Thematische Bibliographien / Guides à modes lents

Auswahl der wissenschaftlichen Literatur zum Thema „Guides à modes lents“

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Veröffentlicht am 20. Juli 2024

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Zeitschriftenartikel zum Thema "Guides à modes lents"

1

Elissalde, Bernard. „Guides, modes d'emploi“. Espaces Temps 33, Nr. 1 (1986): 27–30. http://dx.doi.org/10.3406/espat.1986.3316.

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2

Vassallo, Charles. „Pseudo-modes et guides optiques“. Annales des Télécommunications 43, Nr. 1-2 (Januar 1988): 48–65. http://dx.doi.org/10.1007/bf02995071.

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3

Egorov, A. A., K. P. Lovetsky, A. L. Sevastianov und L. A. Sevastianov. „Thin-film waveguide L¨uneburg lens in the model of adiabatic guided modes“. Mathematical Modelling and Geometry 11, Nr. 2 (02.11.2023): 1–12. http://dx.doi.org/10.26456/mmg/2023-1121.

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A mathematical model is presented that describes the processes of propagation and transformation of coherent electromagnetic radiation in a multilayer three-dimensional (3D) smoothly irregular integrated optical waveguide, called the model of adiabatic guided modes. Its presentation and individual applications in smoothly irregular integrated optical waveguides contain two short stories: • two-dimensional evolution of guided modes is described; • boundary conditions are formed on non-horizontal planes tangent to media interfaces, which lead to the description of hybridization of guided modes and other interesting phenomena. The model of adiabatic guided modes generalizes the cross-section method (reference waveguide method) with nonlocal boundary conditions for the transverse guided mode operator in the reference waveguide cross section to the case of twodimensional evolution, leading to the description of a number of new effects.
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4

Istomin, A. B., A. V. Lyubimtseva und V. O. Dmitriev. „Research of linear guides of metal-cutting machines“. Glavnyj mekhanik (Chief Mechanic), Nr. 11 (01.11.2020): 53–65. http://dx.doi.org/10.33920/pro-2-2011-08.

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The article discusses the guides used in metal-cutting machines. The advantages and disadvantages of sliding guides with different modes of friction and rolling guides with different types of rolling bodies are studied in detail. Recommendations for using each type of guide are given, and examples are considered.
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5

Linton, C. M., M. McIver, P. McIver, K. Ratcliffe und J. Zhang. „Trapped modes for off-centre structures in guides“. Wave Motion 36, Nr. 1 (Juni 2002): 67–85. http://dx.doi.org/10.1016/s0165-2125(02)00006-9.

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6

Bonnet, A. „Guided modes of integrated optical guides. A mathematical study“. IMA Journal of Applied Mathematics 60, Nr. 3 (01.06.1998): 225–61. http://dx.doi.org/10.1093/imamat/60.3.225.

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7

Ruppen, Hans-Jörg. „Multiple TE-modes for planar, self-focusing wave guides“. Annali di Matematica Pura ed Applicata 172, Nr. 1 (Dezember 1997): 323–77. http://dx.doi.org/10.1007/bf01782618.

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8

Helke, Christian, Markus Reinhardt, Markus Arnold, Falk Schwenzer, Micha Haase, Matthias Wachs, Christian Goßler et al. „On the Fabrication and Characterization of Polymer-Based Waveguide Probes for Use in Future Optical Cochlear Implants“. Materials 16, Nr. 1 (22.12.2022): 106. http://dx.doi.org/10.3390/ma16010106.

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Improved hearing restoration by cochlear implants (CI) is expected by optical cochlear implants (oCI) exciting optogenetically modified spiral ganglion neurons (SGNs) via an optical pulse generated outside the cochlea. The pulse is guided to the SGNs inside the cochlea via flexible polymer-based waveguide probes. The fabrication of these waveguide probes is realized by using 6” wafer-level micromachining processes, including lithography processes such as spin-coating cladding layers and a waveguide layer in between and etch processes for structuring the waveguide layer. Further adhesion layers and metal layers for laser diode (LD) bonding and light-outcoupling structures are also integrated in this waveguide process flow. Optical microscope and SEM images revealed that the majority of the waveguides are sufficiently smooth to guide light with low intensity loss. By coupling light into the waveguides and detecting the outcoupled light from the waveguide, we distinguished intensity losses caused by bending the waveguide and outcoupling. The probes were used in first modules called single-beam guides (SBGs) based on a waveguide probe, a ball lens and an LD. Finally, these SBGs were tested in animal models for proof-of-concept implantation experiments.
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9

Бишутин, Сергей, und Sergey Bishutin. „Quality and wear-resistance of friction surfaces in extended cylindrical guides after combined anti-friction treatment“. Science intensive technologies in mechanical engineering 2018, Nr. 11 (08.12.2018): 19–24. http://dx.doi.org/10.30987/article_5bd8aa88d29f01.40920939.

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The results of investigations of surface quality and wear-resistance in extended cylindrical guides worked according to a new technology of anti-friction treatment are shown. The design of a combined tool developed is considered. There are presented technological modes of surface treatment and the results of tribo-technical tests of guides.
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Barnes, C., B. L. Johnson und G. Kirczenow. „Introducing directionality to Anderson localization: The transport properties of quantum railroads“. Canadian Journal of Physics 72, Nr. 9-10 (01.09.1994): 559–67. http://dx.doi.org/10.1139/p94-071.

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We present a study of the transport properties of a general class of quantum mechanical wave guides: quantum railroads (QRR). These wave guides are characterized by having adiabatic modes that carry current along the wave guide in opposite directions; for example N forward modes and M reverse modes. Anderson localization and the integer quantum Hall effect are characteristic of the disordered N = M and M = 0 cases, respectively. We consider the general case of arbitrary N and M, and show that it can be understood in terms of directed localization. Thus, we unify the theories of Anderson localization and the integer quantum Hall effect and demonstrate how they fit into a broader conceptual framework. We find that in any QRR there are always [Formula: see text] perfectly transmitted effective adiabatic modes with the remainder being subject to multiple scattering and interference effects characteristic of the N = M case.
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Dissertationen zum Thema "Guides à modes lents"

1

Mahapatra, Sukanya. „Developing slow-mode nanophotonic platform for strong interaction between cold Rb atoms and guided photons“. Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP022.

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Cette thèse présente les résultats de recherche obtenues au course de ma thèse portant sur la conception, la fabrication et les premières caractérisations optiques de guides d’ondes à cristal photonique à mode lent à base de GaInP, destinés à la forte interaction des photons guidés avec la transition D₂ (780 nm) des atomes de ⁸⁷Rb. L’approche choisie implique le couplage des atomes au mode optique guidé, un concept appelé électrodynamique quantique en guide d’ondes (QED en guide d’ondes). Les guides d’ondes à cristal photonique ont été conçus avec une ingénierie de dispersion pour atteindre un mode lent ayant des indices de groupe élevés (∼ 30 - 50) autour de 780 nm. La conception, la tolérance de fabrication a été prise en compte pour garantie un mode lent sur une bande d’environ 10 nm. Le guide d’ondes est destiné à être suspendu, permettant ainsi un espace libre autour de lui pour faciliter le transport des atomes à proximité et le couplage de la lumière depuis une source laser externe. Les détails sur le processus de nanofabrication optimisé et reproductible sont donnés dans cette thèse. Les défis rencontrés lors de la fabrication et les solutions apportées ont été abordés, suivis d’une analyse des résultats de la fabrication des nanostructures. Une caractérisation optique préliminaire des guides d’ondes a été réalisée, au cours de laquelle les spectres de transmission de différentes nanostructures ont été mesurés
This thesis presents the results of my PhD research on the design, fabrication, and first optical characterisation of GaInP-based slow-mode nanophotonic waveguides intended for the strong interaction of guided photons with the D₂ transition (780 nm) of ⁸⁷Rb atoms. The approach involves coupling atoms to the guided mode of a waveguide, a concept referred to as Waveguide Quantum Electrodynamics (Waveguide QED). The photonic crystal waveguides were designed with dispersion engineering to achieve slow mode with high group indices (∼30 - 50) around 780 nm. In the design, fabrication tolerance has been addressed by ensuring guided mode over a bandwidth of ∼10 nm. The waveguide is intended to be suspended, allowing free space around its vicinity to facilitate the convenient transport of atoms to its proximity and easy coupling of light from an external laser source. Details on an optimized and reproducible nanofabrication process have been reported. The encountered fabrication challenges and the corresponding solutions have been addressed, followed by an analysis of the fabrication results. A preliminary optical characterisation of the waveguides was conducted, in which the transmission spectra featuring the guided mode around 780nm were observed
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2

Zang, Xiaorun. „Lumière lente dans les guides à cristaux photoniques pour l'interaction renforcée avec la matière“. Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0172/document.

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Dans cette thèse, nous avons étudié l'impact considérable de désordre aléatoire sur le transport de la lumière lente dans les guides à cristaux photoniques 1D, c'est-à-dire la localisation de la lumière. Les mesures en champ proche, les simulations statistiques et le modèle théorique révèlent l'existence d'une limite inférieure de l’extension spatiale des modes localisés. Nous avons également présenté que le niveau de désordre et l’extension spatiale de mode localisé individuelle sont liés par la masse effective de photons plutôt que la vitesse de groupe considérant en général.Deuxièmement, les systèmes hybrides d'atomes froids et des guides à cristaux photoniques ont été reconnus comme un approche prometteuse pour l'ingénierie grande interaction lumière-matière au niveau des atomes et des photons individuels. Dans cette thèse, nous avons étudié la physique, à savoir le transport de la lumière dans des guides de nanophotonique périodiques couplées à des atomes à deux niveaux. Notre expression semi-analytique développée est générale et peut rapidement caractériser le couplage entre les atomes froids et les photons guidées. Pour surmonter les difficultés techniques considérables existent dans les systèmes hybrides atomique et photonique, nous avons conçu un guide nanophotonique qui supporte un mode de Bloch lente guidée avec grande queue évanescente dans l'espace libre pour les atomes froids de piégeage. Pour adapter précisément la région de fréquence de la lumière lente du mode guidé à la ligne de transition atomique, nous avons conçu la bande photonique et de la courbe de dispersion du mode guidé afin que la force de l'interaction est robuste contre imprévisible fabrication imperfection
In this thesis, we firstly investigated the striking influence of random disorder on light transport near band edges in one dimensional photonic crystal wave guides, i.e. light localization. Near-field measurements, statistical simulations and theoretical model revealed the existence of a lower bound for the spatial extent of localized modes. We also showed that the disorder level and the spatial extent of individual localized mode is linked by the photon effective mass rather than the generally considered group velocity. Secondly, hybrid cold atoms and photonic crystal wave guides system have been recognized as a promising paradigm for engineering large light-matter interaction at single atoms and photons level. In this thesis, we studied the basic physics, i.e. light transport in periodic nanophotonic wave guides coupled to two-level atoms. Our developed general semi-analytical expression can quickly characterize the coupling between cold atoms and guided photons. Aim to overcome the significant technical challenges existed for developing hybrid atom-photonic systems, we designed a nanophotonic waveguide, which supports a slow guided Bloch mode with large evanescent tail in free space for cold atoms trapping (release the limitation imposed by Casmir Polder force and technical challenge of nanoscale manipulation of cold atoms). To match precisely the slow light region of the guided mode to the atomic transition line, we carefully engineered the photonic band and the dispersion curve (i.e.flatness) of the guided mode so that the interaction strength is robust against unpredictable fabrication imperfection
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Latry, Olivier. „Théorie des modes locaux dans les guides perturbés application : couplage fibre optique - photodiode PIN“. Rouen, 1995. http://www.theses.fr/1995ROUE5001.

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La réduction des dimensions des composants optoélectroniques constitue une contrainte importante pour un couplage optimal avec la fibre optique. Le but recherché étant de focaliser le maximum de lumière à l'intérieur de la couche intrinsèque de la photodiode, il faudrait donc envisager de réduire le diamètre de la fibre optique. Une étude du bout de la fibre est également menée et montre que pour une forme lentillée appropriée, il est possible d'adapter la distribution d'énergie entre fibre optique et photodiode. Le calcul du champ le long de ce guide de dimensions lentement décroissantes utilise la méthode des modes locaux. Cette méthode est employée car il n'y a pas de solutions exactes aux équations de Maxwell. En réalité, le champ total est la superposition des champs locaux et du champ radiatif. Les pertes d'énergie le long de ce guide sont analysées avec la théorie du couplage des modes locaux. On obtient alors un bilan le long de ce guide que l'on cherche à optimiser. La comparaison de ces résultats avec la simulation numérique quasi 3 D de la propagation optique guidée sur ALCOR est également réalisée. Ceci permet de définir la structure la mieux adaptée pour un couplage optimum entre la fibre et le composant
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Ferrier, Lydie. „Micro-nano structures à base de cristaux photoniques pour le contrôle 3D de la lumière“. Phd thesis, Ecole Centrale de Lyon, 2008. http://tel.archives-ouvertes.fr/tel-00625602.

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Le contrôle 3D de la lumière est réalisé, à l'échelle de la longueur d'onde, dans des circuits photoniques intégrés. La brique élémentaire choisie dans cette étude est le cristal photonique (CP) membranaire qui, par ses propriétés de dispersion, permet un contrôle de la lumière à la fois dans le plan (optique guidée) et hors du plan (dispositifs adressables par la surface). En particulier, l'exploitation de modes de Bloch situés au point Gamma de la courbe de dispersion (k//=0) permet l'émission de la lumière dans la direction verticale. Dans cette étude, nous nous sommes focalisés sur des cristaux photoniques à réseaux de micropiliers, comme alternative aux réseaux de trous, mais également en envisageant la possibilité d'intégrer ces structures dans des systèmes microfluidiques, les fluides ayant la capacité de circuler au travers des réseaux de piliers. Nous décrirons dans une première partie, des dispositifs à CP à émission par la surface. Nous démontrerons, pour la première fois, que l'utilisation de modes fortement résonants permet de réaliser des microlasers à réseaux de piliers en InP. Les modes faiblement résonants peuvent être utilisés pour la réalisation de miroirs à CP et de microcavités Fabry-Pérot constituées uniquement de tels miroirs. Les facteurs de qualité obtenus (>10000) rendent possible la fabrication de nouveaux types de VCSEL. Dans une seconde partie, nous nous intéresserons à la problématique de l'intégration de ces dispositifs dans un circuit photonique 3D. Tout d'abord, nous expliquerons comment il est possible d'optimisation le diagramme de rayonnement des composants. Ensuite, nous étudierons le couplage de dispositifs à cristaux photoniques avec un ou deux guides d'onde ruban en silicium. De fortes efficacités de couplage sont obtenues en simulation FDTD 3D (95%). Ces dispositifs en cours de fabrication en collaboration avec le LETI-CEA de Grenoble permettront de démontrer expérimentalement ce couplage.
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Faggiani, Rémi. „Resonant nanophotonics : structural slow light and slow plasmons“. Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0396/document.

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L'augmentation de l'interaction lumière-matière aux échelles micro et nanométriques est un des fers de lance de la nanophotonique. En effet, le contrôle de la répartition spatiale de la lumière grâce à l'interaction résonante entre nanostructures et ondes électromagnétiques a conduit aux développements de nombreuses applications dans des domaines variés tels que les télécommunications,la spectroscopie et la détection d'objets. Le ralentissement de la lumière, sujet de la thèse, obtenue grâces à l'interférence d'ondes contre-propageantes dans des milieux périodiques ou le confinement sub-longueur d'onde dans des guides d'ondes plasmoniques, est associé à une compression des pulses lumineux et une forte augmentation du champ électrique, deux phénomènes clés pour la miniaturisation de composées optiques et l'augmentation de l'interaction lumière matière
Enhancing light-matter interactions at micro and nanoscales is one of the spearheads of nanophotonics. Indeed, the control of the field distribution due to the resonant interaction of nanostructures with electromagnetic waves has prompted the development of numerous optical components for many applications in telecommunication, spectroscopy or sensing. A promising approach lies in the control of light speed in nanostructures. Light slowdown, obtained by wave interferences in periodic structures or subwavelength confinement in plasmonic waveguides, is associated to pulse compressions and large field enhancements,which are envisioned as key processes for the miniaturization of optical devices and the enhancement of light-matter interactions.The thesis studies both fundamental aspects and possible applications related to slow light in photonic and plasmonic nanostructures. In particular, we study the impact of periodic system sizes on the group velocity reduction and propose a novelfamily of resonators that implement slow light on very small spatial scales. We then investigate the role of fabrication disorder in slow periodic waveguides on light localization and demonstrate how modal properties influence the confinement of localized modes. Also we propose a new hollow-core photonic crystal waveguide that provides efficient and remote couplings between the waveguide and atoms thatare trapped away from it. Finally we demonstrate the important role played by slow plasmons on the emission of quantum emitters placed in nanogap plasmonic antennas and explain how large radiation efficiency can be achieved by overcoming quenching in the metal. Additionally, one part of the thesis is devoted to thederivation of a novel modal method to accurately describe the dynamics of plasmonic resonators under short pulse illumination
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Gerelli, Emmanuel. „Nanopinces optiques à base de modes de Bloch lents en cavité“. Phd thesis, INSA de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00838792.

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Ce travail de thèse s'inscrit dans les efforts actuellement réalisés, pour améliorer l'efficacité des pinces optiques conventionnelles qui permettent de manipuler sans contact des objets de quelques dizaines de nanomètres à quelques dizaines de micromètres avec une extrême précision et trouvent de nombreuses applications en biophysique et sciences de colloïdes.L'objectif de cette thèse a été d'explorer une nouvelle approche pour la réalisation de Nanopinces Optiques. Elle s'appuie sur l'utilisation de cavités à cristaux photoniques à modes de Bloch lents. Ces cavités peuvent être efficacement et facilement excitées par un faisceau Gaussien à incidence normale. Contrairement aux pinces optiques conventionnelles, des objectifs à faibles ouvertures numériques peuvent être utilisés. Les performances attendues en termes de piégeage vont bien au-delà de limitations imposées par la limite de diffraction pour les pinces conventionnelles. Ce travail démontre expérimentalement l'efficacité de l'approche. Cette thèse comporte deux parties principales. Dans un premier temps, il a fallu monter un banc expérimental pour mener nos études. Nous avons construit un banc optique, interfacé les instruments, et développé des applications logicielles pour analyser les données. Deux éléments importants ont présidé à sa construction : - Le développement d'un système optique permettant d'exciter les nanostructures photoniques - la conception d'un système d'imagerie pour suivre les nanoparticules. La seconde partie de ce travail a porté sur la mise en évidence du piégeage optique à l'aide de nanostructure à base de cristaux photonique. Nous avons d'abord montré que même des cavités possédant des coefficients de qualités modérés (quelques centaines) permettait d'obtenir des pièges optiques dont l'efficacité est d'un ordre de grandeur supérieur à celui de pinces conventionnels. Fort de ce résultat, nous avons exploré un nouveau type de cavité à cristaux photoniques s'appuyant sur une approche originale : des structures bi-périodiques. Nous avons montré qu'à l'aide de cette approche des facteurs de qualités de l'ordre de plusieurs milliers étaient facilement atteignable. A l'aide de ces nouvelles structures, nous sommes arrivés aux résultats le plus important de ce travail : le piégeage de nanoparticules de 250nm de rayon avec une puissance optique incidente de l'ordre du milliwatt. Une analyse fine du mouvement de la nanoparticule, nous a permis de trouver la signature du mode de Bloch lent.
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Knoesen, André. „Guided modes in anisotropic dielectric planar waveguides“. Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/14898.

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8

Perségol, Dominique. „Réalisation d'un modulateur électrooptique utilisant l'excitation résonnante des modes guides“. Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37617533m.

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9

ECKERLE, MICHAEL. „Couplage des modes dans les guides d'ondes optiques multimodes et applications“. Université Louis Pasteur (Strasbourg) (1971-2008), 1994. http://www.theses.fr/1994STR13189.

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Les proprietes de couplage de modes dans les guides ondes optique multimode cylindrique a saut d'indice (gom) comme des fibres optiques se presentent ici sous forme de matrices de transfert. On propose un modele pour ces matrices de transfert de puissances et d'intensites et des criteres de mesures deduits conduisent a un analyseur de couplage de modes operationnels. Les resultats experimentaux ainsi obtenus prouvent la validite du modele. Des premieres analyses des gom micro-courbees menent a des resultats sensationnels. La grande resolution des matrices de transfert donne une impression rapide et detaillee des proprietes de couplages de mode. Il est possible de mesurer des matrices de transfert des gom dans toutes sortes de configurations, par exemple des fibres micro-courbees, bobinees, tordues, torsadees ou sous forme de connecteurs et de coupleurs. Pour conclure, l'analyseur de couplages de modes s'avere un outil ideal pour le developpement, la conception de capteur a fibres optiques et pour la verification des theories sur les couplages des modes dans les gom
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Bonnet, Anne-Sophie. „Analyse mathematique de la propagation de modes guides dans les fibres optiques“. Paris 6, 1988. http://www.theses.fr/1988PA066093.

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L'etude de la propagation d'ondes guidees dans des structures dielectriques cylindriques (fibres optiques en particulier) est un probleme vectoriel, susceptible de se reduire a un probleme scalaire dans le cadre de l'approximation dite de "faible guidage". La premiere partie traite de la partie vectorielle, la seconde, de la partie scalaire. Dans ces deux parties sont etudiees la relation de dispersion en fonction du profil d'indice de refraction
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Bücher zum Thema "Guides à modes lents"

1

Black, Richard J. Optical waveguide modes: Polarization, coupling, and symmetry. New York: McGraw-Hill, 2010.

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Black, Richard J. Optical waveguide modes: Polarization, coupling, and symmetry. New York: McGraw-Hill, 2010.

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3

Mallender, Ariane. ABC de la rédaction technique: Modes d'emploi, notices d'utilisation, aides en lignes. Paris: Dunod, 2002.

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K, Dominek Allen, und Lewis Research Center, Hrsg. Constitutive parameter de-embedding using inhomogeneously-filled rectangular waveguides with longitudinal section modes. Columbus, Ohio: Ohio State University, ElectroScience Laboratory, Dept. of Electrical Engineering, 1990.

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Barouch, Gilles. Élaborer des objectifs et un tableau de bord de suivi: Voici les modes d'emploi ! : TPE-PME. La Plaine-Saint-Denis: Afnor éd., 2009.

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Theoretical, experimental, and computational evaluation of disk-loaded circular wave guides. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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7

Gray, Kevin, und Susan Francis Gray. 9. Other modes of acquisition. Oxford University Press, 2013. http://dx.doi.org/10.1093/he/9780199603794.003.0009.

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Titles in the Core Text series take the reader straight to the heart of the subject, providing focused, concise, and reliable guides for students at all levels. This chapter examines other ways by which interests in land may be acquired, which include adverse possession; proprietary estoppel; and succession and donatio mortis causa.
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Jeffs, Kathleen. The Impact of the RSC’s Spanish Golden Age Season. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198819349.003.0007.

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The RSC’s groundbreaking 2004–5 season had a tremendous impact on the development of the comedia within the English-speaking theatrical landscape in the years that followed the performances. All through the process, the model of collaboration between the directors, translators, and academic consultants grew and continued to bear fruit. This chapter, written over ten years after the close of the RSC Spanish Golden Age season, examines that season’s influence on the subsequent productions it inspired. The model of collaboration between the team members took on various guises throughout the new productions that have come and gone since the close of the RSC season, and looking back through the lens of experience of that season gives a unique perspective on the work as it has evolved.
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Brown, Quisha. Racial Equity Lens Logic Model and Theory of Change: A Step by Step Guide to Help Organizations Become More Confident in Their Ability to Demonstrate Outcomes. Independently Published, 2021.

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Zeitlin, Vladimir. Resonant Wave Interactions and Resonant Excitation of Wave-guide Modes. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198804338.003.0012.

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The idea of resonant nonlinear interactions of waves, and of resonant wave triads, is first explained using the example of Rossby waves, and then used to highlight a mechanism of excitation of wave-guide modes, by impinging free waves at the oceanic shelf, and at the equator. Physics and mathematics of the mechanism, which is related to the phenomena of parametric resonance and wave modulation, are explained in detail in both cases. The resulting modulation equations, of Ginzburg–Landau or nonlinear Schrodinger type, are obtained by multi-scale asymptotic expansions and elimination of resonances, after the explanation of this technique. The chapter thus makes a link between geophysical fluid dynamics and other branches of nonlinear physics. A variety of nonlinear phenomena including coherent structure formation is displayed. The resonant excitation of wave-guide modes provides an efficient mechanism of energy transfer to the wave guides from the large to the small.
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Buchteile zum Thema "Guides à modes lents"

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Alda, Javier. „Exact Optics“. In Intraocular Lens Calculations, 103–20. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-50666-6_4.

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AbstractThe geometrical and physical models of optics describe the behavior of light in image-forming optical systems. In this chapter, we first analyze the limitations and constraints of paraxial geometrical optics and describe geometrical aberrations. Optical aberrations can be expressed in terms of wavefront aberrations due to the wave nature of light. Hence, this model provides us with figures of merit that describe the quality of optical systems in terms of their capability to produce faithful images. As a consequence, we will show how diffraction ultimately limits the performance of optical systems. We will analyze the human eye as an example to understand this model further. These formalisms can generate personalized models of the eye—if we include patient’s parameters obtained from aberrometers, corneal topography, and pachymetry—and guide the selection of intra-ocular lenses for optimum visual performance.
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McIver, P. „Approximations to Embedded Trapped Modes in Wave Guides“. In IUTAM Symposium on Diffraction and Scattering in Fluid Mechanics and Elasticity, 79–86. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-017-0087-0_9.

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Kartchevski, Evgueni, und George Hanson. „Mathematical Analysis of the Guided Modes of Integrated Optical Guides“. In Mathematical and Numerical Aspects of Wave Propagation WAVES 2003, 445–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-55856-6_71.

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Verghis, Sharuna. „Citizenship and Legal Status in Healthcare: Access of Non-citizens in the ASEAN: A Comparative Case Study of Thailand and Malaysia“. In IMISCOE Research Series, 115–34. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-25748-3_7.

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AbstractThe international movement of people through voluntary migration and forced displacement in the ASEAN is driven by economic inequalities within and between countries, and political and ethnic conflict. Using case examples of Malaysia and Thailand which espouse the neoliberal model of migration and development, and which are both guided by concerns of national security and economic efficiency in healthcare, this chapter appraises their contrasting models of health systems in the way healthcare access of migrant populations is conceptualised. Examining this issue from a comparative foundation and exploring the entitlement of a range of non-citizens to healthcare through the lens of documentation status, citizenship, and moral deservingness, this chapter demonstrates how borders move within national boundaries as neoliberal policies influence the normative frameworks underpinning health systems and the access of non-citizens to healthcare.
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Frimpong Boamah, Emmanuel. „A Polycentric Vision for Governing the Urban Food Commons“. In Urban Agriculture, 121–41. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-32076-7_7.

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AbstractThis chapter uses polycentric governance as a lens for examining alternative governance visions for urban agriculture, or what I refer to as the urban food commons (UFCs). I draw ideas from the political and institutional economics of Vincent and Elinor Ostrom to discuss why UFCs cannot be governed through a one-size-fits-all institutional arrangement. I interlace my conceptual arguments with empirical examples, including examples from Kaufman and Bailkey’s classic work. Governing UFCs effectively, I argue, requires a mix of institutional arrangements involving centralized, decentralized, competitive market, cooperative, and command-and-control governance models. A polycentric governance vision moves us closer to building such diverse institutional arrangements to manage undesired outcomes, including the capacity to effectively internalize spillover effects from UFCs. I delineate four institutional design parameters (IDPs) to guide the design and evaluation of a polycentric governance vision for UFCs: (1) multiple decision centers (or actors) that can make decisions about UFCs, (2) opportunities for cross-scale and cross-sector interactions among UFC actors, (3) an overarching system of rules to guide decisions and interactions, and (4) adaptability of the rules to align with actors’ incentives and decisions emanating from the rules. I use Chicago’s nonprofit urban land trust NeighborSpace to illustrate how these IDPs manifest empirically.
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Bergmann, Jonas. „Conceptual Approach“. In Studien zur Migrations- und Integrationspolitik, 17–56. Wiesbaden: Springer Fachmedien Wiesbaden, 2023. http://dx.doi.org/10.1007/978-3-658-42298-1_2.

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AbstractIn this chapter, I discuss the main concepts and the theories that guide this research on the impacts of migration from, and immobility in, areas affected by climate hazards. They include the applied approaches to climate impacts, related (im)mobilities, and their well-being effects. After discussing the strengths and limitations of key migration theories, I justify why the Aspirations-Capabilities Framework serves as a valuable foundation for understanding the various ways in which (im)mobilities emerge. Additionally, the Resource-Based Model developed by Ryan and colleagues provides a useful lens to identify key processes and mechanisms through which the impactson migrants and stayers unfold. Such impacts are conceptualized through a well-being prism. Based on a review of prominent well-being concepts, this chapter defines well-being as how the needs that climate migrants or stayers prioritize are met (measures of objective well-being); how they evaluate their life situations cognitively and emotionally in the present; and how they look to the future (measures of subjective well-being). The chapter closes by specifying and justifying the indicators chosen to represent objective and subjective well-being and by comparing them to other existing approaches for measuring the impacts of (im)mobilities.
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„Modes of Religious Spirituality:“. In Spiritual Guides, 95–118. University of Notre Dame Press, 2017. http://dx.doi.org/10.2307/j.ctvpj743b.9.

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RADIGUET, Mathilde. „Cycle sismique de la subduction mexicaine : mise en évidence du rôle clé des déformations transitoires“. In Le cycle sismique, 187–211. ISTE Group, 2023. http://dx.doi.org/10.51926/iste.9038.ch6.

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Ce chapitre présente les caractéristiques du cycle sismique le long de la subduction Mexicaine, et la diversité des modes de glissements sismiques et asismique qui s’y produisent. Les interrelations spatiales et temporelles entre glissements lents, séismes et trémors tectoniques dans cette région y sont détaillées.
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Olyslager, Frank. „Transmission Lines For Quasi-Tem Fields“. In Electromagnetic Waveguides and Transmission Lines, 17–40. Oxford University PressOxford, 1999. http://dx.doi.org/10.1093/oso/9780198564508.003.0002.

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Abstract In this chapter, the transmission line equations are derived immediately from Maxwell’s curl equations. This will not be possible for all types of waveguides and under all circumstances. The discussion has to be restricted to electric wave guides and, furthermore, for these waveguides, to the fundamental propagation. By fundamental propagation is meant propagation that reduces to the classical wire interconnection picture at zero frequency, where one conductor guides the return current and where the other conductors carry the signal currents. In modal language, the fundamental propagation is propagation by the fundamental modes of the waveguide. In an electric waveguide with N + 1 conductors, there are N fundamental modes.
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Méndez, Michael. „Seeing Carbon Reductionism and Climate Change from the Streets“. In Climate Change from the Streets, 1–32. Yale University Press, 2020. http://dx.doi.org/10.12987/yale/9780300232158.003.0001.

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This chapter discusses the modes and logics environmental justice activists employ in climate policymaking. The concepts of carbon reductionism and climate change from the streets are introduced—they provide an overview and framework that guides the analysis presented in the book.
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Konferenzberichte zum Thema "Guides à modes lents"

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Gagnon, L., und C. Paré. „Modal properties of nonlinear parabolic graded-index optical guides“. In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.thy16.

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We study the propagation modes in nonlinear planar and circular media that have a transverse parabolic index profile.1 The first mode profiles, as well as their dispersion curves, are calculated numerically. In particular, one observes a splitting of some linear degenerate modes and cutoff of nonlinear modes because of self-focusing limits. A numerical scheme (beam propagation method) is also used to study near-modal propagation under the paraxial approximation. Those results are compared with an approximate analytical calculation based on the variational principle.2 This approach is not limited to small nonlinearities; it describes quite well the amplitude-dependent quasiperiodic propagation observed numerically. Furthermore, it reproduces the modal dispersion curves in a simple way. These results can also be applied to the study of nonlinear radiation modes of the free three-dimensional paraxial wave equation.
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Bardi, I., O. Biro und K. Preis. „An Efficient Finite-Element Formulation for Anisotrpic Wave-Guides without Spurious Modes“. In 20th European Microwave Conference, 1990. IEEE, 1990. http://dx.doi.org/10.1109/euma.1990.336247.

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Inguva, Ramarao, Jagdish Rai und C. M. Bowden. „Asymmetric modes in nonlinear multilayered waveguides“. In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.fh4.

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We consider the nature of modes in a multilayered guide with a linear core surrounded by nonlinear cladding layers. Neglecting transverse effects we show that a class of asymmetric modes characteristic of nonlinearities of cladding layers can exist in the guide. Absorption1 is included in the analysis. Explicit numerical results with field profiles are presented. It is found that these modes require a threshold flux density for the waves to propagate. The stability1 of these modes with respect to propagation in the guides is investigated. Potential uses are indicated.
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Danawe, H., Z. Wang, S. Tol, G. Okudan und D. Ozevin. „Structurally Embedded Gradient Index Lens for Extended Amplification of Guided Waves in Polymer Pipes“. In ASME 2020 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/smasis2020-2325.

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Abstract In this paper, we propose a novel gradient index metamaterial lens to focus elastic wave energy in polymer pipes. We investigate multi-mode focusing of guided ultrasonic waves in a poly-vinyl chloride (PVC) pipe by designing and integrating an embedded gradient index (GRIN) lens within the pipe wall. The metamaterial lens is composed of equally spaced cylindrical brass inserts embedded into the pipe wall. All the inserts are of same height which is equal to the half-thickness of the pipe. Insert diameters are varied in circumferential direction to realize hyperbolic secant distribution of refractive index around the circumference of pipe. We explore focusing of three pipe wave modes commonly used for guided wave inspection of pipelines namely, L(0,2), L(0,1) and T(0,1), using a single lens design. We further verify the lens performance through numerical simulations estimating the amplification of wave energy in focal regions of the GRIN lens for these three modes. We also estimate attenuation of guided waves propagating in PVC pipe through experimental measurements.
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Danawe, Hrishikesh G., Didem Ozevin und Serife Tol. „Numerical Investigation of Multi-Mode Guided Wave Focusing in Pipe–Like Structures Using Gradient Index Metamaterial Lens Design“. In ASME 2020 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/detc2020-22522.

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Abstract This paper presents a numerical study on multi-mode focusing of guided elastic waves in pipe-like structures over a range of frequencies using a single metamaterial lens design. We explore focusing of the first two longitudinal (L(0,1) and L(0,2)) and the first torsional (T(0,1)) wave modes in steel pipe integrated with a metamaterial lens made of cylindrical steel stubs of varying heights attached to outer surface of the pipe. Proposed metamaterial lens design is based on gradient index (GRIN) theory with hyperbolic secant distribution of refractive index in circumferential direction. Amplification of multi-mode guided wave signals are achieved at focal points of the lens which is verified through numerical simulations. The focusing performance of proposed lens is studied at multiple frequencies for all the three modes and first two focal positions are verified with theoretical predictions of GRIN theory.
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Spielman, Barry. „Effects of Wall Perturbations on TM Modes in Arbitrarily-Shaped Cylindrical Wave Guides“. In 2006 IEEE MTT-S International Microwave Symposium Digest. IEEE, 2006. http://dx.doi.org/10.1109/mwsym.2006.249914.

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Ma, Zelin, Muhammad Waleed Khalid und Siddharth Ramachandran. „Long-distance Pulse Propagation of 50 Uncoupled Fiber Modes due to Topological Confinement“. In CLEO: Science and Innovations. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_si.2022.stu4p.3.

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We demonstrate unmixed pulse propagation of 50 modes over ~0.5km of a fiber with average mode purity ~18dB and loss ~4dB/km exploiting a phenomenon where light guides due to topological confinement rather than total internal reflection.
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Rastani, K., und A. R. Tanguay. „Grating Outcoupling From Large Area Rib Waveguide Arrays Fabricated on Titanium Indiffused Lithium Niobate Substrates“. In Integrated and Guided Wave Optics. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/igwo.1988.tud6.

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The Integrated Optical Synthetic Aperture Radar (IOSAR) Processor [1] is one of a number of potentially powerful optical signal processing components that combine many of the throughput characteristics of bulk optical processors with the cost, size, and power advantages of guided wave optical devices. One of several novel features of the IOSAR processor is the capability of performing an inherently two dimensional image formation function in an integrated optical configuration by a combination of spatial and temporal integration. This can be accomplished as shown schematically in Fig. 1. The radar return (a linear FM chirp) is input to the processor by means of a surface acoustic wave transducer. Coherent light from a pulsed laser diode is collimated by lens L1 and focused on an array of rib waveguides by lens L2 (a spatial integration). The large area waveguide array performs an image dissection in the range dimension. Light propagating in a given rib waveguide (a given range bin) is then selectively outcoupled through a mask encoded with the azimuth doppler history onto a two dimensional CCD detector operated in the shift-and-add mode. Sequential radar returns are then integrated with appropriate shifts (a temporal integration) to perform the required azimuth compression.
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Black, R. J., F. Gonthier, A. Hénault und S. Lacroix. „Comparison between the beam-propagation method and coupled-mode simulations for nonuniform guides with circular symmetry“. In Integrated Photonics Research. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/ipr.1990.mg4.

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The field in optical fibers, whether they are longitudinally uniform or not, may be expanded over a complete set of modes. Whereas for uniform fibers the field evolution simply depends on beating given by modal phase differences, in the nonuniform case it can be described by a coupled-mode formalism.1 The choice of the set over which the expansion is made and the number of modes to be considered in a numerical simulation are both important. Two cases are examined: an abruptly tapered fiber2 and a nonlinear index fiber.3 In the case of an abruptly tapered fiber the nonuniformity comes from the fiber radius variation, and the set of normal modes is naturally chosen to be the local modes.1 In the nonlinear case the field is expanded over the linear modes, i.e., the modes of the guide when the Kerr nonlinearity coefficient n2 is zero or the injected power is low. For typically tapered fibers,2 a reasonably uniform convergence of the results is usually observed when the number of the guided modes involved is increased to between 3 and 6, the required number depending on the magnitude of the nonuniformity. However, the validity of such a convergence in terms of only low-order modes may be questioned. To verify these results, we developed a modified beam-propagating method (BPM) program to simulate the field evolution in cylindrically symmetric guides.4 Figure 1 gives a sample simulation for a finite-cladding tapered fiber. Figure 2 shows in this case the comparison of the power in each mode given in (i) the coupled-mode simulation (with sufficient modes for convergence) by the expansion coefficients and (ii) the BPM simulation by the overlap of the total field with the modal fields. The good agreement suggests that radiation is negligible and that only a small number of guided modes is adequate for a coupled-mode formulation to describe the field well. The nonlinear case comparison is also examined to check the convergence criterion validity.
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Schro¨cker, Hans-Peter, Manfred L. Husty und J. Michael McCarthy. „Kinematic Mapping Based Evaluation of Assembly Modes for Planar Four-Bar Synthesis“. In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-85037.

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This paper presents a new method to determine if two task positions used to design a four-bar linkage lie on separate circuits of a coupler curve, known as a “branch defect.” The approach uses the image space of a kinematic mapping to provide a geometric environment for both the synthesis and analysis of four-bar linkages. In contrast to current methods of solution rectification, this approach guides the modification of the specified task positions, which means it can be used for the complete five position synthesis problem.
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Berichte der Organisationen zum Thema "Guides à modes lents"

1

Harris, Aubrey, Nathan Richards und S. McKay. Defining levels of effort for ecological models. Engineer Research and Development Center (U.S.), September 2023. http://dx.doi.org/10.21079/11681/47642.

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While models are useful tools for decision-making in environmental management, the question arises about the level of effort required to develop an effective model for a given application. In some cases, it is unclear whether more analysis would lead to choosing a better course of action. This technical note (TN) examines the role of ecological model complexity in ecosystem management. First, model complexity is examined through the lens of risk informed planning. Second, a framework is presented for categorizing five different levels of effort that range from conceptual models to detailed predictive tools. This framework is proposed to enhance communication and provide consistency in ecological modeling applications. Third, the level of effort framework is applied to a set of models in the Middle Rio Grande River system to demonstrate the framework’s utility and application. Ultimately, this TN seeks to guide planners in determining an appropriate level of effort relative to risks associated with uncertainty and resource availability for a given application.
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