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Auswahl der wissenschaftlichen Literatur zum Thema „Double canal“
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Zeitschriftenartikel zum Thema "Double canal"
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Banik, Shoma, Samir Banik, Mushfiq Hassan Shaikh, Parimol Chandra Mallick, Abdul Gofur und Manjur E-Mahmud. „Bilateral double mandibular canal - a case report“. Update Dental College Journal 2, Nr. 1 (25.02.2013): 31–34. http://dx.doi.org/10.3329/updcj.v2i1.13958.
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Objectives: The objective is to draw attention to the anatomical variation of mandibular canal (double mandibular canals). Methods: This case report showing clinical and radiographic findings of a patient who was presented with bilateral double mandibular canals were recorded. Results: Bifid or double mandibular canals can be detected on a panoramic radiograph. More precise information about the course of the canal can be revealed on CBCT scan. Conclusions: The detection of these bifid or double mandibular canals are important because of their clinical implications. Special attention has to be made in the surgical procedures, especially involving the lower jaw.DOI: http://dx.doi.org/10.3329/updcj.v2i1.13958 Update Dent. Coll. j: 2012; 2 (1): 31-34
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Öztürk, Ayla, Ayşe Tayman und Anitha Potluri. „Observation of Double Mandibular Canals and Types of Bifid Canals in Dry Skulls“. Balkan Journal of Dental Medicine 24, Nr. 2 (01.07.2020): 107–12. http://dx.doi.org/10.2478/bjdm-2020-0018.
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SummaryBackground/Aim: The aim of the present study was to assess prevalence and morphologic mandibular canal variations in dry skulls.Material and Methods: Panoramic radiographs were obtained of 57 skulls among the academic collection at the University of Pittsburgh. Orthodontic wire was inserted through the mandibular canal as a reference point at panoramic images for localization of the course of the mandibular canal.Results: Double mandibular canals were present in 2 out of 57 skulls (3,5%); one of them was unilateral the other one was bilateral. Additionally, bifurcation of the mandibular canal and different types of configurations were assessed. In five of the specimens (8,8%) bifid canals were identified. Among them, one case (1,7%) was identified as a forward type. In one case additional canal (1,7%), was detected in the retromolar region, which joined the main canal. Three of the specimens (5,3%) showed accessory canal types. These were the canals that detached from the main canal and proceeded towards the molar teeth roots (dental type). All of these bifid canal types were unilateral.Conclusions: Our results depicted the anatomical variations of the mandibular canal. Dental practitioners should be aware of this underestimated but not a rare occurrence of mandibular canal variations in order to avoid complication during surgical procedures.
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Manfron, Ana Paula Tulio, Alessandra Soares Ditzel, Flávia Gasparini Kiatake Fontão und Luciana Rei Azevedo-Alanis. „Double Retromolar Canal: a Case Report“. Journal of Health Sciences 21, Nr. 5 (20.12.2019): 474–76. http://dx.doi.org/10.17921/2447-8938.2019v21n5p474-476.
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AbstractThe retromolar canal is an anatomical variation of the mandibular canal. Its neurovascular bundle may extend to areas of the temporalis tendon, and areas of buccinator muscle insertion in the alveolar process at lower third molar region, beside the retromolar fossa. The observation of the retromolar canal in conventional radiographs is limited by the presence of increased bone condensation in the region due to overlapping anatomical structures. The use of three-dimensional imaging techniques, such as cone beam computed tomography can contribute significantly for the treatment planning.Some complications may occur in surgical procedures involving the retromolar area when the retromolar canals are present, such as hemorrhage, failure in anesthesia and injuries to nerve branches. This study reported an unusual case of a double retromolar canal on the left side of the mandible, that led to the change of the treatment planning in a 54-year-old male patient. Furthermore, the clinical and surgical consequences of these findings in oral rehabilitation were discussed. The cone beam computed tomography was an important diagnostic tool in the observation of the presence and the exact location of retromolar canal. Retromolar canals may be detected on a panoramic radiograph. However, more precise information about the anatomical variation can be shown on cross sectional cone beam computed tomography images. Keywords: Anatomic Variation. Mandible. Cone-Beam Computed Tomography. ResumoO canal retromolar é uma variação anatômica do canal da mandíbula. Seu feixe vásculo-nervoso pode se estender para áreas do tendão do músculo temporal, áreas de inserção do músculo bucinador e no processo alveolar na região do terceiro molar inferior, além da fossa retromolar. A observação do canal retromolar em radiografias convencionais é limitada pela presença de condensação óssea com sobreposição de estruturas anatômicas. Devido a esse fato o uso de técnicas de imagem tridimensionais, como a tomografia computadorizada de feixe cônico, contribuem significativamente para o planejamento do tratamento. Algumas complicações podem ocorrer em procedimentos cirúrgicos envolvendo a região retromolar quando o canal retromolar está presente, como hemorragia, falha na anestesia e lesões aos ramos nervosos. Este estudo relatou um caso incomum de canal retromolar duplo, do lado esquerdo da mandíbula, causando alterações no planejamento clínico do tratamento de um paciente do sexo masculino de 54 anos de idade. Além disso, as consequências clínicas e cirúrgicas desses achados na reabilitação bucal foram discutidas. Atomografia computadorizada de feixe cônico apresentou-se como importante ferramenta diagnóstica na observação da presença e localização exata do canal retromolar. Canais retromolares podem ser detectados em uma radiografia panorâmica. No entanto, informações mais precisas sobre esta variação anatômica podem ser mostradas em imagens de tomografia computadorizada de feixe cônico. Palavras-chave: Variação Anatômica. Mandíbula. Tomografia Computadorizada de Feixe Cônico.AbstractThe retromolar canal is an anatomical variation of the mandibular canal. Its neurovascular bundle may extend to areas of the temporalis tendon, and areas of buccinator muscle insertion in the alveolar process at lower third molar region, beside the retromolar fossa. The observation of the retromolar canal in conventional radiographs is limited by the presence of increased bone condensation in the region due to overlapping anatomical structures. The use of three-dimensional imaging techniques, such as cone beam computed tomography can contribute significantly for the treatment planning.Some complications may occur in surgical procedures involving the retromolar area when the retromolar canals are present, such as hemorrhage, failure in anesthesia and injuries to nerve branches. This study reported an unusual case of a double retromolar canal on the left side of the mandible, that led to the change of the treatment planning in a 54-year-old male patient. Furthermore, the clinical and surgical consequences of these findings in oral rehabilitation were discussed. The cone beam computed tomography was an important diagnostic tool in the observation of the presence and the exact location of retromolar canal. Retromolar canals may be detected on a panoramic radiograph. However, more precise information about the anatomical variation can be shown on cross sectional cone beam computed tomography images. Keywords: Anatomic Variation. Mandible. Cone-Beam Computed Tomography. ResumoO canal retromolar é uma variação anatômica do canal da mandíbula. Seu feixe vásculo-nervoso pode se estender para áreas do tendão do músculo temporal, áreas de inserção do músculo bucinador e no processo alveolar na região do terceiro molar inferior, além da fossa retromolar. A observação do canal retromolar em radiografias convencionais é limitada pela presença de condensação óssea com sobreposição de estruturas anatômicas. Devido a esse fato o uso de técnicas de imagem tridimensionais, como a tomografia computadorizada de feixe cônico, contribuem significativamente para o planejamento do tratamento. Algumas complicações podem ocorrer em procedimentos cirúrgicos envolvendo a região retromolar quando o canal retromolar está presente, como hemorragia, falha na anestesia e lesões aos ramos nervosos. Este estudo relatou um caso incomum de canal retromolar duplo, do lado esquerdo da mandíbula, causando alterações no planejamento clínico do tratamento de um paciente do sexo masculino de 54 anos de idade. Além disso, as consequências clínicas e cirúrgicas desses achados na reabilitação bucal foram discutidas. Atomografia computadorizada de feixe cônico apresentou-se como importante ferramenta diagnóstica na observação da presença e localização exata do canal retromolar. Canais retromolares podem ser detectados em uma radiografia panorâmica. No entanto, informações mais precisas sobre esta variação anatômica podem ser mostradas em imagens de tomografia computadorizada de feixe cônico. Palavras-chave: Variação Anatômica. Mandíbula. Tomografia Computadorizada de Feixe Cônico.
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Jamleh, Ahmed, Hajar Albanyan, Ali Alaqla, Hamad Alissa, Nawaf Alshetan, Sulaiman Alraffa und Abdulmohsen Alfadley. „Impact of cooling on shaping ability of thermally treated files in canal models with double curvature“. PeerJ 11 (08.08.2023): e15830. http://dx.doi.org/10.7717/peerj.15830.
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Background This study compared the ability of thermally treated files in shaping simulated canals with double curvature. Fifty-six canals were enlarged to a final size of 25 with ProTaper Next (PTN) or ZenFlex (ZF). Materials Half of the samples were shaped with cooled files (n = 14 each). The amount of removed resin was measured and canal deviation was determined at eight levels. Shaping time and maximum shaping torque values were also recorded. Data were statistically analyzed using analysis of variance and LSD, Kruskal–Wallis, and chi-square tests at a 0.05 significance level. Results Compared to PTN and cooled PTN, ZF and cooled ZF required lesser time to shape the canals. The maximum torques were found comparable between the groups. All the groups generated negligible deviations at every canal level evaluated and maintained the canal geometry. Although not significant, the cooled PTN and ZF files exhibited lesser canal deviations than their counterparts. Conclusion All groups demonstrated similar shaping ability whilst maintaining the original curvature of the canal in simulated canals with double curvature. However, ZF groups were able to shape the canals faster than PTN groups. There was a trend that cooled files made lesser canal deviations compared to their counterparts.
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Shrestha, Sandhya, Anu Karmacharya, Ankit Saha und Meenu Shrestha. „An Observational Study on Root Canal Morphology of Mandibular Incisors in a Dental College Hospital“. Journal of Universal College of Medical Sciences 10, Nr. 01 (09.08.2022): 53–57. http://dx.doi.org/10.3126/jucms.v10i01.47241.
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INTRODUCTIONAdditional canals are frequent findings in radicular morphology of the mandibular incisors. Finding additional canals and their obturation significantly improve the prognosis of endodontic treatment. Cone Beam Computed Tomography (CBCT) best visualize all canals and their configurations. The study assessed root canal anatomy of mandibular incisors on CBCT images of the patients. MATERIAL AND METHODSAn observational cross-sectional study was carried during July-October 2021 on 42 CBCT images of the patients visiting Kantipur Dental College and Hospital. The samples were selected using convenience sampling presenting with bilateral mandibular central and lateral incisors. Root canals and their configurations were assessed on 168 teeth. The presence of unilateral or bilateral additional root canal was recorded and chi-square test was used to test its association with gender (p < 0.05). RESULTThe prevalence of additional canal was 27.4% in mandibular incisors. Bilateral symmetrical distribution of extra canal in mandibular central and lateral incisors were 36.3% and 41.6% respectively. There was a significant association between the presence of extra canal and gender in both central incisors (p-value 0.019) and lateral incisors (p-value 0.009). Type I canal configuration was most prevalent (72.6%) followed by Type III (22.6%). CONCLUSIONThe prevalence of double canals in mandibular incisors is 35% in male and 4% in female samples confirming the male predominance. Bilaterally symmetrical occurrence of double canal is evident up to 41%. CBCT evaluation helps in the visualization of missing root canals during endodontic therapy.
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Almohaimede, Amal A., Alanoud A. Alqahtani, Norah M. Alhatlani, Nouf S. Alsaloom und Shafia A. Alqahtani. „Interpretation of Root Canal Anatomy of Maxillary and Mandibular Permanent Canines in Saudi Subpopulation: A Cone-Beam Computed Tomography (CBCT) Study“. International Journal of Dentistry 2021 (12.02.2021): 1–7. http://dx.doi.org/10.1155/2021/5574512.
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The objective of this investigation was to evaluate the root canal anatomy of permanent canines in a Saudi subpopulation utilizing CBCT. A total of 1328 CBCT images of maxillary (634) and mandibular (694) permanent canines were collected from Saudi patients who visited the College of Dentistry at King Saud University in Riyadh. The images were analyzed for root and canal numbers, canal configuration types, and symmetry between the bilateral canine teeth in each arch. Gender, age, and tooth position were recorded. The Kappa test was used for both inter- and intraexaminer reliabilities. Data were analyzed with the chi-square test at a P value ≤ 0.05 . There were no two-rooted teeth in maxillary canines, and 1.89% had two canals. Double roots and double canals in mandibular canines were found in 2.88% and 9.94% of the teeth, respectively. Type I canal configuration was more common in maxillary canines (97.94%) compared to mandibular canines (92.07%). Maxillary canines showed higher bilateral symmetries of root and canal numbers and canal configuration types (100%, 98.1%, and 97.9%, resp.) compared to mandibular canines (97.1%, 90.1%, and 92.1%, respectively). The majority of maxillary and mandibular canines had a single root with a single canal and type I canal configuration. Mandibular canines are characterized by having more than one root and canal and alterations in root canal configurations compared to maxillary canines.
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Sana, U., I. U. Niazi, R. S. Din, M. Rasheed, I. Haider und O. Yousaf. „Root. Canal. Morphology. of Mandibular. First. Permanent. Molars. in a Pakistani. Sub-population“. Pakistan Journal of Medical and Health Sciences 15, Nr. 6 (30.06.2021): 1314–16. http://dx.doi.org/10.53350/pjmhs211561314.
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Aim : To investigate the number and. patterns of. root canals. of mandibular. first. molars.. Methods.: Descriptive observational study to investigate the canal morphology using clearing technique. The duration of the study was one year from 1st February 2020 to 1st February 2021.Non purposive sampling technique was used and 200 mandibular first molar were collected. Data collected was analysed using the SPSS Vr 10. Study variables include Number and pattern of the roots in mandibular teeth. Descriptive statistics were used; frequencies of the root canals and their canal pattern were calculated. Results: In the mesial root, 14 teeth had a one root canal,186 possessed double root canals were observed. Distal root of 160 teeth possessed one canal, 40 teeth possessed two root canals with type 1 pattern mostly observed. Conclusion: Like other populations Pakistani population may have a diverse root canal system in the mandibular molars that ultimately affect endodontic therapy. Keywords: Roots, canals, anatomy, tooth clearing technique, demineralization
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Kacarska, Marina, und Julija Zivadinovic. „Root anatomy and apical canal morphology of maxillary first premolars“. Macedonian Pharmaceutical Bulletin 64, Nr. 01 (2018): 89–94. http://dx.doi.org/10.33320/maced.pharm.bull.2018.64.01.008.
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Understanding the root anatomy and apical canal morphology of maxillary premolars is a key prerequisite for successful surgical and endodontic treatment. The aim of this study was to assess the root anatomy and apical canal morphology of maxillary first premolars. To achieve the set task, 30 maxillary first premolars were extracted. After thorough rinse visual assessment of root anatomy was made. Each root was transversally sectioned six millimeters from apex with a straight hand piece. The apical samples were decalcificated in 7.5% trichloroacetic acid, transversal sections were made, stored in 10% formalin then dyed in hematoxylin and eosin and numerated from I to VI. Apical canal morphology was evaluated with an optical microscope. Majority of maxillary first premolars had double roots (63.0%; n=19) that were mostly separated (50.0%; n=15) containing a single root canal. Minority had double roots that were fused (13.0%; n=4) with two root canals. Single root with almost equal occurrence of two, as well as variable root canal configuration were found in (30.0%; n=9). A very rare occurrence of maxillary first premolars with three roots (7.0%; n=2) was detected, two vestibular and one palatal, each containing a single canal configuration. Accessory lateral canals were detected in 20% of maxillary first premolars. Transversal communications were detected in maxillary premolars with one root and double fused roots (26.6%; n=8). A single apical foramen was detected in majority of maxillary first premolars (50.0%; n=15). Two apical foramina were detected in (33.4%; n=10), three in (10.0%; n=3) and four in (6.6%; n=2) maxillary premolars. Keywords: maxillary first premolar, root anatomy, apical canal morphology, decalcification, optical microscopy
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Mukhaimer, Raed Hakam. „Evaluation of Root Canal Configuration of Mandibular First Molars in a Palestinian Population by Using Cone-Beam Computed Tomography: An Ex Vivo Study“. International Scholarly Research Notices 2014 (13.08.2014): 1–7. http://dx.doi.org/10.1155/2014/583621.
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Aim. The purpose of this study was to investigate the number of canals and variations in root canal configuration in the mandibular permanent first molar teeth of a Palestinian population using cone-beam computed tomography (CBCT). Methods. A sample of 320 extracted double-rooted mandibular permanent first molars from Palestinian population was collected for this study and scanned with CBCT scanner. The following observations were made: number of root canals per root and canal configuration in each root based on Vertucci’s classification. Results. Of the 320 mandibular first molars analyzed, 174 (54.4%) had three canals, 132 teeth (41.3%) had four canals, and only four teeth had two canals. The most common canal configuration in the mesial roots was Vertucci type IV (53.8%) followed by type II (38.8%). In the distal roots, the most prevalent canal configuration was Vertucci type I (57.5%) followed by type II ( 22.5%) and type III (10.6%). Conclusion. Our results showed that the number of canals and canal configuration in Palestinian population were consistent with previously reported data. The present study also indicates that CBCT is helpful as a diagnostic tool for the investigation of root canal morphology.
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Fatima, Nafees, Shamir Rahman, Md Jawed Akhtar und Vinod Kumar. „Duplication of hypoglossal canal in North Indian human skulls“. International Journal of Research in Medical Sciences 5, Nr. 6 (27.05.2017): 2301. http://dx.doi.org/10.18203/2320-6012.ijrms20172423.
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Background: The hypoglossal canal is one among the permanent components of occipital bone of both human being and animal skull, which transmits the twelfth cranial nerve, meningeal branch of ascending pharyngeal artery and emissary veins. This is commonly known as anterior condylar canal. In some cases, this canal is divided by a bony spicule leading to a variant known as double hypoglossal canal. Such partition of hypoglossal canal predisposes the roots of twelfth cranial nerve to entrapment in the occipital bone during ossification which subsequently may leads to an alteration in the tongue movement as well as speech. The objectives of the present study were to obtain the incidence of the variant of double hypoglossal canal in north Indian population especially in Bihar and compare the incidence of such type of variation in skull of different parts of our country as well as various races of the world.Methods: The present study was carried out on 110 undamaged dry adult human crania of unknown age and sex for any variations in the hypoglossal canal or incidence of double hypoglossal canal.Results: We observed 15 cases (13.63%) of double hypoglossal canal in which 8 (7.27%) specimens had unilateral while 7 (6.36%) specimens had bilateral double hypoglossal canal. Double hypoglossal canal was more common in right side. In 5 cases (4.54%) unilateral bony spicules were seen.Conclusions: The study about the hypoglossal canal and its different variation is very important to clinicians, anatomist, forensic experts as well as anthropologists too. The knowledge about the different dimensions of hypoglossal canal is also very essential for neurosurgeons and radiologist for the planning of the surgeries around the posterior cranial fossa for tumors like schwannoma of hypoglossal nerve and treatment of sleep apnea syndrome. Hence the detailed morphometric study of hypoglossal canal will be helpful for the planning of surgical intervention around the base of skull becomes easier and safer.
Dissertationen zum Thema "Double canal"
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Tuerke, Florian. „Interaction entre deux cavités opposées dans un canal hydrodynamique“. Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS078/document.
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Dans ce travail, nous étudions l'écoulement au sein d'un canal symétrique avec une expansion et une contraction soudaines. Cette configuration peut être considérée comme constituée de deux cavités face à face, deux cavités en miroir, que nous dénommons "double cavité". Le sujet est traité expérimentalement, numériquement et analytiquement, en faisant varier la vitesse d'entrée et de la distance entre cavités, mais en restant à des nombres de Reynolds modérés. L'accent est mis sur l'interaction entre les deux couches de cisaillement et sur le mécanisme de rétroaction intracavitaire dans la limite des écoulements incompressibles. Expérimentalement, on mesure la vitesse par Vélocimétrie par Images de Particules non résolue en temps (PIV 2D2C) dans un plan longitudinal permettent de quanti er le champ de vitesse en moyenne temporelle. Par ailleurs, des mesures par Vélocimétrie Laser à effet Doppler (LDV) et des mesures résolues en temps par PIV 2D2C permettent d'accéder à la composition spectrale des fluctuations de vitesse dans la direction de l'écoulement. L'écoulement est caractérisé à partir des séries temporelles, enregistrées dans les couches de cisaillement d'une des deux cavités, pour une large gamme de vitesses d'entrée et des distances entre cavités. Des simulations numériques directes 2D et 3D, permettent d'étudier le mécanisme hydrodynamique de rétroaction intracavitaire, à partir des champs de vitesse complet. Le champ de vorticité issu des simulations numériques 2D montre l'importance de la rotation d'ensemble au sein de la cavité qui transporte les injections de vorticité induites par les oscillations de la couche de mélange conduisant à une structure de type "carrousel" elle-même à l'origine du mécanisme de rétroaction responsable des oscillations auto-entretenues de la couche de cisaillement. La quanti cation des temps caractéristiques de cette rotation permet d'identifier le régime dans lequel se trouve l'écoulement. Une analyse de stabilité en temps seul, ainsi qu'en temps et espace est réalisée pour des écoulements non visqueux, en prenant un écoulement de base unidimensionnel pour chacun des cas: cavité simple ou double. Pour prendre en compte l'extension finie du système, dans le cas de l'analyse de stabilité linéaire spatio-temporel, on ajoute la condition dite de Kulikowskii, qui permet de prendre en compte la réflexion des ondes d'instabilité hydrodynamique aux bornes du domaine de la cavité. Ce mécanisme de rétroaction produit un ensemble discret de fréquences non-harmoniques, dont certaines correspondent effectivement aux données expérimentalesThis work investigates the flow in a symmetric channel with a sudden expansion and contraction, creating two facing cavities, a so called double cavity. Double cavity flow at moderate Reynolds numbers is studied experimentally, numerically and analytically, as the inflow velocity and the distance between the cavities are varied. The focus is put on the interaction of the two shear layers and the intracavitary hydrodynamic feedback in the incompressible limit.Experimentally, standard 2D2C particle image velocimetry (PIV) measurements in a given spanwise plane provide information on the instantaneous and mean velocity flow fields. Laser Doppler velocimetry and time resolved 2D2C PIV measurements reveal the richness of the streamwise fluctuating velocity spectra. The flow is characterized based on times series, recorded in one of the cavity's shear layers, for a wide range of inflow velocities and cavity distances.Two dimensional and three dimensional direct numerical simulations, which give easy access to the entire flow field, are used to study the intracavitary hydrodynamic feedback mechanism. Vorticity fields, obtained from 2D numerical simulations, show the importance of the recirculating intracavitary back flow. Vorticity packages, injected by the oscillating and impinging shear layer at the downstream cavity edge, are advected upstream in the recirculation region, creating a ``carousel-like'' pattern. The interaction of this vortex carousel with the oscillating shear layer is found to be responsible for the self-sustained oscillations observed experimentally in single and double cavity flow. The quantification of three characteristic time scales of the rotation allows to identify in which regime the flow resides.Temporal and spatio-temporal inviscid linear stability analyses are applied to a one dimensional base flow of single and double cavity flows. To account for the finite extent of the system, the spatio-temporal linear stability analysis is conditioned by a so called Kulikowskii condition, which allows the reflection of hydrodynamic instability waves within the cavity domain. This feedback mechanism yields a set of discrete, non-harmonic frequencies, some of which compare well with experimental results
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Retournard, Alain. „Étude et réalisation d'un canal de double résonance adapté aux expériences de RMN multi-impulsionnelles“. Nancy 1, 1989. http://www.theses.fr/1989NAN10478.
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Dispositif de double résonance, couvrant la même gamme de fréquence que le canal d'émission principal et présentant la même souplesse d'utilisation quant au contrôle des amplitude, fréquence et phase. Ce dispositif, normalement placé sous contrôle du calculateur, intègre intégralement des séquences d'impulsions préprogrammées, réalisées dans le mode hardware, qui seraient difficilement générées directement par le calculateur. L'ensemble a été conçu de manière à pouvoir être utilisé de façon très souple et de permettre par conséquent la mise en œuvre de toute nouvelle séquence d'impulsions, si compliquée soit-elle
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Li, Yiqin. „Approches analytique et expérimentale de la convection naturelle en canal vertical : Application aux double-façades photovoltaïques“. Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI002/document.
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Dans le contexte énergétique actuel, le développement de l'énergie solaire passe par son développement à grande échelle en milieu urbain. Les solutions actives et intégrées telles que les double-façades photovoltaïques permettent d'une part d'envisager une valorisation de la chaleur et d'autre part de valoriser l'enveloppe des bâtiments en tant que surface de captation. De plus, cette configuration limite la perte de rendement et l'accélération du vieillissement liées à la surchauffe des cellules. En effet, les composants photovoltaïques sont séparés du bâtiment par une lame d'air et la convection naturelle développée dans cet espace favorise l'évacuation de la chaleur absorbée par les panneaux. Cependant, le comportement global d'une double-façade photovoltaïque est très complexe et encore mal compris. Cette thèse se focalise sur l'expérimentation du phénomène de la convection naturelle. Un banc d'essais, développé dans le cadre de la thèse de Daverat, modélise la double-façade par un canal vertical avec chauffage pariétal. Le fluide d'étude est de l'eau afin de s'affranchir du rayonnement entre parois et d'étudier le couplage conduction-convection. Le banc d'essais est constitué d'un canal vertical de 65cm de haut, chauffé à une densité de flux uniforme, plongé dans une cellule de 1,5m de haut remplie d'eau. L'écoulement est observé par des mesures de densité de flux de chaleur, de température pariétale et de vitesse, ces dernières étant réalisées par vélocimétrie par images de particules et par vélocimétrie laser Doppler. Deux configurations de chauffage sont étudiées : symétrique et asymétrique. Pour l'étude de la configuration avec un chauffage symétrique, les données expérimentales issues du travail de thèse de Daverat sont analysées par une approche zonale. Un découpage du canal est proposé et une analyse des ordres de grandeur permet de comprendre les observations expérimentales. Ainsi, cette analyse se focalise sur le transfert thermique aux parois, l'évolution de la pression dans le canal et sur les fluctuations, en particulier, sur l'évaluation du terme croisé du tenseur de Reynolds. La configuration d'un chauffage asymétrique est étudiée expérimentalement pour la phase de démarrage et le régime stationnaire. Pour la phase de démarrage, la caractérisation des premières heures à partir de la mise en chauffage de la paroi est réalisée en termes de température pariétale, de vitesse et de comportement bi-/tri-dimensionnel de l'écoulement. Un écoulement de retour de grande échelle est mis en évidence. L'impact de la stratification thermique externe du canal est également étudié. Pour le régime stationnaire, les analyses sont réalisées sur des données pour lesquels le régime est considéré établi. Les comportements thermique et dynamique sont étudiés et mettent en évidence deux états distincts. Des écoulements de retour sont également observés. Enfin, les influences du nombre de Prandtl et de l'écartement du canal sont discutéesUnder the current energy context, the development of solar energy goes through its large scale development, especially in urban areas. Active and integrated solutions, such as photovoltaic double-skins, allow both the heat recovery for building needs and the exploitation of building envelope as collecting surface. Furthermore, this configuration limits the efficiency loss and the acceleration of ageing process due to overheating of the solar cells. Indeed, in this configuration, the photovoltaic panels are separated from the building by an air channel and the thermally driven flow that develops in the channel helps to evacuate the heat absorbed by the panels. However, the global behaviour of the photovoltaic double-skin is complex and not yet fully understood. This study is part of a scientific project on multi-scale modelling and experimentation of BIPV components. It focuses on the experimentation of the natural convection phenomenon in double-façades. An experimental apparatus developed during C. Daverat's thesis models the double-façade by a vertical channel with wall heating. The working fluid is water so as to avoid radiative heat transfer between walls. The experimental apparatus consists of a 65 cm high vertical channel, with isoflux heating, immersed in a 1.5 m high water tank. The fluid flow is instrumented with measurements of heat flux, wall temperature and velocity. The velocity measurements are made by Particle Image Velocimetry and Laser Doppler Velocimetry. Two heating configurations are studied: symmetrical (same heat flux is imposed on both walls) and asymmetrical (only one wall is heated, the other one being adiabatic). For the study with symmetrical heating configuration, experimental data from Daverat's thesis are analysed by a zonal approach. The channel is split into several zones and a scaling analysis is conducted in order to explain experimental observations. Thus, the study focuses on heat transfer, pressure evolution in the channel and fluctuations, in particular, the evaluation of the maximum Reynolds stress. The asymmetrical configuration is studied for the transient regime and the steady regime. For the transient regime, early stage (first hours) is characterised in terms of wall temperature, velocity and two- or three-dimensional flow behaviour. A large-scale reversal flow is observed. The impact of external thermal stratification is also studied. For the steady regime, thermal and dynamic behaviours are studied and two different states are distinguished and characterised. Reversal flows are also observed. Finally, the influence of the Prandtl number and the channel width is discussed
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Zoubir, Amine. „Etude des transferts thermo-convectifs dans un canal semi-ouvert : Application aux façades type double-peau“. Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0003/document.
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Notre investigation porte sur la simulation numérique des échanges thermo-convectifs dans un canal vertical ouvert à flux imposé. Cette étude rentre dans le cadre des recherches sur le rafraîchissement passif des composants PV intégrés au bâtiment. À cet effet, un code numérique en Différences Finies est utilisé pour résoudre les équations de Navier-Stokes et simuler la convection naturelle dans un canal. Ce problème reste difficile à résoudre parce que l'écriture des conditions aux limites d'entrée et de sortie reste un problème ouvert. Notre travail consiste d'abord en étude des différentes conditions aux limites pour le benchmark numérique AMETH. Les travaux réalisés ont permis de faire un premier choix sur les conditions aux limites. L'étude s'oriente ensuite sur la qualification et la quantification numériques et expérimentales pour deux fluides : l'air (convection-rayonnement) et l'eau (convection pure). Les résultats numériques/expérimentaux ont été comparés et les discordances ont été analysées. Plusieurs aspects phénoménologiques (rayonnement entre surfaces, variation des propriétés thermo-physiques, variation du nombre de Prandtl) ont été abordés afin de caractériser leurs influences respectives sur l'écoulement et le transfert thermique. Enfin, dans le but d'apporter des éléments de réponses sur les conditions aux limites dynamiques, nous avons simulé la convection naturelle d'un canal dans une cavité et tenté une modélisationThe present investigation deals with natural convection flow in a vertical open-ended channel with wall constant heat flux. This study falls under the framework of research on passive cooling of building integrated PV components. For this purpose, a numerical code developed with Finite Differences scheme is used to solve Navier-Stokes equations and simulate the natural convection in a channel. This problem is difficult to solve because the writing of inlet/outlet boundary conditions remains an open problem. First, our work consists of studying different boundary conditions for the the numerical benchmark AMETH. The work carried out has enabled a first choice of boundary conditions. The study then focuses on numerical and experimental quantification and qualification for two fluids : air ( convection - radiation) and water ( pure convection) . Experimental and numerical results were compared and discrepancies were analyzed. Several phenomenological aspects ( surface radiation, thermophysical properties variation, Prandtl number variation ) were discussed in order to characterize their influence on flow and heat transfer. Finally, in order to provide some answers on dynamical boundary conditions, we simulated natural convection of a channel inside a cavity and tried a modeling
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Hamzaoui, Ahmed Farouk. „Optimisation des stratégies logistiques de tarification, distribution et réemploi dans les chaînes d'approvisionnement à double canal“. Electronic Thesis or Diss., Université de Lorraine, 2024. http://www.theses.fr/2024LORR0149.
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L'essor du commerce électronique a considérablement modifié les comportements d'achat des consommateurs, les poussant vers les achats en ligne. Cette transformation a rendu les chaînes d'approvisionnement traditionnelles à canal unique insuffisantes, souvent au détriment des profits. En réponse, de nombreuses entreprises ajoutent désormais une présence en ligne en plus de leurs magasins physiques. Cette évolution a conduit les entreprises, petites et grandes, à adopter des chaînes d'approvisionnement à double ou multiple canal de distribution pour élargir leur clientèle et augmenter leur part de marché. Alors, cette thèse vise à apporter des contributions à la gestion des opérations liées à la chaîne logistique, à examiner la chaîne d'approvisionnement à double canal de distribution avec logistique inverse, et à définir des stratégies de vente, de tarification et de services pour instaurer une politique gagnant-gagnant entre les deux canaux de venteThe rise of e-commerce has significantly altered consumer purchasing behaviors, driving them towards online shopping. This transformation has rendered traditional single-channel supply chains insufficient, often to the detriment of profits. In response, many companies now add an online presence alongside their physical stores. This evolution has led businesses, both small and large, to adopt dual or multi-channel distribution supply chains to expand their customer base and increase their market share. Therefore, this thesis aims to contribute to the management of operations related to the supply chain, to examine the dual-channel distribution supply chain with reverse logistics, and to define sales, pricing, and service strategies to establish a win-win policy between the two sales channels
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GAGNON, YVES. „Etude numerique d'ecoulements recircules a grand nombre de reynolds par methode des vortex aleatoires : application au canal a expansion simple et au canal a expansion double“. Toulouse 3, 1989. http://www.theses.fr/1989TOU30155.
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Ce travail montre la precision et la convergence de la methode des vortex aleatoires (random vortex method) pour la simulation d'ecoulements de fluide recircules a grand nombre de reynolds. Les ecoulements etudies sont instationnaires, bidimensionnels et dans le regime turbulent. La premiere geometrie est un canal a parois paralleles incorporant une expansion brusque sous la forme d'une marche simple; tandis que la deuxieme geometrie est un canal a parois paralleles incorporant une expansion brusque sous la forme d'une marche double symetrique. La methode des vortex aleatoires, une methode lagrangienne et sans grille, resout les equations completes de navier-stokes et l'equation de continuite, avec les conditions aux limites appropriees, en utilisant une formulation dans les variables de vorticite. Afin de valider le modele numerique, nous presentons les resultats numeriques sous forme de champs de vorticite, profils de vitesses, lqignes de courant, champs et profils de pression, statistiques de turbulence, analyses de correlation et analyses frequentielles. Les resultats numeriques sont compares a des resultats experimentaux publies dans la litterature
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Niescierowicz, Katarzyna. „Développement de la technologie des récepteurs couplés à un canal ionique pour des études structure-fonction des récepteurs couplés aux protéines G et du canal Kir6.2“. Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-01067669.
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Les Récepteurs Couplés à un Canal Ionique (ICCRs) sont des canaux ioniques artificielscréés par fusion d'un Récepteur Couplé aux Protéines G (RCPG) au canal ionique Kir6.2. Dansce concept, le canal agit comme un rapporteur direct des changements conformationnels desRCPGs permettant de détecter par simple mesure de courant, la fixation d'agonistes etd'antagonistes proportionnellement à leur concentration.Le signal induit étant directement corrélé à l'activité du récepteur, indépendamment desvoies de signalisation des protéines G, nous avons exploité cet avantage pour étendre le champd'applications des ICCRs au cours de cette thèse. Nous avons développé quatre applications quisont: 1) la caractérisation fonctionnelle des RCPG optimisés pour la cristallisation par insertionde domaine du lysozyme du phage T4 dans la boucle ICL3; 2) la détection de la dépendance desRCPGs au cholestérol; 3) la détection de ligands dits "biaisés" pour faciliter leur criblage; et 4) lacartographie fonctionnelle des portes du canal Kir6.2 régulées par des protéines membranairesinteragissant par le domaine N-terminal.
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CHARLIER, SERGERE LAURENCE. „Fermeture du canal arteriel par catheterisme interventionnel avec une double ombrelle de rashkind : a propos de 25 cas“. Clermont-Ferrand 1, 1994. http://www.theses.fr/1994CLF1M011.
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Shchepetov, Andrey. „Étude et fabrication de dispositifs nanométriques pour applications THz“. Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10069/document.
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Les applications émergentes dans la gamme des fréquences Térahertz (THz, 10¹² Hz) stimulent le développement des composants actifs et passifs rapides ainsi que des émetteurs et des détecteurs de radiation travaillant dans ce domaine. Les dispositifs actuels ne répondent pas à tous les besoins de l'industrie à cause de la consommation, la taille et le coût très importants. La solution pour la réalisation des émetteurs et des détecteurs peut venir des transistors à ondes plasma que nous avons étudiés. Ce sont les composant à base de HEMT Ill-V exploitants les nouvelles propriétés de transport électronique. Les mesures de ces dispositifs ont montré les possibilités de l'émission et de la détection de la radiation autour de 1 THz, à température basse et ambiante. Une détection résonante avec une fréquence ajustable est possible. D'un autre côté il est nécessaire de réaliser les composants actifs électroniques (transistors) capables de fonctionner aux fréquences proches du THz. Ceci est nécessaire pour la réalisation des circuits rapides comme les amplificateurs, les mélangeurs et autres. Pour répondre à cette demande, nous avons étudié deux types de transistors double-grilles. Les mesures ont prouvé l'amélioration des performances statiques et dynamiques (saturation de courant de drain et courant de drain maximal, efficacité de commande, transconductance et conductance de sortie, fréquences de fonctionnement). De plus, la consommation aux performances équivalentes est plus faible. Les simulations montrent que les performances peuvent être améliorées d'avantageThe emergent applications in the Terahertz (THz) frequencies range stimulate the development of active and passive rapid devices as much as of emitters and detectors working in this domain. Actually existent devices do not respond to all industry needs because of too high consumption, size and cost, and other inconvenient. A solution for realisation of emitters and detectors could come from plasma-wave transistor that we studied. These devices are based on 1I1-V HEMT and utilised a particular behaviour of electronic transport. Measurements have shown the possibility of emission and detection of radiation at about 1 THz. From the other hand it is necessary to realize electronic active devices (transistors) able to operate near the THz range. This is necessary for realisation of rapid integrated circuits such as amplifiers, mixers and so on. To do this we have chosen to study two kinds of double-gate transistors. Measurements have shown the increasing of static and dynamic performances (maximum drain current and drain current saturation, efficiency of charge control, transconductance, output conductance, operation frequencies). Besides, the same performances can be obtained at lower consumption. Simulations show that performances could be improved even more
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Malbert-Colas, Laurence. „Recherche et identification de partenaires du canal épithélial à sodium ENaC : étude du rôle potentiel de ces partenaires dans la régulation de l'activité de ENaC“. Paris 7, 2003. http://www.theses.fr/2003PA077168.
Der volle Inhalt der QuelleBücher zum Thema "Double canal"
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Limited, Compass Maps. Venice Popout Map: Venezia E Il Canal Grande/Venice and the Grand Canal : Double Map (Europe Popout Maps). 4. Aufl. Compass Maps, 1998.
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Kraska, James. Contemporary Maritime Piracy. ABC-CLIO, LLC, 2011. http://dx.doi.org/10.5040/9798400631368.
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This volume provides a concise introduction to the issues and debates regarding modern piracy, including naval operations, law, and diplomacy, and focuses on the recent surge of attacks off the coasts of Africa and Asia. In the past decade, the incidence of maritime piracy has exploded. The first three months of 2011 were the worst ever, with 18 ships hijacked, 344 crew taken hostage, and 7 crew members murdered. The four Americans on board the sailing vessel Quest were shot at point-blank range. The economic costs are also staggering, reaching $7 to $12 billion per year, as insurance costs skyrocket, ransoms double and then quadruple, and ships are forced to hire armed security for protection. Pirates operating off the Horn of Africa disrupt shipping traffic through the strategic Suez Canal, siphoning transit fees from an unstable Egypt, while the seizure of supertankers in the Indian Ocean underscores the vulnerability of the world's oil supply. Governments, private industry, and international organizations have mobilized to address the threat. This is the first volume to examine their work in developing naval strategy, international law and diplomacy, and industry guidelines to suppress contemporary maritime piracy. Contemporary Maritime Piracy: International Law, Strategy, and Diplomacy at Sea comprises three sections, the first of which contains chapters on historical and contemporary piracy, international law and diplomacy, and coalition strategies for combating future piracy. The second and third parts provide collections of historic profiles and relevant documents.
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de Saint Aubert, Emmanuel. Rereading the Later Merleau-Ponty in the Light of his Unpublished Work. Herausgegeben von Dan Zahavi. Oxford University Press, 2018. http://dx.doi.org/10.1093/oxfordhb/9780198755340.013.24.
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Access to a large number of unpublished manuscripts allows us to follow the continuity of Merleau-Ponty’s thought from his first to his last writings, to uncover its double critical constitution, anti-Cartesian and anti-Sartrean, and to understand the status of this philosophy of the flesh as it establishes itself as ontology. This philosophy is geared toward a never-abandoned methodological challenge to grasp humanity first as another manner of being a body, the challenge of thinking a corporeity which is always already, in the very principle of its animation, intercorporeity. Through his continual pursuit of a phenomenology of perception, its insistence on the motifs of depth, the inexhaustible, the invisible, and incompletion, Merleau-Ponty’s carnal ontology proceeds in the discovery of the common negativity of human beings and the world, of myself and others, which affects its conception of being.
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Crouch, Tammy. Carpal Tunnel Syndrome and Repetitive Stress Injuries: The Comprehensive Guide to Prevention, Treatment, and Recovery. Frog, Ltd., 1996.
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Wears, Robert, und Kathleen Sutcliffe. Still Not Safe. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190271268.001.0001.
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Patient safety suddenly burst into public consciousness in the late 1990s and became a “celebrated” cause in the 2000s. It has since gradually faltered, and little improvement has been noted over almost 20 years. Both the rise and fall of patient safety demand explanation. Medical harm had been known long before the 1990s, so why did it suddenly become popular? And why were safety efforts ineffective? The authors propose that this rise was due to a discursive shift that reframed “medical harm” into “medical error” in the setting of anxiety about industrialization and great change in healthcare. The “error” framing, with its inherent notion of agency, was useful in advancing the agenda of a technocratic, managerial group of health professionals and diminishing the authority of the old guard based on clinical expertise. The fall was due to this “medicalization” of safety. Health professionals and managers with little knowledge of safety science came to dominate the patient safety field, crowding out expertise from the safety sciences (e.g., psychology, engineering) and thus keeping reform under the control of the healthcare establishment. Operating with a sort of delusional clarity, this scientific-bureaucratic cabal generated a great deal of activity but made little progress because they failed to engage with expertise in the safety sciences. Twenty years after sudden popularity, there is general agreement that little of value has been achieved. The future of patient safety is in doubt, and radical reform in approaches to safety will be required for progress to be made.
Buchteile zum Thema "Double canal"
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Onchis-Moaca, Darian, Simone Zappalá, Smaranda Laura Goţia und Pedro Real. „Double Hough Transform for Estimating the Position of the Mandibular Canal in Dental Radiographs“. In Applications of Computer Algebra, 317–27. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-56932-1_22.
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Tang, Ying, Chunze Liu, Fengshuai Cao und Jianping Shang. „Analysis on Throughput Capacity of Water-Saving Ship Lock in Simulation Method“. In Lecture Notes in Civil Engineering, 294–304. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6138-0_26.
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AbstractWhen the double-line water-saving ship locks operate in the mode of filling and emptying mutually, the filling water process of one lock chamber and emptying water process of the other one are carried out at the same time, thus the situation of chambers waiting for each other is inevitable. Besides, the variation of ship navigating speed and safety interval time between two adjacent ships may have a more significant impact on the operation efficiency of the ship lock, which cannot be ignored. Combined with the actual condition of a planned lock on a canal in China, the throughput capacity and operation efficiency of the double-line water-saving ship locks under the mode of filling and emptying mutually are studied. A coupled operation simulation model of double-line locks is established, in which the mode of filling and emptying water mutually or independently is adopted. In the model, the whole operation processes of the locks are simulated. The simulation results show that the throughput capacity of the planned ship lock is reduced by 5.6%–7.8%, and the average lockage time is increased by about 10.8%, when comparing the mode of filling and emptying water mutually with independently. Besides, using average value of speed and safety interval time of ships is acceptable when doing research on the throughput capacity and operation efficiency of ship locks. The achievements can provide technical support for the analysis of the throughput capacity and operation efficiency of the water-saving ship lock.
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Alfieri, O., und B. De Mol. „Correction of Mitral Incompetence in Atrioventricular Canal Defects with Double-Orifice Mitral Valve: The Triple-Orifice Repair“. In Cardiac Reconstructions, 25–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-74629-1_5.
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Cornog, Evan. „The Canal And Its Consequences“. In The Birth Of Empire, DeWitt Clinton and the American Experience, 1769—1828, 158–72. Oxford University PressNew York, NY, 1998. http://dx.doi.org/10.1093/oso/9780195119497.003.0013.
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Abstract In New York State, it was the canal’s physical presence that was easiest to under stand. The Erie Canal was, in essence, a trench forty feet wide, four feet deep, and 363 miles long. Because Lake Erie was nearly 600 feet higher in elevation than the Hudson River at Albany, the waterway had to rise through eighty-three locks, including a five-tiered set of double locks at Lockport (near Buffalo) that Thurlow Weed pro claimed ‘will probably remain for ages as a monument of American Genius and American patriotism.’ To carry the canal across the Genesee River an aqueduct 802 feet long was raised, spanning the river on stone arches. The engineers in charge of work had limited experience, and their need for more trained help was one of the motives that led to the founding of Rensselaer Polytechnic Institute in 1824, the nation’s first school dedicated to civil engineering.
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Hunneyball, Paul M. „Stylistic Innovation: Processes and Constraints“. In Architecture and Image-Building in Seventeenth-Century Hertfordshire, 72–94. Oxford University PressOxford, 2004. http://dx.doi.org/10.1093/oso/9780199263868.003.0004.
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Abstract In June 1690 Henry Guy, the wealthy former Treasury Secretary, received the signal honour of a visit by William III to his country seat, Tring Park. The house itself was a striking example of the latest taste, but the equally progressive gardens which Guy had planted around it were even more eye-catching. Although constrained in scale by the lack of a park, the basic layout was one of great splendour and formality, developed around vistas which led from the mansion’s three show-fronts. One main axis of the gardens featured a lengthy double avenue graced with ponds and a canal. The other took in ornamental shrubbery, two huge parterres which sloped down to a second canal, wide lawns, and a profusion of pavilions.
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Ginor, Isabella, und Gideon Remez. „The Soviet Regulars Move In“. In The Soviet-Israeli War, 1967-1973, 135–50. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190693480.003.0011.
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The personnel of the Soviet expeditionary force to Egypt was carefully selected, screened (for Jews and other undesirable element) and trained for desert warfare, in parallel with Egyptian crews who were ultimately to take over the weapons. The MiG-21 fighters of interceptor squadrons were transported to Egypt in a new airlift. Meanwhile Israeli air attacks foiled foiled Egyptian attempts to station SAMs along the Suez Canal, and a Soviet-made radar station was lifted by an Israeli heliborne raid, Yet-inconclusive testimonies indicate that a Soviet tank force was landed at Alexandria to protect the “Kavkaz” formations. The Israeli “depth bombings” caused casualties among the Soviet advisers, exacerbating Moscow’s motivation to counter them. The first report from a newly recruited Israeli spy, Ashraf Marwan, established the false version of a secret visit by Nasser to Moscow – the first instance of his actual operation as an Egyptian double agent. Soviet and Egyptian naval units failed to intercept five Israeli missile boats that evaded the French embargo to sail home.
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Ruggiero, Maria Elisabetta. „Naumachia and Scientific Research in the Shade of the Trees: Experiments on Hulls in the Park of a Royal Palace“. In Progress in Marine Science and Technology. IOS Press, 2024. http://dx.doi.org/10.3233/pmst240005.
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The research illustrates the singular bivalence of the construction of the Grand Canal in the Palace of Versailles, in the seventeenth century: this body of water, more commonly interpreted as the design axis of the grandiose composition of the park and as the scene of celebrations of court splendor, was, in a sort of double life, the basin necessary for the attempt to develop checks and tests for war and merchant hulls. This peculiarity, especially if placed in relation to the tradition of the naumachia of the classical and Renaissance periods, constitutes an important testimony to the importance of naval culture and development which, precisely in the following century, will find its full evolution and scientific expression. If at the time of Louis XIV the Science of Naval Architecture, in fact, had not yet reached a complete methodological structure, in these episodes of empirical studies we can read the prodromes of thought and organization that would follow and of which Gaspard Monge and Duhamel de Monceau would be protagonists.
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Kontturi, Katve-Kaisa. „From Double Navel To Particle-Sign: Toward The A-Signifying Work Of Painting“. In Carnal Knowledge. I.B.Tauris, 2013. http://dx.doi.org/10.5040/9780755603435.ch-001.
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Kearney, Richard, und Melissa Fitzpatrick. „Carnal Hospitality“. In Radical Hospitality, 49–58. Fordham University Press, 2021. http://dx.doi.org/10.5422/fordham/9780823294428.003.0005.
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This chapter makes a plea for a “double hospitality” involving both word and touch. An ethics of hospitality, as shown in the previous chapters, involves empathizing with others through the exchange of stories, memories, and faiths—the aim being to work through the wounds of history and open a space for charity and gift. Here law is supplemented by love; and in this step toward a higher poetics of pardon there comes a point where narrative exchange—of histories, traditions, confessions, testimonies—often needs to be supplemented by an exchange of physical gestures. A point where narrative hospitality calls for carnal hospitality. Where the textual solicits the tactile. Where word gives way to touch.
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Ginor, Isabella, und Gideon Remez. „Ceasefire Violation Seals a Strategic Gain“. In The Soviet-Israeli War, 1967-1973, 199–210. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190693480.003.0017.
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The ceasefire that ostensibly ended the War of Attrition went into effect at midnight between 7 and 8 August 1970. Within minutes, the standstill provision that the US initiative had stipulated was broken by Soviet and Egyptian advancement of SAM batteries to the Suez Canal bank. US inspection flights by U-2 spy planes began too late to document the violation, and the Soviets rejected American protests. Israel responded by suspending compliance with the rest of Rogers’s peace plan, including UN mediation – leaving the United States with little benefit but the Soviets with a major gain. However, for domestic consumption Israel declared victory, which limited effective countering of the increased threat. Nasser’s death the following month and his unexpected succession by Anwar Sadat led to doubts about continuing dependence on Moscow.
Konferenzberichte zum Thema "Double canal"
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Pauw, Bart De. „The design of the anchoring of the steel double track railway integral bridge in Mechelen contrasting the historical Vierendeel bridges“. In IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/prague.2022.0484.
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<p>In extending the existing railway infrastructure from Brussels to Antwerp, a new double track railway infrastructure has been built as a by-pass along the station in the city of Mechelen. In combination with these works, also a road infrastructure, further called the tangent road, was also constructed in which both infrastructures were bundled to the maximum. In crossing a local canal a new railway bridge is designed parallel to historical steel Vierendeel bridges and on top of the new tangent road tunnel going underneath the canal. The paper describes the final design and realization of the new railway bridge contrasting in all its aspects to the Vierendeel bridges with riveted bolt connections. The bridge consists of two lateral main girders having variable rectangular sections and is designed as an integral clamped structure without any bearings. The superstructure is fully welded and the main box girders have a maximum height of 3.65 m near the abutments. The lower flange remains almost horizontal and is slightly twisted about a horizontal axis thus becoming wider near the centre. The upper flange decreases significantly and becomes smaller near mid span where the box girder has a height of 1.65 m. This creates a waving pattern of the structure both in a horizontal plane as in the front view showing an inversed curvature near to the arch springs of the Vierendeel bridges. The concept differs from a more classical integral bridge by the extreme large stiffness of the abutments on top of the tunnel consisting of diaphragm walls. The steel structure is hereby almost perfectly clamped by post tensioning anchors.</p>
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Bosetti, F. „Structural designs that required thinking“. In AIMETA 2022. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902431-17.
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Abstract. We discussed the peculiarities of three structural projects. The El Ferdan swing bridge over the Suez Canal, the longest in the world, required the optimization of structural weight and deflection, pursed with genetic algorithms. The Museum of the Future in Dubai, is supported by a single-layer steel gridshell following a pseudo-toroidal double-curvature surface, which required the optimization of a great number of diagrid nodes, parametrically designed with a custom tool. The competition-winner project for the new Stadio Milano follows the vision of a Gothic Cathedral with slender buttresses, tall multi-storey arched frames, all covered by a first-class cable-supported glazed facade, which fulfils the clean “glass-box” architectural intent. Although very sophisticated calculation tools are available, these experiences suggest that the human contribution of the structural engineer is still, at least for now, of paramount importance.
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Rahimzadeh, Poupak. „OP010 Comparison the effects of transforaminal epidural and caudal epidural injection of calcitonin in patients with degenerative spinal canal stenosis: a double-blind randomized clinical trial“. In ESRA Abstracts, 40th Annual ESRA Congress, 6–9 September 2023. BMJ Publishing Group Ltd, 2023. http://dx.doi.org/10.1136/rapm-2023-esra.10.
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Fitzgibbon, Jenny, und Viera Husarova. „OP044 A randomised, controlled, double blind, non-inferiority study comparing periarticular block vs. adductor canal block on postoperative analgesia in patients post primary total knee arthroplasty“. In ESRA Abstracts, 41st Annual ESRA Congress, 4–7th September 2024, A37.1—A37. BMJ Publishing Group Ltd, 2024. http://dx.doi.org/10.1136/rapm-2024-esra.43.
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Van Bogaert, Philippe. „Deformation compatibility during erection of steel bridges: case of a 2-span railway truss bridge“. In IABSE Symposium, Istanbul 2023: Long Span Bridges. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2023. http://dx.doi.org/10.2749/istanbul.2023.0426.
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<p>Often insufficient attention is given to the compatibility of the deformations of steel bridges during their assembly on the construction site, especially if continuity, due to bending moments, is to be ensured at the level of intermediate supports. This does require to compensate during assembly the difference in the angular rotations at the location of the support points. The effect is especially noticeable with longer spans or with flexible superstructures. In the case of the construction of a double railway bridge over the Albert Canal (Belgium), the above was an important issue. The bridges are in the shape of a classic Warren truss girder. An unusual process was followed for the assembling on site. In the first phase, the entire lower chord, including the bridge deck, was built and supported in all nodes of the truss. The sloping diagonal bars are connected to this and the upper member of the truss is then mounted on top. In such construction the diagonal bars tend to twist and bending moments are created in the lower truss nodes. Gaps may appear in the upper nodes, due to the unequal displacements of the members to be connected. Calculations must show whether stress-free corrections can be made for the fabrication of the various bars, thus avoiding stresses due to the erection process. This example clearly shows that the compatibility of the components of steel bridges during their assembly must be determined in detail and that efficient measures are needed to compensate for defects.</p>
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Zhu, Jingli, Tianzhu Song, Lili Ding und Miao Li. „Double Root and Root Canals in Right Mandibular Cusp Teeth and Double Root Canals in Lateral Incisor Teeth: A Case Report“. In International Conference on Biotechnology and Biomedicine. SCITEPRESS - Science and Technology Publications, 2022. http://dx.doi.org/10.5220/0012014900003633.
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Qurbanova R.Sh., Asadova Sh.Sh., Vahabova Sh.B., Qurbanova R. Sh ,. Asadova Sh Sh ,. Vahabova Sh B. „CLİNİCAL AND MORPHOLOGİCAL PATTERNS OF ENDOCCRİNE-CELL CARSİNOMA OF UTERİ“. In THE FIRST INTERNATIONAL SCIENTIFIC – PRACTICAL VIRTUAL CONFERENCE IN MODERN & SOCIAL SCIENCES: NEW DIMENSIONS, APPROACHES AND CHALLENGES. IRETC, 2022. http://dx.doi.org/10.36962/mssndac-01-11.
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The relevance of the problem. The endicrine-cell carsinoma of corpus uteri and of the cervex uteri remains insufficiently studied, from clinical and proqnosis point of view insignificant group of malignant epithelial organ tumors. The purpose of the study. Taking into consideration all stated above, as the goal of current investigation has been appeared complex statistic, clinic, laboratory-instrumental and morphological study of this cancer with comparative analysis of results in different types of treatment, and also including progression and prognosis of the process. Material and methods. 405 cases of endocrine cell carcinoma of corpus uteri were identified within 2016- 2021. Complaints, anamnesis and clinical stages of the process approximately didn’t differ from the analogous groups of comparison of patient by the moment of appeal for the specialized aid. The obtained results and their discussion. It was determined that the fraquancy of countering of the endocrine cell carcinoma of corpus uteri is 26,1%, but the cancer of cervix uteri 12,7% from total number patients, respectively. It was proved that there exists the direct correlation between the frequency of endocrine cell carcinoma of corpus uteri and anatomical section of organ. In 56,0% od cases primary tumor origin is situated in lower segment of corpus, circus cervix or proximal part of cervical canal. “Carcinoids” and “Small cell homomorphous solid squamous cell and glandular carcinoids” were encountered most frequently among histotypes and the versions. Morphologically in tumor tissue were revealed mono and double specialized apudocytes, producing olygopeptides and amines with paraendocrine effects. Proceeding from secretory status of the endocrine tumor component were distinguished following clinical-morphological subgroups of endocrine cell carcinoma of corpus utseri: 1) with prevailing secretion of peptides (excluding the somatostatin); 2) with prevailing secretion of amines and somatostatin; 3) with similar secretion of peptides and amines. It was proved that, there is direct close correlation between prevailing hormonal status and clinical progression of endocrine-cell carcinoma of corpus uteri. Despite of somatostatin predominant secretion of oligopeptides by the tumor accelerates clinical progression, and brings to early and multidirectional metastases. On the contrary, with prevailing secretion of amines (serotonin, melatonin) and somatostatin the process doesn’t improving, and metastases, also, recurrences after radical therapy isn’t seen. It was revealed, that when choosing the tactic of radical treatment, side by side with the other factors, must be taken into consideration the hormonal status of endocrine-cell carcinoma of corpus uteri. High prevalence of secretion of oligopeptides in endocrine-cell carcinoma of corpus uteri can be useful in direct indication for choosing of complex or combinative treatment with necessary use radical surgical operation. Keywords: distinguished following clinical-morphological subgroups.
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Hasanspahić, Nermin, Vlado Frančić, Marko Strabić und Ivan Krivokapić. „Analysis of human factors in container ships' marine accidents“. In 2024 AHFE International Conference on Human Factors in Design, Engineering, and Computing (AHFE 2024 Hawaii Edition). AHFE International, 2024. http://dx.doi.org/10.54941/ahfe1005793.
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Around 80% of the world’s trade is transported by sea, and more than half of it is transported by containers. Container ships are getting bigger and bigger, and their average size has doubled in the last 20 years. Their size has increased from 1st-generation ships that could carry about 1000 Twenty-foot Equivalent Units (TEU) to ships carrying 24000 TEU. However, accidents involving giant container ships can cause catastrophic consequences for world trade and the global economy; such was the case with the grounding of the container ship Ever Given in the Suez Canal in 2021. Therefore, it is imperative to reduce the probability that such accidents will occur by improving the safety of container ships. In addition, according to literature, about 85% of marine accidents are caused by human factors, so to understand accidents’ origin and causes, there is a need to meticulously examine accidents, namely safety accident investigation reports, to classify human and other factors of accidents, such as organizational ones. This process leads to determining the most common factors, enabling suggestions for corrective measures, and implementing proactive ones. The investigation and analysis of marine accidents is a corrective approach where the immediate and root causes of accidents are discovered. Based on the analysis of accident investigation reports, suggestions for the reduction of such unwanted events can be brought to light.In this paper, the marine accident reports involving container ships are analyzed using the Human Factor Analysis and Classification System for Marine Accidents (HFACS-MA) method, aiming to determine the most frequent marine accident causes connected to human factors. Based on the results of the analysis, associated corrective safety measures are proposed.
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Pérez Monge, Luis Alonso. „La infraestructura que desdibuja una frontera“. In Seminario Internacional de Investigación en Urbanismo. Bogotá: Universidad Piloto de Colombia, 2022. http://dx.doi.org/10.5821/siiu.10059.
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Technological advances, the immediacy due to accessibility, speed and connectivity, have modified the notion of time and the way we perceive space. This has had an impact on the way of understanding and transiting borders, in some conflictive cases they have put aside political differences, in order to have a better global competitive position, seeking new ways of dialogue, pacts and reopening, through development of connectivity projects that articulate the territory. Central America is no exception, where neighbors Nicaragua and Costa Rica plan independent transoceanic trade crossings just 50km from each other, with their border line in the middle of their proposals. This would double the services and cause a natural impact. Therefore, it is pertinent to propose a unified and collaborative project that achieves an articulation of the systems and breaks with the segregation generated by the border transnational cohesion from the infrastructural systems.
Keywords: Infrastructure, border, integration, canals.
Topic: Analysis and territorial project. Los avances tecnológicos, la inmediatez por la accesibilidad, la velocidad y la conectividad, han modificado la noción del tiempo y la manera en cómo percibimos el espacio. Esto ha repercutido en la manera de entender y transitar las fronteras, en algunos casos conflictivos han dejado de lado las diferencias políticas, con el fin de tener una mejor posición global competitiva, buscando nuevas vías de diálogo, pactos y reaperturas, por medio del desarrollo de proyectos de conectividad que articulan el territorio. Centroamérica no es la excepción, donde los vecinos Nicaragua y Costa Rica plantan pasos comerciales transoceánicos independientes a tan sólo 50km entre ellos, con su línea fronteriza en medio de sus propuestas. Esto duplicaría los servicios y provocaría un impacto natural. Por lo que es pertinente plantear un proyecto unificado e integral, que logre una articulación de los sistemas y rompa con la segregación que genera en esta franja territorialmente sensible.
Palabras clave: infraestructura, frontera, integración, canales.
Bloque temático: Análisis y proyecto territorial.
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Elias, A., G. Le Corff, J. L. Bouvier, Ph Villain und A. Serradimigni. „DISCREPANCIES BETWEEN VENOGRAPHY AND REAL TIME B MODE ULTRASOUND IMAGING IN THE DIAGNOSIS OF DEEP VEIN THROMBOSIS“. In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1642892.
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Methods : in this prospective study, real time B Mode ultrasound imaging (USI) was compared to bilateral ascending contrast venography, double blindly, in 430 patients suspected of deep vein thrombosis (DVT) or pulmonary embolism.A complete scan of the venous system from the inferior vena cava to the calf veins, was performed with a high resolution duplex system (DIASONICS DRF 400) and coupled systematically with a C.W. Doppler examination. The results obtained by USI were thus compared to the venograms performed on a total of 854 legs.Results : there are corresponding results in 95% of the legs (808/854). If we consider venography as the standard of reference, the sensitivity of USI is 98% (325/333) and the specificity 94% (483/514). Isolated calf vein thrombosis are detected in 91% (84/92) of the legs and proximal DVT in 100% (241/241) in this series whatever the topography and the extension of the thrombosis and whatever the degree of the obstruction of the vein.Discrepancies found in 46 legs are related to :- 8 DVT located in the calf (6 in the presumed healthy leg) diagnosed only by venography.- 27 DVT (18 distal, 9 femoral or iliac) detected only by USI- 9 doubtful examinations with USI not confirmed by venography- 2 doubtful venograms with negative USI test.Comments : Calf vein thrombosis especially located in the soleal sinuses and the gastrocnemius with in most cases the direct image of the thrombus are more often detected by USI provided that the technique and the equipment are appropriate.The absence of visualisation of venous segments with venography is not specific of venous thrombosis. These veins non affected by the thrombosis are not filled by the contrast medium when located above in occluded ilio-femoral or ilio-caval junction or when they are the site of extrinsic compression. The direct image of the vein and the surrounding structures obtained with USI enhances the diagnostic sensitivity and specificity and provides precision of the exact extension of the thrombosis.Due to these differences, can venography still be considered as the standard of reference in the diagnosis of DVT and their precise localisation ?
Berichte der Organisationen zum Thema "Double canal"
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Gardner, Coral, Matt Goode, Tom Philippi und Don Swann. Using transect sampling and road cruising surveys to estimate abundance and distribution of sidewinders (Crotalus cerastes) in Saguaro National Park, Tucson Mountain District: Final report. National Park Service, 2024. http://dx.doi.org/10.36967/2302204.
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Saguaro National Park, Tucson Mountain District (TMD) includes a portion of the Tucson Mountains and adjacent lower bajada landscapes along the western boundary in Avra Valley. Threats to TMD include urban encroachment, busy commuter roads running through the interior and along the boundaries, agricultural development, and the Arizona Canal and water recharge basin. Plans to route Interstate 11 within 400 m of the western boundary have led to concerns over projected negative impacts on wildlife. Among the species of concern is the Sidewinder (Crotalus cerastes), primarily because the population residing in TMD represents the easternmost distribution of this iconic species. Historical records are limited to a handful of localities; however, given their cryptic lifestyle, and the lack of intensive survey effort, there was a need to determine if the species is truly rare or just apparently rare but difficult to detect. To better inform management, we used distance sampling along transects and washes and road cruising surveys to examine density and distribution of Sidewinders in TMD. From May-September, 2022, encompassing both the dry pre-monsoon season and the wet monsoon season, we conducted 519 distance sampling surveys totaling 814.61 km and 69 road cruising surveys totaling 1,997.47 km in upland and wash environments. Our efforts produced 421 total snake observations, which included only nine Sidewinder observations. The small number of Sidewinders observations proved to be insufficient for model convergence. Although we were unable to obtain density estimates of Sidewinders, data from both distance sampling and road cruising surveys provided valuable information on distribution of the species. As expected, we only observed Sidewinders in the westernmost portion of TMD in sandy environments dominated by yellow palo verde and creosote bush. Because we observed a relatively large number (n = 229) of Western Diamond-backed Rattlesnakes (Crotalus atrox), the most commonly observed species, we were able to obtain robust density estimates, which has rarely been done for snakes of any kind. Results revealed that C. atrox density varied by season, with more than double the number of detections during the rainy monsoon season, compared to the dry pre-monsoon season. We recommend that TMD staff conduct repeated road cruising surveys over time to make inferences about population trends that can be compared before and after construction of I-11.
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Muxo, Robert, Kevin Whelan, Robert Muxo und Kevin Whelan. Colonial nesting birds in Biscayne National Park: 2021?2022 nesting year summary. National Park Service, 2024. http://dx.doi.org/10.36967/2304740.
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The habitats within Biscayne National Park consist of rocky coast lines, Biscayne Bay (a shallow water bay), over 40 mangrove islands, and coral reefs. This ecosystem lies near the large metropolitan area of Miami, suburban development, a nuclear power plant, and has several canals that drain from the mainland into Biscayne National Park or close to park boundaries. As a result of the park?s proximity to a large population, it endures heavy usage. The park is a popular destination for anglers and boaters. All the aforementioned factors put stressors on the park ecosystem. The South Florida/Caribbean Network has developed a long-term monitoring program that focuses on the colonial nesting birds that use park resources for foraging, roosting, and nesting. The South Florida/Caribbean Network uses monthly helicopter flights to survey nine nesting colonies in or near the park. The nine colonies monitored are: Kings Road, Mangrove Key, West Arsenicker Key, Arsenicker Key, Jones Lagoon, Ragged Key 4, Ragged Key 5, Soldier Key, and Kings Bay. We focus on six species of birds: double-crested cormorants (Phalacrocorax auritus), great egrets (Ardea alba), great white herons (Ardea herodias occidentalis), great blue herons (Ardea herodias), white ibises (Eudocimus albus), and roseate spoonbills (Platalea ajaja). Data collection for this vital sign began in 2009. This report presents data regarding peak nesting, nesting indices, species abundance, and the nine nesting colonies. No forecasts are presented from the data collected in this report. Peak nest counts for five of the six focal species were lower in 2021?2022 than 2020?2021, except for white ibis, which increased relative to the previous nesting season. For the fourth consecutive season, peak nest counts for double-crested cormorants remain under 1,000 nests. For the number of species actively nesting by colony, our data indicate that two colonies increased, four colonies decreased, and three colonies remained the same relative to the previous nesting season. At least one of the focal species nested at all nine colonies, which has been consistent since the start of surveys.