Academic literature on the topic '"Tales from two pockets"'
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Journal articles on the topic ""Tales from two pockets""
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Bradbrook, B. R., Karel Čapek, and Norma Comrada. "Tales from Two Pockets." World Literature Today 69, no. 1 (1995): 180. http://dx.doi.org/10.2307/40151026.
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Fuertes-Miquel, Vicente S., P. Amparo López-Jiménez, F. Javier Martínez-Solano, and Gonzalo López-Patiño. "Numerical modelling of pipelines with air pockets and air valves." Canadian Journal of Civil Engineering 43, no. 12 (2016): 1052–61. http://dx.doi.org/10.1139/cjce-2016-0209.
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This work considers the behaviour of air inside pipes when the air is expelled through air valves. Generally, the air shows isothermal behaviour. Nevertheless, when the transient is very fast, it shows adiabatic behaviour. In a real installation, an intermediate evolution between these two extreme conditions occurs. Thus, it is verified that the results vary significantly depending on the hypothesis adopted. To determine the pressure of the air pocket, the most unfavourable hypothesis (isothermal behaviour) is typically adopted. Nevertheless, from the perspective of the water hammer that takes place when the water column arrives at the air valve and abruptly closes, the most unfavourable hypothesis is the opposite (adiabatic behaviour). In this case, the residual velocity with which the water arrives at the air valve is higher, and, consequently, the water hammer generated is greater.
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Vallabhajosyula, Phani. "Stencil Print solutions for Advance Packaging Applications." International Symposium on Microelectronics 2017, no. 1 (2017): 000646–51. http://dx.doi.org/10.4071/isom-2017-poster1_124.
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Abstract This paper address two significant applications of stencils in advance packaging field: 1. Ultra-Thin stencils for miniature component (0201m) assembly; 2. Deep Cavity stencils for embedded (open cavity) packaging. As the world of electronics continues to evolve with focus on smaller, lighter, faster, and feature-enhanced high-performing electronic products, so are the requirement for complex stencils to assemble such components. These stencil thicknesses start from less than 25um with apertures as small as 60um (or less). Step stencils are used when varying stencil thicknesses are required to print into cavities or on elevated surfaces or to provide relief for certain features on a board. In the early days of SMT assembly, step stencils were used to reduce the stencil thickness for 25 mil pitch leaded device apertures. Thick metal stencils that have both relief-etch pockets and reservoir step pockets are very useful for paste reservoir printing. Electroform Step-Up Stencils for ceramic BGA's and RF Shields are a good solution to achieve additional solder paste height on the pads of these components as well as providing exceptional paste transfer for smaller components like uBGAs and 0201s. As the components are getting smaller, for example 0201m, or as the available real estate for component placement on a board is getting smaller – finer is the aperture size and the pitch on the stencils. Aggressive distances from step wall to aperture are also required. Ultra-thin stencils with thicknesses in the order of 15um–40um with steps of 15um are used to obtain desired print volumes. Stencils with thickness to this order can be potential tools even to print for RDLs in the package. Cavity technology can be an effective solution in reducing the total assembled PCB thickness (Z-height), most importantly, on designs utilizing taller - stacked devices. Traditionally, dipping process or dispensing process was used to deposit solder paste, flux, or glue on uneven surfaces. However, this takes a longer time when compared to printing using a stencil printer. Reservoir printing using a stencil printer has greater potential in such application. Extensive work has been done in the past to print glue, solder paste and/or flux into cavities using reservoir printing. This paper focuses on printing solder paste into multiple cavities (stencil pockets) with depths ranging from 355 microns to 450 microns, and with varying cavity size, wall angles and various stencil thicknesses ranging from 100 microns to 150 microns. Apertures varying in area ratio were placed in these cavities and experiments were conducted to analyze the print performance of the stencils. As the size of the components and boards/substrates gets smaller - closer placement of components to the cavity (stencil pocket) walls needed to be assessed as well. These applications, the associated stencil design and print results were discussed in detail in this paper.
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Ramadhany, Eka Pramudita, Al Sri Koes Soesilowati, and Sri Pramestri Lastianny. "Effect of sandwich bone augmentation using hydroxyapatite and demineralized freeze- dried bone on infrabony pocket treatment." Majalah Kedokteran Gigi Indonesia 5, no. 3 (2020): 114. http://dx.doi.org/10.22146/majkedgiind.37427.
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Periodontitis is periodontal inflammation in response to plaque bacterial antigens, causing damage to periodontal ligament and alveolar bone resorption. Bone graft material combination i.e. demineralized freeze-dried bone allograft (DFDBA) and hydroxyapatite (HA) using sandwich bone augmentation (SBA) method will support each other and will be beneficial to be used as a scaffold. The body takes long time to resorb HA so this could complement DFDBA which is more easily dissolved. This study aimed to reveal the effect of bone graft addition using SBA method on the treatment of infrabony pocket with open flap debridement in terms of probing depth, relative attachment loss, alveolar bone height, and density. This study was carried out to 20 infrabony pockets, where 10 of them were treated using open flap debridement with HA addition, while the other 10 groups were treated using open flap debridement with DFDBA and HA using SBA method. Probing depth and relative attachment loss were measured on days 0, 30 and 90. Bone height and density were measured using cone-beam computed tomography (images on day 0 and 90). The study showed that probing depth reduction on SBA group was greater than HA group. There were significant differences in probing depth and relative attachment loss examinations. However, bone height and bone density reduction did not show any significant difference. The conclusion from this study is open flap debridement using SBA method yields better regeneration in terms of probing depth and relative attachment loss than open flap debridement with HA addition. There is no difference in bone height and bone density between the two groups.
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Nazari, Hossein, and Maryam Khorasani. "The Appeal of the Fantastic and the Improbable in Late Eighteenth-Century Children's Literature." International Research in Children's Literature 14, no. 1 (2021): 78–91. http://dx.doi.org/10.3366/ircl.2021.0379.
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Eighteenth-century children's authors implicitly exploited the fantastic and the improbable aspects of fairy tales to complement the persuasiveness of their moralistic teachings. Whereas the coexistence of chapbook residue with middle-class pedagogy in eighteenth-century children's books has already been underlined in scholarly studies, little critical attention has been paid to the rhetorical effects exercised by the incorporation of the fantastic and the improbable in eighteenth-century children's stories. Through appealing to the audience's collective imagination, eighteenth-century children's authors both derived from and built upon a set of common aspirations shared by a middle-class audience, thus cultivating a sense of what Kenneth Burke termed consubstantiality among the readers. Focussing on John Newbery's A Little Pretty Pocket-Book (1744), The History of Goody Two-Shoes (1765), and Maria Edgeworth's ‘The Orphans’ (1796), this study explores the modus operandi through which late-eighteenth-century children's authors sought to communicate serious messages by employing improbable plotlines.
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Ream, Todd. "Tales from Two Cities." Newman Studies Journal 4, no. 1 (2007): 24–37. http://dx.doi.org/10.5840/nsj2007413.
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Stasiuk, Andrzej, and Margarita Nafpaktitis. "Two Stories from "Galician Tales"." Chicago Review 46, no. 3/4 (2000): 241. http://dx.doi.org/10.2307/25304622.
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Diéguez, Francisco Javier, Yara Zau, Inés Viegas, Sara Fragoso, Patricia V. Turner, and Gonçalo da Graça-Pereira. "An Evaluation of Portuguese Societal Opinion towards the Practice of Bullfighting." Animals 10, no. 11 (2020): 2065. http://dx.doi.org/10.3390/ani10112065.
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Bullfighting is a controversial sport that continues to be legally permitted in a number of countries around the world, including Portugal. The spectacle has attracted significant attention from animal protectionist groups for many years because of concerns for animal distress, pain, and suffering during the fights. While there has been strong support for the sport in Portugal in the past, there is a need to study social profiles regarding the acceptability of this sport before a case can be made for changes in regional and national legislation. In this study, Portuguese attendance patterns at bullfights were assessed in addition to public opinions on welfare and ethical aspects of bullfighting, based on demographic variables. Study participants (n = 8248) were largely recruited through Portuguese social media channels (respondents may not be representative of the Portuguese population). Questionnaire data were evaluated by means of frequency tables, multiple correspondence analyses, and a two-step cluster analysis. Most respondents had a negative opinion about bullfighting and perceived that bullfighting had no positive impact on the country. However, while most respondents thought that the bull suffered during bullfighting, the opinion regarding banning bullfighting was far from unanimous. Based on the demographic analysis, the profile of individuals with more favorable responses towards bullfighting were men > 65 years old, of Roman Catholic faith, of low- or high-income levels, from more rural areas of Portugal. Somewhat surprisingly, there was a tendency to favor bullfighting amongst veterinary professionals. We conclude that there were still large pockets of individuals who desire to maintain the practice of traditional bullfighting within Portuguese society, despite recognition of animal suffering during the event.
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Shalamov, V. T. "Tales from Kolyma." Index on Censorship 15, no. 8 (1986): 14–15. http://dx.doi.org/10.1080/03064228608534140.
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Reilly, Isobel. "Letter from Nothern Ireland; Tales from Two Hemispheres." Australian and New Zealand Journal of Family Therapy 23, no. 4 (2002): 223–24. http://dx.doi.org/10.1002/j.1467-8438.2002.tb00525.x.
Full textDissertations / Theses on the topic ""Tales from two pockets""
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Jandejsková, Viola. "Jazykové prostředky vyjadřující dativ." Master's thesis, 2013. http://www.nusl.cz/ntk/nusl-329191.
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This thesis disserts on problem of translation of dative relations in Karel Čapek's "Tales from two pockets" into Japanese. Goal of the thesis is to identify and describe means of expression of dative in Japanese translation and figure out if there are any differences in interpretaion and expressing dative in Czech and Japanese and what they are. Using method of excerption of example sentences and comparation of original with translated version, I organised the example sentences into six categories according to linguistic means of expressing equivalent of Czech dative used in Japanese translation. In these six categories, there are included both grammatical and semanthic expressions and idioms and phrases. The result is the detection of the main difference in degree of necessity to express a dative subject explicitly. There is a strong tendency of Japanese to implicit expression of dativ subject by means of special expressions of personal orientation, semanthics of predicate or context.
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CHEN, HSIAO-HENG, and 陳孝恆. "A Comparative Study of Strategic Differences between Two Translation Versions of Tales from Shakespeare: A Purpose / Audience-Oriented Perspective." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/ze83fp.
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碩士<br>國立高雄第一科技大學<br>應用英語系口筆譯碩士班<br>106<br>This thesis aims to probe strategic differences between two translation versions of Charles Lamb and Mary Lamb’s Tales from Shakespeare, which were completed by Xiao and Chen respectively. Vermeer’s (1989) skopos theory and Reiss’ (2004) text typology theory are used as the theoretical framework to support the arguments regarding different degrees of simplification and explicitation that are presented in the two translation versions. To achieve the research objective, this study investigate simplification and explicitation features by measuring the differences in the number of Chengyus and fixed phrases, the average sentence length and the number of conjunctions between Xiao’s (36,033 words) and Chen’s (34,334 words) translation versions.
The rough statistical results show that Xiao uses fewer Chengyus and fixed phrases (113 times) than Chen (304 times). With regard to the average sentence length, Xiao’s translation version (36.69 words per sentence) is shorter than that of Chen’s translation version (44.94 words per sentence). Additionally, Xiao uses fewer conjunctions (433 times) than Chen (521 times). The findings suggest that Xiao’s translation version has a higher degree of simplification than Chen’s due to the use of fewer Chengyus and fixed phrases and the shorter sentence length. In contrast, Xiao’s translation version shows a lower degree of explicitation as the result of fewer conjunctions. In light of their differences in the degrees of simplification and explicitation, we reach a conclusion that both of the translators’ intended purposes are theoretically achieved because Xiao’s target audiences are generally youngsters and need to read a translation with higher level of simplicity, while Chen’s target audiences are not only youngsters but also adult readers so they can accept the translation featured by the lower level of simplicity.
As of today, the translations of Shakespeare’s adapted works have been scarcely explored from the functionalistic perspective in Taiwan. This study provides a reference model for future researchers who are interested in the translations of Shakespeare’s adapted works. It also suggests the importance of using different translation strategies to achieve different purposes for different target audiences.
Books on the topic ""Tales from two pockets""
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Morgan, Michaela. Loyalty and royalty: Two tales from Wales. Collins Educational, 1996.
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Jafa, Dhirendra Singh. Three countries, one people: Tales from two wars. Minerva Press, 1999.
Find full textBook chapters on the topic ""Tales from two pockets""
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Sonnevend, Pál. "The Responsibility of Courts in Maintaining the Rule of Law: Two Tales of Consequential Judicial Self-Restraint." In Defending Checks and Balances in EU Member States. Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-662-62317-6_7.
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AbstractModern constitutionalism is based on the paradigm that courts are inherently entitled and obliged to enforce the constitution of the respective polity. This responsibility of courts also applies in the context of the European Union to both the CJEU and national constitutional courts. The present chapter argues that in the face of constitutional crises the CJEU and the Hungarian Constitutional Court shy away from applying the law as it is to the full. The reasons behind this unwarranted judicial self-restraint are most different: the CJEU aims to avoid conflicts with national constitutional courts whereas the Hungarian Constitutional Court has been facing a legislative power also acting as constitution making power willing to amend the constitution to achieve specific legislative purposes or to undo previous constitutional court decisions. Yet both courts respond to expediencies that do not follow from the law they are called upon to apply. It is argued that rule of law backsliding requires these courts to abandon the unnecessary self-restraint and exploit the means already available.
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Ferreira, Ana Isabel, and Soraia Ferreira. "From a Linear Literary Narrative to an Interactive Digital Narrative: A Study on Potentialities Through Two Tales: “The Mystery of the Tree” and “Red Riding Hood”." In Springer Series in Design and Innovation. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-61671-7_17.
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Met, Philippe. "The banlieue wore black: post-war French polar, from Becker to Corneau." In Screening the Paris suburbs. Manchester University Press, 2018. http://dx.doi.org/10.7228/manchester/9781526106858.003.0012.
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This overview charts the evolution from the 1950s to the 1980s of the French detective or crime film (le polar). Proto-noir films shot before World War II had been primarily centred on Paris, a trend furthered in post-war works which regularly conjoined seedy Pigalle and the glamorous Champs-Elysées as two sides of the same coin. From Jacques Becker (Casque d’or, 1952; Grisbi, 1954) to Jean-Pierre Melville (Le Doulos, 1962; Le Samouraï, 1967) via Jules Dassin (Rififi, 1955), a gradual shift toward suburban locales takes place around new genre conventions and motifs. The suburbs variously lend themselves to hideouts, shootouts and executions; to the sale of all things illegal or counterfeit; to the gloomy atmospherics of railway tracks, deserted roadways and abandoned villas. A subsequent generation of directors would exploit the multi-faceted social and geographical reality of the modern housing estates that encroached upon traditional allotments of single-family homes and pockets of suburban wasteland; Henri Verneuil’s mainstream caper Mélodie en sous-sol (1963) thus portrays a disorientatingly mutating Sarcelles. Most decisively, Alain Corneau’s naturalistic noirs Série noire (1979) and Choix des armes (1981) add a sociological dimension to the genre by broaching questions of violence, alienation and devastation.
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Rethel, Lena, Juanita Elias, and Lisa Tilley. "Tales from two cities." In Muslim Piety as Economy. Routledge, 2019. http://dx.doi.org/10.4324/9780429321146-10.
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"The two thieves." In Tales from the Masnavi. Routledge, 2013. http://dx.doi.org/10.4324/9781315026091-57.
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"The king and the two slaves." In Tales from the Masnavi. Routledge, 2013. http://dx.doi.org/10.4324/9781315026091-36.
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Nagra, Daljit. "SO FAR FROM HOME TO FIND HIS FAITH." In Tales of Two Londons. OR Books, 2018. http://dx.doi.org/10.2307/j.ctvdf007p.27.
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"Two Tales from a Reluctant Manager." In Introducing Change from the Top in Universities and Colleges. Routledge, 2013. http://dx.doi.org/10.4324/9781315041483-9.
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Grim, Jacob, and Wilhelm Grim. "A Tall Tale From Diethmarsch." In Selected Tales. Oxford University Press, 2009. http://dx.doi.org/10.1093/owc/9780199555581.003.0073.
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I’ll tell you something. I saw two roast chickens flying. They were flying fast and had turned their bellies towards Heaven, their backs towards Hell. And an anvil and a millstone were swimming across the Rhine, nice and slow and smooth, and a frog...
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Bagchi, Amiya Kumar, and Anthony P. D’Costa. "Guaranteeing Rural Employment—Tales from Two Countries." In Transformation and Development. Oxford University Press, 2012. http://dx.doi.org/10.1093/acprof:oso/9780198082286.003.0002.
Full textConference papers on the topic ""Tales from two pockets""
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Abrahamsen, Mikkel. "Spiral Toolpaths for High-Speed Machining of 2D Pockets With or Without Islands." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46255.
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We describe new methods for the construction of spiral toolpaths for high-speed machining. In the simplest case, our method takes a polygon as input and a number δ > 0 and returns a spiral starting at a central point in the polygon, going around towards the boundary while morphing to the shape of the polygon. The spiral consists of linear segments and circular arcs, it is G1 continuous, it has no self-intersections, and the distance from each point on the spiral to each of the neighboring revolutions is at most δ. Our method has the advantage over previously described methods that it is easily adjustable to the case where there is an island in the polygon to be avoided by the spiral. In that case, the spiral starts at the island and morphs the island to the outer boundary of the polygon. It is shown how to apply that method to make significantly shorter spirals in polygons with no islands than what is obtained by conventional spiral toolpaths. Finally, we show how to make a spiral in a polygon with multiple islands by connecting the islands into one island.
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Nguyen Thi, Dung. "The World Miraculous Characters in Vietnamese Fairy Tales Aspect of Languages – Ethnic in Scene South East Asia Region." In GLOCAL Conference on Asian Linguistic Anthropology 2019. The GLOCAL Unit, SOAS University of London, 2019. http://dx.doi.org/10.47298/cala2019.13-1.
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Like other genres of folk literature, fairy tales of Vietnamese ethnicity with miraculous character systems become strongly influenced by Southeast Asia’s historical-cultural region. Apart from being influenced by farming, Buddhism, Confucianism, urbanism, Vietnamese fairy tales are deeply influenced by ethno-linguistic elements. Consequently, fairy tales do not preserve their root identities, but shift and emerge over time. The study investigates and classifies the miraculous tales of peoples of Vietnam with strange characters (fairies, gods, Buddha, devils) in linguistic and ethnographic groups, and in high-to-low ratios. Here the study expands on, evaluates, correlates, and differentiates global miraculous characters, and describes influences of creation of miraculous characters in these fairy tales. The author affirms the value of this character system within the fairy tales, and develops conceptions of global aesthetic views. To conduct the research, the author applies statistical methods, documentary surveys, type comparison methods, systematic approaches, synthetic analysis methods, and interdisciplinary methods (cultural studies, ethnography, psychoanalysis). The author conducted a reading of and referring to the miraculous fairy tales of the peoples of Vietnam with strange characters. 250 fairy tales were selected from 32 ethnic groups of Vietnam, which have the most types of miraculous characters, classifying these according to respective language groups, through an ethnography. The author compares sources to determine characteristics of each miraculous character, and employs system methods to understand the components of characters. The author analyzes and evaluates the results based on the results of the survey and classification. Within the framework of the article, the author focuses on the following two issues; some general features of the geographical conditions and history of Vietnam in the context of Southeast Asia’s ancient and medieval periods were observed; a survey was conducted of results of virtual characters in the fairy tales of Vietnam from the perspective of language, yet accomplished through an ethnography. The results of the study indicate a calculation and quantification of magical characters in the fairy tales of Vietnamese. This study contributes to the field of Linguistic Anthropology in that it presents the first work to address the system of virtual characters in the fairy tales of Vietnam in terms of language, while it surveys different types of material, origins formed, and so forth.
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Lee, Yuan-Shin, and Dhaval Daftari. "Handling Protrusion Features With Virtual Pockets for Automated Process Planning." In ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium collocated with the ASME 1995 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/cie1995-0792.
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Abstract In this paper a two step approach for the transformation of design features to manufacturing features is presented. In the first stage of the proposed algorithm, a methodology for handling protrusion features by the decomposition of the surrounding volume into basic, negative, machinable volumes is discussed. In the second stage called the feature refinement stage, relevant manufacturing information is appended to the negative feature model resulting from the first stage. The proposed methodology can be used to support automated process planning. Practical examples and computer implementation in an object oriented feature based design system are also presented.
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Kettleborough, C. F. "Starting Phenomena of Tilting Pad Bearings." In ASME 2001 Engineering Technology Conference on Energy. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/etce2001-17169.
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Abstract The starting of large thrust bearings in turbines is one of the most critical points in their operation as a pressure carrying oil film must be generated from initial conditions of load and zero relative velocity between the two surfaces. A force equal and opposite to the applied load must be produced before the surfaces separate. It is the purpose of this paper to discuss the origin and formation of this force. The results show that lapped and ground surfaces have inefficient lifting characteristics as compared with surfaces having irregularities on the surface of 1/20 mil and greater. In general, surface oil pockets have an important influence on the starting behavior of tilting pad bearings; without these oil pockets it is doubtful if the two bearing surfaces would part.
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Prakash, Shashvat, Yedidia Neumeier, and Ben T. Zinn. "Blowout Margin Estimation Based on Two Precursor Types." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27874.
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Lean, premixed combustion has been aggressively pursued in recent years because it offers a practical approach for reducing emissions of nitrogen oxides (NOx) from gas turbines. However, lean premixed flames pose a greater risk of blowout. Studies on swirl and dump stabilized flames have shown that as a flame approaches blowout, distinctive precursors occur, such as pockets of localized extinctions and brief flame shape transitions to a thin ‘tornado’ configuration. For this study, both precursor types are detected using separate, dedicated optical sensors. Observations indicate that the tornado mode is part of the blowout process in a 127 mm long combustor and that a localized extinction precursor immediately precedes the tornado mode transition. Despite the causality, the statistics of tornado bursts and localized extinctions suggest a ‘memoryless’ Poisson process, where the occurrence of one event type does not influence the time until the next event of the same type. Localized extinctions have been used previously for blowout margin estimation, and are well suited for the purpose because the occurrence frequency increases with diminishing margin. However, the signals commonly used to detect localized extinction events are noisy due to the nature of the flame; thus, detection is prone to false alarms. Detecting tornado bursts, by comparison, is less ambiguous but such events occur too rarely for blowout mitigation applications. The shortcomings of both precursor detection methods can be addressed by combining observations of both precursor types in a meaningful manner. The presence of tornado bursts indicates that the flame is near blowout; this fact can be used to calibrate margin estimation routines based upon localized extinction. However, this approach would require two sensors since any one optical sensor cannot directly differentiate both precursor types. A single sensor approach can be developed whereby the causal relationship between the two precursor types is exploited. Local extinctions with longer duration times can potentially perturb the flame into an alternate flow configuration. The presence of these tornado ‘triggers’ manifest as an increase in the low frequency content of the chemiluminescence signal. A low pass filter with the appropriate cutoff frequency can differentiate between the tornado-triggering and benign, inconsequential localized extinctions. Therefore, the same signal that detects localized extinctions can be filtered to capably predict tornado mode shifts. This scheme will enable robust margin detection and minimize sensitivity to noise.
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Andersen, Fredrik Herland, and Stefan Mayer. "Parametric Study of the Scavenging Process in Marine Two-Stroke Diesel Engines." In ASME 2015 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/icef2015-1075.
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Large commercial ships such as container vessels and bulk carriers are propelled by low-speed, uniflow scavenged two-stroke diesel engines. The integral in-cylinder process in this type of engine is the scavenging process, where the burned gas from the combustion process is evacuated through the exhaust valve and replaced with fresh air for the subsequent compression stroke. The scavenging air enters the cylinder via inlet ports which are uncovered by the piston at bottom dead center (BDC). The exhaust gas is then displaced by the fresh air. The scavenging ports are angled to introduce a swirling component to the flow. The in-cylinder swirl is beneficial for air-fuel mixture, cooling of the cylinder liner and minimizing dead zones where pockets of exhaust gas are trapped. However, a known characteristic of swirling flows is an adverse pressure gradient in the center of the flow, which might lead to a local deficit in axial velocity and the formation of central recirculation zones, known as vortex breakdown. This paper will present a CFD analysis of the scavenging process in a MAN B&W two-stroke diesel engine. The study include a parameter sweep where the operating conditions such as air amount, port timing and scavenging pressure are varied. The CFD model comprise the full geometry from scavenge receiver to exhaust receiver. Asymmetric inlet and outlet conditions is included as well as the dynamics of a moving piston and valve. Time resolved boundary conditions corresponding to measurements from an operating, full scale production, engine as well as realistic initial conditions are used in the simulations. The CFD model provides a detailed description of the in-cylinder flow from exhaust valve opening (EVO) to exhaust valve closing (EVC). The study reveals a close coupling between the volume flow (delivery ratio) and the in-cylinder bulk purity of air which appears to be independent of operating conditions, rpm, scavenge air pressure, BMEP etc. The bulk purity of air in the cylinder shows good agreement with a simple theoretical perfect displacement model.
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Van Duyne, Daniel A., Lenin B. Semprucci, and Nathan Jaycox. "Pump Start Transients in Closed Loop System Solved With Restriction Orifices." In ASME 2003 Pressure Vessels and Piping Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/pvp2003-1811.
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Pressure spikes following pump start in a closed loop system at Millstone Unit 2, caused thermal relief valve lifting, and two remained partially open, draining 40 gpm (2.5 L/s). Entrapped air following maintenance activities caused these pressure spikes. Proposed solutions included changing pump impellers, removing all thermal relief valves, and vacuum filling the system. Altran proposed installing orifice plates as flow restrictors in the 8” (203 mm) lines from the surge tank. These flow restrictors reduced the collapse rate of the captive gas pockets and thus reduced the associated pressure spikes following pump start which was confirmed by tests performed in March, 2002.
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Pan, Coda H. T., Tae Ho Kim, and Joseph J. Rencis. "Rolling Stream Trails: An Alternative Cavitation Analysis." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44405.
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The Rolling Stream Trails (RST) model introduces new interpretation of photographic data of the cavitation process in an eccentric journal bearing gap. It stipulates a 3-D flow structure for transition from the Filled Fluid Film (FFF) to a cross-void fluid transportation process. The transition starts as a two-component composite rupture front and becomes an Adhered Film (AF) that is masked by rolled-on stream trails, which are drawn from the rupture front. The AF moves with the journal surface across the void to feed the FFF at the formation boundary. The rupture front comprises a first component of periodic streamers separated by a second component of interspersing wet pockets. Olsson’s Equation for flow continuity relative to a moving cavitation boundary (OEM) [1] yields a moving speed of the rupture front that is proportional to the reciprocal of the width fraction of the wet pockets multiplied into the FFF pressure gradient. Both rupture and formation boundaries move with finite speeds. The formation boundary speed in RST is determined by overall mass conservation in the bearing gap. RST formulation of the cavitation of a journal bearing fluid film yields an initial value time-dependent problem for the fluid flow in the bearing gap. The latter includes both the FFF and the AF that are joined at rupture and formation boundaries. The initial fluid content in the void span is bracketed between a dry void and a freshly cavitated wet void. As time progresses, transportation of AF across the void space and boundary motions form a coupled evolution process. Formulas for the boundary motions indicate that the formation boundary would become stationary simultaneously as the rupture boundary approaches the Swift-Stieber (SS) condition [2, 3]. Sample 1-D RST calculations illustrate temporal evolutions of the FFF pressure profiles, cavitation boundary locations and fluid content in the void span (AF profile). Resulting asymptotic pressure profiles are substantially different from published ECA calculations.
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Sedeh, Mahmoud Moeini, and J. M. Khodadadi. "Effect of Voids on Solidification of Phase Change Materials Infiltrated in Graphite Foams." In ASME 2012 Heat Transfer Summer Conference collocated with the ASME 2012 Fluids Engineering Division Summer Meeting and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ht2012-58405.
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As a fundamental process during production of composite thermal energy storage systems, infiltration of phase change materials (PCM) leads to formation of voids (air pockets) inside the pores of graphite foams. The presence of voids inside graphite cells (i.e. the presence of air pockets next to the conductive walls of the porous structure) markedly affects the thermal and phase change behavior of the composite. Therefore, it is vitally important to investigate the effect of voids on phase change behavior of latent heat energy storage composites. In complementing recent work devoted to modeling of the infiltration of PCM into graphite foams, a numerical approach was employed to study the solidification of PCM infiltrated into a graphite pore in the presence of a void. For this purpose, a two-dimensional model of the porous structure was developed based on the typical geometrical features of the pores. Grid independence study was performed on different unstructured grid systems. Since more than one fluid phase is present in this problem (PCM being the liquid phase and air pocket or void as the gas phase), the volume-of-fluid (VOF) method was utilized for investigation of solidification problem and tracking the interface. Considering various forces operating at the scale of the pore (i.e. 500 microns in diameter), this problem is under the influence of surface tension, gravity, and pressure gradient. The simulation was transient and continued until the entire liquid PCM inside the pore freezes. The volume of final void space will represent a combination of infiltration and shrinkage voids. Results of the simulation indicate the presence of 9.8% void (from the infiltration process) that can greatly alter the solidification rate of the PCM inside the pore. It is concluded that formation of shrinkage void during solidification can be predicted using this multi-phase model. For verification purposes, the volume of the predicted infiltration void was compared to reported experimental measurements and the volume of shrinkage void was compared to theoretical volume change. Good agreements were found in both cases.
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Padovan, Loris. "Design of an Innovative Moisture Separator Technology for Use in Nuclear Power Plants: Numerical Approach — Part 1." In 2020 International Conference on Nuclear Engineering collocated with the ASME 2020 Power Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icone2020-16193.
Full textAbstract:
Abstract The Moisture Separator Re-heater (MSR) is a key component of Nuclear Power Plants (NPP) both in terms of performance and avoiding erosion and erosion/corrosion damage. Wet steam is usually dried in a MSR by inertial separation using separator elements. Depending on the design of a MSR, the technology of separator elements contributes significantly to its size and performance, hence is seen as a subject for in-depth investigation, improvement and innovation. Computational Fluid Dynamics (CFD) has been used to understand the working principles of moisture separating devices, in particular the OpenFOAM platform has been utilized for this scope. Eulerian/Lagrangian models, wall-droplet interaction and water film formation models have been adopted to determine the physical phenomena occurring during the moisture separation process. Additional sub-models have been implemented to make a more robust solver and to solve in a comprehensive way all the possible physical processes: in particular a two-layers turbulence model and a film breakup model have been implemented. An out-of-the-box thinking approach was adopted to devise a new proposed chevron vane. Aerodynamic principles were used to design an innovative concept of separator panel, which can entrap the moisture droplets and water rivulets through a subsequent formation of recirculating steam representing artificial slots (hidden pockets) within the separator channel. The control of the steam separation on precise regions of the separator panel wall, helps the drainage of the water film without the utilization of physical obstacles (pockets or drainage channels). To validate the results achieved from the numerical simulation and to characterize separation performance of a new kind of separator technology, a bespoke test rig has been designed, built and put into operation at typical MSR operating conditions [1]. Throttling calorimeter methodology has been adopted to measure, with very good accuracy, the residual moisture content after the separator. The design developed has shown excellent separation performance. Particularly, this solution will allow improved MSR performance and significantly reduced MSR size. This represents an innovative technology which is a major advance on current technology available within the industry. The novel design features have been patented by General Electric. The first operation of a MSR with this technology is eagerly awaited.
Reports on the topic ""Tales from two pockets""
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Yablonskyy, Maxym. «NEW DAYS» WEEKLY AND PETRO VOLYNIAK, PUBLISHER AND AUTHOR. Ivan Franko National University of Lviv, 2021. http://dx.doi.org/10.30970/vjo.2021.49.11058.
Full textAbstract:
In the article on the material of the Salzburg weekly «New Days» (1945–1947) various spheres of activity of Peter Volyniak are presented. It is noted that this edition was a business card of the publishing house of the same name and had a history of continuation: in Toronto Petro Volyniak restored the publishing house of the same name and continued the publication in the format of the universal monthly «New Days» (1950–1969). The article also presents periodicals («Latest News», «New Days», «Timpani», «Our Way») and literary, artistic and scientific collection «Steering Wheel», which were published in the Salzburg publishing house of Peter Volyniak «New Days». The purpose of the publication is to trace the path of Petro Volyniak from a writer to a literary critic, journalist and publisher. This trend is reproduced in chronological order. Peter Volyniak as a writer is informed in the article «Literary Evening of P. Volyniak» (author – M. Ch-ka). O. Satsyuk’s literary-critical article is devoted to the coverage of ideological and artistic aspects of Petro Volyniak’s collection «The Earth Calls» (Salzburg, 1947). Petro Volyniak as a literary critic is presented in an article devoted to a collection of literary tales by A. Kolomiyets (Salzburg, 1946), which was published by «New Days». Petro Volyniak as a journalist presents the essay «This is our song…». With the help of content analysis it was observed that the text is divided into two parts: the first contains the author’s reflections on the Ukrainian song, its role in the life of the Ukrainian people; in the second, main, Peter Okopny’s activity abroad is presented. The publisher Petro Volyniak in 1947 in a separate publication of the February issue of the weekly summarizes the third year of activity, providing statistics on the publication of periodicals, books, postcards, calendars, various small format materials. The analyzed material demonstrated the experience of combining creative work and commercial activity.