Bibliografias temáticas / Fixed arches

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Literatura científica selecionada sobre o tema "Fixed arches"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 4 de fevereiro de 2022

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Artigos de revistas sobre o assunto "Fixed arches"

Pi, Y. L. "Elastic flexural-torsional buckling of fixed arches". Quarterly Journal of Mechanics and Applied Mathematics 57, n.º 4 (1 de novembro de 2004): 551–69. http://dx.doi.org/10.1093/qjmam/57.4.551.

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Xi, Kuan Tang, Jin Li, Tie Gang Zhou e Qing Xing Xu. "Out-of-Plane Stability Analysis of U-Section Pin-End Steel Arch". Applied Mechanics and Materials 351-352 (agosto de 2013): 169–73. http://dx.doi.org/10.4028/www.scientific.net/amm.351-352.169.

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Two kinds of finite element model which can reflect the effects of different loading positions were constructed with Beam 188 and Shell 181. Effects of different restraints, load models and rise-span ratios on out-of-plane buckling were studied by comparing results of fixed arches with that of pin-end arches under three loading models. It is conservative to design by employing results of radial loading. As for out-of-plane stability, pin-end arches are better than fixed arches when rise-span ratio is big. Compared with U-section pin-end circular arches with diaphragm, those with batten plates have batter out-of-plane stability, and they are more economical and easier to construct.

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Xi, Kuan Tang, Jin Li, Tie Gang Zhou e Tao Lin. "Out-of-Plane Stability Analysis of I-Section Steel Arch". Applied Mechanics and Materials 405-408 (setembro de 2013): 781–85. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.781.

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Finite element model which can reflect the effects of different loading positions were constructed with Beam 188. Effects of different restraints, load models and rise-span ratios on out-of-plane buckling were studied by comparing results of fixed arches with that of pin-end arches under three loading models. It is conservative to design by employing results of radial loading. For ideal restraints, out-of-plane stability of pin-end arches is better than fixed arches when rise-span ratio is big. Effects of different loading positions on out-of-plane buckling were studied. Buckling loads of arches which are loaded at arch-axises are bigger than those of top flanges, but smaller than those of bottom flanges.

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Liu, Airong, Zhicheng Yang, Hanwen Lu, Jiyang Fu e Yong-Lin Pi. "Experimental and analytical investigation on the in-plane dynamic instability of arches owing to parametric resonance". Journal of Vibration and Control 24, n.º 19 (11 de agosto de 2017): 4419–32. http://dx.doi.org/10.1177/1077546317726210.

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When an arch is subjected to a periodic load, it may lose in-plane stability dynamically owing to parametric resonance. Previous investigations have been concentrated on in-plane dynamic buckling of pin-ended shallow arches. However, in engineering practice, fixed arches with different rise-to-span ratios are often encountered. Little research on in-plane dynamic instability of deep fixed arches has been reported in the literature. This paper is concerned with experimental and analytical investigations for in-plane dynamic instability of fixed circular arches with rise-to-span ratios 1/8–1/2 under a central periodic load owing to parametric resonance. Experiments are carried out to determine the in-plane frequency and damping ratio of arches, to investigate critical regions of frequencies and amplitudes of the periodic load for in-plane dynamic instability of arches, and to explore effects of the rise-to-span ratio and additional weights on dynamic instability. The analytical method for determining the region of excitation frequencies and amplitudes of the periodic load causing in-plane instability of the arch is established using the Hamilton’s principle by accounting for effects of additional concentrated weights. Comparisons of analytical solutions with test results show that they agree with each other quite well. These results show that the rise-to-span ratio significantly influences the bandwidth of regions of critical excitation frequencies for in-plane dynamic instability of arches. The critical frequencies of the periodic load and their bandwidth increase with a decrease of the rise–span ratio of the arch, whereas the corresponding amplitude of the periodic load decreases at the same time. It is also found that the central concentrated weight influences in-plane dynamic instability of arches significantly. As the weight increases, the critical frequencies of excitation and their bandwidth for in-plane dynamic instability of arches decreases, whereas the corresponding amplitude of excitation increases.

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Sabale, Aditya, e K. V. Nagendra Gopal. "Nonlinear In-Plane Stability of Deep Parabolic Arches Using Geometrically Exact Beam Theory". International Journal of Structural Stability and Dynamics 18, n.º 01 (janeiro de 2018): 1850006. http://dx.doi.org/10.1142/s0219455418500062.

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In this paper, we investigate the in-plane stability and post-buckling response of deep parabolic arches with high slenderness ratios subjected to a concentrated load on the apex, using the finite element implementation of a geometrically exact rod model and the cylindrical version of the arc-length continuation method enabled with pivot-monitored branch-switching. The rod model used here includes geometrically exact kinematics of the cross-section, exact kinetics, and a linear elastic constitutive law; and advantageously employs quaternion parameters to treat the cross-sectional rotations and to compute the exponential map in the configurational update of rotations. The evolution of the Frenet frame along the centroidal curve is used to determine the initial curvature of the rod. Three sets of boundary conditions, i.e. fixed–fixed (FF), fixed–pinned (FP) and pinned–pinned (PP), are considered, and arches with a wide range of rise-to-span ratios are analyzed for each set. Complete post-buckling response has been derived for all cases. The results reveal that although all the PP arches and all the FF arches (with the exception of FF arches with rise-to-span ratio less than 0.3) considered in this study buckle via bifurcation, the nature of stability of the different solution branches in the post-buckling regime differs from case to case. All FP slender parabolic arches exhibit limit-point buckling, again with several markedly different post-buckling behaviors. Also, some arches in the FF and PP case are shown to exhibit a clear bistable behavior in the post-buckled state.

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Song, Xi, e Shi Rong Li. "Nonlinear Stability of Fixed-Fixed FGM Arches Subjected to Mechanical and Thermal Loads". Advanced Materials Research 33-37 (março de 2008): 699–706. http://dx.doi.org/10.4028/www.scientific.net/amr.33-37.699.

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Based on Kirchhoff’s assumption of straight normal line of beams and considering the effects of the axial elongation, the initial curvature and the stretching-bending coupling on the arch deformation, geometrically nonlinear governing equations of functionally graded arch subjected to mechanical and thermal loads are derived. In the analysis, it is assumed that the material properties of the arch vary through the thickness as a power function. As a numerical example, the critical buckling load and the corresponding mode shapes of a semicircle arch, with both of the ends fixed, subjected to normally uniform distributed follower force is obtained by the shooting method. The effects of the parameters of material gradient on the critical loads and the deformation of the structure are examined in detail. Equilibrium configurations for different values of the load or temperature rise are plotted. Analysis and numerical results show that the behavior of buckling of the arch is of bifurcation and the buckling modes corresponding to minimum buckling load is asymmetric. In other words, bifurcation buckling occurs prior to the snap-through buckling.

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Pi, Yong-Lin, e Mark Andrew Bradford. "Nonlinear elastic analysis and buckling of pinned–fixed arches". International Journal of Mechanical Sciences 68 (março de 2013): 212–23. http://dx.doi.org/10.1016/j.ijmecsci.2013.01.018.

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Cai, JianGuo, Jian Feng, Yao Chen e LiFeng Huang. "In-plane elastic stability of fixed parabolic shallow arches". Science in China Series E: Technological Sciences 52, n.º 3 (24 de fevereiro de 2009): 596–602. http://dx.doi.org/10.1007/s11431-009-0057-9.

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Albati, Mohammed, Riham Showlag, Alaa Akili, Halah Hanafiyyah, Hanadi AlNashri, Waad Aladwani, Ghaida Alfarsi, Mashael Alharbi e Abdulrahman Almutairi. "Space maintainers application, indication and complications". International Journal Of Community Medicine And Public Health 5, n.º 11 (25 de outubro de 2018): 4970. http://dx.doi.org/10.18203/2394-6040.ijcmph20184251.

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Dental space maintenance is essential in cases of premature loss of primary dentition to prevent malposition, supra-eruption, impaction, or crowding of the developing permanent teeth. Many types of space maintainers are available and each type is specifically designated for particular indications. Space maintainers have many classifications according to their design, their fixation pattern, their position, and their site. They can be fixed, semi-fixed, or removable, with or without loops, wires, and/or bands, unilateral or bilateral, and are placed on mandibular or maxillary arches. The most commonly used space maintainers are loops and bands, fixed lingual arches, Nance appliances, and transpalatal arches. Though space maintainers are generally safe, several complications are sometimes inevitable. This article will review the different types of space maintainers and their application and will discuss their indications and potential complications.

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Bradford, M. A., e Y. L. Pi. "Flexural–torsional buckling of fixed steel arches under uniform bending". Journal of Constructional Steel Research 62, n.º 1-2 (janeiro de 2006): 20–26. http://dx.doi.org/10.1016/j.jcsr.2005.02.012.

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Mais fontes

Teses / dissertações sobre o assunto "Fixed arches"

Mill, Andrew John. "Ultimate load analysis of fixed arches". Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25121.

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The advent of Limit States Design has created the necessity for a better understanding of how structures behave when loaded beyond first local yielding and up to collapse. Because the problem of determining the ultimate load capacity of structures is complicated by geometric and material non-linearity, a closed form solution for anything but the simplest of structure is not practical. With this as motivation, the ultimate capacity of fixed arches is examined in this thesis. The results are presented in the form of dimensionless collapse curves. The form of these curves is analogous to column capacity curves in that an ultimate load parameter will be plotted as a function of slenderness. The ultimate capacity of a structure is often determined by Plastic Collapse analysis or Elastic Buckling. Plastic Collapse is attained when sufficient plastic hinges form in a structure to create a mechanism. This analysis has been proven valid for moment resisting frames subjected to large amounts of bending and whose second order effects are minimal. Elastic buckling is defined when a second order structure stiffness matrix becomes singular or negative definite. Pure elastic buckling correctly predicts the ultimate load if all components of the structure remain elastic. This may occur in slender structures loaded to produce large axial forces and small amounts of bending. Because arches are subject to a considerable amount of both axial and bending, it is clear that a reasonable ultimate load analysis must include both plastic hinge formation and second order effects in order to evaluate all ranges of arch slenderness. A computer program available at the University of British Columbia accomplishes the task of combining second order analysis with plastic hinge formation. This ultimate load analysis program, called "ULA", is interactive, allowing the user to monitor the behaviour of the structure as the load level is increased to ultimate. A second order analysis is continually performed on the structure. Whenever the load level is sufficient to cause the formation of a plastic hinge, the stiffness matrix and load vector are altered to reflect this hinge formation, and a new structure is created. Instability occurs when a sufficient loss of stiffness brought on by the formation of hinges causes the determinant of the stiffness matrix to become zero or negative. Two different load cases were considered in this work. These are a point load and a uniformly distributed load. Both load cases included a dead load distributed over the entire span of the arch. The load, either point load or uniform load, at which collapse occurs is a function of several independent parameters. It is convenient to use the Buckingham π Theorem to reduce the number of parameters which govern the behaviour of the system. For both load cases, it was necessary to numerically vary the location or pattern of the loading to produce a minimum dimensionless load. Because of the multitude of parameters governing arch action it was not possible to describe all arches. Instead, the dimensionless behaviour of a standard arch was examined and the sensitivity of this standard to various parameter variations was given. Being three times redundant, a fixed arch plastic collapse mechanism requires four hinges. This indeed was the case at low L/r. However, at intermediate and high values of slenderness, the loss of stiffness due to the formation of fewer hinges than required for a plastic mechanism was sufficient to cause instability. As well, it was determined that pure elastic buckling rarely, if ever, governs the design of fixed arches. Finally, the collapse curves were applied to three existing arch bridges; one aluminum arch, one concrete arch, and one steel arch. The ultimate capacity tended to be between three and five times the service level live loads.
Applied Science, Faculty of
Civil Engineering, Department of
Graduate

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Liu, Xinpei Civil &amp Environmental Engineering Faculty of Engineering UNSW. "Nonlinear in-plane behaviour of fixed arches under thermal loading". Awarded by:University of New South Wales. School of Civil and Environmental Engineering, 2006. http://handle.unsw.edu.au/1959.4/27236.

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This thesis presents the nonlinear in-plane behaviour of circular fixed arches subjected to thermal loading only. Due to the nonlinear prebuckling behaviour of arches and its effects, classical buckling theory which is founded on geometric prebuckling linearity can not predict the in-plane buckling of arches accurately. Based on a nonlinear formulation of the strain and displacement relationship and considering constant thermal distributions only, virtual work formulations are used to establish the differential equations of in-plane equilibrium and the statical boundary conditions, from which the nonlinear equilibrium equations are derived in closed form and which are suitable to use in design. By considering the adjacent buckled configurations, the differential buckling equilibrium equations are formulated from the principle of virtual work as well, and the analytical solutions for the nonlinear buckling of fixed arches are obtained. It is shown that nonlinear elastic buckling of a fixed in the plane of it curvature can not occur when it is subjected to thermal loading only, except if the arch is as a straight column. By using the algebraic representation of nonlinear in-plane equilibrium derived in this thesis, the elastic response of fixed arches at elevated temperatures and the attainment of first yield are examined in detail. The arch deflects transversely without bound in the elastic range at elevated temperatures, whereas it will yield first at the top extreme fibre of the cross section at the supports when a critical temperature is reached. The influence of several parameters such as the included angle is also considered. Based on the models of stress distributions at cross sections, the spread of yield both through the cross section and along the length of the arch is studied. It is indicated that the progress of yielding causes the first two hinges to form at the supports of the fixed arches, and then moment redistribution leads to the generation of the third hinge at the crown with an increase of temperature. Thus nonlinear plastic hinge analysis can be applied to the arch analysis under thermal loading.

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Su, Po-Hua, e 蘇柏華. "Optimization of Cassette-Fixed Tool for Emergency Patient Radiographing Zygomatic Arches via Taguchi Methodology". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/17155048250515263211.

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碩士
中臺科技大學
醫學影像暨放射科學系暨研究所
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The Optimization of the cassette-fixed tool for emergency patient radiographing zygomatic arches via Taguchi analysis was accomplished in this work. Radiographers in dealing of the patients delivered from urgently surgical accidents were strongly recommended for not removing the cervical collar to suppress the secondary injury risk. Therefore, the conventional suggestion for acquiring optimal image quality of cervical vertebra became inappropriate in practical cases. A revised technique for fulfilling the critical case was proposed according to the Taguchi L8(27) analysis. Four factors were assigned herein to optimize the exposed X-ray image quality of the cervical vertebra for urgent trauma patients, (A) projected angle degree between cassette and table, (B) kVp (C) mAs of X-ray, (D) SID. The optimized result was (A) 60 degree (B) 80 kVp (C) 5.6 mAs (D) 85 cm SID and the dominant factor was A, the projected angle. To further verify the results, 60 urgent trauma patients were collected from 2013/05 to 2014/05. To further verify the optimized setting, the optimized images from the patients with cervical collar were compared to the regular patients without the cervical collar and exposed under the regular position. The average and the S/N is 4.38±0.27, 0.83dB and 4.36±0.25, 0.82dB, respectively. Furthermore, the retaking rate of the optimal setting also reduced to 5% indicating that the projection 60 degree is superior to 55 degree from clinical viewpoint. The patients with similar syndromes could have optimal X-ray exposed image quality from the auxiliary cassette-fix tool without causing hyperextension of cervical spine.

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Livros sobre o assunto "Fixed arches"

E, Hull Robert, Genealogical Association of Sacramento e Sacramento Archives and Museum Collection Center., eds. Sacramento County marriage licenses and certificates, 1861-1937: Licenses and certificates of marriage filed by the Sacramento County Recorder. [Sacramento, Calif.]: Genealogical Association of Sacramento, 1995.

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Butler, Lynn Edwards. Bach’s Report on Johann Scheibe’s Organ for St. Paul’s Church, Leipzig. University of Illinois Press, 2017. http://dx.doi.org/10.5406/illinois/9780252040191.003.0001.

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This chapter revisits Johann Sebastian Bach’s 1717 report on Johann Scheibe’s organ for St. Paul’s Church at the University of Leipzig. On December 16, 1717, Bach examined the organ “partly newly built and partly renovated” by Scheibe for St. Paul’s Church. Bach’s report, written the following day, is deemed successful by contemporary sources. Scheibe himself said the organ was “found [to be] free of even the smallest major defect,” to which the University agreed. However, Gottfried Silbermann’s early twentieth-century biographer Ernst Flade claimed that Scheibe’s organ was a mediocre instrument and suggested that Silbermann would have built a “masterpiece.” Subsequent writers emphasized what Flade labeled “Bach’s serious concerns” about Scheibe’s organ. Drawing on documents from the Leipzig University Archives, many of them written by Scheibe, this chapter shows that Bach enumerated in his report the organ’s problems that can be immediately fixed, problems about which nothing could be done, and problems likely to be encountered in the future; Bach also offered a vigorous defense of Scheibe.

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Capítulos de livros sobre o assunto "Fixed arches"

Vo, D., e P. Nanakorn. "Large Displacement Analysis of Pinned-Fixed Circular Arches with Different Rise-to-Span Ratios Using an Isogeometric Approach". In Lecture Notes in Civil Engineering, 951–60. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8079-6_89.

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Frey, Johannes, Denis Streitmatter, Fabian Götz, Sebastian Hellmann e Natanael Arndt. "DBpedia Archivo: A Web-Scale Interface for Ontology Archiving Under Consumer-Oriented Aspects". In Semantic Systems. In the Era of Knowledge Graphs, 19–35. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-59833-4_2.

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Abstract While thousands of ontologies exist on the web, a unified system for handling online ontologies – in particular with respect to discovery, versioning, access, quality-control, mappings – has not yet surfaced and users of ontologies struggle with many challenges. In this paper, we present an online ontology interface and augmented archive called DBpedia Archivo, that discovers, crawls, versions and archives ontologies on the DBpedia Databus. Based on this versioned crawl, different features, quality measures and, if possible, fixes are deployed to handle and stabilize the changes in the found ontologies at web-scale. A comparison to existing approaches and ontology repositories is given .

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Mahdi, Tariq. "Seismic Vulnerability of Arches, Vaults and Domes in Historical Buildings". In Civil and Environmental Engineering, 101–44. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-4666-9619-8.ch004.

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Arches, vaults and domes are common features in the cultures of old civilizations. They were usually made of sun-dried bricks, fired bricks or stones with different types of mortar. The majority of these components are vulnerable to seismic effects. Furthermore, the thrust actions transmitted by arches, vaults and domes to walls and piers usually cause damage to the supporting walls or piers. The present chapter discusses the structural behaviour and performance of these elements in past earthquakes and reviews the numerical models used for the seismic assessment of these elements. Furthermore, different damage assessment approaches are reviewed and suggestions are made on further research.

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Mahdi, Tariq. "Seismic Vulnerability of Arches, Vaults and Domes in Historical Buildings". In Handbook of Research on Seismic Assessment and Rehabilitation of Historic Structures, 401–47. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-8286-3.ch014.

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Fugini, Mariagrazia, Mirko Cesarini e Mario Mezzanzanica. "Analysis-Sensitive Conversion of Administrative Data into Statistical Information Systems". In Cases on Public Information Management and E-Government Adoption, 186–218. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-0981-5.ch008.

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This chapter presents a case study concerning the development of a Statistical Information System (SIS) out of data coming from administrative archives of the PAs. Such archives are a rich source of up to date information, but an attempt to use them as sources for statistical analysis reveals errors and incompatibilities among each other that do not permit their usage as a statistical and decision support basis. These errors and incompatibilities are usually undetected during administrative use, since they do not affect their day-by-day use in the PAs; however they need to be fixed before performing any further aggregate analysis. The reader is engaged with the basic aspects involved in building a SIS out of administrative data, such as design of an integration model for different and heterogeneous data sources, improvement of the overall data quality, removal of errors that might impact on the correctness of statistical analysis, design of a data warehouse for statistical analysis, and design of a multidimensional database to develop indicators for decision support. Finally, some examples are presented concerning the information that can be obtained by making use of a SIS constructed out of Registry and Income Office archives.

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Hunt, Arnold. "The Early Modern Secretary and the Early Modern Archive". In Archives and Information in the Early Modern World. British Academy, 2018. http://dx.doi.org/10.5871/bacad/9780197266250.003.0005.

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It was the secretary who handled the delivery of incoming letters, drafted and copied outgoing correspondence, filed papers for retention and, quite literally, held the keys to his master's secrets. This chapter reviews the current state of scholarship on the early modern secretary and asks what we can learn from the material traces that these invisible technicians left on the documents that passed through their hands. Secretaries sought to differentiate themselves from mere clerks by developing a more sophisticated range of techniques for the handling and retrieval of written documents, and the rise of the secretary as a distinct profession was therefore accompanied by the emergence of a new technology of the archive.

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Wagner, Delphine, Yves Remond, Yves Bolender, Pascal Laheurte e Daniel George. "Mechanical Characterization of Orthodontic Archwires in a Pseudo In-Vivo Context". In Stem Cells and Regenerative Medicine. IOS Press, 2021. http://dx.doi.org/10.3233/bhr210012.

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Orthodontic fixed appliances are used to correct dental malocclusions by optimizing tooth movement and associated bone remodelling. Currently, orthodontic archwires made of shape memory alloys (SMAs) are widely used to initiate these treatments. We conduct experiments on SMA wires in pseudo in-vivo conditions, complementary to ISO standards, to assess the influence of temperature and humidity and to highlight their expected mechanical behaviour for clinical use. For this, an in-house built measurement device was developed to carry out experiments at controlled temperatures (21°C and 35°C) and in dry or wet conditions (artificial saliva). The dental arch was reproduced by 3D printing. The results show that the temperature has a major influence on the delivered forces whereas wet or dry conditions seem to have less impact. Also, we emphasize that at 35°C (in mouth conditions), in wet or dry conditions, SMAs superelasticity is only effective for displacements up to about 3 mm when an entire dental arch is considered.

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Furtado, Gustavo Procopio. "Epilogue". In Documentary Filmmaking in Contemporary Brazil, 203–8. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190867041.003.0008.

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This epilogue briefly discusses the interconnections between the three parts of the book and considers additional examples of recent films that deal with contemporary issues of social justice and post-dictatorship memory while maintaining an engagement with questions of the archive. As this book has explored in several contexts, Brazilian documentaries engage critically with archives while performing archival functions of their own—producing records of what would otherwise be lost and incorporating fragments of the present and the past that are preserved for the future. At the same time, films can be the vehicle for the de-archivization of documents and materials that are unearthed from unseen records and placed into public circulation as well as given new futures through their filmic inclusion. Functioning in liminal and transitional terrains, the documentary’s interaction with concepts of the archive and archival materials allows it to reflect on and intervene in the distribution of visibilities and invisibilities, centers and margins, silences and speech, forms of authority and forms of resistance, living memory and its preservation in fixed forms.

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Cohen-Levy, DDS, Julia. "Orthodontic Monitoring and Case Finishing With the T-Scan System". In Advances in Medical Technologies and Clinical Practice, 1057–124. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-5225-9254-9.ch015.

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This chapter reviews T-Scan use in orthodontics from diagnosis to case finishing, and then in retention, while defining normal T-Scan recording parameters for orthodontically-treated subjects versus untreated subjects. T-Scan use in the case-finishing process is also described, which compensates for changes in the occlusion that occur during “post-orthodontic settling,” as teeth move freely within the periodontium to find an equilibrium position when the orthodontic appliances have been removed. T-Scan implementation is necessary because, often, despite there being a post treatment, visually “perfect” angle's Class I relationship established with the orthodontic treatment, ideal occlusal contacts do not result solely from tooth movement. Creating simultaneous and equal force occlusal contacts following fixed appliance removal can be accomplished using T-Scan data to optimize the end-result occlusal contact pattern. The T-Scan software's force distribution and timing indicators (the two- and three-dimensional force views, force percentage per tooth and arch half, the center of force trajectory and icon, the occlusion time [OT], and the disclusion time [DT]), all aid the Orthodontist in obtaining an ideal occlusal force distribution during case-finishing. Fortunately, most orthodontic cases remain asymptomatic during and after tooth movement. However, an occlusal force imbalance or patient discomfort may occur along with the malocclusion that needs orthodontic treatment. Symptomatic cases require special documentation at the baseline, and careful monitoring throughout the entire orthodontic process. The clinical use of T-Scan in these “fragile” cases of patient muscle in-coordination, mandibular deviation, atypical pain, and/or TMJ idiopathic arthritis, are illustrated by several case reports. The presented clinical examples highlight combining T-Scan data recorded during case diagnosis, tooth movement, and in case finishing, with patients that underwent lingual orthodontics and orthognathic surgery, orthodontic treatment using clear aligners, or conventional fixed treatment with a camouflage treatment plan, which require special occlusal finishing (when premolars are extracted in only one arch).

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Cohen-Levy, DDS, MS, PhD, Julia. "Orthodontic T-Scan Applications". In Handbook of Research on Computerized Occlusal Analysis Technology Applications in Dental Medicine, 523–61. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-6587-3.ch011.

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This chapter reviews T-Scan use in Orthodontics, defines normal T-Scan recordings for orthodontically treated subjects versus untreated subjects, and explains T-Scan use in the case-finishing process. After orthodontic appliance removal changes in the occlusion result from “settling,” because teeth can move freely within the periodontium. Despite a post treatment, visually “perfect” Angle's Class I relationship, ideal occlusal contacts often do not result solely from tooth movement. Creating simultaneous and equal contacts following fixed appliance removal can be accomplished using T-Scan data to optimize the end-result occlusal contact pattern. The software's force distribution and timing indicators (the 2 and 3-Dimensional ForceViews, force percentage per tooth and arch half, the Center of Force, and the Occlusion and Disclusion Times) aid in obtaining an ideal occlusal force distribution during case-finishing. Several case reports highlight combining lingual orthodontic treatment with Orthognathic surgery, where each presented case utilized T-Scan data during active treatment and retention.

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Trabalhos de conferências sobre o assunto "Fixed arches"

Dou, Chao, Yan-Lin Guo e Si-Yuan Zhao. "Out-of-Plane Elastic Buckling Load of Fixed Circular Arches in Uniform Compression". In 10th Pacific Structural Steel Conference (PSSC 2013). Singapore: Research Publishing Services, 2013. http://dx.doi.org/10.3850/978-981-07-7137-9_029.

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Toczkiewicz, Robert, Jan Biliszczuk e Marco Teichgraeber. "Large Bridges Recently Built in Poland". In IABSE Conference, Kuala Lumpur 2018: Engineering the Developing World. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2018. http://dx.doi.org/10.2749/kualalumpur.2018.0889.

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The road and railway infrastructure in Poland has been intensively developed and modernized for the last years. Around 300 new bridges are built annually. Among the new structures there is a group of modern long span bridges. This paper presents examples of selected, most interesting large road bridges built in recent years in Poland. The following structures are described:<ul><li> two largest extradosed bridges in Europe – with spans exceeding 200 m;</li><li> the largest arch bridge in Poland with 270 m long fixed arches and an expressway bridge with 200 m long arch span;</li><li> two cable-stayed bridges. Structural configuration and construction technology of the above mentioned bridges are described.

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van Swaaij, W. P. M. "HEAT AND MASS TRANSFER IN FIXED AND FLUIDIZED BEDS. International Symposium 1984". In Archives of Heat Transfer. Washington: Hemisphere, 1988. http://dx.doi.org/10.1615/ichmt.1988.20thaht.330.

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van Swaaij, W. P. M. "HEAT AND MASS TRANSFER IN FIXED AND FLUIDIZED BEDS. International Symposium 1984". In Archives of Heat Transfer. Connecticut: Begellhouse, 1988. http://dx.doi.org/10.1615/ichmt.1988.aht.330.

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Murray, John J., Harish Mukundan, Apurva Gupta e Guibog Choi. "Dry Disconnectable Riser System for Low Keel Clearance Floaters". In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79734.

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Fixed structures operating in extreme offshore environments (eg: arctic) have to resist and survive the challenging conditions like large ice forces. On the other hand, the floating systems in such environments benefit from their ability to be evacuated and transported in the event of severe condition. However, such an ice-management scheme requires the moorings and risers to be disconnected in the severe conditions and reconnected during more clement conditions. Among the floater designs typically considered for extreme offshore applications is the Spar. The Spar offers low extreme motion responses than other shallower draft floaters and as a result, low fatigue damage on the risers. However, this design has versions with open centerwells that can contain leaked product and cause a potential hazardous condition. Furthermore, most designs that require the risers to be disconnected below the mean water line (wet-disconnection mechanism) not only carry the risk of leakage but have poor access for visual inspection. One solution is to use a continuous flexible riser without in-line connections or terminations in the flexible riser between the seafloor pipe line end manifolds (PLEM) and the production deck manifolds (dry-disconnection mechanism). The risers disconnect at an elevation above the water line and the termination point is lowered to a disconnect buoy supported at the keel. Subsequently the floater is moved away. The main difficulty is that the lowered flexible riser has to be suspended from the disconnect buoy and at the same time avoid contact with the seafloor. This paper describes and discusses a design of a dry-disconnectable flexible riser system comprised of a buoy supporting arches to control the bending in the risers during operation and disconnect. The system is particularly effective when the clearance between the keel and the seafloor is restricted. The rationale is based on strength, control of the minimum allowable bend radius and interference among the risers.

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Schaub, R. G., e F. P. Bell. "LIPID ACCUMULATION AND METABOLISM IN CARRAGEENAN-INDUCED GRANULOMAS COMPARED TO BLOOD MONOCYTES AND THE AORTA". In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643410.

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Arteries undergoing atherogenic change show an increase in cholesteryl esterifying activity by acylCoA:cholesterol acetyl-transferase (ACAT) and a progressive accumulation of cholesterol esters within monocyte derived foam cells. The study of these factors, however, is limited by the necessity of obtaining artery tissues for analysis. In this study, an in vivo model (Am J Path 118:134 and 120:391, 1985) which permits the analysis of foam cell development without requiring collection of aortas was examined in more detail. New Zealand rabbits (6 each) were either maintained on a 1% cholesterol/peanut oil diet (HD) or a regular chow diet (RD) for 2 weeks after which each had 15 ml of a 1% carra-geenan gel (Marine Colloids) injected subcutaneously into the mid-abdominal area. The rabbits were maintained on their respective diets for an additional 4 weeks. At sacrifice, blood was collected for both serum and monocyte isolation. Granulomas and aortic arches were also excised. Tissues were assayed for lipid accumulation and metabolism. Electron and light microscopy was also performed on immersion fixed (1% glutaraldehyde) granuloma tissue. Granulomas of HD rabbits were pale yellow and averaged 36 grams, while RD granulomas were a pale red and averaged 11 grams (p less than 0.05). RD granulomas did not stain with oil red 0. HD granulomas had homogenous oil red 0 staining which indicated lipid accumulation. Both RD and HD granulomas had large numbers of macrophages. RD macrophages accumulated follicular carrageenan, but not lipid. In HD granulomas, foam cell development was observed. Granuloma lipid content and metabolism paralleled the aorta and blood monocytes. The HD tissue had increased ACAT activity and lipid composition changes indicative of atherosclerosis. RD granulomas had no elevation of lipid content or ACAT activity. The results suggest that the carrageenan-induced granulomas provides a useful model for studying the biochemical and morphologic changes characteristic of aortic monocyte-derived foam cells and the early arterial atherosclerotic process.

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Jorgensen, Kris L., Joseph R. Strempek, William J. Arvan e Raymond H. Schauer. "Use of Numerical Modeling to Compare Over-Fire Air Systems on Stoker-Fired Furnaces". In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68348.

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The method by which air is introduced to a furnace is an important aspect of the combustion system. With the demands of more stringent regulations affecting modern combustion systems, numerical modeling has become a valuable tool for design and analysis. Numerical modeling has been used to compare a conventional Controlled Combustion Zone (CCZ™) overfire air system design typically used on stoker-fired furnaces to a more advanced design. The new design involves removing the opposed arches and replacing the numerous small overfire air ports with a smaller number of controlled penetration Precision Jet™ ports. Modeling results demonstrate benefits of the advanced design.

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CANN, G., e T. PUGMIRE. "Design of multikilowatt arcjets with high voltage, fixed length, swirl controlled arc discharges". In 22nd Joint Propulsion Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1986. http://dx.doi.org/10.2514/6.1986-1509.

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Jorquera-Lucerga, Juan José, e Juan Manuel GARCÍA-GUERRERO. "Stiffened Hangers: an Often Overlooked Tool for Conceptual Design of Tied-Arch Footbridges". In Footbridge 2022 (Madrid): Creating Experience. Madrid, Spain: Asociación Española de Ingeniería Estructural, 2021. http://dx.doi.org/10.24904/footbridge2022.049.

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In tied-arch bridges, the way the arch and the deck are connected may become crucial. The deck is usually suspended from hangers made out of steel pinned cables capable of resisting axial forces only. However, a proper structural response, (both in-plane and out-of-plane) may be ensured by fixing and stiffening the hangers in order to resist, additionally, shear forces and bending moments. This paper studies the effect of different pinned and stiffened hanger arrangements on the structural behavior of the tied-arch footbridges, with the intention of providing designers with useful tools at the early steps of design. As a major conclusion, regarding the in-plane behavior, hangers composed of cables (either with vertical, Nielsen-Löhse or network arrangements) are recommended due to its low cost and ease of erection. Alternatively, longitudinally stiffened hangers, fixed at both ends, can be used. Regarding the out-of-plane behavior, and in addition to three-dimensional arrangements of cables, of limited effectiveness, transversally stiffened hangers fixed at both ends are the most efficient arrangement. A configuration almost as efficient can be achieved by locating a hinge at the end corresponding to the most flexible structural element (normally the arch). Its efficiency is further improved if the cross-section tapers from the fixed end to the pinned end.

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Labanca, Edson L., Elton J. B. Ribeiro, Cipriano J. Medeiros, José A. N. Ferreira, Victor P. Gomes, Renato D. C. Amaral, Oscar J. P. R. Mejia, Leandro P. Basilio e Celso C. Noronha Neto. "Viability of Fixed Riser Support Structures for Lazy S Riser Configuration in Shallow Waters". In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24666.

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When in shallow waters, not only the risers, but also the structures and equipment are submitted to different conditions from the ones related to deepwater applications. OGX has developed offshore applications in shallow waters in Campos Basin, Brazil, using a FPSO with Lazy S riser configuration, based on the Midwater Arch systems (MWA). MWA systems are feasible due to OGX application scenario, but they present some disadvantages, such as: high compliance of the buoyant section to the FPSO, large static offset (common issue in shallow waters applications), which makes the MWA carry the risers that are clamped at the top; high manufacturing and installation costs, associated to the high weight of the structure, which includes large and heavy buoys; limitation regarding transportation, sometimes requiring heavy duty trucks, and consequently, more expensive ones. These disadvantages could be avoided by using another type of support structure, but it depends on the application conditions. Aiming to optimize the Lazy S configuration for new applications in shallow waters, a viability study of a most simplified concept of support, fixed and less compliant, was carried out considering as a standard scenario the Waimea field (under development), located in Campos Basin, Brazil. As a result of this study, OGX and Wood Group Kenny developed the conceptual project of an innovative design of Riser Support Structure (RSS). Therefore, this paper addresses the technical challenges that were faced during the design of this new concept of Riser Support Structure for shallow waters in offshore applications, including issues regarding the required structural safe response and aspects comprising installation and some decommissioning considerations. Regarding the design, this paper discusses the structural analyses performed to validate the RSS, which include VIV and Finite Element Analyses, presenting its main results, and the critical issues encountered during these analyses. They include issues such as: Overstress due to combined loads; stress concentration in important structural components; and stress concentration due to impact load (issue recognized during dynamic analysis to simulate the pile driving operation).

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