Relevant bibliographies by topics / Flashback

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

Academic literature on the topic 'Flashback'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 July 2024

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Journal articles on the topic "Flashback"

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Wu, Hui-Yin, Michael Young, and Marc Christie. "A Cognitive-Based Model of Flashbacks for Computational Narratives." Proceedings of the AAAI Conference on Artificial Intelligence and Interactive Digital Entertainment 12, no. 1 (June 25, 2021): 239–45. http://dx.doi.org/10.1609/aiide.v12i1.12873.

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The flashback is a well-known storytelling device used to invoke surprise, suspense, or fill in missing details in a story. Film literature provides a deeper and more complex grounding of flashbacks by explaining their role to stimulate the viewer's memory in order to guide and change viewer comprehension. Yet, in adapting flashback mechanisms to AI storytelling systems, existing approaches have not fully modelled the roles of a flashback event on the viewer's comprehension and memory. To expand the scope of AI generated stories, we propose a formal definition of flashbacks based on the identification of four different impacts on the viewer's beliefs. We then establish a cognitive model that can predict how viewers would perceive a flashback event. We finally design a user-evaluation to demonstrate that our model correctly predicts the effects of different flashbacks. This opens great opportunities for creating compelling and temporally complex interactive narratives grounded on cognitive models.
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Bourne, C., C. E. Mackay, and E. A. Holmes. "The neural basis of flashback formation: the impact of viewing trauma." Psychological Medicine 43, no. 7 (October 18, 2012): 1521–32. http://dx.doi.org/10.1017/s0033291712002358.

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BackgroundPsychological traumatic events, such as war or road traffic accidents, are widespread. A small but significant proportion of survivors develop post-traumatic stress disorder (PTSD). Distressing, sensory-based involuntary memories of trauma (henceforth ‘flashbacks’) are the hallmark symptom of PTSD. Understanding the development of flashbacks may aid their prevention. This work is the first to combine the trauma film paradigm (as an experimental analogue for flashback development) with neuroimaging to investigate the neural basis of flashback aetiology. We investigated the hypothesis that involuntary recall of trauma (flashback) is determined during the original event encoding.MethodA total of 22 healthy volunteers viewed a traumatic film whilst undergoing functional magnetic resonance imaging (fMRI). They kept a 1-week diary to record flashbacks to specific film scenes. Using a novel prospective fMRI design, we compared brain activation for those film scenes that subsequently induced flashbacks with both non-traumatic control scenes and scenes with traumatic content that did not elicit flashbacks (‘potentials’).ResultsEncoding of scenes that later caused flashbacks was associated with widespread increases in activation, including in the amygdala, striatum, rostral anterior cingulate cortex, thalamus and ventral occipital cortex. The left inferior frontal gyrus and bilateral middle temporal gyrus also exhibited increased activation but only relative to ‘potentials’. Thus, these latter regions appeared to distinguish between traumatic content that subsequently flashed back and comparable content that did not.ConclusionsResults provide the first prospective evidence that the brain behaves differently whilst experiencing emotional events that will subsequently become involuntary memories – flashbacks. Understanding the neural basis of analogue flashback memory formation may aid the development of treatment interventions for this PTSD feature.
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Syropyatov, O. G., N. О. Dzeruzhynska, and К. Yu Marushchenko. "Flashback psychopathology in combatants with PTSD." Archives of psychiatry 25, no. 2 (June 19, 2019): 115–17. http://dx.doi.org/10.37822/2410-7484.2019.25.2.115-117.

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Background. Flashback is an artistic technique, primarily in cinema, with a temporary interruption of the narrative sequence in order to show some events in the past. In General psychopathology, flashback is an involuntary and unpredictable revival of traumatic experience through extraordinarily vivid memories lasting from a few seconds to several hours, during which veterans feel that a terrible reality from the past invades their real life. Subjectively, patients describe these conditions in the following phenomena: “war is in the eyes”, “I am here and not here”, scenes of death of a friend, scenes of violence. The boundaries between “that” and actual reality are blurred. Flashbacks are also observed when psychoactive substances are used – hallucinogens and stimulants, as well as alcohol. In narcology by flashback the occurrence of symptoms of intoxication after drug use cessation is meant. Flashbacks are also described in right-sided temporal lobe epilepsy, brain tumors, and other organic brain lesions. The literature suggests that flashbacks are a coping mechanism for coping with stress. At the same time, direct or symbolic reflection of the psychotrauma pattern in the content of recurrent memories is one of the main symptoms of diagnosis of psychogenic mental disorders. Wider psychopathological idea of the flashback evidence of nosological non-specificity of this phenomenon (Voloshin V. M., 2005; Alexander Yu. A., 2008; Zhmurov V. A., 2008; Krylov V. I., 2015). The diagnostic criteria for PTSD in ICD-10 do not distinguish flashback episodes from other mental disorders. In DSM-5, the flashback phenomenon is qualified as a dissociative episode and is considered along with reminiscences, illusions, hallucinations, meaningfully associated with recurrent experiences of psychotraumatic experiences, and is a diagnostic feature. Objective. The aim of the study was to investigate clinical and psychopathological features of flashbacks in the structure of PTSD in combatant soldiers. Materials and methods. Clinical follow-up examination of soldiers-combatants was conducted. With the system approach, we examined and selected according to the inclusion criteria 48combatants-servicemenof Armed Forces of Ukraine, males aged 31±0.7 years using the following study algorithm: 1) all respondents – combatants were tested using the Luscher test to screen for emotional disorders; 2) in the selected group of respondents with emotional disorders, a clinical and psychopathological study was further conducted with the additional use of the symptomatic questionnaire SCL-90-R (The Symptom Checklist-90-Revised) to clarify the main and additional symptoms of PTSD and comorbid psychopathological symptoms. Results. A study using ICD-11 revealed signs of PTSD in examined combatants. It is a disorder that develops after exposure to an extreme threatening or terrifying event or series of events, and is characterized by three “pivotal” manifestations: re-experiencing the traumatic event(s) at the present time in the form of vivid intrusive memories accompanied by fear or horror, flashbacks or nightmares; avoidance of thoughts and memories of the event, or avoidance of activities or situations that reminiscent of the event; a state of subjective sense of continuing threat in the form of hyper-alertness or increased reactions of fright. The revealed profile of symptoms was accompanied by additional permanent and widespread and persistent derangements of regulation, self-assessment and interpersonal functioning. For all combatants surveyed, a new diagnostic category of ICD-11 “Complex PTSD” was used. As noted by V. I. Krylov (2015), the symptoms of re-experiencing (flashbacks) are characterized by two main rows – obsessive and overvalued experiences. We also highlighted the different phenomenology of flashbacks, which have the following differences. First, the obsessive nature of reminiscences is observed in those memories that the patient wants to forget, the leading value in this case is the content of memories. Second, for intrusive ideas the focus is on intense affective images and pictures of psychotraumatic events. Third, retrospective self-analysis of the correctness of their behavior in a psychotraumatic situation has a leading place in obsessive doubts. Fourth, overvalued memories and views from the beginning are arbitrarily and are supported by “brothers in arms”. Overvalued experiences are egosyntonic and identify with personality. The opposite view of the aims and meaning of war causes aggression. “Heroization” of their behavior in military conditions takes place. Fifth, nightmares with scenes of war that end in awakenings or sleep inertia states with disorientation in place and time can be accompanied by aggressive actions. On the basis of phenomenological psychopathological analysis the main characteristics of the phenomenon of flashback were derived: 1) reflection of combat trauma in the content of re-experiencing; 2) spontaneous involuntary occurrence of re-experiencing without external provocation; 3) sensual richness of re-experiencing – visual images of flashback have a bright polychromatic character, auditory images are expressed, olfactory disorders are associated with combat experience (the smell of gunpowder, burning, blood); images of recurrent memories have a complete “military” plot; 4) re-experiencing are affectively saturated and repeat the feelings experienced by the combatant during the battle – it is fear, horror, expressed anxiety and bodily haptic sense of danger; 5) unlike epileptic phenomena, there is invariance of re-experiencing in psychogenic flashbacks. Thus, the classic version of flashback in PTSD is characterized by the following clinical and psychopathological features: sensoralized representations and eidetic images; monomodal images; partial immersion in painful experiences with the preservation of contact with reality; preservation of all kinds of orientation, the absence of amnesia during flashback. In psychotic PTSD, accompanied by confusion, which in foreign literature are considered “dissociative disorders”, there are signs of atypical flashback, requiring a different strategy of patient management. These are the following features: transformation of eidetic images into illusions and hallucinations; polymodality of images; full immersion in painful experiences with the loss of contact with real reality; violation of orientation in place and time; partial amnesia of real events. Conclusions. Phenomenological clinical and psychopathological analysis of flashbacks in PTSD allows not only to estimate the belonging of this disorder to combat mental pathology, but to carry out a differential diagnosis of this phenomenon for more effective assistance to military combatants.
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Garrett, Phoebe. "FORESHADOWING AND FLASHBACK: CHILDHOOD ANECDOTES IN SUETONIUS’ CAESARS." Classical Quarterly 69, no. 1 (May 2019): 378–83. http://dx.doi.org/10.1017/s0009838819000314.

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Suetonius’ Lives of the Caesars contain at least twenty discrete anecdotes about childhood (pueritia) and youth (iuuenta or adulescentia) spread across the Lives. Some characterize the Caesars by looking forwards (foreshadowing) and others do so by looking backwards (flashbacks). In both foreshadowing and flashback, the childhood anecdote shows continuity with the adult and creates the impression of lifelong consistency of character. The foreshadowing technique is also something other ancient biographers do; the flashback is something that appears to be unique to Suetonius. In this note I briefly consider the stories from childhood and youth that foreshadow character traits and themes of the rest of the Life, and then the flashbacks from the adulthood section of the Life that refer to childhood and youth in order to demonstrate vices of the grown adult. I show that the use of foreshadowing and flashbacks contributes to the appearance of a fully formed character in the child that will be consistent into adulthood, as well as facilitating the rubric system of arranging material by type rather than by time.
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Chamallas, Stanley N. "Flashback." American Journal of Health-System Pharmacy 64, no. 7 (April 1, 2007): 776. http://dx.doi.org/10.2146/br060006.

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Bean, Leonard W. "Flashback." Physics World 7, no. 3 (March 1994): 23. http://dx.doi.org/10.1088/2058-7058/7/3/26.

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&NA;. "Flashback." Journal of Occupational and Environmental Medicine 43, no. 6 (June 2001): 566. http://dx.doi.org/10.1097/00043764-200106000-00011.

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Durio, Sharon, and Janet Schneider. "Flashback." Journal of Consumer Health On the Internet 11, no. 4 (December 2007): 61–72. http://dx.doi.org/10.1300/j381v11n04_05.

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Durand, Dorothée. "Flashback." Sociographe N° 79, no. 3 (September 1, 2022): 95–98. http://dx.doi.org/10.3917/graph1.079.0095.

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Boos, Kevin, David Chu, and Eduardo Cuervo. "FlashBack." GetMobile: Mobile Computing and Communications 20, no. 4 (April 18, 2017): 23–27. http://dx.doi.org/10.1145/3081016.3081026.

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Dissertations / Theses on the topic "Flashback"

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Chávez, Minda Andrea, and Urrutia María Inés Jacques. "Discotheque Flashback." Tesis, Universidad de Chile, 2015. http://repositorio.uchile.cl/handle/2250/137255.

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Tesis para optar al grado de Magíster en Marketing
Andrea Chávez Minda [Parte I], María Inés Jacques Urrutia [Parte II]
María Inés Jacques Urrutia [Parte II] no autoriza el acceso a texto completo de su documento
El presente Plan de Marketing nace con la idea de satisfacer la necesidad del segmento adulto entre 55 y 65 años, de bailar y divertirse en un ambiente nocturno con características particulares que satisfacen sus gustos y preferencias. Esta necesidad fue descubierta mediante un análisis de la industria de las Discotheques ubicadas en la ciudad de Santiago y su actual oferta de servicios de entretenimiento para diversos públicos. Este análisis fue justamente el que determinó la existencia de un segmento que quiere divertirse en un lugar que actualmente no se encuentra disponible en la capital chilena. Un minucioso estudio de los posibles segmentos, realizando investigación cualitativa y cuantitativa permitió identificar los posibles segmentos para la propuesta de servicio planteada y a su vez definir cuál será el target principal. Ahondar en estudios exploratorios de comportamientos del consumidor arrojaron varios insgihts que moldearon la actual propuesta de valor del servicio. En esta primera parte del trabajo, se detalla paso a paso el análisis situalcional previo a la definición de las estrategias de marketing y ventas para lograr que Flashback Disotheque – Restaurante, se posicione como un competidor fuerte en la industria y genere valor para los clientes locales y extranjeros.
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Milo, Elizabeth Moulton. "Exploring the flashback experience /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/7833.

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Dam, Bidhan Kumar. "Flashback propensity of gas mixtures." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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Shelil, Nasser. "Flashback studies with premixed swirl combustion." Thesis, Cardiff University, 2009. http://orca.cf.ac.uk/55494/.

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The important conclusion was reached that when combusting H2/CH 4 fuel mixes flashback behaviour approaches that of pure methane for equivalence ratios less than about 0.65, all pressures investigated up to 7 bara and air inlet temperatures of 300 and 473K. Significant deleterious changes in flashback behaviour for H2/CH4 fuel mixes occurred for air inlet temperatures of 673K, although operation at weak equivalence ratios less than 0.65 was still beneficial.
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Maurer, Lauren N. (Lauren Nichole). "Flashback : the return of psychedelic medicine." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/76174.

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Thesis (S.M. in Science Writing)--Massachusetts Institute of Technology, Dept. of Humanities, Graduate Program in Science Writing, 2012.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 23-25).
In the 1960's, psychedelic drugs were a part of not only popular culture, but also cuttingedge psychology research. Scientists were studying these drugs in the hope of understanding and treating various psychological and societal ills; but as psychedelics got caught up in the counter-culture, they fell out of favor with the public, and practically vanished from the research world as quickly as they'd appeared. Now, decades after they all but disappeared, psychedelics are making a comeback. Focusing primarily on research with psychedelics to treat post-traumatic stress disorder as well as anxiety and depression associated with terminal illness, this thesis examines the researchers who've brought psychedelic medicine back from the brink and the work they're doing to explore the potential within these complex and controversial drugs.
by Lauren N. Maurer.
S.M.in Science Writing
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Brandhill, Torbjörn S. "Svenskhet på Flashback forum? : Idealtypsanalys om Svenskhet utifrån fyra implicita kulturdefinitioner om svenskhet/svensk kultur på Flashback forum." Thesis, Linnéuniversitetet, Institutionen för statsvetenskap (ST), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-44184.

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Swedes and Swedish Culture are controversial political subjects in Sweden. The definitions for Swedish culture are very vague and what is the answer to the question: Who can be called Swedes? It has been debated in Sweden more since Swedish Democrats crossed the four percent threshold necessary for representation in the Swedish parliament. Swedes or Swedish culture on a large internet forum with 2 million visitors per week called Flashback forum is material for this thesis. Flashback forum has currently more than 50 million posts published and has more than 970 000 users. Flashback forum is more and more often mentioned in Swedish media. This is a new study of Swedes or Swedish culture in an internet context based on specific definitions of culture. The specific definitions of culture are based on Professor emeritus Karl-Olov Arnstberg’s book “Svenskheten – den kulturförnekande kulturen”. The specific definitions of culture are used in a classification of the posts on Flashback forum in an ideal type analysis. Which out of four specific definitions of culture are most notable on Flashback forum and what is significant for that particular definition? The most notable definition of culture on Flashback forum is “mentalt kapital”. “Mentalt kapital” is a definition about social values, political values and communicational skills such as the Swedish language.
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Nilsson, Sofia. "Flashback som informationskälla i vardagen : En kvantitativ enkätstudie om svenska studenters användning av Flashback Forum i vardagliga informationssyften." Thesis, Linnéuniversitetet, Institutionen för kulturvetenskaper (KV), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-99188.

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The somewhat controversial Swedish online discussion forum Flashback Forum (Flashback) is used by a large part of the Swedish population and contains large amounts of information with a wide diversity regarding subjects. Flashback is unique, not least with its focus on freedom of speech, and is often considered unreliable and questionable. However, the large amount of information stored enable the use of the forum as a source of everyday information, given the fact that the user remain critical in their approach to the information retrieved. It seems reasonable to assume that students also use Flashback for this reason; and they can be assumed to have certain experiences regarding searching for information and judging the trustworthiness of found information. The purpose of this essay is therefore to study how Swedish students use Flashback to search for and access information, and how they relate to this information. To study this some concepts from Reijo Savolainen’s theory of everyday information practices has been used, in which he takes a social phenomenological perspective to everyday life information seeking (ELIS). These concepts are information source horizons, information fields and pathways, and stock of knowledge. For the method a survey was used, which was distributed online during March 2020 mainly in different student groups on Facebook. The results showed that a majority of the respondents use Flashback to search for and access everyday information, which was mainly related to current crimes and suspects. The majority of the respondents retained a critical approach to the information and used it mainly to still their curiosity about cases mentioned on news sites or papers. This study shows that Flashback can – and is – used by students to retrieve everyday information, mainly because the sought for information is not available, or not openly available, elsewhere. This study also shows that despite Flashback’s questionable reliability, the nature of the forum, and the fact that most respondents had a relatively bad attitude towards the forum, Flashback has a great potential as a source for everyday information of minor importance, and for taking part of others’ experiences.
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Hatem, Fares. "Flashback analysis and avoidance in swirl burners." Thesis, Cardiff University, 2017. http://orca.cf.ac.uk/103700/.

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This study is aimed to investigate and demonstrate the feasibility and validity of various flame flashback resistance techniques for premixed fuel conditions. It presents a series of experiments to determine the impact of different configurations on flame flashback mechanisms. Experiments were performed using a 150 kW tangential swirl burner working on premixed mode with various swirl numbers; the flow field characteristics were measured by 1D LDA. The first part of the project targeted the effect of central fuel injector geometries on flame flashback mechanisms, especially combustion induced vortex breakdown (CIVB). It was found that changing the central fuel injector outside diameter can significantly alter the flame flashback mechanism. Large injector diameters result in boundary layer flashback (BLF), contrary, the use of small injectors diameter led to CIVB. Thus a dimensionless number (χ) which represent the ratio between the injector outside diameter and the nozzle inside diameter was introduced. Using this dimensionless number the critical value of transition from CIVB to BLF has been defined, the value being χ= 0.280 for Sg=1.12 and χ= 0.320 for Sg= 0.9. The second part was about the effect of using axial air injection instead of central fuel injectors. It was found that axial air jets have a considerable potential for flame stability requirements, they producing wider stability operation than that of central injectors. Moreover, the stability limits increase regarding both equivalence ratio and inlet tangential velocity. It appeared that using such air jets could reduce the combustor maintenance cost that arises due to a continuous harsh environment. However, it was found that axial air jets could enforce flame propagation during flashback via wall boundary layer. Thus, the third part of the study was about the validity of using micromeshes to improve BLF resistance in addition to axial air injection. It was found that using both techniques produced high flashback resistance for both mechanisms, i.e. CIVB and BLF.
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Jernberg, Anna, and Annica Hallquist. "När rykten blir nyheter : Lokalpressen och Flashback Forum." Thesis, Högskolan i Gävle, Avdelningen för humaniora, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-19430.

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Abstract Titel: När rykten blir nyheter – Lokalpressen och Flashback Forum Författare: Anna Jernberg, Annica Hallquist Handledare: Anna Edin   Uppsatsen behandlar relationen mellan Flashback Forum och Gävles lokaltidningar Gefle Dagblad och Arbetarbladet. Om hur nära de jobbar varandra, medborgarjournalisternas betydelse, vem som sätter agendan och hur tidningarna jobbar med de etiska spelreglerna. I viss mån även ryktesspridning. Syftet med uppsatsen var att studera om och i så fall hur medborgarjournalistiken bidrar till morgondagens nyheter via Flashback Forum. De metoder vi har använt oss av för att nå vår slutats är komparativ metod och semistrukturerade intervjuer. Den komparativa analysen för att se i hur många fall lokalpressen använder sig av Flashback och hur våra informanter i intervjuer säger sig arbeta med detta forum. Materialet kommer från intervjuer med journalister, Arbetarbladet (AB) och Gefle Dagblads (GD) nätupplagor samt tråden på Flashback Forum Mord på kvinna, Gävle 20/9-14 som handlar om mordet på Stora Esplanadgatan. Avgränsningsperioden var från 2014-09-20 till 2014-10-20. Vårt svar på undersökningen är: de kriminalfall du läser om på Flashback idag kanske du får läsa om i morgondagens tidning.   Nyckelord: Flashback Forum, agenda setting, medie- och pressetik, ryktesspridning, medborgarjournalistik, Arbetarbladet, Gefle Dagblad.
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Montgomery, Kenneth Edward. "The imagined Canadian, representations of whiteness in Flashback Canada." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ38757.pdf.

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Books on the topic "Flashback"

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Venuto, Michael. Flashback. Edmonton, Canada: Commonwealth Pub., 1997.

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Lisa, Rosenbaum, ed. Flashback. Outremont, Québec: Libre expression, 2005.

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Copyright Paperback Collection (Library of Congress), ed. Flashback. Toronto: Bantam Books, 1987.

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1960-, Haas Rick de, ed. Flashback! Amsterdam: Ploegsma, 2008.

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Copyright Paperback Collection (Library of Congress), ed. Flashback. Toronto: Harlequin, 2008.

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Markiewicz, Dawid. Flashback. Nowa Ruda: Mamiko, 2009.

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Barr, Nevada. Flashback. [Waterville, Me.]: Wheeler Pub., 2003.

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Pendleton, Don. Flashback. New York: Worldwide, 1997.

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Michael, Palmer. Flashback. Toronto: Bantam Books, 1988.

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Palmer, Michael. Flashback. London: Random House Group Limited, 2010.

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Book chapters on the topic "Flashback"

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Verster, Joris C., Thomas M. Tzschentke, Kieran O’Malley, Francis C. Colpaert, Bart Ellenbroek, Bart Ellenbroek, R. Hamish McAllister-Williams, et al. "Flashback." In Encyclopedia of Psychopharmacology, 537. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-68706-1_1671.

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Rugani, Fiona. "Flashback." In Handbuch Sozialwissenschaftliche Gedächtnisforschung, 1–12. Wiesbaden: Springer Fachmedien Wiesbaden, 2021. http://dx.doi.org/10.1007/978-3-658-26593-9_104-1.

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Montgomery, John. "Flashback." In Comedy Films 1894–1954, 268–74. London: Routledge, 2022. http://dx.doi.org/10.4324/9781003267669-19.

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Rugani, Fiona. "Flashback." In Handbuch Sozialwissenschaftliche Gedächtnisforschung, 277–87. Wiesbaden: Springer Fachmedien Wiesbaden, 2023. http://dx.doi.org/10.1007/978-3-658-26587-8_104.

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Kuhn, Darl, Sam Alapati, and Arup Nanda. "Performing Flashback Recovery." In RMAN Recipes for Oracle Database 12c, 395–442. Berkeley, CA: Apress, 2013. http://dx.doi.org/10.1007/978-1-4302-4837-8_13.

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Burwick, Frederick. "Flashback and Flashforward." In Time in Romantic Theatre, 29–47. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-96079-7_2.

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Guy, Olivier, and Ronan Champagnat. "Flashback in Interactive Storytelling." In Lecture Notes in Computer Science, 246–61. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-34292-9_17.

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Savile, Anthony. "More Vorblick than Flashback." In Thought: Its Origin and Reach, 55–57. London: Routledge, 2024. http://dx.doi.org/10.4324/9781003259633-6.

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Sun, Mingbo, Hongbo Wang, Zun Cai, and Jiajian Zhu. "Flame Flashback in Supersonic Flows." In Unsteady Supersonic Combustion, 241–305. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-3595-6_5.

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Kwon, Jaok. "Japan’s Flashback to Traditional Capitalism." In Organization, Management and Crime - Organisation, Management und Kriminalität, 251–79. Wiesbaden: Springer Fachmedien Wiesbaden, 2024. http://dx.doi.org/10.1007/978-3-658-42644-6_9.

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Conference papers on the topic "Flashback"

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Boos, Kevin, David Chu, and Eduardo Cuervo. "FlashBack." In MobiSys'16: The 14th Annual International Conference on Mobile Systems, Applications, and Services. New York, NY, USA: ACM, 2016. http://dx.doi.org/10.1145/2906388.2906418.

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Cidon, Asaf, Kanthi Nagaraj, Sachin Katti, and Pramod Viswanath. "Flashback." In the ACM SIGCOMM 2012 conference. New York, New York, USA: ACM Press, 2012. http://dx.doi.org/10.1145/2342356.2342400.

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Verma, Ishan, Rakesh Yadav, Naseem Ansari, Stefano Orsino, Shaoping Li, and Pravin Nakod. "Modeling of Flashback With Different Blends of CH4 and H2 by Using Finite Rate Chemistry With Large Eddy Simulation." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-82601.

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Abstract Due to its clean combustion characteristics, hydrogen fuel is gaining attention in power generation. New designs of engine systems and components are being explored to allow blending with the increasing amount of hydrogen in natural gas. Adding H2 increases the probability of flashback and often is one of the main constraints in using high H2 blends in premixed combustors. There are several mechanisms of flashback like boundary layer flashback, combustion induced vortex break down, turbulence in the flow, fluctuations in equivalence ratio, etc. Semi-empirical models, based on non-dimensional numbers and flame speed, have successfully predicted flashback propensity for a given operating condition. The semi-empirical models are computationally very efficient; however, they lack generality. A typical combustor can have multiple flashback mechanisms. The relative importance of each mechanism can change with a change in the combustor design or even with a difference in the operating conditions for the same combustor. Since prediction of flashback requires accurate modeling of highly transient chemistry phenomena and the impact of heat loss on chemistry, a viable detailed chemistry solution is preferred to model flashback. This paper describes the use of a finite rate chemistry model to predict flashbacks in a turbulent premixed combustor in this work. The configuration used is a swirl stabilized combustor (SimVal) from National Energy Technology Laboratory. The current computations are done with Finite Rate Chemistry (FRC) and Large Eddy Simulations (LES). Simulations are carried out for a varied percentage of CH4/H2 blends, ranging from 0% H2 to 100% H2 at a fixed equivalence ratio and inlet mass flow. As the percentage of H2 is increased in the fuel, flame speed also increases. With this, the propensity for flashbacks also increases. A 28-species reduced mechanism for CH4/H2 blend flames is used to keep the simulations computationally tractable. The simulations with the reduced mechanism are performed by considering non-adiabatic effects from heat loss near the walls and multi-component property considerations. This improves the accuracy of the FRC-LES simulations to capture the onset of boundary layer flashback towards the inlet. The simulations from FRC-LES suggest a fine mesh in the boundary layer for an accurate prediction that makes the simulations expensive. Therefore, an Adaptive Mesh Refinement (AMR) approach has been used for different CH4/H2 blends to accurately model the flashback without any loss in generality as the AMR criteria used here are applicable for a wide range of conditions. The FRC-based solution strategy proposed in this work provides a framework to model flashback for different blends without any case-specific tuning.
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Mahmoodi, Leila, Mehrtash Harandi, and Peyman Moghadam. "Flashback for Continual Learning." In 2023 IEEE/CVF International Conference on Computer Vision Workshops (ICCVW). IEEE, 2023. http://dx.doi.org/10.1109/iccvw60793.2023.00368.

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Eichler, Christian, and Thomas Sattelmayer. "Experiments on Flame Flashback in a Quasi-2D Turbulent Wall Boundary Layer for Premixed Methane-Hydrogen-Air Mixtures." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-23401.

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Premixed combustion of hydrogen-rich mixtures involves the risk of flame flashback through wall boundary layers. For laminar flow conditions, the flashback mechanism is well understood and is usually correlated by a critical velocity gradient at the wall. Turbulent transport inside the boundary layer considerably increases the flashback propensity. Only tube burner setups have been investigated in the past and thus turbulent flashback limits were only derived for a fully-developed Blasius wall friction profile. For turbulent flows, details of the flame propagation in proximity to the wall remain unclear. This paper presents results from a new experimental combustion rig, apt for detailed optical investigations of flame flashbacks in a turbulent wall boundary layer developing on a flat plate and being subject to an adjustable pressure gradient. Turbulent flashback limits are derived from the observed flame position inside the measurement section. The fuels investigated cover mixtures of methane, hydrogen and air at various mixing ratios. The associated wall friction distributions are determined by RANS computations of the flow inside the measurement section with fully resolved boundary layers. Consequently, the interaction between flame back pressure and incoming flow is not taken into account explicitly, in accordance with the evaluation procedure used for tube burner experiments. The results are compared to literature values and the critical gradient concept is reviewed in light of the new data.
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Dam, Bidhan, and Ahsan Choudhuri. "Flashback Propensity of Syngas Fuels." In ASME 2009 Power Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/power2009-81011.

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The paper presents experimental measurements of flashback propensity of H2-CO mixtures (primary constituents of syngas fuels). Effects of H2 concentration, external excitation and swirl on the flashback propensity of H2-CO flames are discussed. The flashback behavior of H2-CO flames changes nonlinearly with the increase in H2 contents in the mixture. The critical velocity gradient (gF) values of 5%–95% and 15%–85% H2-CO mixtures somewhat agree with the scaling relation (gF = c(SL2/α)) and yield an average c value of 0.035. However, the gF values of 25%–75% H2-CO mixture show higher order variations with the SL2/α ratio (especially for SL2/α < 19,000 s−1). At a lower SL2/α ratio, burner diameters have small effects on critical velocity gradient measurements; however, the effect is significant at higher SL2/α ratio. The effect of external excitation on the flashback propensity of H2-CO flames with more than 5% H2 is not significant. Flashback through two mechanisms and their dependence on combustor parameters were also identified for swirl stabilized H2-CO flames.
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Yang, Dingqi, Benjamin Fankhauser, Paolo Rosso, and Philippe Cudre-Mauroux. "Location Prediction over Sparse User Mobility Traces Using RNNs: Flashback in Hidden States!" In Twenty-Ninth International Joint Conference on Artificial Intelligence and Seventeenth Pacific Rim International Conference on Artificial Intelligence {IJCAI-PRICAI-20}. California: International Joint Conferences on Artificial Intelligence Organization, 2020. http://dx.doi.org/10.24963/ijcai.2020/302.

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Location prediction is a key problem in human mobility modeling, which predicts a user's next location based on historical user mobility traces. As a sequential prediction problem by nature, it has been recently studied using Recurrent Neural Networks (RNNs). Due to the sparsity of user mobility traces, existing techniques strive to improve RNNs by considering spatiotemporal contexts. The most adopted scheme is to incorporate spatiotemporal factors into the recurrent hidden state passing process of RNNs using context-parameterized transition matrices or gates. However, such a scheme oversimplifies the temporal periodicity and spatial regularity of user mobility, and thus cannot fully benefit from rich historical spatiotemporal contexts encoded in user mobility traces. Against this background, we propose Flashback, a general RNN architecture designed for modeling sparse user mobility traces by doing flashbacks on hidden states in RNNs. Specifically, Flashback explicitly uses spatiotemporal contexts to search past hidden states with high predictive power (i.e., historical hidden states sharing similar contexts as the current one) for location prediction, which can then directly benefit from rich spatiotemporal contexts. Our extensive evaluation compares Flashback against a sizable collection of state-of-the-art techniques on two real-world LBSN datasets. Results show that Flashback consistently and significantly outperforms state-of-the-art RNNs involving spatiotemporal factors by 15.9% to 27.6% in the next location prediction task.
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Duan, Zhixuan, Brendan Shaffer, Vincent McDonell, Georg Baumgartner, and Thomas Sattelmayer. "Influence of Burner Material, Tip Temperature and Geometrical Flame Configuration on Flashback Propensity of H2-Air Jet Flames." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94823.

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Flashback is a key operability issue for low emission premixed combustion systems operated on high hydrogen content fuels. Previous work investigated fuel composition impacts on flashback propensity and found that burner tip temperature was important in correlating flashback data in premixed jet flames. An enclosure around the jet flame was found to enhance the flame-burner rim interaction. The present study further addresses these issues using a jet burner with various geometric configurations and interchangeable materials. Systematic studies addressing the quantitative influence of various parameters such as tip temperature, burner material, enclosure size, and burner diameter on flashback propensity were carried out. A comprehensive overview of the flashback limits for all conditions tested in the current study as well as those published previously is given. The collective results indicate that the burner materials, tip temperature and flame confinement play significant roles for flashback propensity and thus help explain previous scatter in flashback data. Furthermore, the present work indicates that the upstream flame propagation during flashback is affected by the burner material. The material with lower thermal conductivity yields larger flashback propensity but slower flame regression inside the tube. These observations can be potentially exploited to minimize the negative impacts of flashback in practical applications.
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Sayad, Parisa, Alessandro Schönborn, Mao Li, and Jens Klingmann. "Visualization of Different Flashback Mechanisms for H2/CH4 Mixtures in a Variable-Swirl Burner." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-27090.

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Flame flashback from the combustion chamber to the premixing section is a major operability issue when using high H2 content fuels in lean premixed combustors. Depending on the flow-field in the combustor, flashback can be triggered by different mechanisms. In this work, three flashback mechanisms of H2/CH4 mixtures were visualized in an atmospheric variable swirl burner using high speed OH* chemiluminescence imaging. The H2 mole fraction of the tested fuel mixtures varied between 0.1 and 0.9. The flow-field in the combustor was varied by changing the swirl number from 0.0 to 0.66 and the total air mass-flow rate from 75 to 200 SLPM (standard liters per minute). The following three types of flashback mechanism were observed: Flashback caused by combustion induced vortex breakdown occurred at swirl numbers ≥ 0.53 for all of the tested fuel mixtures. Flashback in the boundary layer and flashback due to autoignition were observed at low swirl numbers and low total air mass-flow rates. The temporal and spatial propagation of the flame in the optical section of the premixing tube during flashback was studied and flashback speed for different mechanisms was estimated. The flame propagation speed during flashback was significantly different for the different mechanisms.
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Hoferichter, Vera, and Thomas Sattelmayer. "Boundary Layer Flashback in Premixed Hydrogen-Air Flames With Acoustic Excitation." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63080.

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Lean premixed combustion is prevailing in gas turbines to minimize nitrogen oxide emissions. However, this technology bears the risk of flame flashback and thermoacoustic instabilities. Thermoacoustic instabilities induce velocity oscillations at the burner exit which, in turn, can trigger flame flashback. This article presents an experimental study at ambient conditions on the effect of longitudinal acoustic excitation on flashback in the boundary layer of a channel burner. The acoustic excitation simulates the effect of thermoacoustic instabilities. Flashback limits are determined for different excitation frequencies characterizing intermediate frequency dynamics in typical gas turbine combustors (100–350 Hz). The excitation amplitude is varied from 0 to 36 % of the burner bulk flow velocity. For increasing excitation amplitude, the risk of flame flashback increases. This effect is strongest at low frequencies. For increasing excitation frequency the influence of the velocity oscillations decreases as the flame has less time to follow the changes in bulk flow velocity. Two different flashback regimes can be distinguished based on excitation amplitude. For low excitation amplitudes flashback conditions are reached if the minimum flow velocity in the excitation cycle falls below the flashback limit of unexcited unconfined flames. For higher excitation amplitudes, where the flame starts to periodically enter the burner duct, flashback is initiated if the maximum flow velocity in the excitation cycle is lower than the flashback limit of confined flames. Consequently, flashback limits of confined flames should also be considered in the design of gas turbine burners as a worst case scenario.
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Reports on the topic "Flashback"

1

Tim Lieuwen. Flashback Characteristics of Syngas-Type Fuels Under Steady and Pulsating Conditions. Office of Scientific and Technical Information (OSTI), September 2007. http://dx.doi.org/10.2172/924769.

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Lieuwen, Tim, Dom Santavicca, and Vigor Yang. Prediction of Combustion Stability and Flashback in Turbines with High-Hydrogen Fuel. Office of Scientific and Technical Information (OSTI), March 2012. http://dx.doi.org/10.2172/1121243.

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Ahsan Choudhuri. Effects of Combustion-Induced Vortex Breakdown on Flashback Limits of Syngas-Fueled Gas Turbine Combustors. Office of Scientific and Technical Information (OSTI), March 2011. http://dx.doi.org/10.2172/1025558.

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Clemens, Noel, and Venkat Raman. Predictive LES Modeling and Validation of High-Pressure Turbulent Flames and Flashback in Hydrogen-enriched Gas Turbines. Office of Scientific and Technical Information (OSTI), April 2019. http://dx.doi.org/10.2172/1506058.

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Kalantari, Alireza, Elliot Sullivan-Lewis, and Vincent McDonell. Development of Criteria for Flashback Propensity in Jet Flames for High Hydrogen Content and Natural Gas Type Fuels. Office of Scientific and Technical Information (OSTI), October 2016. http://dx.doi.org/10.2172/1357931.

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Clemens, Noel. Large Eddy Simulation Modeling of Flashback and Flame Stabilization in Hydrogen-Rich Gas Turbines Using a Hierarchical Validation Approach. Office of Scientific and Technical Information (OSTI), September 2015. http://dx.doi.org/10.2172/1253136.

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Ihme, Matthias, and James Driscoll. Development and Experimental Validation of Large Eddy Simulation Techniques for the Prediction of Combustion-Dynamic Process in Syngas Combustion: Characterization of Autoignition, Flashback, and Flame-Liftoff at Gas-Turbine Relevant Operating Conditions. Office of Scientific and Technical Information (OSTI), August 2015. http://dx.doi.org/10.2172/1337558.

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Fleming, Kevin James, Brian Matthew Melof, Brian V. Ingram, Susan Fae Ann Bender, Heidi M. Anderson, Timothy Todd Covert, Edward J. Mulligan, and Michele D. Steyskal. Less-than-lethal "flashbang" diversionary device. Office of Scientific and Technical Information (OSTI), November 2003. http://dx.doi.org/10.2172/918275.

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Flashback. Canadian Permanent Committee on Geographical Names. Annual Meeting, Fredericton, N.B., 1967 - photo. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1987. http://dx.doi.org/10.4095/298257.

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52-Year-old female janitor died as a result of a vapor flashback while using flammable lacquer thinner to remove carpet glue from concrete basement floor. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, May 2005. http://dx.doi.org/10.26616/nioshsface04mi130.

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