1,744 research outputs found
Numerical Analysis of Damage Iinitiation and Development in Bends of Steel Pipelines
No full textGasses and fluids are transported via an extensive infrastructure of steel pipelines. In the design of pipeline systems the use of elbows (pipe bends) is important because their flexibility makes them able to sustain significant deformations. These bends can be subjected to permanent deformations due to various load combinations which can lead to progressive material damage. There are three stages commonly observed in ductile damage: void nucleation, growth and coalescence. When subjected to varying bending loads low cycle fatigue damage may occur. Within this research project Finite Element Analysis is used to simulate the response of pipeline bends. Two element types are implemented to model a pipe bend, the classical shell element and an efficient tube element (pipe elbow element), respectively. To predict the structural response when subjected to monotonic loading a damage model is implemented for both elements. When subjected to cyclic loading three phases can be identified. During the first few cycles the permanent deformation increases rapidly. After some cycles, the rate of permanent deformation stabilizes until the point of response degradation. In order to capture this response a new material model, based upon the afore mentioned model, is proposed. Experiments have indicated that this model is well suited to determine the point of material failure.Structural MechanicsCivil Engineering and Geoscience
CLASSICAL STUDIES:TO 155-TH ANNIVERSARY OF A.E. ALEKTOROV
No full textThe article, written in the genre of the response to read the book, devoted to the 155 anniversary since the birth of A. E. Alektorov. The author attempts to comprehend and describe the publishing and pedagogical activity of A.E. Alektorov for example, fundamental bibliographic work
The A.E. Coppard Papers at Syracuse
No full textSome of the most choice collections in the Manuscript Department of Syracuse University Libraries are also among the most modest in extent. The papers of English author and poet A.E. Coppard fit into both categories. Housed comfortably in a single box, fifty-five letters, three short stories in holograph and one speech provide a close look at Coppard\u27s literary theories, criticism, opinions of his own work and that of a few others, reaction to approaches regarding dramatizing, filming or televising his prose works, dealings with publishers, and his activities on behalf of world peace through the Authors\u27 World Peace Appeal in the early 1950\u27s
Variation in baobab (Adansonia digitata L.) leaf morphology and its relation to drought tolerance
No full textThe baobab tree (Adansonia digitata L.) is a valued savannah tree. Although variation in fruit characteristics of this tree have been studied, no studies to our knowledge have been carried out on variation of leaf morphology which can be linked to drought adaptation mechanisms. Accessions of baobab from different ecosystems in Benin were characterised for leaf size and thickness, stomata size and density on the abaxial surface of leaves. Significant variation was found in leaf size and stomata characteristics. Trees from northern study sites had higher stomata density and smaller guard cell length than those from southern study sites. The results show that pruning has a significant effect on leaf size, but not on stomatal characteristics. Trees from northern study sites showed more xerophytic characteristics than those from the south. It seems that genetic and physiological effects may play a role in baobab drought adaptation
Covariance matrix-based fire and flame detection method in video
No full textThis paper proposes a video-based fire detection
system which uses color, spatial and temporal information.
The system divides the video into spatio-temporal blocks and
uses covariance-based features extracted from these blocks
to detect fire. Feature vectors take advantage of both the spatial and the temporal characteristics of flame-colored regions. The extracted features are trained and tested using a support vector machine (SVM) classifier. The system does not use a background subtraction method to segment moving regions and can be used, to some extent, with non-stationary cameras. The computationally efficient method can process 320×240 video frames at around 20 frames per second in an ordinary PC with a dual core 2.2 GHz processor. In addition, it is shown to outperform a previous method in terms of detection performance
The Ethical Economy of Customer Coproduction
No full textIn this article, the author argues that customer coproduction should be understood as an expression of a large-scale trend toward the increasing power and relevance of social production. Social production consists in the self-organized systems of (mostly immaterial) production that have evolved around the diffusion of networked information and communication tech-nologies. An analysis of the genealogy of social production is shared; this includes tracing it to the process of re-mediation of social relations put in motion by the expansion of the capitalist economy into the fields of culture and consciousness and the concomitant socialization of production relations. The author then argues that social production, including customer coproduction, follows a very particular economic logic—that is, an ethical economy where value is related to social impact rather than monetary accumulation. A detailed analysis of the logic of this ethical economy is offered; it draws out some implications for the successful management of ever more customer-centric brands, whereby the consumers are directly involved in the processes that add value
Governors [sic] Guard Quick Step.
No full textda capopianoComposed expressly for the Governors [sic] GuardJohns Hopkins University, Levy Sheet Music Collection, Box
013, Item 047Composed by Miss A.E. Prince
Governors [sic] Guard Quick Step.
No full textda capopianoComposed expressly for the Governors [sic] GuardJohns Hopkins University, Levy Sheet Music Collection, Box
013, Item 047Composed by Miss A.E. Prince
Prefazione [a: Michail Kuzmin, Le stagioni dell'amore, Bari, Stilo, 2020, 172 pp.]
No full text"Kuranty ljubvi" (Le stagioni dell'amore) è un piccolo, ma poeticamente significativo, contributo alla produzione letteraria del Simbolismo russo nel segno della sintesi delle arti. Michail Kuzmin, uno dei più importanti scrittori di quell'epoca, è l'autore del ciclo poetico-musicale e delle partiture."Kuranty ljubvi" (The seasons of love) is a small but poetically significant contribution to the literary production of Russian Symbolism in the context of the synthesis of the arts. Michail Kuzmin, one of the most important writers of that era, is the author of the poetic-musical cycle and of the scores
"Acoustic emission" gedrag van verschillende grondsoorten
No full textNaar aanleiding van de vraagstelling of de A.B.-meetmethode toegepast zou kunnen worden voor nadere Informatie over de stabiliteit van dijklichamen, zijn laboratorium-, schaal- en veldproeven uitgevoerd. Uit de triaxiaalproeven is gebleken, dat voor zowel klei, veen als zand er een correlatie was tussen "A.E.-counts" en rek. Verder blijkt zand de meeste "A.E.-activiteit" te vertonen. Klei en veen bleken aanzienlijk minder A.E.activiteit op te leveren. Gezien de resultaten uit het laboratoriumonderzoek werd besloten de eerste model- en veldproeven uit te voeren op zand. Als demonstratie van de "A.E.-meetmethode" werden enkele plaatdrukproeven in de modelhal van het L.G.M. op droog Oosterschelde zand uitgevoerd. Ook bij deze proeven bleek een duidelijke correlatie aanwezig te zijn tussen de zakking van de plaat in het zandpakket en de "A.E.-counts". Verder werd het "Kaisereffect" waargenomen, (zie pagina 58). Voor de veldproeven werd als eerste lokatie gezocht naar een zandig (droog tot half verzadigd) terrein. Vijf veldproeven werden uitgevoerd op het opgespoten terrein van Europoort. Bij deze veldproeven werd een sleuf gegraven, waarbij de "A.E.-activiteit" werd bestudeerd ten gevolge van afnemende stabiliteit van de wand van de sleuf. Voornaamste conclusie bij deze veldmetingen was, dat bij de afnemende stabiliteit van de wand, grote "A.E.-activiteit" meetbaar was aan de rand van de sleuf. Verder werd het begin van het ontstaan van zandschollen en oppervlakte scheuren duidelijk eerder waargenomen door het A.E.-meetsysteem dan visueel.TAW/EN
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