Literatura científica selecionada sobre o tema "Canal de réception unique"
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Artigos de revistas sobre o assunto "Canal de réception unique"
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Courty, Jean-Michel, e Édouard Kierlik. "Un canal à sens unique ?" Pour la Science N° 539 – septembre, n.º 9 (7 de setembro de 2022): 88–90. http://dx.doi.org/10.3917/pls.539.0088.
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Loucif, Sabine. "Linda Lê: Le territoire littéraire comme carte de soi". L'Esprit Créateur 63, n.º 4 (dezembro de 2023): 125–35. http://dx.doi.org/10.1353/esp.2023.a919694.
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Abstract: L'article explore la question de la postérité de Linda Lê à partir d'une analyse de réception qui remet en cause le label d'écrivain francophone – au sens postcolonial du terme – qui lui est souvent attribué. La position de l'auteur dans le champ littéraire français et dans le système littéraire francophone est appréhendée ainsi que la réception de son livre le plus directement autobiographique, À l'enfant que je n'aurai pas . Il apparait ainsi que Linda Lê réinvente son capital culturel pour se positionner de façon unique sur le territoire de la littérature.
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Aggarwal, Krittika, Bhupendra Kumar Jain, Naveen Sharma e Sunny Goel. "Pilonidal sinus of anal canal: a possible unique diagnosis". ANZ Journal of Surgery 85, n.º 9 (setembro de 2015): 693–94. http://dx.doi.org/10.1111/ans.13030.
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Venumuddala, Vijay Reddy, M. Sridhar, M. Rajasekaran, Saravanan Poorni e Gnanaprakasam Senthilkumaran. "Endodontic Management of Mandibular First Molar with Middle Distal Canal: A Case Report". Case Reports in Dentistry 2012 (2012): 1–4. http://dx.doi.org/10.1155/2012/458079.
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The knowledge of variations in root canal morphology is critical for a successful endodontic treatment. This article presents the endodontic management of a unique case of mandibular molar with middle distal canal which is quite uncommon.
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Naccarato, Mario. "La fiducie : réflexion sur la réception judiciaire d’un nouveau code." Note 48, n.º 3 (12 de abril de 2005): 505–24. http://dx.doi.org/10.7202/043939ar.
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Dans le Code civil du Québec de 1994, le législateur a innové en adoptant le concept original de patrimoine d’affectation pour encadrer la fiducie. Ce patrimoine n’est rattaché à personne. Ainsi, les biens qu’il comporte n’appartiennent à personne ! Contrairement à la fiducie du Code civil du Bas Canada, la nouvelle fiducie du Code civil du Québec permet une grande flexibilité dans sa création et son exécution. Aussi, elle permet a priori aux constituants d’en tirer une série de bénéfices, tout comme s’ils étaient propriétaires des biens composant le patrimoine fiduciaire. Voilà qui concorde mal avec le droit civil québécois, où le patrimoine constitue le gage commun des créanciers. En permettant la création d’un patrimoine où le constituant peut se réserver les fruits et le capital, le législateur québécois a créé un mécanisme qui se heurte au caractère personnaliste et traditionnel du patrimoine, unique à la personne. Autrement dit, nul ne peut détenir plus d’un patrimoine. La jurisprudence et, en particulier, la Cour suprême du Canada viennent le confirmer. Dans le présent article l’auteur s’emploie à démontrer que la jurisprudence limitant la portée des droits que peut se réserver le constituant d’une fiducie repose sur une série de concepts plus fondamentaux qu’il n’en appert à sa simple lecture.
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Singh, Rakesh Kumar, Sangita Bhandary, Bimal Kumar Sinha e Prahlad Karki. "Penetrating injury of parotid gland and external auditory canal: a unique combination". Journal of Laryngology & Otology 118, n.º 12 (dezembro de 2004): 977–79. http://dx.doi.org/10.1258/0022215042790493.
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A unique case is presented of a penetrating injury of the parotid gland and complete transection of the cartilaginous portion of the external auditory canal by a tree branch. A subsequent superficial parotidectomy along with end-to-end anastomosis of the external auditory canal and appropriate antimicrobial therapy was successful. A review of the literature did not reveal any previous similar cases.
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Ahuja, Kritika, Sachin Gupta e Vineeta Nikhil. "Role of Comprehensive Diagnostic, Imaging and Treatment Strategies in Endodontic Retreatment of a Maxillary Molar with Unusual Anatomy: A Case Report". International Journal of Research and Review 8, n.º 6 (29 de junho de 2021): 155–59. http://dx.doi.org/10.52403/ijrr.20210619.
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An appreciation of the anatomic complexity of the root canal system is essential at every step of endodontic treatment. Endodontic treatment of teeth with unusual root canal anatomy presents a unique challenge. This clinical case report presents the application of cone beam computed tomography as a useful imaging technique in endodontics for the management of teeth with aberrant anatomy. Failure to detect an extra canal may lead to treatment failure. The current report presents the management of a previously endodontically treated maxillary first molar with missed additional mesiobuccal and distobuccal canals. Keywords: CBCT, Canal Morphology, Maxillary molar, Missed canal, Retreatment.
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Rutherford, Scott A., Kim M. Linton, Jonathan M. Durnian e Richard A. Cowie. "Epidural meningioma of the sacral canal". Journal of Neurosurgery: Spine 4, n.º 1 (janeiro de 2006): 71–74. http://dx.doi.org/10.3171/spi.2006.4.1.71.
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✓ Spinal meningiomas are reported infrequently as pure epidural tumors, and they are rarely located at the caudal end of the spine. The unique combination of a wholly epidural tumor confined entirely to the sacral canal has not been previously described. The authors describe the case of a 29-year-old man who presented with coccygeal and left-sided S2–4 dermatomal pain. Examination confirmed sensory loss in the same distribution. A magnetic resonance image revealed an enhancing mass lesion in the sacral canal scalloping the bone at S-2 and S-3. An apparent complete resection was performed. Intraoperatively the authors observed an entirely epidural tumor with a small dural attachment at the most caudal end of the thecal sac. Histological examination confirmed that the tumor was an atypical meningioma. A local recurrence developed within 1 year of surgery, and the patient underwent a hemisacrectomy for tumor removal. An additional recurrence in the lumbosacral spine and multiple pulmonary metastases developed thereafter. In addition to the unique nature of this case, the authors also observed a tumor behaving in a far more aggressive fashion than its histological findings would suggest. This adds to the differential diagnosis of tumors occurring in the sacral canal.
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Yang, Nathaniel. "Eye Movement Autophony: A Unique Presenting Symptom of Semicircular Canal Dehiscence Syndrome". Philippine Journal of Otolaryngology Head and Neck Surgery 35, n.º 1 (17 de maio de 2020): 74–75. http://dx.doi.org/10.32412/pjohns.v35i1.1301.
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A 31-year-old woman presented with the very unusual symptom of being able to hear the movement of her eyeballs in her left ear: “I can hear my eyeballs move!” She initially described hearing a recurrent “swishing” sound that would occur intermittently. She eventually realized that its occurrence coincided with eyeball movement. In the eight months’ duration of her symptom, she had been unable to obtain a diagnosis from physicians whom she consulted and had even been referred for psychiatric evaluation and treatment. An otolaryngologist whom she consulted had a standard pure tone audiometric examination done, and this showed normal hearing acuity in both ears. A Magnetic Resonance Imaging (MRI) of the inner ear and brain likewise showed no abnormalities. Due to the peculiarity of the patient’s complaint, the otolaryngologist consulted with a neurotologist who suspected the presence of a semicircular canal dehiscence. A computerized tomographic imaging study of the temporal bone confirmed the presence of a left superior semicircular canal dehiscence syndrome. (Figures 1 & 2)
First described by Minor et al. in 1998, superior semicircular canal dehiscence syndrome is a neurotologic condition that characteristically presents as vertigo, oscillopsia, and/or disequilibrium induced by sound or changes in middle ear or intracranial pressure.1 Subsequent clinical studies described the presence of audiologic symptoms, the most prominent of which were conductive hearing loss and autophony with or without vestibular manifestations.2 Patients described an increased sensitivity to internally generated bone-conducted sounds, such as the heartbeat, chewing, footsteps hitting the ground and eye movements. It is of particular interest that the ability to hear one’s own eye movements, a condition known as eye movement autophony, currently appears to have been described as a symptom only in patients with semicircular canal dehiscence syndrome.3 Anecdotally, although the author of this report has diagnosed quite a number of patients with semicircular canal dehiscence syndrome manifesting primarily with vestibular symptoms, this particular case is the only one that presented with eye movement autophony as the primary and only symptom.
Although the patient was not physically incapacitated by vertigo or chronic disequilibrium, she was significantly bothered by the unrelenting nature of her particular symptom. She subsequently underwent a transmastoid plugging of the superior semicircular canal which completely relieved her of the symptom.
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Demierre, Bertrand, Aymen Ramadan, Hermann Hauser, Alain Reverdin, Bénédict Rilliet e Jean Berney. "Radicular Compression Due to Lumbar Intraspinal Gas Pseudocyst: Case Report". Neurosurgery 22, n.º 4 (1 de abril de 1988): 731–33. http://dx.doi.org/10.1227/00006123-198804000-00018.
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Abstract A case of sciatic pain syndrome is reported. Computed tomography showed evidence of gas in the spinal canal, and at operation a gas-filled pseudocyst was found in the spinal canal, without herniated disc. The cause of this unique case is discussed in relation to the spinal vacuum phenomenon.
Teses / dissertações sobre o assunto "Canal de réception unique"
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Dionne, Bernard. "Étude et analyse temps réel d'un canal de réception GPS". Mémoire, École de technologie supérieure, 2006. http://espace.etsmtl.ca/531/1/DIONNE_Bernard.pdf.
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Dans le cadre de ce travail, nous avons analysé les performances d'un récepteur GPS numérique reprogrammable. Avec le développement de plus en plus rapide des systèmes GNSS, le besoin en récepteur numérique reprogrammable est devenu obligatoire pour toutes entreprises voulant concurrencer dans le domaine du positionnement satellitaire. À l'instar de ce que le SDR a fait pour l'évolution du cellulaire, le récepteur numérique reprogrammable se veut une première analyse des possibilités dans ce domaine.
La démarche utilisée durant cette recherche nous a permis d'identifier une plate-forme de développement de base pour l'implémentation du récepteur. L'analyse des variables d'environnements des signaux GPS a établi les balises pour la recherche des processeurs dans lesquels le récepteur sera implémenté. Il a été identifié que le récepteur sera divisé entre deux processeurs, c'est-à-dire un FPGA et un DSP, en raison des différents algorithmes compris à l'intérieur des boucles qui composent le modèle du récepteur GPS.
Afin d'arriver à implémenter un récepteur dans les processeurs, nous avons modélisé, à l'aide de Matlab/Simulink, une chaîne de communication GPS, de la source au récepteur. Après la modification de ce modèle pour générer un code binaire, la première étude du récepteur numérique a clairement montré que, pour un rapport signal à bruit plus faible que dans le cas d'un récepteur analogique, les performances du récepteur numérique sont nettement supérieur à ceux des récepteurs analogiques existants.
Pour réaliser un modèle plus réaliste, les perturbations appliquées sur le signal GPS ont pu démontrer que le récepteur numérique répondait plus rapidement à un stress dynamique important. De plus, la conception d'un tel récepteur pourrait être fastidieuse mais la méthodologie implémentée simplifie la programmation à un minimum, permettant ainsi à tout développeur mathématique de pouvoir réaliser son propre récepteur.
Les résultats de ce travail tout comme l'expertise acquise sont utilisés actuellement pour le développement d'un récepteur hybride complet, basé sur le concept du software defined navigator(SDN).
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Avital, Pierre. "Optimisation de la commutation d'antennes et détection de passagers par SVM, dans un contexte de contrôle d'accès pour véhicule". Electronic Thesis or Diss., université Paris-Saclay, 2021. http://www.theses.fr/2021UPASG049.
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Cette thèse étudie deux aspects d'un système de contrôle d'accès de véhicule par localisation de clés.D'une part, dans le cadre d'une localisation par triangulation à l'aide de réseaux de capteurs commutés, l'optimisation de la séquence de commutation est étudiée.Un modèle est proposé pour étudier l'estimation des paramètres de sinusoïdes reçues par un réseau de capteur, dont les capteurs sont échantillonnés de manière asynchrone.Ce modèle est notamment, mais pas exclusivement, applicable à des approches industrielles telles que celle proposée par Bluetooth 5.1, qui sert d'application de référence.Du modèle sont dérivées des bornes de Cramér-Rao, qui servent à l'établissement de critères d'optimisation des instants d'échantillonnage de chaque capteur indépendants de la géométrie du réseau de capteurs.Les formes analytiques de ces critères permettent d'établir des propriétés préférables pour les instants d'échantillonnage de chaque capteur, particulièrement lorsque la fréquence des signaux reçus n'est pas connue à priori.Des stratégies sont proposées pour générer des séquences de commutation, et sont évaluées numériquement à l'aide des critères proposés. L'évolution des critères proposés est comparée à celle de bornes numériques sur l'estimation d'angle d'incidence pour des géométries populaires, illustrant un lien qualitatif entre ces critères.D'autre part, dans le cadre d'une localisation par mesure des délais de propagation en bande UWB, un système de détection de passagers reposant sur le matériel de localisation est proposé.On propose d'utiliser des machines à vecteurs-supports (SVM) pour réaliser la détection des passagers sous la forme d'une classification des réponses impulsionnelles de canal mesurées entre les transmetteurs du système de localisation de clé.Une preuve de concept et un prototype sont réalisés et utilisés pour collecter des données sur le problème et montrer la faisabilité.L'étude de ces données permet d'identifier des invariances, que l'on propose de traduire pour les SVM à travers des traitements et métriques adaptés.Les performances offertes par ces traitements sont ensuite mesurées expérimentalement, et permettent d'affirmer qu'un des traitements proposés est avantageux pour l'application choisieThis thesis studies two aspects of a vehicle access control system which relies on the estimation of a key's location to grant access.Firstly, within the context of a triangulation-based system, we study the optimisation of the switching sequence for switched antenna-arrays.A model is given to study the estimation of the parameters of sines received by a switched array, where sensors are not necessarily sampled synchronously.This model is relevant, but not exclusive, to industrial approaches to direction of arrival estimation, such as the one proposed by Bluetooth 5.1, which serves as our reference application.From the model, Cramér-Rao lower bounds are computed, and are used to define design criteria for switching sequences that do not rely on the array's geometry.These criteria's analytical forms allow us to highlight desirable properties in switching sequences, especially in the case where the signal's frequency is unknown.Strategies to build switching sequences are proposed, and numerically evaluated using the provided criteria. Comparison of the criteria with numerical bounds on direction of arrival for common array geometries shows that they are qualitatively linked.Secondly, within the context of a time of flight based system, we propose a system for passenger detection that relies solely on the localization system's original hardware.To achieve this, we propose to use support vector machines (SVM) to classify the channel impulse responses measured between the system's transmitters.A proof of concept is designed to demonstrate feasability, and data is collected on a prototype for further evaluation.By studying the available data, invariants are identified, and processing functions are proposed to translate these invariants to the SVM in order to improve performance.One of the proposed processing is shown to give performance gains for our application through experiments
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Langlais, Charlotte. "Etude et amélioration d'une technique de réception numérique itérative : turbo-égalisation". Rennes, INSA, 2002. http://www.theses.fr/2002ISAR0007.
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L'objectif de cette thèse est d'étudier et d'améliorer une technique de réception numérique appelées turbo-égalisation et basée sur le principe turbo. Ce sytème est consistuté de pluusieurs fonctions qui traitent itérativement les différentes perturbations apportées par le canal de propagation. L'Interférences Entre Symboles (IES) est corrigée par un égaliseur particulier appelé annuleur d'interférences construit à l'aide de filtres optimisés selon le critère de Minimum d'Erreur Quadratique Moyenne (MEQM). Le bruit et l'IES résiduelle sont ensuite traités par un décodeur de canal. Chaque fonction produit une information souple sur les données émises qui est améliorée à chaque traitement. L'IES est ainsi éliminée progressivement aux cours des itérations.
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Abdaoui, Abderrazek. "Etudes de la capacité du canal ionosphérique et de la réception par turbo-égalisation adaptative". Paris, CNAM, 2006. http://www.theses.fr/2006CNAM0550.
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Cette thèse se propose pour objectif de caractériser la capacité théorique du canal ionosphérique et d'améliorer l'estimation du canal, dans une technique de réception numérique par voie ionosphérique, appelée turbo-égalisation. La capacité a été traitée par Lee et Ozarow pour les canaux radio-mobiles TDMA : ceux-ci supposent que l'atténuation d'amplitude de chaque trajet suit une loi de Rayleigh, sans toutefois, préciser les paramètres de cette loi. C'est pourquoi la première partie de ce travail présente une extension des travaux de Lee et d'Ozarow pour les canaux non-stationnaires, tel que le canal ionosphérique. Une expression théorique générale de la capacité a été mise en place en fonction de l'étalement Doppler, ce qui contribua, de façon fort intéressante, à la caractérisation des canaux ionosphériques. Elle permet, en effet, de donner une idée claire sur la limite théorique du débit transmissible par voie ionosphérique en présence d'étalement Doppler et d'interférences entre symboles, créés par les trajets multiples. Cette étude théorique a été finalisée par une application d'estimation de la capacité sur une réalisation réelle du canal ionosphérique, effectuée le jour de l'éclipse solaire du 11 août 1999. Une deuxième partie, étudie et caractérise les estimateurs susceptibles d'être utilisés dans une chaîne de réception ionosphérique à base de turbo-égalisation. En effet, les estimateurs du gradient stochastique (GS) Least Mean Squared (LMS), les algorithmes des moindres carrés récursifs (MCR) Recursive Least Squared (RLS) et le filtre de Kalman (KF) ont fait l'objet d'optimisations des paramètres et de comparaisons, dans un contexte ionosphérique réel et simulé. Ces optimisations et ces comparaisons, nous ont permis de retenir les estimateurs MCR et Kalman comme les plus performants dans un contexte ionosphérique non stationnaire. Enfin, la dernière partie de cette thèse concerne l'implémentation de la turbo-égalisation à base de l'égaliseur linéaire MMSE à entrées sorties souples Soft Input Soft Output (SISO) et des estimateurs MCR et Kalman sur le canal ionosphérique réel et simulé. Le format des trames utilisé a suivi les spécifications de la norme STANAG 4285, nécessaire dans la conception des modems hautes fréquences (HF). Les performances, mesurées en taux d'erreurs par bit et erreurs d'estimation, ont été évaluées par variation du rapport signal à bruit et de l'étalement Doppler. L'estimation par filtre de Kalman a favorisé la réception de façon plus performante que l'algorithme RLSThe aim of this thesis is to characterize the theoretical capacity of the HF ionospheric channels and to improve the estimate in a receiver based on turbo-equalization. The capacity was treated by Lee and Ozarow for TDMA radio-communications using the hypothesis that each path attenuation is a Rayleigh random variable. This hypothesis is used without specifying any parameter. In a first part, this thesis presents an extension of Lee and Ozarow results for the non-stationary environments such as the ionospheric channel. A general theoretical capacity formula versus the Doppler spread is developed and it is an interesting contribution for the non-stationary channels. This one makes it possible to give a clear idea on the theoretical achievable bit rate of an ionospheric link affected by Doppler spread and inter symbol Interferences (ISI). The theoretical approach was finalized by an application to a real ionospheric communications link realized during the eclipse day (August 11, 1999). In a second part of this thesis, we studied and characterize the estimators likely to be used in the ionospheric turbo-equalizer based on linear filtering. Indeed, the estimators, such as Least Mean Squared (LMS), Recursive Least Squared (RLS) and Kalman filters (KF), were the subject of optimizations and comparisons in a real and simulated ionospheric environments. The optimization and comparisons, enabled us to choose the RLS and the Kalman estimators as being most performant (powerful) in the non stationary ionospheric channel. In a second part of this thesis, we studied and characterize the estimators likely to be used in the ionospheric turbo-equalizer based on linear filtering. Indeed, the estimators, such as Least Mean Squared (LMS), Recursive Least Squared (RLS) and Kalman filters (KF), were the subject of optimizations and comparisons in a real and simulated ionospheric environments. The optimization and comparisons, enabled us to choose the RLS and the Kalman estimators as being most performant (powerful) in the non stationary ionospheric channel. The last part of this thesis relates to the implementation of MMSE turbo-equalizer based on Soft Input Soft Output SISO principal and on RLS and Kalman estimators in the real and simulated ionospheric channel. The transmission is continie in time and the frame pattern is based on the STANAG 4285 HF modem specifications. The performances in bit error rate and the Mean Squared Error (MSE) were evaluated versus signal to noise ratio and Doppler spread. With respect to bit error rate and mean squared error, the estimations based on Kalman filter was more powerful than that using RLS algorithm
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Farah, Francis Joumana. "Etude des systèmes de traitement numérique de canal pour la réception radio-mobile UMTS/TDD". Grenoble INPG, 2002. http://www.theses.fr/2002INPG0070.
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Ben, Salem Farah. "Réception particulaire pour canaux multi-trajets évanescents en communications radiomobiles". Toulouse 3, 2002. http://www.theses.fr/2002TOU30142.
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Nivole, Franck. "Réception de la DVB-T en mobilité : analyse du canal en diversité d'antennes et traitements numériques associés". Rennes 1, 2008. http://www.theses.fr/2008REN1S130.
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Depuis l’apparition des premières télédiffusions numériques françaises en 2005, la question de la réception en mobilité s’est souvent posée. Au delà des choix normatifs qui tendent à préférer la norme DVB-H aux normes actuelles DVB-T, la question des usages et de la qualité vidéo restent une question clé. L’ensemble des travaux déjà entrepris pour rendre la télévision numérique nomade ne permet pas à l’heure actuelle d’offrir un confort suffisant pour des applications embarquées « haut de gamme » telles que celles souhaitées dans l’automobile, le train, etc. Pour améliorer la qualité de service, une des techniques utilisées est la réception en diversité. En DVB-T, les applications et études actuelles offrent peu d’éléments sur les phénomènes de propagation. Les choix algorithmiques de diversité, qui sont effectués dans ce contexte, sont alors arbitraires. Le projet CAVITE propose, par une analyse du canal de propagation, de faire des choix algorithmiques différents. Cette thèse se décline donc en trois sous-ensembles : Le premier est la réalisation d’un système multivoies capable à la fois de réaliser un sondage temporel et spatial du canal de propagation en mobilité, par le biais de la réception des signaux DVB-T télédiffusés. Le deuxième est de réaliser et d’analyser un ensemble de mesures caractérisant le canal de propagation afin de dégager une stratégie de traitement en diversité. Enfin, le troisième est de proposer et de tester de nouveaux algorithmes et paramètres permettant d’améliorer la réception en mobilité du signal de télédiffusion. Cette thèse a donc pour objectif de permettre une meilleure visibilité des phénomènes de propagation en DVB-T et vis-à-vis des ces derniers, de proposer une stratégie adaptée à la réception de la télévision numérique mobile. Par projection, cette thèse pourra également permettre aux acteurs de la télédiffusion tels que le DAB, le T-DMB, l’ATSC de faire les mêmes choix pour améliorer la réception en mobilité de ce type de systèmes numériques qui utilise les mêmes fondamentaux de modulation et de réseauxSince the advent of the first French digital television broadcasts in 2005, the question of mobility reception has been often asked. Beyond the normative choices that tend to prefer the DVB-H standard to current DVB-T standards, the question of the uses and video quality remains a key issue. All the work already undertaken to make digital television mobile does not currently provide sufficient comfort for embedded upscale applications such as those desired in car, train, etc. . . To improve the Quality Of Service (QoS), a technique used is the diversity reception. In DVB-T, as applications and current studies do not provide information on propagation phenomena the choices of diversity algorithms, which are made in this context, are arbitrary. The CAVITY project proposes, with an analysis of the propagation channel, to develop and test different algorithms. This thesis is declines in three parts: The first part is to achieve a multi-antenna system able to achieve a temporal and spatial channel sounding in mobility conditions, through the reception of DVB-T broadcast signals. The second part is to achieve measurements to characterize the propagation channel phenomena in order to find a data diversity processing strategy. Finally, the third part is to propose new algorithms and parameters to improve reception mobility of DVB-T signal. The aim of this thesis is to improve visibility of propagation phenomena in DVB-T channel and regarding this knowledge to propose an adapted strategy for the reception of digital television in mobile conditions. By extension, this thesis may also enable to the television actors such as the DAB, T-DMB, ATSC to make the same choices to improve mobility reception of such digital systems that use the same basic modulation principle
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Lepoitevin, Mathilde P. "Conception d'un nanopore unique pour mimer un canal biologique et pour la détection de bio-macromolécules". Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT226/document.
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Un nanopore artificiel est une ouverture de taille nanométrique faite dans un film mince synthétique (polymère ou inorganique). Un nanopore unique peut être considéré comme l’élément simple constitutif d’une membrane. Les récentes avancées dans ce domaine ont ouvert des opportunités pour développer des outils pour la détection de molécules cibles à faible concentration (fmol L-1), en temps réel. Les nanopores artificiels s’inspirent des canaux biologiques situés dans la membrane cellulaire. Ces derniers permettent le transport d’ions ou de molécules entre les milieux intra- et extra-cellulaires, grâce à leurs fortes sélectivités ou leurs propriétés d’ouverture/fermeture. Comparé à leurs homologues biologiques, les limitations des nanopores solides sont leurs manques de sélectivité et de réponse aux stimuli extérieurs. Toutefois, les nanopores solides ont l’avantage d’être beaucoup plus résistant, robuste et facile à manipuler que les pores biologiques. Ainsi la fonctionnalisation de leur surface, avec des systèmes plus ou moins complexes, permettrait d’améliorer à la fois leurs propriétés de transport sélectif, leurs capacités de détection de biomolécules ou encore d’étudier plus précisément les mécanismes fondamentaux du transport des macromolécules en milieu confiné.Dans cette thèse, nous avons conçu dans un premier temps des nanopores bi-fonctionnels, répondant au pH, et à l’attache d’un ligand. Pour fabriquer ces nanopores bi-fonctionnels, nous avons utilisé un système biotine-avidine fixé dans des nanopores polymères. Nous avons démontré qu’il est possible de moduler l’ouverture et la fermeture du nanopore avec le pH de façon réversible. De plus, il est possible de détecter des protéines biotinylées et des anticorps par l’analyse des rectifications de courant. Le principal défaut de cette stratégie est son irréversibilité. En utilisant une stratégie similaire combinée avec des polyélectrolytes, nous avons obtenu des fonctionnalisations réversibles. Ils permettent de moduler la sélectivité ionique du pore et les propriétés de conduction en fonction du pH et de ligand. Dans un second temps, nous nous sommes intéressés aux questions fondamentales de la translocation de polynucléotide, plus précisément de l’analyse de l’influence de l’état de surface du nanopore (hydrophobicité, charge), dans les conditions où la distance de Debye devient équivalente au diamètre du nanopore. Nous avons démontré que si le nanopore présente la même charge que la PolyAdénosine et la PolyCytosine, la vitesse de passage de la molécule augmente et la barrière globale d’énergie d’entrée du nanopore diminue par rapport au nanopore non-chargé hydrophobe. Ensuite, en modifiant la surface d’un nanopore en PET, nous avons montré qu’il est possible de détecter des brins simples et doubles d’ADN très courts (10 à 40 bases). Enfin, nous avons tenté une fonctionnalisation de nanopores pour éviter l’adsorption non spécifique des protéines afin d’étudier la translocation de longs fibrilles d’amyloïdes de lysozyme. Cet objectif n’a pas été complètement atteint compte tenu des résultats qui ne permettent pas d’affirmer quand au passage des molécules à travers le pore.Dans cette thèse nous nous sommes attachés à montrer l’intérêt et la nécessité de fonctionnaliser les pores, aussi bien pour obtenir des nanopores biomimétiques stimuli-répondants (pH et ligand) ou anti-bioadhérants que pour des études fondamentales de transport. Il est également facile de transposer cette technique à des membranes multipores. Il est donc possible de concevoir des membranes optimisées pour des applications de séparation ionique, de capture de molécules cibles ou plus généralement de filtrationArtificial nanopores are nanometer sized aperture made in synthetic thin films (polymer or inorganic). A single nanopore can be considered as a constitutive element from membranes. Recent advances in this field are bringing new tools for real time detection of target molecules at low concentration (fmol L-1). Biological channels inside the cell membrane are used as models to design solid-state nanopores. They allow ions or molecules transport through intra- and extra-cellular side, thanks to their high selectivity and their gating properties. Compared to their biological counterparts, limitations of the synthetic nanopores are their lack of selectivity and unresponsiveness towards external stimuli. However, the solid state presents several advantages compared to the biological ones, such as nanopores robustness, the control of the number of pores and a long lifetime (several days or weeks). Thus their surface functionalization would increase their selective transport properties, their abilities to detect biomolecules or to study more in details their fundamental mechanisms.In this thesis, we design first bi-functional nanopores, pH- and ligand-gated. To do it, we used biotin-avidin system grafted inside a polymeric nanopore. We demonstrated that it is possible to reversibly gate the nanopore with pH modulation. Moreover, we are able to detect protein labeled with biotin and antibodies by analyzing the current rectification. The major drawback comes from the irreversibility of its covalent bonds. By using a similar concept combined with polyelectrolytes, we obtain a reversible functionalization. Depending on the ligand, the ionic selectivity and the conduction properties can be modulated. Next, we focused on fundamental questions regarding polynucleotides translocation, and more precisely on the influence of the surface state of the nanopore (hydrophobicity, charge) when the Debye distance is similar to the pore diameter. We show that if the nanopore has the same charge as the polyAdenosine or polyCytosine, the translocation time decreases, and the energy barrier of entrance decreases compared to an uncharged hydrophobic nanopore. Then, by modifying the surface of the nanopore made in PET film, we are able to detect short single and double strand of DNA (10 to 40 bases). Finally, we tried to functionalize PET nanopores to avoid unspecific adsorption of proteins and to study the translocation of long fibrils of amyloids from lysozyme. This goal has not been entirely reach since we cannot claim that the fibrils translocate through the pore.In this thesis we show the interest and the need to functionalize the nanopores, to obtain biomimetic stimuli-responsive (pH and ligand), to avoid unspecific adsorption or to study transport properties with the nanopore. It is easy to upscale those techniques to multipores membranes. Thus it is possible to design membranes to enhance their ionic separation, target molecule detection or more generally filtration applications
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LANGLAIS, CHARLOTTE. "Etude et amélioration d'une technique de réception numérique itérative : turbo-égalisation". Phd thesis, INSA de Rennes, 2002. http://tel.archives-ouvertes.fr/tel-00008945.
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L'objectif de cette thèse est d'étudier et d'améliorer une technique de réception numérique appelée turbo-égalisation et basée sur le principe turbo. Ce système est constitué de plusieurs fonctions qui traitent itérativement les différentes perturbations apportées par le canal de propagation. L'Interférences Entre Symboles (IES) est corrigée par un égaliseur particulier appelé annuleur d'interférences construit à l'aide de filtres optimisés selon le critère de Minimum d'Erreur Quadratique Moyenne (MEQM). Le bruit et l'IES résiduelle sont ensuite traités par un décodeur de canal. Chaque fonction produit une information souple sur les données émises qui est améliorée à chaque traitement. L'IES est ainsi éliminée progressivement au cours des itérations.Grâce à une analogie avec les modulations codées, nous expliquons l'influence du schéma d'entrelacement, qui peut être réalisé au niveau des bits ou des symboles de modulation, sur les performances de la turbo-égalisation selon les caractéristiques temporelles des canaux de propagation. D'autre part, afin d'obtenir des performances satisfaisantes sur un modèle de canal ionosphérique, dont les caractéristiques de propagation sont réputées difficiles, nous étudions les différentes structures et algorithmes d'adaptation possibles pour les égaliseurs présents dans la turbo-égalisation. Puis nous présentons des améliorations de la conversion Maire-binaire sans information a priori. Une optimisation du mapping pour la conversion Maire-binaire avec information a priori de la turbo-égalisation est proposée et conduit à un gain de performances en terme de Taux d'Erreurs Binaires. Enfin nous comparons la turbo-égalisation à trois techniques alternatives : un système avec turbo-décodage, la technique multiporteuse COFDM, et un turbo-détecteur à treillis réduit.
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Hénaff, Françoise. "Réception optimale en présence de trajets multiples et d'effet doppler : Application aux transmissions sur canal acoustique sous-marin". Brest, 1993. http://www.theses.fr/1993BRES2017.
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L'etude presentee dans cette these porte sur l'evaluation des performances de quelques recepteurs a maximum de vraisemblance en presence de plusieurs ondes (ou trajets), d'effet doppler et de dispersion temporelle qui peut etre importante. Sous certaines hypotheses, le canal de transmission est modelise par un canal selectif en frequence, soit de gauss, soit de rayleigh. Deux types de recepteurs associant une partie detection de symboles et une partie estimation de canal sont etudies. Le premier associe l'algorithme de viterbi (detection suivant la sequence de symboles la plus vraisemblable) a l'un ou l'autre des deux algorithmes d'estimation suivants: celui du gradient stochastique et celui des moindres carres rapide base sur l'ensemble des erreurs de prediction. Le second type de recepteur utilise un algorithme suivant le symbole le plus vraisemblable: l'algorithme em (estimation-maximisation) qui estime le canal de transmission et calcule les vraisemblances de chaque symbole. Nous avons examine, par simulations informatiques, l'influence des instants d'arrivee et des puissances des differents trajets sur les performances en terme de taux d'erreurs des recepteurs consideres. Lorsque cela s'averait possible, les resultats de simulation ont ete valides par des calculs de bornes de probabilite d'erreurs. Dans la plupart des cas etudies, les deux types de recepteurs conduisent a des performances peu differentes. En general, la selectivite du canal ameliore les performances obtenues sur canal non selectif pour le canal de rayleigh. Pour le canal gaussien, la selectivite du canal provoque une degradation des performances par rapport au cas du canal non selectif
Livros sobre o assunto "Canal de réception unique"
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Francis, Sorcha. Mom Gift : Eat Sleep Root Canal Treatment Repeat Endodontics Pretty: Root Canal Treatment, Unique Birthday Christmas Mothers Day Gift for Mom, New Mom, Wife, Women, Her - Novelty Present from Daughter, Son, Husband, Kids,Home Budget. Independently Published, 2021.
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Maurtua, Marco, Mathew Lyons e Nicholas DaPrano. Chiari Malformations. Editado por David E. Traul e Irene P. Osborn. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780190850036.003.0014.
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Chiari malformations are structural defects in the base of the skull and cerebellum. These conditions are characterized by the abnormal displacement of part of the cerebellum and brainstem through the foramen magnum into the upper spinal canal causing autonomic dysfunction, neurologic deficits, and hydrocephalus. Chiari malformations are classified into several types based on their severity and the parts of the brain affected by the herniation. In neonates, Chiari malformations are commonly associated with spina bifida and myelomeningocele. Anesthesia for surgical correction of Chiari malformations presents a unique set of challenges and demands that requires knowledge of both the neurophysiology of the condition and the surgical process.
Capítulos de livros sobre o assunto "Canal de réception unique"
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Closson, Damien, Herbert Hansen, François Halgand, Nada Milisavljevic, Frédéric Hallot e Marc Acheroy. "The Red Sea–Dead Sea Canal: Its Origin and the Challenges it Faces". In Macro-engineering Seawater in Unique Environments, 107–24. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-14779-1_5.
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Jin, Guoqiang, Zhejiang Li, Yingbiao Shi, Jiming Zhai e Runchen Ye. "The Type and Layout of the Lock Gate and the Scheduling for the Babao Lock on the Estuary with Strong Tidal Bore". In Lecture Notes in Civil Engineering, 712–23. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6138-0_62.
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AbstractThe unique tidal bore of Qiantang River is called “the first tidal bore in the world”. The outlet of Hangzhou Babao lock of Beijing-Hangzhou Canal is located in the strong tidal bore area of Qiantang River estuary. This paper focuses on the characteristics of Qiantang River tidal bore, the selection of lock gates under the action of strong tidal bore, and the navigation safety control mechanism of lock. The results show that during the spring tide period, the maximum height of the head of tidal bore at Babao lock of Qiantang River can reach 2.5 m, and the maximum tidal bore pressure on the front of the lock can reach 90–100 kPa. In order to ensure the safe operation of ship lock, the design put forward for the Qiantang river side lock head adopts the miter gates and tidal gate combination plan, namely to put a flat gate on the outside of miter gate, with gate mouth 23 m wide and height of 13 m, to withstand the enormous impact of tidal bore in a large tide by closing the tide gate before the arrival of the tide and opening the tide gate afterward, while only using the miter gate as the lock operation gate the rest of the time during which there are no tidal surges. According to the patterns of tidal bore propagation, the intelligent prediction and early warning mechanism of tidal bore, the operation rules, and the automatic control system of miter gate and tide gate are studied and established to ensure the safe and efficient operation of the lock.
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"Missionaries to Sailors and Canal Workers". In New York's Burned-over District, editado por Spencer W. McBride e Jennifer Hull Dorsey, 91–98. Cornell University Press, 2023. http://dx.doi.org/10.7591/cornell/9781501770531.003.0010.
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This chapter talks about the Buffalo-based American Bethel Society, which ministered to the sailors and canal workers who labored on American waterways. It details how the American Bethel Society published and distributed religious tracts, hymnals, and bibles. It also explains that the American Bethel Society underwrote the salaries of maritime missionaries, who ministered to watermen from “floating chapels” commonly known as Bethels. The chapter looks at the document that appeared in an 1838 issue of the Sailor's Magazine, which is a publication of the American Seaman's Friend Society. It focused on the American Bethel Society's desire to help watermen observe the Sabbath, justifying their distinctive ministry and describing the unique social and spiritual needs of sailors, canal workers, and their families.
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Smith, Paul Julian. "Race on TV: Crónica de castas [Chronicle of Castes] (Canal 11, 2014)". In Dramatized Societies: Quality Television in Spain and Mexico. Liverpool University Press, 2017. http://dx.doi.org/10.5949/liverpool/9781781383247.003.0008.
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Chapter 7 enlarges the focus on gender and sexual politics to embrace race and ethnicity. Beginning with a historical account of the complex representation of race in Mexican visual culture (painting, film, and TV), it goes on treat a unique example of a series focusing on that repressed subject. Shot and set in a working class barrio of Mexico City, this series charts the troubled consequences of ethnic mixing in Mexico, presenting little seen (and heard) indigenous characters of different kinds and enlarging its focus to embrace local Jews, Basques, and working-class transvestites. Race, gender, religion, and social class are thus cut and shuffled in this invaluable drama.
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Tabeling, Patrick, e Suelin Chen. "Hydrodynamics of microfiuidic systems". In Introduction to Microfluidics, 70–129. Oxford University PressOxford, 2005. http://dx.doi.org/10.1093/oso/9780198568643.003.0003.
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Abstract Introduction Circulating a fluid through a canal only a few micrometers wide, transporting a 10-micrometers long droplet with the aid of a liquid, and using shear to deform a bubble 100 micrometers in diameter are all situations frequently encountered in the domain of microfluidics. Many of these systems present unique problems in hydrodynamics due to the significant role of surfaces, the presence of Brownian motion, and more generally, the unusual force balances, analogous to those discussed in the previous chapter.
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Khokhlov, Vladimir Aleksandrovich, Aleksandr Vasilevich Khokhlov, Janna Olegovna Titova e Azamat Ilham Ugli Kurbonov. "Energy and Water Saving on the Pumping Stations of Karshi Main Canal". In Advances in Computer and Electrical Engineering, 289–311. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-9179-5.ch012.
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This chapter describes the advanced technologies of energy and water saving on the Uzbekistan largest pumping stations of Karshi Main Canal. The unique Karshi pumping stations stage consumes more than 4% of the total electricity generated in Uzbekistan. Such a significant consumption of electricity by irrigative pumping stations, gives the problem of energy conservation to them a status of special importance and relevance. Advanced technologies of energy saving and non-cavitation work are scientifically substantiated and developed. The results of carried out field tests are described. The scientific results of the research are recommended to allow efficient use of water and energy resources and to ensure reliable operation of the power equipment of pumping stations in the rural branches of economy.
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Ortloff, Charles R. "Environmental and Climate Perspectives on New World, Old World, and South-East Asian Societies’ Achievements in the Hydraulic Sciences". In Water Engineering in the Ancient World. Oxford University Press, 2009. http://dx.doi.org/10.1093/oso/9780199239092.003.0008.
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The foregoing chapters detail the many technical innovations in water supply, distribution, and management for several Old World, New World, and South- East Asian societies. For most of the New World’s societies, basic water resource problems evolved around securing their agricultural base given the unique environmental and water resource conditions prevalent in their locations. Diverse New World societies occupying different environment niches from dry coastal margins to wet highlands, often subject to vastly different average temperatures, crop types, and water variation cycles, were shown to devise different approaches to the development of their agricultural bases. While rainfall runoff from mountain watersheds sourced the many rivers of coastal Peruvian valleys and provided the basis for canal irrigation, excessive rainfall and cold in Andean highland locations allowed groundwater-based farming using raised Welds that had thermodynamic advantages based on conservation of the sun’s heat to prevent root crop destruction during freezing nights. The presence of varying climate cycles (excessive rainfall and drought) was seen to influence modifications in coastal canal systems. Alterations in canal size and placement to accommodate reduced-water supplies were evident in intravalley coastal systems where modifications were relatively straightforward in sandy environments. Intervalley water transfers through massive canal systems were a further characteristic of a flexible response to maintain the water resource base and this often involved the transfer of river water from one valley to another depending on agricultural, economic, and political priorities. With increased need for more agricultural lands to meet population demands, increasingly lower slope canals were surveyed to include further downslope lands. Here technical innovation was a key factor in providing surveying expertise to maintain low-slope contour canals. While such canals are found at very early Formative and Preceramic sites, surveying techniques became more refined in time to permit greater use of land areas reachable by low-slope canals. Here both Old and New World societies share their dependence on surveying technology to meet water transfer demands. While Roman surveying favoured the most direct aqueduct routing necessitating long, linear aqueduct structures interspersed with siphons and multitier aqueducts structures where appropriate, New World surveying was different in that canal designs following landscape contours were prevalent and, in some cases, optimized to produce specific and/or maximum flow rate designs. Specific measures to create hydraulic control structures to defend against El Niño destruction are evident in the New World archaeological record indicating an active, innovative engineering response to climate and weather-induced disasters, probably based on the memory of prior destructive events.
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Perera, Muditha Prasannajith, e K. W. G. Rekha Nianthi. "Land Use Planning and Management in Tank Cascade Environment of Sri Lanka". In Examining International Land Use Policies, Changes, and Conflicts, 310–29. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-4372-6.ch016.
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The Tank Cascade System is one of the unique and socially accepted land-use practices in the dry zone of Sri Lanka which has evolved since 600 B.C. The small tank builders of the historical period had a profound and unified understanding of the natural resources, regional landscape, landforms, and hydrology. Tanks and irrigation canal systems, environmental zoning, forest reservations, agro-well-based land utilization, land-sharing system (Bethma), traditional soil conservation measures have been still maintaining well in some rural areas in the dry zone. Newly developed agro-well-based agro-forestry systems and some participatory techniques are also counted as few of sustainable land-use practices. This study has provided many valuable lessons of land use planning and management from the ancient hydraulic civilization and proving that the ancient system is still appropriate for the dry zone agricultural community rather than inadequately coordinated modern efforts of land use practices.
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Ashitosh, Bahulekar, e R. P. Patange. "Comparing Bishop Score and Transvaginal Ultrasonographic Cervical Factors to Predict Labor Induction". In Advances in Artificial and Human Intelligence in the Modern Era, 286–96. IGI Global, 2023. http://dx.doi.org/10.4018/979-8-3693-1301-5.ch017.
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The excitement of being a mother and holding your child in your arms is also accompanied by increased stress levels, worry, and unpredictability of giving birth. Every labour develops individually, posing a unique set of obstacles for the mother to overcome, the partner to be amazed at, and the obstetrician to reflect on. Predicting when the labour pains will start after induction, how they will be associated with gradual cervical dilatation, and how they will end in a vaginal delivery is one of the issues that the pregnant lady, her family, and the attending obstetrician most frequently think about. Transvaginal ultrasonography is increasingly employed in obstetrics, particularly in the second and third trimesters when it is used to estimate the length of the cervical canal. Transvaginal ultrasound measurements of cervical length and the condition of the internal os of the cervix during the second trimester help define an inadequate cervix and aid in the choice to do a cervical encirclage.
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Lane, Nancy E., e Daniel J. Wallace. "The Many Faces of Osteoarthritis". In All About Osteoarthritis, 53–60. Oxford University PressNew York, NY, 2002. http://dx.doi.org/10.1093/oso/9780195138733.003.0010.
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Abstract Although most people view osteoarthritis as simply “arthritis;’ in reality there are many different types of this misunderstood disorder. As noted in chapter 1, 85-90% of osteoarthritis is known as “generalized” or “primary.” In chapters 11-13, we cover specific forms of generalized, primary osteoarthritis, which have unique or special characteristics when they appear in certain parts of the body. Examples of this adaptation to differing anatomic regions include Hebreden’s nodes in the small joints of the hand, chondromalacia patellae in the kneecap, spinal stenosis (narrowing of the spinal canal) or herniated discs in the back, and inflammatory or erosive osteoarthritis in the hand. Occasionally, classic osteoarthritis can be accelerated as a consequence of overuse syndromes and “wear and tear;’ as in a baseball pitcher’s shoulder or a basketball player’s knee. Trauma clearly brings on primary-appearing osteoarthritis to the area of injury or overuse earlier than it would appear otherwise. Broken bones during childhood often lead to osteoarthritic joints in later years.
Trabalhos de conferências sobre o assunto "Canal de réception unique"
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Borchardt, Spring, Matthew Didier e Raymond Franz. "Unique Seepage Cut-off Barriers for Lockport Canal Wall Rehabilitation Lockport, Will County, Illinois". In Proceedings of the Fourth International Conference on Grouting and Deep Mixing. Reston, VA: American Society of Civil Engineers, 2012. http://dx.doi.org/10.1061/9780784412350.0115.
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Stross, Oliver, Ian Firth, Martin Knight e Bartlomiej Halaczek. "An Unusual 3-way Footbridge – Concept and Delivery". In Footbridge 2022 (Madrid): Creating Experience. Madrid, Spain: Asociación Española de Ingeniería Estructural, 2022. http://dx.doi.org/10.24904/footbridge2022.067.
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<p>This paper describes the conception and realisation of an unusual 3-way footbridge. The unique plan form derived from the need to cross the Grand Union Canal at the point where the entrance to a new marina severed the existing tow path on one side. The marina and bridge are both part of a new mixed development on the edge of Milton Keynes in the UK. Several conceptual solutions were tested, including some with two separate bridges (one over the canal and one over the marina entrance) but the preferred design was for the 3-way bridge, creating a dramatic feature at the entrance to the marina and a focal point for the development. Construction considerations required the bridge to be installed as a single piece in a single operation, to minimise disturbance to the busy canal navigation and avoid any temporary supports. This required a large crane and dictated the use of a lightweight steel box solution. The 3-leg plan form generates some interesting load effects under asymmetric loading which will be described in the paper.</p><p>The parapets are in weathering steel and depict a pattern of reeds, like those growing on the edges of the canal in places. The laser-cut pattern carefully controls the maximum size of the openings and avoids sharp edges in the panels which are entirely fabricated from the digital file prepared by the designers which avoids repetition of the pattern anywhere along the bridge.</p>
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Thie, Edwin, e Oriol Casas Cancer. "Footbridge - Cirkelbrug". In Footbridge 2022 (Madrid): Creating Experience. Madrid, Spain: Asociación Española de Ingeniería Estructural, 2022. http://dx.doi.org/10.24904/footbridge2022.101.
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<p>The new footbridge near Almere in the Netherlands will facilitate a safe crossing over the Waterlandseweg and improve the recreational network in the area. The slender 240m long steel bridge generates two unique balconies on top of the bridge. The balconies and the shape of the bridge invites the user to enjoy the different views of the surroundings. The paper will further elaborate on the architectural design and user experience. The meandering shape leads to a constantly changing cross section, which was interesting translating to a rational structural design, and for assessing the risk of uncomfortable vibrations and need of dampers for control. Especially the seating area on the bridge over the canal was identified as an area of concern. The paper shows the approach taken and the results of steady state dynamic analyses, transient dynamic analyses and measurements of the final product. Transient dynamic analyses results are more accurate and less conservative than the steady-state analyses, but some deviation from the measured accelerations remained. This project shows it is advised to account for dampers at the design stage when analyses show dynamic sensitivity of the bridge. And actual testing is necessary for taking the final decisions on the need for dampers.</p>
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Tsamourtzis, V., e A. Bölcs. "Quasi-Three-Dimensional Simplified Method for a Transonic Compressor Rotor". In ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-gt-040.
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A quasi three-dimensional method has been developed to calculate the transonic flow in a compressor rotor. The method allows changes in the stream tube thickness and mean radius evolution through the rotor. This blade-to-blade method uses original concepts in order to be rapid (≈ 3–4 sec CPU on a HP 715 workstation), to find the precise location of the shocks (and thus the flow values on them) and the flow distribution around the profile, and finally to cover a large field of “Off-Design” operating points. Thus, it can be used in the process of optimization of a transonic compressor. The supersonic flow at the inlet as well as the oblique shock configuration inside the cascade are calculated by methods based on the characteristics theory. Conditions with attached shock wave (and thus unique incidence angle) or with detached shock wave can be calculated. Quasi-3D equations were developed (Bölcs and Tsamourtzis, 1991). The subsonic flow is calculated by a streamline curvature method, with some new concepts, and finally the shock in the inter-blade canal is found by a combination of the supersonic and subsonic flow values. This method was combined, in a S1 - S2 calculation, with a throughflow method (Sayari and Bölcs, 1995) in order to be validated by comparing the results with the measurements provided by NASA - Lewis Research Center, on a transonic compressor rotor (Strazisar T.; 1994).
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Zunno, Antonio. "La fortezza e il suo giardino: uno sguardo dal mare". In FORTMED2020 - Defensive Architecture of the Mediterranean. Valencia: Universitat Politàcnica de València, 2020. http://dx.doi.org/10.4995/fortmed2020.2020.11368.
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The fortress and its garden: a view from the seaThe Fortress was built from 1554, on the ruins of an ancient convent, at the behest of Philip of Austria, and it was completed in about 55 years under the direction of Giulio Cesare Falco, knight of the Order of Malta and Captain General against the Turks. The maine structure, called Forte a Mare, was joined with the Opera a Corno, a mighty rampart with the function of enclosure of the intermediate island, separated from the other island in 1598 by the construction of the Angevin canal: here were arranged the lodgings of the troops and garrisons. Castello and Forte, were named by the Spaniards Isla Fortalera que abre el Puerto Grande, because of its particular position to protect the port. The complex was entrusted to the Germans in 1715, then conquered by the French Revolutionaries and, in 1815, re-annexed to the Kingdom of Naples and destined to lazaretto. A period of decline follows until the end of the 19th century when Brindisi became a first class naval base and the fort became a garrison of the Royal Navy, destined, during the Great War, to recover torpedoes and detonators The recovery of the complex, starting in the 1980s, allowed the conservation of the structures but was never included in a real valorisation program. With this intervention in progress, a first visit is expected through the visit from the walkways through a circular route from the Castle to the whole Opera in Corno: the itinerary will allow you to retrace the history of the Fortress and enjoy a unique view from the high towards the sea, also through the passage in a curtain of Mediterranean scrub that has colonized the walls over the centuries, creating a veritable hanging garden on the sea. The aim is to lead the visitor to the rediscovery a forgotten place that is closely connected to the coastal landscape, for which it is a privileged point of view also in relation to the city and the port.
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"Automatic Detection and Classification of Dental Restorations in Panoramic Radiographs". In InSITE 2019: Informing Science + IT Education Conferences: Jerusalem. Informing Science Institute, 2019. http://dx.doi.org/10.28945/4307.
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[This Proceedings paper was revised and published in the 2019 issue of the journal Issues in Informing Science and Information Technology, Volume 16] Aim/Purpose: The aim of this study was to develop a prototype of an information-generating computer tool designed to automatically map the dental restorations in a panoramic radiograph. Background: A panoramic radiograph is an external dental radiograph of the oro-maxillofacial region, obtained with minimal discomfort and significantly lower radiation dose compared to full mouth intra-oral radiographs or cone-beam computed tomography (CBCT) imaging. Currently, however, a radiologic informative report is not regularly designed for a panoramic radiograph, and the referring doctor needs to interpret the panoramic radiograph manually, according to his own judgment. Methodology: An algorithm, based on techniques of computer vision and machine learning, was developed to automatically detect and classify dental restorations in a panoramic radiograph, such as fillings, crowns, root canal treatments and implants. An experienced dentist evaluated 63 panoramic anonymized images and marked on them, manually, 316 various restorations. The images were automatically cropped to obtain a region of interest (ROI) containing only the upper and lower alveolar ridges. The algorithm automatically segmented the restorations using a local adaptive threshold. In order to improve detection of the dental restorations, morphological operations such as opening, closing and hole-filling were employed. Since each restoration is characterized by a unique shape and unique gray level distribution, 20 numerical features describing the contour and the texture were extracted in order to classify the restorations. Twenty-two different machine learning models were evaluated, using a cross-validation approach, to automatically classify the dental restorations into 9 categories. Contribution: The computer tool will provide automatic detection and classification of dental restorations, as an initial step toward automatic detection of oral pathologies in a panoramic radiograph. The use of this algorithm will aid in generating a radiologic report which includes all the information required to improve patient management and treatment outcome. Findings: The automatic cropping of the ROI in the panoramic radiographs, in order to include only the alveolar ridges, was successful in 97% of the cases. The developed algorithm for detection and classification of the dental restorations correctly detected 95% of the restorations. ‘Weighted k-NN’ was the machine-learning model that yielded the best classification rate of the dental restorations - 92%. Impact on Society: Information that will be extracted automatically from the panoramic image will provide a reliable, reproducible radiographic report, currently unavailable, which will assist the clinician as well as improve patients’ reliance on the diagnosis. Future Research: The algorithm for automatic detection and classification of dental restorations in panoramic imaging must be trained on a larger dataset to improve the results. This algorithm will then be used as a preliminary stage for automatically detecting incidental oral pathologies exhibited in the panoramic images.
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Anandapadmanaban, B., A. Babu, B. Babu, K. Dinesh, V. Ramanathan e G. Srinivasan. "Life Extension of the Fast Breeder Test Reactor". In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29277.
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The Fast Breeder Test Reactor (FBTR) is a loop type sodium cooled fast reactor located at Kalpakkam, India. The reactor went critical in October, 1985 with a core of 23 unique high Plutonium carbide fuel subassemblies and the reactor power was rated for 10.5MWt with peak linear heat rating of fuel at 320W/cm. The extension of the target burn-up of this fuel based on Post Irradiation Examination at different stages enabled progressive expansion of the core and increase in reactor power. The reactor has been operated upto a power level of 18.6MWt/3MWe with a sodium temperature of 482°C max. The reactor has completed 24 years of operation and is currently under periodic safety review by the Atomic Energy Regulatory Board of India. As a part of the periodic safety review, equipment qualification status and ageing management studies have been presented to the regulators. Equipment qualification refers to the ability of the replaceable equipment to meet the functional requirements on demand, accomplished by periodic surveillance, maintenance and replacement. Ageing management addresses the residual life assessment of components which are passive, non-replaceable / replaceable with difficulty, taking into account their life degrading mechanisms. Over a period of time, based on the operational feedback, maintenance difficulties and obsolescence, several major components have been replaced. These include the Neutronic channels, UPS, computers of the Central Data Processing System, main boiler feed pumps, three control rod drive mechanisms, two control rods, central canal plug, deaerator lift pumps, reheaters of the steam water system, station batteries, DM plant and Nitrogen plant. The starting air system of the emergency diesel generators and isolation dampers of the reactor containment building have also been replaced. Regarding the non-replaceable components, residual life assessment has been carried out based on the operational history vis-a`-vis the design limits for each component. The life limiting mechanism of heat transport systems of FBTR are creep and fatigue. Since the reactor has operated only upto a temperature of 444°C till 2007, the creep effect is insignificant. The total number of thermal cycles seen by the reactor components as of 2007 was 163, as against the design cycle of 2000 for most of the components. Hence all the heat transport system components are as good as fresh ones. However, the major life limiting factor has been found to be the Neutronic fluence on the grid plate which supports the core. The fast flux at the grid plate location was measured using Np foils and the residual life of the reactor has been assessed to be 10.5 effective full power years. This paper details the life extension exercise being carried out for FBTR.
Relatórios de organizações sobre o assunto "Canal de réception unique"
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Li, Z., e R. Kung. Report on Cruise 2023004PGC (CCGS Vector): B.C. coastal hydrographic and geoscientific surveys - operations off Haida Gwaii and Vancouver Island. Natural Resources Canada/CMSS/Information Management, 2024. http://dx.doi.org/10.4095/332552.
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A survey cruise was collaboratively conducted by the Canadian Hydrographic Service and the Geological Survey of Canada aboard the CCGS Vector in the summer of 2023. The aim was to collect multibeam data, sub-bottom profile data, and grab samples for mapping bathymetry and surficial geology-one of the objectives of Marine Geoscience for Marine Spatial Planning Program. This expedition totally covered approximately 1770 km² of multibeam survey, navigated 10,576 km of sub-bottom profile lines, and collected 40 grab samples. The survey regions included Swiftsure Bank, Amphitrite Bank, Cartwright Sound, Hippa Island, Rennell Sound, Portland Canal, Portland Inlet, Bute Inlet, the Strait of Georgia, and Juan de Fuca Strait. Each area exhibited unique features, with various seafloor morphologic units such as gravel platforms, landslides, deep channels, fan deltas, moraines, and bedforms.