Relevant bibliographies by topics / Gems, Classical

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Gems, Classical'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Gems, Classical"

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Mattusch, Carol, and Martin Henig. "Classical Gems." Classical World 91, no. 4 (1998): 292. http://dx.doi.org/10.2307/4352075.

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Gill, D. "Review. Classical gems. Classical gems: ancient and modern intaglios and cameos in the Fitzwilliam Museum, Cambridge. M Henig et al." Classical Review 46, no. 2 (February 1, 1996): 342–43. http://dx.doi.org/10.1093/cr/46.2.342.

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Cooper, B. Lee. "Classical Gassers: Pop Gems Inspired by the Great Composers." Popular Music and Society 40, no. 3 (December 2, 2016): 365–66. http://dx.doi.org/10.1080/03007766.2016.1257222.

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Kotansky, Roy, and Jeffrey Spier. "The “Horned Hunter” on a Lost Gnostic Gem." Harvard Theological Review 88, no. 3 (July 1995): 315–37. http://dx.doi.org/10.1017/s0017816000030832.

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The noted Provencal antiquarian Nicolas-Claude Fabri de Peiresc (1580-1637), perhaps the most dedicated of an international circle of acquaintances studying and collecting classical antiquities in the early seventeenth century, took an especially keen interest in ancient gems. With his friend, the painter Peter Paul Rubens (1577-1640), he planned an extensive publication on the subject that unfortunately never saw completion. Although Peiresc focused most of his attention on collecting Roman gems portraying classical iconography, he was also intrigued by the enigmatic series of magical gems—as were many others in the Renaissance, who considered the gems to be the products of early Gnostic heretics. A correspondence between Peiresc and Rubens in 1623, frequently cited in the modern literature, discusses the putative meaning of an amulet in Rubens's collection depicting a bell-shaped object thought to represent the “divine womb.” The gem is a Renaissance forgery based on genuine ancient examples; the concurrent—and correct—identification of this puzzling type as a uterus, however, contrasts markedly with the fanciful interpretations later fashionable in the nineteenth century.
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Nagy, Árpád M. "Figuring out the Anguipede (‘snake-legged god’) and his relation to Judaism." Journal of Roman Archaeology 15 (2002): 159–72. http://dx.doi.org/10.1017/s104775940001388x.

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So-called magical gems constitute an especially rich body of material evidence for magic and religion in the Roman Empire. They differ from the ordinary run of gems in three respects: in their selection of iconographic types, normally divine images of one sort or another; by their use of magic words and occasionally longer texts, primarily in Greek script; and by their use of magic signs, usually called characteres. At least one of these three elements must be present for a gem to be identifiable as magical. These “Zaubergemmen” form the most easily distinguishable sub-group of the wider class of amuletic gems, that is, engraved stones of talismanic function. The majority of the iconographic schemes appearing on magical gems adhere closely to the classical Graeco-Roman and Egyptian traditions. Others, however, are unique to this class of gems: rare even on other magical objects, they are practically unknown outside this sphere in the whole variety of ancient art.
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SAGIV, IDIT. "THE IMAGE OF THE RIDER ON GRECO-ROMAN ENGRAVED GEMS FROM THE ISRAEL MUSEUM (JERUSALEM)." ИСТРАЖИВАЊА, no. 27 (December 19, 2016): 33–44. http://dx.doi.org/10.19090/i.2016.27.33-44.

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This paper explores the interpretations and context of equestrian Greco-Roman engraved gems kept at the Israel Museum in Jerusalem which had never been published prior to this study. It was written on the basis of a study which included photography, description, technical aspects, iconographic and stylistic analysis and, finally, dating the gems. In order to achieve this, they were compared to other known ones that had already been published. The results indicate that horsemen frequently appear as subjects on intaglios. The Roman engraved gems drew their inspiration from established Greek rider imagery. Under the Roman Empire, the rider image became the preserve of that new divine figure, the emperor. The Imperial rider combined the attributes of a Bellerophon or the Dioscuri of the Classical period and an Alexander of the Hellenistic. Also, Gauls are fairly common in art and there are quite a number of Celtic/Gaulish horsemen on gems. Presumably, people wore such gems as a reminder of the iconic defeat of the Northern barbarians by the Attalids and more recent Roman triumphs. In addition, there are several examples of gems, on which appears a rider beneath whose horse a lion or another animal is lying. It is likely that this rider was perceived by the gem engraver and owner as some god or hero. Since these depictions of cavalry on gems are similar to the “Heros Equitans” image, possibly they were inspired by it and so were the depictions of the emperors. Thus it is concluded that applying representations of riders on engraved gems demonstrates the possible wish of affluent, albeit ordinary people to resemble the ruling class as well as heroes through the purchase and use of these gems which also bear additional meanings of bravery and immortality.
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Henig, Martin. "Three Gems in the Society's Collection." Antiquaries Journal 79 (September 1999): 389–92. http://dx.doi.org/10.1017/s0003581500044590.

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The purpose of this note is to mark the transfer to the Society's museum of three Roman gemstones which came into my possession as gifts at different times and which I decided I would like to share with the Fellowship in general. The Society, indeed, has long owned a number of medieval and later seals and sealings, a few of which were recently displayed in the entrance lobby, and it has long seemed to me that the inclusion of Roman intaglios would make its holdings more representative for future students. Historians of medieval sigillography in the past were rather ignorant of Roman gems and, indeed, of Classical iconography in general and more curiously were hardly aware that the seal use of the Middle Ages almost exactly parallels earlier Roman practice. However, since the recent publication of a general book on sealing, the basic continuity of the tradition should be obvious to all.
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Neverov, O. Y. "GEMS AND FINGER-RINGS FROM NYMPHAEUM (Towards α Monograph of Classical Glyptics)." Ancient Civilizations from Scythia to Siberia 6, no. 3-4 (2000): 179–91. http://dx.doi.org/10.1163/157005700x00140.

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III, Cornelius C. Vermeule, and Martin Henig. "Classical Gems: Ancient and Modern Intaglios and Cameos in the Eitzwilliam Museum, Cambridge." American Journal of Archaeology 101, no. 3 (July 1997): 624. http://dx.doi.org/10.2307/507140.

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Hall, Edith. "How much did pottery workers know about classical art and civilisation?" Bulletin of the Institute of Classical Studies 63, no. 1 (June 1, 2020): 17–33. http://dx.doi.org/10.1093/bics/qbaa005.

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Abstract The voices of pottery workers across the British Isles during the heyday of the taste for classically themed ceramics are almost silent to us, since so few left memoirs or diaries. But other sources cumulatively build up a picture of skilled male, female, and child workers familiar with multifarious ancient artefacts and books visually reproducing them. At Etruria and Herculaneum, workers were encouraged to see themselves as participants in the rebirth of the ancient ceramic arts; they were trained in painstaking reproduction of details not only from ancient vases but from ancient gems, intaglios, ivories, coins, bas-reliefs, frescoes, friezes, statues, and sarcophagi. They were familiar with the stories of a substantial number of ancient mythical and historical figures, and the different aesthetic conventions of classical Athenian, Hellenistic, and Roman art. Some were even able to study antiquity at institutions of adult education, and had access to well-stocked workers’ libraries.
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Dissertations / Theses on the topic "Gems, Classical"

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Dembski, Günther. "Die antiken Gemmen und Kameen aus Carnuntum /." Wien : Phoibos-Verl, 2005. http://www.loc.gov/catdir/toc/fy0608/2005458404.html.

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Menes, Julia C. "The Tazza Farnese : a reinterpretation /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p1420940.

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Backe-Forsberg, Yvonne. "Crossing the Bridge : An Interpretation of the Archaeological Remains in the Etruscan Bridge Complex at San Giovenale, Etruria." Doctoral thesis, Uppsala University, Department of Archaeology and Ancient History, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4770.

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This thesis discusses the archaeological remains in the Etruscan bridge complex, found during the excavations at San Giovenale in 1959–1963, and 1999. The aim has been to reach a holistic perspective of the bridge complex with the bridge seen as a link between topography, economy, social relationships, politics, symbols and ritual, reflecting its importance for the whole community at San Giovenale and its surroundings. Situated at the border between the two largest city-states Tarquinia and Caere, the site seems to have been an important middle range transit town for foreign ideas, goods and people.

The character of the remains and the various levels of contextual analyses made it possible to distinguish five distinctive functions for the structures at the bridge over the Pietrisco. From a more generalised point of view these suggested that specialized functions may be divided into practical, social and symbolic functions and these aspects have been of help in identifying an object or a structure. Besides practical functions of everyday use, economic and strategic functions have also been considered.

These functions were more or less in use contemporaneously, at least during several hundred years, from about the middle of the 6th down to the first century B.C. Pottery and small finds show that some activity has taken place at the site from the 9th century. Features of continuity, such as in the choice of crossing, the direction of the bridge construction after its destruction, the architectural ground-plans, the use of basins and a well, pottery fabrics of local and Greek imports and shapes, as well as changes in ground-plans, slight changes in the environment due to water erosion, earth-quakes and slides, have been observed. The physical as well as the liminal boundary between land and water as well as between man and spirits was accentuated by the tufa building, the water installations, and the road at the northern abutment. The thesis raises the hypothesis that the Etruscans believed that a crossing of a river via a bridge could violate the spirits of nature on land and in the water and therefore special rites were needed to restore the balance between nature and man before entering the bridge in order to reach safely at the other side of the ravine. The bridge itself can be seen as sacred, a liminal area where time and space do not exist and a place where it is easy to gain contact with the supernatural world.

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Books on the topic "Gems, Classical"

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Piccole sculture preziose dell'Impero romano. Modena: F. C. Panini, 2006.

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Die antiken Gemmen und Kameen aus Carnuntum. Wien: Phoibos, 2005.

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Spier, Jeffrey. Late Antique and Early Christian gems. Wiesbaden: Reichert, 2007.

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Ancient gems from the Borowski collection. Ruhpolding [Germany]: Franz Philipp Rutzen, 2007.

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Altertumsverein, Niederrheinischer, ed. Die antiken Gemmen aus Xanten im Besitz des Niederrheinischen Altertumsvereins, des Rheinischen Landesmuseums Bonn, der Katholischen Kirchengemeinde St. Viktor und des Regionalmuseums Xanten. Köln: Rheinland-Verlag, 1987.

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Fortuna della glittica nella Toscana mediceo-lorenese e storia del Discorso sopra le gemme intagliate di G. Pelli Bencivenni. Firenze: SPES, 2004.

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James Tassie, 1735-1799: Modeller in glass, a classical approach. London: Mallett, 1995.

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Platz-Horster, Gertrud. Die antiken Gemmen aus Xanten. Köln: Rheinland-Verlag, 1994.

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M, Facchini Giuliana, ed. Guida alla collezione di impronte di gemme antiche e all'antica dei Civici musei d'arte di Verona. Milano: Edizioni Et, 2014.

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Tees, Eunice A. The ancient and classicising finger-rings and gems. Amsterdam: J.C. Gieben, 1993.

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Book chapters on the topic "Gems, Classical"

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Monazzah, Amir Mahdi Hosseini, Amir M. Rahmani, Antonio Miele, and Nikil Dutt. "Exploiting Memory Resilience for Emerging Technologies: An Energy-Aware Resilience Exemplar for STT-RAM Memories." In Dependable Embedded Systems, 505–26. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-52017-5_21.

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AbstractDue to the consistent pressing quest of larger on-chip memories and caches of multicore and manycore architectures, Spin Transfer Torque Magnetic RAM (STT-MRAM or STT-RAM) has been proposed as a promising technology to replace classical SRAMs in near-future devices. Main advantages of STT-RAMs are a considerably higher transistor density and a negligible leakage power compared with SRAM technology. However, the drawback of this technology is the high probability of errors occurring especially in write operations. Such errors are asymmetric and transition-dependent, where 0 → 1 is the most critical one, and is high subjected to the amount and current (voltage) supplied to the memory during the write operation. As a consequence, STT-RAMs present an intrinsic trade-off between energy consumption vs. reliability that needs to be properly tuned w.r.t. the currently running application and its reliability requirement. This chapter proposes FlexRel, an energy-aware reliability improvement architectural scheme for STT-RAM cache memories. FlexRel considers a memory architecture provided with Error Correction Codes (ECCs) and a custom current regulator for the various cache ways and conducts a trade-off between reliability and energy consumption. FlexRel cache controller dynamically profiles the number of 0 → 1 transitions of each individual bit write operation in a cache block and based on that selects the most-suitable cache way and current level to guarantee the necessary error rate threshold (in terms of occurred write errors) while minimizing the energy consumption. We experimentally evaluated the efficiency of FlexRel against the most efficient uniform protection scheme from reliability, energy, area, and performance perspectives. Experimental simulations performed by using gem5 has demonstrated that while FlexRel satisfies the given error rate threshold, it delivers up to 13.2% energy saving. From the area footprint perspective, FlexRel delivers up to 7.9% cache ways’ area saving. Furthermore, the performance overhead of the FlexRel algorithm which changes the traffic patterns of the cache ways during the executions is 1.7%, on average.
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"GEMS, BOB AND CLAUDIA." In A Classical Archaeologist’s Life: The Story so Far, 217–33. Archaeopress Publishing Ltd, 2020. http://dx.doi.org/10.2307/j.ctv15vwjgf.6.

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Mercer-Taylor, Peter. "An Immigrant’s Musical Memoir." In Gems of Exquisite Beauty, 68–95. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190842796.003.0003.

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This chapter centers on the 1819 Original Collection compiled by Arthur Clifton, an English musician who had emigrated to Baltimore in 1817 (changing his name, from Antony Corri, in the process). Though not a commercial success, this pathbreaking volume was the first American publication to present a substantial body of material drawn from European classical music in psalmodic form, containing 21 psalm and hymn tunes culled variously from the work of Gluck, Haydn, Mozart, and Beethoven. Such adaptations had been enjoying a modest vogue in England since around the turn of the century, but only half a dozen or so had appeared in the United States. Clifton relied on existing London publications for inspiration—many of the European melodies he includes had already been adapted by English compilers. But he returns to the classical music sources themselves in almost every case, developing his own meticulously crafted body of adaptations.
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Mercer-Taylor, Peter. "Institutional Certification." In Gems of Exquisite Beauty, 96–133. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190842796.003.0004.

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The 1822 Boston Handel and Haydn Society Collection of Church Music contains 21 psalm and hymn tunes drawn from the work of Gluck, Haydn, Mozart, and Beethoven, all based closely on adaptations already circulating in London. The volume represented a novel conceptual convergence of the stylistically Europeanized sacred tune books of the earlier “Ancient Music” movement and the Handel and Haydn Society’s own existing compilations of (non-psalmodic) classical music abstracts. With sales reaching around 50,000, this astonishingly popular volume provided thousands of Americans their first exposure to such adaptations. It also launched the career of its compiler Lowell Mason, who would emerge as the era’s most influential American musical figure, active as compiler, teacher, administrator, and conductor. Central as psalmodic adaptations of classical music were to this landmark 1822 volume, however, such adaptations did not immediately catch on, making only sporadic appearances in American tune books over the following fifteen years.
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Mercer-Taylor, Peter. "Epilogue." In Gems of Exquisite Beauty, 255–60. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190842796.003.0007.

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IN THE DECADES leading up to the Civil War, the realms of classical music, Protestant Christian song, and mass-market popular music vibrantly converged in a single American repertoire. That convergence, the topic of this book, was temporary. Few of the cultural conditions that brought this repertoire into being persist to the present day. The notion that the United States is a normatively Christian nation is far from extinct, but its ultimate extinction seems likely. And most of Protestantism’s cultural trappings have thankfully lost whatever veneer they once enjoyed of unselfconscious universality. Choral music, meanwhile, is still performed in professional, ecclesiastical, convivial, and domestic settings alike. But most music enjoyed by Americans in daily life is recorded music, and when they make music themselves, it is mostly other kinds of music they make. Perhaps most important, that gulf that separated antebellum Americans’ nascent awareness of European classical music as a thing of value from opportunities for the actual experience of that music—the gap whose bridging comprised a core justification for this repertoire of psalmodic adaptations—has closed. For the great majority of Americans who care to seek them out, almost any of the European works tabulated in ...
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Mercer-Taylor, Peter. "Heyday." In Gems of Exquisite Beauty, 134–93. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190842796.003.0005.

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The vast expansion of the American music-making infrastructure through the 1840s brought with it a vast expansion of interest in psalmodic adaptations of classical music. Hundreds of such adaptations appeared in a gathering wave of activity that crested around 1850. This chapter’s survey of this midcentury mania sets off with George Kingsley, whose 1838 Sacred Choir (with 24 tunes culled from major composers’ work) spearheaded this wave, and whose commitment to such adaptations proved more energetic and sustained than any contemporary’s. The discussion goes on to center on two hubs of activity in turn: New York (home to such compilers as Ureli Corelli Hill, Elam Ives, William Bradbury, and Thomas Hastings) and Boston (where the effort was led by Lowell Mason and Benjamin Franklin Baker). The chapter closes with reflections on the manifold reasons for the practice’s steep decline after about 1853.
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Mercer-Taylor, Peter. "Antebellum Psalmody in Its Cultural Context." In Gems of Exquisite Beauty, 24–67. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190842796.003.0002.

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Christian worship factored centrally in the American circulation of psalm and hymn tunes in the 19th century, but the repertoire traveled far and wide beyond actual church services. Musical societies, conventions, singing schools, social gatherings of a religious nature, and domestic settings all provided venues for the singing of psalmody. This chapter undertakes a broad exploration of the place of psalm and hymn tunes in pre–Civil War American culture. In its closing stretch, however, it pivots toward those vibrant registers of American sacred music-making that lay beyond the Europeanized psalmodic practices that form this book’s focus. Psalmodic adaptations of classical music would never have been encountered by most of the nation’s enslaved, nor by most Native Americans. They also had little impact on the lives of many in the country’s southern and western regions who preferred the markedly different psalmodic tradition associated with “shape notes.”
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Mercer-Taylor, Peter. "Psalmodic Adaptation as Musical Translation." In Gems of Exquisite Beauty, 194–254. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190842796.003.0006.

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The psalmodic adaptation of classical music constitutes a distinctive creative act in instances in which we find adapters not simply importing excerpts essentially unchanged (a chiefly curatorial service), but making substantive musical decisions to bridge the gap dividing art music from psalmody. This chapter explores such “translational actions,” unfolding in four phases. The first concerns low-level decisions, involving rhythm, ornamentation, and texture. The second centers on syntactic challenges that arise in drawing brief excerpts from larger works (negotiating European passages that begin and end in different keys, for instance). The third focuses on “purposeful substitution”: the replacement of musical effects inappropriate to psalmody with wholly different effects calculated to achieve comparable goals. The fourth explores adaptations that challenge the very notion of a one-to-one correspondence between “excerpt” and “psalm tune”: tunes that draw on more than one European movement, say, or adjacent pairs of tunes drawn from a common source.
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Jackson, Robert, Georg Sørensen, and Jørgen Møller. "6. International Political Economy: Classical Theories." In Introduction to International Relations, 177–96. Oxford University Press, 2018. http://dx.doi.org/10.1093/hepl/9780198803577.003.0006.

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This chapter examines the three most important classical theories within the field of International Political Economy (IPE): mercantilism, economic liberalism, and neo-Marxism. It considers the relationship between politics and economics, and between states and markets in world affairs, that IR has to be able to grasp. It suggests that IPE is about wealth, poverty, and power, about who gets what in the international economic and political system. The outlook of mercantilism has much in common with realism, while economic liberalism is an addition to liberalism. Mercantilism and economic liberalism thus represent views on IPE that are basically realist and liberal. The chapter concludes with a discussion about the original theoretical position of Marxism.
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Jackson, Robert, and Georg Sørensen. "6. International Political Economy: Classical Theories." In Introduction to International Relations. Oxford University Press, 2015. http://dx.doi.org/10.1093/hepl/9780198707554.003.0006.

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This chapter examines the three most important classical theories within the field of International Political Economy (IPE): mercantilism, economic liberalism, and neo-Marxism. It also considers the relationship between politics and economics, and between states and markets in world affairs, that IR has to be able to grasp. It suggests that IPE is about wealth and poverty, about who gets what in the international economic and political system. The outlook of mercantilism has much in common with realism, while economic liberalism is an addition to liberalism. Mercantilism and economic liberalism thus represent views on IPE that are basically realist and liberal. The chapter concludes with discusses the original theoretical position of Marxism.
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Conference papers on the topic "Gems, Classical"

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Gouadria, Faten, Lassaad Sbita, and Nick Sigrimis. "Comparison between self-tuning fuzzy PID and classic PID controllers for greenhouse system." In 2017 International Conference on Green Energy Conversion Systems (GECS). IEEE, 2017. http://dx.doi.org/10.1109/gecs.2017.8066169.

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Waghmare, Prashant R., Siddhartha Das, and Sushanta K. Mitra. "Drop Deposition Technique on Low Energy Surface." In ASME 2013 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fedsm2013-16265.

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In this paper we propose a new technique for drop deposition on low energy surfaces, which addresses the limitations of the classical drop deposition technique. In this classical technique, a drop is deposited on a surface by bringing a needle, holding the drop, in proximity to the solid surface. Therefore, irrespective of whether the solid surface is in air or under a liquid, it becomes extremely difficult to deposit the drop on low energy surfaces owing to the large differences between the drop-needle and the drop-substrate adhesion forces (or surface energies). In our discussed method, we overcome this difficulty for low energy surfaces immersed in a liquid. For surfaces under liquid, there is an interface in addition to the solid-liquid interface: this interface is the air-liquid interface, where the liquid gets exhausted. In our technique, we cater the (un)favorable drop spreading dynamics at this interface to ensure that the drop gets deposited on the under-liquid surface.
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Gacto, Maria Jose, Rafael Alcala, and Francisco Herrera. "Evolutionary Multi-Objective Algorithm to effectively improve the performance of the classic tuning of fuzzy logic controllers for a heating, ventilating and Air Conditioning system." In 2011 Ieee 5Th International Workshop On Genetic And Evolutionary Fuzzy Systems - Part Of 17273 - 2011 Ssci. IEEE, 2011. http://dx.doi.org/10.1109/gefs.2011.5949494.

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Brulliard, Violette, Erwan Verron, and Steven Le Corre. "Derivation of a New Model Including the Effect of Swelling on Finite Strain Properties for Polymeric Gels." In ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82560.

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Polymeric gels consist in a cross-linked polymer chains network which contains a large quantity of solvent molecules. The main property of gels is their ability to absorb solvent molecules without being dissolved, and to shrink when they release fluid. This swelling/deswelling phenomenon involves large volume changes of the gel, when the solvent diffuses into the large strain elastic solid. In recent literature, constitutive equations, in which the gel is considered as a single continuum body, have been derived to describe such a coupled deformation/diffusion problem. However, these works are based on the simple mono-dimensional models of both Flory and Treloar devoted to rubber swelling. The aim of the present work is the derivation of a new constitutive equation based on an original definition of the elastic strain energy. The differences with the classical theory are highlighted on two simple examples.
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Boehle, M., M. Cagna, and Lutz Itter. "Compressible Flow in Inlet Guide Vanes With Mechanical Flaps." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53191.

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The classical type of inlet guide vanes consists of uncambered or slightly cambered profiles, the stagger angle of which can be varied. A more advantageous possibility of generating an angular momentum in front of the rotor of the first stage contains the application of inlet guide vanes with mechanical flaps. This configuration consists of uncambered profiles with mechanical flaps. In the present paper, flow physics is explained for this configuration and compared with the flow physics for the classical type of inlet guide vanes. The configuration with mechanical flaps is examined numerically for 20 deg. and 32 deg. flap angles. The emphasis lies on the description of the compressible flow phenomena, which become dominant if the Mach number of the incoming flow gets close to the critical Mach number. An analytical estimation for the Mach number at the exit of the guide vanes is introduced and the results are discussed together with the results of the CFD simulations.
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Livne, Ariel, Gil Cohen, and Jay Fineberg. "Fast Fracture in Slow Motion." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59132.

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We present recent results of fracture experiments in polyacrylamide gels. Polyacrylamide gels are soft polymer materials in which the characteristic sound speeds are on the order of a few meters/sec — thereby slowing down fracture dynamics by 3 orders of magnitude. We first demonstrate the universality of rapid fracture dynamics, comparing dynamics observed in gels with those seen in “classic” brittle materials such as glass. Among the common features are the appearance and form of branching instabilities as well as characteristic attributes of the resulting fracture surface that provide evidence for crack front inertia when translational invariance along the front is broken. We then demonstrate a number wholly new aspects of the fracture process, whose study is only made possible by utilizing the “slow motion” inherent in the fracture of these materials. These include both a new oscillatory instability at about 90% of the Rayleigh wave speed and measurements of the nonlinear zone at the tip of dynamic cracks.
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Omegna, Federica, Gianfranco Genta, Emanuele M. Barini, Daniele L. Marchisio, and Raffaello Levi. "Sensitivity Testing Revisited: The Case of Sol-Gel Transition." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59091.

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Classical sensitivity testing addresses mainly problems where the level of one stimulus only governs an abrupt transition in output, or response. Both parametric and nonparametric methods developed, and successfully applied over last century to tackle such problems, provide estimates of critical levels beyond which an item will either respond, or not, to a single stimulus, and of related statistics. However classical methods sometimes may not readily provide an answer, namely when more than one stimulus may reach critical level, and either singularly or jointly trigger transition. Factorial and response surface designs, adequate when dealing with continuous responses, may not perform as well for transition threshold estimation. A practical case at hand in chemical engineering concerns the production, through hydrolysis of a specific precursor, of titania sols and gels that find industrial use as additive for paints, concrete and other building materials due to its optical, photo-catalytic and super-hydrophilic properties. Particles formation and aggregation — controlled by varying the primary process parameters, namely initial alkoxide concentration, water to alkoxide and acid to alkoxide ratios, mixing conditions — may yield either stable, transparent nanometric sols, or monolithic gels, where aggregation of nanometric particles produces a final ceramic object. Depending on the application, one of the two products may be desirable, and therefore it is crucial to control the final product properties. Aggregation kinetics and physical properties of sols, and sol to gel transition, were found to depend strongly upon several factors, that is water to alkoxide initial concentration ratio, acid to alkoxide initial concentration ratio, and their interaction. The approach developed in order to estimate parameters pertaining to transition, and related uncertainty, is presented in the paper, and discussed in the light of experimental results.
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8

Sonneville, Valentin, Olivier A. Bauchau, and Olivier Brüls. "On the Compatibility Equations in Geometrically Exact Beam Finite Element." In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-59954.

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This paper discusses the compatibility equations which relate the velocity field and the strain field in geometrically exact beam theory. The analysis is carried out in the context of intrinsic equations, namely the dynamic equilibrium equations are formulated in terms of local velocities and strains only. In addition to the well established objectivity and path-independence requirements of the spatial discretization, these compatibility equations show that a consistent spatial interpolation of the velocity field should depend on the curvature of the beam, including initial curvature and curvature from the deformation, and it is shown that this consistency is connected to the ability of the finite element to represent exactly rigid body motion velocities. A two node interpolation scheme is studied and it appears that, as the element gets smaller under mesh refinement, the effect of this dependency reduces, leading eventually to the classical linear shape functions.
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9

Carbonelli, Alexandre, Joe¨l Perret-Liaudet, Emmanuel Rigaud, and Mohamed-Sai¨d Feki. "Investigation of Restitution Coefficient and Spring-Damper Models for the Bouncing Ball Problem." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47870.

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The non linear system under study consists on the bouncing ball problem. Focusing on the n-T periodic solutions and the permanent contact motion, simulations performed underline the effect of spring-damper contact model in comparison with the classical restitution coefficient. Both approaches are implemented in an adimensional way. For the restitution coefficient approach, iterating maps are easy to obtain after some assumptions. On the contrary, the spring-damper model leads to transcendental equations needing the use of numerical continuation methods. The damping ratio is defined as a function of the restitution coefficient. The effect of the contact stiffness is studied. For high values of the contact stiffness, the spring-damper model has the same behavior as the restitution coefficient model as the impact duration gets shorter. Predictions of the two models diverge when the contact stiffness decreases. Results are illustrated by time histories and Poincare´ Maps of dynamic responses. This paper aims to be guideline to quantify the error made by making the assumptions required for a restitution coefficient model.
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Leung, A. Y. T. "Algorithms for Large Eigenvalue Problems in Vibration and Buckling Analyses." In ASME 1997 Turbo Asia Conference. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-aa-089.

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The eigenvalue problem plays a central role in the dynamic and buckling analyses of engineering structures. In practice, one is interested in only a few dozens of the eigenmodes of a system of thousands of degrees of freedom within a particular eigenvalue range. For linear symmetric eigenproblems, [K]{x} = λ[M]{x}, the eigensolutions are well behaved. The recommendations are subspace iteration or the Lanczos method working with [A] = [K-λ0 M]−1 where λ0 is the middle of the eigenvalue range of interest. Subspace iteration gets both eigenvalues and eigenvectors. Lanczos gives the approximate eigenvalues which can easily be improved by inverse iteration to obtain the eigenvectors as by-products. For real nonsymmetric or complex symmetric linear eigenprohlems and polynomial eigenproblems, the eigensolutions may be defective. All classical methods, including subspace iteration fail. We recommend to use the Lanczos method to obtain the approximate eigenvalues of interest and to improve them by a new variance of inverse iteration, one vector at a time, and to get the independent generalised vectors as hy-products. We develop solution method for the special case that the approximate eigenvalue is indeed exact rendering a set of singular linear equations which can not be solved by existing algorithms.
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