Academic literature on the topic 'Temporal cavities'
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Journal articles on the topic "Temporal cavities"
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Fry, Edward S., Joe Musser, George W. Kattawar, and Peng-Wang Zhai. "Integrating cavities: temporal response." Applied Optics 45, no. 36 (December 20, 2006): 9053. http://dx.doi.org/10.1364/ao.45.009053.
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Youngs, Robin. "Temporal bone histopathology of open mastoidectomy cavities." Journal of Laryngology & Otology 107, no. 6 (June 1993): 569–73. http://dx.doi.org/10.1017/s0022215100123734.
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Open cavity mastoidectomy remains the principle surgical treatment of middle ear cholesteatoma in the United Kingdom. A significant proportion of mastoid cavities are prone to intermittent or continuous discharge.In this study the temporal bone histopathology of four patients who had undergone open cavity mastoidectomy is presented. Cavities were predominantly lined with stratified keratinizing squamous epithelium. Residual air cells were obliterated by fibrous tissue, with no evidence of persistent respiratory epithelium. Where inflammatory changes were found, these consisted of areas of granulation tissue in association with epithelial ulceration. Residual cholesteatoma pearls (epidermoids) were not associated with significant inflammatory changes.
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Tucker, Paul G. "TEMPORAL BEHAVIOR OF FLOW IN ROTATING CAVITIES." Numerical Heat Transfer, Part A: Applications 41, no. 6-7 (May 2002): 611–27. http://dx.doi.org/10.1080/104077802317418241.
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Lilienfein, N., C. Hofer, M. Högner, T. Saule, M. Trubetskov, V. Pervak, E. Fill, et al. "Temporal solitons in free-space femtosecond enhancement cavities." Nature Photonics 13, no. 3 (January 21, 2019): 214–18. http://dx.doi.org/10.1038/s41566-018-0341-y.
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Rosanov, Nikolay N., George B. Sochilin, Vera D. Vinokurova, and Nina V. Vysotina. "Spatial and temporal structures in cavities with oscillating boundaries." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 372, no. 2027 (October 28, 2014): 20140012. http://dx.doi.org/10.1098/rsta.2014.0012.
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We review the general features of particles, waves and solitons in dynamical cavities formed by oscillating cavity mirrors. Considered are the dynamics of classical particles in one-dimensional geometry of a dynamical billiard, taking into account the non-elastic collisions of particles with mirrors, the (quasi-energy) states of a single quantum particle in a potential well with periodically oscillating wells, and nonlinear structures, including nonlinear Rabi oscillations, cavity optical solitons and solitons of Bose–Einstein condensates, in dynamical cavities or traps.
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Xue, Xiaoxiao, Xiaoping Zheng, and Bingkun Zhou. "Super-efficient temporal solitons in mutually coupled optical cavities." Nature Photonics 13, no. 9 (May 13, 2019): 616–22. http://dx.doi.org/10.1038/s41566-019-0436-0.
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Perrone, M. R., C. Panzera, and D. Diso. "Coherence temporal evolution in Gaussian cavities of different lengths." Journal of the Optical Society of America A 15, no. 8 (August 1, 1998): 2138. http://dx.doi.org/10.1364/josaa.15.002138.
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Rădulescu, Marian, Adela-Ioana Mocanu, Alexandra-Cristina Neagu, Mihai-Adrian Schipor, and Horia Mocanu. "Defining the URCOTEBS System as a Unilateral Radiographic–Stochastic Model for the Complementary States (Health/Disease) of the D-Organ and Middle-Ear Mucosa." Applied Sciences 13, no. 23 (November 30, 2023): 12861. http://dx.doi.org/10.3390/app132312861.
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The middle ear (ME) is a notoriously complicated anatomic structure, geometrically arranged as irregular interlinked spheroidal and polyhedric cavities dug inside the temporal bone (TB). The bony walls of these cavities are radiopaque and form the bony support for the D-Organ that we have previously defined as corresponding to the epithelium covering the Antrum walls (belonging to the central cavities of the middle ear) and the walls of mastoid and petrous cavities (the peripheral cavities of the ME). The aim of the study is to define an exact method for categorizing a Unilateral Radiographic COnformation of the TEmporal Bone in Schuller’s projection (URCOTEBS) under one of the four defined conformations and using it for practical everyday clinical purposes. The conclusion is that a radiograph in Schuller’s projection is a concrete way of storing precise information on the status (health/disease) of the D-Organ and therefore of the ME mucosa. These data is encoded within the image and we aim to decode and translate them into clinical data. The URCOTEBS results in an overlapping projection of all bony cavities that comprise the General Endo-temporal Bony Cavity Complex onto the same plain (film). This characteristic of classical film imaging constitutes an advantage from the multiple CT sections, as far as our proposed approach goes, because the set of stochastic information is found in the whole of the cavities taken as one on the same image, to which the measurement gauges can be easily applied. The decoding must be performed accordingly, and this occurs much faster with conventional radiography. This image of the TB in Schuller’s projection is a mirror that reflects the status of the ME mucosa, and URCOTEBS encodes the physiological state of the D-Organ. The present work gives, through stochastic methods, the key to decoding this information into clinical language. In ascending order of their projection areas (projection of their Variable Geometry Peripheral Endo-temporal Bony Cavity Complex) we can recognize URCOTEBS_d, URCOTEBS_c, URCOTEBS_b, and URCOTEBS_a. The corresponding Greek letter designates the state of disease for each of these conformations: URCOTEBS_δ, URCOTEBS_γ, URCOTEBS_β, URCOTEBS_α, and the capital letters define their state of health: URCOTEBS_D, URCOTEBS_C, URCOTEBS_B, URCOTEBS_A. URCOTEBS_d is the smallest unilateral radiographic conformation of the TB in Schuller’s projection and is, by definition, a radiographic image of the state of disease of the D-Organ. The probability of disease in URCOTEBS_d is 100%. This radiographic system is readily available and clinically usable.
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Han, Xue, Ying Hu, Xiaocong Zhu, and Lixi Huang. "Broadband noise absorption by time-varying devices." Journal of the Acoustical Society of America 154, no. 4_supplement (October 1, 2023): A187. http://dx.doi.org/10.1121/10.0023216.
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A resonator array can broaden the effective sound absorption bandwidth by using the structure with multiple cavities in parallel or in series in space. However, this kind of fixed mechanical structure cannot flexibly adapt to different noise sources, which severely limits the development prospect of the resonator array in practical applications. In this paper, a time-varying resonator is proposed based on a shunted electrical circuit, realizing the equivalent effect of multi-cavities in space. Based on the working principle of spatial and temporal resonators, the theoretical models are established, and the three designs for achieving broadband effects are analyzed theoretically. Through time-domain numerical calculation, the sound absorption performance of the two spatial designs and the temporal design with the same cavity volume is obtained. This study focuses on the scheme design and performance optimization of the temporal resonator. Compared with the traditional spatial resonator, the proposed temporal resonator has the advantages of tunable frequency and high adaptability to varying sources while achieving similar or even better sound absorption performance.
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Matthieu, Ruppin, Catheline Stefan, and Roux Philippe. "One channel spatio-temporal inversion of acoustic wave in reverberant cavities." Journal of the Acoustical Society of America 130, no. 4 (October 2011): 2515. http://dx.doi.org/10.1121/1.3655026.
Full textDissertations / Theses on the topic "Temporal cavities"
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Klaedtke, Andreas. "Spatio-temporal non-linear dynamics of lasing in micro-cavities full vectorial Maxwell-Bloch FDTD simulations /." [S.l. : s.n.], 2004. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB12103645.
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Phung, Viet Tiep. "Cavity ring-down spectroscopy of astrophysically relevant molecular species, toward quantitative and high resolution studies using spectro-temporal properties of high finesse cavities." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS188/document.
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Le principal objectif de ce travail de thèse a été de développer de nouvelles techniques de spectroscopie moléculaire afin obtenir de nouvelles données spectroscopiques dans le visible et le proche infrarouge pour des molécules, radicaux ou ions d’intérêt astrophysiques. La première partie de ce travail a consisté en l’étude d’harmoniques élevés, très faibles en intensité, de bandes vibrationnelles de la molécule HC₃N (cyanoacetylène), par la technique de spectroscopie CRDS. La deuxième partie a consisté en l’étude spectroscopique d’espèces instables radicalaires. Pour cela, une décharge inductive Radio Fréquence a été couplée au montage CRDS. Le plasma ainsi créé a été caractérisé et sa capacité à produire des anions a été démontrée via notamment la mesure quantitative du rapport C₂ / C₂⁻pour une grande variété de conditions expérimentales. De même, une analyse spectroscopique quantitative a été menée sur les radicaux isotopomères ¹⁴NH₂ et ¹⁵NH₂. Cette étude valide certaines hypothèses faites dans de précédents travaux ayant permis de mesurer le rapport isotopique ¹⁵N/¹⁴N dans les comètes, pour la première fois à partir de raies d’émission de ces 2 isotopomères portant un groupe amino. La troisième et dernière partie de ce travail a consisté en le développement d’une nouvelle technique expérimentale appelée Broad-Band Dual Etalon Frequency COMb. Cette technique expérimentale basée sur l’utilisation de 2 cavités optiques de haute finesse devrait permettre d’obtenir une spectroscopie avec une résolution spectrale ultime non limitée par la source laser nanoseconde large bande mais par l’intervalle spectral libre des cavités de haute finesse utiliséesThe main objective of this PhD was to develop spectroscopic techniques using high finesse optical cavities. These were applied to the measurement of quantitative spectroscopic data for neutral, radical and ionic molecular species of astrophysical interest in the near infrared and visible spectral range. The first part was devoted to the measurement of the oscillator strength of high vibrational overtone bands of the cyanoacetylene (HC₃N) molecule with the Cavity Ring Down Spectroscopy (CRDS) technique. The second part was devoted to the study of the spectroscopy of transient neutral and ionic species. For that, an inductively radio frequency (RF) discharged has been coupled to the CRDS set up. The pertinence of this plasma to efficiently produce anions was demonstrated via the quantitative measurement of the C₂ / C₂⁻ ratio in a wide variety of conditions. A quantitative spectral analysis of the radical isotopomers ¹⁴NH₂ and ¹⁵NH₂ was also performed for the first time. This study provides experimental data that will allow to better constraint the ¹⁵N/¹⁴N isotopic ratio in comets through the emission lines of these two amino bearing isotopomers. The third and last part of the work was devoted to the development of a CRDS scheme called Broad Band Dual Etalon Frequency Comb Ring Down Spectroscopy. This new heterodyne technique, based on the use of the microsecond frequency combs generated by two high finesse optical cavities, should allow performing molecular spectroscopy with ultrahigh spectral resolution. First proof experiments were performed and perspective’s for improvement of the method is provided
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JOURDAIN, HUTH JOELLE. "Interet du lambeau de muscle temporal dans les cavites d'ethmoidectomie et maxillectomie : etude anatomique et clinique." Limoges, 1989. http://www.theses.fr/1989LIMO0131.
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Catheline, Stefan. "ETUDES EXPERIMENTALES EN ACOUSTIQUE : DE L'ELASTOGRAPHIE AUX CAVITES REVERBERANTES." Habilitation à diriger des recherches, Université Paris-Diderot - Paris VII, 2006. http://tel.archives-ouvertes.fr/tel-00378138.
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Le premier chapitre de ce mémoire porte sur l'élastographie transitoire, une nouvelle technique ultrasonore capable de cartographier l'élasticité de cisaillement du corps humain. Cette information est utilisée depuis longtemps par les médecins lorsqu'ils procèdent à un examen par palpation. Un outil de palpation ultrasonore pourrait être extrêmement efficace pour dépister ou diagnostiquer certains cancers comme celui du sein par exemple. C'est le sujet de la première partie. La thèse de Laurent Sandrin (novembre 2000) a montré la faisabilité de cette technique d'imagerie pour localiser et mesurer l'élasticité d'inclusions « dures » dans des gels d'agar-gélatine. Les premiers essais cliniques ont lieu à l'Institut Curie en juin 2001. La fin de cette première partie est consacrée à l'utilisation de la force de radiation acoustique en élastographie transitoire.Dans la deuxième partie, nous nous attachons à décrire la viscosité des tissus biologiques. Cette problématique a été étudiée pendant la thèse de Jean-Luc Gennisson (soutenue en septembre 2003) d'un point de vue académique et pendant la thèse de Jeremy Bercoff (décembre 2004) pour une application en imagerie médicale. Enfin, une coopération avec Ralph Sinkus (Philipps Research Hamburg) dans le domaine de l'élastographie par IRM a permis de jeter les bases d'un algorithme de problème inverse visco-élastique.
Notre quête des paramètres mécaniques des tissus biologiques nous a naturellement amenés vers le sujet de la troisième partie : l'anisotropie. Avec Jean-Luc Gennisson alors en thèse, nous avons mené à l'institut de Myologie de l' hôpital La Pitié Salpêtrière ainsi qu'avec Christophe Cornu et Pierre Portero, une campagne expérimentale portant sur les mesures d'élasticité transverse du biceps sur dix volontaires. Ces travaux scientifiques dans les milieux biologiques où l'anisotropie est une règle plutôt qu'une exception, nous ont permis d'établir des collaborations fructueuses avec Steve Levinson, université de Rochester, NY, pionnier de l'élastographie stationnaire. L'excellent accord entre les expériences et la théorie de l'élasticité dans les milieux anisotropes nous a poussés à formuler avec Ralph Sinkus (Philipps Research Hamburg) les bases d'un algorithme de problème inverse visco-anisotrope.
Si l'étude de la non linéarité dans les métaux, les cristaux et les roches a donné lieu à de nombreuses publications, la littérature est extrêmement avare en matière de non linéarité dans les solides mous. De ce fait, cette troisième partie qui décrit des recherches à caractère fondamental, constitue la partie la plus académique du mémoire. Grâce à l'élastographie transitoire, nous avons pu obtenir des résultats quantitatifs sur la mesure des coefficients non linéaires de Landau. Les résultats d'expériences d'acoustoélasticité, celles d'ondes transverses de fortes amplitudes ou d'interactions non linéaires d'ondes transverses menées avec Jean-Luc Gennisson, Jeremy Bercoff (thèse soutenue en décembre 2004) et Xavier Jacob (soutenance de thèse prévue en mai 2005) convergent vers la conclusion suivante : si le coefficient élastique de compression du second ordre λ est de six ordres de grandeur supérieur au coefficient élastique de cisaillement μ dans les solides mous, il en va de même pour les coefficients élastiques non linéaires de compression du troisième ordre B et C par rapport au coefficient élastique non linéaire de cisaillement A. Ces résultats expérimentaux nous ont permis de collaborer avec les théoriciens de grande renommée, Yuri Ilinsky et Zhenia Zabolotskaya de l'université de Huston, TX, que nous avons eu le plaisir d'accueillir trois semaines au laboratoire en juillet 2004.
Comme j'ai passé toutes les années de thèse dans un laboratoire dont le thème de recherche principal est le retournement temporel des ondes acoustiques, il était fatal que, tôt ou tard, cette thématique très riche et très féconde me contamine. Mes premières expériences de retournement temporel acoustique ont été effectuées sur un coin de table au Marine Physical Laboratory, à l'institut Scripps de San Diego, CA, pendant mon année post doctorale dont le thème était : « mesures ultrasonores de diamètres de vaisseaux sanguins ». A mon retour au laboratoire Ondes et Acoustique en janvier 2000, Ros Kiri Ing, Mathias Fink et moi avons lancé cette thématique sur le retournement temporel des cavités réverbérantes immergées, qui s'est avérée partager avec les expériences de retournement temporel dans les milieux multidiffuseurs ou dans les guides d'ondes bon nombre de problématiques.
Ces recherches, dont l'essentiel est synthétisé dans le second chapitre, ont été menées parallèlement aux activités d'élastographie et, bien entendu, parallèlement à mes activités d'enseignement à l'université de Paris 7. Outre l'intérêt scientifique de vérifier les lois de la diffraction ou le principe d'Huygens dans des cavités chaotiques en contact avec un transducteur ultrasonore unique, nous avons montré pendant la thèse de Nicolas Quieffin (soutenue en décembre 2004) comment le champ acoustique réverbéré pouvait être contrôlé afin de focaliser les ultrasons en temps réel à l'extérieur de la cavité immergée. Les applications potentielles de ce procédé dans le domaine de l'imagerie notamment médicale pourraient permettre d'envisager des systèmes utilisant un petit nombre de transducteurs donc à faible coût. Mais c'est dans un tout autre domaine, celui de l'interactivité, que ce procédé est apparu immédiatement utile. Ros Kiri Ing et moi avec le projet ReverSys « les interfaces acoustiques interactives » soutenu par AGORANOV, incubateur d'entreprises de
technologies innovantes, avons obtenu la mention spéciale du jury au Grand Prix de l'Innovation de la Ville de Paris 2003. Sous l'impulsion de Ros Kiri Ing, la société Sensitive Object a vu le jour en octobre 2003.
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PINI, MICHEL. "Interet du lambeau temporo-frontal dans la reparation des cavites d'exenteration orbitaire." Aix-Marseille 2, 1990. http://www.theses.fr/1990AIX20090.
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Portal, Nicolas. "Segmentation et suivi temporel automatiques des cavités cardiaques en IRM dynamique." Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS306.
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Le but de la thèse est de développer un algorithme d'apprentissage profond capable de segmenter toutes les cavités cardiaques sur des séquences d'images IRM petit axe. L'algorithme sera utilisé pour initialiser et contraindre spatialement le logiciel « cardio-track », capable d'effectuer une segmentation semi-automatique sur l'ensemble du cycle cardiaque. Cet algorithme permettra d'extraire des biomarqueurs à même de faciliter le diagnostique de pathologies cardiaques. Dans un second temps, un algorithme permettant de suivre des points de contour sur des séquences IRM (IRM dynamique) sera développé. Cet algorithme permettra d'estimer le déplacement des points de contours en tenant compte de l'aspect temporel afin de calculer la déformation des structures cardiaques . En particulier, la déformation régionale du myocarde pourra être estimé afin de prédire la survenu des infarctus du myocarde. Les déformations prédites seront comparées aux déformations obtenus avec le logiciel CardioTrackThe aim of the thesis is to develop a deep learning algorithm ableof segmenting all cardiac cavities in short-axis MRI image sequences. The algorithm will be used to initialize and spatially constrain the "cardio-track" software, which can perform semi-automatic segmentation throughout the cardiac cycle. This algorithm will allow for the extraction of biomarkers that can facilitate the diagnosis of cardiac pathologies. Then, in a second phase, an algorithm for tracking contour points in MRI sequences (dynamic MRI) will be developed. This algorithm will estimate the displacement of contour points using temporal information in order to compute the deformation of cardiac structures. In particular, myocardial regional strain can be estimated to predict the occurrence of myocardial infarctions. The estimated cardiac strain will then be compared with the ground truth strain computed by the CardioTrack software
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Dioum, Bakhao. "Manipulation and Characterization of Multimode Quantum Light in Photonic Systems." Electronic Thesis or Diss., Université de Lille (2022-....), 2024. http://www.theses.fr/2024ULILR072.
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Cette thèse fait progresser l'optique quantique multimode à travers deux contributions théoriques et pratiques majeures.Premièrement, nous introduisons les cavités temporelles comme une nouvelle approche pour le filtrage des modes temporels, en exploitant les principes de dualité espace-temps pour transposer les principes des cavités de nettoyage de modes spatiaux au domaine temporel. Contrairement aux approches existantes, cette opération de filtrage ne repose pas sur des interactions non linéaires ou sur l'accord de phase, préserve la fréquence porteuse et maintient intacte la structure des modes temporels. Nous démontrons la faisabilité d'une implémentation pratique utilisant des lentilles temporelles électro-optiques et des réseaux de diffraction, avec des stratégies complètes d'optimisation des paramètres pour les applications classiques et quantiques.Deuxièmement, nous abordons les limitations fondamentales de la détection d'états quantiques à travers les interféromètres à effet mémoire (IME). Nous établissons de nouveaux critères pour prédire la compression cachée directement à partir des paramètres du système et développons de nouvelles méthodes de décomposition lisse pour implémenter des unitaires dépendant de la fréquence. Ces innovations permettent un appariement parfait des modes pour les états présentant des caractéristiques spectrales complexes et des supermodes morphants, qui sont plus courants que précédemment reconnu dans les systèmes quantiques basés sur des cavités. L'efficacité de notre approche est démontrée par des études de cas détaillées de configurations d'oscillateurs paramétriques optiquesThis thesis advances multimode quantum optics through two major theoretical and practical contributions.First, we introduce temporal cavities as a novel approach to temporal mode filtering, leveraging space-time duality principles to translate spatial mode-cleaning cavity principles to the temporal domain. Unlike existing approaches, this filter operation does not rely on nonlinear interactions or phase matching, preserves the carrier frequency, and maintains the temporal mode structure intact. We demonstrate practical implementation feasibility using electro-optic time lenses and diffraction gratings, with comprehensive parameter optimization strategies for both classical and quantum applications.Second, we address fundamental limitations in quantum state detection through interferometers with memory effect (IME). We establish new criteria for predicting hidden squeezing directly from system parameters and develop novel smooth decomposition methods for implementing frequency-dependent unitaries.These innovations enable perfect mode-matching for states exhibiting complex spectral features and morphing supermodes, which are more common than previously recognized in cavity-based quantum systems. The effectiveness of our approach is demonstrated through detailed case studies of optical parametric oscillator configurations
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SOULHIARD, FRANCOIS. "Interet du lambeau de muscle temporal dans la reconstruction de la cavite buccale : etude anatomique et clinique." Lyon 1, 1990. http://www.theses.fr/1990LYO1M088.
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Soltane, Ayoub. "Contributions expérimentales originales en chambres réverbérantes à brassage de modes et en cavités surdimensionnées." Thesis, Limoges, 2018. http://www.theses.fr/2018LIMO0092/document.
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La chambre réverbérante à brassage de modes (CRBM) est une cavité métallique fermée surdimensionnée, équipée d’un brasseur de modes. Le brassage de modes rend le champ électromagnétique homogène et isotrope à l’intérieur de la CRBM (dans son volume utile). Cette thèse illustre tout d’abord une nouvelle méthode pour évaluer les performances d’un brasseur de modes (via le spectre Doppler). Ensuite, elle présente une nouvelle méthode permettant de mesurer la surface équivalente radar (SER) d’un objet canonique en utilisant la technique de fenêtrage temporel ou time-gating. Enfin, elle présente une nouvelle méthode permettant de mesurer le diagramme de rayonnement d’une antenne dans une cavité surdimensionnée via la technique de time-gatingThe reverberation chamber (RC) is an oversized closed metal cavity, equipped with a mode-stirrer. The mode stirring makes the electromagnetic field homogeneous and isotropic inside the RC (in its useful volume). This thesis illustrates firstly a new method for evaluating the performance of a mode-stirrer (via the Doppler spectrum). Then, it presents a new method for measuring the radar cross section (RCS) of a canonical object using the time-gating technique. Finally, it presents a new method for measuring the antenna radiation pattern in an oversized cavity via the time-gating technique
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Li, Yifeng. "Développement d’outils de simulation numérique pour l’élastodynamique non linéaire : application à l’imagerie acoustique de défauts à l’aide de transducteur à cavité chaotique." Thesis, Ecole centrale de Lille, 2009. http://www.theses.fr/2009ECLI0014/document.
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Dans cette thèse nous proposons de développer un système d’imagerie ultrasonore innovante de micro- défauts basé sur l’utilisation conjointe de techniques d’acoustique non linéaire et du concept de "transducteur à cavité chaotique". Ce transducteur correspond à la combinaison d’une céramique piézoélectrique collée sur une cavité de forme chaotique et du principe de retournement temporel. La faisabilité et les performances de ce nouveau système sont explorées par des simulations numériques. Des paramètres optimaux d’utilisation pour une implémentation expérimentale sont proposés. Une grande partie des travaux menés dans le cadre de cette thèse se concentre sur le développement d’outils numériques permettant l’amélioration de telles techniques d’imagerie. Un schéma d’éléments finis de type Galerkin Discontinu (GD) est étendu à l’élastodynamique non linéaire. Un type de zone absorbante parfaitement adaptée, appelée "Nearly Perfectly Matched Layer" (NPML) a aussi été développé. Dans le cas de matériaux orthotropes, comme des problèmes de stabilité apparaissent, un mélange de NPML et de zone atténuante, dont on contrôle la proportion respective, est introduit afin de stabiliser les NPML. Une validation expérimentale du concept de "transducteur à cavité chaotique" pour la focalisation dans un milieu solide, réverbérant ou non, en utilisant une seule source est réalisée. Les méthodes de retournement temporel et de filtre inverse sont présentées et comparées. La démonstration expérimentale qu’un "transducteur à cavité chaotique" peut être utilisé conjointement avec les méthodes d’inversion d’impulsion afin de réaliser une image de non linéarités localisées est présentéeIn this thesis we propose the development of an innovative micro-damage imaging system based on a combination of Nonlinear Elastic Wave Spectroscopy techniques and “chaotic cavity transducer” concept. It consists of a combination of a PZT ceramic glued to a cavity of chaotic shape with the time reversal principle. The feasibility and capabilities of these new ideas is explored by numerical simulations, and optimal operational parameters for experimental implementation are suggested based on the modelling support. A large part of the research work conducted in this thesis is concentrated on the development of numerical simulation tools to help the improvement of such nonlinear imaging methods. A nodal Discontinuous Galerkin Finite Element Method (DG-FEM) scheme is extended to nonlinear elasto-dynamic including source terms. A Perfectly Matched Layer absorbing boundary condition well adapted to the DG-FEM scheme, called Nearly Perfectly Matched Layer (NPML), is also developed. In the case of orthotropic material as stability problems appear, a mixture of NPML and sponge layer, with a controllable ratio of these two kinds of absorbing layers, is introduced. The experimental validation of “chaotic cavity transducer” to focalize in reverberant and non-reverberant solid media with only one source is made. Classical time reversal, inverse filter and 1 Bit time reversal process are discussed and compared. The experimental demonstration of the use of a “chaotic cavity transducer”, in combination with the pulse inversion and 1-bit methods, to obtain an image of localized nonlinearity is made. This opens the possibility for high resolution imaging of nonlinear defects
Book chapters on the topic "Temporal cavities"
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Kongmebhol, Pailin, and Jose Florencio Lapeña. "Imaging of Ear, Nose, and Throat Tuberculosis: Temporal Bone, Sinonasal Cavities, Pharynx, and Larynx." In Imaging of Tuberculosis, 157–83. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-07040-2_7.
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O’Donnell, Colin F. J., and Jane A. Sedgeley. "Causes and Consequences of Tree-Cavity Roosting in a Temperate Bat, Chalinolobus tuberculatus, from New Zealand." In Functionaland Evolutionary Ecology of Bats, 308–28. Oxford University PressNew York, NY, 2006. http://dx.doi.org/10.1093/oso/9780195154726.003.0017.
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Abstract Among the 79 taxa of Microchiroptera in Australasia, frequency of treecavity roosting increases as mean annual temperature decreases and latitude increases. This gradient suggests there may be significant thermal benefits to tree-cavity roosting in cold climates. We explore the causes and consequences of tree-cavity roosting during summer months in Chalinolobus tuberculatus, a species that occurs at the southern limit (highest latitude) of this gradient. Five geographically distinct populations are compared. C. tuberculatus selected the oldest and largest trees for maternity roosting and avoided roosting under bark and in caves and buildings, despite the abundance of these sites. It also selected small, well-insulated cavities that accrue significant energy conservation benefits compared with other potential roosts (the ‘‘thermal hypothesis’’). Reproductive females selected roosts that reach maximum temperatures late in the day and retain high temperatures through the night, thus benefiting nonvolant young. Productivity and survival were significantly higher in populations that selected well-insulated roosts. We propose that selection favors smaller, rather than larger, roosting group sizes in this cold, temperate climate. Smaller groups of bats that use relatively small, well-insulated cavities have higher survival rates than larger groups that use larger, less insulated cavities. C. tuberculatus formed behaviorally, though not geographically, isolated subgroups. All colonies exhibited extreme roost-site lability on a daily basis, but strong long-term philopatry among pools exceeding 100 roosts. Most roosts were used once per year but date of reuse was similar each year. Strict temporal philopatry suggests that bats do not switch roosts in response to daily variability in weather conditions. The thermal hypothesis suggests that development of grouping behavior may be an incidental response to physiological constraints on thermoregulation and reproduction. Nevertheless, social interdependence would increase the probability that clusters are large enough on any one day to be thermally beneficial and individuals could improve the reproductive success of other relatives within the group. We conclude by outlining hypotheses that could test the general applicability of findings to tree-cavity roosting bats.
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Ribas, Guilherme, Eduardo Ribas, and Ramez W. Kirollos. "Surgical management of intraventricular lesions." In Oxford Textbook of Neurological Surgery, edited by Ramez W. Kirollos, Adel Helmy, Simon Thomson, and Peter J. A. Hutchinson, 411–24. Oxford University Press, 2019. http://dx.doi.org/10.1093/med/9780198746706.003.0035.
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Deep understanding of neuroanatomy is mandatory in planning and execution of surgery for intraventricular lesions. These operative procedures include both open and endoscopic approaches, and choosing the appropriate trajectory to the various parts of the ventricles can minimize the resulting morbidity of the approach, which may occur in addition to the potential risk to the surrounding structures during resection of the lesion itself. The use of the natural spaces provided by the cerebral fissures and sulci allows access to the ventricular cavities whenever possible, however, traversing neural tissue eventually is inevitable. The juxta-midline location of the frontal horns and body of the lateral ventricle and the third ventricle allows the use of interhemispheric approaches. On the other hand, transcortical/trans-sulcal approaches are necessary for lesions located within the atrium or temporal horns of the lateral ventricle. In planning these approaches not only exquisite knowledge of the functional anatomy of the cortex is required, but also understanding the subcortical architecture of the white matter fibres to choose the safest rather than just the shortest route. Furthermore, appreciating the potential morbidity from injuring the surrounding intra- and peri-ventricular structures and awareness of the blind spots related to the various trajectories cannot be underestimated. Surgery for fourth ventricular lesions is covered elsewhere.
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Atkinson, Martin E. "The structure of the central nervous system." In Anatomy for Dental Students. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199234462.003.0023.
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It is important to have a picture of the relationship of the brain and spinal cord to the bones of the skull and vertebral column that house and protect them and the protective layers of connective tissues known as the meninges that cover the CNS; these lie between the bones and brain and spinal cord. The brain is housed within the skull which will be described in much more detail in Section 4 . As you can appreciate by feeling your own skull, the top, front, sides, and back are smoothly curved. The surface of the brain is similarly curved and conforms to the shape of the bones. Note that, in reality, it is really the other way round—brain shape determines the shape of the bones of the skull vault forming the braincase. If the top of the braincase and the brain are removed to reveal the floor of the cranial cavity formed by the bones of the cranial base, it is anything but smooth. Viewed from the lateral aspect and going from anterior to posterior, it is like three descending steps. This structure is shown diagrammatically in Figure 15.1 and shows how different parts of the brain conform to these steps. The first step lies above the nasal and orbital cavities and is known as the anterior cranial fossa ; it houses the frontal lobes of the cerebral hemispheres. The second step is the middle cranial fossa and contains the temporal lobes of each cerebral hemisphere laterally and the midbrain and pons medially. The final step is the posterior cranial fossa where the rest of the brainstem and cerebellum lie. The floor of the posterior fossa is pierced by the foramen magnum through which the medulla oblongata and spinal cord become continuous. The spinal cord occupies the vertebral canal running in the vertebral column. As you can see in Figure 3.5 , in adults, the cord occupies the vertebral canal from the upper border of the first cervical vertebra, the atlas, down to the level of the disc between the first and second lumbar vertebrae.
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Chauhan, Arushi, and Pramod K. Avti. "Computational Approaches in Evaluating the 5-HT Subtype Receptor Mechanism of Action for Developing Novel Chemical Entities." In Frontiers in Computational Chemistry volume 7, 156–96. BENTHAM SCIENCE PUBLISHERS, 2024. http://dx.doi.org/10.2174/9789815179033124070006.
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The G-protein coupled receptor GPCR family is the most numerous and diversified set of membrane receptors linked with various neurological disorders like Epilepsy, Alzheimer's disease, Fronto-temporal dementia, Vascular dementia, Parkinson's disease, and Huntington's disease. They provide messages to the cell by interacting with various ligands, which include hormones, neurotransmitters, and photons. They are the focus of roughly one-third of the medications on the market today. Similarly, the subtype of the serotonin receptor, 5-hydroxytryptamine 2B (5-HT2B), belongs to the G-protein receptor (GPCR) class-A family and is a sensitive class prone to deactivation and activation. There has been an increasing interest in the structural geometry of the receptor upon ligand binding to the allosteric site. The cavities at the receptor-lipid interface are an unusual allosteric binding region that presents numerous issues concerning ligand interactions and stability, binding site conformation, and how the lipid molecules alter all these molecular modeling mechanisms provide an insight into the docking and binding of drug and structural variations. For instance, ligand recognition in the neuronal adenosine receptor type 2A (hA2AR), a GPCR related to various neurodegenerative disorders, was investigated for its affinity against an inhibitor in a solvated neuronal-like membrane in metadynamics. The study provided a factual description of atomic interactions between the ligand and the receptor. It was supported by in vitro binding affinity studies for highlighting the importance of membrane lipids and protein extracellular loop regions, thus, providing valuable input for ligand design and targeting GPCR. Since 5HT is essential as a target for various pharmaceutical and recreational drugs, studies are gaining pace regarding its seven subtypes. In research, general molecular design is carried out, including homology modeling, docking, dynamics, and a hallucinogen-specific chemogenomics database for pharmacological analysis of small molecules and their potential targets. The analogs of piperidine and piperazine moieties were investigated against the 5HT2A receptor via pharmacophore modeling, 3D-Quantitative Structure-Activity Relationship (3D-QSAR), Molecular docking, and Absorption Distribution Metabolism Excretion (ADME) studies. With the onset of multiscale molecular modeling, it is now possible to apply multiple levels of theory to a system of interest, such as assigning chemically relevant regions to high quantum mechanics (QM) theory while treating the rest of the system with a classical force field (molecular mechanics (MM) potential). Several groups have explored the atomic level of interaction between the ligand and the allosteric site via molecular docking and dynamics simulations, followed by quantum chemical calculations to achieve specific results and strengthen the analysis. Quantum Mechanics/Molecular Mechanics (QM/MM) is employed by considering conformational plasticity to identify the critical binding site residues responsible for modifying GPCR function. By this path, the geometry of the receptor is analyzed either by fixing its position w.r.t. to the ligand or by choosing a bound ligand. Finally, structure-based drug design (SBDD) methodologies will be more efficient. Density Functional Theory (DFT) calculations reveal the stabilization of the molecular structure to depict the interactions. Various study groups also practice Fragment-based lead discovery methods for GPCR-based drug discovery. Creating leads from fragments is complicated, accurate, and dependable computational methods are employed to explore G protein-coupled receptor as a target via molecular dynamics simulations and the free energy perturbation approaches (MD/FEP). The overall knowledge of GPCR-mediated signaling can be expanded using such computational approaches.
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Groenenberg, Remco, Peter Fokker, and Marinus den Hartogh. "Salt production." In Geology of the Netherlands. Nieuwe Prinsengracht 89 1018 VR Amsterdam Nederland: Amsterdam University Press, 2025. https://doi.org/10.5117/9789463728362_ch16.
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Abstract In the Netherlands salt deposits are present within the Permian and Triassic intervals. The salt units in the upper Permian Zechstein Group attain especially great thicknesses (up to 1000 m) in the north of the country and the adjacent offshore areas. Salt is produced by solution mining in the eastern and northern Netherlands: rock salt from the Triassic Röt Formation and the Permian Zechstein Group and magnesium salt from the Zechstein Group. Total production amounts to 5.5-6.7 Mt/yr of rock salt and 0.25-0.30 Mt/yr of magnesium salt. Exploitation takes place between appx. 500 and 3000 m, the mining of Permian rock salt in the Barradeel concessions being the deepest worldwide. The rock salt is mainly used for the manufacturing of chlorine; most of the magnesium salt is used to produce magnesium oxide. The lifecycle of a salt mining concession can be divided into five phases: exploration, development and production, suspension, abandonment, and after-care. Optionally, a sixth phase, inbetween production and suspension, can be to use the salt caverns (large brine-filled cavities in the salt that develop during production) for storage of a gas (natural gas, nitrogen, hydrogen, air) or a liquid (oil products). The environmental effects of salt mining are largely comparable to the mining effects of oil and gas operations in the Netherlands. Mining can result in ground subsidence, excess noise levels from drilling and production processes and production of saline wastewater. These effects also include the requirement for pipelines and cables installation as well as the (temporary) change of mostly agricultural land usage, hence changing the landscape to a limited extent.
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Jordan, David, Louise Mawn, and Richard L. Anderson. "Orbital Bones." In Surgical Anatomy of the Ocular Adnexa. Oxford University Press, 2012. http://dx.doi.org/10.1093/oso/9780199744268.003.0009.
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The paired orbital cavities are formed by the facial bones and serve as sockets for the eyes. The orbital bones and the structures contained within the orbit (connective tissue, fat, nerves, vessels) act to support, protect, and maximize the function of the eye. In form, the orbit is roughly a quadrilateral pyramid with rounded angles and resembles a pear. Its volume in the average individual is 30 cc, of which the eyeball contributes about 7.5 cc (range: 6.9–9.0 cc). There are four surfaces: the roof, floor, lateral wall, and medial wall. The base of the pyramid is the opening onto the face (orbital entrance) and is circumscribed by the orbital margin (or orbital rim). The orbit narrows inward to its termination, the apex. The widest portion of the orbital cavity lies 5 to 10 mm behind the orbital rim. The orbit is made up of seven bones: frontal, sphenoid, zygomatic, malar, palatine, lacrimal, and ethmoid. Superiorly, the orbit is bordered by the anterior cranial fossa and the frontal sinus. Nasally, the ethmoid sinus is separated from the medial orbital wall by the thin lamina papyracea of the ethmoid bone. Inferiorly, the maxillary sinus lies beneath the orbital floor. The lateral orbit is bordered anteriorly by the temporalis fossa, and posteriorly it borders the middle cranial fossa. The lateral and medial walls of each orbit form an angle of approximately 45 ° with each other. The two medial walls diverge somewhat posteriorly but are almost parallel to each other (being about 3 mm farther apart posteriorly than at the orbital margin). The lateral orbital walls of the two orbits form a 90 ° angle with each other. The four walls of each orbit converge posteriorly toward the apex, where the optic canal and superior orbital fissure pass into the middle cranial fossa. The overall dimensions of the orbit, especially its depth, are quite variable. An orbital surgeon cannot rely on precise measurements as a guide to the exact location of the optic canal or superior orbital fissure.
Conference papers on the topic "Temporal cavities"
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Gorza, Simon-Pierre. "Dissipative Temporal Solitons in Coherently Driven Phase Modulated Cavities and in Active PT-Symmetric Dimers." In Nonlinear Photonics, NpTu3C.5. Washington, D.C.: Optica Publishing Group, 2024. https://doi.org/10.1364/np.2024.nptu3c.5.
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We discuss recent results on the manipulation of temporal Kerr cavity solitons by external potentials and on the spontaneous formation of pulses by mode-locking in active PT-cavities. Our experimental demonstrations are performed with fiber resonators. Full-text article not available; see video presentation
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Castrignano, S., I. Ricciardi, T. Hansson, and S. Wabnitz. "Quadratic Optical Frequency Combs." In CLEO: Applications and Technology, JTu4K.1. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_at.2024.jtu4k.1.
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Cheng, Xiang, Kai-Chi Chang, Yujie Chen, Murat Can Sarihan, and Chee Wei Wong. "Dual quantum comb generation via cascaded cavities." In CLEO: Fundamental Science, FTu4F.2. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_fs.2024.ftu4f.2.
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We demonstrated the dual quantum comb generation via a cascaded cavities scheme. The dual quantum comb state is examined via temporally-resolved correlation measurements, verifying the quantum coherence of the constituent quantum comb states.
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Hansson, T., D. Modotto, and S. Wabnitz. "Complex temporal dynamics in optical cavities." In 2015 Spatiotemporal Complexity in Nonlinear Optics (SCNO). IEEE, 2015. http://dx.doi.org/10.1109/scno.2015.7324038.
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Mazor, Y., M. Cotrufo, and A. Alu. "Unitary Energy Transfer Between Coupled Cavities Using Temporal Switching." In 2021 Fifteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials). IEEE, 2021. http://dx.doi.org/10.1109/metamaterials52332.2021.9577101.
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Dunlop, A. M., W. J. Firth, G. K. Harkness, and E. M. Wright. "Spatio-Temporal Master Equation for Folded Resonators." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cthi5.
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We recently presented a spatio-temporal master equation (ME) model for describing the evolution of optical fields in laser cavities [1]. This ME is a paraxial wave equation with a propagation operator explicitly dependent on the ABCD elements of the cavity. It exactly reproduces the cavity mode structure in the linear case, and gives excellent agreement with the more exact Huygens’ integral method when nonlinearity is added, e.g. for laser cavities containing a Kerr lens and a gaussian aperture [1].
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Bartolo, A., N. Vigne, M. Marconi, G. Beaudoin, K. Pantzas, I. Sagnes, A. Garnache, and M. Giudici. "Spatial Multiplexing of Temporal Localized Structures in Degenerate Optical Cavities." In 2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC). IEEE, 2023. http://dx.doi.org/10.1109/cleo/europe-eqec57999.2023.10232687.
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Cooper, Lauren, Qiang Du, Dan Wang, Mathew Whittlesey, Siyun Chen, Deepak Sapkota, Jeroen van Tilborg, et al. "Coherent Temporal Stacking of Tens-of-fs Laser Pulses." In CLEO: Science and Innovations. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/cleo_si.2023.sf1n.6.
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We theoretically prove coherent pulse stacking can accommodate tens-of-fs pulse lengths when stacking large number of pulses. Experimental validation shows high-efficiency stacking of nine, 50fs bandwidth pulses with four Gires-Tournois Interferometric (GTI) cavities.
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Cao, Hui. "Spatio-temporal lasing dynamics in wave-chaotic and disordered cavities (Conference Presentation)." In Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVII, edited by Takuo Tanaka and Din Ping Tsai. SPIE, 2019. http://dx.doi.org/10.1117/12.2525131.
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Greif, J., E. Miltenyi, I. Fischer, and W. Elasser. "Spatio-Temporal Dynamics of Broad Area Semiconductor Lasers in Long External Cavities." In EQEC'96. 1996 European Quantum Electronic Conference. IEEE, 1996. http://dx.doi.org/10.1109/eqec.1996.561712.
Full textReports on the topic "Temporal cavities"
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Sun, S., F. R. Brunton, T. R. Carter, J. R. Clarke, H. A J Russell, K. Yeung, A. Cachunjua, and J. Jin. Porosity and permeability variations in the Silurian Lockport Group and A-1 carbonate unit, southwestern Ontario. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331902.
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This is the first regional porosity/permeability study to incorporate petroleum industry laboratory core analyses submitted to the Ontario government and managed by Ontario's Oil Gas and Salt Resources Library. This study comprises 11,759 analyses for the Early Silurian Lockport Group of southwestern Ontario from 150 drill cores. The Lockport Group consists of a cyclic succession of dolostones and minor limestones comprising, in ascending order: Gasport, Goat Island, Eramosa, and Guelph formations. This stacked carbonate succession was deposited on an eastward-deepening carbonate ramp, extending from Michigan, through southwestern Ontario, to Ohio, Pennsylvania and New York. It is overlain disconformably by restricted marine carbonates, evaporites and mixed shales of the Salina Group, whereas unconformably underlain by one of four formations that include, the Lions Head (a stratigraphic equivalent of part of the Rochester), DeCew, Rochester and Irondequoit. To ensure appropriate stratigraphic assignment of the laboratory test intervals, a quality assurance/quality control review on formational tops was carried out on the 150 cores that were tested. This regional subsurface work resulted in the reassignment of 846 formation tops that were verified by examination of drill core, drill cuttings, and geophysical well data including gamma-ray, neutron and density logs. Core analysis datasets have been validated by summarizing laboratory protocols and standards and reconciling data fields in the core analysis database with auxiliary data, including geophysical logs, thin sections, and core examinaion. This auxiliary data was then used to identify data outliers to update the core analysis database. The measurements of porosity and permeability were then assigned a formation rank plotted on a subregional scale. Average porosity and permeability values have been divided into statistical populations for each formation assigned by three depositional realms. The southwestern Ontario study area has been divided into three paleogeographic settings, based on distinctive lithofacies that correspond to different carbonate depositional regimes and regions of paleokarstification. From northwest to southeast, the lithofacies reflect an inner to outer carbonate ramp setting designated as area 1-3 from northwest to southeast. Area 1 is the inter-pinnacle karst region and includes some of thepinnacle structures within the Lockport Group. This region has the most significant paleokarstification of the upper Lockport Group (Guelph and Goat Island formations) and overlying Salina Group A-unit. Area 2 has rare pinnacle structures, where no porosity/permeability core analyses data are available. Area 3 is the middle to outer portion of the Lockport carbonate ramp, with local development of reef mound phases in the lower Goat Island and Gasport formations. The porosity and permeability variability corresponds with areal distribution of paleokarstification and resulting diagenetic phases in Area 1, and lithofacies variations and temporal/spatial history of karstification in Area 3. Higher porosity and permeability generally coincide with greater thicknesses of the oil and gas reservoir within pinnacles in Area 1 and reef mound phases of Lockport Group and lower Salina Group A-1 Carbonate in Area 3. Within inter-pinnacle karst regions in Area 1, average porosity for each formation is consistently high with little variations. In Area 3, a general increase of porosity and permeability towards the southeast corresponds with lithofacies ranging from restricted lagoonal/platform interior deposits to carbonate bank deposits with local development of reef mound phases in the Gasport and Goat Island formations. There has been significant erosion and karstification within and at the tops of these pinnacles, resulting in higher porosity and permeability of the Guelph and upper Goat Island formations, and the overlying Salina Group A-1 unit. Paleokarstic events have enhanced various porosity types, including intercrystalline, moldic, irregular and fenestral vugs, and cavities.