Bibliografie tematiche / Curvature generation

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Letteratura scientifica selezionata sul tema "Curvature generation"

Autore: Grafiati
Pubblicato: 31 agosto 2024

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Articoli di riviste sul tema "Curvature generation"

1

Kitaeva, Galiya Kh, Dmitrii A. Markov, Daniil A. Safronenkov e Natalia V. Starkova. "Prism Couplers with Convex Output Surfaces for Nonlinear Cherenkov Terahertz Generation". Photonics 10, n. 4 (13 aprile 2023): 450. http://dx.doi.org/10.3390/photonics10040450.

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Sideways THz generation in Mg:LiNbO3 crystal is studied considering Si-prism-lens couplers with different output surface curvatures. A theoretical approach is developed for modeling the angular distributions of THz radiation power inside the crystal, inside the Si coupler and outside in free space. Our calculations show how the imposition of a plano-convex lens on the standard flat prism can substantially improve the THz generation efficiency. The ratio between the lens curvature radius and the distance from the curvature center to the point of generation on the lens axis is found to be one of the most important parameters. The developed general approach can be used for the further design of the optimal THz extraction elements of a different configuration.
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Chang, Lichun, Yao Zhao, Hua Yuan, Xiaocai Hu, Zhen Yang e Hao Zhang. "Effect of Plate Curvature on Heat Source Distribution in Induction Line Heating for Plate Forming". Applied Sciences 10, n. 7 (27 marzo 2020): 2304. http://dx.doi.org/10.3390/app10072304.

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Line heating is an essential process in the formation of ship hull plates with a complex curvature. Electromagnetic induction heating is widely used in the line heating process. In electromagnetic induction heating, the shape of the coil and the air gap between the inductor and workpiece could influence the heat source distribution. Moreover, in the line heating process, the change of curvature of the plate will cause a change of the air gap of the inductor. Magnetic thermal coupling calculation is an effective method for simulating induction heating. This paper used the finite element method to calculate the distribution of heat sources in different initial plate curvatures and coil widths. The changes in heat source distribution and its laws were investigated. The results show that when the coil width is less than 100 mm, the effect of plate curvature on heat source distribution and strain distribution is not apparent; when the coil width is greater than 100 mm, the plate curvature has a visible effect on the heat generation distribution. In the case of a curvature increasing from 0 to 1 and a coil width equal to 220 mm, the Joule heat generation in the center of the heating area is reduced by up to 21%.
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MATSUOKA, Yoshiyuki. "Shape-Generation Method Using Curvature Entropy." KANSEI Engineering International 1, n. 4 (2000): 11–18. http://dx.doi.org/10.5057/kei.1.4_11.

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Ujiie, Yoshiki, Takeo Kato, Koichiro Sato e Yoshiyuki Matsuoka. "Curvature Entropy for Curved Profile Generation". Entropy 14, n. 3 (9 marzo 2012): 533–58. http://dx.doi.org/10.3390/e14030533.

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UJIIE, Yoshiki, e Yoshiyuki MATSUOKA. "Shape Generation Method Using Curvature Entropy". Proceedings of the JSME annual meeting 2000.2 (2000): 509–10. http://dx.doi.org/10.1299/jsmemecjo.2000.2.0_509.

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UJIIE, Yoshiki, e Yoshiyuki MATSUOKA. "Shape-Generation Method Using Curvature Integration". Transactions of the Japan Society of Mechanical Engineers Series C 71, n. 702 (2005): 547–54. http://dx.doi.org/10.1299/kikaic.71.547.

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7

Berseth, Glen, Mubbasir Kapadia e Petros Faloutsos. "ACCLMesh: curvature-based navigation mesh generation". Computer Animation and Virtual Worlds 27, n. 3-4 (maggio 2016): 195–204. http://dx.doi.org/10.1002/cav.1710.

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8

Ferguson, Joshua, Cemal Cakez, Farah Hasan, Emanuele Cocucci e Comert Kural. "Curvature Generation by Endocytic Clathrin Coats". Biophysical Journal 116, n. 3 (febbraio 2019): 91a—92a. http://dx.doi.org/10.1016/j.bpj.2018.11.536.

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9

Scher-Zagier, Jonah K. "Force Generation by Curvature-Generating Molecules in Cells with Turgor". Biophysical Journal 114, n. 3 (febbraio 2018): 280a. http://dx.doi.org/10.1016/j.bpj.2017.11.1613.

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Ye, Tie Li, Lu Ling An, Li Gao e Min Wu. "Research on Sketch Contour Generation in Reverse Engineering". Applied Mechanics and Materials 16-19 (ottobre 2009): 1106–11. http://dx.doi.org/10.4028/www.scientific.net/amm.16-19.1106.

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Abstract (sommario):
The key technologies for generating sketch contours are researched on which the features such as extrusion, revolution and sweeping are reconstructed. First the planar data points are arranged in sequence by improved least distance arrangement algorithm. The feature points are extracted in terms of estimated curvatures and their changes. The types of feature points are identified by use of Adaptive K-Curvature Function. The types of planar curves are judged by Projective Height Function. On basis of feature point treatment the dividing points to segment curves are determined, which provides the foundation for constraint-based reconstruction of sketch contours in reverse engineering.
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Più fonti

Tesi sul tema "Curvature generation"

1

Sinha, Bhaskar. "Surface mesh generation using curvature-based refinement". Master's thesis, Mississippi State : Mississippi State University, 2002. http://library.msstate.edu/etd/show.asp?etd=etd-09252002-141359.

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2

Wu, Zhi-Qian. "Caveolin in membrane nanotubes : curvature sensing and bulge formation". Electronic Thesis or Diss., Université Paris sciences et lettres, 2024. http://www.theses.fr/2024UPSLS007.

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La cavéoline est l'un des principaux composants protéiques des cavéoles, qui sont de petites invaginations en forme de coupe dans la membrane plasmique. Il est synthétisé dans le réticulum endoplasmique d'une manière dépendante des particules de reconnaissance du signal et transporté vers l'appareil de Golgi via des vésicules recouvertes de COPII. Au niveau du réseau trans-Golgi (TGN), les complexes de cavéoline 8S s'oligomérisent davantage en complexes 70S avec la facilitation du cholestérol. Ils sont ensuite triés dans des transporteurs par un mécanisme inconnu et transportés vers la membrane plasmique. Le modèle structurel conventionnel de la cavéoline pourrait suggérer qu'il s'agit d'une protéine sensible à la courbure, basée sur sa forme moléculaire en épingle à cheveux. Cependant, un modèle de structure récemment découvert du complexe cavéoline 8S dans les micelles de détergent, basé sur la microscopie cryoélectronique, qui présente une géométrie de disque plat, soulève des questions sur sa sensibilité à la courbure. De plus, les cavins, un autre composant protéique majeur des cavéoles qui coopèrent avec les cavéolines pour plier la membrane pour former des cavéoles, ne s'associent pas aux cavéolines au niveau du TGN. Étant donné qu'aucun autre candidat connu, hormis les cavins, ne peut coopérer avec la cavéoline pour former des transporteurs au TGN, il devient difficile de savoir comment ces transporteurs de cavéoline y sont formés. Par conséquent, dans ce projet, nous avons cherché à élucider la sensibilité à la courbure et l’induction de la cavéoline. Nous avons résolu ces problèmes en reconstituant la cavéoline-1 (Cav1) dans la membrane de vésicules nilamellaires géantes (GUV) et en réalisant des expériences de tirage de tubes. Les résultats ont montré que la cavéoline est effectivement une protéine sensible à la courbure, les complexes de cavéoline 8S présentant une inclinaison d'environ 5 egrés par rapport à l'horizontale, ce qui leur confère une sensibilité à la courbure. De plus, nous avons montré que les complexes de cavéoline 8S peuvent générer collectivement une courbure de la membrane à basse tension et former des échafaudages sur les tubes à haute tension. En résumé, nos résultats ont montré que la cavéoline est une protéine détectant et induisant une courbure, suggérant la possibilité de son tri en transporteurs au TGN sur la base de ces propriétés. De manière intéressante, nous avons observé qu’au-dessus d’une certaine tension membranaire Tt qui dépend de la densité de Cav1, les nanotubes extraits des Cav1-GUV ne présentent plus un rayon constant et que les cavéolines forment des renflements sur le tube. Pour explorer comment Cav1 forme ces renflements, nous avons d'abord observé qu'en moyenne, la taille des renflements diminue avec l'augmentation de la tension membranaire. Nous avons constaté que la taille du renflement est proportionnelle à la quantité totale de cavéoline dans le renflement, ce qui suggère une densité Cav1 constante dans les renflements.De plus, une densité plus élevée de cavéoline dans la membrane favorise la formation de renflements et abaisse le Tt. Ces résultats suggèrent que lorsque le rayon du tube diminue, la cavéoline pourrait induire la formation de renflements pour relâcher les contraintes mécaniques dues à la géométrie tubulaire, mais un modèle et une imagerie haute résolution sont maintenant nécessaires pour expliquer ces observations
Caveolin is one of the major protein components of caveolae, which are small cup-shaped invaginations in the plasma membrane. It is synthesized in the endoplasmic reticulum in a signal recognition particle-dependent manner and transported to the Golgi apparatus via COPII-coated vesicles. At the trans-Golgi network (TGN), caveolin 8S complexes further oligomerize into 70S complexes with the facilitation of cholesterol. They are then sorted intotransport carriers through an unknown mechanism and transported to the plasma membrane. The conventional structural model of caveolin might suggest it is a curvature-sensing protein based on its hairpin molecular shape. However, a recently discovered structure model of the caveolin 8S complex in detergent micelles based on cryo-electron microscopy, which exhibits a flat disc geometry, raises questions about its curvature sensitivity.Furthermore, cavins, another major protein component of caveolae that cooperate with caveolins in bending the membrane to form caveolae, do not associate with caveolins at the TGN. Given that no other known candidate, apart from cavins, can cooperate with caveolin to form transport carriers at the TGN, it becomes unclear how these carriers for caveolin are formed there. Therefore, in this project, we aimed to elucidate the curvaturesensitivity and induction of caveolin. We addressed these issues by reconstituting caveolin-1 (Cav1) into the membrane of giant unilamellar vesicles (GUVs) and by performing tube-pulling experiments. The results showed that caveolin is indeed a curvature-sensing protein, with caveolin 8S complexes exhibiting approximately a 5 degree tilt from the horizontal, which endows them with curvature sensitivity. Furthermore, we showed that caveolin 8S complexes can collectively generate membrane curvature at low tension and form scaffolds on the tubes at high tension. In summary, our results showed that caveolin is a curvature-sensing and -inducing protein, suggesting the possibility of its sorting into transport carriers at the TGN based on these properties. Interestingly, we observed that above a certain membrane tension Tt that depends on Cav1 density, nanotubes pulled from Cav1-GUVs no longer exhibit a constant radius and that caveolins form bulges on the tube. To explore how Cav1 form these bulges, we first observed that on average, bulges' size decreases with an increase in membrane tension. We found that the bulge size is proportional to the total amount of caveolin in the bulge, suggesting a constant Cav1 density in the bulges. Additionally, higher density of caveolin in the membrane favors bulge formation and lowers Tt. These results suggest that when the tube radius decreases, caveolin might induce formation of bulges to relax mechanicalconstraints due to the tubular geometry, but a model and high resolution imaging are now needed to explain these observations
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3

Cottle, Dean J. "Mine avoidance and localization for underwater vehicles using continuous curvature path generation and non-linear tracking control". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA276070.

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Thesis (M.S. in Mechanical Engineering and Mechanical Engineer) Naval Postgraduate School, September 1993.
Thesis advisor(s): Anthony J. Healey. "September 1993." Includes bibliographical references. Also available online.
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4

Hörr, Christian, Elisabeth Lindinger e Guido Brunnett. "Considerations on Technical Sketch Generation from 3D Scanned Cultural Heritage". Universitätsbibliothek Chemnitz, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200901463.

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Drawing sketches is certainly one of the most important but at the same time elaborate parts of archaeological work. Currently, 3D scanning technology is affording a number of new applications, and only one of them is using virtual copies instead of the originals as the basis for documentation. Our major contribution are methods for automatically generating stylized images from 3D models. These are not only intuitive and easy to read but also more objective and accurate than traditional drawings. Besides some other useful tools we show several examples from our daily work proving that the system accelerates the whole documentation process considerably.
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5

Lutman, Alberto. "Impact of the wakefields and of an initial energy curvature on a Free Electron Laser". Doctoral thesis, Università degli studi di Trieste, 2010. http://hdl.handle.net/10077/3678.

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2008/2009
For an X-ray free electron laser (FEL), a high-quality electron bunch with low emittance, high peak current and energy is needed. During the phases of acceleration, bunch compression and transportation, the electron beam is subject to radio frequency curvature and to wakefields effects. Thus, the energy profile of the electron beam can present a parabolic profile, which has important electromagnetic effects on the FEL process. The quality of the electron beam is also degraded by the interaction with the low-gap undulator vacuum chamber. In our work we first analyze this interaction, deriving a formula to evaluate the longitudinal and the transversal wakefields for an elliptical cross section vacuum chamber, obtaining accurate results in the short range. Subsequently within the Vlasov-Maxwell one-dimensional model, we derive the Green functions necessary to evaluate the radiation envelope, having as initial conditions both an energy chirp and curvature on the electrons and eventually an initial bunching, which is useful to treat the harmonic generation FEL cascade configuration. This allows to study the impact of the elecron beam energy profile on the FEL performance. Using the derived Green functions we discuss FEL radiation properties such as bandwidth, frequency shift, frequency chirp and velocity of propagation. Finally, we propose a method to achieve ultra-short FEL pulses using a frequency chirp on the seed laser and a suitable electron energy profile.
XXII Ciclo
1980
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6

Gim, Suhyeon. "Flexible and Smooth Trajectory Generation based on Parametric Clothoids for Nonholonomic Car-like Vehicles". Thesis, Université Clermont Auvergne‎ (2017-2020), 2017. http://www.theses.fr/2017CLFAC023/document.

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La génération de chemins lisses pour les voitures intelligentes est l’une des conditions les plus importantes pour faire accepter et faciliter la navigation autonome de ces véhicules. Cette thèse propose plusieurs méthodes de génération de chemins lisses pour les véhicules non-holonomes qui permet une continuité intrinsèque de la courbure de navigation et offre par ailleurs une flexibilité accrue pour diverses conditions aux limites. Le chemin de courbure continue est construit en composant plusieurs clothoids, comprenant notamment des segments de lignes et/ou d’arcs, et où chaque clothoid est obtenue par une régulation appropriée de ses paramètres. À partir de ces propriétés, le chemin obtenu est nommé pCCP (parametric Continuous Curvature Path). Le pCCP fournit un diagramme de courbure qui facilite une commande en orientation du véhicule, ce qui permet d'obtenir une évolution lisse de sa trajectoire. Le problème du pCCP local est défini par des configurations initiales et finales (caractérisées pour chacune par une posture et un angle de braquage). Le problème a été étendu pour être aussi général que possible en incluant plusieurs cas. La génération locale de pCCPs, pour des cibles statiques, est spécifiquement décrite, les problèmes ont été divisés en trois problèmes et chaque problème a été décomposé par la suite en plusieurs sous-classes possibles. Pour avoir une flexibilité importante des pCCPs proposés, des cibles dynamiques ont été considérées, obtenant ainsi le dynamic-pCCP (d-pCCP). Un cadre simple mais efficace pour analyser l'état futur de l'évitement des obstacles est appliqué en configuration 4D (3D avec l’ajout d’un axe temporel) en mettant en exergue deux manoeuvres d’évitement possibles, car les évolutions avant et arrière sont appliquées et validées avec plusieurs exemples. Selon une méthodologie similaire pour atteindre les critères de performance liés à la génération des pCCPs, le h-CCP (pour human-pCCP) est proposé en utilisant des modèles expérimentaux comportementaux d’échantillons de conducteurs humains. À partir de quelques sous-expériences, le modèle de conduite humain pour l’évitement d’obstacles, les changements de voie et les mouvements en virage sont extraits et ces modèles ont été inclus pour créer ainsi le h-CCP (obtenu d’une manière similaire au pCCP mais avec différents critères d’optimisation) qui permet d’améliorer considérablement le confort des passagers
Smooth path generation for car-like vehicles is one of the most important requisite to facilitate the broadcast use of autonomous navigation. This thesis proposes a smooth path generation method for nonholonomic vehicles which has inherently continuity of curvature and having important flexibility for various boundary conditions. The continuous curvature path is constructed by composing multiple clothoids including lines and/or arc segments, and where each clothoid is obtained by parameter regulation. From those properties the path is named pCCP (parametric Continuous Curvature Path) and provides curvature diagram which facilitates a smooth steering control for path following problem. Local pCCP problem is defined by initial and final tuple configurations (vehicles posture and steering angle). The problem is expanded to be as general as possible by including several cases. The local pCCP generation for steady target pose is specifically described, where the problem is divided into three problems and each problem is also decomposed into several sub-cases. To give more flexibility to the proposed pCCP, dynamic target is considered to obtain dynamic-pCCP (d-CCP). A simple but efficient framework to analyze the future status of obstacle avoidance is applied in 4D (3D with the addition of time axis) configuration and two avoidance maneuvers as front and rear avoidance are applied and validated with several examples. Under the similar methodology in performance criteria of pCCP generation, the human-CCP (h-CCP) is derived from experimental patterns of human driver samples. From several subexperiments, human driving pattern for obstacle avoidance, lane change and cornering motion are extracted and those pattern were included to make the h-CCP (which is obtained with similar way as pCCP but with different optimization criteria) to enhance considerably the passenger comfort
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Bateman, Samuel. "Hollow core fibre-based gas discharge laser systems and deuterium loading of photonic crystal fibres". Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648951.

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Abstract (sommario):
Research towards the development of a gas-discharge fibre laser using noble gases, with target emission wavelengths in the mid-IR. Additional and separate work on gas treatment methods for managing the formation of photo-induced defects in silica glass.
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Sombra, Tiago GuimarÃes. "An adaptive parametric surface mesh generation parallel method guided by curvatures". Universidade Federal do CearÃ, 2016. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=16628.

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Abstract (sommario):
CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel Superior
This work describes a technique for generating parametric surfaces meshes using parallel computing, with distributed memory processors. The input for the algorithm is a set of parametric patches that model the surface of a given object. A structure for spatial partitioning is proposed to decompose the domain in as many subdomains as processes in the parallel system. Each subdomain consists of a set of patches and the division of its load is guided following an estimate. This decomposition attempts to balance the amount of work in all the subdomains. The amount of work, known as load, of any mesh generator is usually given as a function of its output size, i.e., the size of the generated mesh. Therefore, a technique to estimate the size of this mesh, the total load of the domain, is needed beforehand. This work makes use of an analytical average curvature calculated for each patch, which in turn is input data to estimate this load and the decomposition is made from this analytical mean curvature. Once the domain is decomposed, each process generates the mesh on that subdomain or set of patches by a quad tree technique for inner regions, advancing front technique for border regions and is finally applied an improvement to mesh generated. This technique presented good speed-up results, keeping the quality of the mesh comparable to the quality of the serially generated mesh.
Este trabalho descreve uma tÃcnica para gerar malhas de superfÃcies paramÃtricas utilizando computaÃÃo paralela, com processadores de memÃria compartilhada. A entrada para o algoritmo à um conjunto de patches paramÃtricos que modela a superfÃcie de um determinado objeto. Uma estrutura de partiÃÃo espacial à proposta para decompor o domÃnio em tantos subdomÃnios quantos forem os processos no sistema paralelo. Cada subdomÃnio à formado por um conjunto de patches e a divisÃo de sua carga à guiada seguindo uma estimativa de carga. Esta decomposiÃÃo tenta equilibrar a quantidade de trabalho em todos os subdomÃnios. A quantidade de trabalho, conhecida como carga, de qualquer gerador de malha à geralmente dada em funÃÃo do tamanho da saÃda do algoritmo, ou seja, do tamanho da malha gerada. Assim, faz-se necessÃria uma tÃcnica para estimar previamente o tamanho dessa malha, que à a carga total do domÃnio. Este trabalho utiliza-se de um cÃlculo de curvatura analÃtica mÃdia para cada patch, que por sua vez, à dado de entrada para estimar esta carga e a decomposiÃÃo à feita a partir dessa curvatura analÃtica mÃdia. Uma vez decomposto o domÃnio, cada processo gera a malha em seu subdomÃnio ou conjunto de patches pela tÃcnica de quadtree para regiÃes internas, avanÃo de fronteira para regiÃes de fronteira e por fim à aplicado um melhoramento na malha gerada. Esta tÃcnica apresentou bons resultados de speed-up, mantendo a qualidade da malha comparÃvel à qualidade da malha gerada de forma sequencial.
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Sombra, Tiago Guimarães. "Geração adaptativa de malhas de superfícies paramétricas em paralelo com controle de curvatura". reponame:Repositório Institucional da UFC, 2016. http://www.repositorio.ufc.br/handle/riufc/18667.

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Abstract (sommario):
SOMBRA, Tiago Guimarães. Geração adaptativa de malhas de superfícies paramétricas em paralelo com controle de curvatura. 2016. 71 f. Dissertação (Mestrado em ciência da computação)- Universidade Federal do Ceará, Fortaleza-CE, 2016.
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This work describes a technique for generating parametric surfaces meshes using parallel computing, with distributed memory processors. The input for the algorithm is a set of parametric patches that model the surface of a given object. A structure for spatial partitioning is proposed to decompose the domain in as many subdomains as processes in the parallel system. Each subdomain consists of a set of patches and the division of its load is guided following an estimate. This decomposition attempts to balance the amount of work in all the subdomains. The amount of work, known as load, of any mesh generator is usually given as a function of its output size, i.e., the size of the generated mesh. Therefore, a technique to estimate the size of this mesh, the total load of the domain, is needed beforehand. This work makes use of an analytical average curvature calculated for each patch, which in turn is input data to estimate this load and the decomposition is made from this analytical mean curvature. Once the domain is decomposed, each process generates the mesh on that subdomain or set of patches by a quad tree technique for inner regions, advancing front technique for border regions and is finally applied an improvement to mesh generated. This technique presented good speed-up results, keeping the quality of the mesh comparable to the quality of the serially generated mesh.
Este trabalho descreve uma técnica para gerar malhas de superfícies paramétricas utilizando computação paralela, com processadores de memória compartilhada. A entrada para o algoritmo é um conjunto de patches paramétricos que modela a superfície de um determinado objeto. Uma estrutura de partição espacial é proposta para decompor o domínio em tantos subdomínios quantos forem os processos no sistema paralelo. Cada subdomínio é formado por um conjunto de patches e a divisão de sua carga é guiada seguindo uma estimativa de carga. Esta decomposição tenta equilibrar a quantidade de trabalho em todos os subdomínios. A quantidade de trabalho, conhecida como carga, de qualquer gerador de malha é geralmente dada em função do tamanho da saída do algoritmo, ou seja, do tamanho da malha gerada. Assim, faz-se necessária uma técnica para estimar previamente o tamanho dessa malha, que é a carga total do domínio. Este trabalho utiliza-se de um cálculo de curvatura analítica média para cada patch, que por sua vez, é dado de entrada para estimar esta carga e a decomposição é feita a partir dessa curvatura analítica média. Uma vez decomposto o domínio, cada processo gera a malha em seu subdomínio ou conjunto de patches pela técnica de quadtree para regiões internas, avanço de fronteira para regiões de fronteira e por fim é aplicado um melhoramento na malha gerada. Esta técnica apresentou bons resultados de speed-up, mantendo a qualidade da malha comparável à qualidade da malha gerada de forma sequencial.
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Alves, Aylton José. "Uma modelagem da máquina síncrona considerando o efeito da curvatura da sapata polar". Universidade Federal de Uberlândia, 2011. https://repositorio.ufu.br/handle/123456789/14278.

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Abstract (sommario):
This work develops a new mathematical model to the salient pole synchronous machines (SPSM), based on the abc reference system. The model considers the distribution and coil pitch factors of windings and develops a new function for the variable air gap, generated by the curvature of the polar mass. As a result, the development of the modeling takes into account the spatial harmonic components of: magneto motive force MMF(θ)h, electromagnetic ux density B(θ)h and variation function of the air gap g(θ)h. It is also proposed a new and simplied methodology using the locked rotor tests, volt-ampere method, to obtain the constants of the synchronous machine design, which allow the calculation of the modeling parameters and the terminals magnitudes determination. It presents also contributions to traditional methods of obtaining experimental inductances, using the locked rotor test. Yet it develops procedures and makes the simulation of the main temporal magnitudes at the generator terminals connected to the utility grid, electrical torque, speed, voltage and current. The model is validated through the theoretical and experimental confrontation of inductances, and also of the voltages and currents at the generator terminals connected to the utility grid.
Este trabalho desenvolve uma nova modelagem matemática para as máquinas síncronas de polos salientes (MSPS), baseada no sistema abc de referência. A modelagem considera os fatores de distribuição e de passo de bobina dos enrolamentos e desenvolve uma nova função para o entreferro variável, gerado pela curvatura da sapata polar. Como conseqüência o desenvolvimento da modelagem leva em consideração os componentes harmônicos espaciais de: força magneto motriz FMM(θ)h, densidade de uxo eletromagnético B(θ)h e da função de variação do entreferro g(θ)h. É também proposto uma nova e simplificada metodologia a partir dos testes de rotor bloqueado, método volt-ampere, para a obtenção das constantes de projeto da máquina síncrona que possibilitam os cálculos dos parâmetros da modelagem, bem como a determinação das grandezas terminais. Também apresenta contribuições aos métodos tradicionais de obtenção de indutâncias experimentais, a partir dos testes de rotor bloqueado. Ainda desenvolve os procedimentos e faz a simulação das principais grandezas temporais nos terminais do gerador conectado à rede da concessionária: torque elétrico, velocidade, corrente e tensão. A modelagem é convalidada através das confrontações teórico-experimental das indutâncias, e também dos resultados de correntes e tensões nos terminais do gerador conetado à rede da concessionária.
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Libri sul tema "Curvature generation"

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Cottle, Dean J. Mine avoidance and localization for underwater vehicles using continuous curvature path generation and non-linear tracking control. Monterey, Calif: Naval Postgraduate School, 1993.

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Levine, Laurence A. Understanding Peyronie's disease: A treatment guide for curvature of the penis. Omaha, Neb: Addicus Books, 2007.

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Levine, Laurence A. Understanding Peyronie's disease: A treatment guide for curvature of the penis. Omaha, Neb: Addicus Books, 2007.

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Perdigão, Rui A. P. Unfolding the Manifold Flavours of Causality. Meteoceanics Institute, 2024. http://dx.doi.org/10.46337/mdsc.1804.

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The present work provides a contribution to an overarching cross-methodological causality investigation, encompassing a methodological synergy among physical, analytical, information-theoretic and systems intelligence approaches to causal discovery and quantification in complex system dynamics. These efforts methodologically lead to the emergence of a broader causal framework, valid not only in classical recurrence-based dynamical systems, but also on the generalized information physics of non-ergodic coevolutionary spatiotemporal complexity. This study begins with a comprehensive cross-examination of causality metrics derived from these diverse domains, by synthesizing causality insights from information theory, which enables the quantification of information flow among variables; differential geometry, which captures the curvature and structure of causal relationships; dynamical systems, which analyze the temporal evolution of systems and associated kinematic geometric properties; and fundamental physical metrics, which elucidate causal connections in the physical world from fundamental thermodynamic principles. Through this analysis, we aim to deepen our understanding of causality in complex systems, with physical process understanding and geophysical applications in mind. Having laid out some of the key methodological flavours of causality, the present communication introduces new metrics further contributing to a broader non-Shannonian information theoretic causality pool of methods, along with additional advances on quantum thermodymamical, nonlinear statistical mechanical, differential geometric and topologic approaches on causality. Positioning ourselves in a broader nonlinear non-Gaussian non-ergodic setting to tackle far-from-equilibrium structural-functional coevolution and synergistic emergence in complex system dynamics, our derivations further contribute to a new generation of information theoretic, dynamical systems and non-equilibrium thermodynamic causality approaches, along with their synergistic articulation towards a unified framework. This brings out further cross-methodological comparability, portability and complementary insights on dealing with the intricate causality of complex multiscale far-from-equilibrium Earth system dynamic phenomena. By unveiling manifold flavours of causality and their interconnections, this study brings out their commonalities, synergies, and further potential synergistic applications across disciplines. This interdisciplinary approach not only enhances our theoretical understanding of causality but also provides practical implications for applications in fields such as data science, network theory, and complex systems analysis, with direct relevance across a plethora of scientific, technical and operational fields.
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Capitoli di libri sul tema "Curvature generation"

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Zuo, Zheming, Jie Li e Longzhi Yang. "Curvature-Based Sparse Rule Base Generation for Fuzzy Interpolation Using Menger Curvature". In Advances in Intelligent Systems and Computing, 53–65. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-29933-0_5.

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Dassi, Franco, e Hang Si. "A Curvature-Adapted Anisotropic Surface Re-meshing Method". In New Challenges in Grid Generation and Adaptivity for Scientific Computing, 19–41. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06053-8_2.

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Pellegrin, Florian, Andre Beauchamp e Eric Paquette. "Curvature Analysis of Sculpted Hair Meshes for Hair Guides Generation". In Advances in Computer Graphics, 378–97. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89029-2_30.

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Aviv, Dorit, e Eric Teitelbaum. "Thermally Informed Bending: Relating Curvature to Heat Generation Through Infrared Sensing". In Humanizing Digital Reality, 361–71. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-6611-5_31.

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Shephard, Mark S., Saikat Dey e Marcel K. Georges. "Automatic Meshing of Curved Three—Dimensional Domains: Curving Finite Elements and Curvature-Based Mesh Control". In Modeling, Mesh Generation, and Adaptive Numerical Methods for Partial Differential Equations, 67–96. New York, NY: Springer New York, 1995. http://dx.doi.org/10.1007/978-1-4612-4248-2_5.

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Fang, Yu, Zhiming Cui, Lei Ma, Lanzhuju Mei, Bojun Zhang, Yue Zhao, Zhihao Jiang et al. "Curvature-Enhanced Implicit Function Network for High-quality Tooth Model Generation from CBCT Images". In Lecture Notes in Computer Science, 225–34. Cham: Springer Nature Switzerland, 2022. http://dx.doi.org/10.1007/978-3-031-16443-9_22.

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Hatori, Yasuhiro, Tatsuroh Mashita e Ko Sakai. "Sparseness Controls the Receptive Field Characteristics of V4 Neurons: Generation of Curvature Selectivity in V4". In Artificial Neural Networks and Machine Learning – ICANN 2013, 327–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40728-4_41.

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Lee, Michelle W., Nathan W. Schmidt e Gerard C. L. Wong. "Mechanisms of Membrane Curvature Generation by Peptides and Proteins: A Unified Perspective on Antimicrobial Peptides". In Handbook of Lipid Membranes, 141–59. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9780429194078-8.

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Özdemir, E., L. Kiesewetter, K. Antorveza, T. Cheng, S. Leder, D. Wood e A. Menges. "Towards Self-shaping Metamaterial Shells:". In Proceedings of the 2021 DigitalFUTURES, 275–85. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5983-6_26.

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AbstractDouble curvature enables elegant and material-efficient shell structures, but their construction typically relies on heavy machining, manual labor, and the additional use of material wasted as one-off formwork. Using a material’s intrinsic properties for self-shaping is an energy and resource-efficient solution to this problem. This research presents a fabrication approach for self-shaping double-curved shell structures combining the hygroscopic shape-changing and scalability of wood actuators with the tunability of 3D-printed metamaterial patterning. Using hybrid robotic fabrication, components are additively manufactured flat and self-shape to a pre-programmed configuration through drying. A computational design workflow including a lattice and shell-based finite element model was developed for the design of the metamaterial pattern, actuator layout, and shape prediction. The workflow was tested through physical prototypes at centimeter and meter scales. The results show an architectural scale proof of concept for self-shaping double-curved shell structures as a resource-efficient physical form generation method.
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Ruuth, Steven J. "An algorithm for generating motion by mean curvature". In ICAOS '96, 82–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/3-540-76076-8_120.

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Atti di convegni sul tema "Curvature generation"

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Ujiie, Yoshiki, e Yoshiyuki Matsuoka. "Shape-Generation Method Using Curvature Entropy". In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1054.

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Abstract Curvature entropy can express “complexity” characteristics in a simple curve profile. A shape-generation method using curvature entropy and genetic algorithm is described. Application of this method to the design of an automobile side view showed that curvature entropy can express characteristics in a curve profile at the product level. A design-support system using curvature entropy is thus feasible.
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Zhu, Qi, Xiaohui Li, Daxue Liu, Zhenping Sun e Bin Dai. "A boundary-curvature-aware and continuous-curvature path generation method for car-like robots". In 2016 35th Chinese Control Conference (CCC). IEEE, 2016. http://dx.doi.org/10.1109/chicc.2016.7554361.

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Tian, Yu, Zhang Chen, Chuanyi Xue, Yiyong Sun e Bin Liang. "Continuous Curvature Turns Based Method for Least Maximum Curvature Path Generation of Autonomous Vehicle". In IECON 2021 - 47th Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2021. http://dx.doi.org/10.1109/iecon48115.2021.9589723.

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Zhang, Dongdong, Pinghai Yang e Xiaoping Qian. "Adaptive NC Path Generation From Massive Point Data With Bounded Error". In ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/detc2008-49626.

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This paper presents an approach for generating curvature-adaptive finishing tool paths with bounded error directly from massive point data in three-axis CNC milling. This approach uses the Moving Least Squares (MLS) surface as the underlying surface representation. A closed-form formula for normal curvature computing is derived from the implicit form of MLS surfaces. It enables the generation of curvature-adaptive tool paths from massive point data that is critical for balancing the trade-off between machining accuracy and speed. To ensure the path accuracy and robustness for arbitrary surfaces where there might be abrupt curvature change, a novel guidance field algorithm is introduced. It overcomes potential excessive locality of curvature-adaptive paths by examining the neighboring points’ curvature within a self-updating search bound. Our results affirm that the combination of curvature-adaptive path generation and the guidance field algorithm produces high-quality NC paths from a variety of point cloud data with bounded error.
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Bakolas, Efstathios, e Panagiotis Tsiotras. "On the generation of nearly optimal, planar paths of bounded curvature and bounded curvature gradient". In 2009 American Control Conference. IEEE, 2009. http://dx.doi.org/10.1109/acc.2009.5160269.

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Chen, Binglin, Wenbing Fan, Yao Wang e Juin Jie Liou. "A 8.9 ppm/°C Voltage Reference with Piecewise Curvature Compensation". In 2022 10th International Symposium on Next-Generation Electronics (ISNE). IEEE, 2023. http://dx.doi.org/10.1109/isne56211.2023.10221644.

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Belyaev, A. G., E. V. Anoshkina e S. Yoshizawa. "Nonlinear spline generation with curve evolutions driven by curvature". In Proceedings Shape Modeling International '99. International Conference on Shape Modeling and Applications. IEEE, 1999. http://dx.doi.org/10.1109/sma.1999.749334.

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Gao, Zhi, Yuwei Wu, Yunde Jia e Mehrtash Harandi. "Curvature Generation in Curved Spaces for Few-Shot Learning". In 2021 IEEE/CVF International Conference on Computer Vision (ICCV). IEEE, 2021. http://dx.doi.org/10.1109/iccv48922.2021.00857.

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Haq, M. Z. "Developing Turbulence on the Propagation of Flames in Methane-Air Premixture". In International Joint Power Generation Conference collocated with TurboExpo 2003. ASMEDC, 2003. http://dx.doi.org/10.1115/ijpgc2003-40143.

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In spark ignition engines, initial flame kernel is wrinkled by a progressively increasing bandwidth of turbulence length scales until eventually the size of the flame kernel is sufficient for it to experience the entire turbulence spectrum. In the present study, an effective r.m.s. turbulence velocity as a function of time, estimated by integrating the non-dimensional power spectrum density function for isotropic turbulence, is utilized in the analysis of the statistical distribution of flame front curvatures and turbulent burning velocities of flames propagating in methane-air premixtures. The distribution of flame front curvatures shows these to become more dispersed as the effective turbulence velocity increases, and results in increased burning of premixtures. A decrease in the Markstein number also results in a further increase in curvature dispersion and enhanced burning, in line with the flame stability analysis.
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Siswantara, Mohamad Arif A., Ratih Julistina e Harijono Djojodihardjo. "Influence of Coandă Blanket Curvature on Coandă MAV Lift Generation Performance". In AIAA Scitech 2021 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2021. http://dx.doi.org/10.2514/6.2021-0964.

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Rapporti di organizzazioni sul tema "Curvature generation"

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Anderson, Gerald L., e Kalman Peleg. Precision Cropping by Remotely Sensed Prorotype Plots and Calibration in the Complex Domain. United States Department of Agriculture, dicembre 2002. http://dx.doi.org/10.32747/2002.7585193.bard.

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This research report describes a methodology whereby multi-spectral and hyperspectral imagery from remote sensing, is used for deriving predicted field maps of selected plant growth attributes which are required for precision cropping. A major task in precision cropping is to establish areas of the field that differ from the rest of the field and share a common characteristic. Yield distribution f maps can be prepared by yield monitors, which are available for some harvester types. Other field attributes of interest in precision cropping, e.g. soil properties, leaf Nitrate, biomass etc. are obtained by manual sampling of the filed in a grid pattern. Maps of various field attributes are then prepared from these samples by the "Inverse Distance" interpolation method or by Kriging. An improved interpolation method was developed which is based on minimizing the overall curvature of the resulting map. Such maps are the ground truth reference, used for training the algorithm that generates the predicted field maps from remote sensing imagery. Both the reference and the predicted maps are stratified into "Prototype Plots", e.g. 15xl5 blocks of 2m pixels whereby the block size is 30x30m. This averaging reduces the datasets to manageable size and significantly improves the typically poor repeatability of remote sensing imaging systems. In the first two years of the project we used the Normalized Difference Vegetation Index (NDVI), for generating predicted yield maps of sugar beets and com. The NDVI was computed from image cubes of three spectral bands, generated by an optically filtered three camera video imaging system. A two dimensional FFT based regression model Y=f(X), was used wherein Y was the reference map and X=NDVI was the predictor. The FFT regression method applies the "Wavelet Based", "Pixel Block" and "Image Rotation" transforms to the reference and remote images, prior to the Fast - Fourier Transform (FFT) Regression method with the "Phase Lock" option. A complex domain based map Yfft is derived by least squares minimization between the amplitude matrices of X and Y, via the 2D FFT. For one time predictions, the phase matrix of Y is combined with the amplitude matrix ofYfft, whereby an improved predicted map Yplock is formed. Usually, the residuals of Y plock versus Y are about half of the values of Yfft versus Y. For long term predictions, the phase matrix of a "field mask" is combined with the amplitude matrices of the reference image Y and the predicted image Yfft. The field mask is a binary image of a pre-selected region of interest in X and Y. The resultant maps Ypref and Ypred aremodified versions of Y and Yfft respectively. The residuals of Ypred versus Ypref are even lower than the residuals of Yplock versus Y. The maps, Ypref and Ypred represent a close consensus of two independent imaging methods which "view" the same target. In the last two years of the project our remote sensing capability was expanded by addition of a CASI II airborne hyperspectral imaging system and an ASD hyperspectral radiometer. Unfortunately, the cross-noice and poor repeatability problem we had in multi-spectral imaging was exasperated in hyperspectral imaging. We have been able to overcome this problem by over-flying each field twice in rapid succession and developing the Repeatability Index (RI). The RI quantifies the repeatability of each spectral band in the hyperspectral image cube. Thereby, it is possible to select the bands of higher repeatability for inclusion in the prediction model while bands of low repeatability are excluded. Further segregation of high and low repeatability bands takes place in the prediction model algorithm, which is based on a combination of a "Genetic Algorithm" and Partial Least Squares", (PLS-GA). In summary, modus operandi was developed, for deriving important plant growth attribute maps (yield, leaf nitrate, biomass and sugar percent in beets), from remote sensing imagery, with sufficient accuracy for precision cropping applications. This achievement is remarkable, given the inherently high cross-noice between the reference and remote imagery as well as the highly non-repeatable nature of remote sensing systems. The above methodologies may be readily adopted by commercial companies, which specialize in proving remotely sensed data to farmers.
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