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Relevant bibliographies by topics / Longitudinal

Academic literature on the topic 'Longitudinal'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 July 2024

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Journal articles on the topic "Longitudinal"

1

Gera, B., M. Sitarz, and Ya Bolzhelarskyi. "Longitudinal vibrations of viscoelastic longitudinally nonuniform rod under power load distributed along its length." Mathematical Modeling and Computing 3, no. 2 (December 31, 2016): 135–45. http://dx.doi.org/10.23939/mmc2016.02.135.

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Campbell, Richard T., Elizabeth Mutran, and Robert Nash Parker. "Longitudinal Design and Longitudinal Analysis." Research on Aging 8, no. 4 (December 1986): 480–502. http://dx.doi.org/10.1177/0164027586008004003.

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Kotzian, Bruno, Ives Cavalcante Passos, and Flávio Kapczinski. "Longitudinal course of bipolar disorder." Revista Debates em Psiquiatria Ano 6 (October 1, 2016): 6–8. http://dx.doi.org/10.25118/2236-918x-6-5-1.

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Gerdes, B., H. H. Köhler, B. Stinner, P. J. Barth, I. Celik, and M. Rothmund. "Der longitudinale Muskel des Analkanals The anal longitudinal muscle." Der Chirurg 68, no. 12 (December 1997): 1281–85. http://dx.doi.org/10.1007/s001040050360.

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Yang, Keming. "Longitudinal Loneliness and Its Risk Factors among Older People in England." Canadian Journal on Aging / La Revue canadienne du vieillissement 37, no. 1 (January 2, 2018): 12–21. http://dx.doi.org/10.1017/s0714980817000526.

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RÉSUMÉCet article présente les trajectoires longitudinales de la solitude associée au vieillissement et modélise les impacts de ses différents facteurs de risques. Les données proviennent des vagues 2 à 6 (2004/5 – 2012/13) de l’Étude longitudinale anglaise sur le vieillissement de la population (English Longitudinal Studies of Ageing; ELSA). Les répondants ayant participé à au moins deux vagues qui ont répondu de manière valide à l’Échelle de solitude de la UCLA (UCLA three-item loneliness scale) ont été inclus dans l’étude (ligne de base : n = 9171). Bien que les statistiques décrivant les changements entre les vagues confirment la stabilité de la solitude dans une optique longitudinale chez les personnes âgées, une attention particulière devrait être portée à la proportion restreinte de personnes âgées qui se retrouvent dans une « solitude longitudinale ». L’état de santé autodéclaré et les relations avec l’époux et les enfants faisaient partie des facteurs de risques significatifs; aussi, les changements dans le lien de proximité avec l’époux affectaient davantage le score de solitude que la perte de l’époux. D’autres recherches devront être menées afin d’identifier les événements personnels et sociaux qui accroissent la solitude des personnes âgées sur le long terme.

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Leach, Michael J. "Longitudinal." Medical Journal of Australia 203, no. 7 (October 2015): 307. http://dx.doi.org/10.5694/mja15.00555.

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Gudra, Tadeusz, Lukasz Palasz, and Krzysztof J. Opielinski. "Ultrasonic transducers with directional converters of vibration of longitudinal-longitudinal type and longitudinal-longitudinal-longitudinal type intended to work in gaseous media." Journal of the Acoustical Society of America 133, no. 5 (May 2013): 3600. http://dx.doi.org/10.1121/1.4806670.

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Sobel, E., S. Levitz, R. Cohen, R. Giorgini, and KT Jules. "Longitudinal epiphyseal bracket: associated foot deformities with implications for treatment." Journal of the American Podiatric Medical Association 86, no. 4 (April 1, 1996): 147–55. http://dx.doi.org/10.7547/87507315-86-4-147.

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The longitudinal epiphyseal bracket is a rare ossification defect of bones of the hands and feet and results in an abnormal epiphysis that is C-shaped, longitudinally oriented, and vertically extends into the diaphysis. The longitudinal epiphyseal bracket may exist as an isolated deformity, but is commonly associated with digital deformities such as polydactyly, duplicated digits, congenital hallux varus, and clinodactyly. Five case histories of children with the longitudinal epiphyseal bracket in different bones of the foot are described with three distinct clinical presentations. The development of the longitudinal epiphyseal bracket and implications for treatment are considered.

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Stewart, S. F. C., and D. J. Lyman. "Finite Elasticity Modeling of the Biaxial and Uniaxial Properties of Compliant Vascular Grafts." Journal of Biomechanical Engineering 110, no. 4 (November 1, 1988): 344–48. http://dx.doi.org/10.1115/1.3108451.

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Compliant vascular grafts were modeled by finite elasticity theory. A linear, biaxial model satisfactorily described the stress-strain behavior in inflation tests, where the sample length was fixed longitudinally and inflated. The model was then used to predict the behavior in a longitudinal test (where the longitudinal stretch was varied while keeping the pressure zero), and in a uniaxial test of a circumferential strip. The model satisfactorily predicted the longitudinal Young’s modulus measured in the longitudinal test. The model was less successful in predicting the circumferential Young’s modulus measured in the uniaxial test, possibly because the state of stress was not purely uniaxial.

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Havens, Betty. "Overview of Longitudinal Research on Aging." Canadian Journal on Aging / La Revue canadienne du vieillissement 14, S1 (1995): 119–34. http://dx.doi.org/10.1017/s0714980800005468.

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RÉSUMÉCet article est une courte introduction sur les méthodes de recherche et l'analyse des données longitudinales en gérontologie. On y présente les questions de recherche gérontologique qui exigent une étude longitudinale et démontre que l'utilisation de l'analyse de données secondaires est sur le point de devenir essentielle pour ces études. Ces analyses fournissent la possibilité de maximiser tant les stratégies de recherche longitudinale que les possibilités de recherche. L'importance d'une stabilité administrative et financière en vue de maintenir les bases de données pour les recherches longitudinales est mise en lumière à l'aide d'exemples. L'article comprend également un compte rendu des principales études longitudinales canadiennes sur le vieillissement et de certaines études entreprises à l'étranger. Finalement, on cite bon nombre de sources de données quantitatives et qualitatives.

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Dissertations / Theses on the topic "Longitudinal"

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Petzold, Max. "Evaluation of information in longitudinal data." Göteborg : Statistical Research Unit, Göteborg University, 2003. http://catalog.hathitrust.org/api/volumes/oclc/52551306.html.

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Arnal, Mathieu. "Développement d'une évaluation génomique pour l'analyse de données longitudinales : application aux contrôles élémentaires chez les caprins laitiers." Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0124.

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L’amélioration génétique des caprins laitiers est basée, à ce jour, sur la mesure de la quantité et de la qualité de la production laitière des femelles en ferme, à intervalles de 4 à 5 semaines au cours de la lactation, selon des protocoles stricts. L’évaluation génétique de la quantité de lait repose sur l’estimation de la quantité de lait totale produite par lactation. Cette sélection à partir de la quantité totale de lait à la lactation a tendance à sélectionner des animaux avec une production au pic de lactation de plus en plus élevée. Une production importante en début de lactation peut être à l’origine, pour les femelles, de problèmes métaboliques. De plus, en caprins laitiers, dans un contexte de production saisonnée, une production laitière qui se maintient après le pic, i.e. persistante, permettrait une production laitière plus étalée, en lien avec les attentes du marché. Il y a donc un intérêt zootechnique et économique de vouloir sélectionner des chèvres laitières plus persistantes. Dans notre étude, l’approche consiste à modéliser la forme de la courbe de lactation à partir des informations recueillies lors de chaque contrôle en ferme. Les modèles permettant l’analyse de telles données longitudinales sont généralement appelés modèles de contrôles élémentaires. L’un des principaux intérêts, est une meilleure prise en compte d’effets d’environnement, affectant la production le jour du contrôle, avec un effet troupeau-jour de contrôle ne dépendant que des animaux présents lors du contrôle. Le deuxième avantage de ce type de modèle réside dans la modélisation de la plupart des effets génétiques et d’environnement sous forme de courbes ; il serait donc possible de sélectionner les animaux avec la meilleure valeur génétique pour la persistance. La mise au point de ces modèles nécessite l’étude préalable des effets d’environnement affectant la production laitière au cours du temps. Suite à une analyse descriptive détaillée des courbes de lactation des deux principales races caprines françaises (Alpine et Saanen), nous avons montré qu’il existait une variabilité de la forme de courbes de lactation, et en particulier que le mois de mise bas était impliqué dans les différentes formes de courbe. Nous avons ensuite proposé un modèle de régression aléatoire, proche de celui développé chez les bovins laitiers français. La modélisation proposée permet d’obtenir directement deux index génétiques : un premier correspondant à la valeur génétique de l’animal pour la quantité totale de lait au cours de la lactation et un deuxième correspondant à une valeur génétique de la persistance laitière de l’animal, et cela sans corrélation entre les deux. Le modèle développé permet de prendre en compte de façon disjointe les chèvres en primipares et les chèvres en multipares. Nous avons également étudié les corrélations entre index de différents caractères, au cours de la lactation ainsi que les corrélations entre persistance et fertilité à l’IA ou entre persistance et longévité. Dans une dernière partie, nous avons étendu le modèle d’évaluation génétique des contrôles élémentaires à un modèle d’évaluation génomique (Singlestep GBLUP) permettant d’exploiter l’ensemble des informations moléculaires disponibles (génotypages SNP 50K). Une validation de ce modèle et une comparaison au modèle actuel ont été réalisées. Les différences de moyennes des index estimés par année de naissance des boucs constituaient la principale différence entre le modèle Single-step GBLUP RRM et le Single-step GBLUP modèle à la lactation utilisé actuellement. Enfin, à partir du modèle Single-step GBLUP nous avons mis en évidence quelques régions du génome intéressantes liées à la persistance laitière
Genetic improvement of dairy goats is based on the measurement of the quantity and quality of milk production of females on farms, at intervals of 4 to 5 weeks during lactation, according to strict protocols. The genetic evaluation of the quantity of milk is based on the estimation of the total quantity of milk produced per lactation. This selection based on the total quantity of milk in lactation tends to select animals with increasingly high peak lactation production. High production at the beginning of lactation can cause metabolic problems for females. In addition, in the case of dairy goats, in a context of seasonal production, a milk production that is maintained after the peak, i.e. persistent, would allow a more spread out milk production, in line with market expectations. There is therefore a zootechnical and economic interest in wanting to select more persistent dairy goats. In our study, the approach consists in modelling the shape of the lactation curve based on the information collected during each farm test. Models allowing the analysis of such longitudinal data are generally called test-day models. One of the main interests is to take better account of environmental effects, affecting production on test-day, with a herd-test-day effect depending only on the animals present during the test. The second advantage of this type of model is that most genetic and environmental effects are modelled as curves, so it would be possible to select animals with the best genetic value for persistence. The development of these models requires the prior study of the environmental effects affecting milk production over time. Following a detailed descriptive analysis of the lactation curves of the two main French goat breeds (Alpine and Saanen), we showed that there was a variability in the shape of the lactation curves, and in particular the month of calving was involved in the different curve shapes. Then we proposed a random regression model, similar to that developed in French dairy cattle. The proposed modeling makes it possible to obtain two genetic indexes directly: one corresponding to the genetic value of the animal for the total quantity of milk during lactation and a second corresponding to a genetic value of the animal's milk persistency, without correlation between the two. The model proposed is more relevant than the current one because it takes into account, in a disjointed way, the goats in primiparous and the goats in multiparous. We also studied correlations between indexes of different traits during lactation and correlations between persistence and AI fertility or between persistence and longevity. In the last part of the thesis, we extended the genetic evaluation of test-day to a genomic evaluation model (Single-step GBLUP) allowing to exploit all available molecular information (genotyping SNP 50K). A validation of this model and a comparison with the current model was carried out. The main difference between the Single-step GBLUP RRM and the Single-step GBLUP lactation model currently in use was the differences in the averages of the estimated indexes per year of birth of the bucks. Finally, from the Single-step GBLUP model we have identified some interested regions of the genome linked to milk persistence

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Metzger, Nikolaus K. "Longitudinal optical binding." Thesis, St Andrews, 2008. http://hdl.handle.net/10023/519.

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Lin, Ying-Tsair. "Ship longitudinal strength modelling." Thesis, University of Glasgow, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320513.

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Moroder, Daniel. "Longitudinal bar buckling behavior." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amslaurea.unibo.it/94/.

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Reinforced concrete columns might fail because of buckling of the longitudinal reinforcing bar when exposed to earthquake motions. Depending on the hoop stiffness and the length-over-diameter ratio, the instability can be local (in between two subsequent hoops) or global (the buckling length comprises several hoop spacings). To get insight into the topic, an extensive literary research of 19 existing models has been carried out including different approaches and assumptions which yield different results. Finite element fiberanalysis was carried out to study the local buckling behavior with varying length-over-diameter and initial imperfection-over-diameter ratios. The comparison of the analytical results with some experimental results shows good agreement before the post buckling behavior undergoes large deformation. Furthermore, different global buckling analysis cases were run considering the influence of different parameters; for certain hoop stiffnesses and length-over-diameter ratios local buckling was encountered. A parametric study yields an adimensional critical stress in function of a stiffness ratio characterized by the reinforcement configuration. Colonne in cemento armato possono collassare per via dell’instabilità dell’armatura longitudinale se sottoposte all’azione di un sisma. In funzione della rigidezza dei ferri trasversali e del rapporto lunghezza d’inflessione-diametro, l’instabilità può essere locale (fra due staffe adiacenti) o globale (la lunghezza d’instabilità comprende alcune staffe). Per introdurre alla materia, è proposta un’esauriente ricerca bibliografica di 19 modelli esistenti che include approcci e ipotesi differenti che portano a risultati distinti. Tramite un’analisi a fibre e elementi finiti si è studiata l’instabilità locale con vari rapporti lunghezza d’inflessione-diametro e imperfezione iniziale-diametro. Il confronto dei risultati analitici con quelli sperimentali mostra una buona coincidenza fino al raggiungimento di grandi spostamenti. Inoltre, il caso d’instabilità globale è stato simulato valutando l’influenza di vari parametri; per certe configurazioni di rigidezza delle staffe e lunghezza d’inflessione-diametro si hanno ottenuto casi di instabilità locale. Uno studio parametrico ha permesso di ottenere un carico critico adimensionale in funzione del rapporto di rigidezza dato dalle caratteristiche dell’armatura.

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Ettinger, Ronald L. "Overdentures : a longitudinal perspective." Thesis, The University of Sydney, 1992. http://hdl.handle.net/2123/4645.

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Mandele, L. Martin van der. "Leadership and the inflection point : a longitudinal perspective = Leiderschap en het inflectiepunt : een longitudinaal perspectief /." Rotterdam : Erasmus Research Institute of Management, 2004. http://hdl.handle.net/1765/1302.

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Sieber, Jan. "Longitudinal dynamics of semiconductor lasers." Doctoral thesis, [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963267795.

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Husain, Syeda Tasmine. "Bayesian analysis of longitudinal models /." Internet access available to MUN users only, 2003. http://collections.mun.ca/u?/theses,163598.

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Ju, Hyunsu. "Topics in analyzing longitudinal data." Texas A&M University, 2004. http://hdl.handle.net/1969.1/1565.

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We propose methods for analyzing longitudinal data, obtained in clinical trials and other applications with repeated measures of responses taken over time. Common characteristics of longitudinal studies are correlated responses and observations taken at unequal points in time. The first part of this dissertation examines the justification of a block bootstrap procedure for the repeated measurement designs, which takes into account the dependence structure of the data by resampling blocks of adjacent observations rather than individual data points. In the case of dependent stationary data, under regular conditions, the approximately studentized or standardized block bootstrap possesses a higher order of accuracy. With longitudinal data, the second part of this dissertation shows that the diagonal optimal weights for unbalanced designs can be made to improve the efficiency of the estimators in terms of mean squared error criterion. Simulation study is conducted for each of the longitudinal designs. We will also analyze repeated measurement data set concerning nursing home residents with multiple sclerosis, which is obtained from a large database termed the minimum data set (MDS).

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Books on the topic "Longitudinal"

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Menard, Scott. Longitudinal research. Newbury Park, CA: Sage Publications, 1991.

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Rösch, T., U. Will, and K. J. Chang, eds. Longitudinal Endosonography. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59516-5.

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Menard, Scott. Longitudinal Research. 2455 Teller Road, Thousand Oaks California 91320 United States of America: SAGE Publications, Inc., 2002. http://dx.doi.org/10.4135/9781412984867.

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Menard, Scott W. Longitudinal research. Newbury Park, Calif: Sage Publications, 1991.

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Introduction to longitudinal research. London: Routledge, 2002.

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Northwest Regional Educational Laboratory. Child, Family and Community Program. and Washington (State). Early Childhood Education and Assistance Program., eds. Longitudinal study: ECEAP 1991 longitudinal study and annual report. Olympia, Wash: Washington State's Early Childhood Education and Assistance Program, 1992.

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Ferrer, Emilio, Steven M. Boker, and Kevin J. Grimm, eds. Longitudinal Multivariate Psychology. New York, NY : Routledge, 2019. | Series: Multivariate applications series |: Routledge, 2018. http://dx.doi.org/10.4324/9781315160542.

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Kibler, Amanda K. Longitudinal Interactional Histories. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-98815-3.

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Donald, Hedeker, and Gibbons Robert D. Longitudinal Data Analysis. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2006. http://dx.doi.org/10.1002/0470036486.

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Funatogawa, Ikuko, and Takashi Funatogawa. Longitudinal Data Analysis. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-0077-5.

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Book chapters on the topic "Longitudinal"

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Lewis, Moira, Courtenay Norbury, Rhiannon Luyster, Lauren Schmitt, Andrea McDuffie, Eileen Haebig, Donna S. Murray, et al. "Longitudinal." In Encyclopedia of Autism Spectrum Disorders, 1758. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4419-1698-3_100828.

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Plies, W., and M. Stief. "Basic Principles and Technology." In Longitudinal Endosonography, 3–8. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59516-5_1.

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Burmester, E., C. Jakobeit, L. Welp, J. Janssen, L. Greiner, P. Kann, H. Seifert, P. Vilmann, and U. Will. "Pancreas." In Longitudinal Endosonography, 89–100. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59516-5_10.

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Burmester, E., C. Jakobeit, L. Welp, J. Janssen, L. Greiner, P. Vilmann, and U. Will. "Biliary Tract." In Longitudinal Endosonography, 101–4. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59516-5_11.

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Burmester, E., C. Jakobeit, P. Vilmann, and U. Will. "Papilla of Vater." In Longitudinal Endosonography, 105–8. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59516-5_12.

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Burmester, E., C. Jakobeit, L. Welp, P. Vilmann, U. Will, and M. Wittenberg. "Vessels." In Longitudinal Endosonography, 109–13. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59516-5_13.

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Erk, J. U., P. Kann, U. Will, and M. Wittenberg. "Adrenal Glands." In Longitudinal Endosonography, 115–17. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59516-5_14.

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Jakobeit, C., L. Welp, J. Janssen, L. Greiner, P. Vilmann, U. Will, and M. Wittenberg. "Miscellaneous Findings." In Longitudinal Endosonography, 119–21. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59516-5_15.

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Vilmann, P., and G. K. Jacobsen. "Indications." In Longitudinal Endosonography, 125–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59516-5_16.

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Vilmann, P., and G. K. Jacobsen. "EUS-FNA Technique." In Longitudinal Endosonography, 139–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59516-5_17.

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Conference papers on the topic "Longitudinal"

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Xu, Tingyang, Jiangwen Sun, and Jinbo Bi. "Longitudinal LASSO." In KDD '15: The 21th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining. New York, NY, USA: ACM, 2015. http://dx.doi.org/10.1145/2783258.2783403.

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Gudra, Tadeusz, Lukasz P. Palasz, and Krzysztof J. Opielinski. "Ultrasonic transducers with directional converters of vibration of longitudinal-longitudinal (L-L) type and longitudinal-longitudinal-longitudinal (L-L-L) type intended to work in gaseous media." In ICA 2013 Montreal. ASA, 2013. http://dx.doi.org/10.1121/1.4799695.

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Koo, Shiang-Lung, Han-Shue Tan, and Masayoshi Tomizuka. "Analysis of Vehicle Longitudinal Dynamics for Longitudinal Ride Comfort." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15161.

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Longitudinal ride comfort is one of the most crucial features to most advanced vehicle control systems. Literature review shows that the ride comfort analysis in vehicle longitudinal motion can be divided into two categories: time domain and frequency domain. Most vehicle longitudinal control designs incorporate jerk and acceleration constraints from the time-domain comfort criterion. However, the vehicle longitudinal characteristics in the frequency range important to passenger ride comfort are rarely discussed in the vehicle control literature. This paper proposes an improved vehicle longitudinal model that captures tire and suspension modes accurately and investigates the impact of these often-ignored vehicle resonant modes to ride comfort. This study shows that the "tire-mode switching behavior" affects longitudinal ride comfort of a stopping vehicle rather than the suspension. A passenger car was tested as an example, and the collected data verified the analytical prediction from the improved vehicle longitudinal model.

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Bustaffa, M., G. Amaryan, R. Gallizzi, E. Papadopoulou-Alataki, M. Carrabba, J. Antón, G. Simonini, et al. "POS0157 THE EUROFEVER FMF LONGITUDINAL COHORT: FIRST LONGITUDINAL DATA." In EULAR 2024 European Congress of Rheumatology, 12-15 June. Vienna, Austria. BMJ Publishing Group Ltd and European League Against Rheumatism, 2024. http://dx.doi.org/10.1136/annrheumdis-2024-eular.5454.

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Notkin, David. "Longitudinal program analysis." In the 2002 ACM SIGPLAN-SIGSOFT workshop. New York, New York, USA: ACM Press, 2002. http://dx.doi.org/10.1145/586094.586095.

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Bradwell, Hannah L., Rhona Winnington, Serge Thill, and Ray B. Jones. "Longitudinal Diary Data." In HRI '20: ACM/IEEE International Conference on Human-Robot Interaction. New York, NY, USA: ACM, 2020. http://dx.doi.org/10.1145/3371382.3378256.

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Weng, W. T. "Fundamentals—longitudinal motion." In PHYSICS OF PARTICLE ACCELERATORS. AIP, 1989. http://dx.doi.org/10.1063/1.38064.

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Biss, David P., Kathleen S. Youngworth, and Thomas G. Brown. "Longitudinal field imaging." In Biomedical Optics 2003, edited by Jose-Angel Conchello, Carol J. Cogswell, and Tony Wilson. SPIE, 2003. http://dx.doi.org/10.1117/12.478347.

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9

Voelker, F. "ALS longitudinal kickers." In Accelerator instrumentation fourth annual workshop. AIP, 1992. http://dx.doi.org/10.1063/1.44337.

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10

Wang, Yong-Yi, Millan Sen, and Peter Song. "Longitudinal Stress Limits in Managing Spans and Other Longitudinal Loads." In 2016 11th International Pipeline Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ipc2016-64533.

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Stresses along the length of pipelines, termed longitudinal stresses, are generated by pipeline construction, service conditions, and changes in pipe support conditions. Although there are no explicit federal regulations limiting longitudinal stresses for in-service pipelines, pipeline operators typically reply on design requirements in established standards, such as ASME B31.4, B31.8, and CSA Z662, to manage possible integrity concerns arising from longitudinal stresses. In this paper longitudinal stress limits in existing standards are reviewed. These standards include CSA Z662, ASME B31.4, ASME B31.8, DNV RP F101 and API RP 1111. These standards provide various formulae or specific values for the longitudinal stress limits. These limits are compared under various levels of internal pressure. Although the potential failure modes addressed by the different standards may be similar, the specific limits on longitudinal stresses differ among the standards. One of the interesting findings is that the limit on compressive longitudinal stress can be very low when the combined stress criteria (von Mises or Tresca) are applied to pipelines operating at a pressure level equivalent to Class 1 design of gas pipelines, i.e., hoop stress being 72% SMYS. The resulting compressive stress limits, at 18–29% SMYS by some standards, are much lower than often quoted 90%, 80%, or 54% SMYS limits. These quoted limits refer to limits for tensile stresses, but sometimes mistaken for compressive stress limits. The low compressive stress limits can be quite difficult to manage for spans after the addition of possible compressive stresses from temperature differential, lateral bending, and other sources. Alternative stress limits that provide a consistent level of safety and in compliance with the spirits of standards are proposed. The new limits are sound from the viewpoint of safety, yet practical to apply. One possibility of increasing the compressive stress limit is reducing the hoop tensile stress by lowering operating pressure. The other possibility is setting a combined equivalent stress limit that is not overly conservative and preserves a sound level of safety. An Example is provided to illustrate the assessment of a span against the stress limits.

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Reports on the topic "Longitudinal"

1

Blaskiewicz, M. Longitudinal Stability Calculations. Office of Scientific and Technical Information (OSTI), January 2009. http://dx.doi.org/10.2172/946777.

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2

Zhang S. Y. and W. Weng. LONGITUDINAL MODE COUPLING. Office of Scientific and Technical Information (OSTI), August 1994. http://dx.doi.org/10.2172/1151307.

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Blaskiewicz M. Longitudinal Stability Calculations. Office of Scientific and Technical Information (OSTI), January 2009. http://dx.doi.org/10.2172/1061931.

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4

Raka, E. Longitudinal stability in RHIC. Office of Scientific and Technical Information (OSTI), September 1996. http://dx.doi.org/10.2172/1118908.

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Peggs, S., and J. Wei. Longitudinal Phase Space Parameters. Office of Scientific and Technical Information (OSTI), July 1996. http://dx.doi.org/10.2172/1119499.

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Kewisch, J., V. Ptitsin, J. Rose, and J. Wei. RHIC Longitudinal Parameter Revision. Office of Scientific and Technical Information (OSTI), December 1997. http://dx.doi.org/10.2172/1119536.

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7

Deng D. P. LONGITUDINAL MOTION - DATA PRESENTATION. Office of Scientific and Technical Information (OSTI), May 1991. http://dx.doi.org/10.2172/1151258.

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Blaskiewicz, M. BARRIER CAVITY LONGITUDINAL DYNAMICS. Office of Scientific and Technical Information (OSTI), January 1995. http://dx.doi.org/10.2172/1151316.

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Ferrer, Emilio. Applied Longitudinal Data Analysis. Instats Inc., 2023. http://dx.doi.org/10.61700/xomktodmxmv62469.

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This comprehensive 3-day workshop is designed to equip researchers with the skills to effectively analyze longitudinal data with classic and advanced modeling techniques. The seminar covers a range of topics from understanding the importance of longitudinal data, handling missing data, modeling growth over time, to practical sessions on applying learned techniques using real-world data, with an official Instats certificate of completion provided at the conclusion. An official Instats certificate of completion and 2 ECTS Equivalent points are provided at the conclusion of the seminar.

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10

Raka, E. Longitudinal damping rates in RHIC. Office of Scientific and Technical Information (OSTI), February 1998. http://dx.doi.org/10.2172/1118910.

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