Relevant bibliographies by topics / Backwards time travel

Academic literature on the topic 'Backwards time travel'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Backwards time travel"

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Miller, Kristie. "IS SOME BACKWARDS TIME TRAVEL INEXPLICABLE?" American Philosophical Quarterly 54, no. 2 (April 1, 2017): 131–40. http://dx.doi.org/10.2307/44982131.

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Abstract It has been suggested that there is something worrisome, puzzling, or incomprehensible about the sorts of causal loops sometimes involved in backwards time travel. This paper disentangles two distinct puzzles and evaluates whether they provide us reason to find backwards time travel incomprehensible, inexplicable, or otherwise worrisome. The paper argues that they provide no such reason.
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Brown, Bryson. "Defending Backwards Causation1." Canadian Journal of Philosophy 22, no. 4 (December 1992): 429–43. http://dx.doi.org/10.1080/00455091.1992.10717290.

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Whether we’re reading H.G. Wells, Robert Heinlein, Ray Bradbury, or Kurt Vonnegut, time travel is a wonderful narrative trick, freeing a story from the normal ‘one damn thing after another’ progression of time. But many philosophers claim it can never be more than that because backwards causation in general, and time travel in particular, are logically impossible.In this paper I examine one type of argument commonly given for this disappointing conclusion: the time travel paradoxes. Happily for science fiction fans, these arguments fall far short of showing what they are intended to show. Why they fail can be better understood in the light of an analogy between these arguments and some arguments libertarians offer against determinism.
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Martínez, Manolo. "Travelling in Branching Time." Disputatio 4, no. 31 (November 1, 2011): 271–87. http://dx.doi.org/10.2478/disp-2011-0013.

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Abstract Miller (2005) and Miller (2008) argue that the branching picture of time is incompatible with the possibility of backwards time travel. In this paper I show that Miller’s conclusion is based on a hidden assumption which, while generally plausible, is unwarranted if time travel is possible. Branching time is, after all, compatible with time travel as Miller characterises it.
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NOVELLO, M., N. F. SVAITER, and M. E. X. GUIMARÃES. "BACKWARDS TIME-TRAVEL INDUCED BY COMBINED MAGNETIC AND GRAVITATIONAL FIELDS." Modern Physics Letters A 07, no. 05 (February 20, 1992): 381–86. http://dx.doi.org/10.1142/s021773239200032x.

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In this work, we analyze the behavior of a macroscopic particle submitted to combined magnetic and gravitational fields on Gödel’s Universe. The examination is made in a local Gaussian system of coordinates.
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Smith, Nicholas J. J. "I’D DO ANYTHING TO CHANGE THE PAST (BUT I CANT DO "THAT")." American Philosophical Quarterly 54, no. 2 (April 1, 2017): 153–68. http://dx.doi.org/10.2307/44982133.

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Abstract This paper addresses a worry about backwards time travel. The worry is that there is something mysteriously inexplicable about the combination of commonplace events that will inevitably conspire to prevent the time traveler from doing something impossible such as killing her younger self. The worry is first distinguished from other problems for backwards time travel concerning its alleged impossibility or improbability. It is then shown that the worry is misplaced: there is in fact no real problem here. Yet the worry has been widely expressed—so a suggestion is also made as to why it is so easy to get into the position of thinking that there is a genuine problem here, when in fact there is not. Finally, in light of the resolution of the inexplicability worry, a new way of dealing with the other two problems for backwards time travel—concerning its alleged impossibility and improbability—is proposed.
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Dowe, Phil. "Does Lewis’ Theory of Causation Permit Time Travel?" Philosophies 6, no. 4 (November 23, 2021): 94. http://dx.doi.org/10.3390/philosophies6040094.

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David Lewis aimed to give an account of causation, and in particular, a semantics for the counterfactuals to which his account appeals, that is compatible with backwards causation and time travel. I will argue that he failed, but not for the reasons that have been offered to date, specifically by Collins, Hall and Paul and by Wasserman. This is significant not the least because Lewis’ theory of causation was the most influential theory over the last quarter of the 20th century; and moreover, Lewis’ spirited defence of time travel in the 1970s has shaped philosophers’ approach to time travel to this day.
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Ansuini, Caterina, Andrea Cavallo, Lorenzo Pia, and Cristina Becchio. "The Role of Perspective in Mental Time Travel." Neural Plasticity 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/3052741.

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Recent years have seen accumulating evidence for the proposition that people process time by mapping it onto a linear spatial representation and automatically “project” themselves on an imaginedmental time line. Here, we ask whether people can adopt the temporal perspective of another person when travelling through time. To elucidate similarities and differences between time travelling from one’s own perspective or from the perspective of another person, we asked participants to mentally project themselves or someone else (i.e., a coexperimenter) to different time points. Three basic properties of mental time travel were manipulated: temporal location (i.e., where in time the travel originates: past, present, and future), motion direction (either backwards or forwards), and temporal duration (i.e., the distance to travel: one, three, or five years). We found that time travels originating in the present lasted longer in the self- than in the other-perspective. Moreover, for self-perspective, but not for other-perspective, time was differently scaled depending on where in time the travel originated. In contrast, when considering the direction and the duration of time travelling, no dissimilarities between the self- and the other-perspective emerged. These results suggest that self- and other-projection, despite some differences, share important similarities in structure.
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Leslie, John. "The Reality of the Future." Dialogue 29, no. 3 (1990): 441–46. http://dx.doi.org/10.1017/s0012217300013172.

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This book would better have been called Backward Causation. For its central purposes, the reason for wanting the future to be real is that it must be real if it is to affect the present (see p. 12). Backward causation might be essential to the precognitions reported by paranormal psychologists (p. 20). Philosophers, too, might want it for giving power to Newcomb's Paradox (p. 42–45) in which the presence of a superbly efficient Predictor could discourage what would otherwise be evidently rational behaviour. Again, Time Machines (p. 226–237) and Ray Guns fired into the Past (p. 30f.) have attracted philosophical attention. Finally, and of more interest to Faye, physicists have published hundreds of papers speculating about advanced particles and tachyons. Advanced particles (Chapter 7) are conceived as moving backwards in time. Tachyons (Chapter 8) travel faster than light, which means that at least some observers will be inclined to view their temporal progress as backwards.
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Poidevin, Robin Le. "The Cheshire Cat Problem and Other Spatial Obstacles to Backwards Time Travel." Monist 88, no. 3 (2005): 336–52. http://dx.doi.org/10.5840/monist200588318.

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HO, CHIU MAN, and THOMAS J. WEILER. "PHYSICAL AND STABLE CLOSED TIME-LIKE CURVES." Modern Physics Letters A 28, no. 01 (January 8, 2013): 1250237. http://dx.doi.org/10.1142/s0217732312502379.

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We construct a class of closed time-like curves (CTCs) using a compactified extra dimension u. A nonzero metric element gtu(u) enables particles to travel backwards in global time t. The compactified dimension guarantees that the geodesic curve closes in u. The effective 2D (t and u) nature of the metric ensures that spacetime is flat, therein satisfying all the classical stability conditions as expressed by the energy conditions. Finally, stationarity of the metric guarantees that a particle's energy is conserved. The pathologies that plague many hypothesized metrics admitting CTCs, e.g., an infinite cylinder of matter, a negative energy-distribution, particle acceleration/blue-shifting along the CTC, do not occur within our metric class.
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Dissertations / Theses on the topic "Backwards time travel"

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Jawa, Ishan. "Dissecting The Grandfather Paradox." Scholarship @ Claremont, 2018. http://scholarship.claremont.edu/cmc_theses/1763.

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In his paper, The Paradoxes of Time Travel, David Lewis posits a defense for the possibility of time travel by arguing that the grandfather 'paradox' is not, in fact, paradoxical at all. Two alternative solutions to the grandfather paradox are discussed in this paper. The first is a result of Paul Horwich’s reply to Lewis and aims to pit the Lewisian conception of compatibility against Horwich’s improbability defense. Proposed by Nicholas Smith and C.G. Goddu, this theory explains that any attempt at backward time travel will lead to the creation of long strings of improbable coincidences. An alternative thesis of the multiverse is also discussed, wherein it was proposed that instead of traveling into his past, the time traveler enters an alternate, yet completely identical universe. The multiverse thesis did not stand up to any philosophical critique, and it was posited that the thesis changes the nature of the question entirely. It is evident that Lewis’ discussion of the grandfather paradox raises several fundamentally interesting philosophical questions regarding the logical and causal irregularities of changing the past. This paper aims to adress some of these questions through a metaphysical analysis of Lewis' view, backwards causality, and the nature of time itself.
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Madfors, Ingela. "Backward time travel and its relevance for theological study : An explorative literature study based on physics, philosophy, counterfactual thinking and theology." Thesis, Högskolan i Gävle, Akademin för utbildning och ekonomi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-8533.

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This paper explores the possibility and relevance of theological study of backward time travel and its consequences. An examination of current research on backward time travel reveals a number of interdisciplinary topics which are not handled within physics. Some of these topics, mainly concerning free will and determination, are of interest to philosophers, whereas topics such as meaning and responsibility are left aside.   In theology, there is a general dismissal of the idea of backward time travel. This study claims that this negative stance may be the result of taking science and its methods too seriously. The result of the study is that the interdisciplinary questions connected to backward time travel makes the subject very relevant for theological reflection. Thought experiments on backward time travel can provide valuable insights on how we deal with our lives, our world, time, and God today.
Denna explorativa studie utforskar möjligheten och relevansen av teologiska studier av tidsresor till det förflutna och deras konsekvenser. En undersökning av det aktuella forskningsläget visar på förekomsten av interdisciplinära frågeställningar som inte hanteras inom fysiken. Vissa frågor, framförallt knutna till den fria viljan och determinism, intresserar filosofer, medan andra områden som mening och ansvar inte behandlas vidare. Teologer ställer sig generellt negativa till tanken på resor till det förflutna. Denna studie hävdar att denna negativa inställning kan vara resultatet av en alltför stark respekt för vetenskapens fynd och metoder.  Resultatet av studien är att de interdisciplinära frågeställningar som är kopplade till tidsresor till det förflutna gör ämnet högst lämpligt för teologisk begrundan. Tankeexperiment kring ämnet kan ge värdefulla insikter om hur vi hanterar våra liv, vår värld, tiden och Gud idag.
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Micklethwait, Guy Roland. "Models of Time Travel: a comparative study using films." Phd thesis, 2012. http://hdl.handle.net/1885/9486.

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This research identifies the way the science of time travel is presented to the public through the medium of feature films, and discovers if this can be used to construct a comprehensive set of models about time travel and its consequences. There is no universally accepted understanding of what constitutes the nature of time. Even though the fundamental laws of physics do not prohibit time travel, scientists and philosophers do not agree about what would happen if backwards time travel ever became a reality. I identified models that scientists and philosophers have produced about the nature of time, time travel and other temporal phenomena. I then determined the model of time used in each of the 100 time travel films that I reviewed. I also used a verbal survey to elicit the personal models of time travel for each participant of three focus groups I conducted with members of the movie-going public. I compared these models of time with the personal models used by members of the movie-going public and synthesised them to develop a comprehensive set of 21 models of time. The "guyline" diagrams that I devised proved to be a very useful tool for analysing how the timelines of the time travellers behaved in each film. My research has shown that an investigation of time travel in films can indeed be used to construct useful models of time based on the evidence of the 21 models that I developed. Furthermore, I showed that both my models of time travel and my guyline diagrams helped to structure conversations about time with members of the movie-going public. The findings of this thesis can be used by scientists, philosophers, filmmakers and the public to help them clarify our thinking about time travel, the nature of time, how it is communicated, and also in future research.
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飯田, 孝夫, 純. 森泉, 和久 小村, 勝廣 吉岡, and 潤信 金. "東アジアにおける大気汚染物質の挙動解明を目的とした自然放射能ラドンの同時測定." 2000. http://hdl.handle.net/2237/13088.

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Books on the topic "Backwards time travel"

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Houghton, Eric. The backwards watch. New York: Orchard Books, 1992.

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Lomax, David. Backward glass. Woodbury, Minnesota: Flux, 2013.

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Edward, Bellamy. Looking backward. New York: Dover Publications, 1996.

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Edward, Bellamy. Looking backward: 2000-1887. New York: Signet Classic, 2000.

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Bellamy, Edward. Looking backward, 2000-1887. New York, N.Y: Signet Classics, 2009.

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Edward, Bellamy. Looking backward, 2000-1887. New York, N.Y: Signet Classics, 2009.

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Edward, Bellamy. Looking backward, 2000-1887. Toronto: W. Bryce, 1987.

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Bellamy, Edward. Looking backward, 2000-1887. Indianapolis: Cork Hill Press, 2003.

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Edward, Bellamy. Looking backward, 2000-1887. Peterborough, Ont: Broadview Press, 2003.

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Edward, Bellamy. Looking backward, 2000-1887. New York, N.Y: Penguin Books, 1986.

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Book chapters on the topic "Backwards time travel"

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McNeill, Fergus, Phil Crockett Thomas, Lucy Cathcart Frödén, Jo Collinson Scott, Oliver Escobar, and Alison Urie. "Time After Time: Imprisonment, Re-entry and Enduring Temporariness." In Time and Punishment, 171–201. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-12108-1_7.

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AbstractThis chapter aims to address the scant attention that has been paid to time and temporalities in re-entry and re/integration research. Drawing on data from the ‘Distant Voices—Coming Home’ project, which used creative methods to explore re/integration after punishment—we illustrate and analyse three ‘travails’ of penal time. We use the term travails here to stress the significant, difficult and active work involved in addressing these temporal challenges. Respectively, these travails concern the struggles caused by ‘de-synchrony’ between time inside and outside of prison and the problems of ‘re-synchrony’ that it creates; the contestation of ‘readiness’ for progression and release; and the problem of living with the paradox of ‘enduring temporariness’. In our conclusion, we argue that tackling these three challenges requires people re-entering society to travel not just through spaces and to places but also through time, both backwards and forwards. These journeys are fraught with both difficulty and danger.
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Effingham, Nikk. "The Double Occupancy Problem." In Time Travel, 51–58. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198842507.003.0005.

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Imagine a time machine travels back in time in the same way it persists into the future (i.e. by persisting backwards). For instance, this is how time machines move through time in H.G. Wells’s The Time Machine. Such a machine would have a problem: immediately upon moving back in time it would collide with its earlier self. This is the ‘Double Occupancy Problem’. Using the notions introduced in Chapters 1–3, this chapter explains how to avoid this ‘Double Occupancy Problem’: such time machines can travel back in time just as long as they are both in motion and move back in time bit by bit.
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Light, Alison. "Introduction: Reading Oneself Backwards." In Alison Light - Inside History, 1–16. Edinburgh University Press, 2021. http://dx.doi.org/10.3366/edinburgh/9781474481557.003.0001.

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An introduction like this one, looking back over nearly thirty-five years of work, is bound to be deceptive. Thought does not travel in a straight line; ideas are seeded and gestate or lie dormant for decades; others fall by the wayside or on stony ground. Work is always work in progress. Realising too, as I get older, how much I am always ‘inside history’, has meant acknowledging that my work, however much it feels original, is also representative, forged in the crucible of time, fashioned in a culture and a place, owing much to others. One’s self is only ever known in social relations and such relations, like time, do not stand still. ‘I’ am a crowd. If the self is a kind of flow, the knowledge of one’s own historicity, accrues like silt....
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Ford, Sarah Gilbreath. "Claiming the Property of History in Octavia Butler’s Kindred and Natasha Trethewey’s Native Guard." In Haunted Property, 154–90. University Press of Mississippi, 2020. http://dx.doi.org/10.14325/mississippi/9781496829696.003.0006.

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This chapter examines Octavia Butler’s Kindred (1979), a postmodern novel involving a woman from 1976 traveling back through time to the nineteenth-century world of slavery, and Natasha Trethewey’s Native Guard (2006), a poetry collection focusing on the death of Trethewey’s mother and the forgotten history of black Union soldiers stationed at Ship Island, Mississippi, during the Civil War. Both texts show the haunting caused by the conflation of people with property, and both reverse the direction of this haunting to show the present haunting the past. This chapter argues that these narratives not only reveal that slavery haunts us; they expose how we haunt slavery. Through the haunting backwards allowed by time travel, the authors claim the property of history, a claim that rewrites the paradigm of power in slavery.
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Giles, Paul. "Organicist Time." In Backgazing: Reverse Time in Modernist Culture, 149–98. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198830443.003.0004.

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This chapter traces how an organicist version of time was developed during the interwar period, how it reached its philosophical apogee in the work of Martin Heidegger and was treated sympathetically by American novelist Thomas Wolfe. However, this organicist impulse was kept at a distance by the writing of Theodor Adorno, Thomas Mann, and H. G. Wells, all of whom engage in dialectics with fascism. This chapter also considers how organicist models of temporal sequence inform the fixation on time in William Faulkner’s fiction, and how Sartre’s existentialism attempted to disavow what he saw as Faulkner’s backward-looking nostalgia. This kind of organicist imagination continued to resonate widely even after 1945, as we see from Anthony Powell’s sequence of novels A Dance to the Music of Time, and organicist time formed an integral backbone to many dimensions of modernist culture, even if its visibility became partially suppressed after World War II.
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Miklitsch, Robert. "Odds against Tomorrow." In I Died a Million Times, 218–32. University of Illinois Press, 2020. http://dx.doi.org/10.5622/illinois/9780252043611.003.0010.

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In Odds against Tomorrow (1959), the relation between crime thriller and social commentary in Robert Wise’s film can be said to turn the generic glove inside out so that the heist picture becomes a vehicle for social protest. Unlike The Defiant Ones (1957), in which the positive social message is compromised by its ultimately regressive take on the prison picture, the apocalyptic, seemingly nihilistic conclusion of Odds against Tomorrow represents a negative critique of both the heist and social-problem picture. From this dual point of view, Wise’s film may be said to be what Jonathan Munby calls a “civil rights noir,” an oxymoron that points to the limits of the classic social-problem film even as it points up the latent utopianism of the heist picture. Unlike the conclusion of The Asphalt Jungle, which looks backward to the nation’s agrarian past, the ending of Odds against Tomorrow evokes the lunar landscape and, by implication, the promise of the “new frontier”--of space travel and civil rights in the oppressive face of ignorance and prejudice.
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Sheppard, W. Anthony. "Introduction." In Sondheim in Our Time and His, 1–12. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780197603192.003.0001.

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The song “Our Time” occupies a peculiar Janus-faced position in Sondheim’s 1981Merrily We Roll Along. Three aspiring artists—Frank, Charley, and Mary—gaze at the night sky in wonder as Sputnik orbits the Earth in October 1957. The lyrics are focused both on this exciting present moment and on the promise of a bright future, and they speak of an energy and change that can be heard: “Something is stirring, / Shifting ground. / It’s just begun”; “Hear what’s happening.” The lyrics are packed with invigorating alliteration, rhyme, and word repetition, pushing the song forward. Similarly, the strong, incessant bacchius (short-long-long) musical rhythm in the chorus section is assertive and optimistic. And yet we hear this song at the very end of the musical—or, in the original production, at the penultimate moment—after having traveled backward from 1980 through the lives of these three characters. In fact, as they sing of their promising futures, we cannot avoid looking back ourselves to the opening scenes of the show, in which we learn just how fraught and compromised their adult lives actually turned out to be....
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Heunen, Chris, and Jamie Vicary. "Dual Objects." In Categories for Quantum Theory, 89–126. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198739623.003.0003.

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Dual objects are abstract categorical structures that represent the quantum notion of entanglement. We prove a range of important results about dual objects and show how to use them to model quantum teleportation. Dual objects have an important topological representation, in terms of wires bending ‘backwards in time’, and we use this to characterize different sorts of duality structures, including pivotal, ribbon and compact structures. Dual objects interact well with any linear structure available, allowing us to capture linear-algebraic properties such as trace and dimension.
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Grove, Kevin G. "The Work of Remembering." In Augustine on Memory, 112–40. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780197587218.003.0005.

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Chapter 4 explores how broken human memories might be healed in the whole Christ. The work of remembering is out of the self and into the whole. The chapter explores remembering backward in time—through Augustinian confession, festivals of abiding traces, and the bread of memory—as well as forward in time, in hope and in mourning, by remembering Jerusalem’s songs and Sabbath rest. The work of remembering builds to the thesis that “remembering together” comprises Christian existence for Augustine. The chapter distinguishes Christic from collective memory. Chapter 4 is the first of a two-chapter binary: the work of remembering and the work of forgetting (chapter 5).
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Mann, Jenny C. "Meandering." In The Trials of Orpheus, 33–68. Princeton University Press, 2021. http://dx.doi.org/10.23943/princeton/9780691219226.003.0002.

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This chapter employs the figurative motions of the meander, a line that must move backward in order to travel forward, to track the presence of the Greek sublime in early modern English poetry and poetic theory. The backward turn is the paradigmatic gesture of the Orpheus myth: Orpheus's fatal turn back returns Eurydice to the Underworld and also becomes a sign of the persuasive force of Orphic song. The chapter highlights that the figure of the meander appears in the poetry of both Virgil and Ovid and also frames multiple Romano-British Orpheus mosaics. It then demonstrates how the meander expresses the time-bending power of the Orpheus myth, which reverses cause and effect in its symbolic depiction of literary transmission. The chapter argues that Sappho is the “transumed,” or hidden, link that joins Orpheus to Ovid in the text of the Metamorphoses and enables the construction of a literary genealogy that connects ancient Greece to Augustan Rome to early modern England. Ovid's tale of Orpheus passes through Sappho so as to transmit what Longinus terms the “nervous force” of the sublime to readers of the Metamorphoses. It then considers how these transumptions transform these poets into instruments for the transmission of literary history.
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Conference papers on the topic "Backwards time travel"

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Gan, Jiaye, Hong-sik Im, Daniel Espinal, Alexis Lefebvre, and Ge-Cheng Zha. "Investigation of a Compressor Rotor Non-Synchronous Vibration With and Without Fluid-Structure Interaction." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26478.

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This paper study the non-synchronous vibration (NSV) of a high speed multistage axial compressor using rigid blade and vibrating blade with fluid-structural interaction (FSI). The unsteady Reynolds-averaged Navier-Stokes (URANS) equations and mode based structural dynamic equations are solved. A low diffusion E-CUSP Reimann solver with a 3rd order WENO scheme for the inviscid fluxes and a 2nd order central differencing for the viscous terms are employed. A 1/7th annulus sector of IGV-rotor-stator is used with a time shifted phase lag BC at circumferential boundaries. An interpolation sliding boundary condition is used for the rotor-stator interaction. The URANS simulation for rigid blades shows that the leading edge (LE) tornado vortices, roughly above 80% rotor span, travel backwards relative to the rotor rotation and cause an excitation with the frequency agreeing with the measured NSV frequency. The predicted excitation frequency of the traveling vortices in the rigid blade simulation is a non-engine order frequency of 2603 Hz, which agrees very well with the NSV rig testing. For the FSI simulation, the results show that there exist two dominant frequencies in the spectrum of the blade vibration. The lower dominant frequency is close to the first bending mode. The higher dominant frequency close to the first torsional mode agrees very well with the measured NSV frequency. The simulation conducted in this paper appears to indicate that the NSV is excited by the traveling vortex.
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Cheng, Eric, Ali Ahmadi, and Karen C. Cheung. "Investigation of the Hydrodynamics of Suspended Cells for Reliable Inkjet Cell Printing." In ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icnmm2014-21583.

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Reliable inkjet drop-on-demand dispensing of cells has numerous applications including cell assays and tissue engineering. Previous work on inkjet cell printing has demonstrated that the cell count per droplet is inhomogeneous and does not follow the expected Poisson distribution. In the present work, the flow-induced cell behaviour is characterised to better understand the hydrodynamic mechanisms behind unreliable cell printing. A glass piezoelectric inkjet nozzle with an 80 μm diameter orifice is mounted on a PDMS cast which acts as a refractive index matching material for cell tracking through an inverted microscope. Droplet formation is achieved by a bipolar waveform. A high-speed camera focused on the centre plane of the nozzle captures images which are then analysed by a cell tracking algorithm to obtain the horizontal and vertical position of the cells over time. High-speed tracking of cells within a transparent inkjet nozzle revealed three possible cell behaviours caused by the formation and break-off of droplets. These behaviours are cell travel, cell ejection and cell reflection, determined as a function of the position of the cell at the onset of droplet formation. The first behaviour, cell travel, is characterised as the displacement of the cell towards the orifice during droplet formation followed by a small backwards motion due to the retracting meniscus after droplet pinch-off. Cell travel results in a net forward displacement of the cell towards the nozzle orifice. The second observed cell behaviour is cell ejection, where a cell is ejected with a droplet and can no longer be observed within the nozzle after the droplet break-off. The third observed cell behaviour is cell reflection. In this case, hydrodynamic forces produced during droplet ejection acts on the cell to move it further away from the nozzle orifice resulting in a net displacement of the cell away from the orifice after droplet ejection. Through the cell tracking information, it is hypothesized that cell reflection is caused by fluid flow reversal during the droplet ejection process. As a result of cell reflection, certain cells within a region close to the orifice will not be printed; instead they are pushed to a location further away from the orifice. Therefore, mapping of cell positions before droplet formation is performed to identify regions within the nozzle that exhibit a high probability of cell ejection and reflection. Overall, the results from this study will greatly contribute to our understanding of the cell printing process, which will allow us to optimize current inkjet systems for cell printing applications.
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Lin, Yi-Ting, Wen-Chi Shiue, and Ing-Jer Huang. "A multi-resolution AHB bus tracer for real-time compression of forward/backward traces in a circular buffer." In the 45th annual conference. New York, New York, USA: ACM Press, 2008. http://dx.doi.org/10.1145/1391469.1391687.

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Iqbal, Junaid, Dragos Truscan, Jüri Vain, and Ivan Porres. "Reconstructing timed symbolic traces from rtioco -based timed test sequences using backward-induction." In ECBS '17: Fifth European Conference on the Engineering of Computer Based Systems. New York, NY, USA: ACM, 2017. http://dx.doi.org/10.1145/3123779.3123813.

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Spakovsky, Z. S. "Backward Traveling Rotating Stall Waves in Centrifugal Compressors." In ASME Turbo Expo 2002: Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30379.

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Rotating stall waves that travel against the direction of rotor rotation are reported for the first time and a new, low-order analytical approach to model centrifugal compressor stability is introduced. The model is capable of dealing with unsteady radially swirling flows and the dynamic effects of impeller-diffuser component interaction as it occurs in centrifugal compression systems. A simple coupling criterion is developed from first principles to explain the interaction mechanism important for system stability. The model findings together with experimental data explain the mechanism for first-ever observed backward traveling rotating stall in centrifugal compressors with vaned diffusers. Based on the low-order model predictions, an air injection scheme between the impeller and the vaned diffuser is designed for the NASA Glenn CC3 high-speed centrifugal compressor. The steady air injection experiments show an increase of 25% in surge-margin with an injection mass flow of 0.5% of the compressor mass flow. In addition, it is experimentally demonstrated that this injection scheme is robust to impeller tip-clearance effects and that a reduced number of injectors can be applied for similar gains in surge-margin. The results presented in this paper firmly establish the connection between the experimentally observed dynamic phenomena in the NASA CC3 centrifugal compressor and a first principles based coupling criterion. In addition, guidelines are given for the design of centrifugal compressors with enhanced stability.
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Adachi, Kazuhiko, and Syota Horiuchi. "Improvement of Impact Identification Capability of Time Reversal Processing Using Experimentally Measured Surface Bonded PZT Sensor Signals." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41584.

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In this study, the effect of time duration of the measured sensor signal to the impact identification capability of time reversal processing method is experimentally demonstrated. Time reversal processing for the measured sensor signal can be applied to detect not only structural damage but also impact loading of the structure. After measuring the electrical sensor signals corresponding to scattered wave filed of the plate experimentally, time reversal processing is applied to the measured signals in the numerical wave back propagation simulation for localizing the impact loading point on the plate. A time-reversed wave travels back through the plate and is focused on the region around a point where hits by the impact hammer. The illustrative experimental and numerical processes demonstrated the impact identification capability of time reversal processing method. Even if the measured signals were missing the wave front induced by the impact, the signal to noise ratio of the backward process was successfully improved by using the long time duration of the measured sensor signals.
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Koeman, Vincent J., Koen V. Hindriks, and Catholijn M. Jonker. "Omniscient Debugging for Cognitive Agent Programs." In Twenty-Sixth International Joint Conference on Artificial Intelligence. California: International Joint Conferences on Artificial Intelligence Organization, 2017. http://dx.doi.org/10.24963/ijcai.2017/38.

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For real-time programs reproducing a bug by rerunning the system is likely to fail, making fault localization a time-consuming process. Omniscient debugging is a technique that stores each run in such a way that it supports going backwards in time. However, the overhead of existing omniscient debugging implementations for languages like Java is so large that it cannot be effectively used in practice. In this paper, we show that for agent-oriented programming practical omniscient debugging is possible. We design a tracing mechanism for efficiently storing and exploring agent program runs. We are the first to demonstrate that this mechanism does not affect program runs by empirically establishing that the same tests succeed or fail. Usability is supported by a trace visualization method aimed at more effectively locating faults in agent programs.
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Khalimov, R. R., Dmitri Dmitrievich Zhdanov, and Andrei Dmitrievich Zhdanov. "Creation of an Effective Spatial Structure of Photon Maps to Speed up the Rendering Process." In 32nd International Conference on Computer Graphics and Vision. Keldysh Institute of Applied Mathematics, 2022. http://dx.doi.org/10.20948/graphicon-2022-110-123.

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The analysis of realistic rendering methods from the point of view of the efficiency of calculation of secondary and caustic illumination is carried out. A method of bidirectional stochastic ray tracing using photonic maps is proposed, which ensures high efficiency of calculation of caustic illumination. The main approaches of using the photon maps method are considered: the construction of photon maps on the traces of forward rays and on the traces of backward rays. The advantages and disadvantages of these methods are revealed. The method of bidirectional stochastic ray tracing using backward photon maps is chosen as the basic solution. Profiling of this solution was carried out based on the Lumicept software package. The main problems associated with slowing down the rendering process have been identified. For most scenes, half of the rendering time was spent processing requests to the photon map: searching for nearby photons within the cell of the spatial structure and searching for the intersection of the ray with the integrating photon spheres. Several solutions for spatial partitioning of photonic maps were analyzed: a regular mesh, a regular mesh with a hash table and a binary tree. The advantages and disadvantages of the solutions under consideration are revealed and a combined solution is proposed that combines the adaptability of splitting a binary tree and the access efficiency provided by hash tables. A combined solution has been implemented in the Lumicept software package, which will increase the overall rendering efficiency by 30%.
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Almajid, Muhammad Majid, and Anthony R. Kovscek. "Experimental Investigation of Transient Foam Flow in a Long Heterogeneous Consolidated Sandstone." In SPE Improved Oil Recovery Conference. SPE, 2022. http://dx.doi.org/10.2118/209401-ms.

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Abstract Transient N2-foam flow experiments were conducted in a heterogeneous sandstone core to improve our understanding of how foam flows in these complex systems. An apparatus with an aluminum core holder and a medical x-ray CT scanner was built to measure the aqueous-phase saturation nondestructively. Pressure readings along the length of the core, were recorded using six pressure taps drilled into the core. We coinjected the foamer solution and the gas at the core's inlet and allowed foam generation to occur inside the core. Measurements of the aqueous-phase saturation and of the pressure at various times enabled us to track and analyze the transient foam behavior in the core. Three foam qualities were tested ranging from low quality (gas fractional flow) of 33% to high quality of 90%. Results show that gas initially drains the core and forms weak foam before crossing a permeability discontinuity present in the core. The travel distance from the inlet until the point of entrance into the permeability discontinuity was inversely proportional to the water content of the foam. Wetter foams required a shorter distance before the gas entered the low-permeability layer. Crossing the permeability discontinuity, the weak foam became stronger as evidenced by the drop in aqueous-phase saturation and the increase in the pressure gradient. Once strong foam was generated, it traveled to the outlet in a piston-like fashion. After it breaks through the outlet, a second front appears to be traveling backward toward the inlet against the direction of flow. Diversion to lower-permeability layers occurs during this second front movement. This observation was validated qualitatively by a simple pore network model that is equipped with the invasion percolation with memory algorithm. The results of the network show the diversion occurring once strong foam generates in the high-permeability zone and explain the discontinuous aqueous-phase saturation observed during the first foam front movement.
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Kang, Dong Jin, Sang Soo Bae, and Jae Won Kim. "Navier-Stokes Simulation of the MIT Flapping Foil Experiment Using an Unstructured Finite Volume Method." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-214.

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A Navier-Stokes simulation of the MIT flapping foil experiment is presented. The MIT experiment was designed to provide a good quality database for unsteady boundary layer flows. The unsteady boundary layer around a hydrofoil was generated by flapping two airfoils upstream of the hydrofoil. Present Navier-Stokes simulation is carried out on the entire experimental domain, including the flapping airfoils as well as the downstream fixed hydrofoil. Present Navier-Stokes code uses an unstructured finite volume method based on the SIMPLE algorithm. It uses QUICK scheme for the convective terms and the second order Euler backward differencing for time derivatives to keep second order accuracy spatially and temporally. All other spatial derivatives are approximated by using central difference scheme. All comparisons of present time averaged and unsteady solutions with the corresponding experimental data are satisfactory: all unsteady solutions are compared in terms of time mean and first harmonic. The first harmonic of the velocity shows a peak inside the boundary layer along the surfaces of the hydrofoil and has a local minimum near the edge of the boundary layer. The local minimum becomes manifest as the boundary layer grows. The unsteadiness in the free stream is transferred inside the boundary layer when an unsteady vortex impinges on the surface. The entrained unsteadiness travels with a local velocity slower than that in the free stream. This causes phase lag of the first harmonic between the free stream and the boundary layer and local minimum of the first harmonic near the edge of the boundary layer.
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