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Добірка наукової літератури з теми "Modal sheaves"

Автор: Grafiati

Опубліковано: 7 червня 2025

Оновлено: 2 серпня 2025

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Статті в журналах з теми "Modal sheaves"

1

Robinson, Michael. "Aggregation sheaves for greedy modal decompositions." Journal of Physics Communications 6, no. 4 (2022): 045004. http://dx.doi.org/10.1088/2399-6528/ac6482.

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Abstract This article develops a new theoretical basis for decomposing signals that are formed by the linear superposition of a finite number of modes. Each mode depends linearly on the weights within the superposition and nonlinearly upon several other parameters. The particular focus of this article is upon finding both the weights and the parameters when the number of modes is not known in advance. This article introduces a novel mathematical formalism, aggregation sheaves, and shows how they characterize the behavior of greedy algorithms that attempt to solve modal decomposition problems.

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2

Rokita, Tomasz. "Tests and Examination of Drive Sheave in Mine Skip Hoist." Archives of Mining Sciences 61, no. 2 (2016): 415–24. http://dx.doi.org/10.1515/amsc-2016-0030.

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Abstract This article describes a certain stage of work aimed at strength analysis of the structure of drive sheaves in mine shaft hoists. The work was initiated in connection with the emergence of cracks in those sheaves as a result of operation, and is an attempt to develop a new improved design of the drive sheave. The first stage involved several series of strain gauge measurements of stress in the drive sheaves of machines exposed to their rated load. Measurement technology and results are described in detail in (Rokita & Wójcik, 2013). The results of those measurements were the basis

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3

Barua, S., and I. El-Thalji. "Systems dynamic model of wear evolution for sheaves used in oil and gas hoisting operations." IOP Conference Series: Materials Science and Engineering 1294, no. 1 (2023): 012039. http://dx.doi.org/10.1088/1757-899x/1294/1/012039.

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Abstract The global offshore drilling contracted fleet consisted of 378 jack-ups, 68 semisubmersibles and 73 drillships, according to Westwood Global Energy Group, as of September 2023. In most regions of the world, rig activity has picked up from increased operator demand and pushed the marketed utilization for jack-ups from 76% to 85%, semis from 60% to 80% and drillships from 82% to 90%. The utilization of a drilling rig depends on various factors, mainly drilling demand, rig capability and specifications, and rig efficiency and reliability. Worn sheave grooves can pull down the efficiency

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4

Bucchi, Francesco, Francesco Frendo, Federico Bavaresco, and Giuseppe Conte. "Multibody simulation of a rope-driven automated people mover." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 232, no. 8 (2018): 2173–85. http://dx.doi.org/10.1177/0954409718764533.

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In this paper, a multibody model of the automated people mover, PisaMover, is presented. PisaMover is a rope-driven small train, composed of a few cabins, which makes use of train-inspired bogies. The aim of the model was to support the design of the architecture of the suspensions and to select the proper characteristics of the elastic and damping elements in order to fulfill comfort needs of passengers and to resolve the constraints related to the layout of the vehicle and the guide-ways. For this purpose, attention was especially focussed on the definition of the railway path and the modeli

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5

Fenina, S., T. Fakhfakh, and M. Haddar. "Dynamic behaviour of V-belt drive system in the presence of sheaves’ lateral misalignment." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, no. 9 (2008): 1673–79. http://dx.doi.org/10.1243/09544062jmes861.

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This paper presents the effects of lateral misalignment of sheaves, on the transverse span displacements of a serpentine belt drive system that contains a driving sheave, a driven sheave, a belt, and a dynamic tensioner. This defect gives rise to dangerous operating conditions for the system. A hybrid discrete—continuous model is adopted, in which the coupling between the discrete variables describing the rotational motion of the three sheaves and the tensioner arm and the continuous variables describing the transverse motion of the belt spans is taken into account. An analytical method based

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6

Zhu, Chengcheng, Fan Li, Dean Meng, and Yuanzhe Dong. "A Study of Large Sheave Counter-Roller Spinning Force." Journal of Physics: Conference Series 2261, no. 1 (2022): 012009. http://dx.doi.org/10.1088/1742-6596/2261/1/012009.

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Abstract In this paper, a counter-roller spinning method is presented, which is designed to produce relatively thin-walled large sheaves. The large sheave counter-roller spinning force is poorly studied. And the forming forces have a significant influence on industrial applications. Herein, theoretical analysis and numerical simulation methods were utilized to explore the large sheave counter-roller spinning process and spinning force. Anisotropy of the material was considered by the Hill-48 anisotropic yield criterion. Numerical simulation has been demonstrated to correspond to experimental v

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7

Jiang, Jun Ying, Zen Qiang Wang, Hong Wei Ma, Xu Hui Zhang, Hai Yan Wu, and You Jun Zhao. "Remote Monitoring and Control System for Electrical Haulage Shearer." Advanced Materials Research 909 (March 2014): 247–51. http://dx.doi.org/10.4028/www.scientific.net/amr.909.247.

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For the requirements and problems in remote monitoring and control system of electrical haulage shearer, this paper research the key technologies of shearers remote monitoring and control system, such as position and attitude testing, control strategy decision, communication real-time and reliability of network. Position and attitude testing method based SINS (Strap down Inertial Navigation System) was designed to measure position, attitude angle, speed and drum height of shearer together. The shearer control strategy based on work mode was proposed to control shearer working in optimal status

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8

Wang, Linlin, Dekun Zhang, Dagang Wang, and Cunao Feng. "A Review of Selected Solutions on the Evaluation of Coal-Rock Cutting Performances of Shearer Picks under Complex Geological Conditions." Applied Sciences 12, no. 23 (2022): 12371. http://dx.doi.org/10.3390/app122312371.

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During automatic and intelligent cutting at the coal mining face, complex geological conditions (fold structure, fault structure and magmatic intrusion) easily cause distinct occurrence conditions of coal rock seams (gangue, inclusion, or fault in the coal and rock), which induces different coal-rock cutting performances of shearer picks. Therefore, the objective of the present study is to review the selected solutions on the evaluation of coal-rock cutting performances of shearer picks under complex geological conditions. Occurrence conditions of coal rock seams were classified according to d

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9

Wang, Shi-bo, Shijia Wang, and Zhaoliang Ge. "A Mathematical Model and Error Analysis of Shearer Cutting Path Based on Its Attitude." Mathematical Problems in Engineering 2018 (September 17, 2018): 1–8. http://dx.doi.org/10.1155/2018/1790602.

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The horizon control system is the key technology in the automation of a shearer. The achievement of accurate shearer cutting path plays an important role for horizon control. A mathematical model of cutting path in the local geographic coordinate frame was built. Error analysis based on genetic algorithm (GA) was studied to guarantee the accuracy of the shearer cutting path. Parameters from a MG1000/2660-WD shearer and data from a working face were used to obtain the shearer cutting path with reference to the local geographic coordinate frame. Also, with error analysis based on GA, the desired

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10

He, Guifang, Chunfu Sheng, Hongwei He, et al. "Mathematical and geometrical modeling of braided ropes bent over a sheave." Journal of Engineered Fibers and Fabrics 15 (January 2020): 155892502093972. http://dx.doi.org/10.1177/1558925020939726.

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As soft elements for force transmission, braided fiber ropes play important roles in many fields where the fiber ropes are used bent over sheaves, while the relevant experiments are time-consuming and expensive. Computational simulation is a promising choice for evaluating the performance of fiber ropes when bent over a sheave. This article presents two methods that could be employed to build a model of braided rope bent over a sheave. One is the mathematical method which deduces the exact mathematical equations of braiding curves based on the Frenet–Serret frame. The spatial equations, consid

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Більше джерел

Дисертації з теми "Modal sheaves"

1

Aratake, Hisashi. "Sheaves of Structures, Heyting-Valued Structures, and a Generalization of Łoś's Theorem." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/265174.

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2

Lämmel, Marc, Evelin Jaschinski, Rudolf Merkel, and Klaus Kroy. "Microstructure of sheared entangled solutions of semiflexible polymers." Forschungszentrum Jülich, 2016. https://ul.qucosa.de/id/qucosa%3A15029.

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We study the influence of finite shear deformations on the microstructure and rheology of solutions of entangled semiflexible polymers theoretically and by numerical simulations and experiments with filamentous actin. Based on the tube model of semiflexible polymers, we predict that large finite shear deformations strongly affect the average tube width and curvature, thereby exciting considerable restoring stresses. In contrast, the associated shear alignment is moderate, with little impact on the average tube parameters, and thus expected to be long-lived and detectable after cessation of she

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3

Reif, Jens, Georg Winter, and Stefan Frauendorf. "Shell-Model Study of Shears Bands in Light Pb Nuclei." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-31803.

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Spherical shell-model calculations have been performed in the configuration space ( s1/2h9/2i13/2) and (p1/2p3/2f5/2i13/2) for protons and neutrons, respectively, in order to interpret the sequences of strong dipole transitions found in neutron-deficient Pb isotopes. Regular dipole bands are found if several high-j protons and high-j neutron holes are interacting with neutrons in the low-spin (fp) orbitals. The calculated B(M1) values are in the order of several µN2 for the deltaJ=1 transitions, and the crossover E2 transitions are very weak. The mechanism generating the dipole bands is found

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4

Reif, Jens, Georg Winter, and Stefan Frauendorf. "Shell-Model Study of Shears Bands in Light Pb Nuclei." Forschungszentrum Rossendorf, 1995. https://hzdr.qucosa.de/id/qucosa%3A22006.

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Анотація:

Spherical shell-model calculations have been performed in the configuration space ( s1/2h9/2i13/2) and (p1/2p3/2f5/2i13/2) for protons and neutrons, respectively, in order to interpret the sequences of strong dipole transitions found in neutron-deficient Pb isotopes. Regular dipole bands are found if several high-j protons and high-j neutron holes are interacting with neutrons in the low-spin (fp) orbitals. The calculated B(M1) values are in the order of several µN2 for the deltaJ=1 transitions, and the crossover E2 transitions are very weak. The mechanism generating the dipole bands is found

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5

James, Martin. "Tearing mode stability in a sheared slab model of the tokamak plasma." Thesis, University of Bristol, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501519.

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6

Peeva, Elitsa Radostinova. "Modulation of OPC migration : improving remyelination potential in multiple sclerosis." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31499.

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In the brain, axons are wrapped by myelin sheaths which ensure fast saltatory conduction of impulses and provide metabolic support. In multiple sclerosis (MS), the myelin sheaths are lost which leaves the axon denuded. This not only results in slower conduction of action potentials, but if prolonged, can also lead to axon death due to the loss of metabolic support. This neurodegeneration is the main cause of permanent disability in multiple sclerosis patients. The axon death and disability which stem from it could be prevented by restoring the myelin wrap before axon damage has occurred. This

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7

Hopkins, Alan John. "Computer simulation studies of dense suspension rheology : computational studies of model sheared fluids : elucidation, interpretation and description of the observed rheological behaviour of simple colloidal suspensions in the granulo-viscous domain by non-equilibrium particulate dynamics." Thesis, University of Bradford, 1989. http://hdl.handle.net/10454/4408.

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Rheological properties of idealised models which exhibit all the non-Newtonian flow phenomenology commonly seen in dense suspensions are investigated by particulate-dynamics computer-simulations. The objectives of these investigations are: (i) to establish the origins of various aspects of dense suspension rheology such as shear-thinning, shear thickening and dilatancy; (ii) to elucidate the different regions of a typical dense suspension rheogram by examining underlying structures and shear induced anisotropies in kinetic energy, diffusivity and pressure; (iii) to investigate the scaling of t

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8

Бубліков, Андрій Вікторович, Андрей Викторович Бубликов та A. V. Bublikov. "Автоматизація процесу управління видобувними комбайнами на основі моделювання роботи шнека". Thesis, Видавництво НГУ, 2010. http://ir.nmu.org.ua/handle/123456789/74.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.13.07 – «Автоматизація процесів керування». – Національний гірничий університет, Дніпропетровськ, 2010. В дисертаційній роботі запропоноване рішення актуальної наукової задачі розробки критерію заштибовки шнека і синтезу на його основі алгоритму автоматичного управління видобувним комбайном з позиції зниження питомих енерговитрат на видобуток вугілля. За критерій заштибовки шнека рекомендовано використовувати ковзне середнє відношення миттєвих значень потужності, споживаної електродвигуном приводу різання,

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9

Cheng-HsienLee and 李政賢. "Model of sheared granular material." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/04761990606263063764.

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博士<br>國立成功大學<br>水利及海洋工程學系碩博士班<br>98<br>This work developed a model of sheared granular materials. To capture the static and kinetic features of the granular flow involving different regimes, both the shear stress and pressure are superimposed by a rate-independent component (representing the static contribution) and a rate-dependent component (representing the kinetic contribution), as determined using granular kinetic theory. The dilatancy law is utilized as the equation of state, and the constraint that static pressure is nonnegative is utilized to determine the transition between the dense

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10

Wiedmann, Stefan. "Drinfeld-Moduln und elliptische Garben." Doctoral thesis, 2004. http://hdl.handle.net/11858/00-1735-0000-0006-B387-F.

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Книги з теми "Modal sheaves"

1

Ghilardi, Silvio, and Marek Zawadowski. Sheaves, Games, and Model Completions. Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-015-9936-8.

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2

Carson, Andrew B. Model completions, ring representations, and the topology of the Pierce sheaf. Longman Scientific & Technical, 1989.

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3

Ghilardi, Silvio. Sheaves, games, and model completions: A categorical approach to nonclassical propositional logics. Kluwer Academic Publishers, 2002.

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4

Ghilardi, Silvio. Sheaves, Games, and Model Completions: A Categorial Approach to Nonclassical Propositional Logics. Springer Netherlands, 2002.

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5

Ghilardi, Silvio. Sheaves, games, and model completions: A categorical approach to nonclassical propositional logics. Kluwer Academic Publishers, 2002.

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6

Ghilardi, S., and M. Zawadowski. Sheaves, Games, and Model Completions: A Categorical Approach to Nonclassical Propositional Logics (Trends in Logic). Springer, 2002.

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7

Comparison of currents predicted by NASCAP/LEO model simulations with elementary Langmuir-type bare probe models for an insulated cable containing a single pinhole. NASA, 1990.

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8

Bradford, University of, ed. Computer simulation studies of dense suspension rheology: Comutational studies of model sheared fluids; elucidation, interpretation and description of the observed rheological behaviour of simple colloidal suspensions in the granulo-viscous domain by non-equilibrium particulate dynamics. 1989.

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Частини книг з теми "Modal sheaves"

1

Woodard, Ben. "House of Sheaves." In Weaponising Speculation. punctum books, 2014. https://doi.org/10.21983/p3.0077.1.14.

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BRACKETING the taxonomic controversies surrounding Speculative Realism (is it a species of thought, how many subclasses are there, does it cohere at all?) one can assert that the rhetorical if not argumenta-tive core of Quentin Meillassoux’s reopening of the ‘great outdoors’ has been, and continues to be, a pervasive trajectory in contemporary thinking. This wilderness is differently carved according to varying rubrics: the proliferation of entities (Harman), the unbinding of the tran-scendental power of thought (Brassier), the absolutisation of facticity (Meillassoux), and the precedence of b

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2

Prest, Mike. "Model Theory for Sheaves of Modules." In Logic and Its Applications. Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-58771-3_9.

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3

Pietromonaco, Stephen. "The Derived Category of Coherent Sheaves and B-model Topological String Theory." In Springer Proceedings in Mathematics & Statistics. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-91626-2_14.

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4

Branlard, Emmanuel. "Analytical Model of a Wind Turbine in Sheared Inflow." In Research Topics in Wind Energy. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55164-7_25.

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5

Kusnick, J. F., and D. E. Adams. "Vertical Axis Wind Turbine Operational Modal Analysis in Sheared Wind Flow." In Topics in Experimental Dynamics Substructuring and Wind Turbine Dynamics, Volume 2. Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-2422-2_29.

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6

Wachla, Dominik. "A Mathematical Model of a Longwall Shearer Cutting System with Selected Faults." In Applied Condition Monitoring. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-62042-8_21.

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7

Hsu, Yuan Chuan, and Tung Sheng Yang. "A Predictive Model Construction for the Sheared Planes in Sheet Metal Shearing Process." In Optics Design and Precision Manufacturing Technologies. Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-458-8.590.

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8

Turkington, Bruce. "A Statistical Equilibrium Model of Zonal Shears and Embedded Vortices in a Jovian Atmosphere." In IUTAM Symposium on Advances in Mathematical Modelling of Atmosphere and Ocean Dynamics. Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0792-4_37.

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9

Vervust, Wouter, and An Ghysels. "Oxygen Storage in Stacked Phospholipid Membranes Under an Oxygen Gradient as a Model for Myelin Sheaths." In Advances in Experimental Medicine and Biology. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-14190-4_49.

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10

"Models, Sheaves, and Topos." In A Functorial Model Theory. Apple Academic Press, 2016. http://dx.doi.org/10.1201/b16416-10.

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Тези доповідей конференцій з теми "Modal sheaves"

1

Wang, Jue, Rui Zhang, Run Jiang, et al. "Reliability model and analysis of long wall coal shearer machine." In Third International Conference on Advanced Materials and Equipment Manufacturing (AMEM 2024), edited by Michele Penza and Shunli Wang. SPIE, 2025. https://doi.org/10.1117/12.3069102.

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2

Fardisi, Sina, Nima Tajallipour, and Patrick J. Teevens. "Simulation and Analysis of the Effect of Different Design Parameters on the General Corrosion in the Annular Space of Flexible Pipes." In CORROSION 2012. NACE International, 2012. https://doi.org/10.5006/c2012-01469.

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Abstract Flexible pipes are made of steel wires covered with a minimum of two polymer sheaths from inside (to protect the line from the bore flow) and outside (to protect the line from sea water). The space between the inner and outer polymer sheaths form an annular where corrosive species such as H2S, CO2, and H2O can penetrate, condense and accumulate. Corrosion in such conditions features some unique characteristics that are very different from conventional production lines. The amount of the electrolyte is very limited in these applications. This causes the electrolyte to become saturated

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3

Zhao, Rongxin, Feng Wang, Huayong Wu, and Zijie Zhou. "Recognition of Apparent Defects in Bridge Cable Bundle Wraps Based on Deep Learning Algorithms." In IABSE Symposium, Tokyo 2025: Environmentally Friendly Technologies and Structures: Focusing on Sustainable Approaches. International Association for Bridge and Structural Engineering (IABSE), 2025. https://doi.org/10.2749/tokyo.2025.1992.

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<p>Cables, as the main load-bearing components, have a profound impact on the lifespan of cable- structured bridges. With the rapid development of bridge construction in China, collapses due to cable fractures occur from time to time. Traditional methods for detecting apparent defects of cable sheaths through manual inspection are labor-intensive and involve certain safety risks, failing to meet the demands of the new era for cable defects detection. This paper employs mobile detection equipment to collect and locate high-definition images of cable sheaths, constructs an in-service bridg

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4

Kumar, Ashok, and Larry D. Stephenson. "In Situ Evaluation of Pipeline Coatings." In CORROSION 2002. NACE International, 2002. https://doi.org/10.5006/c2002-02093.

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Abstract In-situ laboratory testing of pipe coatings was conducted on three steel pipes measuring 2.5 inches (6.35 cm) in outer diameter X 6 feet (183 cm) long that had been buried in Champaign, Illinois soil for the past 14 years. Prior to burial, two of the pipes had been coated with 0.0315 inch (0.8 mm) thick polyethylene sheaths, and intentional coating flaws were introduced by stripping the coating along the length of the pipe to create bare areas measuring 1% and 10% the total pipe surface area, respectively. The third pipe was not coated prior to burial (i.e., 100% bare). The soil was s

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5

Alam, Qazi Muneeb, Aslam Faqeer Mohammad, and Syed Salman Mobeen. "Seismic Response of Structures Subjected to Pounding under Mainshock-Aftershock Sequences." In 14th International Civil Engineering Conference. Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-air6rh.

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During earthquakes, structures can collide with each other due to provision of very small or no gap between them. This collision can cause massive amount of damage and it can be a very critical issue for structures which get subjected to mainshock-aftershock sequence of significant magnitude. In the usual design practice of building structures, neither pounding nor aftershocks are considered. Therefore, in the current study, a detailed investigation of structures which can be commonly found in Karachi is performed when they are subjected to pounding under mainshock-aftershock sequences. To thi

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Mohammadi, Narges, and José Luis Escalona. "Dynamic Simulation of Reeving Systems With the Extension of the Modal Approach in the Axial Direction." In ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/detc2021-71078.

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Abstract In this work, the simulation of reeving systems has been studied by including axial modes using the Arbitrary Lagrangian-Eulerian (ALE) description. The reeving system is considered as a deformable multibody system in which the rigid bodies are connected by the elastic wire ropes through sheaves and reels. A set of absolute nodal coordinates and modal coordinates is employed to describe the motion and deformation in the axial direction. This new method allows the analysis of elements with non-constant axial strain along its length. In addition, modal coordinates are employed to descri

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Kvinge, Henry, Brett Jefferson, Cliff Joslyn, and Emilie Purvine. "Sheaves as a Framework for Understanding and Interpreting Model Fit." In 2021 IEEE/CVF International Conference on Computer Vision Workshops (ICCVW). IEEE, 2021. http://dx.doi.org/10.1109/iccvw54120.2021.00469.

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"A LOCAL-GLOBAL MODEL FOR MULTIAGENT SYSTEMS - Sheaves on the Category MAS." In International Conference on Agents and Artificial Intelligence. SciTePress - Science and and Technology Publications, 2012. http://dx.doi.org/10.5220/0003742103310334.

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Davies, P., N. Lacotte, G. Kibsgaard, et al. "Bend Over Sheave Durability of Fibre Ropes for Deep Sea Handling Operations." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-11332.

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This paper describes work performed within a Joint Industry Project aiming to evaluate the lifetime of deep sea handling ropes. Various HMPE (High Modulus Polyethylene) fiber ropes, with and without coatings, have been studied under both tensile and cyclic bend over sheave (CBOS) loading. A large test program has enabled both tension-cycle to failure relationships and empirical expressions for residual strength after cycling to be determined. A special device was then developed to apply a known couple to the sheave, allowing both dynamic friction measurements to be made and the influence of ap

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Shi, Yong, Yize Sun, Yiman Zhao, and Qi Chang. "Three-dimensional mathematical model of memory cutting for shearer." In 2016 2nd International Conference on Control, Automation and Robotics (ICCAR). IEEE, 2016. http://dx.doi.org/10.1109/iccar.2016.7486735.

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Звіти організацій з теми "Modal sheaves"

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Sullivan, Regina M., Joseph E. Shepherd, Michelle K. Scarfe, Ioannis G. Mikellides, and Lee K. Johnson. Effect of Wall Sheaths on Ion Trajectories in a Hall Thruster Numerical Model. Defense Technical Information Center, 2009. http://dx.doi.org/10.21236/ada506237.

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Chen, James, Robert A. Sabtoro, Adam Szabo, and Davin E. Larson. A Hybrid Kinetic Model of Asymmetric Thin Current Sheets with Sheared Flows in a Collisionless Plasma. Defense Technical Information Center, 2010. http://dx.doi.org/10.21236/ada539720.

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