no cutting residual. A cavity machining programming system based on this strategy is developed on Siemens UG-CAM module. The manufacturing of triangle cavities is studied as a case. It turns out that the new trajectory improves efficiency by 26.23% compared with the traditional one. It ensures a stable operation of the cutting tool in machining, therefore effectively extends the tool life. The main advantages are that the new strategy adopts the geometrical drawing strategy and the trajectories are all made up from the straight lines and the tangent arcs. The trajectory can greatly reduce NC code. It thoroughly removes the effort to mind the smooth, continuity and even cutting load of the tool-path.

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Jones, Stephen J., e Michael Lau. "Propulsion and Maneuvering Model Tests of the USCGC Healy in Ice and Correlation with Full-Scale". In SNAME 7th International Conference and Exhibition on Performance of Ships and Structures in Ice. SNAME, 2006. http://dx.doi.org/10.5957/icetech-2006-104.

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Propulsion model test results of the USCGC Healy are reported here and correlated with full-scale data. The design requirement for the Healy was for “continuous icebreaking at 3 knots through 4.5 ft (1.37 m) of ice of 100 psi (690 kPa) strength”. The full-scale trials were designed to test this capability. Unfortunately, the ice strength found on the trials was approximately half of that specified. One of the objects of the model tests was to determine the effect of ice strength on the delivered power necessary for the Healy to meet her icebreaking specification. Propulsion overload tests in open water combined with limited ice tests, and the IOT standard method for analyzing propulsion tests in ice, gave consistent results for delivered power, which agreed well with the available full-scale data from the Healy. A correlation friction coefficient of 0.05 was again shown to be appropriate. From the analysis of the resistance and propulsion tests, the Healy, with its total shaft horsepower of 30,000, was shown to be capable of its design requirement. Using a similar analysis, an imaginary “Polar 8” icebreaker of the Healy design was shown to require 85,000 HP to continuously break ice of 2.44 m (8 ft.) thickness, of 500 kPa strength, at 3 knots. Free running maneuvering tests performed in the ice tank gave arcs of circles whose diameters agreed well with the full-scale data of turning circles obtained on the ship trials.

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Abrahamsen, Mikkel. "Spiral Toolpaths for High-Speed Machining of 2D Pockets With or Without Islands". In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46255.

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We describe new methods for the construction of spiral toolpaths for high-speed machining. In the simplest case, our method takes a polygon as input and a number δ > 0 and returns a spiral starting at a central point in the polygon, going around towards the boundary while morphing to the shape of the polygon. The spiral consists of linear segments and circular arcs, it is G1 continuous, it has no self-intersections, and the distance from each point on the spiral to each of the neighboring revolutions is at most δ. Our method has the advantage over previously described methods that it is easily adjustable to the case where there is an island in the polygon to be avoided by the spiral. In that case, the spiral starts at the island and morphs the island to the outer boundary of the polygon. It is shown how to apply that method to make significantly shorter spirals in polygons with no islands than what is obtained by conventional spiral toolpaths. Finally, we show how to make a spiral in a polygon with multiple islands by connecting the islands into one island.

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KOBAYASHI, Masahiko, Naoki OZAKI, Nobuyuki SUZUKI e Yoshinobu OZAKI. "27 A New Method for Valve Seat without Ring". In Small Engine Technology Conference & Exposition. 10-2 Gobancho, Chiyoda-ku, Tokyo, Japan: Society of Automotive Engineers of Japan, 2002. http://dx.doi.org/10.4271/2002-32-1796.

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<div class="htmlview paragraph">A surface modification method by electrical discharge has been developed for the valve seats of aluminum cylinder heads. This method employs a conventional electrical discharge machine to generate continuous discharge arcs between an electrode and a cylinder head, whereby the molten electrode material is transferred and clad onto the valve seat area on the cylinder head. Using this new cladding method, a wear-resistant cladding can be formed on each valve seat area in a matter of minutes and, if the same number of electrodes as valve seat areas are set one on one, all the valve seat areas can be clad simultaneously. The advantages of this method include local cladding capability, outstanding adhesion, quick cladding speed, and excellent adaptability to various types of engines. The chemical composition of the cladding was determined by a preliminary test using dynamo engines, and the durability of the cladding was evaluated using the same dynamo engines. The results indicate the applicability of the surface modification method to high-output engines. This paper reports on the procedures and test results of this discharge cladding method.</div>

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Chiu, Chun-Chia, Yi-Hsiang Lo, Wei-Ting Ruan, Cheng-Han Yang, Ruen-Rone Lee e Hung-Kuo Chu. "Continuous circular scribble arts". In SIGGRAPH '15: Special Interest Group on Computer Graphics and Interactive Techniques Conference. New York, NY, USA: ACM, 2015. http://dx.doi.org/10.1145/2787626.2792600.

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Combes, Richard, Alexandre Proutiere e Alexandre Fauquette. "Unimodal Bandits with Continuous Arms". In SIGMETRICS '20: ACM SIGMETRICS / International Conference on Measurement and Modeling of Computer Systems. New York, NY, USA: ACM, 2020. http://dx.doi.org/10.1145/3393691.3394225.

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Relatórios de organizações sobre o assunto "Continuous arcs"

Mittelsteadt, Matthew. AI Verification: Mechanisms to Ensure AI Arms Control Compliance. Center for Security and Emerging Technology, fevereiro de 2021. http://dx.doi.org/10.51593/20190020.

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The rapid integration of artificial intelligence into military systems raises critical questions of ethics, design and safety. While many states and organizations have called for some form of “AI arms control,” few have discussed the technical details of verifying countries’ compliance with these regulations. This brief offers a starting point, defining the goals of “AI verification” and proposing several mechanisms to support arms inspections and continuous verification.

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Reeher, Lauren J. Interim Geologic Map of the Kamas Quadrangle, Summit and Wasatch Counties, Utah. Utah Geological Survey, maio de 2024. http://dx.doi.org/10.34191/ofr-763.

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The Kamas 7.5′ quadrangle is in the Wasatch back valleys about 30 miles (50 km) east of Salt Lake City, Utah. The quadrangle is centered over the north-south-trending Kamas Valley and contains the cities of Kamas and Oakley, and the town of Peoa. Kamas Valley is situated between the foothills of the Uinta Mountains to the east and the West Hills of the Keetley volcanic f ield to the west. The Kamas region is part of the Middle Rocky Mountains physiographic province, located at the juxtaposition of several key tectonic features. A major tectonic trend known as the Cheyenne Belt runs east-west along the northern margin of the Uinta Mountains and separates the Archean continental crust of the Wyoming Province to the north and Paleoproterozoic continental crust of the Yavapai-Mazatzal province to the south (Bryant and Nichols, 1988; Houston et al., 1993). This ancient suture zone has influenced the structural development of Uinta region since its formation. During Neoproterozoic time (~770 to 740 Ma), this weak suture zone formed the northern boundary of a faulted rift basin which accumulated up to 23,000 feet (7000 m) of Uinta Mountain Group sediment consisting of gravel, sand, and mud (Bryant and Nichols, 1988). The Neoproterozoic Uinta Mountain Group consists of the Red Pine Shale, Formation of Hades Pass, and Formation of Mount Watson in the western Uinta Mountains. These rocks are exposed 4 miles (6.5 km) east of the Kamas quadrangle (Bryant, 1990). The Proterozoic rift basin was subsequently inverted with episodic uplift during Phanerozoic time resulting in the east-west-trending structural high of the Uinta arch (Crittenden, 1976; Bruhn et al., 1986; Yonkee et al., 2014). The Uinta arch is part of a large structural zone that extends across the length of the Uinta Mountains, west through the Cottonwood canyons of the Wasatch Range, and continues westward through Tooele, Utah (Clark et al., 2020). The Uinta-Tooele structural zone (Clark, 2020) is marked by a suture in the Precambrian basement, a zone of tertiary igneous rocks extending west from the Kamas quadrangle, and localized uplifts during the Phanerozoic (Yonkee et al., 2014; Clark et al., 2020). Kamas Valley is positioned at a relative structural low between the Uinta and Cottonwood arch segments of the Uinta-Tooele structural zone, with the Uinta arch segment plunging west beneath the valley and the Cottonwood arch segment plunging east beneath the valley. This structural saddle is obscured by a blanket of Cenozoic volcanics and Neogene basin fill (Bradley and Bruhn, 1988; Bryant and Nichols, 1988).

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Wakefield, Benjamin. Opportunities for the European Union to Strengthen Biosecurity in Africa. Stockholm International Peace Research Institute, novembro de 2022. http://dx.doi.org/10.55163/hbpq5439.

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The European Union (EU) has a long history of commitment to improving biological security and supporting multilateral approaches to arms controls and non-proliferation. It has supported various biosecurity programmes in recent years and continues to increase its financial support towards these, with a focus on the universalization of the Biological and Toxins Weapons Convention and United Nations Security Council Resolution 1540. More recently, through Council Decision 2021/2072/ CFSP, the EU has committed even further to strengthening biosafety and biosecurity capabilities in Africa, with more meaningful collaboration and an increase in the local and regional ownership of projects. This provides an opportunity for the EU to continue to broaden its approach and improve coordination with international partners. In particular focus is the newly formed European Health Emergency Preparedness and Response Authority (HERA), as it develops its international activities. However, there is still a demonstrated need to strengthen biosecurity-related capacities and capabilities across Africa. This paper highlights the significant opportunities for EU engagement and coordination with international initiatives, such as the Africa Centres for Disease Control and Prevention (Africa CDC) Biosafety and Biosecurity Initiative (BBI) 2021–2025 Strategic Plan and the Global Partnership Signature Initiative to Mitigate Biological Threats in Africa.

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Vecchioni, Matilde, e Sanem Topal. Unregulated: Examining the Global Proliferation of Craft-Production Weapons. UNIDIR, fevereiro de 2024. http://dx.doi.org/10.37559/caap/24/pacav/02.

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Illicitly craft-produced small arms and light weapons (SALW) are increasingly used in episodes of armed violence, terrorism, and criminality across all regions of the world. Despite the global nature of this issue, and the significant challenges it poses for regulation, detection and control, a global discussion on and approach to this issue is lacking. In June 2024, UNIDIR will present a global study on crafted-produced SALW to increase knowledge and understanding on proliferation trends, and raise awareness of the challenges for preventing and addressing their illicit proliferation, trafficking, and misuse. This factsheet presents a preliminary and non-exhaustive overview of the information collected from 43 States, as well as United Nations entities, regional organizations, and civil society actors. This information is intended to support preparations for the Fourth Review Conference on the implementation of the Programme of Action (PoA) and International Tracing Instrument (ITI). Information presented in this Factsheet draws upon UNIDIR’s Global Survey on addressing the global craft production of SALW, which was distributed to all UN Member States during 2023. The Survey sought to gather information to enable a mapping of different types of SALW craft production around the globe, and identify challenges and effective measures to address the illicit proliferation of craft-produced SALW. UNIDIR continues to welcome contributions to this research.

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Estrada Villaseñor, Cecilia, Adam Dubin Edelstein, Jose Manuel Aparicio Malo e Raquel Verdasco Martínez. Data Culture in Human Trafficking II: Technical Research Report. Universidad Pontificia Comillas, outubro de 2024. http://dx.doi.org/10.14422/iuem.20241031.

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Human trafficking is recognized worldwide as a form of modern-day slavery that continues to devastate lives and communities. This criminal phenomenon not only constitutes a serious violation of human rights, but also represents one of the most lucrative illicit businesses globally, compared only to drug and arms trafficking. In this context, the collection and analysis of accurate and reliable data is essential to understand the magnitude and characteristics of human trafficking at our borders and to develop effective public policies. This report, developed within the framework of the "Data Culture in Human Trafficking" project, underlines the importance of a robust data culture that not only makes this problem visible, but also allows for the accountability and empowerment of key actors in the fight against trafficking. Data Culture in Human Trafficking is a comprehensive strategy that places data at the center of efforts to combat human trafficking. By improving the collection, analysis, and use of data, this approach seeks not only to make the true extent of trafficking visible, but also to develop more effective responses and better coordinate actions among all stakeholders. The aim of this report is to provide a comprehensive and detailed overview of the current situation of human trafficking in Spain, examining both the quantitative and qualitative dimensions of this phenomenon. Through the Multiple Systems Estimation (MSE) methodology and qualitative techniques, we seek not only to identify the visible victims, but also to unveil the hidden number of those who still remain in the shadows.

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Casper, Gary, Stfani Madau e Thomas Parr. Acoustic amphibian monitoring, 2019 data summary: Mississippi National River and Recreation Area. National Park Service, dezembro de 2022. http://dx.doi.org/10.36967/2295507.

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Amphibians are a Vital Sign indicator for monitoring long-term ecosystem health in seven national park units that comprise the Great Lakes Network. We present here the results for 2019 amphibian monitoring at Mississippi National River and Recreation Area (MISS). Appendices contain tabular summaries for six years of cumulative results. The National Park Service Great Lakes Inventory and Monitoring Network established 10 permanent acoustic amphibian monitoring sites at MISS in 2015. Acoustic samples are collected by placing automated recorders with omnidirectional stereo microphones at each of the 10 sampling sites. Temperature loggers co-located with the recorders also collect air temperature during the sampling period. Eight of the nine species of frog and toad known to occur at MISS were found in 2019. The most well distributed species were Eastern American Toad, Gray Treefrog, Green Frog, and Northern Leopard Frog. Rarer are Blanchard’s Cricket Frog, Cope’s Gray Treefrog, Wood Frog, and Boreal Chorus Frog. American Bullfrog has not yet been detected on GLKN monitored sites but has been recently confirmed nearby (Pigs Eye Lake). Two of the ten sites—MISS02, MISS04—were not sampled in 2019 due to flooding, and occupancy of early calling species at MISS06 was determined inconclusive due to a late sampling start. MISS07 was also deployed late and results may contain some false absences due to late sampling. We expanded analyses and reporting in 2018 to address calling phenology and to provide a second metric for tracking changes in abundance (as opposed to occupancy) across years. Occupancy analyses track whether or not a site was occupied by a species. Abundance is tracked by assessing how the maximum call intensity changes on sites across years, and by how many automated detections are reported from sites across years. Using two independent survey methods, manual and automated, with large sample sizes continues to return reliable results, providing a confident record of site occupancy for most species. There were some data collection issues in 2019, with two ARS units not deployed and two others with late start dates. This did reduce our ability to assess some sites and species. Summaries of 2019 data are shown in Appendices A, B and C, and cumulative data collection result summaries are provided in Appendix E. Since temperature logs show that the threshold of ≥40°F was already exceeded by 1 April in 2019, we recommend a 15 March start date for future data collection.

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